Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/drivers/s390/block/dasd_eckd.c

  1 /*
  2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
  3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
  4  *                  Carsten Otte <Cotte@de.ibm.com>
  5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
  6  * Bugreports.to..: <Linux390@de.ibm.com>
  7  * Copyright IBM Corp. 1999, 2009
  8  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  9  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
 10  */
 11 
 12 #define KMSG_COMPONENT "dasd-eckd"
 13 
 14 #include <linux/stddef.h>
 15 #include <linux/kernel.h>
 16 #include <linux/slab.h>
 17 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
 18 #include <linux/bio.h>
 19 #include <linux/module.h>
 20 #include <linux/compat.h>
 21 #include <linux/init.h>
 22 #include <linux/seq_file.h>
 23 
 24 #include <asm/css_chars.h>
 25 #include <asm/debug.h>
 26 #include <asm/idals.h>
 27 #include <asm/ebcdic.h>
 28 #include <asm/io.h>
 29 #include <asm/uaccess.h>
 30 #include <asm/cio.h>
 31 #include <asm/ccwdev.h>
 32 #include <asm/itcw.h>
 33 #include <asm/schid.h>
 34 #include <asm/chpid.h>
 35 
 36 #include "dasd_int.h"
 37 #include "dasd_eckd.h"
 38 
 39 #ifdef PRINTK_HEADER
 40 #undef PRINTK_HEADER
 41 #endif                          /* PRINTK_HEADER */
 42 #define PRINTK_HEADER "dasd(eckd):"
 43 
 44 #define ECKD_C0(i) (i->home_bytes)
 45 #define ECKD_F(i) (i->formula)
 46 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
 47                     (i->factors.f_0x02.f1))
 48 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
 49                     (i->factors.f_0x02.f2))
 50 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
 51                     (i->factors.f_0x02.f3))
 52 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
 53 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
 54 #define ECKD_F6(i) (i->factor6)
 55 #define ECKD_F7(i) (i->factor7)
 56 #define ECKD_F8(i) (i->factor8)
 57 
 58 /*
 59  * raw track access always map to 64k in memory
 60  * so it maps to 16 blocks of 4k per track
 61  */
 62 #define DASD_RAW_BLOCK_PER_TRACK 16
 63 #define DASD_RAW_BLOCKSIZE 4096
 64 /* 64k are 128 x 512 byte sectors  */
 65 #define DASD_RAW_SECTORS_PER_TRACK 128
 66 
 67 MODULE_LICENSE("GPL");
 68 
 69 static struct dasd_discipline dasd_eckd_discipline;
 70 
 71 /* The ccw bus type uses this table to find devices that it sends to
 72  * dasd_eckd_probe */
 73 static struct ccw_device_id dasd_eckd_ids[] = {
 74         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
 75         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
 76         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
 77         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
 78         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
 79         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
 80         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
 81         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
 82         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
 83         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
 84         { /* end of list */ },
 85 };
 86 
 87 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
 88 
 89 static struct ccw_driver dasd_eckd_driver; /* see below */
 90 
 91 static void *rawpadpage;
 92 
 93 #define INIT_CQR_OK 0
 94 #define INIT_CQR_UNFORMATTED 1
 95 #define INIT_CQR_ERROR 2
 96 
 97 /* emergency request for reserve/release */
 98 static struct {
 99         struct dasd_ccw_req cqr;
100         struct ccw1 ccw;
101         char data[32];
102 } *dasd_reserve_req;
103 static DEFINE_MUTEX(dasd_reserve_mutex);
104 
105 /* definitions for the path verification worker */
106 struct path_verification_work_data {
107         struct work_struct worker;
108         struct dasd_device *device;
109         struct dasd_ccw_req cqr;
110         struct ccw1 ccw;
111         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
112         int isglobal;
113         __u8 tbvpm;
114 };
115 static struct path_verification_work_data *path_verification_worker;
116 static DEFINE_MUTEX(dasd_path_verification_mutex);
117 
118 struct check_attention_work_data {
119         struct work_struct worker;
120         struct dasd_device *device;
121         __u8 lpum;
122 };
123 
124 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
125                         struct dasd_device *, struct dasd_device *,
126                         unsigned int, int, unsigned int, unsigned int,
127                         unsigned int, unsigned int);
128 
129 /* initial attempt at a probe function. this can be simplified once
130  * the other detection code is gone */
131 static int
132 dasd_eckd_probe (struct ccw_device *cdev)
133 {
134         int ret;
135 
136         /* set ECKD specific ccw-device options */
137         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
138                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
139         if (ret) {
140                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
141                                 "dasd_eckd_probe: could not set "
142                                 "ccw-device options");
143                 return ret;
144         }
145         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
146         return ret;
147 }
148 
149 static int
150 dasd_eckd_set_online(struct ccw_device *cdev)
151 {
152         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
153 }
154 
155 static const int sizes_trk0[] = { 28, 148, 84 };
156 #define LABEL_SIZE 140
157 
158 /* head and record addresses of count_area read in analysis ccw */
159 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
160 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
161 
162 static inline unsigned int
163 round_up_multiple(unsigned int no, unsigned int mult)
164 {
165         int rem = no % mult;
166         return (rem ? no - rem + mult : no);
167 }
168 
169 static inline unsigned int
170 ceil_quot(unsigned int d1, unsigned int d2)
171 {
172         return (d1 + (d2 - 1)) / d2;
173 }
174 
175 static unsigned int
176 recs_per_track(struct dasd_eckd_characteristics * rdc,
177                unsigned int kl, unsigned int dl)
178 {
179         int dn, kn;
180 
181         switch (rdc->dev_type) {
182         case 0x3380:
183                 if (kl)
184                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
185                                        ceil_quot(dl + 12, 32));
186                 else
187                         return 1499 / (15 + ceil_quot(dl + 12, 32));
188         case 0x3390:
189                 dn = ceil_quot(dl + 6, 232) + 1;
190                 if (kl) {
191                         kn = ceil_quot(kl + 6, 232) + 1;
192                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
193                                        9 + ceil_quot(dl + 6 * dn, 34));
194                 } else
195                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
196         case 0x9345:
197                 dn = ceil_quot(dl + 6, 232) + 1;
198                 if (kl) {
199                         kn = ceil_quot(kl + 6, 232) + 1;
200                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
201                                        ceil_quot(dl + 6 * dn, 34));
202                 } else
203                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
204         }
205         return 0;
206 }
207 
208 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
209 {
210         geo->cyl = (__u16) cyl;
211         geo->head = cyl >> 16;
212         geo->head <<= 4;
213         geo->head |= head;
214 }
215 
216 static int
217 check_XRC (struct ccw1         *de_ccw,
218            struct DE_eckd_data *data,
219            struct dasd_device  *device)
220 {
221         struct dasd_eckd_private *private = device->private;
222         int rc;
223 
224         if (!private->rdc_data.facilities.XRC_supported)
225                 return 0;
226 
227         /* switch on System Time Stamp - needed for XRC Support */
228         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
229         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
230 
231         rc = get_phys_clock(&data->ep_sys_time);
232         /* Ignore return code if sync clock is switched off. */
233         if (rc == -EOPNOTSUPP || rc == -EACCES)
234                 rc = 0;
235 
236         de_ccw->count = sizeof(struct DE_eckd_data);
237         de_ccw->flags |= CCW_FLAG_SLI;
238         return rc;
239 }
240 
241 static int
242 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
243               unsigned int totrk, int cmd, struct dasd_device *device)
244 {
245         struct dasd_eckd_private *private = device->private;
246         u32 begcyl, endcyl;
247         u16 heads, beghead, endhead;
248         int rc = 0;
249 
250         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
251         ccw->flags = 0;
252         ccw->count = 16;
253         ccw->cda = (__u32) __pa(data);
254 
255         memset(data, 0, sizeof(struct DE_eckd_data));
256         switch (cmd) {
257         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
258         case DASD_ECKD_CCW_READ_RECORD_ZERO:
259         case DASD_ECKD_CCW_READ:
260         case DASD_ECKD_CCW_READ_MT:
261         case DASD_ECKD_CCW_READ_CKD:
262         case DASD_ECKD_CCW_READ_CKD_MT:
263         case DASD_ECKD_CCW_READ_KD:
264         case DASD_ECKD_CCW_READ_KD_MT:
265                 data->mask.perm = 0x1;
266                 data->attributes.operation = private->attrib.operation;
267                 break;
268         case DASD_ECKD_CCW_READ_COUNT:
269                 data->mask.perm = 0x1;
270                 data->attributes.operation = DASD_BYPASS_CACHE;
271                 break;
272         case DASD_ECKD_CCW_WRITE:
273         case DASD_ECKD_CCW_WRITE_MT:
274         case DASD_ECKD_CCW_WRITE_KD:
275         case DASD_ECKD_CCW_WRITE_KD_MT:
276                 data->mask.perm = 0x02;
277                 data->attributes.operation = private->attrib.operation;
278                 rc = check_XRC (ccw, data, device);
279                 break;
280         case DASD_ECKD_CCW_WRITE_CKD:
281         case DASD_ECKD_CCW_WRITE_CKD_MT:
282                 data->attributes.operation = DASD_BYPASS_CACHE;
283                 rc = check_XRC (ccw, data, device);
284                 break;
285         case DASD_ECKD_CCW_ERASE:
286         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
287         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
288                 data->mask.perm = 0x3;
289                 data->mask.auth = 0x1;
290                 data->attributes.operation = DASD_BYPASS_CACHE;
291                 rc = check_XRC (ccw, data, device);
292                 break;
293         default:
294                 dev_err(&device->cdev->dev,
295                         "0x%x is not a known command\n", cmd);
296                 break;
297         }
298 
299         data->attributes.mode = 0x3;    /* ECKD */
300 
301         if ((private->rdc_data.cu_type == 0x2105 ||
302              private->rdc_data.cu_type == 0x2107 ||
303              private->rdc_data.cu_type == 0x1750)
304             && !(private->uses_cdl && trk < 2))
305                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
306 
307         heads = private->rdc_data.trk_per_cyl;
308         begcyl = trk / heads;
309         beghead = trk % heads;
310         endcyl = totrk / heads;
311         endhead = totrk % heads;
312 
313         /* check for sequential prestage - enhance cylinder range */
314         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
315             data->attributes.operation == DASD_SEQ_ACCESS) {
316 
317                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
318                         endcyl += private->attrib.nr_cyl;
319                 else
320                         endcyl = (private->real_cyl - 1);
321         }
322 
323         set_ch_t(&data->beg_ext, begcyl, beghead);
324         set_ch_t(&data->end_ext, endcyl, endhead);
325         return rc;
326 }
327 
328 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
329                                struct dasd_device  *device)
330 {
331         struct dasd_eckd_private *private = device->private;
332         int rc;
333 
334         if (!private->rdc_data.facilities.XRC_supported)
335                 return 0;
336 
337         /* switch on System Time Stamp - needed for XRC Support */
338         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
339         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
340         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
341 
342         rc = get_phys_clock(&pfxdata->define_extent.ep_sys_time);
343         /* Ignore return code if sync clock is switched off. */
344         if (rc == -EOPNOTSUPP || rc == -EACCES)
345                 rc = 0;
346         return rc;
347 }
348 
349 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
350                           unsigned int rec_on_trk, int count, int cmd,
351                           struct dasd_device *device, unsigned int reclen,
352                           unsigned int tlf)
353 {
354         struct dasd_eckd_private *private = device->private;
355         int sector;
356         int dn, d;
357 
358         memset(data, 0, sizeof(*data));
359         sector = 0;
360         if (rec_on_trk) {
361                 switch (private->rdc_data.dev_type) {
362                 case 0x3390:
363                         dn = ceil_quot(reclen + 6, 232);
364                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
365                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
366                         break;
367                 case 0x3380:
368                         d = 7 + ceil_quot(reclen + 12, 32);
369                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
370                         break;
371                 }
372         }
373         data->sector = sector;
374         /* note: meaning of count depends on the operation
375          *       for record based I/O it's the number of records, but for
376          *       track based I/O it's the number of tracks
377          */
378         data->count = count;
379         switch (cmd) {
380         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
381                 data->operation.orientation = 0x3;
382                 data->operation.operation = 0x03;
383                 break;
384         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
385                 data->operation.orientation = 0x3;
386                 data->operation.operation = 0x16;
387                 break;
388         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
389                 data->operation.orientation = 0x1;
390                 data->operation.operation = 0x03;
391                 data->count++;
392                 break;
393         case DASD_ECKD_CCW_READ_RECORD_ZERO:
394                 data->operation.orientation = 0x3;
395                 data->operation.operation = 0x16;
396                 data->count++;
397                 break;
398         case DASD_ECKD_CCW_WRITE:
399         case DASD_ECKD_CCW_WRITE_MT:
400         case DASD_ECKD_CCW_WRITE_KD:
401         case DASD_ECKD_CCW_WRITE_KD_MT:
402                 data->auxiliary.length_valid = 0x1;
403                 data->length = reclen;
404                 data->operation.operation = 0x01;
405                 break;
406         case DASD_ECKD_CCW_WRITE_CKD:
407         case DASD_ECKD_CCW_WRITE_CKD_MT:
408                 data->auxiliary.length_valid = 0x1;
409                 data->length = reclen;
410                 data->operation.operation = 0x03;
411                 break;
412         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
413                 data->operation.orientation = 0x0;
414                 data->operation.operation = 0x3F;
415                 data->extended_operation = 0x11;
416                 data->length = 0;
417                 data->extended_parameter_length = 0x02;
418                 if (data->count > 8) {
419                         data->extended_parameter[0] = 0xFF;
420                         data->extended_parameter[1] = 0xFF;
421                         data->extended_parameter[1] <<= (16 - count);
422                 } else {
423                         data->extended_parameter[0] = 0xFF;
424                         data->extended_parameter[0] <<= (8 - count);
425                         data->extended_parameter[1] = 0x00;
426                 }
427                 data->sector = 0xFF;
428                 break;
429         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
430                 data->auxiliary.length_valid = 0x1;
431                 data->length = reclen;  /* not tlf, as one might think */
432                 data->operation.operation = 0x3F;
433                 data->extended_operation = 0x23;
434                 break;
435         case DASD_ECKD_CCW_READ:
436         case DASD_ECKD_CCW_READ_MT:
437         case DASD_ECKD_CCW_READ_KD:
438         case DASD_ECKD_CCW_READ_KD_MT:
439                 data->auxiliary.length_valid = 0x1;
440                 data->length = reclen;
441                 data->operation.operation = 0x06;
442                 break;
443         case DASD_ECKD_CCW_READ_CKD:
444         case DASD_ECKD_CCW_READ_CKD_MT:
445                 data->auxiliary.length_valid = 0x1;
446                 data->length = reclen;
447                 data->operation.operation = 0x16;
448                 break;
449         case DASD_ECKD_CCW_READ_COUNT:
450                 data->operation.operation = 0x06;
451                 break;
452         case DASD_ECKD_CCW_READ_TRACK:
453                 data->operation.orientation = 0x1;
454                 data->operation.operation = 0x0C;
455                 data->extended_parameter_length = 0;
456                 data->sector = 0xFF;
457                 break;
458         case DASD_ECKD_CCW_READ_TRACK_DATA:
459                 data->auxiliary.length_valid = 0x1;
460                 data->length = tlf;
461                 data->operation.operation = 0x0C;
462                 break;
463         case DASD_ECKD_CCW_ERASE:
464                 data->length = reclen;
465                 data->auxiliary.length_valid = 0x1;
466                 data->operation.operation = 0x0b;
467                 break;
468         default:
469                 DBF_DEV_EVENT(DBF_ERR, device,
470                             "fill LRE unknown opcode 0x%x", cmd);
471                 BUG();
472         }
473         set_ch_t(&data->seek_addr,
474                  trk / private->rdc_data.trk_per_cyl,
475                  trk % private->rdc_data.trk_per_cyl);
476         data->search_arg.cyl = data->seek_addr.cyl;
477         data->search_arg.head = data->seek_addr.head;
478         data->search_arg.record = rec_on_trk;
479 }
480 
481 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
482                       unsigned int trk, unsigned int totrk, int cmd,
483                       struct dasd_device *basedev, struct dasd_device *startdev,
484                       unsigned char format, unsigned int rec_on_trk, int count,
485                       unsigned int blksize, unsigned int tlf)
486 {
487         struct dasd_eckd_private *basepriv, *startpriv;
488         struct DE_eckd_data *dedata;
489         struct LRE_eckd_data *lredata;
490         u32 begcyl, endcyl;
491         u16 heads, beghead, endhead;
492         int rc = 0;
493 
494         basepriv = basedev->private;
495         startpriv = startdev->private;
496         dedata = &pfxdata->define_extent;
497         lredata = &pfxdata->locate_record;
498 
499         ccw->cmd_code = DASD_ECKD_CCW_PFX;
500         ccw->flags = 0;
501         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
502                 ccw->count = sizeof(*pfxdata) + 2;
503                 ccw->cda = (__u32) __pa(pfxdata);
504                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
505         } else {
506                 ccw->count = sizeof(*pfxdata);
507                 ccw->cda = (__u32) __pa(pfxdata);
508                 memset(pfxdata, 0, sizeof(*pfxdata));
509         }
510 
511         /* prefix data */
512         if (format > 1) {
513                 DBF_DEV_EVENT(DBF_ERR, basedev,
514                               "PFX LRE unknown format 0x%x", format);
515                 BUG();
516                 return -EINVAL;
517         }
518         pfxdata->format = format;
519         pfxdata->base_address = basepriv->ned->unit_addr;
520         pfxdata->base_lss = basepriv->ned->ID;
521         pfxdata->validity.define_extent = 1;
522 
523         /* private uid is kept up to date, conf_data may be outdated */
524         if (startpriv->uid.type != UA_BASE_DEVICE) {
525                 pfxdata->validity.verify_base = 1;
526                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
527                         pfxdata->validity.hyper_pav = 1;
528         }
529 
530         /* define extend data (mostly)*/
531         switch (cmd) {
532         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
533         case DASD_ECKD_CCW_READ_RECORD_ZERO:
534         case DASD_ECKD_CCW_READ:
535         case DASD_ECKD_CCW_READ_MT:
536         case DASD_ECKD_CCW_READ_CKD:
537         case DASD_ECKD_CCW_READ_CKD_MT:
538         case DASD_ECKD_CCW_READ_KD:
539         case DASD_ECKD_CCW_READ_KD_MT:
540                 dedata->mask.perm = 0x1;
541                 dedata->attributes.operation = basepriv->attrib.operation;
542                 break;
543         case DASD_ECKD_CCW_READ_COUNT:
544                 dedata->mask.perm = 0x1;
545                 dedata->attributes.operation = DASD_BYPASS_CACHE;
546                 break;
547         case DASD_ECKD_CCW_READ_TRACK:
548         case DASD_ECKD_CCW_READ_TRACK_DATA:
549                 dedata->mask.perm = 0x1;
550                 dedata->attributes.operation = basepriv->attrib.operation;
551                 dedata->blk_size = 0;
552                 break;
553         case DASD_ECKD_CCW_WRITE:
554         case DASD_ECKD_CCW_WRITE_MT:
555         case DASD_ECKD_CCW_WRITE_KD:
556         case DASD_ECKD_CCW_WRITE_KD_MT:
557                 dedata->mask.perm = 0x02;
558                 dedata->attributes.operation = basepriv->attrib.operation;
559                 rc = check_XRC_on_prefix(pfxdata, basedev);
560                 break;
561         case DASD_ECKD_CCW_WRITE_CKD:
562         case DASD_ECKD_CCW_WRITE_CKD_MT:
563                 dedata->attributes.operation = DASD_BYPASS_CACHE;
564                 rc = check_XRC_on_prefix(pfxdata, basedev);
565                 break;
566         case DASD_ECKD_CCW_ERASE:
567         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
568         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
569                 dedata->mask.perm = 0x3;
570                 dedata->mask.auth = 0x1;
571                 dedata->attributes.operation = DASD_BYPASS_CACHE;
572                 rc = check_XRC_on_prefix(pfxdata, basedev);
573                 break;
574         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
575                 dedata->mask.perm = 0x03;
576                 dedata->attributes.operation = basepriv->attrib.operation;
577                 dedata->blk_size = 0;
578                 break;
579         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
580                 dedata->mask.perm = 0x02;
581                 dedata->attributes.operation = basepriv->attrib.operation;
582                 dedata->blk_size = blksize;
583                 rc = check_XRC_on_prefix(pfxdata, basedev);
584                 break;
585         default:
586                 DBF_DEV_EVENT(DBF_ERR, basedev,
587                             "PFX LRE unknown opcode 0x%x", cmd);
588                 BUG();
589                 return -EINVAL;
590         }
591 
592         dedata->attributes.mode = 0x3;  /* ECKD */
593 
594         if ((basepriv->rdc_data.cu_type == 0x2105 ||
595              basepriv->rdc_data.cu_type == 0x2107 ||
596              basepriv->rdc_data.cu_type == 0x1750)
597             && !(basepriv->uses_cdl && trk < 2))
598                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
599 
600         heads = basepriv->rdc_data.trk_per_cyl;
601         begcyl = trk / heads;
602         beghead = trk % heads;
603         endcyl = totrk / heads;
604         endhead = totrk % heads;
605 
606         /* check for sequential prestage - enhance cylinder range */
607         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
608             dedata->attributes.operation == DASD_SEQ_ACCESS) {
609 
610                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
611                         endcyl += basepriv->attrib.nr_cyl;
612                 else
613                         endcyl = (basepriv->real_cyl - 1);
614         }
615 
616         set_ch_t(&dedata->beg_ext, begcyl, beghead);
617         set_ch_t(&dedata->end_ext, endcyl, endhead);
618 
619         if (format == 1) {
620                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
621                               basedev, blksize, tlf);
622         }
623 
624         return rc;
625 }
626 
627 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
628                   unsigned int trk, unsigned int totrk, int cmd,
629                   struct dasd_device *basedev, struct dasd_device *startdev)
630 {
631         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
632                           0, 0, 0, 0, 0);
633 }
634 
635 static void
636 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
637               unsigned int rec_on_trk, int no_rec, int cmd,
638               struct dasd_device * device, int reclen)
639 {
640         struct dasd_eckd_private *private = device->private;
641         int sector;
642         int dn, d;
643 
644         DBF_DEV_EVENT(DBF_INFO, device,
645                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
646                   trk, rec_on_trk, no_rec, cmd, reclen);
647 
648         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
649         ccw->flags = 0;
650         ccw->count = 16;
651         ccw->cda = (__u32) __pa(data);
652 
653         memset(data, 0, sizeof(struct LO_eckd_data));
654         sector = 0;
655         if (rec_on_trk) {
656                 switch (private->rdc_data.dev_type) {
657                 case 0x3390:
658                         dn = ceil_quot(reclen + 6, 232);
659                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
660                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
661                         break;
662                 case 0x3380:
663                         d = 7 + ceil_quot(reclen + 12, 32);
664                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
665                         break;
666                 }
667         }
668         data->sector = sector;
669         data->count = no_rec;
670         switch (cmd) {
671         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
672                 data->operation.orientation = 0x3;
673                 data->operation.operation = 0x03;
674                 break;
675         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
676                 data->operation.orientation = 0x3;
677                 data->operation.operation = 0x16;
678                 break;
679         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
680                 data->operation.orientation = 0x1;
681                 data->operation.operation = 0x03;
682                 data->count++;
683                 break;
684         case DASD_ECKD_CCW_READ_RECORD_ZERO:
685                 data->operation.orientation = 0x3;
686                 data->operation.operation = 0x16;
687                 data->count++;
688                 break;
689         case DASD_ECKD_CCW_WRITE:
690         case DASD_ECKD_CCW_WRITE_MT:
691         case DASD_ECKD_CCW_WRITE_KD:
692         case DASD_ECKD_CCW_WRITE_KD_MT:
693                 data->auxiliary.last_bytes_used = 0x1;
694                 data->length = reclen;
695                 data->operation.operation = 0x01;
696                 break;
697         case DASD_ECKD_CCW_WRITE_CKD:
698         case DASD_ECKD_CCW_WRITE_CKD_MT:
699                 data->auxiliary.last_bytes_used = 0x1;
700                 data->length = reclen;
701                 data->operation.operation = 0x03;
702                 break;
703         case DASD_ECKD_CCW_READ:
704         case DASD_ECKD_CCW_READ_MT:
705         case DASD_ECKD_CCW_READ_KD:
706         case DASD_ECKD_CCW_READ_KD_MT:
707                 data->auxiliary.last_bytes_used = 0x1;
708                 data->length = reclen;
709                 data->operation.operation = 0x06;
710                 break;
711         case DASD_ECKD_CCW_READ_CKD:
712         case DASD_ECKD_CCW_READ_CKD_MT:
713                 data->auxiliary.last_bytes_used = 0x1;
714                 data->length = reclen;
715                 data->operation.operation = 0x16;
716                 break;
717         case DASD_ECKD_CCW_READ_COUNT:
718                 data->operation.operation = 0x06;
719                 break;
720         case DASD_ECKD_CCW_ERASE:
721                 data->length = reclen;
722                 data->auxiliary.last_bytes_used = 0x1;
723                 data->operation.operation = 0x0b;
724                 break;
725         default:
726                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
727                               "opcode 0x%x", cmd);
728         }
729         set_ch_t(&data->seek_addr,
730                  trk / private->rdc_data.trk_per_cyl,
731                  trk % private->rdc_data.trk_per_cyl);
732         data->search_arg.cyl = data->seek_addr.cyl;
733         data->search_arg.head = data->seek_addr.head;
734         data->search_arg.record = rec_on_trk;
735 }
736 
737 /*
738  * Returns 1 if the block is one of the special blocks that needs
739  * to get read/written with the KD variant of the command.
740  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
741  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
742  * Luckily the KD variants differ only by one bit (0x08) from the
743  * normal variant. So don't wonder about code like:
744  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
745  *         ccw->cmd_code |= 0x8;
746  */
747 static inline int
748 dasd_eckd_cdl_special(int blk_per_trk, int recid)
749 {
750         if (recid < 3)
751                 return 1;
752         if (recid < blk_per_trk)
753                 return 0;
754         if (recid < 2 * blk_per_trk)
755                 return 1;
756         return 0;
757 }
758 
759 /*
760  * Returns the record size for the special blocks of the cdl format.
761  * Only returns something useful if dasd_eckd_cdl_special is true
762  * for the recid.
763  */
764 static inline int
765 dasd_eckd_cdl_reclen(int recid)
766 {
767         if (recid < 3)
768                 return sizes_trk0[recid];
769         return LABEL_SIZE;
770 }
771 /* create unique id from private structure. */
772 static void create_uid(struct dasd_eckd_private *private)
773 {
774         int count;
775         struct dasd_uid *uid;
776 
777         uid = &private->uid;
778         memset(uid, 0, sizeof(struct dasd_uid));
779         memcpy(uid->vendor, private->ned->HDA_manufacturer,
780                sizeof(uid->vendor) - 1);
781         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
782         memcpy(uid->serial, private->ned->HDA_location,
783                sizeof(uid->serial) - 1);
784         EBCASC(uid->serial, sizeof(uid->serial) - 1);
785         uid->ssid = private->gneq->subsystemID;
786         uid->real_unit_addr = private->ned->unit_addr;
787         if (private->sneq) {
788                 uid->type = private->sneq->sua_flags;
789                 if (uid->type == UA_BASE_PAV_ALIAS)
790                         uid->base_unit_addr = private->sneq->base_unit_addr;
791         } else {
792                 uid->type = UA_BASE_DEVICE;
793         }
794         if (private->vdsneq) {
795                 for (count = 0; count < 16; count++) {
796                         sprintf(uid->vduit+2*count, "%02x",
797                                 private->vdsneq->uit[count]);
798                 }
799         }
800 }
801 
802 /*
803  * Generate device unique id that specifies the physical device.
804  */
805 static int dasd_eckd_generate_uid(struct dasd_device *device)
806 {
807         struct dasd_eckd_private *private = device->private;
808         unsigned long flags;
809 
810         if (!private)
811                 return -ENODEV;
812         if (!private->ned || !private->gneq)
813                 return -ENODEV;
814         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
815         create_uid(private);
816         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
817         return 0;
818 }
819 
820 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
821 {
822         struct dasd_eckd_private *private = device->private;
823         unsigned long flags;
824 
825         if (private) {
826                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
827                 *uid = private->uid;
828                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
829                 return 0;
830         }
831         return -EINVAL;
832 }
833 
834 /*
835  * compare device UID with data of a given dasd_eckd_private structure
836  * return 0 for match
837  */
838 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
839                                       struct dasd_eckd_private *private)
840 {
841         struct dasd_uid device_uid;
842 
843         create_uid(private);
844         dasd_eckd_get_uid(device, &device_uid);
845 
846         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
847 }
848 
849 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
850                                    struct dasd_ccw_req *cqr,
851                                    __u8 *rcd_buffer,
852                                    __u8 lpm)
853 {
854         struct ccw1 *ccw;
855         /*
856          * buffer has to start with EBCDIC "V1.0" to show
857          * support for virtual device SNEQ
858          */
859         rcd_buffer[0] = 0xE5;
860         rcd_buffer[1] = 0xF1;
861         rcd_buffer[2] = 0x4B;
862         rcd_buffer[3] = 0xF0;
863 
864         ccw = cqr->cpaddr;
865         ccw->cmd_code = DASD_ECKD_CCW_RCD;
866         ccw->flags = 0;
867         ccw->cda = (__u32)(addr_t)rcd_buffer;
868         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
869         cqr->magic = DASD_ECKD_MAGIC;
870 
871         cqr->startdev = device;
872         cqr->memdev = device;
873         cqr->block = NULL;
874         cqr->expires = 10*HZ;
875         cqr->lpm = lpm;
876         cqr->retries = 256;
877         cqr->buildclk = get_tod_clock();
878         cqr->status = DASD_CQR_FILLED;
879         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
880 }
881 
882 /*
883  * Wakeup helper for read_conf
884  * if the cqr is not done and needs some error recovery
885  * the buffer has to be re-initialized with the EBCDIC "V1.0"
886  * to show support for virtual device SNEQ
887  */
888 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
889 {
890         struct ccw1 *ccw;
891         __u8 *rcd_buffer;
892 
893         if (cqr->status !=  DASD_CQR_DONE) {
894                 ccw = cqr->cpaddr;
895                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
896                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
897 
898                 rcd_buffer[0] = 0xE5;
899                 rcd_buffer[1] = 0xF1;
900                 rcd_buffer[2] = 0x4B;
901                 rcd_buffer[3] = 0xF0;
902         }
903         dasd_wakeup_cb(cqr, data);
904 }
905 
906 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
907                                            struct dasd_ccw_req *cqr,
908                                            __u8 *rcd_buffer,
909                                            __u8 lpm)
910 {
911         struct ciw *ciw;
912         int rc;
913         /*
914          * sanity check: scan for RCD command in extended SenseID data
915          * some devices do not support RCD
916          */
917         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
918         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
919                 return -EOPNOTSUPP;
920 
921         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
922         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
923         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
924         cqr->retries = 5;
925         cqr->callback = read_conf_cb;
926         rc = dasd_sleep_on_immediatly(cqr);
927         return rc;
928 }
929 
930 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
931                                    void **rcd_buffer,
932                                    int *rcd_buffer_size, __u8 lpm)
933 {
934         struct ciw *ciw;
935         char *rcd_buf = NULL;
936         int ret;
937         struct dasd_ccw_req *cqr;
938 
939         /*
940          * sanity check: scan for RCD command in extended SenseID data
941          * some devices do not support RCD
942          */
943         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
944         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
945                 ret = -EOPNOTSUPP;
946                 goto out_error;
947         }
948         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
949         if (!rcd_buf) {
950                 ret = -ENOMEM;
951                 goto out_error;
952         }
953         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
954                                    0, /* use rcd_buf as data ara */
955                                    device);
956         if (IS_ERR(cqr)) {
957                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
958                               "Could not allocate RCD request");
959                 ret = -ENOMEM;
960                 goto out_error;
961         }
962         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
963         cqr->callback = read_conf_cb;
964         ret = dasd_sleep_on(cqr);
965         /*
966          * on success we update the user input parms
967          */
968         dasd_sfree_request(cqr, cqr->memdev);
969         if (ret)
970                 goto out_error;
971 
972         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
973         *rcd_buffer = rcd_buf;
974         return 0;
975 out_error:
976         kfree(rcd_buf);
977         *rcd_buffer = NULL;
978         *rcd_buffer_size = 0;
979         return ret;
980 }
981 
982 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
983 {
984 
985         struct dasd_sneq *sneq;
986         int i, count;
987 
988         private->ned = NULL;
989         private->sneq = NULL;
990         private->vdsneq = NULL;
991         private->gneq = NULL;
992         count = private->conf_len / sizeof(struct dasd_sneq);
993         sneq = (struct dasd_sneq *)private->conf_data;
994         for (i = 0; i < count; ++i) {
995                 if (sneq->flags.identifier == 1 && sneq->format == 1)
996                         private->sneq = sneq;
997                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
998                         private->vdsneq = (struct vd_sneq *)sneq;
999                 else if (sneq->flags.identifier == 2)
1000                         private->gneq = (struct dasd_gneq *)sneq;
1001                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
1002                         private->ned = (struct dasd_ned *)sneq;
1003                 sneq++;
1004         }
1005         if (!private->ned || !private->gneq) {
1006                 private->ned = NULL;
1007                 private->sneq = NULL;
1008                 private->vdsneq = NULL;
1009                 private->gneq = NULL;
1010                 return -EINVAL;
1011         }
1012         return 0;
1013 
1014 };
1015 
1016 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1017 {
1018         struct dasd_gneq *gneq;
1019         int i, count, found;
1020 
1021         count = conf_len / sizeof(*gneq);
1022         gneq = (struct dasd_gneq *)conf_data;
1023         found = 0;
1024         for (i = 0; i < count; ++i) {
1025                 if (gneq->flags.identifier == 2) {
1026                         found = 1;
1027                         break;
1028                 }
1029                 gneq++;
1030         }
1031         if (found)
1032                 return ((char *)gneq)[18] & 0x07;
1033         else
1034                 return 0;
1035 }
1036 
1037 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1038 {
1039         struct dasd_eckd_private *private = device->private;
1040         int i;
1041 
1042         private->conf_data = NULL;
1043         private->conf_len = 0;
1044         for (i = 0; i < 8; i++) {
1045                 kfree(private->path_conf_data[i]);
1046                 private->path_conf_data[i] = NULL;
1047         }
1048 }
1049 
1050 
1051 static int dasd_eckd_read_conf(struct dasd_device *device)
1052 {
1053         void *conf_data;
1054         int conf_len, conf_data_saved;
1055         int rc, path_err, pos;
1056         __u8 lpm, opm;
1057         struct dasd_eckd_private *private, path_private;
1058         struct dasd_path *path_data;
1059         struct dasd_uid *uid;
1060         char print_path_uid[60], print_device_uid[60];
1061 
1062         private = device->private;
1063         path_data = &device->path_data;
1064         opm = ccw_device_get_path_mask(device->cdev);
1065         conf_data_saved = 0;
1066         path_err = 0;
1067         /* get configuration data per operational path */
1068         for (lpm = 0x80; lpm; lpm>>= 1) {
1069                 if (!(lpm & opm))
1070                         continue;
1071                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1072                                              &conf_len, lpm);
1073                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1074                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1075                                         "Read configuration data returned "
1076                                         "error %d", rc);
1077                         return rc;
1078                 }
1079                 if (conf_data == NULL) {
1080                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1081                                         "No configuration data "
1082                                         "retrieved");
1083                         /* no further analysis possible */
1084                         path_data->opm |= lpm;
1085                         continue;       /* no error */
1086                 }
1087                 /* save first valid configuration data */
1088                 if (!conf_data_saved) {
1089                         /* initially clear previously stored conf_data */
1090                         dasd_eckd_clear_conf_data(device);
1091                         private->conf_data = conf_data;
1092                         private->conf_len = conf_len;
1093                         if (dasd_eckd_identify_conf_parts(private)) {
1094                                 private->conf_data = NULL;
1095                                 private->conf_len = 0;
1096                                 kfree(conf_data);
1097                                 continue;
1098                         }
1099                         pos = pathmask_to_pos(lpm);
1100                         /* store per path conf_data */
1101                         private->path_conf_data[pos] =
1102                                 (struct dasd_conf_data *) conf_data;
1103                         /*
1104                          * build device UID that other path data
1105                          * can be compared to it
1106                          */
1107                         dasd_eckd_generate_uid(device);
1108                         conf_data_saved++;
1109                 } else {
1110                         path_private.conf_data = conf_data;
1111                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1112                         if (dasd_eckd_identify_conf_parts(
1113                                     &path_private)) {
1114                                 path_private.conf_data = NULL;
1115                                 path_private.conf_len = 0;
1116                                 kfree(conf_data);
1117                                 continue;
1118                         }
1119                         if (dasd_eckd_compare_path_uid(
1120                                     device, &path_private)) {
1121                                 uid = &path_private.uid;
1122                                 if (strlen(uid->vduit) > 0)
1123                                         snprintf(print_path_uid,
1124                                                  sizeof(print_path_uid),
1125                                                  "%s.%s.%04x.%02x.%s",
1126                                                  uid->vendor, uid->serial,
1127                                                  uid->ssid, uid->real_unit_addr,
1128                                                  uid->vduit);
1129                                 else
1130                                         snprintf(print_path_uid,
1131                                                  sizeof(print_path_uid),
1132                                                  "%s.%s.%04x.%02x",
1133                                                  uid->vendor, uid->serial,
1134                                                  uid->ssid,
1135                                                  uid->real_unit_addr);
1136                                 uid = &private->uid;
1137                                 if (strlen(uid->vduit) > 0)
1138                                         snprintf(print_device_uid,
1139                                                  sizeof(print_device_uid),
1140                                                  "%s.%s.%04x.%02x.%s",
1141                                                  uid->vendor, uid->serial,
1142                                                  uid->ssid, uid->real_unit_addr,
1143                                                  uid->vduit);
1144                                 else
1145                                         snprintf(print_device_uid,
1146                                                  sizeof(print_device_uid),
1147                                                  "%s.%s.%04x.%02x",
1148                                                  uid->vendor, uid->serial,
1149                                                  uid->ssid,
1150                                                  uid->real_unit_addr);
1151                                 dev_err(&device->cdev->dev,
1152                                         "Not all channel paths lead to "
1153                                         "the same device, path %02X leads to "
1154                                         "device %s instead of %s\n", lpm,
1155                                         print_path_uid, print_device_uid);
1156                                 path_err = -EINVAL;
1157                                 path_data->cablepm |= lpm;
1158                                 continue;
1159                         }
1160                         pos = pathmask_to_pos(lpm);
1161                         /* store per path conf_data */
1162                         private->path_conf_data[pos] =
1163                                 (struct dasd_conf_data *) conf_data;
1164                         path_private.conf_data = NULL;
1165                         path_private.conf_len = 0;
1166                 }
1167                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1168                 case 0x02:
1169                         path_data->npm |= lpm;
1170                         break;
1171                 case 0x03:
1172                         path_data->ppm |= lpm;
1173                         break;
1174                 }
1175                 if (!path_data->opm) {
1176                         path_data->opm = lpm;
1177                         dasd_generic_path_operational(device);
1178                 } else {
1179                         path_data->opm |= lpm;
1180                 }
1181                 /*
1182                  * if the path is used
1183                  * it should not be in one of the negative lists
1184                  */
1185                 path_data->cablepm &= ~lpm;
1186                 path_data->hpfpm &= ~lpm;
1187                 path_data->cuirpm &= ~lpm;
1188         }
1189 
1190         return path_err;
1191 }
1192 
1193 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1194 {
1195         struct dasd_eckd_private *private = device->private;
1196         int mdc;
1197         u32 fcx_max_data;
1198 
1199         if (private->fcx_max_data) {
1200                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1201                 if ((mdc < 0)) {
1202                         dev_warn(&device->cdev->dev,
1203                                  "Detecting the maximum data size for zHPF "
1204                                  "requests failed (rc=%d) for a new path %x\n",
1205                                  mdc, lpm);
1206                         return mdc;
1207                 }
1208                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1209                 if (fcx_max_data < private->fcx_max_data) {
1210                         dev_warn(&device->cdev->dev,
1211                                  "The maximum data size for zHPF requests %u "
1212                                  "on a new path %x is below the active maximum "
1213                                  "%u\n", fcx_max_data, lpm,
1214                                  private->fcx_max_data);
1215                         return -EACCES;
1216                 }
1217         }
1218         return 0;
1219 }
1220 
1221 static int rebuild_device_uid(struct dasd_device *device,
1222                               struct path_verification_work_data *data)
1223 {
1224         struct dasd_eckd_private *private = device->private;
1225         struct dasd_path *path_data = &device->path_data;
1226         __u8 lpm, opm = path_data->opm;
1227         int rc = -ENODEV;
1228 
1229         for (lpm = 0x80; lpm; lpm >>= 1) {
1230                 if (!(lpm & opm))
1231                         continue;
1232                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1233                 memset(&data->cqr, 0, sizeof(data->cqr));
1234                 data->cqr.cpaddr = &data->ccw;
1235                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1236                                                      data->rcd_buffer,
1237                                                      lpm);
1238 
1239                 if (rc) {
1240                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1241                                 continue;
1242                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1243                                         "Read configuration data "
1244                                         "returned error %d", rc);
1245                         break;
1246                 }
1247                 memcpy(private->conf_data, data->rcd_buffer,
1248                        DASD_ECKD_RCD_DATA_SIZE);
1249                 if (dasd_eckd_identify_conf_parts(private)) {
1250                         rc = -ENODEV;
1251                 } else /* first valid path is enough */
1252                         break;
1253         }
1254 
1255         if (!rc)
1256                 rc = dasd_eckd_generate_uid(device);
1257 
1258         return rc;
1259 }
1260 
1261 static void do_path_verification_work(struct work_struct *work)
1262 {
1263         struct path_verification_work_data *data;
1264         struct dasd_device *device;
1265         struct dasd_eckd_private path_private;
1266         struct dasd_uid *uid;
1267         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1268         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1269         unsigned long flags;
1270         char print_uid[60];
1271         int rc;
1272 
1273         data = container_of(work, struct path_verification_work_data, worker);
1274         device = data->device;
1275 
1276         /* delay path verification until device was resumed */
1277         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1278                 schedule_work(work);
1279                 return;
1280         }
1281         /* check if path verification already running and delay if so */
1282         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1283                 schedule_work(work);
1284                 return;
1285         }
1286         opm = 0;
1287         npm = 0;
1288         ppm = 0;
1289         epm = 0;
1290         hpfpm = 0;
1291         cablepm = 0;
1292 
1293         for (lpm = 0x80; lpm; lpm >>= 1) {
1294                 if (!(lpm & data->tbvpm))
1295                         continue;
1296                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1297                 memset(&data->cqr, 0, sizeof(data->cqr));
1298                 data->cqr.cpaddr = &data->ccw;
1299                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1300                                                      data->rcd_buffer,
1301                                                      lpm);
1302                 if (!rc) {
1303                         switch (dasd_eckd_path_access(data->rcd_buffer,
1304                                                       DASD_ECKD_RCD_DATA_SIZE)
1305                                 ) {
1306                         case 0x02:
1307                                 npm |= lpm;
1308                                 break;
1309                         case 0x03:
1310                                 ppm |= lpm;
1311                                 break;
1312                         }
1313                         opm |= lpm;
1314                 } else if (rc == -EOPNOTSUPP) {
1315                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1316                                         "path verification: No configuration "
1317                                         "data retrieved");
1318                         opm |= lpm;
1319                 } else if (rc == -EAGAIN) {
1320                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1321                                         "path verification: device is stopped,"
1322                                         " try again later");
1323                         epm |= lpm;
1324                 } else {
1325                         dev_warn(&device->cdev->dev,
1326                                  "Reading device feature codes failed "
1327                                  "(rc=%d) for new path %x\n", rc, lpm);
1328                         continue;
1329                 }
1330                 if (verify_fcx_max_data(device, lpm)) {
1331                         opm &= ~lpm;
1332                         npm &= ~lpm;
1333                         ppm &= ~lpm;
1334                         hpfpm |= lpm;
1335                         continue;
1336                 }
1337 
1338                 /*
1339                  * save conf_data for comparison after
1340                  * rebuild_device_uid may have changed
1341                  * the original data
1342                  */
1343                 memcpy(&path_rcd_buf, data->rcd_buffer,
1344                        DASD_ECKD_RCD_DATA_SIZE);
1345                 path_private.conf_data = (void *) &path_rcd_buf;
1346                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1347                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1348                         path_private.conf_data = NULL;
1349                         path_private.conf_len = 0;
1350                         continue;
1351                 }
1352 
1353                 /*
1354                  * compare path UID with device UID only if at least
1355                  * one valid path is left
1356                  * in other case the device UID may have changed and
1357                  * the first working path UID will be used as device UID
1358                  */
1359                 if (device->path_data.opm &&
1360                     dasd_eckd_compare_path_uid(device, &path_private)) {
1361                         /*
1362                          * the comparison was not successful
1363                          * rebuild the device UID with at least one
1364                          * known path in case a z/VM hyperswap command
1365                          * has changed the device
1366                          *
1367                          * after this compare again
1368                          *
1369                          * if either the rebuild or the recompare fails
1370                          * the path can not be used
1371                          */
1372                         if (rebuild_device_uid(device, data) ||
1373                             dasd_eckd_compare_path_uid(
1374                                     device, &path_private)) {
1375                                 uid = &path_private.uid;
1376                                 if (strlen(uid->vduit) > 0)
1377                                         snprintf(print_uid, sizeof(print_uid),
1378                                                  "%s.%s.%04x.%02x.%s",
1379                                                  uid->vendor, uid->serial,
1380                                                  uid->ssid, uid->real_unit_addr,
1381                                                  uid->vduit);
1382                                 else
1383                                         snprintf(print_uid, sizeof(print_uid),
1384                                                  "%s.%s.%04x.%02x",
1385                                                  uid->vendor, uid->serial,
1386                                                  uid->ssid,
1387                                                  uid->real_unit_addr);
1388                                 dev_err(&device->cdev->dev,
1389                                         "The newly added channel path %02X "
1390                                         "will not be used because it leads "
1391                                         "to a different device %s\n",
1392                                         lpm, print_uid);
1393                                 opm &= ~lpm;
1394                                 npm &= ~lpm;
1395                                 ppm &= ~lpm;
1396                                 cablepm |= lpm;
1397                                 continue;
1398                         }
1399                 }
1400 
1401                 /*
1402                  * There is a small chance that a path is lost again between
1403                  * above path verification and the following modification of
1404                  * the device opm mask. We could avoid that race here by using
1405                  * yet another path mask, but we rather deal with this unlikely
1406                  * situation in dasd_start_IO.
1407                  */
1408                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1409                 if (!device->path_data.opm && opm) {
1410                         device->path_data.opm = opm;
1411                         device->path_data.cablepm &= ~opm;
1412                         device->path_data.cuirpm &= ~opm;
1413                         device->path_data.hpfpm &= ~opm;
1414                         dasd_generic_path_operational(device);
1415                 } else {
1416                         device->path_data.opm |= opm;
1417                         device->path_data.cablepm &= ~opm;
1418                         device->path_data.cuirpm &= ~opm;
1419                         device->path_data.hpfpm &= ~opm;
1420                 }
1421                 device->path_data.npm |= npm;
1422                 device->path_data.ppm |= ppm;
1423                 device->path_data.tbvpm |= epm;
1424                 device->path_data.cablepm |= cablepm;
1425                 device->path_data.hpfpm |= hpfpm;
1426                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1427         }
1428         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1429         dasd_put_device(device);
1430         if (data->isglobal)
1431                 mutex_unlock(&dasd_path_verification_mutex);
1432         else
1433                 kfree(data);
1434 }
1435 
1436 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1437 {
1438         struct path_verification_work_data *data;
1439 
1440         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1441         if (!data) {
1442                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1443                         data = path_verification_worker;
1444                         data->isglobal = 1;
1445                 } else
1446                         return -ENOMEM;
1447         } else {
1448                 memset(data, 0, sizeof(*data));
1449                 data->isglobal = 0;
1450         }
1451         INIT_WORK(&data->worker, do_path_verification_work);
1452         dasd_get_device(device);
1453         data->device = device;
1454         data->tbvpm = lpm;
1455         schedule_work(&data->worker);
1456         return 0;
1457 }
1458 
1459 static int dasd_eckd_read_features(struct dasd_device *device)
1460 {
1461         struct dasd_eckd_private *private = device->private;
1462         struct dasd_psf_prssd_data *prssdp;
1463         struct dasd_rssd_features *features;
1464         struct dasd_ccw_req *cqr;
1465         struct ccw1 *ccw;
1466         int rc;
1467 
1468         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1469         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1470                                    (sizeof(struct dasd_psf_prssd_data) +
1471                                     sizeof(struct dasd_rssd_features)),
1472                                    device);
1473         if (IS_ERR(cqr)) {
1474                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1475                                 "allocate initialization request");
1476                 return PTR_ERR(cqr);
1477         }
1478         cqr->startdev = device;
1479         cqr->memdev = device;
1480         cqr->block = NULL;
1481         cqr->retries = 256;
1482         cqr->expires = 10 * HZ;
1483 
1484         /* Prepare for Read Subsystem Data */
1485         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1486         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1487         prssdp->order = PSF_ORDER_PRSSD;
1488         prssdp->suborder = 0x41;        /* Read Feature Codes */
1489         /* all other bytes of prssdp must be zero */
1490 
1491         ccw = cqr->cpaddr;
1492         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1493         ccw->count = sizeof(struct dasd_psf_prssd_data);
1494         ccw->flags |= CCW_FLAG_CC;
1495         ccw->cda = (__u32)(addr_t) prssdp;
1496 
1497         /* Read Subsystem Data - feature codes */
1498         features = (struct dasd_rssd_features *) (prssdp + 1);
1499         memset(features, 0, sizeof(struct dasd_rssd_features));
1500 
1501         ccw++;
1502         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1503         ccw->count = sizeof(struct dasd_rssd_features);
1504         ccw->cda = (__u32)(addr_t) features;
1505 
1506         cqr->buildclk = get_tod_clock();
1507         cqr->status = DASD_CQR_FILLED;
1508         rc = dasd_sleep_on(cqr);
1509         if (rc == 0) {
1510                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1511                 features = (struct dasd_rssd_features *) (prssdp + 1);
1512                 memcpy(&private->features, features,
1513                        sizeof(struct dasd_rssd_features));
1514         } else
1515                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1516                          " failed with rc=%d\n", rc);
1517         dasd_sfree_request(cqr, cqr->memdev);
1518         return rc;
1519 }
1520 
1521 
1522 /*
1523  * Build CP for Perform Subsystem Function - SSC.
1524  */
1525 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1526                                                     int enable_pav)
1527 {
1528         struct dasd_ccw_req *cqr;
1529         struct dasd_psf_ssc_data *psf_ssc_data;
1530         struct ccw1 *ccw;
1531 
1532         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1533                                   sizeof(struct dasd_psf_ssc_data),
1534                                   device);
1535 
1536         if (IS_ERR(cqr)) {
1537                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1538                            "Could not allocate PSF-SSC request");
1539                 return cqr;
1540         }
1541         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1542         psf_ssc_data->order = PSF_ORDER_SSC;
1543         psf_ssc_data->suborder = 0xc0;
1544         if (enable_pav) {
1545                 psf_ssc_data->suborder |= 0x08;
1546                 psf_ssc_data->reserved[0] = 0x88;
1547         }
1548         ccw = cqr->cpaddr;
1549         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1550         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1551         ccw->count = 66;
1552 
1553         cqr->startdev = device;
1554         cqr->memdev = device;
1555         cqr->block = NULL;
1556         cqr->retries = 256;
1557         cqr->expires = 10*HZ;
1558         cqr->buildclk = get_tod_clock();
1559         cqr->status = DASD_CQR_FILLED;
1560         return cqr;
1561 }
1562 
1563 /*
1564  * Perform Subsystem Function.
1565  * It is necessary to trigger CIO for channel revalidation since this
1566  * call might change behaviour of DASD devices.
1567  */
1568 static int
1569 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1570                   unsigned long flags)
1571 {
1572         struct dasd_ccw_req *cqr;
1573         int rc;
1574 
1575         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1576         if (IS_ERR(cqr))
1577                 return PTR_ERR(cqr);
1578 
1579         /*
1580          * set flags e.g. turn on failfast, to prevent blocking
1581          * the calling function should handle failed requests
1582          */
1583         cqr->flags |= flags;
1584 
1585         rc = dasd_sleep_on(cqr);
1586         if (!rc)
1587                 /* trigger CIO to reprobe devices */
1588                 css_schedule_reprobe();
1589         else if (cqr->intrc == -EAGAIN)
1590                 rc = -EAGAIN;
1591 
1592         dasd_sfree_request(cqr, cqr->memdev);
1593         return rc;
1594 }
1595 
1596 /*
1597  * Valide storage server of current device.
1598  */
1599 static int dasd_eckd_validate_server(struct dasd_device *device,
1600                                      unsigned long flags)
1601 {
1602         struct dasd_eckd_private *private = device->private;
1603         int enable_pav, rc;
1604 
1605         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1606             private->uid.type == UA_HYPER_PAV_ALIAS)
1607                 return 0;
1608         if (dasd_nopav || MACHINE_IS_VM)
1609                 enable_pav = 0;
1610         else
1611                 enable_pav = 1;
1612         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1613 
1614         /* may be requested feature is not available on server,
1615          * therefore just report error and go ahead */
1616         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1617                         "returned rc=%d", private->uid.ssid, rc);
1618         return rc;
1619 }
1620 
1621 /*
1622  * worker to do a validate server in case of a lost pathgroup
1623  */
1624 static void dasd_eckd_do_validate_server(struct work_struct *work)
1625 {
1626         struct dasd_device *device = container_of(work, struct dasd_device,
1627                                                   kick_validate);
1628         unsigned long flags = 0;
1629 
1630         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1631         if (dasd_eckd_validate_server(device, flags)
1632             == -EAGAIN) {
1633                 /* schedule worker again if failed */
1634                 schedule_work(&device->kick_validate);
1635                 return;
1636         }
1637 
1638         dasd_put_device(device);
1639 }
1640 
1641 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1642 {
1643         dasd_get_device(device);
1644         /* exit if device not online or in offline processing */
1645         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1646            device->state < DASD_STATE_ONLINE) {
1647                 dasd_put_device(device);
1648                 return;
1649         }
1650         /* queue call to do_validate_server to the kernel event daemon. */
1651         if (!schedule_work(&device->kick_validate))
1652                 dasd_put_device(device);
1653 }
1654 
1655 static u32 get_fcx_max_data(struct dasd_device *device)
1656 {
1657         struct dasd_eckd_private *private = device->private;
1658         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1659         int tpm, mdc;
1660 
1661         if (dasd_nofcx)
1662                 return 0;
1663         /* is transport mode supported? */
1664         fcx_in_css = css_general_characteristics.fcx;
1665         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1666         fcx_in_features = private->features.feature[40] & 0x80;
1667         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1668 
1669         if (!tpm)
1670                 return 0;
1671 
1672         mdc = ccw_device_get_mdc(device->cdev, 0);
1673         if (mdc < 0) {
1674                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1675                          " data size for zHPF requests failed\n");
1676                 return 0;
1677         } else
1678                 return mdc * FCX_MAX_DATA_FACTOR;
1679 }
1680 
1681 /*
1682  * Check device characteristics.
1683  * If the device is accessible using ECKD discipline, the device is enabled.
1684  */
1685 static int
1686 dasd_eckd_check_characteristics(struct dasd_device *device)
1687 {
1688         struct dasd_eckd_private *private = device->private;
1689         struct dasd_block *block;
1690         struct dasd_uid temp_uid;
1691         int rc, i;
1692         int readonly;
1693         unsigned long value;
1694 
1695         /* setup work queue for validate server*/
1696         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1697         /* setup work queue for summary unit check */
1698         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1699 
1700         if (!ccw_device_is_pathgroup(device->cdev)) {
1701                 dev_warn(&device->cdev->dev,
1702                          "A channel path group could not be established\n");
1703                 return -EIO;
1704         }
1705         if (!ccw_device_is_multipath(device->cdev)) {
1706                 dev_info(&device->cdev->dev,
1707                          "The DASD is not operating in multipath mode\n");
1708         }
1709         if (!private) {
1710                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1711                 if (!private) {
1712                         dev_warn(&device->cdev->dev,
1713                                  "Allocating memory for private DASD data "
1714                                  "failed\n");
1715                         return -ENOMEM;
1716                 }
1717                 device->private = private;
1718         } else {
1719                 memset(private, 0, sizeof(*private));
1720         }
1721         /* Invalidate status of initial analysis. */
1722         private->init_cqr_status = -1;
1723         /* Set default cache operations. */
1724         private->attrib.operation = DASD_NORMAL_CACHE;
1725         private->attrib.nr_cyl = 0;
1726 
1727         /* Read Configuration Data */
1728         rc = dasd_eckd_read_conf(device);
1729         if (rc)
1730                 goto out_err1;
1731 
1732         /* set default timeout */
1733         device->default_expires = DASD_EXPIRES;
1734         /* set default retry count */
1735         device->default_retries = DASD_RETRIES;
1736 
1737         if (private->gneq) {
1738                 value = 1;
1739                 for (i = 0; i < private->gneq->timeout.value; i++)
1740                         value = 10 * value;
1741                 value = value * private->gneq->timeout.number;
1742                 /* do not accept useless values */
1743                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1744                         device->default_expires = value;
1745         }
1746 
1747         dasd_eckd_get_uid(device, &temp_uid);
1748         if (temp_uid.type == UA_BASE_DEVICE) {
1749                 block = dasd_alloc_block();
1750                 if (IS_ERR(block)) {
1751                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1752                                         "could not allocate dasd "
1753                                         "block structure");
1754                         rc = PTR_ERR(block);
1755                         goto out_err1;
1756                 }
1757                 device->block = block;
1758                 block->base = device;
1759         }
1760 
1761         /* register lcu with alias handling, enable PAV */
1762         rc = dasd_alias_make_device_known_to_lcu(device);
1763         if (rc)
1764                 goto out_err2;
1765 
1766         dasd_eckd_validate_server(device, 0);
1767 
1768         /* device may report different configuration data after LCU setup */
1769         rc = dasd_eckd_read_conf(device);
1770         if (rc)
1771                 goto out_err3;
1772 
1773         /* Read Feature Codes */
1774         dasd_eckd_read_features(device);
1775 
1776         /* Read Device Characteristics */
1777         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1778                                          &private->rdc_data, 64);
1779         if (rc) {
1780                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1781                                 "Read device characteristic failed, rc=%d", rc);
1782                 goto out_err3;
1783         }
1784 
1785         if ((device->features & DASD_FEATURE_USERAW) &&
1786             !(private->rdc_data.facilities.RT_in_LR)) {
1787                 dev_err(&device->cdev->dev, "The storage server does not "
1788                         "support raw-track access\n");
1789                 rc = -EINVAL;
1790                 goto out_err3;
1791         }
1792 
1793         /* find the valid cylinder size */
1794         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1795             private->rdc_data.long_no_cyl)
1796                 private->real_cyl = private->rdc_data.long_no_cyl;
1797         else
1798                 private->real_cyl = private->rdc_data.no_cyl;
1799 
1800         private->fcx_max_data = get_fcx_max_data(device);
1801 
1802         readonly = dasd_device_is_ro(device);
1803         if (readonly)
1804                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1805 
1806         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1807                  "with %d cylinders, %d heads, %d sectors%s\n",
1808                  private->rdc_data.dev_type,
1809                  private->rdc_data.dev_model,
1810                  private->rdc_data.cu_type,
1811                  private->rdc_data.cu_model.model,
1812                  private->real_cyl,
1813                  private->rdc_data.trk_per_cyl,
1814                  private->rdc_data.sec_per_trk,
1815                  readonly ? ", read-only device" : "");
1816         return 0;
1817 
1818 out_err3:
1819         dasd_alias_disconnect_device_from_lcu(device);
1820 out_err2:
1821         dasd_free_block(device->block);
1822         device->block = NULL;
1823 out_err1:
1824         kfree(private->conf_data);
1825         kfree(device->private);
1826         device->private = NULL;
1827         return rc;
1828 }
1829 
1830 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1831 {
1832         struct dasd_eckd_private *private = device->private;
1833         int i;
1834 
1835         dasd_alias_disconnect_device_from_lcu(device);
1836         private->ned = NULL;
1837         private->sneq = NULL;
1838         private->vdsneq = NULL;
1839         private->gneq = NULL;
1840         private->conf_len = 0;
1841         for (i = 0; i < 8; i++) {
1842                 kfree(private->path_conf_data[i]);
1843                 if ((__u8 *)private->path_conf_data[i] ==
1844                     private->conf_data) {
1845                         private->conf_data = NULL;
1846                         private->conf_len = 0;
1847                 }
1848                 private->path_conf_data[i] = NULL;
1849         }
1850         kfree(private->conf_data);
1851         private->conf_data = NULL;
1852 }
1853 
1854 static struct dasd_ccw_req *
1855 dasd_eckd_analysis_ccw(struct dasd_device *device)
1856 {
1857         struct dasd_eckd_private *private = device->private;
1858         struct eckd_count *count_data;
1859         struct LO_eckd_data *LO_data;
1860         struct dasd_ccw_req *cqr;
1861         struct ccw1 *ccw;
1862         int cplength, datasize;
1863         int i;
1864 
1865         cplength = 8;
1866         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1867         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1868         if (IS_ERR(cqr))
1869                 return cqr;
1870         ccw = cqr->cpaddr;
1871         /* Define extent for the first 3 tracks. */
1872         define_extent(ccw++, cqr->data, 0, 2,
1873                       DASD_ECKD_CCW_READ_COUNT, device);
1874         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1875         /* Locate record for the first 4 records on track 0. */
1876         ccw[-1].flags |= CCW_FLAG_CC;
1877         locate_record(ccw++, LO_data++, 0, 0, 4,
1878                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1879 
1880         count_data = private->count_area;
1881         for (i = 0; i < 4; i++) {
1882                 ccw[-1].flags |= CCW_FLAG_CC;
1883                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1884                 ccw->flags = 0;
1885                 ccw->count = 8;
1886                 ccw->cda = (__u32)(addr_t) count_data;
1887                 ccw++;
1888                 count_data++;
1889         }
1890 
1891         /* Locate record for the first record on track 2. */
1892         ccw[-1].flags |= CCW_FLAG_CC;
1893         locate_record(ccw++, LO_data++, 2, 0, 1,
1894                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1895         /* Read count ccw. */
1896         ccw[-1].flags |= CCW_FLAG_CC;
1897         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1898         ccw->flags = 0;
1899         ccw->count = 8;
1900         ccw->cda = (__u32)(addr_t) count_data;
1901 
1902         cqr->block = NULL;
1903         cqr->startdev = device;
1904         cqr->memdev = device;
1905         cqr->retries = 255;
1906         cqr->buildclk = get_tod_clock();
1907         cqr->status = DASD_CQR_FILLED;
1908         return cqr;
1909 }
1910 
1911 /* differentiate between 'no record found' and any other error */
1912 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1913 {
1914         char *sense;
1915         if (init_cqr->status == DASD_CQR_DONE)
1916                 return INIT_CQR_OK;
1917         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1918                  init_cqr->status == DASD_CQR_FAILED) {
1919                 sense = dasd_get_sense(&init_cqr->irb);
1920                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1921                         return INIT_CQR_UNFORMATTED;
1922                 else
1923                         return INIT_CQR_ERROR;
1924         } else
1925                 return INIT_CQR_ERROR;
1926 }
1927 
1928 /*
1929  * This is the callback function for the init_analysis cqr. It saves
1930  * the status of the initial analysis ccw before it frees it and kicks
1931  * the device to continue the startup sequence. This will call
1932  * dasd_eckd_do_analysis again (if the devices has not been marked
1933  * for deletion in the meantime).
1934  */
1935 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1936                                         void *data)
1937 {
1938         struct dasd_device *device = init_cqr->startdev;
1939         struct dasd_eckd_private *private = device->private;
1940 
1941         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1942         dasd_sfree_request(init_cqr, device);
1943         dasd_kick_device(device);
1944 }
1945 
1946 static int dasd_eckd_start_analysis(struct dasd_block *block)
1947 {
1948         struct dasd_ccw_req *init_cqr;
1949 
1950         init_cqr = dasd_eckd_analysis_ccw(block->base);
1951         if (IS_ERR(init_cqr))
1952                 return PTR_ERR(init_cqr);
1953         init_cqr->callback = dasd_eckd_analysis_callback;
1954         init_cqr->callback_data = NULL;
1955         init_cqr->expires = 5*HZ;
1956         /* first try without ERP, so we can later handle unformatted
1957          * devices as special case
1958          */
1959         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1960         init_cqr->retries = 0;
1961         dasd_add_request_head(init_cqr);
1962         return -EAGAIN;
1963 }
1964 
1965 static int dasd_eckd_end_analysis(struct dasd_block *block)
1966 {
1967         struct dasd_device *device = block->base;
1968         struct dasd_eckd_private *private = device->private;
1969         struct eckd_count *count_area;
1970         unsigned int sb, blk_per_trk;
1971         int status, i;
1972         struct dasd_ccw_req *init_cqr;
1973 
1974         status = private->init_cqr_status;
1975         private->init_cqr_status = -1;
1976         if (status == INIT_CQR_ERROR) {
1977                 /* try again, this time with full ERP */
1978                 init_cqr = dasd_eckd_analysis_ccw(device);
1979                 dasd_sleep_on(init_cqr);
1980                 status = dasd_eckd_analysis_evaluation(init_cqr);
1981                 dasd_sfree_request(init_cqr, device);
1982         }
1983 
1984         if (device->features & DASD_FEATURE_USERAW) {
1985                 block->bp_block = DASD_RAW_BLOCKSIZE;
1986                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1987                 block->s2b_shift = 3;
1988                 goto raw;
1989         }
1990 
1991         if (status == INIT_CQR_UNFORMATTED) {
1992                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1993                 return -EMEDIUMTYPE;
1994         } else if (status == INIT_CQR_ERROR) {
1995                 dev_err(&device->cdev->dev,
1996                         "Detecting the DASD disk layout failed because "
1997                         "of an I/O error\n");
1998                 return -EIO;
1999         }
2000 
2001         private->uses_cdl = 1;
2002         /* Check Track 0 for Compatible Disk Layout */
2003         count_area = NULL;
2004         for (i = 0; i < 3; i++) {
2005                 if (private->count_area[i].kl != 4 ||
2006                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2007                     private->count_area[i].cyl != 0 ||
2008                     private->count_area[i].head != count_area_head[i] ||
2009                     private->count_area[i].record != count_area_rec[i]) {
2010                         private->uses_cdl = 0;
2011                         break;
2012                 }
2013         }
2014         if (i == 3)
2015                 count_area = &private->count_area[4];
2016 
2017         if (private->uses_cdl == 0) {
2018                 for (i = 0; i < 5; i++) {
2019                         if ((private->count_area[i].kl != 0) ||
2020                             (private->count_area[i].dl !=
2021                              private->count_area[0].dl) ||
2022                             private->count_area[i].cyl !=  0 ||
2023                             private->count_area[i].head != count_area_head[i] ||
2024                             private->count_area[i].record != count_area_rec[i])
2025                                 break;
2026                 }
2027                 if (i == 5)
2028                         count_area = &private->count_area[0];
2029         } else {
2030                 if (private->count_area[3].record == 1)
2031                         dev_warn(&device->cdev->dev,
2032                                  "Track 0 has no records following the VTOC\n");
2033         }
2034 
2035         if (count_area != NULL && count_area->kl == 0) {
2036                 /* we found notthing violating our disk layout */
2037                 if (dasd_check_blocksize(count_area->dl) == 0)
2038                         block->bp_block = count_area->dl;
2039         }
2040         if (block->bp_block == 0) {
2041                 dev_warn(&device->cdev->dev,
2042                          "The disk layout of the DASD is not supported\n");
2043                 return -EMEDIUMTYPE;
2044         }
2045         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2046         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2047                 block->s2b_shift++;
2048 
2049         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2050 
2051 raw:
2052         block->blocks = (private->real_cyl *
2053                           private->rdc_data.trk_per_cyl *
2054                           blk_per_trk);
2055 
2056         dev_info(&device->cdev->dev,
2057                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2058                  "%s\n", (block->bp_block >> 10),
2059                  ((private->real_cyl *
2060                    private->rdc_data.trk_per_cyl *
2061                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2062                  ((blk_per_trk * block->bp_block) >> 10),
2063                  private->uses_cdl ?
2064                  "compatible disk layout" : "linux disk layout");
2065 
2066         return 0;
2067 }
2068 
2069 static int dasd_eckd_do_analysis(struct dasd_block *block)
2070 {
2071         struct dasd_eckd_private *private = block->base->private;
2072 
2073         if (private->init_cqr_status < 0)
2074                 return dasd_eckd_start_analysis(block);
2075         else
2076                 return dasd_eckd_end_analysis(block);
2077 }
2078 
2079 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2080 {
2081         return dasd_alias_add_device(device);
2082 };
2083 
2084 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2085 {
2086         cancel_work_sync(&device->reload_device);
2087         cancel_work_sync(&device->kick_validate);
2088         return 0;
2089 };
2090 
2091 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2092 {
2093         return dasd_alias_remove_device(device);
2094 };
2095 
2096 static int
2097 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2098 {
2099         struct dasd_eckd_private *private = block->base->private;
2100 
2101         if (dasd_check_blocksize(block->bp_block) == 0) {
2102                 geo->sectors = recs_per_track(&private->rdc_data,
2103                                               0, block->bp_block);
2104         }
2105         geo->cylinders = private->rdc_data.no_cyl;
2106         geo->heads = private->rdc_data.trk_per_cyl;
2107         return 0;
2108 }
2109 
2110 /*
2111  * Build the TCW request for the format check
2112  */
2113 static struct dasd_ccw_req *
2114 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2115                           int enable_pav, struct eckd_count *fmt_buffer,
2116                           int rpt)
2117 {
2118         struct dasd_eckd_private *start_priv;
2119         struct dasd_device *startdev = NULL;
2120         struct tidaw *last_tidaw = NULL;
2121         struct dasd_ccw_req *cqr;
2122         struct itcw *itcw;
2123         int itcw_size;
2124         int count;
2125         int rc;
2126         int i;
2127 
2128         if (enable_pav)
2129                 startdev = dasd_alias_get_start_dev(base);
2130 
2131         if (!startdev)
2132                 startdev = base;
2133 
2134         start_priv = startdev->private;
2135 
2136         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2137 
2138         /*
2139          * we're adding 'count' amount of tidaw to the itcw.
2140          * calculate the corresponding itcw_size
2141          */
2142         itcw_size = itcw_calc_size(0, count, 0);
2143 
2144         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2145         if (IS_ERR(cqr))
2146                 return cqr;
2147 
2148         start_priv->count++;
2149 
2150         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2151         if (IS_ERR(itcw)) {
2152                 rc = -EINVAL;
2153                 goto out_err;
2154         }
2155 
2156         cqr->cpaddr = itcw_get_tcw(itcw);
2157         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2158                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2159                           sizeof(struct eckd_count),
2160                           count * sizeof(struct eckd_count), 0, rpt);
2161         if (rc)
2162                 goto out_err;
2163 
2164         for (i = 0; i < count; i++) {
2165                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2166                                             sizeof(struct eckd_count));
2167                 if (IS_ERR(last_tidaw)) {
2168                         rc = -EINVAL;
2169                         goto out_err;
2170                 }
2171         }
2172 
2173         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2174         itcw_finalize(itcw);
2175 
2176         cqr->cpmode = 1;
2177         cqr->startdev = startdev;
2178         cqr->memdev = startdev;
2179         cqr->basedev = base;
2180         cqr->retries = startdev->default_retries;
2181         cqr->expires = startdev->default_expires * HZ;
2182         cqr->buildclk = get_tod_clock();
2183         cqr->status = DASD_CQR_FILLED;
2184         /* Set flags to suppress output for expected errors */
2185         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2186         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2187 
2188         return cqr;
2189 
2190 out_err:
2191         dasd_sfree_request(cqr, startdev);
2192 
2193         return ERR_PTR(rc);
2194 }
2195 
2196 /*
2197  * Build the CCW request for the format check
2198  */
2199 static struct dasd_ccw_req *
2200 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2201                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2202 {
2203         struct dasd_eckd_private *start_priv;
2204         struct dasd_eckd_private *base_priv;
2205         struct dasd_device *startdev = NULL;
2206         struct dasd_ccw_req *cqr;
2207         struct ccw1 *ccw;
2208         void *data;
2209         int cplength, datasize;
2210         int use_prefix;
2211         int count;
2212         int i;
2213 
2214         if (enable_pav)
2215                 startdev = dasd_alias_get_start_dev(base);
2216 
2217         if (!startdev)
2218                 startdev = base;
2219 
2220         start_priv = startdev->private;
2221         base_priv = base->private;
2222 
2223         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2224 
2225         use_prefix = base_priv->features.feature[8] & 0x01;
2226 
2227         if (use_prefix) {
2228                 cplength = 1;
2229                 datasize = sizeof(struct PFX_eckd_data);
2230         } else {
2231                 cplength = 2;
2232                 datasize = sizeof(struct DE_eckd_data) +
2233                         sizeof(struct LO_eckd_data);
2234         }
2235         cplength += count;
2236 
2237         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2238                                   startdev);
2239         if (IS_ERR(cqr))
2240                 return cqr;
2241 
2242         start_priv->count++;
2243         data = cqr->data;
2244         ccw = cqr->cpaddr;
2245 
2246         if (use_prefix) {
2247                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2248                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2249                            count, 0, 0);
2250         } else {
2251                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2252                               DASD_ECKD_CCW_READ_COUNT, startdev);
2253 
2254                 data += sizeof(struct DE_eckd_data);
2255                 ccw[-1].flags |= CCW_FLAG_CC;
2256 
2257                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2258                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2259         }
2260 
2261         for (i = 0; i < count; i++) {
2262                 ccw[-1].flags |= CCW_FLAG_CC;
2263                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2264                 ccw->flags = CCW_FLAG_SLI;
2265                 ccw->count = 8;
2266                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2267                 ccw++;
2268                 fmt_buffer++;
2269         }
2270 
2271         cqr->startdev = startdev;
2272         cqr->memdev = startdev;
2273         cqr->basedev = base;
2274         cqr->retries = DASD_RETRIES;
2275         cqr->expires = startdev->default_expires * HZ;
2276         cqr->buildclk = get_tod_clock();
2277         cqr->status = DASD_CQR_FILLED;
2278         /* Set flags to suppress output for expected errors */
2279         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2280 
2281         return cqr;
2282 }
2283 
2284 static struct dasd_ccw_req *
2285 dasd_eckd_build_format(struct dasd_device *base,
2286                        struct format_data_t *fdata,
2287                        int enable_pav)
2288 {
2289         struct dasd_eckd_private *base_priv;
2290         struct dasd_eckd_private *start_priv;
2291         struct dasd_device *startdev = NULL;
2292         struct dasd_ccw_req *fcp;
2293         struct eckd_count *ect;
2294         struct ch_t address;
2295         struct ccw1 *ccw;
2296         void *data;
2297         int rpt;
2298         int cplength, datasize;
2299         int i, j;
2300         int intensity = 0;
2301         int r0_perm;
2302         int nr_tracks;
2303         int use_prefix;
2304 
2305         if (enable_pav)
2306                 startdev = dasd_alias_get_start_dev(base);
2307 
2308         if (!startdev)
2309                 startdev = base;
2310 
2311         start_priv = startdev->private;
2312         base_priv = base->private;
2313 
2314         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2315 
2316         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2317 
2318         /*
2319          * fdata->intensity is a bit string that tells us what to do:
2320          *   Bit 0: write record zero
2321          *   Bit 1: write home address, currently not supported
2322          *   Bit 2: invalidate tracks
2323          *   Bit 3: use OS/390 compatible disk layout (cdl)
2324          *   Bit 4: do not allow storage subsystem to modify record zero
2325          * Only some bit combinations do make sense.
2326          */
2327         if (fdata->intensity & 0x10) {
2328                 r0_perm = 0;
2329                 intensity = fdata->intensity & ~0x10;
2330         } else {
2331                 r0_perm = 1;
2332                 intensity = fdata->intensity;
2333         }
2334 
2335         use_prefix = base_priv->features.feature[8] & 0x01;
2336 
2337         switch (intensity) {
2338         case 0x00:      /* Normal format */
2339         case 0x08:      /* Normal format, use cdl. */
2340                 cplength = 2 + (rpt*nr_tracks);
2341                 if (use_prefix)
2342                         datasize = sizeof(struct PFX_eckd_data) +
2343                                 sizeof(struct LO_eckd_data) +
2344                                 rpt * nr_tracks * sizeof(struct eckd_count);
2345                 else
2346                         datasize = sizeof(struct DE_eckd_data) +
2347                                 sizeof(struct LO_eckd_data) +
2348                                 rpt * nr_tracks * sizeof(struct eckd_count);
2349                 break;
2350         case 0x01:      /* Write record zero and format track. */
2351         case 0x09:      /* Write record zero and format track, use cdl. */
2352                 cplength = 2 + rpt * nr_tracks;
2353                 if (use_prefix)
2354                         datasize = sizeof(struct PFX_eckd_data) +
2355                                 sizeof(struct LO_eckd_data) +
2356                                 sizeof(struct eckd_count) +
2357                                 rpt * nr_tracks * sizeof(struct eckd_count);
2358                 else
2359                         datasize = sizeof(struct DE_eckd_data) +
2360                                 sizeof(struct LO_eckd_data) +
2361                                 sizeof(struct eckd_count) +
2362                                 rpt * nr_tracks * sizeof(struct eckd_count);
2363                 break;
2364         case 0x04:      /* Invalidate track. */
2365         case 0x0c:      /* Invalidate track, use cdl. */
2366                 cplength = 3;
2367                 if (use_prefix)
2368                         datasize = sizeof(struct PFX_eckd_data) +
2369                                 sizeof(struct LO_eckd_data) +
2370                                 sizeof(struct eckd_count);
2371                 else
2372                         datasize = sizeof(struct DE_eckd_data) +
2373                                 sizeof(struct LO_eckd_data) +
2374                                 sizeof(struct eckd_count);
2375                 break;
2376         default:
2377                 dev_warn(&startdev->cdev->dev,
2378                          "An I/O control call used incorrect flags 0x%x\n",
2379                          fdata->intensity);
2380                 return ERR_PTR(-EINVAL);
2381         }
2382         /* Allocate the format ccw request. */
2383         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2384                                    datasize, startdev);
2385         if (IS_ERR(fcp))
2386                 return fcp;
2387 
2388         start_priv->count++;
2389         data = fcp->data;
2390         ccw = fcp->cpaddr;
2391 
2392         switch (intensity & ~0x08) {
2393         case 0x00: /* Normal format. */
2394                 if (use_prefix) {
2395                         prefix(ccw++, (struct PFX_eckd_data *) data,
2396                                fdata->start_unit, fdata->stop_unit,
2397                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2398                         /* grant subsystem permission to format R0 */
2399                         if (r0_perm)
2400                                 ((struct PFX_eckd_data *)data)
2401                                         ->define_extent.ga_extended |= 0x04;
2402                         data += sizeof(struct PFX_eckd_data);
2403                 } else {
2404                         define_extent(ccw++, (struct DE_eckd_data *) data,
2405                                       fdata->start_unit, fdata->stop_unit,
2406                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2407                         /* grant subsystem permission to format R0 */
2408                         if (r0_perm)
2409                                 ((struct DE_eckd_data *) data)
2410                                         ->ga_extended |= 0x04;
2411                         data += sizeof(struct DE_eckd_data);
2412                 }
2413                 ccw[-1].flags |= CCW_FLAG_CC;
2414                 locate_record(ccw++, (struct LO_eckd_data *) data,
2415                               fdata->start_unit, 0, rpt*nr_tracks,
2416                               DASD_ECKD_CCW_WRITE_CKD, base,
2417                               fdata->blksize);
2418                 data += sizeof(struct LO_eckd_data);
2419                 break;
2420         case 0x01: /* Write record zero + format track. */
2421                 if (use_prefix) {
2422                         prefix(ccw++, (struct PFX_eckd_data *) data,
2423                                fdata->start_unit, fdata->stop_unit,
2424                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2425                                base, startdev);
2426                         data += sizeof(struct PFX_eckd_data);
2427                 } else {
2428                         define_extent(ccw++, (struct DE_eckd_data *) data,
2429                                fdata->start_unit, fdata->stop_unit,
2430                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2431                         data += sizeof(struct DE_eckd_data);
2432                 }
2433                 ccw[-1].flags |= CCW_FLAG_CC;
2434                 locate_record(ccw++, (struct LO_eckd_data *) data,
2435                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2436                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2437                               base->block->bp_block);
2438                 data += sizeof(struct LO_eckd_data);
2439                 break;
2440         case 0x04: /* Invalidate track. */
2441                 if (use_prefix) {
2442                         prefix(ccw++, (struct PFX_eckd_data *) data,
2443                                fdata->start_unit, fdata->stop_unit,
2444                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2445                         data += sizeof(struct PFX_eckd_data);
2446                 } else {
2447                         define_extent(ccw++, (struct DE_eckd_data *) data,
2448                                fdata->start_unit, fdata->stop_unit,
2449                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2450                         data += sizeof(struct DE_eckd_data);
2451                 }
2452                 ccw[-1].flags |= CCW_FLAG_CC;
2453                 locate_record(ccw++, (struct LO_eckd_data *) data,
2454                               fdata->start_unit, 0, 1,
2455                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2456                 data += sizeof(struct LO_eckd_data);
2457                 break;
2458         }
2459 
2460         for (j = 0; j < nr_tracks; j++) {
2461                 /* calculate cylinder and head for the current track */
2462                 set_ch_t(&address,
2463                          (fdata->start_unit + j) /
2464                          base_priv->rdc_data.trk_per_cyl,
2465                          (fdata->start_unit + j) %
2466                          base_priv->rdc_data.trk_per_cyl);
2467                 if (intensity & 0x01) { /* write record zero */
2468                         ect = (struct eckd_count *) data;
2469                         data += sizeof(struct eckd_count);
2470                         ect->cyl = address.cyl;
2471                         ect->head = address.head;
2472                         ect->record = 0;
2473                         ect->kl = 0;
2474                         ect->dl = 8;
2475                         ccw[-1].flags |= CCW_FLAG_CC;
2476                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2477                         ccw->flags = CCW_FLAG_SLI;
2478                         ccw->count = 8;
2479                         ccw->cda = (__u32)(addr_t) ect;
2480                         ccw++;
2481                 }
2482                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2483                         ect = (struct eckd_count *) data;
2484                         data += sizeof(struct eckd_count);
2485                         ect->cyl = address.cyl;
2486                         ect->head = address.head;
2487                         ect->record = 1;
2488                         ect->kl = 0;
2489                         ect->dl = 0;
2490                         ccw[-1].flags |= CCW_FLAG_CC;
2491                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2492                         ccw->flags = CCW_FLAG_SLI;
2493                         ccw->count = 8;
2494                         ccw->cda = (__u32)(addr_t) ect;
2495                 } else {                /* write remaining records */
2496                         for (i = 0; i < rpt; i++) {
2497                                 ect = (struct eckd_count *) data;
2498                                 data += sizeof(struct eckd_count);
2499                                 ect->cyl = address.cyl;
2500                                 ect->head = address.head;
2501                                 ect->record = i + 1;
2502                                 ect->kl = 0;
2503                                 ect->dl = fdata->blksize;
2504                                 /*
2505                                  * Check for special tracks 0-1
2506                                  * when formatting CDL
2507                                  */
2508                                 if ((intensity & 0x08) &&
2509                                     address.cyl == 0 && address.head == 0) {
2510                                         if (i < 3) {
2511                                                 ect->kl = 4;
2512                                                 ect->dl = sizes_trk0[i] - 4;
2513                                         }
2514                                 }
2515                                 if ((intensity & 0x08) &&
2516                                     address.cyl == 0 && address.head == 1) {
2517                                         ect->kl = 44;
2518                                         ect->dl = LABEL_SIZE - 44;
2519                                 }
2520                                 ccw[-1].flags |= CCW_FLAG_CC;
2521                                 if (i != 0 || j == 0)
2522                                         ccw->cmd_code =
2523                                                 DASD_ECKD_CCW_WRITE_CKD;
2524                                 else
2525                                         ccw->cmd_code =
2526                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2527                                 ccw->flags = CCW_FLAG_SLI;
2528                                 ccw->count = 8;
2529                                         ccw->cda = (__u32)(addr_t) ect;
2530                                         ccw++;
2531                         }
2532                 }
2533         }
2534 
2535         fcp->startdev = startdev;
2536         fcp->memdev = startdev;
2537         fcp->basedev = base;
2538         fcp->retries = 256;
2539         fcp->expires = startdev->default_expires * HZ;
2540         fcp->buildclk = get_tod_clock();
2541         fcp->status = DASD_CQR_FILLED;
2542 
2543         return fcp;
2544 }
2545 
2546 /*
2547  * Wrapper function to build a CCW request depending on input data
2548  */
2549 static struct dasd_ccw_req *
2550 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2551                                struct format_data_t *fdata, int enable_pav,
2552                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2553 {
2554         struct dasd_ccw_req *ccw_req;
2555 
2556         if (!fmt_buffer) {
2557                 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2558         } else {
2559                 if (tpm)
2560                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2561                                                             enable_pav,
2562                                                             fmt_buffer, rpt);
2563                 else
2564                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2565                                                         fmt_buffer, rpt);
2566         }
2567 
2568         return ccw_req;
2569 }
2570 
2571 /*
2572  * Sanity checks on format_data
2573  */
2574 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2575                                           struct format_data_t *fdata)
2576 {
2577         struct dasd_eckd_private *private = base->private;
2578 
2579         if (fdata->start_unit >=
2580             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2581                 dev_warn(&base->cdev->dev,
2582                          "Start track number %u used in formatting is too big\n",
2583                          fdata->start_unit);
2584                 return -EINVAL;
2585         }
2586         if (fdata->stop_unit >=
2587             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2588                 dev_warn(&base->cdev->dev,
2589                          "Stop track number %u used in formatting is too big\n",
2590                          fdata->stop_unit);
2591                 return -EINVAL;
2592         }
2593         if (fdata->start_unit > fdata->stop_unit) {
2594                 dev_warn(&base->cdev->dev,
2595                          "Start track %u used in formatting exceeds end track\n",
2596                          fdata->start_unit);
2597                 return -EINVAL;
2598         }
2599         if (dasd_check_blocksize(fdata->blksize) != 0) {
2600                 dev_warn(&base->cdev->dev,
2601                          "The DASD cannot be formatted with block size %u\n",
2602                          fdata->blksize);
2603                 return -EINVAL;
2604         }
2605         return 0;
2606 }
2607 
2608 /*
2609  * This function will process format_data originally coming from an IOCTL
2610  */
2611 static int dasd_eckd_format_process_data(struct dasd_device *base,
2612                                          struct format_data_t *fdata,
2613                                          int enable_pav, int tpm,
2614                                          struct eckd_count *fmt_buffer, int rpt,
2615                                          struct irb *irb)
2616 {
2617         struct dasd_eckd_private *private = base->private;
2618         struct dasd_ccw_req *cqr, *n;
2619         struct list_head format_queue;
2620         struct dasd_device *device;
2621         char *sense = NULL;
2622         int old_start, old_stop, format_step;
2623         int step, retry;
2624         int rc;
2625 
2626         rc = dasd_eckd_format_sanity_checks(base, fdata);
2627         if (rc)
2628                 return rc;
2629 
2630         INIT_LIST_HEAD(&format_queue);
2631 
2632         old_start = fdata->start_unit;
2633         old_stop = fdata->stop_unit;
2634 
2635         if (!tpm && fmt_buffer != NULL) {
2636                 /* Command Mode / Format Check */
2637                 format_step = 1;
2638         } else if (tpm && fmt_buffer != NULL) {
2639                 /* Transport Mode / Format Check */
2640                 format_step = DASD_CQR_MAX_CCW / rpt;
2641         } else {
2642                 /* Normal Formatting */
2643                 format_step = DASD_CQR_MAX_CCW /
2644                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2645         }
2646 
2647         do {
2648                 retry = 0;
2649                 while (fdata->start_unit <= old_stop) {
2650                         step = fdata->stop_unit - fdata->start_unit + 1;
2651                         if (step > format_step) {
2652                                 fdata->stop_unit =
2653                                         fdata->start_unit + format_step - 1;
2654                         }
2655 
2656                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2657                                                              enable_pav, tpm,
2658                                                              fmt_buffer, rpt);
2659                         if (IS_ERR(cqr)) {
2660                                 rc = PTR_ERR(cqr);
2661                                 if (rc == -ENOMEM) {
2662                                         if (list_empty(&format_queue))
2663                                                 goto out;
2664                                         /*
2665                                          * not enough memory available, start
2666                                          * requests retry after first requests
2667                                          * were finished
2668                                          */
2669                                         retry = 1;
2670                                         break;
2671                                 }
2672                                 goto out_err;
2673                         }
2674                         list_add_tail(&cqr->blocklist, &format_queue);
2675 
2676                         if (fmt_buffer) {
2677                                 step = fdata->stop_unit - fdata->start_unit + 1;
2678                                 fmt_buffer += rpt * step;
2679                         }
2680                         fdata->start_unit = fdata->stop_unit + 1;
2681                         fdata->stop_unit = old_stop;
2682                 }
2683 
2684                 rc = dasd_sleep_on_queue(&format_queue);
2685 
2686 out_err:
2687                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2688                         device = cqr->startdev;
2689                         private = device->private;
2690 
2691                         if (cqr->status == DASD_CQR_FAILED) {
2692                                 /*
2693                                  * Only get sense data if called by format
2694                                  * check
2695                                  */
2696                                 if (fmt_buffer && irb) {
2697                                         sense = dasd_get_sense(&cqr->irb);
2698                                         memcpy(irb, &cqr->irb, sizeof(*irb));
2699                                 }
2700                                 rc = -EIO;
2701                         }
2702                         list_del_init(&cqr->blocklist);
2703                         dasd_sfree_request(cqr, device);
2704                         private->count--;
2705                 }
2706 
2707                 if (rc && rc != -EIO)
2708                         goto out;
2709                 if (rc == -EIO) {
2710                         /*
2711                          * In case fewer than the expected records are on the
2712                          * track, we will most likely get a 'No Record Found'
2713                          * error (in command mode) or a 'File Protected' error
2714                          * (in transport mode). Those particular cases shouldn't
2715                          * pass the -EIO to the IOCTL, therefore reset the rc
2716                          * and continue.
2717                          */
2718                         if (sense &&
2719                             (sense[1] & SNS1_NO_REC_FOUND ||
2720                              sense[1] & SNS1_FILE_PROTECTED))
2721                                 retry = 1;
2722                         else
2723                                 goto out;
2724                 }
2725 
2726         } while (retry);
2727 
2728 out:
2729         fdata->start_unit = old_start;
2730         fdata->stop_unit = old_stop;
2731 
2732         return rc;
2733 }
2734 
2735 static int dasd_eckd_format_device(struct dasd_device *base,
2736                                    struct format_data_t *fdata, int enable_pav)
2737 {
2738         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2739                                              0, NULL);
2740 }
2741 
2742 /*
2743  * Helper function to count consecutive records of a single track.
2744  */
2745 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2746                                    int max)
2747 {
2748         int head;
2749         int i;
2750 
2751         head = fmt_buffer[start].head;
2752 
2753         /*
2754          * There are 3 conditions where we stop counting:
2755          * - if data reoccurs (same head and record may reoccur), which may
2756          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
2757          * - when the head changes, because we're iterating over several tracks
2758          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
2759          * - when we've reached the end of sensible data in the buffer (the
2760          *   record will be 0 then)
2761          */
2762         for (i = start; i < max; i++) {
2763                 if (i > start) {
2764                         if ((fmt_buffer[i].head == head &&
2765                             fmt_buffer[i].record == 1) ||
2766                             fmt_buffer[i].head != head ||
2767                             fmt_buffer[i].record == 0)
2768                                 break;
2769                 }
2770         }
2771 
2772         return i - start;
2773 }
2774 
2775 /*
2776  * Evaluate a given range of tracks. Data like number of records, blocksize,
2777  * record ids, and key length are compared with expected data.
2778  *
2779  * If a mismatch occurs, the corresponding error bit is set, as well as
2780  * additional information, depending on the error.
2781  */
2782 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2783                                              struct format_check_t *cdata,
2784                                              int rpt_max, int rpt_exp,
2785                                              int trk_per_cyl, int tpm)
2786 {
2787         struct ch_t geo;
2788         int max_entries;
2789         int count = 0;
2790         int trkcount;
2791         int blksize;
2792         int pos = 0;
2793         int i, j;
2794         int kl;
2795 
2796         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2797         max_entries = trkcount * rpt_max;
2798 
2799         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2800                 /* Calculate the correct next starting position in the buffer */
2801                 if (tpm) {
2802                         while (fmt_buffer[pos].record == 0 &&
2803                                fmt_buffer[pos].dl == 0) {
2804                                 if (pos++ > max_entries)
2805                                         break;
2806                         }
2807                 } else {
2808                         if (i != cdata->expect.start_unit)
2809                                 pos += rpt_max - count;
2810                 }
2811 
2812                 /* Calculate the expected geo values for the current track */
2813                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2814 
2815                 /* Count and check number of records */
2816                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2817 
2818                 if (count < rpt_exp) {
2819                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2820                         break;
2821                 }
2822                 if (count > rpt_exp) {
2823                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2824                         break;
2825                 }
2826 
2827                 for (j = 0; j < count; j++, pos++) {
2828                         blksize = cdata->expect.blksize;
2829                         kl = 0;
2830 
2831                         /*
2832                          * Set special values when checking CDL formatted
2833                          * devices.
2834                          */
2835                         if ((cdata->expect.intensity & 0x08) &&
2836                             geo.cyl == 0 && geo.head == 0) {
2837                                 if (j < 3) {
2838                                         blksize = sizes_trk0[j] - 4;
2839                                         kl = 4;
2840                                 }
2841                         }
2842                         if ((cdata->expect.intensity & 0x08) &&
2843                             geo.cyl == 0 && geo.head == 1) {
2844                                 blksize = LABEL_SIZE - 44;
2845                                 kl = 44;
2846                         }
2847 
2848                         /* Check blocksize */
2849                         if (fmt_buffer[pos].dl != blksize) {
2850                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
2851                                 goto out;
2852                         }
2853                         /* Check if key length is 0 */
2854                         if (fmt_buffer[pos].kl != kl) {
2855                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2856                                 goto out;
2857                         }
2858                         /* Check if record_id is correct */
2859                         if (fmt_buffer[pos].cyl != geo.cyl ||
2860                             fmt_buffer[pos].head != geo.head ||
2861                             fmt_buffer[pos].record != (j + 1)) {
2862                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
2863                                 goto out;
2864                         }
2865                 }
2866         }
2867 
2868 out:
2869         /*
2870          * In case of no errors, we need to decrease by one
2871          * to get the correct positions.
2872          */
2873         if (!cdata->result) {
2874                 i--;
2875                 pos--;
2876         }
2877 
2878         cdata->unit = i;
2879         cdata->num_records = count;
2880         cdata->rec = fmt_buffer[pos].record;
2881         cdata->blksize = fmt_buffer[pos].dl;
2882         cdata->key_length = fmt_buffer[pos].kl;
2883 }
2884 
2885 /*
2886  * Check the format of a range of tracks of a DASD.
2887  */
2888 static int dasd_eckd_check_device_format(struct dasd_device *base,
2889                                          struct format_check_t *cdata,
2890                                          int enable_pav)
2891 {
2892         struct dasd_eckd_private *private = base->private;
2893         struct eckd_count *fmt_buffer;
2894         struct irb irb;
2895         int rpt_max, rpt_exp;
2896         int fmt_buffer_size;
2897         int trk_per_cyl;
2898         int trkcount;
2899         int tpm = 0;
2900         int rc;
2901 
2902         trk_per_cyl = private->rdc_data.trk_per_cyl;
2903 
2904         /* Get maximum and expected amount of records per track */
2905         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2906         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2907 
2908         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2909         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2910 
2911         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2912         if (!fmt_buffer)
2913                 return -ENOMEM;
2914 
2915         /*
2916          * A certain FICON feature subset is needed to operate in transport
2917          * mode. Additionally, the support for transport mode is implicitly
2918          * checked by comparing the buffer size with fcx_max_data. As long as
2919          * the buffer size is smaller we can operate in transport mode and
2920          * process multiple tracks. If not, only one track at once is being
2921          * processed using command mode.
2922          */
2923         if ((private->features.feature[40] & 0x04) &&
2924             fmt_buffer_size <= private->fcx_max_data)
2925                 tpm = 1;
2926 
2927         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2928                                            tpm, fmt_buffer, rpt_max, &irb);
2929         if (rc && rc != -EIO)
2930                 goto out;
2931         if (rc == -EIO) {
2932                 /*
2933                  * If our first attempt with transport mode enabled comes back
2934                  * with an incorrect length error, we're going to retry the
2935                  * check with command mode.
2936                  */
2937                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2938                         tpm = 0;
2939                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
2940                                                            enable_pav, tpm,
2941                                                            fmt_buffer, rpt_max,
2942                                                            &irb);
2943                         if (rc)
2944                                 goto out;
2945                 } else {
2946                         goto out;
2947                 }
2948         }
2949 
2950         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2951                                          trk_per_cyl, tpm);
2952 
2953 out:
2954         kfree(fmt_buffer);
2955 
2956         return rc;
2957 }
2958 
2959 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2960 {
2961         if (cqr->retries < 0) {
2962                 cqr->status = DASD_CQR_FAILED;
2963                 return;
2964         }
2965         cqr->status = DASD_CQR_FILLED;
2966         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2967                 dasd_eckd_reset_ccw_to_base_io(cqr);
2968                 cqr->startdev = cqr->block->base;
2969                 cqr->lpm = cqr->block->base->path_data.opm;
2970         }
2971 };
2972 
2973 static dasd_erp_fn_t
2974 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2975 {
2976         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2977         struct ccw_device *cdev = device->cdev;
2978 
2979         switch (cdev->id.cu_type) {
2980         case 0x3990:
2981         case 0x2105:
2982         case 0x2107:
2983         case 0x1750:
2984                 return dasd_3990_erp_action;
2985         case 0x9343:
2986         case 0x3880:
2987         default:
2988                 return dasd_default_erp_action;
2989         }
2990 }
2991 
2992 static dasd_erp_fn_t
2993 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2994 {
2995         return dasd_default_erp_postaction;
2996 }
2997 
2998 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2999                                               struct dasd_ccw_req *cqr,
3000                                               struct irb *irb)
3001 {
3002         char mask;
3003         char *sense = NULL;
3004         struct dasd_eckd_private *private = device->private;
3005 
3006         /* first of all check for state change pending interrupt */
3007         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3008         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3009                 /*
3010                  * for alias only, not in offline processing
3011                  * and only if not suspended
3012                  */
3013                 if (!device->block && private->lcu &&
3014                     device->state == DASD_STATE_ONLINE &&
3015                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3016                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3017                         /* schedule worker to reload device */
3018                         dasd_reload_device(device);
3019                 }
3020                 dasd_generic_handle_state_change(device);
3021                 return;
3022         }
3023 
3024         sense = dasd_get_sense(irb);
3025         if (!sense)
3026                 return;
3027 
3028         /* summary unit check */
3029         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3030             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3031                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3032                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3033                                       "eckd suc: device already notified");
3034                         return;
3035                 }
3036                 sense = dasd_get_sense(irb);
3037                 if (!sense) {
3038                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3039                                       "eckd suc: no reason code available");
3040                         clear_bit(DASD_FLAG_SUC, &device->flags);
3041                         return;
3042 
3043                 }
3044                 private->suc_reason = sense[8];
3045                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3046                               "eckd handle summary unit check: reason",
3047                               private->suc_reason);
3048                 dasd_get_device(device);
3049                 if (!schedule_work(&device->suc_work))
3050                         dasd_put_device(device);
3051 
3052                 return;
3053         }
3054 
3055         /* service information message SIM */
3056         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3057             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3058                 dasd_3990_erp_handle_sim(device, sense);
3059                 return;
3060         }
3061 
3062         /* loss of device reservation is handled via base devices only
3063          * as alias devices may be used with several bases
3064          */
3065         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3066             (sense[7] == 0x3F) &&
3067             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3068             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3069                 if (device->features & DASD_FEATURE_FAILONSLCK)
3070                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3071                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3072                 dev_err(&device->cdev->dev,
3073                         "The device reservation was lost\n");
3074         }
3075 }
3076 
3077 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3078                                                struct dasd_device *startdev,
3079                                                struct dasd_block *block,
3080                                                struct request *req,
3081                                                sector_t first_rec,
3082                                                sector_t last_rec,
3083                                                sector_t first_trk,
3084                                                sector_t last_trk,
3085                                                unsigned int first_offs,
3086                                                unsigned int last_offs,
3087                                                unsigned int blk_per_trk,
3088                                                unsigned int blksize)
3089 {
3090         struct dasd_eckd_private *private;
3091         unsigned long *idaws;
3092         struct LO_eckd_data *LO_data;
3093         struct dasd_ccw_req *cqr;
3094         struct ccw1 *ccw;
3095         struct req_iterator iter;
3096         struct bio_vec bv;
3097         char *dst;
3098         unsigned int off;
3099         int count, cidaw, cplength, datasize;
3100         sector_t recid;
3101         unsigned char cmd, rcmd;
3102         int use_prefix;
3103         struct dasd_device *basedev;
3104 
3105         basedev = block->base;
3106         private = basedev->private;
3107         if (rq_data_dir(req) == READ)
3108                 cmd = DASD_ECKD_CCW_READ_MT;
3109         else if (rq_data_dir(req) == WRITE)
3110                 cmd = DASD_ECKD_CCW_WRITE_MT;
3111         else
3112                 return ERR_PTR(-EINVAL);
3113 
3114         /* Check struct bio and count the number of blocks for the request. */
3115         count = 0;
3116         cidaw = 0;
3117         rq_for_each_segment(bv, req, iter) {
3118                 if (bv.bv_len & (blksize - 1))
3119                         /* Eckd can only do full blocks. */
3120                         return ERR_PTR(-EINVAL);
3121                 count += bv.bv_len >> (block->s2b_shift + 9);
3122                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3123                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3124         }
3125         /* Paranoia. */
3126         if (count != last_rec - first_rec + 1)
3127                 return ERR_PTR(-EINVAL);
3128 
3129         /* use the prefix command if available */
3130         use_prefix = private->features.feature[8] & 0x01;
3131         if (use_prefix) {
3132                 /* 1x prefix + number of blocks */
3133                 cplength = 2 + count;
3134                 /* 1x prefix + cidaws*sizeof(long) */
3135                 datasize = sizeof(struct PFX_eckd_data) +
3136                         sizeof(struct LO_eckd_data) +
3137                         cidaw * sizeof(unsigned long);
3138         } else {
3139                 /* 1x define extent + 1x locate record + number of blocks */
3140                 cplength = 2 + count;
3141                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3142                 datasize = sizeof(struct DE_eckd_data) +
3143                         sizeof(struct LO_eckd_data) +
3144                         cidaw * sizeof(unsigned long);
3145         }
3146         /* Find out the number of additional locate record ccws for cdl. */
3147         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3148                 if (last_rec >= 2*blk_per_trk)
3149                         count = 2*blk_per_trk - first_rec;
3150                 cplength += count;
3151                 datasize += count*sizeof(struct LO_eckd_data);
3152         }
3153         /* Allocate the ccw request. */
3154         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3155                                    startdev);
3156         if (IS_ERR(cqr))
3157                 return cqr;
3158         ccw = cqr->cpaddr;
3159         /* First ccw is define extent or prefix. */
3160         if (use_prefix) {
3161                 if (prefix(ccw++, cqr->data, first_trk,
3162                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3163                         /* Clock not in sync and XRC is enabled.
3164                          * Try again later.
3165                          */
3166                         dasd_sfree_request(cqr, startdev);
3167                         return ERR_PTR(-EAGAIN);
3168                 }
3169                 idaws = (unsigned long *) (cqr->data +
3170                                            sizeof(struct PFX_eckd_data));
3171         } else {
3172                 if (define_extent(ccw++, cqr->data, first_trk,
3173                                   last_trk, cmd, basedev) == -EAGAIN) {
3174                         /* Clock not in sync and XRC is enabled.
3175                          * Try again later.
3176                          */
3177                         dasd_sfree_request(cqr, startdev);
3178                         return ERR_PTR(-EAGAIN);
3179                 }
3180                 idaws = (unsigned long *) (cqr->data +
3181                                            sizeof(struct DE_eckd_data));
3182         }
3183         /* Build locate_record+read/write/ccws. */
3184         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3185         recid = first_rec;
3186         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3187                 /* Only standard blocks so there is just one locate record. */
3188                 ccw[-1].flags |= CCW_FLAG_CC;
3189                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3190                               last_rec - recid + 1, cmd, basedev, blksize);
3191         }
3192         rq_for_each_segment(bv, req, iter) {
3193                 dst = page_address(bv.bv_page) + bv.bv_offset;
3194                 if (dasd_page_cache) {
3195                         char *copy = kmem_cache_alloc(dasd_page_cache,
3196                                                       GFP_DMA | __GFP_NOWARN);
3197                         if (copy && rq_data_dir(req) == WRITE)
3198                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3199                         if (copy)
3200                                 dst = copy + bv.bv_offset;
3201                 }
3202                 for (off = 0; off < bv.bv_len; off += blksize) {
3203                         sector_t trkid = recid;
3204                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
3205                         rcmd = cmd;
3206                         count = blksize;
3207                         /* Locate record for cdl special block ? */
3208                         if (private->uses_cdl && recid < 2*blk_per_trk) {
3209                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3210                                         rcmd |= 0x8;
3211                                         count = dasd_eckd_cdl_reclen(recid);
3212                                         if (count < blksize &&
3213                                             rq_data_dir(req) == READ)
3214                                                 memset(dst + count, 0xe5,
3215                                                        blksize - count);
3216                                 }
3217                                 ccw[-1].flags |= CCW_FLAG_CC;
3218                                 locate_record(ccw++, LO_data++,
3219                                               trkid, recoffs + 1,
3220                                               1, rcmd, basedev, count);
3221                         }
3222                         /* Locate record for standard blocks ? */
3223                         if (private->uses_cdl && recid == 2*blk_per_trk) {
3224                                 ccw[-1].flags |= CCW_FLAG_CC;
3225                                 locate_record(ccw++, LO_data++,
3226                                               trkid, recoffs + 1,
3227                                               last_rec - recid + 1,
3228                                               cmd, basedev, count);
3229                         }
3230                         /* Read/write ccw. */
3231                         ccw[-1].flags |= CCW_FLAG_CC;
3232                         ccw->cmd_code = rcmd;
3233                         ccw->count = count;
3234                         if (idal_is_needed(dst, blksize)) {
3235                                 ccw->cda = (__u32)(addr_t) idaws;
3236                                 ccw->flags = CCW_FLAG_IDA;
3237                                 idaws = idal_create_words(idaws, dst, blksize);
3238                         } else {
3239                                 ccw->cda = (__u32)(addr_t) dst;
3240                                 ccw->flags = 0;
3241                         }
3242                         ccw++;
3243                         dst += blksize;
3244                         recid++;
3245                 }
3246         }
3247         if (blk_noretry_request(req) ||
3248             block->base->features & DASD_FEATURE_FAILFAST)
3249                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3250         cqr->startdev = startdev;
3251         cqr->memdev = startdev;
3252         cqr->block = block;
3253         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3254         cqr->lpm = startdev->path_data.ppm;
3255         cqr->retries = startdev->default_retries;
3256         cqr->buildclk = get_tod_clock();
3257         cqr->status = DASD_CQR_FILLED;
3258         return cqr;
3259 }
3260 
3261 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3262                                                struct dasd_device *startdev,
3263                                                struct dasd_block *block,
3264                                                struct request *req,
3265                                                sector_t first_rec,
3266                                                sector_t last_rec,
3267                                                sector_t first_trk,
3268                                                sector_t last_trk,
3269                                                unsigned int first_offs,
3270                                                unsigned int last_offs,
3271                                                unsigned int blk_per_trk,
3272                                                unsigned int blksize)
3273 {
3274         unsigned long *idaws;
3275         struct dasd_ccw_req *cqr;
3276         struct ccw1 *ccw;
3277         struct req_iterator iter;
3278         struct bio_vec bv;
3279         char *dst, *idaw_dst;
3280         unsigned int cidaw, cplength, datasize;
3281         unsigned int tlf;
3282         sector_t recid;
3283         unsigned char cmd;
3284         struct dasd_device *basedev;
3285         unsigned int trkcount, count, count_to_trk_end;
3286         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3287         unsigned char new_track, end_idaw;
3288         sector_t trkid;
3289         unsigned int recoffs;
3290 
3291         basedev = block->base;
3292         if (rq_data_dir(req) == READ)
3293                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3294         else if (rq_data_dir(req) == WRITE)
3295                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3296         else
3297                 return ERR_PTR(-EINVAL);
3298 
3299         /* Track based I/O needs IDAWs for each page, and not just for
3300          * 64 bit addresses. We need additional idals for pages
3301          * that get filled from two tracks, so we use the number
3302          * of records as upper limit.
3303          */
3304         cidaw = last_rec - first_rec + 1;
3305         trkcount = last_trk - first_trk + 1;
3306 
3307         /* 1x prefix + one read/write ccw per track */
3308         cplength = 1 + trkcount;
3309 
3310         /* on 31-bit we need space for two 32 bit addresses per page
3311          * on 64-bit one 64 bit address
3312          */
3313         datasize = sizeof(struct PFX_eckd_data) +
3314                 cidaw * sizeof(unsigned long long);
3315 
3316         /* Allocate the ccw request. */
3317         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3318                                    startdev);
3319         if (IS_ERR(cqr))
3320                 return cqr;
3321         ccw = cqr->cpaddr;
3322         /* transfer length factor: how many bytes to read from the last track */
3323         if (first_trk == last_trk)
3324                 tlf = last_offs - first_offs + 1;
3325         else
3326                 tlf = last_offs + 1;
3327         tlf *= blksize;
3328 
3329         if (prefix_LRE(ccw++, cqr->data, first_trk,
3330                        last_trk, cmd, basedev, startdev,
3331                        1 /* format */, first_offs + 1,
3332                        trkcount, blksize,
3333                        tlf) == -EAGAIN) {
3334                 /* Clock not in sync and XRC is enabled.
3335                  * Try again later.
3336                  */
3337                 dasd_sfree_request(cqr, startdev);
3338                 return ERR_PTR(-EAGAIN);
3339         }
3340 
3341         /*
3342          * The translation of request into ccw programs must meet the
3343          * following conditions:
3344          * - all idaws but the first and the last must address full pages
3345          *   (or 2K blocks on 31-bit)
3346          * - the scope of a ccw and it's idal ends with the track boundaries
3347          */
3348         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3349         recid = first_rec;
3350         new_track = 1;
3351         end_idaw = 0;
3352         len_to_track_end = 0;
3353         idaw_dst = NULL;
3354         idaw_len = 0;
3355         rq_for_each_segment(bv, req, iter) {
3356                 dst = page_address(bv.bv_page) + bv.bv_offset;
3357                 seg_len = bv.bv_len;
3358                 while (seg_len) {
3359                         if (new_track) {
3360                                 trkid = recid;
3361                                 recoffs = sector_div(trkid, blk_per_trk);
3362                                 count_to_trk_end = blk_per_trk - recoffs;
3363                                 count = min((last_rec - recid + 1),
3364                                             (sector_t)count_to_trk_end);
3365                                 len_to_track_end = count * blksize;
3366                                 ccw[-1].flags |= CCW_FLAG_CC;
3367                                 ccw->cmd_code = cmd;
3368                                 ccw->count = len_to_track_end;
3369                                 ccw->cda = (__u32)(addr_t)idaws;
3370                                 ccw->flags = CCW_FLAG_IDA;
3371                                 ccw++;
3372                                 recid += count;
3373                                 new_track = 0;
3374                                 /* first idaw for a ccw may start anywhere */
3375                                 if (!idaw_dst)
3376                                         idaw_dst = dst;
3377                         }
3378                         /* If we start a new idaw, we must make sure that it
3379                          * starts on an IDA_BLOCK_SIZE boundary.
3380                          * If we continue an idaw, we must make sure that the
3381                          * current segment begins where the so far accumulated
3382                          * idaw ends
3383                          */
3384                         if (!idaw_dst) {
3385                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3386                                         dasd_sfree_request(cqr, startdev);
3387                                         return ERR_PTR(-ERANGE);
3388                                 } else
3389                                         idaw_dst = dst;
3390                         }
3391                         if ((idaw_dst + idaw_len) != dst) {
3392                                 dasd_sfree_request(cqr, startdev);
3393                                 return ERR_PTR(-ERANGE);
3394                         }
3395                         part_len = min(seg_len, len_to_track_end);
3396                         seg_len -= part_len;
3397                         dst += part_len;
3398                         idaw_len += part_len;
3399                         len_to_track_end -= part_len;
3400                         /* collected memory area ends on an IDA_BLOCK border,
3401                          * -> create an idaw
3402                          * idal_create_words will handle cases where idaw_len
3403                          * is larger then IDA_BLOCK_SIZE
3404                          */
3405                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3406                                 end_idaw = 1;
3407                         /* We also need to end the idaw at track end */
3408                         if (!len_to_track_end) {
3409                                 new_track = 1;
3410                                 end_idaw = 1;
3411                         }
3412                         if (end_idaw) {
3413                                 idaws = idal_create_words(idaws, idaw_dst,
3414                                                           idaw_len);
3415                                 idaw_dst = NULL;
3416                                 idaw_len = 0;
3417                                 end_idaw = 0;
3418                         }
3419                 }
3420         }
3421 
3422         if (blk_noretry_request(req) ||
3423             block->base->features & DASD_FEATURE_FAILFAST)
3424                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3425         cqr->startdev = startdev;
3426         cqr->memdev = startdev;
3427         cqr->block = block;
3428         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3429         cqr->lpm = startdev->path_data.ppm;
3430         cqr->retries = startdev->default_retries;
3431         cqr->buildclk = get_tod_clock();
3432         cqr->status = DASD_CQR_FILLED;
3433         return cqr;
3434 }
3435 
3436 static int prepare_itcw(struct itcw *itcw,
3437                         unsigned int trk, unsigned int totrk, int cmd,
3438                         struct dasd_device *basedev,
3439                         struct dasd_device *startdev,
3440                         unsigned int rec_on_trk, int count,
3441                         unsigned int blksize,
3442                         unsigned int total_data_size,
3443                         unsigned int tlf,
3444                         unsigned int blk_per_trk)
3445 {
3446         struct PFX_eckd_data pfxdata;
3447         struct dasd_eckd_private *basepriv, *startpriv;
3448         struct DE_eckd_data *dedata;
3449         struct LRE_eckd_data *lredata;
3450         struct dcw *dcw;
3451 
3452         u32 begcyl, endcyl;
3453         u16 heads, beghead, endhead;
3454         u8 pfx_cmd;
3455 
3456         int rc = 0;
3457         int sector = 0;
3458         int dn, d;
3459 
3460 
3461         /* setup prefix data */
3462         basepriv = basedev->private;
3463         startpriv = startdev->private;
3464         dedata = &pfxdata.define_extent;
3465         lredata = &pfxdata.locate_record;
3466 
3467         memset(&pfxdata, 0, sizeof(pfxdata));
3468         pfxdata.format = 1; /* PFX with LRE */
3469         pfxdata.base_address = basepriv->ned->unit_addr;
3470         pfxdata.base_lss = basepriv->ned->ID;
3471         pfxdata.validity.define_extent = 1;
3472 
3473         /* private uid is kept up to date, conf_data may be outdated */
3474         if (startpriv->uid.type != UA_BASE_DEVICE) {
3475                 pfxdata.validity.verify_base = 1;
3476                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
3477                         pfxdata.validity.hyper_pav = 1;
3478         }
3479 
3480         switch (cmd) {
3481         case DASD_ECKD_CCW_READ_TRACK_DATA:
3482                 dedata->mask.perm = 0x1;
3483                 dedata->attributes.operation = basepriv->attrib.operation;
3484                 dedata->blk_size = blksize;
3485                 dedata->ga_extended |= 0x42;
3486                 lredata->operation.orientation = 0x0;
3487                 lredata->operation.operation = 0x0C;
3488                 lredata->auxiliary.check_bytes = 0x01;
3489                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3490                 break;
3491         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3492                 dedata->mask.perm = 0x02;
3493                 dedata->attributes.operation = basepriv->attrib.operation;
3494                 dedata->blk_size = blksize;
3495                 rc = check_XRC_on_prefix(&pfxdata, basedev);
3496                 dedata->ga_extended |= 0x42;
3497                 lredata->operation.orientation = 0x0;
3498                 lredata->operation.operation = 0x3F;
3499                 lredata->extended_operation = 0x23;
3500                 lredata->auxiliary.check_bytes = 0x2;
3501                 pfx_cmd = DASD_ECKD_CCW_PFX;
3502                 break;
3503         case DASD_ECKD_CCW_READ_COUNT_MT:
3504                 dedata->mask.perm = 0x1;
3505                 dedata->attributes.operation = DASD_BYPASS_CACHE;
3506                 dedata->ga_extended |= 0x42;
3507                 dedata->blk_size = blksize;
3508                 lredata->operation.orientation = 0x2;
3509                 lredata->operation.operation = 0x16;
3510                 lredata->auxiliary.check_bytes = 0x01;
3511                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3512                 break;
3513         default:
3514                 DBF_DEV_EVENT(DBF_ERR, basedev,
3515                               "prepare itcw, unknown opcode 0x%x", cmd);
3516                 BUG();
3517                 break;
3518         }
3519         if (rc)
3520                 return rc;
3521 
3522         dedata->attributes.mode = 0x3;  /* ECKD */
3523 
3524         heads = basepriv->rdc_data.trk_per_cyl;
3525         begcyl = trk / heads;
3526         beghead = trk % heads;
3527         endcyl = totrk / heads;
3528         endhead = totrk % heads;
3529 
3530         /* check for sequential prestage - enhance cylinder range */
3531         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3532             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3533 
3534                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3535                         endcyl += basepriv->attrib.nr_cyl;
3536                 else
3537                         endcyl = (basepriv->real_cyl - 1);
3538         }
3539 
3540         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3541         set_ch_t(&dedata->end_ext, endcyl, endhead);
3542 
3543         dedata->ep_format = 0x20; /* records per track is valid */
3544         dedata->ep_rec_per_track = blk_per_trk;
3545 
3546         if (rec_on_trk) {
3547                 switch (basepriv->rdc_data.dev_type) {
3548                 case 0x3390:
3549                         dn = ceil_quot(blksize + 6, 232);
3550                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3551                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3552                         break;
3553                 case 0x3380:
3554                         d = 7 + ceil_quot(blksize + 12, 32);
3555                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3556                         break;
3557                 }
3558         }
3559 
3560         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3561                 lredata->auxiliary.length_valid = 0;
3562                 lredata->auxiliary.length_scope = 0;
3563                 lredata->sector = 0xff;
3564         } else {
3565                 lredata->auxiliary.length_valid = 1;
3566                 lredata->auxiliary.length_scope = 1;
3567                 lredata->sector = sector;
3568         }
3569         lredata->auxiliary.imbedded_ccw_valid = 1;
3570         lredata->length = tlf;
3571         lredata->imbedded_ccw = cmd;
3572         lredata->count = count;
3573         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3574         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3575         lredata->search_arg.head = lredata->seek_addr.head;
3576         lredata->search_arg.record = rec_on_trk;
3577 
3578         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3579                      &pfxdata, sizeof(pfxdata), total_data_size);
3580         return PTR_RET(dcw);
3581 }
3582 
3583 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3584                                                struct dasd_device *startdev,
3585                                                struct dasd_block *block,
3586                                                struct request *req,
3587                                                sector_t first_rec,
3588                                                sector_t last_rec,
3589                                                sector_t first_trk,
3590                                                sector_t last_trk,
3591                                                unsigned int first_offs,
3592                                                unsigned int last_offs,
3593                                                unsigned int blk_per_trk,
3594                                                unsigned int blksize)
3595 {
3596         struct dasd_ccw_req *cqr;
3597         struct req_iterator iter;
3598         struct bio_vec bv;
3599         char *dst;
3600         unsigned int trkcount, ctidaw;
3601         unsigned char cmd;
3602         struct dasd_device *basedev;
3603         unsigned int tlf;
3604         struct itcw *itcw;
3605         struct tidaw *last_tidaw = NULL;
3606         int itcw_op;
3607         size_t itcw_size;
3608         u8 tidaw_flags;
3609         unsigned int seg_len, part_len, len_to_track_end;
3610         unsigned char new_track;
3611         sector_t recid, trkid;
3612         unsigned int offs;
3613         unsigned int count, count_to_trk_end;
3614         int ret;
3615 
3616         basedev = block->base;
3617         if (rq_data_dir(req) == READ) {
3618                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3619                 itcw_op = ITCW_OP_READ;
3620         } else if (rq_data_dir(req) == WRITE) {
3621                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3622                 itcw_op = ITCW_OP_WRITE;
3623         } else
3624                 return ERR_PTR(-EINVAL);
3625 
3626         /* trackbased I/O needs address all memory via TIDAWs,
3627          * not just for 64 bit addresses. This allows us to map
3628          * each segment directly to one tidaw.
3629          * In the case of write requests, additional tidaws may
3630          * be needed when a segment crosses a track boundary.
3631          */
3632         trkcount = last_trk - first_trk + 1;
3633         ctidaw = 0;
3634         rq_for_each_segment(bv, req, iter) {
3635                 ++ctidaw;
3636         }
3637         if (rq_data_dir(req) == WRITE)
3638                 ctidaw += (last_trk - first_trk);
3639 
3640         /* Allocate the ccw request. */
3641         itcw_size = itcw_calc_size(0, ctidaw, 0);
3642         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3643         if (IS_ERR(cqr))
3644                 return cqr;
3645 
3646         /* transfer length factor: how many bytes to read from the last track */
3647         if (first_trk == last_trk)
3648                 tlf = last_offs - first_offs + 1;
3649         else
3650                 tlf = last_offs + 1;
3651         tlf *= blksize;
3652 
3653         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3654         if (IS_ERR(itcw)) {
3655                 ret = -EINVAL;
3656                 goto out_error;
3657         }
3658         cqr->cpaddr = itcw_get_tcw(itcw);
3659         if (prepare_itcw(itcw, first_trk, last_trk,
3660                          cmd, basedev, startdev,
3661                          first_offs + 1,
3662                          trkcount, blksize,
3663                          (last_rec - first_rec + 1) * blksize,
3664                          tlf, blk_per_trk) == -EAGAIN) {
3665                 /* Clock not in sync and XRC is enabled.
3666                  * Try again later.
3667                  */
3668                 ret = -EAGAIN;
3669                 goto out_error;
3670         }
3671         len_to_track_end = 0;
3672         /*
3673          * A tidaw can address 4k of memory, but must not cross page boundaries
3674          * We can let the block layer handle this by setting
3675          * blk_queue_segment_boundary to page boundaries and
3676          * blk_max_segment_size to page size when setting up the request queue.
3677          * For write requests, a TIDAW must not cross track boundaries, because
3678          * we have to set the CBC flag on the last tidaw for each track.
3679          */
3680         if (rq_data_dir(req) == WRITE) {
3681                 new_track = 1;
3682                 recid = first_rec;
3683                 rq_for_each_segment(bv, req, iter) {
3684                         dst = page_address(bv.bv_page) + bv.bv_offset;
3685                         seg_len = bv.bv_len;
3686                         while (seg_len) {
3687                                 if (new_track) {
3688                                         trkid = recid;
3689                                         offs = sector_div(trkid, blk_per_trk);
3690                                         count_to_trk_end = blk_per_trk - offs;
3691                                         count = min((last_rec - recid + 1),
3692                                                     (sector_t)count_to_trk_end);
3693                                         len_to_track_end = count * blksize;
3694                                         recid += count;
3695                                         new_track = 0;
3696                                 }
3697                                 part_len = min(seg_len, len_to_track_end);
3698                                 seg_len -= part_len;
3699                                 len_to_track_end -= part_len;
3700                                 /* We need to end the tidaw at track end */
3701                                 if (!len_to_track_end) {
3702                                         new_track = 1;
3703                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3704                                 } else
3705                                         tidaw_flags = 0;
3706                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3707                                                             dst, part_len);
3708                                 if (IS_ERR(last_tidaw)) {
3709                                         ret = -EINVAL;
3710                                         goto out_error;
3711                                 }
3712                                 dst += part_len;
3713                         }
3714                 }
3715         } else {
3716                 rq_for_each_segment(bv, req, iter) {
3717                         dst = page_address(bv.bv_page) + bv.bv_offset;
3718                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3719                                                     dst, bv.bv_len);
3720                         if (IS_ERR(last_tidaw)) {
3721                                 ret = -EINVAL;
3722                                 goto out_error;
3723                         }
3724                 }
3725         }
3726         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3727         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3728         itcw_finalize(itcw);
3729 
3730         if (blk_noretry_request(req) ||
3731             block->base->features & DASD_FEATURE_FAILFAST)
3732                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3733         cqr->cpmode = 1;
3734         cqr->startdev = startdev;
3735         cqr->memdev = startdev;
3736         cqr->block = block;
3737         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3738         cqr->lpm = startdev->path_data.ppm;
3739         cqr->retries = startdev->default_retries;
3740         cqr->buildclk = get_tod_clock();
3741         cqr->status = DASD_CQR_FILLED;
3742         return cqr;
3743 out_error:
3744         dasd_sfree_request(cqr, startdev);
3745         return ERR_PTR(ret);
3746 }
3747 
3748 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3749                                                struct dasd_block *block,
3750                                                struct request *req)
3751 {
3752         int cmdrtd, cmdwtd;
3753         int use_prefix;
3754         int fcx_multitrack;
3755         struct dasd_eckd_private *private;
3756         struct dasd_device *basedev;
3757         sector_t first_rec, last_rec;
3758         sector_t first_trk, last_trk;
3759         unsigned int first_offs, last_offs;
3760         unsigned int blk_per_trk, blksize;
3761         int cdlspecial;
3762         unsigned int data_size;
3763         struct dasd_ccw_req *cqr;
3764 
3765         basedev = block->base;
3766         private = basedev->private;
3767 
3768         /* Calculate number of blocks/records per track. */
3769         blksize = block->bp_block;
3770         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3771         if (blk_per_trk == 0)
3772                 return ERR_PTR(-EINVAL);
3773         /* Calculate record id of first and last block. */
3774         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3775         first_offs = sector_div(first_trk, blk_per_trk);
3776         last_rec = last_trk =
3777                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3778         last_offs = sector_div(last_trk, blk_per_trk);
3779         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3780 
3781         fcx_multitrack = private->features.feature[40] & 0x20;
3782         data_size = blk_rq_bytes(req);
3783         if (data_size % blksize)
3784                 return ERR_PTR(-EINVAL);
3785         /* tpm write request add CBC data on each track boundary */
3786         if (rq_data_dir(req) == WRITE)
3787                 data_size += (last_trk - first_trk) * 4;
3788 
3789         /* is read track data and write track data in command mode supported? */
3790         cmdrtd = private->features.feature[9] & 0x20;
3791         cmdwtd = private->features.feature[12] & 0x40;
3792         use_prefix = private->features.feature[8] & 0x01;
3793 
3794         cqr = NULL;
3795         if (cdlspecial || dasd_page_cache) {
3796                 /* do nothing, just fall through to the cmd mode single case */
3797         } else if ((data_size <= private->fcx_max_data)
3798                    && (fcx_multitrack || (first_trk == last_trk))) {
3799                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3800                                                     first_rec, last_rec,
3801                                                     first_trk, last_trk,
3802                                                     first_offs, last_offs,
3803                                                     blk_per_trk, blksize);
3804                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3805                     (PTR_ERR(cqr) != -ENOMEM))
3806                         cqr = NULL;
3807         } else if (use_prefix &&
3808                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3809                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3810                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3811                                                    first_rec, last_rec,
3812                                                    first_trk, last_trk,
3813                                                    first_offs, last_offs,
3814                                                    blk_per_trk, blksize);
3815                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3816                     (PTR_ERR(cqr) != -ENOMEM))
3817                         cqr = NULL;
3818         }
3819         if (!cqr)
3820                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3821                                                     first_rec, last_rec,
3822                                                     first_trk, last_trk,
3823                                                     first_offs, last_offs,
3824                                                     blk_per_trk, blksize);
3825         return cqr;
3826 }
3827 
3828 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3829                                                struct dasd_block *block,
3830                                                struct request *req)
3831 {
3832         unsigned long *idaws;
3833         struct dasd_device *basedev;
3834         struct dasd_ccw_req *cqr;
3835         struct ccw1 *ccw;
3836         struct req_iterator iter;
3837         struct bio_vec bv;
3838         char *dst;
3839         unsigned char cmd;
3840         unsigned int trkcount;
3841         unsigned int seg_len, len_to_track_end;
3842         unsigned int first_offs;
3843         unsigned int cidaw, cplength, datasize;
3844         sector_t first_trk, last_trk, sectors;
3845         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3846         unsigned int pfx_datasize;
3847 
3848         /*
3849          * raw track access needs to be mutiple of 64k and on 64k boundary
3850          * For read requests we can fix an incorrect alignment by padding
3851          * the request with dummy pages.
3852          */
3853         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3854         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3855                 DASD_RAW_SECTORS_PER_TRACK;
3856         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3857                 DASD_RAW_SECTORS_PER_TRACK;
3858         basedev = block->base;
3859         if ((start_padding_sectors || end_padding_sectors) &&
3860             (rq_data_dir(req) == WRITE)) {
3861                 DBF_DEV_EVENT(DBF_ERR, basedev,
3862                               "raw write not track aligned (%lu,%lu) req %p",
3863                               start_padding_sectors, end_padding_sectors, req);
3864                 cqr = ERR_PTR(-EINVAL);
3865                 goto out;
3866         }
3867 
3868         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3869         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3870                 DASD_RAW_SECTORS_PER_TRACK;
3871         trkcount = last_trk - first_trk + 1;
3872         first_offs = 0;
3873 
3874         if (rq_data_dir(req) == READ)
3875                 cmd = DASD_ECKD_CCW_READ_TRACK;
3876         else if (rq_data_dir(req) == WRITE)
3877                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3878         else {
3879                 cqr = ERR_PTR(-EINVAL);
3880                 goto out;
3881         }
3882 
3883         /*
3884          * Raw track based I/O needs IDAWs for each page,
3885          * and not just for 64 bit addresses.
3886          */
3887         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3888 
3889         /* 1x prefix + one read/write ccw per track */
3890         cplength = 1 + trkcount;
3891 
3892         /*
3893          * struct PFX_eckd_data has up to 2 byte as extended parameter
3894          * this is needed for write full track and has to be mentioned
3895          * separately
3896          * add 8 instead of 2 to keep 8 byte boundary
3897          */
3898         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3899 
3900         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3901 
3902         /* Allocate the ccw request. */
3903         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3904                                    datasize, startdev);
3905         if (IS_ERR(cqr))
3906                 goto out;
3907         ccw = cqr->cpaddr;
3908 
3909         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3910                        basedev, startdev, 1 /* format */, first_offs + 1,
3911                        trkcount, 0, 0) == -EAGAIN) {
3912                 /* Clock not in sync and XRC is enabled.
3913                  * Try again later.
3914                  */
3915                 dasd_sfree_request(cqr, startdev);
3916                 cqr = ERR_PTR(-EAGAIN);
3917                 goto out;
3918         }
3919 
3920         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3921         len_to_track_end = 0;
3922         if (start_padding_sectors) {
3923                 ccw[-1].flags |= CCW_FLAG_CC;
3924                 ccw->cmd_code = cmd;
3925                 /* maximum 3390 track size */
3926                 ccw->count = 57326;
3927                 /* 64k map to one track */
3928                 len_to_track_end = 65536 - start_padding_sectors * 512;
3929                 ccw->cda = (__u32)(addr_t)idaws;
3930                 ccw->flags |= CCW_FLAG_IDA;
3931                 ccw->flags |= CCW_FLAG_SLI;
3932                 ccw++;
3933                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3934                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3935         }
3936         rq_for_each_segment(bv, req, iter) {
3937                 dst = page_address(bv.bv_page) + bv.bv_offset;
3938                 seg_len = bv.bv_len;
3939                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3940                         memset(dst, 0, seg_len);
3941                 if (!len_to_track_end) {
3942                         ccw[-1].flags |= CCW_FLAG_CC;
3943                         ccw->cmd_code = cmd;
3944                         /* maximum 3390 track size */
3945                         ccw->count = 57326;
3946                         /* 64k map to one track */
3947                         len_to_track_end = 65536;
3948                         ccw->cda = (__u32)(addr_t)idaws;
3949                         ccw->flags |= CCW_FLAG_IDA;
3950                         ccw->flags |= CCW_FLAG_SLI;
3951                         ccw++;
3952                 }
3953                 len_to_track_end -= seg_len;
3954                 idaws = idal_create_words(idaws, dst, seg_len);
3955         }
3956         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3957                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3958         if (blk_noretry_request(req) ||
3959             block->base->features & DASD_FEATURE_FAILFAST)
3960                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3961         cqr->startdev = startdev;
3962         cqr->memdev = startdev;
3963         cqr->block = block;
3964         cqr->expires = startdev->default_expires * HZ;
3965         cqr->lpm = startdev->path_data.ppm;
3966         cqr->retries = startdev->default_retries;
3967         cqr->buildclk = get_tod_clock();
3968         cqr->status = DASD_CQR_FILLED;
3969 
3970         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3971                 cqr = NULL;
3972 out:
3973         return cqr;
3974 }
3975 
3976 
3977 static int
3978 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3979 {
3980         struct dasd_eckd_private *private;
3981         struct ccw1 *ccw;
3982         struct req_iterator iter;
3983         struct bio_vec bv;
3984         char *dst, *cda;
3985         unsigned int blksize, blk_per_trk, off;
3986         sector_t recid;
3987         int status;
3988 
3989         if (!dasd_page_cache)
3990                 goto out;
3991         private = cqr->block->base->private;
3992         blksize = cqr->block->bp_block;
3993         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3994         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3995         ccw = cqr->cpaddr;
3996         /* Skip over define extent & locate record. */
3997         ccw++;
3998         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3999                 ccw++;
4000         rq_for_each_segment(bv, req, iter) {
4001                 dst = page_address(bv.bv_page) + bv.bv_offset;
4002                 for (off = 0; off < bv.bv_len; off += blksize) {
4003                         /* Skip locate record. */
4004                         if (private->uses_cdl && recid <= 2*blk_per_trk)
4005                                 ccw++;
4006                         if (dst) {
4007                                 if (ccw->flags & CCW_FLAG_IDA)
4008                                         cda = *((char **)((addr_t) ccw->cda));
4009                                 else
4010                                         cda = (char *)((addr_t) ccw->cda);
4011                                 if (dst != cda) {
4012                                         if (rq_data_dir(req) == READ)
4013                                                 memcpy(dst, cda, bv.bv_len);
4014                                         kmem_cache_free(dasd_page_cache,
4015                                             (void *)((addr_t)cda & PAGE_MASK));
4016                                 }
4017                                 dst = NULL;
4018                         }
4019                         ccw++;
4020                         recid++;
4021                 }
4022         }
4023 out:
4024         status = cqr->status == DASD_CQR_DONE;
4025         dasd_sfree_request(cqr, cqr->memdev);
4026         return status;
4027 }
4028 
4029 /*
4030  * Modify ccw/tcw in cqr so it can be started on a base device.
4031  *
4032  * Note that this is not enough to restart the cqr!
4033  * Either reset cqr->startdev as well (summary unit check handling)
4034  * or restart via separate cqr (as in ERP handling).
4035  */
4036 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4037 {
4038         struct ccw1 *ccw;
4039         struct PFX_eckd_data *pfxdata;
4040         struct tcw *tcw;
4041         struct tccb *tccb;
4042         struct dcw *dcw;
4043 
4044         if (cqr->cpmode == 1) {
4045                 tcw = cqr->cpaddr;
4046                 tccb = tcw_get_tccb(tcw);
4047                 dcw = (struct dcw *)&tccb->tca[0];
4048                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4049                 pfxdata->validity.verify_base = 0;
4050                 pfxdata->validity.hyper_pav = 0;
4051         } else {
4052                 ccw = cqr->cpaddr;
4053                 pfxdata = cqr->data;
4054                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4055                         pfxdata->validity.verify_base = 0;
4056                         pfxdata->validity.hyper_pav = 0;
4057                 }
4058         }
4059 }
4060 
4061 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4062 
4063 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4064                                                      struct dasd_block *block,
4065                                                      struct request *req)
4066 {
4067         struct dasd_eckd_private *private;
4068         struct dasd_device *startdev;
4069         unsigned long flags;
4070         struct dasd_ccw_req *cqr;
4071 
4072         startdev = dasd_alias_get_start_dev(base);
4073         if (!startdev)
4074                 startdev = base;
4075         private = startdev->private;
4076         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4077                 return ERR_PTR(-EBUSY);
4078 
4079         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4080         private->count++;
4081         if ((base->features & DASD_FEATURE_USERAW))
4082                 cqr = dasd_raw_build_cp(startdev, block, req);
4083         else
4084                 cqr = dasd_eckd_build_cp(startdev, block, req);
4085         if (IS_ERR(cqr))
4086                 private->count--;
4087         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4088         return cqr;
4089 }
4090 
4091 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4092                                    struct request *req)
4093 {
4094         struct dasd_eckd_private *private;
4095         unsigned long flags;
4096 
4097         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4098         private = cqr->memdev->private;
4099         private->count--;
4100         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4101         return dasd_eckd_free_cp(cqr, req);
4102 }
4103 
4104 static int
4105 dasd_eckd_fill_info(struct dasd_device * device,
4106                     struct dasd_information2_t * info)
4107 {
4108         struct dasd_eckd_private *private = device->private;
4109 
4110         info->label_block = 2;
4111         info->FBA_layout = private->uses_cdl ? 0 : 1;
4112         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4113         info->characteristics_size = sizeof(private->rdc_data);
4114         memcpy(info->characteristics, &private->rdc_data,
4115                sizeof(private->rdc_data));
4116         info->confdata_size = min((unsigned long)private->conf_len,
4117                                   sizeof(info->configuration_data));
4118         memcpy(info->configuration_data, private->conf_data,
4119                info->confdata_size);
4120         return 0;
4121 }
4122 
4123 /*
4124  * SECTION: ioctl functions for eckd devices.
4125  */
4126 
4127 /*
4128  * Release device ioctl.
4129  * Buils a channel programm to releases a prior reserved
4130  * (see dasd_eckd_reserve) device.
4131  */
4132 static int
4133 dasd_eckd_release(struct dasd_device *device)
4134 {
4135         struct dasd_ccw_req *cqr;
4136         int rc;
4137         struct ccw1 *ccw;
4138         int useglobal;
4139 
4140         if (!capable(CAP_SYS_ADMIN))
4141                 return -EACCES;
4142 
4143         useglobal = 0;
4144         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4145         if (IS_ERR(cqr)) {
4146                 mutex_lock(&dasd_reserve_mutex);
4147                 useglobal = 1;
4148                 cqr = &dasd_reserve_req->cqr;
4149                 memset(cqr, 0, sizeof(*cqr));
4150                 memset(&dasd_reserve_req->ccw, 0,
4151                        sizeof(dasd_reserve_req->ccw));
4152                 cqr->cpaddr = &dasd_reserve_req->ccw;
4153                 cqr->data = &dasd_reserve_req->data;
4154                 cqr->magic = DASD_ECKD_MAGIC;
4155         }
4156         ccw = cqr->cpaddr;
4157         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4158         ccw->flags |= CCW_FLAG_SLI;
4159         ccw->count = 32;
4160         ccw->cda = (__u32)(addr_t) cqr->data;
4161         cqr->startdev = device;
4162         cqr->memdev = device;
4163         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4164         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4165         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4166         cqr->expires = 2 * HZ;
4167         cqr->buildclk = get_tod_clock();
4168         cqr->status = DASD_CQR_FILLED;
4169 
4170         rc = dasd_sleep_on_immediatly(cqr);
4171         if (!rc)
4172                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4173 
4174         if (useglobal)
4175                 mutex_unlock(&dasd_reserve_mutex);
4176         else
4177                 dasd_sfree_request(cqr, cqr->memdev);
4178         return rc;
4179 }
4180 
4181 /*
4182  * Reserve device ioctl.
4183  * Options are set to 'synchronous wait for interrupt' and
4184  * 'timeout the request'. This leads to a terminate IO if
4185  * the interrupt is outstanding for a certain time.
4186  */
4187 static int
4188 dasd_eckd_reserve(struct dasd_device *device)
4189 {
4190         struct dasd_ccw_req *cqr;
4191         int rc;
4192         struct ccw1 *ccw;
4193         int useglobal;
4194 
4195         if (!capable(CAP_SYS_ADMIN))
4196                 return -EACCES;
4197 
4198         useglobal = 0;
4199         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4200         if (IS_ERR(cqr)) {
4201                 mutex_lock(&dasd_reserve_mutex);
4202                 useglobal = 1;
4203                 cqr = &dasd_reserve_req->cqr;
4204                 memset(cqr, 0, sizeof(*cqr));
4205                 memset(&dasd_reserve_req->ccw, 0,
4206                        sizeof(dasd_reserve_req->ccw));
4207                 cqr->cpaddr = &dasd_reserve_req->ccw;
4208                 cqr->data = &dasd_reserve_req->data;
4209                 cqr->magic = DASD_ECKD_MAGIC;
4210         }
4211         ccw = cqr->cpaddr;
4212         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4213         ccw->flags |= CCW_FLAG_SLI;
4214         ccw->count = 32;
4215         ccw->cda = (__u32)(addr_t) cqr->data;
4216         cqr->startdev = device;
4217         cqr->memdev = device;
4218         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4219         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4220         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4221         cqr->expires = 2 * HZ;
4222         cqr->buildclk = get_tod_clock();
4223         cqr->status = DASD_CQR_FILLED;
4224 
4225         rc = dasd_sleep_on_immediatly(cqr);
4226         if (!rc)
4227                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4228 
4229         if (useglobal)
4230                 mutex_unlock(&dasd_reserve_mutex);
4231         else
4232                 dasd_sfree_request(cqr, cqr->memdev);
4233         return rc;
4234 }
4235 
4236 /*
4237  * Steal lock ioctl - unconditional reserve device.
4238  * Buils a channel programm to break a device's reservation.
4239  * (unconditional reserve)
4240  */
4241 static int
4242 dasd_eckd_steal_lock(struct dasd_device *device)
4243 {
4244         struct dasd_ccw_req *cqr;
4245         int rc;
4246         struct ccw1 *ccw;
4247         int useglobal;
4248 
4249         if (!capable(CAP_SYS_ADMIN))
4250                 return -EACCES;
4251 
4252         useglobal = 0;
4253         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4254         if (IS_ERR(cqr)) {
4255                 mutex_lock(&dasd_reserve_mutex);
4256                 useglobal = 1;
4257                 cqr = &dasd_reserve_req->cqr;
4258                 memset(cqr, 0, sizeof(*cqr));
4259                 memset(&dasd_reserve_req->ccw, 0,
4260                        sizeof(dasd_reserve_req->ccw));
4261                 cqr->cpaddr = &dasd_reserve_req->ccw;
4262                 cqr->data = &dasd_reserve_req->data;
4263                 cqr->magic = DASD_ECKD_MAGIC;
4264         }
4265         ccw = cqr->cpaddr;
4266         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4267         ccw->flags |= CCW_FLAG_SLI;
4268         ccw->count = 32;
4269         ccw->cda = (__u32)(addr_t) cqr->data;
4270         cqr->startdev = device;
4271         cqr->memdev = device;
4272         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4273         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4274         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4275         cqr->expires = 2 * HZ;
4276         cqr->buildclk = get_tod_clock();
4277         cqr->status = DASD_CQR_FILLED;
4278 
4279         rc = dasd_sleep_on_immediatly(cqr);
4280         if (!rc)
4281                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4282 
4283         if (useglobal)
4284                 mutex_unlock(&dasd_reserve_mutex);
4285         else
4286                 dasd_sfree_request(cqr, cqr->memdev);
4287         return rc;
4288 }
4289 
4290 /*
4291  * SNID - Sense Path Group ID
4292  * This ioctl may be used in situations where I/O is stalled due to
4293  * a reserve, so if the normal dasd_smalloc_request fails, we use the
4294  * preallocated dasd_reserve_req.
4295  */
4296 static int dasd_eckd_snid(struct dasd_device *device,
4297                           void __user *argp)
4298 {
4299         struct dasd_ccw_req *cqr;
4300         int rc;
4301         struct ccw1 *ccw;
4302         int useglobal;
4303         struct dasd_snid_ioctl_data usrparm;
4304 
4305         if (!capable(CAP_SYS_ADMIN))
4306                 return -EACCES;
4307 
4308         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4309                 return -EFAULT;
4310 
4311         useglobal = 0;
4312         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4313                                    sizeof(struct dasd_snid_data), device);
4314         if (IS_ERR(cqr)) {
4315                 mutex_lock(&dasd_reserve_mutex);
4316                 useglobal = 1;
4317                 cqr = &dasd_reserve_req->cqr;
4318                 memset(cqr, 0, sizeof(*cqr));
4319                 memset(&dasd_reserve_req->ccw, 0,
4320                        sizeof(dasd_reserve_req->ccw));
4321                 cqr->cpaddr = &dasd_reserve_req->ccw;
4322                 cqr->data = &dasd_reserve_req->data;
4323                 cqr->magic = DASD_ECKD_MAGIC;
4324         }
4325         ccw = cqr->cpaddr;
4326         ccw->cmd_code = DASD_ECKD_CCW_SNID;
4327         ccw->flags |= CCW_FLAG_SLI;
4328         ccw->count = 12;
4329         ccw->cda = (__u32)(addr_t) cqr->data;
4330         cqr->startdev = device;
4331         cqr->memdev = device;
4332         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4333         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4334         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4335         cqr->retries = 5;
4336         cqr->expires = 10 * HZ;
4337         cqr->buildclk = get_tod_clock();
4338         cqr->status = DASD_CQR_FILLED;
4339         cqr->lpm = usrparm.path_mask;
4340 
4341         rc = dasd_sleep_on_immediatly(cqr);
4342         /* verify that I/O processing didn't modify the path mask */
4343         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4344                 rc = -EIO;
4345         if (!rc) {
4346                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4347                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4348                         rc = -EFAULT;
4349         }
4350 
4351         if (useglobal)
4352                 mutex_unlock(&dasd_reserve_mutex);
4353         else
4354                 dasd_sfree_request(cqr, cqr->memdev);
4355         return rc;
4356 }
4357 
4358 /*
4359  * Read performance statistics
4360  */
4361 static int
4362 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4363 {
4364         struct dasd_psf_prssd_data *prssdp;
4365         struct dasd_rssd_perf_stats_t *stats;
4366         struct dasd_ccw_req *cqr;
4367         struct ccw1 *ccw;
4368         int rc;
4369 
4370         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
4371                                    (sizeof(struct dasd_psf_prssd_data) +
4372                                     sizeof(struct dasd_rssd_perf_stats_t)),
4373                                    device);
4374         if (IS_ERR(cqr)) {
4375                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4376                             "Could not allocate initialization request");
4377                 return PTR_ERR(cqr);
4378         }
4379         cqr->startdev = device;
4380         cqr->memdev = device;
4381         cqr->retries = 0;
4382         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4383         cqr->expires = 10 * HZ;
4384 
4385         /* Prepare for Read Subsystem Data */
4386         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4387         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4388         prssdp->order = PSF_ORDER_PRSSD;
4389         prssdp->suborder = 0x01;        /* Performance Statistics */
4390         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
4391 
4392         ccw = cqr->cpaddr;
4393         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4394         ccw->count = sizeof(struct dasd_psf_prssd_data);
4395         ccw->flags |= CCW_FLAG_CC;
4396         ccw->cda = (__u32)(addr_t) prssdp;
4397 
4398         /* Read Subsystem Data - Performance Statistics */
4399         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4400         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4401 
4402         ccw++;
4403         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4404         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4405         ccw->cda = (__u32)(addr_t) stats;
4406 
4407         cqr->buildclk = get_tod_clock();
4408         cqr->status = DASD_CQR_FILLED;
4409         rc = dasd_sleep_on(cqr);
4410         if (rc == 0) {
4411                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4412                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4413                 if (copy_to_user(argp, stats,
4414                                  sizeof(struct dasd_rssd_perf_stats_t)))
4415                         rc = -EFAULT;
4416         }
4417         dasd_sfree_request(cqr, cqr->memdev);
4418         return rc;
4419 }
4420 
4421 /*
4422  * Get attributes (cache operations)
4423  * Returnes the cache attributes used in Define Extend (DE).
4424  */
4425 static int
4426 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4427 {
4428         struct dasd_eckd_private *private = device->private;
4429         struct attrib_data_t attrib = private->attrib;
4430         int rc;
4431 
4432         if (!capable(CAP_SYS_ADMIN))
4433                 return -EACCES;
4434         if (!argp)
4435                 return -EINVAL;
4436 
4437         rc = 0;
4438         if (copy_to_user(argp, (long *) &attrib,
4439                          sizeof(struct attrib_data_t)))
4440                 rc = -EFAULT;
4441 
4442         return rc;
4443 }
4444 
4445 /*
4446  * Set attributes (cache operations)
4447  * Stores the attributes for cache operation to be used in Define Extend (DE).
4448  */
4449 static int
4450 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4451 {
4452         struct dasd_eckd_private *private = device->private;
4453         struct attrib_data_t attrib;
4454 
4455         if (!capable(CAP_SYS_ADMIN))
4456                 return -EACCES;
4457         if (!argp)
4458                 return -EINVAL;
4459 
4460         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4461                 return -EFAULT;
4462         private->attrib = attrib;
4463 
4464         dev_info(&device->cdev->dev,
4465                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4466                  private->attrib.operation, private->attrib.nr_cyl);
4467         return 0;
4468 }
4469 
4470 /*
4471  * Issue syscall I/O to EMC Symmetrix array.
4472  * CCWs are PSF and RSSD
4473  */
4474 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4475 {
4476         struct dasd_symmio_parms usrparm;
4477         char *psf_data, *rssd_result;
4478         struct dasd_ccw_req *cqr;
4479         struct ccw1 *ccw;
4480         char psf0, psf1;
4481         int rc;
4482 
4483         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4484                 return -EACCES;
4485         psf0 = psf1 = 0;
4486 
4487         /* Copy parms from caller */
4488         rc = -EFAULT;
4489         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4490                 goto out;
4491         if (is_compat_task()) {
4492                 /* Make sure pointers are sane even on 31 bit. */
4493                 rc = -EINVAL;
4494                 if ((usrparm.psf_data >> 32) != 0)
4495                         goto out;
4496                 if ((usrparm.rssd_result >> 32) != 0)
4497                         goto out;
4498                 usrparm.psf_data &= 0x7fffffffULL;
4499                 usrparm.rssd_result &= 0x7fffffffULL;
4500         }
4501         /* alloc I/O data area */
4502         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4503         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4504         if (!psf_data || !rssd_result) {
4505                 rc = -ENOMEM;
4506                 goto out_free;
4507         }
4508 
4509         /* get syscall header from user space */
4510         rc = -EFAULT;
4511         if (copy_from_user(psf_data,
4512                            (void __user *)(unsigned long) usrparm.psf_data,
4513                            usrparm.psf_data_len))
4514                 goto out_free;
4515         psf0 = psf_data[0];
4516         psf1 = psf_data[1];
4517 
4518         /* setup CCWs for PSF + RSSD */
4519         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4520         if (IS_ERR(cqr)) {
4521                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4522                         "Could not allocate initialization request");
4523                 rc = PTR_ERR(cqr);
4524                 goto out_free;
4525         }
4526 
4527         cqr->startdev = device;
4528         cqr->memdev = device;
4529         cqr->retries = 3;
4530         cqr->expires = 10 * HZ;
4531         cqr->buildclk = get_tod_clock();
4532         cqr->status = DASD_CQR_FILLED;
4533 
4534         /* Build the ccws */
4535         ccw = cqr->cpaddr;
4536 
4537         /* PSF ccw */
4538         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4539         ccw->count = usrparm.psf_data_len;
4540         ccw->flags |= CCW_FLAG_CC;
4541         ccw->cda = (__u32)(addr_t) psf_data;
4542 
4543         ccw++;
4544 
4545         /* RSSD ccw  */
4546         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4547         ccw->count = usrparm.rssd_result_len;
4548         ccw->flags = CCW_FLAG_SLI ;
4549         ccw->cda = (__u32)(addr_t) rssd_result;
4550 
4551         rc = dasd_sleep_on(cqr);
4552         if (rc)
4553                 goto out_sfree;
4554 
4555         rc = -EFAULT;
4556         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4557                            rssd_result, usrparm.rssd_result_len))
4558                 goto out_sfree;
4559         rc = 0;
4560 
4561 out_sfree:
4562         dasd_sfree_request(cqr, cqr->memdev);
4563 out_free:
4564         kfree(rssd_result);
4565         kfree(psf_data);
4566 out:
4567         DBF_DEV_EVENT(DBF_WARNING, device,
4568                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4569                       (int) psf0, (int) psf1, rc);
4570         return rc;
4571 }
4572 
4573 static int
4574 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4575 {
4576         struct dasd_device *device = block->base;
4577 
4578         switch (cmd) {
4579         case BIODASDGATTR:
4580                 return dasd_eckd_get_attrib(device, argp);
4581         case BIODASDSATTR:
4582                 return dasd_eckd_set_attrib(device, argp);
4583         case BIODASDPSRD:
4584                 return dasd_eckd_performance(device, argp);
4585         case BIODASDRLSE:
4586                 return dasd_eckd_release(device);
4587         case BIODASDRSRV:
4588                 return dasd_eckd_reserve(device);
4589         case BIODASDSLCK:
4590                 return dasd_eckd_steal_lock(device);
4591         case BIODASDSNID:
4592                 return dasd_eckd_snid(device, argp);
4593         case BIODASDSYMMIO:
4594                 return dasd_symm_io(device, argp);
4595         default:
4596                 return -ENOTTY;
4597         }
4598 }
4599 
4600 /*
4601  * Dump the range of CCWs into 'page' buffer
4602  * and return number of printed chars.
4603  */
4604 static int
4605 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4606 {
4607         int len, count;
4608         char *datap;
4609 
4610         len = 0;
4611         while (from <= to) {
4612                 len += sprintf(page + len, PRINTK_HEADER
4613                                " CCW %p: %08X %08X DAT:",
4614                                from, ((int *) from)[0], ((int *) from)[1]);
4615 
4616                 /* get pointer to data (consider IDALs) */
4617                 if (from->flags & CCW_FLAG_IDA)
4618                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4619                 else
4620                         datap = (char *) ((addr_t) from->cda);
4621 
4622                 /* dump data (max 32 bytes) */
4623                 for (count = 0; count < from->count && count < 32; count++) {
4624                         if (count % 8 == 0) len += sprintf(page + len, " ");
4625                         if (count % 4 == 0) len += sprintf(page + len, " ");
4626                         len += sprintf(page + len, "%02x", datap[count]);
4627                 }
4628                 len += sprintf(page + len, "\n");
4629                 from++;
4630         }
4631         return len;
4632 }
4633 
4634 static void
4635 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4636                          char *reason)
4637 {
4638         u64 *sense;
4639         u64 *stat;
4640 
4641         sense = (u64 *) dasd_get_sense(irb);
4642         stat = (u64 *) &irb->scsw;
4643         if (sense) {
4644                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4645                               "%016llx %016llx %016llx %016llx",
4646                               reason, *stat, *((u32 *) (stat + 1)),
4647                               sense[0], sense[1], sense[2], sense[3]);
4648         } else {
4649                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4650                               reason, *stat, *((u32 *) (stat + 1)),
4651                               "NO VALID SENSE");
4652         }
4653 }
4654 
4655 /*
4656  * Print sense data and related channel program.
4657  * Parts are printed because printk buffer is only 1024 bytes.
4658  */
4659 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4660                                  struct dasd_ccw_req *req, struct irb *irb)
4661 {
4662         char *page;
4663         struct ccw1 *first, *last, *fail, *from, *to;
4664         int len, sl, sct;
4665 
4666         page = (char *) get_zeroed_page(GFP_ATOMIC);
4667         if (page == NULL) {
4668                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4669                               "No memory to dump sense data\n");
4670                 return;
4671         }
4672         /* dump the sense data */
4673         len = sprintf(page, PRINTK_HEADER
4674                       " I/O status report for device %s:\n",
4675                       dev_name(&device->cdev->dev));
4676         len += sprintf(page + len, PRINTK_HEADER
4677                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4678                        "CS:%02X RC:%d\n",
4679                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4680                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4681                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4682                        req ? req->intrc : 0);
4683         len += sprintf(page + len, PRINTK_HEADER
4684                        " device %s: Failing CCW: %p\n",
4685                        dev_name(&device->cdev->dev),
4686                        (void *) (addr_t) irb->scsw.cmd.cpa);
4687         if (irb->esw.esw0.erw.cons) {
4688                 for (sl = 0; sl < 4; sl++) {
4689                         len += sprintf(page + len, PRINTK_HEADER
4690                                        " Sense(hex) %2d-%2d:",
4691                                        (8 * sl), ((8 * sl) + 7));
4692 
4693                         for (sct = 0; sct < 8; sct++) {
4694                                 len += sprintf(page + len, " %02x",
4695                                                irb->ecw[8 * sl + sct]);
4696                         }
4697                         len += sprintf(page + len, "\n");
4698                 }
4699 
4700                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4701                         /* 24 Byte Sense Data */
4702                         sprintf(page + len, PRINTK_HEADER
4703                                 " 24 Byte: %x MSG %x, "
4704                                 "%s MSGb to SYSOP\n",
4705                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4706                                 irb->ecw[1] & 0x10 ? "" : "no");
4707                 } else {
4708                         /* 32 Byte Sense Data */
4709                         sprintf(page + len, PRINTK_HEADER
4710                                 " 32 Byte: Format: %x "
4711                                 "Exception class %x\n",
4712                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4713                 }
4714         } else {
4715                 sprintf(page + len, PRINTK_HEADER
4716                         " SORRY - NO VALID SENSE AVAILABLE\n");
4717         }
4718         printk(KERN_ERR "%s", page);
4719 
4720         if (req) {
4721                 /* req == NULL for unsolicited interrupts */
4722                 /* dump the Channel Program (max 140 Bytes per line) */
4723                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4724                 first = req->cpaddr;
4725                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4726                 to = min(first + 6, last);
4727                 len = sprintf(page, PRINTK_HEADER
4728                               " Related CP in req: %p\n", req);
4729                 dasd_eckd_dump_ccw_range(first, to, page + len);
4730                 printk(KERN_ERR "%s", page);
4731 
4732                 /* print failing CCW area (maximum 4) */
4733                 /* scsw->cda is either valid or zero  */
4734                 len = 0;
4735                 from = ++to;
4736                 fail = (struct ccw1 *)(addr_t)
4737                                 irb->scsw.cmd.cpa; /* failing CCW */
4738                 if (from <  fail - 2) {
4739                         from = fail - 2;     /* there is a gap - print header */
4740                         len += sprintf(page, PRINTK_HEADER "......\n");
4741                 }
4742                 to = min(fail + 1, last);
4743                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4744 
4745                 /* print last CCWs (maximum 2) */
4746                 from = max(from, ++to);
4747                 if (from < last - 1) {
4748                         from = last - 1;     /* there is a gap - print header */
4749                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4750                 }
4751                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4752                 if (len > 0)
4753                         printk(KERN_ERR "%s", page);
4754         }
4755         free_page((unsigned long) page);
4756 }
4757 
4758 
4759 /*
4760  * Print sense data from a tcw.
4761  */
4762 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4763                                  struct dasd_ccw_req *req, struct irb *irb)
4764 {
4765         char *page;
4766         int len, sl, sct, residual;
4767         struct tsb *tsb;
4768         u8 *sense, *rcq;
4769 
4770         page = (char *) get_zeroed_page(GFP_ATOMIC);
4771         if (page == NULL) {
4772                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4773                             "No memory to dump sense data");
4774                 return;
4775         }
4776         /* dump the sense data */
4777         len = sprintf(page, PRINTK_HEADER
4778                       " I/O status report for device %s:\n",
4779                       dev_name(&device->cdev->dev));
4780         len += sprintf(page + len, PRINTK_HEADER
4781                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4782                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4783                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4784                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4785                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4786                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4787                        req ? req->intrc : 0);
4788         len += sprintf(page + len, PRINTK_HEADER
4789                        " device %s: Failing TCW: %p\n",
4790                        dev_name(&device->cdev->dev),
4791                        (void *) (addr_t) irb->scsw.tm.tcw);
4792 
4793         tsb = NULL;
4794         sense = NULL;
4795         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4796                 tsb = tcw_get_tsb(
4797                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4798 
4799         if (tsb) {
4800                 len += sprintf(page + len, PRINTK_HEADER
4801                                " tsb->length %d\n", tsb->length);
4802                 len += sprintf(page + len, PRINTK_HEADER
4803                                " tsb->flags %x\n", tsb->flags);
4804                 len += sprintf(page + len, PRINTK_HEADER
4805                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4806                 len += sprintf(page + len, PRINTK_HEADER
4807                                " tsb->count %d\n", tsb->count);
4808                 residual = tsb->count - 28;
4809                 len += sprintf(page + len, PRINTK_HEADER
4810                                " residual %d\n", residual);
4811 
4812                 switch (tsb->flags & 0x07) {
4813                 case 1: /* tsa_iostat */
4814                         len += sprintf(page + len, PRINTK_HEADER
4815                                " tsb->tsa.iostat.dev_time %d\n",
4816                                        tsb->tsa.iostat.dev_time);
4817                         len += sprintf(page + len, PRINTK_HEADER
4818                                " tsb->tsa.iostat.def_time %d\n",
4819                                        tsb->tsa.iostat.def_time);
4820                         len += sprintf(page + len, PRINTK_HEADER
4821                                " tsb->tsa.iostat.queue_time %d\n",
4822                                        tsb->tsa.iostat.queue_time);
4823                         len += sprintf(page + len, PRINTK_HEADER
4824                                " tsb->tsa.iostat.dev_busy_time %d\n",
4825                                        tsb->tsa.iostat.dev_busy_time);
4826                         len += sprintf(page + len, PRINTK_HEADER
4827                                " tsb->tsa.iostat.dev_act_time %d\n",
4828                                        tsb->tsa.iostat.dev_act_time);
4829                         sense = tsb->tsa.iostat.sense;
4830                         break;
4831                 case 2: /* ts_ddpc */
4832                         len += sprintf(page + len, PRINTK_HEADER
4833                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4834                         for (sl = 0; sl < 2; sl++) {
4835                                 len += sprintf(page + len, PRINTK_HEADER
4836                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4837                                                (8 * sl), ((8 * sl) + 7));
4838                                 rcq = tsb->tsa.ddpc.rcq;
4839                                 for (sct = 0; sct < 8; sct++) {
4840                                         len += sprintf(page + len, " %02x",
4841                                                        rcq[8 * sl + sct]);
4842                                 }
4843                                 len += sprintf(page + len, "\n");
4844                         }
4845                         sense = tsb->tsa.ddpc.sense;
4846                         break;
4847                 case 3: /* tsa_intrg */
4848                         len += sprintf(page + len, PRINTK_HEADER
4849                                       " tsb->tsa.intrg.: not supportet yet\n");
4850                         break;
4851                 }
4852 
4853                 if (sense) {
4854                         for (sl = 0; sl < 4; sl++) {
4855                                 len += sprintf(page + len, PRINTK_HEADER
4856                                                " Sense(hex) %2d-%2d:",
4857                                                (8 * sl), ((8 * sl) + 7));
4858                                 for (sct = 0; sct < 8; sct++) {
4859                                         len += sprintf(page + len, " %02x",
4860                                                        sense[8 * sl + sct]);
4861                                 }
4862                                 len += sprintf(page + len, "\n");
4863                         }
4864 
4865                         if (sense[27] & DASD_SENSE_BIT_0) {
4866                                 /* 24 Byte Sense Data */
4867                                 sprintf(page + len, PRINTK_HEADER
4868                                         " 24 Byte: %x MSG %x, "
4869                                         "%s MSGb to SYSOP\n",
4870                                         sense[7] >> 4, sense[7] & 0x0f,
4871                                         sense[1] & 0x10 ? "" : "no");
4872                         } else {
4873                                 /* 32 Byte Sense Data */
4874                                 sprintf(page + len, PRINTK_HEADER
4875                                         " 32 Byte: Format: %x "
4876                                         "Exception class %x\n",
4877                                         sense[6] & 0x0f, sense[22] >> 4);
4878                         }
4879                 } else {
4880                         sprintf(page + len, PRINTK_HEADER
4881                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4882                 }
4883         } else {
4884                 sprintf(page + len, PRINTK_HEADER
4885                         " SORRY - NO TSB DATA AVAILABLE\n");
4886         }
4887         printk(KERN_ERR "%s", page);
4888         free_page((unsigned long) page);
4889 }
4890 
4891 static void dasd_eckd_dump_sense(struct dasd_device *device,
4892                                  struct dasd_ccw_req *req, struct irb *irb)
4893 {
4894         u8 *sense = dasd_get_sense(irb);
4895 
4896         if (scsw_is_tm(&irb->scsw)) {
4897                 /*
4898                  * In some cases the 'File Protected' or 'Incorrect Length'
4899                  * error might be expected and log messages shouldn't be written
4900                  * then. Check if the according suppress bit is set.
4901                  */
4902                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4903                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4904                         return;
4905                 if (scsw_cstat(&irb->scsw) == 0x40 &&
4906                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4907                         return;
4908 
4909                 dasd_eckd_dump_sense_tcw(device, req, irb);
4910         } else {
4911                 /*
4912                  * In some cases the 'No Record Found' error might be expected
4913                  * and log messages shouldn't be written then. Check if the
4914                  * according suppress bit is set.
4915                  */
4916                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4917                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4918                         return;
4919 
4920                 dasd_eckd_dump_sense_ccw(device, req, irb);
4921         }
4922 }
4923 
4924 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4925 {
4926         /*
4927          * the device should be disconnected from our LCU structure
4928          * on restore we will reconnect it and reread LCU specific
4929          * information like PAV support that might have changed
4930          */
4931         dasd_alias_remove_device(device);
4932         dasd_alias_disconnect_device_from_lcu(device);
4933 
4934         return 0;
4935 }
4936 
4937 static int dasd_eckd_restore_device(struct dasd_device *device)
4938 {
4939         struct dasd_eckd_private *private = device->private;
4940         struct dasd_eckd_characteristics temp_rdc_data;
4941         int rc;
4942         struct dasd_uid temp_uid;
4943         unsigned long flags;
4944         unsigned long cqr_flags = 0;
4945 
4946         /* Read Configuration Data */
4947         rc = dasd_eckd_read_conf(device);
4948         if (rc) {
4949                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4950                                 "Read configuration data failed, rc=%d", rc);
4951                 goto out_err;
4952         }
4953 
4954         dasd_eckd_get_uid(device, &temp_uid);
4955         /* Generate device unique id */
4956         rc = dasd_eckd_generate_uid(device);
4957         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4958         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4959                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4960                         "changed\n");
4961         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4962         if (rc)
4963                 goto out_err;
4964 
4965         /* register lcu with alias handling, enable PAV if this is a new lcu */
4966         rc = dasd_alias_make_device_known_to_lcu(device);
4967         if (rc)
4968                 goto out_err;
4969 
4970         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4971         dasd_eckd_validate_server(device, cqr_flags);
4972 
4973         /* RE-Read Configuration Data */
4974         rc = dasd_eckd_read_conf(device);
4975         if (rc) {
4976                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4977                         "Read configuration data failed, rc=%d", rc);
4978                 goto out_err2;
4979         }
4980 
4981         /* Read Feature Codes */
4982         dasd_eckd_read_features(device);
4983 
4984         /* Read Device Characteristics */
4985         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4986                                          &temp_rdc_data, 64);
4987         if (rc) {
4988                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4989                                 "Read device characteristic failed, rc=%d", rc);
4990                 goto out_err2;
4991         }
4992         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4993         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4994         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4995 
4996         /* add device to alias management */
4997         dasd_alias_add_device(device);
4998 
4999         return 0;
5000 
5001 out_err2:
5002         dasd_alias_disconnect_device_from_lcu(device);
5003 out_err:
5004         return -1;
5005 }
5006 
5007 static int dasd_eckd_reload_device(struct dasd_device *device)
5008 {
5009         struct dasd_eckd_private *private = device->private;
5010         int rc, old_base;
5011         char print_uid[60];
5012         struct dasd_uid uid;
5013         unsigned long flags;
5014 
5015         /*
5016          * remove device from alias handling to prevent new requests
5017          * from being scheduled on the wrong alias device
5018          */
5019         dasd_alias_remove_device(device);
5020 
5021         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5022         old_base = private->uid.base_unit_addr;
5023         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5024 
5025         /* Read Configuration Data */
5026         rc = dasd_eckd_read_conf(device);
5027         if (rc)
5028                 goto out_err;
5029 
5030         rc = dasd_eckd_generate_uid(device);
5031         if (rc)
5032                 goto out_err;
5033         /*
5034          * update unit address configuration and
5035          * add device to alias management
5036          */
5037         dasd_alias_update_add_device(device);
5038 
5039         dasd_eckd_get_uid(device, &uid);
5040 
5041         if (old_base != uid.base_unit_addr) {
5042                 if (strlen(uid.vduit) > 0)
5043                         snprintf(print_uid, sizeof(print_uid),
5044                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5045                                  uid.ssid, uid.base_unit_addr, uid.vduit);
5046                 else
5047                         snprintf(print_uid, sizeof(print_uid),
5048                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5049                                  uid.ssid, uid.base_unit_addr);
5050 
5051                 dev_info(&device->cdev->dev,
5052                          "An Alias device was reassigned to a new base device "
5053                          "with UID: %s\n", print_uid);
5054         }
5055         return 0;
5056 
5057 out_err:
5058         return -1;
5059 }
5060 
5061 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5062                                          struct dasd_rssd_messages *messages,
5063                                          __u8 lpum)
5064 {
5065         struct dasd_rssd_messages *message_buf;
5066         struct dasd_psf_prssd_data *prssdp;
5067         struct dasd_ccw_req *cqr;
5068         struct ccw1 *ccw;
5069         int rc;
5070 
5071         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5072                                    (sizeof(struct dasd_psf_prssd_data) +
5073                                     sizeof(struct dasd_rssd_messages)),
5074                                    device);
5075         if (IS_ERR(cqr)) {
5076                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5077                                 "Could not allocate read message buffer request");
5078                 return PTR_ERR(cqr);
5079         }
5080 
5081         cqr->lpm = lpum;
5082 retry:
5083         cqr->startdev = device;
5084         cqr->memdev = device;
5085         cqr->block = NULL;
5086         cqr->expires = 10 * HZ;
5087         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5088         /* dasd_sleep_on_immediatly does not do complex error
5089          * recovery so clear erp flag and set retry counter to
5090          * do basic erp */
5091         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5092         cqr->retries = 256;
5093 
5094         /* Prepare for Read Subsystem Data */
5095         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5096         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5097         prssdp->order = PSF_ORDER_PRSSD;
5098         prssdp->suborder = 0x03;        /* Message Buffer */
5099         /* all other bytes of prssdp must be zero */
5100 
5101         ccw = cqr->cpaddr;
5102         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5103         ccw->count = sizeof(struct dasd_psf_prssd_data);
5104         ccw->flags |= CCW_FLAG_CC;
5105         ccw->flags |= CCW_FLAG_SLI;
5106         ccw->cda = (__u32)(addr_t) prssdp;
5107 
5108         /* Read Subsystem Data - message buffer */
5109         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5110         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5111 
5112         ccw++;
5113         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5114         ccw->count = sizeof(struct dasd_rssd_messages);
5115         ccw->flags |= CCW_FLAG_SLI;
5116         ccw->cda = (__u32)(addr_t) message_buf;
5117 
5118         cqr->buildclk = get_tod_clock();
5119         cqr->status = DASD_CQR_FILLED;
5120         rc = dasd_sleep_on_immediatly(cqr);
5121         if (rc == 0) {
5122                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5123                 message_buf = (struct dasd_rssd_messages *)
5124                         (prssdp + 1);
5125                 memcpy(messages, message_buf,
5126                        sizeof(struct dasd_rssd_messages));
5127         } else if (cqr->lpm) {
5128                 /*
5129                  * on z/VM we might not be able to do I/O on the requested path
5130                  * but instead we get the required information on any path
5131                  * so retry with open path mask
5132                  */
5133                 cqr->lpm = 0;
5134                 goto retry;
5135         } else
5136                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5137                                 "Reading messages failed with rc=%d\n"
5138                                 , rc);
5139         dasd_sfree_request(cqr, cqr->memdev);
5140         return rc;
5141 }
5142 
5143 static int dasd_eckd_query_host_access(struct dasd_device *device,
5144                                        struct dasd_psf_query_host_access *data)
5145 {
5146         struct dasd_eckd_private *private = device->private;
5147         struct dasd_psf_query_host_access *host_access;
5148         struct dasd_psf_prssd_data *prssdp;
5149         struct dasd_ccw_req *cqr;
5150         struct ccw1 *ccw;
5151         int rc;
5152 
5153         /* not available for HYPER PAV alias devices */
5154         if (!device->block && private->lcu->pav == HYPER_PAV)
5155                 return -EOPNOTSUPP;
5156 
5157         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5158                                    sizeof(struct dasd_psf_prssd_data) + 1,
5159                                    device);
5160         if (IS_ERR(cqr)) {
5161                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5162                                 "Could not allocate read message buffer request");
5163                 return PTR_ERR(cqr);
5164         }
5165         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5166         if (!host_access) {
5167                 dasd_sfree_request(cqr, device);
5168                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5169                                 "Could not allocate host_access buffer");
5170                 return -ENOMEM;
5171         }
5172         cqr->startdev = device;
5173         cqr->memdev = device;
5174         cqr->block = NULL;
5175         cqr->retries = 256;
5176         cqr->expires = 10 * HZ;
5177 
5178         /* Prepare for Read Subsystem Data */
5179         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5180         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5181         prssdp->order = PSF_ORDER_PRSSD;
5182         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5183         /* LSS and Volume that will be queried */
5184         prssdp->lss = private->ned->ID;
5185         prssdp->volume = private->ned->unit_addr;
5186         /* all other bytes of prssdp must be zero */
5187 
5188         ccw = cqr->cpaddr;
5189         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5190         ccw->count = sizeof(struct dasd_psf_prssd_data);
5191         ccw->flags |= CCW_FLAG_CC;
5192         ccw->flags |= CCW_FLAG_SLI;
5193         ccw->cda = (__u32)(addr_t) prssdp;
5194 
5195         /* Read Subsystem Data - query host access */
5196         ccw++;
5197         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5198         ccw->count = sizeof(struct dasd_psf_query_host_access);
5199         ccw->flags |= CCW_FLAG_SLI;
5200         ccw->cda = (__u32)(addr_t) host_access;
5201 
5202         cqr->buildclk = get_tod_clock();
5203         cqr->status = DASD_CQR_FILLED;
5204         rc = dasd_sleep_on(cqr);
5205         if (rc == 0) {
5206                 *data = *host_access;
5207         } else {
5208                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5209                                 "Reading host access data failed with rc=%d\n",
5210                                 rc);
5211                 rc = -EOPNOTSUPP;
5212         }
5213 
5214         dasd_sfree_request(cqr, cqr->memdev);
5215         kfree(host_access);
5216         return rc;
5217 }
5218 /*
5219  * return number of grouped devices
5220  */
5221 static int dasd_eckd_host_access_count(struct dasd_device *device)
5222 {
5223         struct dasd_psf_query_host_access *access;
5224         struct dasd_ckd_path_group_entry *entry;
5225         struct dasd_ckd_host_information *info;
5226         int count = 0;
5227         int rc, i;
5228 
5229         access = kzalloc(sizeof(*access), GFP_NOIO);
5230         if (!access) {
5231                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5232                                 "Could not allocate access buffer");
5233                 return -ENOMEM;
5234         }
5235         rc = dasd_eckd_query_host_access(device, access);
5236         if (rc) {
5237                 kfree(access);
5238                 return rc;
5239         }
5240 
5241         info = (struct dasd_ckd_host_information *)
5242                 access->host_access_information;
5243         for (i = 0; i < info->entry_count; i++) {
5244                 entry = (struct dasd_ckd_path_group_entry *)
5245                         (info->entry + i * info->entry_size);
5246                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5247                         count++;
5248         }
5249 
5250         kfree(access);
5251         return count;
5252 }
5253 
5254 /*
5255  * write host access information to a sequential file
5256  */
5257 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5258 {
5259         struct dasd_psf_query_host_access *access;
5260         struct dasd_ckd_path_group_entry *entry;
5261         struct dasd_ckd_host_information *info;
5262         char sysplex[9] = "";
5263         int rc, i, j;
5264 
5265         access = kzalloc(sizeof(*access), GFP_NOIO);
5266         if (!access) {
5267                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5268                                 "Could not allocate access buffer");
5269                 return -ENOMEM;
5270         }
5271         rc = dasd_eckd_query_host_access(device, access);
5272         if (rc) {
5273                 kfree(access);
5274                 return rc;
5275         }
5276 
5277         info = (struct dasd_ckd_host_information *)
5278                 access->host_access_information;
5279         for (i = 0; i < info->entry_count; i++) {
5280                 entry = (struct dasd_ckd_path_group_entry *)
5281                         (info->entry + i * info->entry_size);
5282                 /* PGID */
5283                 seq_puts(m, "pgid ");
5284                 for (j = 0; j < 11; j++)
5285                         seq_printf(m, "%02x", entry->pgid[j]);
5286                 seq_putc(m, '\n');
5287                 /* FLAGS */
5288                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5289                 /* SYSPLEX NAME */
5290                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5291                 EBCASC(sysplex, sizeof(sysplex));
5292                 seq_printf(m, "sysplex_name %8s\n", sysplex);
5293                 /* SUPPORTED CYLINDER */
5294                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5295                 /* TIMESTAMP */
5296                 seq_printf(m, "timestamp %lu\n", (unsigned long)
5297                            entry->timestamp);
5298         }
5299         kfree(access);
5300 
5301         return 0;
5302 }
5303 
5304 /*
5305  * Perform Subsystem Function - CUIR response
5306  */
5307 static int
5308 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5309                             __u32 message_id,
5310                             struct channel_path_desc *desc,
5311                             struct subchannel_id sch_id)
5312 {
5313         struct dasd_psf_cuir_response *psf_cuir;
5314         struct dasd_ccw_req *cqr;
5315         struct ccw1 *ccw;
5316         int rc;
5317 
5318         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5319                                   sizeof(struct dasd_psf_cuir_response),
5320                                   device);
5321 
5322         if (IS_ERR(cqr)) {
5323                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5324                            "Could not allocate PSF-CUIR request");
5325                 return PTR_ERR(cqr);
5326         }
5327 
5328         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5329         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5330         psf_cuir->cc = response;
5331         if (desc)
5332                 psf_cuir->chpid = desc->chpid;
5333         psf_cuir->message_id = message_id;
5334         psf_cuir->cssid = sch_id.cssid;
5335         psf_cuir->ssid = sch_id.ssid;
5336         ccw = cqr->cpaddr;
5337         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5338         ccw->cda = (__u32)(addr_t)psf_cuir;
5339         ccw->flags = CCW_FLAG_SLI;
5340         ccw->count = sizeof(struct dasd_psf_cuir_response);
5341 
5342         cqr->startdev = device;
5343         cqr->memdev = device;
5344         cqr->block = NULL;
5345         cqr->retries = 256;
5346         cqr->expires = 10*HZ;
5347         cqr->buildclk = get_tod_clock();
5348         cqr->status = DASD_CQR_FILLED;
5349         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5350 
5351         rc = dasd_sleep_on(cqr);
5352 
5353         dasd_sfree_request(cqr, cqr->memdev);
5354         return rc;
5355 }
5356 
5357 /*
5358  * return configuration data that is referenced by record selector
5359  * if a record selector is specified or per default return the
5360  * conf_data pointer for the path specified by lpum
5361  */
5362 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5363                                                      __u8 lpum,
5364                                                      struct dasd_cuir_message *cuir)
5365 {
5366         struct dasd_eckd_private *private = device->private;
5367         struct dasd_conf_data *conf_data;
5368         int path, pos;
5369 
5370         if (cuir->record_selector == 0)
5371                 goto out;
5372         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5373                 conf_data = private->path_conf_data[pos];
5374                 if (conf_data->gneq.record_selector ==
5375                     cuir->record_selector)
5376                         return conf_data;
5377         }
5378 out:
5379         return private->path_conf_data[pathmask_to_pos(lpum)];
5380 }
5381 
5382 /*
5383  * This function determines the scope of a reconfiguration request by
5384  * analysing the path and device selection data provided in the CUIR request.
5385  * Returns a path mask containing CUIR affected paths for the give device.
5386  *
5387  * If the CUIR request does not contain the required information return the
5388  * path mask of the path the attention message for the CUIR request was reveived
5389  * on.
5390  */
5391 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5392                                 struct dasd_cuir_message *cuir)
5393 {
5394         struct dasd_eckd_private *private = device->private;
5395         struct dasd_conf_data *ref_conf_data;
5396         unsigned long bitmask = 0, mask = 0;
5397         struct dasd_conf_data *conf_data;
5398         unsigned int pos, path;
5399         char *ref_gneq, *gneq;
5400         char *ref_ned, *ned;
5401         int tbcpm = 0;
5402 
5403         /* if CUIR request does not specify the scope use the path
5404            the attention message was presented on */
5405         if (!cuir->ned_map ||
5406             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5407                 return lpum;
5408 
5409         /* get reference conf data */
5410         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5411         /* reference ned is determined by ned_map field */
5412         pos = 8 - ffs(cuir->ned_map);
5413         ref_ned = (char *)&ref_conf_data->neds[pos];
5414         ref_gneq = (char *)&ref_conf_data->gneq;
5415         /* transfer 24 bit neq_map to mask */
5416         mask = cuir->neq_map[2];
5417         mask |= cuir->neq_map[1] << 8;
5418         mask |= cuir->neq_map[0] << 16;
5419 
5420         for (path = 0x80; path; path >>= 1) {
5421                 /* initialise data per path */
5422                 bitmask = mask;
5423                 pos = pathmask_to_pos(path);
5424                 conf_data = private->path_conf_data[pos];
5425                 pos = 8 - ffs(cuir->ned_map);
5426                 ned = (char *) &conf_data->neds[pos];
5427                 /* compare reference ned and per path ned */
5428                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5429                         continue;
5430                 gneq = (char *)&conf_data->gneq;
5431                 /* compare reference gneq and per_path gneq under
5432                    24 bit mask where mask bit 0 equals byte 7 of
5433                    the gneq and mask bit 24 equals byte 31 */
5434                 while (bitmask) {
5435                         pos = ffs(bitmask) - 1;
5436                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5437                             != 0)
5438                                 break;
5439                         clear_bit(pos, &bitmask);
5440                 }
5441                 if (bitmask)
5442                         continue;
5443                 /* device and path match the reference values
5444                    add path to CUIR scope */
5445                 tbcpm |= path;
5446         }
5447         return tbcpm;
5448 }
5449 
5450 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5451                                        unsigned long paths,
5452                                        struct subchannel_id sch_id, int action)
5453 {
5454         struct channel_path_desc *desc;
5455         int pos;
5456 
5457         while (paths) {
5458                 /* get position of bit in mask */
5459                 pos = ffs(paths) - 1;
5460                 /* get channel path descriptor from this position */
5461                 desc = ccw_device_get_chp_desc(device->cdev, 7 - pos);
5462                 if (action == CUIR_QUIESCE)
5463                         pr_warn("Service on the storage server caused path "
5464                                 "%x.%02x to go offline", sch_id.cssid,
5465                                 desc ? desc->chpid : 0);
5466                 else if (action == CUIR_RESUME)
5467                         pr_info("Path %x.%02x is back online after service "
5468                                 "on the storage server", sch_id.cssid,
5469                                 desc ? desc->chpid : 0);
5470                 kfree(desc);
5471                 clear_bit(pos, &paths);
5472         }
5473 }
5474 
5475 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5476                                       struct dasd_cuir_message *cuir)
5477 {
5478         unsigned long tbcpm;
5479 
5480         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5481         /* nothing to do if path is not in use */
5482         if (!(device->path_data.opm & tbcpm))
5483                 return 0;
5484         if (!(device->path_data.opm & ~tbcpm)) {
5485                 /* no path would be left if the CUIR action is taken
5486                    return error */
5487                 return -EINVAL;
5488         }
5489         /* remove device from operational path mask */
5490         device->path_data.opm &= ~tbcpm;
5491         device->path_data.cuirpm |= tbcpm;
5492         return tbcpm;
5493 }
5494 
5495 /*
5496  * walk through all devices and build a path mask to quiesce them
5497  * return an error if the last path to a device would be removed
5498  *
5499  * if only part of the devices are quiesced and an error
5500  * occurs no onlining necessary, the storage server will
5501  * notify the already set offline devices again
5502  */
5503 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5504                                   struct subchannel_id sch_id,
5505                                   struct dasd_cuir_message *cuir)
5506 {
5507         struct dasd_eckd_private *private = device->private;
5508         struct alias_pav_group *pavgroup, *tempgroup;
5509         struct dasd_device *dev, *n;
5510         unsigned long paths = 0;
5511         unsigned long flags;
5512         int tbcpm;
5513 
5514         /* active devices */
5515         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5516                                  alias_list) {
5517                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5518                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5519                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5520                 if (tbcpm < 0)
5521                         goto out_err;
5522                 paths |= tbcpm;
5523         }
5524         /* inactive devices */
5525         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5526                                  alias_list) {
5527                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5528                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5529                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5530                 if (tbcpm < 0)
5531                         goto out_err;
5532                 paths |= tbcpm;
5533         }
5534         /* devices in PAV groups */
5535         list_for_each_entry_safe(pavgroup, tempgroup,
5536                                  &private->lcu->grouplist, group) {
5537                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5538                                          alias_list) {
5539                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5540                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5541                         spin_unlock_irqrestore(
5542                                 get_ccwdev_lock(dev->cdev), flags);
5543                         if (tbcpm < 0)
5544                                 goto out_err;
5545                         paths |= tbcpm;
5546                 }
5547                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5548                                          alias_list) {
5549                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5550                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5551                         spin_unlock_irqrestore(
5552                                 get_ccwdev_lock(dev->cdev), flags);
5553                         if (tbcpm < 0)
5554                                 goto out_err;
5555                         paths |= tbcpm;
5556                 }
5557         }
5558         /* notify user about all paths affected by CUIR action */
5559         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_QUIESCE);
5560         return 0;
5561 out_err:
5562         return tbcpm;
5563 }
5564 
5565 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5566                                  struct subchannel_id sch_id,
5567                                  struct dasd_cuir_message *cuir)
5568 {
5569         struct dasd_eckd_private *private = device->private;
5570         struct alias_pav_group *pavgroup, *tempgroup;
5571         struct dasd_device *dev, *n;
5572         unsigned long paths = 0;
5573         int tbcpm;
5574 
5575         /*
5576          * the path may have been added through a generic path event before
5577          * only trigger path verification if the path is not already in use
5578          */
5579         list_for_each_entry_safe(dev, n,
5580                                  &private->lcu->active_devices,
5581                                  alias_list) {
5582                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5583                 paths |= tbcpm;
5584                 if (!(dev->path_data.opm & tbcpm)) {
5585                         dev->path_data.tbvpm |= tbcpm;
5586                         dasd_schedule_device_bh(dev);
5587                 }
5588         }
5589         list_for_each_entry_safe(dev, n,
5590                                  &private->lcu->inactive_devices,
5591                                  alias_list) {
5592                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5593                 paths |= tbcpm;
5594                 if (!(dev->path_data.opm & tbcpm)) {
5595                         dev->path_data.tbvpm |= tbcpm;
5596                         dasd_schedule_device_bh(dev);
5597                 }
5598         }
5599         /* devices in PAV groups */
5600         list_for_each_entry_safe(pavgroup, tempgroup,
5601                                  &private->lcu->grouplist,
5602                                  group) {
5603                 list_for_each_entry_safe(dev, n,
5604                                          &pavgroup->baselist,
5605                                          alias_list) {
5606                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5607                         paths |= tbcpm;
5608                         if (!(dev->path_data.opm & tbcpm)) {
5609                                 dev->path_data.tbvpm |= tbcpm;
5610                                 dasd_schedule_device_bh(dev);
5611                         }
5612                 }
5613                 list_for_each_entry_safe(dev, n,
5614                                          &pavgroup->aliaslist,
5615                                          alias_list) {
5616                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5617                         paths |= tbcpm;
5618                         if (!(dev->path_data.opm & tbcpm)) {
5619                                 dev->path_data.tbvpm |= tbcpm;
5620                                 dasd_schedule_device_bh(dev);
5621                         }
5622                 }
5623         }
5624         /* notify user about all paths affected by CUIR action */
5625         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_RESUME);
5626         return 0;
5627 }
5628 
5629 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5630                                  __u8 lpum)
5631 {
5632         struct dasd_cuir_message *cuir = messages;
5633         struct channel_path_desc *desc;
5634         struct subchannel_id sch_id;
5635         int pos, response;
5636 
5637         DBF_DEV_EVENT(DBF_WARNING, device,
5638                       "CUIR request: %016llx %016llx %016llx %08x",
5639                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5640                       ((u32 *)cuir)[3]);
5641         ccw_device_get_schid(device->cdev, &sch_id);
5642         pos = pathmask_to_pos(lpum);
5643         desc = ccw_device_get_chp_desc(device->cdev, pos);
5644 
5645         if (cuir->code == CUIR_QUIESCE) {
5646                 /* quiesce */
5647                 if (dasd_eckd_cuir_quiesce(device, lpum, sch_id, cuir))
5648                         response = PSF_CUIR_LAST_PATH;
5649                 else
5650                         response = PSF_CUIR_COMPLETED;
5651         } else if (cuir->code == CUIR_RESUME) {
5652                 /* resume */
5653                 dasd_eckd_cuir_resume(device, lpum, sch_id, cuir);
5654                 response = PSF_CUIR_COMPLETED;
5655         } else
5656                 response = PSF_CUIR_NOT_SUPPORTED;
5657 
5658         dasd_eckd_psf_cuir_response(device, response,
5659                                     cuir->message_id, desc, sch_id);
5660         DBF_DEV_EVENT(DBF_WARNING, device,
5661                       "CUIR response: %d on message ID %08x", response,
5662                       cuir->message_id);
5663         /* free descriptor copy */
5664         kfree(desc);
5665         /* to make sure there is no attention left schedule work again */
5666         device->discipline->check_attention(device, lpum);
5667 }
5668 
5669 static void dasd_eckd_check_attention_work(struct work_struct *work)
5670 {
5671         struct check_attention_work_data *data;
5672         struct dasd_rssd_messages *messages;
5673         struct dasd_device *device;
5674         int rc;
5675 
5676         data = container_of(work, struct check_attention_work_data, worker);
5677         device = data->device;
5678         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5679         if (!messages) {
5680                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5681                               "Could not allocate attention message buffer");
5682                 goto out;
5683         }
5684         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5685         if (rc)
5686                 goto out;
5687         if (messages->length == ATTENTION_LENGTH_CUIR &&
5688             messages->format == ATTENTION_FORMAT_CUIR)
5689                 dasd_eckd_handle_cuir(device, messages, data->lpum);
5690 out:
5691         dasd_put_device(device);
5692         kfree(messages);
5693         kfree(data);
5694 }
5695 
5696 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5697 {
5698         struct check_attention_work_data *data;
5699 
5700         data = kzalloc(sizeof(*data), GFP_ATOMIC);
5701         if (!data)
5702                 return -ENOMEM;
5703         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5704         dasd_get_device(device);
5705         data->device = device;
5706         data->lpum = lpum;
5707         schedule_work(&data->worker);
5708         return 0;
5709 }
5710 
5711 static struct ccw_driver dasd_eckd_driver = {
5712         .driver = {
5713                 .name   = "dasd-eckd",
5714                 .owner  = THIS_MODULE,
5715         },
5716         .ids         = dasd_eckd_ids,
5717         .probe       = dasd_eckd_probe,
5718         .remove      = dasd_generic_remove,
5719         .set_offline = dasd_generic_set_offline,
5720         .set_online  = dasd_eckd_set_online,
5721         .notify      = dasd_generic_notify,
5722         .path_event  = dasd_generic_path_event,
5723         .shutdown    = dasd_generic_shutdown,
5724         .freeze      = dasd_generic_pm_freeze,
5725         .thaw        = dasd_generic_restore_device,
5726         .restore     = dasd_generic_restore_device,
5727         .uc_handler  = dasd_generic_uc_handler,
5728         .int_class   = IRQIO_DAS,
5729 };
5730 
5731 /*
5732  * max_blocks is dependent on the amount of storage that is available
5733  * in the static io buffer for each device. Currently each device has
5734  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5735  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5736  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5737  * addition we have one define extent ccw + 16 bytes of data and one
5738  * locate record ccw + 16 bytes of data. That makes:
5739  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5740  * We want to fit two into the available memory so that we can immediately
5741  * start the next request if one finishes off. That makes 249.5 blocks
5742  * for one request. Give a little safety and the result is 240.
5743  */
5744 static struct dasd_discipline dasd_eckd_discipline = {
5745         .owner = THIS_MODULE,
5746         .name = "ECKD",
5747         .ebcname = "ECKD",
5748         .max_blocks = 190,
5749         .check_device = dasd_eckd_check_characteristics,
5750         .uncheck_device = dasd_eckd_uncheck_device,
5751         .do_analysis = dasd_eckd_do_analysis,
5752         .verify_path = dasd_eckd_verify_path,
5753         .basic_to_ready = dasd_eckd_basic_to_ready,
5754         .online_to_ready = dasd_eckd_online_to_ready,
5755         .basic_to_known = dasd_eckd_basic_to_known,
5756         .fill_geometry = dasd_eckd_fill_geometry,
5757         .start_IO = dasd_start_IO,
5758         .term_IO = dasd_term_IO,
5759         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5760         .format_device = dasd_eckd_format_device,
5761         .check_device_format = dasd_eckd_check_device_format,
5762         .erp_action = dasd_eckd_erp_action,
5763         .erp_postaction = dasd_eckd_erp_postaction,
5764         .check_for_device_change = dasd_eckd_check_for_device_change,
5765         .build_cp = dasd_eckd_build_alias_cp,
5766         .free_cp = dasd_eckd_free_alias_cp,
5767         .dump_sense = dasd_eckd_dump_sense,
5768         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5769         .fill_info = dasd_eckd_fill_info,
5770         .ioctl = dasd_eckd_ioctl,
5771         .freeze = dasd_eckd_pm_freeze,
5772         .restore = dasd_eckd_restore_device,
5773         .reload = dasd_eckd_reload_device,
5774         .get_uid = dasd_eckd_get_uid,
5775         .kick_validate = dasd_eckd_kick_validate_server,
5776         .check_attention = dasd_eckd_check_attention,
5777         .host_access_count = dasd_eckd_host_access_count,
5778         .hosts_print = dasd_hosts_print,
5779 };
5780 
5781 static int __init
5782 dasd_eckd_init(void)
5783 {
5784         int ret;
5785 
5786         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5787         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5788                                    GFP_KERNEL | GFP_DMA);
5789         if (!dasd_reserve_req)
5790                 return -ENOMEM;
5791         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5792                                    GFP_KERNEL | GFP_DMA);
5793         if (!path_verification_worker) {
5794                 kfree(dasd_reserve_req);
5795                 return -ENOMEM;
5796         }
5797         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5798         if (!rawpadpage) {
5799                 kfree(path_verification_worker);
5800                 kfree(dasd_reserve_req);
5801                 return -ENOMEM;
5802         }
5803         ret = ccw_driver_register(&dasd_eckd_driver);
5804         if (!ret)
5805                 wait_for_device_probe();
5806         else {
5807                 kfree(path_verification_worker);
5808                 kfree(dasd_reserve_req);
5809                 free_page((unsigned long)rawpadpage);
5810         }
5811         return ret;
5812 }
5813 
5814 static void __exit
5815 dasd_eckd_cleanup(void)
5816 {
5817         ccw_driver_unregister(&dasd_eckd_driver);
5818         kfree(path_verification_worker);
5819         kfree(dasd_reserve_req);
5820         free_page((unsigned long)rawpadpage);
5821 }
5822 
5823 module_init(dasd_eckd_init);
5824 module_exit(dasd_eckd_cleanup);
5825 

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