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

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