Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

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 int dasd_eckd_read_conf(struct dasd_device *device)
1036 {
1037         void *conf_data;
1038         int conf_len, conf_data_saved;
1039         int rc, path_err;
1040         __u8 lpm, opm;
1041         struct dasd_eckd_private *private, path_private;
1042         struct dasd_path *path_data;
1043         struct dasd_uid *uid;
1044         char print_path_uid[60], print_device_uid[60];
1045 
1046         private = (struct dasd_eckd_private *) device->private;
1047         path_data = &device->path_data;
1048         opm = ccw_device_get_path_mask(device->cdev);
1049         conf_data_saved = 0;
1050         path_err = 0;
1051         /* get configuration data per operational path */
1052         for (lpm = 0x80; lpm; lpm>>= 1) {
1053                 if (!(lpm & opm))
1054                         continue;
1055                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1056                                              &conf_len, lpm);
1057                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1058                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1059                                         "Read configuration data returned "
1060                                         "error %d", rc);
1061                         return rc;
1062                 }
1063                 if (conf_data == NULL) {
1064                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1065                                         "No configuration data "
1066                                         "retrieved");
1067                         /* no further analysis possible */
1068                         path_data->opm |= lpm;
1069                         continue;       /* no error */
1070                 }
1071                 /* save first valid configuration data */
1072                 if (!conf_data_saved) {
1073                         kfree(private->conf_data);
1074                         private->conf_data = conf_data;
1075                         private->conf_len = conf_len;
1076                         if (dasd_eckd_identify_conf_parts(private)) {
1077                                 private->conf_data = NULL;
1078                                 private->conf_len = 0;
1079                                 kfree(conf_data);
1080                                 continue;
1081                         }
1082                         /*
1083                          * build device UID that other path data
1084                          * can be compared to it
1085                          */
1086                         dasd_eckd_generate_uid(device);
1087                         conf_data_saved++;
1088                 } else {
1089                         path_private.conf_data = conf_data;
1090                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1091                         if (dasd_eckd_identify_conf_parts(
1092                                     &path_private)) {
1093                                 path_private.conf_data = NULL;
1094                                 path_private.conf_len = 0;
1095                                 kfree(conf_data);
1096                                 continue;
1097                         }
1098 
1099                         if (dasd_eckd_compare_path_uid(
1100                                     device, &path_private)) {
1101                                 uid = &path_private.uid;
1102                                 if (strlen(uid->vduit) > 0)
1103                                         snprintf(print_path_uid,
1104                                                  sizeof(print_path_uid),
1105                                                  "%s.%s.%04x.%02x.%s",
1106                                                  uid->vendor, uid->serial,
1107                                                  uid->ssid, uid->real_unit_addr,
1108                                                  uid->vduit);
1109                                 else
1110                                         snprintf(print_path_uid,
1111                                                  sizeof(print_path_uid),
1112                                                  "%s.%s.%04x.%02x",
1113                                                  uid->vendor, uid->serial,
1114                                                  uid->ssid,
1115                                                  uid->real_unit_addr);
1116                                 uid = &private->uid;
1117                                 if (strlen(uid->vduit) > 0)
1118                                         snprintf(print_device_uid,
1119                                                  sizeof(print_device_uid),
1120                                                  "%s.%s.%04x.%02x.%s",
1121                                                  uid->vendor, uid->serial,
1122                                                  uid->ssid, uid->real_unit_addr,
1123                                                  uid->vduit);
1124                                 else
1125                                         snprintf(print_device_uid,
1126                                                  sizeof(print_device_uid),
1127                                                  "%s.%s.%04x.%02x",
1128                                                  uid->vendor, uid->serial,
1129                                                  uid->ssid,
1130                                                  uid->real_unit_addr);
1131                                 dev_err(&device->cdev->dev,
1132                                         "Not all channel paths lead to "
1133                                         "the same device, path %02X leads to "
1134                                         "device %s instead of %s\n", lpm,
1135                                         print_path_uid, print_device_uid);
1136                                 path_err = -EINVAL;
1137                                 path_data->cablepm |= lpm;
1138                                 continue;
1139                         }
1140 
1141                         path_private.conf_data = NULL;
1142                         path_private.conf_len = 0;
1143                 }
1144                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1145                 case 0x02:
1146                         path_data->npm |= lpm;
1147                         break;
1148                 case 0x03:
1149                         path_data->ppm |= lpm;
1150                         break;
1151                 }
1152                 path_data->opm |= lpm;
1153                 /*
1154                  * if the path is used
1155                  * it should not be in one of the negative lists
1156                  */
1157                 path_data->cablepm &= ~lpm;
1158                 path_data->hpfpm &= ~lpm;
1159                 path_data->cuirpm &= ~lpm;
1160 
1161                 if (conf_data != private->conf_data)
1162                         kfree(conf_data);
1163         }
1164 
1165         return path_err;
1166 }
1167 
1168 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1169 {
1170         struct dasd_eckd_private *private;
1171         int mdc;
1172         u32 fcx_max_data;
1173 
1174         private = (struct dasd_eckd_private *) device->private;
1175         if (private->fcx_max_data) {
1176                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1177                 if ((mdc < 0)) {
1178                         dev_warn(&device->cdev->dev,
1179                                  "Detecting the maximum data size for zHPF "
1180                                  "requests failed (rc=%d) for a new path %x\n",
1181                                  mdc, lpm);
1182                         return mdc;
1183                 }
1184                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1185                 if (fcx_max_data < private->fcx_max_data) {
1186                         dev_warn(&device->cdev->dev,
1187                                  "The maximum data size for zHPF requests %u "
1188                                  "on a new path %x is below the active maximum "
1189                                  "%u\n", fcx_max_data, lpm,
1190                                  private->fcx_max_data);
1191                         return -EACCES;
1192                 }
1193         }
1194         return 0;
1195 }
1196 
1197 static int rebuild_device_uid(struct dasd_device *device,
1198                               struct path_verification_work_data *data)
1199 {
1200         struct dasd_eckd_private *private;
1201         struct dasd_path *path_data;
1202         __u8 lpm, opm;
1203         int rc;
1204 
1205         rc = -ENODEV;
1206         private = (struct dasd_eckd_private *) device->private;
1207         path_data = &device->path_data;
1208         opm = device->path_data.opm;
1209 
1210         for (lpm = 0x80; lpm; lpm >>= 1) {
1211                 if (!(lpm & opm))
1212                         continue;
1213                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1214                 memset(&data->cqr, 0, sizeof(data->cqr));
1215                 data->cqr.cpaddr = &data->ccw;
1216                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1217                                                      data->rcd_buffer,
1218                                                      lpm);
1219 
1220                 if (rc) {
1221                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1222                                 continue;
1223                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1224                                         "Read configuration data "
1225                                         "returned error %d", rc);
1226                         break;
1227                 }
1228                 memcpy(private->conf_data, data->rcd_buffer,
1229                        DASD_ECKD_RCD_DATA_SIZE);
1230                 if (dasd_eckd_identify_conf_parts(private)) {
1231                         rc = -ENODEV;
1232                 } else /* first valid path is enough */
1233                         break;
1234         }
1235 
1236         if (!rc)
1237                 rc = dasd_eckd_generate_uid(device);
1238 
1239         return rc;
1240 }
1241 
1242 static void do_path_verification_work(struct work_struct *work)
1243 {
1244         struct path_verification_work_data *data;
1245         struct dasd_device *device;
1246         struct dasd_eckd_private path_private;
1247         struct dasd_uid *uid;
1248         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1249         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1250         unsigned long flags;
1251         char print_uid[60];
1252         int rc;
1253 
1254         data = container_of(work, struct path_verification_work_data, worker);
1255         device = data->device;
1256 
1257         /* delay path verification until device was resumed */
1258         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1259                 schedule_work(work);
1260                 return;
1261         }
1262 
1263         opm = 0;
1264         npm = 0;
1265         ppm = 0;
1266         epm = 0;
1267         hpfpm = 0;
1268         cablepm = 0;
1269 
1270         for (lpm = 0x80; lpm; lpm >>= 1) {
1271                 if (!(lpm & data->tbvpm))
1272                         continue;
1273                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1274                 memset(&data->cqr, 0, sizeof(data->cqr));
1275                 data->cqr.cpaddr = &data->ccw;
1276                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1277                                                      data->rcd_buffer,
1278                                                      lpm);
1279                 if (!rc) {
1280                         switch (dasd_eckd_path_access(data->rcd_buffer,
1281                                                       DASD_ECKD_RCD_DATA_SIZE)
1282                                 ) {
1283                         case 0x02:
1284                                 npm |= lpm;
1285                                 break;
1286                         case 0x03:
1287                                 ppm |= lpm;
1288                                 break;
1289                         }
1290                         opm |= lpm;
1291                 } else if (rc == -EOPNOTSUPP) {
1292                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1293                                         "path verification: No configuration "
1294                                         "data retrieved");
1295                         opm |= lpm;
1296                 } else if (rc == -EAGAIN) {
1297                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1298                                         "path verification: device is stopped,"
1299                                         " try again later");
1300                         epm |= lpm;
1301                 } else {
1302                         dev_warn(&device->cdev->dev,
1303                                  "Reading device feature codes failed "
1304                                  "(rc=%d) for new path %x\n", rc, lpm);
1305                         continue;
1306                 }
1307                 if (verify_fcx_max_data(device, lpm)) {
1308                         opm &= ~lpm;
1309                         npm &= ~lpm;
1310                         ppm &= ~lpm;
1311                         hpfpm |= lpm;
1312                         continue;
1313                 }
1314 
1315                 /*
1316                  * save conf_data for comparison after
1317                  * rebuild_device_uid may have changed
1318                  * the original data
1319                  */
1320                 memcpy(&path_rcd_buf, data->rcd_buffer,
1321                        DASD_ECKD_RCD_DATA_SIZE);
1322                 path_private.conf_data = (void *) &path_rcd_buf;
1323                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1324                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1325                         path_private.conf_data = NULL;
1326                         path_private.conf_len = 0;
1327                         continue;
1328                 }
1329 
1330                 /*
1331                  * compare path UID with device UID only if at least
1332                  * one valid path is left
1333                  * in other case the device UID may have changed and
1334                  * the first working path UID will be used as device UID
1335                  */
1336                 if (device->path_data.opm &&
1337                     dasd_eckd_compare_path_uid(device, &path_private)) {
1338                         /*
1339                          * the comparison was not successful
1340                          * rebuild the device UID with at least one
1341                          * known path in case a z/VM hyperswap command
1342                          * has changed the device
1343                          *
1344                          * after this compare again
1345                          *
1346                          * if either the rebuild or the recompare fails
1347                          * the path can not be used
1348                          */
1349                         if (rebuild_device_uid(device, data) ||
1350                             dasd_eckd_compare_path_uid(
1351                                     device, &path_private)) {
1352                                 uid = &path_private.uid;
1353                                 if (strlen(uid->vduit) > 0)
1354                                         snprintf(print_uid, sizeof(print_uid),
1355                                                  "%s.%s.%04x.%02x.%s",
1356                                                  uid->vendor, uid->serial,
1357                                                  uid->ssid, uid->real_unit_addr,
1358                                                  uid->vduit);
1359                                 else
1360                                         snprintf(print_uid, sizeof(print_uid),
1361                                                  "%s.%s.%04x.%02x",
1362                                                  uid->vendor, uid->serial,
1363                                                  uid->ssid,
1364                                                  uid->real_unit_addr);
1365                                 dev_err(&device->cdev->dev,
1366                                         "The newly added channel path %02X "
1367                                         "will not be used because it leads "
1368                                         "to a different device %s\n",
1369                                         lpm, print_uid);
1370                                 opm &= ~lpm;
1371                                 npm &= ~lpm;
1372                                 ppm &= ~lpm;
1373                                 cablepm |= lpm;
1374                                 continue;
1375                         }
1376                 }
1377 
1378                 /*
1379                  * There is a small chance that a path is lost again between
1380                  * above path verification and the following modification of
1381                  * the device opm mask. We could avoid that race here by using
1382                  * yet another path mask, but we rather deal with this unlikely
1383                  * situation in dasd_start_IO.
1384                  */
1385                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1386                 if (!device->path_data.opm && opm) {
1387                         device->path_data.opm = opm;
1388                         device->path_data.cablepm &= ~opm;
1389                         device->path_data.cuirpm &= ~opm;
1390                         device->path_data.hpfpm &= ~opm;
1391                         dasd_generic_path_operational(device);
1392                 } else {
1393                         device->path_data.opm |= opm;
1394                         device->path_data.cablepm &= ~opm;
1395                         device->path_data.cuirpm &= ~opm;
1396                         device->path_data.hpfpm &= ~opm;
1397                 }
1398                 device->path_data.npm |= npm;
1399                 device->path_data.ppm |= ppm;
1400                 device->path_data.tbvpm |= epm;
1401                 device->path_data.cablepm |= cablepm;
1402                 device->path_data.hpfpm |= hpfpm;
1403                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1404         }
1405 
1406         dasd_put_device(device);
1407         if (data->isglobal)
1408                 mutex_unlock(&dasd_path_verification_mutex);
1409         else
1410                 kfree(data);
1411 }
1412 
1413 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1414 {
1415         struct path_verification_work_data *data;
1416 
1417         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1418         if (!data) {
1419                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1420                         data = path_verification_worker;
1421                         data->isglobal = 1;
1422                 } else
1423                         return -ENOMEM;
1424         } else {
1425                 memset(data, 0, sizeof(*data));
1426                 data->isglobal = 0;
1427         }
1428         INIT_WORK(&data->worker, do_path_verification_work);
1429         dasd_get_device(device);
1430         data->device = device;
1431         data->tbvpm = lpm;
1432         schedule_work(&data->worker);
1433         return 0;
1434 }
1435 
1436 static int dasd_eckd_read_features(struct dasd_device *device)
1437 {
1438         struct dasd_psf_prssd_data *prssdp;
1439         struct dasd_rssd_features *features;
1440         struct dasd_ccw_req *cqr;
1441         struct ccw1 *ccw;
1442         int rc;
1443         struct dasd_eckd_private *private;
1444 
1445         private = (struct dasd_eckd_private *) device->private;
1446         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1447         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1448                                    (sizeof(struct dasd_psf_prssd_data) +
1449                                     sizeof(struct dasd_rssd_features)),
1450                                    device);
1451         if (IS_ERR(cqr)) {
1452                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1453                                 "allocate initialization request");
1454                 return PTR_ERR(cqr);
1455         }
1456         cqr->startdev = device;
1457         cqr->memdev = device;
1458         cqr->block = NULL;
1459         cqr->retries = 256;
1460         cqr->expires = 10 * HZ;
1461 
1462         /* Prepare for Read Subsystem Data */
1463         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1464         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1465         prssdp->order = PSF_ORDER_PRSSD;
1466         prssdp->suborder = 0x41;        /* Read Feature Codes */
1467         /* all other bytes of prssdp must be zero */
1468 
1469         ccw = cqr->cpaddr;
1470         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1471         ccw->count = sizeof(struct dasd_psf_prssd_data);
1472         ccw->flags |= CCW_FLAG_CC;
1473         ccw->cda = (__u32)(addr_t) prssdp;
1474 
1475         /* Read Subsystem Data - feature codes */
1476         features = (struct dasd_rssd_features *) (prssdp + 1);
1477         memset(features, 0, sizeof(struct dasd_rssd_features));
1478 
1479         ccw++;
1480         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1481         ccw->count = sizeof(struct dasd_rssd_features);
1482         ccw->cda = (__u32)(addr_t) features;
1483 
1484         cqr->buildclk = get_tod_clock();
1485         cqr->status = DASD_CQR_FILLED;
1486         rc = dasd_sleep_on(cqr);
1487         if (rc == 0) {
1488                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1489                 features = (struct dasd_rssd_features *) (prssdp + 1);
1490                 memcpy(&private->features, features,
1491                        sizeof(struct dasd_rssd_features));
1492         } else
1493                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1494                          " failed with rc=%d\n", rc);
1495         dasd_sfree_request(cqr, cqr->memdev);
1496         return rc;
1497 }
1498 
1499 
1500 /*
1501  * Build CP for Perform Subsystem Function - SSC.
1502  */
1503 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1504                                                     int enable_pav)
1505 {
1506         struct dasd_ccw_req *cqr;
1507         struct dasd_psf_ssc_data *psf_ssc_data;
1508         struct ccw1 *ccw;
1509 
1510         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1511                                   sizeof(struct dasd_psf_ssc_data),
1512                                   device);
1513 
1514         if (IS_ERR(cqr)) {
1515                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1516                            "Could not allocate PSF-SSC request");
1517                 return cqr;
1518         }
1519         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1520         psf_ssc_data->order = PSF_ORDER_SSC;
1521         psf_ssc_data->suborder = 0xc0;
1522         if (enable_pav) {
1523                 psf_ssc_data->suborder |= 0x08;
1524                 psf_ssc_data->reserved[0] = 0x88;
1525         }
1526         ccw = cqr->cpaddr;
1527         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1528         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1529         ccw->count = 66;
1530 
1531         cqr->startdev = device;
1532         cqr->memdev = device;
1533         cqr->block = NULL;
1534         cqr->retries = 256;
1535         cqr->expires = 10*HZ;
1536         cqr->buildclk = get_tod_clock();
1537         cqr->status = DASD_CQR_FILLED;
1538         return cqr;
1539 }
1540 
1541 /*
1542  * Perform Subsystem Function.
1543  * It is necessary to trigger CIO for channel revalidation since this
1544  * call might change behaviour of DASD devices.
1545  */
1546 static int
1547 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1548                   unsigned long flags)
1549 {
1550         struct dasd_ccw_req *cqr;
1551         int rc;
1552 
1553         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1554         if (IS_ERR(cqr))
1555                 return PTR_ERR(cqr);
1556 
1557         /*
1558          * set flags e.g. turn on failfast, to prevent blocking
1559          * the calling function should handle failed requests
1560          */
1561         cqr->flags |= flags;
1562 
1563         rc = dasd_sleep_on(cqr);
1564         if (!rc)
1565                 /* trigger CIO to reprobe devices */
1566                 css_schedule_reprobe();
1567         else if (cqr->intrc == -EAGAIN)
1568                 rc = -EAGAIN;
1569 
1570         dasd_sfree_request(cqr, cqr->memdev);
1571         return rc;
1572 }
1573 
1574 /*
1575  * Valide storage server of current device.
1576  */
1577 static int dasd_eckd_validate_server(struct dasd_device *device,
1578                                      unsigned long flags)
1579 {
1580         int rc;
1581         struct dasd_eckd_private *private;
1582         int enable_pav;
1583 
1584         private = (struct dasd_eckd_private *) device->private;
1585         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1586             private->uid.type == UA_HYPER_PAV_ALIAS)
1587                 return 0;
1588         if (dasd_nopav || MACHINE_IS_VM)
1589                 enable_pav = 0;
1590         else
1591                 enable_pav = 1;
1592         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1593 
1594         /* may be requested feature is not available on server,
1595          * therefore just report error and go ahead */
1596         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1597                         "returned rc=%d", private->uid.ssid, rc);
1598         return rc;
1599 }
1600 
1601 /*
1602  * worker to do a validate server in case of a lost pathgroup
1603  */
1604 static void dasd_eckd_do_validate_server(struct work_struct *work)
1605 {
1606         struct dasd_device *device = container_of(work, struct dasd_device,
1607                                                   kick_validate);
1608         unsigned long flags = 0;
1609 
1610         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1611         if (dasd_eckd_validate_server(device, flags)
1612             == -EAGAIN) {
1613                 /* schedule worker again if failed */
1614                 schedule_work(&device->kick_validate);
1615                 return;
1616         }
1617 
1618         dasd_put_device(device);
1619 }
1620 
1621 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1622 {
1623         dasd_get_device(device);
1624         /* exit if device not online or in offline processing */
1625         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1626            device->state < DASD_STATE_ONLINE) {
1627                 dasd_put_device(device);
1628                 return;
1629         }
1630         /* queue call to do_validate_server to the kernel event daemon. */
1631         if (!schedule_work(&device->kick_validate))
1632                 dasd_put_device(device);
1633 }
1634 
1635 static u32 get_fcx_max_data(struct dasd_device *device)
1636 {
1637         int tpm, mdc;
1638         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1639         struct dasd_eckd_private *private;
1640 
1641         if (dasd_nofcx)
1642                 return 0;
1643         /* is transport mode supported? */
1644         private = (struct dasd_eckd_private *) device->private;
1645         fcx_in_css = css_general_characteristics.fcx;
1646         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1647         fcx_in_features = private->features.feature[40] & 0x80;
1648         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1649 
1650         if (!tpm)
1651                 return 0;
1652 
1653         mdc = ccw_device_get_mdc(device->cdev, 0);
1654         if (mdc < 0) {
1655                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1656                          " data size for zHPF requests failed\n");
1657                 return 0;
1658         } else
1659                 return mdc * FCX_MAX_DATA_FACTOR;
1660 }
1661 
1662 /*
1663  * Check device characteristics.
1664  * If the device is accessible using ECKD discipline, the device is enabled.
1665  */
1666 static int
1667 dasd_eckd_check_characteristics(struct dasd_device *device)
1668 {
1669         struct dasd_eckd_private *private;
1670         struct dasd_block *block;
1671         struct dasd_uid temp_uid;
1672         int rc, i;
1673         int readonly;
1674         unsigned long value;
1675 
1676         /* setup work queue for validate server*/
1677         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1678 
1679         if (!ccw_device_is_pathgroup(device->cdev)) {
1680                 dev_warn(&device->cdev->dev,
1681                          "A channel path group could not be established\n");
1682                 return -EIO;
1683         }
1684         if (!ccw_device_is_multipath(device->cdev)) {
1685                 dev_info(&device->cdev->dev,
1686                          "The DASD is not operating in multipath mode\n");
1687         }
1688         private = (struct dasd_eckd_private *) device->private;
1689         if (!private) {
1690                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1691                 if (!private) {
1692                         dev_warn(&device->cdev->dev,
1693                                  "Allocating memory for private DASD data "
1694                                  "failed\n");
1695                         return -ENOMEM;
1696                 }
1697                 device->private = (void *) private;
1698         } else {
1699                 memset(private, 0, sizeof(*private));
1700         }
1701         /* Invalidate status of initial analysis. */
1702         private->init_cqr_status = -1;
1703         /* Set default cache operations. */
1704         private->attrib.operation = DASD_NORMAL_CACHE;
1705         private->attrib.nr_cyl = 0;
1706 
1707         /* Read Configuration Data */
1708         rc = dasd_eckd_read_conf(device);
1709         if (rc)
1710                 goto out_err1;
1711 
1712         /* set default timeout */
1713         device->default_expires = DASD_EXPIRES;
1714         /* set default retry count */
1715         device->default_retries = DASD_RETRIES;
1716 
1717         if (private->gneq) {
1718                 value = 1;
1719                 for (i = 0; i < private->gneq->timeout.value; i++)
1720                         value = 10 * value;
1721                 value = value * private->gneq->timeout.number;
1722                 /* do not accept useless values */
1723                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1724                         device->default_expires = value;
1725         }
1726 
1727         dasd_eckd_get_uid(device, &temp_uid);
1728         if (temp_uid.type == UA_BASE_DEVICE) {
1729                 block = dasd_alloc_block();
1730                 if (IS_ERR(block)) {
1731                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1732                                         "could not allocate dasd "
1733                                         "block structure");
1734                         rc = PTR_ERR(block);
1735                         goto out_err1;
1736                 }
1737                 device->block = block;
1738                 block->base = device;
1739         }
1740 
1741         /* register lcu with alias handling, enable PAV */
1742         rc = dasd_alias_make_device_known_to_lcu(device);
1743         if (rc)
1744                 goto out_err2;
1745 
1746         dasd_eckd_validate_server(device, 0);
1747 
1748         /* device may report different configuration data after LCU setup */
1749         rc = dasd_eckd_read_conf(device);
1750         if (rc)
1751                 goto out_err3;
1752 
1753         /* Read Feature Codes */
1754         dasd_eckd_read_features(device);
1755 
1756         /* Read Device Characteristics */
1757         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1758                                          &private->rdc_data, 64);
1759         if (rc) {
1760                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1761                                 "Read device characteristic failed, rc=%d", rc);
1762                 goto out_err3;
1763         }
1764 
1765         if ((device->features & DASD_FEATURE_USERAW) &&
1766             !(private->rdc_data.facilities.RT_in_LR)) {
1767                 dev_err(&device->cdev->dev, "The storage server does not "
1768                         "support raw-track access\n");
1769                 rc = -EINVAL;
1770                 goto out_err3;
1771         }
1772 
1773         /* find the valid cylinder size */
1774         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1775             private->rdc_data.long_no_cyl)
1776                 private->real_cyl = private->rdc_data.long_no_cyl;
1777         else
1778                 private->real_cyl = private->rdc_data.no_cyl;
1779 
1780         private->fcx_max_data = get_fcx_max_data(device);
1781 
1782         readonly = dasd_device_is_ro(device);
1783         if (readonly)
1784                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1785 
1786         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1787                  "with %d cylinders, %d heads, %d sectors%s\n",
1788                  private->rdc_data.dev_type,
1789                  private->rdc_data.dev_model,
1790                  private->rdc_data.cu_type,
1791                  private->rdc_data.cu_model.model,
1792                  private->real_cyl,
1793                  private->rdc_data.trk_per_cyl,
1794                  private->rdc_data.sec_per_trk,
1795                  readonly ? ", read-only device" : "");
1796         return 0;
1797 
1798 out_err3:
1799         dasd_alias_disconnect_device_from_lcu(device);
1800 out_err2:
1801         dasd_free_block(device->block);
1802         device->block = NULL;
1803 out_err1:
1804         kfree(private->conf_data);
1805         kfree(device->private);
1806         device->private = NULL;
1807         return rc;
1808 }
1809 
1810 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1811 {
1812         struct dasd_eckd_private *private;
1813 
1814         private = (struct dasd_eckd_private *) device->private;
1815         dasd_alias_disconnect_device_from_lcu(device);
1816         private->ned = NULL;
1817         private->sneq = NULL;
1818         private->vdsneq = NULL;
1819         private->gneq = NULL;
1820         private->conf_len = 0;
1821         kfree(private->conf_data);
1822         private->conf_data = NULL;
1823 }
1824 
1825 static struct dasd_ccw_req *
1826 dasd_eckd_analysis_ccw(struct dasd_device *device)
1827 {
1828         struct dasd_eckd_private *private;
1829         struct eckd_count *count_data;
1830         struct LO_eckd_data *LO_data;
1831         struct dasd_ccw_req *cqr;
1832         struct ccw1 *ccw;
1833         int cplength, datasize;
1834         int i;
1835 
1836         private = (struct dasd_eckd_private *) device->private;
1837 
1838         cplength = 8;
1839         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1840         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1841         if (IS_ERR(cqr))
1842                 return cqr;
1843         ccw = cqr->cpaddr;
1844         /* Define extent for the first 3 tracks. */
1845         define_extent(ccw++, cqr->data, 0, 2,
1846                       DASD_ECKD_CCW_READ_COUNT, device);
1847         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1848         /* Locate record for the first 4 records on track 0. */
1849         ccw[-1].flags |= CCW_FLAG_CC;
1850         locate_record(ccw++, LO_data++, 0, 0, 4,
1851                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1852 
1853         count_data = private->count_area;
1854         for (i = 0; i < 4; i++) {
1855                 ccw[-1].flags |= CCW_FLAG_CC;
1856                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1857                 ccw->flags = 0;
1858                 ccw->count = 8;
1859                 ccw->cda = (__u32)(addr_t) count_data;
1860                 ccw++;
1861                 count_data++;
1862         }
1863 
1864         /* Locate record for the first record on track 2. */
1865         ccw[-1].flags |= CCW_FLAG_CC;
1866         locate_record(ccw++, LO_data++, 2, 0, 1,
1867                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1868         /* Read count ccw. */
1869         ccw[-1].flags |= CCW_FLAG_CC;
1870         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1871         ccw->flags = 0;
1872         ccw->count = 8;
1873         ccw->cda = (__u32)(addr_t) count_data;
1874 
1875         cqr->block = NULL;
1876         cqr->startdev = device;
1877         cqr->memdev = device;
1878         cqr->retries = 255;
1879         cqr->buildclk = get_tod_clock();
1880         cqr->status = DASD_CQR_FILLED;
1881         return cqr;
1882 }
1883 
1884 /* differentiate between 'no record found' and any other error */
1885 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1886 {
1887         char *sense;
1888         if (init_cqr->status == DASD_CQR_DONE)
1889                 return INIT_CQR_OK;
1890         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1891                  init_cqr->status == DASD_CQR_FAILED) {
1892                 sense = dasd_get_sense(&init_cqr->irb);
1893                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1894                         return INIT_CQR_UNFORMATTED;
1895                 else
1896                         return INIT_CQR_ERROR;
1897         } else
1898                 return INIT_CQR_ERROR;
1899 }
1900 
1901 /*
1902  * This is the callback function for the init_analysis cqr. It saves
1903  * the status of the initial analysis ccw before it frees it and kicks
1904  * the device to continue the startup sequence. This will call
1905  * dasd_eckd_do_analysis again (if the devices has not been marked
1906  * for deletion in the meantime).
1907  */
1908 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1909                                         void *data)
1910 {
1911         struct dasd_eckd_private *private;
1912         struct dasd_device *device;
1913 
1914         device = init_cqr->startdev;
1915         private = (struct dasd_eckd_private *) device->private;
1916         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1917         dasd_sfree_request(init_cqr, device);
1918         dasd_kick_device(device);
1919 }
1920 
1921 static int dasd_eckd_start_analysis(struct dasd_block *block)
1922 {
1923         struct dasd_ccw_req *init_cqr;
1924 
1925         init_cqr = dasd_eckd_analysis_ccw(block->base);
1926         if (IS_ERR(init_cqr))
1927                 return PTR_ERR(init_cqr);
1928         init_cqr->callback = dasd_eckd_analysis_callback;
1929         init_cqr->callback_data = NULL;
1930         init_cqr->expires = 5*HZ;
1931         /* first try without ERP, so we can later handle unformatted
1932          * devices as special case
1933          */
1934         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1935         init_cqr->retries = 0;
1936         dasd_add_request_head(init_cqr);
1937         return -EAGAIN;
1938 }
1939 
1940 static int dasd_eckd_end_analysis(struct dasd_block *block)
1941 {
1942         struct dasd_device *device;
1943         struct dasd_eckd_private *private;
1944         struct eckd_count *count_area;
1945         unsigned int sb, blk_per_trk;
1946         int status, i;
1947         struct dasd_ccw_req *init_cqr;
1948 
1949         device = block->base;
1950         private = (struct dasd_eckd_private *) device->private;
1951         status = private->init_cqr_status;
1952         private->init_cqr_status = -1;
1953         if (status == INIT_CQR_ERROR) {
1954                 /* try again, this time with full ERP */
1955                 init_cqr = dasd_eckd_analysis_ccw(device);
1956                 dasd_sleep_on(init_cqr);
1957                 status = dasd_eckd_analysis_evaluation(init_cqr);
1958                 dasd_sfree_request(init_cqr, device);
1959         }
1960 
1961         if (device->features & DASD_FEATURE_USERAW) {
1962                 block->bp_block = DASD_RAW_BLOCKSIZE;
1963                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1964                 block->s2b_shift = 3;
1965                 goto raw;
1966         }
1967 
1968         if (status == INIT_CQR_UNFORMATTED) {
1969                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1970                 return -EMEDIUMTYPE;
1971         } else if (status == INIT_CQR_ERROR) {
1972                 dev_err(&device->cdev->dev,
1973                         "Detecting the DASD disk layout failed because "
1974                         "of an I/O error\n");
1975                 return -EIO;
1976         }
1977 
1978         private->uses_cdl = 1;
1979         /* Check Track 0 for Compatible Disk Layout */
1980         count_area = NULL;
1981         for (i = 0; i < 3; i++) {
1982                 if (private->count_area[i].kl != 4 ||
1983                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1984                     private->count_area[i].cyl != 0 ||
1985                     private->count_area[i].head != count_area_head[i] ||
1986                     private->count_area[i].record != count_area_rec[i]) {
1987                         private->uses_cdl = 0;
1988                         break;
1989                 }
1990         }
1991         if (i == 3)
1992                 count_area = &private->count_area[4];
1993 
1994         if (private->uses_cdl == 0) {
1995                 for (i = 0; i < 5; i++) {
1996                         if ((private->count_area[i].kl != 0) ||
1997                             (private->count_area[i].dl !=
1998                              private->count_area[0].dl) ||
1999                             private->count_area[i].cyl !=  0 ||
2000                             private->count_area[i].head != count_area_head[i] ||
2001                             private->count_area[i].record != count_area_rec[i])
2002                                 break;
2003                 }
2004                 if (i == 5)
2005                         count_area = &private->count_area[0];
2006         } else {
2007                 if (private->count_area[3].record == 1)
2008                         dev_warn(&device->cdev->dev,
2009                                  "Track 0 has no records following the VTOC\n");
2010         }
2011 
2012         if (count_area != NULL && count_area->kl == 0) {
2013                 /* we found notthing violating our disk layout */
2014                 if (dasd_check_blocksize(count_area->dl) == 0)
2015                         block->bp_block = count_area->dl;
2016         }
2017         if (block->bp_block == 0) {
2018                 dev_warn(&device->cdev->dev,
2019                          "The disk layout of the DASD is not supported\n");
2020                 return -EMEDIUMTYPE;
2021         }
2022         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2023         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2024                 block->s2b_shift++;
2025 
2026         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2027 
2028 raw:
2029         block->blocks = (private->real_cyl *
2030                           private->rdc_data.trk_per_cyl *
2031                           blk_per_trk);
2032 
2033         dev_info(&device->cdev->dev,
2034                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2035                  "%s\n", (block->bp_block >> 10),
2036                  ((private->real_cyl *
2037                    private->rdc_data.trk_per_cyl *
2038                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2039                  ((blk_per_trk * block->bp_block) >> 10),
2040                  private->uses_cdl ?
2041                  "compatible disk layout" : "linux disk layout");
2042 
2043         return 0;
2044 }
2045 
2046 static int dasd_eckd_do_analysis(struct dasd_block *block)
2047 {
2048         struct dasd_eckd_private *private;
2049 
2050         private = (struct dasd_eckd_private *) block->base->private;
2051         if (private->init_cqr_status < 0)
2052                 return dasd_eckd_start_analysis(block);
2053         else
2054                 return dasd_eckd_end_analysis(block);
2055 }
2056 
2057 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2058 {
2059         return dasd_alias_add_device(device);
2060 };
2061 
2062 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2063 {
2064         cancel_work_sync(&device->reload_device);
2065         cancel_work_sync(&device->kick_validate);
2066         return 0;
2067 };
2068 
2069 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2070 {
2071         return dasd_alias_remove_device(device);
2072 };
2073 
2074 static int
2075 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2076 {
2077         struct dasd_eckd_private *private;
2078 
2079         private = (struct dasd_eckd_private *) block->base->private;
2080         if (dasd_check_blocksize(block->bp_block) == 0) {
2081                 geo->sectors = recs_per_track(&private->rdc_data,
2082                                               0, block->bp_block);
2083         }
2084         geo->cylinders = private->rdc_data.no_cyl;
2085         geo->heads = private->rdc_data.trk_per_cyl;
2086         return 0;
2087 }
2088 
2089 static struct dasd_ccw_req *
2090 dasd_eckd_build_format(struct dasd_device *base,
2091                        struct format_data_t *fdata,
2092                        int enable_pav)
2093 {
2094         struct dasd_eckd_private *base_priv;
2095         struct dasd_eckd_private *start_priv;
2096         struct dasd_device *startdev = NULL;
2097         struct dasd_ccw_req *fcp;
2098         struct eckd_count *ect;
2099         struct ch_t address;
2100         struct ccw1 *ccw;
2101         void *data;
2102         int rpt;
2103         int cplength, datasize;
2104         int i, j;
2105         int intensity = 0;
2106         int r0_perm;
2107         int nr_tracks;
2108         int use_prefix;
2109 
2110         if (enable_pav)
2111                 startdev = dasd_alias_get_start_dev(base);
2112 
2113         if (!startdev)
2114                 startdev = base;
2115 
2116         start_priv = (struct dasd_eckd_private *) startdev->private;
2117         base_priv = (struct dasd_eckd_private *) base->private;
2118 
2119         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2120 
2121         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2122 
2123         /*
2124          * fdata->intensity is a bit string that tells us what to do:
2125          *   Bit 0: write record zero
2126          *   Bit 1: write home address, currently not supported
2127          *   Bit 2: invalidate tracks
2128          *   Bit 3: use OS/390 compatible disk layout (cdl)
2129          *   Bit 4: do not allow storage subsystem to modify record zero
2130          * Only some bit combinations do make sense.
2131          */
2132         if (fdata->intensity & 0x10) {
2133                 r0_perm = 0;
2134                 intensity = fdata->intensity & ~0x10;
2135         } else {
2136                 r0_perm = 1;
2137                 intensity = fdata->intensity;
2138         }
2139 
2140         use_prefix = base_priv->features.feature[8] & 0x01;
2141 
2142         switch (intensity) {
2143         case 0x00:      /* Normal format */
2144         case 0x08:      /* Normal format, use cdl. */
2145                 cplength = 2 + (rpt*nr_tracks);
2146                 if (use_prefix)
2147                         datasize = sizeof(struct PFX_eckd_data) +
2148                                 sizeof(struct LO_eckd_data) +
2149                                 rpt * nr_tracks * sizeof(struct eckd_count);
2150                 else
2151                         datasize = sizeof(struct DE_eckd_data) +
2152                                 sizeof(struct LO_eckd_data) +
2153                                 rpt * nr_tracks * sizeof(struct eckd_count);
2154                 break;
2155         case 0x01:      /* Write record zero and format track. */
2156         case 0x09:      /* Write record zero and format track, use cdl. */
2157                 cplength = 2 + rpt * nr_tracks;
2158                 if (use_prefix)
2159                         datasize = sizeof(struct PFX_eckd_data) +
2160                                 sizeof(struct LO_eckd_data) +
2161                                 sizeof(struct eckd_count) +
2162                                 rpt * nr_tracks * sizeof(struct eckd_count);
2163                 else
2164                         datasize = sizeof(struct DE_eckd_data) +
2165                                 sizeof(struct LO_eckd_data) +
2166                                 sizeof(struct eckd_count) +
2167                                 rpt * nr_tracks * sizeof(struct eckd_count);
2168                 break;
2169         case 0x04:      /* Invalidate track. */
2170         case 0x0c:      /* Invalidate track, use cdl. */
2171                 cplength = 3;
2172                 if (use_prefix)
2173                         datasize = sizeof(struct PFX_eckd_data) +
2174                                 sizeof(struct LO_eckd_data) +
2175                                 sizeof(struct eckd_count);
2176                 else
2177                         datasize = sizeof(struct DE_eckd_data) +
2178                                 sizeof(struct LO_eckd_data) +
2179                                 sizeof(struct eckd_count);
2180                 break;
2181         default:
2182                 dev_warn(&startdev->cdev->dev,
2183                          "An I/O control call used incorrect flags 0x%x\n",
2184                          fdata->intensity);
2185                 return ERR_PTR(-EINVAL);
2186         }
2187         /* Allocate the format ccw request. */
2188         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2189                                    datasize, startdev);
2190         if (IS_ERR(fcp))
2191                 return fcp;
2192 
2193         start_priv->count++;
2194         data = fcp->data;
2195         ccw = fcp->cpaddr;
2196 
2197         switch (intensity & ~0x08) {
2198         case 0x00: /* Normal format. */
2199                 if (use_prefix) {
2200                         prefix(ccw++, (struct PFX_eckd_data *) data,
2201                                fdata->start_unit, fdata->stop_unit,
2202                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2203                         /* grant subsystem permission to format R0 */
2204                         if (r0_perm)
2205                                 ((struct PFX_eckd_data *)data)
2206                                         ->define_extent.ga_extended |= 0x04;
2207                         data += sizeof(struct PFX_eckd_data);
2208                 } else {
2209                         define_extent(ccw++, (struct DE_eckd_data *) data,
2210                                       fdata->start_unit, fdata->stop_unit,
2211                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2212                         /* grant subsystem permission to format R0 */
2213                         if (r0_perm)
2214                                 ((struct DE_eckd_data *) data)
2215                                         ->ga_extended |= 0x04;
2216                         data += sizeof(struct DE_eckd_data);
2217                 }
2218                 ccw[-1].flags |= CCW_FLAG_CC;
2219                 locate_record(ccw++, (struct LO_eckd_data *) data,
2220                               fdata->start_unit, 0, rpt*nr_tracks,
2221                               DASD_ECKD_CCW_WRITE_CKD, base,
2222                               fdata->blksize);
2223                 data += sizeof(struct LO_eckd_data);
2224                 break;
2225         case 0x01: /* Write record zero + format track. */
2226                 if (use_prefix) {
2227                         prefix(ccw++, (struct PFX_eckd_data *) data,
2228                                fdata->start_unit, fdata->stop_unit,
2229                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2230                                base, startdev);
2231                         data += sizeof(struct PFX_eckd_data);
2232                 } else {
2233                         define_extent(ccw++, (struct DE_eckd_data *) data,
2234                                fdata->start_unit, fdata->stop_unit,
2235                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2236                         data += sizeof(struct DE_eckd_data);
2237                 }
2238                 ccw[-1].flags |= CCW_FLAG_CC;
2239                 locate_record(ccw++, (struct LO_eckd_data *) data,
2240                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2241                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2242                               base->block->bp_block);
2243                 data += sizeof(struct LO_eckd_data);
2244                 break;
2245         case 0x04: /* Invalidate track. */
2246                 if (use_prefix) {
2247                         prefix(ccw++, (struct PFX_eckd_data *) data,
2248                                fdata->start_unit, fdata->stop_unit,
2249                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2250                         data += sizeof(struct PFX_eckd_data);
2251                 } else {
2252                         define_extent(ccw++, (struct DE_eckd_data *) data,
2253                                fdata->start_unit, fdata->stop_unit,
2254                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2255                         data += sizeof(struct DE_eckd_data);
2256                 }
2257                 ccw[-1].flags |= CCW_FLAG_CC;
2258                 locate_record(ccw++, (struct LO_eckd_data *) data,
2259                               fdata->start_unit, 0, 1,
2260                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2261                 data += sizeof(struct LO_eckd_data);
2262                 break;
2263         }
2264 
2265         for (j = 0; j < nr_tracks; j++) {
2266                 /* calculate cylinder and head for the current track */
2267                 set_ch_t(&address,
2268                          (fdata->start_unit + j) /
2269                          base_priv->rdc_data.trk_per_cyl,
2270                          (fdata->start_unit + j) %
2271                          base_priv->rdc_data.trk_per_cyl);
2272                 if (intensity & 0x01) { /* write record zero */
2273                         ect = (struct eckd_count *) data;
2274                         data += sizeof(struct eckd_count);
2275                         ect->cyl = address.cyl;
2276                         ect->head = address.head;
2277                         ect->record = 0;
2278                         ect->kl = 0;
2279                         ect->dl = 8;
2280                         ccw[-1].flags |= CCW_FLAG_CC;
2281                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2282                         ccw->flags = CCW_FLAG_SLI;
2283                         ccw->count = 8;
2284                         ccw->cda = (__u32)(addr_t) ect;
2285                         ccw++;
2286                 }
2287                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2288                         ect = (struct eckd_count *) data;
2289                         data += sizeof(struct eckd_count);
2290                         ect->cyl = address.cyl;
2291                         ect->head = address.head;
2292                         ect->record = 1;
2293                         ect->kl = 0;
2294                         ect->dl = 0;
2295                         ccw[-1].flags |= CCW_FLAG_CC;
2296                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2297                         ccw->flags = CCW_FLAG_SLI;
2298                         ccw->count = 8;
2299                         ccw->cda = (__u32)(addr_t) ect;
2300                 } else {                /* write remaining records */
2301                         for (i = 0; i < rpt; i++) {
2302                                 ect = (struct eckd_count *) data;
2303                                 data += sizeof(struct eckd_count);
2304                                 ect->cyl = address.cyl;
2305                                 ect->head = address.head;
2306                                 ect->record = i + 1;
2307                                 ect->kl = 0;
2308                                 ect->dl = fdata->blksize;
2309                                 /*
2310                                  * Check for special tracks 0-1
2311                                  * when formatting CDL
2312                                  */
2313                                 if ((intensity & 0x08) &&
2314                                     fdata->start_unit == 0) {
2315                                         if (i < 3) {
2316                                                 ect->kl = 4;
2317                                                 ect->dl = sizes_trk0[i] - 4;
2318                                         }
2319                                 }
2320                                 if ((intensity & 0x08) &&
2321                                     fdata->start_unit == 1) {
2322                                         ect->kl = 44;
2323                                         ect->dl = LABEL_SIZE - 44;
2324                                 }
2325                                 ccw[-1].flags |= CCW_FLAG_CC;
2326                                 if (i != 0 || j == 0)
2327                                         ccw->cmd_code =
2328                                                 DASD_ECKD_CCW_WRITE_CKD;
2329                                 else
2330                                         ccw->cmd_code =
2331                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2332                                 ccw->flags = CCW_FLAG_SLI;
2333                                 ccw->count = 8;
2334                                         ccw->cda = (__u32)(addr_t) ect;
2335                                         ccw++;
2336                         }
2337                 }
2338         }
2339 
2340         fcp->startdev = startdev;
2341         fcp->memdev = startdev;
2342         fcp->basedev = base;
2343         fcp->retries = 256;
2344         fcp->expires = startdev->default_expires * HZ;
2345         fcp->buildclk = get_tod_clock();
2346         fcp->status = DASD_CQR_FILLED;
2347 
2348         return fcp;
2349 }
2350 
2351 static int
2352 dasd_eckd_format_device(struct dasd_device *base,
2353                         struct format_data_t *fdata,
2354                         int enable_pav)
2355 {
2356         struct dasd_ccw_req *cqr, *n;
2357         struct dasd_block *block;
2358         struct dasd_eckd_private *private;
2359         struct list_head format_queue;
2360         struct dasd_device *device;
2361         int old_stop, format_step;
2362         int step, rc = 0, sleep_rc;
2363 
2364         block = base->block;
2365         private = (struct dasd_eckd_private *) base->private;
2366 
2367         /* Sanity checks. */
2368         if (fdata->start_unit >=
2369             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2370                 dev_warn(&base->cdev->dev,
2371                          "Start track number %u used in formatting is too big\n",
2372                          fdata->start_unit);
2373                 return -EINVAL;
2374         }
2375         if (fdata->stop_unit >=
2376             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2377                 dev_warn(&base->cdev->dev,
2378                          "Stop track number %u used in formatting is too big\n",
2379                          fdata->stop_unit);
2380                 return -EINVAL;
2381         }
2382         if (fdata->start_unit > fdata->stop_unit) {
2383                 dev_warn(&base->cdev->dev,
2384                          "Start track %u used in formatting exceeds end track\n",
2385                          fdata->start_unit);
2386                 return -EINVAL;
2387         }
2388         if (dasd_check_blocksize(fdata->blksize) != 0) {
2389                 dev_warn(&base->cdev->dev,
2390                          "The DASD cannot be formatted with block size %u\n",
2391                          fdata->blksize);
2392                 return -EINVAL;
2393         }
2394 
2395         INIT_LIST_HEAD(&format_queue);
2396 
2397         old_stop = fdata->stop_unit;
2398         while (fdata->start_unit <= 1) {
2399                 fdata->stop_unit = fdata->start_unit;
2400                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2401                 list_add(&cqr->blocklist, &format_queue);
2402 
2403                 fdata->stop_unit = old_stop;
2404                 fdata->start_unit++;
2405 
2406                 if (fdata->start_unit > fdata->stop_unit)
2407                         goto sleep;
2408         }
2409 
2410 retry:
2411         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2412                                            fdata->blksize);
2413         while (fdata->start_unit <= old_stop) {
2414                 step = fdata->stop_unit - fdata->start_unit + 1;
2415                 if (step > format_step)
2416                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2417 
2418                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2419                 if (IS_ERR(cqr)) {
2420                         if (PTR_ERR(cqr) == -ENOMEM) {
2421                                 /*
2422                                  * not enough memory available
2423                                  * go to out and start requests
2424                                  * retry after first requests were finished
2425                                  */
2426                                 fdata->stop_unit = old_stop;
2427                                 goto sleep;
2428                         } else
2429                                 return PTR_ERR(cqr);
2430                 }
2431                 list_add(&cqr->blocklist, &format_queue);
2432 
2433                 fdata->start_unit = fdata->stop_unit + 1;
2434                 fdata->stop_unit = old_stop;
2435         }
2436 
2437 sleep:
2438         sleep_rc = dasd_sleep_on_queue(&format_queue);
2439 
2440         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2441                 device = cqr->startdev;
2442                 private = (struct dasd_eckd_private *) device->private;
2443                 if (cqr->status == DASD_CQR_FAILED)
2444                         rc = -EIO;
2445                 list_del_init(&cqr->blocklist);
2446                 dasd_sfree_request(cqr, device);
2447                 private->count--;
2448         }
2449 
2450         if (sleep_rc)
2451                 return sleep_rc;
2452 
2453         /*
2454          * in case of ENOMEM we need to retry after
2455          * first requests are finished
2456          */
2457         if (fdata->start_unit <= fdata->stop_unit)
2458                 goto retry;
2459 
2460         return rc;
2461 }
2462 
2463 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2464 {
2465         if (cqr->retries < 0) {
2466                 cqr->status = DASD_CQR_FAILED;
2467                 return;
2468         }
2469         cqr->status = DASD_CQR_FILLED;
2470         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2471                 dasd_eckd_reset_ccw_to_base_io(cqr);
2472                 cqr->startdev = cqr->block->base;
2473                 cqr->lpm = cqr->block->base->path_data.opm;
2474         }
2475 };
2476 
2477 static dasd_erp_fn_t
2478 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2479 {
2480         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2481         struct ccw_device *cdev = device->cdev;
2482 
2483         switch (cdev->id.cu_type) {
2484         case 0x3990:
2485         case 0x2105:
2486         case 0x2107:
2487         case 0x1750:
2488                 return dasd_3990_erp_action;
2489         case 0x9343:
2490         case 0x3880:
2491         default:
2492                 return dasd_default_erp_action;
2493         }
2494 }
2495 
2496 static dasd_erp_fn_t
2497 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2498 {
2499         return dasd_default_erp_postaction;
2500 }
2501 
2502 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2503                                               struct dasd_ccw_req *cqr,
2504                                               struct irb *irb)
2505 {
2506         char mask;
2507         char *sense = NULL;
2508         struct dasd_eckd_private *private;
2509 
2510         private = (struct dasd_eckd_private *) device->private;
2511         /* first of all check for state change pending interrupt */
2512         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2513         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2514                 /*
2515                  * for alias only, not in offline processing
2516                  * and only if not suspended
2517                  */
2518                 if (!device->block && private->lcu &&
2519                     device->state == DASD_STATE_ONLINE &&
2520                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2521                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2522                         /*
2523                          * the state change could be caused by an alias
2524                          * reassignment remove device from alias handling
2525                          * to prevent new requests from being scheduled on
2526                          * the wrong alias device
2527                          */
2528                         dasd_alias_remove_device(device);
2529 
2530                         /* schedule worker to reload device */
2531                         dasd_reload_device(device);
2532                 }
2533                 dasd_generic_handle_state_change(device);
2534                 return;
2535         }
2536 
2537         sense = dasd_get_sense(irb);
2538         if (!sense)
2539                 return;
2540 
2541         /* summary unit check */
2542         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2543             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2544                 dasd_alias_handle_summary_unit_check(device, irb);
2545                 return;
2546         }
2547 
2548         /* service information message SIM */
2549         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2550             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2551                 dasd_3990_erp_handle_sim(device, sense);
2552                 return;
2553         }
2554 
2555         /* loss of device reservation is handled via base devices only
2556          * as alias devices may be used with several bases
2557          */
2558         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2559             (sense[7] == 0x3F) &&
2560             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2561             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2562                 if (device->features & DASD_FEATURE_FAILONSLCK)
2563                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2564                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2565                 dev_err(&device->cdev->dev,
2566                         "The device reservation was lost\n");
2567         }
2568 }
2569 
2570 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2571                                                struct dasd_device *startdev,
2572                                                struct dasd_block *block,
2573                                                struct request *req,
2574                                                sector_t first_rec,
2575                                                sector_t last_rec,
2576                                                sector_t first_trk,
2577                                                sector_t last_trk,
2578                                                unsigned int first_offs,
2579                                                unsigned int last_offs,
2580                                                unsigned int blk_per_trk,
2581                                                unsigned int blksize)
2582 {
2583         struct dasd_eckd_private *private;
2584         unsigned long *idaws;
2585         struct LO_eckd_data *LO_data;
2586         struct dasd_ccw_req *cqr;
2587         struct ccw1 *ccw;
2588         struct req_iterator iter;
2589         struct bio_vec bv;
2590         char *dst;
2591         unsigned int off;
2592         int count, cidaw, cplength, datasize;
2593         sector_t recid;
2594         unsigned char cmd, rcmd;
2595         int use_prefix;
2596         struct dasd_device *basedev;
2597 
2598         basedev = block->base;
2599         private = (struct dasd_eckd_private *) basedev->private;
2600         if (rq_data_dir(req) == READ)
2601                 cmd = DASD_ECKD_CCW_READ_MT;
2602         else if (rq_data_dir(req) == WRITE)
2603                 cmd = DASD_ECKD_CCW_WRITE_MT;
2604         else
2605                 return ERR_PTR(-EINVAL);
2606 
2607         /* Check struct bio and count the number of blocks for the request. */
2608         count = 0;
2609         cidaw = 0;
2610         rq_for_each_segment(bv, req, iter) {
2611                 if (bv.bv_len & (blksize - 1))
2612                         /* Eckd can only do full blocks. */
2613                         return ERR_PTR(-EINVAL);
2614                 count += bv.bv_len >> (block->s2b_shift + 9);
2615                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2616                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
2617         }
2618         /* Paranoia. */
2619         if (count != last_rec - first_rec + 1)
2620                 return ERR_PTR(-EINVAL);
2621 
2622         /* use the prefix command if available */
2623         use_prefix = private->features.feature[8] & 0x01;
2624         if (use_prefix) {
2625                 /* 1x prefix + number of blocks */
2626                 cplength = 2 + count;
2627                 /* 1x prefix + cidaws*sizeof(long) */
2628                 datasize = sizeof(struct PFX_eckd_data) +
2629                         sizeof(struct LO_eckd_data) +
2630                         cidaw * sizeof(unsigned long);
2631         } else {
2632                 /* 1x define extent + 1x locate record + number of blocks */
2633                 cplength = 2 + count;
2634                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2635                 datasize = sizeof(struct DE_eckd_data) +
2636                         sizeof(struct LO_eckd_data) +
2637                         cidaw * sizeof(unsigned long);
2638         }
2639         /* Find out the number of additional locate record ccws for cdl. */
2640         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2641                 if (last_rec >= 2*blk_per_trk)
2642                         count = 2*blk_per_trk - first_rec;
2643                 cplength += count;
2644                 datasize += count*sizeof(struct LO_eckd_data);
2645         }
2646         /* Allocate the ccw request. */
2647         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2648                                    startdev);
2649         if (IS_ERR(cqr))
2650                 return cqr;
2651         ccw = cqr->cpaddr;
2652         /* First ccw is define extent or prefix. */
2653         if (use_prefix) {
2654                 if (prefix(ccw++, cqr->data, first_trk,
2655                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2656                         /* Clock not in sync and XRC is enabled.
2657                          * Try again later.
2658                          */
2659                         dasd_sfree_request(cqr, startdev);
2660                         return ERR_PTR(-EAGAIN);
2661                 }
2662                 idaws = (unsigned long *) (cqr->data +
2663                                            sizeof(struct PFX_eckd_data));
2664         } else {
2665                 if (define_extent(ccw++, cqr->data, first_trk,
2666                                   last_trk, cmd, basedev) == -EAGAIN) {
2667                         /* Clock not in sync and XRC is enabled.
2668                          * Try again later.
2669                          */
2670                         dasd_sfree_request(cqr, startdev);
2671                         return ERR_PTR(-EAGAIN);
2672                 }
2673                 idaws = (unsigned long *) (cqr->data +
2674                                            sizeof(struct DE_eckd_data));
2675         }
2676         /* Build locate_record+read/write/ccws. */
2677         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2678         recid = first_rec;
2679         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2680                 /* Only standard blocks so there is just one locate record. */
2681                 ccw[-1].flags |= CCW_FLAG_CC;
2682                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2683                               last_rec - recid + 1, cmd, basedev, blksize);
2684         }
2685         rq_for_each_segment(bv, req, iter) {
2686                 dst = page_address(bv.bv_page) + bv.bv_offset;
2687                 if (dasd_page_cache) {
2688                         char *copy = kmem_cache_alloc(dasd_page_cache,
2689                                                       GFP_DMA | __GFP_NOWARN);
2690                         if (copy && rq_data_dir(req) == WRITE)
2691                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2692                         if (copy)
2693                                 dst = copy + bv.bv_offset;
2694                 }
2695                 for (off = 0; off < bv.bv_len; off += blksize) {
2696                         sector_t trkid = recid;
2697                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2698                         rcmd = cmd;
2699                         count = blksize;
2700                         /* Locate record for cdl special block ? */
2701                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2702                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2703                                         rcmd |= 0x8;
2704                                         count = dasd_eckd_cdl_reclen(recid);
2705                                         if (count < blksize &&
2706                                             rq_data_dir(req) == READ)
2707                                                 memset(dst + count, 0xe5,
2708                                                        blksize - count);
2709                                 }
2710                                 ccw[-1].flags |= CCW_FLAG_CC;
2711                                 locate_record(ccw++, LO_data++,
2712                                               trkid, recoffs + 1,
2713                                               1, rcmd, basedev, count);
2714                         }
2715                         /* Locate record for standard blocks ? */
2716                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2717                                 ccw[-1].flags |= CCW_FLAG_CC;
2718                                 locate_record(ccw++, LO_data++,
2719                                               trkid, recoffs + 1,
2720                                               last_rec - recid + 1,
2721                                               cmd, basedev, count);
2722                         }
2723                         /* Read/write ccw. */
2724                         ccw[-1].flags |= CCW_FLAG_CC;
2725                         ccw->cmd_code = rcmd;
2726                         ccw->count = count;
2727                         if (idal_is_needed(dst, blksize)) {
2728                                 ccw->cda = (__u32)(addr_t) idaws;
2729                                 ccw->flags = CCW_FLAG_IDA;
2730                                 idaws = idal_create_words(idaws, dst, blksize);
2731                         } else {
2732                                 ccw->cda = (__u32)(addr_t) dst;
2733                                 ccw->flags = 0;
2734                         }
2735                         ccw++;
2736                         dst += blksize;
2737                         recid++;
2738                 }
2739         }
2740         if (blk_noretry_request(req) ||
2741             block->base->features & DASD_FEATURE_FAILFAST)
2742                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2743         cqr->startdev = startdev;
2744         cqr->memdev = startdev;
2745         cqr->block = block;
2746         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2747         cqr->lpm = startdev->path_data.ppm;
2748         cqr->retries = startdev->default_retries;
2749         cqr->buildclk = get_tod_clock();
2750         cqr->status = DASD_CQR_FILLED;
2751         return cqr;
2752 }
2753 
2754 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2755                                                struct dasd_device *startdev,
2756                                                struct dasd_block *block,
2757                                                struct request *req,
2758                                                sector_t first_rec,
2759                                                sector_t last_rec,
2760                                                sector_t first_trk,
2761                                                sector_t last_trk,
2762                                                unsigned int first_offs,
2763                                                unsigned int last_offs,
2764                                                unsigned int blk_per_trk,
2765                                                unsigned int blksize)
2766 {
2767         unsigned long *idaws;
2768         struct dasd_ccw_req *cqr;
2769         struct ccw1 *ccw;
2770         struct req_iterator iter;
2771         struct bio_vec bv;
2772         char *dst, *idaw_dst;
2773         unsigned int cidaw, cplength, datasize;
2774         unsigned int tlf;
2775         sector_t recid;
2776         unsigned char cmd;
2777         struct dasd_device *basedev;
2778         unsigned int trkcount, count, count_to_trk_end;
2779         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2780         unsigned char new_track, end_idaw;
2781         sector_t trkid;
2782         unsigned int recoffs;
2783 
2784         basedev = block->base;
2785         if (rq_data_dir(req) == READ)
2786                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2787         else if (rq_data_dir(req) == WRITE)
2788                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2789         else
2790                 return ERR_PTR(-EINVAL);
2791 
2792         /* Track based I/O needs IDAWs for each page, and not just for
2793          * 64 bit addresses. We need additional idals for pages
2794          * that get filled from two tracks, so we use the number
2795          * of records as upper limit.
2796          */
2797         cidaw = last_rec - first_rec + 1;
2798         trkcount = last_trk - first_trk + 1;
2799 
2800         /* 1x prefix + one read/write ccw per track */
2801         cplength = 1 + trkcount;
2802 
2803         /* on 31-bit we need space for two 32 bit addresses per page
2804          * on 64-bit one 64 bit address
2805          */
2806         datasize = sizeof(struct PFX_eckd_data) +
2807                 cidaw * sizeof(unsigned long long);
2808 
2809         /* Allocate the ccw request. */
2810         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2811                                    startdev);
2812         if (IS_ERR(cqr))
2813                 return cqr;
2814         ccw = cqr->cpaddr;
2815         /* transfer length factor: how many bytes to read from the last track */
2816         if (first_trk == last_trk)
2817                 tlf = last_offs - first_offs + 1;
2818         else
2819                 tlf = last_offs + 1;
2820         tlf *= blksize;
2821 
2822         if (prefix_LRE(ccw++, cqr->data, first_trk,
2823                        last_trk, cmd, basedev, startdev,
2824                        1 /* format */, first_offs + 1,
2825                        trkcount, blksize,
2826                        tlf) == -EAGAIN) {
2827                 /* Clock not in sync and XRC is enabled.
2828                  * Try again later.
2829                  */
2830                 dasd_sfree_request(cqr, startdev);
2831                 return ERR_PTR(-EAGAIN);
2832         }
2833 
2834         /*
2835          * The translation of request into ccw programs must meet the
2836          * following conditions:
2837          * - all idaws but the first and the last must address full pages
2838          *   (or 2K blocks on 31-bit)
2839          * - the scope of a ccw and it's idal ends with the track boundaries
2840          */
2841         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2842         recid = first_rec;
2843         new_track = 1;
2844         end_idaw = 0;
2845         len_to_track_end = 0;
2846         idaw_dst = NULL;
2847         idaw_len = 0;
2848         rq_for_each_segment(bv, req, iter) {
2849                 dst = page_address(bv.bv_page) + bv.bv_offset;
2850                 seg_len = bv.bv_len;
2851                 while (seg_len) {
2852                         if (new_track) {
2853                                 trkid = recid;
2854                                 recoffs = sector_div(trkid, blk_per_trk);
2855                                 count_to_trk_end = blk_per_trk - recoffs;
2856                                 count = min((last_rec - recid + 1),
2857                                             (sector_t)count_to_trk_end);
2858                                 len_to_track_end = count * blksize;
2859                                 ccw[-1].flags |= CCW_FLAG_CC;
2860                                 ccw->cmd_code = cmd;
2861                                 ccw->count = len_to_track_end;
2862                                 ccw->cda = (__u32)(addr_t)idaws;
2863                                 ccw->flags = CCW_FLAG_IDA;
2864                                 ccw++;
2865                                 recid += count;
2866                                 new_track = 0;
2867                                 /* first idaw for a ccw may start anywhere */
2868                                 if (!idaw_dst)
2869                                         idaw_dst = dst;
2870                         }
2871                         /* If we start a new idaw, we must make sure that it
2872                          * starts on an IDA_BLOCK_SIZE boundary.
2873                          * If we continue an idaw, we must make sure that the
2874                          * current segment begins where the so far accumulated
2875                          * idaw ends
2876                          */
2877                         if (!idaw_dst) {
2878                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2879                                         dasd_sfree_request(cqr, startdev);
2880                                         return ERR_PTR(-ERANGE);
2881                                 } else
2882                                         idaw_dst = dst;
2883                         }
2884                         if ((idaw_dst + idaw_len) != dst) {
2885                                 dasd_sfree_request(cqr, startdev);
2886                                 return ERR_PTR(-ERANGE);
2887                         }
2888                         part_len = min(seg_len, len_to_track_end);
2889                         seg_len -= part_len;
2890                         dst += part_len;
2891                         idaw_len += part_len;
2892                         len_to_track_end -= part_len;
2893                         /* collected memory area ends on an IDA_BLOCK border,
2894                          * -> create an idaw
2895                          * idal_create_words will handle cases where idaw_len
2896                          * is larger then IDA_BLOCK_SIZE
2897                          */
2898                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2899                                 end_idaw = 1;
2900                         /* We also need to end the idaw at track end */
2901                         if (!len_to_track_end) {
2902                                 new_track = 1;
2903                                 end_idaw = 1;
2904                         }
2905                         if (end_idaw) {
2906                                 idaws = idal_create_words(idaws, idaw_dst,
2907                                                           idaw_len);
2908                                 idaw_dst = NULL;
2909                                 idaw_len = 0;
2910                                 end_idaw = 0;
2911                         }
2912                 }
2913         }
2914 
2915         if (blk_noretry_request(req) ||
2916             block->base->features & DASD_FEATURE_FAILFAST)
2917                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2918         cqr->startdev = startdev;
2919         cqr->memdev = startdev;
2920         cqr->block = block;
2921         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2922         cqr->lpm = startdev->path_data.ppm;
2923         cqr->retries = startdev->default_retries;
2924         cqr->buildclk = get_tod_clock();
2925         cqr->status = DASD_CQR_FILLED;
2926         return cqr;
2927 }
2928 
2929 static int prepare_itcw(struct itcw *itcw,
2930                         unsigned int trk, unsigned int totrk, int cmd,
2931                         struct dasd_device *basedev,
2932                         struct dasd_device *startdev,
2933                         unsigned int rec_on_trk, int count,
2934                         unsigned int blksize,
2935                         unsigned int total_data_size,
2936                         unsigned int tlf,
2937                         unsigned int blk_per_trk)
2938 {
2939         struct PFX_eckd_data pfxdata;
2940         struct dasd_eckd_private *basepriv, *startpriv;
2941         struct DE_eckd_data *dedata;
2942         struct LRE_eckd_data *lredata;
2943         struct dcw *dcw;
2944 
2945         u32 begcyl, endcyl;
2946         u16 heads, beghead, endhead;
2947         u8 pfx_cmd;
2948 
2949         int rc = 0;
2950         int sector = 0;
2951         int dn, d;
2952 
2953 
2954         /* setup prefix data */
2955         basepriv = (struct dasd_eckd_private *) basedev->private;
2956         startpriv = (struct dasd_eckd_private *) startdev->private;
2957         dedata = &pfxdata.define_extent;
2958         lredata = &pfxdata.locate_record;
2959 
2960         memset(&pfxdata, 0, sizeof(pfxdata));
2961         pfxdata.format = 1; /* PFX with LRE */
2962         pfxdata.base_address = basepriv->ned->unit_addr;
2963         pfxdata.base_lss = basepriv->ned->ID;
2964         pfxdata.validity.define_extent = 1;
2965 
2966         /* private uid is kept up to date, conf_data may be outdated */
2967         if (startpriv->uid.type != UA_BASE_DEVICE) {
2968                 pfxdata.validity.verify_base = 1;
2969                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2970                         pfxdata.validity.hyper_pav = 1;
2971         }
2972 
2973         switch (cmd) {
2974         case DASD_ECKD_CCW_READ_TRACK_DATA:
2975                 dedata->mask.perm = 0x1;
2976                 dedata->attributes.operation = basepriv->attrib.operation;
2977                 dedata->blk_size = blksize;
2978                 dedata->ga_extended |= 0x42;
2979                 lredata->operation.orientation = 0x0;
2980                 lredata->operation.operation = 0x0C;
2981                 lredata->auxiliary.check_bytes = 0x01;
2982                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2983                 break;
2984         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2985                 dedata->mask.perm = 0x02;
2986                 dedata->attributes.operation = basepriv->attrib.operation;
2987                 dedata->blk_size = blksize;
2988                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2989                 dedata->ga_extended |= 0x42;
2990                 lredata->operation.orientation = 0x0;
2991                 lredata->operation.operation = 0x3F;
2992                 lredata->extended_operation = 0x23;
2993                 lredata->auxiliary.check_bytes = 0x2;
2994                 pfx_cmd = DASD_ECKD_CCW_PFX;
2995                 break;
2996         default:
2997                 DBF_DEV_EVENT(DBF_ERR, basedev,
2998                               "prepare itcw, unknown opcode 0x%x", cmd);
2999                 BUG();
3000                 break;
3001         }
3002         if (rc)
3003                 return rc;
3004 
3005         dedata->attributes.mode = 0x3;  /* ECKD */
3006 
3007         heads = basepriv->rdc_data.trk_per_cyl;
3008         begcyl = trk / heads;
3009         beghead = trk % heads;
3010         endcyl = totrk / heads;
3011         endhead = totrk % heads;
3012 
3013         /* check for sequential prestage - enhance cylinder range */
3014         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3015             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3016 
3017                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3018                         endcyl += basepriv->attrib.nr_cyl;
3019                 else
3020                         endcyl = (basepriv->real_cyl - 1);
3021         }
3022 
3023         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3024         set_ch_t(&dedata->end_ext, endcyl, endhead);
3025 
3026         dedata->ep_format = 0x20; /* records per track is valid */
3027         dedata->ep_rec_per_track = blk_per_trk;
3028 
3029         if (rec_on_trk) {
3030                 switch (basepriv->rdc_data.dev_type) {
3031                 case 0x3390:
3032                         dn = ceil_quot(blksize + 6, 232);
3033                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3034                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3035                         break;
3036                 case 0x3380:
3037                         d = 7 + ceil_quot(blksize + 12, 32);
3038                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3039                         break;
3040                 }
3041         }
3042 
3043         lredata->auxiliary.length_valid = 1;
3044         lredata->auxiliary.length_scope = 1;
3045         lredata->auxiliary.imbedded_ccw_valid = 1;
3046         lredata->length = tlf;
3047         lredata->imbedded_ccw = cmd;
3048         lredata->count = count;
3049         lredata->sector = sector;
3050         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3051         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3052         lredata->search_arg.head = lredata->seek_addr.head;
3053         lredata->search_arg.record = rec_on_trk;
3054 
3055         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3056                      &pfxdata, sizeof(pfxdata), total_data_size);
3057         return PTR_RET(dcw);
3058 }
3059 
3060 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3061                                                struct dasd_device *startdev,
3062                                                struct dasd_block *block,
3063                                                struct request *req,
3064                                                sector_t first_rec,
3065                                                sector_t last_rec,
3066                                                sector_t first_trk,
3067                                                sector_t last_trk,
3068                                                unsigned int first_offs,
3069                                                unsigned int last_offs,
3070                                                unsigned int blk_per_trk,
3071                                                unsigned int blksize)
3072 {
3073         struct dasd_ccw_req *cqr;
3074         struct req_iterator iter;
3075         struct bio_vec bv;
3076         char *dst;
3077         unsigned int trkcount, ctidaw;
3078         unsigned char cmd;
3079         struct dasd_device *basedev;
3080         unsigned int tlf;
3081         struct itcw *itcw;
3082         struct tidaw *last_tidaw = NULL;
3083         int itcw_op;
3084         size_t itcw_size;
3085         u8 tidaw_flags;
3086         unsigned int seg_len, part_len, len_to_track_end;
3087         unsigned char new_track;
3088         sector_t recid, trkid;
3089         unsigned int offs;
3090         unsigned int count, count_to_trk_end;
3091         int ret;
3092 
3093         basedev = block->base;
3094         if (rq_data_dir(req) == READ) {
3095                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3096                 itcw_op = ITCW_OP_READ;
3097         } else if (rq_data_dir(req) == WRITE) {
3098                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3099                 itcw_op = ITCW_OP_WRITE;
3100         } else
3101                 return ERR_PTR(-EINVAL);
3102 
3103         /* trackbased I/O needs address all memory via TIDAWs,
3104          * not just for 64 bit addresses. This allows us to map
3105          * each segment directly to one tidaw.
3106          * In the case of write requests, additional tidaws may
3107          * be needed when a segment crosses a track boundary.
3108          */
3109         trkcount = last_trk - first_trk + 1;
3110         ctidaw = 0;
3111         rq_for_each_segment(bv, req, iter) {
3112                 ++ctidaw;
3113         }
3114         if (rq_data_dir(req) == WRITE)
3115                 ctidaw += (last_trk - first_trk);
3116 
3117         /* Allocate the ccw request. */
3118         itcw_size = itcw_calc_size(0, ctidaw, 0);
3119         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3120         if (IS_ERR(cqr))
3121                 return cqr;
3122 
3123         /* transfer length factor: how many bytes to read from the last track */
3124         if (first_trk == last_trk)
3125                 tlf = last_offs - first_offs + 1;
3126         else
3127                 tlf = last_offs + 1;
3128         tlf *= blksize;
3129 
3130         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3131         if (IS_ERR(itcw)) {
3132                 ret = -EINVAL;
3133                 goto out_error;
3134         }
3135         cqr->cpaddr = itcw_get_tcw(itcw);
3136         if (prepare_itcw(itcw, first_trk, last_trk,
3137                          cmd, basedev, startdev,
3138                          first_offs + 1,
3139                          trkcount, blksize,
3140                          (last_rec - first_rec + 1) * blksize,
3141                          tlf, blk_per_trk) == -EAGAIN) {
3142                 /* Clock not in sync and XRC is enabled.
3143                  * Try again later.
3144                  */
3145                 ret = -EAGAIN;
3146                 goto out_error;
3147         }
3148         len_to_track_end = 0;
3149         /*
3150          * A tidaw can address 4k of memory, but must not cross page boundaries
3151          * We can let the block layer handle this by setting
3152          * blk_queue_segment_boundary to page boundaries and
3153          * blk_max_segment_size to page size when setting up the request queue.
3154          * For write requests, a TIDAW must not cross track boundaries, because
3155          * we have to set the CBC flag on the last tidaw for each track.
3156          */
3157         if (rq_data_dir(req) == WRITE) {
3158                 new_track = 1;
3159                 recid = first_rec;
3160                 rq_for_each_segment(bv, req, iter) {
3161                         dst = page_address(bv.bv_page) + bv.bv_offset;
3162                         seg_len = bv.bv_len;
3163                         while (seg_len) {
3164                                 if (new_track) {
3165                                         trkid = recid;
3166                                         offs = sector_div(trkid, blk_per_trk);
3167                                         count_to_trk_end = blk_per_trk - offs;
3168                                         count = min((last_rec - recid + 1),
3169                                                     (sector_t)count_to_trk_end);
3170                                         len_to_track_end = count * blksize;
3171                                         recid += count;
3172                                         new_track = 0;
3173                                 }
3174                                 part_len = min(seg_len, len_to_track_end);
3175                                 seg_len -= part_len;
3176                                 len_to_track_end -= part_len;
3177                                 /* We need to end the tidaw at track end */
3178                                 if (!len_to_track_end) {
3179                                         new_track = 1;
3180                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3181                                 } else
3182                                         tidaw_flags = 0;
3183                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3184                                                             dst, part_len);
3185                                 if (IS_ERR(last_tidaw)) {
3186                                         ret = -EINVAL;
3187                                         goto out_error;
3188                                 }
3189                                 dst += part_len;
3190                         }
3191                 }
3192         } else {
3193                 rq_for_each_segment(bv, req, iter) {
3194                         dst = page_address(bv.bv_page) + bv.bv_offset;
3195                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3196                                                     dst, bv.bv_len);
3197                         if (IS_ERR(last_tidaw)) {
3198                                 ret = -EINVAL;
3199                                 goto out_error;
3200                         }
3201                 }
3202         }
3203         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3204         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3205         itcw_finalize(itcw);
3206 
3207         if (blk_noretry_request(req) ||
3208             block->base->features & DASD_FEATURE_FAILFAST)
3209                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3210         cqr->cpmode = 1;
3211         cqr->startdev = startdev;
3212         cqr->memdev = startdev;
3213         cqr->block = block;
3214         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3215         cqr->lpm = startdev->path_data.ppm;
3216         cqr->retries = startdev->default_retries;
3217         cqr->buildclk = get_tod_clock();
3218         cqr->status = DASD_CQR_FILLED;
3219         return cqr;
3220 out_error:
3221         dasd_sfree_request(cqr, startdev);
3222         return ERR_PTR(ret);
3223 }
3224 
3225 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3226                                                struct dasd_block *block,
3227                                                struct request *req)
3228 {
3229         int cmdrtd, cmdwtd;
3230         int use_prefix;
3231         int fcx_multitrack;
3232         struct dasd_eckd_private *private;
3233         struct dasd_device *basedev;
3234         sector_t first_rec, last_rec;
3235         sector_t first_trk, last_trk;
3236         unsigned int first_offs, last_offs;
3237         unsigned int blk_per_trk, blksize;
3238         int cdlspecial;
3239         unsigned int data_size;
3240         struct dasd_ccw_req *cqr;
3241 
3242         basedev = block->base;
3243         private = (struct dasd_eckd_private *) basedev->private;
3244 
3245         /* Calculate number of blocks/records per track. */
3246         blksize = block->bp_block;
3247         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3248         if (blk_per_trk == 0)
3249                 return ERR_PTR(-EINVAL);
3250         /* Calculate record id of first and last block. */
3251         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3252         first_offs = sector_div(first_trk, blk_per_trk);
3253         last_rec = last_trk =
3254                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3255         last_offs = sector_div(last_trk, blk_per_trk);
3256         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3257 
3258         fcx_multitrack = private->features.feature[40] & 0x20;
3259         data_size = blk_rq_bytes(req);
3260         if (data_size % blksize)
3261                 return ERR_PTR(-EINVAL);
3262         /* tpm write request add CBC data on each track boundary */
3263         if (rq_data_dir(req) == WRITE)
3264                 data_size += (last_trk - first_trk) * 4;
3265 
3266         /* is read track data and write track data in command mode supported? */
3267         cmdrtd = private->features.feature[9] & 0x20;
3268         cmdwtd = private->features.feature[12] & 0x40;
3269         use_prefix = private->features.feature[8] & 0x01;
3270 
3271         cqr = NULL;
3272         if (cdlspecial || dasd_page_cache) {
3273                 /* do nothing, just fall through to the cmd mode single case */
3274         } else if ((data_size <= private->fcx_max_data)
3275                    && (fcx_multitrack || (first_trk == last_trk))) {
3276                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3277                                                     first_rec, last_rec,
3278                                                     first_trk, last_trk,
3279                                                     first_offs, last_offs,
3280                                                     blk_per_trk, blksize);
3281                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3282                     (PTR_ERR(cqr) != -ENOMEM))
3283                         cqr = NULL;
3284         } else if (use_prefix &&
3285                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3286                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3287                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3288                                                    first_rec, last_rec,
3289                                                    first_trk, last_trk,
3290                                                    first_offs, last_offs,
3291                                                    blk_per_trk, blksize);
3292                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3293                     (PTR_ERR(cqr) != -ENOMEM))
3294                         cqr = NULL;
3295         }
3296         if (!cqr)
3297                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3298                                                     first_rec, last_rec,
3299                                                     first_trk, last_trk,
3300                                                     first_offs, last_offs,
3301                                                     blk_per_trk, blksize);
3302         return cqr;
3303 }
3304 
3305 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3306                                                struct dasd_block *block,
3307                                                struct request *req)
3308 {
3309         unsigned long *idaws;
3310         struct dasd_device *basedev;
3311         struct dasd_ccw_req *cqr;
3312         struct ccw1 *ccw;
3313         struct req_iterator iter;
3314         struct bio_vec bv;
3315         char *dst;
3316         unsigned char cmd;
3317         unsigned int trkcount;
3318         unsigned int seg_len, len_to_track_end;
3319         unsigned int first_offs;
3320         unsigned int cidaw, cplength, datasize;
3321         sector_t first_trk, last_trk, sectors;
3322         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3323         unsigned int pfx_datasize;
3324 
3325         /*
3326          * raw track access needs to be mutiple of 64k and on 64k boundary
3327          * For read requests we can fix an incorrect alignment by padding
3328          * the request with dummy pages.
3329          */
3330         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3331         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3332                 DASD_RAW_SECTORS_PER_TRACK;
3333         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3334                 DASD_RAW_SECTORS_PER_TRACK;
3335         basedev = block->base;
3336         if ((start_padding_sectors || end_padding_sectors) &&
3337             (rq_data_dir(req) == WRITE)) {
3338                 DBF_DEV_EVENT(DBF_ERR, basedev,
3339                               "raw write not track aligned (%lu,%lu) req %p",
3340                               start_padding_sectors, end_padding_sectors, req);
3341                 cqr = ERR_PTR(-EINVAL);
3342                 goto out;
3343         }
3344 
3345         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3346         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3347                 DASD_RAW_SECTORS_PER_TRACK;
3348         trkcount = last_trk - first_trk + 1;
3349         first_offs = 0;
3350 
3351         if (rq_data_dir(req) == READ)
3352                 cmd = DASD_ECKD_CCW_READ_TRACK;
3353         else if (rq_data_dir(req) == WRITE)
3354                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3355         else {
3356                 cqr = ERR_PTR(-EINVAL);
3357                 goto out;
3358         }
3359 
3360         /*
3361          * Raw track based I/O needs IDAWs for each page,
3362          * and not just for 64 bit addresses.
3363          */
3364         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3365 
3366         /* 1x prefix + one read/write ccw per track */
3367         cplength = 1 + trkcount;
3368 
3369         /*
3370          * struct PFX_eckd_data has up to 2 byte as extended parameter
3371          * this is needed for write full track and has to be mentioned
3372          * separately
3373          * add 8 instead of 2 to keep 8 byte boundary
3374          */
3375         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3376 
3377         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3378 
3379         /* Allocate the ccw request. */
3380         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3381                                    datasize, startdev);
3382         if (IS_ERR(cqr))
3383                 goto out;
3384         ccw = cqr->cpaddr;
3385 
3386         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3387                        basedev, startdev, 1 /* format */, first_offs + 1,
3388                        trkcount, 0, 0) == -EAGAIN) {
3389                 /* Clock not in sync and XRC is enabled.
3390                  * Try again later.
3391                  */
3392                 dasd_sfree_request(cqr, startdev);
3393                 cqr = ERR_PTR(-EAGAIN);
3394                 goto out;
3395         }
3396 
3397         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3398         len_to_track_end = 0;
3399         if (start_padding_sectors) {
3400                 ccw[-1].flags |= CCW_FLAG_CC;
3401                 ccw->cmd_code = cmd;
3402                 /* maximum 3390 track size */
3403                 ccw->count = 57326;
3404                 /* 64k map to one track */
3405                 len_to_track_end = 65536 - start_padding_sectors * 512;
3406                 ccw->cda = (__u32)(addr_t)idaws;
3407                 ccw->flags |= CCW_FLAG_IDA;
3408                 ccw->flags |= CCW_FLAG_SLI;
3409                 ccw++;
3410                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3411                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3412         }
3413         rq_for_each_segment(bv, req, iter) {
3414                 dst = page_address(bv.bv_page) + bv.bv_offset;
3415                 seg_len = bv.bv_len;
3416                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3417                         memset(dst, 0, seg_len);
3418                 if (!len_to_track_end) {
3419                         ccw[-1].flags |= CCW_FLAG_CC;
3420                         ccw->cmd_code = cmd;
3421                         /* maximum 3390 track size */
3422                         ccw->count = 57326;
3423                         /* 64k map to one track */
3424                         len_to_track_end = 65536;
3425                         ccw->cda = (__u32)(addr_t)idaws;
3426                         ccw->flags |= CCW_FLAG_IDA;
3427                         ccw->flags |= CCW_FLAG_SLI;
3428                         ccw++;
3429                 }
3430                 len_to_track_end -= seg_len;
3431                 idaws = idal_create_words(idaws, dst, seg_len);
3432         }
3433         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3434                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3435         if (blk_noretry_request(req) ||
3436             block->base->features & DASD_FEATURE_FAILFAST)
3437                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3438         cqr->startdev = startdev;
3439         cqr->memdev = startdev;
3440         cqr->block = block;
3441         cqr->expires = startdev->default_expires * HZ;
3442         cqr->lpm = startdev->path_data.ppm;
3443         cqr->retries = startdev->default_retries;
3444         cqr->buildclk = get_tod_clock();
3445         cqr->status = DASD_CQR_FILLED;
3446 
3447         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3448                 cqr = NULL;
3449 out:
3450         return cqr;
3451 }
3452 
3453 
3454 static int
3455 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3456 {
3457         struct dasd_eckd_private *private;
3458         struct ccw1 *ccw;
3459         struct req_iterator iter;
3460         struct bio_vec bv;
3461         char *dst, *cda;
3462         unsigned int blksize, blk_per_trk, off;
3463         sector_t recid;
3464         int status;
3465 
3466         if (!dasd_page_cache)
3467                 goto out;
3468         private = (struct dasd_eckd_private *) cqr->block->base->private;
3469         blksize = cqr->block->bp_block;
3470         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3471         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3472         ccw = cqr->cpaddr;
3473         /* Skip over define extent & locate record. */
3474         ccw++;
3475         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3476                 ccw++;
3477         rq_for_each_segment(bv, req, iter) {
3478                 dst = page_address(bv.bv_page) + bv.bv_offset;
3479                 for (off = 0; off < bv.bv_len; off += blksize) {
3480                         /* Skip locate record. */
3481                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3482                                 ccw++;
3483                         if (dst) {
3484                                 if (ccw->flags & CCW_FLAG_IDA)
3485                                         cda = *((char **)((addr_t) ccw->cda));
3486                                 else
3487                                         cda = (char *)((addr_t) ccw->cda);
3488                                 if (dst != cda) {
3489                                         if (rq_data_dir(req) == READ)
3490                                                 memcpy(dst, cda, bv.bv_len);
3491                                         kmem_cache_free(dasd_page_cache,
3492                                             (void *)((addr_t)cda & PAGE_MASK));
3493                                 }
3494                                 dst = NULL;
3495                         }
3496                         ccw++;
3497                         recid++;
3498                 }
3499         }
3500 out:
3501         status = cqr->status == DASD_CQR_DONE;
3502         dasd_sfree_request(cqr, cqr->memdev);
3503         return status;
3504 }
3505 
3506 /*
3507  * Modify ccw/tcw in cqr so it can be started on a base device.
3508  *
3509  * Note that this is not enough to restart the cqr!
3510  * Either reset cqr->startdev as well (summary unit check handling)
3511  * or restart via separate cqr (as in ERP handling).
3512  */
3513 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3514 {
3515         struct ccw1 *ccw;
3516         struct PFX_eckd_data *pfxdata;
3517         struct tcw *tcw;
3518         struct tccb *tccb;
3519         struct dcw *dcw;
3520 
3521         if (cqr->cpmode == 1) {
3522                 tcw = cqr->cpaddr;
3523                 tccb = tcw_get_tccb(tcw);
3524                 dcw = (struct dcw *)&tccb->tca[0];
3525                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3526                 pfxdata->validity.verify_base = 0;
3527                 pfxdata->validity.hyper_pav = 0;
3528         } else {
3529                 ccw = cqr->cpaddr;
3530                 pfxdata = cqr->data;
3531                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3532                         pfxdata->validity.verify_base = 0;
3533                         pfxdata->validity.hyper_pav = 0;
3534                 }
3535         }
3536 }
3537 
3538 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3539 
3540 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3541                                                      struct dasd_block *block,
3542                                                      struct request *req)
3543 {
3544         struct dasd_eckd_private *private;
3545         struct dasd_device *startdev;
3546         unsigned long flags;
3547         struct dasd_ccw_req *cqr;
3548 
3549         startdev = dasd_alias_get_start_dev(base);
3550         if (!startdev)
3551                 startdev = base;
3552         private = (struct dasd_eckd_private *) startdev->private;
3553         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3554                 return ERR_PTR(-EBUSY);
3555 
3556         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3557         private->count++;
3558         if ((base->features & DASD_FEATURE_USERAW))
3559                 cqr = dasd_raw_build_cp(startdev, block, req);
3560         else
3561                 cqr = dasd_eckd_build_cp(startdev, block, req);
3562         if (IS_ERR(cqr))
3563                 private->count--;
3564         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3565         return cqr;
3566 }
3567 
3568 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3569                                    struct request *req)
3570 {
3571         struct dasd_eckd_private *private;
3572         unsigned long flags;
3573 
3574         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3575         private = (struct dasd_eckd_private *) cqr->memdev->private;
3576         private->count--;
3577         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3578         return dasd_eckd_free_cp(cqr, req);
3579 }
3580 
3581 static int
3582 dasd_eckd_fill_info(struct dasd_device * device,
3583                     struct dasd_information2_t * info)
3584 {
3585         struct dasd_eckd_private *private;
3586 
3587         private = (struct dasd_eckd_private *) device->private;
3588         info->label_block = 2;
3589         info->FBA_layout = private->uses_cdl ? 0 : 1;
3590         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3591         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3592         memcpy(info->characteristics, &private->rdc_data,
3593                sizeof(struct dasd_eckd_characteristics));
3594         info->confdata_size = min((unsigned long)private->conf_len,
3595                                   sizeof(info->configuration_data));
3596         memcpy(info->configuration_data, private->conf_data,
3597                info->confdata_size);
3598         return 0;
3599 }
3600 
3601 /*
3602  * SECTION: ioctl functions for eckd devices.
3603  */
3604 
3605 /*
3606  * Release device ioctl.
3607  * Buils a channel programm to releases a prior reserved
3608  * (see dasd_eckd_reserve) device.
3609  */
3610 static int
3611 dasd_eckd_release(struct dasd_device *device)
3612 {
3613         struct dasd_ccw_req *cqr;
3614         int rc;
3615         struct ccw1 *ccw;
3616         int useglobal;
3617 
3618         if (!capable(CAP_SYS_ADMIN))
3619                 return -EACCES;
3620 
3621         useglobal = 0;
3622         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3623         if (IS_ERR(cqr)) {
3624                 mutex_lock(&dasd_reserve_mutex);
3625                 useglobal = 1;
3626                 cqr = &dasd_reserve_req->cqr;
3627                 memset(cqr, 0, sizeof(*cqr));
3628                 memset(&dasd_reserve_req->ccw, 0,
3629                        sizeof(dasd_reserve_req->ccw));
3630                 cqr->cpaddr = &dasd_reserve_req->ccw;
3631                 cqr->data = &dasd_reserve_req->data;
3632                 cqr->magic = DASD_ECKD_MAGIC;
3633         }
3634         ccw = cqr->cpaddr;
3635         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3636         ccw->flags |= CCW_FLAG_SLI;
3637         ccw->count = 32;
3638         ccw->cda = (__u32)(addr_t) cqr->data;
3639         cqr->startdev = device;
3640         cqr->memdev = device;
3641         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3642         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3643         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3644         cqr->expires = 2 * HZ;
3645         cqr->buildclk = get_tod_clock();
3646         cqr->status = DASD_CQR_FILLED;
3647 
3648         rc = dasd_sleep_on_immediatly(cqr);
3649         if (!rc)
3650                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3651 
3652         if (useglobal)
3653                 mutex_unlock(&dasd_reserve_mutex);
3654         else
3655                 dasd_sfree_request(cqr, cqr->memdev);
3656         return rc;
3657 }
3658 
3659 /*
3660  * Reserve device ioctl.
3661  * Options are set to 'synchronous wait for interrupt' and
3662  * 'timeout the request'. This leads to a terminate IO if
3663  * the interrupt is outstanding for a certain time.
3664  */
3665 static int
3666 dasd_eckd_reserve(struct dasd_device *device)
3667 {
3668         struct dasd_ccw_req *cqr;
3669         int rc;
3670         struct ccw1 *ccw;
3671         int useglobal;
3672 
3673         if (!capable(CAP_SYS_ADMIN))
3674                 return -EACCES;
3675 
3676         useglobal = 0;
3677         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3678         if (IS_ERR(cqr)) {
3679                 mutex_lock(&dasd_reserve_mutex);
3680                 useglobal = 1;
3681                 cqr = &dasd_reserve_req->cqr;
3682                 memset(cqr, 0, sizeof(*cqr));
3683                 memset(&dasd_reserve_req->ccw, 0,
3684                        sizeof(dasd_reserve_req->ccw));
3685                 cqr->cpaddr = &dasd_reserve_req->ccw;
3686                 cqr->data = &dasd_reserve_req->data;
3687                 cqr->magic = DASD_ECKD_MAGIC;
3688         }
3689         ccw = cqr->cpaddr;
3690         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3691         ccw->flags |= CCW_FLAG_SLI;
3692         ccw->count = 32;
3693         ccw->cda = (__u32)(addr_t) cqr->data;
3694         cqr->startdev = device;
3695         cqr->memdev = device;
3696         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3697         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3698         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3699         cqr->expires = 2 * HZ;
3700         cqr->buildclk = get_tod_clock();
3701         cqr->status = DASD_CQR_FILLED;
3702 
3703         rc = dasd_sleep_on_immediatly(cqr);
3704         if (!rc)
3705                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3706 
3707         if (useglobal)
3708                 mutex_unlock(&dasd_reserve_mutex);
3709         else
3710                 dasd_sfree_request(cqr, cqr->memdev);
3711         return rc;
3712 }
3713 
3714 /*
3715  * Steal lock ioctl - unconditional reserve device.
3716  * Buils a channel programm to break a device's reservation.
3717  * (unconditional reserve)
3718  */
3719 static int
3720 dasd_eckd_steal_lock(struct dasd_device *device)
3721 {
3722         struct dasd_ccw_req *cqr;
3723         int rc;
3724         struct ccw1 *ccw;
3725         int useglobal;
3726 
3727         if (!capable(CAP_SYS_ADMIN))
3728                 return -EACCES;
3729 
3730         useglobal = 0;
3731         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3732         if (IS_ERR(cqr)) {
3733                 mutex_lock(&dasd_reserve_mutex);
3734                 useglobal = 1;
3735                 cqr = &dasd_reserve_req->cqr;
3736                 memset(cqr, 0, sizeof(*cqr));
3737                 memset(&dasd_reserve_req->ccw, 0,
3738                        sizeof(dasd_reserve_req->ccw));
3739                 cqr->cpaddr = &dasd_reserve_req->ccw;
3740                 cqr->data = &dasd_reserve_req->data;
3741                 cqr->magic = DASD_ECKD_MAGIC;
3742         }
3743         ccw = cqr->cpaddr;
3744         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3745         ccw->flags |= CCW_FLAG_SLI;
3746         ccw->count = 32;
3747         ccw->cda = (__u32)(addr_t) cqr->data;
3748         cqr->startdev = device;
3749         cqr->memdev = device;
3750         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3751         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3752         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3753         cqr->expires = 2 * HZ;
3754         cqr->buildclk = get_tod_clock();
3755         cqr->status = DASD_CQR_FILLED;
3756 
3757         rc = dasd_sleep_on_immediatly(cqr);
3758         if (!rc)
3759                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3760 
3761         if (useglobal)
3762                 mutex_unlock(&dasd_reserve_mutex);
3763         else
3764                 dasd_sfree_request(cqr, cqr->memdev);
3765         return rc;
3766 }
3767 
3768 /*
3769  * SNID - Sense Path Group ID
3770  * This ioctl may be used in situations where I/O is stalled due to
3771  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3772  * preallocated dasd_reserve_req.
3773  */
3774 static int dasd_eckd_snid(struct dasd_device *device,
3775                           void __user *argp)
3776 {
3777         struct dasd_ccw_req *cqr;
3778         int rc;
3779         struct ccw1 *ccw;
3780         int useglobal;
3781         struct dasd_snid_ioctl_data usrparm;
3782 
3783         if (!capable(CAP_SYS_ADMIN))
3784                 return -EACCES;
3785 
3786         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3787                 return -EFAULT;
3788 
3789         useglobal = 0;
3790         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3791                                    sizeof(struct dasd_snid_data), device);
3792         if (IS_ERR(cqr)) {
3793                 mutex_lock(&dasd_reserve_mutex);
3794                 useglobal = 1;
3795                 cqr = &dasd_reserve_req->cqr;
3796                 memset(cqr, 0, sizeof(*cqr));
3797                 memset(&dasd_reserve_req->ccw, 0,
3798                        sizeof(dasd_reserve_req->ccw));
3799                 cqr->cpaddr = &dasd_reserve_req->ccw;
3800                 cqr->data = &dasd_reserve_req->data;
3801                 cqr->magic = DASD_ECKD_MAGIC;
3802         }
3803         ccw = cqr->cpaddr;
3804         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3805         ccw->flags |= CCW_FLAG_SLI;
3806         ccw->count = 12;
3807         ccw->cda = (__u32)(addr_t) cqr->data;
3808         cqr->startdev = device;
3809         cqr->memdev = device;
3810         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3811         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3812         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3813         cqr->retries = 5;
3814         cqr->expires = 10 * HZ;
3815         cqr->buildclk = get_tod_clock();
3816         cqr->status = DASD_CQR_FILLED;
3817         cqr->lpm = usrparm.path_mask;
3818 
3819         rc = dasd_sleep_on_immediatly(cqr);
3820         /* verify that I/O processing didn't modify the path mask */
3821         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3822                 rc = -EIO;
3823         if (!rc) {
3824                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3825                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3826                         rc = -EFAULT;
3827         }
3828 
3829         if (useglobal)
3830                 mutex_unlock(&dasd_reserve_mutex);
3831         else
3832                 dasd_sfree_request(cqr, cqr->memdev);
3833         return rc;
3834 }
3835 
3836 /*
3837  * Read performance statistics
3838  */
3839 static int
3840 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3841 {
3842         struct dasd_psf_prssd_data *prssdp;
3843         struct dasd_rssd_perf_stats_t *stats;
3844         struct dasd_ccw_req *cqr;
3845         struct ccw1 *ccw;
3846         int rc;
3847 
3848         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3849                                    (sizeof(struct dasd_psf_prssd_data) +
3850                                     sizeof(struct dasd_rssd_perf_stats_t)),
3851                                    device);
3852         if (IS_ERR(cqr)) {
3853                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3854                             "Could not allocate initialization request");
3855                 return PTR_ERR(cqr);
3856         }
3857         cqr->startdev = device;
3858         cqr->memdev = device;
3859         cqr->retries = 0;
3860         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3861         cqr->expires = 10 * HZ;
3862 
3863         /* Prepare for Read Subsystem Data */
3864         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3865         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3866         prssdp->order = PSF_ORDER_PRSSD;
3867         prssdp->suborder = 0x01;        /* Performance Statistics */
3868         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3869 
3870         ccw = cqr->cpaddr;
3871         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3872         ccw->count = sizeof(struct dasd_psf_prssd_data);
3873         ccw->flags |= CCW_FLAG_CC;
3874         ccw->cda = (__u32)(addr_t) prssdp;
3875 
3876         /* Read Subsystem Data - Performance Statistics */
3877         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3878         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3879 
3880         ccw++;
3881         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3882         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3883         ccw->cda = (__u32)(addr_t) stats;
3884 
3885         cqr->buildclk = get_tod_clock();
3886         cqr->status = DASD_CQR_FILLED;
3887         rc = dasd_sleep_on(cqr);
3888         if (rc == 0) {
3889                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3890                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3891                 if (copy_to_user(argp, stats,
3892                                  sizeof(struct dasd_rssd_perf_stats_t)))
3893                         rc = -EFAULT;
3894         }
3895         dasd_sfree_request(cqr, cqr->memdev);
3896         return rc;
3897 }
3898 
3899 /*
3900  * Get attributes (cache operations)
3901  * Returnes the cache attributes used in Define Extend (DE).
3902  */
3903 static int
3904 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3905 {
3906         struct dasd_eckd_private *private =
3907                 (struct dasd_eckd_private *)device->private;
3908         struct attrib_data_t attrib = private->attrib;
3909         int rc;
3910 
3911         if (!capable(CAP_SYS_ADMIN))
3912                 return -EACCES;
3913         if (!argp)
3914                 return -EINVAL;
3915 
3916         rc = 0;
3917         if (copy_to_user(argp, (long *) &attrib,
3918                          sizeof(struct attrib_data_t)))
3919                 rc = -EFAULT;
3920 
3921         return rc;
3922 }
3923 
3924 /*
3925  * Set attributes (cache operations)
3926  * Stores the attributes for cache operation to be used in Define Extend (DE).
3927  */
3928 static int
3929 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3930 {
3931         struct dasd_eckd_private *private =
3932                 (struct dasd_eckd_private *)device->private;
3933         struct attrib_data_t attrib;
3934 
3935         if (!capable(CAP_SYS_ADMIN))
3936                 return -EACCES;
3937         if (!argp)
3938                 return -EINVAL;
3939 
3940         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3941                 return -EFAULT;
3942         private->attrib = attrib;
3943 
3944         dev_info(&device->cdev->dev,
3945                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3946                  private->attrib.operation, private->attrib.nr_cyl);
3947         return 0;
3948 }
3949 
3950 /*
3951  * Issue syscall I/O to EMC Symmetrix array.
3952  * CCWs are PSF and RSSD
3953  */
3954 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3955 {
3956         struct dasd_symmio_parms usrparm;
3957         char *psf_data, *rssd_result;
3958         struct dasd_ccw_req *cqr;
3959         struct ccw1 *ccw;
3960         char psf0, psf1;
3961         int rc;
3962 
3963         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3964                 return -EACCES;
3965         psf0 = psf1 = 0;
3966 
3967         /* Copy parms from caller */
3968         rc = -EFAULT;
3969         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3970                 goto out;
3971         if (is_compat_task() || sizeof(long) == 4) {
3972                 /* Make sure pointers are sane even on 31 bit. */
3973                 rc = -EINVAL;
3974                 if ((usrparm.psf_data >> 32) != 0)
3975                         goto out;
3976                 if ((usrparm.rssd_result >> 32) != 0)
3977                         goto out;
3978                 usrparm.psf_data &= 0x7fffffffULL;
3979                 usrparm.rssd_result &= 0x7fffffffULL;
3980         }
3981         /* alloc I/O data area */
3982         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3983         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3984         if (!psf_data || !rssd_result) {
3985                 rc = -ENOMEM;
3986                 goto out_free;
3987         }
3988 
3989         /* get syscall header from user space */
3990         rc = -EFAULT;
3991         if (copy_from_user(psf_data,
3992                            (void __user *)(unsigned long) usrparm.psf_data,
3993                            usrparm.psf_data_len))
3994                 goto out_free;
3995         psf0 = psf_data[0];
3996         psf1 = psf_data[1];
3997 
3998         /* setup CCWs for PSF + RSSD */
3999         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4000         if (IS_ERR(cqr)) {
4001                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4002                         "Could not allocate initialization request");
4003                 rc = PTR_ERR(cqr);
4004                 goto out_free;
4005         }
4006 
4007         cqr->startdev = device;
4008         cqr->memdev = device;
4009         cqr->retries = 3;
4010         cqr->expires = 10 * HZ;
4011         cqr->buildclk = get_tod_clock();
4012         cqr->status = DASD_CQR_FILLED;
4013 
4014         /* Build the ccws */
4015         ccw = cqr->cpaddr;
4016 
4017         /* PSF ccw */
4018         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4019         ccw->count = usrparm.psf_data_len;
4020         ccw->flags |= CCW_FLAG_CC;
4021         ccw->cda = (__u32)(addr_t) psf_data;
4022 
4023         ccw++;
4024 
4025         /* RSSD ccw  */
4026         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4027         ccw->count = usrparm.rssd_result_len;
4028         ccw->flags = CCW_FLAG_SLI ;
4029         ccw->cda = (__u32)(addr_t) rssd_result;
4030 
4031         rc = dasd_sleep_on(cqr);
4032         if (rc)
4033                 goto out_sfree;
4034 
4035         rc = -EFAULT;
4036         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4037                            rssd_result, usrparm.rssd_result_len))
4038                 goto out_sfree;
4039         rc = 0;
4040 
4041 out_sfree:
4042         dasd_sfree_request(cqr, cqr->memdev);
4043 out_free:
4044         kfree(rssd_result);
4045         kfree(psf_data);
4046 out:
4047         DBF_DEV_EVENT(DBF_WARNING, device,
4048                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4049                       (int) psf0, (int) psf1, rc);
4050         return rc;
4051 }
4052 
4053 static int
4054 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4055 {
4056         struct dasd_device *device = block->base;
4057 
4058         switch (cmd) {
4059         case BIODASDGATTR:
4060                 return dasd_eckd_get_attrib(device, argp);
4061         case BIODASDSATTR:
4062                 return dasd_eckd_set_attrib(device, argp);
4063         case BIODASDPSRD:
4064                 return dasd_eckd_performance(device, argp);
4065         case BIODASDRLSE:
4066                 return dasd_eckd_release(device);
4067         case BIODASDRSRV:
4068                 return dasd_eckd_reserve(device);
4069         case BIODASDSLCK:
4070                 return dasd_eckd_steal_lock(device);
4071         case BIODASDSNID:
4072                 return dasd_eckd_snid(device, argp);
4073         case BIODASDSYMMIO:
4074                 return dasd_symm_io(device, argp);
4075         default:
4076                 return -ENOTTY;
4077         }
4078 }
4079 
4080 /*
4081  * Dump the range of CCWs into 'page' buffer
4082  * and return number of printed chars.
4083  */
4084 static int
4085 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4086 {
4087         int len, count;
4088         char *datap;
4089 
4090         len = 0;
4091         while (from <= to) {
4092                 len += sprintf(page + len, PRINTK_HEADER
4093                                " CCW %p: %08X %08X DAT:",
4094                                from, ((int *) from)[0], ((int *) from)[1]);
4095 
4096                 /* get pointer to data (consider IDALs) */
4097                 if (from->flags & CCW_FLAG_IDA)
4098                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4099                 else
4100                         datap = (char *) ((addr_t) from->cda);
4101 
4102                 /* dump data (max 32 bytes) */
4103                 for (count = 0; count < from->count && count < 32; count++) {
4104                         if (count % 8 == 0) len += sprintf(page + len, " ");
4105                         if (count % 4 == 0) len += sprintf(page + len, " ");
4106                         len += sprintf(page + len, "%02x", datap[count]);
4107                 }
4108                 len += sprintf(page + len, "\n");
4109                 from++;
4110         }
4111         return len;
4112 }
4113 
4114 static void
4115 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4116                          char *reason)
4117 {
4118         u64 *sense;
4119         u64 *stat;
4120 
4121         sense = (u64 *) dasd_get_sense(irb);
4122         stat = (u64 *) &irb->scsw;
4123         if (sense) {
4124                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4125                               "%016llx %016llx %016llx %016llx",
4126                               reason, *stat, *((u32 *) (stat + 1)),
4127                               sense[0], sense[1], sense[2], sense[3]);
4128         } else {
4129                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4130                               reason, *stat, *((u32 *) (stat + 1)),
4131                               "NO VALID SENSE");
4132         }
4133 }
4134 
4135 /*
4136  * Print sense data and related channel program.
4137  * Parts are printed because printk buffer is only 1024 bytes.
4138  */
4139 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4140                                  struct dasd_ccw_req *req, struct irb *irb)
4141 {
4142         char *page;
4143         struct ccw1 *first, *last, *fail, *from, *to;
4144         int len, sl, sct;
4145 
4146         page = (char *) get_zeroed_page(GFP_ATOMIC);
4147         if (page == NULL) {
4148                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4149                               "No memory to dump sense data\n");
4150                 return;
4151         }
4152         /* dump the sense data */
4153         len = sprintf(page, PRINTK_HEADER
4154                       " I/O status report for device %s:\n",
4155                       dev_name(&device->cdev->dev));
4156         len += sprintf(page + len, PRINTK_HEADER
4157                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4158                        "CS:%02X RC:%d\n",
4159                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4160                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4161                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4162                        req ? req->intrc : 0);
4163         len += sprintf(page + len, PRINTK_HEADER
4164                        " device %s: Failing CCW: %p\n",
4165                        dev_name(&device->cdev->dev),
4166                        (void *) (addr_t) irb->scsw.cmd.cpa);
4167         if (irb->esw.esw0.erw.cons) {
4168                 for (sl = 0; sl < 4; sl++) {
4169                         len += sprintf(page + len, PRINTK_HEADER
4170                                        " Sense(hex) %2d-%2d:",
4171                                        (8 * sl), ((8 * sl) + 7));
4172 
4173                         for (sct = 0; sct < 8; sct++) {
4174                                 len += sprintf(page + len, " %02x",
4175                                                irb->ecw[8 * sl + sct]);
4176                         }
4177                         len += sprintf(page + len, "\n");
4178                 }
4179 
4180                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4181                         /* 24 Byte Sense Data */
4182                         sprintf(page + len, PRINTK_HEADER
4183                                 " 24 Byte: %x MSG %x, "
4184                                 "%s MSGb to SYSOP\n",
4185                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4186                                 irb->ecw[1] & 0x10 ? "" : "no");
4187                 } else {
4188                         /* 32 Byte Sense Data */
4189                         sprintf(page + len, PRINTK_HEADER
4190                                 " 32 Byte: Format: %x "
4191                                 "Exception class %x\n",
4192                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4193                 }
4194         } else {
4195                 sprintf(page + len, PRINTK_HEADER
4196                         " SORRY - NO VALID SENSE AVAILABLE\n");
4197         }
4198         printk(KERN_ERR "%s", page);
4199 
4200         if (req) {
4201                 /* req == NULL for unsolicited interrupts */
4202                 /* dump the Channel Program (max 140 Bytes per line) */
4203                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4204                 first = req->cpaddr;
4205                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4206                 to = min(first + 6, last);
4207                 len = sprintf(page, PRINTK_HEADER
4208                               " Related CP in req: %p\n", req);
4209                 dasd_eckd_dump_ccw_range(first, to, page + len);
4210                 printk(KERN_ERR "%s", page);
4211 
4212                 /* print failing CCW area (maximum 4) */
4213                 /* scsw->cda is either valid or zero  */
4214                 len = 0;
4215                 from = ++to;
4216                 fail = (struct ccw1 *)(addr_t)
4217                                 irb->scsw.cmd.cpa; /* failing CCW */
4218                 if (from <  fail - 2) {
4219                         from = fail - 2;     /* there is a gap - print header */
4220                         len += sprintf(page, PRINTK_HEADER "......\n");
4221                 }
4222                 to = min(fail + 1, last);
4223                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4224 
4225                 /* print last CCWs (maximum 2) */
4226                 from = max(from, ++to);
4227                 if (from < last - 1) {
4228                         from = last - 1;     /* there is a gap - print header */
4229                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4230                 }
4231                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4232                 if (len > 0)
4233                         printk(KERN_ERR "%s", page);
4234         }
4235         free_page((unsigned long) page);
4236 }
4237 
4238 
4239 /*
4240  * Print sense data from a tcw.
4241  */
4242 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4243                                  struct dasd_ccw_req *req, struct irb *irb)
4244 {
4245         char *page;
4246         int len, sl, sct, residual;
4247         struct tsb *tsb;
4248         u8 *sense, *rcq;
4249 
4250         page = (char *) get_zeroed_page(GFP_ATOMIC);
4251         if (page == NULL) {
4252                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4253                             "No memory to dump sense data");
4254                 return;
4255         }
4256         /* dump the sense data */
4257         len = sprintf(page, PRINTK_HEADER
4258                       " I/O status report for device %s:\n",
4259                       dev_name(&device->cdev->dev));
4260         len += sprintf(page + len, PRINTK_HEADER
4261                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4262                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4263                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4264                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4265                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4266                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4267                        req ? req->intrc : 0);
4268         len += sprintf(page + len, PRINTK_HEADER
4269                        " device %s: Failing TCW: %p\n",
4270                        dev_name(&device->cdev->dev),
4271                        (void *) (addr_t) irb->scsw.tm.tcw);
4272 
4273         tsb = NULL;
4274         sense = NULL;
4275         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4276                 tsb = tcw_get_tsb(
4277                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4278 
4279         if (tsb) {
4280                 len += sprintf(page + len, PRINTK_HEADER
4281                                " tsb->length %d\n", tsb->length);
4282                 len += sprintf(page + len, PRINTK_HEADER
4283                                " tsb->flags %x\n", tsb->flags);
4284                 len += sprintf(page + len, PRINTK_HEADER
4285                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4286                 len += sprintf(page + len, PRINTK_HEADER
4287                                " tsb->count %d\n", tsb->count);
4288                 residual = tsb->count - 28;
4289                 len += sprintf(page + len, PRINTK_HEADER
4290                                " residual %d\n", residual);
4291 
4292                 switch (tsb->flags & 0x07) {
4293                 case 1: /* tsa_iostat */
4294                         len += sprintf(page + len, PRINTK_HEADER
4295                                " tsb->tsa.iostat.dev_time %d\n",
4296                                        tsb->tsa.iostat.dev_time);
4297                         len += sprintf(page + len, PRINTK_HEADER
4298                                " tsb->tsa.iostat.def_time %d\n",
4299                                        tsb->tsa.iostat.def_time);
4300                         len += sprintf(page + len, PRINTK_HEADER
4301                                " tsb->tsa.iostat.queue_time %d\n",
4302                                        tsb->tsa.iostat.queue_time);
4303                         len += sprintf(page + len, PRINTK_HEADER
4304                                " tsb->tsa.iostat.dev_busy_time %d\n",
4305                                        tsb->tsa.iostat.dev_busy_time);
4306                         len += sprintf(page + len, PRINTK_HEADER
4307                                " tsb->tsa.iostat.dev_act_time %d\n",
4308                                        tsb->tsa.iostat.dev_act_time);
4309                         sense = tsb->tsa.iostat.sense;
4310                         break;
4311                 case 2: /* ts_ddpc */
4312                         len += sprintf(page + len, PRINTK_HEADER
4313                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4314                         for (sl = 0; sl < 2; sl++) {
4315                                 len += sprintf(page + len, PRINTK_HEADER
4316                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4317                                                (8 * sl), ((8 * sl) + 7));
4318                                 rcq = tsb->tsa.ddpc.rcq;
4319                                 for (sct = 0; sct < 8; sct++) {
4320                                         len += sprintf(page + len, " %02x",
4321                                                        rcq[8 * sl + sct]);
4322                                 }
4323                                 len += sprintf(page + len, "\n");
4324                         }
4325                         sense = tsb->tsa.ddpc.sense;
4326                         break;
4327                 case 3: /* tsa_intrg */
4328                         len += sprintf(page + len, PRINTK_HEADER
4329                                       " tsb->tsa.intrg.: not supportet yet\n");
4330                         break;
4331                 }
4332 
4333                 if (sense) {
4334                         for (sl = 0; sl < 4; sl++) {
4335                                 len += sprintf(page + len, PRINTK_HEADER
4336                                                " Sense(hex) %2d-%2d:",
4337                                                (8 * sl), ((8 * sl) + 7));
4338                                 for (sct = 0; sct < 8; sct++) {
4339                                         len += sprintf(page + len, " %02x",
4340                                                        sense[8 * sl + sct]);
4341                                 }
4342                                 len += sprintf(page + len, "\n");
4343                         }
4344 
4345                         if (sense[27] & DASD_SENSE_BIT_0) {
4346                                 /* 24 Byte Sense Data */
4347                                 sprintf(page + len, PRINTK_HEADER
4348                                         " 24 Byte: %x MSG %x, "
4349                                         "%s MSGb to SYSOP\n",
4350                                         sense[7] >> 4, sense[7] & 0x0f,
4351                                         sense[1] & 0x10 ? "" : "no");
4352                         } else {
4353                                 /* 32 Byte Sense Data */
4354                                 sprintf(page + len, PRINTK_HEADER
4355                                         " 32 Byte: Format: %x "
4356                                         "Exception class %x\n",
4357                                         sense[6] & 0x0f, sense[22] >> 4);
4358                         }
4359                 } else {
4360                         sprintf(page + len, PRINTK_HEADER
4361                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4362                 }
4363         } else {
4364                 sprintf(page + len, PRINTK_HEADER
4365                         " SORRY - NO TSB DATA AVAILABLE\n");
4366         }
4367         printk(KERN_ERR "%s", page);
4368         free_page((unsigned long) page);
4369 }
4370 
4371 static void dasd_eckd_dump_sense(struct dasd_device *device,
4372                                  struct dasd_ccw_req *req, struct irb *irb)
4373 {
4374         if (scsw_is_tm(&irb->scsw))
4375                 dasd_eckd_dump_sense_tcw(device, req, irb);
4376         else
4377                 dasd_eckd_dump_sense_ccw(device, req, irb);
4378 }
4379 
4380 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4381 {
4382         /*
4383          * the device should be disconnected from our LCU structure
4384          * on restore we will reconnect it and reread LCU specific
4385          * information like PAV support that might have changed
4386          */
4387         dasd_alias_remove_device(device);
4388         dasd_alias_disconnect_device_from_lcu(device);
4389 
4390         return 0;
4391 }
4392 
4393 static int dasd_eckd_restore_device(struct dasd_device *device)
4394 {
4395         struct dasd_eckd_private *private;
4396         struct dasd_eckd_characteristics temp_rdc_data;
4397         int rc;
4398         struct dasd_uid temp_uid;
4399         unsigned long flags;
4400         unsigned long cqr_flags = 0;
4401 
4402         private = (struct dasd_eckd_private *) device->private;
4403 
4404         /* Read Configuration Data */
4405         dasd_eckd_read_conf(device);
4406 
4407         dasd_eckd_get_uid(device, &temp_uid);
4408         /* Generate device unique id */
4409         rc = dasd_eckd_generate_uid(device);
4410         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4411         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4412                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4413                         "changed\n");
4414         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4415         if (rc)
4416                 goto out_err;
4417 
4418         /* register lcu with alias handling, enable PAV if this is a new lcu */
4419         rc = dasd_alias_make_device_known_to_lcu(device);
4420         if (rc)
4421                 return rc;
4422 
4423         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4424         dasd_eckd_validate_server(device, cqr_flags);
4425 
4426         /* RE-Read Configuration Data */
4427         dasd_eckd_read_conf(device);
4428 
4429         /* Read Feature Codes */
4430         dasd_eckd_read_features(device);
4431 
4432         /* Read Device Characteristics */
4433         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4434                                          &temp_rdc_data, 64);
4435         if (rc) {
4436                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4437                                 "Read device characteristic failed, rc=%d", rc);
4438                 goto out_err;
4439         }
4440         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4441         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4442         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4443 
4444         /* add device to alias management */
4445         dasd_alias_add_device(device);
4446 
4447         return 0;
4448 
4449 out_err:
4450         return -1;
4451 }
4452 
4453 static int dasd_eckd_reload_device(struct dasd_device *device)
4454 {
4455         struct dasd_eckd_private *private;
4456         int rc, old_base;
4457         char print_uid[60];
4458         struct dasd_uid uid;
4459         unsigned long flags;
4460 
4461         private = (struct dasd_eckd_private *) device->private;
4462 
4463         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4464         old_base = private->uid.base_unit_addr;
4465         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4466 
4467         /* Read Configuration Data */
4468         rc = dasd_eckd_read_conf(device);
4469         if (rc)
4470                 goto out_err;
4471 
4472         rc = dasd_eckd_generate_uid(device);
4473         if (rc)
4474                 goto out_err;
4475         /*
4476          * update unit address configuration and
4477          * add device to alias management
4478          */
4479         dasd_alias_update_add_device(device);
4480 
4481         dasd_eckd_get_uid(device, &uid);
4482 
4483         if (old_base != uid.base_unit_addr) {
4484                 if (strlen(uid.vduit) > 0)
4485                         snprintf(print_uid, sizeof(print_uid),
4486                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4487                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4488                 else
4489                         snprintf(print_uid, sizeof(print_uid),
4490                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4491                                  uid.ssid, uid.base_unit_addr);
4492 
4493                 dev_info(&device->cdev->dev,
4494                          "An Alias device was reassigned to a new base device "
4495                          "with UID: %s\n", print_uid);
4496         }
4497         return 0;
4498 
4499 out_err:
4500         return -1;
4501 }
4502 
4503 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
4504                                          struct dasd_rssd_messages *messages,
4505                                          __u8 lpum)
4506 {
4507         struct dasd_rssd_messages *message_buf;
4508         struct dasd_psf_prssd_data *prssdp;
4509         struct dasd_eckd_private *private;
4510         struct dasd_ccw_req *cqr;
4511         struct ccw1 *ccw;
4512         int rc;
4513 
4514         private = (struct dasd_eckd_private *) device->private;
4515         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4516                                    (sizeof(struct dasd_psf_prssd_data) +
4517                                     sizeof(struct dasd_rssd_messages)),
4518                                    device);
4519         if (IS_ERR(cqr)) {
4520                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
4521                                 "Could not allocate read message buffer request");
4522                 return PTR_ERR(cqr);
4523         }
4524 
4525         cqr->startdev = device;
4526         cqr->memdev = device;
4527         cqr->block = NULL;
4528         cqr->retries = 256;
4529         cqr->expires = 10 * HZ;
4530 
4531         /* we need to check for messages on exactly this path */
4532         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4533         cqr->lpm = lpum;
4534 
4535         /* Prepare for Read Subsystem Data */
4536         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4537         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4538         prssdp->order = PSF_ORDER_PRSSD;
4539         prssdp->suborder = 0x03;        /* Message Buffer */
4540         /* all other bytes of prssdp must be zero */
4541 
4542         ccw = cqr->cpaddr;
4543         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4544         ccw->count = sizeof(struct dasd_psf_prssd_data);
4545         ccw->flags |= CCW_FLAG_CC;
4546         ccw->flags |= CCW_FLAG_SLI;
4547         ccw->cda = (__u32)(addr_t) prssdp;
4548 
4549         /* Read Subsystem Data - message buffer */
4550         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
4551         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
4552 
4553         ccw++;
4554         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4555         ccw->count = sizeof(struct dasd_rssd_messages);
4556         ccw->flags |= CCW_FLAG_SLI;
4557         ccw->cda = (__u32)(addr_t) message_buf;
4558 
4559         cqr->buildclk = get_tod_clock();
4560         cqr->status = DASD_CQR_FILLED;
4561         rc = dasd_sleep_on_immediatly(cqr);
4562         if (rc == 0) {
4563                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4564                 message_buf = (struct dasd_rssd_messages *)
4565                         (prssdp + 1);
4566                 memcpy(messages, message_buf,
4567                        sizeof(struct dasd_rssd_messages));
4568         } else
4569                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4570                                 "Reading messages failed with rc=%d\n"
4571                                 , rc);
4572         dasd_sfree_request(cqr, cqr->memdev);
4573         return rc;
4574 }
4575 
4576 /*
4577  * Perform Subsystem Function - CUIR response
4578  */
4579 static int
4580 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
4581                             __u32 message_id,
4582                             struct channel_path_desc *desc,
4583                             struct subchannel_id sch_id)
4584 {
4585         struct dasd_psf_cuir_response *psf_cuir;
4586         struct dasd_ccw_req *cqr;
4587         struct ccw1 *ccw;
4588         int rc;
4589 
4590         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
4591                                   sizeof(struct dasd_psf_cuir_response),
4592                                   device);
4593 
4594         if (IS_ERR(cqr)) {
4595                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4596                            "Could not allocate PSF-CUIR request");
4597                 return PTR_ERR(cqr);
4598         }
4599 
4600         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
4601         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
4602         psf_cuir->cc = response;
4603         if (desc)
4604                 psf_cuir->chpid = desc->chpid;
4605         psf_cuir->message_id = message_id;
4606         psf_cuir->cssid = sch_id.cssid;
4607         psf_cuir->ssid = sch_id.ssid;
4608 
4609         ccw = cqr->cpaddr;
4610         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4611         ccw->cda = (__u32)(addr_t)psf_cuir;
4612         ccw->count = sizeof(struct dasd_psf_cuir_response);
4613 
4614         cqr->startdev = device;
4615         cqr->memdev = device;
4616         cqr->block = NULL;
4617         cqr->retries = 256;
4618         cqr->expires = 10*HZ;
4619         cqr->buildclk = get_tod_clock();
4620         cqr->status = DASD_CQR_FILLED;
4621 
4622         rc = dasd_sleep_on(cqr);
4623 
4624         dasd_sfree_request(cqr, cqr->memdev);
4625         return rc;
4626 }
4627 
4628 static int dasd_eckd_cuir_change_state(struct dasd_device *device, __u8 lpum)
4629 {
4630         unsigned long flags;
4631         __u8 tbcpm;
4632 
4633         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4634         tbcpm = device->path_data.opm & ~lpum;
4635         if (tbcpm) {
4636                 device->path_data.opm = tbcpm;
4637                 device->path_data.cuirpm |= lpum;
4638         }
4639         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4640         return tbcpm ? 0 : PSF_CUIR_LAST_PATH;
4641 }
4642 
4643 /*
4644  * walk through all devices and quiesce them
4645  * if it is the last path return error
4646  *
4647  * if only part of the devices are quiesced and an error
4648  * occurs no onlining necessary, the storage server will
4649  * notify the already set offline devices again
4650  */
4651 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
4652                                  struct channel_path_desc *desc,
4653                                  struct subchannel_id sch_id)
4654 {
4655         struct alias_pav_group *pavgroup, *tempgroup;
4656         struct dasd_eckd_private *private;
4657         struct dasd_device *dev, *n;
4658         int rc;
4659 
4660         private = (struct dasd_eckd_private *) device->private;
4661         rc = 0;
4662 
4663         /* active devices */
4664         list_for_each_entry_safe(dev, n,
4665                                  &private->lcu->active_devices,
4666                                  alias_list) {
4667                 rc = dasd_eckd_cuir_change_state(dev, lpum);
4668                 if (rc)
4669                         goto out;
4670         }
4671 
4672         /* inactive devices */
4673         list_for_each_entry_safe(dev, n,
4674                                  &private->lcu->inactive_devices,
4675                                  alias_list) {
4676                 rc = dasd_eckd_cuir_change_state(dev, lpum);
4677                 if (rc)
4678                         goto out;
4679         }
4680 
4681         /* devices in PAV groups */
4682         list_for_each_entry_safe(pavgroup, tempgroup,
4683                                  &private->lcu->grouplist, group) {
4684                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
4685                                          alias_list) {
4686                         rc = dasd_eckd_cuir_change_state(dev, lpum);
4687                         if (rc)
4688                                 goto out;
4689                 }
4690                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
4691                                          alias_list) {
4692                         rc = dasd_eckd_cuir_change_state(dev, lpum);
4693                         if (rc)
4694                                 goto out;
4695                 }
4696         }
4697 
4698         pr_warn("Service on the storage server caused path %x.%02x to go offline",
4699                 sch_id.cssid, desc ? desc->chpid : 0);
4700         rc = PSF_CUIR_COMPLETED;
4701 out:
4702         return rc;
4703 }
4704 
4705 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
4706                                  struct channel_path_desc *desc,
4707                                  struct subchannel_id sch_id)
4708 {
4709         struct alias_pav_group *pavgroup, *tempgroup;
4710         struct dasd_eckd_private *private;
4711         struct dasd_device *dev, *n;
4712 
4713         pr_info("Path %x.%02x is back online after service on the storage server",
4714                 sch_id.cssid, desc ? desc->chpid : 0);
4715         private = (struct dasd_eckd_private *) device->private;
4716 
4717         /*
4718          * the path may have been added through a generic path event before
4719          * only trigger path verification if the path is not already in use
4720          */
4721 
4722         list_for_each_entry_safe(dev, n,
4723                                  &private->lcu->active_devices,
4724                                  alias_list) {
4725                 if (!(dev->path_data.opm & lpum)) {
4726                         dev->path_data.tbvpm |= lpum;
4727                         dasd_schedule_device_bh(dev);
4728                 }
4729         }
4730 
4731         list_for_each_entry_safe(dev, n,
4732                                  &private->lcu->inactive_devices,
4733                                  alias_list) {
4734                 if (!(dev->path_data.opm & lpum)) {
4735                         dev->path_data.tbvpm |= lpum;
4736                         dasd_schedule_device_bh(dev);
4737                 }
4738         }
4739 
4740         /* devices in PAV groups */
4741         list_for_each_entry_safe(pavgroup, tempgroup,
4742                                  &private->lcu->grouplist,
4743                                  group) {
4744                 list_for_each_entry_safe(dev, n,
4745                                          &pavgroup->baselist,
4746                                          alias_list) {
4747                         if (!(dev->path_data.opm & lpum)) {
4748                                 dev->path_data.tbvpm |= lpum;
4749                                 dasd_schedule_device_bh(dev);
4750                         }
4751                 }
4752                 list_for_each_entry_safe(dev, n,
4753                                          &pavgroup->aliaslist,
4754                                          alias_list) {
4755                         if (!(dev->path_data.opm & lpum)) {
4756                                 dev->path_data.tbvpm |= lpum;
4757                                 dasd_schedule_device_bh(dev);
4758                         }
4759                 }
4760         }
4761         return PSF_CUIR_COMPLETED;
4762 }
4763 
4764 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
4765                                  __u8 lpum)
4766 {
4767         struct dasd_cuir_message *cuir = messages;
4768         struct channel_path_desc *desc;
4769         struct subchannel_id sch_id;
4770         int pos, response;
4771         ccw_device_get_schid(device->cdev, &sch_id);
4772 
4773         /* get position of path in mask */
4774         pos = 8 - ffs(lpum);
4775         /* get channel path descriptor from this position */
4776         desc = ccw_device_get_chp_desc(device->cdev, pos);
4777 
4778         if (cuir->code == CUIR_QUIESCE) {
4779                 /* quiesce */
4780                 response = dasd_eckd_cuir_quiesce(device, lpum, desc, sch_id);
4781         } else if (cuir->code == CUIR_RESUME) {
4782                 /* resume */
4783                 response = dasd_eckd_cuir_resume(device, lpum, desc, sch_id);
4784         } else
4785                 response = PSF_CUIR_NOT_SUPPORTED;
4786 
4787         dasd_eckd_psf_cuir_response(device, response, cuir->message_id,
4788                                     desc, sch_id);
4789 
4790         /* free descriptor copy */
4791         kfree(desc);
4792 }
4793 
4794 static void dasd_eckd_check_attention_work(struct work_struct *work)
4795 {
4796         struct check_attention_work_data *data;
4797         struct dasd_rssd_messages *messages;
4798         struct dasd_device *device;
4799         int rc;
4800 
4801         data = container_of(work, struct check_attention_work_data, worker);
4802         device = data->device;
4803 
4804         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
4805         if (!messages) {
4806                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4807                               "Could not allocate attention message buffer");
4808                 goto out;
4809         }
4810 
4811         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
4812         if (rc)
4813                 goto out;
4814 
4815         if (messages->length == ATTENTION_LENGTH_CUIR &&
4816             messages->format == ATTENTION_FORMAT_CUIR)
4817                 dasd_eckd_handle_cuir(device, messages, data->lpum);
4818 
4819 out:
4820         dasd_put_device(device);
4821         kfree(messages);
4822         kfree(data);
4823 }
4824 
4825 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
4826 {
4827         struct check_attention_work_data *data;
4828 
4829         data = kzalloc(sizeof(*data), GFP_ATOMIC);
4830         if (!data)
4831                 return -ENOMEM;
4832         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
4833         dasd_get_device(device);
4834         data->device = device;
4835         data->lpum = lpum;
4836         schedule_work(&data->worker);
4837         return 0;
4838 }
4839 
4840 static struct ccw_driver dasd_eckd_driver = {
4841         .driver = {
4842                 .name   = "dasd-eckd",
4843                 .owner  = THIS_MODULE,
4844         },
4845         .ids         = dasd_eckd_ids,
4846         .probe       = dasd_eckd_probe,
4847         .remove      = dasd_generic_remove,
4848         .set_offline = dasd_generic_set_offline,
4849         .set_online  = dasd_eckd_set_online,
4850         .notify      = dasd_generic_notify,
4851         .path_event  = dasd_generic_path_event,
4852         .shutdown    = dasd_generic_shutdown,
4853         .freeze      = dasd_generic_pm_freeze,
4854         .thaw        = dasd_generic_restore_device,
4855         .restore     = dasd_generic_restore_device,
4856         .uc_handler  = dasd_generic_uc_handler,
4857         .int_class   = IRQIO_DAS,
4858 };
4859 
4860 /*
4861  * max_blocks is dependent on the amount of storage that is available
4862  * in the static io buffer for each device. Currently each device has
4863  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4864  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4865  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4866  * addition we have one define extent ccw + 16 bytes of data and one
4867  * locate record ccw + 16 bytes of data. That makes:
4868  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4869  * We want to fit two into the available memory so that we can immediately
4870  * start the next request if one finishes off. That makes 249.5 blocks
4871  * for one request. Give a little safety and the result is 240.
4872  */
4873 static struct dasd_discipline dasd_eckd_discipline = {
4874         .owner = THIS_MODULE,
4875         .name = "ECKD",
4876         .ebcname = "ECKD",
4877         .max_blocks = 190,
4878         .check_device = dasd_eckd_check_characteristics,
4879         .uncheck_device = dasd_eckd_uncheck_device,
4880         .do_analysis = dasd_eckd_do_analysis,
4881         .verify_path = dasd_eckd_verify_path,
4882         .basic_to_ready = dasd_eckd_basic_to_ready,
4883         .online_to_ready = dasd_eckd_online_to_ready,
4884         .basic_to_known = dasd_eckd_basic_to_known,
4885         .fill_geometry = dasd_eckd_fill_geometry,
4886         .start_IO = dasd_start_IO,
4887         .term_IO = dasd_term_IO,
4888         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4889         .format_device = dasd_eckd_format_device,
4890         .erp_action = dasd_eckd_erp_action,
4891         .erp_postaction = dasd_eckd_erp_postaction,
4892         .check_for_device_change = dasd_eckd_check_for_device_change,
4893         .build_cp = dasd_eckd_build_alias_cp,
4894         .free_cp = dasd_eckd_free_alias_cp,
4895         .dump_sense = dasd_eckd_dump_sense,
4896         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4897         .fill_info = dasd_eckd_fill_info,
4898         .ioctl = dasd_eckd_ioctl,
4899         .freeze = dasd_eckd_pm_freeze,
4900         .restore = dasd_eckd_restore_device,
4901         .reload = dasd_eckd_reload_device,
4902         .get_uid = dasd_eckd_get_uid,
4903         .kick_validate = dasd_eckd_kick_validate_server,
4904         .check_attention = dasd_eckd_check_attention,
4905 };
4906 
4907 static int __init
4908 dasd_eckd_init(void)
4909 {
4910         int ret;
4911 
4912         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4913         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4914                                    GFP_KERNEL | GFP_DMA);
4915         if (!dasd_reserve_req)
4916                 return -ENOMEM;
4917         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4918                                    GFP_KERNEL | GFP_DMA);
4919         if (!path_verification_worker) {
4920                 kfree(dasd_reserve_req);
4921                 return -ENOMEM;
4922         }
4923         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
4924         if (!rawpadpage) {
4925                 kfree(path_verification_worker);
4926                 kfree(dasd_reserve_req);
4927                 return -ENOMEM;
4928         }
4929         ret = ccw_driver_register(&dasd_eckd_driver);
4930         if (!ret)
4931                 wait_for_device_probe();
4932         else {
4933                 kfree(path_verification_worker);
4934                 kfree(dasd_reserve_req);
4935                 free_page((unsigned long)rawpadpage);
4936         }
4937         return ret;
4938 }
4939 
4940 static void __exit
4941 dasd_eckd_cleanup(void)
4942 {
4943         ccw_driver_unregister(&dasd_eckd_driver);
4944         kfree(path_verification_worker);
4945         kfree(dasd_reserve_req);
4946         free_page((unsigned long)rawpadpage);
4947 }
4948 
4949 module_init(dasd_eckd_init);
4950 module_exit(dasd_eckd_cleanup);
4951 

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