Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 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

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         schedule_work(&device->kick_validate);
1632 }
1633 
1634 static u32 get_fcx_max_data(struct dasd_device *device)
1635 {
1636 #if defined(CONFIG_64BIT)
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 #else
1661         return 0;
1662 #endif
1663 }
1664 
1665 /*
1666  * Check device characteristics.
1667  * If the device is accessible using ECKD discipline, the device is enabled.
1668  */
1669 static int
1670 dasd_eckd_check_characteristics(struct dasd_device *device)
1671 {
1672         struct dasd_eckd_private *private;
1673         struct dasd_block *block;
1674         struct dasd_uid temp_uid;
1675         int rc, i;
1676         int readonly;
1677         unsigned long value;
1678 
1679         /* setup work queue for validate server*/
1680         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1681 
1682         if (!ccw_device_is_pathgroup(device->cdev)) {
1683                 dev_warn(&device->cdev->dev,
1684                          "A channel path group could not be established\n");
1685                 return -EIO;
1686         }
1687         if (!ccw_device_is_multipath(device->cdev)) {
1688                 dev_info(&device->cdev->dev,
1689                          "The DASD is not operating in multipath mode\n");
1690         }
1691         private = (struct dasd_eckd_private *) device->private;
1692         if (!private) {
1693                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1694                 if (!private) {
1695                         dev_warn(&device->cdev->dev,
1696                                  "Allocating memory for private DASD data "
1697                                  "failed\n");
1698                         return -ENOMEM;
1699                 }
1700                 device->private = (void *) private;
1701         } else {
1702                 memset(private, 0, sizeof(*private));
1703         }
1704         /* Invalidate status of initial analysis. */
1705         private->init_cqr_status = -1;
1706         /* Set default cache operations. */
1707         private->attrib.operation = DASD_NORMAL_CACHE;
1708         private->attrib.nr_cyl = 0;
1709 
1710         /* Read Configuration Data */
1711         rc = dasd_eckd_read_conf(device);
1712         if (rc)
1713                 goto out_err1;
1714 
1715         /* set default timeout */
1716         device->default_expires = DASD_EXPIRES;
1717         /* set default retry count */
1718         device->default_retries = DASD_RETRIES;
1719 
1720         if (private->gneq) {
1721                 value = 1;
1722                 for (i = 0; i < private->gneq->timeout.value; i++)
1723                         value = 10 * value;
1724                 value = value * private->gneq->timeout.number;
1725                 /* do not accept useless values */
1726                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1727                         device->default_expires = value;
1728         }
1729 
1730         dasd_eckd_get_uid(device, &temp_uid);
1731         if (temp_uid.type == UA_BASE_DEVICE) {
1732                 block = dasd_alloc_block();
1733                 if (IS_ERR(block)) {
1734                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1735                                         "could not allocate dasd "
1736                                         "block structure");
1737                         rc = PTR_ERR(block);
1738                         goto out_err1;
1739                 }
1740                 device->block = block;
1741                 block->base = device;
1742         }
1743 
1744         /* register lcu with alias handling, enable PAV */
1745         rc = dasd_alias_make_device_known_to_lcu(device);
1746         if (rc)
1747                 goto out_err2;
1748 
1749         dasd_eckd_validate_server(device, 0);
1750 
1751         /* device may report different configuration data after LCU setup */
1752         rc = dasd_eckd_read_conf(device);
1753         if (rc)
1754                 goto out_err3;
1755 
1756         /* Read Feature Codes */
1757         dasd_eckd_read_features(device);
1758 
1759         /* Read Device Characteristics */
1760         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1761                                          &private->rdc_data, 64);
1762         if (rc) {
1763                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1764                                 "Read device characteristic failed, rc=%d", rc);
1765                 goto out_err3;
1766         }
1767 
1768         if ((device->features & DASD_FEATURE_USERAW) &&
1769             !(private->rdc_data.facilities.RT_in_LR)) {
1770                 dev_err(&device->cdev->dev, "The storage server does not "
1771                         "support raw-track access\n");
1772                 rc = -EINVAL;
1773                 goto out_err3;
1774         }
1775 
1776         /* find the valid cylinder size */
1777         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1778             private->rdc_data.long_no_cyl)
1779                 private->real_cyl = private->rdc_data.long_no_cyl;
1780         else
1781                 private->real_cyl = private->rdc_data.no_cyl;
1782 
1783         private->fcx_max_data = get_fcx_max_data(device);
1784 
1785         readonly = dasd_device_is_ro(device);
1786         if (readonly)
1787                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1788 
1789         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1790                  "with %d cylinders, %d heads, %d sectors%s\n",
1791                  private->rdc_data.dev_type,
1792                  private->rdc_data.dev_model,
1793                  private->rdc_data.cu_type,
1794                  private->rdc_data.cu_model.model,
1795                  private->real_cyl,
1796                  private->rdc_data.trk_per_cyl,
1797                  private->rdc_data.sec_per_trk,
1798                  readonly ? ", read-only device" : "");
1799         return 0;
1800 
1801 out_err3:
1802         dasd_alias_disconnect_device_from_lcu(device);
1803 out_err2:
1804         dasd_free_block(device->block);
1805         device->block = NULL;
1806 out_err1:
1807         kfree(private->conf_data);
1808         kfree(device->private);
1809         device->private = NULL;
1810         return rc;
1811 }
1812 
1813 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1814 {
1815         struct dasd_eckd_private *private;
1816 
1817         private = (struct dasd_eckd_private *) device->private;
1818         dasd_alias_disconnect_device_from_lcu(device);
1819         private->ned = NULL;
1820         private->sneq = NULL;
1821         private->vdsneq = NULL;
1822         private->gneq = NULL;
1823         private->conf_len = 0;
1824         kfree(private->conf_data);
1825         private->conf_data = NULL;
1826 }
1827 
1828 static struct dasd_ccw_req *
1829 dasd_eckd_analysis_ccw(struct dasd_device *device)
1830 {
1831         struct dasd_eckd_private *private;
1832         struct eckd_count *count_data;
1833         struct LO_eckd_data *LO_data;
1834         struct dasd_ccw_req *cqr;
1835         struct ccw1 *ccw;
1836         int cplength, datasize;
1837         int i;
1838 
1839         private = (struct dasd_eckd_private *) device->private;
1840 
1841         cplength = 8;
1842         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1843         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1844         if (IS_ERR(cqr))
1845                 return cqr;
1846         ccw = cqr->cpaddr;
1847         /* Define extent for the first 3 tracks. */
1848         define_extent(ccw++, cqr->data, 0, 2,
1849                       DASD_ECKD_CCW_READ_COUNT, device);
1850         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1851         /* Locate record for the first 4 records on track 0. */
1852         ccw[-1].flags |= CCW_FLAG_CC;
1853         locate_record(ccw++, LO_data++, 0, 0, 4,
1854                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1855 
1856         count_data = private->count_area;
1857         for (i = 0; i < 4; i++) {
1858                 ccw[-1].flags |= CCW_FLAG_CC;
1859                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1860                 ccw->flags = 0;
1861                 ccw->count = 8;
1862                 ccw->cda = (__u32)(addr_t) count_data;
1863                 ccw++;
1864                 count_data++;
1865         }
1866 
1867         /* Locate record for the first record on track 2. */
1868         ccw[-1].flags |= CCW_FLAG_CC;
1869         locate_record(ccw++, LO_data++, 2, 0, 1,
1870                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1871         /* Read count ccw. */
1872         ccw[-1].flags |= CCW_FLAG_CC;
1873         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1874         ccw->flags = 0;
1875         ccw->count = 8;
1876         ccw->cda = (__u32)(addr_t) count_data;
1877 
1878         cqr->block = NULL;
1879         cqr->startdev = device;
1880         cqr->memdev = device;
1881         cqr->retries = 255;
1882         cqr->buildclk = get_tod_clock();
1883         cqr->status = DASD_CQR_FILLED;
1884         return cqr;
1885 }
1886 
1887 /* differentiate between 'no record found' and any other error */
1888 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1889 {
1890         char *sense;
1891         if (init_cqr->status == DASD_CQR_DONE)
1892                 return INIT_CQR_OK;
1893         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1894                  init_cqr->status == DASD_CQR_FAILED) {
1895                 sense = dasd_get_sense(&init_cqr->irb);
1896                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1897                         return INIT_CQR_UNFORMATTED;
1898                 else
1899                         return INIT_CQR_ERROR;
1900         } else
1901                 return INIT_CQR_ERROR;
1902 }
1903 
1904 /*
1905  * This is the callback function for the init_analysis cqr. It saves
1906  * the status of the initial analysis ccw before it frees it and kicks
1907  * the device to continue the startup sequence. This will call
1908  * dasd_eckd_do_analysis again (if the devices has not been marked
1909  * for deletion in the meantime).
1910  */
1911 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1912                                         void *data)
1913 {
1914         struct dasd_eckd_private *private;
1915         struct dasd_device *device;
1916 
1917         device = init_cqr->startdev;
1918         private = (struct dasd_eckd_private *) device->private;
1919         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1920         dasd_sfree_request(init_cqr, device);
1921         dasd_kick_device(device);
1922 }
1923 
1924 static int dasd_eckd_start_analysis(struct dasd_block *block)
1925 {
1926         struct dasd_ccw_req *init_cqr;
1927 
1928         init_cqr = dasd_eckd_analysis_ccw(block->base);
1929         if (IS_ERR(init_cqr))
1930                 return PTR_ERR(init_cqr);
1931         init_cqr->callback = dasd_eckd_analysis_callback;
1932         init_cqr->callback_data = NULL;
1933         init_cqr->expires = 5*HZ;
1934         /* first try without ERP, so we can later handle unformatted
1935          * devices as special case
1936          */
1937         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1938         init_cqr->retries = 0;
1939         dasd_add_request_head(init_cqr);
1940         return -EAGAIN;
1941 }
1942 
1943 static int dasd_eckd_end_analysis(struct dasd_block *block)
1944 {
1945         struct dasd_device *device;
1946         struct dasd_eckd_private *private;
1947         struct eckd_count *count_area;
1948         unsigned int sb, blk_per_trk;
1949         int status, i;
1950         struct dasd_ccw_req *init_cqr;
1951 
1952         device = block->base;
1953         private = (struct dasd_eckd_private *) device->private;
1954         status = private->init_cqr_status;
1955         private->init_cqr_status = -1;
1956         if (status == INIT_CQR_ERROR) {
1957                 /* try again, this time with full ERP */
1958                 init_cqr = dasd_eckd_analysis_ccw(device);
1959                 dasd_sleep_on(init_cqr);
1960                 status = dasd_eckd_analysis_evaluation(init_cqr);
1961                 dasd_sfree_request(init_cqr, device);
1962         }
1963 
1964         if (device->features & DASD_FEATURE_USERAW) {
1965                 block->bp_block = DASD_RAW_BLOCKSIZE;
1966                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1967                 block->s2b_shift = 3;
1968                 goto raw;
1969         }
1970 
1971         if (status == INIT_CQR_UNFORMATTED) {
1972                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1973                 return -EMEDIUMTYPE;
1974         } else if (status == INIT_CQR_ERROR) {
1975                 dev_err(&device->cdev->dev,
1976                         "Detecting the DASD disk layout failed because "
1977                         "of an I/O error\n");
1978                 return -EIO;
1979         }
1980 
1981         private->uses_cdl = 1;
1982         /* Check Track 0 for Compatible Disk Layout */
1983         count_area = NULL;
1984         for (i = 0; i < 3; i++) {
1985                 if (private->count_area[i].kl != 4 ||
1986                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1987                     private->count_area[i].cyl != 0 ||
1988                     private->count_area[i].head != count_area_head[i] ||
1989                     private->count_area[i].record != count_area_rec[i]) {
1990                         private->uses_cdl = 0;
1991                         break;
1992                 }
1993         }
1994         if (i == 3)
1995                 count_area = &private->count_area[4];
1996 
1997         if (private->uses_cdl == 0) {
1998                 for (i = 0; i < 5; i++) {
1999                         if ((private->count_area[i].kl != 0) ||
2000                             (private->count_area[i].dl !=
2001                              private->count_area[0].dl) ||
2002                             private->count_area[i].cyl !=  0 ||
2003                             private->count_area[i].head != count_area_head[i] ||
2004                             private->count_area[i].record != count_area_rec[i])
2005                                 break;
2006                 }
2007                 if (i == 5)
2008                         count_area = &private->count_area[0];
2009         } else {
2010                 if (private->count_area[3].record == 1)
2011                         dev_warn(&device->cdev->dev,
2012                                  "Track 0 has no records following the VTOC\n");
2013         }
2014 
2015         if (count_area != NULL && count_area->kl == 0) {
2016                 /* we found notthing violating our disk layout */
2017                 if (dasd_check_blocksize(count_area->dl) == 0)
2018                         block->bp_block = count_area->dl;
2019         }
2020         if (block->bp_block == 0) {
2021                 dev_warn(&device->cdev->dev,
2022                          "The disk layout of the DASD is not supported\n");
2023                 return -EMEDIUMTYPE;
2024         }
2025         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2026         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2027                 block->s2b_shift++;
2028 
2029         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2030 
2031 raw:
2032         block->blocks = (private->real_cyl *
2033                           private->rdc_data.trk_per_cyl *
2034                           blk_per_trk);
2035 
2036         dev_info(&device->cdev->dev,
2037                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2038                  "%s\n", (block->bp_block >> 10),
2039                  ((private->real_cyl *
2040                    private->rdc_data.trk_per_cyl *
2041                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2042                  ((blk_per_trk * block->bp_block) >> 10),
2043                  private->uses_cdl ?
2044                  "compatible disk layout" : "linux disk layout");
2045 
2046         return 0;
2047 }
2048 
2049 static int dasd_eckd_do_analysis(struct dasd_block *block)
2050 {
2051         struct dasd_eckd_private *private;
2052 
2053         private = (struct dasd_eckd_private *) block->base->private;
2054         if (private->init_cqr_status < 0)
2055                 return dasd_eckd_start_analysis(block);
2056         else
2057                 return dasd_eckd_end_analysis(block);
2058 }
2059 
2060 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2061 {
2062         return dasd_alias_add_device(device);
2063 };
2064 
2065 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2066 {
2067         cancel_work_sync(&device->reload_device);
2068         cancel_work_sync(&device->kick_validate);
2069         return 0;
2070 };
2071 
2072 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2073 {
2074         return dasd_alias_remove_device(device);
2075 };
2076 
2077 static int
2078 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2079 {
2080         struct dasd_eckd_private *private;
2081 
2082         private = (struct dasd_eckd_private *) block->base->private;
2083         if (dasd_check_blocksize(block->bp_block) == 0) {
2084                 geo->sectors = recs_per_track(&private->rdc_data,
2085                                               0, block->bp_block);
2086         }
2087         geo->cylinders = private->rdc_data.no_cyl;
2088         geo->heads = private->rdc_data.trk_per_cyl;
2089         return 0;
2090 }
2091 
2092 static struct dasd_ccw_req *
2093 dasd_eckd_build_format(struct dasd_device *base,
2094                        struct format_data_t *fdata,
2095                        int enable_pav)
2096 {
2097         struct dasd_eckd_private *base_priv;
2098         struct dasd_eckd_private *start_priv;
2099         struct dasd_device *startdev = NULL;
2100         struct dasd_ccw_req *fcp;
2101         struct eckd_count *ect;
2102         struct ch_t address;
2103         struct ccw1 *ccw;
2104         void *data;
2105         int rpt;
2106         int cplength, datasize;
2107         int i, j;
2108         int intensity = 0;
2109         int r0_perm;
2110         int nr_tracks;
2111         int use_prefix;
2112 
2113         if (enable_pav)
2114                 startdev = dasd_alias_get_start_dev(base);
2115 
2116         if (!startdev)
2117                 startdev = base;
2118 
2119         start_priv = (struct dasd_eckd_private *) startdev->private;
2120         base_priv = (struct dasd_eckd_private *) base->private;
2121 
2122         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2123 
2124         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2125 
2126         /*
2127          * fdata->intensity is a bit string that tells us what to do:
2128          *   Bit 0: write record zero
2129          *   Bit 1: write home address, currently not supported
2130          *   Bit 2: invalidate tracks
2131          *   Bit 3: use OS/390 compatible disk layout (cdl)
2132          *   Bit 4: do not allow storage subsystem to modify record zero
2133          * Only some bit combinations do make sense.
2134          */
2135         if (fdata->intensity & 0x10) {
2136                 r0_perm = 0;
2137                 intensity = fdata->intensity & ~0x10;
2138         } else {
2139                 r0_perm = 1;
2140                 intensity = fdata->intensity;
2141         }
2142 
2143         use_prefix = base_priv->features.feature[8] & 0x01;
2144 
2145         switch (intensity) {
2146         case 0x00:      /* Normal format */
2147         case 0x08:      /* Normal format, use cdl. */
2148                 cplength = 2 + (rpt*nr_tracks);
2149                 if (use_prefix)
2150                         datasize = sizeof(struct PFX_eckd_data) +
2151                                 sizeof(struct LO_eckd_data) +
2152                                 rpt * nr_tracks * sizeof(struct eckd_count);
2153                 else
2154                         datasize = sizeof(struct DE_eckd_data) +
2155                                 sizeof(struct LO_eckd_data) +
2156                                 rpt * nr_tracks * sizeof(struct eckd_count);
2157                 break;
2158         case 0x01:      /* Write record zero and format track. */
2159         case 0x09:      /* Write record zero and format track, use cdl. */
2160                 cplength = 2 + rpt * nr_tracks;
2161                 if (use_prefix)
2162                         datasize = sizeof(struct PFX_eckd_data) +
2163                                 sizeof(struct LO_eckd_data) +
2164                                 sizeof(struct eckd_count) +
2165                                 rpt * nr_tracks * sizeof(struct eckd_count);
2166                 else
2167                         datasize = sizeof(struct DE_eckd_data) +
2168                                 sizeof(struct LO_eckd_data) +
2169                                 sizeof(struct eckd_count) +
2170                                 rpt * nr_tracks * sizeof(struct eckd_count);
2171                 break;
2172         case 0x04:      /* Invalidate track. */
2173         case 0x0c:      /* Invalidate track, use cdl. */
2174                 cplength = 3;
2175                 if (use_prefix)
2176                         datasize = sizeof(struct PFX_eckd_data) +
2177                                 sizeof(struct LO_eckd_data) +
2178                                 sizeof(struct eckd_count);
2179                 else
2180                         datasize = sizeof(struct DE_eckd_data) +
2181                                 sizeof(struct LO_eckd_data) +
2182                                 sizeof(struct eckd_count);
2183                 break;
2184         default:
2185                 dev_warn(&startdev->cdev->dev,
2186                          "An I/O control call used incorrect flags 0x%x\n",
2187                          fdata->intensity);
2188                 return ERR_PTR(-EINVAL);
2189         }
2190         /* Allocate the format ccw request. */
2191         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2192                                    datasize, startdev);
2193         if (IS_ERR(fcp))
2194                 return fcp;
2195 
2196         start_priv->count++;
2197         data = fcp->data;
2198         ccw = fcp->cpaddr;
2199 
2200         switch (intensity & ~0x08) {
2201         case 0x00: /* Normal format. */
2202                 if (use_prefix) {
2203                         prefix(ccw++, (struct PFX_eckd_data *) data,
2204                                fdata->start_unit, fdata->stop_unit,
2205                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2206                         /* grant subsystem permission to format R0 */
2207                         if (r0_perm)
2208                                 ((struct PFX_eckd_data *)data)
2209                                         ->define_extent.ga_extended |= 0x04;
2210                         data += sizeof(struct PFX_eckd_data);
2211                 } else {
2212                         define_extent(ccw++, (struct DE_eckd_data *) data,
2213                                       fdata->start_unit, fdata->stop_unit,
2214                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2215                         /* grant subsystem permission to format R0 */
2216                         if (r0_perm)
2217                                 ((struct DE_eckd_data *) data)
2218                                         ->ga_extended |= 0x04;
2219                         data += sizeof(struct DE_eckd_data);
2220                 }
2221                 ccw[-1].flags |= CCW_FLAG_CC;
2222                 locate_record(ccw++, (struct LO_eckd_data *) data,
2223                               fdata->start_unit, 0, rpt*nr_tracks,
2224                               DASD_ECKD_CCW_WRITE_CKD, base,
2225                               fdata->blksize);
2226                 data += sizeof(struct LO_eckd_data);
2227                 break;
2228         case 0x01: /* Write record zero + format track. */
2229                 if (use_prefix) {
2230                         prefix(ccw++, (struct PFX_eckd_data *) data,
2231                                fdata->start_unit, fdata->stop_unit,
2232                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2233                                base, startdev);
2234                         data += sizeof(struct PFX_eckd_data);
2235                 } else {
2236                         define_extent(ccw++, (struct DE_eckd_data *) data,
2237                                fdata->start_unit, fdata->stop_unit,
2238                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2239                         data += sizeof(struct DE_eckd_data);
2240                 }
2241                 ccw[-1].flags |= CCW_FLAG_CC;
2242                 locate_record(ccw++, (struct LO_eckd_data *) data,
2243                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2244                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2245                               base->block->bp_block);
2246                 data += sizeof(struct LO_eckd_data);
2247                 break;
2248         case 0x04: /* Invalidate track. */
2249                 if (use_prefix) {
2250                         prefix(ccw++, (struct PFX_eckd_data *) data,
2251                                fdata->start_unit, fdata->stop_unit,
2252                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2253                         data += sizeof(struct PFX_eckd_data);
2254                 } else {
2255                         define_extent(ccw++, (struct DE_eckd_data *) data,
2256                                fdata->start_unit, fdata->stop_unit,
2257                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2258                         data += sizeof(struct DE_eckd_data);
2259                 }
2260                 ccw[-1].flags |= CCW_FLAG_CC;
2261                 locate_record(ccw++, (struct LO_eckd_data *) data,
2262                               fdata->start_unit, 0, 1,
2263                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2264                 data += sizeof(struct LO_eckd_data);
2265                 break;
2266         }
2267 
2268         for (j = 0; j < nr_tracks; j++) {
2269                 /* calculate cylinder and head for the current track */
2270                 set_ch_t(&address,
2271                          (fdata->start_unit + j) /
2272                          base_priv->rdc_data.trk_per_cyl,
2273                          (fdata->start_unit + j) %
2274                          base_priv->rdc_data.trk_per_cyl);
2275                 if (intensity & 0x01) { /* write record zero */
2276                         ect = (struct eckd_count *) data;
2277                         data += sizeof(struct eckd_count);
2278                         ect->cyl = address.cyl;
2279                         ect->head = address.head;
2280                         ect->record = 0;
2281                         ect->kl = 0;
2282                         ect->dl = 8;
2283                         ccw[-1].flags |= CCW_FLAG_CC;
2284                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2285                         ccw->flags = CCW_FLAG_SLI;
2286                         ccw->count = 8;
2287                         ccw->cda = (__u32)(addr_t) ect;
2288                         ccw++;
2289                 }
2290                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2291                         ect = (struct eckd_count *) data;
2292                         data += sizeof(struct eckd_count);
2293                         ect->cyl = address.cyl;
2294                         ect->head = address.head;
2295                         ect->record = 1;
2296                         ect->kl = 0;
2297                         ect->dl = 0;
2298                         ccw[-1].flags |= CCW_FLAG_CC;
2299                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2300                         ccw->flags = CCW_FLAG_SLI;
2301                         ccw->count = 8;
2302                         ccw->cda = (__u32)(addr_t) ect;
2303                 } else {                /* write remaining records */
2304                         for (i = 0; i < rpt; i++) {
2305                                 ect = (struct eckd_count *) data;
2306                                 data += sizeof(struct eckd_count);
2307                                 ect->cyl = address.cyl;
2308                                 ect->head = address.head;
2309                                 ect->record = i + 1;
2310                                 ect->kl = 0;
2311                                 ect->dl = fdata->blksize;
2312                                 /*
2313                                  * Check for special tracks 0-1
2314                                  * when formatting CDL
2315                                  */
2316                                 if ((intensity & 0x08) &&
2317                                     fdata->start_unit == 0) {
2318                                         if (i < 3) {
2319                                                 ect->kl = 4;
2320                                                 ect->dl = sizes_trk0[i] - 4;
2321                                         }
2322                                 }
2323                                 if ((intensity & 0x08) &&
2324                                     fdata->start_unit == 1) {
2325                                         ect->kl = 44;
2326                                         ect->dl = LABEL_SIZE - 44;
2327                                 }
2328                                 ccw[-1].flags |= CCW_FLAG_CC;
2329                                 if (i != 0 || j == 0)
2330                                         ccw->cmd_code =
2331                                                 DASD_ECKD_CCW_WRITE_CKD;
2332                                 else
2333                                         ccw->cmd_code =
2334                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2335                                 ccw->flags = CCW_FLAG_SLI;
2336                                 ccw->count = 8;
2337                                         ccw->cda = (__u32)(addr_t) ect;
2338                                         ccw++;
2339                         }
2340                 }
2341         }
2342 
2343         fcp->startdev = startdev;
2344         fcp->memdev = startdev;
2345         fcp->basedev = base;
2346         fcp->retries = 256;
2347         fcp->expires = startdev->default_expires * HZ;
2348         fcp->buildclk = get_tod_clock();
2349         fcp->status = DASD_CQR_FILLED;
2350 
2351         return fcp;
2352 }
2353 
2354 static int
2355 dasd_eckd_format_device(struct dasd_device *base,
2356                         struct format_data_t *fdata,
2357                         int enable_pav)
2358 {
2359         struct dasd_ccw_req *cqr, *n;
2360         struct dasd_block *block;
2361         struct dasd_eckd_private *private;
2362         struct list_head format_queue;
2363         struct dasd_device *device;
2364         int old_stop, format_step;
2365         int step, rc = 0, sleep_rc;
2366 
2367         block = base->block;
2368         private = (struct dasd_eckd_private *) base->private;
2369 
2370         /* Sanity checks. */
2371         if (fdata->start_unit >=
2372             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2373                 dev_warn(&base->cdev->dev,
2374                          "Start track number %u used in formatting is too big\n",
2375                          fdata->start_unit);
2376                 return -EINVAL;
2377         }
2378         if (fdata->stop_unit >=
2379             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2380                 dev_warn(&base->cdev->dev,
2381                          "Stop track number %u used in formatting is too big\n",
2382                          fdata->stop_unit);
2383                 return -EINVAL;
2384         }
2385         if (fdata->start_unit > fdata->stop_unit) {
2386                 dev_warn(&base->cdev->dev,
2387                          "Start track %u used in formatting exceeds end track\n",
2388                          fdata->start_unit);
2389                 return -EINVAL;
2390         }
2391         if (dasd_check_blocksize(fdata->blksize) != 0) {
2392                 dev_warn(&base->cdev->dev,
2393                          "The DASD cannot be formatted with block size %u\n",
2394                          fdata->blksize);
2395                 return -EINVAL;
2396         }
2397 
2398         INIT_LIST_HEAD(&format_queue);
2399 
2400         old_stop = fdata->stop_unit;
2401         while (fdata->start_unit <= 1) {
2402                 fdata->stop_unit = fdata->start_unit;
2403                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2404                 list_add(&cqr->blocklist, &format_queue);
2405 
2406                 fdata->stop_unit = old_stop;
2407                 fdata->start_unit++;
2408 
2409                 if (fdata->start_unit > fdata->stop_unit)
2410                         goto sleep;
2411         }
2412 
2413 retry:
2414         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2415                                            fdata->blksize);
2416         while (fdata->start_unit <= old_stop) {
2417                 step = fdata->stop_unit - fdata->start_unit + 1;
2418                 if (step > format_step)
2419                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2420 
2421                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2422                 if (IS_ERR(cqr)) {
2423                         if (PTR_ERR(cqr) == -ENOMEM) {
2424                                 /*
2425                                  * not enough memory available
2426                                  * go to out and start requests
2427                                  * retry after first requests were finished
2428                                  */
2429                                 fdata->stop_unit = old_stop;
2430                                 goto sleep;
2431                         } else
2432                                 return PTR_ERR(cqr);
2433                 }
2434                 list_add(&cqr->blocklist, &format_queue);
2435 
2436                 fdata->start_unit = fdata->stop_unit + 1;
2437                 fdata->stop_unit = old_stop;
2438         }
2439 
2440 sleep:
2441         sleep_rc = dasd_sleep_on_queue(&format_queue);
2442 
2443         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2444                 device = cqr->startdev;
2445                 private = (struct dasd_eckd_private *) device->private;
2446                 if (cqr->status == DASD_CQR_FAILED)
2447                         rc = -EIO;
2448                 list_del_init(&cqr->blocklist);
2449                 dasd_sfree_request(cqr, device);
2450                 private->count--;
2451         }
2452 
2453         if (sleep_rc)
2454                 return sleep_rc;
2455 
2456         /*
2457          * in case of ENOMEM we need to retry after
2458          * first requests are finished
2459          */
2460         if (fdata->start_unit <= fdata->stop_unit)
2461                 goto retry;
2462 
2463         return rc;
2464 }
2465 
2466 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2467 {
2468         if (cqr->retries < 0) {
2469                 cqr->status = DASD_CQR_FAILED;
2470                 return;
2471         }
2472         cqr->status = DASD_CQR_FILLED;
2473         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2474                 dasd_eckd_reset_ccw_to_base_io(cqr);
2475                 cqr->startdev = cqr->block->base;
2476                 cqr->lpm = cqr->block->base->path_data.opm;
2477         }
2478 };
2479 
2480 static dasd_erp_fn_t
2481 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2482 {
2483         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2484         struct ccw_device *cdev = device->cdev;
2485 
2486         switch (cdev->id.cu_type) {
2487         case 0x3990:
2488         case 0x2105:
2489         case 0x2107:
2490         case 0x1750:
2491                 return dasd_3990_erp_action;
2492         case 0x9343:
2493         case 0x3880:
2494         default:
2495                 return dasd_default_erp_action;
2496         }
2497 }
2498 
2499 static dasd_erp_fn_t
2500 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2501 {
2502         return dasd_default_erp_postaction;
2503 }
2504 
2505 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2506                                               struct dasd_ccw_req *cqr,
2507                                               struct irb *irb)
2508 {
2509         char mask;
2510         char *sense = NULL;
2511         struct dasd_eckd_private *private;
2512 
2513         private = (struct dasd_eckd_private *) device->private;
2514         /* first of all check for state change pending interrupt */
2515         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2516         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2517                 /*
2518                  * for alias only, not in offline processing
2519                  * and only if not suspended
2520                  */
2521                 if (!device->block && private->lcu &&
2522                     device->state == DASD_STATE_ONLINE &&
2523                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2524                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2525                         /*
2526                          * the state change could be caused by an alias
2527                          * reassignment remove device from alias handling
2528                          * to prevent new requests from being scheduled on
2529                          * the wrong alias device
2530                          */
2531                         dasd_alias_remove_device(device);
2532 
2533                         /* schedule worker to reload device */
2534                         dasd_reload_device(device);
2535                 }
2536                 dasd_generic_handle_state_change(device);
2537                 return;
2538         }
2539 
2540         sense = dasd_get_sense(irb);
2541         if (!sense)
2542                 return;
2543 
2544         /* summary unit check */
2545         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2546             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2547                 dasd_alias_handle_summary_unit_check(device, irb);
2548                 return;
2549         }
2550 
2551         /* service information message SIM */
2552         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2553             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2554                 dasd_3990_erp_handle_sim(device, sense);
2555                 return;
2556         }
2557 
2558         /* loss of device reservation is handled via base devices only
2559          * as alias devices may be used with several bases
2560          */
2561         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2562             (sense[7] == 0x3F) &&
2563             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2564             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2565                 if (device->features & DASD_FEATURE_FAILONSLCK)
2566                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2567                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2568                 dev_err(&device->cdev->dev,
2569                         "The device reservation was lost\n");
2570         }
2571 }
2572 
2573 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2574                                                struct dasd_device *startdev,
2575                                                struct dasd_block *block,
2576                                                struct request *req,
2577                                                sector_t first_rec,
2578                                                sector_t last_rec,
2579                                                sector_t first_trk,
2580                                                sector_t last_trk,
2581                                                unsigned int first_offs,
2582                                                unsigned int last_offs,
2583                                                unsigned int blk_per_trk,
2584                                                unsigned int blksize)
2585 {
2586         struct dasd_eckd_private *private;
2587         unsigned long *idaws;
2588         struct LO_eckd_data *LO_data;
2589         struct dasd_ccw_req *cqr;
2590         struct ccw1 *ccw;
2591         struct req_iterator iter;
2592         struct bio_vec bv;
2593         char *dst;
2594         unsigned int off;
2595         int count, cidaw, cplength, datasize;
2596         sector_t recid;
2597         unsigned char cmd, rcmd;
2598         int use_prefix;
2599         struct dasd_device *basedev;
2600 
2601         basedev = block->base;
2602         private = (struct dasd_eckd_private *) basedev->private;
2603         if (rq_data_dir(req) == READ)
2604                 cmd = DASD_ECKD_CCW_READ_MT;
2605         else if (rq_data_dir(req) == WRITE)
2606                 cmd = DASD_ECKD_CCW_WRITE_MT;
2607         else
2608                 return ERR_PTR(-EINVAL);
2609 
2610         /* Check struct bio and count the number of blocks for the request. */
2611         count = 0;
2612         cidaw = 0;
2613         rq_for_each_segment(bv, req, iter) {
2614                 if (bv.bv_len & (blksize - 1))
2615                         /* Eckd can only do full blocks. */
2616                         return ERR_PTR(-EINVAL);
2617                 count += bv.bv_len >> (block->s2b_shift + 9);
2618 #if defined(CONFIG_64BIT)
2619                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2620                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
2621 #endif
2622         }
2623         /* Paranoia. */
2624         if (count != last_rec - first_rec + 1)
2625                 return ERR_PTR(-EINVAL);
2626 
2627         /* use the prefix command if available */
2628         use_prefix = private->features.feature[8] & 0x01;
2629         if (use_prefix) {
2630                 /* 1x prefix + number of blocks */
2631                 cplength = 2 + count;
2632                 /* 1x prefix + cidaws*sizeof(long) */
2633                 datasize = sizeof(struct PFX_eckd_data) +
2634                         sizeof(struct LO_eckd_data) +
2635                         cidaw * sizeof(unsigned long);
2636         } else {
2637                 /* 1x define extent + 1x locate record + number of blocks */
2638                 cplength = 2 + count;
2639                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2640                 datasize = sizeof(struct DE_eckd_data) +
2641                         sizeof(struct LO_eckd_data) +
2642                         cidaw * sizeof(unsigned long);
2643         }
2644         /* Find out the number of additional locate record ccws for cdl. */
2645         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2646                 if (last_rec >= 2*blk_per_trk)
2647                         count = 2*blk_per_trk - first_rec;
2648                 cplength += count;
2649                 datasize += count*sizeof(struct LO_eckd_data);
2650         }
2651         /* Allocate the ccw request. */
2652         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2653                                    startdev);
2654         if (IS_ERR(cqr))
2655                 return cqr;
2656         ccw = cqr->cpaddr;
2657         /* First ccw is define extent or prefix. */
2658         if (use_prefix) {
2659                 if (prefix(ccw++, cqr->data, first_trk,
2660                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2661                         /* Clock not in sync and XRC is enabled.
2662                          * Try again later.
2663                          */
2664                         dasd_sfree_request(cqr, startdev);
2665                         return ERR_PTR(-EAGAIN);
2666                 }
2667                 idaws = (unsigned long *) (cqr->data +
2668                                            sizeof(struct PFX_eckd_data));
2669         } else {
2670                 if (define_extent(ccw++, cqr->data, first_trk,
2671                                   last_trk, cmd, basedev) == -EAGAIN) {
2672                         /* Clock not in sync and XRC is enabled.
2673                          * Try again later.
2674                          */
2675                         dasd_sfree_request(cqr, startdev);
2676                         return ERR_PTR(-EAGAIN);
2677                 }
2678                 idaws = (unsigned long *) (cqr->data +
2679                                            sizeof(struct DE_eckd_data));
2680         }
2681         /* Build locate_record+read/write/ccws. */
2682         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2683         recid = first_rec;
2684         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2685                 /* Only standard blocks so there is just one locate record. */
2686                 ccw[-1].flags |= CCW_FLAG_CC;
2687                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2688                               last_rec - recid + 1, cmd, basedev, blksize);
2689         }
2690         rq_for_each_segment(bv, req, iter) {
2691                 dst = page_address(bv.bv_page) + bv.bv_offset;
2692                 if (dasd_page_cache) {
2693                         char *copy = kmem_cache_alloc(dasd_page_cache,
2694                                                       GFP_DMA | __GFP_NOWARN);
2695                         if (copy && rq_data_dir(req) == WRITE)
2696                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2697                         if (copy)
2698                                 dst = copy + bv.bv_offset;
2699                 }
2700                 for (off = 0; off < bv.bv_len; off += blksize) {
2701                         sector_t trkid = recid;
2702                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2703                         rcmd = cmd;
2704                         count = blksize;
2705                         /* Locate record for cdl special block ? */
2706                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2707                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2708                                         rcmd |= 0x8;
2709                                         count = dasd_eckd_cdl_reclen(recid);
2710                                         if (count < blksize &&
2711                                             rq_data_dir(req) == READ)
2712                                                 memset(dst + count, 0xe5,
2713                                                        blksize - count);
2714                                 }
2715                                 ccw[-1].flags |= CCW_FLAG_CC;
2716                                 locate_record(ccw++, LO_data++,
2717                                               trkid, recoffs + 1,
2718                                               1, rcmd, basedev, count);
2719                         }
2720                         /* Locate record for standard blocks ? */
2721                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2722                                 ccw[-1].flags |= CCW_FLAG_CC;
2723                                 locate_record(ccw++, LO_data++,
2724                                               trkid, recoffs + 1,
2725                                               last_rec - recid + 1,
2726                                               cmd, basedev, count);
2727                         }
2728                         /* Read/write ccw. */
2729                         ccw[-1].flags |= CCW_FLAG_CC;
2730                         ccw->cmd_code = rcmd;
2731                         ccw->count = count;
2732                         if (idal_is_needed(dst, blksize)) {
2733                                 ccw->cda = (__u32)(addr_t) idaws;
2734                                 ccw->flags = CCW_FLAG_IDA;
2735                                 idaws = idal_create_words(idaws, dst, blksize);
2736                         } else {
2737                                 ccw->cda = (__u32)(addr_t) dst;
2738                                 ccw->flags = 0;
2739                         }
2740                         ccw++;
2741                         dst += blksize;
2742                         recid++;
2743                 }
2744         }
2745         if (blk_noretry_request(req) ||
2746             block->base->features & DASD_FEATURE_FAILFAST)
2747                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2748         cqr->startdev = startdev;
2749         cqr->memdev = startdev;
2750         cqr->block = block;
2751         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2752         cqr->lpm = startdev->path_data.ppm;
2753         cqr->retries = startdev->default_retries;
2754         cqr->buildclk = get_tod_clock();
2755         cqr->status = DASD_CQR_FILLED;
2756         return cqr;
2757 }
2758 
2759 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2760                                                struct dasd_device *startdev,
2761                                                struct dasd_block *block,
2762                                                struct request *req,
2763                                                sector_t first_rec,
2764                                                sector_t last_rec,
2765                                                sector_t first_trk,
2766                                                sector_t last_trk,
2767                                                unsigned int first_offs,
2768                                                unsigned int last_offs,
2769                                                unsigned int blk_per_trk,
2770                                                unsigned int blksize)
2771 {
2772         unsigned long *idaws;
2773         struct dasd_ccw_req *cqr;
2774         struct ccw1 *ccw;
2775         struct req_iterator iter;
2776         struct bio_vec bv;
2777         char *dst, *idaw_dst;
2778         unsigned int cidaw, cplength, datasize;
2779         unsigned int tlf;
2780         sector_t recid;
2781         unsigned char cmd;
2782         struct dasd_device *basedev;
2783         unsigned int trkcount, count, count_to_trk_end;
2784         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2785         unsigned char new_track, end_idaw;
2786         sector_t trkid;
2787         unsigned int recoffs;
2788 
2789         basedev = block->base;
2790         if (rq_data_dir(req) == READ)
2791                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2792         else if (rq_data_dir(req) == WRITE)
2793                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2794         else
2795                 return ERR_PTR(-EINVAL);
2796 
2797         /* Track based I/O needs IDAWs for each page, and not just for
2798          * 64 bit addresses. We need additional idals for pages
2799          * that get filled from two tracks, so we use the number
2800          * of records as upper limit.
2801          */
2802         cidaw = last_rec - first_rec + 1;
2803         trkcount = last_trk - first_trk + 1;
2804 
2805         /* 1x prefix + one read/write ccw per track */
2806         cplength = 1 + trkcount;
2807 
2808         /* on 31-bit we need space for two 32 bit addresses per page
2809          * on 64-bit one 64 bit address
2810          */
2811         datasize = sizeof(struct PFX_eckd_data) +
2812                 cidaw * sizeof(unsigned long long);
2813 
2814         /* Allocate the ccw request. */
2815         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2816                                    startdev);
2817         if (IS_ERR(cqr))
2818                 return cqr;
2819         ccw = cqr->cpaddr;
2820         /* transfer length factor: how many bytes to read from the last track */
2821         if (first_trk == last_trk)
2822                 tlf = last_offs - first_offs + 1;
2823         else
2824                 tlf = last_offs + 1;
2825         tlf *= blksize;
2826 
2827         if (prefix_LRE(ccw++, cqr->data, first_trk,
2828                        last_trk, cmd, basedev, startdev,
2829                        1 /* format */, first_offs + 1,
2830                        trkcount, blksize,
2831                        tlf) == -EAGAIN) {
2832                 /* Clock not in sync and XRC is enabled.
2833                  * Try again later.
2834                  */
2835                 dasd_sfree_request(cqr, startdev);
2836                 return ERR_PTR(-EAGAIN);
2837         }
2838 
2839         /*
2840          * The translation of request into ccw programs must meet the
2841          * following conditions:
2842          * - all idaws but the first and the last must address full pages
2843          *   (or 2K blocks on 31-bit)
2844          * - the scope of a ccw and it's idal ends with the track boundaries
2845          */
2846         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2847         recid = first_rec;
2848         new_track = 1;
2849         end_idaw = 0;
2850         len_to_track_end = 0;
2851         idaw_dst = NULL;
2852         idaw_len = 0;
2853         rq_for_each_segment(bv, req, iter) {
2854                 dst = page_address(bv.bv_page) + bv.bv_offset;
2855                 seg_len = bv.bv_len;
2856                 while (seg_len) {
2857                         if (new_track) {
2858                                 trkid = recid;
2859                                 recoffs = sector_div(trkid, blk_per_trk);
2860                                 count_to_trk_end = blk_per_trk - recoffs;
2861                                 count = min((last_rec - recid + 1),
2862                                             (sector_t)count_to_trk_end);
2863                                 len_to_track_end = count * blksize;
2864                                 ccw[-1].flags |= CCW_FLAG_CC;
2865                                 ccw->cmd_code = cmd;
2866                                 ccw->count = len_to_track_end;
2867                                 ccw->cda = (__u32)(addr_t)idaws;
2868                                 ccw->flags = CCW_FLAG_IDA;
2869                                 ccw++;
2870                                 recid += count;
2871                                 new_track = 0;
2872                                 /* first idaw for a ccw may start anywhere */
2873                                 if (!idaw_dst)
2874                                         idaw_dst = dst;
2875                         }
2876                         /* If we start a new idaw, we must make sure that it
2877                          * starts on an IDA_BLOCK_SIZE boundary.
2878                          * If we continue an idaw, we must make sure that the
2879                          * current segment begins where the so far accumulated
2880                          * idaw ends
2881                          */
2882                         if (!idaw_dst) {
2883                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2884                                         dasd_sfree_request(cqr, startdev);
2885                                         return ERR_PTR(-ERANGE);
2886                                 } else
2887                                         idaw_dst = dst;
2888                         }
2889                         if ((idaw_dst + idaw_len) != dst) {
2890                                 dasd_sfree_request(cqr, startdev);
2891                                 return ERR_PTR(-ERANGE);
2892                         }
2893                         part_len = min(seg_len, len_to_track_end);
2894                         seg_len -= part_len;
2895                         dst += part_len;
2896                         idaw_len += part_len;
2897                         len_to_track_end -= part_len;
2898                         /* collected memory area ends on an IDA_BLOCK border,
2899                          * -> create an idaw
2900                          * idal_create_words will handle cases where idaw_len
2901                          * is larger then IDA_BLOCK_SIZE
2902                          */
2903                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2904                                 end_idaw = 1;
2905                         /* We also need to end the idaw at track end */
2906                         if (!len_to_track_end) {
2907                                 new_track = 1;
2908                                 end_idaw = 1;
2909                         }
2910                         if (end_idaw) {
2911                                 idaws = idal_create_words(idaws, idaw_dst,
2912                                                           idaw_len);
2913                                 idaw_dst = NULL;
2914                                 idaw_len = 0;
2915                                 end_idaw = 0;
2916                         }
2917                 }
2918         }
2919 
2920         if (blk_noretry_request(req) ||
2921             block->base->features & DASD_FEATURE_FAILFAST)
2922                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2923         cqr->startdev = startdev;
2924         cqr->memdev = startdev;
2925         cqr->block = block;
2926         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2927         cqr->lpm = startdev->path_data.ppm;
2928         cqr->retries = startdev->default_retries;
2929         cqr->buildclk = get_tod_clock();
2930         cqr->status = DASD_CQR_FILLED;
2931         return cqr;
2932 }
2933 
2934 static int prepare_itcw(struct itcw *itcw,
2935                         unsigned int trk, unsigned int totrk, int cmd,
2936                         struct dasd_device *basedev,
2937                         struct dasd_device *startdev,
2938                         unsigned int rec_on_trk, int count,
2939                         unsigned int blksize,
2940                         unsigned int total_data_size,
2941                         unsigned int tlf,
2942                         unsigned int blk_per_trk)
2943 {
2944         struct PFX_eckd_data pfxdata;
2945         struct dasd_eckd_private *basepriv, *startpriv;
2946         struct DE_eckd_data *dedata;
2947         struct LRE_eckd_data *lredata;
2948         struct dcw *dcw;
2949 
2950         u32 begcyl, endcyl;
2951         u16 heads, beghead, endhead;
2952         u8 pfx_cmd;
2953 
2954         int rc = 0;
2955         int sector = 0;
2956         int dn, d;
2957 
2958 
2959         /* setup prefix data */
2960         basepriv = (struct dasd_eckd_private *) basedev->private;
2961         startpriv = (struct dasd_eckd_private *) startdev->private;
2962         dedata = &pfxdata.define_extent;
2963         lredata = &pfxdata.locate_record;
2964 
2965         memset(&pfxdata, 0, sizeof(pfxdata));
2966         pfxdata.format = 1; /* PFX with LRE */
2967         pfxdata.base_address = basepriv->ned->unit_addr;
2968         pfxdata.base_lss = basepriv->ned->ID;
2969         pfxdata.validity.define_extent = 1;
2970 
2971         /* private uid is kept up to date, conf_data may be outdated */
2972         if (startpriv->uid.type != UA_BASE_DEVICE) {
2973                 pfxdata.validity.verify_base = 1;
2974                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2975                         pfxdata.validity.hyper_pav = 1;
2976         }
2977 
2978         switch (cmd) {
2979         case DASD_ECKD_CCW_READ_TRACK_DATA:
2980                 dedata->mask.perm = 0x1;
2981                 dedata->attributes.operation = basepriv->attrib.operation;
2982                 dedata->blk_size = blksize;
2983                 dedata->ga_extended |= 0x42;
2984                 lredata->operation.orientation = 0x0;
2985                 lredata->operation.operation = 0x0C;
2986                 lredata->auxiliary.check_bytes = 0x01;
2987                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2988                 break;
2989         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2990                 dedata->mask.perm = 0x02;
2991                 dedata->attributes.operation = basepriv->attrib.operation;
2992                 dedata->blk_size = blksize;
2993                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2994                 dedata->ga_extended |= 0x42;
2995                 lredata->operation.orientation = 0x0;
2996                 lredata->operation.operation = 0x3F;
2997                 lredata->extended_operation = 0x23;
2998                 lredata->auxiliary.check_bytes = 0x2;
2999                 pfx_cmd = DASD_ECKD_CCW_PFX;
3000                 break;
3001         default:
3002                 DBF_DEV_EVENT(DBF_ERR, basedev,
3003                               "prepare itcw, unknown opcode 0x%x", cmd);
3004                 BUG();
3005                 break;
3006         }
3007         if (rc)
3008                 return rc;
3009 
3010         dedata->attributes.mode = 0x3;  /* ECKD */
3011 
3012         heads = basepriv->rdc_data.trk_per_cyl;
3013         begcyl = trk / heads;
3014         beghead = trk % heads;
3015         endcyl = totrk / heads;
3016         endhead = totrk % heads;
3017 
3018         /* check for sequential prestage - enhance cylinder range */
3019         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3020             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3021 
3022                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3023                         endcyl += basepriv->attrib.nr_cyl;
3024                 else
3025                         endcyl = (basepriv->real_cyl - 1);
3026         }
3027 
3028         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3029         set_ch_t(&dedata->end_ext, endcyl, endhead);
3030 
3031         dedata->ep_format = 0x20; /* records per track is valid */
3032         dedata->ep_rec_per_track = blk_per_trk;
3033 
3034         if (rec_on_trk) {
3035                 switch (basepriv->rdc_data.dev_type) {
3036                 case 0x3390:
3037                         dn = ceil_quot(blksize + 6, 232);
3038                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3039                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3040                         break;
3041                 case 0x3380:
3042                         d = 7 + ceil_quot(blksize + 12, 32);
3043                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3044                         break;
3045                 }
3046         }
3047 
3048         lredata->auxiliary.length_valid = 1;
3049         lredata->auxiliary.length_scope = 1;
3050         lredata->auxiliary.imbedded_ccw_valid = 1;
3051         lredata->length = tlf;
3052         lredata->imbedded_ccw = cmd;
3053         lredata->count = count;
3054         lredata->sector = sector;
3055         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3056         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3057         lredata->search_arg.head = lredata->seek_addr.head;
3058         lredata->search_arg.record = rec_on_trk;
3059 
3060         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3061                      &pfxdata, sizeof(pfxdata), total_data_size);
3062         return PTR_RET(dcw);
3063 }
3064 
3065 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3066                                                struct dasd_device *startdev,
3067                                                struct dasd_block *block,
3068                                                struct request *req,
3069                                                sector_t first_rec,
3070                                                sector_t last_rec,
3071                                                sector_t first_trk,
3072                                                sector_t last_trk,
3073                                                unsigned int first_offs,
3074                                                unsigned int last_offs,
3075                                                unsigned int blk_per_trk,
3076                                                unsigned int blksize)
3077 {
3078         struct dasd_ccw_req *cqr;
3079         struct req_iterator iter;
3080         struct bio_vec bv;
3081         char *dst;
3082         unsigned int trkcount, ctidaw;
3083         unsigned char cmd;
3084         struct dasd_device *basedev;
3085         unsigned int tlf;
3086         struct itcw *itcw;
3087         struct tidaw *last_tidaw = NULL;
3088         int itcw_op;
3089         size_t itcw_size;
3090         u8 tidaw_flags;
3091         unsigned int seg_len, part_len, len_to_track_end;
3092         unsigned char new_track;
3093         sector_t recid, trkid;
3094         unsigned int offs;
3095         unsigned int count, count_to_trk_end;
3096         int ret;
3097 
3098         basedev = block->base;
3099         if (rq_data_dir(req) == READ) {
3100                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3101                 itcw_op = ITCW_OP_READ;
3102         } else if (rq_data_dir(req) == WRITE) {
3103                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3104                 itcw_op = ITCW_OP_WRITE;
3105         } else
3106                 return ERR_PTR(-EINVAL);
3107 
3108         /* trackbased I/O needs address all memory via TIDAWs,
3109          * not just for 64 bit addresses. This allows us to map
3110          * each segment directly to one tidaw.
3111          * In the case of write requests, additional tidaws may
3112          * be needed when a segment crosses a track boundary.
3113          */
3114         trkcount = last_trk - first_trk + 1;
3115         ctidaw = 0;
3116         rq_for_each_segment(bv, req, iter) {
3117                 ++ctidaw;
3118         }
3119         if (rq_data_dir(req) == WRITE)
3120                 ctidaw += (last_trk - first_trk);
3121 
3122         /* Allocate the ccw request. */
3123         itcw_size = itcw_calc_size(0, ctidaw, 0);
3124         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3125         if (IS_ERR(cqr))
3126                 return cqr;
3127 
3128         /* transfer length factor: how many bytes to read from the last track */
3129         if (first_trk == last_trk)
3130                 tlf = last_offs - first_offs + 1;
3131         else
3132                 tlf = last_offs + 1;
3133         tlf *= blksize;
3134 
3135         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3136         if (IS_ERR(itcw)) {
3137                 ret = -EINVAL;
3138                 goto out_error;
3139         }
3140         cqr->cpaddr = itcw_get_tcw(itcw);
3141         if (prepare_itcw(itcw, first_trk, last_trk,
3142                          cmd, basedev, startdev,
3143                          first_offs + 1,
3144                          trkcount, blksize,
3145                          (last_rec - first_rec + 1) * blksize,
3146                          tlf, blk_per_trk) == -EAGAIN) {
3147                 /* Clock not in sync and XRC is enabled.
3148                  * Try again later.
3149                  */
3150                 ret = -EAGAIN;
3151                 goto out_error;
3152         }
3153         len_to_track_end = 0;
3154         /*
3155          * A tidaw can address 4k of memory, but must not cross page boundaries
3156          * We can let the block layer handle this by setting
3157          * blk_queue_segment_boundary to page boundaries and
3158          * blk_max_segment_size to page size when setting up the request queue.
3159          * For write requests, a TIDAW must not cross track boundaries, because
3160          * we have to set the CBC flag on the last tidaw for each track.
3161          */
3162         if (rq_data_dir(req) == WRITE) {
3163                 new_track = 1;
3164                 recid = first_rec;
3165                 rq_for_each_segment(bv, req, iter) {
3166                         dst = page_address(bv.bv_page) + bv.bv_offset;
3167                         seg_len = bv.bv_len;
3168                         while (seg_len) {
3169                                 if (new_track) {
3170                                         trkid = recid;
3171                                         offs = sector_div(trkid, blk_per_trk);
3172                                         count_to_trk_end = blk_per_trk - offs;
3173                                         count = min((last_rec - recid + 1),
3174                                                     (sector_t)count_to_trk_end);
3175                                         len_to_track_end = count * blksize;
3176                                         recid += count;
3177                                         new_track = 0;
3178                                 }
3179                                 part_len = min(seg_len, len_to_track_end);
3180                                 seg_len -= part_len;
3181                                 len_to_track_end -= part_len;
3182                                 /* We need to end the tidaw at track end */
3183                                 if (!len_to_track_end) {
3184                                         new_track = 1;
3185                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3186                                 } else
3187                                         tidaw_flags = 0;
3188                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3189                                                             dst, part_len);
3190                                 if (IS_ERR(last_tidaw)) {
3191                                         ret = -EINVAL;
3192                                         goto out_error;
3193                                 }
3194                                 dst += part_len;
3195                         }
3196                 }
3197         } else {
3198                 rq_for_each_segment(bv, req, iter) {
3199                         dst = page_address(bv.bv_page) + bv.bv_offset;
3200                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3201                                                     dst, bv.bv_len);
3202                         if (IS_ERR(last_tidaw)) {
3203                                 ret = -EINVAL;
3204                                 goto out_error;
3205                         }
3206                 }
3207         }
3208         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3209         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3210         itcw_finalize(itcw);
3211 
3212         if (blk_noretry_request(req) ||
3213             block->base->features & DASD_FEATURE_FAILFAST)
3214                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3215         cqr->cpmode = 1;
3216         cqr->startdev = startdev;
3217         cqr->memdev = startdev;
3218         cqr->block = block;
3219         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3220         cqr->lpm = startdev->path_data.ppm;
3221         cqr->retries = startdev->default_retries;
3222         cqr->buildclk = get_tod_clock();
3223         cqr->status = DASD_CQR_FILLED;
3224         return cqr;
3225 out_error:
3226         dasd_sfree_request(cqr, startdev);
3227         return ERR_PTR(ret);
3228 }
3229 
3230 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3231                                                struct dasd_block *block,
3232                                                struct request *req)
3233 {
3234         int cmdrtd, cmdwtd;
3235         int use_prefix;
3236         int fcx_multitrack;
3237         struct dasd_eckd_private *private;
3238         struct dasd_device *basedev;
3239         sector_t first_rec, last_rec;
3240         sector_t first_trk, last_trk;
3241         unsigned int first_offs, last_offs;
3242         unsigned int blk_per_trk, blksize;
3243         int cdlspecial;
3244         unsigned int data_size;
3245         struct dasd_ccw_req *cqr;
3246 
3247         basedev = block->base;
3248         private = (struct dasd_eckd_private *) basedev->private;
3249 
3250         /* Calculate number of blocks/records per track. */
3251         blksize = block->bp_block;
3252         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3253         if (blk_per_trk == 0)
3254                 return ERR_PTR(-EINVAL);
3255         /* Calculate record id of first and last block. */
3256         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3257         first_offs = sector_div(first_trk, blk_per_trk);
3258         last_rec = last_trk =
3259                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3260         last_offs = sector_div(last_trk, blk_per_trk);
3261         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3262 
3263         fcx_multitrack = private->features.feature[40] & 0x20;
3264         data_size = blk_rq_bytes(req);
3265         if (data_size % blksize)
3266                 return ERR_PTR(-EINVAL);
3267         /* tpm write request add CBC data on each track boundary */
3268         if (rq_data_dir(req) == WRITE)
3269                 data_size += (last_trk - first_trk) * 4;
3270 
3271         /* is read track data and write track data in command mode supported? */
3272         cmdrtd = private->features.feature[9] & 0x20;
3273         cmdwtd = private->features.feature[12] & 0x40;
3274         use_prefix = private->features.feature[8] & 0x01;
3275 
3276         cqr = NULL;
3277         if (cdlspecial || dasd_page_cache) {
3278                 /* do nothing, just fall through to the cmd mode single case */
3279         } else if ((data_size <= private->fcx_max_data)
3280                    && (fcx_multitrack || (first_trk == last_trk))) {
3281                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3282                                                     first_rec, last_rec,
3283                                                     first_trk, last_trk,
3284                                                     first_offs, last_offs,
3285                                                     blk_per_trk, blksize);
3286                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3287                     (PTR_ERR(cqr) != -ENOMEM))
3288                         cqr = NULL;
3289         } else if (use_prefix &&
3290                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3291                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3292                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3293                                                    first_rec, last_rec,
3294                                                    first_trk, last_trk,
3295                                                    first_offs, last_offs,
3296                                                    blk_per_trk, blksize);
3297                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3298                     (PTR_ERR(cqr) != -ENOMEM))
3299                         cqr = NULL;
3300         }
3301         if (!cqr)
3302                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3303                                                     first_rec, last_rec,
3304                                                     first_trk, last_trk,
3305                                                     first_offs, last_offs,
3306                                                     blk_per_trk, blksize);
3307         return cqr;
3308 }
3309 
3310 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3311                                                struct dasd_block *block,
3312                                                struct request *req)
3313 {
3314         unsigned long *idaws;
3315         struct dasd_device *basedev;
3316         struct dasd_ccw_req *cqr;
3317         struct ccw1 *ccw;
3318         struct req_iterator iter;
3319         struct bio_vec bv;
3320         char *dst;
3321         unsigned char cmd;
3322         unsigned int trkcount;
3323         unsigned int seg_len, len_to_track_end;
3324         unsigned int first_offs;
3325         unsigned int cidaw, cplength, datasize;
3326         sector_t first_trk, last_trk, sectors;
3327         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3328         unsigned int pfx_datasize;
3329 
3330         /*
3331          * raw track access needs to be mutiple of 64k and on 64k boundary
3332          * For read requests we can fix an incorrect alignment by padding
3333          * the request with dummy pages.
3334          */
3335         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3336         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3337                 DASD_RAW_SECTORS_PER_TRACK;
3338         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3339                 DASD_RAW_SECTORS_PER_TRACK;
3340         basedev = block->base;
3341         if ((start_padding_sectors || end_padding_sectors) &&
3342             (rq_data_dir(req) == WRITE)) {
3343                 DBF_DEV_EVENT(DBF_ERR, basedev,
3344                               "raw write not track aligned (%lu,%lu) req %p",
3345                               start_padding_sectors, end_padding_sectors, req);
3346                 cqr = ERR_PTR(-EINVAL);
3347                 goto out;
3348         }
3349 
3350         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3351         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3352                 DASD_RAW_SECTORS_PER_TRACK;
3353         trkcount = last_trk - first_trk + 1;
3354         first_offs = 0;
3355 
3356         if (rq_data_dir(req) == READ)
3357                 cmd = DASD_ECKD_CCW_READ_TRACK;
3358         else if (rq_data_dir(req) == WRITE)
3359                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3360         else {
3361                 cqr = ERR_PTR(-EINVAL);
3362                 goto out;
3363         }
3364 
3365         /*
3366          * Raw track based I/O needs IDAWs for each page,
3367          * and not just for 64 bit addresses.
3368          */
3369         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3370 
3371         /* 1x prefix + one read/write ccw per track */
3372         cplength = 1 + trkcount;
3373 
3374         /*
3375          * struct PFX_eckd_data has up to 2 byte as extended parameter
3376          * this is needed for write full track and has to be mentioned
3377          * separately
3378          * add 8 instead of 2 to keep 8 byte boundary
3379          */
3380         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3381 
3382         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3383 
3384         /* Allocate the ccw request. */
3385         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3386                                    datasize, startdev);
3387         if (IS_ERR(cqr))
3388                 goto out;
3389         ccw = cqr->cpaddr;
3390 
3391         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3392                        basedev, startdev, 1 /* format */, first_offs + 1,
3393                        trkcount, 0, 0) == -EAGAIN) {
3394                 /* Clock not in sync and XRC is enabled.
3395                  * Try again later.
3396                  */
3397                 dasd_sfree_request(cqr, startdev);
3398                 cqr = ERR_PTR(-EAGAIN);
3399                 goto out;
3400         }
3401 
3402         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3403         len_to_track_end = 0;
3404         if (start_padding_sectors) {
3405                 ccw[-1].flags |= CCW_FLAG_CC;
3406                 ccw->cmd_code = cmd;
3407                 /* maximum 3390 track size */
3408                 ccw->count = 57326;
3409                 /* 64k map to one track */
3410                 len_to_track_end = 65536 - start_padding_sectors * 512;
3411                 ccw->cda = (__u32)(addr_t)idaws;
3412                 ccw->flags |= CCW_FLAG_IDA;
3413                 ccw->flags |= CCW_FLAG_SLI;
3414                 ccw++;
3415                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3416                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3417         }
3418         rq_for_each_segment(bv, req, iter) {
3419                 dst = page_address(bv.bv_page) + bv.bv_offset;
3420                 seg_len = bv.bv_len;
3421                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3422                         memset(dst, 0, seg_len);
3423                 if (!len_to_track_end) {
3424                         ccw[-1].flags |= CCW_FLAG_CC;
3425                         ccw->cmd_code = cmd;
3426                         /* maximum 3390 track size */
3427                         ccw->count = 57326;
3428                         /* 64k map to one track */
3429                         len_to_track_end = 65536;
3430                         ccw->cda = (__u32)(addr_t)idaws;
3431                         ccw->flags |= CCW_FLAG_IDA;
3432                         ccw->flags |= CCW_FLAG_SLI;
3433                         ccw++;
3434                 }
3435                 len_to_track_end -= seg_len;
3436                 idaws = idal_create_words(idaws, dst, seg_len);
3437         }
3438         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3439                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3440         if (blk_noretry_request(req) ||
3441             block->base->features & DASD_FEATURE_FAILFAST)
3442                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3443         cqr->startdev = startdev;
3444         cqr->memdev = startdev;
3445         cqr->block = block;
3446         cqr->expires = startdev->default_expires * HZ;
3447         cqr->lpm = startdev->path_data.ppm;
3448         cqr->retries = startdev->default_retries;
3449         cqr->buildclk = get_tod_clock();
3450         cqr->status = DASD_CQR_FILLED;
3451 
3452         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3453                 cqr = NULL;
3454 out:
3455         return cqr;
3456 }
3457 
3458 
3459 static int
3460 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3461 {
3462         struct dasd_eckd_private *private;
3463         struct ccw1 *ccw;
3464         struct req_iterator iter;
3465         struct bio_vec bv;
3466         char *dst, *cda;
3467         unsigned int blksize, blk_per_trk, off;
3468         sector_t recid;
3469         int status;
3470 
3471         if (!dasd_page_cache)
3472                 goto out;
3473         private = (struct dasd_eckd_private *) cqr->block->base->private;
3474         blksize = cqr->block->bp_block;
3475         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3476         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3477         ccw = cqr->cpaddr;
3478         /* Skip over define extent & locate record. */
3479         ccw++;
3480         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3481                 ccw++;
3482         rq_for_each_segment(bv, req, iter) {
3483                 dst = page_address(bv.bv_page) + bv.bv_offset;
3484                 for (off = 0; off < bv.bv_len; off += blksize) {
3485                         /* Skip locate record. */
3486                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3487                                 ccw++;
3488                         if (dst) {
3489                                 if (ccw->flags & CCW_FLAG_IDA)
3490                                         cda = *((char **)((addr_t) ccw->cda));
3491                                 else
3492                                         cda = (char *)((addr_t) ccw->cda);
3493                                 if (dst != cda) {
3494                                         if (rq_data_dir(req) == READ)
3495                                                 memcpy(dst, cda, bv.bv_len);
3496                                         kmem_cache_free(dasd_page_cache,
3497                                             (void *)((addr_t)cda & PAGE_MASK));
3498                                 }
3499                                 dst = NULL;
3500                         }
3501                         ccw++;
3502                         recid++;
3503                 }
3504         }
3505 out:
3506         status = cqr->status == DASD_CQR_DONE;
3507         dasd_sfree_request(cqr, cqr->memdev);
3508         return status;
3509 }
3510 
3511 /*
3512  * Modify ccw/tcw in cqr so it can be started on a base device.
3513  *
3514  * Note that this is not enough to restart the cqr!
3515  * Either reset cqr->startdev as well (summary unit check handling)
3516  * or restart via separate cqr (as in ERP handling).
3517  */
3518 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3519 {
3520         struct ccw1 *ccw;
3521         struct PFX_eckd_data *pfxdata;
3522         struct tcw *tcw;
3523         struct tccb *tccb;
3524         struct dcw *dcw;
3525 
3526         if (cqr->cpmode == 1) {
3527                 tcw = cqr->cpaddr;
3528                 tccb = tcw_get_tccb(tcw);
3529                 dcw = (struct dcw *)&tccb->tca[0];
3530                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3531                 pfxdata->validity.verify_base = 0;
3532                 pfxdata->validity.hyper_pav = 0;
3533         } else {
3534                 ccw = cqr->cpaddr;
3535                 pfxdata = cqr->data;
3536                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3537                         pfxdata->validity.verify_base = 0;
3538                         pfxdata->validity.hyper_pav = 0;
3539                 }
3540         }
3541 }
3542 
3543 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3544 
3545 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3546                                                      struct dasd_block *block,
3547                                                      struct request *req)
3548 {
3549         struct dasd_eckd_private *private;
3550         struct dasd_device *startdev;
3551         unsigned long flags;
3552         struct dasd_ccw_req *cqr;
3553 
3554         startdev = dasd_alias_get_start_dev(base);
3555         if (!startdev)
3556                 startdev = base;
3557         private = (struct dasd_eckd_private *) startdev->private;
3558         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3559                 return ERR_PTR(-EBUSY);
3560 
3561         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3562         private->count++;
3563         if ((base->features & DASD_FEATURE_USERAW))
3564                 cqr = dasd_raw_build_cp(startdev, block, req);
3565         else
3566                 cqr = dasd_eckd_build_cp(startdev, block, req);
3567         if (IS_ERR(cqr))
3568                 private->count--;
3569         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3570         return cqr;
3571 }
3572 
3573 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3574                                    struct request *req)
3575 {
3576         struct dasd_eckd_private *private;
3577         unsigned long flags;
3578 
3579         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3580         private = (struct dasd_eckd_private *) cqr->memdev->private;
3581         private->count--;
3582         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3583         return dasd_eckd_free_cp(cqr, req);
3584 }
3585 
3586 static int
3587 dasd_eckd_fill_info(struct dasd_device * device,
3588                     struct dasd_information2_t * info)
3589 {
3590         struct dasd_eckd_private *private;
3591 
3592         private = (struct dasd_eckd_private *) device->private;
3593         info->label_block = 2;
3594         info->FBA_layout = private->uses_cdl ? 0 : 1;
3595         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3596         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3597         memcpy(info->characteristics, &private->rdc_data,
3598                sizeof(struct dasd_eckd_characteristics));
3599         info->confdata_size = min((unsigned long)private->conf_len,
3600                                   sizeof(info->configuration_data));
3601         memcpy(info->configuration_data, private->conf_data,
3602                info->confdata_size);
3603         return 0;
3604 }
3605 
3606 /*
3607  * SECTION: ioctl functions for eckd devices.
3608  */
3609 
3610 /*
3611  * Release device ioctl.
3612  * Buils a channel programm to releases a prior reserved
3613  * (see dasd_eckd_reserve) device.
3614  */
3615 static int
3616 dasd_eckd_release(struct dasd_device *device)
3617 {
3618         struct dasd_ccw_req *cqr;
3619         int rc;
3620         struct ccw1 *ccw;
3621         int useglobal;
3622 
3623         if (!capable(CAP_SYS_ADMIN))
3624                 return -EACCES;
3625 
3626         useglobal = 0;
3627         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3628         if (IS_ERR(cqr)) {
3629                 mutex_lock(&dasd_reserve_mutex);
3630                 useglobal = 1;
3631                 cqr = &dasd_reserve_req->cqr;
3632                 memset(cqr, 0, sizeof(*cqr));
3633                 memset(&dasd_reserve_req->ccw, 0,
3634                        sizeof(dasd_reserve_req->ccw));
3635                 cqr->cpaddr = &dasd_reserve_req->ccw;
3636                 cqr->data = &dasd_reserve_req->data;
3637                 cqr->magic = DASD_ECKD_MAGIC;
3638         }
3639         ccw = cqr->cpaddr;
3640         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3641         ccw->flags |= CCW_FLAG_SLI;
3642         ccw->count = 32;
3643         ccw->cda = (__u32)(addr_t) cqr->data;
3644         cqr->startdev = device;
3645         cqr->memdev = device;
3646         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3647         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3648         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3649         cqr->expires = 2 * HZ;
3650         cqr->buildclk = get_tod_clock();
3651         cqr->status = DASD_CQR_FILLED;
3652 
3653         rc = dasd_sleep_on_immediatly(cqr);
3654         if (!rc)
3655                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3656 
3657         if (useglobal)
3658                 mutex_unlock(&dasd_reserve_mutex);
3659         else
3660                 dasd_sfree_request(cqr, cqr->memdev);
3661         return rc;
3662 }
3663 
3664 /*
3665  * Reserve device ioctl.
3666  * Options are set to 'synchronous wait for interrupt' and
3667  * 'timeout the request'. This leads to a terminate IO if
3668  * the interrupt is outstanding for a certain time.
3669  */
3670 static int
3671 dasd_eckd_reserve(struct dasd_device *device)
3672 {
3673         struct dasd_ccw_req *cqr;
3674         int rc;
3675         struct ccw1 *ccw;
3676         int useglobal;
3677 
3678         if (!capable(CAP_SYS_ADMIN))
3679                 return -EACCES;
3680 
3681         useglobal = 0;
3682         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3683         if (IS_ERR(cqr)) {
3684                 mutex_lock(&dasd_reserve_mutex);
3685                 useglobal = 1;
3686                 cqr = &dasd_reserve_req->cqr;
3687                 memset(cqr, 0, sizeof(*cqr));
3688                 memset(&dasd_reserve_req->ccw, 0,
3689                        sizeof(dasd_reserve_req->ccw));
3690                 cqr->cpaddr = &dasd_reserve_req->ccw;
3691                 cqr->data = &dasd_reserve_req->data;
3692                 cqr->magic = DASD_ECKD_MAGIC;
3693         }
3694         ccw = cqr->cpaddr;
3695         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3696         ccw->flags |= CCW_FLAG_SLI;
3697         ccw->count = 32;
3698         ccw->cda = (__u32)(addr_t) cqr->data;
3699         cqr->startdev = device;
3700         cqr->memdev = device;
3701         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3702         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3703         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3704         cqr->expires = 2 * HZ;
3705         cqr->buildclk = get_tod_clock();
3706         cqr->status = DASD_CQR_FILLED;
3707 
3708         rc = dasd_sleep_on_immediatly(cqr);
3709         if (!rc)
3710                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3711 
3712         if (useglobal)
3713                 mutex_unlock(&dasd_reserve_mutex);
3714         else
3715                 dasd_sfree_request(cqr, cqr->memdev);
3716         return rc;
3717 }
3718 
3719 /*
3720  * Steal lock ioctl - unconditional reserve device.
3721  * Buils a channel programm to break a device's reservation.
3722  * (unconditional reserve)
3723  */
3724 static int
3725 dasd_eckd_steal_lock(struct dasd_device *device)
3726 {
3727         struct dasd_ccw_req *cqr;
3728         int rc;
3729         struct ccw1 *ccw;
3730         int useglobal;
3731 
3732         if (!capable(CAP_SYS_ADMIN))
3733                 return -EACCES;
3734 
3735         useglobal = 0;
3736         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3737         if (IS_ERR(cqr)) {
3738                 mutex_lock(&dasd_reserve_mutex);
3739                 useglobal = 1;
3740                 cqr = &dasd_reserve_req->cqr;
3741                 memset(cqr, 0, sizeof(*cqr));
3742                 memset(&dasd_reserve_req->ccw, 0,
3743                        sizeof(dasd_reserve_req->ccw));
3744                 cqr->cpaddr = &dasd_reserve_req->ccw;
3745                 cqr->data = &dasd_reserve_req->data;
3746                 cqr->magic = DASD_ECKD_MAGIC;
3747         }
3748         ccw = cqr->cpaddr;
3749         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3750         ccw->flags |= CCW_FLAG_SLI;
3751         ccw->count = 32;
3752         ccw->cda = (__u32)(addr_t) cqr->data;
3753         cqr->startdev = device;
3754         cqr->memdev = device;
3755         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3756         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3757         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3758         cqr->expires = 2 * HZ;
3759         cqr->buildclk = get_tod_clock();
3760         cqr->status = DASD_CQR_FILLED;
3761 
3762         rc = dasd_sleep_on_immediatly(cqr);
3763         if (!rc)
3764                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3765 
3766         if (useglobal)
3767                 mutex_unlock(&dasd_reserve_mutex);
3768         else
3769                 dasd_sfree_request(cqr, cqr->memdev);
3770         return rc;
3771 }
3772 
3773 /*
3774  * SNID - Sense Path Group ID
3775  * This ioctl may be used in situations where I/O is stalled due to
3776  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3777  * preallocated dasd_reserve_req.
3778  */
3779 static int dasd_eckd_snid(struct dasd_device *device,
3780                           void __user *argp)
3781 {
3782         struct dasd_ccw_req *cqr;
3783         int rc;
3784         struct ccw1 *ccw;
3785         int useglobal;
3786         struct dasd_snid_ioctl_data usrparm;
3787 
3788         if (!capable(CAP_SYS_ADMIN))
3789                 return -EACCES;
3790 
3791         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3792                 return -EFAULT;
3793 
3794         useglobal = 0;
3795         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3796                                    sizeof(struct dasd_snid_data), device);
3797         if (IS_ERR(cqr)) {
3798                 mutex_lock(&dasd_reserve_mutex);
3799                 useglobal = 1;
3800                 cqr = &dasd_reserve_req->cqr;
3801                 memset(cqr, 0, sizeof(*cqr));
3802                 memset(&dasd_reserve_req->ccw, 0,
3803                        sizeof(dasd_reserve_req->ccw));
3804                 cqr->cpaddr = &dasd_reserve_req->ccw;
3805                 cqr->data = &dasd_reserve_req->data;
3806                 cqr->magic = DASD_ECKD_MAGIC;
3807         }
3808         ccw = cqr->cpaddr;
3809         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3810         ccw->flags |= CCW_FLAG_SLI;
3811         ccw->count = 12;
3812         ccw->cda = (__u32)(addr_t) cqr->data;
3813         cqr->startdev = device;
3814         cqr->memdev = device;
3815         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3816         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3817         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3818         cqr->retries = 5;
3819         cqr->expires = 10 * HZ;
3820         cqr->buildclk = get_tod_clock();
3821         cqr->status = DASD_CQR_FILLED;
3822         cqr->lpm = usrparm.path_mask;
3823 
3824         rc = dasd_sleep_on_immediatly(cqr);
3825         /* verify that I/O processing didn't modify the path mask */
3826         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3827                 rc = -EIO;
3828         if (!rc) {
3829                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3830                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3831                         rc = -EFAULT;
3832         }
3833 
3834         if (useglobal)
3835                 mutex_unlock(&dasd_reserve_mutex);
3836         else
3837                 dasd_sfree_request(cqr, cqr->memdev);
3838         return rc;
3839 }
3840 
3841 /*
3842  * Read performance statistics
3843  */
3844 static int
3845 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3846 {
3847         struct dasd_psf_prssd_data *prssdp;
3848         struct dasd_rssd_perf_stats_t *stats;
3849         struct dasd_ccw_req *cqr;
3850         struct ccw1 *ccw;
3851         int rc;
3852 
3853         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3854                                    (sizeof(struct dasd_psf_prssd_data) +
3855                                     sizeof(struct dasd_rssd_perf_stats_t)),
3856                                    device);
3857         if (IS_ERR(cqr)) {
3858                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3859                             "Could not allocate initialization request");
3860                 return PTR_ERR(cqr);
3861         }
3862         cqr->startdev = device;
3863         cqr->memdev = device;
3864         cqr->retries = 0;
3865         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3866         cqr->expires = 10 * HZ;
3867 
3868         /* Prepare for Read Subsystem Data */
3869         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3870         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3871         prssdp->order = PSF_ORDER_PRSSD;
3872         prssdp->suborder = 0x01;        /* Performance Statistics */
3873         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3874 
3875         ccw = cqr->cpaddr;
3876         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3877         ccw->count = sizeof(struct dasd_psf_prssd_data);
3878         ccw->flags |= CCW_FLAG_CC;
3879         ccw->cda = (__u32)(addr_t) prssdp;
3880 
3881         /* Read Subsystem Data - Performance Statistics */
3882         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3883         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3884 
3885         ccw++;
3886         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3887         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3888         ccw->cda = (__u32)(addr_t) stats;
3889 
3890         cqr->buildclk = get_tod_clock();
3891         cqr->status = DASD_CQR_FILLED;
3892         rc = dasd_sleep_on(cqr);
3893         if (rc == 0) {
3894                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3895                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3896                 if (copy_to_user(argp, stats,
3897                                  sizeof(struct dasd_rssd_perf_stats_t)))
3898                         rc = -EFAULT;
3899         }
3900         dasd_sfree_request(cqr, cqr->memdev);
3901         return rc;
3902 }
3903 
3904 /*
3905  * Get attributes (cache operations)
3906  * Returnes the cache attributes used in Define Extend (DE).
3907  */
3908 static int
3909 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3910 {
3911         struct dasd_eckd_private *private =
3912                 (struct dasd_eckd_private *)device->private;
3913         struct attrib_data_t attrib = private->attrib;
3914         int rc;
3915 
3916         if (!capable(CAP_SYS_ADMIN))
3917                 return -EACCES;
3918         if (!argp)
3919                 return -EINVAL;
3920 
3921         rc = 0;
3922         if (copy_to_user(argp, (long *) &attrib,
3923                          sizeof(struct attrib_data_t)))
3924                 rc = -EFAULT;
3925 
3926         return rc;
3927 }
3928 
3929 /*
3930  * Set attributes (cache operations)
3931  * Stores the attributes for cache operation to be used in Define Extend (DE).
3932  */
3933 static int
3934 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3935 {
3936         struct dasd_eckd_private *private =
3937                 (struct dasd_eckd_private *)device->private;
3938         struct attrib_data_t attrib;
3939 
3940         if (!capable(CAP_SYS_ADMIN))
3941                 return -EACCES;
3942         if (!argp)
3943                 return -EINVAL;
3944 
3945         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3946                 return -EFAULT;
3947         private->attrib = attrib;
3948 
3949         dev_info(&device->cdev->dev,
3950                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3951                  private->attrib.operation, private->attrib.nr_cyl);
3952         return 0;
3953 }
3954 
3955 /*
3956  * Issue syscall I/O to EMC Symmetrix array.
3957  * CCWs are PSF and RSSD
3958  */
3959 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3960 {
3961         struct dasd_symmio_parms usrparm;
3962         char *psf_data, *rssd_result;
3963         struct dasd_ccw_req *cqr;
3964         struct ccw1 *ccw;
3965         char psf0, psf1;
3966         int rc;
3967 
3968         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3969                 return -EACCES;
3970         psf0 = psf1 = 0;
3971 
3972         /* Copy parms from caller */
3973         rc = -EFAULT;
3974         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3975                 goto out;
3976         if (is_compat_task() || sizeof(long) == 4) {
3977                 /* Make sure pointers are sane even on 31 bit. */
3978                 rc = -EINVAL;
3979                 if ((usrparm.psf_data >> 32) != 0)
3980                         goto out;
3981                 if ((usrparm.rssd_result >> 32) != 0)
3982                         goto out;
3983                 usrparm.psf_data &= 0x7fffffffULL;
3984                 usrparm.rssd_result &= 0x7fffffffULL;
3985         }
3986         /* alloc I/O data area */
3987         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3988         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3989         if (!psf_data || !rssd_result) {
3990                 rc = -ENOMEM;
3991                 goto out_free;
3992         }
3993 
3994         /* get syscall header from user space */
3995         rc = -EFAULT;
3996         if (copy_from_user(psf_data,
3997                            (void __user *)(unsigned long) usrparm.psf_data,
3998                            usrparm.psf_data_len))
3999                 goto out_free;
4000         psf0 = psf_data[0];
4001         psf1 = psf_data[1];
4002 
4003         /* setup CCWs for PSF + RSSD */
4004         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4005         if (IS_ERR(cqr)) {
4006                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4007                         "Could not allocate initialization request");
4008                 rc = PTR_ERR(cqr);
4009                 goto out_free;
4010         }
4011 
4012         cqr->startdev = device;
4013         cqr->memdev = device;
4014         cqr->retries = 3;
4015         cqr->expires = 10 * HZ;
4016         cqr->buildclk = get_tod_clock();
4017         cqr->status = DASD_CQR_FILLED;
4018 
4019         /* Build the ccws */
4020         ccw = cqr->cpaddr;
4021 
4022         /* PSF ccw */
4023         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4024         ccw->count = usrparm.psf_data_len;
4025         ccw->flags |= CCW_FLAG_CC;
4026         ccw->cda = (__u32)(addr_t) psf_data;
4027 
4028         ccw++;
4029 
4030         /* RSSD ccw  */
4031         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4032         ccw->count = usrparm.rssd_result_len;
4033         ccw->flags = CCW_FLAG_SLI ;
4034         ccw->cda = (__u32)(addr_t) rssd_result;
4035 
4036         rc = dasd_sleep_on(cqr);
4037         if (rc)
4038                 goto out_sfree;
4039 
4040         rc = -EFAULT;
4041         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4042                            rssd_result, usrparm.rssd_result_len))
4043                 goto out_sfree;
4044         rc = 0;
4045 
4046 out_sfree:
4047         dasd_sfree_request(cqr, cqr->memdev);
4048 out_free:
4049         kfree(rssd_result);
4050         kfree(psf_data);
4051 out:
4052         DBF_DEV_EVENT(DBF_WARNING, device,
4053                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4054                       (int) psf0, (int) psf1, rc);
4055         return rc;
4056 }
4057 
4058 static int
4059 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4060 {
4061         struct dasd_device *device = block->base;
4062 
4063         switch (cmd) {
4064         case BIODASDGATTR:
4065                 return dasd_eckd_get_attrib(device, argp);
4066         case BIODASDSATTR:
4067                 return dasd_eckd_set_attrib(device, argp);
4068         case BIODASDPSRD:
4069                 return dasd_eckd_performance(device, argp);
4070         case BIODASDRLSE:
4071                 return dasd_eckd_release(device);
4072         case BIODASDRSRV:
4073                 return dasd_eckd_reserve(device);
4074         case BIODASDSLCK:
4075                 return dasd_eckd_steal_lock(device);
4076         case BIODASDSNID:
4077                 return dasd_eckd_snid(device, argp);
4078         case BIODASDSYMMIO:
4079                 return dasd_symm_io(device, argp);
4080         default:
4081                 return -ENOTTY;
4082         }
4083 }
4084 
4085 /*
4086  * Dump the range of CCWs into 'page' buffer
4087  * and return number of printed chars.
4088  */
4089 static int
4090 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4091 {
4092         int len, count;
4093         char *datap;
4094 
4095         len = 0;
4096         while (from <= to) {
4097                 len += sprintf(page + len, PRINTK_HEADER
4098                                " CCW %p: %08X %08X DAT:",
4099                                from, ((int *) from)[0], ((int *) from)[1]);
4100 
4101                 /* get pointer to data (consider IDALs) */
4102                 if (from->flags & CCW_FLAG_IDA)
4103                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4104                 else
4105                         datap = (char *) ((addr_t) from->cda);
4106 
4107                 /* dump data (max 32 bytes) */
4108                 for (count = 0; count < from->count && count < 32; count++) {
4109                         if (count % 8 == 0) len += sprintf(page + len, " ");
4110                         if (count % 4 == 0) len += sprintf(page + len, " ");
4111                         len += sprintf(page + len, "%02x", datap[count]);
4112                 }
4113                 len += sprintf(page + len, "\n");
4114                 from++;
4115         }
4116         return len;
4117 }
4118 
4119 static void
4120 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4121                          char *reason)
4122 {
4123         u64 *sense;
4124         u64 *stat;
4125 
4126         sense = (u64 *) dasd_get_sense(irb);
4127         stat = (u64 *) &irb->scsw;
4128         if (sense) {
4129                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4130                               "%016llx %016llx %016llx %016llx",
4131                               reason, *stat, *((u32 *) (stat + 1)),
4132                               sense[0], sense[1], sense[2], sense[3]);
4133         } else {
4134                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4135                               reason, *stat, *((u32 *) (stat + 1)),
4136                               "NO VALID SENSE");
4137         }
4138 }
4139 
4140 /*
4141  * Print sense data and related channel program.
4142  * Parts are printed because printk buffer is only 1024 bytes.
4143  */
4144 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4145                                  struct dasd_ccw_req *req, struct irb *irb)
4146 {
4147         char *page;
4148         struct ccw1 *first, *last, *fail, *from, *to;
4149         int len, sl, sct;
4150 
4151         page = (char *) get_zeroed_page(GFP_ATOMIC);
4152         if (page == NULL) {
4153                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4154                               "No memory to dump sense data\n");
4155                 return;
4156         }
4157         /* dump the sense data */
4158         len = sprintf(page, PRINTK_HEADER
4159                       " I/O status report for device %s:\n",
4160                       dev_name(&device->cdev->dev));
4161         len += sprintf(page + len, PRINTK_HEADER
4162                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4163                        "CS:%02X RC:%d\n",
4164                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4165                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4166                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4167                        req ? req->intrc : 0);
4168         len += sprintf(page + len, PRINTK_HEADER
4169                        " device %s: Failing CCW: %p\n",
4170                        dev_name(&device->cdev->dev),
4171                        (void *) (addr_t) irb->scsw.cmd.cpa);
4172         if (irb->esw.esw0.erw.cons) {
4173                 for (sl = 0; sl < 4; sl++) {
4174                         len += sprintf(page + len, PRINTK_HEADER
4175                                        " Sense(hex) %2d-%2d:",
4176                                        (8 * sl), ((8 * sl) + 7));
4177 
4178                         for (sct = 0; sct < 8; sct++) {
4179                                 len += sprintf(page + len, " %02x",
4180                                                irb->ecw[8 * sl + sct]);
4181                         }
4182                         len += sprintf(page + len, "\n");
4183                 }
4184 
4185                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4186                         /* 24 Byte Sense Data */
4187                         sprintf(page + len, PRINTK_HEADER
4188                                 " 24 Byte: %x MSG %x, "
4189                                 "%s MSGb to SYSOP\n",
4190                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4191                                 irb->ecw[1] & 0x10 ? "" : "no");
4192                 } else {
4193                         /* 32 Byte Sense Data */
4194                         sprintf(page + len, PRINTK_HEADER
4195                                 " 32 Byte: Format: %x "
4196                                 "Exception class %x\n",
4197                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4198                 }
4199         } else {
4200                 sprintf(page + len, PRINTK_HEADER
4201                         " SORRY - NO VALID SENSE AVAILABLE\n");
4202         }
4203         printk(KERN_ERR "%s", page);
4204 
4205         if (req) {
4206                 /* req == NULL for unsolicited interrupts */
4207                 /* dump the Channel Program (max 140 Bytes per line) */
4208                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4209                 first = req->cpaddr;
4210                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4211                 to = min(first + 6, last);
4212                 len = sprintf(page, PRINTK_HEADER
4213                               " Related CP in req: %p\n", req);
4214                 dasd_eckd_dump_ccw_range(first, to, page + len);
4215                 printk(KERN_ERR "%s", page);
4216 
4217                 /* print failing CCW area (maximum 4) */
4218                 /* scsw->cda is either valid or zero  */
4219                 len = 0;
4220                 from = ++to;
4221                 fail = (struct ccw1 *)(addr_t)
4222                                 irb->scsw.cmd.cpa; /* failing CCW */
4223                 if (from <  fail - 2) {
4224                         from = fail - 2;     /* there is a gap - print header */
4225                         len += sprintf(page, PRINTK_HEADER "......\n");
4226                 }
4227                 to = min(fail + 1, last);
4228                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4229 
4230                 /* print last CCWs (maximum 2) */
4231                 from = max(from, ++to);
4232                 if (from < last - 1) {
4233                         from = last - 1;     /* there is a gap - print header */
4234                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4235                 }
4236                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4237                 if (len > 0)
4238                         printk(KERN_ERR "%s", page);
4239         }
4240         free_page((unsigned long) page);
4241 }
4242 
4243 
4244 /*
4245  * Print sense data from a tcw.
4246  */
4247 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4248                                  struct dasd_ccw_req *req, struct irb *irb)
4249 {
4250         char *page;
4251         int len, sl, sct, residual;
4252         struct tsb *tsb;
4253         u8 *sense, *rcq;
4254 
4255         page = (char *) get_zeroed_page(GFP_ATOMIC);
4256         if (page == NULL) {
4257                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4258                             "No memory to dump sense data");
4259                 return;
4260         }
4261         /* dump the sense data */
4262         len = sprintf(page, PRINTK_HEADER
4263                       " I/O status report for device %s:\n",
4264                       dev_name(&device->cdev->dev));
4265         len += sprintf(page + len, PRINTK_HEADER
4266                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4267                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4268                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4269                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4270                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4271                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4272                        req ? req->intrc : 0);
4273         len += sprintf(page + len, PRINTK_HEADER
4274                        " device %s: Failing TCW: %p\n",
4275                        dev_name(&device->cdev->dev),
4276                        (void *) (addr_t) irb->scsw.tm.tcw);
4277 
4278         tsb = NULL;
4279         sense = NULL;
4280         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4281                 tsb = tcw_get_tsb(
4282                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4283 
4284         if (tsb) {
4285                 len += sprintf(page + len, PRINTK_HEADER
4286                                " tsb->length %d\n", tsb->length);
4287                 len += sprintf(page + len, PRINTK_HEADER
4288                                " tsb->flags %x\n", tsb->flags);
4289                 len += sprintf(page + len, PRINTK_HEADER
4290                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4291                 len += sprintf(page + len, PRINTK_HEADER
4292                                " tsb->count %d\n", tsb->count);
4293                 residual = tsb->count - 28;
4294                 len += sprintf(page + len, PRINTK_HEADER
4295                                " residual %d\n", residual);
4296 
4297                 switch (tsb->flags & 0x07) {
4298                 case 1: /* tsa_iostat */
4299                         len += sprintf(page + len, PRINTK_HEADER
4300                                " tsb->tsa.iostat.dev_time %d\n",
4301                                        tsb->tsa.iostat.dev_time);
4302                         len += sprintf(page + len, PRINTK_HEADER
4303                                " tsb->tsa.iostat.def_time %d\n",
4304                                        tsb->tsa.iostat.def_time);
4305                         len += sprintf(page + len, PRINTK_HEADER
4306                                " tsb->tsa.iostat.queue_time %d\n",
4307                                        tsb->tsa.iostat.queue_time);
4308                         len += sprintf(page + len, PRINTK_HEADER
4309                                " tsb->tsa.iostat.dev_busy_time %d\n",
4310                                        tsb->tsa.iostat.dev_busy_time);
4311                         len += sprintf(page + len, PRINTK_HEADER
4312                                " tsb->tsa.iostat.dev_act_time %d\n",
4313                                        tsb->tsa.iostat.dev_act_time);
4314                         sense = tsb->tsa.iostat.sense;
4315                         break;
4316                 case 2: /* ts_ddpc */
4317                         len += sprintf(page + len, PRINTK_HEADER
4318                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4319                         for (sl = 0; sl < 2; sl++) {
4320                                 len += sprintf(page + len, PRINTK_HEADER
4321                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4322                                                (8 * sl), ((8 * sl) + 7));
4323                                 rcq = tsb->tsa.ddpc.rcq;
4324                                 for (sct = 0; sct < 8; sct++) {
4325                                         len += sprintf(page + len, " %02x",
4326                                                        rcq[8 * sl + sct]);
4327                                 }
4328                                 len += sprintf(page + len, "\n");
4329                         }
4330                         sense = tsb->tsa.ddpc.sense;
4331                         break;
4332                 case 3: /* tsa_intrg */
4333                         len += sprintf(page + len, PRINTK_HEADER
4334                                       " tsb->tsa.intrg.: not supportet yet\n");
4335                         break;
4336                 }
4337 
4338                 if (sense) {
4339                         for (sl = 0; sl < 4; sl++) {
4340                                 len += sprintf(page + len, PRINTK_HEADER
4341                                                " Sense(hex) %2d-%2d:",
4342                                                (8 * sl), ((8 * sl) + 7));
4343                                 for (sct = 0; sct < 8; sct++) {
4344                                         len += sprintf(page + len, " %02x",
4345                                                        sense[8 * sl + sct]);
4346                                 }
4347                                 len += sprintf(page + len, "\n");
4348                         }
4349 
4350                         if (sense[27] & DASD_SENSE_BIT_0) {
4351                                 /* 24 Byte Sense Data */
4352                                 sprintf(page + len, PRINTK_HEADER
4353                                         " 24 Byte: %x MSG %x, "
4354                                         "%s MSGb to SYSOP\n",
4355                                         sense[7] >> 4, sense[7] & 0x0f,
4356                                         sense[1] & 0x10 ? "" : "no");
4357                         } else {
4358                                 /* 32 Byte Sense Data */
4359                                 sprintf(page + len, PRINTK_HEADER
4360                                         " 32 Byte: Format: %x "
4361                                         "Exception class %x\n",
4362                                         sense[6] & 0x0f, sense[22] >> 4);
4363                         }
4364                 } else {
4365                         sprintf(page + len, PRINTK_HEADER
4366                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4367                 }
4368         } else {
4369                 sprintf(page + len, PRINTK_HEADER
4370                         " SORRY - NO TSB DATA AVAILABLE\n");
4371         }
4372         printk(KERN_ERR "%s", page);
4373         free_page((unsigned long) page);
4374 }
4375 
4376 static void dasd_eckd_dump_sense(struct dasd_device *device,
4377                                  struct dasd_ccw_req *req, struct irb *irb)
4378 {
4379         if (scsw_is_tm(&irb->scsw))
4380                 dasd_eckd_dump_sense_tcw(device, req, irb);
4381         else
4382                 dasd_eckd_dump_sense_ccw(device, req, irb);
4383 }
4384 
4385 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4386 {
4387         /*
4388          * the device should be disconnected from our LCU structure
4389          * on restore we will reconnect it and reread LCU specific
4390          * information like PAV support that might have changed
4391          */
4392         dasd_alias_remove_device(device);
4393         dasd_alias_disconnect_device_from_lcu(device);
4394 
4395         return 0;
4396 }
4397 
4398 static int dasd_eckd_restore_device(struct dasd_device *device)
4399 {
4400         struct dasd_eckd_private *private;
4401         struct dasd_eckd_characteristics temp_rdc_data;
4402         int rc;
4403         struct dasd_uid temp_uid;
4404         unsigned long flags;
4405         unsigned long cqr_flags = 0;
4406 
4407         private = (struct dasd_eckd_private *) device->private;
4408 
4409         /* Read Configuration Data */
4410         dasd_eckd_read_conf(device);
4411 
4412         dasd_eckd_get_uid(device, &temp_uid);
4413         /* Generate device unique id */
4414         rc = dasd_eckd_generate_uid(device);
4415         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4416         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4417                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4418                         "changed\n");
4419         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4420         if (rc)
4421                 goto out_err;
4422 
4423         /* register lcu with alias handling, enable PAV if this is a new lcu */
4424         rc = dasd_alias_make_device_known_to_lcu(device);
4425         if (rc)
4426                 return rc;
4427 
4428         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4429         dasd_eckd_validate_server(device, cqr_flags);
4430 
4431         /* RE-Read Configuration Data */
4432         dasd_eckd_read_conf(device);
4433 
4434         /* Read Feature Codes */
4435         dasd_eckd_read_features(device);
4436 
4437         /* Read Device Characteristics */
4438         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4439                                          &temp_rdc_data, 64);
4440         if (rc) {
4441                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4442                                 "Read device characteristic failed, rc=%d", rc);
4443                 goto out_err;
4444         }
4445         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4446         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4447         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4448 
4449         /* add device to alias management */
4450         dasd_alias_add_device(device);
4451 
4452         return 0;
4453 
4454 out_err:
4455         return -1;
4456 }
4457 
4458 static int dasd_eckd_reload_device(struct dasd_device *device)
4459 {
4460         struct dasd_eckd_private *private;
4461         int rc, old_base;
4462         char print_uid[60];
4463         struct dasd_uid uid;
4464         unsigned long flags;
4465 
4466         private = (struct dasd_eckd_private *) device->private;
4467 
4468         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4469         old_base = private->uid.base_unit_addr;
4470         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4471 
4472         /* Read Configuration Data */
4473         rc = dasd_eckd_read_conf(device);
4474         if (rc)
4475                 goto out_err;
4476 
4477         rc = dasd_eckd_generate_uid(device);
4478         if (rc)
4479                 goto out_err;
4480         /*
4481          * update unit address configuration and
4482          * add device to alias management
4483          */
4484         dasd_alias_update_add_device(device);
4485 
4486         dasd_eckd_get_uid(device, &uid);
4487 
4488         if (old_base != uid.base_unit_addr) {
4489                 if (strlen(uid.vduit) > 0)
4490                         snprintf(print_uid, sizeof(print_uid),
4491                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4492                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4493                 else
4494                         snprintf(print_uid, sizeof(print_uid),
4495                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4496                                  uid.ssid, uid.base_unit_addr);
4497 
4498                 dev_info(&device->cdev->dev,
4499                          "An Alias device was reassigned to a new base device "
4500                          "with UID: %s\n", print_uid);
4501         }
4502         return 0;
4503 
4504 out_err:
4505         return -1;
4506 }
4507 
4508 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
4509                                          struct dasd_rssd_messages *messages,
4510                                          __u8 lpum)
4511 {
4512         struct dasd_rssd_messages *message_buf;
4513         struct dasd_psf_prssd_data *prssdp;
4514         struct dasd_eckd_private *private;
4515         struct dasd_ccw_req *cqr;
4516         struct ccw1 *ccw;
4517         int rc;
4518 
4519         private = (struct dasd_eckd_private *) device->private;
4520         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4521                                    (sizeof(struct dasd_psf_prssd_data) +
4522                                     sizeof(struct dasd_rssd_messages)),
4523                                    device);
4524         if (IS_ERR(cqr)) {
4525                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
4526                                 "Could not allocate read message buffer request");
4527                 return PTR_ERR(cqr);
4528         }
4529 
4530         cqr->startdev = device;
4531         cqr->memdev = device;
4532         cqr->block = NULL;
4533         cqr->retries = 256;
4534         cqr->expires = 10 * HZ;
4535 
4536         /* we need to check for messages on exactly this path */
4537         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4538         cqr->lpm = lpum;
4539 
4540         /* Prepare for Read Subsystem Data */
4541         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4542         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4543         prssdp->order = PSF_ORDER_PRSSD;
4544         prssdp->suborder = 0x03;        /* Message Buffer */
4545         /* all other bytes of prssdp must be zero */
4546 
4547         ccw = cqr->cpaddr;
4548         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4549         ccw->count = sizeof(struct dasd_psf_prssd_data);
4550         ccw->flags |= CCW_FLAG_CC;
4551         ccw->flags |= CCW_FLAG_SLI;
4552         ccw->cda = (__u32)(addr_t) prssdp;
4553 
4554         /* Read Subsystem Data - message buffer */
4555         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
4556         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
4557 
4558         ccw++;
4559         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4560         ccw->count = sizeof(struct dasd_rssd_messages);
4561         ccw->flags |= CCW_FLAG_SLI;
4562         ccw->cda = (__u32)(addr_t) message_buf;
4563 
4564         cqr->buildclk = get_tod_clock();
4565         cqr->status = DASD_CQR_FILLED;
4566         rc = dasd_sleep_on_immediatly(cqr);
4567         if (rc == 0) {
4568                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4569                 message_buf = (struct dasd_rssd_messages *)
4570                         (prssdp + 1);
4571                 memcpy(messages, message_buf,
4572                        sizeof(struct dasd_rssd_messages));
4573         } else
4574                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4575                                 "Reading messages failed with rc=%d\n"
4576                                 , rc);
4577         dasd_sfree_request(cqr, cqr->memdev);
4578         return rc;
4579 }
4580 
4581 /*
4582  * Perform Subsystem Function - CUIR response
4583  */
4584 static int
4585 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
4586                             __u32 message_id,
4587                             struct channel_path_desc *desc,
4588                             struct subchannel_id sch_id)
4589 {
4590         struct dasd_psf_cuir_response *psf_cuir;
4591         struct dasd_ccw_req *cqr;
4592         struct ccw1 *ccw;
4593         int rc;
4594 
4595         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
4596                                   sizeof(struct dasd_psf_cuir_response),
4597                                   device);
4598 
4599         if (IS_ERR(cqr)) {
4600                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4601                            "Could not allocate PSF-CUIR request");
4602                 return PTR_ERR(cqr);
4603         }
4604 
4605         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
4606         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
4607         psf_cuir->cc = response;
4608         if (desc)
4609                 psf_cuir->chpid = desc->chpid;
4610         psf_cuir->message_id = message_id;
4611         psf_cuir->cssid = sch_id.cssid;
4612         psf_cuir->ssid = sch_id.ssid;
4613 
4614         ccw = cqr->cpaddr;
4615         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4616         ccw->cda = (__u32)(addr_t)psf_cuir;
4617         ccw->count = sizeof(struct dasd_psf_cuir_response);
4618 
4619         cqr->startdev = device;
4620         cqr->memdev = device;
4621         cqr->block = NULL;
4622         cqr->retries = 256;
4623         cqr->expires = 10*HZ;
4624         cqr->buildclk = get_tod_clock();
4625         cqr->status = DASD_CQR_FILLED;
4626 
4627         rc = dasd_sleep_on(cqr);
4628 
4629         dasd_sfree_request(cqr, cqr->memdev);
4630         return rc;
4631 }
4632 
4633 static int dasd_eckd_cuir_change_state(struct dasd_device *device, __u8 lpum)
4634 {
4635         unsigned long flags;
4636         __u8 tbcpm;
4637 
4638         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4639         tbcpm = device->path_data.opm & ~lpum;
4640         if (tbcpm) {
4641                 device->path_data.opm = tbcpm;
4642                 device->path_data.cuirpm |= lpum;
4643         }
4644         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4645         return tbcpm ? 0 : PSF_CUIR_LAST_PATH;
4646 }
4647 
4648 /*
4649  * walk through all devices and quiesce them
4650  * if it is the last path return error
4651  *
4652  * if only part of the devices are quiesced and an error
4653  * occurs no onlining necessary, the storage server will
4654  * notify the already set offline devices again
4655  */
4656 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
4657                                  struct channel_path_desc *desc,
4658                                  struct subchannel_id sch_id)
4659 {
4660         struct alias_pav_group *pavgroup, *tempgroup;
4661         struct dasd_eckd_private *private;
4662         struct dasd_device *dev, *n;
4663         int rc;
4664 
4665         private = (struct dasd_eckd_private *) device->private;
4666         rc = 0;
4667 
4668         /* active devices */
4669         list_for_each_entry_safe(dev, n,
4670                                  &private->lcu->active_devices,
4671                                  alias_list) {
4672                 rc = dasd_eckd_cuir_change_state(dev, lpum);
4673                 if (rc)
4674                         goto out;
4675         }
4676 
4677         /* inactive devices */
4678         list_for_each_entry_safe(dev, n,
4679                                  &private->lcu->inactive_devices,
4680                                  alias_list) {
4681                 rc = dasd_eckd_cuir_change_state(dev, lpum);
4682                 if (rc)
4683                         goto out;
4684         }
4685 
4686         /* devices in PAV groups */
4687         list_for_each_entry_safe(pavgroup, tempgroup,
4688                                  &private->lcu->grouplist, group) {
4689                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
4690                                          alias_list) {
4691                         rc = dasd_eckd_cuir_change_state(dev, lpum);
4692                         if (rc)
4693                                 goto out;
4694                 }
4695                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
4696                                          alias_list) {
4697                         rc = dasd_eckd_cuir_change_state(dev, lpum);
4698                         if (rc)
4699                                 goto out;
4700                 }
4701         }
4702 
4703         pr_warn("Service on the storage server caused path %x.%02x to go offline",
4704                 sch_id.cssid, desc ? desc->chpid : 0);
4705         rc = PSF_CUIR_COMPLETED;
4706 out:
4707         return rc;
4708 }
4709 
4710 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
4711                                  struct channel_path_desc *desc,
4712                                  struct subchannel_id sch_id)
4713 {
4714         struct alias_pav_group *pavgroup, *tempgroup;
4715         struct dasd_eckd_private *private;
4716         struct dasd_device *dev, *n;
4717 
4718         pr_info("Path %x.%02x is back online after service on the storage server",
4719                 sch_id.cssid, desc ? desc->chpid : 0);
4720         private = (struct dasd_eckd_private *) device->private;
4721 
4722         /*
4723          * the path may have been added through a generic path event before
4724          * only trigger path verification if the path is not already in use
4725          */
4726 
4727         list_for_each_entry_safe(dev, n,
4728                                  &private->lcu->active_devices,
4729                                  alias_list) {
4730                 if (!(dev->path_data.opm & lpum)) {
4731                         dev->path_data.tbvpm |= lpum;
4732                         dasd_schedule_device_bh(dev);
4733                 }
4734         }
4735 
4736         list_for_each_entry_safe(dev, n,
4737                                  &private->lcu->inactive_devices,
4738                                  alias_list) {
4739                 if (!(dev->path_data.opm & lpum)) {
4740                         dev->path_data.tbvpm |= lpum;
4741                         dasd_schedule_device_bh(dev);
4742                 }
4743         }
4744 
4745         /* devices in PAV groups */
4746         list_for_each_entry_safe(pavgroup, tempgroup,
4747                                  &private->lcu->grouplist,
4748                                  group) {
4749                 list_for_each_entry_safe(dev, n,
4750                                          &pavgroup->baselist,
4751                                          alias_list) {
4752                         if (!(dev->path_data.opm & lpum)) {
4753                                 dev->path_data.tbvpm |= lpum;
4754                                 dasd_schedule_device_bh(dev);
4755                         }
4756                 }
4757                 list_for_each_entry_safe(dev, n,
4758                                          &pavgroup->aliaslist,
4759                                          alias_list) {
4760                         if (!(dev->path_data.opm & lpum)) {
4761                                 dev->path_data.tbvpm |= lpum;
4762                                 dasd_schedule_device_bh(dev);
4763                         }
4764                 }
4765         }
4766         return PSF_CUIR_COMPLETED;
4767 }
4768 
4769 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
4770                                  __u8 lpum)
4771 {
4772         struct dasd_cuir_message *cuir = messages;
4773         struct channel_path_desc *desc;
4774         struct subchannel_id sch_id;
4775         int pos, response;
4776         ccw_device_get_schid(device->cdev, &sch_id);
4777 
4778         /* get position of path in mask */
4779         pos = 8 - ffs(lpum);
4780         /* get channel path descriptor from this position */
4781         desc = ccw_device_get_chp_desc(device->cdev, pos);
4782 
4783         if (cuir->code == CUIR_QUIESCE) {
4784                 /* quiesce */
4785                 response = dasd_eckd_cuir_quiesce(device, lpum, desc, sch_id);
4786         } else if (cuir->code == CUIR_RESUME) {
4787                 /* resume */
4788                 response = dasd_eckd_cuir_resume(device, lpum, desc, sch_id);
4789         } else
4790                 response = PSF_CUIR_NOT_SUPPORTED;
4791 
4792         dasd_eckd_psf_cuir_response(device, response, cuir->message_id,
4793                                     desc, sch_id);
4794 
4795         /* free descriptor copy */
4796         kfree(desc);
4797 }
4798 
4799 static void dasd_eckd_check_attention_work(struct work_struct *work)
4800 {
4801         struct check_attention_work_data *data;
4802         struct dasd_rssd_messages *messages;
4803         struct dasd_device *device;
4804         int rc;
4805 
4806         data = container_of(work, struct check_attention_work_data, worker);
4807         device = data->device;
4808 
4809         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
4810         if (!messages) {
4811                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4812                               "Could not allocate attention message buffer");
4813                 goto out;
4814         }
4815 
4816         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
4817         if (rc)
4818                 goto out;
4819 
4820         if (messages->length == ATTENTION_LENGTH_CUIR &&
4821             messages->format == ATTENTION_FORMAT_CUIR)
4822                 dasd_eckd_handle_cuir(device, messages, data->lpum);
4823 
4824 out:
4825         dasd_put_device(device);
4826         kfree(messages);
4827         kfree(data);
4828 }
4829 
4830 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
4831 {
4832         struct check_attention_work_data *data;
4833 
4834         data = kzalloc(sizeof(*data), GFP_ATOMIC);
4835         if (!data)
4836                 return -ENOMEM;
4837         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
4838         dasd_get_device(device);
4839         data->device = device;
4840         data->lpum = lpum;
4841         schedule_work(&data->worker);
4842         return 0;
4843 }
4844 
4845 static struct ccw_driver dasd_eckd_driver = {
4846         .driver = {
4847                 .name   = "dasd-eckd",
4848                 .owner  = THIS_MODULE,
4849         },
4850         .ids         = dasd_eckd_ids,
4851         .probe       = dasd_eckd_probe,
4852         .remove      = dasd_generic_remove,
4853         .set_offline = dasd_generic_set_offline,
4854         .set_online  = dasd_eckd_set_online,
4855         .notify      = dasd_generic_notify,
4856         .path_event  = dasd_generic_path_event,
4857         .shutdown    = dasd_generic_shutdown,
4858         .freeze      = dasd_generic_pm_freeze,
4859         .thaw        = dasd_generic_restore_device,
4860         .restore     = dasd_generic_restore_device,
4861         .uc_handler  = dasd_generic_uc_handler,
4862         .int_class   = IRQIO_DAS,
4863 };
4864 
4865 /*
4866  * max_blocks is dependent on the amount of storage that is available
4867  * in the static io buffer for each device. Currently each device has
4868  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4869  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4870  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4871  * addition we have one define extent ccw + 16 bytes of data and one
4872  * locate record ccw + 16 bytes of data. That makes:
4873  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4874  * We want to fit two into the available memory so that we can immediately
4875  * start the next request if one finishes off. That makes 249.5 blocks
4876  * for one request. Give a little safety and the result is 240.
4877  */
4878 static struct dasd_discipline dasd_eckd_discipline = {
4879         .owner = THIS_MODULE,
4880         .name = "ECKD",
4881         .ebcname = "ECKD",
4882         .max_blocks = 190,
4883         .check_device = dasd_eckd_check_characteristics,
4884         .uncheck_device = dasd_eckd_uncheck_device,
4885         .do_analysis = dasd_eckd_do_analysis,
4886         .verify_path = dasd_eckd_verify_path,
4887         .basic_to_ready = dasd_eckd_basic_to_ready,
4888         .online_to_ready = dasd_eckd_online_to_ready,
4889         .basic_to_known = dasd_eckd_basic_to_known,
4890         .fill_geometry = dasd_eckd_fill_geometry,
4891         .start_IO = dasd_start_IO,
4892         .term_IO = dasd_term_IO,
4893         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4894         .format_device = dasd_eckd_format_device,
4895         .erp_action = dasd_eckd_erp_action,
4896         .erp_postaction = dasd_eckd_erp_postaction,
4897         .check_for_device_change = dasd_eckd_check_for_device_change,
4898         .build_cp = dasd_eckd_build_alias_cp,
4899         .free_cp = dasd_eckd_free_alias_cp,
4900         .dump_sense = dasd_eckd_dump_sense,
4901         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4902         .fill_info = dasd_eckd_fill_info,
4903         .ioctl = dasd_eckd_ioctl,
4904         .freeze = dasd_eckd_pm_freeze,
4905         .restore = dasd_eckd_restore_device,
4906         .reload = dasd_eckd_reload_device,
4907         .get_uid = dasd_eckd_get_uid,
4908         .kick_validate = dasd_eckd_kick_validate_server,
4909         .check_attention = dasd_eckd_check_attention,
4910 };
4911 
4912 static int __init
4913 dasd_eckd_init(void)
4914 {
4915         int ret;
4916 
4917         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4918         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4919                                    GFP_KERNEL | GFP_DMA);
4920         if (!dasd_reserve_req)
4921                 return -ENOMEM;
4922         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4923                                    GFP_KERNEL | GFP_DMA);
4924         if (!path_verification_worker) {
4925                 kfree(dasd_reserve_req);
4926                 return -ENOMEM;
4927         }
4928         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
4929         if (!rawpadpage) {
4930                 kfree(path_verification_worker);
4931                 kfree(dasd_reserve_req);
4932                 return -ENOMEM;
4933         }
4934         ret = ccw_driver_register(&dasd_eckd_driver);
4935         if (!ret)
4936                 wait_for_device_probe();
4937         else {
4938                 kfree(path_verification_worker);
4939                 kfree(dasd_reserve_req);
4940                 free_page((unsigned long)rawpadpage);
4941         }
4942         return ret;
4943 }
4944 
4945 static void __exit
4946 dasd_eckd_cleanup(void)
4947 {
4948         ccw_driver_unregister(&dasd_eckd_driver);
4949         kfree(path_verification_worker);
4950         kfree(dasd_reserve_req);
4951         free_page((unsigned long)rawpadpage);
4952 }
4953 
4954 module_init(dasd_eckd_init);
4955 module_exit(dasd_eckd_cleanup);
4956 

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