Version:  2.0.40 2.2.26 2.4.37 3.1 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

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 
 33 #include "dasd_int.h"
 34 #include "dasd_eckd.h"
 35 
 36 #ifdef PRINTK_HEADER
 37 #undef PRINTK_HEADER
 38 #endif                          /* PRINTK_HEADER */
 39 #define PRINTK_HEADER "dasd(eckd):"
 40 
 41 #define ECKD_C0(i) (i->home_bytes)
 42 #define ECKD_F(i) (i->formula)
 43 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
 44                     (i->factors.f_0x02.f1))
 45 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
 46                     (i->factors.f_0x02.f2))
 47 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
 48                     (i->factors.f_0x02.f3))
 49 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
 50 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
 51 #define ECKD_F6(i) (i->factor6)
 52 #define ECKD_F7(i) (i->factor7)
 53 #define ECKD_F8(i) (i->factor8)
 54 
 55 /*
 56  * raw track access always map to 64k in memory
 57  * so it maps to 16 blocks of 4k per track
 58  */
 59 #define DASD_RAW_BLOCK_PER_TRACK 16
 60 #define DASD_RAW_BLOCKSIZE 4096
 61 /* 64k are 128 x 512 byte sectors  */
 62 #define DASD_RAW_SECTORS_PER_TRACK 128
 63 
 64 MODULE_LICENSE("GPL");
 65 
 66 static struct dasd_discipline dasd_eckd_discipline;
 67 
 68 /* The ccw bus type uses this table to find devices that it sends to
 69  * dasd_eckd_probe */
 70 static struct ccw_device_id dasd_eckd_ids[] = {
 71         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
 72         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
 73         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
 74         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
 75         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
 76         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
 77         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
 78         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
 79         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
 80         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
 81         { /* end of list */ },
 82 };
 83 
 84 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
 85 
 86 static struct ccw_driver dasd_eckd_driver; /* see below */
 87 
 88 static void *rawpadpage;
 89 
 90 #define INIT_CQR_OK 0
 91 #define INIT_CQR_UNFORMATTED 1
 92 #define INIT_CQR_ERROR 2
 93 
 94 /* emergency request for reserve/release */
 95 static struct {
 96         struct dasd_ccw_req cqr;
 97         struct ccw1 ccw;
 98         char data[32];
 99 } *dasd_reserve_req;
100 static DEFINE_MUTEX(dasd_reserve_mutex);
101 
102 /* definitions for the path verification worker */
103 struct path_verification_work_data {
104         struct work_struct worker;
105         struct dasd_device *device;
106         struct dasd_ccw_req cqr;
107         struct ccw1 ccw;
108         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
109         int isglobal;
110         __u8 tbvpm;
111 };
112 static struct path_verification_work_data *path_verification_worker;
113 static DEFINE_MUTEX(dasd_path_verification_mutex);
114 
115 /* initial attempt at a probe function. this can be simplified once
116  * the other detection code is gone */
117 static int
118 dasd_eckd_probe (struct ccw_device *cdev)
119 {
120         int ret;
121 
122         /* set ECKD specific ccw-device options */
123         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
124                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
125         if (ret) {
126                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
127                                 "dasd_eckd_probe: could not set "
128                                 "ccw-device options");
129                 return ret;
130         }
131         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
132         return ret;
133 }
134 
135 static int
136 dasd_eckd_set_online(struct ccw_device *cdev)
137 {
138         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
139 }
140 
141 static const int sizes_trk0[] = { 28, 148, 84 };
142 #define LABEL_SIZE 140
143 
144 /* head and record addresses of count_area read in analysis ccw */
145 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
146 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
147 
148 static inline unsigned int
149 round_up_multiple(unsigned int no, unsigned int mult)
150 {
151         int rem = no % mult;
152         return (rem ? no - rem + mult : no);
153 }
154 
155 static inline unsigned int
156 ceil_quot(unsigned int d1, unsigned int d2)
157 {
158         return (d1 + (d2 - 1)) / d2;
159 }
160 
161 static unsigned int
162 recs_per_track(struct dasd_eckd_characteristics * rdc,
163                unsigned int kl, unsigned int dl)
164 {
165         int dn, kn;
166 
167         switch (rdc->dev_type) {
168         case 0x3380:
169                 if (kl)
170                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
171                                        ceil_quot(dl + 12, 32));
172                 else
173                         return 1499 / (15 + ceil_quot(dl + 12, 32));
174         case 0x3390:
175                 dn = ceil_quot(dl + 6, 232) + 1;
176                 if (kl) {
177                         kn = ceil_quot(kl + 6, 232) + 1;
178                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
179                                        9 + ceil_quot(dl + 6 * dn, 34));
180                 } else
181                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
182         case 0x9345:
183                 dn = ceil_quot(dl + 6, 232) + 1;
184                 if (kl) {
185                         kn = ceil_quot(kl + 6, 232) + 1;
186                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
187                                        ceil_quot(dl + 6 * dn, 34));
188                 } else
189                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
190         }
191         return 0;
192 }
193 
194 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
195 {
196         geo->cyl = (__u16) cyl;
197         geo->head = cyl >> 16;
198         geo->head <<= 4;
199         geo->head |= head;
200 }
201 
202 static int
203 check_XRC (struct ccw1         *de_ccw,
204            struct DE_eckd_data *data,
205            struct dasd_device  *device)
206 {
207         struct dasd_eckd_private *private;
208         int rc;
209 
210         private = (struct dasd_eckd_private *) device->private;
211         if (!private->rdc_data.facilities.XRC_supported)
212                 return 0;
213 
214         /* switch on System Time Stamp - needed for XRC Support */
215         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
216         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
217 
218         rc = get_sync_clock(&data->ep_sys_time);
219         /* Ignore return code if sync clock is switched off. */
220         if (rc == -EOPNOTSUPP || rc == -EACCES)
221                 rc = 0;
222 
223         de_ccw->count = sizeof(struct DE_eckd_data);
224         de_ccw->flags |= CCW_FLAG_SLI;
225         return rc;
226 }
227 
228 static int
229 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
230               unsigned int totrk, int cmd, struct dasd_device *device)
231 {
232         struct dasd_eckd_private *private;
233         u32 begcyl, endcyl;
234         u16 heads, beghead, endhead;
235         int rc = 0;
236 
237         private = (struct dasd_eckd_private *) device->private;
238 
239         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
240         ccw->flags = 0;
241         ccw->count = 16;
242         ccw->cda = (__u32) __pa(data);
243 
244         memset(data, 0, sizeof(struct DE_eckd_data));
245         switch (cmd) {
246         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
247         case DASD_ECKD_CCW_READ_RECORD_ZERO:
248         case DASD_ECKD_CCW_READ:
249         case DASD_ECKD_CCW_READ_MT:
250         case DASD_ECKD_CCW_READ_CKD:
251         case DASD_ECKD_CCW_READ_CKD_MT:
252         case DASD_ECKD_CCW_READ_KD:
253         case DASD_ECKD_CCW_READ_KD_MT:
254         case DASD_ECKD_CCW_READ_COUNT:
255                 data->mask.perm = 0x1;
256                 data->attributes.operation = private->attrib.operation;
257                 break;
258         case DASD_ECKD_CCW_WRITE:
259         case DASD_ECKD_CCW_WRITE_MT:
260         case DASD_ECKD_CCW_WRITE_KD:
261         case DASD_ECKD_CCW_WRITE_KD_MT:
262                 data->mask.perm = 0x02;
263                 data->attributes.operation = private->attrib.operation;
264                 rc = check_XRC (ccw, data, device);
265                 break;
266         case DASD_ECKD_CCW_WRITE_CKD:
267         case DASD_ECKD_CCW_WRITE_CKD_MT:
268                 data->attributes.operation = DASD_BYPASS_CACHE;
269                 rc = check_XRC (ccw, data, device);
270                 break;
271         case DASD_ECKD_CCW_ERASE:
272         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
273         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
274                 data->mask.perm = 0x3;
275                 data->mask.auth = 0x1;
276                 data->attributes.operation = DASD_BYPASS_CACHE;
277                 rc = check_XRC (ccw, data, device);
278                 break;
279         default:
280                 dev_err(&device->cdev->dev,
281                         "0x%x is not a known command\n", cmd);
282                 break;
283         }
284 
285         data->attributes.mode = 0x3;    /* ECKD */
286 
287         if ((private->rdc_data.cu_type == 0x2105 ||
288              private->rdc_data.cu_type == 0x2107 ||
289              private->rdc_data.cu_type == 0x1750)
290             && !(private->uses_cdl && trk < 2))
291                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
292 
293         heads = private->rdc_data.trk_per_cyl;
294         begcyl = trk / heads;
295         beghead = trk % heads;
296         endcyl = totrk / heads;
297         endhead = totrk % heads;
298 
299         /* check for sequential prestage - enhance cylinder range */
300         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
301             data->attributes.operation == DASD_SEQ_ACCESS) {
302 
303                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
304                         endcyl += private->attrib.nr_cyl;
305                 else
306                         endcyl = (private->real_cyl - 1);
307         }
308 
309         set_ch_t(&data->beg_ext, begcyl, beghead);
310         set_ch_t(&data->end_ext, endcyl, endhead);
311         return rc;
312 }
313 
314 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
315                                struct dasd_device  *device)
316 {
317         struct dasd_eckd_private *private;
318         int rc;
319 
320         private = (struct dasd_eckd_private *) device->private;
321         if (!private->rdc_data.facilities.XRC_supported)
322                 return 0;
323 
324         /* switch on System Time Stamp - needed for XRC Support */
325         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
326         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
327         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
328 
329         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
330         /* Ignore return code if sync clock is switched off. */
331         if (rc == -EOPNOTSUPP || rc == -EACCES)
332                 rc = 0;
333         return rc;
334 }
335 
336 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
337                           unsigned int rec_on_trk, int count, int cmd,
338                           struct dasd_device *device, unsigned int reclen,
339                           unsigned int tlf)
340 {
341         struct dasd_eckd_private *private;
342         int sector;
343         int dn, d;
344 
345         private = (struct dasd_eckd_private *) device->private;
346 
347         memset(data, 0, sizeof(*data));
348         sector = 0;
349         if (rec_on_trk) {
350                 switch (private->rdc_data.dev_type) {
351                 case 0x3390:
352                         dn = ceil_quot(reclen + 6, 232);
353                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
354                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
355                         break;
356                 case 0x3380:
357                         d = 7 + ceil_quot(reclen + 12, 32);
358                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
359                         break;
360                 }
361         }
362         data->sector = sector;
363         /* note: meaning of count depends on the operation
364          *       for record based I/O it's the number of records, but for
365          *       track based I/O it's the number of tracks
366          */
367         data->count = count;
368         switch (cmd) {
369         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
370                 data->operation.orientation = 0x3;
371                 data->operation.operation = 0x03;
372                 break;
373         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
374                 data->operation.orientation = 0x3;
375                 data->operation.operation = 0x16;
376                 break;
377         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
378                 data->operation.orientation = 0x1;
379                 data->operation.operation = 0x03;
380                 data->count++;
381                 break;
382         case DASD_ECKD_CCW_READ_RECORD_ZERO:
383                 data->operation.orientation = 0x3;
384                 data->operation.operation = 0x16;
385                 data->count++;
386                 break;
387         case DASD_ECKD_CCW_WRITE:
388         case DASD_ECKD_CCW_WRITE_MT:
389         case DASD_ECKD_CCW_WRITE_KD:
390         case DASD_ECKD_CCW_WRITE_KD_MT:
391                 data->auxiliary.length_valid = 0x1;
392                 data->length = reclen;
393                 data->operation.operation = 0x01;
394                 break;
395         case DASD_ECKD_CCW_WRITE_CKD:
396         case DASD_ECKD_CCW_WRITE_CKD_MT:
397                 data->auxiliary.length_valid = 0x1;
398                 data->length = reclen;
399                 data->operation.operation = 0x03;
400                 break;
401         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
402                 data->operation.orientation = 0x0;
403                 data->operation.operation = 0x3F;
404                 data->extended_operation = 0x11;
405                 data->length = 0;
406                 data->extended_parameter_length = 0x02;
407                 if (data->count > 8) {
408                         data->extended_parameter[0] = 0xFF;
409                         data->extended_parameter[1] = 0xFF;
410                         data->extended_parameter[1] <<= (16 - count);
411                 } else {
412                         data->extended_parameter[0] = 0xFF;
413                         data->extended_parameter[0] <<= (8 - count);
414                         data->extended_parameter[1] = 0x00;
415                 }
416                 data->sector = 0xFF;
417                 break;
418         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
419                 data->auxiliary.length_valid = 0x1;
420                 data->length = reclen;  /* not tlf, as one might think */
421                 data->operation.operation = 0x3F;
422                 data->extended_operation = 0x23;
423                 break;
424         case DASD_ECKD_CCW_READ:
425         case DASD_ECKD_CCW_READ_MT:
426         case DASD_ECKD_CCW_READ_KD:
427         case DASD_ECKD_CCW_READ_KD_MT:
428                 data->auxiliary.length_valid = 0x1;
429                 data->length = reclen;
430                 data->operation.operation = 0x06;
431                 break;
432         case DASD_ECKD_CCW_READ_CKD:
433         case DASD_ECKD_CCW_READ_CKD_MT:
434                 data->auxiliary.length_valid = 0x1;
435                 data->length = reclen;
436                 data->operation.operation = 0x16;
437                 break;
438         case DASD_ECKD_CCW_READ_COUNT:
439                 data->operation.operation = 0x06;
440                 break;
441         case DASD_ECKD_CCW_READ_TRACK:
442                 data->operation.orientation = 0x1;
443                 data->operation.operation = 0x0C;
444                 data->extended_parameter_length = 0;
445                 data->sector = 0xFF;
446                 break;
447         case DASD_ECKD_CCW_READ_TRACK_DATA:
448                 data->auxiliary.length_valid = 0x1;
449                 data->length = tlf;
450                 data->operation.operation = 0x0C;
451                 break;
452         case DASD_ECKD_CCW_ERASE:
453                 data->length = reclen;
454                 data->auxiliary.length_valid = 0x1;
455                 data->operation.operation = 0x0b;
456                 break;
457         default:
458                 DBF_DEV_EVENT(DBF_ERR, device,
459                             "fill LRE unknown opcode 0x%x", cmd);
460                 BUG();
461         }
462         set_ch_t(&data->seek_addr,
463                  trk / private->rdc_data.trk_per_cyl,
464                  trk % private->rdc_data.trk_per_cyl);
465         data->search_arg.cyl = data->seek_addr.cyl;
466         data->search_arg.head = data->seek_addr.head;
467         data->search_arg.record = rec_on_trk;
468 }
469 
470 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
471                       unsigned int trk, unsigned int totrk, int cmd,
472                       struct dasd_device *basedev, struct dasd_device *startdev,
473                       unsigned char format, unsigned int rec_on_trk, int count,
474                       unsigned int blksize, unsigned int tlf)
475 {
476         struct dasd_eckd_private *basepriv, *startpriv;
477         struct DE_eckd_data *dedata;
478         struct LRE_eckd_data *lredata;
479         u32 begcyl, endcyl;
480         u16 heads, beghead, endhead;
481         int rc = 0;
482 
483         basepriv = (struct dasd_eckd_private *) basedev->private;
484         startpriv = (struct dasd_eckd_private *) startdev->private;
485         dedata = &pfxdata->define_extent;
486         lredata = &pfxdata->locate_record;
487 
488         ccw->cmd_code = DASD_ECKD_CCW_PFX;
489         ccw->flags = 0;
490         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
491                 ccw->count = sizeof(*pfxdata) + 2;
492                 ccw->cda = (__u32) __pa(pfxdata);
493                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
494         } else {
495                 ccw->count = sizeof(*pfxdata);
496                 ccw->cda = (__u32) __pa(pfxdata);
497                 memset(pfxdata, 0, sizeof(*pfxdata));
498         }
499 
500         /* prefix data */
501         if (format > 1) {
502                 DBF_DEV_EVENT(DBF_ERR, basedev,
503                               "PFX LRE unknown format 0x%x", format);
504                 BUG();
505                 return -EINVAL;
506         }
507         pfxdata->format = format;
508         pfxdata->base_address = basepriv->ned->unit_addr;
509         pfxdata->base_lss = basepriv->ned->ID;
510         pfxdata->validity.define_extent = 1;
511 
512         /* private uid is kept up to date, conf_data may be outdated */
513         if (startpriv->uid.type != UA_BASE_DEVICE) {
514                 pfxdata->validity.verify_base = 1;
515                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
516                         pfxdata->validity.hyper_pav = 1;
517         }
518 
519         /* define extend data (mostly)*/
520         switch (cmd) {
521         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
522         case DASD_ECKD_CCW_READ_RECORD_ZERO:
523         case DASD_ECKD_CCW_READ:
524         case DASD_ECKD_CCW_READ_MT:
525         case DASD_ECKD_CCW_READ_CKD:
526         case DASD_ECKD_CCW_READ_CKD_MT:
527         case DASD_ECKD_CCW_READ_KD:
528         case DASD_ECKD_CCW_READ_KD_MT:
529         case DASD_ECKD_CCW_READ_COUNT:
530                 dedata->mask.perm = 0x1;
531                 dedata->attributes.operation = basepriv->attrib.operation;
532                 break;
533         case DASD_ECKD_CCW_READ_TRACK:
534         case DASD_ECKD_CCW_READ_TRACK_DATA:
535                 dedata->mask.perm = 0x1;
536                 dedata->attributes.operation = basepriv->attrib.operation;
537                 dedata->blk_size = 0;
538                 break;
539         case DASD_ECKD_CCW_WRITE:
540         case DASD_ECKD_CCW_WRITE_MT:
541         case DASD_ECKD_CCW_WRITE_KD:
542         case DASD_ECKD_CCW_WRITE_KD_MT:
543                 dedata->mask.perm = 0x02;
544                 dedata->attributes.operation = basepriv->attrib.operation;
545                 rc = check_XRC_on_prefix(pfxdata, basedev);
546                 break;
547         case DASD_ECKD_CCW_WRITE_CKD:
548         case DASD_ECKD_CCW_WRITE_CKD_MT:
549                 dedata->attributes.operation = DASD_BYPASS_CACHE;
550                 rc = check_XRC_on_prefix(pfxdata, basedev);
551                 break;
552         case DASD_ECKD_CCW_ERASE:
553         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
554         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
555                 dedata->mask.perm = 0x3;
556                 dedata->mask.auth = 0x1;
557                 dedata->attributes.operation = DASD_BYPASS_CACHE;
558                 rc = check_XRC_on_prefix(pfxdata, basedev);
559                 break;
560         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
561                 dedata->mask.perm = 0x03;
562                 dedata->attributes.operation = basepriv->attrib.operation;
563                 dedata->blk_size = 0;
564                 break;
565         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
566                 dedata->mask.perm = 0x02;
567                 dedata->attributes.operation = basepriv->attrib.operation;
568                 dedata->blk_size = blksize;
569                 rc = check_XRC_on_prefix(pfxdata, basedev);
570                 break;
571         default:
572                 DBF_DEV_EVENT(DBF_ERR, basedev,
573                             "PFX LRE unknown opcode 0x%x", cmd);
574                 BUG();
575                 return -EINVAL;
576         }
577 
578         dedata->attributes.mode = 0x3;  /* ECKD */
579 
580         if ((basepriv->rdc_data.cu_type == 0x2105 ||
581              basepriv->rdc_data.cu_type == 0x2107 ||
582              basepriv->rdc_data.cu_type == 0x1750)
583             && !(basepriv->uses_cdl && trk < 2))
584                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
585 
586         heads = basepriv->rdc_data.trk_per_cyl;
587         begcyl = trk / heads;
588         beghead = trk % heads;
589         endcyl = totrk / heads;
590         endhead = totrk % heads;
591 
592         /* check for sequential prestage - enhance cylinder range */
593         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
594             dedata->attributes.operation == DASD_SEQ_ACCESS) {
595 
596                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
597                         endcyl += basepriv->attrib.nr_cyl;
598                 else
599                         endcyl = (basepriv->real_cyl - 1);
600         }
601 
602         set_ch_t(&dedata->beg_ext, begcyl, beghead);
603         set_ch_t(&dedata->end_ext, endcyl, endhead);
604 
605         if (format == 1) {
606                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
607                               basedev, blksize, tlf);
608         }
609 
610         return rc;
611 }
612 
613 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
614                   unsigned int trk, unsigned int totrk, int cmd,
615                   struct dasd_device *basedev, struct dasd_device *startdev)
616 {
617         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
618                           0, 0, 0, 0, 0);
619 }
620 
621 static void
622 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
623               unsigned int rec_on_trk, int no_rec, int cmd,
624               struct dasd_device * device, int reclen)
625 {
626         struct dasd_eckd_private *private;
627         int sector;
628         int dn, d;
629 
630         private = (struct dasd_eckd_private *) device->private;
631 
632         DBF_DEV_EVENT(DBF_INFO, device,
633                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
634                   trk, rec_on_trk, no_rec, cmd, reclen);
635 
636         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
637         ccw->flags = 0;
638         ccw->count = 16;
639         ccw->cda = (__u32) __pa(data);
640 
641         memset(data, 0, sizeof(struct LO_eckd_data));
642         sector = 0;
643         if (rec_on_trk) {
644                 switch (private->rdc_data.dev_type) {
645                 case 0x3390:
646                         dn = ceil_quot(reclen + 6, 232);
647                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
648                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
649                         break;
650                 case 0x3380:
651                         d = 7 + ceil_quot(reclen + 12, 32);
652                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
653                         break;
654                 }
655         }
656         data->sector = sector;
657         data->count = no_rec;
658         switch (cmd) {
659         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
660                 data->operation.orientation = 0x3;
661                 data->operation.operation = 0x03;
662                 break;
663         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
664                 data->operation.orientation = 0x3;
665                 data->operation.operation = 0x16;
666                 break;
667         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
668                 data->operation.orientation = 0x1;
669                 data->operation.operation = 0x03;
670                 data->count++;
671                 break;
672         case DASD_ECKD_CCW_READ_RECORD_ZERO:
673                 data->operation.orientation = 0x3;
674                 data->operation.operation = 0x16;
675                 data->count++;
676                 break;
677         case DASD_ECKD_CCW_WRITE:
678         case DASD_ECKD_CCW_WRITE_MT:
679         case DASD_ECKD_CCW_WRITE_KD:
680         case DASD_ECKD_CCW_WRITE_KD_MT:
681                 data->auxiliary.last_bytes_used = 0x1;
682                 data->length = reclen;
683                 data->operation.operation = 0x01;
684                 break;
685         case DASD_ECKD_CCW_WRITE_CKD:
686         case DASD_ECKD_CCW_WRITE_CKD_MT:
687                 data->auxiliary.last_bytes_used = 0x1;
688                 data->length = reclen;
689                 data->operation.operation = 0x03;
690                 break;
691         case DASD_ECKD_CCW_READ:
692         case DASD_ECKD_CCW_READ_MT:
693         case DASD_ECKD_CCW_READ_KD:
694         case DASD_ECKD_CCW_READ_KD_MT:
695                 data->auxiliary.last_bytes_used = 0x1;
696                 data->length = reclen;
697                 data->operation.operation = 0x06;
698                 break;
699         case DASD_ECKD_CCW_READ_CKD:
700         case DASD_ECKD_CCW_READ_CKD_MT:
701                 data->auxiliary.last_bytes_used = 0x1;
702                 data->length = reclen;
703                 data->operation.operation = 0x16;
704                 break;
705         case DASD_ECKD_CCW_READ_COUNT:
706                 data->operation.operation = 0x06;
707                 break;
708         case DASD_ECKD_CCW_ERASE:
709                 data->length = reclen;
710                 data->auxiliary.last_bytes_used = 0x1;
711                 data->operation.operation = 0x0b;
712                 break;
713         default:
714                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
715                               "opcode 0x%x", cmd);
716         }
717         set_ch_t(&data->seek_addr,
718                  trk / private->rdc_data.trk_per_cyl,
719                  trk % private->rdc_data.trk_per_cyl);
720         data->search_arg.cyl = data->seek_addr.cyl;
721         data->search_arg.head = data->seek_addr.head;
722         data->search_arg.record = rec_on_trk;
723 }
724 
725 /*
726  * Returns 1 if the block is one of the special blocks that needs
727  * to get read/written with the KD variant of the command.
728  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
729  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
730  * Luckily the KD variants differ only by one bit (0x08) from the
731  * normal variant. So don't wonder about code like:
732  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
733  *         ccw->cmd_code |= 0x8;
734  */
735 static inline int
736 dasd_eckd_cdl_special(int blk_per_trk, int recid)
737 {
738         if (recid < 3)
739                 return 1;
740         if (recid < blk_per_trk)
741                 return 0;
742         if (recid < 2 * blk_per_trk)
743                 return 1;
744         return 0;
745 }
746 
747 /*
748  * Returns the record size for the special blocks of the cdl format.
749  * Only returns something useful if dasd_eckd_cdl_special is true
750  * for the recid.
751  */
752 static inline int
753 dasd_eckd_cdl_reclen(int recid)
754 {
755         if (recid < 3)
756                 return sizes_trk0[recid];
757         return LABEL_SIZE;
758 }
759 /* create unique id from private structure. */
760 static void create_uid(struct dasd_eckd_private *private)
761 {
762         int count;
763         struct dasd_uid *uid;
764 
765         uid = &private->uid;
766         memset(uid, 0, sizeof(struct dasd_uid));
767         memcpy(uid->vendor, private->ned->HDA_manufacturer,
768                sizeof(uid->vendor) - 1);
769         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
770         memcpy(uid->serial, private->ned->HDA_location,
771                sizeof(uid->serial) - 1);
772         EBCASC(uid->serial, sizeof(uid->serial) - 1);
773         uid->ssid = private->gneq->subsystemID;
774         uid->real_unit_addr = private->ned->unit_addr;
775         if (private->sneq) {
776                 uid->type = private->sneq->sua_flags;
777                 if (uid->type == UA_BASE_PAV_ALIAS)
778                         uid->base_unit_addr = private->sneq->base_unit_addr;
779         } else {
780                 uid->type = UA_BASE_DEVICE;
781         }
782         if (private->vdsneq) {
783                 for (count = 0; count < 16; count++) {
784                         sprintf(uid->vduit+2*count, "%02x",
785                                 private->vdsneq->uit[count]);
786                 }
787         }
788 }
789 
790 /*
791  * Generate device unique id that specifies the physical device.
792  */
793 static int dasd_eckd_generate_uid(struct dasd_device *device)
794 {
795         struct dasd_eckd_private *private;
796         unsigned long flags;
797 
798         private = (struct dasd_eckd_private *) device->private;
799         if (!private)
800                 return -ENODEV;
801         if (!private->ned || !private->gneq)
802                 return -ENODEV;
803         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
804         create_uid(private);
805         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
806         return 0;
807 }
808 
809 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
810 {
811         struct dasd_eckd_private *private;
812         unsigned long flags;
813 
814         if (device->private) {
815                 private = (struct dasd_eckd_private *)device->private;
816                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
817                 *uid = private->uid;
818                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
819                 return 0;
820         }
821         return -EINVAL;
822 }
823 
824 /*
825  * compare device UID with data of a given dasd_eckd_private structure
826  * return 0 for match
827  */
828 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
829                                       struct dasd_eckd_private *private)
830 {
831         struct dasd_uid device_uid;
832 
833         create_uid(private);
834         dasd_eckd_get_uid(device, &device_uid);
835 
836         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
837 }
838 
839 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
840                                    struct dasd_ccw_req *cqr,
841                                    __u8 *rcd_buffer,
842                                    __u8 lpm)
843 {
844         struct ccw1 *ccw;
845         /*
846          * buffer has to start with EBCDIC "V1.0" to show
847          * support for virtual device SNEQ
848          */
849         rcd_buffer[0] = 0xE5;
850         rcd_buffer[1] = 0xF1;
851         rcd_buffer[2] = 0x4B;
852         rcd_buffer[3] = 0xF0;
853 
854         ccw = cqr->cpaddr;
855         ccw->cmd_code = DASD_ECKD_CCW_RCD;
856         ccw->flags = 0;
857         ccw->cda = (__u32)(addr_t)rcd_buffer;
858         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
859         cqr->magic = DASD_ECKD_MAGIC;
860 
861         cqr->startdev = device;
862         cqr->memdev = device;
863         cqr->block = NULL;
864         cqr->expires = 10*HZ;
865         cqr->lpm = lpm;
866         cqr->retries = 256;
867         cqr->buildclk = get_tod_clock();
868         cqr->status = DASD_CQR_FILLED;
869         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
870 }
871 
872 /*
873  * Wakeup helper for read_conf
874  * if the cqr is not done and needs some error recovery
875  * the buffer has to be re-initialized with the EBCDIC "V1.0"
876  * to show support for virtual device SNEQ
877  */
878 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
879 {
880         struct ccw1 *ccw;
881         __u8 *rcd_buffer;
882 
883         if (cqr->status !=  DASD_CQR_DONE) {
884                 ccw = cqr->cpaddr;
885                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
886                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
887 
888                 rcd_buffer[0] = 0xE5;
889                 rcd_buffer[1] = 0xF1;
890                 rcd_buffer[2] = 0x4B;
891                 rcd_buffer[3] = 0xF0;
892         }
893         dasd_wakeup_cb(cqr, data);
894 }
895 
896 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
897                                            struct dasd_ccw_req *cqr,
898                                            __u8 *rcd_buffer,
899                                            __u8 lpm)
900 {
901         struct ciw *ciw;
902         int rc;
903         /*
904          * sanity check: scan for RCD command in extended SenseID data
905          * some devices do not support RCD
906          */
907         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
908         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
909                 return -EOPNOTSUPP;
910 
911         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
912         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
913         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
914         cqr->retries = 5;
915         cqr->callback = read_conf_cb;
916         rc = dasd_sleep_on_immediatly(cqr);
917         return rc;
918 }
919 
920 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
921                                    void **rcd_buffer,
922                                    int *rcd_buffer_size, __u8 lpm)
923 {
924         struct ciw *ciw;
925         char *rcd_buf = NULL;
926         int ret;
927         struct dasd_ccw_req *cqr;
928 
929         /*
930          * sanity check: scan for RCD command in extended SenseID data
931          * some devices do not support RCD
932          */
933         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
934         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
935                 ret = -EOPNOTSUPP;
936                 goto out_error;
937         }
938         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
939         if (!rcd_buf) {
940                 ret = -ENOMEM;
941                 goto out_error;
942         }
943         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
944                                    0, /* use rcd_buf as data ara */
945                                    device);
946         if (IS_ERR(cqr)) {
947                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
948                               "Could not allocate RCD request");
949                 ret = -ENOMEM;
950                 goto out_error;
951         }
952         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
953         cqr->callback = read_conf_cb;
954         ret = dasd_sleep_on(cqr);
955         /*
956          * on success we update the user input parms
957          */
958         dasd_sfree_request(cqr, cqr->memdev);
959         if (ret)
960                 goto out_error;
961 
962         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
963         *rcd_buffer = rcd_buf;
964         return 0;
965 out_error:
966         kfree(rcd_buf);
967         *rcd_buffer = NULL;
968         *rcd_buffer_size = 0;
969         return ret;
970 }
971 
972 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
973 {
974 
975         struct dasd_sneq *sneq;
976         int i, count;
977 
978         private->ned = NULL;
979         private->sneq = NULL;
980         private->vdsneq = NULL;
981         private->gneq = NULL;
982         count = private->conf_len / sizeof(struct dasd_sneq);
983         sneq = (struct dasd_sneq *)private->conf_data;
984         for (i = 0; i < count; ++i) {
985                 if (sneq->flags.identifier == 1 && sneq->format == 1)
986                         private->sneq = sneq;
987                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
988                         private->vdsneq = (struct vd_sneq *)sneq;
989                 else if (sneq->flags.identifier == 2)
990                         private->gneq = (struct dasd_gneq *)sneq;
991                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
992                         private->ned = (struct dasd_ned *)sneq;
993                 sneq++;
994         }
995         if (!private->ned || !private->gneq) {
996                 private->ned = NULL;
997                 private->sneq = NULL;
998                 private->vdsneq = NULL;
999                 private->gneq = NULL;
1000                 return -EINVAL;
1001         }
1002         return 0;
1003 
1004 };
1005 
1006 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1007 {
1008         struct dasd_gneq *gneq;
1009         int i, count, found;
1010 
1011         count = conf_len / sizeof(*gneq);
1012         gneq = (struct dasd_gneq *)conf_data;
1013         found = 0;
1014         for (i = 0; i < count; ++i) {
1015                 if (gneq->flags.identifier == 2) {
1016                         found = 1;
1017                         break;
1018                 }
1019                 gneq++;
1020         }
1021         if (found)
1022                 return ((char *)gneq)[18] & 0x07;
1023         else
1024                 return 0;
1025 }
1026 
1027 static int dasd_eckd_read_conf(struct dasd_device *device)
1028 {
1029         void *conf_data;
1030         int conf_len, conf_data_saved;
1031         int rc, path_err;
1032         __u8 lpm, opm;
1033         struct dasd_eckd_private *private, path_private;
1034         struct dasd_path *path_data;
1035         struct dasd_uid *uid;
1036         char print_path_uid[60], print_device_uid[60];
1037 
1038         private = (struct dasd_eckd_private *) device->private;
1039         path_data = &device->path_data;
1040         opm = ccw_device_get_path_mask(device->cdev);
1041         conf_data_saved = 0;
1042         path_err = 0;
1043         /* get configuration data per operational path */
1044         for (lpm = 0x80; lpm; lpm>>= 1) {
1045                 if (!(lpm & opm))
1046                         continue;
1047                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1048                                              &conf_len, lpm);
1049                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1050                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1051                                         "Read configuration data returned "
1052                                         "error %d", rc);
1053                         return rc;
1054                 }
1055                 if (conf_data == NULL) {
1056                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1057                                         "No configuration data "
1058                                         "retrieved");
1059                         /* no further analysis possible */
1060                         path_data->opm |= lpm;
1061                         continue;       /* no error */
1062                 }
1063                 /* save first valid configuration data */
1064                 if (!conf_data_saved) {
1065                         kfree(private->conf_data);
1066                         private->conf_data = conf_data;
1067                         private->conf_len = conf_len;
1068                         if (dasd_eckd_identify_conf_parts(private)) {
1069                                 private->conf_data = NULL;
1070                                 private->conf_len = 0;
1071                                 kfree(conf_data);
1072                                 continue;
1073                         }
1074                         /*
1075                          * build device UID that other path data
1076                          * can be compared to it
1077                          */
1078                         dasd_eckd_generate_uid(device);
1079                         conf_data_saved++;
1080                 } else {
1081                         path_private.conf_data = conf_data;
1082                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1083                         if (dasd_eckd_identify_conf_parts(
1084                                     &path_private)) {
1085                                 path_private.conf_data = NULL;
1086                                 path_private.conf_len = 0;
1087                                 kfree(conf_data);
1088                                 continue;
1089                         }
1090 
1091                         if (dasd_eckd_compare_path_uid(
1092                                     device, &path_private)) {
1093                                 uid = &path_private.uid;
1094                                 if (strlen(uid->vduit) > 0)
1095                                         snprintf(print_path_uid,
1096                                                  sizeof(print_path_uid),
1097                                                  "%s.%s.%04x.%02x.%s",
1098                                                  uid->vendor, uid->serial,
1099                                                  uid->ssid, uid->real_unit_addr,
1100                                                  uid->vduit);
1101                                 else
1102                                         snprintf(print_path_uid,
1103                                                  sizeof(print_path_uid),
1104                                                  "%s.%s.%04x.%02x",
1105                                                  uid->vendor, uid->serial,
1106                                                  uid->ssid,
1107                                                  uid->real_unit_addr);
1108                                 uid = &private->uid;
1109                                 if (strlen(uid->vduit) > 0)
1110                                         snprintf(print_device_uid,
1111                                                  sizeof(print_device_uid),
1112                                                  "%s.%s.%04x.%02x.%s",
1113                                                  uid->vendor, uid->serial,
1114                                                  uid->ssid, uid->real_unit_addr,
1115                                                  uid->vduit);
1116                                 else
1117                                         snprintf(print_device_uid,
1118                                                  sizeof(print_device_uid),
1119                                                  "%s.%s.%04x.%02x",
1120                                                  uid->vendor, uid->serial,
1121                                                  uid->ssid,
1122                                                  uid->real_unit_addr);
1123                                 dev_err(&device->cdev->dev,
1124                                         "Not all channel paths lead to "
1125                                         "the same device, path %02X leads to "
1126                                         "device %s instead of %s\n", lpm,
1127                                         print_path_uid, print_device_uid);
1128                                 path_err = -EINVAL;
1129                                 continue;
1130                         }
1131 
1132                         path_private.conf_data = NULL;
1133                         path_private.conf_len = 0;
1134                 }
1135                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1136                 case 0x02:
1137                         path_data->npm |= lpm;
1138                         break;
1139                 case 0x03:
1140                         path_data->ppm |= lpm;
1141                         break;
1142                 }
1143                 path_data->opm |= lpm;
1144 
1145                 if (conf_data != private->conf_data)
1146                         kfree(conf_data);
1147         }
1148 
1149         return path_err;
1150 }
1151 
1152 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1153 {
1154         struct dasd_eckd_private *private;
1155         int mdc;
1156         u32 fcx_max_data;
1157 
1158         private = (struct dasd_eckd_private *) device->private;
1159         if (private->fcx_max_data) {
1160                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1161                 if ((mdc < 0)) {
1162                         dev_warn(&device->cdev->dev,
1163                                  "Detecting the maximum data size for zHPF "
1164                                  "requests failed (rc=%d) for a new path %x\n",
1165                                  mdc, lpm);
1166                         return mdc;
1167                 }
1168                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1169                 if (fcx_max_data < private->fcx_max_data) {
1170                         dev_warn(&device->cdev->dev,
1171                                  "The maximum data size for zHPF requests %u "
1172                                  "on a new path %x is below the active maximum "
1173                                  "%u\n", fcx_max_data, lpm,
1174                                  private->fcx_max_data);
1175                         return -EACCES;
1176                 }
1177         }
1178         return 0;
1179 }
1180 
1181 static int rebuild_device_uid(struct dasd_device *device,
1182                               struct path_verification_work_data *data)
1183 {
1184         struct dasd_eckd_private *private;
1185         struct dasd_path *path_data;
1186         __u8 lpm, opm;
1187         int rc;
1188 
1189         rc = -ENODEV;
1190         private = (struct dasd_eckd_private *) device->private;
1191         path_data = &device->path_data;
1192         opm = device->path_data.opm;
1193 
1194         for (lpm = 0x80; lpm; lpm >>= 1) {
1195                 if (!(lpm & opm))
1196                         continue;
1197                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1198                 memset(&data->cqr, 0, sizeof(data->cqr));
1199                 data->cqr.cpaddr = &data->ccw;
1200                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1201                                                      data->rcd_buffer,
1202                                                      lpm);
1203 
1204                 if (rc) {
1205                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1206                                 continue;
1207                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1208                                         "Read configuration data "
1209                                         "returned error %d", rc);
1210                         break;
1211                 }
1212                 memcpy(private->conf_data, data->rcd_buffer,
1213                        DASD_ECKD_RCD_DATA_SIZE);
1214                 if (dasd_eckd_identify_conf_parts(private)) {
1215                         rc = -ENODEV;
1216                 } else /* first valid path is enough */
1217                         break;
1218         }
1219 
1220         if (!rc)
1221                 rc = dasd_eckd_generate_uid(device);
1222 
1223         return rc;
1224 }
1225 
1226 static void do_path_verification_work(struct work_struct *work)
1227 {
1228         struct path_verification_work_data *data;
1229         struct dasd_device *device;
1230         struct dasd_eckd_private path_private;
1231         struct dasd_uid *uid;
1232         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1233         __u8 lpm, opm, npm, ppm, epm;
1234         unsigned long flags;
1235         char print_uid[60];
1236         int rc;
1237 
1238         data = container_of(work, struct path_verification_work_data, worker);
1239         device = data->device;
1240 
1241         /* delay path verification until device was resumed */
1242         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1243                 schedule_work(work);
1244                 return;
1245         }
1246 
1247         opm = 0;
1248         npm = 0;
1249         ppm = 0;
1250         epm = 0;
1251         for (lpm = 0x80; lpm; lpm >>= 1) {
1252                 if (!(lpm & data->tbvpm))
1253                         continue;
1254                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1255                 memset(&data->cqr, 0, sizeof(data->cqr));
1256                 data->cqr.cpaddr = &data->ccw;
1257                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1258                                                      data->rcd_buffer,
1259                                                      lpm);
1260                 if (!rc) {
1261                         switch (dasd_eckd_path_access(data->rcd_buffer,
1262                                                       DASD_ECKD_RCD_DATA_SIZE)
1263                                 ) {
1264                         case 0x02:
1265                                 npm |= lpm;
1266                                 break;
1267                         case 0x03:
1268                                 ppm |= lpm;
1269                                 break;
1270                         }
1271                         opm |= lpm;
1272                 } else if (rc == -EOPNOTSUPP) {
1273                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1274                                         "path verification: No configuration "
1275                                         "data retrieved");
1276                         opm |= lpm;
1277                 } else if (rc == -EAGAIN) {
1278                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1279                                         "path verification: device is stopped,"
1280                                         " try again later");
1281                         epm |= lpm;
1282                 } else {
1283                         dev_warn(&device->cdev->dev,
1284                                  "Reading device feature codes failed "
1285                                  "(rc=%d) for new path %x\n", rc, lpm);
1286                         continue;
1287                 }
1288                 if (verify_fcx_max_data(device, lpm)) {
1289                         opm &= ~lpm;
1290                         npm &= ~lpm;
1291                         ppm &= ~lpm;
1292                         continue;
1293                 }
1294 
1295                 /*
1296                  * save conf_data for comparison after
1297                  * rebuild_device_uid may have changed
1298                  * the original data
1299                  */
1300                 memcpy(&path_rcd_buf, data->rcd_buffer,
1301                        DASD_ECKD_RCD_DATA_SIZE);
1302                 path_private.conf_data = (void *) &path_rcd_buf;
1303                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1304                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1305                         path_private.conf_data = NULL;
1306                         path_private.conf_len = 0;
1307                         continue;
1308                 }
1309 
1310                 /*
1311                  * compare path UID with device UID only if at least
1312                  * one valid path is left
1313                  * in other case the device UID may have changed and
1314                  * the first working path UID will be used as device UID
1315                  */
1316                 if (device->path_data.opm &&
1317                     dasd_eckd_compare_path_uid(device, &path_private)) {
1318                         /*
1319                          * the comparison was not successful
1320                          * rebuild the device UID with at least one
1321                          * known path in case a z/VM hyperswap command
1322                          * has changed the device
1323                          *
1324                          * after this compare again
1325                          *
1326                          * if either the rebuild or the recompare fails
1327                          * the path can not be used
1328                          */
1329                         if (rebuild_device_uid(device, data) ||
1330                             dasd_eckd_compare_path_uid(
1331                                     device, &path_private)) {
1332                                 uid = &path_private.uid;
1333                                 if (strlen(uid->vduit) > 0)
1334                                         snprintf(print_uid, sizeof(print_uid),
1335                                                  "%s.%s.%04x.%02x.%s",
1336                                                  uid->vendor, uid->serial,
1337                                                  uid->ssid, uid->real_unit_addr,
1338                                                  uid->vduit);
1339                                 else
1340                                         snprintf(print_uid, sizeof(print_uid),
1341                                                  "%s.%s.%04x.%02x",
1342                                                  uid->vendor, uid->serial,
1343                                                  uid->ssid,
1344                                                  uid->real_unit_addr);
1345                                 dev_err(&device->cdev->dev,
1346                                         "The newly added channel path %02X "
1347                                         "will not be used because it leads "
1348                                         "to a different device %s\n",
1349                                         lpm, print_uid);
1350                                 opm &= ~lpm;
1351                                 npm &= ~lpm;
1352                                 ppm &= ~lpm;
1353                                 continue;
1354                         }
1355                 }
1356 
1357                 /*
1358                  * There is a small chance that a path is lost again between
1359                  * above path verification and the following modification of
1360                  * the device opm mask. We could avoid that race here by using
1361                  * yet another path mask, but we rather deal with this unlikely
1362                  * situation in dasd_start_IO.
1363                  */
1364                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1365                 if (!device->path_data.opm && opm) {
1366                         device->path_data.opm = opm;
1367                         dasd_generic_path_operational(device);
1368                 } else
1369                         device->path_data.opm |= opm;
1370                 device->path_data.npm |= npm;
1371                 device->path_data.ppm |= ppm;
1372                 device->path_data.tbvpm |= epm;
1373                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1374         }
1375 
1376         dasd_put_device(device);
1377         if (data->isglobal)
1378                 mutex_unlock(&dasd_path_verification_mutex);
1379         else
1380                 kfree(data);
1381 }
1382 
1383 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1384 {
1385         struct path_verification_work_data *data;
1386 
1387         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1388         if (!data) {
1389                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1390                         data = path_verification_worker;
1391                         data->isglobal = 1;
1392                 } else
1393                         return -ENOMEM;
1394         } else {
1395                 memset(data, 0, sizeof(*data));
1396                 data->isglobal = 0;
1397         }
1398         INIT_WORK(&data->worker, do_path_verification_work);
1399         dasd_get_device(device);
1400         data->device = device;
1401         data->tbvpm = lpm;
1402         schedule_work(&data->worker);
1403         return 0;
1404 }
1405 
1406 static int dasd_eckd_read_features(struct dasd_device *device)
1407 {
1408         struct dasd_psf_prssd_data *prssdp;
1409         struct dasd_rssd_features *features;
1410         struct dasd_ccw_req *cqr;
1411         struct ccw1 *ccw;
1412         int rc;
1413         struct dasd_eckd_private *private;
1414 
1415         private = (struct dasd_eckd_private *) device->private;
1416         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1417         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1418                                    (sizeof(struct dasd_psf_prssd_data) +
1419                                     sizeof(struct dasd_rssd_features)),
1420                                    device);
1421         if (IS_ERR(cqr)) {
1422                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1423                                 "allocate initialization request");
1424                 return PTR_ERR(cqr);
1425         }
1426         cqr->startdev = device;
1427         cqr->memdev = device;
1428         cqr->block = NULL;
1429         cqr->retries = 256;
1430         cqr->expires = 10 * HZ;
1431 
1432         /* Prepare for Read Subsystem Data */
1433         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1434         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1435         prssdp->order = PSF_ORDER_PRSSD;
1436         prssdp->suborder = 0x41;        /* Read Feature Codes */
1437         /* all other bytes of prssdp must be zero */
1438 
1439         ccw = cqr->cpaddr;
1440         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1441         ccw->count = sizeof(struct dasd_psf_prssd_data);
1442         ccw->flags |= CCW_FLAG_CC;
1443         ccw->cda = (__u32)(addr_t) prssdp;
1444 
1445         /* Read Subsystem Data - feature codes */
1446         features = (struct dasd_rssd_features *) (prssdp + 1);
1447         memset(features, 0, sizeof(struct dasd_rssd_features));
1448 
1449         ccw++;
1450         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1451         ccw->count = sizeof(struct dasd_rssd_features);
1452         ccw->cda = (__u32)(addr_t) features;
1453 
1454         cqr->buildclk = get_tod_clock();
1455         cqr->status = DASD_CQR_FILLED;
1456         rc = dasd_sleep_on(cqr);
1457         if (rc == 0) {
1458                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1459                 features = (struct dasd_rssd_features *) (prssdp + 1);
1460                 memcpy(&private->features, features,
1461                        sizeof(struct dasd_rssd_features));
1462         } else
1463                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1464                          " failed with rc=%d\n", rc);
1465         dasd_sfree_request(cqr, cqr->memdev);
1466         return rc;
1467 }
1468 
1469 
1470 /*
1471  * Build CP for Perform Subsystem Function - SSC.
1472  */
1473 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1474                                                     int enable_pav)
1475 {
1476         struct dasd_ccw_req *cqr;
1477         struct dasd_psf_ssc_data *psf_ssc_data;
1478         struct ccw1 *ccw;
1479 
1480         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1481                                   sizeof(struct dasd_psf_ssc_data),
1482                                   device);
1483 
1484         if (IS_ERR(cqr)) {
1485                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1486                            "Could not allocate PSF-SSC request");
1487                 return cqr;
1488         }
1489         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1490         psf_ssc_data->order = PSF_ORDER_SSC;
1491         psf_ssc_data->suborder = 0xc0;
1492         if (enable_pav) {
1493                 psf_ssc_data->suborder |= 0x08;
1494                 psf_ssc_data->reserved[0] = 0x88;
1495         }
1496         ccw = cqr->cpaddr;
1497         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1498         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1499         ccw->count = 66;
1500 
1501         cqr->startdev = device;
1502         cqr->memdev = device;
1503         cqr->block = NULL;
1504         cqr->retries = 256;
1505         cqr->expires = 10*HZ;
1506         cqr->buildclk = get_tod_clock();
1507         cqr->status = DASD_CQR_FILLED;
1508         return cqr;
1509 }
1510 
1511 /*
1512  * Perform Subsystem Function.
1513  * It is necessary to trigger CIO for channel revalidation since this
1514  * call might change behaviour of DASD devices.
1515  */
1516 static int
1517 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1518                   unsigned long flags)
1519 {
1520         struct dasd_ccw_req *cqr;
1521         int rc;
1522 
1523         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1524         if (IS_ERR(cqr))
1525                 return PTR_ERR(cqr);
1526 
1527         /*
1528          * set flags e.g. turn on failfast, to prevent blocking
1529          * the calling function should handle failed requests
1530          */
1531         cqr->flags |= flags;
1532 
1533         rc = dasd_sleep_on(cqr);
1534         if (!rc)
1535                 /* trigger CIO to reprobe devices */
1536                 css_schedule_reprobe();
1537         else if (cqr->intrc == -EAGAIN)
1538                 rc = -EAGAIN;
1539 
1540         dasd_sfree_request(cqr, cqr->memdev);
1541         return rc;
1542 }
1543 
1544 /*
1545  * Valide storage server of current device.
1546  */
1547 static int dasd_eckd_validate_server(struct dasd_device *device,
1548                                      unsigned long flags)
1549 {
1550         int rc;
1551         struct dasd_eckd_private *private;
1552         int enable_pav;
1553 
1554         private = (struct dasd_eckd_private *) device->private;
1555         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1556             private->uid.type == UA_HYPER_PAV_ALIAS)
1557                 return 0;
1558         if (dasd_nopav || MACHINE_IS_VM)
1559                 enable_pav = 0;
1560         else
1561                 enable_pav = 1;
1562         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1563 
1564         /* may be requested feature is not available on server,
1565          * therefore just report error and go ahead */
1566         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1567                         "returned rc=%d", private->uid.ssid, rc);
1568         return rc;
1569 }
1570 
1571 /*
1572  * worker to do a validate server in case of a lost pathgroup
1573  */
1574 static void dasd_eckd_do_validate_server(struct work_struct *work)
1575 {
1576         struct dasd_device *device = container_of(work, struct dasd_device,
1577                                                   kick_validate);
1578         unsigned long flags = 0;
1579 
1580         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1581         if (dasd_eckd_validate_server(device, flags)
1582             == -EAGAIN) {
1583                 /* schedule worker again if failed */
1584                 schedule_work(&device->kick_validate);
1585                 return;
1586         }
1587 
1588         dasd_put_device(device);
1589 }
1590 
1591 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1592 {
1593         dasd_get_device(device);
1594         /* exit if device not online or in offline processing */
1595         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1596            device->state < DASD_STATE_ONLINE) {
1597                 dasd_put_device(device);
1598                 return;
1599         }
1600         /* queue call to do_validate_server to the kernel event daemon. */
1601         schedule_work(&device->kick_validate);
1602 }
1603 
1604 static u32 get_fcx_max_data(struct dasd_device *device)
1605 {
1606 #if defined(CONFIG_64BIT)
1607         int tpm, mdc;
1608         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1609         struct dasd_eckd_private *private;
1610 
1611         if (dasd_nofcx)
1612                 return 0;
1613         /* is transport mode supported? */
1614         private = (struct dasd_eckd_private *) device->private;
1615         fcx_in_css = css_general_characteristics.fcx;
1616         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1617         fcx_in_features = private->features.feature[40] & 0x80;
1618         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1619 
1620         if (!tpm)
1621                 return 0;
1622 
1623         mdc = ccw_device_get_mdc(device->cdev, 0);
1624         if (mdc < 0) {
1625                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1626                          " data size for zHPF requests failed\n");
1627                 return 0;
1628         } else
1629                 return mdc * FCX_MAX_DATA_FACTOR;
1630 #else
1631         return 0;
1632 #endif
1633 }
1634 
1635 /*
1636  * Check device characteristics.
1637  * If the device is accessible using ECKD discipline, the device is enabled.
1638  */
1639 static int
1640 dasd_eckd_check_characteristics(struct dasd_device *device)
1641 {
1642         struct dasd_eckd_private *private;
1643         struct dasd_block *block;
1644         struct dasd_uid temp_uid;
1645         int rc, i;
1646         int readonly;
1647         unsigned long value;
1648 
1649         /* setup work queue for validate server*/
1650         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1651 
1652         if (!ccw_device_is_pathgroup(device->cdev)) {
1653                 dev_warn(&device->cdev->dev,
1654                          "A channel path group could not be established\n");
1655                 return -EIO;
1656         }
1657         if (!ccw_device_is_multipath(device->cdev)) {
1658                 dev_info(&device->cdev->dev,
1659                          "The DASD is not operating in multipath mode\n");
1660         }
1661         private = (struct dasd_eckd_private *) device->private;
1662         if (!private) {
1663                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1664                 if (!private) {
1665                         dev_warn(&device->cdev->dev,
1666                                  "Allocating memory for private DASD data "
1667                                  "failed\n");
1668                         return -ENOMEM;
1669                 }
1670                 device->private = (void *) private;
1671         } else {
1672                 memset(private, 0, sizeof(*private));
1673         }
1674         /* Invalidate status of initial analysis. */
1675         private->init_cqr_status = -1;
1676         /* Set default cache operations. */
1677         private->attrib.operation = DASD_NORMAL_CACHE;
1678         private->attrib.nr_cyl = 0;
1679 
1680         /* Read Configuration Data */
1681         rc = dasd_eckd_read_conf(device);
1682         if (rc)
1683                 goto out_err1;
1684 
1685         /* set default timeout */
1686         device->default_expires = DASD_EXPIRES;
1687         /* set default retry count */
1688         device->default_retries = DASD_RETRIES;
1689 
1690         if (private->gneq) {
1691                 value = 1;
1692                 for (i = 0; i < private->gneq->timeout.value; i++)
1693                         value = 10 * value;
1694                 value = value * private->gneq->timeout.number;
1695                 /* do not accept useless values */
1696                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1697                         device->default_expires = value;
1698         }
1699 
1700         dasd_eckd_get_uid(device, &temp_uid);
1701         if (temp_uid.type == UA_BASE_DEVICE) {
1702                 block = dasd_alloc_block();
1703                 if (IS_ERR(block)) {
1704                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1705                                         "could not allocate dasd "
1706                                         "block structure");
1707                         rc = PTR_ERR(block);
1708                         goto out_err1;
1709                 }
1710                 device->block = block;
1711                 block->base = device;
1712         }
1713 
1714         /* register lcu with alias handling, enable PAV */
1715         rc = dasd_alias_make_device_known_to_lcu(device);
1716         if (rc)
1717                 goto out_err2;
1718 
1719         dasd_eckd_validate_server(device, 0);
1720 
1721         /* device may report different configuration data after LCU setup */
1722         rc = dasd_eckd_read_conf(device);
1723         if (rc)
1724                 goto out_err3;
1725 
1726         /* Read Feature Codes */
1727         dasd_eckd_read_features(device);
1728 
1729         /* Read Device Characteristics */
1730         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1731                                          &private->rdc_data, 64);
1732         if (rc) {
1733                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1734                                 "Read device characteristic failed, rc=%d", rc);
1735                 goto out_err3;
1736         }
1737 
1738         if ((device->features & DASD_FEATURE_USERAW) &&
1739             !(private->rdc_data.facilities.RT_in_LR)) {
1740                 dev_err(&device->cdev->dev, "The storage server does not "
1741                         "support raw-track access\n");
1742                 rc = -EINVAL;
1743                 goto out_err3;
1744         }
1745 
1746         /* find the valid cylinder size */
1747         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1748             private->rdc_data.long_no_cyl)
1749                 private->real_cyl = private->rdc_data.long_no_cyl;
1750         else
1751                 private->real_cyl = private->rdc_data.no_cyl;
1752 
1753         private->fcx_max_data = get_fcx_max_data(device);
1754 
1755         readonly = dasd_device_is_ro(device);
1756         if (readonly)
1757                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1758 
1759         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1760                  "with %d cylinders, %d heads, %d sectors%s\n",
1761                  private->rdc_data.dev_type,
1762                  private->rdc_data.dev_model,
1763                  private->rdc_data.cu_type,
1764                  private->rdc_data.cu_model.model,
1765                  private->real_cyl,
1766                  private->rdc_data.trk_per_cyl,
1767                  private->rdc_data.sec_per_trk,
1768                  readonly ? ", read-only device" : "");
1769         return 0;
1770 
1771 out_err3:
1772         dasd_alias_disconnect_device_from_lcu(device);
1773 out_err2:
1774         dasd_free_block(device->block);
1775         device->block = NULL;
1776 out_err1:
1777         kfree(private->conf_data);
1778         kfree(device->private);
1779         device->private = NULL;
1780         return rc;
1781 }
1782 
1783 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1784 {
1785         struct dasd_eckd_private *private;
1786 
1787         private = (struct dasd_eckd_private *) device->private;
1788         dasd_alias_disconnect_device_from_lcu(device);
1789         private->ned = NULL;
1790         private->sneq = NULL;
1791         private->vdsneq = NULL;
1792         private->gneq = NULL;
1793         private->conf_len = 0;
1794         kfree(private->conf_data);
1795         private->conf_data = NULL;
1796 }
1797 
1798 static struct dasd_ccw_req *
1799 dasd_eckd_analysis_ccw(struct dasd_device *device)
1800 {
1801         struct dasd_eckd_private *private;
1802         struct eckd_count *count_data;
1803         struct LO_eckd_data *LO_data;
1804         struct dasd_ccw_req *cqr;
1805         struct ccw1 *ccw;
1806         int cplength, datasize;
1807         int i;
1808 
1809         private = (struct dasd_eckd_private *) device->private;
1810 
1811         cplength = 8;
1812         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1813         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1814         if (IS_ERR(cqr))
1815                 return cqr;
1816         ccw = cqr->cpaddr;
1817         /* Define extent for the first 3 tracks. */
1818         define_extent(ccw++, cqr->data, 0, 2,
1819                       DASD_ECKD_CCW_READ_COUNT, device);
1820         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1821         /* Locate record for the first 4 records on track 0. */
1822         ccw[-1].flags |= CCW_FLAG_CC;
1823         locate_record(ccw++, LO_data++, 0, 0, 4,
1824                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1825 
1826         count_data = private->count_area;
1827         for (i = 0; i < 4; i++) {
1828                 ccw[-1].flags |= CCW_FLAG_CC;
1829                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1830                 ccw->flags = 0;
1831                 ccw->count = 8;
1832                 ccw->cda = (__u32)(addr_t) count_data;
1833                 ccw++;
1834                 count_data++;
1835         }
1836 
1837         /* Locate record for the first record on track 2. */
1838         ccw[-1].flags |= CCW_FLAG_CC;
1839         locate_record(ccw++, LO_data++, 2, 0, 1,
1840                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1841         /* Read count ccw. */
1842         ccw[-1].flags |= CCW_FLAG_CC;
1843         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1844         ccw->flags = 0;
1845         ccw->count = 8;
1846         ccw->cda = (__u32)(addr_t) count_data;
1847 
1848         cqr->block = NULL;
1849         cqr->startdev = device;
1850         cqr->memdev = device;
1851         cqr->retries = 255;
1852         cqr->buildclk = get_tod_clock();
1853         cqr->status = DASD_CQR_FILLED;
1854         return cqr;
1855 }
1856 
1857 /* differentiate between 'no record found' and any other error */
1858 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1859 {
1860         char *sense;
1861         if (init_cqr->status == DASD_CQR_DONE)
1862                 return INIT_CQR_OK;
1863         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1864                  init_cqr->status == DASD_CQR_FAILED) {
1865                 sense = dasd_get_sense(&init_cqr->irb);
1866                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1867                         return INIT_CQR_UNFORMATTED;
1868                 else
1869                         return INIT_CQR_ERROR;
1870         } else
1871                 return INIT_CQR_ERROR;
1872 }
1873 
1874 /*
1875  * This is the callback function for the init_analysis cqr. It saves
1876  * the status of the initial analysis ccw before it frees it and kicks
1877  * the device to continue the startup sequence. This will call
1878  * dasd_eckd_do_analysis again (if the devices has not been marked
1879  * for deletion in the meantime).
1880  */
1881 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1882                                         void *data)
1883 {
1884         struct dasd_eckd_private *private;
1885         struct dasd_device *device;
1886 
1887         device = init_cqr->startdev;
1888         private = (struct dasd_eckd_private *) device->private;
1889         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1890         dasd_sfree_request(init_cqr, device);
1891         dasd_kick_device(device);
1892 }
1893 
1894 static int dasd_eckd_start_analysis(struct dasd_block *block)
1895 {
1896         struct dasd_ccw_req *init_cqr;
1897 
1898         init_cqr = dasd_eckd_analysis_ccw(block->base);
1899         if (IS_ERR(init_cqr))
1900                 return PTR_ERR(init_cqr);
1901         init_cqr->callback = dasd_eckd_analysis_callback;
1902         init_cqr->callback_data = NULL;
1903         init_cqr->expires = 5*HZ;
1904         /* first try without ERP, so we can later handle unformatted
1905          * devices as special case
1906          */
1907         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1908         init_cqr->retries = 0;
1909         dasd_add_request_head(init_cqr);
1910         return -EAGAIN;
1911 }
1912 
1913 static int dasd_eckd_end_analysis(struct dasd_block *block)
1914 {
1915         struct dasd_device *device;
1916         struct dasd_eckd_private *private;
1917         struct eckd_count *count_area;
1918         unsigned int sb, blk_per_trk;
1919         int status, i;
1920         struct dasd_ccw_req *init_cqr;
1921 
1922         device = block->base;
1923         private = (struct dasd_eckd_private *) device->private;
1924         status = private->init_cqr_status;
1925         private->init_cqr_status = -1;
1926         if (status == INIT_CQR_ERROR) {
1927                 /* try again, this time with full ERP */
1928                 init_cqr = dasd_eckd_analysis_ccw(device);
1929                 dasd_sleep_on(init_cqr);
1930                 status = dasd_eckd_analysis_evaluation(init_cqr);
1931                 dasd_sfree_request(init_cqr, device);
1932         }
1933 
1934         if (device->features & DASD_FEATURE_USERAW) {
1935                 block->bp_block = DASD_RAW_BLOCKSIZE;
1936                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1937                 block->s2b_shift = 3;
1938                 goto raw;
1939         }
1940 
1941         if (status == INIT_CQR_UNFORMATTED) {
1942                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1943                 return -EMEDIUMTYPE;
1944         } else if (status == INIT_CQR_ERROR) {
1945                 dev_err(&device->cdev->dev,
1946                         "Detecting the DASD disk layout failed because "
1947                         "of an I/O error\n");
1948                 return -EIO;
1949         }
1950 
1951         private->uses_cdl = 1;
1952         /* Check Track 0 for Compatible Disk Layout */
1953         count_area = NULL;
1954         for (i = 0; i < 3; i++) {
1955                 if (private->count_area[i].kl != 4 ||
1956                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1957                     private->count_area[i].cyl != 0 ||
1958                     private->count_area[i].head != count_area_head[i] ||
1959                     private->count_area[i].record != count_area_rec[i]) {
1960                         private->uses_cdl = 0;
1961                         break;
1962                 }
1963         }
1964         if (i == 3)
1965                 count_area = &private->count_area[4];
1966 
1967         if (private->uses_cdl == 0) {
1968                 for (i = 0; i < 5; i++) {
1969                         if ((private->count_area[i].kl != 0) ||
1970                             (private->count_area[i].dl !=
1971                              private->count_area[0].dl) ||
1972                             private->count_area[i].cyl !=  0 ||
1973                             private->count_area[i].head != count_area_head[i] ||
1974                             private->count_area[i].record != count_area_rec[i])
1975                                 break;
1976                 }
1977                 if (i == 5)
1978                         count_area = &private->count_area[0];
1979         } else {
1980                 if (private->count_area[3].record == 1)
1981                         dev_warn(&device->cdev->dev,
1982                                  "Track 0 has no records following the VTOC\n");
1983         }
1984 
1985         if (count_area != NULL && count_area->kl == 0) {
1986                 /* we found notthing violating our disk layout */
1987                 if (dasd_check_blocksize(count_area->dl) == 0)
1988                         block->bp_block = count_area->dl;
1989         }
1990         if (block->bp_block == 0) {
1991                 dev_warn(&device->cdev->dev,
1992                          "The disk layout of the DASD is not supported\n");
1993                 return -EMEDIUMTYPE;
1994         }
1995         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1996         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1997                 block->s2b_shift++;
1998 
1999         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2000 
2001 raw:
2002         block->blocks = (private->real_cyl *
2003                           private->rdc_data.trk_per_cyl *
2004                           blk_per_trk);
2005 
2006         dev_info(&device->cdev->dev,
2007                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2008                  "%s\n", (block->bp_block >> 10),
2009                  ((private->real_cyl *
2010                    private->rdc_data.trk_per_cyl *
2011                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2012                  ((blk_per_trk * block->bp_block) >> 10),
2013                  private->uses_cdl ?
2014                  "compatible disk layout" : "linux disk layout");
2015 
2016         return 0;
2017 }
2018 
2019 static int dasd_eckd_do_analysis(struct dasd_block *block)
2020 {
2021         struct dasd_eckd_private *private;
2022 
2023         private = (struct dasd_eckd_private *) block->base->private;
2024         if (private->init_cqr_status < 0)
2025                 return dasd_eckd_start_analysis(block);
2026         else
2027                 return dasd_eckd_end_analysis(block);
2028 }
2029 
2030 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2031 {
2032         return dasd_alias_add_device(device);
2033 };
2034 
2035 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2036 {
2037         cancel_work_sync(&device->reload_device);
2038         cancel_work_sync(&device->kick_validate);
2039         return 0;
2040 };
2041 
2042 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2043 {
2044         return dasd_alias_remove_device(device);
2045 };
2046 
2047 static int
2048 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2049 {
2050         struct dasd_eckd_private *private;
2051 
2052         private = (struct dasd_eckd_private *) block->base->private;
2053         if (dasd_check_blocksize(block->bp_block) == 0) {
2054                 geo->sectors = recs_per_track(&private->rdc_data,
2055                                               0, block->bp_block);
2056         }
2057         geo->cylinders = private->rdc_data.no_cyl;
2058         geo->heads = private->rdc_data.trk_per_cyl;
2059         return 0;
2060 }
2061 
2062 static struct dasd_ccw_req *
2063 dasd_eckd_build_format(struct dasd_device *base,
2064                        struct format_data_t *fdata,
2065                        int enable_pav)
2066 {
2067         struct dasd_eckd_private *base_priv;
2068         struct dasd_eckd_private *start_priv;
2069         struct dasd_device *startdev = NULL;
2070         struct dasd_ccw_req *fcp;
2071         struct eckd_count *ect;
2072         struct ch_t address;
2073         struct ccw1 *ccw;
2074         void *data;
2075         int rpt;
2076         int cplength, datasize;
2077         int i, j;
2078         int intensity = 0;
2079         int r0_perm;
2080         int nr_tracks;
2081         int use_prefix;
2082 
2083         if (enable_pav)
2084                 startdev = dasd_alias_get_start_dev(base);
2085 
2086         if (!startdev)
2087                 startdev = base;
2088 
2089         start_priv = (struct dasd_eckd_private *) startdev->private;
2090         base_priv = (struct dasd_eckd_private *) base->private;
2091 
2092         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2093 
2094         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2095 
2096         /*
2097          * fdata->intensity is a bit string that tells us what to do:
2098          *   Bit 0: write record zero
2099          *   Bit 1: write home address, currently not supported
2100          *   Bit 2: invalidate tracks
2101          *   Bit 3: use OS/390 compatible disk layout (cdl)
2102          *   Bit 4: do not allow storage subsystem to modify record zero
2103          * Only some bit combinations do make sense.
2104          */
2105         if (fdata->intensity & 0x10) {
2106                 r0_perm = 0;
2107                 intensity = fdata->intensity & ~0x10;
2108         } else {
2109                 r0_perm = 1;
2110                 intensity = fdata->intensity;
2111         }
2112 
2113         use_prefix = base_priv->features.feature[8] & 0x01;
2114 
2115         switch (intensity) {
2116         case 0x00:      /* Normal format */
2117         case 0x08:      /* Normal format, use cdl. */
2118                 cplength = 2 + (rpt*nr_tracks);
2119                 if (use_prefix)
2120                         datasize = sizeof(struct PFX_eckd_data) +
2121                                 sizeof(struct LO_eckd_data) +
2122                                 rpt * nr_tracks * sizeof(struct eckd_count);
2123                 else
2124                         datasize = sizeof(struct DE_eckd_data) +
2125                                 sizeof(struct LO_eckd_data) +
2126                                 rpt * nr_tracks * sizeof(struct eckd_count);
2127                 break;
2128         case 0x01:      /* Write record zero and format track. */
2129         case 0x09:      /* Write record zero and format track, use cdl. */
2130                 cplength = 2 + rpt * nr_tracks;
2131                 if (use_prefix)
2132                         datasize = sizeof(struct PFX_eckd_data) +
2133                                 sizeof(struct LO_eckd_data) +
2134                                 sizeof(struct eckd_count) +
2135                                 rpt * nr_tracks * sizeof(struct eckd_count);
2136                 else
2137                         datasize = sizeof(struct DE_eckd_data) +
2138                                 sizeof(struct LO_eckd_data) +
2139                                 sizeof(struct eckd_count) +
2140                                 rpt * nr_tracks * sizeof(struct eckd_count);
2141                 break;
2142         case 0x04:      /* Invalidate track. */
2143         case 0x0c:      /* Invalidate track, use cdl. */
2144                 cplength = 3;
2145                 if (use_prefix)
2146                         datasize = sizeof(struct PFX_eckd_data) +
2147                                 sizeof(struct LO_eckd_data) +
2148                                 sizeof(struct eckd_count);
2149                 else
2150                         datasize = sizeof(struct DE_eckd_data) +
2151                                 sizeof(struct LO_eckd_data) +
2152                                 sizeof(struct eckd_count);
2153                 break;
2154         default:
2155                 dev_warn(&startdev->cdev->dev,
2156                          "An I/O control call used incorrect flags 0x%x\n",
2157                          fdata->intensity);
2158                 return ERR_PTR(-EINVAL);
2159         }
2160         /* Allocate the format ccw request. */
2161         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2162                                    datasize, startdev);
2163         if (IS_ERR(fcp))
2164                 return fcp;
2165 
2166         start_priv->count++;
2167         data = fcp->data;
2168         ccw = fcp->cpaddr;
2169 
2170         switch (intensity & ~0x08) {
2171         case 0x00: /* Normal format. */
2172                 if (use_prefix) {
2173                         prefix(ccw++, (struct PFX_eckd_data *) data,
2174                                fdata->start_unit, fdata->stop_unit,
2175                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2176                         /* grant subsystem permission to format R0 */
2177                         if (r0_perm)
2178                                 ((struct PFX_eckd_data *)data)
2179                                         ->define_extent.ga_extended |= 0x04;
2180                         data += sizeof(struct PFX_eckd_data);
2181                 } else {
2182                         define_extent(ccw++, (struct DE_eckd_data *) data,
2183                                       fdata->start_unit, fdata->stop_unit,
2184                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2185                         /* grant subsystem permission to format R0 */
2186                         if (r0_perm)
2187                                 ((struct DE_eckd_data *) data)
2188                                         ->ga_extended |= 0x04;
2189                         data += sizeof(struct DE_eckd_data);
2190                 }
2191                 ccw[-1].flags |= CCW_FLAG_CC;
2192                 locate_record(ccw++, (struct LO_eckd_data *) data,
2193                               fdata->start_unit, 0, rpt*nr_tracks,
2194                               DASD_ECKD_CCW_WRITE_CKD, base,
2195                               fdata->blksize);
2196                 data += sizeof(struct LO_eckd_data);
2197                 break;
2198         case 0x01: /* Write record zero + format track. */
2199                 if (use_prefix) {
2200                         prefix(ccw++, (struct PFX_eckd_data *) data,
2201                                fdata->start_unit, fdata->stop_unit,
2202                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2203                                base, startdev);
2204                         data += sizeof(struct PFX_eckd_data);
2205                 } else {
2206                         define_extent(ccw++, (struct DE_eckd_data *) data,
2207                                fdata->start_unit, fdata->stop_unit,
2208                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2209                         data += sizeof(struct DE_eckd_data);
2210                 }
2211                 ccw[-1].flags |= CCW_FLAG_CC;
2212                 locate_record(ccw++, (struct LO_eckd_data *) data,
2213                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2214                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2215                               base->block->bp_block);
2216                 data += sizeof(struct LO_eckd_data);
2217                 break;
2218         case 0x04: /* Invalidate track. */
2219                 if (use_prefix) {
2220                         prefix(ccw++, (struct PFX_eckd_data *) data,
2221                                fdata->start_unit, fdata->stop_unit,
2222                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2223                         data += sizeof(struct PFX_eckd_data);
2224                 } else {
2225                         define_extent(ccw++, (struct DE_eckd_data *) data,
2226                                fdata->start_unit, fdata->stop_unit,
2227                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2228                         data += sizeof(struct DE_eckd_data);
2229                 }
2230                 ccw[-1].flags |= CCW_FLAG_CC;
2231                 locate_record(ccw++, (struct LO_eckd_data *) data,
2232                               fdata->start_unit, 0, 1,
2233                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2234                 data += sizeof(struct LO_eckd_data);
2235                 break;
2236         }
2237 
2238         for (j = 0; j < nr_tracks; j++) {
2239                 /* calculate cylinder and head for the current track */
2240                 set_ch_t(&address,
2241                          (fdata->start_unit + j) /
2242                          base_priv->rdc_data.trk_per_cyl,
2243                          (fdata->start_unit + j) %
2244                          base_priv->rdc_data.trk_per_cyl);
2245                 if (intensity & 0x01) { /* write record zero */
2246                         ect = (struct eckd_count *) data;
2247                         data += sizeof(struct eckd_count);
2248                         ect->cyl = address.cyl;
2249                         ect->head = address.head;
2250                         ect->record = 0;
2251                         ect->kl = 0;
2252                         ect->dl = 8;
2253                         ccw[-1].flags |= CCW_FLAG_CC;
2254                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2255                         ccw->flags = CCW_FLAG_SLI;
2256                         ccw->count = 8;
2257                         ccw->cda = (__u32)(addr_t) ect;
2258                         ccw++;
2259                 }
2260                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2261                         ect = (struct eckd_count *) data;
2262                         data += sizeof(struct eckd_count);
2263                         ect->cyl = address.cyl;
2264                         ect->head = address.head;
2265                         ect->record = 1;
2266                         ect->kl = 0;
2267                         ect->dl = 0;
2268                         ccw[-1].flags |= CCW_FLAG_CC;
2269                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2270                         ccw->flags = CCW_FLAG_SLI;
2271                         ccw->count = 8;
2272                         ccw->cda = (__u32)(addr_t) ect;
2273                 } else {                /* write remaining records */
2274                         for (i = 0; i < rpt; i++) {
2275                                 ect = (struct eckd_count *) data;
2276                                 data += sizeof(struct eckd_count);
2277                                 ect->cyl = address.cyl;
2278                                 ect->head = address.head;
2279                                 ect->record = i + 1;
2280                                 ect->kl = 0;
2281                                 ect->dl = fdata->blksize;
2282                                 /*
2283                                  * Check for special tracks 0-1
2284                                  * when formatting CDL
2285                                  */
2286                                 if ((intensity & 0x08) &&
2287                                     fdata->start_unit == 0) {
2288                                         if (i < 3) {
2289                                                 ect->kl = 4;
2290                                                 ect->dl = sizes_trk0[i] - 4;
2291                                         }
2292                                 }
2293                                 if ((intensity & 0x08) &&
2294                                     fdata->start_unit == 1) {
2295                                         ect->kl = 44;
2296                                         ect->dl = LABEL_SIZE - 44;
2297                                 }
2298                                 ccw[-1].flags |= CCW_FLAG_CC;
2299                                 if (i != 0 || j == 0)
2300                                         ccw->cmd_code =
2301                                                 DASD_ECKD_CCW_WRITE_CKD;
2302                                 else
2303                                         ccw->cmd_code =
2304                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2305                                 ccw->flags = CCW_FLAG_SLI;
2306                                 ccw->count = 8;
2307                                         ccw->cda = (__u32)(addr_t) ect;
2308                                         ccw++;
2309                         }
2310                 }
2311         }
2312 
2313         fcp->startdev = startdev;
2314         fcp->memdev = startdev;
2315         fcp->basedev = base;
2316         fcp->retries = 256;
2317         fcp->expires = startdev->default_expires * HZ;
2318         fcp->buildclk = get_tod_clock();
2319         fcp->status = DASD_CQR_FILLED;
2320 
2321         return fcp;
2322 }
2323 
2324 static int
2325 dasd_eckd_format_device(struct dasd_device *base,
2326                         struct format_data_t *fdata,
2327                         int enable_pav)
2328 {
2329         struct dasd_ccw_req *cqr, *n;
2330         struct dasd_block *block;
2331         struct dasd_eckd_private *private;
2332         struct list_head format_queue;
2333         struct dasd_device *device;
2334         int old_stop, format_step;
2335         int step, rc = 0, sleep_rc;
2336 
2337         block = base->block;
2338         private = (struct dasd_eckd_private *) base->private;
2339 
2340         /* Sanity checks. */
2341         if (fdata->start_unit >=
2342             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2343                 dev_warn(&base->cdev->dev,
2344                          "Start track number %u used in formatting is too big\n",
2345                          fdata->start_unit);
2346                 return -EINVAL;
2347         }
2348         if (fdata->stop_unit >=
2349             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2350                 dev_warn(&base->cdev->dev,
2351                          "Stop track number %u used in formatting is too big\n",
2352                          fdata->stop_unit);
2353                 return -EINVAL;
2354         }
2355         if (fdata->start_unit > fdata->stop_unit) {
2356                 dev_warn(&base->cdev->dev,
2357                          "Start track %u used in formatting exceeds end track\n",
2358                          fdata->start_unit);
2359                 return -EINVAL;
2360         }
2361         if (dasd_check_blocksize(fdata->blksize) != 0) {
2362                 dev_warn(&base->cdev->dev,
2363                          "The DASD cannot be formatted with block size %u\n",
2364                          fdata->blksize);
2365                 return -EINVAL;
2366         }
2367 
2368         INIT_LIST_HEAD(&format_queue);
2369 
2370         old_stop = fdata->stop_unit;
2371         while (fdata->start_unit <= 1) {
2372                 fdata->stop_unit = fdata->start_unit;
2373                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2374                 list_add(&cqr->blocklist, &format_queue);
2375 
2376                 fdata->stop_unit = old_stop;
2377                 fdata->start_unit++;
2378 
2379                 if (fdata->start_unit > fdata->stop_unit)
2380                         goto sleep;
2381         }
2382 
2383 retry:
2384         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2385                                            fdata->blksize);
2386         while (fdata->start_unit <= old_stop) {
2387                 step = fdata->stop_unit - fdata->start_unit + 1;
2388                 if (step > format_step)
2389                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2390 
2391                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2392                 if (IS_ERR(cqr)) {
2393                         if (PTR_ERR(cqr) == -ENOMEM) {
2394                                 /*
2395                                  * not enough memory available
2396                                  * go to out and start requests
2397                                  * retry after first requests were finished
2398                                  */
2399                                 fdata->stop_unit = old_stop;
2400                                 goto sleep;
2401                         } else
2402                                 return PTR_ERR(cqr);
2403                 }
2404                 list_add(&cqr->blocklist, &format_queue);
2405 
2406                 fdata->start_unit = fdata->stop_unit + 1;
2407                 fdata->stop_unit = old_stop;
2408         }
2409 
2410 sleep:
2411         sleep_rc = dasd_sleep_on_queue(&format_queue);
2412 
2413         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2414                 device = cqr->startdev;
2415                 private = (struct dasd_eckd_private *) device->private;
2416                 if (cqr->status == DASD_CQR_FAILED)
2417                         rc = -EIO;
2418                 list_del_init(&cqr->blocklist);
2419                 dasd_sfree_request(cqr, device);
2420                 private->count--;
2421         }
2422 
2423         if (sleep_rc)
2424                 return sleep_rc;
2425 
2426         /*
2427          * in case of ENOMEM we need to retry after
2428          * first requests are finished
2429          */
2430         if (fdata->start_unit <= fdata->stop_unit)
2431                 goto retry;
2432 
2433         return rc;
2434 }
2435 
2436 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2437 {
2438         if (cqr->retries < 0) {
2439                 cqr->status = DASD_CQR_FAILED;
2440                 return;
2441         }
2442         cqr->status = DASD_CQR_FILLED;
2443         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2444                 dasd_eckd_reset_ccw_to_base_io(cqr);
2445                 cqr->startdev = cqr->block->base;
2446                 cqr->lpm = cqr->block->base->path_data.opm;
2447         }
2448 };
2449 
2450 static dasd_erp_fn_t
2451 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2452 {
2453         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2454         struct ccw_device *cdev = device->cdev;
2455 
2456         switch (cdev->id.cu_type) {
2457         case 0x3990:
2458         case 0x2105:
2459         case 0x2107:
2460         case 0x1750:
2461                 return dasd_3990_erp_action;
2462         case 0x9343:
2463         case 0x3880:
2464         default:
2465                 return dasd_default_erp_action;
2466         }
2467 }
2468 
2469 static dasd_erp_fn_t
2470 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2471 {
2472         return dasd_default_erp_postaction;
2473 }
2474 
2475 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2476                                               struct dasd_ccw_req *cqr,
2477                                               struct irb *irb)
2478 {
2479         char mask;
2480         char *sense = NULL;
2481         struct dasd_eckd_private *private;
2482 
2483         private = (struct dasd_eckd_private *) device->private;
2484         /* first of all check for state change pending interrupt */
2485         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2486         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2487                 /*
2488                  * for alias only, not in offline processing
2489                  * and only if not suspended
2490                  */
2491                 if (!device->block && private->lcu &&
2492                     device->state == DASD_STATE_ONLINE &&
2493                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2494                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2495                         /*
2496                          * the state change could be caused by an alias
2497                          * reassignment remove device from alias handling
2498                          * to prevent new requests from being scheduled on
2499                          * the wrong alias device
2500                          */
2501                         dasd_alias_remove_device(device);
2502 
2503                         /* schedule worker to reload device */
2504                         dasd_reload_device(device);
2505                 }
2506                 dasd_generic_handle_state_change(device);
2507                 return;
2508         }
2509 
2510         sense = dasd_get_sense(irb);
2511         if (!sense)
2512                 return;
2513 
2514         /* summary unit check */
2515         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2516             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2517                 dasd_alias_handle_summary_unit_check(device, irb);
2518                 return;
2519         }
2520 
2521         /* service information message SIM */
2522         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2523             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2524                 dasd_3990_erp_handle_sim(device, sense);
2525                 return;
2526         }
2527 
2528         /* loss of device reservation is handled via base devices only
2529          * as alias devices may be used with several bases
2530          */
2531         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2532             (sense[7] == 0x3F) &&
2533             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2534             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2535                 if (device->features & DASD_FEATURE_FAILONSLCK)
2536                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2537                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2538                 dev_err(&device->cdev->dev,
2539                         "The device reservation was lost\n");
2540         }
2541 }
2542 
2543 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2544                                                struct dasd_device *startdev,
2545                                                struct dasd_block *block,
2546                                                struct request *req,
2547                                                sector_t first_rec,
2548                                                sector_t last_rec,
2549                                                sector_t first_trk,
2550                                                sector_t last_trk,
2551                                                unsigned int first_offs,
2552                                                unsigned int last_offs,
2553                                                unsigned int blk_per_trk,
2554                                                unsigned int blksize)
2555 {
2556         struct dasd_eckd_private *private;
2557         unsigned long *idaws;
2558         struct LO_eckd_data *LO_data;
2559         struct dasd_ccw_req *cqr;
2560         struct ccw1 *ccw;
2561         struct req_iterator iter;
2562         struct bio_vec bv;
2563         char *dst;
2564         unsigned int off;
2565         int count, cidaw, cplength, datasize;
2566         sector_t recid;
2567         unsigned char cmd, rcmd;
2568         int use_prefix;
2569         struct dasd_device *basedev;
2570 
2571         basedev = block->base;
2572         private = (struct dasd_eckd_private *) basedev->private;
2573         if (rq_data_dir(req) == READ)
2574                 cmd = DASD_ECKD_CCW_READ_MT;
2575         else if (rq_data_dir(req) == WRITE)
2576                 cmd = DASD_ECKD_CCW_WRITE_MT;
2577         else
2578                 return ERR_PTR(-EINVAL);
2579 
2580         /* Check struct bio and count the number of blocks for the request. */
2581         count = 0;
2582         cidaw = 0;
2583         rq_for_each_segment(bv, req, iter) {
2584                 if (bv.bv_len & (blksize - 1))
2585                         /* Eckd can only do full blocks. */
2586                         return ERR_PTR(-EINVAL);
2587                 count += bv.bv_len >> (block->s2b_shift + 9);
2588 #if defined(CONFIG_64BIT)
2589                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2590                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
2591 #endif
2592         }
2593         /* Paranoia. */
2594         if (count != last_rec - first_rec + 1)
2595                 return ERR_PTR(-EINVAL);
2596 
2597         /* use the prefix command if available */
2598         use_prefix = private->features.feature[8] & 0x01;
2599         if (use_prefix) {
2600                 /* 1x prefix + number of blocks */
2601                 cplength = 2 + count;
2602                 /* 1x prefix + cidaws*sizeof(long) */
2603                 datasize = sizeof(struct PFX_eckd_data) +
2604                         sizeof(struct LO_eckd_data) +
2605                         cidaw * sizeof(unsigned long);
2606         } else {
2607                 /* 1x define extent + 1x locate record + number of blocks */
2608                 cplength = 2 + count;
2609                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2610                 datasize = sizeof(struct DE_eckd_data) +
2611                         sizeof(struct LO_eckd_data) +
2612                         cidaw * sizeof(unsigned long);
2613         }
2614         /* Find out the number of additional locate record ccws for cdl. */
2615         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2616                 if (last_rec >= 2*blk_per_trk)
2617                         count = 2*blk_per_trk - first_rec;
2618                 cplength += count;
2619                 datasize += count*sizeof(struct LO_eckd_data);
2620         }
2621         /* Allocate the ccw request. */
2622         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2623                                    startdev);
2624         if (IS_ERR(cqr))
2625                 return cqr;
2626         ccw = cqr->cpaddr;
2627         /* First ccw is define extent or prefix. */
2628         if (use_prefix) {
2629                 if (prefix(ccw++, cqr->data, first_trk,
2630                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2631                         /* Clock not in sync and XRC is enabled.
2632                          * Try again later.
2633                          */
2634                         dasd_sfree_request(cqr, startdev);
2635                         return ERR_PTR(-EAGAIN);
2636                 }
2637                 idaws = (unsigned long *) (cqr->data +
2638                                            sizeof(struct PFX_eckd_data));
2639         } else {
2640                 if (define_extent(ccw++, cqr->data, first_trk,
2641                                   last_trk, cmd, basedev) == -EAGAIN) {
2642                         /* Clock not in sync and XRC is enabled.
2643                          * Try again later.
2644                          */
2645                         dasd_sfree_request(cqr, startdev);
2646                         return ERR_PTR(-EAGAIN);
2647                 }
2648                 idaws = (unsigned long *) (cqr->data +
2649                                            sizeof(struct DE_eckd_data));
2650         }
2651         /* Build locate_record+read/write/ccws. */
2652         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2653         recid = first_rec;
2654         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2655                 /* Only standard blocks so there is just one locate record. */
2656                 ccw[-1].flags |= CCW_FLAG_CC;
2657                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2658                               last_rec - recid + 1, cmd, basedev, blksize);
2659         }
2660         rq_for_each_segment(bv, req, iter) {
2661                 dst = page_address(bv.bv_page) + bv.bv_offset;
2662                 if (dasd_page_cache) {
2663                         char *copy = kmem_cache_alloc(dasd_page_cache,
2664                                                       GFP_DMA | __GFP_NOWARN);
2665                         if (copy && rq_data_dir(req) == WRITE)
2666                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2667                         if (copy)
2668                                 dst = copy + bv.bv_offset;
2669                 }
2670                 for (off = 0; off < bv.bv_len; off += blksize) {
2671                         sector_t trkid = recid;
2672                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2673                         rcmd = cmd;
2674                         count = blksize;
2675                         /* Locate record for cdl special block ? */
2676                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2677                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2678                                         rcmd |= 0x8;
2679                                         count = dasd_eckd_cdl_reclen(recid);
2680                                         if (count < blksize &&
2681                                             rq_data_dir(req) == READ)
2682                                                 memset(dst + count, 0xe5,
2683                                                        blksize - count);
2684                                 }
2685                                 ccw[-1].flags |= CCW_FLAG_CC;
2686                                 locate_record(ccw++, LO_data++,
2687                                               trkid, recoffs + 1,
2688                                               1, rcmd, basedev, count);
2689                         }
2690                         /* Locate record for standard blocks ? */
2691                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2692                                 ccw[-1].flags |= CCW_FLAG_CC;
2693                                 locate_record(ccw++, LO_data++,
2694                                               trkid, recoffs + 1,
2695                                               last_rec - recid + 1,
2696                                               cmd, basedev, count);
2697                         }
2698                         /* Read/write ccw. */
2699                         ccw[-1].flags |= CCW_FLAG_CC;
2700                         ccw->cmd_code = rcmd;
2701                         ccw->count = count;
2702                         if (idal_is_needed(dst, blksize)) {
2703                                 ccw->cda = (__u32)(addr_t) idaws;
2704                                 ccw->flags = CCW_FLAG_IDA;
2705                                 idaws = idal_create_words(idaws, dst, blksize);
2706                         } else {
2707                                 ccw->cda = (__u32)(addr_t) dst;
2708                                 ccw->flags = 0;
2709                         }
2710                         ccw++;
2711                         dst += blksize;
2712                         recid++;
2713                 }
2714         }
2715         if (blk_noretry_request(req) ||
2716             block->base->features & DASD_FEATURE_FAILFAST)
2717                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2718         cqr->startdev = startdev;
2719         cqr->memdev = startdev;
2720         cqr->block = block;
2721         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2722         cqr->lpm = startdev->path_data.ppm;
2723         cqr->retries = startdev->default_retries;
2724         cqr->buildclk = get_tod_clock();
2725         cqr->status = DASD_CQR_FILLED;
2726         return cqr;
2727 }
2728 
2729 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2730                                                struct dasd_device *startdev,
2731                                                struct dasd_block *block,
2732                                                struct request *req,
2733                                                sector_t first_rec,
2734                                                sector_t last_rec,
2735                                                sector_t first_trk,
2736                                                sector_t last_trk,
2737                                                unsigned int first_offs,
2738                                                unsigned int last_offs,
2739                                                unsigned int blk_per_trk,
2740                                                unsigned int blksize)
2741 {
2742         unsigned long *idaws;
2743         struct dasd_ccw_req *cqr;
2744         struct ccw1 *ccw;
2745         struct req_iterator iter;
2746         struct bio_vec bv;
2747         char *dst, *idaw_dst;
2748         unsigned int cidaw, cplength, datasize;
2749         unsigned int tlf;
2750         sector_t recid;
2751         unsigned char cmd;
2752         struct dasd_device *basedev;
2753         unsigned int trkcount, count, count_to_trk_end;
2754         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2755         unsigned char new_track, end_idaw;
2756         sector_t trkid;
2757         unsigned int recoffs;
2758 
2759         basedev = block->base;
2760         if (rq_data_dir(req) == READ)
2761                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2762         else if (rq_data_dir(req) == WRITE)
2763                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2764         else
2765                 return ERR_PTR(-EINVAL);
2766 
2767         /* Track based I/O needs IDAWs for each page, and not just for
2768          * 64 bit addresses. We need additional idals for pages
2769          * that get filled from two tracks, so we use the number
2770          * of records as upper limit.
2771          */
2772         cidaw = last_rec - first_rec + 1;
2773         trkcount = last_trk - first_trk + 1;
2774 
2775         /* 1x prefix + one read/write ccw per track */
2776         cplength = 1 + trkcount;
2777 
2778         /* on 31-bit we need space for two 32 bit addresses per page
2779          * on 64-bit one 64 bit address
2780          */
2781         datasize = sizeof(struct PFX_eckd_data) +
2782                 cidaw * sizeof(unsigned long long);
2783 
2784         /* Allocate the ccw request. */
2785         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2786                                    startdev);
2787         if (IS_ERR(cqr))
2788                 return cqr;
2789         ccw = cqr->cpaddr;
2790         /* transfer length factor: how many bytes to read from the last track */
2791         if (first_trk == last_trk)
2792                 tlf = last_offs - first_offs + 1;
2793         else
2794                 tlf = last_offs + 1;
2795         tlf *= blksize;
2796 
2797         if (prefix_LRE(ccw++, cqr->data, first_trk,
2798                        last_trk, cmd, basedev, startdev,
2799                        1 /* format */, first_offs + 1,
2800                        trkcount, blksize,
2801                        tlf) == -EAGAIN) {
2802                 /* Clock not in sync and XRC is enabled.
2803                  * Try again later.
2804                  */
2805                 dasd_sfree_request(cqr, startdev);
2806                 return ERR_PTR(-EAGAIN);
2807         }
2808 
2809         /*
2810          * The translation of request into ccw programs must meet the
2811          * following conditions:
2812          * - all idaws but the first and the last must address full pages
2813          *   (or 2K blocks on 31-bit)
2814          * - the scope of a ccw and it's idal ends with the track boundaries
2815          */
2816         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2817         recid = first_rec;
2818         new_track = 1;
2819         end_idaw = 0;
2820         len_to_track_end = 0;
2821         idaw_dst = NULL;
2822         idaw_len = 0;
2823         rq_for_each_segment(bv, req, iter) {
2824                 dst = page_address(bv.bv_page) + bv.bv_offset;
2825                 seg_len = bv.bv_len;
2826                 while (seg_len) {
2827                         if (new_track) {
2828                                 trkid = recid;
2829                                 recoffs = sector_div(trkid, blk_per_trk);
2830                                 count_to_trk_end = blk_per_trk - recoffs;
2831                                 count = min((last_rec - recid + 1),
2832                                             (sector_t)count_to_trk_end);
2833                                 len_to_track_end = count * blksize;
2834                                 ccw[-1].flags |= CCW_FLAG_CC;
2835                                 ccw->cmd_code = cmd;
2836                                 ccw->count = len_to_track_end;
2837                                 ccw->cda = (__u32)(addr_t)idaws;
2838                                 ccw->flags = CCW_FLAG_IDA;
2839                                 ccw++;
2840                                 recid += count;
2841                                 new_track = 0;
2842                                 /* first idaw for a ccw may start anywhere */
2843                                 if (!idaw_dst)
2844                                         idaw_dst = dst;
2845                         }
2846                         /* If we start a new idaw, we must make sure that it
2847                          * starts on an IDA_BLOCK_SIZE boundary.
2848                          * If we continue an idaw, we must make sure that the
2849                          * current segment begins where the so far accumulated
2850                          * idaw ends
2851                          */
2852                         if (!idaw_dst) {
2853                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2854                                         dasd_sfree_request(cqr, startdev);
2855                                         return ERR_PTR(-ERANGE);
2856                                 } else
2857                                         idaw_dst = dst;
2858                         }
2859                         if ((idaw_dst + idaw_len) != dst) {
2860                                 dasd_sfree_request(cqr, startdev);
2861                                 return ERR_PTR(-ERANGE);
2862                         }
2863                         part_len = min(seg_len, len_to_track_end);
2864                         seg_len -= part_len;
2865                         dst += part_len;
2866                         idaw_len += part_len;
2867                         len_to_track_end -= part_len;
2868                         /* collected memory area ends on an IDA_BLOCK border,
2869                          * -> create an idaw
2870                          * idal_create_words will handle cases where idaw_len
2871                          * is larger then IDA_BLOCK_SIZE
2872                          */
2873                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2874                                 end_idaw = 1;
2875                         /* We also need to end the idaw at track end */
2876                         if (!len_to_track_end) {
2877                                 new_track = 1;
2878                                 end_idaw = 1;
2879                         }
2880                         if (end_idaw) {
2881                                 idaws = idal_create_words(idaws, idaw_dst,
2882                                                           idaw_len);
2883                                 idaw_dst = NULL;
2884                                 idaw_len = 0;
2885                                 end_idaw = 0;
2886                         }
2887                 }
2888         }
2889 
2890         if (blk_noretry_request(req) ||
2891             block->base->features & DASD_FEATURE_FAILFAST)
2892                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2893         cqr->startdev = startdev;
2894         cqr->memdev = startdev;
2895         cqr->block = block;
2896         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2897         cqr->lpm = startdev->path_data.ppm;
2898         cqr->retries = startdev->default_retries;
2899         cqr->buildclk = get_tod_clock();
2900         cqr->status = DASD_CQR_FILLED;
2901         return cqr;
2902 }
2903 
2904 static int prepare_itcw(struct itcw *itcw,
2905                         unsigned int trk, unsigned int totrk, int cmd,
2906                         struct dasd_device *basedev,
2907                         struct dasd_device *startdev,
2908                         unsigned int rec_on_trk, int count,
2909                         unsigned int blksize,
2910                         unsigned int total_data_size,
2911                         unsigned int tlf,
2912                         unsigned int blk_per_trk)
2913 {
2914         struct PFX_eckd_data pfxdata;
2915         struct dasd_eckd_private *basepriv, *startpriv;
2916         struct DE_eckd_data *dedata;
2917         struct LRE_eckd_data *lredata;
2918         struct dcw *dcw;
2919 
2920         u32 begcyl, endcyl;
2921         u16 heads, beghead, endhead;
2922         u8 pfx_cmd;
2923 
2924         int rc = 0;
2925         int sector = 0;
2926         int dn, d;
2927 
2928 
2929         /* setup prefix data */
2930         basepriv = (struct dasd_eckd_private *) basedev->private;
2931         startpriv = (struct dasd_eckd_private *) startdev->private;
2932         dedata = &pfxdata.define_extent;
2933         lredata = &pfxdata.locate_record;
2934 
2935         memset(&pfxdata, 0, sizeof(pfxdata));
2936         pfxdata.format = 1; /* PFX with LRE */
2937         pfxdata.base_address = basepriv->ned->unit_addr;
2938         pfxdata.base_lss = basepriv->ned->ID;
2939         pfxdata.validity.define_extent = 1;
2940 
2941         /* private uid is kept up to date, conf_data may be outdated */
2942         if (startpriv->uid.type != UA_BASE_DEVICE) {
2943                 pfxdata.validity.verify_base = 1;
2944                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2945                         pfxdata.validity.hyper_pav = 1;
2946         }
2947 
2948         switch (cmd) {
2949         case DASD_ECKD_CCW_READ_TRACK_DATA:
2950                 dedata->mask.perm = 0x1;
2951                 dedata->attributes.operation = basepriv->attrib.operation;
2952                 dedata->blk_size = blksize;
2953                 dedata->ga_extended |= 0x42;
2954                 lredata->operation.orientation = 0x0;
2955                 lredata->operation.operation = 0x0C;
2956                 lredata->auxiliary.check_bytes = 0x01;
2957                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2958                 break;
2959         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2960                 dedata->mask.perm = 0x02;
2961                 dedata->attributes.operation = basepriv->attrib.operation;
2962                 dedata->blk_size = blksize;
2963                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2964                 dedata->ga_extended |= 0x42;
2965                 lredata->operation.orientation = 0x0;
2966                 lredata->operation.operation = 0x3F;
2967                 lredata->extended_operation = 0x23;
2968                 lredata->auxiliary.check_bytes = 0x2;
2969                 pfx_cmd = DASD_ECKD_CCW_PFX;
2970                 break;
2971         default:
2972                 DBF_DEV_EVENT(DBF_ERR, basedev,
2973                               "prepare itcw, unknown opcode 0x%x", cmd);
2974                 BUG();
2975                 break;
2976         }
2977         if (rc)
2978                 return rc;
2979 
2980         dedata->attributes.mode = 0x3;  /* ECKD */
2981 
2982         heads = basepriv->rdc_data.trk_per_cyl;
2983         begcyl = trk / heads;
2984         beghead = trk % heads;
2985         endcyl = totrk / heads;
2986         endhead = totrk % heads;
2987 
2988         /* check for sequential prestage - enhance cylinder range */
2989         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2990             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2991 
2992                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2993                         endcyl += basepriv->attrib.nr_cyl;
2994                 else
2995                         endcyl = (basepriv->real_cyl - 1);
2996         }
2997 
2998         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2999         set_ch_t(&dedata->end_ext, endcyl, endhead);
3000 
3001         dedata->ep_format = 0x20; /* records per track is valid */
3002         dedata->ep_rec_per_track = blk_per_trk;
3003 
3004         if (rec_on_trk) {
3005                 switch (basepriv->rdc_data.dev_type) {
3006                 case 0x3390:
3007                         dn = ceil_quot(blksize + 6, 232);
3008                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3009                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3010                         break;
3011                 case 0x3380:
3012                         d = 7 + ceil_quot(blksize + 12, 32);
3013                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3014                         break;
3015                 }
3016         }
3017 
3018         lredata->auxiliary.length_valid = 1;
3019         lredata->auxiliary.length_scope = 1;
3020         lredata->auxiliary.imbedded_ccw_valid = 1;
3021         lredata->length = tlf;
3022         lredata->imbedded_ccw = cmd;
3023         lredata->count = count;
3024         lredata->sector = sector;
3025         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3026         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3027         lredata->search_arg.head = lredata->seek_addr.head;
3028         lredata->search_arg.record = rec_on_trk;
3029 
3030         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3031                      &pfxdata, sizeof(pfxdata), total_data_size);
3032         return PTR_RET(dcw);
3033 }
3034 
3035 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3036                                                struct dasd_device *startdev,
3037                                                struct dasd_block *block,
3038                                                struct request *req,
3039                                                sector_t first_rec,
3040                                                sector_t last_rec,
3041                                                sector_t first_trk,
3042                                                sector_t last_trk,
3043                                                unsigned int first_offs,
3044                                                unsigned int last_offs,
3045                                                unsigned int blk_per_trk,
3046                                                unsigned int blksize)
3047 {
3048         struct dasd_ccw_req *cqr;
3049         struct req_iterator iter;
3050         struct bio_vec bv;
3051         char *dst;
3052         unsigned int trkcount, ctidaw;
3053         unsigned char cmd;
3054         struct dasd_device *basedev;
3055         unsigned int tlf;
3056         struct itcw *itcw;
3057         struct tidaw *last_tidaw = NULL;
3058         int itcw_op;
3059         size_t itcw_size;
3060         u8 tidaw_flags;
3061         unsigned int seg_len, part_len, len_to_track_end;
3062         unsigned char new_track;
3063         sector_t recid, trkid;
3064         unsigned int offs;
3065         unsigned int count, count_to_trk_end;
3066         int ret;
3067 
3068         basedev = block->base;
3069         if (rq_data_dir(req) == READ) {
3070                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3071                 itcw_op = ITCW_OP_READ;
3072         } else if (rq_data_dir(req) == WRITE) {
3073                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3074                 itcw_op = ITCW_OP_WRITE;
3075         } else
3076                 return ERR_PTR(-EINVAL);
3077 
3078         /* trackbased I/O needs address all memory via TIDAWs,
3079          * not just for 64 bit addresses. This allows us to map
3080          * each segment directly to one tidaw.
3081          * In the case of write requests, additional tidaws may
3082          * be needed when a segment crosses a track boundary.
3083          */
3084         trkcount = last_trk - first_trk + 1;
3085         ctidaw = 0;
3086         rq_for_each_segment(bv, req, iter) {
3087                 ++ctidaw;
3088         }
3089         if (rq_data_dir(req) == WRITE)
3090                 ctidaw += (last_trk - first_trk);
3091 
3092         /* Allocate the ccw request. */
3093         itcw_size = itcw_calc_size(0, ctidaw, 0);
3094         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3095         if (IS_ERR(cqr))
3096                 return cqr;
3097 
3098         /* transfer length factor: how many bytes to read from the last track */
3099         if (first_trk == last_trk)
3100                 tlf = last_offs - first_offs + 1;
3101         else
3102                 tlf = last_offs + 1;
3103         tlf *= blksize;
3104 
3105         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3106         if (IS_ERR(itcw)) {
3107                 ret = -EINVAL;
3108                 goto out_error;
3109         }
3110         cqr->cpaddr = itcw_get_tcw(itcw);
3111         if (prepare_itcw(itcw, first_trk, last_trk,
3112                          cmd, basedev, startdev,
3113                          first_offs + 1,
3114                          trkcount, blksize,
3115                          (last_rec - first_rec + 1) * blksize,
3116                          tlf, blk_per_trk) == -EAGAIN) {
3117                 /* Clock not in sync and XRC is enabled.
3118                  * Try again later.
3119                  */
3120                 ret = -EAGAIN;
3121                 goto out_error;
3122         }
3123         len_to_track_end = 0;
3124         /*
3125          * A tidaw can address 4k of memory, but must not cross page boundaries
3126          * We can let the block layer handle this by setting
3127          * blk_queue_segment_boundary to page boundaries and
3128          * blk_max_segment_size to page size when setting up the request queue.
3129          * For write requests, a TIDAW must not cross track boundaries, because
3130          * we have to set the CBC flag on the last tidaw for each track.
3131          */
3132         if (rq_data_dir(req) == WRITE) {
3133                 new_track = 1;
3134                 recid = first_rec;
3135                 rq_for_each_segment(bv, req, iter) {
3136                         dst = page_address(bv.bv_page) + bv.bv_offset;
3137                         seg_len = bv.bv_len;
3138                         while (seg_len) {
3139                                 if (new_track) {
3140                                         trkid = recid;
3141                                         offs = sector_div(trkid, blk_per_trk);
3142                                         count_to_trk_end = blk_per_trk - offs;
3143                                         count = min((last_rec - recid + 1),
3144                                                     (sector_t)count_to_trk_end);
3145                                         len_to_track_end = count * blksize;
3146                                         recid += count;
3147                                         new_track = 0;
3148                                 }
3149                                 part_len = min(seg_len, len_to_track_end);
3150                                 seg_len -= part_len;
3151                                 len_to_track_end -= part_len;
3152                                 /* We need to end the tidaw at track end */
3153                                 if (!len_to_track_end) {
3154                                         new_track = 1;
3155                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3156                                 } else
3157                                         tidaw_flags = 0;
3158                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3159                                                             dst, part_len);
3160                                 if (IS_ERR(last_tidaw)) {
3161                                         ret = -EINVAL;
3162                                         goto out_error;
3163                                 }
3164                                 dst += part_len;
3165                         }
3166                 }
3167         } else {
3168                 rq_for_each_segment(bv, req, iter) {
3169                         dst = page_address(bv.bv_page) + bv.bv_offset;
3170                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3171                                                     dst, bv.bv_len);
3172                         if (IS_ERR(last_tidaw)) {
3173                                 ret = -EINVAL;
3174                                 goto out_error;
3175                         }
3176                 }
3177         }
3178         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3179         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3180         itcw_finalize(itcw);
3181 
3182         if (blk_noretry_request(req) ||
3183             block->base->features & DASD_FEATURE_FAILFAST)
3184                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3185         cqr->cpmode = 1;
3186         cqr->startdev = startdev;
3187         cqr->memdev = startdev;
3188         cqr->block = block;
3189         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3190         cqr->lpm = startdev->path_data.ppm;
3191         cqr->retries = startdev->default_retries;
3192         cqr->buildclk = get_tod_clock();
3193         cqr->status = DASD_CQR_FILLED;
3194         return cqr;
3195 out_error:
3196         dasd_sfree_request(cqr, startdev);
3197         return ERR_PTR(ret);
3198 }
3199 
3200 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3201                                                struct dasd_block *block,
3202                                                struct request *req)
3203 {
3204         int cmdrtd, cmdwtd;
3205         int use_prefix;
3206         int fcx_multitrack;
3207         struct dasd_eckd_private *private;
3208         struct dasd_device *basedev;
3209         sector_t first_rec, last_rec;
3210         sector_t first_trk, last_trk;
3211         unsigned int first_offs, last_offs;
3212         unsigned int blk_per_trk, blksize;
3213         int cdlspecial;
3214         unsigned int data_size;
3215         struct dasd_ccw_req *cqr;
3216 
3217         basedev = block->base;
3218         private = (struct dasd_eckd_private *) basedev->private;
3219 
3220         /* Calculate number of blocks/records per track. */
3221         blksize = block->bp_block;
3222         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3223         if (blk_per_trk == 0)
3224                 return ERR_PTR(-EINVAL);
3225         /* Calculate record id of first and last block. */
3226         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3227         first_offs = sector_div(first_trk, blk_per_trk);
3228         last_rec = last_trk =
3229                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3230         last_offs = sector_div(last_trk, blk_per_trk);
3231         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3232 
3233         fcx_multitrack = private->features.feature[40] & 0x20;
3234         data_size = blk_rq_bytes(req);
3235         if (data_size % blksize)
3236                 return ERR_PTR(-EINVAL);
3237         /* tpm write request add CBC data on each track boundary */
3238         if (rq_data_dir(req) == WRITE)
3239                 data_size += (last_trk - first_trk) * 4;
3240 
3241         /* is read track data and write track data in command mode supported? */
3242         cmdrtd = private->features.feature[9] & 0x20;
3243         cmdwtd = private->features.feature[12] & 0x40;
3244         use_prefix = private->features.feature[8] & 0x01;
3245 
3246         cqr = NULL;
3247         if (cdlspecial || dasd_page_cache) {
3248                 /* do nothing, just fall through to the cmd mode single case */
3249         } else if ((data_size <= private->fcx_max_data)
3250                    && (fcx_multitrack || (first_trk == last_trk))) {
3251                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3252                                                     first_rec, last_rec,
3253                                                     first_trk, last_trk,
3254                                                     first_offs, last_offs,
3255                                                     blk_per_trk, blksize);
3256                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3257                     (PTR_ERR(cqr) != -ENOMEM))
3258                         cqr = NULL;
3259         } else if (use_prefix &&
3260                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3261                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3262                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3263                                                    first_rec, last_rec,
3264                                                    first_trk, last_trk,
3265                                                    first_offs, last_offs,
3266                                                    blk_per_trk, blksize);
3267                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3268                     (PTR_ERR(cqr) != -ENOMEM))
3269                         cqr = NULL;
3270         }
3271         if (!cqr)
3272                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3273                                                     first_rec, last_rec,
3274                                                     first_trk, last_trk,
3275                                                     first_offs, last_offs,
3276                                                     blk_per_trk, blksize);
3277         return cqr;
3278 }
3279 
3280 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3281                                                struct dasd_block *block,
3282                                                struct request *req)
3283 {
3284         unsigned long *idaws;
3285         struct dasd_device *basedev;
3286         struct dasd_ccw_req *cqr;
3287         struct ccw1 *ccw;
3288         struct req_iterator iter;
3289         struct bio_vec bv;
3290         char *dst;
3291         unsigned char cmd;
3292         unsigned int trkcount;
3293         unsigned int seg_len, len_to_track_end;
3294         unsigned int first_offs;
3295         unsigned int cidaw, cplength, datasize;
3296         sector_t first_trk, last_trk, sectors;
3297         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3298         unsigned int pfx_datasize;
3299 
3300         /*
3301          * raw track access needs to be mutiple of 64k and on 64k boundary
3302          * For read requests we can fix an incorrect alignment by padding
3303          * the request with dummy pages.
3304          */
3305         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3306         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3307                 DASD_RAW_SECTORS_PER_TRACK;
3308         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3309                 DASD_RAW_SECTORS_PER_TRACK;
3310         basedev = block->base;
3311         if ((start_padding_sectors || end_padding_sectors) &&
3312             (rq_data_dir(req) == WRITE)) {
3313                 DBF_DEV_EVENT(DBF_ERR, basedev,
3314                               "raw write not track aligned (%lu,%lu) req %p",
3315                               start_padding_sectors, end_padding_sectors, req);
3316                 cqr = ERR_PTR(-EINVAL);
3317                 goto out;
3318         }
3319 
3320         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3321         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3322                 DASD_RAW_SECTORS_PER_TRACK;
3323         trkcount = last_trk - first_trk + 1;
3324         first_offs = 0;
3325 
3326         if (rq_data_dir(req) == READ)
3327                 cmd = DASD_ECKD_CCW_READ_TRACK;
3328         else if (rq_data_dir(req) == WRITE)
3329                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3330         else {
3331                 cqr = ERR_PTR(-EINVAL);
3332                 goto out;
3333         }
3334 
3335         /*
3336          * Raw track based I/O needs IDAWs for each page,
3337          * and not just for 64 bit addresses.
3338          */
3339         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3340 
3341         /* 1x prefix + one read/write ccw per track */
3342         cplength = 1 + trkcount;
3343 
3344         /*
3345          * struct PFX_eckd_data has up to 2 byte as extended parameter
3346          * this is needed for write full track and has to be mentioned
3347          * separately
3348          * add 8 instead of 2 to keep 8 byte boundary
3349          */
3350         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3351 
3352         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3353 
3354         /* Allocate the ccw request. */
3355         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3356                                    datasize, startdev);
3357         if (IS_ERR(cqr))
3358                 goto out;
3359         ccw = cqr->cpaddr;
3360 
3361         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3362                        basedev, startdev, 1 /* format */, first_offs + 1,
3363                        trkcount, 0, 0) == -EAGAIN) {
3364                 /* Clock not in sync and XRC is enabled.
3365                  * Try again later.
3366                  */
3367                 dasd_sfree_request(cqr, startdev);
3368                 cqr = ERR_PTR(-EAGAIN);
3369                 goto out;
3370         }
3371 
3372         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3373         len_to_track_end = 0;
3374         if (start_padding_sectors) {
3375                 ccw[-1].flags |= CCW_FLAG_CC;
3376                 ccw->cmd_code = cmd;
3377                 /* maximum 3390 track size */
3378                 ccw->count = 57326;
3379                 /* 64k map to one track */
3380                 len_to_track_end = 65536 - start_padding_sectors * 512;
3381                 ccw->cda = (__u32)(addr_t)idaws;
3382                 ccw->flags |= CCW_FLAG_IDA;
3383                 ccw->flags |= CCW_FLAG_SLI;
3384                 ccw++;
3385                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3386                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3387         }
3388         rq_for_each_segment(bv, req, iter) {
3389                 dst = page_address(bv.bv_page) + bv.bv_offset;
3390                 seg_len = bv.bv_len;
3391                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3392                         memset(dst, 0, seg_len);
3393                 if (!len_to_track_end) {
3394                         ccw[-1].flags |= CCW_FLAG_CC;
3395                         ccw->cmd_code = cmd;
3396                         /* maximum 3390 track size */
3397                         ccw->count = 57326;
3398                         /* 64k map to one track */
3399                         len_to_track_end = 65536;
3400                         ccw->cda = (__u32)(addr_t)idaws;
3401                         ccw->flags |= CCW_FLAG_IDA;
3402                         ccw->flags |= CCW_FLAG_SLI;
3403                         ccw++;
3404                 }
3405                 len_to_track_end -= seg_len;
3406                 idaws = idal_create_words(idaws, dst, seg_len);
3407         }
3408         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3409                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3410         if (blk_noretry_request(req) ||
3411             block->base->features & DASD_FEATURE_FAILFAST)
3412                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3413         cqr->startdev = startdev;
3414         cqr->memdev = startdev;
3415         cqr->block = block;
3416         cqr->expires = startdev->default_expires * HZ;
3417         cqr->lpm = startdev->path_data.ppm;
3418         cqr->retries = startdev->default_retries;
3419         cqr->buildclk = get_tod_clock();
3420         cqr->status = DASD_CQR_FILLED;
3421 
3422         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3423                 cqr = NULL;
3424 out:
3425         return cqr;
3426 }
3427 
3428 
3429 static int
3430 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3431 {
3432         struct dasd_eckd_private *private;
3433         struct ccw1 *ccw;
3434         struct req_iterator iter;
3435         struct bio_vec bv;
3436         char *dst, *cda;
3437         unsigned int blksize, blk_per_trk, off;
3438         sector_t recid;
3439         int status;
3440 
3441         if (!dasd_page_cache)
3442                 goto out;
3443         private = (struct dasd_eckd_private *) cqr->block->base->private;
3444         blksize = cqr->block->bp_block;
3445         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3446         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3447         ccw = cqr->cpaddr;
3448         /* Skip over define extent & locate record. */
3449         ccw++;
3450         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3451                 ccw++;
3452         rq_for_each_segment(bv, req, iter) {
3453                 dst = page_address(bv.bv_page) + bv.bv_offset;
3454                 for (off = 0; off < bv.bv_len; off += blksize) {
3455                         /* Skip locate record. */
3456                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3457                                 ccw++;
3458                         if (dst) {
3459                                 if (ccw->flags & CCW_FLAG_IDA)
3460                                         cda = *((char **)((addr_t) ccw->cda));
3461                                 else
3462                                         cda = (char *)((addr_t) ccw->cda);
3463                                 if (dst != cda) {
3464                                         if (rq_data_dir(req) == READ)
3465                                                 memcpy(dst, cda, bv.bv_len);
3466                                         kmem_cache_free(dasd_page_cache,
3467                                             (void *)((addr_t)cda & PAGE_MASK));
3468                                 }
3469                                 dst = NULL;
3470                         }
3471                         ccw++;
3472                         recid++;
3473                 }
3474         }
3475 out:
3476         status = cqr->status == DASD_CQR_DONE;
3477         dasd_sfree_request(cqr, cqr->memdev);
3478         return status;
3479 }
3480 
3481 /*
3482  * Modify ccw/tcw in cqr so it can be started on a base device.
3483  *
3484  * Note that this is not enough to restart the cqr!
3485  * Either reset cqr->startdev as well (summary unit check handling)
3486  * or restart via separate cqr (as in ERP handling).
3487  */
3488 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3489 {
3490         struct ccw1 *ccw;
3491         struct PFX_eckd_data *pfxdata;
3492         struct tcw *tcw;
3493         struct tccb *tccb;
3494         struct dcw *dcw;
3495 
3496         if (cqr->cpmode == 1) {
3497                 tcw = cqr->cpaddr;
3498                 tccb = tcw_get_tccb(tcw);
3499                 dcw = (struct dcw *)&tccb->tca[0];
3500                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3501                 pfxdata->validity.verify_base = 0;
3502                 pfxdata->validity.hyper_pav = 0;
3503         } else {
3504                 ccw = cqr->cpaddr;
3505                 pfxdata = cqr->data;
3506                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3507                         pfxdata->validity.verify_base = 0;
3508                         pfxdata->validity.hyper_pav = 0;
3509                 }
3510         }
3511 }
3512 
3513 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3514 
3515 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3516                                                      struct dasd_block *block,
3517                                                      struct request *req)
3518 {
3519         struct dasd_eckd_private *private;
3520         struct dasd_device *startdev;
3521         unsigned long flags;
3522         struct dasd_ccw_req *cqr;
3523 
3524         startdev = dasd_alias_get_start_dev(base);
3525         if (!startdev)
3526                 startdev = base;
3527         private = (struct dasd_eckd_private *) startdev->private;
3528         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3529                 return ERR_PTR(-EBUSY);
3530 
3531         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3532         private->count++;
3533         if ((base->features & DASD_FEATURE_USERAW))
3534                 cqr = dasd_raw_build_cp(startdev, block, req);
3535         else
3536                 cqr = dasd_eckd_build_cp(startdev, block, req);
3537         if (IS_ERR(cqr))
3538                 private->count--;
3539         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3540         return cqr;
3541 }
3542 
3543 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3544                                    struct request *req)
3545 {
3546         struct dasd_eckd_private *private;
3547         unsigned long flags;
3548 
3549         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3550         private = (struct dasd_eckd_private *) cqr->memdev->private;
3551         private->count--;
3552         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3553         return dasd_eckd_free_cp(cqr, req);
3554 }
3555 
3556 static int
3557 dasd_eckd_fill_info(struct dasd_device * device,
3558                     struct dasd_information2_t * info)
3559 {
3560         struct dasd_eckd_private *private;
3561 
3562         private = (struct dasd_eckd_private *) device->private;
3563         info->label_block = 2;
3564         info->FBA_layout = private->uses_cdl ? 0 : 1;
3565         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3566         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3567         memcpy(info->characteristics, &private->rdc_data,
3568                sizeof(struct dasd_eckd_characteristics));
3569         info->confdata_size = min((unsigned long)private->conf_len,
3570                                   sizeof(info->configuration_data));
3571         memcpy(info->configuration_data, private->conf_data,
3572                info->confdata_size);
3573         return 0;
3574 }
3575 
3576 /*
3577  * SECTION: ioctl functions for eckd devices.
3578  */
3579 
3580 /*
3581  * Release device ioctl.
3582  * Buils a channel programm to releases a prior reserved
3583  * (see dasd_eckd_reserve) device.
3584  */
3585 static int
3586 dasd_eckd_release(struct dasd_device *device)
3587 {
3588         struct dasd_ccw_req *cqr;
3589         int rc;
3590         struct ccw1 *ccw;
3591         int useglobal;
3592 
3593         if (!capable(CAP_SYS_ADMIN))
3594                 return -EACCES;
3595 
3596         useglobal = 0;
3597         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3598         if (IS_ERR(cqr)) {
3599                 mutex_lock(&dasd_reserve_mutex);
3600                 useglobal = 1;
3601                 cqr = &dasd_reserve_req->cqr;
3602                 memset(cqr, 0, sizeof(*cqr));
3603                 memset(&dasd_reserve_req->ccw, 0,
3604                        sizeof(dasd_reserve_req->ccw));
3605                 cqr->cpaddr = &dasd_reserve_req->ccw;
3606                 cqr->data = &dasd_reserve_req->data;
3607                 cqr->magic = DASD_ECKD_MAGIC;
3608         }
3609         ccw = cqr->cpaddr;
3610         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3611         ccw->flags |= CCW_FLAG_SLI;
3612         ccw->count = 32;
3613         ccw->cda = (__u32)(addr_t) cqr->data;
3614         cqr->startdev = device;
3615         cqr->memdev = device;
3616         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3617         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3618         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3619         cqr->expires = 2 * HZ;
3620         cqr->buildclk = get_tod_clock();
3621         cqr->status = DASD_CQR_FILLED;
3622 
3623         rc = dasd_sleep_on_immediatly(cqr);
3624         if (!rc)
3625                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3626 
3627         if (useglobal)
3628                 mutex_unlock(&dasd_reserve_mutex);
3629         else
3630                 dasd_sfree_request(cqr, cqr->memdev);
3631         return rc;
3632 }
3633 
3634 /*
3635  * Reserve device ioctl.
3636  * Options are set to 'synchronous wait for interrupt' and
3637  * 'timeout the request'. This leads to a terminate IO if
3638  * the interrupt is outstanding for a certain time.
3639  */
3640 static int
3641 dasd_eckd_reserve(struct dasd_device *device)
3642 {
3643         struct dasd_ccw_req *cqr;
3644         int rc;
3645         struct ccw1 *ccw;
3646         int useglobal;
3647 
3648         if (!capable(CAP_SYS_ADMIN))
3649                 return -EACCES;
3650 
3651         useglobal = 0;
3652         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3653         if (IS_ERR(cqr)) {
3654                 mutex_lock(&dasd_reserve_mutex);
3655                 useglobal = 1;
3656                 cqr = &dasd_reserve_req->cqr;
3657                 memset(cqr, 0, sizeof(*cqr));
3658                 memset(&dasd_reserve_req->ccw, 0,
3659                        sizeof(dasd_reserve_req->ccw));
3660                 cqr->cpaddr = &dasd_reserve_req->ccw;
3661                 cqr->data = &dasd_reserve_req->data;
3662                 cqr->magic = DASD_ECKD_MAGIC;
3663         }
3664         ccw = cqr->cpaddr;
3665         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3666         ccw->flags |= CCW_FLAG_SLI;
3667         ccw->count = 32;
3668         ccw->cda = (__u32)(addr_t) cqr->data;
3669         cqr->startdev = device;
3670         cqr->memdev = device;
3671         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3672         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3673         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3674         cqr->expires = 2 * HZ;
3675         cqr->buildclk = get_tod_clock();
3676         cqr->status = DASD_CQR_FILLED;
3677 
3678         rc = dasd_sleep_on_immediatly(cqr);
3679         if (!rc)
3680                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3681 
3682         if (useglobal)
3683                 mutex_unlock(&dasd_reserve_mutex);
3684         else
3685                 dasd_sfree_request(cqr, cqr->memdev);
3686         return rc;
3687 }
3688 
3689 /*
3690  * Steal lock ioctl - unconditional reserve device.
3691  * Buils a channel programm to break a device's reservation.
3692  * (unconditional reserve)
3693  */
3694 static int
3695 dasd_eckd_steal_lock(struct dasd_device *device)
3696 {
3697         struct dasd_ccw_req *cqr;
3698         int rc;
3699         struct ccw1 *ccw;
3700         int useglobal;
3701 
3702         if (!capable(CAP_SYS_ADMIN))
3703                 return -EACCES;
3704 
3705         useglobal = 0;
3706         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3707         if (IS_ERR(cqr)) {
3708                 mutex_lock(&dasd_reserve_mutex);
3709                 useglobal = 1;
3710                 cqr = &dasd_reserve_req->cqr;
3711                 memset(cqr, 0, sizeof(*cqr));
3712                 memset(&dasd_reserve_req->ccw, 0,
3713                        sizeof(dasd_reserve_req->ccw));
3714                 cqr->cpaddr = &dasd_reserve_req->ccw;
3715                 cqr->data = &dasd_reserve_req->data;
3716                 cqr->magic = DASD_ECKD_MAGIC;
3717         }
3718         ccw = cqr->cpaddr;
3719         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3720         ccw->flags |= CCW_FLAG_SLI;
3721         ccw->count = 32;
3722         ccw->cda = (__u32)(addr_t) cqr->data;
3723         cqr->startdev = device;
3724         cqr->memdev = device;
3725         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3726         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3727         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3728         cqr->expires = 2 * HZ;
3729         cqr->buildclk = get_tod_clock();
3730         cqr->status = DASD_CQR_FILLED;
3731 
3732         rc = dasd_sleep_on_immediatly(cqr);
3733         if (!rc)
3734                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3735 
3736         if (useglobal)
3737                 mutex_unlock(&dasd_reserve_mutex);
3738         else
3739                 dasd_sfree_request(cqr, cqr->memdev);
3740         return rc;
3741 }
3742 
3743 /*
3744  * SNID - Sense Path Group ID
3745  * This ioctl may be used in situations where I/O is stalled due to
3746  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3747  * preallocated dasd_reserve_req.
3748  */
3749 static int dasd_eckd_snid(struct dasd_device *device,
3750                           void __user *argp)
3751 {
3752         struct dasd_ccw_req *cqr;
3753         int rc;
3754         struct ccw1 *ccw;
3755         int useglobal;
3756         struct dasd_snid_ioctl_data usrparm;
3757 
3758         if (!capable(CAP_SYS_ADMIN))
3759                 return -EACCES;
3760 
3761         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3762                 return -EFAULT;
3763 
3764         useglobal = 0;
3765         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3766                                    sizeof(struct dasd_snid_data), device);
3767         if (IS_ERR(cqr)) {
3768                 mutex_lock(&dasd_reserve_mutex);
3769                 useglobal = 1;
3770                 cqr = &dasd_reserve_req->cqr;
3771                 memset(cqr, 0, sizeof(*cqr));
3772                 memset(&dasd_reserve_req->ccw, 0,
3773                        sizeof(dasd_reserve_req->ccw));
3774                 cqr->cpaddr = &dasd_reserve_req->ccw;
3775                 cqr->data = &dasd_reserve_req->data;
3776                 cqr->magic = DASD_ECKD_MAGIC;
3777         }
3778         ccw = cqr->cpaddr;
3779         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3780         ccw->flags |= CCW_FLAG_SLI;
3781         ccw->count = 12;
3782         ccw->cda = (__u32)(addr_t) cqr->data;
3783         cqr->startdev = device;
3784         cqr->memdev = device;
3785         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3786         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3787         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3788         cqr->retries = 5;
3789         cqr->expires = 10 * HZ;
3790         cqr->buildclk = get_tod_clock();
3791         cqr->status = DASD_CQR_FILLED;
3792         cqr->lpm = usrparm.path_mask;
3793 
3794         rc = dasd_sleep_on_immediatly(cqr);
3795         /* verify that I/O processing didn't modify the path mask */
3796         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3797                 rc = -EIO;
3798         if (!rc) {
3799                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3800                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3801                         rc = -EFAULT;
3802         }
3803 
3804         if (useglobal)
3805                 mutex_unlock(&dasd_reserve_mutex);
3806         else
3807                 dasd_sfree_request(cqr, cqr->memdev);
3808         return rc;
3809 }
3810 
3811 /*
3812  * Read performance statistics
3813  */
3814 static int
3815 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3816 {
3817         struct dasd_psf_prssd_data *prssdp;
3818         struct dasd_rssd_perf_stats_t *stats;
3819         struct dasd_ccw_req *cqr;
3820         struct ccw1 *ccw;
3821         int rc;
3822 
3823         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3824                                    (sizeof(struct dasd_psf_prssd_data) +
3825                                     sizeof(struct dasd_rssd_perf_stats_t)),
3826                                    device);
3827         if (IS_ERR(cqr)) {
3828                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3829                             "Could not allocate initialization request");
3830                 return PTR_ERR(cqr);
3831         }
3832         cqr->startdev = device;
3833         cqr->memdev = device;
3834         cqr->retries = 0;
3835         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3836         cqr->expires = 10 * HZ;
3837 
3838         /* Prepare for Read Subsystem Data */
3839         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3840         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3841         prssdp->order = PSF_ORDER_PRSSD;
3842         prssdp->suborder = 0x01;        /* Performance Statistics */
3843         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3844 
3845         ccw = cqr->cpaddr;
3846         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3847         ccw->count = sizeof(struct dasd_psf_prssd_data);
3848         ccw->flags |= CCW_FLAG_CC;
3849         ccw->cda = (__u32)(addr_t) prssdp;
3850 
3851         /* Read Subsystem Data - Performance Statistics */
3852         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3853         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3854 
3855         ccw++;
3856         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3857         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3858         ccw->cda = (__u32)(addr_t) stats;
3859 
3860         cqr->buildclk = get_tod_clock();
3861         cqr->status = DASD_CQR_FILLED;
3862         rc = dasd_sleep_on(cqr);
3863         if (rc == 0) {
3864                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3865                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3866                 if (copy_to_user(argp, stats,
3867                                  sizeof(struct dasd_rssd_perf_stats_t)))
3868                         rc = -EFAULT;
3869         }
3870         dasd_sfree_request(cqr, cqr->memdev);
3871         return rc;
3872 }
3873 
3874 /*
3875  * Get attributes (cache operations)
3876  * Returnes the cache attributes used in Define Extend (DE).
3877  */
3878 static int
3879 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3880 {
3881         struct dasd_eckd_private *private =
3882                 (struct dasd_eckd_private *)device->private;
3883         struct attrib_data_t attrib = private->attrib;
3884         int rc;
3885 
3886         if (!capable(CAP_SYS_ADMIN))
3887                 return -EACCES;
3888         if (!argp)
3889                 return -EINVAL;
3890 
3891         rc = 0;
3892         if (copy_to_user(argp, (long *) &attrib,
3893                          sizeof(struct attrib_data_t)))
3894                 rc = -EFAULT;
3895 
3896         return rc;
3897 }
3898 
3899 /*
3900  * Set attributes (cache operations)
3901  * Stores the attributes for cache operation to be used in Define Extend (DE).
3902  */
3903 static int
3904 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3905 {
3906         struct dasd_eckd_private *private =
3907                 (struct dasd_eckd_private *)device->private;
3908         struct attrib_data_t attrib;
3909 
3910         if (!capable(CAP_SYS_ADMIN))
3911                 return -EACCES;
3912         if (!argp)
3913                 return -EINVAL;
3914 
3915         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3916                 return -EFAULT;
3917         private->attrib = attrib;
3918 
3919         dev_info(&device->cdev->dev,
3920                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3921                  private->attrib.operation, private->attrib.nr_cyl);
3922         return 0;
3923 }
3924 
3925 /*
3926  * Issue syscall I/O to EMC Symmetrix array.
3927  * CCWs are PSF and RSSD
3928  */
3929 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3930 {
3931         struct dasd_symmio_parms usrparm;
3932         char *psf_data, *rssd_result;
3933         struct dasd_ccw_req *cqr;
3934         struct ccw1 *ccw;
3935         char psf0, psf1;
3936         int rc;
3937 
3938         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3939                 return -EACCES;
3940         psf0 = psf1 = 0;
3941 
3942         /* Copy parms from caller */
3943         rc = -EFAULT;
3944         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3945                 goto out;
3946         if (is_compat_task() || sizeof(long) == 4) {
3947                 /* Make sure pointers are sane even on 31 bit. */
3948                 rc = -EINVAL;
3949                 if ((usrparm.psf_data >> 32) != 0)
3950                         goto out;
3951                 if ((usrparm.rssd_result >> 32) != 0)
3952                         goto out;
3953                 usrparm.psf_data &= 0x7fffffffULL;
3954                 usrparm.rssd_result &= 0x7fffffffULL;
3955         }
3956         /* alloc I/O data area */
3957         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3958         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3959         if (!psf_data || !rssd_result) {
3960                 rc = -ENOMEM;
3961                 goto out_free;
3962         }
3963 
3964         /* get syscall header from user space */
3965         rc = -EFAULT;
3966         if (copy_from_user(psf_data,
3967                            (void __user *)(unsigned long) usrparm.psf_data,
3968                            usrparm.psf_data_len))
3969                 goto out_free;
3970         psf0 = psf_data[0];
3971         psf1 = psf_data[1];
3972 
3973         /* setup CCWs for PSF + RSSD */
3974         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3975         if (IS_ERR(cqr)) {
3976                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3977                         "Could not allocate initialization request");
3978                 rc = PTR_ERR(cqr);
3979                 goto out_free;
3980         }
3981 
3982         cqr->startdev = device;
3983         cqr->memdev = device;
3984         cqr->retries = 3;
3985         cqr->expires = 10 * HZ;
3986         cqr->buildclk = get_tod_clock();
3987         cqr->status = DASD_CQR_FILLED;
3988 
3989         /* Build the ccws */
3990         ccw = cqr->cpaddr;
3991 
3992         /* PSF ccw */
3993         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3994         ccw->count = usrparm.psf_data_len;
3995         ccw->flags |= CCW_FLAG_CC;
3996         ccw->cda = (__u32)(addr_t) psf_data;
3997 
3998         ccw++;
3999 
4000         /* RSSD ccw  */
4001         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4002         ccw->count = usrparm.rssd_result_len;
4003         ccw->flags = CCW_FLAG_SLI ;
4004         ccw->cda = (__u32)(addr_t) rssd_result;
4005 
4006         rc = dasd_sleep_on(cqr);
4007         if (rc)
4008                 goto out_sfree;
4009 
4010         rc = -EFAULT;
4011         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4012                            rssd_result, usrparm.rssd_result_len))
4013                 goto out_sfree;
4014         rc = 0;
4015 
4016 out_sfree:
4017         dasd_sfree_request(cqr, cqr->memdev);
4018 out_free:
4019         kfree(rssd_result);
4020         kfree(psf_data);
4021 out:
4022         DBF_DEV_EVENT(DBF_WARNING, device,
4023                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4024                       (int) psf0, (int) psf1, rc);
4025         return rc;
4026 }
4027 
4028 static int
4029 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4030 {
4031         struct dasd_device *device = block->base;
4032 
4033         switch (cmd) {
4034         case BIODASDGATTR:
4035                 return dasd_eckd_get_attrib(device, argp);
4036         case BIODASDSATTR:
4037                 return dasd_eckd_set_attrib(device, argp);
4038         case BIODASDPSRD:
4039                 return dasd_eckd_performance(device, argp);
4040         case BIODASDRLSE:
4041                 return dasd_eckd_release(device);
4042         case BIODASDRSRV:
4043                 return dasd_eckd_reserve(device);
4044         case BIODASDSLCK:
4045                 return dasd_eckd_steal_lock(device);
4046         case BIODASDSNID:
4047                 return dasd_eckd_snid(device, argp);
4048         case BIODASDSYMMIO:
4049                 return dasd_symm_io(device, argp);
4050         default:
4051                 return -ENOTTY;
4052         }
4053 }
4054 
4055 /*
4056  * Dump the range of CCWs into 'page' buffer
4057  * and return number of printed chars.
4058  */
4059 static int
4060 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4061 {
4062         int len, count;
4063         char *datap;
4064 
4065         len = 0;
4066         while (from <= to) {
4067                 len += sprintf(page + len, PRINTK_HEADER
4068                                " CCW %p: %08X %08X DAT:",
4069                                from, ((int *) from)[0], ((int *) from)[1]);
4070 
4071                 /* get pointer to data (consider IDALs) */
4072                 if (from->flags & CCW_FLAG_IDA)
4073                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4074                 else
4075                         datap = (char *) ((addr_t) from->cda);
4076 
4077                 /* dump data (max 32 bytes) */
4078                 for (count = 0; count < from->count && count < 32; count++) {
4079                         if (count % 8 == 0) len += sprintf(page + len, " ");
4080                         if (count % 4 == 0) len += sprintf(page + len, " ");
4081                         len += sprintf(page + len, "%02x", datap[count]);
4082                 }
4083                 len += sprintf(page + len, "\n");
4084                 from++;
4085         }
4086         return len;
4087 }
4088 
4089 static void
4090 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4091                          char *reason)
4092 {
4093         u64 *sense;
4094         u64 *stat;
4095 
4096         sense = (u64 *) dasd_get_sense(irb);
4097         stat = (u64 *) &irb->scsw;
4098         if (sense) {
4099                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4100                               "%016llx %016llx %016llx %016llx",
4101                               reason, *stat, *((u32 *) (stat + 1)),
4102                               sense[0], sense[1], sense[2], sense[3]);
4103         } else {
4104                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4105                               reason, *stat, *((u32 *) (stat + 1)),
4106                               "NO VALID SENSE");
4107         }
4108 }
4109 
4110 /*
4111  * Print sense data and related channel program.
4112  * Parts are printed because printk buffer is only 1024 bytes.
4113  */
4114 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4115                                  struct dasd_ccw_req *req, struct irb *irb)
4116 {
4117         char *page;
4118         struct ccw1 *first, *last, *fail, *from, *to;
4119         int len, sl, sct;
4120 
4121         page = (char *) get_zeroed_page(GFP_ATOMIC);
4122         if (page == NULL) {
4123                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4124                               "No memory to dump sense data\n");
4125                 return;
4126         }
4127         /* dump the sense data */
4128         len = sprintf(page, PRINTK_HEADER
4129                       " I/O status report for device %s:\n",
4130                       dev_name(&device->cdev->dev));
4131         len += sprintf(page + len, PRINTK_HEADER
4132                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4133                        "CS:%02X RC:%d\n",
4134                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4135                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4136                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4137                        req ? req->intrc : 0);
4138         len += sprintf(page + len, PRINTK_HEADER
4139                        " device %s: Failing CCW: %p\n",
4140                        dev_name(&device->cdev->dev),
4141                        (void *) (addr_t) irb->scsw.cmd.cpa);
4142         if (irb->esw.esw0.erw.cons) {
4143                 for (sl = 0; sl < 4; sl++) {
4144                         len += sprintf(page + len, PRINTK_HEADER
4145                                        " Sense(hex) %2d-%2d:",
4146                                        (8 * sl), ((8 * sl) + 7));
4147 
4148                         for (sct = 0; sct < 8; sct++) {
4149                                 len += sprintf(page + len, " %02x",
4150                                                irb->ecw[8 * sl + sct]);
4151                         }
4152                         len += sprintf(page + len, "\n");
4153                 }
4154 
4155                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4156                         /* 24 Byte Sense Data */
4157                         sprintf(page + len, PRINTK_HEADER
4158                                 " 24 Byte: %x MSG %x, "
4159                                 "%s MSGb to SYSOP\n",
4160                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4161                                 irb->ecw[1] & 0x10 ? "" : "no");
4162                 } else {
4163                         /* 32 Byte Sense Data */
4164                         sprintf(page + len, PRINTK_HEADER
4165                                 " 32 Byte: Format: %x "
4166                                 "Exception class %x\n",
4167                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4168                 }
4169         } else {
4170                 sprintf(page + len, PRINTK_HEADER
4171                         " SORRY - NO VALID SENSE AVAILABLE\n");
4172         }
4173         printk(KERN_ERR "%s", page);
4174 
4175         if (req) {
4176                 /* req == NULL for unsolicited interrupts */
4177                 /* dump the Channel Program (max 140 Bytes per line) */
4178                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4179                 first = req->cpaddr;
4180                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4181                 to = min(first + 6, last);
4182                 len = sprintf(page, PRINTK_HEADER
4183                               " Related CP in req: %p\n", req);
4184                 dasd_eckd_dump_ccw_range(first, to, page + len);
4185                 printk(KERN_ERR "%s", page);
4186 
4187                 /* print failing CCW area (maximum 4) */
4188                 /* scsw->cda is either valid or zero  */
4189                 len = 0;
4190                 from = ++to;
4191                 fail = (struct ccw1 *)(addr_t)
4192                                 irb->scsw.cmd.cpa; /* failing CCW */
4193                 if (from <  fail - 2) {
4194                         from = fail - 2;     /* there is a gap - print header */
4195                         len += sprintf(page, PRINTK_HEADER "......\n");
4196                 }
4197                 to = min(fail + 1, last);
4198                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4199 
4200                 /* print last CCWs (maximum 2) */
4201                 from = max(from, ++to);
4202                 if (from < last - 1) {
4203                         from = last - 1;     /* there is a gap - print header */
4204                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4205                 }
4206                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4207                 if (len > 0)
4208                         printk(KERN_ERR "%s", page);
4209         }
4210         free_page((unsigned long) page);
4211 }
4212 
4213 
4214 /*
4215  * Print sense data from a tcw.
4216  */
4217 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4218                                  struct dasd_ccw_req *req, struct irb *irb)
4219 {
4220         char *page;
4221         int len, sl, sct, residual;
4222         struct tsb *tsb;
4223         u8 *sense, *rcq;
4224 
4225         page = (char *) get_zeroed_page(GFP_ATOMIC);
4226         if (page == NULL) {
4227                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4228                             "No memory to dump sense data");
4229                 return;
4230         }
4231         /* dump the sense data */
4232         len = sprintf(page, PRINTK_HEADER
4233                       " I/O status report for device %s:\n",
4234                       dev_name(&device->cdev->dev));
4235         len += sprintf(page + len, PRINTK_HEADER
4236                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4237                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4238                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4239                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4240                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4241                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4242                        req ? req->intrc : 0);
4243         len += sprintf(page + len, PRINTK_HEADER
4244                        " device %s: Failing TCW: %p\n",
4245                        dev_name(&device->cdev->dev),
4246                        (void *) (addr_t) irb->scsw.tm.tcw);
4247 
4248         tsb = NULL;
4249         sense = NULL;
4250         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4251                 tsb = tcw_get_tsb(
4252                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4253 
4254         if (tsb) {
4255                 len += sprintf(page + len, PRINTK_HEADER
4256                                " tsb->length %d\n", tsb->length);
4257                 len += sprintf(page + len, PRINTK_HEADER
4258                                " tsb->flags %x\n", tsb->flags);
4259                 len += sprintf(page + len, PRINTK_HEADER
4260                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4261                 len += sprintf(page + len, PRINTK_HEADER
4262                                " tsb->count %d\n", tsb->count);
4263                 residual = tsb->count - 28;
4264                 len += sprintf(page + len, PRINTK_HEADER
4265                                " residual %d\n", residual);
4266 
4267                 switch (tsb->flags & 0x07) {
4268                 case 1: /* tsa_iostat */
4269                         len += sprintf(page + len, PRINTK_HEADER
4270                                " tsb->tsa.iostat.dev_time %d\n",
4271                                        tsb->tsa.iostat.dev_time);
4272                         len += sprintf(page + len, PRINTK_HEADER
4273                                " tsb->tsa.iostat.def_time %d\n",
4274                                        tsb->tsa.iostat.def_time);
4275                         len += sprintf(page + len, PRINTK_HEADER
4276                                " tsb->tsa.iostat.queue_time %d\n",
4277                                        tsb->tsa.iostat.queue_time);
4278                         len += sprintf(page + len, PRINTK_HEADER
4279                                " tsb->tsa.iostat.dev_busy_time %d\n",
4280                                        tsb->tsa.iostat.dev_busy_time);
4281                         len += sprintf(page + len, PRINTK_HEADER
4282                                " tsb->tsa.iostat.dev_act_time %d\n",
4283                                        tsb->tsa.iostat.dev_act_time);
4284                         sense = tsb->tsa.iostat.sense;
4285                         break;
4286                 case 2: /* ts_ddpc */
4287                         len += sprintf(page + len, PRINTK_HEADER
4288                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4289                         for (sl = 0; sl < 2; sl++) {
4290                                 len += sprintf(page + len, PRINTK_HEADER
4291                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4292                                                (8 * sl), ((8 * sl) + 7));
4293                                 rcq = tsb->tsa.ddpc.rcq;
4294                                 for (sct = 0; sct < 8; sct++) {
4295                                         len += sprintf(page + len, " %02x",
4296                                                        rcq[8 * sl + sct]);
4297                                 }
4298                                 len += sprintf(page + len, "\n");
4299                         }
4300                         sense = tsb->tsa.ddpc.sense;
4301                         break;
4302                 case 3: /* tsa_intrg */
4303                         len += sprintf(page + len, PRINTK_HEADER
4304                                       " tsb->tsa.intrg.: not supportet yet\n");
4305                         break;
4306                 }
4307 
4308                 if (sense) {
4309                         for (sl = 0; sl < 4; sl++) {
4310                                 len += sprintf(page + len, PRINTK_HEADER
4311                                                " Sense(hex) %2d-%2d:",
4312                                                (8 * sl), ((8 * sl) + 7));
4313                                 for (sct = 0; sct < 8; sct++) {
4314                                         len += sprintf(page + len, " %02x",
4315                                                        sense[8 * sl + sct]);
4316                                 }
4317                                 len += sprintf(page + len, "\n");
4318                         }
4319 
4320                         if (sense[27] & DASD_SENSE_BIT_0) {
4321                                 /* 24 Byte Sense Data */
4322                                 sprintf(page + len, PRINTK_HEADER
4323                                         " 24 Byte: %x MSG %x, "
4324                                         "%s MSGb to SYSOP\n",
4325                                         sense[7] >> 4, sense[7] & 0x0f,
4326                                         sense[1] & 0x10 ? "" : "no");
4327                         } else {
4328                                 /* 32 Byte Sense Data */
4329                                 sprintf(page + len, PRINTK_HEADER
4330                                         " 32 Byte: Format: %x "
4331                                         "Exception class %x\n",
4332                                         sense[6] & 0x0f, sense[22] >> 4);
4333                         }
4334                 } else {
4335                         sprintf(page + len, PRINTK_HEADER
4336                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4337                 }
4338         } else {
4339                 sprintf(page + len, PRINTK_HEADER
4340                         " SORRY - NO TSB DATA AVAILABLE\n");
4341         }
4342         printk(KERN_ERR "%s", page);
4343         free_page((unsigned long) page);
4344 }
4345 
4346 static void dasd_eckd_dump_sense(struct dasd_device *device,
4347                                  struct dasd_ccw_req *req, struct irb *irb)
4348 {
4349         if (scsw_is_tm(&irb->scsw))
4350                 dasd_eckd_dump_sense_tcw(device, req, irb);
4351         else
4352                 dasd_eckd_dump_sense_ccw(device, req, irb);
4353 }
4354 
4355 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4356 {
4357         /*
4358          * the device should be disconnected from our LCU structure
4359          * on restore we will reconnect it and reread LCU specific
4360          * information like PAV support that might have changed
4361          */
4362         dasd_alias_remove_device(device);
4363         dasd_alias_disconnect_device_from_lcu(device);
4364 
4365         return 0;
4366 }
4367 
4368 static int dasd_eckd_restore_device(struct dasd_device *device)
4369 {
4370         struct dasd_eckd_private *private;
4371         struct dasd_eckd_characteristics temp_rdc_data;
4372         int rc;
4373         struct dasd_uid temp_uid;
4374         unsigned long flags;
4375         unsigned long cqr_flags = 0;
4376 
4377         private = (struct dasd_eckd_private *) device->private;
4378 
4379         /* Read Configuration Data */
4380         dasd_eckd_read_conf(device);
4381 
4382         dasd_eckd_get_uid(device, &temp_uid);
4383         /* Generate device unique id */
4384         rc = dasd_eckd_generate_uid(device);
4385         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4386         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4387                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4388                         "changed\n");
4389         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4390         if (rc)
4391                 goto out_err;
4392 
4393         /* register lcu with alias handling, enable PAV if this is a new lcu */
4394         rc = dasd_alias_make_device_known_to_lcu(device);
4395         if (rc)
4396                 return rc;
4397 
4398         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4399         dasd_eckd_validate_server(device, cqr_flags);
4400 
4401         /* RE-Read Configuration Data */
4402         dasd_eckd_read_conf(device);
4403 
4404         /* Read Feature Codes */
4405         dasd_eckd_read_features(device);
4406 
4407         /* Read Device Characteristics */
4408         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4409                                          &temp_rdc_data, 64);
4410         if (rc) {
4411                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4412                                 "Read device characteristic failed, rc=%d", rc);
4413                 goto out_err;
4414         }
4415         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4416         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4417         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4418 
4419         /* add device to alias management */
4420         dasd_alias_add_device(device);
4421 
4422         return 0;
4423 
4424 out_err:
4425         return -1;
4426 }
4427 
4428 static int dasd_eckd_reload_device(struct dasd_device *device)
4429 {
4430         struct dasd_eckd_private *private;
4431         int rc, old_base;
4432         char print_uid[60];
4433         struct dasd_uid uid;
4434         unsigned long flags;
4435 
4436         private = (struct dasd_eckd_private *) device->private;
4437 
4438         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4439         old_base = private->uid.base_unit_addr;
4440         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4441 
4442         /* Read Configuration Data */
4443         rc = dasd_eckd_read_conf(device);
4444         if (rc)
4445                 goto out_err;
4446 
4447         rc = dasd_eckd_generate_uid(device);
4448         if (rc)
4449                 goto out_err;
4450         /*
4451          * update unit address configuration and
4452          * add device to alias management
4453          */
4454         dasd_alias_update_add_device(device);
4455 
4456         dasd_eckd_get_uid(device, &uid);
4457 
4458         if (old_base != uid.base_unit_addr) {
4459                 if (strlen(uid.vduit) > 0)
4460                         snprintf(print_uid, sizeof(print_uid),
4461                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4462                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4463                 else
4464                         snprintf(print_uid, sizeof(print_uid),
4465                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4466                                  uid.ssid, uid.base_unit_addr);
4467 
4468                 dev_info(&device->cdev->dev,
4469                          "An Alias device was reassigned to a new base device "
4470                          "with UID: %s\n", print_uid);
4471         }
4472         return 0;
4473 
4474 out_err:
4475         return -1;
4476 }
4477 
4478 static struct ccw_driver dasd_eckd_driver = {
4479         .driver = {
4480                 .name   = "dasd-eckd",
4481                 .owner  = THIS_MODULE,
4482         },
4483         .ids         = dasd_eckd_ids,
4484         .probe       = dasd_eckd_probe,
4485         .remove      = dasd_generic_remove,
4486         .set_offline = dasd_generic_set_offline,
4487         .set_online  = dasd_eckd_set_online,
4488         .notify      = dasd_generic_notify,
4489         .path_event  = dasd_generic_path_event,
4490         .shutdown    = dasd_generic_shutdown,
4491         .freeze      = dasd_generic_pm_freeze,
4492         .thaw        = dasd_generic_restore_device,
4493         .restore     = dasd_generic_restore_device,
4494         .uc_handler  = dasd_generic_uc_handler,
4495         .int_class   = IRQIO_DAS,
4496 };
4497 
4498 /*
4499  * max_blocks is dependent on the amount of storage that is available
4500  * in the static io buffer for each device. Currently each device has
4501  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4502  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4503  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4504  * addition we have one define extent ccw + 16 bytes of data and one
4505  * locate record ccw + 16 bytes of data. That makes:
4506  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4507  * We want to fit two into the available memory so that we can immediately
4508  * start the next request if one finishes off. That makes 249.5 blocks
4509  * for one request. Give a little safety and the result is 240.
4510  */
4511 static struct dasd_discipline dasd_eckd_discipline = {
4512         .owner = THIS_MODULE,
4513         .name = "ECKD",
4514         .ebcname = "ECKD",
4515         .max_blocks = 190,
4516         .check_device = dasd_eckd_check_characteristics,
4517         .uncheck_device = dasd_eckd_uncheck_device,
4518         .do_analysis = dasd_eckd_do_analysis,
4519         .verify_path = dasd_eckd_verify_path,
4520         .basic_to_ready = dasd_eckd_basic_to_ready,
4521         .online_to_ready = dasd_eckd_online_to_ready,
4522         .basic_to_known = dasd_eckd_basic_to_known,
4523         .fill_geometry = dasd_eckd_fill_geometry,
4524         .start_IO = dasd_start_IO,
4525         .term_IO = dasd_term_IO,
4526         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4527         .format_device = dasd_eckd_format_device,
4528         .erp_action = dasd_eckd_erp_action,
4529         .erp_postaction = dasd_eckd_erp_postaction,
4530         .check_for_device_change = dasd_eckd_check_for_device_change,
4531         .build_cp = dasd_eckd_build_alias_cp,
4532         .free_cp = dasd_eckd_free_alias_cp,
4533         .dump_sense = dasd_eckd_dump_sense,
4534         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4535         .fill_info = dasd_eckd_fill_info,
4536         .ioctl = dasd_eckd_ioctl,
4537         .freeze = dasd_eckd_pm_freeze,
4538         .restore = dasd_eckd_restore_device,
4539         .reload = dasd_eckd_reload_device,
4540         .get_uid = dasd_eckd_get_uid,
4541         .kick_validate = dasd_eckd_kick_validate_server,
4542 };
4543 
4544 static int __init
4545 dasd_eckd_init(void)
4546 {
4547         int ret;
4548 
4549         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4550         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4551                                    GFP_KERNEL | GFP_DMA);
4552         if (!dasd_reserve_req)
4553                 return -ENOMEM;
4554         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4555                                    GFP_KERNEL | GFP_DMA);
4556         if (!path_verification_worker) {
4557                 kfree(dasd_reserve_req);
4558                 return -ENOMEM;
4559         }
4560         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
4561         if (!rawpadpage) {
4562                 kfree(path_verification_worker);
4563                 kfree(dasd_reserve_req);
4564                 return -ENOMEM;
4565         }
4566         ret = ccw_driver_register(&dasd_eckd_driver);
4567         if (!ret)
4568                 wait_for_device_probe();
4569         else {
4570                 kfree(path_verification_worker);
4571                 kfree(dasd_reserve_req);
4572                 free_page((unsigned long)rawpadpage);
4573         }
4574         return ret;
4575 }
4576 
4577 static void __exit
4578 dasd_eckd_cleanup(void)
4579 {
4580         ccw_driver_unregister(&dasd_eckd_driver);
4581         kfree(path_verification_worker);
4582         kfree(dasd_reserve_req);
4583         free_page((unsigned long)rawpadpage);
4584 }
4585 
4586 module_init(dasd_eckd_init);
4587 module_exit(dasd_eckd_cleanup);
4588 

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