Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 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

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_ready_to_basic(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 {
2066         struct dasd_eckd_private *base_priv;
2067         struct dasd_eckd_private *start_priv;
2068         struct dasd_device *startdev;
2069         struct dasd_ccw_req *fcp;
2070         struct eckd_count *ect;
2071         struct ch_t address;
2072         struct ccw1 *ccw;
2073         void *data;
2074         int rpt;
2075         int cplength, datasize;
2076         int i, j;
2077         int intensity = 0;
2078         int r0_perm;
2079         int nr_tracks;
2080         int use_prefix;
2081 
2082         startdev = dasd_alias_get_start_dev(base);
2083         if (!startdev)
2084                 startdev = base;
2085 
2086         start_priv = (struct dasd_eckd_private *) startdev->private;
2087         base_priv = (struct dasd_eckd_private *) base->private;
2088 
2089         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2090 
2091         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2092 
2093         /*
2094          * fdata->intensity is a bit string that tells us what to do:
2095          *   Bit 0: write record zero
2096          *   Bit 1: write home address, currently not supported
2097          *   Bit 2: invalidate tracks
2098          *   Bit 3: use OS/390 compatible disk layout (cdl)
2099          *   Bit 4: do not allow storage subsystem to modify record zero
2100          * Only some bit combinations do make sense.
2101          */
2102         if (fdata->intensity & 0x10) {
2103                 r0_perm = 0;
2104                 intensity = fdata->intensity & ~0x10;
2105         } else {
2106                 r0_perm = 1;
2107                 intensity = fdata->intensity;
2108         }
2109 
2110         use_prefix = base_priv->features.feature[8] & 0x01;
2111 
2112         switch (intensity) {
2113         case 0x00:      /* Normal format */
2114         case 0x08:      /* Normal format, use cdl. */
2115                 cplength = 2 + (rpt*nr_tracks);
2116                 if (use_prefix)
2117                         datasize = sizeof(struct PFX_eckd_data) +
2118                                 sizeof(struct LO_eckd_data) +
2119                                 rpt * nr_tracks * sizeof(struct eckd_count);
2120                 else
2121                         datasize = sizeof(struct DE_eckd_data) +
2122                                 sizeof(struct LO_eckd_data) +
2123                                 rpt * nr_tracks * sizeof(struct eckd_count);
2124                 break;
2125         case 0x01:      /* Write record zero and format track. */
2126         case 0x09:      /* Write record zero and format track, use cdl. */
2127                 cplength = 2 + rpt * nr_tracks;
2128                 if (use_prefix)
2129                         datasize = sizeof(struct PFX_eckd_data) +
2130                                 sizeof(struct LO_eckd_data) +
2131                                 sizeof(struct eckd_count) +
2132                                 rpt * nr_tracks * sizeof(struct eckd_count);
2133                 else
2134                         datasize = sizeof(struct DE_eckd_data) +
2135                                 sizeof(struct LO_eckd_data) +
2136                                 sizeof(struct eckd_count) +
2137                                 rpt * nr_tracks * sizeof(struct eckd_count);
2138                 break;
2139         case 0x04:      /* Invalidate track. */
2140         case 0x0c:      /* Invalidate track, use cdl. */
2141                 cplength = 3;
2142                 if (use_prefix)
2143                         datasize = sizeof(struct PFX_eckd_data) +
2144                                 sizeof(struct LO_eckd_data) +
2145                                 sizeof(struct eckd_count);
2146                 else
2147                         datasize = sizeof(struct DE_eckd_data) +
2148                                 sizeof(struct LO_eckd_data) +
2149                                 sizeof(struct eckd_count);
2150                 break;
2151         default:
2152                 dev_warn(&startdev->cdev->dev,
2153                          "An I/O control call used incorrect flags 0x%x\n",
2154                          fdata->intensity);
2155                 return ERR_PTR(-EINVAL);
2156         }
2157         /* Allocate the format ccw request. */
2158         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2159                                    datasize, startdev);
2160         if (IS_ERR(fcp))
2161                 return fcp;
2162 
2163         start_priv->count++;
2164         data = fcp->data;
2165         ccw = fcp->cpaddr;
2166 
2167         switch (intensity & ~0x08) {
2168         case 0x00: /* Normal format. */
2169                 if (use_prefix) {
2170                         prefix(ccw++, (struct PFX_eckd_data *) data,
2171                                fdata->start_unit, fdata->stop_unit,
2172                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2173                         /* grant subsystem permission to format R0 */
2174                         if (r0_perm)
2175                                 ((struct PFX_eckd_data *)data)
2176                                         ->define_extent.ga_extended |= 0x04;
2177                         data += sizeof(struct PFX_eckd_data);
2178                 } else {
2179                         define_extent(ccw++, (struct DE_eckd_data *) data,
2180                                       fdata->start_unit, fdata->stop_unit,
2181                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2182                         /* grant subsystem permission to format R0 */
2183                         if (r0_perm)
2184                                 ((struct DE_eckd_data *) data)
2185                                         ->ga_extended |= 0x04;
2186                         data += sizeof(struct DE_eckd_data);
2187                 }
2188                 ccw[-1].flags |= CCW_FLAG_CC;
2189                 locate_record(ccw++, (struct LO_eckd_data *) data,
2190                               fdata->start_unit, 0, rpt*nr_tracks,
2191                               DASD_ECKD_CCW_WRITE_CKD, base,
2192                               fdata->blksize);
2193                 data += sizeof(struct LO_eckd_data);
2194                 break;
2195         case 0x01: /* Write record zero + format track. */
2196                 if (use_prefix) {
2197                         prefix(ccw++, (struct PFX_eckd_data *) data,
2198                                fdata->start_unit, fdata->stop_unit,
2199                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2200                                base, startdev);
2201                         data += sizeof(struct PFX_eckd_data);
2202                 } else {
2203                         define_extent(ccw++, (struct DE_eckd_data *) data,
2204                                fdata->start_unit, fdata->stop_unit,
2205                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2206                         data += sizeof(struct DE_eckd_data);
2207                 }
2208                 ccw[-1].flags |= CCW_FLAG_CC;
2209                 locate_record(ccw++, (struct LO_eckd_data *) data,
2210                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2211                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2212                               base->block->bp_block);
2213                 data += sizeof(struct LO_eckd_data);
2214                 break;
2215         case 0x04: /* Invalidate track. */
2216                 if (use_prefix) {
2217                         prefix(ccw++, (struct PFX_eckd_data *) data,
2218                                fdata->start_unit, fdata->stop_unit,
2219                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2220                         data += sizeof(struct PFX_eckd_data);
2221                 } else {
2222                         define_extent(ccw++, (struct DE_eckd_data *) data,
2223                                fdata->start_unit, fdata->stop_unit,
2224                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2225                         data += sizeof(struct DE_eckd_data);
2226                 }
2227                 ccw[-1].flags |= CCW_FLAG_CC;
2228                 locate_record(ccw++, (struct LO_eckd_data *) data,
2229                               fdata->start_unit, 0, 1,
2230                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2231                 data += sizeof(struct LO_eckd_data);
2232                 break;
2233         }
2234 
2235         for (j = 0; j < nr_tracks; j++) {
2236                 /* calculate cylinder and head for the current track */
2237                 set_ch_t(&address,
2238                          (fdata->start_unit + j) /
2239                          base_priv->rdc_data.trk_per_cyl,
2240                          (fdata->start_unit + j) %
2241                          base_priv->rdc_data.trk_per_cyl);
2242                 if (intensity & 0x01) { /* write record zero */
2243                         ect = (struct eckd_count *) data;
2244                         data += sizeof(struct eckd_count);
2245                         ect->cyl = address.cyl;
2246                         ect->head = address.head;
2247                         ect->record = 0;
2248                         ect->kl = 0;
2249                         ect->dl = 8;
2250                         ccw[-1].flags |= CCW_FLAG_CC;
2251                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2252                         ccw->flags = CCW_FLAG_SLI;
2253                         ccw->count = 8;
2254                         ccw->cda = (__u32)(addr_t) ect;
2255                         ccw++;
2256                 }
2257                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2258                         ect = (struct eckd_count *) data;
2259                         data += sizeof(struct eckd_count);
2260                         ect->cyl = address.cyl;
2261                         ect->head = address.head;
2262                         ect->record = 1;
2263                         ect->kl = 0;
2264                         ect->dl = 0;
2265                         ccw[-1].flags |= CCW_FLAG_CC;
2266                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2267                         ccw->flags = CCW_FLAG_SLI;
2268                         ccw->count = 8;
2269                         ccw->cda = (__u32)(addr_t) ect;
2270                 } else {                /* write remaining records */
2271                         for (i = 0; i < rpt; i++) {
2272                                 ect = (struct eckd_count *) data;
2273                                 data += sizeof(struct eckd_count);
2274                                 ect->cyl = address.cyl;
2275                                 ect->head = address.head;
2276                                 ect->record = i + 1;
2277                                 ect->kl = 0;
2278                                 ect->dl = fdata->blksize;
2279                                 /*
2280                                  * Check for special tracks 0-1
2281                                  * when formatting CDL
2282                                  */
2283                                 if ((intensity & 0x08) &&
2284                                     fdata->start_unit == 0) {
2285                                         if (i < 3) {
2286                                                 ect->kl = 4;
2287                                                 ect->dl = sizes_trk0[i] - 4;
2288                                         }
2289                                 }
2290                                 if ((intensity & 0x08) &&
2291                                     fdata->start_unit == 1) {
2292                                         ect->kl = 44;
2293                                         ect->dl = LABEL_SIZE - 44;
2294                                 }
2295                                 ccw[-1].flags |= CCW_FLAG_CC;
2296                                 if (i != 0 || j == 0)
2297                                         ccw->cmd_code =
2298                                                 DASD_ECKD_CCW_WRITE_CKD;
2299                                 else
2300                                         ccw->cmd_code =
2301                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2302                                 ccw->flags = CCW_FLAG_SLI;
2303                                 ccw->count = 8;
2304                                         ccw->cda = (__u32)(addr_t) ect;
2305                                         ccw++;
2306                         }
2307                 }
2308         }
2309 
2310         fcp->startdev = startdev;
2311         fcp->memdev = startdev;
2312         fcp->retries = 256;
2313         fcp->expires = startdev->default_expires * HZ;
2314         fcp->buildclk = get_tod_clock();
2315         fcp->status = DASD_CQR_FILLED;
2316 
2317         return fcp;
2318 }
2319 
2320 static int
2321 dasd_eckd_format_device(struct dasd_device *base,
2322                         struct format_data_t *fdata)
2323 {
2324         struct dasd_ccw_req *cqr, *n;
2325         struct dasd_block *block;
2326         struct dasd_eckd_private *private;
2327         struct list_head format_queue;
2328         struct dasd_device *device;
2329         int old_stop, format_step;
2330         int step, rc = 0;
2331 
2332         block = base->block;
2333         private = (struct dasd_eckd_private *) base->private;
2334 
2335         /* Sanity checks. */
2336         if (fdata->start_unit >=
2337             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2338                 dev_warn(&base->cdev->dev,
2339                          "Start track number %u used in formatting is too big\n",
2340                          fdata->start_unit);
2341                 return -EINVAL;
2342         }
2343         if (fdata->stop_unit >=
2344             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2345                 dev_warn(&base->cdev->dev,
2346                          "Stop track number %u used in formatting is too big\n",
2347                          fdata->stop_unit);
2348                 return -EINVAL;
2349         }
2350         if (fdata->start_unit > fdata->stop_unit) {
2351                 dev_warn(&base->cdev->dev,
2352                          "Start track %u used in formatting exceeds end track\n",
2353                          fdata->start_unit);
2354                 return -EINVAL;
2355         }
2356         if (dasd_check_blocksize(fdata->blksize) != 0) {
2357                 dev_warn(&base->cdev->dev,
2358                          "The DASD cannot be formatted with block size %u\n",
2359                          fdata->blksize);
2360                 return -EINVAL;
2361         }
2362 
2363         INIT_LIST_HEAD(&format_queue);
2364         old_stop = fdata->stop_unit;
2365 
2366         while (fdata->start_unit <= 1) {
2367                 fdata->stop_unit = fdata->start_unit;
2368                 cqr = dasd_eckd_build_format(base, fdata);
2369                 list_add(&cqr->blocklist, &format_queue);
2370 
2371                 fdata->stop_unit = old_stop;
2372                 fdata->start_unit++;
2373 
2374                 if (fdata->start_unit > fdata->stop_unit)
2375                         goto sleep;
2376         }
2377 
2378 retry:
2379         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2380                                            fdata->blksize);
2381         while (fdata->start_unit <= old_stop) {
2382                 step = fdata->stop_unit - fdata->start_unit + 1;
2383                 if (step > format_step)
2384                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2385 
2386                 cqr = dasd_eckd_build_format(base, fdata);
2387                 if (IS_ERR(cqr)) {
2388                         if (PTR_ERR(cqr) == -ENOMEM) {
2389                                 /*
2390                                  * not enough memory available
2391                                  * go to out and start requests
2392                                  * retry after first requests were finished
2393                                  */
2394                                 fdata->stop_unit = old_stop;
2395                                 goto sleep;
2396                         } else
2397                                 return PTR_ERR(cqr);
2398                 }
2399                 list_add(&cqr->blocklist, &format_queue);
2400 
2401                 fdata->start_unit = fdata->stop_unit + 1;
2402                 fdata->stop_unit = old_stop;
2403         }
2404 
2405 sleep:
2406         dasd_sleep_on_queue(&format_queue);
2407 
2408         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2409                 device = cqr->startdev;
2410                 private = (struct dasd_eckd_private *) device->private;
2411                 if (cqr->status == DASD_CQR_FAILED)
2412                         rc = -EIO;
2413                 list_del_init(&cqr->blocklist);
2414                 dasd_sfree_request(cqr, device);
2415                 private->count--;
2416         }
2417 
2418         /*
2419          * in case of ENOMEM we need to retry after
2420          * first requests are finished
2421          */
2422         if (fdata->start_unit <= fdata->stop_unit)
2423                 goto retry;
2424 
2425         return rc;
2426 }
2427 
2428 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2429 {
2430         if (cqr->retries < 0) {
2431                 cqr->status = DASD_CQR_FAILED;
2432                 return;
2433         }
2434         cqr->status = DASD_CQR_FILLED;
2435         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2436                 dasd_eckd_reset_ccw_to_base_io(cqr);
2437                 cqr->startdev = cqr->block->base;
2438                 cqr->lpm = cqr->block->base->path_data.opm;
2439         }
2440 };
2441 
2442 static dasd_erp_fn_t
2443 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2444 {
2445         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2446         struct ccw_device *cdev = device->cdev;
2447 
2448         switch (cdev->id.cu_type) {
2449         case 0x3990:
2450         case 0x2105:
2451         case 0x2107:
2452         case 0x1750:
2453                 return dasd_3990_erp_action;
2454         case 0x9343:
2455         case 0x3880:
2456         default:
2457                 return dasd_default_erp_action;
2458         }
2459 }
2460 
2461 static dasd_erp_fn_t
2462 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2463 {
2464         return dasd_default_erp_postaction;
2465 }
2466 
2467 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2468                                               struct dasd_ccw_req *cqr,
2469                                               struct irb *irb)
2470 {
2471         char mask;
2472         char *sense = NULL;
2473         struct dasd_eckd_private *private;
2474 
2475         private = (struct dasd_eckd_private *) device->private;
2476         /* first of all check for state change pending interrupt */
2477         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2478         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2479                 /*
2480                  * for alias only, not in offline processing
2481                  * and only if not suspended
2482                  */
2483                 if (!device->block && private->lcu &&
2484                     device->state == DASD_STATE_ONLINE &&
2485                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2486                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2487                         /*
2488                          * the state change could be caused by an alias
2489                          * reassignment remove device from alias handling
2490                          * to prevent new requests from being scheduled on
2491                          * the wrong alias device
2492                          */
2493                         dasd_alias_remove_device(device);
2494 
2495                         /* schedule worker to reload device */
2496                         dasd_reload_device(device);
2497                 }
2498                 dasd_generic_handle_state_change(device);
2499                 return;
2500         }
2501 
2502         sense = dasd_get_sense(irb);
2503         if (!sense)
2504                 return;
2505 
2506         /* summary unit check */
2507         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2508             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2509                 dasd_alias_handle_summary_unit_check(device, irb);
2510                 return;
2511         }
2512 
2513         /* service information message SIM */
2514         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2515             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2516                 dasd_3990_erp_handle_sim(device, sense);
2517                 return;
2518         }
2519 
2520         /* loss of device reservation is handled via base devices only
2521          * as alias devices may be used with several bases
2522          */
2523         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2524             (sense[7] == 0x3F) &&
2525             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2526             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2527                 if (device->features & DASD_FEATURE_FAILONSLCK)
2528                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2529                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2530                 dev_err(&device->cdev->dev,
2531                         "The device reservation was lost\n");
2532         }
2533 }
2534 
2535 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2536                                                struct dasd_device *startdev,
2537                                                struct dasd_block *block,
2538                                                struct request *req,
2539                                                sector_t first_rec,
2540                                                sector_t last_rec,
2541                                                sector_t first_trk,
2542                                                sector_t last_trk,
2543                                                unsigned int first_offs,
2544                                                unsigned int last_offs,
2545                                                unsigned int blk_per_trk,
2546                                                unsigned int blksize)
2547 {
2548         struct dasd_eckd_private *private;
2549         unsigned long *idaws;
2550         struct LO_eckd_data *LO_data;
2551         struct dasd_ccw_req *cqr;
2552         struct ccw1 *ccw;
2553         struct req_iterator iter;
2554         struct bio_vec bv;
2555         char *dst;
2556         unsigned int off;
2557         int count, cidaw, cplength, datasize;
2558         sector_t recid;
2559         unsigned char cmd, rcmd;
2560         int use_prefix;
2561         struct dasd_device *basedev;
2562 
2563         basedev = block->base;
2564         private = (struct dasd_eckd_private *) basedev->private;
2565         if (rq_data_dir(req) == READ)
2566                 cmd = DASD_ECKD_CCW_READ_MT;
2567         else if (rq_data_dir(req) == WRITE)
2568                 cmd = DASD_ECKD_CCW_WRITE_MT;
2569         else
2570                 return ERR_PTR(-EINVAL);
2571 
2572         /* Check struct bio and count the number of blocks for the request. */
2573         count = 0;
2574         cidaw = 0;
2575         rq_for_each_segment(bv, req, iter) {
2576                 if (bv.bv_len & (blksize - 1))
2577                         /* Eckd can only do full blocks. */
2578                         return ERR_PTR(-EINVAL);
2579                 count += bv.bv_len >> (block->s2b_shift + 9);
2580 #if defined(CONFIG_64BIT)
2581                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2582                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
2583 #endif
2584         }
2585         /* Paranoia. */
2586         if (count != last_rec - first_rec + 1)
2587                 return ERR_PTR(-EINVAL);
2588 
2589         /* use the prefix command if available */
2590         use_prefix = private->features.feature[8] & 0x01;
2591         if (use_prefix) {
2592                 /* 1x prefix + number of blocks */
2593                 cplength = 2 + count;
2594                 /* 1x prefix + cidaws*sizeof(long) */
2595                 datasize = sizeof(struct PFX_eckd_data) +
2596                         sizeof(struct LO_eckd_data) +
2597                         cidaw * sizeof(unsigned long);
2598         } else {
2599                 /* 1x define extent + 1x locate record + number of blocks */
2600                 cplength = 2 + count;
2601                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2602                 datasize = sizeof(struct DE_eckd_data) +
2603                         sizeof(struct LO_eckd_data) +
2604                         cidaw * sizeof(unsigned long);
2605         }
2606         /* Find out the number of additional locate record ccws for cdl. */
2607         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2608                 if (last_rec >= 2*blk_per_trk)
2609                         count = 2*blk_per_trk - first_rec;
2610                 cplength += count;
2611                 datasize += count*sizeof(struct LO_eckd_data);
2612         }
2613         /* Allocate the ccw request. */
2614         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2615                                    startdev);
2616         if (IS_ERR(cqr))
2617                 return cqr;
2618         ccw = cqr->cpaddr;
2619         /* First ccw is define extent or prefix. */
2620         if (use_prefix) {
2621                 if (prefix(ccw++, cqr->data, first_trk,
2622                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2623                         /* Clock not in sync and XRC is enabled.
2624                          * Try again later.
2625                          */
2626                         dasd_sfree_request(cqr, startdev);
2627                         return ERR_PTR(-EAGAIN);
2628                 }
2629                 idaws = (unsigned long *) (cqr->data +
2630                                            sizeof(struct PFX_eckd_data));
2631         } else {
2632                 if (define_extent(ccw++, cqr->data, first_trk,
2633                                   last_trk, cmd, basedev) == -EAGAIN) {
2634                         /* Clock not in sync and XRC is enabled.
2635                          * Try again later.
2636                          */
2637                         dasd_sfree_request(cqr, startdev);
2638                         return ERR_PTR(-EAGAIN);
2639                 }
2640                 idaws = (unsigned long *) (cqr->data +
2641                                            sizeof(struct DE_eckd_data));
2642         }
2643         /* Build locate_record+read/write/ccws. */
2644         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2645         recid = first_rec;
2646         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2647                 /* Only standard blocks so there is just one locate record. */
2648                 ccw[-1].flags |= CCW_FLAG_CC;
2649                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2650                               last_rec - recid + 1, cmd, basedev, blksize);
2651         }
2652         rq_for_each_segment(bv, req, iter) {
2653                 dst = page_address(bv.bv_page) + bv.bv_offset;
2654                 if (dasd_page_cache) {
2655                         char *copy = kmem_cache_alloc(dasd_page_cache,
2656                                                       GFP_DMA | __GFP_NOWARN);
2657                         if (copy && rq_data_dir(req) == WRITE)
2658                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2659                         if (copy)
2660                                 dst = copy + bv.bv_offset;
2661                 }
2662                 for (off = 0; off < bv.bv_len; off += blksize) {
2663                         sector_t trkid = recid;
2664                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2665                         rcmd = cmd;
2666                         count = blksize;
2667                         /* Locate record for cdl special block ? */
2668                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2669                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2670                                         rcmd |= 0x8;
2671                                         count = dasd_eckd_cdl_reclen(recid);
2672                                         if (count < blksize &&
2673                                             rq_data_dir(req) == READ)
2674                                                 memset(dst + count, 0xe5,
2675                                                        blksize - count);
2676                                 }
2677                                 ccw[-1].flags |= CCW_FLAG_CC;
2678                                 locate_record(ccw++, LO_data++,
2679                                               trkid, recoffs + 1,
2680                                               1, rcmd, basedev, count);
2681                         }
2682                         /* Locate record for standard blocks ? */
2683                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2684                                 ccw[-1].flags |= CCW_FLAG_CC;
2685                                 locate_record(ccw++, LO_data++,
2686                                               trkid, recoffs + 1,
2687                                               last_rec - recid + 1,
2688                                               cmd, basedev, count);
2689                         }
2690                         /* Read/write ccw. */
2691                         ccw[-1].flags |= CCW_FLAG_CC;
2692                         ccw->cmd_code = rcmd;
2693                         ccw->count = count;
2694                         if (idal_is_needed(dst, blksize)) {
2695                                 ccw->cda = (__u32)(addr_t) idaws;
2696                                 ccw->flags = CCW_FLAG_IDA;
2697                                 idaws = idal_create_words(idaws, dst, blksize);
2698                         } else {
2699                                 ccw->cda = (__u32)(addr_t) dst;
2700                                 ccw->flags = 0;
2701                         }
2702                         ccw++;
2703                         dst += blksize;
2704                         recid++;
2705                 }
2706         }
2707         if (blk_noretry_request(req) ||
2708             block->base->features & DASD_FEATURE_FAILFAST)
2709                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2710         cqr->startdev = startdev;
2711         cqr->memdev = startdev;
2712         cqr->block = block;
2713         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2714         cqr->lpm = startdev->path_data.ppm;
2715         cqr->retries = startdev->default_retries;
2716         cqr->buildclk = get_tod_clock();
2717         cqr->status = DASD_CQR_FILLED;
2718         return cqr;
2719 }
2720 
2721 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2722                                                struct dasd_device *startdev,
2723                                                struct dasd_block *block,
2724                                                struct request *req,
2725                                                sector_t first_rec,
2726                                                sector_t last_rec,
2727                                                sector_t first_trk,
2728                                                sector_t last_trk,
2729                                                unsigned int first_offs,
2730                                                unsigned int last_offs,
2731                                                unsigned int blk_per_trk,
2732                                                unsigned int blksize)
2733 {
2734         unsigned long *idaws;
2735         struct dasd_ccw_req *cqr;
2736         struct ccw1 *ccw;
2737         struct req_iterator iter;
2738         struct bio_vec bv;
2739         char *dst, *idaw_dst;
2740         unsigned int cidaw, cplength, datasize;
2741         unsigned int tlf;
2742         sector_t recid;
2743         unsigned char cmd;
2744         struct dasd_device *basedev;
2745         unsigned int trkcount, count, count_to_trk_end;
2746         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2747         unsigned char new_track, end_idaw;
2748         sector_t trkid;
2749         unsigned int recoffs;
2750 
2751         basedev = block->base;
2752         if (rq_data_dir(req) == READ)
2753                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2754         else if (rq_data_dir(req) == WRITE)
2755                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2756         else
2757                 return ERR_PTR(-EINVAL);
2758 
2759         /* Track based I/O needs IDAWs for each page, and not just for
2760          * 64 bit addresses. We need additional idals for pages
2761          * that get filled from two tracks, so we use the number
2762          * of records as upper limit.
2763          */
2764         cidaw = last_rec - first_rec + 1;
2765         trkcount = last_trk - first_trk + 1;
2766 
2767         /* 1x prefix + one read/write ccw per track */
2768         cplength = 1 + trkcount;
2769 
2770         /* on 31-bit we need space for two 32 bit addresses per page
2771          * on 64-bit one 64 bit address
2772          */
2773         datasize = sizeof(struct PFX_eckd_data) +
2774                 cidaw * sizeof(unsigned long long);
2775 
2776         /* Allocate the ccw request. */
2777         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2778                                    startdev);
2779         if (IS_ERR(cqr))
2780                 return cqr;
2781         ccw = cqr->cpaddr;
2782         /* transfer length factor: how many bytes to read from the last track */
2783         if (first_trk == last_trk)
2784                 tlf = last_offs - first_offs + 1;
2785         else
2786                 tlf = last_offs + 1;
2787         tlf *= blksize;
2788 
2789         if (prefix_LRE(ccw++, cqr->data, first_trk,
2790                        last_trk, cmd, basedev, startdev,
2791                        1 /* format */, first_offs + 1,
2792                        trkcount, blksize,
2793                        tlf) == -EAGAIN) {
2794                 /* Clock not in sync and XRC is enabled.
2795                  * Try again later.
2796                  */
2797                 dasd_sfree_request(cqr, startdev);
2798                 return ERR_PTR(-EAGAIN);
2799         }
2800 
2801         /*
2802          * The translation of request into ccw programs must meet the
2803          * following conditions:
2804          * - all idaws but the first and the last must address full pages
2805          *   (or 2K blocks on 31-bit)
2806          * - the scope of a ccw and it's idal ends with the track boundaries
2807          */
2808         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2809         recid = first_rec;
2810         new_track = 1;
2811         end_idaw = 0;
2812         len_to_track_end = 0;
2813         idaw_dst = NULL;
2814         idaw_len = 0;
2815         rq_for_each_segment(bv, req, iter) {
2816                 dst = page_address(bv.bv_page) + bv.bv_offset;
2817                 seg_len = bv.bv_len;
2818                 while (seg_len) {
2819                         if (new_track) {
2820                                 trkid = recid;
2821                                 recoffs = sector_div(trkid, blk_per_trk);
2822                                 count_to_trk_end = blk_per_trk - recoffs;
2823                                 count = min((last_rec - recid + 1),
2824                                             (sector_t)count_to_trk_end);
2825                                 len_to_track_end = count * blksize;
2826                                 ccw[-1].flags |= CCW_FLAG_CC;
2827                                 ccw->cmd_code = cmd;
2828                                 ccw->count = len_to_track_end;
2829                                 ccw->cda = (__u32)(addr_t)idaws;
2830                                 ccw->flags = CCW_FLAG_IDA;
2831                                 ccw++;
2832                                 recid += count;
2833                                 new_track = 0;
2834                                 /* first idaw for a ccw may start anywhere */
2835                                 if (!idaw_dst)
2836                                         idaw_dst = dst;
2837                         }
2838                         /* If we start a new idaw, we must make sure that it
2839                          * starts on an IDA_BLOCK_SIZE boundary.
2840                          * If we continue an idaw, we must make sure that the
2841                          * current segment begins where the so far accumulated
2842                          * idaw ends
2843                          */
2844                         if (!idaw_dst) {
2845                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2846                                         dasd_sfree_request(cqr, startdev);
2847                                         return ERR_PTR(-ERANGE);
2848                                 } else
2849                                         idaw_dst = dst;
2850                         }
2851                         if ((idaw_dst + idaw_len) != dst) {
2852                                 dasd_sfree_request(cqr, startdev);
2853                                 return ERR_PTR(-ERANGE);
2854                         }
2855                         part_len = min(seg_len, len_to_track_end);
2856                         seg_len -= part_len;
2857                         dst += part_len;
2858                         idaw_len += part_len;
2859                         len_to_track_end -= part_len;
2860                         /* collected memory area ends on an IDA_BLOCK border,
2861                          * -> create an idaw
2862                          * idal_create_words will handle cases where idaw_len
2863                          * is larger then IDA_BLOCK_SIZE
2864                          */
2865                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2866                                 end_idaw = 1;
2867                         /* We also need to end the idaw at track end */
2868                         if (!len_to_track_end) {
2869                                 new_track = 1;
2870                                 end_idaw = 1;
2871                         }
2872                         if (end_idaw) {
2873                                 idaws = idal_create_words(idaws, idaw_dst,
2874                                                           idaw_len);
2875                                 idaw_dst = NULL;
2876                                 idaw_len = 0;
2877                                 end_idaw = 0;
2878                         }
2879                 }
2880         }
2881 
2882         if (blk_noretry_request(req) ||
2883             block->base->features & DASD_FEATURE_FAILFAST)
2884                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2885         cqr->startdev = startdev;
2886         cqr->memdev = startdev;
2887         cqr->block = block;
2888         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2889         cqr->lpm = startdev->path_data.ppm;
2890         cqr->retries = startdev->default_retries;
2891         cqr->buildclk = get_tod_clock();
2892         cqr->status = DASD_CQR_FILLED;
2893         return cqr;
2894 }
2895 
2896 static int prepare_itcw(struct itcw *itcw,
2897                         unsigned int trk, unsigned int totrk, int cmd,
2898                         struct dasd_device *basedev,
2899                         struct dasd_device *startdev,
2900                         unsigned int rec_on_trk, int count,
2901                         unsigned int blksize,
2902                         unsigned int total_data_size,
2903                         unsigned int tlf,
2904                         unsigned int blk_per_trk)
2905 {
2906         struct PFX_eckd_data pfxdata;
2907         struct dasd_eckd_private *basepriv, *startpriv;
2908         struct DE_eckd_data *dedata;
2909         struct LRE_eckd_data *lredata;
2910         struct dcw *dcw;
2911 
2912         u32 begcyl, endcyl;
2913         u16 heads, beghead, endhead;
2914         u8 pfx_cmd;
2915 
2916         int rc = 0;
2917         int sector = 0;
2918         int dn, d;
2919 
2920 
2921         /* setup prefix data */
2922         basepriv = (struct dasd_eckd_private *) basedev->private;
2923         startpriv = (struct dasd_eckd_private *) startdev->private;
2924         dedata = &pfxdata.define_extent;
2925         lredata = &pfxdata.locate_record;
2926 
2927         memset(&pfxdata, 0, sizeof(pfxdata));
2928         pfxdata.format = 1; /* PFX with LRE */
2929         pfxdata.base_address = basepriv->ned->unit_addr;
2930         pfxdata.base_lss = basepriv->ned->ID;
2931         pfxdata.validity.define_extent = 1;
2932 
2933         /* private uid is kept up to date, conf_data may be outdated */
2934         if (startpriv->uid.type != UA_BASE_DEVICE) {
2935                 pfxdata.validity.verify_base = 1;
2936                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2937                         pfxdata.validity.hyper_pav = 1;
2938         }
2939 
2940         switch (cmd) {
2941         case DASD_ECKD_CCW_READ_TRACK_DATA:
2942                 dedata->mask.perm = 0x1;
2943                 dedata->attributes.operation = basepriv->attrib.operation;
2944                 dedata->blk_size = blksize;
2945                 dedata->ga_extended |= 0x42;
2946                 lredata->operation.orientation = 0x0;
2947                 lredata->operation.operation = 0x0C;
2948                 lredata->auxiliary.check_bytes = 0x01;
2949                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2950                 break;
2951         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2952                 dedata->mask.perm = 0x02;
2953                 dedata->attributes.operation = basepriv->attrib.operation;
2954                 dedata->blk_size = blksize;
2955                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2956                 dedata->ga_extended |= 0x42;
2957                 lredata->operation.orientation = 0x0;
2958                 lredata->operation.operation = 0x3F;
2959                 lredata->extended_operation = 0x23;
2960                 lredata->auxiliary.check_bytes = 0x2;
2961                 pfx_cmd = DASD_ECKD_CCW_PFX;
2962                 break;
2963         default:
2964                 DBF_DEV_EVENT(DBF_ERR, basedev,
2965                               "prepare itcw, unknown opcode 0x%x", cmd);
2966                 BUG();
2967                 break;
2968         }
2969         if (rc)
2970                 return rc;
2971 
2972         dedata->attributes.mode = 0x3;  /* ECKD */
2973 
2974         heads = basepriv->rdc_data.trk_per_cyl;
2975         begcyl = trk / heads;
2976         beghead = trk % heads;
2977         endcyl = totrk / heads;
2978         endhead = totrk % heads;
2979 
2980         /* check for sequential prestage - enhance cylinder range */
2981         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2982             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2983 
2984                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2985                         endcyl += basepriv->attrib.nr_cyl;
2986                 else
2987                         endcyl = (basepriv->real_cyl - 1);
2988         }
2989 
2990         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2991         set_ch_t(&dedata->end_ext, endcyl, endhead);
2992 
2993         dedata->ep_format = 0x20; /* records per track is valid */
2994         dedata->ep_rec_per_track = blk_per_trk;
2995 
2996         if (rec_on_trk) {
2997                 switch (basepriv->rdc_data.dev_type) {
2998                 case 0x3390:
2999                         dn = ceil_quot(blksize + 6, 232);
3000                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3001                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3002                         break;
3003                 case 0x3380:
3004                         d = 7 + ceil_quot(blksize + 12, 32);
3005                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3006                         break;
3007                 }
3008         }
3009 
3010         lredata->auxiliary.length_valid = 1;
3011         lredata->auxiliary.length_scope = 1;
3012         lredata->auxiliary.imbedded_ccw_valid = 1;
3013         lredata->length = tlf;
3014         lredata->imbedded_ccw = cmd;
3015         lredata->count = count;
3016         lredata->sector = sector;
3017         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3018         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3019         lredata->search_arg.head = lredata->seek_addr.head;
3020         lredata->search_arg.record = rec_on_trk;
3021 
3022         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3023                      &pfxdata, sizeof(pfxdata), total_data_size);
3024         return PTR_RET(dcw);
3025 }
3026 
3027 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3028                                                struct dasd_device *startdev,
3029                                                struct dasd_block *block,
3030                                                struct request *req,
3031                                                sector_t first_rec,
3032                                                sector_t last_rec,
3033                                                sector_t first_trk,
3034                                                sector_t last_trk,
3035                                                unsigned int first_offs,
3036                                                unsigned int last_offs,
3037                                                unsigned int blk_per_trk,
3038                                                unsigned int blksize)
3039 {
3040         struct dasd_ccw_req *cqr;
3041         struct req_iterator iter;
3042         struct bio_vec bv;
3043         char *dst;
3044         unsigned int trkcount, ctidaw;
3045         unsigned char cmd;
3046         struct dasd_device *basedev;
3047         unsigned int tlf;
3048         struct itcw *itcw;
3049         struct tidaw *last_tidaw = NULL;
3050         int itcw_op;
3051         size_t itcw_size;
3052         u8 tidaw_flags;
3053         unsigned int seg_len, part_len, len_to_track_end;
3054         unsigned char new_track;
3055         sector_t recid, trkid;
3056         unsigned int offs;
3057         unsigned int count, count_to_trk_end;
3058         int ret;
3059 
3060         basedev = block->base;
3061         if (rq_data_dir(req) == READ) {
3062                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3063                 itcw_op = ITCW_OP_READ;
3064         } else if (rq_data_dir(req) == WRITE) {
3065                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3066                 itcw_op = ITCW_OP_WRITE;
3067         } else
3068                 return ERR_PTR(-EINVAL);
3069 
3070         /* trackbased I/O needs address all memory via TIDAWs,
3071          * not just for 64 bit addresses. This allows us to map
3072          * each segment directly to one tidaw.
3073          * In the case of write requests, additional tidaws may
3074          * be needed when a segment crosses a track boundary.
3075          */
3076         trkcount = last_trk - first_trk + 1;
3077         ctidaw = 0;
3078         rq_for_each_segment(bv, req, iter) {
3079                 ++ctidaw;
3080         }
3081         if (rq_data_dir(req) == WRITE)
3082                 ctidaw += (last_trk - first_trk);
3083 
3084         /* Allocate the ccw request. */
3085         itcw_size = itcw_calc_size(0, ctidaw, 0);
3086         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3087         if (IS_ERR(cqr))
3088                 return cqr;
3089 
3090         /* transfer length factor: how many bytes to read from the last track */
3091         if (first_trk == last_trk)
3092                 tlf = last_offs - first_offs + 1;
3093         else
3094                 tlf = last_offs + 1;
3095         tlf *= blksize;
3096 
3097         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3098         if (IS_ERR(itcw)) {
3099                 ret = -EINVAL;
3100                 goto out_error;
3101         }
3102         cqr->cpaddr = itcw_get_tcw(itcw);
3103         if (prepare_itcw(itcw, first_trk, last_trk,
3104                          cmd, basedev, startdev,
3105                          first_offs + 1,
3106                          trkcount, blksize,
3107                          (last_rec - first_rec + 1) * blksize,
3108                          tlf, blk_per_trk) == -EAGAIN) {
3109                 /* Clock not in sync and XRC is enabled.
3110                  * Try again later.
3111                  */
3112                 ret = -EAGAIN;
3113                 goto out_error;
3114         }
3115         len_to_track_end = 0;
3116         /*
3117          * A tidaw can address 4k of memory, but must not cross page boundaries
3118          * We can let the block layer handle this by setting
3119          * blk_queue_segment_boundary to page boundaries and
3120          * blk_max_segment_size to page size when setting up the request queue.
3121          * For write requests, a TIDAW must not cross track boundaries, because
3122          * we have to set the CBC flag on the last tidaw for each track.
3123          */
3124         if (rq_data_dir(req) == WRITE) {
3125                 new_track = 1;
3126                 recid = first_rec;
3127                 rq_for_each_segment(bv, req, iter) {
3128                         dst = page_address(bv.bv_page) + bv.bv_offset;
3129                         seg_len = bv.bv_len;
3130                         while (seg_len) {
3131                                 if (new_track) {
3132                                         trkid = recid;
3133                                         offs = sector_div(trkid, blk_per_trk);
3134                                         count_to_trk_end = blk_per_trk - offs;
3135                                         count = min((last_rec - recid + 1),
3136                                                     (sector_t)count_to_trk_end);
3137                                         len_to_track_end = count * blksize;
3138                                         recid += count;
3139                                         new_track = 0;
3140                                 }
3141                                 part_len = min(seg_len, len_to_track_end);
3142                                 seg_len -= part_len;
3143                                 len_to_track_end -= part_len;
3144                                 /* We need to end the tidaw at track end */
3145                                 if (!len_to_track_end) {
3146                                         new_track = 1;
3147                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3148                                 } else
3149                                         tidaw_flags = 0;
3150                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3151                                                             dst, part_len);
3152                                 if (IS_ERR(last_tidaw)) {
3153                                         ret = -EINVAL;
3154                                         goto out_error;
3155                                 }
3156                                 dst += part_len;
3157                         }
3158                 }
3159         } else {
3160                 rq_for_each_segment(bv, req, iter) {
3161                         dst = page_address(bv.bv_page) + bv.bv_offset;
3162                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3163                                                     dst, bv.bv_len);
3164                         if (IS_ERR(last_tidaw)) {
3165                                 ret = -EINVAL;
3166                                 goto out_error;
3167                         }
3168                 }
3169         }
3170         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3171         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3172         itcw_finalize(itcw);
3173 
3174         if (blk_noretry_request(req) ||
3175             block->base->features & DASD_FEATURE_FAILFAST)
3176                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3177         cqr->cpmode = 1;
3178         cqr->startdev = startdev;
3179         cqr->memdev = startdev;
3180         cqr->block = block;
3181         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3182         cqr->lpm = startdev->path_data.ppm;
3183         cqr->retries = startdev->default_retries;
3184         cqr->buildclk = get_tod_clock();
3185         cqr->status = DASD_CQR_FILLED;
3186         return cqr;
3187 out_error:
3188         dasd_sfree_request(cqr, startdev);
3189         return ERR_PTR(ret);
3190 }
3191 
3192 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3193                                                struct dasd_block *block,
3194                                                struct request *req)
3195 {
3196         int cmdrtd, cmdwtd;
3197         int use_prefix;
3198         int fcx_multitrack;
3199         struct dasd_eckd_private *private;
3200         struct dasd_device *basedev;
3201         sector_t first_rec, last_rec;
3202         sector_t first_trk, last_trk;
3203         unsigned int first_offs, last_offs;
3204         unsigned int blk_per_trk, blksize;
3205         int cdlspecial;
3206         unsigned int data_size;
3207         struct dasd_ccw_req *cqr;
3208 
3209         basedev = block->base;
3210         private = (struct dasd_eckd_private *) basedev->private;
3211 
3212         /* Calculate number of blocks/records per track. */
3213         blksize = block->bp_block;
3214         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3215         if (blk_per_trk == 0)
3216                 return ERR_PTR(-EINVAL);
3217         /* Calculate record id of first and last block. */
3218         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3219         first_offs = sector_div(first_trk, blk_per_trk);
3220         last_rec = last_trk =
3221                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3222         last_offs = sector_div(last_trk, blk_per_trk);
3223         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3224 
3225         fcx_multitrack = private->features.feature[40] & 0x20;
3226         data_size = blk_rq_bytes(req);
3227         if (data_size % blksize)
3228                 return ERR_PTR(-EINVAL);
3229         /* tpm write request add CBC data on each track boundary */
3230         if (rq_data_dir(req) == WRITE)
3231                 data_size += (last_trk - first_trk) * 4;
3232 
3233         /* is read track data and write track data in command mode supported? */
3234         cmdrtd = private->features.feature[9] & 0x20;
3235         cmdwtd = private->features.feature[12] & 0x40;
3236         use_prefix = private->features.feature[8] & 0x01;
3237 
3238         cqr = NULL;
3239         if (cdlspecial || dasd_page_cache) {
3240                 /* do nothing, just fall through to the cmd mode single case */
3241         } else if ((data_size <= private->fcx_max_data)
3242                    && (fcx_multitrack || (first_trk == last_trk))) {
3243                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3244                                                     first_rec, last_rec,
3245                                                     first_trk, last_trk,
3246                                                     first_offs, last_offs,
3247                                                     blk_per_trk, blksize);
3248                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3249                     (PTR_ERR(cqr) != -ENOMEM))
3250                         cqr = NULL;
3251         } else if (use_prefix &&
3252                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3253                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3254                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3255                                                    first_rec, last_rec,
3256                                                    first_trk, last_trk,
3257                                                    first_offs, last_offs,
3258                                                    blk_per_trk, blksize);
3259                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3260                     (PTR_ERR(cqr) != -ENOMEM))
3261                         cqr = NULL;
3262         }
3263         if (!cqr)
3264                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3265                                                     first_rec, last_rec,
3266                                                     first_trk, last_trk,
3267                                                     first_offs, last_offs,
3268                                                     blk_per_trk, blksize);
3269         return cqr;
3270 }
3271 
3272 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3273                                                struct dasd_block *block,
3274                                                struct request *req)
3275 {
3276         unsigned long *idaws;
3277         struct dasd_device *basedev;
3278         struct dasd_ccw_req *cqr;
3279         struct ccw1 *ccw;
3280         struct req_iterator iter;
3281         struct bio_vec bv;
3282         char *dst;
3283         unsigned char cmd;
3284         unsigned int trkcount;
3285         unsigned int seg_len, len_to_track_end;
3286         unsigned int first_offs;
3287         unsigned int cidaw, cplength, datasize;
3288         sector_t first_trk, last_trk, sectors;
3289         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3290         unsigned int pfx_datasize;
3291 
3292         /*
3293          * raw track access needs to be mutiple of 64k and on 64k boundary
3294          * For read requests we can fix an incorrect alignment by padding
3295          * the request with dummy pages.
3296          */
3297         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3298         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3299                 DASD_RAW_SECTORS_PER_TRACK;
3300         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3301                 DASD_RAW_SECTORS_PER_TRACK;
3302         basedev = block->base;
3303         if ((start_padding_sectors || end_padding_sectors) &&
3304             (rq_data_dir(req) == WRITE)) {
3305                 DBF_DEV_EVENT(DBF_ERR, basedev,
3306                               "raw write not track aligned (%lu,%lu) req %p",
3307                               start_padding_sectors, end_padding_sectors, req);
3308                 cqr = ERR_PTR(-EINVAL);
3309                 goto out;
3310         }
3311 
3312         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3313         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3314                 DASD_RAW_SECTORS_PER_TRACK;
3315         trkcount = last_trk - first_trk + 1;
3316         first_offs = 0;
3317 
3318         if (rq_data_dir(req) == READ)
3319                 cmd = DASD_ECKD_CCW_READ_TRACK;
3320         else if (rq_data_dir(req) == WRITE)
3321                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3322         else {
3323                 cqr = ERR_PTR(-EINVAL);
3324                 goto out;
3325         }
3326 
3327         /*
3328          * Raw track based I/O needs IDAWs for each page,
3329          * and not just for 64 bit addresses.
3330          */
3331         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3332 
3333         /* 1x prefix + one read/write ccw per track */
3334         cplength = 1 + trkcount;
3335 
3336         /*
3337          * struct PFX_eckd_data has up to 2 byte as extended parameter
3338          * this is needed for write full track and has to be mentioned
3339          * separately
3340          * add 8 instead of 2 to keep 8 byte boundary
3341          */
3342         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3343 
3344         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3345 
3346         /* Allocate the ccw request. */
3347         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3348                                    datasize, startdev);
3349         if (IS_ERR(cqr))
3350                 goto out;
3351         ccw = cqr->cpaddr;
3352 
3353         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3354                        basedev, startdev, 1 /* format */, first_offs + 1,
3355                        trkcount, 0, 0) == -EAGAIN) {
3356                 /* Clock not in sync and XRC is enabled.
3357                  * Try again later.
3358                  */
3359                 dasd_sfree_request(cqr, startdev);
3360                 cqr = ERR_PTR(-EAGAIN);
3361                 goto out;
3362         }
3363 
3364         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3365         len_to_track_end = 0;
3366         if (start_padding_sectors) {
3367                 ccw[-1].flags |= CCW_FLAG_CC;
3368                 ccw->cmd_code = cmd;
3369                 /* maximum 3390 track size */
3370                 ccw->count = 57326;
3371                 /* 64k map to one track */
3372                 len_to_track_end = 65536 - start_padding_sectors * 512;
3373                 ccw->cda = (__u32)(addr_t)idaws;
3374                 ccw->flags |= CCW_FLAG_IDA;
3375                 ccw->flags |= CCW_FLAG_SLI;
3376                 ccw++;
3377                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3378                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3379         }
3380         rq_for_each_segment(bv, req, iter) {
3381                 dst = page_address(bv.bv_page) + bv.bv_offset;
3382                 seg_len = bv.bv_len;
3383                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3384                         memset(dst, 0, seg_len);
3385                 if (!len_to_track_end) {
3386                         ccw[-1].flags |= CCW_FLAG_CC;
3387                         ccw->cmd_code = cmd;
3388                         /* maximum 3390 track size */
3389                         ccw->count = 57326;
3390                         /* 64k map to one track */
3391                         len_to_track_end = 65536;
3392                         ccw->cda = (__u32)(addr_t)idaws;
3393                         ccw->flags |= CCW_FLAG_IDA;
3394                         ccw->flags |= CCW_FLAG_SLI;
3395                         ccw++;
3396                 }
3397                 len_to_track_end -= seg_len;
3398                 idaws = idal_create_words(idaws, dst, seg_len);
3399         }
3400         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3401                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3402         if (blk_noretry_request(req) ||
3403             block->base->features & DASD_FEATURE_FAILFAST)
3404                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3405         cqr->startdev = startdev;
3406         cqr->memdev = startdev;
3407         cqr->block = block;
3408         cqr->expires = startdev->default_expires * HZ;
3409         cqr->lpm = startdev->path_data.ppm;
3410         cqr->retries = startdev->default_retries;
3411         cqr->buildclk = get_tod_clock();
3412         cqr->status = DASD_CQR_FILLED;
3413 
3414         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3415                 cqr = NULL;
3416 out:
3417         return cqr;
3418 }
3419 
3420 
3421 static int
3422 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3423 {
3424         struct dasd_eckd_private *private;
3425         struct ccw1 *ccw;
3426         struct req_iterator iter;
3427         struct bio_vec bv;
3428         char *dst, *cda;
3429         unsigned int blksize, blk_per_trk, off;
3430         sector_t recid;
3431         int status;
3432 
3433         if (!dasd_page_cache)
3434                 goto out;
3435         private = (struct dasd_eckd_private *) cqr->block->base->private;
3436         blksize = cqr->block->bp_block;
3437         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3438         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3439         ccw = cqr->cpaddr;
3440         /* Skip over define extent & locate record. */
3441         ccw++;
3442         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3443                 ccw++;
3444         rq_for_each_segment(bv, req, iter) {
3445                 dst = page_address(bv.bv_page) + bv.bv_offset;
3446                 for (off = 0; off < bv.bv_len; off += blksize) {
3447                         /* Skip locate record. */
3448                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3449                                 ccw++;
3450                         if (dst) {
3451                                 if (ccw->flags & CCW_FLAG_IDA)
3452                                         cda = *((char **)((addr_t) ccw->cda));
3453                                 else
3454                                         cda = (char *)((addr_t) ccw->cda);
3455                                 if (dst != cda) {
3456                                         if (rq_data_dir(req) == READ)
3457                                                 memcpy(dst, cda, bv.bv_len);
3458                                         kmem_cache_free(dasd_page_cache,
3459                                             (void *)((addr_t)cda & PAGE_MASK));
3460                                 }
3461                                 dst = NULL;
3462                         }
3463                         ccw++;
3464                         recid++;
3465                 }
3466         }
3467 out:
3468         status = cqr->status == DASD_CQR_DONE;
3469         dasd_sfree_request(cqr, cqr->memdev);
3470         return status;
3471 }
3472 
3473 /*
3474  * Modify ccw/tcw in cqr so it can be started on a base device.
3475  *
3476  * Note that this is not enough to restart the cqr!
3477  * Either reset cqr->startdev as well (summary unit check handling)
3478  * or restart via separate cqr (as in ERP handling).
3479  */
3480 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3481 {
3482         struct ccw1 *ccw;
3483         struct PFX_eckd_data *pfxdata;
3484         struct tcw *tcw;
3485         struct tccb *tccb;
3486         struct dcw *dcw;
3487 
3488         if (cqr->cpmode == 1) {
3489                 tcw = cqr->cpaddr;
3490                 tccb = tcw_get_tccb(tcw);
3491                 dcw = (struct dcw *)&tccb->tca[0];
3492                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3493                 pfxdata->validity.verify_base = 0;
3494                 pfxdata->validity.hyper_pav = 0;
3495         } else {
3496                 ccw = cqr->cpaddr;
3497                 pfxdata = cqr->data;
3498                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3499                         pfxdata->validity.verify_base = 0;
3500                         pfxdata->validity.hyper_pav = 0;
3501                 }
3502         }
3503 }
3504 
3505 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3506 
3507 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3508                                                      struct dasd_block *block,
3509                                                      struct request *req)
3510 {
3511         struct dasd_eckd_private *private;
3512         struct dasd_device *startdev;
3513         unsigned long flags;
3514         struct dasd_ccw_req *cqr;
3515 
3516         startdev = dasd_alias_get_start_dev(base);
3517         if (!startdev)
3518                 startdev = base;
3519         private = (struct dasd_eckd_private *) startdev->private;
3520         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3521                 return ERR_PTR(-EBUSY);
3522 
3523         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3524         private->count++;
3525         if ((base->features & DASD_FEATURE_USERAW))
3526                 cqr = dasd_raw_build_cp(startdev, block, req);
3527         else
3528                 cqr = dasd_eckd_build_cp(startdev, block, req);
3529         if (IS_ERR(cqr))
3530                 private->count--;
3531         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3532         return cqr;
3533 }
3534 
3535 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3536                                    struct request *req)
3537 {
3538         struct dasd_eckd_private *private;
3539         unsigned long flags;
3540 
3541         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3542         private = (struct dasd_eckd_private *) cqr->memdev->private;
3543         private->count--;
3544         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3545         return dasd_eckd_free_cp(cqr, req);
3546 }
3547 
3548 static int
3549 dasd_eckd_fill_info(struct dasd_device * device,
3550                     struct dasd_information2_t * info)
3551 {
3552         struct dasd_eckd_private *private;
3553 
3554         private = (struct dasd_eckd_private *) device->private;
3555         info->label_block = 2;
3556         info->FBA_layout = private->uses_cdl ? 0 : 1;
3557         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3558         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3559         memcpy(info->characteristics, &private->rdc_data,
3560                sizeof(struct dasd_eckd_characteristics));
3561         info->confdata_size = min((unsigned long)private->conf_len,
3562                                   sizeof(info->configuration_data));
3563         memcpy(info->configuration_data, private->conf_data,
3564                info->confdata_size);
3565         return 0;
3566 }
3567 
3568 /*
3569  * SECTION: ioctl functions for eckd devices.
3570  */
3571 
3572 /*
3573  * Release device ioctl.
3574  * Buils a channel programm to releases a prior reserved
3575  * (see dasd_eckd_reserve) device.
3576  */
3577 static int
3578 dasd_eckd_release(struct dasd_device *device)
3579 {
3580         struct dasd_ccw_req *cqr;
3581         int rc;
3582         struct ccw1 *ccw;
3583         int useglobal;
3584 
3585         if (!capable(CAP_SYS_ADMIN))
3586                 return -EACCES;
3587 
3588         useglobal = 0;
3589         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3590         if (IS_ERR(cqr)) {
3591                 mutex_lock(&dasd_reserve_mutex);
3592                 useglobal = 1;
3593                 cqr = &dasd_reserve_req->cqr;
3594                 memset(cqr, 0, sizeof(*cqr));
3595                 memset(&dasd_reserve_req->ccw, 0,
3596                        sizeof(dasd_reserve_req->ccw));
3597                 cqr->cpaddr = &dasd_reserve_req->ccw;
3598                 cqr->data = &dasd_reserve_req->data;
3599                 cqr->magic = DASD_ECKD_MAGIC;
3600         }
3601         ccw = cqr->cpaddr;
3602         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3603         ccw->flags |= CCW_FLAG_SLI;
3604         ccw->count = 32;
3605         ccw->cda = (__u32)(addr_t) cqr->data;
3606         cqr->startdev = device;
3607         cqr->memdev = device;
3608         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3609         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3610         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3611         cqr->expires = 2 * HZ;
3612         cqr->buildclk = get_tod_clock();
3613         cqr->status = DASD_CQR_FILLED;
3614 
3615         rc = dasd_sleep_on_immediatly(cqr);
3616         if (!rc)
3617                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3618 
3619         if (useglobal)
3620                 mutex_unlock(&dasd_reserve_mutex);
3621         else
3622                 dasd_sfree_request(cqr, cqr->memdev);
3623         return rc;
3624 }
3625 
3626 /*
3627  * Reserve device ioctl.
3628  * Options are set to 'synchronous wait for interrupt' and
3629  * 'timeout the request'. This leads to a terminate IO if
3630  * the interrupt is outstanding for a certain time.
3631  */
3632 static int
3633 dasd_eckd_reserve(struct dasd_device *device)
3634 {
3635         struct dasd_ccw_req *cqr;
3636         int rc;
3637         struct ccw1 *ccw;
3638         int useglobal;
3639 
3640         if (!capable(CAP_SYS_ADMIN))
3641                 return -EACCES;
3642 
3643         useglobal = 0;
3644         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3645         if (IS_ERR(cqr)) {
3646                 mutex_lock(&dasd_reserve_mutex);
3647                 useglobal = 1;
3648                 cqr = &dasd_reserve_req->cqr;
3649                 memset(cqr, 0, sizeof(*cqr));
3650                 memset(&dasd_reserve_req->ccw, 0,
3651                        sizeof(dasd_reserve_req->ccw));
3652                 cqr->cpaddr = &dasd_reserve_req->ccw;
3653                 cqr->data = &dasd_reserve_req->data;
3654                 cqr->magic = DASD_ECKD_MAGIC;
3655         }
3656         ccw = cqr->cpaddr;
3657         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3658         ccw->flags |= CCW_FLAG_SLI;
3659         ccw->count = 32;
3660         ccw->cda = (__u32)(addr_t) cqr->data;
3661         cqr->startdev = device;
3662         cqr->memdev = device;
3663         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3664         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3665         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3666         cqr->expires = 2 * HZ;
3667         cqr->buildclk = get_tod_clock();
3668         cqr->status = DASD_CQR_FILLED;
3669 
3670         rc = dasd_sleep_on_immediatly(cqr);
3671         if (!rc)
3672                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3673 
3674         if (useglobal)
3675                 mutex_unlock(&dasd_reserve_mutex);
3676         else
3677                 dasd_sfree_request(cqr, cqr->memdev);
3678         return rc;
3679 }
3680 
3681 /*
3682  * Steal lock ioctl - unconditional reserve device.
3683  * Buils a channel programm to break a device's reservation.
3684  * (unconditional reserve)
3685  */
3686 static int
3687 dasd_eckd_steal_lock(struct dasd_device *device)
3688 {
3689         struct dasd_ccw_req *cqr;
3690         int rc;
3691         struct ccw1 *ccw;
3692         int useglobal;
3693 
3694         if (!capable(CAP_SYS_ADMIN))
3695                 return -EACCES;
3696 
3697         useglobal = 0;
3698         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3699         if (IS_ERR(cqr)) {
3700                 mutex_lock(&dasd_reserve_mutex);
3701                 useglobal = 1;
3702                 cqr = &dasd_reserve_req->cqr;
3703                 memset(cqr, 0, sizeof(*cqr));
3704                 memset(&dasd_reserve_req->ccw, 0,
3705                        sizeof(dasd_reserve_req->ccw));
3706                 cqr->cpaddr = &dasd_reserve_req->ccw;
3707                 cqr->data = &dasd_reserve_req->data;
3708                 cqr->magic = DASD_ECKD_MAGIC;
3709         }
3710         ccw = cqr->cpaddr;
3711         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3712         ccw->flags |= CCW_FLAG_SLI;
3713         ccw->count = 32;
3714         ccw->cda = (__u32)(addr_t) cqr->data;
3715         cqr->startdev = device;
3716         cqr->memdev = device;
3717         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3718         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3719         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3720         cqr->expires = 2 * HZ;
3721         cqr->buildclk = get_tod_clock();
3722         cqr->status = DASD_CQR_FILLED;
3723 
3724         rc = dasd_sleep_on_immediatly(cqr);
3725         if (!rc)
3726                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3727 
3728         if (useglobal)
3729                 mutex_unlock(&dasd_reserve_mutex);
3730         else
3731                 dasd_sfree_request(cqr, cqr->memdev);
3732         return rc;
3733 }
3734 
3735 /*
3736  * SNID - Sense Path Group ID
3737  * This ioctl may be used in situations where I/O is stalled due to
3738  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3739  * preallocated dasd_reserve_req.
3740  */
3741 static int dasd_eckd_snid(struct dasd_device *device,
3742                           void __user *argp)
3743 {
3744         struct dasd_ccw_req *cqr;
3745         int rc;
3746         struct ccw1 *ccw;
3747         int useglobal;
3748         struct dasd_snid_ioctl_data usrparm;
3749 
3750         if (!capable(CAP_SYS_ADMIN))
3751                 return -EACCES;
3752 
3753         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3754                 return -EFAULT;
3755 
3756         useglobal = 0;
3757         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3758                                    sizeof(struct dasd_snid_data), device);
3759         if (IS_ERR(cqr)) {
3760                 mutex_lock(&dasd_reserve_mutex);
3761                 useglobal = 1;
3762                 cqr = &dasd_reserve_req->cqr;
3763                 memset(cqr, 0, sizeof(*cqr));
3764                 memset(&dasd_reserve_req->ccw, 0,
3765                        sizeof(dasd_reserve_req->ccw));
3766                 cqr->cpaddr = &dasd_reserve_req->ccw;
3767                 cqr->data = &dasd_reserve_req->data;
3768                 cqr->magic = DASD_ECKD_MAGIC;
3769         }
3770         ccw = cqr->cpaddr;
3771         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3772         ccw->flags |= CCW_FLAG_SLI;
3773         ccw->count = 12;
3774         ccw->cda = (__u32)(addr_t) cqr->data;
3775         cqr->startdev = device;
3776         cqr->memdev = device;
3777         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3778         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3779         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3780         cqr->retries = 5;
3781         cqr->expires = 10 * HZ;
3782         cqr->buildclk = get_tod_clock();
3783         cqr->status = DASD_CQR_FILLED;
3784         cqr->lpm = usrparm.path_mask;
3785 
3786         rc = dasd_sleep_on_immediatly(cqr);
3787         /* verify that I/O processing didn't modify the path mask */
3788         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3789                 rc = -EIO;
3790         if (!rc) {
3791                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3792                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3793                         rc = -EFAULT;
3794         }
3795 
3796         if (useglobal)
3797                 mutex_unlock(&dasd_reserve_mutex);
3798         else
3799                 dasd_sfree_request(cqr, cqr->memdev);
3800         return rc;
3801 }
3802 
3803 /*
3804  * Read performance statistics
3805  */
3806 static int
3807 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3808 {
3809         struct dasd_psf_prssd_data *prssdp;
3810         struct dasd_rssd_perf_stats_t *stats;
3811         struct dasd_ccw_req *cqr;
3812         struct ccw1 *ccw;
3813         int rc;
3814 
3815         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3816                                    (sizeof(struct dasd_psf_prssd_data) +
3817                                     sizeof(struct dasd_rssd_perf_stats_t)),
3818                                    device);
3819         if (IS_ERR(cqr)) {
3820                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3821                             "Could not allocate initialization request");
3822                 return PTR_ERR(cqr);
3823         }
3824         cqr->startdev = device;
3825         cqr->memdev = device;
3826         cqr->retries = 0;
3827         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3828         cqr->expires = 10 * HZ;
3829 
3830         /* Prepare for Read Subsystem Data */
3831         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3832         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3833         prssdp->order = PSF_ORDER_PRSSD;
3834         prssdp->suborder = 0x01;        /* Performance Statistics */
3835         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3836 
3837         ccw = cqr->cpaddr;
3838         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3839         ccw->count = sizeof(struct dasd_psf_prssd_data);
3840         ccw->flags |= CCW_FLAG_CC;
3841         ccw->cda = (__u32)(addr_t) prssdp;
3842 
3843         /* Read Subsystem Data - Performance Statistics */
3844         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3845         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3846 
3847         ccw++;
3848         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3849         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3850         ccw->cda = (__u32)(addr_t) stats;
3851 
3852         cqr->buildclk = get_tod_clock();
3853         cqr->status = DASD_CQR_FILLED;
3854         rc = dasd_sleep_on(cqr);
3855         if (rc == 0) {
3856                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3857                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3858                 if (copy_to_user(argp, stats,
3859                                  sizeof(struct dasd_rssd_perf_stats_t)))
3860                         rc = -EFAULT;
3861         }
3862         dasd_sfree_request(cqr, cqr->memdev);
3863         return rc;
3864 }
3865 
3866 /*
3867  * Get attributes (cache operations)
3868  * Returnes the cache attributes used in Define Extend (DE).
3869  */
3870 static int
3871 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3872 {
3873         struct dasd_eckd_private *private =
3874                 (struct dasd_eckd_private *)device->private;
3875         struct attrib_data_t attrib = private->attrib;
3876         int rc;
3877 
3878         if (!capable(CAP_SYS_ADMIN))
3879                 return -EACCES;
3880         if (!argp)
3881                 return -EINVAL;
3882 
3883         rc = 0;
3884         if (copy_to_user(argp, (long *) &attrib,
3885                          sizeof(struct attrib_data_t)))
3886                 rc = -EFAULT;
3887 
3888         return rc;
3889 }
3890 
3891 /*
3892  * Set attributes (cache operations)
3893  * Stores the attributes for cache operation to be used in Define Extend (DE).
3894  */
3895 static int
3896 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3897 {
3898         struct dasd_eckd_private *private =
3899                 (struct dasd_eckd_private *)device->private;
3900         struct attrib_data_t attrib;
3901 
3902         if (!capable(CAP_SYS_ADMIN))
3903                 return -EACCES;
3904         if (!argp)
3905                 return -EINVAL;
3906 
3907         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3908                 return -EFAULT;
3909         private->attrib = attrib;
3910 
3911         dev_info(&device->cdev->dev,
3912                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3913                  private->attrib.operation, private->attrib.nr_cyl);
3914         return 0;
3915 }
3916 
3917 /*
3918  * Issue syscall I/O to EMC Symmetrix array.
3919  * CCWs are PSF and RSSD
3920  */
3921 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3922 {
3923         struct dasd_symmio_parms usrparm;
3924         char *psf_data, *rssd_result;
3925         struct dasd_ccw_req *cqr;
3926         struct ccw1 *ccw;
3927         char psf0, psf1;
3928         int rc;
3929 
3930         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3931                 return -EACCES;
3932         psf0 = psf1 = 0;
3933 
3934         /* Copy parms from caller */
3935         rc = -EFAULT;
3936         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3937                 goto out;
3938         if (is_compat_task() || sizeof(long) == 4) {
3939                 /* Make sure pointers are sane even on 31 bit. */
3940                 rc = -EINVAL;
3941                 if ((usrparm.psf_data >> 32) != 0)
3942                         goto out;
3943                 if ((usrparm.rssd_result >> 32) != 0)
3944                         goto out;
3945                 usrparm.psf_data &= 0x7fffffffULL;
3946                 usrparm.rssd_result &= 0x7fffffffULL;
3947         }
3948         /* alloc I/O data area */
3949         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3950         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3951         if (!psf_data || !rssd_result) {
3952                 rc = -ENOMEM;
3953                 goto out_free;
3954         }
3955 
3956         /* get syscall header from user space */
3957         rc = -EFAULT;
3958         if (copy_from_user(psf_data,
3959                            (void __user *)(unsigned long) usrparm.psf_data,
3960                            usrparm.psf_data_len))
3961                 goto out_free;
3962         psf0 = psf_data[0];
3963         psf1 = psf_data[1];
3964 
3965         /* setup CCWs for PSF + RSSD */
3966         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3967         if (IS_ERR(cqr)) {
3968                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3969                         "Could not allocate initialization request");
3970                 rc = PTR_ERR(cqr);
3971                 goto out_free;
3972         }
3973 
3974         cqr->startdev = device;
3975         cqr->memdev = device;
3976         cqr->retries = 3;
3977         cqr->expires = 10 * HZ;
3978         cqr->buildclk = get_tod_clock();
3979         cqr->status = DASD_CQR_FILLED;
3980 
3981         /* Build the ccws */
3982         ccw = cqr->cpaddr;
3983 
3984         /* PSF ccw */
3985         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3986         ccw->count = usrparm.psf_data_len;
3987         ccw->flags |= CCW_FLAG_CC;
3988         ccw->cda = (__u32)(addr_t) psf_data;
3989 
3990         ccw++;
3991 
3992         /* RSSD ccw  */
3993         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3994         ccw->count = usrparm.rssd_result_len;
3995         ccw->flags = CCW_FLAG_SLI ;
3996         ccw->cda = (__u32)(addr_t) rssd_result;
3997 
3998         rc = dasd_sleep_on(cqr);
3999         if (rc)
4000                 goto out_sfree;
4001 
4002         rc = -EFAULT;
4003         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4004                            rssd_result, usrparm.rssd_result_len))
4005                 goto out_sfree;
4006         rc = 0;
4007 
4008 out_sfree:
4009         dasd_sfree_request(cqr, cqr->memdev);
4010 out_free:
4011         kfree(rssd_result);
4012         kfree(psf_data);
4013 out:
4014         DBF_DEV_EVENT(DBF_WARNING, device,
4015                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4016                       (int) psf0, (int) psf1, rc);
4017         return rc;
4018 }
4019 
4020 static int
4021 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4022 {
4023         struct dasd_device *device = block->base;
4024 
4025         switch (cmd) {
4026         case BIODASDGATTR:
4027                 return dasd_eckd_get_attrib(device, argp);
4028         case BIODASDSATTR:
4029                 return dasd_eckd_set_attrib(device, argp);
4030         case BIODASDPSRD:
4031                 return dasd_eckd_performance(device, argp);
4032         case BIODASDRLSE:
4033                 return dasd_eckd_release(device);
4034         case BIODASDRSRV:
4035                 return dasd_eckd_reserve(device);
4036         case BIODASDSLCK:
4037                 return dasd_eckd_steal_lock(device);
4038         case BIODASDSNID:
4039                 return dasd_eckd_snid(device, argp);
4040         case BIODASDSYMMIO:
4041                 return dasd_symm_io(device, argp);
4042         default:
4043                 return -ENOTTY;
4044         }
4045 }
4046 
4047 /*
4048  * Dump the range of CCWs into 'page' buffer
4049  * and return number of printed chars.
4050  */
4051 static int
4052 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4053 {
4054         int len, count;
4055         char *datap;
4056 
4057         len = 0;
4058         while (from <= to) {
4059                 len += sprintf(page + len, PRINTK_HEADER
4060                                " CCW %p: %08X %08X DAT:",
4061                                from, ((int *) from)[0], ((int *) from)[1]);
4062 
4063                 /* get pointer to data (consider IDALs) */
4064                 if (from->flags & CCW_FLAG_IDA)
4065                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4066                 else
4067                         datap = (char *) ((addr_t) from->cda);
4068 
4069                 /* dump data (max 32 bytes) */
4070                 for (count = 0; count < from->count && count < 32; count++) {
4071                         if (count % 8 == 0) len += sprintf(page + len, " ");
4072                         if (count % 4 == 0) len += sprintf(page + len, " ");
4073                         len += sprintf(page + len, "%02x", datap[count]);
4074                 }
4075                 len += sprintf(page + len, "\n");
4076                 from++;
4077         }
4078         return len;
4079 }
4080 
4081 static void
4082 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4083                          char *reason)
4084 {
4085         u64 *sense;
4086         u64 *stat;
4087 
4088         sense = (u64 *) dasd_get_sense(irb);
4089         stat = (u64 *) &irb->scsw;
4090         if (sense) {
4091                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4092                               "%016llx %016llx %016llx %016llx",
4093                               reason, *stat, *((u32 *) (stat + 1)),
4094                               sense[0], sense[1], sense[2], sense[3]);
4095         } else {
4096                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4097                               reason, *stat, *((u32 *) (stat + 1)),
4098                               "NO VALID SENSE");
4099         }
4100 }
4101 
4102 /*
4103  * Print sense data and related channel program.
4104  * Parts are printed because printk buffer is only 1024 bytes.
4105  */
4106 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4107                                  struct dasd_ccw_req *req, struct irb *irb)
4108 {
4109         char *page;
4110         struct ccw1 *first, *last, *fail, *from, *to;
4111         int len, sl, sct;
4112 
4113         page = (char *) get_zeroed_page(GFP_ATOMIC);
4114         if (page == NULL) {
4115                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4116                               "No memory to dump sense data\n");
4117                 return;
4118         }
4119         /* dump the sense data */
4120         len = sprintf(page, PRINTK_HEADER
4121                       " I/O status report for device %s:\n",
4122                       dev_name(&device->cdev->dev));
4123         len += sprintf(page + len, PRINTK_HEADER
4124                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4125                        "CS:%02X RC:%d\n",
4126                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4127                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4128                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4129                        req ? req->intrc : 0);
4130         len += sprintf(page + len, PRINTK_HEADER
4131                        " device %s: Failing CCW: %p\n",
4132                        dev_name(&device->cdev->dev),
4133                        (void *) (addr_t) irb->scsw.cmd.cpa);
4134         if (irb->esw.esw0.erw.cons) {
4135                 for (sl = 0; sl < 4; sl++) {
4136                         len += sprintf(page + len, PRINTK_HEADER
4137                                        " Sense(hex) %2d-%2d:",
4138                                        (8 * sl), ((8 * sl) + 7));
4139 
4140                         for (sct = 0; sct < 8; sct++) {
4141                                 len += sprintf(page + len, " %02x",
4142                                                irb->ecw[8 * sl + sct]);
4143                         }
4144                         len += sprintf(page + len, "\n");
4145                 }
4146 
4147                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4148                         /* 24 Byte Sense Data */
4149                         sprintf(page + len, PRINTK_HEADER
4150                                 " 24 Byte: %x MSG %x, "
4151                                 "%s MSGb to SYSOP\n",
4152                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4153                                 irb->ecw[1] & 0x10 ? "" : "no");
4154                 } else {
4155                         /* 32 Byte Sense Data */
4156                         sprintf(page + len, PRINTK_HEADER
4157                                 " 32 Byte: Format: %x "
4158                                 "Exception class %x\n",
4159                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4160                 }
4161         } else {
4162                 sprintf(page + len, PRINTK_HEADER
4163                         " SORRY - NO VALID SENSE AVAILABLE\n");
4164         }
4165         printk(KERN_ERR "%s", page);
4166 
4167         if (req) {
4168                 /* req == NULL for unsolicited interrupts */
4169                 /* dump the Channel Program (max 140 Bytes per line) */
4170                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4171                 first = req->cpaddr;
4172                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4173                 to = min(first + 6, last);
4174                 len = sprintf(page, PRINTK_HEADER
4175                               " Related CP in req: %p\n", req);
4176                 dasd_eckd_dump_ccw_range(first, to, page + len);
4177                 printk(KERN_ERR "%s", page);
4178 
4179                 /* print failing CCW area (maximum 4) */
4180                 /* scsw->cda is either valid or zero  */
4181                 len = 0;
4182                 from = ++to;
4183                 fail = (struct ccw1 *)(addr_t)
4184                                 irb->scsw.cmd.cpa; /* failing CCW */
4185                 if (from <  fail - 2) {
4186                         from = fail - 2;     /* there is a gap - print header */
4187                         len += sprintf(page, PRINTK_HEADER "......\n");
4188                 }
4189                 to = min(fail + 1, last);
4190                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4191 
4192                 /* print last CCWs (maximum 2) */
4193                 from = max(from, ++to);
4194                 if (from < last - 1) {
4195                         from = last - 1;     /* there is a gap - print header */
4196                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4197                 }
4198                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4199                 if (len > 0)
4200                         printk(KERN_ERR "%s", page);
4201         }
4202         free_page((unsigned long) page);
4203 }
4204 
4205 
4206 /*
4207  * Print sense data from a tcw.
4208  */
4209 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4210                                  struct dasd_ccw_req *req, struct irb *irb)
4211 {
4212         char *page;
4213         int len, sl, sct, residual;
4214         struct tsb *tsb;
4215         u8 *sense, *rcq;
4216 
4217         page = (char *) get_zeroed_page(GFP_ATOMIC);
4218         if (page == NULL) {
4219                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4220                             "No memory to dump sense data");
4221                 return;
4222         }
4223         /* dump the sense data */
4224         len = sprintf(page, PRINTK_HEADER
4225                       " I/O status report for device %s:\n",
4226                       dev_name(&device->cdev->dev));
4227         len += sprintf(page + len, PRINTK_HEADER
4228                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4229                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4230                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4231                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4232                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4233                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4234                        req ? req->intrc : 0);
4235         len += sprintf(page + len, PRINTK_HEADER
4236                        " device %s: Failing TCW: %p\n",
4237                        dev_name(&device->cdev->dev),
4238                        (void *) (addr_t) irb->scsw.tm.tcw);
4239 
4240         tsb = NULL;
4241         sense = NULL;
4242         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4243                 tsb = tcw_get_tsb(
4244                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4245 
4246         if (tsb) {
4247                 len += sprintf(page + len, PRINTK_HEADER
4248                                " tsb->length %d\n", tsb->length);
4249                 len += sprintf(page + len, PRINTK_HEADER
4250                                " tsb->flags %x\n", tsb->flags);
4251                 len += sprintf(page + len, PRINTK_HEADER
4252                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4253                 len += sprintf(page + len, PRINTK_HEADER
4254                                " tsb->count %d\n", tsb->count);
4255                 residual = tsb->count - 28;
4256                 len += sprintf(page + len, PRINTK_HEADER
4257                                " residual %d\n", residual);
4258 
4259                 switch (tsb->flags & 0x07) {
4260                 case 1: /* tsa_iostat */
4261                         len += sprintf(page + len, PRINTK_HEADER
4262                                " tsb->tsa.iostat.dev_time %d\n",
4263                                        tsb->tsa.iostat.dev_time);
4264                         len += sprintf(page + len, PRINTK_HEADER
4265                                " tsb->tsa.iostat.def_time %d\n",
4266                                        tsb->tsa.iostat.def_time);
4267                         len += sprintf(page + len, PRINTK_HEADER
4268                                " tsb->tsa.iostat.queue_time %d\n",
4269                                        tsb->tsa.iostat.queue_time);
4270                         len += sprintf(page + len, PRINTK_HEADER
4271                                " tsb->tsa.iostat.dev_busy_time %d\n",
4272                                        tsb->tsa.iostat.dev_busy_time);
4273                         len += sprintf(page + len, PRINTK_HEADER
4274                                " tsb->tsa.iostat.dev_act_time %d\n",
4275                                        tsb->tsa.iostat.dev_act_time);
4276                         sense = tsb->tsa.iostat.sense;
4277                         break;
4278                 case 2: /* ts_ddpc */
4279                         len += sprintf(page + len, PRINTK_HEADER
4280                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4281                         for (sl = 0; sl < 2; sl++) {
4282                                 len += sprintf(page + len, PRINTK_HEADER
4283                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4284                                                (8 * sl), ((8 * sl) + 7));
4285                                 rcq = tsb->tsa.ddpc.rcq;
4286                                 for (sct = 0; sct < 8; sct++) {
4287                                         len += sprintf(page + len, " %02x",
4288                                                        rcq[8 * sl + sct]);
4289                                 }
4290                                 len += sprintf(page + len, "\n");
4291                         }
4292                         sense = tsb->tsa.ddpc.sense;
4293                         break;
4294                 case 3: /* tsa_intrg */
4295                         len += sprintf(page + len, PRINTK_HEADER
4296                                       " tsb->tsa.intrg.: not supportet yet\n");
4297                         break;
4298                 }
4299 
4300                 if (sense) {
4301                         for (sl = 0; sl < 4; sl++) {
4302                                 len += sprintf(page + len, PRINTK_HEADER
4303                                                " Sense(hex) %2d-%2d:",
4304                                                (8 * sl), ((8 * sl) + 7));
4305                                 for (sct = 0; sct < 8; sct++) {
4306                                         len += sprintf(page + len, " %02x",
4307                                                        sense[8 * sl + sct]);
4308                                 }
4309                                 len += sprintf(page + len, "\n");
4310                         }
4311 
4312                         if (sense[27] & DASD_SENSE_BIT_0) {
4313                                 /* 24 Byte Sense Data */
4314                                 sprintf(page + len, PRINTK_HEADER
4315                                         " 24 Byte: %x MSG %x, "
4316                                         "%s MSGb to SYSOP\n",
4317                                         sense[7] >> 4, sense[7] & 0x0f,
4318                                         sense[1] & 0x10 ? "" : "no");
4319                         } else {
4320                                 /* 32 Byte Sense Data */
4321                                 sprintf(page + len, PRINTK_HEADER
4322                                         " 32 Byte: Format: %x "
4323                                         "Exception class %x\n",
4324                                         sense[6] & 0x0f, sense[22] >> 4);
4325                         }
4326                 } else {
4327                         sprintf(page + len, PRINTK_HEADER
4328                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4329                 }
4330         } else {
4331                 sprintf(page + len, PRINTK_HEADER
4332                         " SORRY - NO TSB DATA AVAILABLE\n");
4333         }
4334         printk(KERN_ERR "%s", page);
4335         free_page((unsigned long) page);
4336 }
4337 
4338 static void dasd_eckd_dump_sense(struct dasd_device *device,
4339                                  struct dasd_ccw_req *req, struct irb *irb)
4340 {
4341         if (scsw_is_tm(&irb->scsw))
4342                 dasd_eckd_dump_sense_tcw(device, req, irb);
4343         else
4344                 dasd_eckd_dump_sense_ccw(device, req, irb);
4345 }
4346 
4347 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4348 {
4349         /*
4350          * the device should be disconnected from our LCU structure
4351          * on restore we will reconnect it and reread LCU specific
4352          * information like PAV support that might have changed
4353          */
4354         dasd_alias_remove_device(device);
4355         dasd_alias_disconnect_device_from_lcu(device);
4356 
4357         return 0;
4358 }
4359 
4360 static int dasd_eckd_restore_device(struct dasd_device *device)
4361 {
4362         struct dasd_eckd_private *private;
4363         struct dasd_eckd_characteristics temp_rdc_data;
4364         int rc;
4365         struct dasd_uid temp_uid;
4366         unsigned long flags;
4367         unsigned long cqr_flags = 0;
4368 
4369         private = (struct dasd_eckd_private *) device->private;
4370 
4371         /* Read Configuration Data */
4372         dasd_eckd_read_conf(device);
4373 
4374         dasd_eckd_get_uid(device, &temp_uid);
4375         /* Generate device unique id */
4376         rc = dasd_eckd_generate_uid(device);
4377         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4378         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4379                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4380                         "changed\n");
4381         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4382         if (rc)
4383                 goto out_err;
4384 
4385         /* register lcu with alias handling, enable PAV if this is a new lcu */
4386         rc = dasd_alias_make_device_known_to_lcu(device);
4387         if (rc)
4388                 return rc;
4389 
4390         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4391         dasd_eckd_validate_server(device, cqr_flags);
4392 
4393         /* RE-Read Configuration Data */
4394         dasd_eckd_read_conf(device);
4395 
4396         /* Read Feature Codes */
4397         dasd_eckd_read_features(device);
4398 
4399         /* Read Device Characteristics */
4400         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4401                                          &temp_rdc_data, 64);
4402         if (rc) {
4403                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4404                                 "Read device characteristic failed, rc=%d", rc);
4405                 goto out_err;
4406         }
4407         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4408         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4409         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4410 
4411         /* add device to alias management */
4412         dasd_alias_add_device(device);
4413 
4414         return 0;
4415 
4416 out_err:
4417         return -1;
4418 }
4419 
4420 static int dasd_eckd_reload_device(struct dasd_device *device)
4421 {
4422         struct dasd_eckd_private *private;
4423         int rc, old_base;
4424         char print_uid[60];
4425         struct dasd_uid uid;
4426         unsigned long flags;
4427 
4428         private = (struct dasd_eckd_private *) device->private;
4429 
4430         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4431         old_base = private->uid.base_unit_addr;
4432         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4433 
4434         /* Read Configuration Data */
4435         rc = dasd_eckd_read_conf(device);
4436         if (rc)
4437                 goto out_err;
4438 
4439         rc = dasd_eckd_generate_uid(device);
4440         if (rc)
4441                 goto out_err;
4442         /*
4443          * update unit address configuration and
4444          * add device to alias management
4445          */
4446         dasd_alias_update_add_device(device);
4447 
4448         dasd_eckd_get_uid(device, &uid);
4449 
4450         if (old_base != uid.base_unit_addr) {
4451                 if (strlen(uid.vduit) > 0)
4452                         snprintf(print_uid, sizeof(print_uid),
4453                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4454                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4455                 else
4456                         snprintf(print_uid, sizeof(print_uid),
4457                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4458                                  uid.ssid, uid.base_unit_addr);
4459 
4460                 dev_info(&device->cdev->dev,
4461                          "An Alias device was reassigned to a new base device "
4462                          "with UID: %s\n", print_uid);
4463         }
4464         return 0;
4465 
4466 out_err:
4467         return -1;
4468 }
4469 
4470 static struct ccw_driver dasd_eckd_driver = {
4471         .driver = {
4472                 .name   = "dasd-eckd",
4473                 .owner  = THIS_MODULE,
4474         },
4475         .ids         = dasd_eckd_ids,
4476         .probe       = dasd_eckd_probe,
4477         .remove      = dasd_generic_remove,
4478         .set_offline = dasd_generic_set_offline,
4479         .set_online  = dasd_eckd_set_online,
4480         .notify      = dasd_generic_notify,
4481         .path_event  = dasd_generic_path_event,
4482         .shutdown    = dasd_generic_shutdown,
4483         .freeze      = dasd_generic_pm_freeze,
4484         .thaw        = dasd_generic_restore_device,
4485         .restore     = dasd_generic_restore_device,
4486         .uc_handler  = dasd_generic_uc_handler,
4487         .int_class   = IRQIO_DAS,
4488 };
4489 
4490 /*
4491  * max_blocks is dependent on the amount of storage that is available
4492  * in the static io buffer for each device. Currently each device has
4493  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4494  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4495  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4496  * addition we have one define extent ccw + 16 bytes of data and one
4497  * locate record ccw + 16 bytes of data. That makes:
4498  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4499  * We want to fit two into the available memory so that we can immediately
4500  * start the next request if one finishes off. That makes 249.5 blocks
4501  * for one request. Give a little safety and the result is 240.
4502  */
4503 static struct dasd_discipline dasd_eckd_discipline = {
4504         .owner = THIS_MODULE,
4505         .name = "ECKD",
4506         .ebcname = "ECKD",
4507         .max_blocks = 190,
4508         .check_device = dasd_eckd_check_characteristics,
4509         .uncheck_device = dasd_eckd_uncheck_device,
4510         .do_analysis = dasd_eckd_do_analysis,
4511         .verify_path = dasd_eckd_verify_path,
4512         .basic_to_ready = dasd_eckd_basic_to_ready,
4513         .online_to_ready = dasd_eckd_online_to_ready,
4514         .ready_to_basic = dasd_eckd_ready_to_basic,
4515         .fill_geometry = dasd_eckd_fill_geometry,
4516         .start_IO = dasd_start_IO,
4517         .term_IO = dasd_term_IO,
4518         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4519         .format_device = dasd_eckd_format_device,
4520         .erp_action = dasd_eckd_erp_action,
4521         .erp_postaction = dasd_eckd_erp_postaction,
4522         .check_for_device_change = dasd_eckd_check_for_device_change,
4523         .build_cp = dasd_eckd_build_alias_cp,
4524         .free_cp = dasd_eckd_free_alias_cp,
4525         .dump_sense = dasd_eckd_dump_sense,
4526         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4527         .fill_info = dasd_eckd_fill_info,
4528         .ioctl = dasd_eckd_ioctl,
4529         .freeze = dasd_eckd_pm_freeze,
4530         .restore = dasd_eckd_restore_device,
4531         .reload = dasd_eckd_reload_device,
4532         .get_uid = dasd_eckd_get_uid,
4533         .kick_validate = dasd_eckd_kick_validate_server,
4534 };
4535 
4536 static int __init
4537 dasd_eckd_init(void)
4538 {
4539         int ret;
4540 
4541         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4542         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4543                                    GFP_KERNEL | GFP_DMA);
4544         if (!dasd_reserve_req)
4545                 return -ENOMEM;
4546         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4547                                    GFP_KERNEL | GFP_DMA);
4548         if (!path_verification_worker) {
4549                 kfree(dasd_reserve_req);
4550                 return -ENOMEM;
4551         }
4552         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
4553         if (!rawpadpage) {
4554                 kfree(path_verification_worker);
4555                 kfree(dasd_reserve_req);
4556                 return -ENOMEM;
4557         }
4558         ret = ccw_driver_register(&dasd_eckd_driver);
4559         if (!ret)
4560                 wait_for_device_probe();
4561         else {
4562                 kfree(path_verification_worker);
4563                 kfree(dasd_reserve_req);
4564                 free_page((unsigned long)rawpadpage);
4565         }
4566         return ret;
4567 }
4568 
4569 static void __exit
4570 dasd_eckd_cleanup(void)
4571 {
4572         ccw_driver_unregister(&dasd_eckd_driver);
4573         kfree(path_verification_worker);
4574         kfree(dasd_reserve_req);
4575         free_page((unsigned long)rawpadpage);
4576 }
4577 
4578 module_init(dasd_eckd_init);
4579 module_exit(dasd_eckd_cleanup);
4580 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us