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Merge branch 'r6040-next'
[linux/fpc-iii.git] / drivers / scsi / sd.c
blob60bff78e9ead8703e1e912307c504330d1a76d1f
1 /*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <linux/pr.h>
55 #include <asm/uaccess.h>
56 #include <asm/unaligned.h>
57
58 #include <scsi/scsi.h>
59 #include <scsi/scsi_cmnd.h>
60 #include <scsi/scsi_dbg.h>
61 #include <scsi/scsi_device.h>
62 #include <scsi/scsi_driver.h>
63 #include <scsi/scsi_eh.h>
64 #include <scsi/scsi_host.h>
65 #include <scsi/scsi_ioctl.h>
66 #include <scsi/scsicam.h>
67
68 #include "sd.h"
69 #include "scsi_priv.h"
70 #include "scsi_logging.h"
71
72 MODULE_AUTHOR("Eric Youngdale");
73 MODULE_DESCRIPTION("SCSI disk (sd) driver");
74 MODULE_LICENSE("GPL");
75
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
95
96 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
97 #define SD_MINORS 16
98 #else
99 #define SD_MINORS 0
100 #endif
101
102 static void sd_config_discard(struct scsi_disk *, unsigned int);
103 static void sd_config_write_same(struct scsi_disk *);
104 static int sd_revalidate_disk(struct gendisk *);
105 static void sd_unlock_native_capacity(struct gendisk *disk);
106 static int sd_probe(struct device *);
107 static int sd_remove(struct device *);
108 static void sd_shutdown(struct device *);
109 static int sd_suspend_system(struct device *);
110 static int sd_suspend_runtime(struct device *);
111 static int sd_resume(struct device *);
112 static void sd_rescan(struct device *);
113 static int sd_init_command(struct scsi_cmnd *SCpnt);
114 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
115 static int sd_done(struct scsi_cmnd *);
116 static int sd_eh_action(struct scsi_cmnd *, int);
117 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
118 static void scsi_disk_release(struct device *cdev);
119 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
120 static void sd_print_result(const struct scsi_disk *, const char *, int);
121
122 static DEFINE_SPINLOCK(sd_index_lock);
123 static DEFINE_IDA(sd_index_ida);
124
125 /* This semaphore is used to mediate the 0->1 reference get in the
126 * face of object destruction (i.e. we can't allow a get on an
127 * object after last put) */
128 static DEFINE_MUTEX(sd_ref_mutex);
129
130 static struct kmem_cache *sd_cdb_cache;
131 static mempool_t *sd_cdb_pool;
132
133 static const char *sd_cache_types[] = {
134 "write through", "none", "write back",
135 "write back, no read (daft)"
136 };
137
138 static void sd_set_flush_flag(struct scsi_disk *sdkp)
139 {
140 bool wc = false, fua = false;
141
142 if (sdkp->WCE) {
143 wc = true;
144 if (sdkp->DPOFUA)
145 fua = true;
146 }
147
148 blk_queue_write_cache(sdkp->disk->queue, wc, fua);
149 }
150
151 static ssize_t
152 cache_type_store(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
154 {
155 int i, ct = -1, rcd, wce, sp;
156 struct scsi_disk *sdkp = to_scsi_disk(dev);
157 struct scsi_device *sdp = sdkp->device;
158 char buffer[64];
159 char *buffer_data;
160 struct scsi_mode_data data;
161 struct scsi_sense_hdr sshdr;
162 static const char temp[] = "temporary ";
163 int len;
164
165 if (sdp->type != TYPE_DISK)
166 /* no cache control on RBC devices; theoretically they
167 * can do it, but there's probably so many exceptions
168 * it's not worth the risk */
169 return -EINVAL;
170
171 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
172 buf += sizeof(temp) - 1;
173 sdkp->cache_override = 1;
174 } else {
175 sdkp->cache_override = 0;
176 }
177
178 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
179 len = strlen(sd_cache_types[i]);
180 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
181 buf[len] == '\n') {
182 ct = i;
183 break;
184 }
185 }
186 if (ct < 0)
187 return -EINVAL;
188 rcd = ct & 0x01 ? 1 : 0;
189 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
190
191 if (sdkp->cache_override) {
192 sdkp->WCE = wce;
193 sdkp->RCD = rcd;
194 sd_set_flush_flag(sdkp);
195 return count;
196 }
197
198 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
199 SD_MAX_RETRIES, &data, NULL))
200 return -EINVAL;
201 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
202 data.block_descriptor_length);
203 buffer_data = buffer + data.header_length +
204 data.block_descriptor_length;
205 buffer_data[2] &= ~0x05;
206 buffer_data[2] |= wce << 2 | rcd;
207 sp = buffer_data[0] & 0x80 ? 1 : 0;
208 buffer_data[0] &= ~0x80;
209
210 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
211 SD_MAX_RETRIES, &data, &sshdr)) {
212 if (scsi_sense_valid(&sshdr))
213 sd_print_sense_hdr(sdkp, &sshdr);
214 return -EINVAL;
215 }
216 revalidate_disk(sdkp->disk);
217 return count;
218 }
219
220 static ssize_t
221 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
222 char *buf)
223 {
224 struct scsi_disk *sdkp = to_scsi_disk(dev);
225 struct scsi_device *sdp = sdkp->device;
226
227 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
228 }
229
230 static ssize_t
231 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
233 {
234 struct scsi_disk *sdkp = to_scsi_disk(dev);
235 struct scsi_device *sdp = sdkp->device;
236
237 if (!capable(CAP_SYS_ADMIN))
238 return -EACCES;
239
240 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
241
242 return count;
243 }
244 static DEVICE_ATTR_RW(manage_start_stop);
245
246 static ssize_t
247 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
248 {
249 struct scsi_disk *sdkp = to_scsi_disk(dev);
250
251 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
252 }
253
254 static ssize_t
255 allow_restart_store(struct device *dev, struct device_attribute *attr,
256 const char *buf, size_t count)
257 {
258 struct scsi_disk *sdkp = to_scsi_disk(dev);
259 struct scsi_device *sdp = sdkp->device;
260
261 if (!capable(CAP_SYS_ADMIN))
262 return -EACCES;
263
264 if (sdp->type != TYPE_DISK)
265 return -EINVAL;
266
267 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
268
269 return count;
270 }
271 static DEVICE_ATTR_RW(allow_restart);
272
273 static ssize_t
274 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
275 {
276 struct scsi_disk *sdkp = to_scsi_disk(dev);
277 int ct = sdkp->RCD + 2*sdkp->WCE;
278
279 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
280 }
281 static DEVICE_ATTR_RW(cache_type);
282
283 static ssize_t
284 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
285 {
286 struct scsi_disk *sdkp = to_scsi_disk(dev);
287
288 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
289 }
290 static DEVICE_ATTR_RO(FUA);
291
292 static ssize_t
293 protection_type_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
295 {
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
297
298 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
299 }
300
301 static ssize_t
302 protection_type_store(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t count)
304 {
305 struct scsi_disk *sdkp = to_scsi_disk(dev);
306 unsigned int val;
307 int err;
308
309 if (!capable(CAP_SYS_ADMIN))
310 return -EACCES;
311
312 err = kstrtouint(buf, 10, &val);
313
314 if (err)
315 return err;
316
317 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
318 sdkp->protection_type = val;
319
320 return count;
321 }
322 static DEVICE_ATTR_RW(protection_type);
323
324 static ssize_t
325 protection_mode_show(struct device *dev, struct device_attribute *attr,
326 char *buf)
327 {
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329 struct scsi_device *sdp = sdkp->device;
330 unsigned int dif, dix;
331
332 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
333 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
334
335 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
336 dif = 0;
337 dix = 1;
338 }
339
340 if (!dif && !dix)
341 return snprintf(buf, 20, "none\n");
342
343 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
344 }
345 static DEVICE_ATTR_RO(protection_mode);
346
347 static ssize_t
348 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
349 {
350 struct scsi_disk *sdkp = to_scsi_disk(dev);
351
352 return snprintf(buf, 20, "%u\n", sdkp->ATO);
353 }
354 static DEVICE_ATTR_RO(app_tag_own);
355
356 static ssize_t
357 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
358 char *buf)
359 {
360 struct scsi_disk *sdkp = to_scsi_disk(dev);
361
362 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
363 }
364 static DEVICE_ATTR_RO(thin_provisioning);
365
366 static const char *lbp_mode[] = {
367 [SD_LBP_FULL] = "full",
368 [SD_LBP_UNMAP] = "unmap",
369 [SD_LBP_WS16] = "writesame_16",
370 [SD_LBP_WS10] = "writesame_10",
371 [SD_LBP_ZERO] = "writesame_zero",
372 [SD_LBP_DISABLE] = "disabled",
373 };
374
375 static ssize_t
376 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
377 char *buf)
378 {
379 struct scsi_disk *sdkp = to_scsi_disk(dev);
380
381 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
382 }
383
384 static ssize_t
385 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
386 const char *buf, size_t count)
387 {
388 struct scsi_disk *sdkp = to_scsi_disk(dev);
389 struct scsi_device *sdp = sdkp->device;
390
391 if (!capable(CAP_SYS_ADMIN))
392 return -EACCES;
393
394 if (sdp->type != TYPE_DISK)
395 return -EINVAL;
396
397 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
398 sd_config_discard(sdkp, SD_LBP_UNMAP);
399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
400 sd_config_discard(sdkp, SD_LBP_WS16);
401 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
402 sd_config_discard(sdkp, SD_LBP_WS10);
403 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
404 sd_config_discard(sdkp, SD_LBP_ZERO);
405 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
406 sd_config_discard(sdkp, SD_LBP_DISABLE);
407 else
408 return -EINVAL;
409
410 return count;
411 }
412 static DEVICE_ATTR_RW(provisioning_mode);
413
414 static ssize_t
415 max_medium_access_timeouts_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417 {
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
421 }
422
423 static ssize_t
424 max_medium_access_timeouts_store(struct device *dev,
425 struct device_attribute *attr, const char *buf,
426 size_t count)
427 {
428 struct scsi_disk *sdkp = to_scsi_disk(dev);
429 int err;
430
431 if (!capable(CAP_SYS_ADMIN))
432 return -EACCES;
433
434 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
435
436 return err ? err : count;
437 }
438 static DEVICE_ATTR_RW(max_medium_access_timeouts);
439
440 static ssize_t
441 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
442 char *buf)
443 {
444 struct scsi_disk *sdkp = to_scsi_disk(dev);
445
446 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
447 }
448
449 static ssize_t
450 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
451 const char *buf, size_t count)
452 {
453 struct scsi_disk *sdkp = to_scsi_disk(dev);
454 struct scsi_device *sdp = sdkp->device;
455 unsigned long max;
456 int err;
457
458 if (!capable(CAP_SYS_ADMIN))
459 return -EACCES;
460
461 if (sdp->type != TYPE_DISK)
462 return -EINVAL;
463
464 err = kstrtoul(buf, 10, &max);
465
466 if (err)
467 return err;
468
469 if (max == 0)
470 sdp->no_write_same = 1;
471 else if (max <= SD_MAX_WS16_BLOCKS) {
472 sdp->no_write_same = 0;
473 sdkp->max_ws_blocks = max;
474 }
475
476 sd_config_write_same(sdkp);
477
478 return count;
479 }
480 static DEVICE_ATTR_RW(max_write_same_blocks);
481
482 static struct attribute *sd_disk_attrs[] = {
483 &dev_attr_cache_type.attr,
484 &dev_attr_FUA.attr,
485 &dev_attr_allow_restart.attr,
486 &dev_attr_manage_start_stop.attr,
487 &dev_attr_protection_type.attr,
488 &dev_attr_protection_mode.attr,
489 &dev_attr_app_tag_own.attr,
490 &dev_attr_thin_provisioning.attr,
491 &dev_attr_provisioning_mode.attr,
492 &dev_attr_max_write_same_blocks.attr,
493 &dev_attr_max_medium_access_timeouts.attr,
494 NULL,
495 };
496 ATTRIBUTE_GROUPS(sd_disk);
497
498 static struct class sd_disk_class = {
499 .name = "scsi_disk",
500 .owner = THIS_MODULE,
501 .dev_release = scsi_disk_release,
502 .dev_groups = sd_disk_groups,
503 };
504
505 static const struct dev_pm_ops sd_pm_ops = {
506 .suspend = sd_suspend_system,
507 .resume = sd_resume,
508 .poweroff = sd_suspend_system,
509 .restore = sd_resume,
510 .runtime_suspend = sd_suspend_runtime,
511 .runtime_resume = sd_resume,
512 };
513
514 static struct scsi_driver sd_template = {
515 .gendrv = {
516 .name = "sd",
517 .owner = THIS_MODULE,
518 .probe = sd_probe,
519 .remove = sd_remove,
520 .shutdown = sd_shutdown,
521 .pm = &sd_pm_ops,
522 },
523 .rescan = sd_rescan,
524 .init_command = sd_init_command,
525 .uninit_command = sd_uninit_command,
526 .done = sd_done,
527 .eh_action = sd_eh_action,
528 };
529
530 /*
531 * Dummy kobj_map->probe function.
532 * The default ->probe function will call modprobe, which is
533 * pointless as this module is already loaded.
534 */
535 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
536 {
537 return NULL;
538 }
539
540 /*
541 * Device no to disk mapping:
542 *
543 * major disc2 disc p1
544 * |............|.............|....|....| <- dev_t
545 * 31 20 19 8 7 4 3 0
546 *
547 * Inside a major, we have 16k disks, however mapped non-
548 * contiguously. The first 16 disks are for major0, the next
549 * ones with major1, ... Disk 256 is for major0 again, disk 272
550 * for major1, ...
551 * As we stay compatible with our numbering scheme, we can reuse
552 * the well-know SCSI majors 8, 65--71, 136--143.
553 */
554 static int sd_major(int major_idx)
555 {
556 switch (major_idx) {
557 case 0:
558 return SCSI_DISK0_MAJOR;
559 case 1 ... 7:
560 return SCSI_DISK1_MAJOR + major_idx - 1;
561 case 8 ... 15:
562 return SCSI_DISK8_MAJOR + major_idx - 8;
563 default:
564 BUG();
565 return 0; /* shut up gcc */
566 }
567 }
568
569 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
570 {
571 struct scsi_disk *sdkp = NULL;
572
573 mutex_lock(&sd_ref_mutex);
574
575 if (disk->private_data) {
576 sdkp = scsi_disk(disk);
577 if (scsi_device_get(sdkp->device) == 0)
578 get_device(&sdkp->dev);
579 else
580 sdkp = NULL;
581 }
582 mutex_unlock(&sd_ref_mutex);
583 return sdkp;
584 }
585
586 static void scsi_disk_put(struct scsi_disk *sdkp)
587 {
588 struct scsi_device *sdev = sdkp->device;
589
590 mutex_lock(&sd_ref_mutex);
591 put_device(&sdkp->dev);
592 scsi_device_put(sdev);
593 mutex_unlock(&sd_ref_mutex);
594 }
595
596 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
597 unsigned int dix, unsigned int dif)
598 {
599 struct bio *bio = scmd->request->bio;
600 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
601 unsigned int protect = 0;
602
603 if (dix) { /* DIX Type 0, 1, 2, 3 */
604 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
605 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
606
607 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
608 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
609 }
610
611 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
612 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
613
614 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
615 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
616 }
617
618 if (dif) { /* DIX/DIF Type 1, 2, 3 */
619 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
620
621 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
622 protect = 3 << 5; /* Disable target PI checking */
623 else
624 protect = 1 << 5; /* Enable target PI checking */
625 }
626
627 scsi_set_prot_op(scmd, prot_op);
628 scsi_set_prot_type(scmd, dif);
629 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
630
631 return protect;
632 }
633
634 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
635 {
636 struct request_queue *q = sdkp->disk->queue;
637 unsigned int logical_block_size = sdkp->device->sector_size;
638 unsigned int max_blocks = 0;
639
640 q->limits.discard_zeroes_data = 0;
641
642 /*
643 * When LBPRZ is reported, discard alignment and granularity
644 * must be fixed to the logical block size. Otherwise the block
645 * layer will drop misaligned portions of the request which can
646 * lead to data corruption. If LBPRZ is not set, we honor the
647 * device preference.
648 */
649 if (sdkp->lbprz) {
650 q->limits.discard_alignment = 0;
651 q->limits.discard_granularity = logical_block_size;
652 } else {
653 q->limits.discard_alignment = sdkp->unmap_alignment *
654 logical_block_size;
655 q->limits.discard_granularity =
656 max(sdkp->physical_block_size,
657 sdkp->unmap_granularity * logical_block_size);
658 }
659
660 sdkp->provisioning_mode = mode;
661
662 switch (mode) {
663
664 case SD_LBP_DISABLE:
665 blk_queue_max_discard_sectors(q, 0);
666 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
667 return;
668
669 case SD_LBP_UNMAP:
670 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
671 (u32)SD_MAX_WS16_BLOCKS);
672 break;
673
674 case SD_LBP_WS16:
675 max_blocks = min_not_zero(sdkp->max_ws_blocks,
676 (u32)SD_MAX_WS16_BLOCKS);
677 q->limits.discard_zeroes_data = sdkp->lbprz;
678 break;
679
680 case SD_LBP_WS10:
681 max_blocks = min_not_zero(sdkp->max_ws_blocks,
682 (u32)SD_MAX_WS10_BLOCKS);
683 q->limits.discard_zeroes_data = sdkp->lbprz;
684 break;
685
686 case SD_LBP_ZERO:
687 max_blocks = min_not_zero(sdkp->max_ws_blocks,
688 (u32)SD_MAX_WS10_BLOCKS);
689 q->limits.discard_zeroes_data = 1;
690 break;
691 }
692
693 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
694 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
695 }
696
697 /**
698 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
699 * @sdp: scsi device to operate one
700 * @rq: Request to prepare
701 *
702 * Will issue either UNMAP or WRITE SAME(16) depending on preference
703 * indicated by target device.
704 **/
705 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
706 {
707 struct request *rq = cmd->request;
708 struct scsi_device *sdp = cmd->device;
709 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
710 sector_t sector = blk_rq_pos(rq);
711 unsigned int nr_sectors = blk_rq_sectors(rq);
712 unsigned int nr_bytes = blk_rq_bytes(rq);
713 unsigned int len;
714 int ret;
715 char *buf;
716 struct page *page;
717
718 sector >>= ilog2(sdp->sector_size) - 9;
719 nr_sectors >>= ilog2(sdp->sector_size) - 9;
720
721 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
722 if (!page)
723 return BLKPREP_DEFER;
724
725 switch (sdkp->provisioning_mode) {
726 case SD_LBP_UNMAP:
727 buf = page_address(page);
728
729 cmd->cmd_len = 10;
730 cmd->cmnd[0] = UNMAP;
731 cmd->cmnd[8] = 24;
732
733 put_unaligned_be16(6 + 16, &buf[0]);
734 put_unaligned_be16(16, &buf[2]);
735 put_unaligned_be64(sector, &buf[8]);
736 put_unaligned_be32(nr_sectors, &buf[16]);
737
738 len = 24;
739 break;
740
741 case SD_LBP_WS16:
742 cmd->cmd_len = 16;
743 cmd->cmnd[0] = WRITE_SAME_16;
744 cmd->cmnd[1] = 0x8; /* UNMAP */
745 put_unaligned_be64(sector, &cmd->cmnd[2]);
746 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
747
748 len = sdkp->device->sector_size;
749 break;
750
751 case SD_LBP_WS10:
752 case SD_LBP_ZERO:
753 cmd->cmd_len = 10;
754 cmd->cmnd[0] = WRITE_SAME;
755 if (sdkp->provisioning_mode == SD_LBP_WS10)
756 cmd->cmnd[1] = 0x8; /* UNMAP */
757 put_unaligned_be32(sector, &cmd->cmnd[2]);
758 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
759
760 len = sdkp->device->sector_size;
761 break;
762
763 default:
764 ret = BLKPREP_INVALID;
765 goto out;
766 }
767
768 rq->completion_data = page;
769 rq->timeout = SD_TIMEOUT;
770
771 cmd->transfersize = len;
772 cmd->allowed = SD_MAX_RETRIES;
773
774 /*
775 * Initially __data_len is set to the amount of data that needs to be
776 * transferred to the target. This amount depends on whether WRITE SAME
777 * or UNMAP is being used. After the scatterlist has been mapped by
778 * scsi_init_io() we set __data_len to the size of the area to be
779 * discarded on disk. This allows us to report completion on the full
780 * amount of blocks described by the request.
781 */
782 blk_add_request_payload(rq, page, 0, len);
783 ret = scsi_init_io(cmd);
784 rq->__data_len = nr_bytes;
785
786 out:
787 if (ret != BLKPREP_OK)
788 __free_page(page);
789 return ret;
790 }
791
792 static void sd_config_write_same(struct scsi_disk *sdkp)
793 {
794 struct request_queue *q = sdkp->disk->queue;
795 unsigned int logical_block_size = sdkp->device->sector_size;
796
797 if (sdkp->device->no_write_same) {
798 sdkp->max_ws_blocks = 0;
799 goto out;
800 }
801
802 /* Some devices can not handle block counts above 0xffff despite
803 * supporting WRITE SAME(16). Consequently we default to 64k
804 * blocks per I/O unless the device explicitly advertises a
805 * bigger limit.
806 */
807 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
808 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
809 (u32)SD_MAX_WS16_BLOCKS);
810 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
811 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
812 (u32)SD_MAX_WS10_BLOCKS);
813 else {
814 sdkp->device->no_write_same = 1;
815 sdkp->max_ws_blocks = 0;
816 }
817
818 out:
819 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
820 (logical_block_size >> 9));
821 }
822
823 /**
824 * sd_setup_write_same_cmnd - write the same data to multiple blocks
825 * @cmd: command to prepare
826 *
827 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
828 * preference indicated by target device.
829 **/
830 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
831 {
832 struct request *rq = cmd->request;
833 struct scsi_device *sdp = cmd->device;
834 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
835 struct bio *bio = rq->bio;
836 sector_t sector = blk_rq_pos(rq);
837 unsigned int nr_sectors = blk_rq_sectors(rq);
838 unsigned int nr_bytes = blk_rq_bytes(rq);
839 int ret;
840
841 if (sdkp->device->no_write_same)
842 return BLKPREP_INVALID;
843
844 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
845
846 sector >>= ilog2(sdp->sector_size) - 9;
847 nr_sectors >>= ilog2(sdp->sector_size) - 9;
848
849 rq->timeout = SD_WRITE_SAME_TIMEOUT;
850
851 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
852 cmd->cmd_len = 16;
853 cmd->cmnd[0] = WRITE_SAME_16;
854 put_unaligned_be64(sector, &cmd->cmnd[2]);
855 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
856 } else {
857 cmd->cmd_len = 10;
858 cmd->cmnd[0] = WRITE_SAME;
859 put_unaligned_be32(sector, &cmd->cmnd[2]);
860 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
861 }
862
863 cmd->transfersize = sdp->sector_size;
864 cmd->allowed = SD_MAX_RETRIES;
865
866 /*
867 * For WRITE_SAME the data transferred in the DATA IN buffer is
868 * different from the amount of data actually written to the target.
869 *
870 * We set up __data_len to the amount of data transferred from the
871 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
872 * to transfer a single sector of data first, but then reset it to
873 * the amount of data to be written right after so that the I/O path
874 * knows how much to actually write.
875 */
876 rq->__data_len = sdp->sector_size;
877 ret = scsi_init_io(cmd);
878 rq->__data_len = nr_bytes;
879 return ret;
880 }
881
882 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
883 {
884 struct request *rq = cmd->request;
885
886 /* flush requests don't perform I/O, zero the S/G table */
887 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
888
889 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
890 cmd->cmd_len = 10;
891 cmd->transfersize = 0;
892 cmd->allowed = SD_MAX_RETRIES;
893
894 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
895 return BLKPREP_OK;
896 }
897
898 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
899 {
900 struct request *rq = SCpnt->request;
901 struct scsi_device *sdp = SCpnt->device;
902 struct gendisk *disk = rq->rq_disk;
903 struct scsi_disk *sdkp;
904 sector_t block = blk_rq_pos(rq);
905 sector_t threshold;
906 unsigned int this_count = blk_rq_sectors(rq);
907 unsigned int dif, dix;
908 int ret;
909 unsigned char protect;
910
911 ret = scsi_init_io(SCpnt);
912 if (ret != BLKPREP_OK)
913 goto out;
914 SCpnt = rq->special;
915 sdkp = scsi_disk(disk);
916
917 /* from here on until we're complete, any goto out
918 * is used for a killable error condition */
919 ret = BLKPREP_KILL;
920
921 SCSI_LOG_HLQUEUE(1,
922 scmd_printk(KERN_INFO, SCpnt,
923 "%s: block=%llu, count=%d\n",
924 __func__, (unsigned long long)block, this_count));
925
926 if (!sdp || !scsi_device_online(sdp) ||
927 block + blk_rq_sectors(rq) > get_capacity(disk)) {
928 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
929 "Finishing %u sectors\n",
930 blk_rq_sectors(rq)));
931 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
932 "Retry with 0x%p\n", SCpnt));
933 goto out;
934 }
935
936 if (sdp->changed) {
937 /*
938 * quietly refuse to do anything to a changed disc until
939 * the changed bit has been reset
940 */
941 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
942 goto out;
943 }
944
945 /*
946 * Some SD card readers can't handle multi-sector accesses which touch
947 * the last one or two hardware sectors. Split accesses as needed.
948 */
949 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
950 (sdp->sector_size / 512);
951
952 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
953 if (block < threshold) {
954 /* Access up to the threshold but not beyond */
955 this_count = threshold - block;
956 } else {
957 /* Access only a single hardware sector */
958 this_count = sdp->sector_size / 512;
959 }
960 }
961
962 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
963 (unsigned long long)block));
964
965 /*
966 * If we have a 1K hardware sectorsize, prevent access to single
967 * 512 byte sectors. In theory we could handle this - in fact
968 * the scsi cdrom driver must be able to handle this because
969 * we typically use 1K blocksizes, and cdroms typically have
970 * 2K hardware sectorsizes. Of course, things are simpler
971 * with the cdrom, since it is read-only. For performance
972 * reasons, the filesystems should be able to handle this
973 * and not force the scsi disk driver to use bounce buffers
974 * for this.
975 */
976 if (sdp->sector_size == 1024) {
977 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
978 scmd_printk(KERN_ERR, SCpnt,
979 "Bad block number requested\n");
980 goto out;
981 } else {
982 block = block >> 1;
983 this_count = this_count >> 1;
984 }
985 }
986 if (sdp->sector_size == 2048) {
987 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
988 scmd_printk(KERN_ERR, SCpnt,
989 "Bad block number requested\n");
990 goto out;
991 } else {
992 block = block >> 2;
993 this_count = this_count >> 2;
994 }
995 }
996 if (sdp->sector_size == 4096) {
997 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
998 scmd_printk(KERN_ERR, SCpnt,
999 "Bad block number requested\n");
1000 goto out;
1001 } else {
1002 block = block >> 3;
1003 this_count = this_count >> 3;
1004 }
1005 }
1006 if (rq_data_dir(rq) == WRITE) {
1007 SCpnt->cmnd[0] = WRITE_6;
1008
1009 if (blk_integrity_rq(rq))
1010 sd_dif_prepare(SCpnt);
1011
1012 } else if (rq_data_dir(rq) == READ) {
1013 SCpnt->cmnd[0] = READ_6;
1014 } else {
1015 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
1016 goto out;
1017 }
1018
1019 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1020 "%s %d/%u 512 byte blocks.\n",
1021 (rq_data_dir(rq) == WRITE) ?
1022 "writing" : "reading", this_count,
1023 blk_rq_sectors(rq)));
1024
1025 dix = scsi_prot_sg_count(SCpnt);
1026 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1027
1028 if (dif || dix)
1029 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1030 else
1031 protect = 0;
1032
1033 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
1034 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1035
1036 if (unlikely(SCpnt->cmnd == NULL)) {
1037 ret = BLKPREP_DEFER;
1038 goto out;
1039 }
1040
1041 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1042 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1043 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1044 SCpnt->cmnd[7] = 0x18;
1045 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1046 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1047
1048 /* LBA */
1049 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1050 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1051 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1052 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1053 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1054 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1055 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1056 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1057
1058 /* Expected Indirect LBA */
1059 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1060 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1061 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1062 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1063
1064 /* Transfer length */
1065 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1066 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1067 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1068 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1069 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1070 SCpnt->cmnd[0] += READ_16 - READ_6;
1071 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1072 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1073 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1074 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1075 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1076 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1077 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1078 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1079 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1080 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1081 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1082 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1083 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1084 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1085 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1086 scsi_device_protection(SCpnt->device) ||
1087 SCpnt->device->use_10_for_rw) {
1088 SCpnt->cmnd[0] += READ_10 - READ_6;
1089 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1090 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1091 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1092 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1093 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1094 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1095 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1096 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1097 } else {
1098 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1099 /*
1100 * This happens only if this drive failed
1101 * 10byte rw command with ILLEGAL_REQUEST
1102 * during operation and thus turned off
1103 * use_10_for_rw.
1104 */
1105 scmd_printk(KERN_ERR, SCpnt,
1106 "FUA write on READ/WRITE(6) drive\n");
1107 goto out;
1108 }
1109
1110 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1111 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1112 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1113 SCpnt->cmnd[4] = (unsigned char) this_count;
1114 SCpnt->cmnd[5] = 0;
1115 }
1116 SCpnt->sdb.length = this_count * sdp->sector_size;
1117
1118 /*
1119 * We shouldn't disconnect in the middle of a sector, so with a dumb
1120 * host adapter, it's safe to assume that we can at least transfer
1121 * this many bytes between each connect / disconnect.
1122 */
1123 SCpnt->transfersize = sdp->sector_size;
1124 SCpnt->underflow = this_count << 9;
1125 SCpnt->allowed = SD_MAX_RETRIES;
1126
1127 /*
1128 * This indicates that the command is ready from our end to be
1129 * queued.
1130 */
1131 ret = BLKPREP_OK;
1132 out:
1133 return ret;
1134 }
1135
1136 static int sd_init_command(struct scsi_cmnd *cmd)
1137 {
1138 struct request *rq = cmd->request;
1139
1140 if (rq->cmd_flags & REQ_DISCARD)
1141 return sd_setup_discard_cmnd(cmd);
1142 else if (rq->cmd_flags & REQ_WRITE_SAME)
1143 return sd_setup_write_same_cmnd(cmd);
1144 else if (rq->cmd_flags & REQ_FLUSH)
1145 return sd_setup_flush_cmnd(cmd);
1146 else
1147 return sd_setup_read_write_cmnd(cmd);
1148 }
1149
1150 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1151 {
1152 struct request *rq = SCpnt->request;
1153
1154 if (rq->cmd_flags & REQ_DISCARD)
1155 __free_page(rq->completion_data);
1156
1157 if (SCpnt->cmnd != rq->cmd) {
1158 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1159 SCpnt->cmnd = NULL;
1160 SCpnt->cmd_len = 0;
1161 }
1162 }
1163
1164 /**
1165 * sd_open - open a scsi disk device
1166 * @inode: only i_rdev member may be used
1167 * @filp: only f_mode and f_flags may be used
1168 *
1169 * Returns 0 if successful. Returns a negated errno value in case
1170 * of error.
1171 *
1172 * Note: This can be called from a user context (e.g. fsck(1) )
1173 * or from within the kernel (e.g. as a result of a mount(1) ).
1174 * In the latter case @inode and @filp carry an abridged amount
1175 * of information as noted above.
1176 *
1177 * Locking: called with bdev->bd_mutex held.
1178 **/
1179 static int sd_open(struct block_device *bdev, fmode_t mode)
1180 {
1181 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1182 struct scsi_device *sdev;
1183 int retval;
1184
1185 if (!sdkp)
1186 return -ENXIO;
1187
1188 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1189
1190 sdev = sdkp->device;
1191
1192 /*
1193 * If the device is in error recovery, wait until it is done.
1194 * If the device is offline, then disallow any access to it.
1195 */
1196 retval = -ENXIO;
1197 if (!scsi_block_when_processing_errors(sdev))
1198 goto error_out;
1199
1200 if (sdev->removable || sdkp->write_prot)
1201 check_disk_change(bdev);
1202
1203 /*
1204 * If the drive is empty, just let the open fail.
1205 */
1206 retval = -ENOMEDIUM;
1207 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1208 goto error_out;
1209
1210 /*
1211 * If the device has the write protect tab set, have the open fail
1212 * if the user expects to be able to write to the thing.
1213 */
1214 retval = -EROFS;
1215 if (sdkp->write_prot && (mode & FMODE_WRITE))
1216 goto error_out;
1217
1218 /*
1219 * It is possible that the disk changing stuff resulted in
1220 * the device being taken offline. If this is the case,
1221 * report this to the user, and don't pretend that the
1222 * open actually succeeded.
1223 */
1224 retval = -ENXIO;
1225 if (!scsi_device_online(sdev))
1226 goto error_out;
1227
1228 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1229 if (scsi_block_when_processing_errors(sdev))
1230 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1231 }
1232
1233 return 0;
1234
1235 error_out:
1236 scsi_disk_put(sdkp);
1237 return retval;
1238 }
1239
1240 /**
1241 * sd_release - invoked when the (last) close(2) is called on this
1242 * scsi disk.
1243 * @inode: only i_rdev member may be used
1244 * @filp: only f_mode and f_flags may be used
1245 *
1246 * Returns 0.
1247 *
1248 * Note: may block (uninterruptible) if error recovery is underway
1249 * on this disk.
1250 *
1251 * Locking: called with bdev->bd_mutex held.
1252 **/
1253 static void sd_release(struct gendisk *disk, fmode_t mode)
1254 {
1255 struct scsi_disk *sdkp = scsi_disk(disk);
1256 struct scsi_device *sdev = sdkp->device;
1257
1258 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1259
1260 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1261 if (scsi_block_when_processing_errors(sdev))
1262 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1263 }
1264
1265 /*
1266 * XXX and what if there are packets in flight and this close()
1267 * XXX is followed by a "rmmod sd_mod"?
1268 */
1269
1270 scsi_disk_put(sdkp);
1271 }
1272
1273 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1274 {
1275 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1276 struct scsi_device *sdp = sdkp->device;
1277 struct Scsi_Host *host = sdp->host;
1278 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1279 int diskinfo[4];
1280
1281 /* default to most commonly used values */
1282 diskinfo[0] = 0x40; /* 1 << 6 */
1283 diskinfo[1] = 0x20; /* 1 << 5 */
1284 diskinfo[2] = capacity >> 11;
1285
1286 /* override with calculated, extended default, or driver values */
1287 if (host->hostt->bios_param)
1288 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1289 else
1290 scsicam_bios_param(bdev, capacity, diskinfo);
1291
1292 geo->heads = diskinfo[0];
1293 geo->sectors = diskinfo[1];
1294 geo->cylinders = diskinfo[2];
1295 return 0;
1296 }
1297
1298 /**
1299 * sd_ioctl - process an ioctl
1300 * @inode: only i_rdev/i_bdev members may be used
1301 * @filp: only f_mode and f_flags may be used
1302 * @cmd: ioctl command number
1303 * @arg: this is third argument given to ioctl(2) system call.
1304 * Often contains a pointer.
1305 *
1306 * Returns 0 if successful (some ioctls return positive numbers on
1307 * success as well). Returns a negated errno value in case of error.
1308 *
1309 * Note: most ioctls are forward onto the block subsystem or further
1310 * down in the scsi subsystem.
1311 **/
1312 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1313 unsigned int cmd, unsigned long arg)
1314 {
1315 struct gendisk *disk = bdev->bd_disk;
1316 struct scsi_disk *sdkp = scsi_disk(disk);
1317 struct scsi_device *sdp = sdkp->device;
1318 void __user *p = (void __user *)arg;
1319 int error;
1320
1321 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1322 "cmd=0x%x\n", disk->disk_name, cmd));
1323
1324 error = scsi_verify_blk_ioctl(bdev, cmd);
1325 if (error < 0)
1326 return error;
1327
1328 /*
1329 * If we are in the middle of error recovery, don't let anyone
1330 * else try and use this device. Also, if error recovery fails, it
1331 * may try and take the device offline, in which case all further
1332 * access to the device is prohibited.
1333 */
1334 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1335 (mode & FMODE_NDELAY) != 0);
1336 if (error)
1337 goto out;
1338
1339 /*
1340 * Send SCSI addressing ioctls directly to mid level, send other
1341 * ioctls to block level and then onto mid level if they can't be
1342 * resolved.
1343 */
1344 switch (cmd) {
1345 case SCSI_IOCTL_GET_IDLUN:
1346 case SCSI_IOCTL_GET_BUS_NUMBER:
1347 error = scsi_ioctl(sdp, cmd, p);
1348 break;
1349 default:
1350 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1351 if (error != -ENOTTY)
1352 break;
1353 error = scsi_ioctl(sdp, cmd, p);
1354 break;
1355 }
1356 out:
1357 return error;
1358 }
1359
1360 static void set_media_not_present(struct scsi_disk *sdkp)
1361 {
1362 if (sdkp->media_present)
1363 sdkp->device->changed = 1;
1364
1365 if (sdkp->device->removable) {
1366 sdkp->media_present = 0;
1367 sdkp->capacity = 0;
1368 }
1369 }
1370
1371 static int media_not_present(struct scsi_disk *sdkp,
1372 struct scsi_sense_hdr *sshdr)
1373 {
1374 if (!scsi_sense_valid(sshdr))
1375 return 0;
1376
1377 /* not invoked for commands that could return deferred errors */
1378 switch (sshdr->sense_key) {
1379 case UNIT_ATTENTION:
1380 case NOT_READY:
1381 /* medium not present */
1382 if (sshdr->asc == 0x3A) {
1383 set_media_not_present(sdkp);
1384 return 1;
1385 }
1386 }
1387 return 0;
1388 }
1389
1390 /**
1391 * sd_check_events - check media events
1392 * @disk: kernel device descriptor
1393 * @clearing: disk events currently being cleared
1394 *
1395 * Returns mask of DISK_EVENT_*.
1396 *
1397 * Note: this function is invoked from the block subsystem.
1398 **/
1399 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1400 {
1401 struct scsi_disk *sdkp = scsi_disk_get(disk);
1402 struct scsi_device *sdp;
1403 struct scsi_sense_hdr *sshdr = NULL;
1404 int retval;
1405
1406 if (!sdkp)
1407 return 0;
1408
1409 sdp = sdkp->device;
1410 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1411
1412 /*
1413 * If the device is offline, don't send any commands - just pretend as
1414 * if the command failed. If the device ever comes back online, we
1415 * can deal with it then. It is only because of unrecoverable errors
1416 * that we would ever take a device offline in the first place.
1417 */
1418 if (!scsi_device_online(sdp)) {
1419 set_media_not_present(sdkp);
1420 goto out;
1421 }
1422
1423 /*
1424 * Using TEST_UNIT_READY enables differentiation between drive with
1425 * no cartridge loaded - NOT READY, drive with changed cartridge -
1426 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1427 *
1428 * Drives that auto spin down. eg iomega jaz 1G, will be started
1429 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1430 * sd_revalidate() is called.
1431 */
1432 retval = -ENODEV;
1433
1434 if (scsi_block_when_processing_errors(sdp)) {
1435 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1436 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1437 sshdr);
1438 }
1439
1440 /* failed to execute TUR, assume media not present */
1441 if (host_byte(retval)) {
1442 set_media_not_present(sdkp);
1443 goto out;
1444 }
1445
1446 if (media_not_present(sdkp, sshdr))
1447 goto out;
1448
1449 /*
1450 * For removable scsi disk we have to recognise the presence
1451 * of a disk in the drive.
1452 */
1453 if (!sdkp->media_present)
1454 sdp->changed = 1;
1455 sdkp->media_present = 1;
1456 out:
1457 /*
1458 * sdp->changed is set under the following conditions:
1459 *
1460 * Medium present state has changed in either direction.
1461 * Device has indicated UNIT_ATTENTION.
1462 */
1463 kfree(sshdr);
1464 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1465 sdp->changed = 0;
1466 scsi_disk_put(sdkp);
1467 return retval;
1468 }
1469
1470 static int sd_sync_cache(struct scsi_disk *sdkp)
1471 {
1472 int retries, res;
1473 struct scsi_device *sdp = sdkp->device;
1474 const int timeout = sdp->request_queue->rq_timeout
1475 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1476 struct scsi_sense_hdr sshdr;
1477
1478 if (!scsi_device_online(sdp))
1479 return -ENODEV;
1480
1481 for (retries = 3; retries > 0; --retries) {
1482 unsigned char cmd[10] = { 0 };
1483
1484 cmd[0] = SYNCHRONIZE_CACHE;
1485 /*
1486 * Leave the rest of the command zero to indicate
1487 * flush everything.
1488 */
1489 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1490 &sshdr, timeout, SD_MAX_RETRIES,
1491 NULL, REQ_PM);
1492 if (res == 0)
1493 break;
1494 }
1495
1496 if (res) {
1497 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1498
1499 if (driver_byte(res) & DRIVER_SENSE)
1500 sd_print_sense_hdr(sdkp, &sshdr);
1501 /* we need to evaluate the error return */
1502 if (scsi_sense_valid(&sshdr) &&
1503 (sshdr.asc == 0x3a || /* medium not present */
1504 sshdr.asc == 0x20)) /* invalid command */
1505 /* this is no error here */
1506 return 0;
1507
1508 switch (host_byte(res)) {
1509 /* ignore errors due to racing a disconnection */
1510 case DID_BAD_TARGET:
1511 case DID_NO_CONNECT:
1512 return 0;
1513 /* signal the upper layer it might try again */
1514 case DID_BUS_BUSY:
1515 case DID_IMM_RETRY:
1516 case DID_REQUEUE:
1517 case DID_SOFT_ERROR:
1518 return -EBUSY;
1519 default:
1520 return -EIO;
1521 }
1522 }
1523 return 0;
1524 }
1525
1526 static void sd_rescan(struct device *dev)
1527 {
1528 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1529
1530 revalidate_disk(sdkp->disk);
1531 }
1532
1533
1534 #ifdef CONFIG_COMPAT
1535 /*
1536 * This gets directly called from VFS. When the ioctl
1537 * is not recognized we go back to the other translation paths.
1538 */
1539 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1540 unsigned int cmd, unsigned long arg)
1541 {
1542 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1543 int error;
1544
1545 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1546 (mode & FMODE_NDELAY) != 0);
1547 if (error)
1548 return error;
1549
1550 /*
1551 * Let the static ioctl translation table take care of it.
1552 */
1553 if (!sdev->host->hostt->compat_ioctl)
1554 return -ENOIOCTLCMD;
1555 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1556 }
1557 #endif
1558
1559 static char sd_pr_type(enum pr_type type)
1560 {
1561 switch (type) {
1562 case PR_WRITE_EXCLUSIVE:
1563 return 0x01;
1564 case PR_EXCLUSIVE_ACCESS:
1565 return 0x03;
1566 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1567 return 0x05;
1568 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1569 return 0x06;
1570 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1571 return 0x07;
1572 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1573 return 0x08;
1574 default:
1575 return 0;
1576 }
1577 };
1578
1579 static int sd_pr_command(struct block_device *bdev, u8 sa,
1580 u64 key, u64 sa_key, u8 type, u8 flags)
1581 {
1582 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1583 struct scsi_sense_hdr sshdr;
1584 int result;
1585 u8 cmd[16] = { 0, };
1586 u8 data[24] = { 0, };
1587
1588 cmd[0] = PERSISTENT_RESERVE_OUT;
1589 cmd[1] = sa;
1590 cmd[2] = type;
1591 put_unaligned_be32(sizeof(data), &cmd[5]);
1592
1593 put_unaligned_be64(key, &data[0]);
1594 put_unaligned_be64(sa_key, &data[8]);
1595 data[20] = flags;
1596
1597 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1598 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1599
1600 if ((driver_byte(result) & DRIVER_SENSE) &&
1601 (scsi_sense_valid(&sshdr))) {
1602 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1603 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1604 }
1605
1606 return result;
1607 }
1608
1609 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1610 u32 flags)
1611 {
1612 if (flags & ~PR_FL_IGNORE_KEY)
1613 return -EOPNOTSUPP;
1614 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1615 old_key, new_key, 0,
1616 (1 << 0) /* APTPL */ |
1617 (1 << 2) /* ALL_TG_PT */);
1618 }
1619
1620 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1621 u32 flags)
1622 {
1623 if (flags)
1624 return -EOPNOTSUPP;
1625 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1626 }
1627
1628 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1629 {
1630 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1631 }
1632
1633 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1634 enum pr_type type, bool abort)
1635 {
1636 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1637 sd_pr_type(type), 0);
1638 }
1639
1640 static int sd_pr_clear(struct block_device *bdev, u64 key)
1641 {
1642 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1643 }
1644
1645 static const struct pr_ops sd_pr_ops = {
1646 .pr_register = sd_pr_register,
1647 .pr_reserve = sd_pr_reserve,
1648 .pr_release = sd_pr_release,
1649 .pr_preempt = sd_pr_preempt,
1650 .pr_clear = sd_pr_clear,
1651 };
1652
1653 static const struct block_device_operations sd_fops = {
1654 .owner = THIS_MODULE,
1655 .open = sd_open,
1656 .release = sd_release,
1657 .ioctl = sd_ioctl,
1658 .getgeo = sd_getgeo,
1659 #ifdef CONFIG_COMPAT
1660 .compat_ioctl = sd_compat_ioctl,
1661 #endif
1662 .check_events = sd_check_events,
1663 .revalidate_disk = sd_revalidate_disk,
1664 .unlock_native_capacity = sd_unlock_native_capacity,
1665 .pr_ops = &sd_pr_ops,
1666 };
1667
1668 /**
1669 * sd_eh_action - error handling callback
1670 * @scmd: sd-issued command that has failed
1671 * @eh_disp: The recovery disposition suggested by the midlayer
1672 *
1673 * This function is called by the SCSI midlayer upon completion of an
1674 * error test command (currently TEST UNIT READY). The result of sending
1675 * the eh command is passed in eh_disp. We're looking for devices that
1676 * fail medium access commands but are OK with non access commands like
1677 * test unit ready (so wrongly see the device as having a successful
1678 * recovery)
1679 **/
1680 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1681 {
1682 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1683
1684 if (!scsi_device_online(scmd->device) ||
1685 !scsi_medium_access_command(scmd) ||
1686 host_byte(scmd->result) != DID_TIME_OUT ||
1687 eh_disp != SUCCESS)
1688 return eh_disp;
1689
1690 /*
1691 * The device has timed out executing a medium access command.
1692 * However, the TEST UNIT READY command sent during error
1693 * handling completed successfully. Either the device is in the
1694 * process of recovering or has it suffered an internal failure
1695 * that prevents access to the storage medium.
1696 */
1697 sdkp->medium_access_timed_out++;
1698
1699 /*
1700 * If the device keeps failing read/write commands but TEST UNIT
1701 * READY always completes successfully we assume that medium
1702 * access is no longer possible and take the device offline.
1703 */
1704 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1705 scmd_printk(KERN_ERR, scmd,
1706 "Medium access timeout failure. Offlining disk!\n");
1707 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1708
1709 return FAILED;
1710 }
1711
1712 return eh_disp;
1713 }
1714
1715 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1716 {
1717 u64 start_lba = blk_rq_pos(scmd->request);
1718 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1719 u64 factor = scmd->device->sector_size / 512;
1720 u64 bad_lba;
1721 int info_valid;
1722 /*
1723 * resid is optional but mostly filled in. When it's unused,
1724 * its value is zero, so we assume the whole buffer transferred
1725 */
1726 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1727 unsigned int good_bytes;
1728
1729 if (scmd->request->cmd_type != REQ_TYPE_FS)
1730 return 0;
1731
1732 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1733 SCSI_SENSE_BUFFERSIZE,
1734 &bad_lba);
1735 if (!info_valid)
1736 return 0;
1737
1738 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1739 return 0;
1740
1741 /* be careful ... don't want any overflows */
1742 do_div(start_lba, factor);
1743 do_div(end_lba, factor);
1744
1745 /* The bad lba was reported incorrectly, we have no idea where
1746 * the error is.
1747 */
1748 if (bad_lba < start_lba || bad_lba >= end_lba)
1749 return 0;
1750
1751 /* This computation should always be done in terms of
1752 * the resolution of the device's medium.
1753 */
1754 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1755 return min(good_bytes, transferred);
1756 }
1757
1758 /**
1759 * sd_done - bottom half handler: called when the lower level
1760 * driver has completed (successfully or otherwise) a scsi command.
1761 * @SCpnt: mid-level's per command structure.
1762 *
1763 * Note: potentially run from within an ISR. Must not block.
1764 **/
1765 static int sd_done(struct scsi_cmnd *SCpnt)
1766 {
1767 int result = SCpnt->result;
1768 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1769 struct scsi_sense_hdr sshdr;
1770 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1771 struct request *req = SCpnt->request;
1772 int sense_valid = 0;
1773 int sense_deferred = 0;
1774 unsigned char op = SCpnt->cmnd[0];
1775 unsigned char unmap = SCpnt->cmnd[1] & 8;
1776
1777 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1778 if (!result) {
1779 good_bytes = blk_rq_bytes(req);
1780 scsi_set_resid(SCpnt, 0);
1781 } else {
1782 good_bytes = 0;
1783 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1784 }
1785 }
1786
1787 if (result) {
1788 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1789 if (sense_valid)
1790 sense_deferred = scsi_sense_is_deferred(&sshdr);
1791 }
1792 sdkp->medium_access_timed_out = 0;
1793
1794 if (driver_byte(result) != DRIVER_SENSE &&
1795 (!sense_valid || sense_deferred))
1796 goto out;
1797
1798 switch (sshdr.sense_key) {
1799 case HARDWARE_ERROR:
1800 case MEDIUM_ERROR:
1801 good_bytes = sd_completed_bytes(SCpnt);
1802 break;
1803 case RECOVERED_ERROR:
1804 good_bytes = scsi_bufflen(SCpnt);
1805 break;
1806 case NO_SENSE:
1807 /* This indicates a false check condition, so ignore it. An
1808 * unknown amount of data was transferred so treat it as an
1809 * error.
1810 */
1811 SCpnt->result = 0;
1812 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1813 break;
1814 case ABORTED_COMMAND:
1815 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1816 good_bytes = sd_completed_bytes(SCpnt);
1817 break;
1818 case ILLEGAL_REQUEST:
1819 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1820 good_bytes = sd_completed_bytes(SCpnt);
1821 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1822 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1823 switch (op) {
1824 case UNMAP:
1825 sd_config_discard(sdkp, SD_LBP_DISABLE);
1826 break;
1827 case WRITE_SAME_16:
1828 case WRITE_SAME:
1829 if (unmap)
1830 sd_config_discard(sdkp, SD_LBP_DISABLE);
1831 else {
1832 sdkp->device->no_write_same = 1;
1833 sd_config_write_same(sdkp);
1834
1835 good_bytes = 0;
1836 req->__data_len = blk_rq_bytes(req);
1837 req->cmd_flags |= REQ_QUIET;
1838 }
1839 }
1840 }
1841 break;
1842 default:
1843 break;
1844 }
1845 out:
1846 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1847 "sd_done: completed %d of %d bytes\n",
1848 good_bytes, scsi_bufflen(SCpnt)));
1849
1850 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1851 sd_dif_complete(SCpnt, good_bytes);
1852
1853 return good_bytes;
1854 }
1855
1856 /*
1857 * spinup disk - called only in sd_revalidate_disk()
1858 */
1859 static void
1860 sd_spinup_disk(struct scsi_disk *sdkp)
1861 {
1862 unsigned char cmd[10];
1863 unsigned long spintime_expire = 0;
1864 int retries, spintime;
1865 unsigned int the_result;
1866 struct scsi_sense_hdr sshdr;
1867 int sense_valid = 0;
1868
1869 spintime = 0;
1870
1871 /* Spin up drives, as required. Only do this at boot time */
1872 /* Spinup needs to be done for module loads too. */
1873 do {
1874 retries = 0;
1875
1876 do {
1877 cmd[0] = TEST_UNIT_READY;
1878 memset((void *) &cmd[1], 0, 9);
1879
1880 the_result = scsi_execute_req(sdkp->device, cmd,
1881 DMA_NONE, NULL, 0,
1882 &sshdr, SD_TIMEOUT,
1883 SD_MAX_RETRIES, NULL);
1884
1885 /*
1886 * If the drive has indicated to us that it
1887 * doesn't have any media in it, don't bother
1888 * with any more polling.
1889 */
1890 if (media_not_present(sdkp, &sshdr))
1891 return;
1892
1893 if (the_result)
1894 sense_valid = scsi_sense_valid(&sshdr);
1895 retries++;
1896 } while (retries < 3 &&
1897 (!scsi_status_is_good(the_result) ||
1898 ((driver_byte(the_result) & DRIVER_SENSE) &&
1899 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1900
1901 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1902 /* no sense, TUR either succeeded or failed
1903 * with a status error */
1904 if(!spintime && !scsi_status_is_good(the_result)) {
1905 sd_print_result(sdkp, "Test Unit Ready failed",
1906 the_result);
1907 }
1908 break;
1909 }
1910
1911 /*
1912 * The device does not want the automatic start to be issued.
1913 */
1914 if (sdkp->device->no_start_on_add)
1915 break;
1916
1917 if (sense_valid && sshdr.sense_key == NOT_READY) {
1918 if (sshdr.asc == 4 && sshdr.ascq == 3)
1919 break; /* manual intervention required */
1920 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1921 break; /* standby */
1922 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1923 break; /* unavailable */
1924 /*
1925 * Issue command to spin up drive when not ready
1926 */
1927 if (!spintime) {
1928 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1929 cmd[0] = START_STOP;
1930 cmd[1] = 1; /* Return immediately */
1931 memset((void *) &cmd[2], 0, 8);
1932 cmd[4] = 1; /* Start spin cycle */
1933 if (sdkp->device->start_stop_pwr_cond)
1934 cmd[4] |= 1 << 4;
1935 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1936 NULL, 0, &sshdr,
1937 SD_TIMEOUT, SD_MAX_RETRIES,
1938 NULL);
1939 spintime_expire = jiffies + 100 * HZ;
1940 spintime = 1;
1941 }
1942 /* Wait 1 second for next try */
1943 msleep(1000);
1944 printk(".");
1945
1946 /*
1947 * Wait for USB flash devices with slow firmware.
1948 * Yes, this sense key/ASC combination shouldn't
1949 * occur here. It's characteristic of these devices.
1950 */
1951 } else if (sense_valid &&
1952 sshdr.sense_key == UNIT_ATTENTION &&
1953 sshdr.asc == 0x28) {
1954 if (!spintime) {
1955 spintime_expire = jiffies + 5 * HZ;
1956 spintime = 1;
1957 }
1958 /* Wait 1 second for next try */
1959 msleep(1000);
1960 } else {
1961 /* we don't understand the sense code, so it's
1962 * probably pointless to loop */
1963 if(!spintime) {
1964 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1965 sd_print_sense_hdr(sdkp, &sshdr);
1966 }
1967 break;
1968 }
1969
1970 } while (spintime && time_before_eq(jiffies, spintime_expire));
1971
1972 if (spintime) {
1973 if (scsi_status_is_good(the_result))
1974 printk("ready\n");
1975 else
1976 printk("not responding...\n");
1977 }
1978 }
1979
1980
1981 /*
1982 * Determine whether disk supports Data Integrity Field.
1983 */
1984 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1985 {
1986 struct scsi_device *sdp = sdkp->device;
1987 u8 type;
1988 int ret = 0;
1989
1990 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1991 return ret;
1992
1993 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1994
1995 if (type > SD_DIF_TYPE3_PROTECTION)
1996 ret = -ENODEV;
1997 else if (scsi_host_dif_capable(sdp->host, type))
1998 ret = 1;
1999
2000 if (sdkp->first_scan || type != sdkp->protection_type)
2001 switch (ret) {
2002 case -ENODEV:
2003 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2004 " protection type %u. Disabling disk!\n",
2005 type);
2006 break;
2007 case 1:
2008 sd_printk(KERN_NOTICE, sdkp,
2009 "Enabling DIF Type %u protection\n", type);
2010 break;
2011 case 0:
2012 sd_printk(KERN_NOTICE, sdkp,
2013 "Disabling DIF Type %u protection\n", type);
2014 break;
2015 }
2016
2017 sdkp->protection_type = type;
2018
2019 return ret;
2020 }
2021
2022 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2023 struct scsi_sense_hdr *sshdr, int sense_valid,
2024 int the_result)
2025 {
2026 if (driver_byte(the_result) & DRIVER_SENSE)
2027 sd_print_sense_hdr(sdkp, sshdr);
2028 else
2029 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2030
2031 /*
2032 * Set dirty bit for removable devices if not ready -
2033 * sometimes drives will not report this properly.
2034 */
2035 if (sdp->removable &&
2036 sense_valid && sshdr->sense_key == NOT_READY)
2037 set_media_not_present(sdkp);
2038
2039 /*
2040 * We used to set media_present to 0 here to indicate no media
2041 * in the drive, but some drives fail read capacity even with
2042 * media present, so we can't do that.
2043 */
2044 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2045 }
2046
2047 #define RC16_LEN 32
2048 #if RC16_LEN > SD_BUF_SIZE
2049 #error RC16_LEN must not be more than SD_BUF_SIZE
2050 #endif
2051
2052 #define READ_CAPACITY_RETRIES_ON_RESET 10
2053
2054 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2055 unsigned char *buffer)
2056 {
2057 unsigned char cmd[16];
2058 struct scsi_sense_hdr sshdr;
2059 int sense_valid = 0;
2060 int the_result;
2061 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2062 unsigned int alignment;
2063 unsigned long long lba;
2064 unsigned sector_size;
2065
2066 if (sdp->no_read_capacity_16)
2067 return -EINVAL;
2068
2069 do {
2070 memset(cmd, 0, 16);
2071 cmd[0] = SERVICE_ACTION_IN_16;
2072 cmd[1] = SAI_READ_CAPACITY_16;
2073 cmd[13] = RC16_LEN;
2074 memset(buffer, 0, RC16_LEN);
2075
2076 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2077 buffer, RC16_LEN, &sshdr,
2078 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2079
2080 if (media_not_present(sdkp, &sshdr))
2081 return -ENODEV;
2082
2083 if (the_result) {
2084 sense_valid = scsi_sense_valid(&sshdr);
2085 if (sense_valid &&
2086 sshdr.sense_key == ILLEGAL_REQUEST &&
2087 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2088 sshdr.ascq == 0x00)
2089 /* Invalid Command Operation Code or
2090 * Invalid Field in CDB, just retry
2091 * silently with RC10 */
2092 return -EINVAL;
2093 if (sense_valid &&
2094 sshdr.sense_key == UNIT_ATTENTION &&
2095 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2096 /* Device reset might occur several times,
2097 * give it one more chance */
2098 if (--reset_retries > 0)
2099 continue;
2100 }
2101 retries--;
2102
2103 } while (the_result && retries);
2104
2105 if (the_result) {
2106 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2107 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2108 return -EINVAL;
2109 }
2110
2111 sector_size = get_unaligned_be32(&buffer[8]);
2112 lba = get_unaligned_be64(&buffer[0]);
2113
2114 if (sd_read_protection_type(sdkp, buffer) < 0) {
2115 sdkp->capacity = 0;
2116 return -ENODEV;
2117 }
2118
2119 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2120 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2121 "kernel compiled with support for large block "
2122 "devices.\n");
2123 sdkp->capacity = 0;
2124 return -EOVERFLOW;
2125 }
2126
2127 /* Logical blocks per physical block exponent */
2128 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2129
2130 /* Lowest aligned logical block */
2131 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2132 blk_queue_alignment_offset(sdp->request_queue, alignment);
2133 if (alignment && sdkp->first_scan)
2134 sd_printk(KERN_NOTICE, sdkp,
2135 "physical block alignment offset: %u\n", alignment);
2136
2137 if (buffer[14] & 0x80) { /* LBPME */
2138 sdkp->lbpme = 1;
2139
2140 if (buffer[14] & 0x40) /* LBPRZ */
2141 sdkp->lbprz = 1;
2142
2143 sd_config_discard(sdkp, SD_LBP_WS16);
2144 }
2145
2146 sdkp->capacity = lba + 1;
2147 return sector_size;
2148 }
2149
2150 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2151 unsigned char *buffer)
2152 {
2153 unsigned char cmd[16];
2154 struct scsi_sense_hdr sshdr;
2155 int sense_valid = 0;
2156 int the_result;
2157 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2158 sector_t lba;
2159 unsigned sector_size;
2160
2161 do {
2162 cmd[0] = READ_CAPACITY;
2163 memset(&cmd[1], 0, 9);
2164 memset(buffer, 0, 8);
2165
2166 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2167 buffer, 8, &sshdr,
2168 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2169
2170 if (media_not_present(sdkp, &sshdr))
2171 return -ENODEV;
2172
2173 if (the_result) {
2174 sense_valid = scsi_sense_valid(&sshdr);
2175 if (sense_valid &&
2176 sshdr.sense_key == UNIT_ATTENTION &&
2177 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2178 /* Device reset might occur several times,
2179 * give it one more chance */
2180 if (--reset_retries > 0)
2181 continue;
2182 }
2183 retries--;
2184
2185 } while (the_result && retries);
2186
2187 if (the_result) {
2188 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2189 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2190 return -EINVAL;
2191 }
2192
2193 sector_size = get_unaligned_be32(&buffer[4]);
2194 lba = get_unaligned_be32(&buffer[0]);
2195
2196 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2197 /* Some buggy (usb cardreader) devices return an lba of
2198 0xffffffff when the want to report a size of 0 (with
2199 which they really mean no media is present) */
2200 sdkp->capacity = 0;
2201 sdkp->physical_block_size = sector_size;
2202 return sector_size;
2203 }
2204
2205 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2206 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2207 "kernel compiled with support for large block "
2208 "devices.\n");
2209 sdkp->capacity = 0;
2210 return -EOVERFLOW;
2211 }
2212
2213 sdkp->capacity = lba + 1;
2214 sdkp->physical_block_size = sector_size;
2215 return sector_size;
2216 }
2217
2218 static int sd_try_rc16_first(struct scsi_device *sdp)
2219 {
2220 if (sdp->host->max_cmd_len < 16)
2221 return 0;
2222 if (sdp->try_rc_10_first)
2223 return 0;
2224 if (sdp->scsi_level > SCSI_SPC_2)
2225 return 1;
2226 if (scsi_device_protection(sdp))
2227 return 1;
2228 return 0;
2229 }
2230
2231 /*
2232 * read disk capacity
2233 */
2234 static void
2235 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2236 {
2237 int sector_size;
2238 struct scsi_device *sdp = sdkp->device;
2239 sector_t old_capacity = sdkp->capacity;
2240
2241 if (sd_try_rc16_first(sdp)) {
2242 sector_size = read_capacity_16(sdkp, sdp, buffer);
2243 if (sector_size == -EOVERFLOW)
2244 goto got_data;
2245 if (sector_size == -ENODEV)
2246 return;
2247 if (sector_size < 0)
2248 sector_size = read_capacity_10(sdkp, sdp, buffer);
2249 if (sector_size < 0)
2250 return;
2251 } else {
2252 sector_size = read_capacity_10(sdkp, sdp, buffer);
2253 if (sector_size == -EOVERFLOW)
2254 goto got_data;
2255 if (sector_size < 0)
2256 return;
2257 if ((sizeof(sdkp->capacity) > 4) &&
2258 (sdkp->capacity > 0xffffffffULL)) {
2259 int old_sector_size = sector_size;
2260 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2261 "Trying to use READ CAPACITY(16).\n");
2262 sector_size = read_capacity_16(sdkp, sdp, buffer);
2263 if (sector_size < 0) {
2264 sd_printk(KERN_NOTICE, sdkp,
2265 "Using 0xffffffff as device size\n");
2266 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2267 sector_size = old_sector_size;
2268 goto got_data;
2269 }
2270 }
2271 }
2272
2273 /* Some devices are known to return the total number of blocks,
2274 * not the highest block number. Some devices have versions
2275 * which do this and others which do not. Some devices we might
2276 * suspect of doing this but we don't know for certain.
2277 *
2278 * If we know the reported capacity is wrong, decrement it. If
2279 * we can only guess, then assume the number of blocks is even
2280 * (usually true but not always) and err on the side of lowering
2281 * the capacity.
2282 */
2283 if (sdp->fix_capacity ||
2284 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2285 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2286 "from its reported value: %llu\n",
2287 (unsigned long long) sdkp->capacity);
2288 --sdkp->capacity;
2289 }
2290
2291 got_data:
2292 if (sector_size == 0) {
2293 sector_size = 512;
2294 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2295 "assuming 512.\n");
2296 }
2297
2298 if (sector_size != 512 &&
2299 sector_size != 1024 &&
2300 sector_size != 2048 &&
2301 sector_size != 4096) {
2302 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2303 sector_size);
2304 /*
2305 * The user might want to re-format the drive with
2306 * a supported sectorsize. Once this happens, it
2307 * would be relatively trivial to set the thing up.
2308 * For this reason, we leave the thing in the table.
2309 */
2310 sdkp->capacity = 0;
2311 /*
2312 * set a bogus sector size so the normal read/write
2313 * logic in the block layer will eventually refuse any
2314 * request on this device without tripping over power
2315 * of two sector size assumptions
2316 */
2317 sector_size = 512;
2318 }
2319 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2320
2321 {
2322 char cap_str_2[10], cap_str_10[10];
2323
2324 string_get_size(sdkp->capacity, sector_size,
2325 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2326 string_get_size(sdkp->capacity, sector_size,
2327 STRING_UNITS_10, cap_str_10,
2328 sizeof(cap_str_10));
2329
2330 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2331 sd_printk(KERN_NOTICE, sdkp,
2332 "%llu %d-byte logical blocks: (%s/%s)\n",
2333 (unsigned long long)sdkp->capacity,
2334 sector_size, cap_str_10, cap_str_2);
2335
2336 if (sdkp->physical_block_size != sector_size)
2337 sd_printk(KERN_NOTICE, sdkp,
2338 "%u-byte physical blocks\n",
2339 sdkp->physical_block_size);
2340 }
2341 }
2342
2343 if (sdkp->capacity > 0xffffffff)
2344 sdp->use_16_for_rw = 1;
2345
2346 blk_queue_physical_block_size(sdp->request_queue,
2347 sdkp->physical_block_size);
2348 sdkp->device->sector_size = sector_size;
2349 }
2350
2351 /* called with buffer of length 512 */
2352 static inline int
2353 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2354 unsigned char *buffer, int len, struct scsi_mode_data *data,
2355 struct scsi_sense_hdr *sshdr)
2356 {
2357 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2358 SD_TIMEOUT, SD_MAX_RETRIES, data,
2359 sshdr);
2360 }
2361
2362 /*
2363 * read write protect setting, if possible - called only in sd_revalidate_disk()
2364 * called with buffer of length SD_BUF_SIZE
2365 */
2366 static void
2367 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2368 {
2369 int res;
2370 struct scsi_device *sdp = sdkp->device;
2371 struct scsi_mode_data data;
2372 int old_wp = sdkp->write_prot;
2373
2374 set_disk_ro(sdkp->disk, 0);
2375 if (sdp->skip_ms_page_3f) {
2376 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2377 return;
2378 }
2379
2380 if (sdp->use_192_bytes_for_3f) {
2381 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2382 } else {
2383 /*
2384 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2385 * We have to start carefully: some devices hang if we ask
2386 * for more than is available.
2387 */
2388 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2389
2390 /*
2391 * Second attempt: ask for page 0 When only page 0 is
2392 * implemented, a request for page 3F may return Sense Key
2393 * 5: Illegal Request, Sense Code 24: Invalid field in
2394 * CDB.
2395 */
2396 if (!scsi_status_is_good(res))
2397 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2398
2399 /*
2400 * Third attempt: ask 255 bytes, as we did earlier.
2401 */
2402 if (!scsi_status_is_good(res))
2403 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2404 &data, NULL);
2405 }
2406
2407 if (!scsi_status_is_good(res)) {
2408 sd_first_printk(KERN_WARNING, sdkp,
2409 "Test WP failed, assume Write Enabled\n");
2410 } else {
2411 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2412 set_disk_ro(sdkp->disk, sdkp->write_prot);
2413 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2414 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2415 sdkp->write_prot ? "on" : "off");
2416 sd_printk(KERN_DEBUG, sdkp,
2417 "Mode Sense: %02x %02x %02x %02x\n",
2418 buffer[0], buffer[1], buffer[2], buffer[3]);
2419 }
2420 }
2421 }
2422
2423 /*
2424 * sd_read_cache_type - called only from sd_revalidate_disk()
2425 * called with buffer of length SD_BUF_SIZE
2426 */
2427 static void
2428 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2429 {
2430 int len = 0, res;
2431 struct scsi_device *sdp = sdkp->device;
2432
2433 int dbd;
2434 int modepage;
2435 int first_len;
2436 struct scsi_mode_data data;
2437 struct scsi_sense_hdr sshdr;
2438 int old_wce = sdkp->WCE;
2439 int old_rcd = sdkp->RCD;
2440 int old_dpofua = sdkp->DPOFUA;
2441
2442
2443 if (sdkp->cache_override)
2444 return;
2445
2446 first_len = 4;
2447 if (sdp->skip_ms_page_8) {
2448 if (sdp->type == TYPE_RBC)
2449 goto defaults;
2450 else {
2451 if (sdp->skip_ms_page_3f)
2452 goto defaults;
2453 modepage = 0x3F;
2454 if (sdp->use_192_bytes_for_3f)
2455 first_len = 192;
2456 dbd = 0;
2457 }
2458 } else if (sdp->type == TYPE_RBC) {
2459 modepage = 6;
2460 dbd = 8;
2461 } else {
2462 modepage = 8;
2463 dbd = 0;
2464 }
2465
2466 /* cautiously ask */
2467 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2468 &data, &sshdr);
2469
2470 if (!scsi_status_is_good(res))
2471 goto bad_sense;
2472
2473 if (!data.header_length) {
2474 modepage = 6;
2475 first_len = 0;
2476 sd_first_printk(KERN_ERR, sdkp,
2477 "Missing header in MODE_SENSE response\n");
2478 }
2479
2480 /* that went OK, now ask for the proper length */
2481 len = data.length;
2482
2483 /*
2484 * We're only interested in the first three bytes, actually.
2485 * But the data cache page is defined for the first 20.
2486 */
2487 if (len < 3)
2488 goto bad_sense;
2489 else if (len > SD_BUF_SIZE) {
2490 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2491 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2492 len = SD_BUF_SIZE;
2493 }
2494 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2495 len = 192;
2496
2497 /* Get the data */
2498 if (len > first_len)
2499 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2500 &data, &sshdr);
2501
2502 if (scsi_status_is_good(res)) {
2503 int offset = data.header_length + data.block_descriptor_length;
2504
2505 while (offset < len) {
2506 u8 page_code = buffer[offset] & 0x3F;
2507 u8 spf = buffer[offset] & 0x40;
2508
2509 if (page_code == 8 || page_code == 6) {
2510 /* We're interested only in the first 3 bytes.
2511 */
2512 if (len - offset <= 2) {
2513 sd_first_printk(KERN_ERR, sdkp,
2514 "Incomplete mode parameter "
2515 "data\n");
2516 goto defaults;
2517 } else {
2518 modepage = page_code;
2519 goto Page_found;
2520 }
2521 } else {
2522 /* Go to the next page */
2523 if (spf && len - offset > 3)
2524 offset += 4 + (buffer[offset+2] << 8) +
2525 buffer[offset+3];
2526 else if (!spf && len - offset > 1)
2527 offset += 2 + buffer[offset+1];
2528 else {
2529 sd_first_printk(KERN_ERR, sdkp,
2530 "Incomplete mode "
2531 "parameter data\n");
2532 goto defaults;
2533 }
2534 }
2535 }
2536
2537 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2538 goto defaults;
2539
2540 Page_found:
2541 if (modepage == 8) {
2542 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2543 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2544 } else {
2545 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2546 sdkp->RCD = 0;
2547 }
2548
2549 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2550 if (sdp->broken_fua) {
2551 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2552 sdkp->DPOFUA = 0;
2553 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2554 sd_first_printk(KERN_NOTICE, sdkp,
2555 "Uses READ/WRITE(6), disabling FUA\n");
2556 sdkp->DPOFUA = 0;
2557 }
2558
2559 /* No cache flush allowed for write protected devices */
2560 if (sdkp->WCE && sdkp->write_prot)
2561 sdkp->WCE = 0;
2562
2563 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2564 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2565 sd_printk(KERN_NOTICE, sdkp,
2566 "Write cache: %s, read cache: %s, %s\n",
2567 sdkp->WCE ? "enabled" : "disabled",
2568 sdkp->RCD ? "disabled" : "enabled",
2569 sdkp->DPOFUA ? "supports DPO and FUA"
2570 : "doesn't support DPO or FUA");
2571
2572 return;
2573 }
2574
2575 bad_sense:
2576 if (scsi_sense_valid(&sshdr) &&
2577 sshdr.sense_key == ILLEGAL_REQUEST &&
2578 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2579 /* Invalid field in CDB */
2580 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2581 else
2582 sd_first_printk(KERN_ERR, sdkp,
2583 "Asking for cache data failed\n");
2584
2585 defaults:
2586 if (sdp->wce_default_on) {
2587 sd_first_printk(KERN_NOTICE, sdkp,
2588 "Assuming drive cache: write back\n");
2589 sdkp->WCE = 1;
2590 } else {
2591 sd_first_printk(KERN_ERR, sdkp,
2592 "Assuming drive cache: write through\n");
2593 sdkp->WCE = 0;
2594 }
2595 sdkp->RCD = 0;
2596 sdkp->DPOFUA = 0;
2597 }
2598
2599 /*
2600 * The ATO bit indicates whether the DIF application tag is available
2601 * for use by the operating system.
2602 */
2603 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2604 {
2605 int res, offset;
2606 struct scsi_device *sdp = sdkp->device;
2607 struct scsi_mode_data data;
2608 struct scsi_sense_hdr sshdr;
2609
2610 if (sdp->type != TYPE_DISK)
2611 return;
2612
2613 if (sdkp->protection_type == 0)
2614 return;
2615
2616 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2617 SD_MAX_RETRIES, &data, &sshdr);
2618
2619 if (!scsi_status_is_good(res) || !data.header_length ||
2620 data.length < 6) {
2621 sd_first_printk(KERN_WARNING, sdkp,
2622 "getting Control mode page failed, assume no ATO\n");
2623
2624 if (scsi_sense_valid(&sshdr))
2625 sd_print_sense_hdr(sdkp, &sshdr);
2626
2627 return;
2628 }
2629
2630 offset = data.header_length + data.block_descriptor_length;
2631
2632 if ((buffer[offset] & 0x3f) != 0x0a) {
2633 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2634 return;
2635 }
2636
2637 if ((buffer[offset + 5] & 0x80) == 0)
2638 return;
2639
2640 sdkp->ATO = 1;
2641
2642 return;
2643 }
2644
2645 /**
2646 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2647 * @disk: disk to query
2648 */
2649 static void sd_read_block_limits(struct scsi_disk *sdkp)
2650 {
2651 unsigned int sector_sz = sdkp->device->sector_size;
2652 const int vpd_len = 64;
2653 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2654
2655 if (!buffer ||
2656 /* Block Limits VPD */
2657 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2658 goto out;
2659
2660 blk_queue_io_min(sdkp->disk->queue,
2661 get_unaligned_be16(&buffer[6]) * sector_sz);
2662
2663 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2664 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2665
2666 if (buffer[3] == 0x3c) {
2667 unsigned int lba_count, desc_count;
2668
2669 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2670
2671 if (!sdkp->lbpme)
2672 goto out;
2673
2674 lba_count = get_unaligned_be32(&buffer[20]);
2675 desc_count = get_unaligned_be32(&buffer[24]);
2676
2677 if (lba_count && desc_count)
2678 sdkp->max_unmap_blocks = lba_count;
2679
2680 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2681
2682 if (buffer[32] & 0x80)
2683 sdkp->unmap_alignment =
2684 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2685
2686 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2687
2688 if (sdkp->max_unmap_blocks)
2689 sd_config_discard(sdkp, SD_LBP_UNMAP);
2690 else
2691 sd_config_discard(sdkp, SD_LBP_WS16);
2692
2693 } else { /* LBP VPD page tells us what to use */
2694 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2695 sd_config_discard(sdkp, SD_LBP_UNMAP);
2696 else if (sdkp->lbpws)
2697 sd_config_discard(sdkp, SD_LBP_WS16);
2698 else if (sdkp->lbpws10)
2699 sd_config_discard(sdkp, SD_LBP_WS10);
2700 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2701 sd_config_discard(sdkp, SD_LBP_UNMAP);
2702 else
2703 sd_config_discard(sdkp, SD_LBP_DISABLE);
2704 }
2705 }
2706
2707 out:
2708 kfree(buffer);
2709 }
2710
2711 /**
2712 * sd_read_block_characteristics - Query block dev. characteristics
2713 * @disk: disk to query
2714 */
2715 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2716 {
2717 unsigned char *buffer;
2718 u16 rot;
2719 const int vpd_len = 64;
2720
2721 buffer = kmalloc(vpd_len, GFP_KERNEL);
2722
2723 if (!buffer ||
2724 /* Block Device Characteristics VPD */
2725 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2726 goto out;
2727
2728 rot = get_unaligned_be16(&buffer[4]);
2729
2730 if (rot == 1) {
2731 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2732 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2733 }
2734
2735 out:
2736 kfree(buffer);
2737 }
2738
2739 /**
2740 * sd_read_block_provisioning - Query provisioning VPD page
2741 * @disk: disk to query
2742 */
2743 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2744 {
2745 unsigned char *buffer;
2746 const int vpd_len = 8;
2747
2748 if (sdkp->lbpme == 0)
2749 return;
2750
2751 buffer = kmalloc(vpd_len, GFP_KERNEL);
2752
2753 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2754 goto out;
2755
2756 sdkp->lbpvpd = 1;
2757 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2758 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2759 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2760
2761 out:
2762 kfree(buffer);
2763 }
2764
2765 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2766 {
2767 struct scsi_device *sdev = sdkp->device;
2768
2769 if (sdev->host->no_write_same) {
2770 sdev->no_write_same = 1;
2771
2772 return;
2773 }
2774
2775 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2776 /* too large values might cause issues with arcmsr */
2777 int vpd_buf_len = 64;
2778
2779 sdev->no_report_opcodes = 1;
2780
2781 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2782 * CODES is unsupported and the device has an ATA
2783 * Information VPD page (SAT).
2784 */
2785 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2786 sdev->no_write_same = 1;
2787 }
2788
2789 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2790 sdkp->ws16 = 1;
2791
2792 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2793 sdkp->ws10 = 1;
2794 }
2795
2796 /**
2797 * sd_revalidate_disk - called the first time a new disk is seen,
2798 * performs disk spin up, read_capacity, etc.
2799 * @disk: struct gendisk we care about
2800 **/
2801 static int sd_revalidate_disk(struct gendisk *disk)
2802 {
2803 struct scsi_disk *sdkp = scsi_disk(disk);
2804 struct scsi_device *sdp = sdkp->device;
2805 struct request_queue *q = sdkp->disk->queue;
2806 unsigned char *buffer;
2807 unsigned int dev_max, rw_max;
2808
2809 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2810 "sd_revalidate_disk\n"));
2811
2812 /*
2813 * If the device is offline, don't try and read capacity or any
2814 * of the other niceties.
2815 */
2816 if (!scsi_device_online(sdp))
2817 goto out;
2818
2819 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2820 if (!buffer) {
2821 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2822 "allocation failure.\n");
2823 goto out;
2824 }
2825
2826 sd_spinup_disk(sdkp);
2827
2828 /*
2829 * Without media there is no reason to ask; moreover, some devices
2830 * react badly if we do.
2831 */
2832 if (sdkp->media_present) {
2833 sd_read_capacity(sdkp, buffer);
2834
2835 if (scsi_device_supports_vpd(sdp)) {
2836 sd_read_block_provisioning(sdkp);
2837 sd_read_block_limits(sdkp);
2838 sd_read_block_characteristics(sdkp);
2839 }
2840
2841 sd_read_write_protect_flag(sdkp, buffer);
2842 sd_read_cache_type(sdkp, buffer);
2843 sd_read_app_tag_own(sdkp, buffer);
2844 sd_read_write_same(sdkp, buffer);
2845 }
2846
2847 sdkp->first_scan = 0;
2848
2849 /*
2850 * We now have all cache related info, determine how we deal
2851 * with flush requests.
2852 */
2853 sd_set_flush_flag(sdkp);
2854
2855 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2856 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2857
2858 /* Some devices report a maximum block count for READ/WRITE requests. */
2859 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2860 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2861
2862 /*
2863 * Use the device's preferred I/O size for reads and writes
2864 * unless the reported value is unreasonably small, large, or
2865 * garbage.
2866 */
2867 if (sdkp->opt_xfer_blocks &&
2868 sdkp->opt_xfer_blocks <= dev_max &&
2869 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
2870 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
2871 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2872 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2873 } else
2874 rw_max = BLK_DEF_MAX_SECTORS;
2875
2876 /* Combine with controller limits */
2877 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
2878
2879 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2880 sd_config_write_same(sdkp);
2881 kfree(buffer);
2882
2883 out:
2884 return 0;
2885 }
2886
2887 /**
2888 * sd_unlock_native_capacity - unlock native capacity
2889 * @disk: struct gendisk to set capacity for
2890 *
2891 * Block layer calls this function if it detects that partitions
2892 * on @disk reach beyond the end of the device. If the SCSI host
2893 * implements ->unlock_native_capacity() method, it's invoked to
2894 * give it a chance to adjust the device capacity.
2895 *
2896 * CONTEXT:
2897 * Defined by block layer. Might sleep.
2898 */
2899 static void sd_unlock_native_capacity(struct gendisk *disk)
2900 {
2901 struct scsi_device *sdev = scsi_disk(disk)->device;
2902
2903 if (sdev->host->hostt->unlock_native_capacity)
2904 sdev->host->hostt->unlock_native_capacity(sdev);
2905 }
2906
2907 /**
2908 * sd_format_disk_name - format disk name
2909 * @prefix: name prefix - ie. "sd" for SCSI disks
2910 * @index: index of the disk to format name for
2911 * @buf: output buffer
2912 * @buflen: length of the output buffer
2913 *
2914 * SCSI disk names starts at sda. The 26th device is sdz and the
2915 * 27th is sdaa. The last one for two lettered suffix is sdzz
2916 * which is followed by sdaaa.
2917 *
2918 * This is basically 26 base counting with one extra 'nil' entry
2919 * at the beginning from the second digit on and can be
2920 * determined using similar method as 26 base conversion with the
2921 * index shifted -1 after each digit is computed.
2922 *
2923 * CONTEXT:
2924 * Don't care.
2925 *
2926 * RETURNS:
2927 * 0 on success, -errno on failure.
2928 */
2929 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2930 {
2931 const int base = 'z' - 'a' + 1;
2932 char *begin = buf + strlen(prefix);
2933 char *end = buf + buflen;
2934 char *p;
2935 int unit;
2936
2937 p = end - 1;
2938 *p = '\0';
2939 unit = base;
2940 do {
2941 if (p == begin)
2942 return -EINVAL;
2943 *--p = 'a' + (index % unit);
2944 index = (index / unit) - 1;
2945 } while (index >= 0);
2946
2947 memmove(begin, p, end - p);
2948 memcpy(buf, prefix, strlen(prefix));
2949
2950 return 0;
2951 }
2952
2953 /*
2954 * The asynchronous part of sd_probe
2955 */
2956 static void sd_probe_async(void *data, async_cookie_t cookie)
2957 {
2958 struct scsi_disk *sdkp = data;
2959 struct scsi_device *sdp;
2960 struct gendisk *gd;
2961 u32 index;
2962 struct device *dev;
2963
2964 sdp = sdkp->device;
2965 gd = sdkp->disk;
2966 index = sdkp->index;
2967 dev = &sdp->sdev_gendev;
2968
2969 gd->major = sd_major((index & 0xf0) >> 4);
2970 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2971 gd->minors = SD_MINORS;
2972
2973 gd->fops = &sd_fops;
2974 gd->private_data = &sdkp->driver;
2975 gd->queue = sdkp->device->request_queue;
2976
2977 /* defaults, until the device tells us otherwise */
2978 sdp->sector_size = 512;
2979 sdkp->capacity = 0;
2980 sdkp->media_present = 1;
2981 sdkp->write_prot = 0;
2982 sdkp->cache_override = 0;
2983 sdkp->WCE = 0;
2984 sdkp->RCD = 0;
2985 sdkp->ATO = 0;
2986 sdkp->first_scan = 1;
2987 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2988
2989 sd_revalidate_disk(gd);
2990
2991 gd->driverfs_dev = &sdp->sdev_gendev;
2992 gd->flags = GENHD_FL_EXT_DEVT;
2993 if (sdp->removable) {
2994 gd->flags |= GENHD_FL_REMOVABLE;
2995 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2996 }
2997
2998 blk_pm_runtime_init(sdp->request_queue, dev);
2999 add_disk(gd);
3000 if (sdkp->capacity)
3001 sd_dif_config_host(sdkp);
3002
3003 sd_revalidate_disk(gd);
3004
3005 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3006 sdp->removable ? "removable " : "");
3007 scsi_autopm_put_device(sdp);
3008 put_device(&sdkp->dev);
3009 }
3010
3011 /**
3012 * sd_probe - called during driver initialization and whenever a
3013 * new scsi device is attached to the system. It is called once
3014 * for each scsi device (not just disks) present.
3015 * @dev: pointer to device object
3016 *
3017 * Returns 0 if successful (or not interested in this scsi device
3018 * (e.g. scanner)); 1 when there is an error.
3019 *
3020 * Note: this function is invoked from the scsi mid-level.
3021 * This function sets up the mapping between a given
3022 * <host,channel,id,lun> (found in sdp) and new device name
3023 * (e.g. /dev/sda). More precisely it is the block device major
3024 * and minor number that is chosen here.
3025 *
3026 * Assume sd_probe is not re-entrant (for time being)
3027 * Also think about sd_probe() and sd_remove() running coincidentally.
3028 **/
3029 static int sd_probe(struct device *dev)
3030 {
3031 struct scsi_device *sdp = to_scsi_device(dev);
3032 struct scsi_disk *sdkp;
3033 struct gendisk *gd;
3034 int index;
3035 int error;
3036
3037 scsi_autopm_get_device(sdp);
3038 error = -ENODEV;
3039 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
3040 goto out;
3041
3042 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3043 "sd_probe\n"));
3044
3045 error = -ENOMEM;
3046 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3047 if (!sdkp)
3048 goto out;
3049
3050 gd = alloc_disk(SD_MINORS);
3051 if (!gd)
3052 goto out_free;
3053
3054 do {
3055 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3056 goto out_put;
3057
3058 spin_lock(&sd_index_lock);
3059 error = ida_get_new(&sd_index_ida, &index);
3060 spin_unlock(&sd_index_lock);
3061 } while (error == -EAGAIN);
3062
3063 if (error) {
3064 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3065 goto out_put;
3066 }
3067
3068 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3069 if (error) {
3070 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3071 goto out_free_index;
3072 }
3073
3074 sdkp->device = sdp;
3075 sdkp->driver = &sd_template;
3076 sdkp->disk = gd;
3077 sdkp->index = index;
3078 atomic_set(&sdkp->openers, 0);
3079 atomic_set(&sdkp->device->ioerr_cnt, 0);
3080
3081 if (!sdp->request_queue->rq_timeout) {
3082 if (sdp->type != TYPE_MOD)
3083 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3084 else
3085 blk_queue_rq_timeout(sdp->request_queue,
3086 SD_MOD_TIMEOUT);
3087 }
3088
3089 device_initialize(&sdkp->dev);
3090 sdkp->dev.parent = dev;
3091 sdkp->dev.class = &sd_disk_class;
3092 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3093
3094 error = device_add(&sdkp->dev);
3095 if (error)
3096 goto out_free_index;
3097
3098 get_device(dev);
3099 dev_set_drvdata(dev, sdkp);
3100
3101 get_device(&sdkp->dev); /* prevent release before async_schedule */
3102 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3103
3104 return 0;
3105
3106 out_free_index:
3107 spin_lock(&sd_index_lock);
3108 ida_remove(&sd_index_ida, index);
3109 spin_unlock(&sd_index_lock);
3110 out_put:
3111 put_disk(gd);
3112 out_free:
3113 kfree(sdkp);
3114 out:
3115 scsi_autopm_put_device(sdp);
3116 return error;
3117 }
3118
3119 /**
3120 * sd_remove - called whenever a scsi disk (previously recognized by
3121 * sd_probe) is detached from the system. It is called (potentially
3122 * multiple times) during sd module unload.
3123 * @sdp: pointer to mid level scsi device object
3124 *
3125 * Note: this function is invoked from the scsi mid-level.
3126 * This function potentially frees up a device name (e.g. /dev/sdc)
3127 * that could be re-used by a subsequent sd_probe().
3128 * This function is not called when the built-in sd driver is "exit-ed".
3129 **/
3130 static int sd_remove(struct device *dev)
3131 {
3132 struct scsi_disk *sdkp;
3133 dev_t devt;
3134
3135 sdkp = dev_get_drvdata(dev);
3136 devt = disk_devt(sdkp->disk);
3137 scsi_autopm_get_device(sdkp->device);
3138
3139 async_synchronize_full_domain(&scsi_sd_pm_domain);
3140 async_synchronize_full_domain(&scsi_sd_probe_domain);
3141 device_del(&sdkp->dev);
3142 del_gendisk(sdkp->disk);
3143 sd_shutdown(dev);
3144
3145 blk_register_region(devt, SD_MINORS, NULL,
3146 sd_default_probe, NULL, NULL);
3147
3148 mutex_lock(&sd_ref_mutex);
3149 dev_set_drvdata(dev, NULL);
3150 put_device(&sdkp->dev);
3151 mutex_unlock(&sd_ref_mutex);
3152
3153 return 0;
3154 }
3155
3156 /**
3157 * scsi_disk_release - Called to free the scsi_disk structure
3158 * @dev: pointer to embedded class device
3159 *
3160 * sd_ref_mutex must be held entering this routine. Because it is
3161 * called on last put, you should always use the scsi_disk_get()
3162 * scsi_disk_put() helpers which manipulate the semaphore directly
3163 * and never do a direct put_device.
3164 **/
3165 static void scsi_disk_release(struct device *dev)
3166 {
3167 struct scsi_disk *sdkp = to_scsi_disk(dev);
3168 struct gendisk *disk = sdkp->disk;
3169
3170 spin_lock(&sd_index_lock);
3171 ida_remove(&sd_index_ida, sdkp->index);
3172 spin_unlock(&sd_index_lock);
3173
3174 disk->private_data = NULL;
3175 put_disk(disk);
3176 put_device(&sdkp->device->sdev_gendev);
3177
3178 kfree(sdkp);
3179 }
3180
3181 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3182 {
3183 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3184 struct scsi_sense_hdr sshdr;
3185 struct scsi_device *sdp = sdkp->device;
3186 int res;
3187
3188 if (start)
3189 cmd[4] |= 1; /* START */
3190
3191 if (sdp->start_stop_pwr_cond)
3192 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3193
3194 if (!scsi_device_online(sdp))
3195 return -ENODEV;
3196
3197 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3198 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3199 if (res) {
3200 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3201 if (driver_byte(res) & DRIVER_SENSE)
3202 sd_print_sense_hdr(sdkp, &sshdr);
3203 if (scsi_sense_valid(&sshdr) &&
3204 /* 0x3a is medium not present */
3205 sshdr.asc == 0x3a)
3206 res = 0;
3207 }
3208
3209 /* SCSI error codes must not go to the generic layer */
3210 if (res)
3211 return -EIO;
3212
3213 return 0;
3214 }
3215
3216 /*
3217 * Send a SYNCHRONIZE CACHE instruction down to the device through
3218 * the normal SCSI command structure. Wait for the command to
3219 * complete.
3220 */
3221 static void sd_shutdown(struct device *dev)
3222 {
3223 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3224
3225 if (!sdkp)
3226 return; /* this can happen */
3227
3228 if (pm_runtime_suspended(dev))
3229 return;
3230
3231 if (sdkp->WCE && sdkp->media_present) {
3232 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3233 sd_sync_cache(sdkp);
3234 }
3235
3236 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3237 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3238 sd_start_stop_device(sdkp, 0);
3239 }
3240 }
3241
3242 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3243 {
3244 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3245 int ret = 0;
3246
3247 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3248 return 0;
3249
3250 if (sdkp->WCE && sdkp->media_present) {
3251 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3252 ret = sd_sync_cache(sdkp);
3253 if (ret) {
3254 /* ignore OFFLINE device */
3255 if (ret == -ENODEV)
3256 ret = 0;
3257 goto done;
3258 }
3259 }
3260
3261 if (sdkp->device->manage_start_stop) {
3262 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3263 /* an error is not worth aborting a system sleep */
3264 ret = sd_start_stop_device(sdkp, 0);
3265 if (ignore_stop_errors)
3266 ret = 0;
3267 }
3268
3269 done:
3270 return ret;
3271 }
3272
3273 static int sd_suspend_system(struct device *dev)
3274 {
3275 return sd_suspend_common(dev, true);
3276 }
3277
3278 static int sd_suspend_runtime(struct device *dev)
3279 {
3280 return sd_suspend_common(dev, false);
3281 }
3282
3283 static int sd_resume(struct device *dev)
3284 {
3285 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3286
3287 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3288 return 0;
3289
3290 if (!sdkp->device->manage_start_stop)
3291 return 0;
3292
3293 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3294 return sd_start_stop_device(sdkp, 1);
3295 }
3296
3297 /**
3298 * init_sd - entry point for this driver (both when built in or when
3299 * a module).
3300 *
3301 * Note: this function registers this driver with the scsi mid-level.
3302 **/
3303 static int __init init_sd(void)
3304 {
3305 int majors = 0, i, err;
3306
3307 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3308
3309 for (i = 0; i < SD_MAJORS; i++) {
3310 if (register_blkdev(sd_major(i), "sd") != 0)
3311 continue;
3312 majors++;
3313 blk_register_region(sd_major(i), SD_MINORS, NULL,
3314 sd_default_probe, NULL, NULL);
3315 }
3316
3317 if (!majors)
3318 return -ENODEV;
3319
3320 err = class_register(&sd_disk_class);
3321 if (err)
3322 goto err_out;
3323
3324 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3325 0, 0, NULL);
3326 if (!sd_cdb_cache) {
3327 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3328 err = -ENOMEM;
3329 goto err_out_class;
3330 }
3331
3332 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3333 if (!sd_cdb_pool) {
3334 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3335 err = -ENOMEM;
3336 goto err_out_cache;
3337 }
3338
3339 err = scsi_register_driver(&sd_template.gendrv);
3340 if (err)
3341 goto err_out_driver;
3342
3343 return 0;
3344
3345 err_out_driver:
3346 mempool_destroy(sd_cdb_pool);
3347
3348 err_out_cache:
3349 kmem_cache_destroy(sd_cdb_cache);
3350
3351 err_out_class:
3352 class_unregister(&sd_disk_class);
3353 err_out:
3354 for (i = 0; i < SD_MAJORS; i++)
3355 unregister_blkdev(sd_major(i), "sd");
3356 return err;
3357 }
3358
3359 /**
3360 * exit_sd - exit point for this driver (when it is a module).
3361 *
3362 * Note: this function unregisters this driver from the scsi mid-level.
3363 **/
3364 static void __exit exit_sd(void)
3365 {
3366 int i;
3367
3368 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3369
3370 scsi_unregister_driver(&sd_template.gendrv);
3371 mempool_destroy(sd_cdb_pool);
3372 kmem_cache_destroy(sd_cdb_cache);
3373
3374 class_unregister(&sd_disk_class);
3375
3376 for (i = 0; i < SD_MAJORS; i++) {
3377 blk_unregister_region(sd_major(i), SD_MINORS);
3378 unregister_blkdev(sd_major(i), "sd");
3379 }
3380 }
3381
3382 module_init(init_sd);
3383 module_exit(exit_sd);
3384
3385 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3386 struct scsi_sense_hdr *sshdr)
3387 {
3388 scsi_print_sense_hdr(sdkp->device,
3389 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3390 }
3391
3392 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3393 int result)
3394 {
3395 const char *hb_string = scsi_hostbyte_string(result);
3396 const char *db_string = scsi_driverbyte_string(result);
3397
3398 if (hb_string || db_string)
3399 sd_printk(KERN_INFO, sdkp,
3400 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3401 hb_string ? hb_string : "invalid",
3402 db_string ? db_string : "invalid");
3403 else
3404 sd_printk(KERN_INFO, sdkp,
3405 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3406 msg, host_byte(result), driver_byte(result));
3407 }
3408
Linux with added FPC-III support