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[SCSI] qla2xxx: remove unnecessary reads of PCI_CAP_ID_EXP
[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / sd.c
CommitLineData
1da177e4
LT		 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
1da177e4
LT		 35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
1da177e4
LT		 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>
1da177e4 48#include <linux/delay.h>
0b950672 49#include <linux/mutex.h>
7404ad3b 50#include <linux/string_helpers.h>
4ace92fc 51#include <linux/async.h>
5a0e3ad6 52#include <linux/slab.h>
54f57588 53#include <linux/pm_runtime.h>
1da177e4 54#include <asm/uaccess.h>
8f76d151 55#include <asm/unaligned.h>
1da177e4
LT		 56
57#include <scsi/scsi.h>
58#include <scsi/scsi_cmnd.h>
59#include <scsi/scsi_dbg.h>
60#include <scsi/scsi_device.h>
61#include <scsi/scsi_driver.h>
62#include <scsi/scsi_eh.h>
63#include <scsi/scsi_host.h>
64#include <scsi/scsi_ioctl.h>
1da177e4
LT		 65#include <scsi/scsicam.h>
66
aa91696e 67#include "sd.h"
a7a20d10 68#include "scsi_priv.h"
1da177e4
LT		 69#include "scsi_logging.h"
70
f018fa55
RH		 71MODULE_AUTHOR("Eric Youngdale");
72MODULE_DESCRIPTION("SCSI disk (sd) driver");
73MODULE_LICENSE("GPL");
74
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
d7b8bcb0
MT		 91MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
f018fa55 94
870d6656 95#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
f615b48c 96#define SD_MINORS 16
870d6656 97#else
3e1a7ff8 98#define SD_MINORS 0
870d6656
TH		 99#endif
100
c98a0eb0 101static void sd_config_discard(struct scsi_disk *, unsigned int);
7b3d9545 102static int sd_revalidate_disk(struct gendisk *);
72ec24bd 103static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 104static int sd_probe(struct device *);
105static int sd_remove(struct device *);
106static void sd_shutdown(struct device *);
107static int sd_suspend(struct device *, pm_message_t state);
108static int sd_resume(struct device *);
109static void sd_rescan(struct device *);
110static int sd_done(struct scsi_cmnd *);
18a4d0a2 111static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
7b3d9545 112static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 113static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 114static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
115static void sd_print_result(struct scsi_disk *, int);
116
4034cc68 117static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 118static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 119
120/* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
0b950672 123static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 124
439d77f7
HS		 125static struct kmem_cache *sd_cdb_cache;
126static mempool_t *sd_cdb_pool;
4e7392ec 127
6bdaa1f1
JB		 128static const char *sd_cache_types[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
131};
132
ee959b00
TJ		 133static ssize_t
134sd_store_cache_type(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
6bdaa1f1
JB		 136{
137 int i, ct = -1, rcd, wce, sp;
ee959b00 138 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 139 struct scsi_device *sdp = sdkp->device;
140 char buffer[64];
141 char *buffer_data;
142 struct scsi_mode_data data;
143 struct scsi_sense_hdr sshdr;
144 int len;
145
146 if (sdp->type != TYPE_DISK)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
150 return -EINVAL;
151
6391a113 152 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 153 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 154 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
155 buf[len] == '\n') {
156 ct = i;
157 break;
158 }
159 }
160 if (ct < 0)
161 return -EINVAL;
162 rcd = ct & 0x01 ? 1 : 0;
163 wce = ct & 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
165 SD_MAX_RETRIES, &data, NULL))
166 return -EINVAL;
a9312fb8 167 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 168 data.block_descriptor_length);
169 buffer_data = buffer + data.header_length +
170 data.block_descriptor_length;
171 buffer_data[2] &= ~0x05;
172 buffer_data[2] |= wce << 2 | rcd;
173 sp = buffer_data[0] & 0x80 ? 1 : 0;
174
175 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
176 SD_MAX_RETRIES, &data, &sshdr)) {
177 if (scsi_sense_valid(&sshdr))
e73aec82 178 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 179 return -EINVAL;
180 }
f98a8cae 181 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 182 return count;
183}
184
ee959b00
TJ		 185static ssize_t
186sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
c3c94c5a 188{
ee959b00 189 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 190 struct scsi_device *sdp = sdkp->device;
191
192 if (!capable(CAP_SYS_ADMIN))
193 return -EACCES;
194
195 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
196
197 return count;
198}
199
ee959b00
TJ		 200static ssize_t
201sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
a144c5ae 203{
ee959b00 204 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 205 struct scsi_device *sdp = sdkp->device;
206
207 if (!capable(CAP_SYS_ADMIN))
208 return -EACCES;
209
210 if (sdp->type != TYPE_DISK)
211 return -EINVAL;
212
213 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
214
215 return count;
216}
217
ee959b00
TJ		 218static ssize_t
219sd_show_cache_type(struct device *dev, struct device_attribute *attr,
220 char *buf)
6bdaa1f1 221{
ee959b00 222 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 223 int ct = sdkp->RCD + 2*sdkp->WCE;
224
225 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226}
227
ee959b00
TJ		 228static ssize_t
229sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 230{
ee959b00 231 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 232
233 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234}
235
ee959b00
TJ		 236static ssize_t
237sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
238 char *buf)
c3c94c5a 239{
ee959b00 240 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 241 struct scsi_device *sdp = sdkp->device;
242
243 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244}
245
ee959b00
TJ		 246static ssize_t
247sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
248 char *buf)
a144c5ae 249{
ee959b00 250 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 251
252 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253}
254
e0597d70
MP		 255static ssize_t
256sd_show_protection_type(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262}
263
518fa8e3
MP		 264static ssize_t
265sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
266 char *buf)
267{
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 struct scsi_device *sdp = sdkp->device;
270 unsigned int dif, dix;
271
272 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
273 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
274
275 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
276 dif = 0;
277 dix = 1;
278 }
279
280 if (!dif && !dix)
281 return snprintf(buf, 20, "none\n");
282
283 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
284}
285
e0597d70
MP		 286static ssize_t
287sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
288 char *buf)
289{
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
291
292 return snprintf(buf, 20, "%u\n", sdkp->ATO);
293}
294
e339c1a7
MP		 295static ssize_t
296sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
297 char *buf)
298{
299 struct scsi_disk *sdkp = to_scsi_disk(dev);
300
c98a0eb0
MP		 301 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
302}
303
304static const char *lbp_mode[] = {
305 [SD_LBP_FULL] = "full",
306 [SD_LBP_UNMAP] = "unmap",
307 [SD_LBP_WS16] = "writesame_16",
308 [SD_LBP_WS10] = "writesame_10",
309 [SD_LBP_ZERO] = "writesame_zero",
310 [SD_LBP_DISABLE] = "disabled",
311};
312
313static ssize_t
314sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
315 char *buf)
316{
317 struct scsi_disk *sdkp = to_scsi_disk(dev);
318
319 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
320}
321
322static ssize_t
323sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
324 const char *buf, size_t count)
325{
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
328
329 if (!capable(CAP_SYS_ADMIN))
330 return -EACCES;
331
332 if (sdp->type != TYPE_DISK)
333 return -EINVAL;
334
335 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
336 sd_config_discard(sdkp, SD_LBP_UNMAP);
337 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
338 sd_config_discard(sdkp, SD_LBP_WS16);
339 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
340 sd_config_discard(sdkp, SD_LBP_WS10);
341 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
342 sd_config_discard(sdkp, SD_LBP_ZERO);
343 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
344 sd_config_discard(sdkp, SD_LBP_DISABLE);
345 else
346 return -EINVAL;
347
348 return count;
e339c1a7
MP		 349}
350
18a4d0a2
MP		 351static ssize_t
352sd_show_max_medium_access_timeouts(struct device *dev,
353 struct device_attribute *attr, char *buf)
354{
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
358}
359
360static ssize_t
361sd_store_max_medium_access_timeouts(struct device *dev,
362 struct device_attribute *attr,
363 const char *buf, size_t count)
364{
365 struct scsi_disk *sdkp = to_scsi_disk(dev);
366 int err;
367
368 if (!capable(CAP_SYS_ADMIN))
369 return -EACCES;
370
371 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
372
373 return err ? err : count;
374}
375
ee959b00 376static struct device_attribute sd_disk_attrs[] = {
6bdaa1f1
JB		 377 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
378 sd_store_cache_type),
379 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
a144c5ae
BK		 380 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
381 sd_store_allow_restart),
c3c94c5a
TH		 382 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
383 sd_store_manage_start_stop),
e0597d70 384 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
518fa8e3 385 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
e0597d70 386 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
e339c1a7 387 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
c98a0eb0
MP		 388 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
389 sd_store_provisioning_mode),
18a4d0a2
MP		 390 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
391 sd_show_max_medium_access_timeouts,
392 sd_store_max_medium_access_timeouts),
6bdaa1f1
JB		 393 __ATTR_NULL,
394};
395
396static struct class sd_disk_class = {
397 .name = "scsi_disk",
398 .owner = THIS_MODULE,
ee959b00
TJ		 399 .dev_release = scsi_disk_release,
400 .dev_attrs = sd_disk_attrs,
6bdaa1f1 401};
1da177e4
LT		 402
403static struct scsi_driver sd_template = {
404 .owner = THIS_MODULE,
405 .gendrv = {
406 .name = "sd",
407 .probe = sd_probe,
408 .remove = sd_remove,
c3c94c5a
TH		 409 .suspend = sd_suspend,
410 .resume = sd_resume,
1da177e4
LT		 411 .shutdown = sd_shutdown,
412 },
413 .rescan = sd_rescan,
7b3d9545 414 .done = sd_done,
18a4d0a2 415 .eh_action = sd_eh_action,
1da177e4
LT		 416};
417
418/*
419 * Device no to disk mapping:
420 *
421 * major disc2 disc p1
422 * |............|.............|....|....| <- dev_t
423 * 31 20 19 8 7 4 3 0
424 *
425 * Inside a major, we have 16k disks, however mapped non-
426 * contiguously. The first 16 disks are for major0, the next
427 * ones with major1, ... Disk 256 is for major0 again, disk 272
428 * for major1, ...
429 * As we stay compatible with our numbering scheme, we can reuse
430 * the well-know SCSI majors 8, 65--71, 136--143.
431 */
432static int sd_major(int major_idx)
433{
434 switch (major_idx) {
435 case 0:
436 return SCSI_DISK0_MAJOR;
437 case 1 ... 7:
438 return SCSI_DISK1_MAJOR + major_idx - 1;
439 case 8 ... 15:
440 return SCSI_DISK8_MAJOR + major_idx - 8;
441 default:
442 BUG();
443 return 0; /* shut up gcc */
444 }
445}
446
39b7f1e2 447static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 448{
449 struct scsi_disk *sdkp = NULL;
450
39b7f1e2
AS		 451 if (disk->private_data) {
452 sdkp = scsi_disk(disk);
453 if (scsi_device_get(sdkp->device) == 0)
ee959b00 454 get_device(&sdkp->dev);
39b7f1e2
AS		 455 else
456 sdkp = NULL;
457 }
458 return sdkp;
459}
460
461static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
462{
463 struct scsi_disk *sdkp;
464
0b950672 465 mutex_lock(&sd_ref_mutex);
39b7f1e2 466 sdkp = __scsi_disk_get(disk);
0b950672 467 mutex_unlock(&sd_ref_mutex);
1da177e4 468 return sdkp;
39b7f1e2 469}
1da177e4 470
39b7f1e2
AS		 471static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
472{
473 struct scsi_disk *sdkp;
474
0b950672 475 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 476 sdkp = dev_get_drvdata(dev);
477 if (sdkp)
478 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 479 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 480 return sdkp;
481}
482
483static void scsi_disk_put(struct scsi_disk *sdkp)
484{
485 struct scsi_device *sdev = sdkp->device;
486
0b950672 487 mutex_lock(&sd_ref_mutex);
ee959b00 488 put_device(&sdkp->dev);
1da177e4 489 scsi_device_put(sdev);
0b950672 490 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 491}
492
35e1a5d9
MP		 493static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
494{
495 unsigned int prot_op = SCSI_PROT_NORMAL;
496 unsigned int dix = scsi_prot_sg_count(scmd);
497
498 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
499 if (dif && dix)
500 prot_op = SCSI_PROT_READ_PASS;
501 else if (dif && !dix)
502 prot_op = SCSI_PROT_READ_STRIP;
503 else if (!dif && dix)
504 prot_op = SCSI_PROT_READ_INSERT;
505 } else {
506 if (dif && dix)
507 prot_op = SCSI_PROT_WRITE_PASS;
508 else if (dif && !dix)
509 prot_op = SCSI_PROT_WRITE_INSERT;
510 else if (!dif && dix)
511 prot_op = SCSI_PROT_WRITE_STRIP;
512 }
513
514 scsi_set_prot_op(scmd, prot_op);
515 scsi_set_prot_type(scmd, dif);
516}
517
c98a0eb0
MP		 518static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
519{
520 struct request_queue *q = sdkp->disk->queue;
521 unsigned int logical_block_size = sdkp->device->sector_size;
522 unsigned int max_blocks = 0;
523
524 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 525 q->limits.discard_alignment = sdkp->unmap_alignment *
526 logical_block_size;
c98a0eb0
MP		 527 q->limits.discard_granularity =
528 max(sdkp->physical_block_size,
529 sdkp->unmap_granularity * logical_block_size);
530
89730393
MP		 531 sdkp->provisioning_mode = mode;
532
c98a0eb0
MP		 533 switch (mode) {
534
535 case SD_LBP_DISABLE:
536 q->limits.max_discard_sectors = 0;
537 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
538 return;
539
540 case SD_LBP_UNMAP:
541 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
542 break;
543
544 case SD_LBP_WS16:
545 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
546 break;
547
548 case SD_LBP_WS10:
549 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
550 break;
551
552 case SD_LBP_ZERO:
553 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
554 q->limits.discard_zeroes_data = 1;
555 break;
556 }
557
558 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
559 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 560}
561
e339c1a7 562/**
66ac0280
CH		 563 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
564 * @sdp: scsi device to operate one
e339c1a7
MP		 565 * @rq: Request to prepare
566 *
567 * Will issue either UNMAP or WRITE SAME(16) depending on preference
568 * indicated by target device.
569 **/
66ac0280 570static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 571{
572 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
573 struct bio *bio = rq->bio;
574 sector_t sector = bio->bi_sector;
66ac0280
CH		 575 unsigned int nr_sectors = bio_sectors(bio);
576 unsigned int len;
f1126e95 577 int ret;
c98a0eb0 578 char *buf;
66ac0280 579 struct page *page;
e339c1a7
MP		 580
581 if (sdkp->device->sector_size == 4096) {
582 sector >>= 3;
66ac0280 583 nr_sectors >>= 3;
e339c1a7
MP		 584 }
585
e339c1a7
MP		 586 rq->timeout = SD_TIMEOUT;
587
588 memset(rq->cmd, 0, rq->cmd_len);
589
66ac0280
CH		 590 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
591 if (!page)
592 return BLKPREP_DEFER;
593
c98a0eb0
MP		 594 switch (sdkp->provisioning_mode) {
595 case SD_LBP_UNMAP:
596 buf = page_address(page);
e339c1a7 597
66ac0280 598 rq->cmd_len = 10;
e339c1a7
MP		 599 rq->cmd[0] = UNMAP;
600 rq->cmd[8] = 24;
e339c1a7
MP		 601
602 put_unaligned_be16(6 + 16, &buf[0]);
603 put_unaligned_be16(16, &buf[2]);
604 put_unaligned_be64(sector, &buf[8]);
66ac0280 605 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 606
66ac0280 607 len = 24;
c98a0eb0
MP		 608 break;
609
610 case SD_LBP_WS16:
66ac0280 611 rq->cmd_len = 16;
e339c1a7
MP		 612 rq->cmd[0] = WRITE_SAME_16;
613 rq->cmd[1] = 0x8; /* UNMAP */
614 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 615 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
616
617 len = sdkp->device->sector_size;
c98a0eb0
MP		 618 break;
619
620 case SD_LBP_WS10:
621 case SD_LBP_ZERO:
622 rq->cmd_len = 10;
623 rq->cmd[0] = WRITE_SAME;
624 if (sdkp->provisioning_mode == SD_LBP_WS10)
625 rq->cmd[1] = 0x8; /* UNMAP */
626 put_unaligned_be32(sector, &rq->cmd[2]);
627 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
628
629 len = sdkp->device->sector_size;
630 break;
631
632 default:
09b9cc44 633 ret = BLKPREP_KILL;
c98a0eb0 634 goto out;
e339c1a7
MP		 635 }
636
66ac0280 637 blk_add_request_payload(rq, page, len);
f1126e95
FT		 638 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
639 rq->buffer = page_address(page);
c98a0eb0
MP		 640
641out:
610a6349
FT		 642 if (ret != BLKPREP_OK) {
643 __free_page(page);
644 rq->buffer = NULL;
645 }
f1126e95
FT		 646 return ret;
647}
648
90467c29
FT		 649static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
650{
e3b3e624 651 rq->timeout = SD_FLUSH_TIMEOUT;
90467c29
FT		 652 rq->retries = SD_MAX_RETRIES;
653 rq->cmd[0] = SYNCHRONIZE_CACHE;
654 rq->cmd_len = 10;
655
656 return scsi_setup_blk_pc_cmnd(sdp, rq);
657}
658
f1126e95
FT		 659static void sd_unprep_fn(struct request_queue *q, struct request *rq)
660{
610a6349
FT		 661 if (rq->cmd_flags & REQ_DISCARD) {
662 free_page((unsigned long)rq->buffer);
663 rq->buffer = NULL;
664 }
e339c1a7
MP		 665}
666
1da177e4 667/**
2db93ce8 668 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 669 * information in the request structure.
670 * @SCpnt: pointer to mid-level's per scsi command structure that
671 * contains request and into which the scsi command is written
672 *
673 * Returns 1 if successful and 0 if error (or cannot be done now).
674 **/
7f9a6bc4 675static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 676{
7f9a6bc4
JB		 677 struct scsi_cmnd *SCpnt;
678 struct scsi_device *sdp = q->queuedata;
776b23a0 679 struct gendisk *disk = rq->rq_disk;
af55ff67 680 struct scsi_disk *sdkp;
83096ebf 681 sector_t block = blk_rq_pos(rq);
18351070 682 sector_t threshold;
83096ebf 683 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 684 int ret, host_dif;
4e7392ec 685 unsigned char protect;
7f9a6bc4 686
e339c1a7
MP		 687 /*
688 * Discard request come in as REQ_TYPE_FS but we turn them into
689 * block PC requests to make life easier.
690 */
66ac0280
CH		 691 if (rq->cmd_flags & REQ_DISCARD) {
692 ret = scsi_setup_discard_cmnd(sdp, rq);
693 goto out;
90467c29
FT		 694 } else if (rq->cmd_flags & REQ_FLUSH) {
695 ret = scsi_setup_flush_cmnd(sdp, rq);
696 goto out;
66ac0280 697 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 698 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
699 goto out;
700 } else if (rq->cmd_type != REQ_TYPE_FS) {
701 ret = BLKPREP_KILL;
702 goto out;
703 }
704 ret = scsi_setup_fs_cmnd(sdp, rq);
705 if (ret != BLKPREP_OK)
706 goto out;
707 SCpnt = rq->special;
af55ff67 708 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 709
710 /* from here on until we're complete, any goto out
711 * is used for a killable error condition */
712 ret = BLKPREP_KILL;
1da177e4 713
fa0d34be 714 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 715 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 716 "count=%d\n",
717 (unsigned long long)block,
718 this_count));
1da177e4
LT		 719
720 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 721 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 722 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 723 "Finishing %u sectors\n",
724 blk_rq_sectors(rq)));
fa0d34be
MP		 725 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
726 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 727 goto out;
1da177e4
LT		 728 }
729
730 if (sdp->changed) {
731 /*
732 * quietly refuse to do anything to a changed disc until
733 * the changed bit has been reset
734 */
3ff5588d 735 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 736 goto out;
1da177e4 737 }
7f9a6bc4 738
a0899d4d 739 /*
18351070
LT		 740 * Some SD card readers can't handle multi-sector accesses which touch
741 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 742 */
18351070
LT		 743 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
744 (sdp->sector_size / 512);
745
746 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
747 if (block < threshold) {
748 /* Access up to the threshold but not beyond */
749 this_count = threshold - block;
750 } else {
751 /* Access only a single hardware sector */
752 this_count = sdp->sector_size / 512;
753 }
754 }
a0899d4d 755
fa0d34be
MP		 756 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
757 (unsigned long long)block));
1da177e4
LT		 758
759 /*
760 * If we have a 1K hardware sectorsize, prevent access to single
761 * 512 byte sectors. In theory we could handle this - in fact
762 * the scsi cdrom driver must be able to handle this because
763 * we typically use 1K blocksizes, and cdroms typically have
764 * 2K hardware sectorsizes. Of course, things are simpler
765 * with the cdrom, since it is read-only. For performance
766 * reasons, the filesystems should be able to handle this
767 * and not force the scsi disk driver to use bounce buffers
768 * for this.
769 */
770 if (sdp->sector_size == 1024) {
83096ebf 771 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 772 scmd_printk(KERN_ERR, SCpnt,
773 "Bad block number requested\n");
7f9a6bc4 774 goto out;
1da177e4
LT		 775 } else {
776 block = block >> 1;
777 this_count = this_count >> 1;
778 }
779 }
780 if (sdp->sector_size == 2048) {
83096ebf 781 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 782 scmd_printk(KERN_ERR, SCpnt,
783 "Bad block number requested\n");
7f9a6bc4 784 goto out;
1da177e4
LT		 785 } else {
786 block = block >> 2;
787 this_count = this_count >> 2;
788 }
789 }
790 if (sdp->sector_size == 4096) {
83096ebf 791 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 792 scmd_printk(KERN_ERR, SCpnt,
793 "Bad block number requested\n");
7f9a6bc4 794 goto out;
1da177e4
LT		 795 } else {
796 block = block >> 3;
797 this_count = this_count >> 3;
798 }
799 }
800 if (rq_data_dir(rq) == WRITE) {
801 if (!sdp->writeable) {
7f9a6bc4 802 goto out;
1da177e4
LT		 803 }
804 SCpnt->cmnd[0] = WRITE_6;
805 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67
MP		 806
807 if (blk_integrity_rq(rq) &&
808 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
809 goto out;
810
1da177e4
LT		 811 } else if (rq_data_dir(rq) == READ) {
812 SCpnt->cmnd[0] = READ_6;
813 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
814 } else {
e73aec82 815 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
7f9a6bc4 816 goto out;
1da177e4
LT		 817 }
818
fa0d34be 819 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 820 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 821 (rq_data_dir(rq) == WRITE) ?
822 "writing" : "reading", this_count,
83096ebf 823 blk_rq_sectors(rq)));
1da177e4 824
af55ff67 825 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 826 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
827 if (host_dif)
4e7392ec 828 protect = 1 << 5;
af55ff67 829 else
4e7392ec
MP		 830 protect = 0;
831
832 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
833 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
834
835 if (unlikely(SCpnt->cmnd == NULL)) {
836 ret = BLKPREP_DEFER;
837 goto out;
838 }
af55ff67 839
4e7392ec
MP		 840 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
841 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
842 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
843 SCpnt->cmnd[7] = 0x18;
844 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 845 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 846
847 /* LBA */
848 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
849 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
850 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
851 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
852 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
853 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
854 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
855 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
856
857 /* Expected Indirect LBA */
858 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
859 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
860 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
861 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
862
863 /* Transfer length */
864 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
865 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
866 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
867 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
868 } else if (block > 0xffffffff) {
1da177e4 869 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 870 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 871 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
872 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
873 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
874 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
875 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
876 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
877 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
878 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
879 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
880 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
881 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
882 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
883 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
884 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 885 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 886 SCpnt->device->use_10_for_rw) {
887 if (this_count > 0xffff)
888 this_count = 0xffff;
889
890 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 891 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 892 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
893 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
894 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
895 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
896 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
897 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
898 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
899 } else {
33659ebb 900 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 901 /*
902 * This happens only if this drive failed
903 * 10byte rw command with ILLEGAL_REQUEST
904 * during operation and thus turned off
905 * use_10_for_rw.
906 */
e73aec82
MP		 907 scmd_printk(KERN_ERR, SCpnt,
908 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 909 goto out;
007365ad
TH		 910 }
911
1da177e4
LT		 912 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
913 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
914 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
915 SCpnt->cmnd[4] = (unsigned char) this_count;
916 SCpnt->cmnd[5] = 0;
917 }
30b0c37b 918 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 919
af55ff67 920 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 921 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 922 sd_prot_op(SCpnt, host_dif);
af55ff67 923
1da177e4
LT		 924 /*
925 * We shouldn't disconnect in the middle of a sector, so with a dumb
926 * host adapter, it's safe to assume that we can at least transfer
927 * this many bytes between each connect / disconnect.
928 */
929 SCpnt->transfersize = sdp->sector_size;
930 SCpnt->underflow = this_count << 9;
931 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 932
1da177e4
LT		 933 /*
934 * This indicates that the command is ready from our end to be
935 * queued.
936 */
7f9a6bc4
JB		 937 ret = BLKPREP_OK;
938 out:
939 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 940}
941
942/**
943 * sd_open - open a scsi disk device
944 * @inode: only i_rdev member may be used
945 * @filp: only f_mode and f_flags may be used
946 *
947 * Returns 0 if successful. Returns a negated errno value in case
948 * of error.
949 *
950 * Note: This can be called from a user context (e.g. fsck(1) )
951 * or from within the kernel (e.g. as a result of a mount(1) ).
952 * In the latter case @inode and @filp carry an abridged amount
953 * of information as noted above.
409f3499
AB		 954 *
955 * Locking: called with bdev->bd_mutex held.
1da177e4 956 **/
0338e291 957static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 958{
0338e291 959 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 960 struct scsi_device *sdev;
961 int retval;
962
0338e291 963 if (!sdkp)
1da177e4
LT		 964 return -ENXIO;
965
fa0d34be 966 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 967
968 sdev = sdkp->device;
969
478a8a05
AS		 970 retval = scsi_autopm_get_device(sdev);
971 if (retval)
972 goto error_autopm;
973
1da177e4
LT		 974 /*
975 * If the device is in error recovery, wait until it is done.
976 * If the device is offline, then disallow any access to it.
977 */
978 retval = -ENXIO;
979 if (!scsi_block_when_processing_errors(sdev))
980 goto error_out;
981
982 if (sdev->removable || sdkp->write_prot)
0338e291 983 check_disk_change(bdev);
1da177e4
LT		 984
985 /*
986 * If the drive is empty, just let the open fail.
987 */
988 retval = -ENOMEDIUM;
0338e291 989 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 990 goto error_out;
991
992 /*
993 * If the device has the write protect tab set, have the open fail
994 * if the user expects to be able to write to the thing.
995 */
996 retval = -EROFS;
0338e291 997 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 998 goto error_out;
999
1000 /*
1001 * It is possible that the disk changing stuff resulted in
1002 * the device being taken offline. If this is the case,
1003 * report this to the user, and don't pretend that the
1004 * open actually succeeded.
1005 */
1006 retval = -ENXIO;
1007 if (!scsi_device_online(sdev))
1008 goto error_out;
1009
409f3499 1010 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1011 if (scsi_block_when_processing_errors(sdev))
1012 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1013 }
1014
1015 return 0;
1016
1017error_out:
478a8a05
AS		 1018 scsi_autopm_put_device(sdev);
1019error_autopm:
1da177e4
LT		 1020 scsi_disk_put(sdkp);
1021 return retval;
1022}
1023
1024/**
1025 * sd_release - invoked when the (last) close(2) is called on this
1026 * scsi disk.
1027 * @inode: only i_rdev member may be used
1028 * @filp: only f_mode and f_flags may be used
1029 *
1030 * Returns 0.
1031 *
1032 * Note: may block (uninterruptible) if error recovery is underway
1033 * on this disk.
409f3499
AB		 1034 *
1035 * Locking: called with bdev->bd_mutex held.
1da177e4 1036 **/
0338e291 1037static int sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1038{
1da177e4
LT		 1039 struct scsi_disk *sdkp = scsi_disk(disk);
1040 struct scsi_device *sdev = sdkp->device;
1041
56937f7b 1042 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1043
7e443312 1044 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1045 if (scsi_block_when_processing_errors(sdev))
1046 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1047 }
1048
1049 /*
1050 * XXX and what if there are packets in flight and this close()
1051 * XXX is followed by a "rmmod sd_mod"?
1052 */
478a8a05
AS		 1053
1054 scsi_autopm_put_device(sdev);
1da177e4
LT		 1055 scsi_disk_put(sdkp);
1056 return 0;
1057}
1058
a885c8c4 1059static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1060{
1061 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1062 struct scsi_device *sdp = sdkp->device;
1063 struct Scsi_Host *host = sdp->host;
1064 int diskinfo[4];
1065
1066 /* default to most commonly used values */
1067 diskinfo[0] = 0x40; /* 1 << 6 */
1068 diskinfo[1] = 0x20; /* 1 << 5 */
1069 diskinfo[2] = sdkp->capacity >> 11;
1070
1071 /* override with calculated, extended default, or driver values */
1072 if (host->hostt->bios_param)
1073 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1074 else
1075 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1076
a885c8c4
CH		 1077 geo->heads = diskinfo[0];
1078 geo->sectors = diskinfo[1];
1079 geo->cylinders = diskinfo[2];
1da177e4
LT		 1080 return 0;
1081}
1082
1083/**
1084 * sd_ioctl - process an ioctl
1085 * @inode: only i_rdev/i_bdev members may be used
1086 * @filp: only f_mode and f_flags may be used
1087 * @cmd: ioctl command number
1088 * @arg: this is third argument given to ioctl(2) system call.
1089 * Often contains a pointer.
1090 *
25985edc 1091 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1092 * success as well). Returns a negated errno value in case of error.
1093 *
1094 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1095 * down in the scsi subsystem.
1da177e4 1096 **/
0338e291 1097static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1098 unsigned int cmd, unsigned long arg)
1099{
1da177e4 1100 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1101 struct scsi_disk *sdkp = scsi_disk(disk);
1102 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1103 void __user *p = (void __user *)arg;
1104 int error;
1105
fe2d1851
NN		 1106 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1107 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1108
0bfc96cb
PB		 1109 error = scsi_verify_blk_ioctl(bdev, cmd);
1110 if (error < 0)
1111 return error;
1112
1da177e4
LT		 1113 /*
1114 * If we are in the middle of error recovery, don't let anyone
1115 * else try and use this device. Also, if error recovery fails, it
1116 * may try and take the device offline, in which case all further
1117 * access to the device is prohibited.
1118 */
83ff6fe8 1119 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1120 (mode & FMODE_NDELAY) != 0);
1da177e4 1121 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1122 goto out;
1da177e4 1123
1da177e4
LT		 1124 /*
1125 * Send SCSI addressing ioctls directly to mid level, send other
1126 * ioctls to block level and then onto mid level if they can't be
1127 * resolved.
1128 */
1129 switch (cmd) {
1130 case SCSI_IOCTL_GET_IDLUN:
1131 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1132 error = scsi_ioctl(sdp, cmd, p);
1133 break;
1da177e4 1134 default:
577ebb37 1135 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1136 if (error != -ENOTTY)
8a6cfeb6
AB		 1137 break;
1138 error = scsi_ioctl(sdp, cmd, p);
1139 break;
1da177e4 1140 }
8a6cfeb6 1141out:
8a6cfeb6 1142 return error;
1da177e4
LT		 1143}
1144
1145static void set_media_not_present(struct scsi_disk *sdkp)
1146{
2bae0093
TH		 1147 if (sdkp->media_present)
1148 sdkp->device->changed = 1;
1149
1150 if (sdkp->device->removable) {
1151 sdkp->media_present = 0;
1152 sdkp->capacity = 0;
1153 }
1154}
1155
1156static int media_not_present(struct scsi_disk *sdkp,
1157 struct scsi_sense_hdr *sshdr)
1158{
1159 if (!scsi_sense_valid(sshdr))
1160 return 0;
1161
1162 /* not invoked for commands that could return deferred errors */
1163 switch (sshdr->sense_key) {
1164 case UNIT_ATTENTION:
1165 case NOT_READY:
1166 /* medium not present */
1167 if (sshdr->asc == 0x3A) {
1168 set_media_not_present(sdkp);
1169 return 1;
1170 }
1171 }
1172 return 0;
1da177e4
LT		 1173}
1174
1175/**
2bae0093
TH		 1176 * sd_check_events - check media events
1177 * @disk: kernel device descriptor
1178 * @clearing: disk events currently being cleared
1da177e4 1179 *
2bae0093 1180 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1181 *
1182 * Note: this function is invoked from the block subsystem.
1183 **/
2bae0093 1184static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1185{
1186 struct scsi_disk *sdkp = scsi_disk(disk);
1187 struct scsi_device *sdp = sdkp->device;
001aac25 1188 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1189 int retval;
1190
2bae0093 1191 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1192
1193 /*
1194 * If the device is offline, don't send any commands - just pretend as
1195 * if the command failed. If the device ever comes back online, we
1196 * can deal with it then. It is only because of unrecoverable errors
1197 * that we would ever take a device offline in the first place.
1198 */
285e9670
KS		 1199 if (!scsi_device_online(sdp)) {
1200 set_media_not_present(sdkp);
285e9670
KS		 1201 goto out;
1202 }
1da177e4
LT		 1203
1204 /*
1205 * Using TEST_UNIT_READY enables differentiation between drive with
1206 * no cartridge loaded - NOT READY, drive with changed cartridge -
1207 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1208 *
1209 * Drives that auto spin down. eg iomega jaz 1G, will be started
1210 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1211 * sd_revalidate() is called.
1212 */
1213 retval = -ENODEV;
285e9670 1214
001aac25 1215 if (scsi_block_when_processing_errors(sdp)) {
4e2247b2
LT		 1216 retval = scsi_autopm_get_device(sdp);
1217 if (retval)
1218 goto out;
1219
001aac25
JB		 1220 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1221 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1222 sshdr);
4e2247b2 1223 scsi_autopm_put_device(sdp);
001aac25 1224 }
1da177e4 1225
2bae0093
TH		 1226 /* failed to execute TUR, assume media not present */
1227 if (host_byte(retval)) {
285e9670 1228 set_media_not_present(sdkp);
285e9670
KS		 1229 goto out;
1230 }
1da177e4 1231
2bae0093
TH		 1232 if (media_not_present(sdkp, sshdr))
1233 goto out;
1234
1da177e4
LT		 1235 /*
1236 * For removable scsi disk we have to recognise the presence
2bae0093 1237 * of a disk in the drive.
1da177e4 1238 */
2bae0093
TH		 1239 if (!sdkp->media_present)
1240 sdp->changed = 1;
1da177e4 1241 sdkp->media_present = 1;
285e9670 1242out:
3ff5588d 1243 /*
2bae0093 1244 * sdp->changed is set under the following conditions:
3ff5588d 1245 *
2bae0093
TH		 1246 * Medium present state has changed in either direction.
1247 * Device has indicated UNIT_ATTENTION.
3ff5588d 1248 */
001aac25 1249 kfree(sshdr);
2bae0093
TH		 1250 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1251 sdp->changed = 0;
1da177e4 1252 return retval;
1da177e4
LT		 1253}
1254
e73aec82 1255static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1256{
1da177e4 1257 int retries, res;
e73aec82 1258 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1259 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1260
1261 if (!scsi_device_online(sdp))
1262 return -ENODEV;
1263
1da177e4 1264
1da177e4
LT		 1265 for (retries = 3; retries > 0; --retries) {
1266 unsigned char cmd[10] = { 0 };
1267
1268 cmd[0] = SYNCHRONIZE_CACHE;
1269 /*
1270 * Leave the rest of the command zero to indicate
1271 * flush everything.
1272 */
ea73a9f2 1273 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
e3b3e624 1274 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
ea73a9f2 1275 if (res == 0)
1da177e4
LT		 1276 break;
1277 }
1278
e73aec82
MP		 1279 if (res) {
1280 sd_print_result(sdkp, res);
1281 if (driver_byte(res) & DRIVER_SENSE)
1282 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1283 }
1284
3721050a
TH		 1285 if (res)
1286 return -EIO;
1287 return 0;
1da177e4
LT		 1288}
1289
1da177e4
LT		 1290static void sd_rescan(struct device *dev)
1291{
39b7f1e2
AS		 1292 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1293
1294 if (sdkp) {
f98a8cae 1295 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1296 scsi_disk_put(sdkp);
1297 }
1da177e4
LT		 1298}
1299
1300
1301#ifdef CONFIG_COMPAT
1302/*
1303 * This gets directly called from VFS. When the ioctl
1304 * is not recognized we go back to the other translation paths.
1305 */
0338e291
AV		 1306static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1307 unsigned int cmd, unsigned long arg)
1da177e4 1308{
0338e291 1309 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1310 int ret;
1311
1312 ret = scsi_verify_blk_ioctl(bdev, cmd);
1313 if (ret < 0)
1314 return ret;
1da177e4
LT		 1315
1316 /*
1317 * If we are in the middle of error recovery, don't let anyone
1318 * else try and use this device. Also, if error recovery fails, it
1319 * may try and take the device offline, in which case all further
1320 * access to the device is prohibited.
1321 */
1322 if (!scsi_block_when_processing_errors(sdev))
1323 return -ENODEV;
1324
1325 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1326 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1327
1328 return ret;
1329 }
1330
1331 /*
1332 * Let the static ioctl translation table take care of it.
1333 */
1334 return -ENOIOCTLCMD;
1335}
1336#endif
1337
83d5cde4 1338static const struct block_device_operations sd_fops = {
1da177e4 1339 .owner = THIS_MODULE,
0338e291
AV		 1340 .open = sd_open,
1341 .release = sd_release,
8a6cfeb6 1342 .ioctl = sd_ioctl,
a885c8c4 1343 .getgeo = sd_getgeo,
1da177e4 1344#ifdef CONFIG_COMPAT
0338e291 1345 .compat_ioctl = sd_compat_ioctl,
1da177e4 1346#endif
2bae0093 1347 .check_events = sd_check_events,
1da177e4 1348 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1349 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1350};
1351
18a4d0a2
MP		 1352/**
1353 * sd_eh_action - error handling callback
1354 * @scmd: sd-issued command that has failed
1355 * @eh_cmnd: The command that was sent during error handling
1356 * @eh_cmnd_len: Length of eh_cmnd in bytes
1357 * @eh_disp: The recovery disposition suggested by the midlayer
1358 *
1359 * This function is called by the SCSI midlayer upon completion of
1360 * an error handling command (TEST UNIT READY, START STOP UNIT,
1361 * etc.) The command sent to the device by the error handler is
1362 * stored in eh_cmnd. The result of sending the eh command is
1363 * passed in eh_disp.
1364 **/
1365static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1366 int eh_cmnd_len, int eh_disp)
1367{
1368 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1369
1370 if (!scsi_device_online(scmd->device) ||
1371 !scsi_medium_access_command(scmd))
1372 return eh_disp;
1373
1374 /*
1375 * The device has timed out executing a medium access command.
1376 * However, the TEST UNIT READY command sent during error
1377 * handling completed successfully. Either the device is in the
1378 * process of recovering or has it suffered an internal failure
1379 * that prevents access to the storage medium.
1380 */
1381 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1382 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1383 sdkp->medium_access_timed_out++;
1384
1385 /*
1386 * If the device keeps failing read/write commands but TEST UNIT
1387 * READY always completes successfully we assume that medium
1388 * access is no longer possible and take the device offline.
1389 */
1390 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1391 scmd_printk(KERN_ERR, scmd,
1392 "Medium access timeout failure. Offlining disk!\n");
1393 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1394
1395 return FAILED;
1396 }
1397
1398 return eh_disp;
1399}
1400
af55ff67
MP		 1401static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1402{
83096ebf
TH		 1403 u64 start_lba = blk_rq_pos(scmd->request);
1404 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1405 u64 bad_lba;
1406 int info_valid;
a8733c7b
JB		 1407 /*
1408 * resid is optional but mostly filled in. When it's unused,
1409 * its value is zero, so we assume the whole buffer transferred
1410 */
1411 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1412 unsigned int good_bytes;
af55ff67 1413
33659ebb 1414 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1415 return 0;
1416
1417 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1418 SCSI_SENSE_BUFFERSIZE,
1419 &bad_lba);
1420 if (!info_valid)
1421 return 0;
1422
1423 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1424 return 0;
1425
1426 if (scmd->device->sector_size < 512) {
1427 /* only legitimate sector_size here is 256 */
1428 start_lba <<= 1;
1429 end_lba <<= 1;
1430 } else {
1431 /* be careful ... don't want any overflows */
1432 u64 factor = scmd->device->sector_size / 512;
1433 do_div(start_lba, factor);
1434 do_div(end_lba, factor);
1435 }
1436
1437 /* The bad lba was reported incorrectly, we have no idea where
1438 * the error is.
1439 */
1440 if (bad_lba < start_lba || bad_lba >= end_lba)
1441 return 0;
1442
1443 /* This computation should always be done in terms of
1444 * the resolution of the device's medium.
1445 */
a8733c7b
JB		 1446 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1447 return min(good_bytes, transferred);
af55ff67
MP		 1448}
1449
1da177e4 1450/**
7b3d9545 1451 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1452 * driver has completed (successfully or otherwise) a scsi command.
1453 * @SCpnt: mid-level's per command structure.
1454 *
1455 * Note: potentially run from within an ISR. Must not block.
1456 **/
7b3d9545 1457static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1458{
1459 int result = SCpnt->result;
af55ff67 1460 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1461 struct scsi_sense_hdr sshdr;
4e7392ec 1462 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1da177e4
LT		 1463 int sense_valid = 0;
1464 int sense_deferred = 0;
c98a0eb0 1465 unsigned char op = SCpnt->cmnd[0];
1da177e4 1466
c98a0eb0
MP		 1467 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1468 scsi_set_resid(SCpnt, 0);
6a32a8ae 1469
1da177e4
LT		 1470 if (result) {
1471 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1472 if (sense_valid)
1473 sense_deferred = scsi_sense_is_deferred(&sshdr);
1474 }
1da177e4 1475#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1476 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1477 if (sense_valid) {
fa0d34be 1478 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1479 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1480 "ascq]=%x,%x,%x,%x\n",
1481 sshdr.response_code,
1482 sshdr.sense_key, sshdr.asc,
1483 sshdr.ascq));
1da177e4
LT		 1484 }
1485#endif
03aba2f7
LT		 1486 if (driver_byte(result) != DRIVER_SENSE &&
1487 (!sense_valid || sense_deferred))
1488 goto out;
1489
18a4d0a2
MP		 1490 sdkp->medium_access_timed_out = 0;
1491
03aba2f7
LT		 1492 switch (sshdr.sense_key) {
1493 case HARDWARE_ERROR:
1494 case MEDIUM_ERROR:
af55ff67 1495 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1496 break;
1497 case RECOVERED_ERROR:
af55ff67
MP		 1498 good_bytes = scsi_bufflen(SCpnt);
1499 break;
10dab226
JW		 1500 case NO_SENSE:
1501 /* This indicates a false check condition, so ignore it. An
1502 * unknown amount of data was transferred so treat it as an
1503 * error.
1504 */
1505 scsi_print_sense("sd", SCpnt);
1506 SCpnt->result = 0;
1507 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1508 break;
c98a0eb0
MP		 1509 case ABORTED_COMMAND:
1510 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1511 good_bytes = sd_completed_bytes(SCpnt);
1512 break;
1513 case ILLEGAL_REQUEST:
1514 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1515 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0
MP		 1516 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1517 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1518 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1519 sd_config_discard(sdkp, SD_LBP_DISABLE);
03aba2f7
LT		 1520 break;
1521 default:
1522 break;
1da177e4 1523 }
03aba2f7 1524 out:
af55ff67
MP		 1525 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1526 sd_dif_complete(SCpnt, good_bytes);
1527
4e7392ec 1528 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
77c9cfc5
MP		 1529 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1530
1531 /* We have to print a failed command here as the
1532 * extended CDB gets freed before scsi_io_completion()
1533 * is called.
1534 */
1535 if (result)
1536 scsi_print_command(SCpnt);
1537
4e7392ec 1538 mempool_free(SCpnt->cmnd, sd_cdb_pool);
77c9cfc5
MP		 1539 SCpnt->cmnd = NULL;
1540 SCpnt->cmd_len = 0;
1541 }
4e7392ec 1542
7b3d9545 1543 return good_bytes;
1da177e4
LT		 1544}
1545
1da177e4
LT		 1546/*
1547 * spinup disk - called only in sd_revalidate_disk()
1548 */
1549static void
e73aec82 1550sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1551{
1da177e4 1552 unsigned char cmd[10];
4451e472 1553 unsigned long spintime_expire = 0;
1da177e4
LT		 1554 int retries, spintime;
1555 unsigned int the_result;
1556 struct scsi_sense_hdr sshdr;
1557 int sense_valid = 0;
1558
1559 spintime = 0;
1560
1561 /* Spin up drives, as required. Only do this at boot time */
1562 /* Spinup needs to be done for module loads too. */
1563 do {
1564 retries = 0;
1565
1566 do {
1567 cmd[0] = TEST_UNIT_READY;
1568 memset((void *) &cmd[1], 0, 9);
1569
ea73a9f2
JB		 1570 the_result = scsi_execute_req(sdkp->device, cmd,
1571 DMA_NONE, NULL, 0,
1572 &sshdr, SD_TIMEOUT,
f4f4e47e 1573 SD_MAX_RETRIES, NULL);
1da177e4 1574
b4d38e38
AS		 1575 /*
1576 * If the drive has indicated to us that it
1577 * doesn't have any media in it, don't bother
1578 * with any more polling.
1579 */
1580 if (media_not_present(sdkp, &sshdr))
1581 return;
1582
1da177e4 1583 if (the_result)
ea73a9f2 1584 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1585 retries++;
1586 } while (retries < 3 &&
1587 (!scsi_status_is_good(the_result) ||
1588 ((driver_byte(the_result) & DRIVER_SENSE) &&
1589 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1590
1da177e4
LT		 1591 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1592 /* no sense, TUR either succeeded or failed
1593 * with a status error */
e73aec82
MP		 1594 if(!spintime && !scsi_status_is_good(the_result)) {
1595 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1596 sd_print_result(sdkp, the_result);
1597 }
1da177e4
LT		 1598 break;
1599 }
1600
1601 /*
1602 * The device does not want the automatic start to be issued.
1603 */
33dd6f92 1604 if (sdkp->device->no_start_on_add)
1da177e4 1605 break;
1da177e4 1606
33dd6f92
MW		 1607 if (sense_valid && sshdr.sense_key == NOT_READY) {
1608 if (sshdr.asc == 4 && sshdr.ascq == 3)
1609 break; /* manual intervention required */
1610 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1611 break; /* standby */
1612 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1613 break; /* unavailable */
1614 /*
1615 * Issue command to spin up drive when not ready
1616 */
1da177e4 1617 if (!spintime) {
e73aec82 1618 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1619 cmd[0] = START_STOP;
1620 cmd[1] = 1; /* Return immediately */
1621 memset((void *) &cmd[2], 0, 8);
1622 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1623 if (sdkp->device->start_stop_pwr_cond)
1624 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1625 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1626 NULL, 0, &sshdr,
f4f4e47e
FT		 1627 SD_TIMEOUT, SD_MAX_RETRIES,
1628 NULL);
4451e472
AS		 1629 spintime_expire = jiffies + 100 * HZ;
1630 spintime = 1;
1da177e4 1631 }
1da177e4
LT		 1632 /* Wait 1 second for next try */
1633 msleep(1000);
1634 printk(".");
4451e472
AS		 1635
1636 /*
1637 * Wait for USB flash devices with slow firmware.
1638 * Yes, this sense key/ASC combination shouldn't
1639 * occur here. It's characteristic of these devices.
1640 */
1641 } else if (sense_valid &&
1642 sshdr.sense_key == UNIT_ATTENTION &&
1643 sshdr.asc == 0x28) {
1644 if (!spintime) {
1645 spintime_expire = jiffies + 5 * HZ;
1646 spintime = 1;
1647 }
1648 /* Wait 1 second for next try */
1649 msleep(1000);
1da177e4
LT		 1650 } else {
1651 /* we don't understand the sense code, so it's
1652 * probably pointless to loop */
1653 if(!spintime) {
e73aec82
MP		 1654 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1655 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1656 }
1657 break;
1658 }
1659
4451e472 1660 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1661
1662 if (spintime) {
1663 if (scsi_status_is_good(the_result))
1664 printk("ready\n");
1665 else
1666 printk("not responding...\n");
1667 }
1668}
1669
e0597d70
MP		 1670
1671/*
1672 * Determine whether disk supports Data Integrity Field.
1673 */
439d77f7 1674static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1675{
1676 struct scsi_device *sdp = sdkp->device;
1677 u8 type;
1678
1679 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
35e1a5d9
MP		 1680 return;
1681
1682 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1683
1684 if (type == sdkp->protection_type || !sdkp->first_scan)
1685 return;
e0597d70 1686
be922f47
MP		 1687 sdkp->protection_type = type;
1688
4e7392ec 1689 if (type > SD_DIF_TYPE3_PROTECTION) {
35e1a5d9
MP		 1690 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1691 "protection type %u. Disabling disk!\n", type);
1692 sdkp->capacity = 0;
1693 return;
e0597d70
MP		 1694 }
1695
35e1a5d9
MP		 1696 if (scsi_host_dif_capable(sdp->host, type))
1697 sd_printk(KERN_NOTICE, sdkp,
1698 "Enabling DIF Type %u protection\n", type);
1699 else
1700 sd_printk(KERN_NOTICE, sdkp,
1701 "Disabling DIF Type %u protection\n", type);
e0597d70
MP		 1702}
1703
0da205e0
MW		 1704static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1705 struct scsi_sense_hdr *sshdr, int sense_valid,
1706 int the_result)
1707{
1708 sd_print_result(sdkp, the_result);
1709 if (driver_byte(the_result) & DRIVER_SENSE)
1710 sd_print_sense_hdr(sdkp, sshdr);
1711 else
1712 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1713
1714 /*
1715 * Set dirty bit for removable devices if not ready -
1716 * sometimes drives will not report this properly.
1717 */
1718 if (sdp->removable &&
1719 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1720 set_media_not_present(sdkp);
0da205e0
MW		 1721
1722 /*
1723 * We used to set media_present to 0 here to indicate no media
1724 * in the drive, but some drives fail read capacity even with
1725 * media present, so we can't do that.
1726 */
1727 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1728}
1729
1730#define RC16_LEN 32
1731#if RC16_LEN > SD_BUF_SIZE
1732#error RC16_LEN must not be more than SD_BUF_SIZE
1733#endif
1734
3233ac19
JB		 1735#define READ_CAPACITY_RETRIES_ON_RESET 10
1736
0da205e0
MW		 1737static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1738 unsigned char *buffer)
ea73a9f2 1739{
1da177e4 1740 unsigned char cmd[16];
1da177e4
LT		 1741 struct scsi_sense_hdr sshdr;
1742 int sense_valid = 0;
0da205e0 1743 int the_result;
3233ac19 1744 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1745 unsigned int alignment;
0da205e0
MW		 1746 unsigned long long lba;
1747 unsigned sector_size;
1da177e4 1748
5ce524bd
HG		 1749 if (sdp->no_read_capacity_16)
1750 return -EINVAL;
1751
1da177e4 1752 do {
0da205e0
MW		 1753 memset(cmd, 0, 16);
1754 cmd[0] = SERVICE_ACTION_IN;
1755 cmd[1] = SAI_READ_CAPACITY_16;
1756 cmd[13] = RC16_LEN;
1757 memset(buffer, 0, RC16_LEN);
1758
ea73a9f2 1759 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1760 buffer, RC16_LEN, &sshdr,
1761 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1762
ea73a9f2 1763 if (media_not_present(sdkp, &sshdr))
0da205e0 1764 return -ENODEV;
1da177e4 1765
2b301307 1766 if (the_result) {
ea73a9f2 1767 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1768 if (sense_valid &&
1769 sshdr.sense_key == ILLEGAL_REQUEST &&
1770 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1771 sshdr.ascq == 0x00)
1772 /* Invalid Command Operation Code or
1773 * Invalid Field in CDB, just retry
1774 * silently with RC10 */
1775 return -EINVAL;
3233ac19
JB		 1776 if (sense_valid &&
1777 sshdr.sense_key == UNIT_ATTENTION &&
1778 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1779 /* Device reset might occur several times,
1780 * give it one more chance */
1781 if (--reset_retries > 0)
1782 continue;
2b301307 1783 }
1da177e4
LT		 1784 retries--;
1785
1786 } while (the_result && retries);
1787
0da205e0 1788 if (the_result) {
e73aec82 1789 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 1790 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1791 return -EINVAL;
1792 }
e73aec82 1793
8f76d151
DH		 1794 sector_size = get_unaligned_be32(&buffer[8]);
1795 lba = get_unaligned_be64(&buffer[0]);
0da205e0
MW		 1796
1797 sd_read_protection_type(sdkp, buffer);
1798
1799 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1800 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1801 "kernel compiled with support for large block "
1802 "devices.\n");
1803 sdkp->capacity = 0;
1804 return -EOVERFLOW;
1805 }
1806
ea09bcc9 1807 /* Logical blocks per physical block exponent */
526f7c79 1808 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 1809
1810 /* Lowest aligned logical block */
1811 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1812 blk_queue_alignment_offset(sdp->request_queue, alignment);
1813 if (alignment && sdkp->first_scan)
1814 sd_printk(KERN_NOTICE, sdkp,
1815 "physical block alignment offset: %u\n", alignment);
1816
c98a0eb0
MP		 1817 if (buffer[14] & 0x80) { /* LBPME */
1818 sdkp->lbpme = 1;
e339c1a7 1819
c98a0eb0
MP		 1820 if (buffer[14] & 0x40) /* LBPRZ */
1821 sdkp->lbprz = 1;
e339c1a7 1822
c98a0eb0 1823 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 1824 }
1825
0da205e0
MW		 1826 sdkp->capacity = lba + 1;
1827 return sector_size;
1828}
1829
1830static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1831 unsigned char *buffer)
1832{
1833 unsigned char cmd[16];
1834 struct scsi_sense_hdr sshdr;
1835 int sense_valid = 0;
1836 int the_result;
3233ac19 1837 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 1838 sector_t lba;
1839 unsigned sector_size;
1840
1841 do {
1842 cmd[0] = READ_CAPACITY;
1843 memset(&cmd[1], 0, 9);
1844 memset(buffer, 0, 8);
1845
1846 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1847 buffer, 8, &sshdr,
1848 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1849
1850 if (media_not_present(sdkp, &sshdr))
1851 return -ENODEV;
1852
3233ac19 1853 if (the_result) {
0da205e0 1854 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 1855 if (sense_valid &&
1856 sshdr.sense_key == UNIT_ATTENTION &&
1857 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1858 /* Device reset might occur several times,
1859 * give it one more chance */
1860 if (--reset_retries > 0)
1861 continue;
1862 }
0da205e0
MW		 1863 retries--;
1864
1865 } while (the_result && retries);
1866
1867 if (the_result) {
1868 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1869 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1870 return -EINVAL;
1871 }
1872
8f76d151
DH		 1873 sector_size = get_unaligned_be32(&buffer[4]);
1874 lba = get_unaligned_be32(&buffer[0]);
0da205e0 1875
5ce524bd
HG		 1876 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1877 /* Some buggy (usb cardreader) devices return an lba of
1878 0xffffffff when the want to report a size of 0 (with
1879 which they really mean no media is present) */
1880 sdkp->capacity = 0;
5cc10350 1881 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 1882 return sector_size;
1883 }
1884
0da205e0
MW		 1885 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1886 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1887 "kernel compiled with support for large block "
1888 "devices.\n");
1889 sdkp->capacity = 0;
1890 return -EOVERFLOW;
1891 }
1892
1893 sdkp->capacity = lba + 1;
526f7c79 1894 sdkp->physical_block_size = sector_size;
0da205e0
MW		 1895 return sector_size;
1896}
1897
2b301307
MW		 1898static int sd_try_rc16_first(struct scsi_device *sdp)
1899{
f87146bb
HR		 1900 if (sdp->host->max_cmd_len < 16)
1901 return 0;
6a0bdffa
AS		 1902 if (sdp->try_rc_10_first)
1903 return 0;
2b301307
MW		 1904 if (sdp->scsi_level > SCSI_SPC_2)
1905 return 1;
1906 if (scsi_device_protection(sdp))
1907 return 1;
1908 return 0;
1909}
1910
0da205e0
MW		 1911/*
1912 * read disk capacity
1913 */
1914static void
1915sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1916{
1917 int sector_size;
1918 struct scsi_device *sdp = sdkp->device;
70a9b873 1919 sector_t old_capacity = sdkp->capacity;
0da205e0 1920
2b301307 1921 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 1922 sector_size = read_capacity_16(sdkp, sdp, buffer);
1923 if (sector_size == -EOVERFLOW)
1da177e4 1924 goto got_data;
2b301307
MW		 1925 if (sector_size == -ENODEV)
1926 return;
1927 if (sector_size < 0)
1928 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 1929 if (sector_size < 0)
1930 return;
1da177e4 1931 } else {
0da205e0
MW		 1932 sector_size = read_capacity_10(sdkp, sdp, buffer);
1933 if (sector_size == -EOVERFLOW)
1934 goto got_data;
1935 if (sector_size < 0)
1936 return;
1937 if ((sizeof(sdkp->capacity) > 4) &&
1938 (sdkp->capacity > 0xffffffffULL)) {
1939 int old_sector_size = sector_size;
1940 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1941 "Trying to use READ CAPACITY(16).\n");
1942 sector_size = read_capacity_16(sdkp, sdp, buffer);
1943 if (sector_size < 0) {
1944 sd_printk(KERN_NOTICE, sdkp,
1945 "Using 0xffffffff as device size\n");
1946 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1947 sector_size = old_sector_size;
1948 goto got_data;
1949 }
1950 }
1951 }
1da177e4 1952
5c211caa
AS		 1953 /* Some devices are known to return the total number of blocks,
1954 * not the highest block number. Some devices have versions
1955 * which do this and others which do not. Some devices we might
1956 * suspect of doing this but we don't know for certain.
1957 *
1958 * If we know the reported capacity is wrong, decrement it. If
1959 * we can only guess, then assume the number of blocks is even
1960 * (usually true but not always) and err on the side of lowering
1961 * the capacity.
1962 */
1963 if (sdp->fix_capacity ||
1964 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1965 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1966 "from its reported value: %llu\n",
1967 (unsigned long long) sdkp->capacity);
1da177e4 1968 --sdkp->capacity;
61bf54b7
ON		 1969 }
1970
1da177e4
LT		 1971got_data:
1972 if (sector_size == 0) {
1973 sector_size = 512;
e73aec82
MP		 1974 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1975 "assuming 512.\n");
1da177e4
LT		 1976 }
1977
1978 if (sector_size != 512 &&
1979 sector_size != 1024 &&
1980 sector_size != 2048 &&
1981 sector_size != 4096 &&
1982 sector_size != 256) {
e73aec82
MP		 1983 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1984 sector_size);
1da177e4
LT		 1985 /*
1986 * The user might want to re-format the drive with
1987 * a supported sectorsize. Once this happens, it
1988 * would be relatively trivial to set the thing up.
1989 * For this reason, we leave the thing in the table.
1990 */
1991 sdkp->capacity = 0;
1992 /*
1993 * set a bogus sector size so the normal read/write
1994 * logic in the block layer will eventually refuse any
1995 * request on this device without tripping over power
1996 * of two sector size assumptions
1997 */
1998 sector_size = 512;
1999 }
e1defc4f 2000 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2001
1da177e4 2002 {
7404ad3b 2003 char cap_str_2[10], cap_str_10[10];
520a2c27 2004 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2005
7404ad3b
JB		 2006 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2007 sizeof(cap_str_2));
2008 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2009 sizeof(cap_str_10));
1da177e4 2010
ea09bcc9 2011 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2012 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2013 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2014 (unsigned long long)sdkp->capacity,
2015 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2016
526f7c79 2017 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2018 sd_printk(KERN_NOTICE, sdkp,
2019 "%u-byte physical blocks\n",
526f7c79 2020 sdkp->physical_block_size);
ea09bcc9 2021 }
1da177e4
LT		 2022 }
2023
2024 /* Rescale capacity to 512-byte units */
2025 if (sector_size == 4096)
2026 sdkp->capacity <<= 3;
2027 else if (sector_size == 2048)
2028 sdkp->capacity <<= 2;
2029 else if (sector_size == 1024)
2030 sdkp->capacity <<= 1;
2031 else if (sector_size == 256)
2032 sdkp->capacity >>= 1;
2033
526f7c79
MP		 2034 blk_queue_physical_block_size(sdp->request_queue,
2035 sdkp->physical_block_size);
1da177e4
LT		 2036 sdkp->device->sector_size = sector_size;
2037}
2038
2039/* called with buffer of length 512 */
2040static inline int
ea73a9f2
JB		 2041sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2042 unsigned char *buffer, int len, struct scsi_mode_data *data,
2043 struct scsi_sense_hdr *sshdr)
1da177e4 2044{
ea73a9f2 2045 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2046 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2047 sshdr);
1da177e4
LT		 2048}
2049
2050/*
2051 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2052 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2053 */
2054static void
e73aec82 2055sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2056{
1da177e4 2057 int res;
ea73a9f2 2058 struct scsi_device *sdp = sdkp->device;
1da177e4 2059 struct scsi_mode_data data;
70a9b873 2060 int old_wp = sdkp->write_prot;
1da177e4
LT		 2061
2062 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2063 if (sdp->skip_ms_page_3f) {
e73aec82 2064 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2065 return;
2066 }
2067
ea73a9f2
JB		 2068 if (sdp->use_192_bytes_for_3f) {
2069 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2070 } else {
2071 /*
2072 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2073 * We have to start carefully: some devices hang if we ask
2074 * for more than is available.
2075 */
ea73a9f2 2076 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2077
2078 /*
2079 * Second attempt: ask for page 0 When only page 0 is
2080 * implemented, a request for page 3F may return Sense Key
2081 * 5: Illegal Request, Sense Code 24: Invalid field in
2082 * CDB.
2083 */
2084 if (!scsi_status_is_good(res))
ea73a9f2 2085 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2086
2087 /*
2088 * Third attempt: ask 255 bytes, as we did earlier.
2089 */
2090 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2091 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2092 &data, NULL);
1da177e4
LT		 2093 }
2094
2095 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2096 sd_printk(KERN_WARNING, sdkp,
2097 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2098 } else {
2099 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2100 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2101 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2102 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2103 sdkp->write_prot ? "on" : "off");
2104 sd_printk(KERN_DEBUG, sdkp,
2105 "Mode Sense: %02x %02x %02x %02x\n",
2106 buffer[0], buffer[1], buffer[2], buffer[3]);
2107 }
1da177e4
LT		 2108 }
2109}
2110
2111/*
2112 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2113 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2114 */
2115static void
e73aec82 2116sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2117{
1da177e4 2118 int len = 0, res;
ea73a9f2 2119 struct scsi_device *sdp = sdkp->device;
1da177e4 2120
631e8a13
AV		 2121 int dbd;
2122 int modepage;
0bcaa111 2123 int first_len;
1da177e4
LT		 2124 struct scsi_mode_data data;
2125 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2126 int old_wce = sdkp->WCE;
2127 int old_rcd = sdkp->RCD;
2128 int old_dpofua = sdkp->DPOFUA;
1da177e4 2129
0bcaa111
LT		 2130 first_len = 4;
2131 if (sdp->skip_ms_page_8) {
2132 if (sdp->type == TYPE_RBC)
2133 goto defaults;
2134 else {
2135 if (sdp->skip_ms_page_3f)
2136 goto defaults;
2137 modepage = 0x3F;
2138 if (sdp->use_192_bytes_for_3f)
2139 first_len = 192;
2140 dbd = 0;
2141 }
2142 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2143 modepage = 6;
2144 dbd = 8;
2145 } else {
2146 modepage = 8;
2147 dbd = 0;
2148 }
2149
1da177e4 2150 /* cautiously ask */
0bcaa111
LT		 2151 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2152 &data, &sshdr);
1da177e4
LT		 2153
2154 if (!scsi_status_is_good(res))
2155 goto bad_sense;
2156
6d73c851
AV		 2157 if (!data.header_length) {
2158 modepage = 6;
0bcaa111 2159 first_len = 0;
e73aec82 2160 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2161 }
2162
1da177e4
LT		 2163 /* that went OK, now ask for the proper length */
2164 len = data.length;
2165
2166 /*
2167 * We're only interested in the first three bytes, actually.
2168 * But the data cache page is defined for the first 20.
2169 */
2170 if (len < 3)
2171 goto bad_sense;
0bcaa111
LT		 2172 else if (len > SD_BUF_SIZE) {
2173 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2174 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2175 len = SD_BUF_SIZE;
2176 }
2177 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2178 len = 192;
1da177e4
LT		 2179
2180 /* Get the data */
0bcaa111
LT		 2181 if (len > first_len)
2182 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2183 &data, &sshdr);
1da177e4
LT		 2184
2185 if (scsi_status_is_good(res)) {
631e8a13 2186 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2187
0bcaa111
LT		 2188 while (offset < len) {
2189 u8 page_code = buffer[offset] & 0x3F;
2190 u8 spf = buffer[offset] & 0x40;
2191
2192 if (page_code == 8 || page_code == 6) {
2193 /* We're interested only in the first 3 bytes.
2194 */
2195 if (len - offset <= 2) {
2196 sd_printk(KERN_ERR, sdkp, "Incomplete "
2197 "mode parameter data\n");
2198 goto defaults;
2199 } else {
2200 modepage = page_code;
2201 goto Page_found;
2202 }
2203 } else {
2204 /* Go to the next page */
2205 if (spf && len - offset > 3)
2206 offset += 4 + (buffer[offset+2] << 8) +
2207 buffer[offset+3];
2208 else if (!spf && len - offset > 1)
2209 offset += 2 + buffer[offset+1];
2210 else {
2211 sd_printk(KERN_ERR, sdkp, "Incomplete "
2212 "mode parameter data\n");
2213 goto defaults;
2214 }
2215 }
48970800
AV		 2216 }
2217
0bcaa111
LT		 2218 if (modepage == 0x3F) {
2219 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2220 "present\n");
2221 goto defaults;
2222 } else if ((buffer[offset] & 0x3f) != modepage) {
e73aec82 2223 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
631e8a13
AV		 2224 goto defaults;
2225 }
0bcaa111 2226 Page_found:
631e8a13
AV		 2227 if (modepage == 8) {
2228 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2229 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2230 } else {
2231 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2232 sdkp->RCD = 0;
2233 }
1da177e4 2234
007365ad
TH		 2235 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2236 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2237 sd_printk(KERN_NOTICE, sdkp,
2238 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2239 sdkp->DPOFUA = 0;
2240 }
2241
70a9b873
MP		 2242 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2243 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2244 sd_printk(KERN_NOTICE, sdkp,
2245 "Write cache: %s, read cache: %s, %s\n",
2246 sdkp->WCE ? "enabled" : "disabled",
2247 sdkp->RCD ? "disabled" : "enabled",
2248 sdkp->DPOFUA ? "supports DPO and FUA"
2249 : "doesn't support DPO or FUA");
1da177e4
LT		 2250
2251 return;
2252 }
2253
2254bad_sense:
ea73a9f2 2255 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2256 sshdr.sense_key == ILLEGAL_REQUEST &&
2257 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2258 /* Invalid field in CDB */
2259 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2260 else
e73aec82 2261 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2262
2263defaults:
b81478d8
NJ		 2264 if (sdp->wce_default_on) {
2265 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2266 sdkp->WCE = 1;
2267 } else {
2268 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2269 sdkp->WCE = 0;
2270 }
1da177e4 2271 sdkp->RCD = 0;
48970800 2272 sdkp->DPOFUA = 0;
1da177e4
LT		 2273}
2274
e0597d70
MP		 2275/*
2276 * The ATO bit indicates whether the DIF application tag is available
2277 * for use by the operating system.
2278 */
439d77f7 2279static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2280{
2281 int res, offset;
2282 struct scsi_device *sdp = sdkp->device;
2283 struct scsi_mode_data data;
2284 struct scsi_sense_hdr sshdr;
2285
2286 if (sdp->type != TYPE_DISK)
2287 return;
2288
2289 if (sdkp->protection_type == 0)
2290 return;
2291
2292 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2293 SD_MAX_RETRIES, &data, &sshdr);
2294
2295 if (!scsi_status_is_good(res) || !data.header_length ||
2296 data.length < 6) {
2297 sd_printk(KERN_WARNING, sdkp,
2298 "getting Control mode page failed, assume no ATO\n");
2299
2300 if (scsi_sense_valid(&sshdr))
2301 sd_print_sense_hdr(sdkp, &sshdr);
2302
2303 return;
2304 }
2305
2306 offset = data.header_length + data.block_descriptor_length;
2307
2308 if ((buffer[offset] & 0x3f) != 0x0a) {
2309 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2310 return;
2311 }
2312
2313 if ((buffer[offset + 5] & 0x80) == 0)
2314 return;
2315
2316 sdkp->ATO = 1;
2317
2318 return;
2319}
2320
d11b6916
MP		 2321/**
2322 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2323 * @disk: disk to query
2324 */
2325static void sd_read_block_limits(struct scsi_disk *sdkp)
2326{
2327 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2328 const int vpd_len = 64;
e3deec09 2329 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2330
e3deec09
JB		 2331 if (!buffer ||
2332 /* Block Limits VPD */
2333 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2334 goto out;
d11b6916
MP		 2335
2336 blk_queue_io_min(sdkp->disk->queue,
2337 get_unaligned_be16(&buffer[6]) * sector_sz);
2338 blk_queue_io_opt(sdkp->disk->queue,
2339 get_unaligned_be32(&buffer[12]) * sector_sz);
2340
c98a0eb0
MP		 2341 if (buffer[3] == 0x3c) {
2342 unsigned int lba_count, desc_count;
e339c1a7 2343
c98a0eb0
MP		 2344 sdkp->max_ws_blocks =
2345 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2346 (u64)0xffffffff);
e339c1a7 2347
c98a0eb0 2348 if (!sdkp->lbpme)
045d3fe7 2349 goto out;
045d3fe7 2350
c98a0eb0
MP		 2351 lba_count = get_unaligned_be32(&buffer[20]);
2352 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2353
c98a0eb0
MP		 2354 if (lba_count && desc_count)
2355 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2356
c98a0eb0 2357 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2358
2359 if (buffer[32] & 0x80)
c98a0eb0 2360 sdkp->unmap_alignment =
e339c1a7 2361 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2362
2363 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2364
2365 if (sdkp->max_unmap_blocks)
2366 sd_config_discard(sdkp, SD_LBP_UNMAP);
2367 else
2368 sd_config_discard(sdkp, SD_LBP_WS16);
2369
2370 } else { /* LBP VPD page tells us what to use */
2371
2372 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2373 sd_config_discard(sdkp, SD_LBP_UNMAP);
2374 else if (sdkp->lbpws)
2375 sd_config_discard(sdkp, SD_LBP_WS16);
2376 else if (sdkp->lbpws10)
2377 sd_config_discard(sdkp, SD_LBP_WS10);
2378 else
2379 sd_config_discard(sdkp, SD_LBP_DISABLE);
2380 }
e339c1a7
MP		 2381 }
2382
e3deec09 2383 out:
d11b6916
MP		 2384 kfree(buffer);
2385}
2386
3821d768
MP		 2387/**
2388 * sd_read_block_characteristics - Query block dev. characteristics
2389 * @disk: disk to query
2390 */
2391static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2392{
e3deec09 2393 unsigned char *buffer;
3821d768 2394 u16 rot;
bb2d3de1 2395 const int vpd_len = 64;
3821d768 2396
e3deec09 2397 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2398
e3deec09
JB		 2399 if (!buffer ||
2400 /* Block Device Characteristics VPD */
2401 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2402 goto out;
3821d768
MP		 2403
2404 rot = get_unaligned_be16(&buffer[4]);
2405
2406 if (rot == 1)
2407 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2408
e3deec09 2409 out:
3821d768
MP		 2410 kfree(buffer);
2411}
2412
045d3fe7 2413/**
c98a0eb0 2414 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2415 * @disk: disk to query
2416 */
c98a0eb0 2417static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2418{
2419 unsigned char *buffer;
2420 const int vpd_len = 8;
2421
c98a0eb0 2422 if (sdkp->lbpme == 0)
045d3fe7
MP		 2423 return;
2424
2425 buffer = kmalloc(vpd_len, GFP_KERNEL);
2426
2427 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2428 goto out;
2429
c98a0eb0
MP		 2430 sdkp->lbpvpd = 1;
2431 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2432 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2433 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2434
2435 out:
2436 kfree(buffer);
2437}
2438
ffd4bc2a
MP		 2439static int sd_try_extended_inquiry(struct scsi_device *sdp)
2440{
2441 /*
2442 * Although VPD inquiries can go to SCSI-2 type devices,
2443 * some USB ones crash on receiving them, and the pages
2444 * we currently ask for are for SPC-3 and beyond
2445 */
09b6b51b 2446 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2447 return 1;
2448 return 0;
2449}
2450
1da177e4
LT		 2451/**
2452 * sd_revalidate_disk - called the first time a new disk is seen,
2453 * performs disk spin up, read_capacity, etc.
2454 * @disk: struct gendisk we care about
2455 **/
2456static int sd_revalidate_disk(struct gendisk *disk)
2457{
2458 struct scsi_disk *sdkp = scsi_disk(disk);
2459 struct scsi_device *sdp = sdkp->device;
1da177e4 2460 unsigned char *buffer;
4913efe4 2461 unsigned flush = 0;
1da177e4 2462
fa0d34be
MP		 2463 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2464 "sd_revalidate_disk\n"));
1da177e4
LT		 2465
2466 /*
2467 * If the device is offline, don't try and read capacity or any
2468 * of the other niceties.
2469 */
2470 if (!scsi_device_online(sdp))
2471 goto out;
2472
a6123f14 2473 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2474 if (!buffer) {
e73aec82
MP		 2475 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2476 "allocation failure.\n");
ea73a9f2 2477 goto out;
1da177e4
LT		 2478 }
2479
e73aec82 2480 sd_spinup_disk(sdkp);
1da177e4
LT		 2481
2482 /*
2483 * Without media there is no reason to ask; moreover, some devices
2484 * react badly if we do.
2485 */
2486 if (sdkp->media_present) {
e73aec82 2487 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2488
2489 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2490 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2491 sd_read_block_limits(sdkp);
2492 sd_read_block_characteristics(sdkp);
2493 }
2494
e73aec82
MP		 2495 sd_read_write_protect_flag(sdkp, buffer);
2496 sd_read_cache_type(sdkp, buffer);
e0597d70 2497 sd_read_app_tag_own(sdkp, buffer);
1da177e4 2498 }
461d4e90 2499
70a9b873
MP		 2500 sdkp->first_scan = 0;
2501
461d4e90
TH		 2502 /*
2503 * We now have all cache related info, determine how we deal
4913efe4 2504 * with flush requests.
461d4e90 2505 */
4913efe4
TH		 2506 if (sdkp->WCE) {
2507 flush |= REQ_FLUSH;
2508 if (sdkp->DPOFUA)
2509 flush |= REQ_FUA;
2510 }
461d4e90 2511
4913efe4 2512 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2513
1da177e4
LT		 2514 set_capacity(disk, sdkp->capacity);
2515 kfree(buffer);
2516
1da177e4
LT		 2517 out:
2518 return 0;
2519}
2520
72ec24bd
TH		 2521/**
2522 * sd_unlock_native_capacity - unlock native capacity
2523 * @disk: struct gendisk to set capacity for
2524 *
2525 * Block layer calls this function if it detects that partitions
2526 * on @disk reach beyond the end of the device. If the SCSI host
2527 * implements ->unlock_native_capacity() method, it's invoked to
2528 * give it a chance to adjust the device capacity.
2529 *
2530 * CONTEXT:
2531 * Defined by block layer. Might sleep.
2532 */
2533static void sd_unlock_native_capacity(struct gendisk *disk)
2534{
2535 struct scsi_device *sdev = scsi_disk(disk)->device;
2536
2537 if (sdev->host->hostt->unlock_native_capacity)
2538 sdev->host->hostt->unlock_native_capacity(sdev);
2539}
2540
3e1a7ff8
TH		 2541/**
2542 * sd_format_disk_name - format disk name
2543 * @prefix: name prefix - ie. "sd" for SCSI disks
2544 * @index: index of the disk to format name for
2545 * @buf: output buffer
2546 * @buflen: length of the output buffer
2547 *
2548 * SCSI disk names starts at sda. The 26th device is sdz and the
2549 * 27th is sdaa. The last one for two lettered suffix is sdzz
2550 * which is followed by sdaaa.
2551 *
2552 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2553 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2554 * determined using similar method as 26 base conversion with the
2555 * index shifted -1 after each digit is computed.
2556 *
2557 * CONTEXT:
2558 * Don't care.
2559 *
2560 * RETURNS:
2561 * 0 on success, -errno on failure.
2562 */
2563static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2564{
2565 const int base = 'z' - 'a' + 1;
2566 char *begin = buf + strlen(prefix);
2567 char *end = buf + buflen;
2568 char *p;
2569 int unit;
2570
2571 p = end - 1;
2572 *p = '\0';
2573 unit = base;
2574 do {
2575 if (p == begin)
2576 return -EINVAL;
2577 *--p = 'a' + (index % unit);
2578 index = (index / unit) - 1;
2579 } while (index >= 0);
2580
2581 memmove(begin, p, end - p);
2582 memcpy(buf, prefix, strlen(prefix));
2583
2584 return 0;
2585}
2586
4ace92fc
AV		 2587/*
2588 * The asynchronous part of sd_probe
2589 */
2590static void sd_probe_async(void *data, async_cookie_t cookie)
2591{
2592 struct scsi_disk *sdkp = data;
2593 struct scsi_device *sdp;
2594 struct gendisk *gd;
2595 u32 index;
2596 struct device *dev;
2597
2598 sdp = sdkp->device;
2599 gd = sdkp->disk;
2600 index = sdkp->index;
2601 dev = &sdp->sdev_gendev;
2602
1a03ae0f
MR		 2603 gd->major = sd_major((index & 0xf0) >> 4);
2604 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2605 gd->minors = SD_MINORS;
2606
4ace92fc
AV		 2607 gd->fops = &sd_fops;
2608 gd->private_data = &sdkp->driver;
2609 gd->queue = sdkp->device->request_queue;
2610
70a9b873
MP		 2611 /* defaults, until the device tells us otherwise */
2612 sdp->sector_size = 512;
2613 sdkp->capacity = 0;
2614 sdkp->media_present = 1;
2615 sdkp->write_prot = 0;
2616 sdkp->WCE = 0;
2617 sdkp->RCD = 0;
2618 sdkp->ATO = 0;
2619 sdkp->first_scan = 1;
18a4d0a2 2620 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2621
4ace92fc
AV		 2622 sd_revalidate_disk(gd);
2623
2624 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2625 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2626
2627 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2628 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2629 if (sdp->removable) {
4ace92fc 2630 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2631 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2632 }
4ace92fc 2633
4ace92fc
AV		 2634 add_disk(gd);
2635 sd_dif_config_host(sdkp);
2636
3821d768
MP		 2637 sd_revalidate_disk(gd);
2638
4ace92fc
AV		 2639 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2640 sdp->removable ? "removable " : "");
478a8a05 2641 scsi_autopm_put_device(sdp);
ea038f63 2642 put_device(&sdkp->dev);
4ace92fc
AV		 2643}
2644
1da177e4
LT		 2645/**
2646 * sd_probe - called during driver initialization and whenever a
2647 * new scsi device is attached to the system. It is called once
2648 * for each scsi device (not just disks) present.
2649 * @dev: pointer to device object
2650 *
2651 * Returns 0 if successful (or not interested in this scsi device
2652 * (e.g. scanner)); 1 when there is an error.
2653 *
2654 * Note: this function is invoked from the scsi mid-level.
2655 * This function sets up the mapping between a given
2656 * <host,channel,id,lun> (found in sdp) and new device name
2657 * (e.g. /dev/sda). More precisely it is the block device major
2658 * and minor number that is chosen here.
2659 *
2db93ce8
PU		 2660 * Assume sd_probe is not re-entrant (for time being)
2661 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2662 **/
2663static int sd_probe(struct device *dev)
2664{
2665 struct scsi_device *sdp = to_scsi_device(dev);
2666 struct scsi_disk *sdkp;
2667 struct gendisk *gd;
439d77f7 2668 int index;
1da177e4
LT		 2669 int error;
2670
2671 error = -ENODEV;
631e8a13 2672 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2673 goto out;
2674
9ccfc756 2675 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2676 "sd_probe\n"));
1da177e4
LT		 2677
2678 error = -ENOMEM;
24669f75 2679 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2680 if (!sdkp)
2681 goto out;
2682
689d6fac 2683 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2684 if (!gd)
2685 goto out_free;
2686
f27bac27
TH		 2687 do {
2688 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2689 goto out_put;
1da177e4 2690
4034cc68 2691 spin_lock(&sd_index_lock);
f27bac27 2692 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2693 spin_unlock(&sd_index_lock);
f27bac27 2694 } while (error == -EAGAIN);
1da177e4 2695
21208ae5
DK		 2696 if (error) {
2697 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2698 goto out_put;
1a03ae0f
MR		 2699 }
2700
3e1a7ff8 2701 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2702 if (error) {
2703 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2704 goto out_free_index;
21208ae5 2705 }
f27bac27 2706
1da177e4
LT		 2707 sdkp->device = sdp;
2708 sdkp->driver = &sd_template;
2709 sdkp->disk = gd;
2710 sdkp->index = index;
409f3499 2711 atomic_set(&sdkp->openers, 0);
9e1a1537 2712 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2713
601e7638
JB		 2714 if (!sdp->request_queue->rq_timeout) {
2715 if (sdp->type != TYPE_MOD)
2716 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2717 else
2718 blk_queue_rq_timeout(sdp->request_queue,
2719 SD_MOD_TIMEOUT);
2720 }
2721
2722 device_initialize(&sdkp->dev);
478a8a05 2723 sdkp->dev.parent = dev;
601e7638 2724 sdkp->dev.class = &sd_disk_class;
478a8a05 2725 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2726
2727 if (device_add(&sdkp->dev))
2728 goto out_free_index;
2729
478a8a05
AS		 2730 get_device(dev);
2731 dev_set_drvdata(dev, sdkp);
601e7638 2732
ea038f63 2733 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2734 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2735
2736 return 0;
2737
f27bac27 2738 out_free_index:
4034cc68 2739 spin_lock(&sd_index_lock);
f27bac27 2740 ida_remove(&sd_index_ida, index);
4034cc68 2741 spin_unlock(&sd_index_lock);
6bdaa1f1 2742 out_put:
1da177e4 2743 put_disk(gd);
6bdaa1f1 2744 out_free:
1da177e4 2745 kfree(sdkp);
6bdaa1f1 2746 out:
1da177e4
LT		 2747 return error;
2748}
2749
2750/**
2751 * sd_remove - called whenever a scsi disk (previously recognized by
2752 * sd_probe) is detached from the system. It is called (potentially
2753 * multiple times) during sd module unload.
2754 * @sdp: pointer to mid level scsi device object
2755 *
2756 * Note: this function is invoked from the scsi mid-level.
2757 * This function potentially frees up a device name (e.g. /dev/sdc)
2758 * that could be re-used by a subsequent sd_probe().
2759 * This function is not called when the built-in sd driver is "exit-ed".
2760 **/
2761static int sd_remove(struct device *dev)
2762{
601e7638 2763 struct scsi_disk *sdkp;
1da177e4 2764
601e7638 2765 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 2766 scsi_autopm_get_device(sdkp->device);
2767
a7a20d10 2768 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 2769 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 2770 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 2771 device_del(&sdkp->dev);
1da177e4
LT		 2772 del_gendisk(sdkp->disk);
2773 sd_shutdown(dev);
39b7f1e2 2774
0b950672 2775 mutex_lock(&sd_ref_mutex);
39b7f1e2 2776 dev_set_drvdata(dev, NULL);
ee959b00 2777 put_device(&sdkp->dev);
0b950672 2778 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 2779
2780 return 0;
2781}
2782
2783/**
2784 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 2785 * @dev: pointer to embedded class device
1da177e4 2786 *
0b950672 2787 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 2788 * called on last put, you should always use the scsi_disk_get()
2789 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 2790 * and never do a direct put_device.
1da177e4 2791 **/
ee959b00 2792static void scsi_disk_release(struct device *dev)
1da177e4 2793{
ee959b00 2794 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 2795 struct gendisk *disk = sdkp->disk;
2796
4034cc68 2797 spin_lock(&sd_index_lock);
f27bac27 2798 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 2799 spin_unlock(&sd_index_lock);
1da177e4
LT		 2800
2801 disk->private_data = NULL;
1da177e4 2802 put_disk(disk);
39b7f1e2 2803 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 2804
2805 kfree(sdkp);
2806}
2807
cc5d2c8c 2808static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 2809{
2810 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2811 struct scsi_sense_hdr sshdr;
cc5d2c8c 2812 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 2813 int res;
2814
2815 if (start)
2816 cmd[4] |= 1; /* START */
2817
d2886ea3
SR		 2818 if (sdp->start_stop_pwr_cond)
2819 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2820
c3c94c5a
TH		 2821 if (!scsi_device_online(sdp))
2822 return -ENODEV;
2823
2824 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
f4f4e47e 2825 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
c3c94c5a 2826 if (res) {
cc5d2c8c
JB		 2827 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2828 sd_print_result(sdkp, res);
c3c94c5a 2829 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 2830 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 2831 }
2832
2833 return res;
2834}
2835
1da177e4
LT		 2836/*
2837 * Send a SYNCHRONIZE CACHE instruction down to the device through
2838 * the normal SCSI command structure. Wait for the command to
2839 * complete.
2840 */
2841static void sd_shutdown(struct device *dev)
2842{
39b7f1e2 2843 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 2844
2845 if (!sdkp)
2846 return; /* this can happen */
2847
54f57588
LM		 2848 if (pm_runtime_suspended(dev))
2849 goto exit;
2850
39b7f1e2 2851 if (sdkp->WCE) {
e73aec82
MP		 2852 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2853 sd_sync_cache(sdkp);
39b7f1e2 2854 }
c3c94c5a 2855
cc5d2c8c
JB		 2856 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2857 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2858 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2859 }
2860
54f57588 2861exit:
39b7f1e2
AS		 2862 scsi_disk_put(sdkp);
2863}
1da177e4 2864
c3c94c5a
TH		 2865static int sd_suspend(struct device *dev, pm_message_t mesg)
2866{
c3c94c5a 2867 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2868 int ret = 0;
c3c94c5a
TH		 2869
2870 if (!sdkp)
2871 return 0; /* this can happen */
2872
2873 if (sdkp->WCE) {
cc5d2c8c 2874 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 2875 ret = sd_sync_cache(sdkp);
2876 if (ret)
09ff92fe 2877 goto done;
c3c94c5a
TH		 2878 }
2879
3a2d5b70 2880 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 2881 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2882 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2883 }
2884
09ff92fe
AS		 2885done:
2886 scsi_disk_put(sdkp);
2887 return ret;
c3c94c5a
TH		 2888}
2889
2890static int sd_resume(struct device *dev)
2891{
c3c94c5a 2892 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2893 int ret = 0;
c3c94c5a 2894
cc5d2c8c 2895 if (!sdkp->device->manage_start_stop)
09ff92fe 2896 goto done;
c3c94c5a 2897
cc5d2c8c 2898 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 2899 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 2900
09ff92fe
AS		 2901done:
2902 scsi_disk_put(sdkp);
2903 return ret;
c3c94c5a
TH		 2904}
2905
1da177e4
LT		 2906/**
2907 * init_sd - entry point for this driver (both when built in or when
2908 * a module).
2909 *
2910 * Note: this function registers this driver with the scsi mid-level.
2911 **/
2912static int __init init_sd(void)
2913{
5e4009ba 2914 int majors = 0, i, err;
1da177e4
LT		 2915
2916 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2917
2918 for (i = 0; i < SD_MAJORS; i++)
2919 if (register_blkdev(sd_major(i), "sd") == 0)
2920 majors++;
2921
2922 if (!majors)
2923 return -ENODEV;
2924
5e4009ba
JG		 2925 err = class_register(&sd_disk_class);
2926 if (err)
2927 goto err_out;
6bdaa1f1 2928
5e4009ba
JG		 2929 err = scsi_register_driver(&sd_template.gendrv);
2930 if (err)
2931 goto err_out_class;
2932
4e7392ec
MP		 2933 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2934 0, 0, NULL);
2935 if (!sd_cdb_cache) {
2936 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2937 goto err_out_class;
2938 }
2939
2940 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2941 if (!sd_cdb_pool) {
2942 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2943 goto err_out_cache;
2944 }
2945
5e4009ba
JG		 2946 return 0;
2947
4e7392ec
MP		 2948err_out_cache:
2949 kmem_cache_destroy(sd_cdb_cache);
2950
5e4009ba
JG		 2951err_out_class:
2952 class_unregister(&sd_disk_class);
2953err_out:
2954 for (i = 0; i < SD_MAJORS; i++)
2955 unregister_blkdev(sd_major(i), "sd");
2956 return err;
1da177e4
LT		 2957}
2958
2959/**
2960 * exit_sd - exit point for this driver (when it is a module).
2961 *
2962 * Note: this function unregisters this driver from the scsi mid-level.
2963 **/
2964static void __exit exit_sd(void)
2965{
2966 int i;
2967
2968 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2969
4e7392ec
MP		 2970 mempool_destroy(sd_cdb_pool);
2971 kmem_cache_destroy(sd_cdb_cache);
2972
1da177e4 2973 scsi_unregister_driver(&sd_template.gendrv);
5e4009ba
JG		 2974 class_unregister(&sd_disk_class);
2975
1da177e4
LT		 2976 for (i = 0; i < SD_MAJORS; i++)
2977 unregister_blkdev(sd_major(i), "sd");
2978}
2979
1da177e4
LT		 2980module_init(init_sd);
2981module_exit(exit_sd);
e73aec82
MP		 2982
2983static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2984 struct scsi_sense_hdr *sshdr)
2985{
2e4c3329 2986 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 2987 scsi_show_sense_hdr(sshdr);
2e4c3329 2988 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 2989 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2990}
2991
2992static void sd_print_result(struct scsi_disk *sdkp, int result)
2993{
2e4c3329 2994 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 2995 scsi_show_result(result);
2996}
2997
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