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scsi: sd: Remove LBPRZ dependency for discards
[linux-2.6-block.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>
924d55b0 54#include <linux/pr.h>
8475c811 55#include <linux/t10-pi.h>
7c0f6ba6 56#include <linux/uaccess.h>
8f76d151 57#include <asm/unaligned.h>
1da177e4
LT		 58
59#include <scsi/scsi.h>
60#include <scsi/scsi_cmnd.h>
61#include <scsi/scsi_dbg.h>
62#include <scsi/scsi_device.h>
63#include <scsi/scsi_driver.h>
64#include <scsi/scsi_eh.h>
65#include <scsi/scsi_host.h>
66#include <scsi/scsi_ioctl.h>
1da177e4
LT		 67#include <scsi/scsicam.h>
68
aa91696e 69#include "sd.h"
a7a20d10 70#include "scsi_priv.h"
1da177e4
LT		 71#include "scsi_logging.h"
72
f018fa55
RH		 73MODULE_AUTHOR("Eric Youngdale");
74MODULE_DESCRIPTION("SCSI disk (sd) driver");
75MODULE_LICENSE("GPL");
76
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
92MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
d7b8bcb0
MT		 93MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
95MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
89d94756 96MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
f018fa55 97
870d6656 98#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
f615b48c 99#define SD_MINORS 16
870d6656 100#else
3e1a7ff8 101#define SD_MINORS 0
870d6656
TH		 102#endif
103
c98a0eb0 104static void sd_config_discard(struct scsi_disk *, unsigned int);
5db44863 105static void sd_config_write_same(struct scsi_disk *);
7b3d9545 106static int sd_revalidate_disk(struct gendisk *);
72ec24bd 107static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 108static int sd_probe(struct device *);
109static int sd_remove(struct device *);
110static void sd_shutdown(struct device *);
95897910
ON		 111static int sd_suspend_system(struct device *);
112static int sd_suspend_runtime(struct device *);
7b3d9545
LT		 113static int sd_resume(struct device *);
114static void sd_rescan(struct device *);
a1b73fc1
CH		 115static int sd_init_command(struct scsi_cmnd *SCpnt);
116static void sd_uninit_command(struct scsi_cmnd *SCpnt);
7b3d9545 117static int sd_done(struct scsi_cmnd *);
2451079b 118static int sd_eh_action(struct scsi_cmnd *, int);
7b3d9545 119static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 120static void scsi_disk_release(struct device *cdev);
7b3d9545 121static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
ef61329d 122static void sd_print_result(const struct scsi_disk *, const char *, int);
7b3d9545 123
4034cc68 124static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 125static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 126
127/* This semaphore is used to mediate the 0->1 reference get in the
128 * face of object destruction (i.e. we can't allow a get on an
129 * object after last put) */
0b950672 130static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 131
439d77f7
HS		 132static struct kmem_cache *sd_cdb_cache;
133static mempool_t *sd_cdb_pool;
4e7392ec 134
6bdaa1f1
JB		 135static const char *sd_cache_types[] = {
136 "write through", "none", "write back",
137 "write back, no read (daft)"
138};
139
cb2fb68d
VC		 140static void sd_set_flush_flag(struct scsi_disk *sdkp)
141{
eb310e23 142 bool wc = false, fua = false;
cb2fb68d
VC		 143
144 if (sdkp->WCE) {
eb310e23 145 wc = true;
cb2fb68d 146 if (sdkp->DPOFUA)
eb310e23 147 fua = true;
cb2fb68d
VC		 148 }
149
eb310e23 150 blk_queue_write_cache(sdkp->disk->queue, wc, fua);
cb2fb68d
VC		 151}
152
ee959b00 153static ssize_t
e1ea2351
GKH		 154cache_type_store(struct device *dev, struct device_attribute *attr,
155 const char *buf, size_t count)
6bdaa1f1
JB		 156{
157 int i, ct = -1, rcd, wce, sp;
ee959b00 158 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 159 struct scsi_device *sdp = sdkp->device;
160 char buffer[64];
161 char *buffer_data;
162 struct scsi_mode_data data;
163 struct scsi_sense_hdr sshdr;
2ee3e26c 164 static const char temp[] = "temporary ";
6bdaa1f1
JB		 165 int len;
166
89d94756 167 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
6bdaa1f1
JB		 168 /* no cache control on RBC devices; theoretically they
169 * can do it, but there's probably so many exceptions
170 * it's not worth the risk */
171 return -EINVAL;
172
39c60a09
JB		 173 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
174 buf += sizeof(temp) - 1;
175 sdkp->cache_override = 1;
176 } else {
177 sdkp->cache_override = 0;
178 }
179
6391a113 180 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 181 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 182 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
183 buf[len] == '\n') {
184 ct = i;
185 break;
186 }
187 }
188 if (ct < 0)
189 return -EINVAL;
190 rcd = ct & 0x01 ? 1 : 0;
2eefd57b 191 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
39c60a09
JB		 192
193 if (sdkp->cache_override) {
194 sdkp->WCE = wce;
195 sdkp->RCD = rcd;
cb2fb68d 196 sd_set_flush_flag(sdkp);
39c60a09
JB		 197 return count;
198 }
199
6bdaa1f1
JB		 200 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
201 SD_MAX_RETRIES, &data, NULL))
202 return -EINVAL;
a9312fb8 203 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 204 data.block_descriptor_length);
205 buffer_data = buffer + data.header_length +
206 data.block_descriptor_length;
207 buffer_data[2] &= ~0x05;
208 buffer_data[2] |= wce << 2 | rcd;
209 sp = buffer_data[0] & 0x80 ? 1 : 0;
2c5d16d6 210 buffer_data[0] &= ~0x80;
6bdaa1f1
JB		 211
212 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
213 SD_MAX_RETRIES, &data, &sshdr)) {
214 if (scsi_sense_valid(&sshdr))
e73aec82 215 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 216 return -EINVAL;
217 }
f98a8cae 218 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 219 return count;
220}
221
ee959b00 222static ssize_t
e1ea2351
GKH		 223manage_start_stop_show(struct device *dev, struct device_attribute *attr,
224 char *buf)
225{
226 struct scsi_disk *sdkp = to_scsi_disk(dev);
227 struct scsi_device *sdp = sdkp->device;
228
229 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
230}
231
232static ssize_t
233manage_start_stop_store(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
c3c94c5a 235{
ee959b00 236 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 237 struct scsi_device *sdp = sdkp->device;
238
239 if (!capable(CAP_SYS_ADMIN))
240 return -EACCES;
241
242 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
243
244 return count;
245}
e1ea2351 246static DEVICE_ATTR_RW(manage_start_stop);
c3c94c5a 247
ee959b00 248static ssize_t
e1ea2351
GKH		 249allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
250{
251 struct scsi_disk *sdkp = to_scsi_disk(dev);
252
253 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
254}
255
256static ssize_t
257allow_restart_store(struct device *dev, struct device_attribute *attr,
258 const char *buf, size_t count)
a144c5ae 259{
ee959b00 260 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 261 struct scsi_device *sdp = sdkp->device;
262
263 if (!capable(CAP_SYS_ADMIN))
264 return -EACCES;
265
89d94756 266 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
a144c5ae
BK		 267 return -EINVAL;
268
269 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
270
271 return count;
272}
e1ea2351 273static DEVICE_ATTR_RW(allow_restart);
a144c5ae 274
ee959b00 275static ssize_t
e1ea2351 276cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 277{
ee959b00 278 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 279 int ct = sdkp->RCD + 2*sdkp->WCE;
280
281 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
282}
e1ea2351 283static DEVICE_ATTR_RW(cache_type);
6bdaa1f1 284
ee959b00 285static ssize_t
e1ea2351 286FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 287{
ee959b00 288 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 289
290 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
291}
e1ea2351 292static DEVICE_ATTR_RO(FUA);
6bdaa1f1 293
ee959b00 294static ssize_t
e1ea2351
GKH		 295protection_type_show(struct device *dev, struct device_attribute *attr,
296 char *buf)
e0597d70
MP		 297{
298 struct scsi_disk *sdkp = to_scsi_disk(dev);
299
300 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
301}
302
8172499a 303static ssize_t
e1ea2351
GKH		 304protection_type_store(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t count)
8172499a
MP		 306{
307 struct scsi_disk *sdkp = to_scsi_disk(dev);
308 unsigned int val;
309 int err;
310
311 if (!capable(CAP_SYS_ADMIN))
312 return -EACCES;
313
314 err = kstrtouint(buf, 10, &val);
315
316 if (err)
317 return err;
318
8475c811 319 if (val >= 0 && val <= T10_PI_TYPE3_PROTECTION)
8172499a
MP		 320 sdkp->protection_type = val;
321
322 return count;
323}
e1ea2351 324static DEVICE_ATTR_RW(protection_type);
8172499a 325
518fa8e3 326static ssize_t
e1ea2351
GKH		 327protection_mode_show(struct device *dev, struct device_attribute *attr,
328 char *buf)
518fa8e3
MP		 329{
330 struct scsi_disk *sdkp = to_scsi_disk(dev);
331 struct scsi_device *sdp = sdkp->device;
332 unsigned int dif, dix;
333
334 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
335 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
336
8475c811 337 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
518fa8e3
MP		 338 dif = 0;
339 dix = 1;
340 }
341
342 if (!dif && !dix)
343 return snprintf(buf, 20, "none\n");
344
345 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
346}
e1ea2351 347static DEVICE_ATTR_RO(protection_mode);
518fa8e3 348
e0597d70 349static ssize_t
e1ea2351 350app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
e0597d70
MP		 351{
352 struct scsi_disk *sdkp = to_scsi_disk(dev);
353
354 return snprintf(buf, 20, "%u\n", sdkp->ATO);
355}
e1ea2351 356static DEVICE_ATTR_RO(app_tag_own);
e0597d70 357
e339c1a7 358static ssize_t
e1ea2351
GKH		 359thin_provisioning_show(struct device *dev, struct device_attribute *attr,
360 char *buf)
e339c1a7
MP		 361{
362 struct scsi_disk *sdkp = to_scsi_disk(dev);
363
c98a0eb0
MP		 364 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
365}
e1ea2351 366static DEVICE_ATTR_RO(thin_provisioning);
c98a0eb0
MP		 367
368static const char *lbp_mode[] = {
369 [SD_LBP_FULL] = "full",
370 [SD_LBP_UNMAP] = "unmap",
371 [SD_LBP_WS16] = "writesame_16",
372 [SD_LBP_WS10] = "writesame_10",
373 [SD_LBP_ZERO] = "writesame_zero",
374 [SD_LBP_DISABLE] = "disabled",
375};
376
377static ssize_t
e1ea2351
GKH		 378provisioning_mode_show(struct device *dev, struct device_attribute *attr,
379 char *buf)
c98a0eb0
MP		 380{
381 struct scsi_disk *sdkp = to_scsi_disk(dev);
382
383 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
384}
385
386static ssize_t
e1ea2351
GKH		 387provisioning_mode_store(struct device *dev, struct device_attribute *attr,
388 const char *buf, size_t count)
c98a0eb0
MP		 389{
390 struct scsi_disk *sdkp = to_scsi_disk(dev);
391 struct scsi_device *sdp = sdkp->device;
392
393 if (!capable(CAP_SYS_ADMIN))
394 return -EACCES;
395
89d94756
HR		 396 if (sd_is_zoned(sdkp)) {
397 sd_config_discard(sdkp, SD_LBP_DISABLE);
398 return count;
399 }
400
c98a0eb0
MP		 401 if (sdp->type != TYPE_DISK)
402 return -EINVAL;
403
404 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
405 sd_config_discard(sdkp, SD_LBP_UNMAP);
406 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
407 sd_config_discard(sdkp, SD_LBP_WS16);
408 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
409 sd_config_discard(sdkp, SD_LBP_WS10);
410 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
411 sd_config_discard(sdkp, SD_LBP_ZERO);
412 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
413 sd_config_discard(sdkp, SD_LBP_DISABLE);
414 else
415 return -EINVAL;
416
417 return count;
e339c1a7 418}
e1ea2351 419static DEVICE_ATTR_RW(provisioning_mode);
e339c1a7 420
e6bd9312
MP		 421static const char *zeroing_mode[] = {
422 [SD_ZERO_WRITE] = "write",
423 [SD_ZERO_WS] = "writesame",
424 [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap",
425 [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap",
426};
427
428static ssize_t
429zeroing_mode_show(struct device *dev, struct device_attribute *attr,
430 char *buf)
431{
432 struct scsi_disk *sdkp = to_scsi_disk(dev);
433
434 return snprintf(buf, 20, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
435}
436
437static ssize_t
438zeroing_mode_store(struct device *dev, struct device_attribute *attr,
439 const char *buf, size_t count)
440{
441 struct scsi_disk *sdkp = to_scsi_disk(dev);
442
443 if (!capable(CAP_SYS_ADMIN))
444 return -EACCES;
445
446 if (!strncmp(buf, zeroing_mode[SD_ZERO_WRITE], 20))
447 sdkp->zeroing_mode = SD_ZERO_WRITE;
448 else if (!strncmp(buf, zeroing_mode[SD_ZERO_WS], 20))
449 sdkp->zeroing_mode = SD_ZERO_WS;
450 else if (!strncmp(buf, zeroing_mode[SD_ZERO_WS16_UNMAP], 20))
451 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
452 else if (!strncmp(buf, zeroing_mode[SD_ZERO_WS10_UNMAP], 20))
453 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
454 else
455 return -EINVAL;
456
457 return count;
458}
459static DEVICE_ATTR_RW(zeroing_mode);
460
18a4d0a2 461static ssize_t
e1ea2351
GKH		 462max_medium_access_timeouts_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
18a4d0a2
MP		 464{
465 struct scsi_disk *sdkp = to_scsi_disk(dev);
466
467 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
468}
469
470static ssize_t
e1ea2351
GKH		 471max_medium_access_timeouts_store(struct device *dev,
472 struct device_attribute *attr, const char *buf,
473 size_t count)
18a4d0a2
MP		 474{
475 struct scsi_disk *sdkp = to_scsi_disk(dev);
476 int err;
477
478 if (!capable(CAP_SYS_ADMIN))
479 return -EACCES;
480
481 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
482
483 return err ? err : count;
484}
e1ea2351 485static DEVICE_ATTR_RW(max_medium_access_timeouts);
18a4d0a2 486
5db44863 487static ssize_t
e1ea2351
GKH		 488max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
489 char *buf)
5db44863
MP		 490{
491 struct scsi_disk *sdkp = to_scsi_disk(dev);
492
493 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
494}
495
496static ssize_t
e1ea2351
GKH		 497max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
498 const char *buf, size_t count)
5db44863
MP		 499{
500 struct scsi_disk *sdkp = to_scsi_disk(dev);
501 struct scsi_device *sdp = sdkp->device;
502 unsigned long max;
503 int err;
504
505 if (!capable(CAP_SYS_ADMIN))
506 return -EACCES;
507
89d94756 508 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
5db44863
MP		 509 return -EINVAL;
510
511 err = kstrtoul(buf, 10, &max);
512
513 if (err)
514 return err;
515
516 if (max == 0)
517 sdp->no_write_same = 1;
66c28f97
MP		 518 else if (max <= SD_MAX_WS16_BLOCKS) {
519 sdp->no_write_same = 0;
5db44863 520 sdkp->max_ws_blocks = max;
66c28f97 521 }
5db44863
MP		 522
523 sd_config_write_same(sdkp);
524
525 return count;
526}
e1ea2351
GKH		 527static DEVICE_ATTR_RW(max_write_same_blocks);
528
529static struct attribute *sd_disk_attrs[] = {
530 &dev_attr_cache_type.attr,
531 &dev_attr_FUA.attr,
532 &dev_attr_allow_restart.attr,
533 &dev_attr_manage_start_stop.attr,
534 &dev_attr_protection_type.attr,
535 &dev_attr_protection_mode.attr,
536 &dev_attr_app_tag_own.attr,
537 &dev_attr_thin_provisioning.attr,
538 &dev_attr_provisioning_mode.attr,
e6bd9312 539 &dev_attr_zeroing_mode.attr,
e1ea2351
GKH		 540 &dev_attr_max_write_same_blocks.attr,
541 &dev_attr_max_medium_access_timeouts.attr,
542 NULL,
6bdaa1f1 543};
e1ea2351 544ATTRIBUTE_GROUPS(sd_disk);
6bdaa1f1
JB		 545
546static struct class sd_disk_class = {
547 .name = "scsi_disk",
548 .owner = THIS_MODULE,
ee959b00 549 .dev_release = scsi_disk_release,
e1ea2351 550 .dev_groups = sd_disk_groups,
6bdaa1f1 551};
1da177e4 552
691e3d31 553static const struct dev_pm_ops sd_pm_ops = {
95897910 554 .suspend = sd_suspend_system,
691e3d31 555 .resume = sd_resume,
95897910 556 .poweroff = sd_suspend_system,
691e3d31 557 .restore = sd_resume,
95897910 558 .runtime_suspend = sd_suspend_runtime,
691e3d31
AL		 559 .runtime_resume = sd_resume,
560};
561
1da177e4 562static struct scsi_driver sd_template = {
1da177e4
LT		 563 .gendrv = {
564 .name = "sd",
3af6b352 565 .owner = THIS_MODULE,
1da177e4
LT		 566 .probe = sd_probe,
567 .remove = sd_remove,
568 .shutdown = sd_shutdown,
691e3d31 569 .pm = &sd_pm_ops,
1da177e4
LT		 570 },
571 .rescan = sd_rescan,
a1b73fc1
CH		 572 .init_command = sd_init_command,
573 .uninit_command = sd_uninit_command,
7b3d9545 574 .done = sd_done,
18a4d0a2 575 .eh_action = sd_eh_action,
1da177e4
LT		 576};
577
0761df9c
HR		 578/*
579 * Dummy kobj_map->probe function.
580 * The default ->probe function will call modprobe, which is
581 * pointless as this module is already loaded.
582 */
583static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
584{
585 return NULL;
586}
587
1da177e4
LT		 588/*
589 * Device no to disk mapping:
590 *
591 * major disc2 disc p1
592 * |............|.............|....|....| <- dev_t
593 * 31 20 19 8 7 4 3 0
594 *
595 * Inside a major, we have 16k disks, however mapped non-
596 * contiguously. The first 16 disks are for major0, the next
597 * ones with major1, ... Disk 256 is for major0 again, disk 272
598 * for major1, ...
599 * As we stay compatible with our numbering scheme, we can reuse
600 * the well-know SCSI majors 8, 65--71, 136--143.
601 */
602static int sd_major(int major_idx)
603{
604 switch (major_idx) {
605 case 0:
606 return SCSI_DISK0_MAJOR;
607 case 1 ... 7:
608 return SCSI_DISK1_MAJOR + major_idx - 1;
609 case 8 ... 15:
610 return SCSI_DISK8_MAJOR + major_idx - 8;
611 default:
612 BUG();
613 return 0; /* shut up gcc */
614 }
615}
616
3d9a1f53 617static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 618{
619 struct scsi_disk *sdkp = NULL;
620
3d9a1f53
CH		 621 mutex_lock(&sd_ref_mutex);
622
39b7f1e2
AS		 623 if (disk->private_data) {
624 sdkp = scsi_disk(disk);
625 if (scsi_device_get(sdkp->device) == 0)
ee959b00 626 get_device(&sdkp->dev);
39b7f1e2
AS		 627 else
628 sdkp = NULL;
629 }
0b950672 630 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 631 return sdkp;
632}
633
634static void scsi_disk_put(struct scsi_disk *sdkp)
635{
636 struct scsi_device *sdev = sdkp->device;
637
0b950672 638 mutex_lock(&sd_ref_mutex);
ee959b00 639 put_device(&sdkp->dev);
1da177e4 640 scsi_device_put(sdev);
0b950672 641 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 642}
643
c611529e
MP		 644static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
645 unsigned int dix, unsigned int dif)
35e1a5d9 646{
c611529e
MP		 647 struct bio *bio = scmd->request->bio;
648 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
649 unsigned int protect = 0;
650
651 if (dix) { /* DIX Type 0, 1, 2, 3 */
652 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
653 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
654
655 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
656 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
657 }
658
8475c811 659 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
c611529e
MP		 660 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
661
662 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
663 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
664 }
665
666 if (dif) { /* DIX/DIF Type 1, 2, 3 */
667 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
668
669 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
670 protect = 3 << 5; /* Disable target PI checking */
671 else
672 protect = 1 << 5; /* Enable target PI checking */
35e1a5d9
MP		 673 }
674
675 scsi_set_prot_op(scmd, prot_op);
676 scsi_set_prot_type(scmd, dif);
c611529e
MP		 677 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
678
679 return protect;
35e1a5d9
MP		 680}
681
c98a0eb0
MP		 682static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
683{
684 struct request_queue *q = sdkp->disk->queue;
685 unsigned int logical_block_size = sdkp->device->sector_size;
686 unsigned int max_blocks = 0;
687
bcd069bb
MP		 688 q->limits.discard_alignment =
689 sdkp->unmap_alignment * logical_block_size;
690 q->limits.discard_granularity =
691 max(sdkp->physical_block_size,
692 sdkp->unmap_granularity * logical_block_size);
89730393
MP		 693 sdkp->provisioning_mode = mode;
694
c98a0eb0
MP		 695 switch (mode) {
696
697 case SD_LBP_DISABLE:
2bb4cd5c 698 blk_queue_max_discard_sectors(q, 0);
c98a0eb0
MP		 699 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
700 return;
701
702 case SD_LBP_UNMAP:
5db44863
MP		 703 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
704 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 705 break;
706
707 case SD_LBP_WS16:
5db44863
MP		 708 max_blocks = min_not_zero(sdkp->max_ws_blocks,
709 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 710 break;
711
712 case SD_LBP_WS10:
5db44863
MP		 713 max_blocks = min_not_zero(sdkp->max_ws_blocks,
714 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 715 break;
716
717 case SD_LBP_ZERO:
5db44863
MP		 718 max_blocks = min_not_zero(sdkp->max_ws_blocks,
719 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 720 break;
721 }
722
2bb4cd5c 723 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
c98a0eb0 724 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 725}
726
81d926e8 727static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
e339c1a7 728{
6a7b4398 729 struct scsi_device *sdp = cmd->device;
81d926e8
CH		 730 struct request *rq = cmd->request;
731 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
732 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
733 unsigned int data_len = 24;
c98a0eb0 734 char *buf;
e339c1a7 735
81d926e8
CH		 736 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
737 if (!rq->special_vec.bv_page)
66ac0280 738 return BLKPREP_DEFER;
81d926e8
CH		 739 rq->special_vec.bv_offset = 0;
740 rq->special_vec.bv_len = data_len;
741 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
66ac0280 742
81d926e8
CH		 743 cmd->cmd_len = 10;
744 cmd->cmnd[0] = UNMAP;
745 cmd->cmnd[8] = 24;
e339c1a7 746
81d926e8
CH		 747 buf = page_address(rq->special_vec.bv_page);
748 put_unaligned_be16(6 + 16, &buf[0]);
749 put_unaligned_be16(16, &buf[2]);
750 put_unaligned_be64(sector, &buf[8]);
751 put_unaligned_be32(nr_sectors, &buf[16]);
c98a0eb0 752
81d926e8
CH		 753 cmd->allowed = SD_MAX_RETRIES;
754 cmd->transfersize = data_len;
755 rq->timeout = SD_TIMEOUT;
756 scsi_req(rq)->resid_len = data_len;
66ac0280 757
81d926e8
CH		 758 return scsi_init_io(cmd);
759}
c98a0eb0 760
02d26103 761static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
81d926e8
CH		 762{
763 struct scsi_device *sdp = cmd->device;
764 struct request *rq = cmd->request;
765 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
766 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
767 u32 data_len = sdp->sector_size;
c98a0eb0 768
81d926e8
CH		 769 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
770 if (!rq->special_vec.bv_page)
771 return BLKPREP_DEFER;
772 rq->special_vec.bv_offset = 0;
773 rq->special_vec.bv_len = data_len;
774 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
c98a0eb0 775
81d926e8
CH		 776 cmd->cmd_len = 16;
777 cmd->cmnd[0] = WRITE_SAME_16;
02d26103
CH		 778 if (unmap)
779 cmd->cmnd[1] = 0x8; /* UNMAP */
81d926e8
CH		 780 put_unaligned_be64(sector, &cmd->cmnd[2]);
781 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
e339c1a7 782
81d926e8
CH		 783 cmd->allowed = SD_MAX_RETRIES;
784 cmd->transfersize = data_len;
02d26103 785 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
81d926e8 786 scsi_req(rq)->resid_len = data_len;
6a7b4398 787
81d926e8
CH		 788 return scsi_init_io(cmd);
789}
6a7b4398 790
81d926e8
CH		 791static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
792{
793 struct scsi_device *sdp = cmd->device;
794 struct request *rq = cmd->request;
795 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
796 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
797 u32 data_len = sdp->sector_size;
f9d03f96 798
81d926e8
CH		 799 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
800 if (!rq->special_vec.bv_page)
801 return BLKPREP_DEFER;
802 rq->special_vec.bv_offset = 0;
803 rq->special_vec.bv_len = data_len;
f9d03f96 804 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
c98a0eb0 805
81d926e8
CH		 806 cmd->cmd_len = 10;
807 cmd->cmnd[0] = WRITE_SAME;
808 if (unmap)
809 cmd->cmnd[1] = 0x8; /* UNMAP */
810 put_unaligned_be32(sector, &cmd->cmnd[2]);
811 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
812
813 cmd->allowed = SD_MAX_RETRIES;
814 cmd->transfersize = data_len;
02d26103 815 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
81d926e8
CH		 816 scsi_req(rq)->resid_len = data_len;
817
818 return scsi_init_io(cmd);
f1126e95
FT		 819}
820
02d26103
CH		 821static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
822{
823 struct request *rq = cmd->request;
824 struct scsi_device *sdp = cmd->device;
825 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
826 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
827 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
828
e4b87837 829 if (!(rq->cmd_flags & REQ_NOUNMAP)) {
e6bd9312
MP		 830 switch (sdkp->zeroing_mode) {
831 case SD_ZERO_WS16_UNMAP:
e4b87837 832 return sd_setup_write_same16_cmnd(cmd, true);
e6bd9312 833 case SD_ZERO_WS10_UNMAP:
e4b87837
CH		 834 return sd_setup_write_same10_cmnd(cmd, true);
835 }
836 }
837
02d26103
CH		 838 if (sdp->no_write_same)
839 return BLKPREP_INVALID;
840 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
841 return sd_setup_write_same16_cmnd(cmd, false);
842 return sd_setup_write_same10_cmnd(cmd, false);
843}
844
5db44863
MP		 845static void sd_config_write_same(struct scsi_disk *sdkp)
846{
847 struct request_queue *q = sdkp->disk->queue;
848 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 849
850 if (sdkp->device->no_write_same) {
851 sdkp->max_ws_blocks = 0;
852 goto out;
853 }
854
855 /* Some devices can not handle block counts above 0xffff despite
856 * supporting WRITE SAME(16). Consequently we default to 64k
857 * blocks per I/O unless the device explicitly advertises a
858 * bigger limit.
859 */
66c28f97
MP		 860 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
861 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
862 (u32)SD_MAX_WS16_BLOCKS);
863 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
864 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
865 (u32)SD_MAX_WS10_BLOCKS);
866 else {
867 sdkp->device->no_write_same = 1;
868 sdkp->max_ws_blocks = 0;
869 }
5db44863 870
e6bd9312
MP		 871 if (sdkp->lbprz && sdkp->lbpws)
872 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
873 else if (sdkp->lbprz && sdkp->lbpws10)
874 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
875 else if (sdkp->max_ws_blocks)
876 sdkp->zeroing_mode = SD_ZERO_WS;
877 else
878 sdkp->zeroing_mode = SD_ZERO_WRITE;
879
5db44863 880out:
66c28f97
MP		 881 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
882 (logical_block_size >> 9));
02d26103
CH		 883 blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
884 (logical_block_size >> 9));
5db44863
MP		 885}
886
887/**
888 * sd_setup_write_same_cmnd - write the same data to multiple blocks
59b1134c 889 * @cmd: command to prepare
5db44863
MP		 890 *
891 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
892 * preference indicated by target device.
893 **/
59b1134c 894static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
5db44863 895{
59b1134c
CH		 896 struct request *rq = cmd->request;
897 struct scsi_device *sdp = cmd->device;
5db44863
MP		 898 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
899 struct bio *bio = rq->bio;
900 sector_t sector = blk_rq_pos(rq);
901 unsigned int nr_sectors = blk_rq_sectors(rq);
08965c2e 902 unsigned int nr_bytes = blk_rq_bytes(rq);
5db44863
MP		 903 int ret;
904
905 if (sdkp->device->no_write_same)
0fb5b1fb 906 return BLKPREP_INVALID;
5db44863 907
a4ad39b1 908 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
5db44863 909
89d94756
HR		 910 if (sd_is_zoned(sdkp)) {
911 ret = sd_zbc_setup_write_cmnd(cmd);
912 if (ret != BLKPREP_OK)
913 return ret;
914 }
915
5db44863
MP		 916 sector >>= ilog2(sdp->sector_size) - 9;
917 nr_sectors >>= ilog2(sdp->sector_size) - 9;
918
5db44863 919 rq->timeout = SD_WRITE_SAME_TIMEOUT;
5db44863
MP		 920
921 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
59b1134c
CH		 922 cmd->cmd_len = 16;
923 cmd->cmnd[0] = WRITE_SAME_16;
924 put_unaligned_be64(sector, &cmd->cmnd[2]);
925 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
5db44863 926 } else {
59b1134c
CH		 927 cmd->cmd_len = 10;
928 cmd->cmnd[0] = WRITE_SAME;
929 put_unaligned_be32(sector, &cmd->cmnd[2]);
930 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
5db44863
MP		 931 }
932
59b1134c 933 cmd->transfersize = sdp->sector_size;
a25ee548 934 cmd->allowed = SD_MAX_RETRIES;
08965c2e
BVA		 935
936 /*
937 * For WRITE SAME the data transferred via the DATA OUT buffer is
938 * different from the amount of data actually written to the target.
939 *
940 * We set up __data_len to the amount of data transferred via the
941 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
942 * to transfer a single sector of data first, but then reset it to
943 * the amount of data to be written right after so that the I/O path
944 * knows how much to actually write.
945 */
946 rq->__data_len = sdp->sector_size;
947 ret = scsi_init_io(cmd);
948 rq->__data_len = nr_bytes;
949 return ret;
5db44863
MP		 950}
951
a118c6c1 952static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
90467c29 953{
a118c6c1
CH		 954 struct request *rq = cmd->request;
955
956 /* flush requests don't perform I/O, zero the S/G table */
957 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
90467c29 958
a118c6c1
CH		 959 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
960 cmd->cmd_len = 10;
961 cmd->transfersize = 0;
962 cmd->allowed = SD_MAX_RETRIES;
963
26b9fd8b 964 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
a118c6c1 965 return BLKPREP_OK;
90467c29
FT		 966}
967
87949eee 968static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1da177e4 969{
a1b73fc1
CH		 970 struct request *rq = SCpnt->request;
971 struct scsi_device *sdp = SCpnt->device;
776b23a0 972 struct gendisk *disk = rq->rq_disk;
89d94756 973 struct scsi_disk *sdkp = scsi_disk(disk);
83096ebf 974 sector_t block = blk_rq_pos(rq);
18351070 975 sector_t threshold;
83096ebf 976 unsigned int this_count = blk_rq_sectors(rq);
c611529e 977 unsigned int dif, dix;
89d94756 978 bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
c611529e 979 int ret;
4e7392ec 980 unsigned char protect;
7f9a6bc4 981
89d94756
HR		 982 if (zoned_write) {
983 ret = sd_zbc_setup_write_cmnd(SCpnt);
984 if (ret != BLKPREP_OK)
985 return ret;
986 }
987
3c356bde 988 ret = scsi_init_io(SCpnt);
7f9a6bc4
JB		 989 if (ret != BLKPREP_OK)
990 goto out;
991 SCpnt = rq->special;
992
993 /* from here on until we're complete, any goto out
994 * is used for a killable error condition */
995 ret = BLKPREP_KILL;
1da177e4 996
a1b73fc1
CH		 997 SCSI_LOG_HLQUEUE(1,
998 scmd_printk(KERN_INFO, SCpnt,
999 "%s: block=%llu, count=%d\n",
1000 __func__, (unsigned long long)block, this_count));
1da177e4
LT		 1001
1002 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 1003 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 1004 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 1005 "Finishing %u sectors\n",
1006 blk_rq_sectors(rq)));
fa0d34be
MP		 1007 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1008 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 1009 goto out;
1da177e4
LT		 1010 }
1011
1012 if (sdp->changed) {
1013 /*
1014 * quietly refuse to do anything to a changed disc until
1015 * the changed bit has been reset
1016 */
3ff5588d 1017 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 1018 goto out;
1da177e4 1019 }
7f9a6bc4 1020
a0899d4d 1021 /*
18351070
LT		 1022 * Some SD card readers can't handle multi-sector accesses which touch
1023 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 1024 */
18351070
LT		 1025 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1026 (sdp->sector_size / 512);
1027
1028 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1029 if (block < threshold) {
1030 /* Access up to the threshold but not beyond */
1031 this_count = threshold - block;
1032 } else {
1033 /* Access only a single hardware sector */
1034 this_count = sdp->sector_size / 512;
1035 }
1036 }
a0899d4d 1037
fa0d34be
MP		 1038 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1039 (unsigned long long)block));
1da177e4
LT		 1040
1041 /*
1042 * If we have a 1K hardware sectorsize, prevent access to single
1043 * 512 byte sectors. In theory we could handle this - in fact
1044 * the scsi cdrom driver must be able to handle this because
1045 * we typically use 1K blocksizes, and cdroms typically have
1046 * 2K hardware sectorsizes. Of course, things are simpler
1047 * with the cdrom, since it is read-only. For performance
1048 * reasons, the filesystems should be able to handle this
1049 * and not force the scsi disk driver to use bounce buffers
1050 * for this.
1051 */
1052 if (sdp->sector_size == 1024) {
83096ebf 1053 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 1054 scmd_printk(KERN_ERR, SCpnt,
1055 "Bad block number requested\n");
7f9a6bc4 1056 goto out;
1da177e4
LT		 1057 } else {
1058 block = block >> 1;
1059 this_count = this_count >> 1;
1060 }
1061 }
1062 if (sdp->sector_size == 2048) {
83096ebf 1063 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 1064 scmd_printk(KERN_ERR, SCpnt,
1065 "Bad block number requested\n");
7f9a6bc4 1066 goto out;
1da177e4
LT		 1067 } else {
1068 block = block >> 2;
1069 this_count = this_count >> 2;
1070 }
1071 }
1072 if (sdp->sector_size == 4096) {
83096ebf 1073 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 1074 scmd_printk(KERN_ERR, SCpnt,
1075 "Bad block number requested\n");
7f9a6bc4 1076 goto out;
1da177e4
LT		 1077 } else {
1078 block = block >> 3;
1079 this_count = this_count >> 3;
1080 }
1081 }
1082 if (rq_data_dir(rq) == WRITE) {
1da177e4 1083 SCpnt->cmnd[0] = WRITE_6;
af55ff67 1084
8c579ab6 1085 if (blk_integrity_rq(rq))
c611529e 1086 sd_dif_prepare(SCpnt);
af55ff67 1087
1da177e4
LT		 1088 } else if (rq_data_dir(rq) == READ) {
1089 SCpnt->cmnd[0] = READ_6;
1da177e4 1090 } else {
ef295ecf 1091 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
7f9a6bc4 1092 goto out;
1da177e4
LT		 1093 }
1094
fa0d34be 1095 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 1096 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1097 (rq_data_dir(rq) == WRITE) ?
1098 "writing" : "reading", this_count,
83096ebf 1099 blk_rq_sectors(rq)));
1da177e4 1100
c611529e
MP		 1101 dix = scsi_prot_sg_count(SCpnt);
1102 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1103
1104 if (dif || dix)
1105 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
af55ff67 1106 else
4e7392ec
MP		 1107 protect = 0;
1108
8475c811 1109 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
4e7392ec
MP		 1110 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1111
1112 if (unlikely(SCpnt->cmnd == NULL)) {
1113 ret = BLKPREP_DEFER;
1114 goto out;
1115 }
af55ff67 1116
4e7392ec
MP		 1117 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1118 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1119 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1120 SCpnt->cmnd[7] = 0x18;
1121 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1122 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1123
1124 /* LBA */
1125 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1126 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1127 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1128 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1129 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1130 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1131 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1132 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1133
1134 /* Expected Indirect LBA */
1135 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1136 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1137 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1138 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1139
1140 /* Transfer length */
1141 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1142 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1143 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1144 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
e430cbc8 1145 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1da177e4 1146 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1147 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1148 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1149 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1150 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1151 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1152 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1153 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1154 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1155 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1156 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1157 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1158 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1159 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1160 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1161 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1162 scsi_device_protection(SCpnt->device) ||
1da177e4 1163 SCpnt->device->use_10_for_rw) {
1da177e4 1164 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1165 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1166 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1167 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1168 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1169 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1170 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1171 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1172 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1173 } else {
33659ebb 1174 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1175 /*
1176 * This happens only if this drive failed
1177 * 10byte rw command with ILLEGAL_REQUEST
1178 * during operation and thus turned off
1179 * use_10_for_rw.
1180 */
e73aec82
MP		 1181 scmd_printk(KERN_ERR, SCpnt,
1182 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1183 goto out;
007365ad
TH		 1184 }
1185
1da177e4
LT		 1186 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1187 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1188 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1189 SCpnt->cmnd[4] = (unsigned char) this_count;
1190 SCpnt->cmnd[5] = 0;
1191 }
30b0c37b 1192 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4
LT		 1193
1194 /*
1195 * We shouldn't disconnect in the middle of a sector, so with a dumb
1196 * host adapter, it's safe to assume that we can at least transfer
1197 * this many bytes between each connect / disconnect.
1198 */
1199 SCpnt->transfersize = sdp->sector_size;
1200 SCpnt->underflow = this_count << 9;
1201 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1202
1da177e4
LT		 1203 /*
1204 * This indicates that the command is ready from our end to be
1205 * queued.
1206 */
7f9a6bc4
JB		 1207 ret = BLKPREP_OK;
1208 out:
89d94756
HR		 1209 if (zoned_write && ret != BLKPREP_OK)
1210 sd_zbc_cancel_write_cmnd(SCpnt);
1211
a1b73fc1 1212 return ret;
1da177e4
LT		 1213}
1214
87949eee
CH		 1215static int sd_init_command(struct scsi_cmnd *cmd)
1216{
1217 struct request *rq = cmd->request;
1218
c2df40df
MC		 1219 switch (req_op(rq)) {
1220 case REQ_OP_DISCARD:
81d926e8
CH		 1221 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1222 case SD_LBP_UNMAP:
1223 return sd_setup_unmap_cmnd(cmd);
1224 case SD_LBP_WS16:
02d26103 1225 return sd_setup_write_same16_cmnd(cmd, true);
81d926e8
CH		 1226 case SD_LBP_WS10:
1227 return sd_setup_write_same10_cmnd(cmd, true);
1228 case SD_LBP_ZERO:
1229 return sd_setup_write_same10_cmnd(cmd, false);
1230 default:
1231 return BLKPREP_INVALID;
1232 }
02d26103
CH		 1233 case REQ_OP_WRITE_ZEROES:
1234 return sd_setup_write_zeroes_cmnd(cmd);
c2df40df 1235 case REQ_OP_WRITE_SAME:
87949eee 1236 return sd_setup_write_same_cmnd(cmd);
3a5e02ce 1237 case REQ_OP_FLUSH:
87949eee 1238 return sd_setup_flush_cmnd(cmd);
c2df40df
MC		 1239 case REQ_OP_READ:
1240 case REQ_OP_WRITE:
87949eee 1241 return sd_setup_read_write_cmnd(cmd);
89d94756
HR		 1242 case REQ_OP_ZONE_REPORT:
1243 return sd_zbc_setup_report_cmnd(cmd);
1244 case REQ_OP_ZONE_RESET:
1245 return sd_zbc_setup_reset_cmnd(cmd);
c2df40df
MC		 1246 default:
1247 BUG();
1248 }
87949eee
CH		 1249}
1250
1251static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1252{
1253 struct request *rq = SCpnt->request;
1254
f9d03f96
CH		 1255 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1256 __free_page(rq->special_vec.bv_page);
87949eee 1257
82ed4db4 1258 if (SCpnt->cmnd != scsi_req(rq)->cmd) {
87949eee
CH		 1259 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1260 SCpnt->cmnd = NULL;
1261 SCpnt->cmd_len = 0;
1262 }
1263}
1264
1da177e4
LT		 1265/**
1266 * sd_open - open a scsi disk device
1267 * @inode: only i_rdev member may be used
1268 * @filp: only f_mode and f_flags may be used
1269 *
1270 * Returns 0 if successful. Returns a negated errno value in case
1271 * of error.
1272 *
1273 * Note: This can be called from a user context (e.g. fsck(1) )
1274 * or from within the kernel (e.g. as a result of a mount(1) ).
1275 * In the latter case @inode and @filp carry an abridged amount
1276 * of information as noted above.
409f3499
AB		 1277 *
1278 * Locking: called with bdev->bd_mutex held.
1da177e4 1279 **/
0338e291 1280static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1281{
0338e291 1282 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1283 struct scsi_device *sdev;
1284 int retval;
1285
0338e291 1286 if (!sdkp)
1da177e4
LT		 1287 return -ENXIO;
1288
fa0d34be 1289 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1290
1291 sdev = sdkp->device;
1292
1293 /*
1294 * If the device is in error recovery, wait until it is done.
1295 * If the device is offline, then disallow any access to it.
1296 */
1297 retval = -ENXIO;
1298 if (!scsi_block_when_processing_errors(sdev))
1299 goto error_out;
1300
1301 if (sdev->removable || sdkp->write_prot)
0338e291 1302 check_disk_change(bdev);
1da177e4
LT		 1303
1304 /*
1305 * If the drive is empty, just let the open fail.
1306 */
1307 retval = -ENOMEDIUM;
0338e291 1308 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1309 goto error_out;
1310
1311 /*
1312 * If the device has the write protect tab set, have the open fail
1313 * if the user expects to be able to write to the thing.
1314 */
1315 retval = -EROFS;
0338e291 1316 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1317 goto error_out;
1318
1319 /*
1320 * It is possible that the disk changing stuff resulted in
1321 * the device being taken offline. If this is the case,
1322 * report this to the user, and don't pretend that the
1323 * open actually succeeded.
1324 */
1325 retval = -ENXIO;
1326 if (!scsi_device_online(sdev))
1327 goto error_out;
1328
409f3499 1329 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1330 if (scsi_block_when_processing_errors(sdev))
1331 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1332 }
1333
1334 return 0;
1335
1336error_out:
1337 scsi_disk_put(sdkp);
1338 return retval;
1339}
1340
1341/**
1342 * sd_release - invoked when the (last) close(2) is called on this
1343 * scsi disk.
1344 * @inode: only i_rdev member may be used
1345 * @filp: only f_mode and f_flags may be used
1346 *
1347 * Returns 0.
1348 *
1349 * Note: may block (uninterruptible) if error recovery is underway
1350 * on this disk.
409f3499
AB		 1351 *
1352 * Locking: called with bdev->bd_mutex held.
1da177e4 1353 **/
db2a144b 1354static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1355{
1da177e4
LT		 1356 struct scsi_disk *sdkp = scsi_disk(disk);
1357 struct scsi_device *sdev = sdkp->device;
1358
56937f7b 1359 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1360
7e443312 1361 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1362 if (scsi_block_when_processing_errors(sdev))
1363 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1364 }
1365
1366 /*
1367 * XXX and what if there are packets in flight and this close()
1368 * XXX is followed by a "rmmod sd_mod"?
1369 */
478a8a05 1370
1da177e4 1371 scsi_disk_put(sdkp);
1da177e4
LT		 1372}
1373
a885c8c4 1374static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1375{
1376 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1377 struct scsi_device *sdp = sdkp->device;
1378 struct Scsi_Host *host = sdp->host;
f08bb1e0 1379 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1da177e4
LT		 1380 int diskinfo[4];
1381
1382 /* default to most commonly used values */
f08bb1e0
MP		 1383 diskinfo[0] = 0x40; /* 1 << 6 */
1384 diskinfo[1] = 0x20; /* 1 << 5 */
1385 diskinfo[2] = capacity >> 11;
1386
1da177e4
LT		 1387 /* override with calculated, extended default, or driver values */
1388 if (host->hostt->bios_param)
f08bb1e0 1389 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1da177e4 1390 else
f08bb1e0 1391 scsicam_bios_param(bdev, capacity, diskinfo);
1da177e4 1392
a885c8c4
CH		 1393 geo->heads = diskinfo[0];
1394 geo->sectors = diskinfo[1];
1395 geo->cylinders = diskinfo[2];
1da177e4
LT		 1396 return 0;
1397}
1398
1399/**
1400 * sd_ioctl - process an ioctl
1401 * @inode: only i_rdev/i_bdev members may be used
1402 * @filp: only f_mode and f_flags may be used
1403 * @cmd: ioctl command number
1404 * @arg: this is third argument given to ioctl(2) system call.
1405 * Often contains a pointer.
1406 *
25985edc 1407 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1408 * success as well). Returns a negated errno value in case of error.
1409 *
1410 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1411 * down in the scsi subsystem.
1da177e4 1412 **/
0338e291 1413static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1414 unsigned int cmd, unsigned long arg)
1415{
1da177e4 1416 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1417 struct scsi_disk *sdkp = scsi_disk(disk);
1418 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1419 void __user *p = (void __user *)arg;
1420 int error;
1421
fe2d1851
NN		 1422 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1423 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1424
0bfc96cb
PB		 1425 error = scsi_verify_blk_ioctl(bdev, cmd);
1426 if (error < 0)
1427 return error;
1428
1da177e4
LT		 1429 /*
1430 * If we are in the middle of error recovery, don't let anyone
1431 * else try and use this device. Also, if error recovery fails, it
1432 * may try and take the device offline, in which case all further
1433 * access to the device is prohibited.
1434 */
906d15fb
CH		 1435 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1436 (mode & FMODE_NDELAY) != 0);
1437 if (error)
8a6cfeb6 1438 goto out;
1da177e4 1439
1da177e4
LT		 1440 /*
1441 * Send SCSI addressing ioctls directly to mid level, send other
1442 * ioctls to block level and then onto mid level if they can't be
1443 * resolved.
1444 */
1445 switch (cmd) {
1446 case SCSI_IOCTL_GET_IDLUN:
1447 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1448 error = scsi_ioctl(sdp, cmd, p);
1449 break;
1da177e4 1450 default:
577ebb37 1451 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1452 if (error != -ENOTTY)
8a6cfeb6
AB		 1453 break;
1454 error = scsi_ioctl(sdp, cmd, p);
1455 break;
1da177e4 1456 }
8a6cfeb6 1457out:
8a6cfeb6 1458 return error;
1da177e4
LT		 1459}
1460
1461static void set_media_not_present(struct scsi_disk *sdkp)
1462{
2bae0093
TH		 1463 if (sdkp->media_present)
1464 sdkp->device->changed = 1;
1465
1466 if (sdkp->device->removable) {
1467 sdkp->media_present = 0;
1468 sdkp->capacity = 0;
1469 }
1470}
1471
1472static int media_not_present(struct scsi_disk *sdkp,
1473 struct scsi_sense_hdr *sshdr)
1474{
1475 if (!scsi_sense_valid(sshdr))
1476 return 0;
1477
1478 /* not invoked for commands that could return deferred errors */
1479 switch (sshdr->sense_key) {
1480 case UNIT_ATTENTION:
1481 case NOT_READY:
1482 /* medium not present */
1483 if (sshdr->asc == 0x3A) {
1484 set_media_not_present(sdkp);
1485 return 1;
1486 }
1487 }
1488 return 0;
1da177e4
LT		 1489}
1490
1491/**
2bae0093
TH		 1492 * sd_check_events - check media events
1493 * @disk: kernel device descriptor
1494 * @clearing: disk events currently being cleared
1da177e4 1495 *
2bae0093 1496 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1497 *
1498 * Note: this function is invoked from the block subsystem.
1499 **/
2bae0093 1500static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4 1501{
eb72d0bb
HR		 1502 struct scsi_disk *sdkp = scsi_disk_get(disk);
1503 struct scsi_device *sdp;
1da177e4
LT		 1504 int retval;
1505
eb72d0bb
HR		 1506 if (!sdkp)
1507 return 0;
1508
1509 sdp = sdkp->device;
2bae0093 1510 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1511
1512 /*
1513 * If the device is offline, don't send any commands - just pretend as
1514 * if the command failed. If the device ever comes back online, we
1515 * can deal with it then. It is only because of unrecoverable errors
1516 * that we would ever take a device offline in the first place.
1517 */
285e9670
KS		 1518 if (!scsi_device_online(sdp)) {
1519 set_media_not_present(sdkp);
285e9670
KS		 1520 goto out;
1521 }
1da177e4
LT		 1522
1523 /*
1524 * Using TEST_UNIT_READY enables differentiation between drive with
1525 * no cartridge loaded - NOT READY, drive with changed cartridge -
1526 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1527 *
1528 * Drives that auto spin down. eg iomega jaz 1G, will be started
1529 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1530 * sd_revalidate() is called.
1531 */
001aac25 1532 if (scsi_block_when_processing_errors(sdp)) {
6fa2b8f9
CH		 1533 struct scsi_sense_hdr sshdr = { 0, };
1534
001aac25 1535 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
6fa2b8f9 1536 &sshdr);
1da177e4 1537
6fa2b8f9
CH		 1538 /* failed to execute TUR, assume media not present */
1539 if (host_byte(retval)) {
1540 set_media_not_present(sdkp);
1541 goto out;
1542 }
1da177e4 1543
6fa2b8f9
CH		 1544 if (media_not_present(sdkp, &sshdr))
1545 goto out;
1546 }
2bae0093 1547
1da177e4
LT		 1548 /*
1549 * For removable scsi disk we have to recognise the presence
2bae0093 1550 * of a disk in the drive.
1da177e4 1551 */
2bae0093
TH		 1552 if (!sdkp->media_present)
1553 sdp->changed = 1;
1da177e4 1554 sdkp->media_present = 1;
285e9670 1555out:
3ff5588d 1556 /*
2bae0093 1557 * sdp->changed is set under the following conditions:
3ff5588d 1558 *
2bae0093
TH		 1559 * Medium present state has changed in either direction.
1560 * Device has indicated UNIT_ATTENTION.
3ff5588d 1561 */
2bae0093
TH		 1562 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1563 sdp->changed = 0;
eb72d0bb 1564 scsi_disk_put(sdkp);
1da177e4 1565 return retval;
1da177e4
LT		 1566}
1567
e73aec82 1568static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1569{
1da177e4 1570 int retries, res;
e73aec82 1571 struct scsi_device *sdp = sdkp->device;
7e660100
JB		 1572 const int timeout = sdp->request_queue->rq_timeout
1573 * SD_FLUSH_TIMEOUT_MULTIPLIER;
ea73a9f2 1574 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1575
1576 if (!scsi_device_online(sdp))
1577 return -ENODEV;
1578
1da177e4
LT		 1579 for (retries = 3; retries > 0; --retries) {
1580 unsigned char cmd[10] = { 0 };
1581
1582 cmd[0] = SYNCHRONIZE_CACHE;
1583 /*
1584 * Leave the rest of the command zero to indicate
1585 * flush everything.
1586 */
fcbfffe2
CH		 1587 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
1588 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
ea73a9f2 1589 if (res == 0)
1da177e4
LT		 1590 break;
1591 }
1592
e73aec82 1593 if (res) {
ef61329d 1594 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
95897910 1595
e73aec82
MP		 1596 if (driver_byte(res) & DRIVER_SENSE)
1597 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 1598 /* we need to evaluate the error return */
1599 if (scsi_sense_valid(&sshdr) &&
7aae5134
AS		 1600 (sshdr.asc == 0x3a || /* medium not present */
1601 sshdr.asc == 0x20)) /* invalid command */
95897910
ON		 1602 /* this is no error here */
1603 return 0;
1604
1605 switch (host_byte(res)) {
1606 /* ignore errors due to racing a disconnection */
1607 case DID_BAD_TARGET:
1608 case DID_NO_CONNECT:
1609 return 0;
1610 /* signal the upper layer it might try again */
1611 case DID_BUS_BUSY:
1612 case DID_IMM_RETRY:
1613 case DID_REQUEUE:
1614 case DID_SOFT_ERROR:
1615 return -EBUSY;
1616 default:
1617 return -EIO;
1618 }
1da177e4 1619 }
3721050a 1620 return 0;
1da177e4
LT		 1621}
1622
1da177e4
LT		 1623static void sd_rescan(struct device *dev)
1624{
3d9a1f53 1625 struct scsi_disk *sdkp = dev_get_drvdata(dev);
39b7f1e2 1626
3d9a1f53 1627 revalidate_disk(sdkp->disk);
1da177e4
LT		 1628}
1629
1630
1631#ifdef CONFIG_COMPAT
1632/*
1633 * This gets directly called from VFS. When the ioctl
1634 * is not recognized we go back to the other translation paths.
1635 */
0338e291
AV		 1636static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1637 unsigned int cmd, unsigned long arg)
1da177e4 1638{
0338e291 1639 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
21a9d4c9 1640 int error;
1da177e4 1641
21a9d4c9
CH		 1642 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1643 (mode & FMODE_NDELAY) != 0);
1644 if (error)
1645 return error;
1da177e4 1646
1da177e4
LT		 1647 /*
1648 * Let the static ioctl translation table take care of it.
1649 */
21a9d4c9
CH		 1650 if (!sdev->host->hostt->compat_ioctl)
1651 return -ENOIOCTLCMD;
1652 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1da177e4
LT		 1653}
1654#endif
1655
924d55b0
CH		 1656static char sd_pr_type(enum pr_type type)
1657{
1658 switch (type) {
1659 case PR_WRITE_EXCLUSIVE:
1660 return 0x01;
1661 case PR_EXCLUSIVE_ACCESS:
1662 return 0x03;
1663 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1664 return 0x05;
1665 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1666 return 0x06;
1667 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1668 return 0x07;
1669 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1670 return 0x08;
1671 default:
1672 return 0;
1673 }
1674};
1675
1676static int sd_pr_command(struct block_device *bdev, u8 sa,
1677 u64 key, u64 sa_key, u8 type, u8 flags)
1678{
1679 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1680 struct scsi_sense_hdr sshdr;
1681 int result;
1682 u8 cmd[16] = { 0, };
1683 u8 data[24] = { 0, };
1684
1685 cmd[0] = PERSISTENT_RESERVE_OUT;
1686 cmd[1] = sa;
1687 cmd[2] = type;
1688 put_unaligned_be32(sizeof(data), &cmd[5]);
1689
1690 put_unaligned_be64(key, &data[0]);
1691 put_unaligned_be64(sa_key, &data[8]);
1692 data[20] = flags;
1693
1694 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1695 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1696
1697 if ((driver_byte(result) & DRIVER_SENSE) &&
1698 (scsi_sense_valid(&sshdr))) {
1699 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1700 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1701 }
1702
1703 return result;
1704}
1705
1706static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1707 u32 flags)
1708{
1709 if (flags & ~PR_FL_IGNORE_KEY)
1710 return -EOPNOTSUPP;
1711 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1712 old_key, new_key, 0,
01f90dd9 1713 (1 << 0) /* APTPL */);
924d55b0
CH		 1714}
1715
1716static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1717 u32 flags)
1718{
1719 if (flags)
1720 return -EOPNOTSUPP;
1721 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1722}
1723
1724static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1725{
1726 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1727}
1728
1729static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1730 enum pr_type type, bool abort)
1731{
1732 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1733 sd_pr_type(type), 0);
1734}
1735
1736static int sd_pr_clear(struct block_device *bdev, u64 key)
1737{
1738 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1739}
1740
1741static const struct pr_ops sd_pr_ops = {
1742 .pr_register = sd_pr_register,
1743 .pr_reserve = sd_pr_reserve,
1744 .pr_release = sd_pr_release,
1745 .pr_preempt = sd_pr_preempt,
1746 .pr_clear = sd_pr_clear,
1747};
1748
83d5cde4 1749static const struct block_device_operations sd_fops = {
1da177e4 1750 .owner = THIS_MODULE,
0338e291
AV		 1751 .open = sd_open,
1752 .release = sd_release,
8a6cfeb6 1753 .ioctl = sd_ioctl,
a885c8c4 1754 .getgeo = sd_getgeo,
1da177e4 1755#ifdef CONFIG_COMPAT
0338e291 1756 .compat_ioctl = sd_compat_ioctl,
1da177e4 1757#endif
2bae0093 1758 .check_events = sd_check_events,
1da177e4 1759 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1760 .unlock_native_capacity = sd_unlock_native_capacity,
924d55b0 1761 .pr_ops = &sd_pr_ops,
1da177e4
LT		 1762};
1763
18a4d0a2
MP		 1764/**
1765 * sd_eh_action - error handling callback
1766 * @scmd: sd-issued command that has failed
18a4d0a2
MP		 1767 * @eh_disp: The recovery disposition suggested by the midlayer
1768 *
2451079b
JB		 1769 * This function is called by the SCSI midlayer upon completion of an
1770 * error test command (currently TEST UNIT READY). The result of sending
1771 * the eh command is passed in eh_disp. We're looking for devices that
1772 * fail medium access commands but are OK with non access commands like
1773 * test unit ready (so wrongly see the device as having a successful
1774 * recovery)
18a4d0a2 1775 **/
2451079b 1776static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
18a4d0a2
MP		 1777{
1778 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1779
1780 if (!scsi_device_online(scmd->device) ||
2451079b
JB		 1781 !scsi_medium_access_command(scmd) ||
1782 host_byte(scmd->result) != DID_TIME_OUT ||
1783 eh_disp != SUCCESS)
18a4d0a2
MP		 1784 return eh_disp;
1785
1786 /*
1787 * The device has timed out executing a medium access command.
1788 * However, the TEST UNIT READY command sent during error
1789 * handling completed successfully. Either the device is in the
1790 * process of recovering or has it suffered an internal failure
1791 * that prevents access to the storage medium.
1792 */
2451079b 1793 sdkp->medium_access_timed_out++;
18a4d0a2
MP		 1794
1795 /*
1796 * If the device keeps failing read/write commands but TEST UNIT
1797 * READY always completes successfully we assume that medium
1798 * access is no longer possible and take the device offline.
1799 */
1800 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1801 scmd_printk(KERN_ERR, scmd,
1802 "Medium access timeout failure. Offlining disk!\n");
1803 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1804
1805 return FAILED;
1806 }
1807
1808 return eh_disp;
1809}
1810
af55ff67
MP		 1811static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1812{
83096ebf
TH		 1813 u64 start_lba = blk_rq_pos(scmd->request);
1814 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
74856fbf 1815 u64 factor = scmd->device->sector_size / 512;
af55ff67
MP		 1816 u64 bad_lba;
1817 int info_valid;
a8733c7b
JB		 1818 /*
1819 * resid is optional but mostly filled in. When it's unused,
1820 * its value is zero, so we assume the whole buffer transferred
1821 */
1822 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1823 unsigned int good_bytes;
af55ff67 1824
af55ff67
MP		 1825 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1826 SCSI_SENSE_BUFFERSIZE,
1827 &bad_lba);
1828 if (!info_valid)
1829 return 0;
1830
1831 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1832 return 0;
1833
74856fbf
MH		 1834 /* be careful ... don't want any overflows */
1835 do_div(start_lba, factor);
1836 do_div(end_lba, factor);
af55ff67
MP		 1837
1838 /* The bad lba was reported incorrectly, we have no idea where
1839 * the error is.
1840 */
1841 if (bad_lba < start_lba || bad_lba >= end_lba)
1842 return 0;
1843
1844 /* This computation should always be done in terms of
1845 * the resolution of the device's medium.
1846 */
a8733c7b
JB		 1847 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1848 return min(good_bytes, transferred);
af55ff67
MP		 1849}
1850
1da177e4 1851/**
7b3d9545 1852 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1853 * driver has completed (successfully or otherwise) a scsi command.
1854 * @SCpnt: mid-level's per command structure.
1855 *
1856 * Note: potentially run from within an ISR. Must not block.
1857 **/
7b3d9545 1858static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1859{
1860 int result = SCpnt->result;
af55ff67 1861 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
c46f0917
DLM		 1862 unsigned int sector_size = SCpnt->device->sector_size;
1863 unsigned int resid;
1da177e4 1864 struct scsi_sense_hdr sshdr;
4e7392ec 1865 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1866 struct request *req = SCpnt->request;
1da177e4
LT		 1867 int sense_valid = 0;
1868 int sense_deferred = 0;
c98a0eb0 1869 unsigned char op = SCpnt->cmnd[0];
5db44863 1870 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1871
89d94756
HR		 1872 switch (req_op(req)) {
1873 case REQ_OP_DISCARD:
02d26103 1874 case REQ_OP_WRITE_ZEROES:
89d94756
HR		 1875 case REQ_OP_WRITE_SAME:
1876 case REQ_OP_ZONE_RESET:
26e85fcd
MP		 1877 if (!result) {
1878 good_bytes = blk_rq_bytes(req);
1879 scsi_set_resid(SCpnt, 0);
1880 } else {
1881 good_bytes = 0;
1882 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1883 }
89d94756
HR		 1884 break;
1885 case REQ_OP_ZONE_REPORT:
1886 if (!result) {
1887 good_bytes = scsi_bufflen(SCpnt)
1888 - scsi_get_resid(SCpnt);
1889 scsi_set_resid(SCpnt, 0);
1890 } else {
1891 good_bytes = 0;
1892 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1893 }
1894 break;
c46f0917
DLM		 1895 default:
1896 /*
1897 * In case of bogus fw or device, we could end up having
1898 * an unaligned partial completion. Check this here and force
1899 * alignment.
1900 */
1901 resid = scsi_get_resid(SCpnt);
1902 if (resid & (sector_size - 1)) {
1903 sd_printk(KERN_INFO, sdkp,
1904 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1905 resid, sector_size);
1906 resid = min(scsi_bufflen(SCpnt),
1907 round_up(resid, sector_size));
1908 scsi_set_resid(SCpnt, resid);
1909 }
26e85fcd 1910 }
6a32a8ae 1911
1da177e4
LT		 1912 if (result) {
1913 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1914 if (sense_valid)
1915 sense_deferred = scsi_sense_is_deferred(&sshdr);
1916 }
2a863ba8
DJ		 1917 sdkp->medium_access_timed_out = 0;
1918
03aba2f7
LT		 1919 if (driver_byte(result) != DRIVER_SENSE &&
1920 (!sense_valid || sense_deferred))
1921 goto out;
1922
1923 switch (sshdr.sense_key) {
1924 case HARDWARE_ERROR:
1925 case MEDIUM_ERROR:
af55ff67 1926 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1927 break;
1928 case RECOVERED_ERROR:
af55ff67
MP		 1929 good_bytes = scsi_bufflen(SCpnt);
1930 break;
10dab226
JW		 1931 case NO_SENSE:
1932 /* This indicates a false check condition, so ignore it. An
1933 * unknown amount of data was transferred so treat it as an
1934 * error.
1935 */
10dab226
JW		 1936 SCpnt->result = 0;
1937 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1938 break;
c98a0eb0
MP		 1939 case ABORTED_COMMAND:
1940 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1941 good_bytes = sd_completed_bytes(SCpnt);
1942 break;
1943 case ILLEGAL_REQUEST:
1944 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1945 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1946 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1947 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1948 switch (op) {
1949 case UNMAP:
1950 sd_config_discard(sdkp, SD_LBP_DISABLE);
1951 break;
1952 case WRITE_SAME_16:
1953 case WRITE_SAME:
1954 if (unmap)
1955 sd_config_discard(sdkp, SD_LBP_DISABLE);
1956 else {
1957 sdkp->device->no_write_same = 1;
1958 sd_config_write_same(sdkp);
1959
1960 good_bytes = 0;
1961 req->__data_len = blk_rq_bytes(req);
e8064021 1962 req->rq_flags |= RQF_QUIET;
5db44863
MP		 1963 }
1964 }
1965 }
03aba2f7
LT		 1966 break;
1967 default:
1968 break;
1da177e4 1969 }
89d94756 1970
03aba2f7 1971 out:
89d94756
HR		 1972 if (sd_is_zoned(sdkp))
1973 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
1974
ef61329d
HR		 1975 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1976 "sd_done: completed %d of %d bytes\n",
1977 good_bytes, scsi_bufflen(SCpnt)));
1978
af55ff67
MP		 1979 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1980 sd_dif_complete(SCpnt, good_bytes);
1981
7b3d9545 1982 return good_bytes;
1da177e4
LT		 1983}
1984
1da177e4
LT		 1985/*
1986 * spinup disk - called only in sd_revalidate_disk()
1987 */
1988static void
e73aec82 1989sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1990{
1da177e4 1991 unsigned char cmd[10];
4451e472 1992 unsigned long spintime_expire = 0;
1da177e4
LT		 1993 int retries, spintime;
1994 unsigned int the_result;
1995 struct scsi_sense_hdr sshdr;
1996 int sense_valid = 0;
1997
1998 spintime = 0;
1999
2000 /* Spin up drives, as required. Only do this at boot time */
2001 /* Spinup needs to be done for module loads too. */
2002 do {
2003 retries = 0;
2004
2005 do {
2006 cmd[0] = TEST_UNIT_READY;
2007 memset((void *) &cmd[1], 0, 9);
2008
ea73a9f2
JB		 2009 the_result = scsi_execute_req(sdkp->device, cmd,
2010 DMA_NONE, NULL, 0,
2011 &sshdr, SD_TIMEOUT,
f4f4e47e 2012 SD_MAX_RETRIES, NULL);
1da177e4 2013
b4d38e38
AS		 2014 /*
2015 * If the drive has indicated to us that it
2016 * doesn't have any media in it, don't bother
2017 * with any more polling.
2018 */
2019 if (media_not_present(sdkp, &sshdr))
2020 return;
2021
1da177e4 2022 if (the_result)
ea73a9f2 2023 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 2024 retries++;
2025 } while (retries < 3 &&
2026 (!scsi_status_is_good(the_result) ||
2027 ((driver_byte(the_result) & DRIVER_SENSE) &&
2028 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2029
1da177e4
LT		 2030 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
2031 /* no sense, TUR either succeeded or failed
2032 * with a status error */
e73aec82 2033 if(!spintime && !scsi_status_is_good(the_result)) {
ef61329d
HR		 2034 sd_print_result(sdkp, "Test Unit Ready failed",
2035 the_result);
e73aec82 2036 }
1da177e4
LT		 2037 break;
2038 }
ef61329d 2039
1da177e4
LT		 2040 /*
2041 * The device does not want the automatic start to be issued.
2042 */
33dd6f92 2043 if (sdkp->device->no_start_on_add)
1da177e4 2044 break;
1da177e4 2045
33dd6f92
MW		 2046 if (sense_valid && sshdr.sense_key == NOT_READY) {
2047 if (sshdr.asc == 4 && sshdr.ascq == 3)
2048 break; /* manual intervention required */
2049 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2050 break; /* standby */
2051 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2052 break; /* unavailable */
2053 /*
2054 * Issue command to spin up drive when not ready
2055 */
1da177e4 2056 if (!spintime) {
e73aec82 2057 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 2058 cmd[0] = START_STOP;
2059 cmd[1] = 1; /* Return immediately */
2060 memset((void *) &cmd[2], 0, 8);
2061 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 2062 if (sdkp->device->start_stop_pwr_cond)
2063 cmd[4] |= 1 << 4;
ea73a9f2
JB		 2064 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2065 NULL, 0, &sshdr,
f4f4e47e
FT		 2066 SD_TIMEOUT, SD_MAX_RETRIES,
2067 NULL);
4451e472
AS		 2068 spintime_expire = jiffies + 100 * HZ;
2069 spintime = 1;
1da177e4 2070 }
1da177e4
LT		 2071 /* Wait 1 second for next try */
2072 msleep(1000);
2073 printk(".");
4451e472
AS		 2074
2075 /*
2076 * Wait for USB flash devices with slow firmware.
2077 * Yes, this sense key/ASC combination shouldn't
2078 * occur here. It's characteristic of these devices.
2079 */
2080 } else if (sense_valid &&
2081 sshdr.sense_key == UNIT_ATTENTION &&
2082 sshdr.asc == 0x28) {
2083 if (!spintime) {
2084 spintime_expire = jiffies + 5 * HZ;
2085 spintime = 1;
2086 }
2087 /* Wait 1 second for next try */
2088 msleep(1000);
1da177e4
LT		 2089 } else {
2090 /* we don't understand the sense code, so it's
2091 * probably pointless to loop */
2092 if(!spintime) {
e73aec82
MP		 2093 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2094 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 2095 }
2096 break;
2097 }
2098
4451e472 2099 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 2100
2101 if (spintime) {
2102 if (scsi_status_is_good(the_result))
2103 printk("ready\n");
2104 else
2105 printk("not responding...\n");
2106 }
2107}
2108
e0597d70
MP		 2109/*
2110 * Determine whether disk supports Data Integrity Field.
2111 */
fe542396 2112static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2113{
2114 struct scsi_device *sdp = sdkp->device;
2115 u8 type;
fe542396 2116 int ret = 0;
e0597d70
MP		 2117
2118 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 2119 return ret;
35e1a5d9
MP		 2120
2121 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2122
8475c811 2123 if (type > T10_PI_TYPE3_PROTECTION)
fe542396
MP		 2124 ret = -ENODEV;
2125 else if (scsi_host_dif_capable(sdp->host, type))
2126 ret = 1;
2127
2128 if (sdkp->first_scan || type != sdkp->protection_type)
2129 switch (ret) {
2130 case -ENODEV:
2131 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2132 " protection type %u. Disabling disk!\n",
2133 type);
2134 break;
2135 case 1:
2136 sd_printk(KERN_NOTICE, sdkp,
2137 "Enabling DIF Type %u protection\n", type);
2138 break;
2139 case 0:
2140 sd_printk(KERN_NOTICE, sdkp,
2141 "Disabling DIF Type %u protection\n", type);
2142 break;
2143 }
e0597d70 2144
be922f47
MP		 2145 sdkp->protection_type = type;
2146
fe542396 2147 return ret;
e0597d70
MP		 2148}
2149
0da205e0
MW		 2150static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2151 struct scsi_sense_hdr *sshdr, int sense_valid,
2152 int the_result)
2153{
0da205e0
MW		 2154 if (driver_byte(the_result) & DRIVER_SENSE)
2155 sd_print_sense_hdr(sdkp, sshdr);
2156 else
2157 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2158
2159 /*
2160 * Set dirty bit for removable devices if not ready -
2161 * sometimes drives will not report this properly.
2162 */
2163 if (sdp->removable &&
2164 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 2165 set_media_not_present(sdkp);
0da205e0
MW		 2166
2167 /*
2168 * We used to set media_present to 0 here to indicate no media
2169 * in the drive, but some drives fail read capacity even with
2170 * media present, so we can't do that.
2171 */
2172 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2173}
2174
2175#define RC16_LEN 32
2176#if RC16_LEN > SD_BUF_SIZE
2177#error RC16_LEN must not be more than SD_BUF_SIZE
2178#endif
2179
3233ac19
JB		 2180#define READ_CAPACITY_RETRIES_ON_RESET 10
2181
0da205e0
MW		 2182static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2183 unsigned char *buffer)
ea73a9f2 2184{
1da177e4 2185 unsigned char cmd[16];
1da177e4
LT		 2186 struct scsi_sense_hdr sshdr;
2187 int sense_valid = 0;
0da205e0 2188 int the_result;
3233ac19 2189 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 2190 unsigned int alignment;
0da205e0
MW		 2191 unsigned long long lba;
2192 unsigned sector_size;
1da177e4 2193
5ce524bd
HG		 2194 if (sdp->no_read_capacity_16)
2195 return -EINVAL;
2196
1da177e4 2197 do {
0da205e0 2198 memset(cmd, 0, 16);
eb846d9f 2199 cmd[0] = SERVICE_ACTION_IN_16;
0da205e0
MW		 2200 cmd[1] = SAI_READ_CAPACITY_16;
2201 cmd[13] = RC16_LEN;
2202 memset(buffer, 0, RC16_LEN);
2203
ea73a9f2 2204 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 2205 buffer, RC16_LEN, &sshdr,
2206 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 2207
ea73a9f2 2208 if (media_not_present(sdkp, &sshdr))
0da205e0 2209 return -ENODEV;
1da177e4 2210
2b301307 2211 if (the_result) {
ea73a9f2 2212 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 2213 if (sense_valid &&
2214 sshdr.sense_key == ILLEGAL_REQUEST &&
2215 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2216 sshdr.ascq == 0x00)
2217 /* Invalid Command Operation Code or
2218 * Invalid Field in CDB, just retry
2219 * silently with RC10 */
2220 return -EINVAL;
3233ac19
JB		 2221 if (sense_valid &&
2222 sshdr.sense_key == UNIT_ATTENTION &&
2223 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2224 /* Device reset might occur several times,
2225 * give it one more chance */
2226 if (--reset_retries > 0)
2227 continue;
2b301307 2228 }
1da177e4
LT		 2229 retries--;
2230
2231 } while (the_result && retries);
2232
0da205e0 2233 if (the_result) {
ef61329d 2234 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
0da205e0
MW		 2235 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2236 return -EINVAL;
2237 }
e73aec82 2238
8f76d151
DH		 2239 sector_size = get_unaligned_be32(&buffer[8]);
2240 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2241
fe542396
MP		 2242 if (sd_read_protection_type(sdkp, buffer) < 0) {
2243 sdkp->capacity = 0;
2244 return -ENODEV;
2245 }
0da205e0
MW		 2246
2247 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2248 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2249 "kernel compiled with support for large block "
2250 "devices.\n");
2251 sdkp->capacity = 0;
2252 return -EOVERFLOW;
2253 }
2254
ea09bcc9 2255 /* Logical blocks per physical block exponent */
526f7c79 2256 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9 2257
89d94756
HR		 2258 /* RC basis */
2259 sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2260
ea09bcc9
MP		 2261 /* Lowest aligned logical block */
2262 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2263 blk_queue_alignment_offset(sdp->request_queue, alignment);
2264 if (alignment && sdkp->first_scan)
2265 sd_printk(KERN_NOTICE, sdkp,
2266 "physical block alignment offset: %u\n", alignment);
2267
c98a0eb0
MP		 2268 if (buffer[14] & 0x80) { /* LBPME */
2269 sdkp->lbpme = 1;
e339c1a7 2270
c98a0eb0
MP		 2271 if (buffer[14] & 0x40) /* LBPRZ */
2272 sdkp->lbprz = 1;
e339c1a7 2273
c98a0eb0 2274 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2275 }
2276
0da205e0
MW		 2277 sdkp->capacity = lba + 1;
2278 return sector_size;
2279}
2280
2281static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2282 unsigned char *buffer)
2283{
2284 unsigned char cmd[16];
2285 struct scsi_sense_hdr sshdr;
2286 int sense_valid = 0;
2287 int the_result;
3233ac19 2288 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2289 sector_t lba;
2290 unsigned sector_size;
2291
2292 do {
2293 cmd[0] = READ_CAPACITY;
2294 memset(&cmd[1], 0, 9);
2295 memset(buffer, 0, 8);
2296
2297 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2298 buffer, 8, &sshdr,
2299 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2300
2301 if (media_not_present(sdkp, &sshdr))
2302 return -ENODEV;
2303
3233ac19 2304 if (the_result) {
0da205e0 2305 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2306 if (sense_valid &&
2307 sshdr.sense_key == UNIT_ATTENTION &&
2308 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2309 /* Device reset might occur several times,
2310 * give it one more chance */
2311 if (--reset_retries > 0)
2312 continue;
2313 }
0da205e0
MW		 2314 retries--;
2315
2316 } while (the_result && retries);
2317
2318 if (the_result) {
ef61329d 2319 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
0da205e0
MW		 2320 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2321 return -EINVAL;
2322 }
2323
8f76d151
DH		 2324 sector_size = get_unaligned_be32(&buffer[4]);
2325 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2326
5ce524bd
HG		 2327 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2328 /* Some buggy (usb cardreader) devices return an lba of
2329 0xffffffff when the want to report a size of 0 (with
2330 which they really mean no media is present) */
2331 sdkp->capacity = 0;
5cc10350 2332 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2333 return sector_size;
2334 }
2335
0da205e0
MW		 2336 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2337 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2338 "kernel compiled with support for large block "
2339 "devices.\n");
2340 sdkp->capacity = 0;
2341 return -EOVERFLOW;
2342 }
2343
2344 sdkp->capacity = lba + 1;
526f7c79 2345 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2346 return sector_size;
2347}
2348
2b301307
MW		 2349static int sd_try_rc16_first(struct scsi_device *sdp)
2350{
f87146bb
HR		 2351 if (sdp->host->max_cmd_len < 16)
2352 return 0;
6a0bdffa
AS		 2353 if (sdp->try_rc_10_first)
2354 return 0;
2b301307
MW		 2355 if (sdp->scsi_level > SCSI_SPC_2)
2356 return 1;
2357 if (scsi_device_protection(sdp))
2358 return 1;
2359 return 0;
2360}
2361
0da205e0
MW		 2362/*
2363 * read disk capacity
2364 */
2365static void
2366sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2367{
2368 int sector_size;
2369 struct scsi_device *sdp = sdkp->device;
2370
2b301307 2371 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2372 sector_size = read_capacity_16(sdkp, sdp, buffer);
2373 if (sector_size == -EOVERFLOW)
1da177e4 2374 goto got_data;
2b301307
MW		 2375 if (sector_size == -ENODEV)
2376 return;
2377 if (sector_size < 0)
2378 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2379 if (sector_size < 0)
2380 return;
1da177e4 2381 } else {
0da205e0
MW		 2382 sector_size = read_capacity_10(sdkp, sdp, buffer);
2383 if (sector_size == -EOVERFLOW)
2384 goto got_data;
2385 if (sector_size < 0)
2386 return;
2387 if ((sizeof(sdkp->capacity) > 4) &&
2388 (sdkp->capacity > 0xffffffffULL)) {
2389 int old_sector_size = sector_size;
2390 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2391 "Trying to use READ CAPACITY(16).\n");
2392 sector_size = read_capacity_16(sdkp, sdp, buffer);
2393 if (sector_size < 0) {
2394 sd_printk(KERN_NOTICE, sdkp,
2395 "Using 0xffffffff as device size\n");
2396 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2397 sector_size = old_sector_size;
2398 goto got_data;
2399 }
2400 }
2401 }
1da177e4 2402
5c211caa
AS		 2403 /* Some devices are known to return the total number of blocks,
2404 * not the highest block number. Some devices have versions
2405 * which do this and others which do not. Some devices we might
2406 * suspect of doing this but we don't know for certain.
2407 *
2408 * If we know the reported capacity is wrong, decrement it. If
2409 * we can only guess, then assume the number of blocks is even
2410 * (usually true but not always) and err on the side of lowering
2411 * the capacity.
2412 */
2413 if (sdp->fix_capacity ||
2414 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2415 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2416 "from its reported value: %llu\n",
2417 (unsigned long long) sdkp->capacity);
1da177e4 2418 --sdkp->capacity;
61bf54b7
ON		 2419 }
2420
1da177e4
LT		 2421got_data:
2422 if (sector_size == 0) {
2423 sector_size = 512;
e73aec82
MP		 2424 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2425 "assuming 512.\n");
1da177e4
LT		 2426 }
2427
2428 if (sector_size != 512 &&
2429 sector_size != 1024 &&
2430 sector_size != 2048 &&
74856fbf 2431 sector_size != 4096) {
e73aec82
MP		 2432 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2433 sector_size);
1da177e4
LT		 2434 /*
2435 * The user might want to re-format the drive with
2436 * a supported sectorsize. Once this happens, it
2437 * would be relatively trivial to set the thing up.
2438 * For this reason, we leave the thing in the table.
2439 */
2440 sdkp->capacity = 0;
2441 /*
2442 * set a bogus sector size so the normal read/write
2443 * logic in the block layer will eventually refuse any
2444 * request on this device without tripping over power
2445 * of two sector size assumptions
2446 */
2447 sector_size = 512;
2448 }
e1defc4f 2449 blk_queue_logical_block_size(sdp->request_queue, sector_size);
89d94756
HR		 2450 blk_queue_physical_block_size(sdp->request_queue,
2451 sdkp->physical_block_size);
2452 sdkp->device->sector_size = sector_size;
7404ad3b 2453
89d94756
HR		 2454 if (sdkp->capacity > 0xffffffff)
2455 sdp->use_16_for_rw = 1;
1da177e4 2456
89d94756 2457}
1da177e4 2458
89d94756
HR		 2459/*
2460 * Print disk capacity
2461 */
2462static void
2463sd_print_capacity(struct scsi_disk *sdkp,
2464 sector_t old_capacity)
2465{
2466 int sector_size = sdkp->device->sector_size;
2467 char cap_str_2[10], cap_str_10[10];
ea09bcc9 2468
89d94756
HR		 2469 string_get_size(sdkp->capacity, sector_size,
2470 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2471 string_get_size(sdkp->capacity, sector_size,
2472 STRING_UNITS_10, cap_str_10,
2473 sizeof(cap_str_10));
1da177e4 2474
89d94756
HR		 2475 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2476 sd_printk(KERN_NOTICE, sdkp,
2477 "%llu %d-byte logical blocks: (%s/%s)\n",
2478 (unsigned long long)sdkp->capacity,
2479 sector_size, cap_str_10, cap_str_2);
53ad570b 2480
89d94756
HR		 2481 if (sdkp->physical_block_size != sector_size)
2482 sd_printk(KERN_NOTICE, sdkp,
2483 "%u-byte physical blocks\n",
2484 sdkp->physical_block_size);
2485
2486 sd_zbc_print_zones(sdkp);
2487 }
1da177e4
LT		 2488}
2489
2490/* called with buffer of length 512 */
2491static inline int
ea73a9f2
JB		 2492sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2493 unsigned char *buffer, int len, struct scsi_mode_data *data,
2494 struct scsi_sense_hdr *sshdr)
1da177e4 2495{
ea73a9f2 2496 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2497 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2498 sshdr);
1da177e4
LT		 2499}
2500
2501/*
2502 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2503 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2504 */
2505static void
e73aec82 2506sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2507{
1da177e4 2508 int res;
ea73a9f2 2509 struct scsi_device *sdp = sdkp->device;
1da177e4 2510 struct scsi_mode_data data;
70a9b873 2511 int old_wp = sdkp->write_prot;
1da177e4
LT		 2512
2513 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2514 if (sdp->skip_ms_page_3f) {
b2bff6ce 2515 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2516 return;
2517 }
2518
ea73a9f2
JB		 2519 if (sdp->use_192_bytes_for_3f) {
2520 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2521 } else {
2522 /*
2523 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2524 * We have to start carefully: some devices hang if we ask
2525 * for more than is available.
2526 */
ea73a9f2 2527 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2528
2529 /*
2530 * Second attempt: ask for page 0 When only page 0 is
2531 * implemented, a request for page 3F may return Sense Key
2532 * 5: Illegal Request, Sense Code 24: Invalid field in
2533 * CDB.
2534 */
2535 if (!scsi_status_is_good(res))
ea73a9f2 2536 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2537
2538 /*
2539 * Third attempt: ask 255 bytes, as we did earlier.
2540 */
2541 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2542 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2543 &data, NULL);
1da177e4
LT		 2544 }
2545
2546 if (!scsi_status_is_good(res)) {
b2bff6ce 2547 sd_first_printk(KERN_WARNING, sdkp,
e73aec82 2548 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2549 } else {
2550 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2551 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2552 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2553 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2554 sdkp->write_prot ? "on" : "off");
df441cc0 2555 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
70a9b873 2556 }
1da177e4
LT		 2557 }
2558}
2559
2560/*
2561 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2562 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2563 */
2564static void
e73aec82 2565sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2566{
1da177e4 2567 int len = 0, res;
ea73a9f2 2568 struct scsi_device *sdp = sdkp->device;
1da177e4 2569
631e8a13
AV		 2570 int dbd;
2571 int modepage;
0bcaa111 2572 int first_len;
1da177e4
LT		 2573 struct scsi_mode_data data;
2574 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2575 int old_wce = sdkp->WCE;
2576 int old_rcd = sdkp->RCD;
2577 int old_dpofua = sdkp->DPOFUA;
1da177e4 2578
39c60a09
JB		 2579
2580 if (sdkp->cache_override)
2581 return;
2582
0bcaa111
LT		 2583 first_len = 4;
2584 if (sdp->skip_ms_page_8) {
2585 if (sdp->type == TYPE_RBC)
2586 goto defaults;
2587 else {
2588 if (sdp->skip_ms_page_3f)
2589 goto defaults;
2590 modepage = 0x3F;
2591 if (sdp->use_192_bytes_for_3f)
2592 first_len = 192;
2593 dbd = 0;
2594 }
2595 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2596 modepage = 6;
2597 dbd = 8;
2598 } else {
2599 modepage = 8;
2600 dbd = 0;
2601 }
2602
1da177e4 2603 /* cautiously ask */
0bcaa111
LT		 2604 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2605 &data, &sshdr);
1da177e4
LT		 2606
2607 if (!scsi_status_is_good(res))
2608 goto bad_sense;
2609
6d73c851
AV		 2610 if (!data.header_length) {
2611 modepage = 6;
0bcaa111 2612 first_len = 0;
b2bff6ce
MP		 2613 sd_first_printk(KERN_ERR, sdkp,
2614 "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2615 }
2616
1da177e4
LT		 2617 /* that went OK, now ask for the proper length */
2618 len = data.length;
2619
2620 /*
2621 * We're only interested in the first three bytes, actually.
2622 * But the data cache page is defined for the first 20.
2623 */
2624 if (len < 3)
2625 goto bad_sense;
0bcaa111 2626 else if (len > SD_BUF_SIZE) {
b2bff6ce 2627 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
0bcaa111
LT		 2628 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2629 len = SD_BUF_SIZE;
2630 }
2631 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2632 len = 192;
1da177e4
LT		 2633
2634 /* Get the data */
0bcaa111
LT		 2635 if (len > first_len)
2636 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2637 &data, &sshdr);
1da177e4
LT		 2638
2639 if (scsi_status_is_good(res)) {
631e8a13 2640 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2641
0bcaa111
LT		 2642 while (offset < len) {
2643 u8 page_code = buffer[offset] & 0x3F;
2644 u8 spf = buffer[offset] & 0x40;
2645
2646 if (page_code == 8 || page_code == 6) {
2647 /* We're interested only in the first 3 bytes.
2648 */
2649 if (len - offset <= 2) {
b2bff6ce
MP		 2650 sd_first_printk(KERN_ERR, sdkp,
2651 "Incomplete mode parameter "
2652 "data\n");
0bcaa111
LT		 2653 goto defaults;
2654 } else {
2655 modepage = page_code;
2656 goto Page_found;
2657 }
2658 } else {
2659 /* Go to the next page */
2660 if (spf && len - offset > 3)
2661 offset += 4 + (buffer[offset+2] << 8) +
2662 buffer[offset+3];
2663 else if (!spf && len - offset > 1)
2664 offset += 2 + buffer[offset+1];
2665 else {
b2bff6ce
MP		 2666 sd_first_printk(KERN_ERR, sdkp,
2667 "Incomplete mode "
2668 "parameter data\n");
0bcaa111
LT		 2669 goto defaults;
2670 }
2671 }
48970800
AV		 2672 }
2673
b2bff6ce 2674 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
984f1733
AS		 2675 goto defaults;
2676
0bcaa111 2677 Page_found:
631e8a13
AV		 2678 if (modepage == 8) {
2679 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2680 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2681 } else {
2682 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2683 sdkp->RCD = 0;
2684 }
1da177e4 2685
007365ad 2686 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
b14bf2d0
AS		 2687 if (sdp->broken_fua) {
2688 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2689 sdkp->DPOFUA = 0;
26f28197
DLM		 2690 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2691 !sdkp->device->use_16_for_rw) {
b2bff6ce 2692 sd_first_printk(KERN_NOTICE, sdkp,
e73aec82 2693 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2694 sdkp->DPOFUA = 0;
2695 }
2696
2eefd57b
SRT		 2697 /* No cache flush allowed for write protected devices */
2698 if (sdkp->WCE && sdkp->write_prot)
2699 sdkp->WCE = 0;
2700
70a9b873
MP		 2701 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2702 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2703 sd_printk(KERN_NOTICE, sdkp,
2704 "Write cache: %s, read cache: %s, %s\n",
2705 sdkp->WCE ? "enabled" : "disabled",
2706 sdkp->RCD ? "disabled" : "enabled",
2707 sdkp->DPOFUA ? "supports DPO and FUA"
2708 : "doesn't support DPO or FUA");
1da177e4
LT		 2709
2710 return;
2711 }
2712
2713bad_sense:
ea73a9f2 2714 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2715 sshdr.sense_key == ILLEGAL_REQUEST &&
2716 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82 2717 /* Invalid field in CDB */
b2bff6ce 2718 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2719 else
b2bff6ce
MP		 2720 sd_first_printk(KERN_ERR, sdkp,
2721 "Asking for cache data failed\n");
1da177e4
LT		 2722
2723defaults:
b81478d8 2724 if (sdp->wce_default_on) {
b2bff6ce
MP		 2725 sd_first_printk(KERN_NOTICE, sdkp,
2726 "Assuming drive cache: write back\n");
b81478d8
NJ		 2727 sdkp->WCE = 1;
2728 } else {
b2bff6ce
MP		 2729 sd_first_printk(KERN_ERR, sdkp,
2730 "Assuming drive cache: write through\n");
b81478d8
NJ		 2731 sdkp->WCE = 0;
2732 }
1da177e4 2733 sdkp->RCD = 0;
48970800 2734 sdkp->DPOFUA = 0;
1da177e4
LT		 2735}
2736
e0597d70
MP		 2737/*
2738 * The ATO bit indicates whether the DIF application tag is available
2739 * for use by the operating system.
2740 */
439d77f7 2741static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2742{
2743 int res, offset;
2744 struct scsi_device *sdp = sdkp->device;
2745 struct scsi_mode_data data;
2746 struct scsi_sense_hdr sshdr;
2747
89d94756 2748 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
e0597d70
MP		 2749 return;
2750
2751 if (sdkp->protection_type == 0)
2752 return;
2753
2754 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2755 SD_MAX_RETRIES, &data, &sshdr);
2756
2757 if (!scsi_status_is_good(res) || !data.header_length ||
2758 data.length < 6) {
b2bff6ce 2759 sd_first_printk(KERN_WARNING, sdkp,
e0597d70
MP		 2760 "getting Control mode page failed, assume no ATO\n");
2761
2762 if (scsi_sense_valid(&sshdr))
2763 sd_print_sense_hdr(sdkp, &sshdr);
2764
2765 return;
2766 }
2767
2768 offset = data.header_length + data.block_descriptor_length;
2769
2770 if ((buffer[offset] & 0x3f) != 0x0a) {
b2bff6ce 2771 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
e0597d70
MP		 2772 return;
2773 }
2774
2775 if ((buffer[offset + 5] & 0x80) == 0)
2776 return;
2777
2778 sdkp->ATO = 1;
2779
2780 return;
2781}
2782
d11b6916
MP		 2783/**
2784 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2785 * @disk: disk to query
2786 */
2787static void sd_read_block_limits(struct scsi_disk *sdkp)
2788{
2789 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2790 const int vpd_len = 64;
e3deec09 2791 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2792
e3deec09
JB		 2793 if (!buffer ||
2794 /* Block Limits VPD */
2795 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2796 goto out;
d11b6916
MP		 2797
2798 blk_queue_io_min(sdkp->disk->queue,
2799 get_unaligned_be16(&buffer[6]) * sector_sz);
ca369d51
MP		 2800
2801 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2802 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
d11b6916 2803
c98a0eb0
MP		 2804 if (buffer[3] == 0x3c) {
2805 unsigned int lba_count, desc_count;
e339c1a7 2806
5db44863 2807 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2808
c98a0eb0 2809 if (!sdkp->lbpme)
045d3fe7 2810 goto out;
045d3fe7 2811
c98a0eb0
MP		 2812 lba_count = get_unaligned_be32(&buffer[20]);
2813 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2814
c98a0eb0
MP		 2815 if (lba_count && desc_count)
2816 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2817
c98a0eb0 2818 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2819
2820 if (buffer[32] & 0x80)
c98a0eb0 2821 sdkp->unmap_alignment =
e339c1a7 2822 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2823
2824 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2825
2826 if (sdkp->max_unmap_blocks)
2827 sd_config_discard(sdkp, SD_LBP_UNMAP);
2828 else
2829 sd_config_discard(sdkp, SD_LBP_WS16);
2830
2831 } else { /* LBP VPD page tells us what to use */
bcd069bb 2832 if (sdkp->lbpu && sdkp->max_unmap_blocks)
e461338b
MP		 2833 sd_config_discard(sdkp, SD_LBP_UNMAP);
2834 else if (sdkp->lbpws)
c98a0eb0
MP		 2835 sd_config_discard(sdkp, SD_LBP_WS16);
2836 else if (sdkp->lbpws10)
2837 sd_config_discard(sdkp, SD_LBP_WS10);
7985090a
MP		 2838 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2839 sd_config_discard(sdkp, SD_LBP_UNMAP);
c98a0eb0
MP		 2840 else
2841 sd_config_discard(sdkp, SD_LBP_DISABLE);
2842 }
e339c1a7
MP		 2843 }
2844
e3deec09 2845 out:
d11b6916
MP		 2846 kfree(buffer);
2847}
2848
3821d768
MP		 2849/**
2850 * sd_read_block_characteristics - Query block dev. characteristics
2851 * @disk: disk to query
2852 */
2853static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2854{
89d94756 2855 struct request_queue *q = sdkp->disk->queue;
e3deec09 2856 unsigned char *buffer;
3821d768 2857 u16 rot;
bb2d3de1 2858 const int vpd_len = 64;
3821d768 2859
e3deec09 2860 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2861
e3deec09
JB		 2862 if (!buffer ||
2863 /* Block Device Characteristics VPD */
2864 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2865 goto out;
3821d768
MP		 2866
2867 rot = get_unaligned_be16(&buffer[4]);
2868
b277da0a 2869 if (rot == 1) {
89d94756
HR		 2870 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2871 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
b277da0a 2872 }
3821d768 2873
68af412c
DLM		 2874 if (sdkp->device->type == TYPE_ZBC) {
2875 /* Host-managed */
89d94756 2876 q->limits.zoned = BLK_ZONED_HM;
68af412c
DLM		 2877 } else {
2878 sdkp->zoned = (buffer[8] >> 4) & 3;
2879 if (sdkp->zoned == 1)
2880 /* Host-aware */
2881 q->limits.zoned = BLK_ZONED_HA;
2882 else
2883 /*
2884 * Treat drive-managed devices as
2885 * regular block devices.
2886 */
2887 q->limits.zoned = BLK_ZONED_NONE;
2888 }
89d94756
HR		 2889 if (blk_queue_is_zoned(q) && sdkp->first_scan)
2890 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2891 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2892
e3deec09 2893 out:
3821d768
MP		 2894 kfree(buffer);
2895}
2896
045d3fe7 2897/**
c98a0eb0 2898 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2899 * @disk: disk to query
2900 */
c98a0eb0 2901static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2902{
2903 unsigned char *buffer;
2904 const int vpd_len = 8;
2905
c98a0eb0 2906 if (sdkp->lbpme == 0)
045d3fe7
MP		 2907 return;
2908
2909 buffer = kmalloc(vpd_len, GFP_KERNEL);
2910
2911 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2912 goto out;
2913
c98a0eb0
MP		 2914 sdkp->lbpvpd = 1;
2915 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2916 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2917 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2918
2919 out:
2920 kfree(buffer);
2921}
2922
5db44863
MP		 2923static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2924{
66c28f97
MP		 2925 struct scsi_device *sdev = sdkp->device;
2926
54b2b50c
MP		 2927 if (sdev->host->no_write_same) {
2928 sdev->no_write_same = 1;
2929
2930 return;
2931 }
2932
66c28f97 2933 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af73623f
BS		 2934 /* too large values might cause issues with arcmsr */
2935 int vpd_buf_len = 64;
2936
66c28f97
MP		 2937 sdev->no_report_opcodes = 1;
2938
2939 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2940 * CODES is unsupported and the device has an ATA
2941 * Information VPD page (SAT).
2942 */
af73623f 2943 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
66c28f97
MP		 2944 sdev->no_write_same = 1;
2945 }
2946
2947 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2948 sdkp->ws16 = 1;
66c28f97
MP		 2949
2950 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2951 sdkp->ws10 = 1;
5db44863
MP		 2952}
2953
1da177e4
LT		 2954/**
2955 * sd_revalidate_disk - called the first time a new disk is seen,
2956 * performs disk spin up, read_capacity, etc.
2957 * @disk: struct gendisk we care about
2958 **/
2959static int sd_revalidate_disk(struct gendisk *disk)
2960{
2961 struct scsi_disk *sdkp = scsi_disk(disk);
2962 struct scsi_device *sdp = sdkp->device;
ca369d51 2963 struct request_queue *q = sdkp->disk->queue;
89d94756 2964 sector_t old_capacity = sdkp->capacity;
1da177e4 2965 unsigned char *buffer;
ca369d51 2966 unsigned int dev_max, rw_max;
1da177e4 2967
fa0d34be
MP		 2968 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2969 "sd_revalidate_disk\n"));
1da177e4
LT		 2970
2971 /*
2972 * If the device is offline, don't try and read capacity or any
2973 * of the other niceties.
2974 */
2975 if (!scsi_device_online(sdp))
2976 goto out;
2977
a6123f14 2978 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2979 if (!buffer) {
e73aec82
MP		 2980 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2981 "allocation failure.\n");
ea73a9f2 2982 goto out;
1da177e4
LT		 2983 }
2984
e73aec82 2985 sd_spinup_disk(sdkp);
1da177e4
LT		 2986
2987 /*
2988 * Without media there is no reason to ask; moreover, some devices
2989 * react badly if we do.
2990 */
2991 if (sdkp->media_present) {
e73aec82 2992 sd_read_capacity(sdkp, buffer);
ffd4bc2a 2993
5ddfe085 2994 if (scsi_device_supports_vpd(sdp)) {
c98a0eb0 2995 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2996 sd_read_block_limits(sdkp);
2997 sd_read_block_characteristics(sdkp);
89d94756 2998 sd_zbc_read_zones(sdkp, buffer);
ffd4bc2a
MP		 2999 }
3000
89d94756
HR		 3001 sd_print_capacity(sdkp, old_capacity);
3002
e73aec82
MP		 3003 sd_read_write_protect_flag(sdkp, buffer);
3004 sd_read_cache_type(sdkp, buffer);
e0597d70 3005 sd_read_app_tag_own(sdkp, buffer);
5db44863 3006 sd_read_write_same(sdkp, buffer);
1da177e4 3007 }
461d4e90 3008
70a9b873
MP		 3009 sdkp->first_scan = 0;
3010
461d4e90
TH		 3011 /*
3012 * We now have all cache related info, determine how we deal
4913efe4 3013 * with flush requests.
461d4e90 3014 */
cb2fb68d 3015 sd_set_flush_flag(sdkp);
461d4e90 3016
ca369d51
MP		 3017 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3018 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3019
3020 /* Some devices report a maximum block count for READ/WRITE requests. */
3021 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3022 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3023
3024 /*
3025 * Use the device's preferred I/O size for reads and writes
9c1d9c20
MP		 3026 * unless the reported value is unreasonably small, large, or
3027 * garbage.
ca369d51 3028 */
9c1d9c20
MP		 3029 if (sdkp->opt_xfer_blocks &&
3030 sdkp->opt_xfer_blocks <= dev_max &&
3031 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
6b7e9cde
MP		 3032 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3033 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3034 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3035 } else
ca369d51 3036 rw_max = BLK_DEF_MAX_SECTORS;
3a9794d3 3037
ca369d51
MP		 3038 /* Combine with controller limits */
3039 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
4f258a46 3040
f08bb1e0 3041 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
5db44863 3042 sd_config_write_same(sdkp);
1da177e4
LT		 3043 kfree(buffer);
3044
1da177e4
LT		 3045 out:
3046 return 0;
3047}
3048
72ec24bd
TH		 3049/**
3050 * sd_unlock_native_capacity - unlock native capacity
3051 * @disk: struct gendisk to set capacity for
3052 *
3053 * Block layer calls this function if it detects that partitions
3054 * on @disk reach beyond the end of the device. If the SCSI host
3055 * implements ->unlock_native_capacity() method, it's invoked to
3056 * give it a chance to adjust the device capacity.
3057 *
3058 * CONTEXT:
3059 * Defined by block layer. Might sleep.
3060 */
3061static void sd_unlock_native_capacity(struct gendisk *disk)
3062{
3063 struct scsi_device *sdev = scsi_disk(disk)->device;
3064
3065 if (sdev->host->hostt->unlock_native_capacity)
3066 sdev->host->hostt->unlock_native_capacity(sdev);
3067}
3068
3e1a7ff8
TH		 3069/**
3070 * sd_format_disk_name - format disk name
3071 * @prefix: name prefix - ie. "sd" for SCSI disks
3072 * @index: index of the disk to format name for
3073 * @buf: output buffer
3074 * @buflen: length of the output buffer
3075 *
3076 * SCSI disk names starts at sda. The 26th device is sdz and the
3077 * 27th is sdaa. The last one for two lettered suffix is sdzz
3078 * which is followed by sdaaa.
3079 *
3080 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 3081 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 3082 * determined using similar method as 26 base conversion with the
3083 * index shifted -1 after each digit is computed.
3084 *
3085 * CONTEXT:
3086 * Don't care.
3087 *
3088 * RETURNS:
3089 * 0 on success, -errno on failure.
3090 */
3091static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3092{
3093 const int base = 'z' - 'a' + 1;
3094 char *begin = buf + strlen(prefix);
3095 char *end = buf + buflen;
3096 char *p;
3097 int unit;
3098
3099 p = end - 1;
3100 *p = '\0';
3101 unit = base;
3102 do {
3103 if (p == begin)
3104 return -EINVAL;
3105 *--p = 'a' + (index % unit);
3106 index = (index / unit) - 1;
3107 } while (index >= 0);
3108
3109 memmove(begin, p, end - p);
3110 memcpy(buf, prefix, strlen(prefix));
3111
3112 return 0;
3113}
3114
4ace92fc
AV		 3115/*
3116 * The asynchronous part of sd_probe
3117 */
3118static void sd_probe_async(void *data, async_cookie_t cookie)
3119{
3120 struct scsi_disk *sdkp = data;
3121 struct scsi_device *sdp;
3122 struct gendisk *gd;
3123 u32 index;
3124 struct device *dev;
3125
3126 sdp = sdkp->device;
3127 gd = sdkp->disk;
3128 index = sdkp->index;
3129 dev = &sdp->sdev_gendev;
3130
1a03ae0f
MR		 3131 gd->major = sd_major((index & 0xf0) >> 4);
3132 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3133 gd->minors = SD_MINORS;
3134
4ace92fc
AV		 3135 gd->fops = &sd_fops;
3136 gd->private_data = &sdkp->driver;
3137 gd->queue = sdkp->device->request_queue;
3138
70a9b873
MP		 3139 /* defaults, until the device tells us otherwise */
3140 sdp->sector_size = 512;
3141 sdkp->capacity = 0;
3142 sdkp->media_present = 1;
3143 sdkp->write_prot = 0;
39c60a09 3144 sdkp->cache_override = 0;
70a9b873
MP		 3145 sdkp->WCE = 0;
3146 sdkp->RCD = 0;
3147 sdkp->ATO = 0;
3148 sdkp->first_scan = 1;
18a4d0a2 3149 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 3150
4ace92fc
AV		 3151 sd_revalidate_disk(gd);
3152
97fedbbe 3153 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 3154 if (sdp->removable) {
4ace92fc 3155 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 3156 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3157 }
4ace92fc 3158
10c580e4 3159 blk_pm_runtime_init(sdp->request_queue, dev);
0d52c756 3160 device_add_disk(dev, gd);
fe542396
MP		 3161 if (sdkp->capacity)
3162 sd_dif_config_host(sdkp);
4ace92fc 3163
3821d768
MP		 3164 sd_revalidate_disk(gd);
3165
4ace92fc
AV		 3166 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3167 sdp->removable ? "removable " : "");
478a8a05 3168 scsi_autopm_put_device(sdp);
ea038f63 3169 put_device(&sdkp->dev);
4ace92fc
AV		 3170}
3171
1da177e4
LT		 3172/**
3173 * sd_probe - called during driver initialization and whenever a
3174 * new scsi device is attached to the system. It is called once
3175 * for each scsi device (not just disks) present.
3176 * @dev: pointer to device object
3177 *
3178 * Returns 0 if successful (or not interested in this scsi device
3179 * (e.g. scanner)); 1 when there is an error.
3180 *
3181 * Note: this function is invoked from the scsi mid-level.
3182 * This function sets up the mapping between a given
3183 * <host,channel,id,lun> (found in sdp) and new device name
3184 * (e.g. /dev/sda). More precisely it is the block device major
3185 * and minor number that is chosen here.
3186 *
2db93ce8
PU		 3187 * Assume sd_probe is not re-entrant (for time being)
3188 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 3189 **/
3190static int sd_probe(struct device *dev)
3191{
3192 struct scsi_device *sdp = to_scsi_device(dev);
3193 struct scsi_disk *sdkp;
3194 struct gendisk *gd;
439d77f7 3195 int index;
1da177e4
LT		 3196 int error;
3197
6fe8c1db 3198 scsi_autopm_get_device(sdp);
1da177e4 3199 error = -ENODEV;
89d94756
HR		 3200 if (sdp->type != TYPE_DISK &&
3201 sdp->type != TYPE_ZBC &&
3202 sdp->type != TYPE_MOD &&
3203 sdp->type != TYPE_RBC)
1da177e4
LT		 3204 goto out;
3205
89d94756
HR		 3206#ifndef CONFIG_BLK_DEV_ZONED
3207 if (sdp->type == TYPE_ZBC)
3208 goto out;
3209#endif
9ccfc756 3210 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 3211 "sd_probe\n"));
1da177e4
LT		 3212
3213 error = -ENOMEM;
24669f75 3214 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 3215 if (!sdkp)
3216 goto out;
3217
689d6fac 3218 gd = alloc_disk(SD_MINORS);
1da177e4 3219 if (!gd)
c01228db 3220 goto out_free;
1da177e4 3221
f27bac27
TH		 3222 do {
3223 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3224 goto out_put;
1da177e4 3225
4034cc68 3226 spin_lock(&sd_index_lock);
f27bac27 3227 error = ida_get_new(&sd_index_ida, &index);
4034cc68 3228 spin_unlock(&sd_index_lock);
f27bac27 3229 } while (error == -EAGAIN);
1da177e4 3230
21208ae5
DK		 3231 if (error) {
3232 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 3233 goto out_put;
1a03ae0f
MR		 3234 }
3235
3e1a7ff8 3236 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 3237 if (error) {
3238 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 3239 goto out_free_index;
21208ae5 3240 }
f27bac27 3241
1da177e4
LT		 3242 sdkp->device = sdp;
3243 sdkp->driver = &sd_template;
3244 sdkp->disk = gd;
3245 sdkp->index = index;
409f3499 3246 atomic_set(&sdkp->openers, 0);
9e1a1537 3247 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 3248
601e7638
JB		 3249 if (!sdp->request_queue->rq_timeout) {
3250 if (sdp->type != TYPE_MOD)
3251 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3252 else
3253 blk_queue_rq_timeout(sdp->request_queue,
3254 SD_MOD_TIMEOUT);
3255 }
3256
3257 device_initialize(&sdkp->dev);
478a8a05 3258 sdkp->dev.parent = dev;
601e7638 3259 sdkp->dev.class = &sd_disk_class;
02aa2a37 3260 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
601e7638 3261
dee0586e
DC		 3262 error = device_add(&sdkp->dev);
3263 if (error)
601e7638
JB		 3264 goto out_free_index;
3265
478a8a05
AS		 3266 get_device(dev);
3267 dev_set_drvdata(dev, sdkp);
601e7638 3268
ea038f63 3269 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 3270 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 3271
3272 return 0;
3273
f27bac27 3274 out_free_index:
c01228db
JK		 3275 spin_lock(&sd_index_lock);
3276 ida_remove(&sd_index_ida, index);
3277 spin_unlock(&sd_index_lock);
6bdaa1f1 3278 out_put:
1da177e4 3279 put_disk(gd);
f170396c
CIK		 3280 out_free:
3281 kfree(sdkp);
6bdaa1f1 3282 out:
6fe8c1db 3283 scsi_autopm_put_device(sdp);
1da177e4
LT		 3284 return error;
3285}
3286
3287/**
3288 * sd_remove - called whenever a scsi disk (previously recognized by
3289 * sd_probe) is detached from the system. It is called (potentially
3290 * multiple times) during sd module unload.
f2a3313d 3291 * @dev: pointer to device object
1da177e4
LT		 3292 *
3293 * Note: this function is invoked from the scsi mid-level.
3294 * This function potentially frees up a device name (e.g. /dev/sdc)
3295 * that could be re-used by a subsequent sd_probe().
3296 * This function is not called when the built-in sd driver is "exit-ed".
3297 **/
3298static int sd_remove(struct device *dev)
3299{
601e7638 3300 struct scsi_disk *sdkp;
0761df9c 3301 dev_t devt;
1da177e4 3302
601e7638 3303 sdkp = dev_get_drvdata(dev);
0761df9c 3304 devt = disk_devt(sdkp->disk);
478a8a05
AS		 3305 scsi_autopm_get_device(sdkp->device);
3306
3c31b52f 3307 async_synchronize_full_domain(&scsi_sd_pm_domain);
a7a20d10 3308 async_synchronize_full_domain(&scsi_sd_probe_domain);
ee959b00 3309 device_del(&sdkp->dev);
1da177e4
LT		 3310 del_gendisk(sdkp->disk);
3311 sd_shutdown(dev);
39b7f1e2 3312
89d94756
HR		 3313 sd_zbc_remove(sdkp);
3314
0761df9c
HR		 3315 blk_register_region(devt, SD_MINORS, NULL,
3316 sd_default_probe, NULL, NULL);
3317
0b950672 3318 mutex_lock(&sd_ref_mutex);
39b7f1e2 3319 dev_set_drvdata(dev, NULL);
ee959b00 3320 put_device(&sdkp->dev);
0b950672 3321 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3322
3323 return 0;
3324}
3325
3326/**
3327 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3328 * @dev: pointer to embedded class device
1da177e4 3329 *
0b950672 3330 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3331 * called on last put, you should always use the scsi_disk_get()
3332 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3333 * and never do a direct put_device.
1da177e4 3334 **/
ee959b00 3335static void scsi_disk_release(struct device *dev)
1da177e4 3336{
ee959b00 3337 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3338 struct gendisk *disk = sdkp->disk;
3339
c01228db
JK		 3340 spin_lock(&sd_index_lock);
3341 ida_remove(&sd_index_ida, sdkp->index);
3342 spin_unlock(&sd_index_lock);
3343
1da177e4 3344 disk->private_data = NULL;
1da177e4 3345 put_disk(disk);
39b7f1e2 3346 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3347
3348 kfree(sdkp);
3349}
3350
cc5d2c8c 3351static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3352{
3353 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3354 struct scsi_sense_hdr sshdr;
cc5d2c8c 3355 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3356 int res;
3357
3358 if (start)
3359 cmd[4] |= 1; /* START */
3360
d2886ea3
SR		 3361 if (sdp->start_stop_pwr_cond)
3362 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3363
c3c94c5a
TH		 3364 if (!scsi_device_online(sdp))
3365 return -ENODEV;
3366
fcbfffe2
CH		 3367 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3368 SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
c3c94c5a 3369 if (res) {
ef61329d 3370 sd_print_result(sdkp, "Start/Stop Unit failed", res);
c3c94c5a 3371 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3372 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 3373 if (scsi_sense_valid(&sshdr) &&
3374 /* 0x3a is medium not present */
3375 sshdr.asc == 0x3a)
3376 res = 0;
c3c94c5a
TH		 3377 }
3378
95897910
ON		 3379 /* SCSI error codes must not go to the generic layer */
3380 if (res)
3381 return -EIO;
3382
3383 return 0;
c3c94c5a
TH		 3384}
3385
1da177e4
LT		 3386/*
3387 * Send a SYNCHRONIZE CACHE instruction down to the device through
3388 * the normal SCSI command structure. Wait for the command to
3389 * complete.
3390 */
3391static void sd_shutdown(struct device *dev)
3392{
3d9a1f53 3393 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1da177e4
LT		 3394
3395 if (!sdkp)
3396 return; /* this can happen */
3397
54f57588 3398 if (pm_runtime_suspended(dev))
3d9a1f53 3399 return;
54f57588 3400
95897910 3401 if (sdkp->WCE && sdkp->media_present) {
e73aec82
MP		 3402 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3403 sd_sync_cache(sdkp);
39b7f1e2 3404 }
c3c94c5a 3405
cc5d2c8c
JB		 3406 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3407 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3408 sd_start_stop_device(sdkp, 0);
c3c94c5a 3409 }
39b7f1e2 3410}
1da177e4 3411
95897910 3412static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
c3c94c5a 3413{
3d9a1f53 3414 struct scsi_disk *sdkp = dev_get_drvdata(dev);
09ff92fe 3415 int ret = 0;
c3c94c5a 3416
13b43891
AS		 3417 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3418 return 0;
c3c94c5a 3419
95897910 3420 if (sdkp->WCE && sdkp->media_present) {
cc5d2c8c 3421 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a 3422 ret = sd_sync_cache(sdkp);
95897910
ON		 3423 if (ret) {
3424 /* ignore OFFLINE device */
3425 if (ret == -ENODEV)
3426 ret = 0;
09ff92fe 3427 goto done;
95897910 3428 }
c3c94c5a
TH		 3429 }
3430
691e3d31 3431 if (sdkp->device->manage_start_stop) {
cc5d2c8c 3432 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
95897910 3433 /* an error is not worth aborting a system sleep */
cc5d2c8c 3434 ret = sd_start_stop_device(sdkp, 0);
95897910
ON		 3435 if (ignore_stop_errors)
3436 ret = 0;
c3c94c5a
TH		 3437 }
3438
09ff92fe 3439done:
09ff92fe 3440 return ret;
c3c94c5a
TH		 3441}
3442
95897910
ON		 3443static int sd_suspend_system(struct device *dev)
3444{
3445 return sd_suspend_common(dev, true);
3446}
3447
3448static int sd_suspend_runtime(struct device *dev)
3449{
3450 return sd_suspend_common(dev, false);
3451}
3452
c3c94c5a
TH		 3453static int sd_resume(struct device *dev)
3454{
3d9a1f53 3455 struct scsi_disk *sdkp = dev_get_drvdata(dev);
c3c94c5a 3456
13b43891
AS		 3457 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3458 return 0;
3459
cc5d2c8c 3460 if (!sdkp->device->manage_start_stop)
3d9a1f53 3461 return 0;
c3c94c5a 3462
cc5d2c8c 3463 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3d9a1f53 3464 return sd_start_stop_device(sdkp, 1);
c3c94c5a
TH		 3465}
3466
1da177e4
LT		 3467/**
3468 * init_sd - entry point for this driver (both when built in or when
3469 * a module).
3470 *
3471 * Note: this function registers this driver with the scsi mid-level.
3472 **/
3473static int __init init_sd(void)
3474{
5e4009ba 3475 int majors = 0, i, err;
1da177e4
LT		 3476
3477 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3478
0761df9c
HR		 3479 for (i = 0; i < SD_MAJORS; i++) {
3480 if (register_blkdev(sd_major(i), "sd") != 0)
3481 continue;
3482 majors++;
3483 blk_register_region(sd_major(i), SD_MINORS, NULL,
3484 sd_default_probe, NULL, NULL);
3485 }
1da177e4
LT		 3486
3487 if (!majors)
3488 return -ENODEV;
3489
5e4009ba
JG		 3490 err = class_register(&sd_disk_class);
3491 if (err)
3492 goto err_out;
6bdaa1f1 3493
4e7392ec
MP		 3494 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3495 0, 0, NULL);
3496 if (!sd_cdb_cache) {
3497 printk(KERN_ERR "sd: can't init extended cdb cache\n");
8d964478 3498 err = -ENOMEM;
4e7392ec
MP		 3499 goto err_out_class;
3500 }
3501
3502 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3503 if (!sd_cdb_pool) {
3504 printk(KERN_ERR "sd: can't init extended cdb pool\n");
8d964478 3505 err = -ENOMEM;
4e7392ec
MP		 3506 goto err_out_cache;
3507 }
3508
afd5e34b
JD		 3509 err = scsi_register_driver(&sd_template.gendrv);
3510 if (err)
3511 goto err_out_driver;
3512
5e4009ba
JG		 3513 return 0;
3514
afd5e34b
JD		 3515err_out_driver:
3516 mempool_destroy(sd_cdb_pool);
3517
4e7392ec
MP		 3518err_out_cache:
3519 kmem_cache_destroy(sd_cdb_cache);
3520
5e4009ba
JG		 3521err_out_class:
3522 class_unregister(&sd_disk_class);
3523err_out:
3524 for (i = 0; i < SD_MAJORS; i++)
3525 unregister_blkdev(sd_major(i), "sd");
3526 return err;
1da177e4
LT		 3527}
3528
3529/**
3530 * exit_sd - exit point for this driver (when it is a module).
3531 *
3532 * Note: this function unregisters this driver from the scsi mid-level.
3533 **/
3534static void __exit exit_sd(void)
3535{
3536 int i;
3537
3538 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3539
afd5e34b 3540 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3541 mempool_destroy(sd_cdb_pool);
3542 kmem_cache_destroy(sd_cdb_cache);
3543
5e4009ba
JG		 3544 class_unregister(&sd_disk_class);
3545
0761df9c
HR		 3546 for (i = 0; i < SD_MAJORS; i++) {
3547 blk_unregister_region(sd_major(i), SD_MINORS);
1da177e4 3548 unregister_blkdev(sd_major(i), "sd");
0761df9c 3549 }
1da177e4
LT		 3550}
3551
1da177e4
LT		 3552module_init(init_sd);
3553module_exit(exit_sd);
e73aec82
MP		 3554
3555static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3556 struct scsi_sense_hdr *sshdr)
3557{
21045519
HR		 3558 scsi_print_sense_hdr(sdkp->device,
3559 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
e73aec82
MP		 3560}
3561
ef61329d
HR		 3562static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3563 int result)
e73aec82 3564{
ef61329d
HR		 3565 const char *hb_string = scsi_hostbyte_string(result);
3566 const char *db_string = scsi_driverbyte_string(result);
3567
3568 if (hb_string || db_string)
3569 sd_printk(KERN_INFO, sdkp,
3570 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3571 hb_string ? hb_string : "invalid",
3572 db_string ? db_string : "invalid");
3573 else
3574 sd_printk(KERN_INFO, sdkp,
3575 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3576 msg, host_byte(result), driver_byte(result));
e73aec82
MP		 3577}
3578
Linux 6.x block layer and io_uring tree(s)