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block: remove the discard_zeroes_data flag
[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
18a4d0a2 421static ssize_t
e1ea2351
GKH		 422max_medium_access_timeouts_show(struct device *dev,
423 struct device_attribute *attr, char *buf)
18a4d0a2
MP		 424{
425 struct scsi_disk *sdkp = to_scsi_disk(dev);
426
427 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
428}
429
430static ssize_t
e1ea2351
GKH		 431max_medium_access_timeouts_store(struct device *dev,
432 struct device_attribute *attr, const char *buf,
433 size_t count)
18a4d0a2
MP		 434{
435 struct scsi_disk *sdkp = to_scsi_disk(dev);
436 int err;
437
438 if (!capable(CAP_SYS_ADMIN))
439 return -EACCES;
440
441 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
442
443 return err ? err : count;
444}
e1ea2351 445static DEVICE_ATTR_RW(max_medium_access_timeouts);
18a4d0a2 446
5db44863 447static ssize_t
e1ea2351
GKH		 448max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
449 char *buf)
5db44863
MP		 450{
451 struct scsi_disk *sdkp = to_scsi_disk(dev);
452
453 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
454}
455
456static ssize_t
e1ea2351
GKH		 457max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
458 const char *buf, size_t count)
5db44863
MP		 459{
460 struct scsi_disk *sdkp = to_scsi_disk(dev);
461 struct scsi_device *sdp = sdkp->device;
462 unsigned long max;
463 int err;
464
465 if (!capable(CAP_SYS_ADMIN))
466 return -EACCES;
467
89d94756 468 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
5db44863
MP		 469 return -EINVAL;
470
471 err = kstrtoul(buf, 10, &max);
472
473 if (err)
474 return err;
475
476 if (max == 0)
477 sdp->no_write_same = 1;
66c28f97
MP		 478 else if (max <= SD_MAX_WS16_BLOCKS) {
479 sdp->no_write_same = 0;
5db44863 480 sdkp->max_ws_blocks = max;
66c28f97 481 }
5db44863
MP		 482
483 sd_config_write_same(sdkp);
484
485 return count;
486}
e1ea2351
GKH		 487static DEVICE_ATTR_RW(max_write_same_blocks);
488
489static struct attribute *sd_disk_attrs[] = {
490 &dev_attr_cache_type.attr,
491 &dev_attr_FUA.attr,
492 &dev_attr_allow_restart.attr,
493 &dev_attr_manage_start_stop.attr,
494 &dev_attr_protection_type.attr,
495 &dev_attr_protection_mode.attr,
496 &dev_attr_app_tag_own.attr,
497 &dev_attr_thin_provisioning.attr,
498 &dev_attr_provisioning_mode.attr,
499 &dev_attr_max_write_same_blocks.attr,
500 &dev_attr_max_medium_access_timeouts.attr,
501 NULL,
6bdaa1f1 502};
e1ea2351 503ATTRIBUTE_GROUPS(sd_disk);
6bdaa1f1
JB		 504
505static struct class sd_disk_class = {
506 .name = "scsi_disk",
507 .owner = THIS_MODULE,
ee959b00 508 .dev_release = scsi_disk_release,
e1ea2351 509 .dev_groups = sd_disk_groups,
6bdaa1f1 510};
1da177e4 511
691e3d31 512static const struct dev_pm_ops sd_pm_ops = {
95897910 513 .suspend = sd_suspend_system,
691e3d31 514 .resume = sd_resume,
95897910 515 .poweroff = sd_suspend_system,
691e3d31 516 .restore = sd_resume,
95897910 517 .runtime_suspend = sd_suspend_runtime,
691e3d31
AL		 518 .runtime_resume = sd_resume,
519};
520
1da177e4 521static struct scsi_driver sd_template = {
1da177e4
LT		 522 .gendrv = {
523 .name = "sd",
3af6b352 524 .owner = THIS_MODULE,
1da177e4
LT		 525 .probe = sd_probe,
526 .remove = sd_remove,
527 .shutdown = sd_shutdown,
691e3d31 528 .pm = &sd_pm_ops,
1da177e4
LT		 529 },
530 .rescan = sd_rescan,
a1b73fc1
CH		 531 .init_command = sd_init_command,
532 .uninit_command = sd_uninit_command,
7b3d9545 533 .done = sd_done,
18a4d0a2 534 .eh_action = sd_eh_action,
1da177e4
LT		 535};
536
0761df9c
HR		 537/*
538 * Dummy kobj_map->probe function.
539 * The default ->probe function will call modprobe, which is
540 * pointless as this module is already loaded.
541 */
542static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
543{
544 return NULL;
545}
546
1da177e4
LT		 547/*
548 * Device no to disk mapping:
549 *
550 * major disc2 disc p1
551 * |............|.............|....|....| <- dev_t
552 * 31 20 19 8 7 4 3 0
553 *
554 * Inside a major, we have 16k disks, however mapped non-
555 * contiguously. The first 16 disks are for major0, the next
556 * ones with major1, ... Disk 256 is for major0 again, disk 272
557 * for major1, ...
558 * As we stay compatible with our numbering scheme, we can reuse
559 * the well-know SCSI majors 8, 65--71, 136--143.
560 */
561static int sd_major(int major_idx)
562{
563 switch (major_idx) {
564 case 0:
565 return SCSI_DISK0_MAJOR;
566 case 1 ... 7:
567 return SCSI_DISK1_MAJOR + major_idx - 1;
568 case 8 ... 15:
569 return SCSI_DISK8_MAJOR + major_idx - 8;
570 default:
571 BUG();
572 return 0; /* shut up gcc */
573 }
574}
575
3d9a1f53 576static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 577{
578 struct scsi_disk *sdkp = NULL;
579
3d9a1f53
CH		 580 mutex_lock(&sd_ref_mutex);
581
39b7f1e2
AS		 582 if (disk->private_data) {
583 sdkp = scsi_disk(disk);
584 if (scsi_device_get(sdkp->device) == 0)
ee959b00 585 get_device(&sdkp->dev);
39b7f1e2
AS		 586 else
587 sdkp = NULL;
588 }
0b950672 589 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 590 return sdkp;
591}
592
593static void scsi_disk_put(struct scsi_disk *sdkp)
594{
595 struct scsi_device *sdev = sdkp->device;
596
0b950672 597 mutex_lock(&sd_ref_mutex);
ee959b00 598 put_device(&sdkp->dev);
1da177e4 599 scsi_device_put(sdev);
0b950672 600 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 601}
602
c611529e
MP		 603static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
604 unsigned int dix, unsigned int dif)
35e1a5d9 605{
c611529e
MP		 606 struct bio *bio = scmd->request->bio;
607 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
608 unsigned int protect = 0;
609
610 if (dix) { /* DIX Type 0, 1, 2, 3 */
611 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
612 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
613
614 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
615 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
616 }
617
8475c811 618 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
c611529e
MP		 619 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
620
621 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
622 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
623 }
624
625 if (dif) { /* DIX/DIF Type 1, 2, 3 */
626 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
627
628 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
629 protect = 3 << 5; /* Disable target PI checking */
630 else
631 protect = 1 << 5; /* Enable target PI checking */
35e1a5d9
MP		 632 }
633
634 scsi_set_prot_op(scmd, prot_op);
635 scsi_set_prot_type(scmd, dif);
c611529e
MP		 636 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
637
638 return protect;
35e1a5d9
MP		 639}
640
c98a0eb0
MP		 641static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
642{
643 struct request_queue *q = sdkp->disk->queue;
644 unsigned int logical_block_size = sdkp->device->sector_size;
645 unsigned int max_blocks = 0;
646
39773722
MP		 647 /*
648 * When LBPRZ is reported, discard alignment and granularity
649 * must be fixed to the logical block size. Otherwise the block
650 * layer will drop misaligned portions of the request which can
651 * lead to data corruption. If LBPRZ is not set, we honor the
652 * device preference.
653 */
654 if (sdkp->lbprz) {
655 q->limits.discard_alignment = 0;
6540a65d 656 q->limits.discard_granularity = logical_block_size;
39773722
MP		 657 } else {
658 q->limits.discard_alignment = sdkp->unmap_alignment *
659 logical_block_size;
660 q->limits.discard_granularity =
661 max(sdkp->physical_block_size,
662 sdkp->unmap_granularity * logical_block_size);
663 }
c98a0eb0 664
89730393
MP		 665 sdkp->provisioning_mode = mode;
666
c98a0eb0
MP		 667 switch (mode) {
668
669 case SD_LBP_DISABLE:
2bb4cd5c 670 blk_queue_max_discard_sectors(q, 0);
c98a0eb0
MP		 671 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
672 return;
673
674 case SD_LBP_UNMAP:
5db44863
MP		 675 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
676 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 677 break;
678
679 case SD_LBP_WS16:
5db44863
MP		 680 max_blocks = min_not_zero(sdkp->max_ws_blocks,
681 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 682 break;
683
684 case SD_LBP_WS10:
5db44863
MP		 685 max_blocks = min_not_zero(sdkp->max_ws_blocks,
686 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 687 break;
688
689 case SD_LBP_ZERO:
5db44863
MP		 690 max_blocks = min_not_zero(sdkp->max_ws_blocks,
691 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 692 break;
693 }
694
2bb4cd5c 695 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
c98a0eb0 696 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 697}
698
81d926e8 699static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
e339c1a7 700{
6a7b4398 701 struct scsi_device *sdp = cmd->device;
81d926e8
CH		 702 struct request *rq = cmd->request;
703 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
704 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
705 unsigned int data_len = 24;
c98a0eb0 706 char *buf;
e339c1a7 707
81d926e8
CH		 708 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
709 if (!rq->special_vec.bv_page)
66ac0280 710 return BLKPREP_DEFER;
81d926e8
CH		 711 rq->special_vec.bv_offset = 0;
712 rq->special_vec.bv_len = data_len;
713 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
66ac0280 714
81d926e8
CH		 715 cmd->cmd_len = 10;
716 cmd->cmnd[0] = UNMAP;
717 cmd->cmnd[8] = 24;
e339c1a7 718
81d926e8
CH		 719 buf = page_address(rq->special_vec.bv_page);
720 put_unaligned_be16(6 + 16, &buf[0]);
721 put_unaligned_be16(16, &buf[2]);
722 put_unaligned_be64(sector, &buf[8]);
723 put_unaligned_be32(nr_sectors, &buf[16]);
c98a0eb0 724
81d926e8
CH		 725 cmd->allowed = SD_MAX_RETRIES;
726 cmd->transfersize = data_len;
727 rq->timeout = SD_TIMEOUT;
728 scsi_req(rq)->resid_len = data_len;
66ac0280 729
81d926e8
CH		 730 return scsi_init_io(cmd);
731}
c98a0eb0 732
02d26103 733static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
81d926e8
CH		 734{
735 struct scsi_device *sdp = cmd->device;
736 struct request *rq = cmd->request;
737 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
738 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
739 u32 data_len = sdp->sector_size;
c98a0eb0 740
81d926e8
CH		 741 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
742 if (!rq->special_vec.bv_page)
743 return BLKPREP_DEFER;
744 rq->special_vec.bv_offset = 0;
745 rq->special_vec.bv_len = data_len;
746 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
c98a0eb0 747
81d926e8
CH		 748 cmd->cmd_len = 16;
749 cmd->cmnd[0] = WRITE_SAME_16;
02d26103
CH		 750 if (unmap)
751 cmd->cmnd[1] = 0x8; /* UNMAP */
81d926e8
CH		 752 put_unaligned_be64(sector, &cmd->cmnd[2]);
753 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
e339c1a7 754
81d926e8
CH		 755 cmd->allowed = SD_MAX_RETRIES;
756 cmd->transfersize = data_len;
02d26103 757 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
81d926e8 758 scsi_req(rq)->resid_len = data_len;
6a7b4398 759
81d926e8
CH		 760 return scsi_init_io(cmd);
761}
6a7b4398 762
81d926e8
CH		 763static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
764{
765 struct scsi_device *sdp = cmd->device;
766 struct request *rq = cmd->request;
767 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
768 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
769 u32 data_len = sdp->sector_size;
f9d03f96 770
81d926e8
CH		 771 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
772 if (!rq->special_vec.bv_page)
773 return BLKPREP_DEFER;
774 rq->special_vec.bv_offset = 0;
775 rq->special_vec.bv_len = data_len;
f9d03f96 776 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
c98a0eb0 777
81d926e8
CH		 778 cmd->cmd_len = 10;
779 cmd->cmnd[0] = WRITE_SAME;
780 if (unmap)
781 cmd->cmnd[1] = 0x8; /* UNMAP */
782 put_unaligned_be32(sector, &cmd->cmnd[2]);
783 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
784
785 cmd->allowed = SD_MAX_RETRIES;
786 cmd->transfersize = data_len;
02d26103 787 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
81d926e8
CH		 788 scsi_req(rq)->resid_len = data_len;
789
790 return scsi_init_io(cmd);
f1126e95
FT		 791}
792
02d26103
CH		 793static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
794{
795 struct request *rq = cmd->request;
796 struct scsi_device *sdp = cmd->device;
797 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
798 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
799 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
800
e4b87837
CH		 801 if (!(rq->cmd_flags & REQ_NOUNMAP)) {
802 switch (sdkp->provisioning_mode) {
803 case SD_LBP_WS16:
804 return sd_setup_write_same16_cmnd(cmd, true);
805 case SD_LBP_WS10:
806 return sd_setup_write_same10_cmnd(cmd, true);
807 }
808 }
809
02d26103
CH		 810 if (sdp->no_write_same)
811 return BLKPREP_INVALID;
812 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
813 return sd_setup_write_same16_cmnd(cmd, false);
814 return sd_setup_write_same10_cmnd(cmd, false);
815}
816
5db44863
MP		 817static void sd_config_write_same(struct scsi_disk *sdkp)
818{
819 struct request_queue *q = sdkp->disk->queue;
820 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 821
822 if (sdkp->device->no_write_same) {
823 sdkp->max_ws_blocks = 0;
824 goto out;
825 }
826
827 /* Some devices can not handle block counts above 0xffff despite
828 * supporting WRITE SAME(16). Consequently we default to 64k
829 * blocks per I/O unless the device explicitly advertises a
830 * bigger limit.
831 */
66c28f97
MP		 832 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
833 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
834 (u32)SD_MAX_WS16_BLOCKS);
835 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
836 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
837 (u32)SD_MAX_WS10_BLOCKS);
838 else {
839 sdkp->device->no_write_same = 1;
840 sdkp->max_ws_blocks = 0;
841 }
5db44863
MP		 842
843out:
66c28f97
MP		 844 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
845 (logical_block_size >> 9));
02d26103
CH		 846 blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
847 (logical_block_size >> 9));
5db44863
MP		 848}
849
850/**
851 * sd_setup_write_same_cmnd - write the same data to multiple blocks
59b1134c 852 * @cmd: command to prepare
5db44863
MP		 853 *
854 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
855 * preference indicated by target device.
856 **/
59b1134c 857static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
5db44863 858{
59b1134c
CH		 859 struct request *rq = cmd->request;
860 struct scsi_device *sdp = cmd->device;
5db44863
MP		 861 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
862 struct bio *bio = rq->bio;
863 sector_t sector = blk_rq_pos(rq);
864 unsigned int nr_sectors = blk_rq_sectors(rq);
08965c2e 865 unsigned int nr_bytes = blk_rq_bytes(rq);
5db44863
MP		 866 int ret;
867
868 if (sdkp->device->no_write_same)
0fb5b1fb 869 return BLKPREP_INVALID;
5db44863 870
a4ad39b1 871 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
5db44863 872
89d94756
HR		 873 if (sd_is_zoned(sdkp)) {
874 ret = sd_zbc_setup_write_cmnd(cmd);
875 if (ret != BLKPREP_OK)
876 return ret;
877 }
878
5db44863
MP		 879 sector >>= ilog2(sdp->sector_size) - 9;
880 nr_sectors >>= ilog2(sdp->sector_size) - 9;
881
5db44863 882 rq->timeout = SD_WRITE_SAME_TIMEOUT;
5db44863
MP		 883
884 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
59b1134c
CH		 885 cmd->cmd_len = 16;
886 cmd->cmnd[0] = WRITE_SAME_16;
887 put_unaligned_be64(sector, &cmd->cmnd[2]);
888 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
5db44863 889 } else {
59b1134c
CH		 890 cmd->cmd_len = 10;
891 cmd->cmnd[0] = WRITE_SAME;
892 put_unaligned_be32(sector, &cmd->cmnd[2]);
893 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
5db44863
MP		 894 }
895
59b1134c 896 cmd->transfersize = sdp->sector_size;
a25ee548 897 cmd->allowed = SD_MAX_RETRIES;
08965c2e
BVA		 898
899 /*
900 * For WRITE SAME the data transferred via the DATA OUT buffer is
901 * different from the amount of data actually written to the target.
902 *
903 * We set up __data_len to the amount of data transferred via the
904 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
905 * to transfer a single sector of data first, but then reset it to
906 * the amount of data to be written right after so that the I/O path
907 * knows how much to actually write.
908 */
909 rq->__data_len = sdp->sector_size;
910 ret = scsi_init_io(cmd);
911 rq->__data_len = nr_bytes;
912 return ret;
5db44863
MP		 913}
914
a118c6c1 915static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
90467c29 916{
a118c6c1
CH		 917 struct request *rq = cmd->request;
918
919 /* flush requests don't perform I/O, zero the S/G table */
920 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
90467c29 921
a118c6c1
CH		 922 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
923 cmd->cmd_len = 10;
924 cmd->transfersize = 0;
925 cmd->allowed = SD_MAX_RETRIES;
926
26b9fd8b 927 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
a118c6c1 928 return BLKPREP_OK;
90467c29
FT		 929}
930
87949eee 931static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1da177e4 932{
a1b73fc1
CH		 933 struct request *rq = SCpnt->request;
934 struct scsi_device *sdp = SCpnt->device;
776b23a0 935 struct gendisk *disk = rq->rq_disk;
89d94756 936 struct scsi_disk *sdkp = scsi_disk(disk);
83096ebf 937 sector_t block = blk_rq_pos(rq);
18351070 938 sector_t threshold;
83096ebf 939 unsigned int this_count = blk_rq_sectors(rq);
c611529e 940 unsigned int dif, dix;
89d94756 941 bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
c611529e 942 int ret;
4e7392ec 943 unsigned char protect;
7f9a6bc4 944
89d94756
HR		 945 if (zoned_write) {
946 ret = sd_zbc_setup_write_cmnd(SCpnt);
947 if (ret != BLKPREP_OK)
948 return ret;
949 }
950
3c356bde 951 ret = scsi_init_io(SCpnt);
7f9a6bc4
JB		 952 if (ret != BLKPREP_OK)
953 goto out;
954 SCpnt = rq->special;
955
956 /* from here on until we're complete, any goto out
957 * is used for a killable error condition */
958 ret = BLKPREP_KILL;
1da177e4 959
a1b73fc1
CH		 960 SCSI_LOG_HLQUEUE(1,
961 scmd_printk(KERN_INFO, SCpnt,
962 "%s: block=%llu, count=%d\n",
963 __func__, (unsigned long long)block, this_count));
1da177e4
LT		 964
965 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 966 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 967 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 968 "Finishing %u sectors\n",
969 blk_rq_sectors(rq)));
fa0d34be
MP		 970 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
971 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 972 goto out;
1da177e4
LT		 973 }
974
975 if (sdp->changed) {
976 /*
977 * quietly refuse to do anything to a changed disc until
978 * the changed bit has been reset
979 */
3ff5588d 980 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 981 goto out;
1da177e4 982 }
7f9a6bc4 983
a0899d4d 984 /*
18351070
LT		 985 * Some SD card readers can't handle multi-sector accesses which touch
986 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 987 */
18351070
LT		 988 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
989 (sdp->sector_size / 512);
990
991 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
992 if (block < threshold) {
993 /* Access up to the threshold but not beyond */
994 this_count = threshold - block;
995 } else {
996 /* Access only a single hardware sector */
997 this_count = sdp->sector_size / 512;
998 }
999 }
a0899d4d 1000
fa0d34be
MP		 1001 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1002 (unsigned long long)block));
1da177e4
LT		 1003
1004 /*
1005 * If we have a 1K hardware sectorsize, prevent access to single
1006 * 512 byte sectors. In theory we could handle this - in fact
1007 * the scsi cdrom driver must be able to handle this because
1008 * we typically use 1K blocksizes, and cdroms typically have
1009 * 2K hardware sectorsizes. Of course, things are simpler
1010 * with the cdrom, since it is read-only. For performance
1011 * reasons, the filesystems should be able to handle this
1012 * and not force the scsi disk driver to use bounce buffers
1013 * for this.
1014 */
1015 if (sdp->sector_size == 1024) {
83096ebf 1016 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 1017 scmd_printk(KERN_ERR, SCpnt,
1018 "Bad block number requested\n");
7f9a6bc4 1019 goto out;
1da177e4
LT		 1020 } else {
1021 block = block >> 1;
1022 this_count = this_count >> 1;
1023 }
1024 }
1025 if (sdp->sector_size == 2048) {
83096ebf 1026 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 1027 scmd_printk(KERN_ERR, SCpnt,
1028 "Bad block number requested\n");
7f9a6bc4 1029 goto out;
1da177e4
LT		 1030 } else {
1031 block = block >> 2;
1032 this_count = this_count >> 2;
1033 }
1034 }
1035 if (sdp->sector_size == 4096) {
83096ebf 1036 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 1037 scmd_printk(KERN_ERR, SCpnt,
1038 "Bad block number requested\n");
7f9a6bc4 1039 goto out;
1da177e4
LT		 1040 } else {
1041 block = block >> 3;
1042 this_count = this_count >> 3;
1043 }
1044 }
1045 if (rq_data_dir(rq) == WRITE) {
1da177e4 1046 SCpnt->cmnd[0] = WRITE_6;
af55ff67 1047
8c579ab6 1048 if (blk_integrity_rq(rq))
c611529e 1049 sd_dif_prepare(SCpnt);
af55ff67 1050
1da177e4
LT		 1051 } else if (rq_data_dir(rq) == READ) {
1052 SCpnt->cmnd[0] = READ_6;
1da177e4 1053 } else {
ef295ecf 1054 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
7f9a6bc4 1055 goto out;
1da177e4
LT		 1056 }
1057
fa0d34be 1058 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 1059 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1060 (rq_data_dir(rq) == WRITE) ?
1061 "writing" : "reading", this_count,
83096ebf 1062 blk_rq_sectors(rq)));
1da177e4 1063
c611529e
MP		 1064 dix = scsi_prot_sg_count(SCpnt);
1065 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1066
1067 if (dif || dix)
1068 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
af55ff67 1069 else
4e7392ec
MP		 1070 protect = 0;
1071
8475c811 1072 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
4e7392ec
MP		 1073 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1074
1075 if (unlikely(SCpnt->cmnd == NULL)) {
1076 ret = BLKPREP_DEFER;
1077 goto out;
1078 }
af55ff67 1079
4e7392ec
MP		 1080 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1081 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1082 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1083 SCpnt->cmnd[7] = 0x18;
1084 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1085 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1086
1087 /* LBA */
1088 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1089 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1090 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1091 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1092 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1093 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1094 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1095 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1096
1097 /* Expected Indirect LBA */
1098 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1099 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1100 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1101 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1102
1103 /* Transfer length */
1104 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1105 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1106 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1107 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
e430cbc8 1108 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1da177e4 1109 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1110 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1111 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1112 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1113 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1114 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1115 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1116 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1117 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1118 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1119 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1120 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1121 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1122 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1123 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1124 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1125 scsi_device_protection(SCpnt->device) ||
1da177e4 1126 SCpnt->device->use_10_for_rw) {
1da177e4 1127 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1128 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1129 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1130 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1131 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1132 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1133 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1134 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1135 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1136 } else {
33659ebb 1137 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1138 /*
1139 * This happens only if this drive failed
1140 * 10byte rw command with ILLEGAL_REQUEST
1141 * during operation and thus turned off
1142 * use_10_for_rw.
1143 */
e73aec82
MP		 1144 scmd_printk(KERN_ERR, SCpnt,
1145 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1146 goto out;
007365ad
TH		 1147 }
1148
1da177e4
LT		 1149 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1150 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1151 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1152 SCpnt->cmnd[4] = (unsigned char) this_count;
1153 SCpnt->cmnd[5] = 0;
1154 }
30b0c37b 1155 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4
LT		 1156
1157 /*
1158 * We shouldn't disconnect in the middle of a sector, so with a dumb
1159 * host adapter, it's safe to assume that we can at least transfer
1160 * this many bytes between each connect / disconnect.
1161 */
1162 SCpnt->transfersize = sdp->sector_size;
1163 SCpnt->underflow = this_count << 9;
1164 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1165
1da177e4
LT		 1166 /*
1167 * This indicates that the command is ready from our end to be
1168 * queued.
1169 */
7f9a6bc4
JB		 1170 ret = BLKPREP_OK;
1171 out:
89d94756
HR		 1172 if (zoned_write && ret != BLKPREP_OK)
1173 sd_zbc_cancel_write_cmnd(SCpnt);
1174
a1b73fc1 1175 return ret;
1da177e4
LT		 1176}
1177
87949eee
CH		 1178static int sd_init_command(struct scsi_cmnd *cmd)
1179{
1180 struct request *rq = cmd->request;
1181
c2df40df
MC		 1182 switch (req_op(rq)) {
1183 case REQ_OP_DISCARD:
81d926e8
CH		 1184 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1185 case SD_LBP_UNMAP:
1186 return sd_setup_unmap_cmnd(cmd);
1187 case SD_LBP_WS16:
02d26103 1188 return sd_setup_write_same16_cmnd(cmd, true);
81d926e8
CH		 1189 case SD_LBP_WS10:
1190 return sd_setup_write_same10_cmnd(cmd, true);
1191 case SD_LBP_ZERO:
1192 return sd_setup_write_same10_cmnd(cmd, false);
1193 default:
1194 return BLKPREP_INVALID;
1195 }
02d26103
CH		 1196 case REQ_OP_WRITE_ZEROES:
1197 return sd_setup_write_zeroes_cmnd(cmd);
c2df40df 1198 case REQ_OP_WRITE_SAME:
87949eee 1199 return sd_setup_write_same_cmnd(cmd);
3a5e02ce 1200 case REQ_OP_FLUSH:
87949eee 1201 return sd_setup_flush_cmnd(cmd);
c2df40df
MC		 1202 case REQ_OP_READ:
1203 case REQ_OP_WRITE:
87949eee 1204 return sd_setup_read_write_cmnd(cmd);
89d94756
HR		 1205 case REQ_OP_ZONE_REPORT:
1206 return sd_zbc_setup_report_cmnd(cmd);
1207 case REQ_OP_ZONE_RESET:
1208 return sd_zbc_setup_reset_cmnd(cmd);
c2df40df
MC		 1209 default:
1210 BUG();
1211 }
87949eee
CH		 1212}
1213
1214static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1215{
1216 struct request *rq = SCpnt->request;
1217
f9d03f96
CH		 1218 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1219 __free_page(rq->special_vec.bv_page);
87949eee 1220
82ed4db4 1221 if (SCpnt->cmnd != scsi_req(rq)->cmd) {
87949eee
CH		 1222 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1223 SCpnt->cmnd = NULL;
1224 SCpnt->cmd_len = 0;
1225 }
1226}
1227
1da177e4
LT		 1228/**
1229 * sd_open - open a scsi disk device
1230 * @inode: only i_rdev member may be used
1231 * @filp: only f_mode and f_flags may be used
1232 *
1233 * Returns 0 if successful. Returns a negated errno value in case
1234 * of error.
1235 *
1236 * Note: This can be called from a user context (e.g. fsck(1) )
1237 * or from within the kernel (e.g. as a result of a mount(1) ).
1238 * In the latter case @inode and @filp carry an abridged amount
1239 * of information as noted above.
409f3499
AB		 1240 *
1241 * Locking: called with bdev->bd_mutex held.
1da177e4 1242 **/
0338e291 1243static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1244{
0338e291 1245 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1246 struct scsi_device *sdev;
1247 int retval;
1248
0338e291 1249 if (!sdkp)
1da177e4
LT		 1250 return -ENXIO;
1251
fa0d34be 1252 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1253
1254 sdev = sdkp->device;
1255
1256 /*
1257 * If the device is in error recovery, wait until it is done.
1258 * If the device is offline, then disallow any access to it.
1259 */
1260 retval = -ENXIO;
1261 if (!scsi_block_when_processing_errors(sdev))
1262 goto error_out;
1263
1264 if (sdev->removable || sdkp->write_prot)
0338e291 1265 check_disk_change(bdev);
1da177e4
LT		 1266
1267 /*
1268 * If the drive is empty, just let the open fail.
1269 */
1270 retval = -ENOMEDIUM;
0338e291 1271 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1272 goto error_out;
1273
1274 /*
1275 * If the device has the write protect tab set, have the open fail
1276 * if the user expects to be able to write to the thing.
1277 */
1278 retval = -EROFS;
0338e291 1279 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1280 goto error_out;
1281
1282 /*
1283 * It is possible that the disk changing stuff resulted in
1284 * the device being taken offline. If this is the case,
1285 * report this to the user, and don't pretend that the
1286 * open actually succeeded.
1287 */
1288 retval = -ENXIO;
1289 if (!scsi_device_online(sdev))
1290 goto error_out;
1291
409f3499 1292 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1293 if (scsi_block_when_processing_errors(sdev))
1294 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1295 }
1296
1297 return 0;
1298
1299error_out:
1300 scsi_disk_put(sdkp);
1301 return retval;
1302}
1303
1304/**
1305 * sd_release - invoked when the (last) close(2) is called on this
1306 * scsi disk.
1307 * @inode: only i_rdev member may be used
1308 * @filp: only f_mode and f_flags may be used
1309 *
1310 * Returns 0.
1311 *
1312 * Note: may block (uninterruptible) if error recovery is underway
1313 * on this disk.
409f3499
AB		 1314 *
1315 * Locking: called with bdev->bd_mutex held.
1da177e4 1316 **/
db2a144b 1317static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1318{
1da177e4
LT		 1319 struct scsi_disk *sdkp = scsi_disk(disk);
1320 struct scsi_device *sdev = sdkp->device;
1321
56937f7b 1322 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1323
7e443312 1324 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1325 if (scsi_block_when_processing_errors(sdev))
1326 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1327 }
1328
1329 /*
1330 * XXX and what if there are packets in flight and this close()
1331 * XXX is followed by a "rmmod sd_mod"?
1332 */
478a8a05 1333
1da177e4 1334 scsi_disk_put(sdkp);
1da177e4
LT		 1335}
1336
a885c8c4 1337static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1338{
1339 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1340 struct scsi_device *sdp = sdkp->device;
1341 struct Scsi_Host *host = sdp->host;
f08bb1e0 1342 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1da177e4
LT		 1343 int diskinfo[4];
1344
1345 /* default to most commonly used values */
f08bb1e0
MP		 1346 diskinfo[0] = 0x40; /* 1 << 6 */
1347 diskinfo[1] = 0x20; /* 1 << 5 */
1348 diskinfo[2] = capacity >> 11;
1349
1da177e4
LT		 1350 /* override with calculated, extended default, or driver values */
1351 if (host->hostt->bios_param)
f08bb1e0 1352 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1da177e4 1353 else
f08bb1e0 1354 scsicam_bios_param(bdev, capacity, diskinfo);
1da177e4 1355
a885c8c4
CH		 1356 geo->heads = diskinfo[0];
1357 geo->sectors = diskinfo[1];
1358 geo->cylinders = diskinfo[2];
1da177e4
LT		 1359 return 0;
1360}
1361
1362/**
1363 * sd_ioctl - process an ioctl
1364 * @inode: only i_rdev/i_bdev members may be used
1365 * @filp: only f_mode and f_flags may be used
1366 * @cmd: ioctl command number
1367 * @arg: this is third argument given to ioctl(2) system call.
1368 * Often contains a pointer.
1369 *
25985edc 1370 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1371 * success as well). Returns a negated errno value in case of error.
1372 *
1373 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1374 * down in the scsi subsystem.
1da177e4 1375 **/
0338e291 1376static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1377 unsigned int cmd, unsigned long arg)
1378{
1da177e4 1379 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1380 struct scsi_disk *sdkp = scsi_disk(disk);
1381 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1382 void __user *p = (void __user *)arg;
1383 int error;
1384
fe2d1851
NN		 1385 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1386 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1387
0bfc96cb
PB		 1388 error = scsi_verify_blk_ioctl(bdev, cmd);
1389 if (error < 0)
1390 return error;
1391
1da177e4
LT		 1392 /*
1393 * If we are in the middle of error recovery, don't let anyone
1394 * else try and use this device. Also, if error recovery fails, it
1395 * may try and take the device offline, in which case all further
1396 * access to the device is prohibited.
1397 */
906d15fb
CH		 1398 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1399 (mode & FMODE_NDELAY) != 0);
1400 if (error)
8a6cfeb6 1401 goto out;
1da177e4 1402
1da177e4
LT		 1403 /*
1404 * Send SCSI addressing ioctls directly to mid level, send other
1405 * ioctls to block level and then onto mid level if they can't be
1406 * resolved.
1407 */
1408 switch (cmd) {
1409 case SCSI_IOCTL_GET_IDLUN:
1410 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1411 error = scsi_ioctl(sdp, cmd, p);
1412 break;
1da177e4 1413 default:
577ebb37 1414 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1415 if (error != -ENOTTY)
8a6cfeb6
AB		 1416 break;
1417 error = scsi_ioctl(sdp, cmd, p);
1418 break;
1da177e4 1419 }
8a6cfeb6 1420out:
8a6cfeb6 1421 return error;
1da177e4
LT		 1422}
1423
1424static void set_media_not_present(struct scsi_disk *sdkp)
1425{
2bae0093
TH		 1426 if (sdkp->media_present)
1427 sdkp->device->changed = 1;
1428
1429 if (sdkp->device->removable) {
1430 sdkp->media_present = 0;
1431 sdkp->capacity = 0;
1432 }
1433}
1434
1435static int media_not_present(struct scsi_disk *sdkp,
1436 struct scsi_sense_hdr *sshdr)
1437{
1438 if (!scsi_sense_valid(sshdr))
1439 return 0;
1440
1441 /* not invoked for commands that could return deferred errors */
1442 switch (sshdr->sense_key) {
1443 case UNIT_ATTENTION:
1444 case NOT_READY:
1445 /* medium not present */
1446 if (sshdr->asc == 0x3A) {
1447 set_media_not_present(sdkp);
1448 return 1;
1449 }
1450 }
1451 return 0;
1da177e4
LT		 1452}
1453
1454/**
2bae0093
TH		 1455 * sd_check_events - check media events
1456 * @disk: kernel device descriptor
1457 * @clearing: disk events currently being cleared
1da177e4 1458 *
2bae0093 1459 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1460 *
1461 * Note: this function is invoked from the block subsystem.
1462 **/
2bae0093 1463static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4 1464{
eb72d0bb
HR		 1465 struct scsi_disk *sdkp = scsi_disk_get(disk);
1466 struct scsi_device *sdp;
1da177e4
LT		 1467 int retval;
1468
eb72d0bb
HR		 1469 if (!sdkp)
1470 return 0;
1471
1472 sdp = sdkp->device;
2bae0093 1473 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1474
1475 /*
1476 * If the device is offline, don't send any commands - just pretend as
1477 * if the command failed. If the device ever comes back online, we
1478 * can deal with it then. It is only because of unrecoverable errors
1479 * that we would ever take a device offline in the first place.
1480 */
285e9670
KS		 1481 if (!scsi_device_online(sdp)) {
1482 set_media_not_present(sdkp);
285e9670
KS		 1483 goto out;
1484 }
1da177e4
LT		 1485
1486 /*
1487 * Using TEST_UNIT_READY enables differentiation between drive with
1488 * no cartridge loaded - NOT READY, drive with changed cartridge -
1489 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1490 *
1491 * Drives that auto spin down. eg iomega jaz 1G, will be started
1492 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1493 * sd_revalidate() is called.
1494 */
001aac25 1495 if (scsi_block_when_processing_errors(sdp)) {
6fa2b8f9
CH		 1496 struct scsi_sense_hdr sshdr = { 0, };
1497
001aac25 1498 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
6fa2b8f9 1499 &sshdr);
1da177e4 1500
6fa2b8f9
CH		 1501 /* failed to execute TUR, assume media not present */
1502 if (host_byte(retval)) {
1503 set_media_not_present(sdkp);
1504 goto out;
1505 }
1da177e4 1506
6fa2b8f9
CH		 1507 if (media_not_present(sdkp, &sshdr))
1508 goto out;
1509 }
2bae0093 1510
1da177e4
LT		 1511 /*
1512 * For removable scsi disk we have to recognise the presence
2bae0093 1513 * of a disk in the drive.
1da177e4 1514 */
2bae0093
TH		 1515 if (!sdkp->media_present)
1516 sdp->changed = 1;
1da177e4 1517 sdkp->media_present = 1;
285e9670 1518out:
3ff5588d 1519 /*
2bae0093 1520 * sdp->changed is set under the following conditions:
3ff5588d 1521 *
2bae0093
TH		 1522 * Medium present state has changed in either direction.
1523 * Device has indicated UNIT_ATTENTION.
3ff5588d 1524 */
2bae0093
TH		 1525 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1526 sdp->changed = 0;
eb72d0bb 1527 scsi_disk_put(sdkp);
1da177e4 1528 return retval;
1da177e4
LT		 1529}
1530
e73aec82 1531static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1532{
1da177e4 1533 int retries, res;
e73aec82 1534 struct scsi_device *sdp = sdkp->device;
7e660100
JB		 1535 const int timeout = sdp->request_queue->rq_timeout
1536 * SD_FLUSH_TIMEOUT_MULTIPLIER;
ea73a9f2 1537 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1538
1539 if (!scsi_device_online(sdp))
1540 return -ENODEV;
1541
1da177e4
LT		 1542 for (retries = 3; retries > 0; --retries) {
1543 unsigned char cmd[10] = { 0 };
1544
1545 cmd[0] = SYNCHRONIZE_CACHE;
1546 /*
1547 * Leave the rest of the command zero to indicate
1548 * flush everything.
1549 */
fcbfffe2
CH		 1550 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
1551 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
ea73a9f2 1552 if (res == 0)
1da177e4
LT		 1553 break;
1554 }
1555
e73aec82 1556 if (res) {
ef61329d 1557 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
95897910 1558
e73aec82
MP		 1559 if (driver_byte(res) & DRIVER_SENSE)
1560 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 1561 /* we need to evaluate the error return */
1562 if (scsi_sense_valid(&sshdr) &&
7aae5134
AS		 1563 (sshdr.asc == 0x3a || /* medium not present */
1564 sshdr.asc == 0x20)) /* invalid command */
95897910
ON		 1565 /* this is no error here */
1566 return 0;
1567
1568 switch (host_byte(res)) {
1569 /* ignore errors due to racing a disconnection */
1570 case DID_BAD_TARGET:
1571 case DID_NO_CONNECT:
1572 return 0;
1573 /* signal the upper layer it might try again */
1574 case DID_BUS_BUSY:
1575 case DID_IMM_RETRY:
1576 case DID_REQUEUE:
1577 case DID_SOFT_ERROR:
1578 return -EBUSY;
1579 default:
1580 return -EIO;
1581 }
1da177e4 1582 }
3721050a 1583 return 0;
1da177e4
LT		 1584}
1585
1da177e4
LT		 1586static void sd_rescan(struct device *dev)
1587{
3d9a1f53 1588 struct scsi_disk *sdkp = dev_get_drvdata(dev);
39b7f1e2 1589
3d9a1f53 1590 revalidate_disk(sdkp->disk);
1da177e4
LT		 1591}
1592
1593
1594#ifdef CONFIG_COMPAT
1595/*
1596 * This gets directly called from VFS. When the ioctl
1597 * is not recognized we go back to the other translation paths.
1598 */
0338e291
AV		 1599static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1600 unsigned int cmd, unsigned long arg)
1da177e4 1601{
0338e291 1602 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
21a9d4c9 1603 int error;
1da177e4 1604
21a9d4c9
CH		 1605 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1606 (mode & FMODE_NDELAY) != 0);
1607 if (error)
1608 return error;
1da177e4 1609
1da177e4
LT		 1610 /*
1611 * Let the static ioctl translation table take care of it.
1612 */
21a9d4c9
CH		 1613 if (!sdev->host->hostt->compat_ioctl)
1614 return -ENOIOCTLCMD;
1615 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1da177e4
LT		 1616}
1617#endif
1618
924d55b0
CH		 1619static char sd_pr_type(enum pr_type type)
1620{
1621 switch (type) {
1622 case PR_WRITE_EXCLUSIVE:
1623 return 0x01;
1624 case PR_EXCLUSIVE_ACCESS:
1625 return 0x03;
1626 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1627 return 0x05;
1628 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1629 return 0x06;
1630 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1631 return 0x07;
1632 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1633 return 0x08;
1634 default:
1635 return 0;
1636 }
1637};
1638
1639static int sd_pr_command(struct block_device *bdev, u8 sa,
1640 u64 key, u64 sa_key, u8 type, u8 flags)
1641{
1642 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1643 struct scsi_sense_hdr sshdr;
1644 int result;
1645 u8 cmd[16] = { 0, };
1646 u8 data[24] = { 0, };
1647
1648 cmd[0] = PERSISTENT_RESERVE_OUT;
1649 cmd[1] = sa;
1650 cmd[2] = type;
1651 put_unaligned_be32(sizeof(data), &cmd[5]);
1652
1653 put_unaligned_be64(key, &data[0]);
1654 put_unaligned_be64(sa_key, &data[8]);
1655 data[20] = flags;
1656
1657 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1658 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1659
1660 if ((driver_byte(result) & DRIVER_SENSE) &&
1661 (scsi_sense_valid(&sshdr))) {
1662 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1663 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1664 }
1665
1666 return result;
1667}
1668
1669static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1670 u32 flags)
1671{
1672 if (flags & ~PR_FL_IGNORE_KEY)
1673 return -EOPNOTSUPP;
1674 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1675 old_key, new_key, 0,
01f90dd9 1676 (1 << 0) /* APTPL */);
924d55b0
CH		 1677}
1678
1679static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1680 u32 flags)
1681{
1682 if (flags)
1683 return -EOPNOTSUPP;
1684 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1685}
1686
1687static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1688{
1689 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1690}
1691
1692static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1693 enum pr_type type, bool abort)
1694{
1695 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1696 sd_pr_type(type), 0);
1697}
1698
1699static int sd_pr_clear(struct block_device *bdev, u64 key)
1700{
1701 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1702}
1703
1704static const struct pr_ops sd_pr_ops = {
1705 .pr_register = sd_pr_register,
1706 .pr_reserve = sd_pr_reserve,
1707 .pr_release = sd_pr_release,
1708 .pr_preempt = sd_pr_preempt,
1709 .pr_clear = sd_pr_clear,
1710};
1711
83d5cde4 1712static const struct block_device_operations sd_fops = {
1da177e4 1713 .owner = THIS_MODULE,
0338e291
AV		 1714 .open = sd_open,
1715 .release = sd_release,
8a6cfeb6 1716 .ioctl = sd_ioctl,
a885c8c4 1717 .getgeo = sd_getgeo,
1da177e4 1718#ifdef CONFIG_COMPAT
0338e291 1719 .compat_ioctl = sd_compat_ioctl,
1da177e4 1720#endif
2bae0093 1721 .check_events = sd_check_events,
1da177e4 1722 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1723 .unlock_native_capacity = sd_unlock_native_capacity,
924d55b0 1724 .pr_ops = &sd_pr_ops,
1da177e4
LT		 1725};
1726
18a4d0a2
MP		 1727/**
1728 * sd_eh_action - error handling callback
1729 * @scmd: sd-issued command that has failed
18a4d0a2
MP		 1730 * @eh_disp: The recovery disposition suggested by the midlayer
1731 *
2451079b
JB		 1732 * This function is called by the SCSI midlayer upon completion of an
1733 * error test command (currently TEST UNIT READY). The result of sending
1734 * the eh command is passed in eh_disp. We're looking for devices that
1735 * fail medium access commands but are OK with non access commands like
1736 * test unit ready (so wrongly see the device as having a successful
1737 * recovery)
18a4d0a2 1738 **/
2451079b 1739static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
18a4d0a2
MP		 1740{
1741 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1742
1743 if (!scsi_device_online(scmd->device) ||
2451079b
JB		 1744 !scsi_medium_access_command(scmd) ||
1745 host_byte(scmd->result) != DID_TIME_OUT ||
1746 eh_disp != SUCCESS)
18a4d0a2
MP		 1747 return eh_disp;
1748
1749 /*
1750 * The device has timed out executing a medium access command.
1751 * However, the TEST UNIT READY command sent during error
1752 * handling completed successfully. Either the device is in the
1753 * process of recovering or has it suffered an internal failure
1754 * that prevents access to the storage medium.
1755 */
2451079b 1756 sdkp->medium_access_timed_out++;
18a4d0a2
MP		 1757
1758 /*
1759 * If the device keeps failing read/write commands but TEST UNIT
1760 * READY always completes successfully we assume that medium
1761 * access is no longer possible and take the device offline.
1762 */
1763 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1764 scmd_printk(KERN_ERR, scmd,
1765 "Medium access timeout failure. Offlining disk!\n");
1766 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1767
1768 return FAILED;
1769 }
1770
1771 return eh_disp;
1772}
1773
af55ff67
MP		 1774static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1775{
83096ebf
TH		 1776 u64 start_lba = blk_rq_pos(scmd->request);
1777 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
74856fbf 1778 u64 factor = scmd->device->sector_size / 512;
af55ff67
MP		 1779 u64 bad_lba;
1780 int info_valid;
a8733c7b
JB		 1781 /*
1782 * resid is optional but mostly filled in. When it's unused,
1783 * its value is zero, so we assume the whole buffer transferred
1784 */
1785 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1786 unsigned int good_bytes;
af55ff67 1787
af55ff67
MP		 1788 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1789 SCSI_SENSE_BUFFERSIZE,
1790 &bad_lba);
1791 if (!info_valid)
1792 return 0;
1793
1794 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1795 return 0;
1796
74856fbf
MH		 1797 /* be careful ... don't want any overflows */
1798 do_div(start_lba, factor);
1799 do_div(end_lba, factor);
af55ff67
MP		 1800
1801 /* The bad lba was reported incorrectly, we have no idea where
1802 * the error is.
1803 */
1804 if (bad_lba < start_lba || bad_lba >= end_lba)
1805 return 0;
1806
1807 /* This computation should always be done in terms of
1808 * the resolution of the device's medium.
1809 */
a8733c7b
JB		 1810 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1811 return min(good_bytes, transferred);
af55ff67
MP		 1812}
1813
1da177e4 1814/**
7b3d9545 1815 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1816 * driver has completed (successfully or otherwise) a scsi command.
1817 * @SCpnt: mid-level's per command structure.
1818 *
1819 * Note: potentially run from within an ISR. Must not block.
1820 **/
7b3d9545 1821static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1822{
1823 int result = SCpnt->result;
af55ff67 1824 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
c46f0917
DLM		 1825 unsigned int sector_size = SCpnt->device->sector_size;
1826 unsigned int resid;
1da177e4 1827 struct scsi_sense_hdr sshdr;
4e7392ec 1828 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1829 struct request *req = SCpnt->request;
1da177e4
LT		 1830 int sense_valid = 0;
1831 int sense_deferred = 0;
c98a0eb0 1832 unsigned char op = SCpnt->cmnd[0];
5db44863 1833 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1834
89d94756
HR		 1835 switch (req_op(req)) {
1836 case REQ_OP_DISCARD:
02d26103 1837 case REQ_OP_WRITE_ZEROES:
89d94756
HR		 1838 case REQ_OP_WRITE_SAME:
1839 case REQ_OP_ZONE_RESET:
26e85fcd
MP		 1840 if (!result) {
1841 good_bytes = blk_rq_bytes(req);
1842 scsi_set_resid(SCpnt, 0);
1843 } else {
1844 good_bytes = 0;
1845 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1846 }
89d94756
HR		 1847 break;
1848 case REQ_OP_ZONE_REPORT:
1849 if (!result) {
1850 good_bytes = scsi_bufflen(SCpnt)
1851 - scsi_get_resid(SCpnt);
1852 scsi_set_resid(SCpnt, 0);
1853 } else {
1854 good_bytes = 0;
1855 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1856 }
1857 break;
c46f0917
DLM		 1858 default:
1859 /*
1860 * In case of bogus fw or device, we could end up having
1861 * an unaligned partial completion. Check this here and force
1862 * alignment.
1863 */
1864 resid = scsi_get_resid(SCpnt);
1865 if (resid & (sector_size - 1)) {
1866 sd_printk(KERN_INFO, sdkp,
1867 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1868 resid, sector_size);
1869 resid = min(scsi_bufflen(SCpnt),
1870 round_up(resid, sector_size));
1871 scsi_set_resid(SCpnt, resid);
1872 }
26e85fcd 1873 }
6a32a8ae 1874
1da177e4
LT		 1875 if (result) {
1876 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1877 if (sense_valid)
1878 sense_deferred = scsi_sense_is_deferred(&sshdr);
1879 }
2a863ba8
DJ		 1880 sdkp->medium_access_timed_out = 0;
1881
03aba2f7
LT		 1882 if (driver_byte(result) != DRIVER_SENSE &&
1883 (!sense_valid || sense_deferred))
1884 goto out;
1885
1886 switch (sshdr.sense_key) {
1887 case HARDWARE_ERROR:
1888 case MEDIUM_ERROR:
af55ff67 1889 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1890 break;
1891 case RECOVERED_ERROR:
af55ff67
MP		 1892 good_bytes = scsi_bufflen(SCpnt);
1893 break;
10dab226
JW		 1894 case NO_SENSE:
1895 /* This indicates a false check condition, so ignore it. An
1896 * unknown amount of data was transferred so treat it as an
1897 * error.
1898 */
10dab226
JW		 1899 SCpnt->result = 0;
1900 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1901 break;
c98a0eb0
MP		 1902 case ABORTED_COMMAND:
1903 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1904 good_bytes = sd_completed_bytes(SCpnt);
1905 break;
1906 case ILLEGAL_REQUEST:
1907 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1908 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1909 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1910 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1911 switch (op) {
1912 case UNMAP:
1913 sd_config_discard(sdkp, SD_LBP_DISABLE);
1914 break;
1915 case WRITE_SAME_16:
1916 case WRITE_SAME:
1917 if (unmap)
1918 sd_config_discard(sdkp, SD_LBP_DISABLE);
1919 else {
1920 sdkp->device->no_write_same = 1;
1921 sd_config_write_same(sdkp);
1922
1923 good_bytes = 0;
1924 req->__data_len = blk_rq_bytes(req);
e8064021 1925 req->rq_flags |= RQF_QUIET;
5db44863
MP		 1926 }
1927 }
1928 }
03aba2f7
LT		 1929 break;
1930 default:
1931 break;
1da177e4 1932 }
89d94756 1933
03aba2f7 1934 out:
89d94756
HR		 1935 if (sd_is_zoned(sdkp))
1936 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
1937
ef61329d
HR		 1938 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1939 "sd_done: completed %d of %d bytes\n",
1940 good_bytes, scsi_bufflen(SCpnt)));
1941
af55ff67
MP		 1942 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1943 sd_dif_complete(SCpnt, good_bytes);
1944
7b3d9545 1945 return good_bytes;
1da177e4
LT		 1946}
1947
1da177e4
LT		 1948/*
1949 * spinup disk - called only in sd_revalidate_disk()
1950 */
1951static void
e73aec82 1952sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1953{
1da177e4 1954 unsigned char cmd[10];
4451e472 1955 unsigned long spintime_expire = 0;
1da177e4
LT		 1956 int retries, spintime;
1957 unsigned int the_result;
1958 struct scsi_sense_hdr sshdr;
1959 int sense_valid = 0;
1960
1961 spintime = 0;
1962
1963 /* Spin up drives, as required. Only do this at boot time */
1964 /* Spinup needs to be done for module loads too. */
1965 do {
1966 retries = 0;
1967
1968 do {
1969 cmd[0] = TEST_UNIT_READY;
1970 memset((void *) &cmd[1], 0, 9);
1971
ea73a9f2
JB		 1972 the_result = scsi_execute_req(sdkp->device, cmd,
1973 DMA_NONE, NULL, 0,
1974 &sshdr, SD_TIMEOUT,
f4f4e47e 1975 SD_MAX_RETRIES, NULL);
1da177e4 1976
b4d38e38
AS		 1977 /*
1978 * If the drive has indicated to us that it
1979 * doesn't have any media in it, don't bother
1980 * with any more polling.
1981 */
1982 if (media_not_present(sdkp, &sshdr))
1983 return;
1984
1da177e4 1985 if (the_result)
ea73a9f2 1986 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1987 retries++;
1988 } while (retries < 3 &&
1989 (!scsi_status_is_good(the_result) ||
1990 ((driver_byte(the_result) & DRIVER_SENSE) &&
1991 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1992
1da177e4
LT		 1993 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1994 /* no sense, TUR either succeeded or failed
1995 * with a status error */
e73aec82 1996 if(!spintime && !scsi_status_is_good(the_result)) {
ef61329d
HR		 1997 sd_print_result(sdkp, "Test Unit Ready failed",
1998 the_result);
e73aec82 1999 }
1da177e4
LT		 2000 break;
2001 }
ef61329d 2002
1da177e4
LT		 2003 /*
2004 * The device does not want the automatic start to be issued.
2005 */
33dd6f92 2006 if (sdkp->device->no_start_on_add)
1da177e4 2007 break;
1da177e4 2008
33dd6f92
MW		 2009 if (sense_valid && sshdr.sense_key == NOT_READY) {
2010 if (sshdr.asc == 4 && sshdr.ascq == 3)
2011 break; /* manual intervention required */
2012 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2013 break; /* standby */
2014 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2015 break; /* unavailable */
2016 /*
2017 * Issue command to spin up drive when not ready
2018 */
1da177e4 2019 if (!spintime) {
e73aec82 2020 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 2021 cmd[0] = START_STOP;
2022 cmd[1] = 1; /* Return immediately */
2023 memset((void *) &cmd[2], 0, 8);
2024 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 2025 if (sdkp->device->start_stop_pwr_cond)
2026 cmd[4] |= 1 << 4;
ea73a9f2
JB		 2027 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2028 NULL, 0, &sshdr,
f4f4e47e
FT		 2029 SD_TIMEOUT, SD_MAX_RETRIES,
2030 NULL);
4451e472
AS		 2031 spintime_expire = jiffies + 100 * HZ;
2032 spintime = 1;
1da177e4 2033 }
1da177e4
LT		 2034 /* Wait 1 second for next try */
2035 msleep(1000);
2036 printk(".");
4451e472
AS		 2037
2038 /*
2039 * Wait for USB flash devices with slow firmware.
2040 * Yes, this sense key/ASC combination shouldn't
2041 * occur here. It's characteristic of these devices.
2042 */
2043 } else if (sense_valid &&
2044 sshdr.sense_key == UNIT_ATTENTION &&
2045 sshdr.asc == 0x28) {
2046 if (!spintime) {
2047 spintime_expire = jiffies + 5 * HZ;
2048 spintime = 1;
2049 }
2050 /* Wait 1 second for next try */
2051 msleep(1000);
1da177e4
LT		 2052 } else {
2053 /* we don't understand the sense code, so it's
2054 * probably pointless to loop */
2055 if(!spintime) {
e73aec82
MP		 2056 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2057 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 2058 }
2059 break;
2060 }
2061
4451e472 2062 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 2063
2064 if (spintime) {
2065 if (scsi_status_is_good(the_result))
2066 printk("ready\n");
2067 else
2068 printk("not responding...\n");
2069 }
2070}
2071
e0597d70
MP		 2072/*
2073 * Determine whether disk supports Data Integrity Field.
2074 */
fe542396 2075static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2076{
2077 struct scsi_device *sdp = sdkp->device;
2078 u8 type;
fe542396 2079 int ret = 0;
e0597d70
MP		 2080
2081 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 2082 return ret;
35e1a5d9
MP		 2083
2084 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2085
8475c811 2086 if (type > T10_PI_TYPE3_PROTECTION)
fe542396
MP		 2087 ret = -ENODEV;
2088 else if (scsi_host_dif_capable(sdp->host, type))
2089 ret = 1;
2090
2091 if (sdkp->first_scan || type != sdkp->protection_type)
2092 switch (ret) {
2093 case -ENODEV:
2094 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2095 " protection type %u. Disabling disk!\n",
2096 type);
2097 break;
2098 case 1:
2099 sd_printk(KERN_NOTICE, sdkp,
2100 "Enabling DIF Type %u protection\n", type);
2101 break;
2102 case 0:
2103 sd_printk(KERN_NOTICE, sdkp,
2104 "Disabling DIF Type %u protection\n", type);
2105 break;
2106 }
e0597d70 2107
be922f47
MP		 2108 sdkp->protection_type = type;
2109
fe542396 2110 return ret;
e0597d70
MP		 2111}
2112
0da205e0
MW		 2113static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2114 struct scsi_sense_hdr *sshdr, int sense_valid,
2115 int the_result)
2116{
0da205e0
MW		 2117 if (driver_byte(the_result) & DRIVER_SENSE)
2118 sd_print_sense_hdr(sdkp, sshdr);
2119 else
2120 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2121
2122 /*
2123 * Set dirty bit for removable devices if not ready -
2124 * sometimes drives will not report this properly.
2125 */
2126 if (sdp->removable &&
2127 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 2128 set_media_not_present(sdkp);
0da205e0
MW		 2129
2130 /*
2131 * We used to set media_present to 0 here to indicate no media
2132 * in the drive, but some drives fail read capacity even with
2133 * media present, so we can't do that.
2134 */
2135 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2136}
2137
2138#define RC16_LEN 32
2139#if RC16_LEN > SD_BUF_SIZE
2140#error RC16_LEN must not be more than SD_BUF_SIZE
2141#endif
2142
3233ac19
JB		 2143#define READ_CAPACITY_RETRIES_ON_RESET 10
2144
0da205e0
MW		 2145static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2146 unsigned char *buffer)
ea73a9f2 2147{
1da177e4 2148 unsigned char cmd[16];
1da177e4
LT		 2149 struct scsi_sense_hdr sshdr;
2150 int sense_valid = 0;
0da205e0 2151 int the_result;
3233ac19 2152 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 2153 unsigned int alignment;
0da205e0
MW		 2154 unsigned long long lba;
2155 unsigned sector_size;
1da177e4 2156
5ce524bd
HG		 2157 if (sdp->no_read_capacity_16)
2158 return -EINVAL;
2159
1da177e4 2160 do {
0da205e0 2161 memset(cmd, 0, 16);
eb846d9f 2162 cmd[0] = SERVICE_ACTION_IN_16;
0da205e0
MW		 2163 cmd[1] = SAI_READ_CAPACITY_16;
2164 cmd[13] = RC16_LEN;
2165 memset(buffer, 0, RC16_LEN);
2166
ea73a9f2 2167 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 2168 buffer, RC16_LEN, &sshdr,
2169 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 2170
ea73a9f2 2171 if (media_not_present(sdkp, &sshdr))
0da205e0 2172 return -ENODEV;
1da177e4 2173
2b301307 2174 if (the_result) {
ea73a9f2 2175 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 2176 if (sense_valid &&
2177 sshdr.sense_key == ILLEGAL_REQUEST &&
2178 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2179 sshdr.ascq == 0x00)
2180 /* Invalid Command Operation Code or
2181 * Invalid Field in CDB, just retry
2182 * silently with RC10 */
2183 return -EINVAL;
3233ac19
JB		 2184 if (sense_valid &&
2185 sshdr.sense_key == UNIT_ATTENTION &&
2186 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2187 /* Device reset might occur several times,
2188 * give it one more chance */
2189 if (--reset_retries > 0)
2190 continue;
2b301307 2191 }
1da177e4
LT		 2192 retries--;
2193
2194 } while (the_result && retries);
2195
0da205e0 2196 if (the_result) {
ef61329d 2197 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
0da205e0
MW		 2198 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2199 return -EINVAL;
2200 }
e73aec82 2201
8f76d151
DH		 2202 sector_size = get_unaligned_be32(&buffer[8]);
2203 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2204
fe542396
MP		 2205 if (sd_read_protection_type(sdkp, buffer) < 0) {
2206 sdkp->capacity = 0;
2207 return -ENODEV;
2208 }
0da205e0
MW		 2209
2210 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2211 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2212 "kernel compiled with support for large block "
2213 "devices.\n");
2214 sdkp->capacity = 0;
2215 return -EOVERFLOW;
2216 }
2217
ea09bcc9 2218 /* Logical blocks per physical block exponent */
526f7c79 2219 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9 2220
89d94756
HR		 2221 /* RC basis */
2222 sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2223
ea09bcc9
MP		 2224 /* Lowest aligned logical block */
2225 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2226 blk_queue_alignment_offset(sdp->request_queue, alignment);
2227 if (alignment && sdkp->first_scan)
2228 sd_printk(KERN_NOTICE, sdkp,
2229 "physical block alignment offset: %u\n", alignment);
2230
c98a0eb0
MP		 2231 if (buffer[14] & 0x80) { /* LBPME */
2232 sdkp->lbpme = 1;
e339c1a7 2233
c98a0eb0
MP		 2234 if (buffer[14] & 0x40) /* LBPRZ */
2235 sdkp->lbprz = 1;
e339c1a7 2236
c98a0eb0 2237 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2238 }
2239
0da205e0
MW		 2240 sdkp->capacity = lba + 1;
2241 return sector_size;
2242}
2243
2244static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2245 unsigned char *buffer)
2246{
2247 unsigned char cmd[16];
2248 struct scsi_sense_hdr sshdr;
2249 int sense_valid = 0;
2250 int the_result;
3233ac19 2251 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2252 sector_t lba;
2253 unsigned sector_size;
2254
2255 do {
2256 cmd[0] = READ_CAPACITY;
2257 memset(&cmd[1], 0, 9);
2258 memset(buffer, 0, 8);
2259
2260 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2261 buffer, 8, &sshdr,
2262 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2263
2264 if (media_not_present(sdkp, &sshdr))
2265 return -ENODEV;
2266
3233ac19 2267 if (the_result) {
0da205e0 2268 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2269 if (sense_valid &&
2270 sshdr.sense_key == UNIT_ATTENTION &&
2271 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2272 /* Device reset might occur several times,
2273 * give it one more chance */
2274 if (--reset_retries > 0)
2275 continue;
2276 }
0da205e0
MW		 2277 retries--;
2278
2279 } while (the_result && retries);
2280
2281 if (the_result) {
ef61329d 2282 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
0da205e0
MW		 2283 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2284 return -EINVAL;
2285 }
2286
8f76d151
DH		 2287 sector_size = get_unaligned_be32(&buffer[4]);
2288 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2289
5ce524bd
HG		 2290 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2291 /* Some buggy (usb cardreader) devices return an lba of
2292 0xffffffff when the want to report a size of 0 (with
2293 which they really mean no media is present) */
2294 sdkp->capacity = 0;
5cc10350 2295 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2296 return sector_size;
2297 }
2298
0da205e0
MW		 2299 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2300 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2301 "kernel compiled with support for large block "
2302 "devices.\n");
2303 sdkp->capacity = 0;
2304 return -EOVERFLOW;
2305 }
2306
2307 sdkp->capacity = lba + 1;
526f7c79 2308 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2309 return sector_size;
2310}
2311
2b301307
MW		 2312static int sd_try_rc16_first(struct scsi_device *sdp)
2313{
f87146bb
HR		 2314 if (sdp->host->max_cmd_len < 16)
2315 return 0;
6a0bdffa
AS		 2316 if (sdp->try_rc_10_first)
2317 return 0;
2b301307
MW		 2318 if (sdp->scsi_level > SCSI_SPC_2)
2319 return 1;
2320 if (scsi_device_protection(sdp))
2321 return 1;
2322 return 0;
2323}
2324
0da205e0
MW		 2325/*
2326 * read disk capacity
2327 */
2328static void
2329sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2330{
2331 int sector_size;
2332 struct scsi_device *sdp = sdkp->device;
2333
2b301307 2334 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2335 sector_size = read_capacity_16(sdkp, sdp, buffer);
2336 if (sector_size == -EOVERFLOW)
1da177e4 2337 goto got_data;
2b301307
MW		 2338 if (sector_size == -ENODEV)
2339 return;
2340 if (sector_size < 0)
2341 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2342 if (sector_size < 0)
2343 return;
1da177e4 2344 } else {
0da205e0
MW		 2345 sector_size = read_capacity_10(sdkp, sdp, buffer);
2346 if (sector_size == -EOVERFLOW)
2347 goto got_data;
2348 if (sector_size < 0)
2349 return;
2350 if ((sizeof(sdkp->capacity) > 4) &&
2351 (sdkp->capacity > 0xffffffffULL)) {
2352 int old_sector_size = sector_size;
2353 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2354 "Trying to use READ CAPACITY(16).\n");
2355 sector_size = read_capacity_16(sdkp, sdp, buffer);
2356 if (sector_size < 0) {
2357 sd_printk(KERN_NOTICE, sdkp,
2358 "Using 0xffffffff as device size\n");
2359 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2360 sector_size = old_sector_size;
2361 goto got_data;
2362 }
2363 }
2364 }
1da177e4 2365
5c211caa
AS		 2366 /* Some devices are known to return the total number of blocks,
2367 * not the highest block number. Some devices have versions
2368 * which do this and others which do not. Some devices we might
2369 * suspect of doing this but we don't know for certain.
2370 *
2371 * If we know the reported capacity is wrong, decrement it. If
2372 * we can only guess, then assume the number of blocks is even
2373 * (usually true but not always) and err on the side of lowering
2374 * the capacity.
2375 */
2376 if (sdp->fix_capacity ||
2377 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2378 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2379 "from its reported value: %llu\n",
2380 (unsigned long long) sdkp->capacity);
1da177e4 2381 --sdkp->capacity;
61bf54b7
ON		 2382 }
2383
1da177e4
LT		 2384got_data:
2385 if (sector_size == 0) {
2386 sector_size = 512;
e73aec82
MP		 2387 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2388 "assuming 512.\n");
1da177e4
LT		 2389 }
2390
2391 if (sector_size != 512 &&
2392 sector_size != 1024 &&
2393 sector_size != 2048 &&
74856fbf 2394 sector_size != 4096) {
e73aec82
MP		 2395 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2396 sector_size);
1da177e4
LT		 2397 /*
2398 * The user might want to re-format the drive with
2399 * a supported sectorsize. Once this happens, it
2400 * would be relatively trivial to set the thing up.
2401 * For this reason, we leave the thing in the table.
2402 */
2403 sdkp->capacity = 0;
2404 /*
2405 * set a bogus sector size so the normal read/write
2406 * logic in the block layer will eventually refuse any
2407 * request on this device without tripping over power
2408 * of two sector size assumptions
2409 */
2410 sector_size = 512;
2411 }
e1defc4f 2412 blk_queue_logical_block_size(sdp->request_queue, sector_size);
89d94756
HR		 2413 blk_queue_physical_block_size(sdp->request_queue,
2414 sdkp->physical_block_size);
2415 sdkp->device->sector_size = sector_size;
7404ad3b 2416
89d94756
HR		 2417 if (sdkp->capacity > 0xffffffff)
2418 sdp->use_16_for_rw = 1;
1da177e4 2419
89d94756 2420}
1da177e4 2421
89d94756
HR		 2422/*
2423 * Print disk capacity
2424 */
2425static void
2426sd_print_capacity(struct scsi_disk *sdkp,
2427 sector_t old_capacity)
2428{
2429 int sector_size = sdkp->device->sector_size;
2430 char cap_str_2[10], cap_str_10[10];
ea09bcc9 2431
89d94756
HR		 2432 string_get_size(sdkp->capacity, sector_size,
2433 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2434 string_get_size(sdkp->capacity, sector_size,
2435 STRING_UNITS_10, cap_str_10,
2436 sizeof(cap_str_10));
1da177e4 2437
89d94756
HR		 2438 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2439 sd_printk(KERN_NOTICE, sdkp,
2440 "%llu %d-byte logical blocks: (%s/%s)\n",
2441 (unsigned long long)sdkp->capacity,
2442 sector_size, cap_str_10, cap_str_2);
53ad570b 2443
89d94756
HR		 2444 if (sdkp->physical_block_size != sector_size)
2445 sd_printk(KERN_NOTICE, sdkp,
2446 "%u-byte physical blocks\n",
2447 sdkp->physical_block_size);
2448
2449 sd_zbc_print_zones(sdkp);
2450 }
1da177e4
LT		 2451}
2452
2453/* called with buffer of length 512 */
2454static inline int
ea73a9f2
JB		 2455sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2456 unsigned char *buffer, int len, struct scsi_mode_data *data,
2457 struct scsi_sense_hdr *sshdr)
1da177e4 2458{
ea73a9f2 2459 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2460 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2461 sshdr);
1da177e4
LT		 2462}
2463
2464/*
2465 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2466 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2467 */
2468static void
e73aec82 2469sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2470{
1da177e4 2471 int res;
ea73a9f2 2472 struct scsi_device *sdp = sdkp->device;
1da177e4 2473 struct scsi_mode_data data;
70a9b873 2474 int old_wp = sdkp->write_prot;
1da177e4
LT		 2475
2476 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2477 if (sdp->skip_ms_page_3f) {
b2bff6ce 2478 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2479 return;
2480 }
2481
ea73a9f2
JB		 2482 if (sdp->use_192_bytes_for_3f) {
2483 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2484 } else {
2485 /*
2486 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2487 * We have to start carefully: some devices hang if we ask
2488 * for more than is available.
2489 */
ea73a9f2 2490 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2491
2492 /*
2493 * Second attempt: ask for page 0 When only page 0 is
2494 * implemented, a request for page 3F may return Sense Key
2495 * 5: Illegal Request, Sense Code 24: Invalid field in
2496 * CDB.
2497 */
2498 if (!scsi_status_is_good(res))
ea73a9f2 2499 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2500
2501 /*
2502 * Third attempt: ask 255 bytes, as we did earlier.
2503 */
2504 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2505 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2506 &data, NULL);
1da177e4
LT		 2507 }
2508
2509 if (!scsi_status_is_good(res)) {
b2bff6ce 2510 sd_first_printk(KERN_WARNING, sdkp,
e73aec82 2511 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2512 } else {
2513 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2514 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2515 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2516 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2517 sdkp->write_prot ? "on" : "off");
df441cc0 2518 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
70a9b873 2519 }
1da177e4
LT		 2520 }
2521}
2522
2523/*
2524 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2525 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2526 */
2527static void
e73aec82 2528sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2529{
1da177e4 2530 int len = 0, res;
ea73a9f2 2531 struct scsi_device *sdp = sdkp->device;
1da177e4 2532
631e8a13
AV		 2533 int dbd;
2534 int modepage;
0bcaa111 2535 int first_len;
1da177e4
LT		 2536 struct scsi_mode_data data;
2537 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2538 int old_wce = sdkp->WCE;
2539 int old_rcd = sdkp->RCD;
2540 int old_dpofua = sdkp->DPOFUA;
1da177e4 2541
39c60a09
JB		 2542
2543 if (sdkp->cache_override)
2544 return;
2545
0bcaa111
LT		 2546 first_len = 4;
2547 if (sdp->skip_ms_page_8) {
2548 if (sdp->type == TYPE_RBC)
2549 goto defaults;
2550 else {
2551 if (sdp->skip_ms_page_3f)
2552 goto defaults;
2553 modepage = 0x3F;
2554 if (sdp->use_192_bytes_for_3f)
2555 first_len = 192;
2556 dbd = 0;
2557 }
2558 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2559 modepage = 6;
2560 dbd = 8;
2561 } else {
2562 modepage = 8;
2563 dbd = 0;
2564 }
2565
1da177e4 2566 /* cautiously ask */
0bcaa111
LT		 2567 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2568 &data, &sshdr);
1da177e4
LT		 2569
2570 if (!scsi_status_is_good(res))
2571 goto bad_sense;
2572
6d73c851
AV		 2573 if (!data.header_length) {
2574 modepage = 6;
0bcaa111 2575 first_len = 0;
b2bff6ce
MP		 2576 sd_first_printk(KERN_ERR, sdkp,
2577 "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2578 }
2579
1da177e4
LT		 2580 /* that went OK, now ask for the proper length */
2581 len = data.length;
2582
2583 /*
2584 * We're only interested in the first three bytes, actually.
2585 * But the data cache page is defined for the first 20.
2586 */
2587 if (len < 3)
2588 goto bad_sense;
0bcaa111 2589 else if (len > SD_BUF_SIZE) {
b2bff6ce 2590 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
0bcaa111
LT		 2591 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2592 len = SD_BUF_SIZE;
2593 }
2594 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2595 len = 192;
1da177e4
LT		 2596
2597 /* Get the data */
0bcaa111
LT		 2598 if (len > first_len)
2599 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2600 &data, &sshdr);
1da177e4
LT		 2601
2602 if (scsi_status_is_good(res)) {
631e8a13 2603 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2604
0bcaa111
LT		 2605 while (offset < len) {
2606 u8 page_code = buffer[offset] & 0x3F;
2607 u8 spf = buffer[offset] & 0x40;
2608
2609 if (page_code == 8 || page_code == 6) {
2610 /* We're interested only in the first 3 bytes.
2611 */
2612 if (len - offset <= 2) {
b2bff6ce
MP		 2613 sd_first_printk(KERN_ERR, sdkp,
2614 "Incomplete mode parameter "
2615 "data\n");
0bcaa111
LT		 2616 goto defaults;
2617 } else {
2618 modepage = page_code;
2619 goto Page_found;
2620 }
2621 } else {
2622 /* Go to the next page */
2623 if (spf && len - offset > 3)
2624 offset += 4 + (buffer[offset+2] << 8) +
2625 buffer[offset+3];
2626 else if (!spf && len - offset > 1)
2627 offset += 2 + buffer[offset+1];
2628 else {
b2bff6ce
MP		 2629 sd_first_printk(KERN_ERR, sdkp,
2630 "Incomplete mode "
2631 "parameter data\n");
0bcaa111
LT		 2632 goto defaults;
2633 }
2634 }
48970800
AV		 2635 }
2636
b2bff6ce 2637 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
984f1733
AS		 2638 goto defaults;
2639
0bcaa111 2640 Page_found:
631e8a13
AV		 2641 if (modepage == 8) {
2642 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2643 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2644 } else {
2645 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2646 sdkp->RCD = 0;
2647 }
1da177e4 2648
007365ad 2649 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
b14bf2d0
AS		 2650 if (sdp->broken_fua) {
2651 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2652 sdkp->DPOFUA = 0;
26f28197
DLM		 2653 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2654 !sdkp->device->use_16_for_rw) {
b2bff6ce 2655 sd_first_printk(KERN_NOTICE, sdkp,
e73aec82 2656 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2657 sdkp->DPOFUA = 0;
2658 }
2659
2eefd57b
SRT		 2660 /* No cache flush allowed for write protected devices */
2661 if (sdkp->WCE && sdkp->write_prot)
2662 sdkp->WCE = 0;
2663
70a9b873
MP		 2664 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2665 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2666 sd_printk(KERN_NOTICE, sdkp,
2667 "Write cache: %s, read cache: %s, %s\n",
2668 sdkp->WCE ? "enabled" : "disabled",
2669 sdkp->RCD ? "disabled" : "enabled",
2670 sdkp->DPOFUA ? "supports DPO and FUA"
2671 : "doesn't support DPO or FUA");
1da177e4
LT		 2672
2673 return;
2674 }
2675
2676bad_sense:
ea73a9f2 2677 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2678 sshdr.sense_key == ILLEGAL_REQUEST &&
2679 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82 2680 /* Invalid field in CDB */
b2bff6ce 2681 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2682 else
b2bff6ce
MP		 2683 sd_first_printk(KERN_ERR, sdkp,
2684 "Asking for cache data failed\n");
1da177e4
LT		 2685
2686defaults:
b81478d8 2687 if (sdp->wce_default_on) {
b2bff6ce
MP		 2688 sd_first_printk(KERN_NOTICE, sdkp,
2689 "Assuming drive cache: write back\n");
b81478d8
NJ		 2690 sdkp->WCE = 1;
2691 } else {
b2bff6ce
MP		 2692 sd_first_printk(KERN_ERR, sdkp,
2693 "Assuming drive cache: write through\n");
b81478d8
NJ		 2694 sdkp->WCE = 0;
2695 }
1da177e4 2696 sdkp->RCD = 0;
48970800 2697 sdkp->DPOFUA = 0;
1da177e4
LT		 2698}
2699
e0597d70
MP		 2700/*
2701 * The ATO bit indicates whether the DIF application tag is available
2702 * for use by the operating system.
2703 */
439d77f7 2704static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2705{
2706 int res, offset;
2707 struct scsi_device *sdp = sdkp->device;
2708 struct scsi_mode_data data;
2709 struct scsi_sense_hdr sshdr;
2710
89d94756 2711 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
e0597d70
MP		 2712 return;
2713
2714 if (sdkp->protection_type == 0)
2715 return;
2716
2717 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2718 SD_MAX_RETRIES, &data, &sshdr);
2719
2720 if (!scsi_status_is_good(res) || !data.header_length ||
2721 data.length < 6) {
b2bff6ce 2722 sd_first_printk(KERN_WARNING, sdkp,
e0597d70
MP		 2723 "getting Control mode page failed, assume no ATO\n");
2724
2725 if (scsi_sense_valid(&sshdr))
2726 sd_print_sense_hdr(sdkp, &sshdr);
2727
2728 return;
2729 }
2730
2731 offset = data.header_length + data.block_descriptor_length;
2732
2733 if ((buffer[offset] & 0x3f) != 0x0a) {
b2bff6ce 2734 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
e0597d70
MP		 2735 return;
2736 }
2737
2738 if ((buffer[offset + 5] & 0x80) == 0)
2739 return;
2740
2741 sdkp->ATO = 1;
2742
2743 return;
2744}
2745
d11b6916
MP		 2746/**
2747 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2748 * @disk: disk to query
2749 */
2750static void sd_read_block_limits(struct scsi_disk *sdkp)
2751{
2752 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2753 const int vpd_len = 64;
e3deec09 2754 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2755
e3deec09
JB		 2756 if (!buffer ||
2757 /* Block Limits VPD */
2758 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2759 goto out;
d11b6916
MP		 2760
2761 blk_queue_io_min(sdkp->disk->queue,
2762 get_unaligned_be16(&buffer[6]) * sector_sz);
ca369d51
MP		 2763
2764 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2765 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
d11b6916 2766
c98a0eb0
MP		 2767 if (buffer[3] == 0x3c) {
2768 unsigned int lba_count, desc_count;
e339c1a7 2769
5db44863 2770 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2771
c98a0eb0 2772 if (!sdkp->lbpme)
045d3fe7 2773 goto out;
045d3fe7 2774
c98a0eb0
MP		 2775 lba_count = get_unaligned_be32(&buffer[20]);
2776 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2777
c98a0eb0
MP		 2778 if (lba_count && desc_count)
2779 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2780
c98a0eb0 2781 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2782
2783 if (buffer[32] & 0x80)
c98a0eb0 2784 sdkp->unmap_alignment =
e339c1a7 2785 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2786
2787 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2788
2789 if (sdkp->max_unmap_blocks)
2790 sd_config_discard(sdkp, SD_LBP_UNMAP);
2791 else
2792 sd_config_discard(sdkp, SD_LBP_WS16);
2793
2794 } else { /* LBP VPD page tells us what to use */
e461338b
MP		 2795 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2796 sd_config_discard(sdkp, SD_LBP_UNMAP);
2797 else if (sdkp->lbpws)
c98a0eb0
MP		 2798 sd_config_discard(sdkp, SD_LBP_WS16);
2799 else if (sdkp->lbpws10)
2800 sd_config_discard(sdkp, SD_LBP_WS10);
7985090a
MP		 2801 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2802 sd_config_discard(sdkp, SD_LBP_UNMAP);
c98a0eb0
MP		 2803 else
2804 sd_config_discard(sdkp, SD_LBP_DISABLE);
2805 }
e339c1a7
MP		 2806 }
2807
e3deec09 2808 out:
d11b6916
MP		 2809 kfree(buffer);
2810}
2811
3821d768
MP		 2812/**
2813 * sd_read_block_characteristics - Query block dev. characteristics
2814 * @disk: disk to query
2815 */
2816static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2817{
89d94756 2818 struct request_queue *q = sdkp->disk->queue;
e3deec09 2819 unsigned char *buffer;
3821d768 2820 u16 rot;
bb2d3de1 2821 const int vpd_len = 64;
3821d768 2822
e3deec09 2823 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2824
e3deec09
JB		 2825 if (!buffer ||
2826 /* Block Device Characteristics VPD */
2827 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2828 goto out;
3821d768
MP		 2829
2830 rot = get_unaligned_be16(&buffer[4]);
2831
b277da0a 2832 if (rot == 1) {
89d94756
HR		 2833 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2834 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
b277da0a 2835 }
3821d768 2836
68af412c
DLM		 2837 if (sdkp->device->type == TYPE_ZBC) {
2838 /* Host-managed */
89d94756 2839 q->limits.zoned = BLK_ZONED_HM;
68af412c
DLM		 2840 } else {
2841 sdkp->zoned = (buffer[8] >> 4) & 3;
2842 if (sdkp->zoned == 1)
2843 /* Host-aware */
2844 q->limits.zoned = BLK_ZONED_HA;
2845 else
2846 /*
2847 * Treat drive-managed devices as
2848 * regular block devices.
2849 */
2850 q->limits.zoned = BLK_ZONED_NONE;
2851 }
89d94756
HR		 2852 if (blk_queue_is_zoned(q) && sdkp->first_scan)
2853 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2854 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2855
e3deec09 2856 out:
3821d768
MP		 2857 kfree(buffer);
2858}
2859
045d3fe7 2860/**
c98a0eb0 2861 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2862 * @disk: disk to query
2863 */
c98a0eb0 2864static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2865{
2866 unsigned char *buffer;
2867 const int vpd_len = 8;
2868
c98a0eb0 2869 if (sdkp->lbpme == 0)
045d3fe7
MP		 2870 return;
2871
2872 buffer = kmalloc(vpd_len, GFP_KERNEL);
2873
2874 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2875 goto out;
2876
c98a0eb0
MP		 2877 sdkp->lbpvpd = 1;
2878 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2879 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2880 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2881
2882 out:
2883 kfree(buffer);
2884}
2885
5db44863
MP		 2886static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2887{
66c28f97
MP		 2888 struct scsi_device *sdev = sdkp->device;
2889
54b2b50c
MP		 2890 if (sdev->host->no_write_same) {
2891 sdev->no_write_same = 1;
2892
2893 return;
2894 }
2895
66c28f97 2896 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af73623f
BS		 2897 /* too large values might cause issues with arcmsr */
2898 int vpd_buf_len = 64;
2899
66c28f97
MP		 2900 sdev->no_report_opcodes = 1;
2901
2902 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2903 * CODES is unsupported and the device has an ATA
2904 * Information VPD page (SAT).
2905 */
af73623f 2906 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
66c28f97
MP		 2907 sdev->no_write_same = 1;
2908 }
2909
2910 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2911 sdkp->ws16 = 1;
66c28f97
MP		 2912
2913 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2914 sdkp->ws10 = 1;
5db44863
MP		 2915}
2916
1da177e4
LT		 2917/**
2918 * sd_revalidate_disk - called the first time a new disk is seen,
2919 * performs disk spin up, read_capacity, etc.
2920 * @disk: struct gendisk we care about
2921 **/
2922static int sd_revalidate_disk(struct gendisk *disk)
2923{
2924 struct scsi_disk *sdkp = scsi_disk(disk);
2925 struct scsi_device *sdp = sdkp->device;
ca369d51 2926 struct request_queue *q = sdkp->disk->queue;
89d94756 2927 sector_t old_capacity = sdkp->capacity;
1da177e4 2928 unsigned char *buffer;
ca369d51 2929 unsigned int dev_max, rw_max;
1da177e4 2930
fa0d34be
MP		 2931 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2932 "sd_revalidate_disk\n"));
1da177e4
LT		 2933
2934 /*
2935 * If the device is offline, don't try and read capacity or any
2936 * of the other niceties.
2937 */
2938 if (!scsi_device_online(sdp))
2939 goto out;
2940
a6123f14 2941 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2942 if (!buffer) {
e73aec82
MP		 2943 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2944 "allocation failure.\n");
ea73a9f2 2945 goto out;
1da177e4
LT		 2946 }
2947
e73aec82 2948 sd_spinup_disk(sdkp);
1da177e4
LT		 2949
2950 /*
2951 * Without media there is no reason to ask; moreover, some devices
2952 * react badly if we do.
2953 */
2954 if (sdkp->media_present) {
e73aec82 2955 sd_read_capacity(sdkp, buffer);
ffd4bc2a 2956
5ddfe085 2957 if (scsi_device_supports_vpd(sdp)) {
c98a0eb0 2958 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2959 sd_read_block_limits(sdkp);
2960 sd_read_block_characteristics(sdkp);
89d94756 2961 sd_zbc_read_zones(sdkp, buffer);
ffd4bc2a
MP		 2962 }
2963
89d94756
HR		 2964 sd_print_capacity(sdkp, old_capacity);
2965
e73aec82
MP		 2966 sd_read_write_protect_flag(sdkp, buffer);
2967 sd_read_cache_type(sdkp, buffer);
e0597d70 2968 sd_read_app_tag_own(sdkp, buffer);
5db44863 2969 sd_read_write_same(sdkp, buffer);
1da177e4 2970 }
461d4e90 2971
70a9b873
MP		 2972 sdkp->first_scan = 0;
2973
461d4e90
TH		 2974 /*
2975 * We now have all cache related info, determine how we deal
4913efe4 2976 * with flush requests.
461d4e90 2977 */
cb2fb68d 2978 sd_set_flush_flag(sdkp);
461d4e90 2979
ca369d51
MP		 2980 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2981 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2982
2983 /* Some devices report a maximum block count for READ/WRITE requests. */
2984 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2985 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2986
2987 /*
2988 * Use the device's preferred I/O size for reads and writes
9c1d9c20
MP		 2989 * unless the reported value is unreasonably small, large, or
2990 * garbage.
ca369d51 2991 */
9c1d9c20
MP		 2992 if (sdkp->opt_xfer_blocks &&
2993 sdkp->opt_xfer_blocks <= dev_max &&
2994 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
6b7e9cde
MP		 2995 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
2996 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2997 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2998 } else
ca369d51 2999 rw_max = BLK_DEF_MAX_SECTORS;
3a9794d3 3000
ca369d51
MP		 3001 /* Combine with controller limits */
3002 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
4f258a46 3003
f08bb1e0 3004 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
5db44863 3005 sd_config_write_same(sdkp);
1da177e4
LT		 3006 kfree(buffer);
3007
1da177e4
LT		 3008 out:
3009 return 0;
3010}
3011
72ec24bd
TH		 3012/**
3013 * sd_unlock_native_capacity - unlock native capacity
3014 * @disk: struct gendisk to set capacity for
3015 *
3016 * Block layer calls this function if it detects that partitions
3017 * on @disk reach beyond the end of the device. If the SCSI host
3018 * implements ->unlock_native_capacity() method, it's invoked to
3019 * give it a chance to adjust the device capacity.
3020 *
3021 * CONTEXT:
3022 * Defined by block layer. Might sleep.
3023 */
3024static void sd_unlock_native_capacity(struct gendisk *disk)
3025{
3026 struct scsi_device *sdev = scsi_disk(disk)->device;
3027
3028 if (sdev->host->hostt->unlock_native_capacity)
3029 sdev->host->hostt->unlock_native_capacity(sdev);
3030}
3031
3e1a7ff8
TH		 3032/**
3033 * sd_format_disk_name - format disk name
3034 * @prefix: name prefix - ie. "sd" for SCSI disks
3035 * @index: index of the disk to format name for
3036 * @buf: output buffer
3037 * @buflen: length of the output buffer
3038 *
3039 * SCSI disk names starts at sda. The 26th device is sdz and the
3040 * 27th is sdaa. The last one for two lettered suffix is sdzz
3041 * which is followed by sdaaa.
3042 *
3043 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 3044 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 3045 * determined using similar method as 26 base conversion with the
3046 * index shifted -1 after each digit is computed.
3047 *
3048 * CONTEXT:
3049 * Don't care.
3050 *
3051 * RETURNS:
3052 * 0 on success, -errno on failure.
3053 */
3054static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3055{
3056 const int base = 'z' - 'a' + 1;
3057 char *begin = buf + strlen(prefix);
3058 char *end = buf + buflen;
3059 char *p;
3060 int unit;
3061
3062 p = end - 1;
3063 *p = '\0';
3064 unit = base;
3065 do {
3066 if (p == begin)
3067 return -EINVAL;
3068 *--p = 'a' + (index % unit);
3069 index = (index / unit) - 1;
3070 } while (index >= 0);
3071
3072 memmove(begin, p, end - p);
3073 memcpy(buf, prefix, strlen(prefix));
3074
3075 return 0;
3076}
3077
4ace92fc
AV		 3078/*
3079 * The asynchronous part of sd_probe
3080 */
3081static void sd_probe_async(void *data, async_cookie_t cookie)
3082{
3083 struct scsi_disk *sdkp = data;
3084 struct scsi_device *sdp;
3085 struct gendisk *gd;
3086 u32 index;
3087 struct device *dev;
3088
3089 sdp = sdkp->device;
3090 gd = sdkp->disk;
3091 index = sdkp->index;
3092 dev = &sdp->sdev_gendev;
3093
1a03ae0f
MR		 3094 gd->major = sd_major((index & 0xf0) >> 4);
3095 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3096 gd->minors = SD_MINORS;
3097
4ace92fc
AV		 3098 gd->fops = &sd_fops;
3099 gd->private_data = &sdkp->driver;
3100 gd->queue = sdkp->device->request_queue;
3101
70a9b873
MP		 3102 /* defaults, until the device tells us otherwise */
3103 sdp->sector_size = 512;
3104 sdkp->capacity = 0;
3105 sdkp->media_present = 1;
3106 sdkp->write_prot = 0;
39c60a09 3107 sdkp->cache_override = 0;
70a9b873
MP		 3108 sdkp->WCE = 0;
3109 sdkp->RCD = 0;
3110 sdkp->ATO = 0;
3111 sdkp->first_scan = 1;
18a4d0a2 3112 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 3113
4ace92fc
AV		 3114 sd_revalidate_disk(gd);
3115
97fedbbe 3116 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 3117 if (sdp->removable) {
4ace92fc 3118 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 3119 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3120 }
4ace92fc 3121
10c580e4 3122 blk_pm_runtime_init(sdp->request_queue, dev);
0d52c756 3123 device_add_disk(dev, gd);
fe542396
MP		 3124 if (sdkp->capacity)
3125 sd_dif_config_host(sdkp);
4ace92fc 3126
3821d768
MP		 3127 sd_revalidate_disk(gd);
3128
4ace92fc
AV		 3129 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3130 sdp->removable ? "removable " : "");
478a8a05 3131 scsi_autopm_put_device(sdp);
ea038f63 3132 put_device(&sdkp->dev);
4ace92fc
AV		 3133}
3134
1da177e4
LT		 3135/**
3136 * sd_probe - called during driver initialization and whenever a
3137 * new scsi device is attached to the system. It is called once
3138 * for each scsi device (not just disks) present.
3139 * @dev: pointer to device object
3140 *
3141 * Returns 0 if successful (or not interested in this scsi device
3142 * (e.g. scanner)); 1 when there is an error.
3143 *
3144 * Note: this function is invoked from the scsi mid-level.
3145 * This function sets up the mapping between a given
3146 * <host,channel,id,lun> (found in sdp) and new device name
3147 * (e.g. /dev/sda). More precisely it is the block device major
3148 * and minor number that is chosen here.
3149 *
2db93ce8
PU		 3150 * Assume sd_probe is not re-entrant (for time being)
3151 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 3152 **/
3153static int sd_probe(struct device *dev)
3154{
3155 struct scsi_device *sdp = to_scsi_device(dev);
3156 struct scsi_disk *sdkp;
3157 struct gendisk *gd;
439d77f7 3158 int index;
1da177e4
LT		 3159 int error;
3160
6fe8c1db 3161 scsi_autopm_get_device(sdp);
1da177e4 3162 error = -ENODEV;
89d94756
HR		 3163 if (sdp->type != TYPE_DISK &&
3164 sdp->type != TYPE_ZBC &&
3165 sdp->type != TYPE_MOD &&
3166 sdp->type != TYPE_RBC)
1da177e4
LT		 3167 goto out;
3168
89d94756
HR		 3169#ifndef CONFIG_BLK_DEV_ZONED
3170 if (sdp->type == TYPE_ZBC)
3171 goto out;
3172#endif
9ccfc756 3173 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 3174 "sd_probe\n"));
1da177e4
LT		 3175
3176 error = -ENOMEM;
24669f75 3177 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 3178 if (!sdkp)
3179 goto out;
3180
689d6fac 3181 gd = alloc_disk(SD_MINORS);
1da177e4 3182 if (!gd)
c01228db 3183 goto out_free;
1da177e4 3184
f27bac27
TH		 3185 do {
3186 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3187 goto out_put;
1da177e4 3188
4034cc68 3189 spin_lock(&sd_index_lock);
f27bac27 3190 error = ida_get_new(&sd_index_ida, &index);
4034cc68 3191 spin_unlock(&sd_index_lock);
f27bac27 3192 } while (error == -EAGAIN);
1da177e4 3193
21208ae5
DK		 3194 if (error) {
3195 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 3196 goto out_put;
1a03ae0f
MR		 3197 }
3198
3e1a7ff8 3199 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 3200 if (error) {
3201 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 3202 goto out_free_index;
21208ae5 3203 }
f27bac27 3204
1da177e4
LT		 3205 sdkp->device = sdp;
3206 sdkp->driver = &sd_template;
3207 sdkp->disk = gd;
3208 sdkp->index = index;
409f3499 3209 atomic_set(&sdkp->openers, 0);
9e1a1537 3210 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 3211
601e7638
JB		 3212 if (!sdp->request_queue->rq_timeout) {
3213 if (sdp->type != TYPE_MOD)
3214 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3215 else
3216 blk_queue_rq_timeout(sdp->request_queue,
3217 SD_MOD_TIMEOUT);
3218 }
3219
3220 device_initialize(&sdkp->dev);
478a8a05 3221 sdkp->dev.parent = dev;
601e7638 3222 sdkp->dev.class = &sd_disk_class;
02aa2a37 3223 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
601e7638 3224
dee0586e
DC		 3225 error = device_add(&sdkp->dev);
3226 if (error)
601e7638
JB		 3227 goto out_free_index;
3228
478a8a05
AS		 3229 get_device(dev);
3230 dev_set_drvdata(dev, sdkp);
601e7638 3231
ea038f63 3232 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 3233 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 3234
3235 return 0;
3236
f27bac27 3237 out_free_index:
c01228db
JK		 3238 spin_lock(&sd_index_lock);
3239 ida_remove(&sd_index_ida, index);
3240 spin_unlock(&sd_index_lock);
6bdaa1f1 3241 out_put:
1da177e4 3242 put_disk(gd);
f170396c
CIK		 3243 out_free:
3244 kfree(sdkp);
6bdaa1f1 3245 out:
6fe8c1db 3246 scsi_autopm_put_device(sdp);
1da177e4
LT		 3247 return error;
3248}
3249
3250/**
3251 * sd_remove - called whenever a scsi disk (previously recognized by
3252 * sd_probe) is detached from the system. It is called (potentially
3253 * multiple times) during sd module unload.
f2a3313d 3254 * @dev: pointer to device object
1da177e4
LT		 3255 *
3256 * Note: this function is invoked from the scsi mid-level.
3257 * This function potentially frees up a device name (e.g. /dev/sdc)
3258 * that could be re-used by a subsequent sd_probe().
3259 * This function is not called when the built-in sd driver is "exit-ed".
3260 **/
3261static int sd_remove(struct device *dev)
3262{
601e7638 3263 struct scsi_disk *sdkp;
0761df9c 3264 dev_t devt;
1da177e4 3265
601e7638 3266 sdkp = dev_get_drvdata(dev);
0761df9c 3267 devt = disk_devt(sdkp->disk);
478a8a05
AS		 3268 scsi_autopm_get_device(sdkp->device);
3269
3c31b52f 3270 async_synchronize_full_domain(&scsi_sd_pm_domain);
a7a20d10 3271 async_synchronize_full_domain(&scsi_sd_probe_domain);
ee959b00 3272 device_del(&sdkp->dev);
1da177e4
LT		 3273 del_gendisk(sdkp->disk);
3274 sd_shutdown(dev);
39b7f1e2 3275
89d94756
HR		 3276 sd_zbc_remove(sdkp);
3277
0761df9c
HR		 3278 blk_register_region(devt, SD_MINORS, NULL,
3279 sd_default_probe, NULL, NULL);
3280
0b950672 3281 mutex_lock(&sd_ref_mutex);
39b7f1e2 3282 dev_set_drvdata(dev, NULL);
ee959b00 3283 put_device(&sdkp->dev);
0b950672 3284 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3285
3286 return 0;
3287}
3288
3289/**
3290 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3291 * @dev: pointer to embedded class device
1da177e4 3292 *
0b950672 3293 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3294 * called on last put, you should always use the scsi_disk_get()
3295 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3296 * and never do a direct put_device.
1da177e4 3297 **/
ee959b00 3298static void scsi_disk_release(struct device *dev)
1da177e4 3299{
ee959b00 3300 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3301 struct gendisk *disk = sdkp->disk;
3302
c01228db
JK		 3303 spin_lock(&sd_index_lock);
3304 ida_remove(&sd_index_ida, sdkp->index);
3305 spin_unlock(&sd_index_lock);
3306
1da177e4 3307 disk->private_data = NULL;
1da177e4 3308 put_disk(disk);
39b7f1e2 3309 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3310
3311 kfree(sdkp);
3312}
3313
cc5d2c8c 3314static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3315{
3316 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3317 struct scsi_sense_hdr sshdr;
cc5d2c8c 3318 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3319 int res;
3320
3321 if (start)
3322 cmd[4] |= 1; /* START */
3323
d2886ea3
SR		 3324 if (sdp->start_stop_pwr_cond)
3325 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3326
c3c94c5a
TH		 3327 if (!scsi_device_online(sdp))
3328 return -ENODEV;
3329
fcbfffe2
CH		 3330 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3331 SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
c3c94c5a 3332 if (res) {
ef61329d 3333 sd_print_result(sdkp, "Start/Stop Unit failed", res);
c3c94c5a 3334 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3335 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 3336 if (scsi_sense_valid(&sshdr) &&
3337 /* 0x3a is medium not present */
3338 sshdr.asc == 0x3a)
3339 res = 0;
c3c94c5a
TH		 3340 }
3341
95897910
ON		 3342 /* SCSI error codes must not go to the generic layer */
3343 if (res)
3344 return -EIO;
3345
3346 return 0;
c3c94c5a
TH		 3347}
3348
1da177e4
LT		 3349/*
3350 * Send a SYNCHRONIZE CACHE instruction down to the device through
3351 * the normal SCSI command structure. Wait for the command to
3352 * complete.
3353 */
3354static void sd_shutdown(struct device *dev)
3355{
3d9a1f53 3356 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1da177e4
LT		 3357
3358 if (!sdkp)
3359 return; /* this can happen */
3360
54f57588 3361 if (pm_runtime_suspended(dev))
3d9a1f53 3362 return;
54f57588 3363
95897910 3364 if (sdkp->WCE && sdkp->media_present) {
e73aec82
MP		 3365 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3366 sd_sync_cache(sdkp);
39b7f1e2 3367 }
c3c94c5a 3368
cc5d2c8c
JB		 3369 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3370 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3371 sd_start_stop_device(sdkp, 0);
c3c94c5a 3372 }
39b7f1e2 3373}
1da177e4 3374
95897910 3375static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
c3c94c5a 3376{
3d9a1f53 3377 struct scsi_disk *sdkp = dev_get_drvdata(dev);
09ff92fe 3378 int ret = 0;
c3c94c5a 3379
13b43891
AS		 3380 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3381 return 0;
c3c94c5a 3382
95897910 3383 if (sdkp->WCE && sdkp->media_present) {
cc5d2c8c 3384 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a 3385 ret = sd_sync_cache(sdkp);
95897910
ON		 3386 if (ret) {
3387 /* ignore OFFLINE device */
3388 if (ret == -ENODEV)
3389 ret = 0;
09ff92fe 3390 goto done;
95897910 3391 }
c3c94c5a
TH		 3392 }
3393
691e3d31 3394 if (sdkp->device->manage_start_stop) {
cc5d2c8c 3395 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
95897910 3396 /* an error is not worth aborting a system sleep */
cc5d2c8c 3397 ret = sd_start_stop_device(sdkp, 0);
95897910
ON		 3398 if (ignore_stop_errors)
3399 ret = 0;
c3c94c5a
TH		 3400 }
3401
09ff92fe 3402done:
09ff92fe 3403 return ret;
c3c94c5a
TH		 3404}
3405
95897910
ON		 3406static int sd_suspend_system(struct device *dev)
3407{
3408 return sd_suspend_common(dev, true);
3409}
3410
3411static int sd_suspend_runtime(struct device *dev)
3412{
3413 return sd_suspend_common(dev, false);
3414}
3415
c3c94c5a
TH		 3416static int sd_resume(struct device *dev)
3417{
3d9a1f53 3418 struct scsi_disk *sdkp = dev_get_drvdata(dev);
c3c94c5a 3419
13b43891
AS		 3420 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3421 return 0;
3422
cc5d2c8c 3423 if (!sdkp->device->manage_start_stop)
3d9a1f53 3424 return 0;
c3c94c5a 3425
cc5d2c8c 3426 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3d9a1f53 3427 return sd_start_stop_device(sdkp, 1);
c3c94c5a
TH		 3428}
3429
1da177e4
LT		 3430/**
3431 * init_sd - entry point for this driver (both when built in or when
3432 * a module).
3433 *
3434 * Note: this function registers this driver with the scsi mid-level.
3435 **/
3436static int __init init_sd(void)
3437{
5e4009ba 3438 int majors = 0, i, err;
1da177e4
LT		 3439
3440 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3441
0761df9c
HR		 3442 for (i = 0; i < SD_MAJORS; i++) {
3443 if (register_blkdev(sd_major(i), "sd") != 0)
3444 continue;
3445 majors++;
3446 blk_register_region(sd_major(i), SD_MINORS, NULL,
3447 sd_default_probe, NULL, NULL);
3448 }
1da177e4
LT		 3449
3450 if (!majors)
3451 return -ENODEV;
3452
5e4009ba
JG		 3453 err = class_register(&sd_disk_class);
3454 if (err)
3455 goto err_out;
6bdaa1f1 3456
4e7392ec
MP		 3457 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3458 0, 0, NULL);
3459 if (!sd_cdb_cache) {
3460 printk(KERN_ERR "sd: can't init extended cdb cache\n");
8d964478 3461 err = -ENOMEM;
4e7392ec
MP		 3462 goto err_out_class;
3463 }
3464
3465 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3466 if (!sd_cdb_pool) {
3467 printk(KERN_ERR "sd: can't init extended cdb pool\n");
8d964478 3468 err = -ENOMEM;
4e7392ec
MP		 3469 goto err_out_cache;
3470 }
3471
afd5e34b
JD		 3472 err = scsi_register_driver(&sd_template.gendrv);
3473 if (err)
3474 goto err_out_driver;
3475
5e4009ba
JG		 3476 return 0;
3477
afd5e34b
JD		 3478err_out_driver:
3479 mempool_destroy(sd_cdb_pool);
3480
4e7392ec
MP		 3481err_out_cache:
3482 kmem_cache_destroy(sd_cdb_cache);
3483
5e4009ba
JG		 3484err_out_class:
3485 class_unregister(&sd_disk_class);
3486err_out:
3487 for (i = 0; i < SD_MAJORS; i++)
3488 unregister_blkdev(sd_major(i), "sd");
3489 return err;
1da177e4
LT		 3490}
3491
3492/**
3493 * exit_sd - exit point for this driver (when it is a module).
3494 *
3495 * Note: this function unregisters this driver from the scsi mid-level.
3496 **/
3497static void __exit exit_sd(void)
3498{
3499 int i;
3500
3501 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3502
afd5e34b 3503 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3504 mempool_destroy(sd_cdb_pool);
3505 kmem_cache_destroy(sd_cdb_cache);
3506
5e4009ba
JG		 3507 class_unregister(&sd_disk_class);
3508
0761df9c
HR		 3509 for (i = 0; i < SD_MAJORS; i++) {
3510 blk_unregister_region(sd_major(i), SD_MINORS);
1da177e4 3511 unregister_blkdev(sd_major(i), "sd");
0761df9c 3512 }
1da177e4
LT		 3513}
3514
1da177e4
LT		 3515module_init(init_sd);
3516module_exit(exit_sd);
e73aec82
MP		 3517
3518static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3519 struct scsi_sense_hdr *sshdr)
3520{
21045519
HR		 3521 scsi_print_sense_hdr(sdkp->device,
3522 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
e73aec82
MP		 3523}
3524
ef61329d
HR		 3525static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3526 int result)
e73aec82 3527{
ef61329d
HR		 3528 const char *hb_string = scsi_hostbyte_string(result);
3529 const char *db_string = scsi_driverbyte_string(result);
3530
3531 if (hb_string || db_string)
3532 sd_printk(KERN_INFO, sdkp,
3533 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3534 hb_string ? hb_string : "invalid",
3535 db_string ? db_string : "invalid");
3536 else
3537 sd_printk(KERN_INFO, sdkp,
3538 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3539 msg, host_byte(result), driver_byte(result));
e73aec82
MP		 3540}
3541
Linux 6.x block layer and io_uring tree(s)