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scsi: merge __scsi_execute into scsi_execute
[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
7985090a 647 q->limits.discard_zeroes_data = 0;
39773722
MP		 648
649 /*
650 * When LBPRZ is reported, discard alignment and granularity
651 * must be fixed to the logical block size. Otherwise the block
652 * layer will drop misaligned portions of the request which can
653 * lead to data corruption. If LBPRZ is not set, we honor the
654 * device preference.
655 */
656 if (sdkp->lbprz) {
657 q->limits.discard_alignment = 0;
6540a65d 658 q->limits.discard_granularity = logical_block_size;
39773722
MP		 659 } else {
660 q->limits.discard_alignment = sdkp->unmap_alignment *
661 logical_block_size;
662 q->limits.discard_granularity =
663 max(sdkp->physical_block_size,
664 sdkp->unmap_granularity * logical_block_size);
665 }
c98a0eb0 666
89730393
MP		 667 sdkp->provisioning_mode = mode;
668
c98a0eb0
MP		 669 switch (mode) {
670
671 case SD_LBP_DISABLE:
2bb4cd5c 672 blk_queue_max_discard_sectors(q, 0);
c98a0eb0
MP		 673 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
674 return;
675
676 case SD_LBP_UNMAP:
5db44863
MP		 677 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
678 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 679 break;
680
681 case SD_LBP_WS16:
5db44863
MP		 682 max_blocks = min_not_zero(sdkp->max_ws_blocks,
683 (u32)SD_MAX_WS16_BLOCKS);
7985090a 684 q->limits.discard_zeroes_data = sdkp->lbprz;
c98a0eb0
MP		 685 break;
686
687 case SD_LBP_WS10:
5db44863
MP		 688 max_blocks = min_not_zero(sdkp->max_ws_blocks,
689 (u32)SD_MAX_WS10_BLOCKS);
7985090a 690 q->limits.discard_zeroes_data = sdkp->lbprz;
c98a0eb0
MP		 691 break;
692
693 case SD_LBP_ZERO:
5db44863
MP		 694 max_blocks = min_not_zero(sdkp->max_ws_blocks,
695 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 696 q->limits.discard_zeroes_data = 1;
697 break;
698 }
699
2bb4cd5c 700 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
c98a0eb0 701 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 702}
703
e339c1a7 704/**
26e85fcd 705 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
f2a3313d 706 * @sdp: scsi device to operate on
e339c1a7
MP		 707 * @rq: Request to prepare
708 *
709 * Will issue either UNMAP or WRITE SAME(16) depending on preference
710 * indicated by target device.
711 **/
6a7b4398 712static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
e339c1a7 713{
6a7b4398
CH		 714 struct request *rq = cmd->request;
715 struct scsi_device *sdp = cmd->device;
e339c1a7 716 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 717 sector_t sector = blk_rq_pos(rq);
718 unsigned int nr_sectors = blk_rq_sectors(rq);
66ac0280 719 unsigned int len;
f1126e95 720 int ret;
c98a0eb0 721 char *buf;
66ac0280 722 struct page *page;
e339c1a7 723
26e85fcd
MP		 724 sector >>= ilog2(sdp->sector_size) - 9;
725 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7 726
66ac0280
CH		 727 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
728 if (!page)
729 return BLKPREP_DEFER;
730
c98a0eb0
MP		 731 switch (sdkp->provisioning_mode) {
732 case SD_LBP_UNMAP:
733 buf = page_address(page);
e339c1a7 734
6a7b4398
CH		 735 cmd->cmd_len = 10;
736 cmd->cmnd[0] = UNMAP;
737 cmd->cmnd[8] = 24;
e339c1a7
MP		 738
739 put_unaligned_be16(6 + 16, &buf[0]);
740 put_unaligned_be16(16, &buf[2]);
741 put_unaligned_be64(sector, &buf[8]);
66ac0280 742 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 743
66ac0280 744 len = 24;
c98a0eb0
MP		 745 break;
746
747 case SD_LBP_WS16:
6a7b4398
CH		 748 cmd->cmd_len = 16;
749 cmd->cmnd[0] = WRITE_SAME_16;
750 cmd->cmnd[1] = 0x8; /* UNMAP */
751 put_unaligned_be64(sector, &cmd->cmnd[2]);
752 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
66ac0280
CH		 753
754 len = sdkp->device->sector_size;
c98a0eb0
MP		 755 break;
756
757 case SD_LBP_WS10:
758 case SD_LBP_ZERO:
6a7b4398
CH		 759 cmd->cmd_len = 10;
760 cmd->cmnd[0] = WRITE_SAME;
c98a0eb0 761 if (sdkp->provisioning_mode == SD_LBP_WS10)
6a7b4398
CH		 762 cmd->cmnd[1] = 0x8; /* UNMAP */
763 put_unaligned_be32(sector, &cmd->cmnd[2]);
764 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
c98a0eb0
MP		 765
766 len = sdkp->device->sector_size;
767 break;
768
769 default:
0fb5b1fb 770 ret = BLKPREP_INVALID;
c98a0eb0 771 goto out;
e339c1a7
MP		 772 }
773
6a7b4398
CH		 774 rq->timeout = SD_TIMEOUT;
775
776 cmd->transfersize = len;
e4200f8e 777 cmd->allowed = SD_MAX_RETRIES;
6a7b4398 778
f9d03f96
CH		 779 rq->special_vec.bv_page = page;
780 rq->special_vec.bv_offset = 0;
781 rq->special_vec.bv_len = len;
782
783 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
82ed4db4 784 scsi_req(rq)->resid_len = len;
c98a0eb0 785
f9d03f96 786 ret = scsi_init_io(cmd);
c98a0eb0 787out:
b4f42e28 788 if (ret != BLKPREP_OK)
610a6349 789 __free_page(page);
f1126e95
FT		 790 return ret;
791}
792
5db44863
MP		 793static void sd_config_write_same(struct scsi_disk *sdkp)
794{
795 struct request_queue *q = sdkp->disk->queue;
796 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 797
798 if (sdkp->device->no_write_same) {
799 sdkp->max_ws_blocks = 0;
800 goto out;
801 }
802
803 /* Some devices can not handle block counts above 0xffff despite
804 * supporting WRITE SAME(16). Consequently we default to 64k
805 * blocks per I/O unless the device explicitly advertises a
806 * bigger limit.
807 */
66c28f97
MP		 808 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
809 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
810 (u32)SD_MAX_WS16_BLOCKS);
811 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
812 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
813 (u32)SD_MAX_WS10_BLOCKS);
814 else {
815 sdkp->device->no_write_same = 1;
816 sdkp->max_ws_blocks = 0;
817 }
5db44863
MP		 818
819out:
66c28f97
MP		 820 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
821 (logical_block_size >> 9));
5db44863
MP		 822}
823
824/**
825 * sd_setup_write_same_cmnd - write the same data to multiple blocks
59b1134c 826 * @cmd: command to prepare
5db44863
MP		 827 *
828 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
829 * preference indicated by target device.
830 **/
59b1134c 831static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
5db44863 832{
59b1134c
CH		 833 struct request *rq = cmd->request;
834 struct scsi_device *sdp = cmd->device;
5db44863
MP		 835 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
836 struct bio *bio = rq->bio;
837 sector_t sector = blk_rq_pos(rq);
838 unsigned int nr_sectors = blk_rq_sectors(rq);
08965c2e 839 unsigned int nr_bytes = blk_rq_bytes(rq);
5db44863
MP		 840 int ret;
841
842 if (sdkp->device->no_write_same)
0fb5b1fb 843 return BLKPREP_INVALID;
5db44863 844
a4ad39b1 845 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
5db44863 846
89d94756
HR		 847 if (sd_is_zoned(sdkp)) {
848 ret = sd_zbc_setup_write_cmnd(cmd);
849 if (ret != BLKPREP_OK)
850 return ret;
851 }
852
5db44863
MP		 853 sector >>= ilog2(sdp->sector_size) - 9;
854 nr_sectors >>= ilog2(sdp->sector_size) - 9;
855
5db44863 856 rq->timeout = SD_WRITE_SAME_TIMEOUT;
5db44863
MP		 857
858 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
59b1134c
CH		 859 cmd->cmd_len = 16;
860 cmd->cmnd[0] = WRITE_SAME_16;
861 put_unaligned_be64(sector, &cmd->cmnd[2]);
862 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
5db44863 863 } else {
59b1134c
CH		 864 cmd->cmd_len = 10;
865 cmd->cmnd[0] = WRITE_SAME;
866 put_unaligned_be32(sector, &cmd->cmnd[2]);
867 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
5db44863
MP		 868 }
869
59b1134c 870 cmd->transfersize = sdp->sector_size;
a25ee548 871 cmd->allowed = SD_MAX_RETRIES;
08965c2e
BVA		 872
873 /*
874 * For WRITE SAME the data transferred via the DATA OUT buffer is
875 * different from the amount of data actually written to the target.
876 *
877 * We set up __data_len to the amount of data transferred via the
878 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
879 * to transfer a single sector of data first, but then reset it to
880 * the amount of data to be written right after so that the I/O path
881 * knows how much to actually write.
882 */
883 rq->__data_len = sdp->sector_size;
884 ret = scsi_init_io(cmd);
885 rq->__data_len = nr_bytes;
886 return ret;
5db44863
MP		 887}
888
a118c6c1 889static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
90467c29 890{
a118c6c1
CH		 891 struct request *rq = cmd->request;
892
893 /* flush requests don't perform I/O, zero the S/G table */
894 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
90467c29 895
a118c6c1
CH		 896 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
897 cmd->cmd_len = 10;
898 cmd->transfersize = 0;
899 cmd->allowed = SD_MAX_RETRIES;
900
26b9fd8b 901 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
a118c6c1 902 return BLKPREP_OK;
90467c29
FT		 903}
904
87949eee 905static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1da177e4 906{
a1b73fc1
CH		 907 struct request *rq = SCpnt->request;
908 struct scsi_device *sdp = SCpnt->device;
776b23a0 909 struct gendisk *disk = rq->rq_disk;
89d94756 910 struct scsi_disk *sdkp = scsi_disk(disk);
83096ebf 911 sector_t block = blk_rq_pos(rq);
18351070 912 sector_t threshold;
83096ebf 913 unsigned int this_count = blk_rq_sectors(rq);
c611529e 914 unsigned int dif, dix;
89d94756 915 bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
c611529e 916 int ret;
4e7392ec 917 unsigned char protect;
7f9a6bc4 918
89d94756
HR		 919 if (zoned_write) {
920 ret = sd_zbc_setup_write_cmnd(SCpnt);
921 if (ret != BLKPREP_OK)
922 return ret;
923 }
924
3c356bde 925 ret = scsi_init_io(SCpnt);
7f9a6bc4
JB		 926 if (ret != BLKPREP_OK)
927 goto out;
928 SCpnt = rq->special;
929
930 /* from here on until we're complete, any goto out
931 * is used for a killable error condition */
932 ret = BLKPREP_KILL;
1da177e4 933
a1b73fc1
CH		 934 SCSI_LOG_HLQUEUE(1,
935 scmd_printk(KERN_INFO, SCpnt,
936 "%s: block=%llu, count=%d\n",
937 __func__, (unsigned long long)block, this_count));
1da177e4
LT		 938
939 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 940 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 941 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 942 "Finishing %u sectors\n",
943 blk_rq_sectors(rq)));
fa0d34be
MP		 944 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
945 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 946 goto out;
1da177e4
LT		 947 }
948
949 if (sdp->changed) {
950 /*
951 * quietly refuse to do anything to a changed disc until
952 * the changed bit has been reset
953 */
3ff5588d 954 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 955 goto out;
1da177e4 956 }
7f9a6bc4 957
a0899d4d 958 /*
18351070
LT		 959 * Some SD card readers can't handle multi-sector accesses which touch
960 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 961 */
18351070
LT		 962 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
963 (sdp->sector_size / 512);
964
965 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
966 if (block < threshold) {
967 /* Access up to the threshold but not beyond */
968 this_count = threshold - block;
969 } else {
970 /* Access only a single hardware sector */
971 this_count = sdp->sector_size / 512;
972 }
973 }
a0899d4d 974
fa0d34be
MP		 975 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
976 (unsigned long long)block));
1da177e4
LT		 977
978 /*
979 * If we have a 1K hardware sectorsize, prevent access to single
980 * 512 byte sectors. In theory we could handle this - in fact
981 * the scsi cdrom driver must be able to handle this because
982 * we typically use 1K blocksizes, and cdroms typically have
983 * 2K hardware sectorsizes. Of course, things are simpler
984 * with the cdrom, since it is read-only. For performance
985 * reasons, the filesystems should be able to handle this
986 * and not force the scsi disk driver to use bounce buffers
987 * for this.
988 */
989 if (sdp->sector_size == 1024) {
83096ebf 990 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 991 scmd_printk(KERN_ERR, SCpnt,
992 "Bad block number requested\n");
7f9a6bc4 993 goto out;
1da177e4
LT		 994 } else {
995 block = block >> 1;
996 this_count = this_count >> 1;
997 }
998 }
999 if (sdp->sector_size == 2048) {
83096ebf 1000 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 1001 scmd_printk(KERN_ERR, SCpnt,
1002 "Bad block number requested\n");
7f9a6bc4 1003 goto out;
1da177e4
LT		 1004 } else {
1005 block = block >> 2;
1006 this_count = this_count >> 2;
1007 }
1008 }
1009 if (sdp->sector_size == 4096) {
83096ebf 1010 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 1011 scmd_printk(KERN_ERR, SCpnt,
1012 "Bad block number requested\n");
7f9a6bc4 1013 goto out;
1da177e4
LT		 1014 } else {
1015 block = block >> 3;
1016 this_count = this_count >> 3;
1017 }
1018 }
1019 if (rq_data_dir(rq) == WRITE) {
1da177e4 1020 SCpnt->cmnd[0] = WRITE_6;
af55ff67 1021
8c579ab6 1022 if (blk_integrity_rq(rq))
c611529e 1023 sd_dif_prepare(SCpnt);
af55ff67 1024
1da177e4
LT		 1025 } else if (rq_data_dir(rq) == READ) {
1026 SCpnt->cmnd[0] = READ_6;
1da177e4 1027 } else {
ef295ecf 1028 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
7f9a6bc4 1029 goto out;
1da177e4
LT		 1030 }
1031
fa0d34be 1032 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 1033 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1034 (rq_data_dir(rq) == WRITE) ?
1035 "writing" : "reading", this_count,
83096ebf 1036 blk_rq_sectors(rq)));
1da177e4 1037
c611529e
MP		 1038 dix = scsi_prot_sg_count(SCpnt);
1039 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1040
1041 if (dif || dix)
1042 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
af55ff67 1043 else
4e7392ec
MP		 1044 protect = 0;
1045
8475c811 1046 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
4e7392ec
MP		 1047 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1048
1049 if (unlikely(SCpnt->cmnd == NULL)) {
1050 ret = BLKPREP_DEFER;
1051 goto out;
1052 }
af55ff67 1053
4e7392ec
MP		 1054 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1055 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1056 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1057 SCpnt->cmnd[7] = 0x18;
1058 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1059 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1060
1061 /* LBA */
1062 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1063 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1064 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1065 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1066 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1067 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1068 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1069 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1070
1071 /* Expected Indirect LBA */
1072 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1073 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1074 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1075 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1076
1077 /* Transfer length */
1078 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1079 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1080 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1081 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
e430cbc8 1082 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1da177e4 1083 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1084 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1085 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1086 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1087 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1088 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1089 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1090 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1091 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1092 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1093 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1094 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1095 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1096 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1097 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1098 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1099 scsi_device_protection(SCpnt->device) ||
1da177e4 1100 SCpnt->device->use_10_for_rw) {
1da177e4 1101 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1102 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1103 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1104 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1105 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1106 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1107 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1108 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1109 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1110 } else {
33659ebb 1111 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1112 /*
1113 * This happens only if this drive failed
1114 * 10byte rw command with ILLEGAL_REQUEST
1115 * during operation and thus turned off
1116 * use_10_for_rw.
1117 */
e73aec82
MP		 1118 scmd_printk(KERN_ERR, SCpnt,
1119 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1120 goto out;
007365ad
TH		 1121 }
1122
1da177e4
LT		 1123 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1124 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1125 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1126 SCpnt->cmnd[4] = (unsigned char) this_count;
1127 SCpnt->cmnd[5] = 0;
1128 }
30b0c37b 1129 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4
LT		 1130
1131 /*
1132 * We shouldn't disconnect in the middle of a sector, so with a dumb
1133 * host adapter, it's safe to assume that we can at least transfer
1134 * this many bytes between each connect / disconnect.
1135 */
1136 SCpnt->transfersize = sdp->sector_size;
1137 SCpnt->underflow = this_count << 9;
1138 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1139
1da177e4
LT		 1140 /*
1141 * This indicates that the command is ready from our end to be
1142 * queued.
1143 */
7f9a6bc4
JB		 1144 ret = BLKPREP_OK;
1145 out:
89d94756
HR		 1146 if (zoned_write && ret != BLKPREP_OK)
1147 sd_zbc_cancel_write_cmnd(SCpnt);
1148
a1b73fc1 1149 return ret;
1da177e4
LT		 1150}
1151
87949eee
CH		 1152static int sd_init_command(struct scsi_cmnd *cmd)
1153{
1154 struct request *rq = cmd->request;
1155
c2df40df
MC		 1156 switch (req_op(rq)) {
1157 case REQ_OP_DISCARD:
87949eee 1158 return sd_setup_discard_cmnd(cmd);
c2df40df 1159 case REQ_OP_WRITE_SAME:
87949eee 1160 return sd_setup_write_same_cmnd(cmd);
3a5e02ce 1161 case REQ_OP_FLUSH:
87949eee 1162 return sd_setup_flush_cmnd(cmd);
c2df40df
MC		 1163 case REQ_OP_READ:
1164 case REQ_OP_WRITE:
87949eee 1165 return sd_setup_read_write_cmnd(cmd);
89d94756
HR		 1166 case REQ_OP_ZONE_REPORT:
1167 return sd_zbc_setup_report_cmnd(cmd);
1168 case REQ_OP_ZONE_RESET:
1169 return sd_zbc_setup_reset_cmnd(cmd);
c2df40df
MC		 1170 default:
1171 BUG();
1172 }
87949eee
CH		 1173}
1174
1175static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1176{
1177 struct request *rq = SCpnt->request;
1178
f9d03f96
CH		 1179 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1180 __free_page(rq->special_vec.bv_page);
87949eee 1181
82ed4db4 1182 if (SCpnt->cmnd != scsi_req(rq)->cmd) {
87949eee
CH		 1183 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1184 SCpnt->cmnd = NULL;
1185 SCpnt->cmd_len = 0;
1186 }
1187}
1188
1da177e4
LT		 1189/**
1190 * sd_open - open a scsi disk device
1191 * @inode: only i_rdev member may be used
1192 * @filp: only f_mode and f_flags may be used
1193 *
1194 * Returns 0 if successful. Returns a negated errno value in case
1195 * of error.
1196 *
1197 * Note: This can be called from a user context (e.g. fsck(1) )
1198 * or from within the kernel (e.g. as a result of a mount(1) ).
1199 * In the latter case @inode and @filp carry an abridged amount
1200 * of information as noted above.
409f3499
AB		 1201 *
1202 * Locking: called with bdev->bd_mutex held.
1da177e4 1203 **/
0338e291 1204static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1205{
0338e291 1206 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1207 struct scsi_device *sdev;
1208 int retval;
1209
0338e291 1210 if (!sdkp)
1da177e4
LT		 1211 return -ENXIO;
1212
fa0d34be 1213 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1214
1215 sdev = sdkp->device;
1216
1217 /*
1218 * If the device is in error recovery, wait until it is done.
1219 * If the device is offline, then disallow any access to it.
1220 */
1221 retval = -ENXIO;
1222 if (!scsi_block_when_processing_errors(sdev))
1223 goto error_out;
1224
1225 if (sdev->removable || sdkp->write_prot)
0338e291 1226 check_disk_change(bdev);
1da177e4
LT		 1227
1228 /*
1229 * If the drive is empty, just let the open fail.
1230 */
1231 retval = -ENOMEDIUM;
0338e291 1232 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1233 goto error_out;
1234
1235 /*
1236 * If the device has the write protect tab set, have the open fail
1237 * if the user expects to be able to write to the thing.
1238 */
1239 retval = -EROFS;
0338e291 1240 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1241 goto error_out;
1242
1243 /*
1244 * It is possible that the disk changing stuff resulted in
1245 * the device being taken offline. If this is the case,
1246 * report this to the user, and don't pretend that the
1247 * open actually succeeded.
1248 */
1249 retval = -ENXIO;
1250 if (!scsi_device_online(sdev))
1251 goto error_out;
1252
409f3499 1253 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1254 if (scsi_block_when_processing_errors(sdev))
1255 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1256 }
1257
1258 return 0;
1259
1260error_out:
1261 scsi_disk_put(sdkp);
1262 return retval;
1263}
1264
1265/**
1266 * sd_release - invoked when the (last) close(2) is called on this
1267 * scsi disk.
1268 * @inode: only i_rdev member may be used
1269 * @filp: only f_mode and f_flags may be used
1270 *
1271 * Returns 0.
1272 *
1273 * Note: may block (uninterruptible) if error recovery is underway
1274 * on this disk.
409f3499
AB		 1275 *
1276 * Locking: called with bdev->bd_mutex held.
1da177e4 1277 **/
db2a144b 1278static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1279{
1da177e4
LT		 1280 struct scsi_disk *sdkp = scsi_disk(disk);
1281 struct scsi_device *sdev = sdkp->device;
1282
56937f7b 1283 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1284
7e443312 1285 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1286 if (scsi_block_when_processing_errors(sdev))
1287 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1288 }
1289
1290 /*
1291 * XXX and what if there are packets in flight and this close()
1292 * XXX is followed by a "rmmod sd_mod"?
1293 */
478a8a05 1294
1da177e4 1295 scsi_disk_put(sdkp);
1da177e4
LT		 1296}
1297
a885c8c4 1298static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1299{
1300 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1301 struct scsi_device *sdp = sdkp->device;
1302 struct Scsi_Host *host = sdp->host;
f08bb1e0 1303 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1da177e4
LT		 1304 int diskinfo[4];
1305
1306 /* default to most commonly used values */
f08bb1e0
MP		 1307 diskinfo[0] = 0x40; /* 1 << 6 */
1308 diskinfo[1] = 0x20; /* 1 << 5 */
1309 diskinfo[2] = capacity >> 11;
1310
1da177e4
LT		 1311 /* override with calculated, extended default, or driver values */
1312 if (host->hostt->bios_param)
f08bb1e0 1313 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1da177e4 1314 else
f08bb1e0 1315 scsicam_bios_param(bdev, capacity, diskinfo);
1da177e4 1316
a885c8c4
CH		 1317 geo->heads = diskinfo[0];
1318 geo->sectors = diskinfo[1];
1319 geo->cylinders = diskinfo[2];
1da177e4
LT		 1320 return 0;
1321}
1322
1323/**
1324 * sd_ioctl - process an ioctl
1325 * @inode: only i_rdev/i_bdev members may be used
1326 * @filp: only f_mode and f_flags may be used
1327 * @cmd: ioctl command number
1328 * @arg: this is third argument given to ioctl(2) system call.
1329 * Often contains a pointer.
1330 *
25985edc 1331 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1332 * success as well). Returns a negated errno value in case of error.
1333 *
1334 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1335 * down in the scsi subsystem.
1da177e4 1336 **/
0338e291 1337static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1338 unsigned int cmd, unsigned long arg)
1339{
1da177e4 1340 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1341 struct scsi_disk *sdkp = scsi_disk(disk);
1342 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1343 void __user *p = (void __user *)arg;
1344 int error;
1345
fe2d1851
NN		 1346 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1347 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1348
0bfc96cb
PB		 1349 error = scsi_verify_blk_ioctl(bdev, cmd);
1350 if (error < 0)
1351 return error;
1352
1da177e4
LT		 1353 /*
1354 * If we are in the middle of error recovery, don't let anyone
1355 * else try and use this device. Also, if error recovery fails, it
1356 * may try and take the device offline, in which case all further
1357 * access to the device is prohibited.
1358 */
906d15fb
CH		 1359 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1360 (mode & FMODE_NDELAY) != 0);
1361 if (error)
8a6cfeb6 1362 goto out;
1da177e4 1363
1da177e4
LT		 1364 /*
1365 * Send SCSI addressing ioctls directly to mid level, send other
1366 * ioctls to block level and then onto mid level if they can't be
1367 * resolved.
1368 */
1369 switch (cmd) {
1370 case SCSI_IOCTL_GET_IDLUN:
1371 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1372 error = scsi_ioctl(sdp, cmd, p);
1373 break;
1da177e4 1374 default:
577ebb37 1375 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1376 if (error != -ENOTTY)
8a6cfeb6
AB		 1377 break;
1378 error = scsi_ioctl(sdp, cmd, p);
1379 break;
1da177e4 1380 }
8a6cfeb6 1381out:
8a6cfeb6 1382 return error;
1da177e4
LT		 1383}
1384
1385static void set_media_not_present(struct scsi_disk *sdkp)
1386{
2bae0093
TH		 1387 if (sdkp->media_present)
1388 sdkp->device->changed = 1;
1389
1390 if (sdkp->device->removable) {
1391 sdkp->media_present = 0;
1392 sdkp->capacity = 0;
1393 }
1394}
1395
1396static int media_not_present(struct scsi_disk *sdkp,
1397 struct scsi_sense_hdr *sshdr)
1398{
1399 if (!scsi_sense_valid(sshdr))
1400 return 0;
1401
1402 /* not invoked for commands that could return deferred errors */
1403 switch (sshdr->sense_key) {
1404 case UNIT_ATTENTION:
1405 case NOT_READY:
1406 /* medium not present */
1407 if (sshdr->asc == 0x3A) {
1408 set_media_not_present(sdkp);
1409 return 1;
1410 }
1411 }
1412 return 0;
1da177e4
LT		 1413}
1414
1415/**
2bae0093
TH		 1416 * sd_check_events - check media events
1417 * @disk: kernel device descriptor
1418 * @clearing: disk events currently being cleared
1da177e4 1419 *
2bae0093 1420 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1421 *
1422 * Note: this function is invoked from the block subsystem.
1423 **/
2bae0093 1424static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4 1425{
eb72d0bb
HR		 1426 struct scsi_disk *sdkp = scsi_disk_get(disk);
1427 struct scsi_device *sdp;
1da177e4
LT		 1428 int retval;
1429
eb72d0bb
HR		 1430 if (!sdkp)
1431 return 0;
1432
1433 sdp = sdkp->device;
2bae0093 1434 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1435
1436 /*
1437 * If the device is offline, don't send any commands - just pretend as
1438 * if the command failed. If the device ever comes back online, we
1439 * can deal with it then. It is only because of unrecoverable errors
1440 * that we would ever take a device offline in the first place.
1441 */
285e9670
KS		 1442 if (!scsi_device_online(sdp)) {
1443 set_media_not_present(sdkp);
285e9670
KS		 1444 goto out;
1445 }
1da177e4
LT		 1446
1447 /*
1448 * Using TEST_UNIT_READY enables differentiation between drive with
1449 * no cartridge loaded - NOT READY, drive with changed cartridge -
1450 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1451 *
1452 * Drives that auto spin down. eg iomega jaz 1G, will be started
1453 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1454 * sd_revalidate() is called.
1455 */
001aac25 1456 if (scsi_block_when_processing_errors(sdp)) {
6fa2b8f9
CH		 1457 struct scsi_sense_hdr sshdr = { 0, };
1458
001aac25 1459 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
6fa2b8f9 1460 &sshdr);
1da177e4 1461
6fa2b8f9
CH		 1462 /* failed to execute TUR, assume media not present */
1463 if (host_byte(retval)) {
1464 set_media_not_present(sdkp);
1465 goto out;
1466 }
1da177e4 1467
6fa2b8f9
CH		 1468 if (media_not_present(sdkp, &sshdr))
1469 goto out;
1470 }
2bae0093 1471
1da177e4
LT		 1472 /*
1473 * For removable scsi disk we have to recognise the presence
2bae0093 1474 * of a disk in the drive.
1da177e4 1475 */
2bae0093
TH		 1476 if (!sdkp->media_present)
1477 sdp->changed = 1;
1da177e4 1478 sdkp->media_present = 1;
285e9670 1479out:
3ff5588d 1480 /*
2bae0093 1481 * sdp->changed is set under the following conditions:
3ff5588d 1482 *
2bae0093
TH		 1483 * Medium present state has changed in either direction.
1484 * Device has indicated UNIT_ATTENTION.
3ff5588d 1485 */
2bae0093
TH		 1486 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1487 sdp->changed = 0;
eb72d0bb 1488 scsi_disk_put(sdkp);
1da177e4 1489 return retval;
1da177e4
LT		 1490}
1491
e73aec82 1492static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1493{
1da177e4 1494 int retries, res;
e73aec82 1495 struct scsi_device *sdp = sdkp->device;
7e660100
JB		 1496 const int timeout = sdp->request_queue->rq_timeout
1497 * SD_FLUSH_TIMEOUT_MULTIPLIER;
ea73a9f2 1498 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1499
1500 if (!scsi_device_online(sdp))
1501 return -ENODEV;
1502
1da177e4
LT		 1503 for (retries = 3; retries > 0; --retries) {
1504 unsigned char cmd[10] = { 0 };
1505
1506 cmd[0] = SYNCHRONIZE_CACHE;
1507 /*
1508 * Leave the rest of the command zero to indicate
1509 * flush everything.
1510 */
9b21493c 1511 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
7e660100 1512 &sshdr, timeout, SD_MAX_RETRIES,
e8064021 1513 NULL, 0, RQF_PM);
ea73a9f2 1514 if (res == 0)
1da177e4
LT		 1515 break;
1516 }
1517
e73aec82 1518 if (res) {
ef61329d 1519 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
95897910 1520
e73aec82
MP		 1521 if (driver_byte(res) & DRIVER_SENSE)
1522 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 1523 /* we need to evaluate the error return */
1524 if (scsi_sense_valid(&sshdr) &&
7aae5134
AS		 1525 (sshdr.asc == 0x3a || /* medium not present */
1526 sshdr.asc == 0x20)) /* invalid command */
95897910
ON		 1527 /* this is no error here */
1528 return 0;
1529
1530 switch (host_byte(res)) {
1531 /* ignore errors due to racing a disconnection */
1532 case DID_BAD_TARGET:
1533 case DID_NO_CONNECT:
1534 return 0;
1535 /* signal the upper layer it might try again */
1536 case DID_BUS_BUSY:
1537 case DID_IMM_RETRY:
1538 case DID_REQUEUE:
1539 case DID_SOFT_ERROR:
1540 return -EBUSY;
1541 default:
1542 return -EIO;
1543 }
1da177e4 1544 }
3721050a 1545 return 0;
1da177e4
LT		 1546}
1547
1da177e4
LT		 1548static void sd_rescan(struct device *dev)
1549{
3d9a1f53 1550 struct scsi_disk *sdkp = dev_get_drvdata(dev);
39b7f1e2 1551
3d9a1f53 1552 revalidate_disk(sdkp->disk);
1da177e4
LT		 1553}
1554
1555
1556#ifdef CONFIG_COMPAT
1557/*
1558 * This gets directly called from VFS. When the ioctl
1559 * is not recognized we go back to the other translation paths.
1560 */
0338e291
AV		 1561static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1562 unsigned int cmd, unsigned long arg)
1da177e4 1563{
0338e291 1564 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
21a9d4c9 1565 int error;
1da177e4 1566
21a9d4c9
CH		 1567 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1568 (mode & FMODE_NDELAY) != 0);
1569 if (error)
1570 return error;
1da177e4 1571
1da177e4
LT		 1572 /*
1573 * Let the static ioctl translation table take care of it.
1574 */
21a9d4c9
CH		 1575 if (!sdev->host->hostt->compat_ioctl)
1576 return -ENOIOCTLCMD;
1577 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1da177e4
LT		 1578}
1579#endif
1580
924d55b0
CH		 1581static char sd_pr_type(enum pr_type type)
1582{
1583 switch (type) {
1584 case PR_WRITE_EXCLUSIVE:
1585 return 0x01;
1586 case PR_EXCLUSIVE_ACCESS:
1587 return 0x03;
1588 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1589 return 0x05;
1590 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1591 return 0x06;
1592 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1593 return 0x07;
1594 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1595 return 0x08;
1596 default:
1597 return 0;
1598 }
1599};
1600
1601static int sd_pr_command(struct block_device *bdev, u8 sa,
1602 u64 key, u64 sa_key, u8 type, u8 flags)
1603{
1604 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1605 struct scsi_sense_hdr sshdr;
1606 int result;
1607 u8 cmd[16] = { 0, };
1608 u8 data[24] = { 0, };
1609
1610 cmd[0] = PERSISTENT_RESERVE_OUT;
1611 cmd[1] = sa;
1612 cmd[2] = type;
1613 put_unaligned_be32(sizeof(data), &cmd[5]);
1614
1615 put_unaligned_be64(key, &data[0]);
1616 put_unaligned_be64(sa_key, &data[8]);
1617 data[20] = flags;
1618
1619 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1620 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1621
1622 if ((driver_byte(result) & DRIVER_SENSE) &&
1623 (scsi_sense_valid(&sshdr))) {
1624 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1625 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1626 }
1627
1628 return result;
1629}
1630
1631static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1632 u32 flags)
1633{
1634 if (flags & ~PR_FL_IGNORE_KEY)
1635 return -EOPNOTSUPP;
1636 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1637 old_key, new_key, 0,
01f90dd9 1638 (1 << 0) /* APTPL */);
924d55b0
CH		 1639}
1640
1641static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1642 u32 flags)
1643{
1644 if (flags)
1645 return -EOPNOTSUPP;
1646 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1647}
1648
1649static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1650{
1651 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1652}
1653
1654static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1655 enum pr_type type, bool abort)
1656{
1657 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1658 sd_pr_type(type), 0);
1659}
1660
1661static int sd_pr_clear(struct block_device *bdev, u64 key)
1662{
1663 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1664}
1665
1666static const struct pr_ops sd_pr_ops = {
1667 .pr_register = sd_pr_register,
1668 .pr_reserve = sd_pr_reserve,
1669 .pr_release = sd_pr_release,
1670 .pr_preempt = sd_pr_preempt,
1671 .pr_clear = sd_pr_clear,
1672};
1673
83d5cde4 1674static const struct block_device_operations sd_fops = {
1da177e4 1675 .owner = THIS_MODULE,
0338e291
AV		 1676 .open = sd_open,
1677 .release = sd_release,
8a6cfeb6 1678 .ioctl = sd_ioctl,
a885c8c4 1679 .getgeo = sd_getgeo,
1da177e4 1680#ifdef CONFIG_COMPAT
0338e291 1681 .compat_ioctl = sd_compat_ioctl,
1da177e4 1682#endif
2bae0093 1683 .check_events = sd_check_events,
1da177e4 1684 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1685 .unlock_native_capacity = sd_unlock_native_capacity,
924d55b0 1686 .pr_ops = &sd_pr_ops,
1da177e4
LT		 1687};
1688
18a4d0a2
MP		 1689/**
1690 * sd_eh_action - error handling callback
1691 * @scmd: sd-issued command that has failed
18a4d0a2
MP		 1692 * @eh_disp: The recovery disposition suggested by the midlayer
1693 *
2451079b
JB		 1694 * This function is called by the SCSI midlayer upon completion of an
1695 * error test command (currently TEST UNIT READY). The result of sending
1696 * the eh command is passed in eh_disp. We're looking for devices that
1697 * fail medium access commands but are OK with non access commands like
1698 * test unit ready (so wrongly see the device as having a successful
1699 * recovery)
18a4d0a2 1700 **/
2451079b 1701static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
18a4d0a2
MP		 1702{
1703 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1704
1705 if (!scsi_device_online(scmd->device) ||
2451079b
JB		 1706 !scsi_medium_access_command(scmd) ||
1707 host_byte(scmd->result) != DID_TIME_OUT ||
1708 eh_disp != SUCCESS)
18a4d0a2
MP		 1709 return eh_disp;
1710
1711 /*
1712 * The device has timed out executing a medium access command.
1713 * However, the TEST UNIT READY command sent during error
1714 * handling completed successfully. Either the device is in the
1715 * process of recovering or has it suffered an internal failure
1716 * that prevents access to the storage medium.
1717 */
2451079b 1718 sdkp->medium_access_timed_out++;
18a4d0a2
MP		 1719
1720 /*
1721 * If the device keeps failing read/write commands but TEST UNIT
1722 * READY always completes successfully we assume that medium
1723 * access is no longer possible and take the device offline.
1724 */
1725 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1726 scmd_printk(KERN_ERR, scmd,
1727 "Medium access timeout failure. Offlining disk!\n");
1728 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1729
1730 return FAILED;
1731 }
1732
1733 return eh_disp;
1734}
1735
af55ff67
MP		 1736static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1737{
83096ebf
TH		 1738 u64 start_lba = blk_rq_pos(scmd->request);
1739 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
74856fbf 1740 u64 factor = scmd->device->sector_size / 512;
af55ff67
MP		 1741 u64 bad_lba;
1742 int info_valid;
a8733c7b
JB		 1743 /*
1744 * resid is optional but mostly filled in. When it's unused,
1745 * its value is zero, so we assume the whole buffer transferred
1746 */
1747 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1748 unsigned int good_bytes;
af55ff67 1749
af55ff67
MP		 1750 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1751 SCSI_SENSE_BUFFERSIZE,
1752 &bad_lba);
1753 if (!info_valid)
1754 return 0;
1755
1756 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1757 return 0;
1758
74856fbf
MH		 1759 /* be careful ... don't want any overflows */
1760 do_div(start_lba, factor);
1761 do_div(end_lba, factor);
af55ff67
MP		 1762
1763 /* The bad lba was reported incorrectly, we have no idea where
1764 * the error is.
1765 */
1766 if (bad_lba < start_lba || bad_lba >= end_lba)
1767 return 0;
1768
1769 /* This computation should always be done in terms of
1770 * the resolution of the device's medium.
1771 */
a8733c7b
JB		 1772 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1773 return min(good_bytes, transferred);
af55ff67
MP		 1774}
1775
1da177e4 1776/**
7b3d9545 1777 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1778 * driver has completed (successfully or otherwise) a scsi command.
1779 * @SCpnt: mid-level's per command structure.
1780 *
1781 * Note: potentially run from within an ISR. Must not block.
1782 **/
7b3d9545 1783static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1784{
1785 int result = SCpnt->result;
af55ff67 1786 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1787 struct scsi_sense_hdr sshdr;
4e7392ec 1788 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1789 struct request *req = SCpnt->request;
1da177e4
LT		 1790 int sense_valid = 0;
1791 int sense_deferred = 0;
c98a0eb0 1792 unsigned char op = SCpnt->cmnd[0];
5db44863 1793 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1794
89d94756
HR		 1795 switch (req_op(req)) {
1796 case REQ_OP_DISCARD:
1797 case REQ_OP_WRITE_SAME:
1798 case REQ_OP_ZONE_RESET:
26e85fcd
MP		 1799 if (!result) {
1800 good_bytes = blk_rq_bytes(req);
1801 scsi_set_resid(SCpnt, 0);
1802 } else {
1803 good_bytes = 0;
1804 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1805 }
89d94756
HR		 1806 break;
1807 case REQ_OP_ZONE_REPORT:
1808 if (!result) {
1809 good_bytes = scsi_bufflen(SCpnt)
1810 - scsi_get_resid(SCpnt);
1811 scsi_set_resid(SCpnt, 0);
1812 } else {
1813 good_bytes = 0;
1814 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1815 }
1816 break;
26e85fcd 1817 }
6a32a8ae 1818
1da177e4
LT		 1819 if (result) {
1820 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1821 if (sense_valid)
1822 sense_deferred = scsi_sense_is_deferred(&sshdr);
1823 }
2a863ba8
DJ		 1824 sdkp->medium_access_timed_out = 0;
1825
03aba2f7
LT		 1826 if (driver_byte(result) != DRIVER_SENSE &&
1827 (!sense_valid || sense_deferred))
1828 goto out;
1829
1830 switch (sshdr.sense_key) {
1831 case HARDWARE_ERROR:
1832 case MEDIUM_ERROR:
af55ff67 1833 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1834 break;
1835 case RECOVERED_ERROR:
af55ff67
MP		 1836 good_bytes = scsi_bufflen(SCpnt);
1837 break;
10dab226
JW		 1838 case NO_SENSE:
1839 /* This indicates a false check condition, so ignore it. An
1840 * unknown amount of data was transferred so treat it as an
1841 * error.
1842 */
10dab226
JW		 1843 SCpnt->result = 0;
1844 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1845 break;
c98a0eb0
MP		 1846 case ABORTED_COMMAND:
1847 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1848 good_bytes = sd_completed_bytes(SCpnt);
1849 break;
1850 case ILLEGAL_REQUEST:
1851 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1852 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1853 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1854 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1855 switch (op) {
1856 case UNMAP:
1857 sd_config_discard(sdkp, SD_LBP_DISABLE);
1858 break;
1859 case WRITE_SAME_16:
1860 case WRITE_SAME:
1861 if (unmap)
1862 sd_config_discard(sdkp, SD_LBP_DISABLE);
1863 else {
1864 sdkp->device->no_write_same = 1;
1865 sd_config_write_same(sdkp);
1866
1867 good_bytes = 0;
1868 req->__data_len = blk_rq_bytes(req);
e8064021 1869 req->rq_flags |= RQF_QUIET;
5db44863
MP		 1870 }
1871 }
1872 }
03aba2f7
LT		 1873 break;
1874 default:
1875 break;
1da177e4 1876 }
89d94756 1877
03aba2f7 1878 out:
89d94756
HR		 1879 if (sd_is_zoned(sdkp))
1880 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
1881
ef61329d
HR		 1882 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1883 "sd_done: completed %d of %d bytes\n",
1884 good_bytes, scsi_bufflen(SCpnt)));
1885
af55ff67
MP		 1886 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1887 sd_dif_complete(SCpnt, good_bytes);
1888
7b3d9545 1889 return good_bytes;
1da177e4
LT		 1890}
1891
1da177e4
LT		 1892/*
1893 * spinup disk - called only in sd_revalidate_disk()
1894 */
1895static void
e73aec82 1896sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1897{
1da177e4 1898 unsigned char cmd[10];
4451e472 1899 unsigned long spintime_expire = 0;
1da177e4
LT		 1900 int retries, spintime;
1901 unsigned int the_result;
1902 struct scsi_sense_hdr sshdr;
1903 int sense_valid = 0;
1904
1905 spintime = 0;
1906
1907 /* Spin up drives, as required. Only do this at boot time */
1908 /* Spinup needs to be done for module loads too. */
1909 do {
1910 retries = 0;
1911
1912 do {
1913 cmd[0] = TEST_UNIT_READY;
1914 memset((void *) &cmd[1], 0, 9);
1915
ea73a9f2
JB		 1916 the_result = scsi_execute_req(sdkp->device, cmd,
1917 DMA_NONE, NULL, 0,
1918 &sshdr, SD_TIMEOUT,
f4f4e47e 1919 SD_MAX_RETRIES, NULL);
1da177e4 1920
b4d38e38
AS		 1921 /*
1922 * If the drive has indicated to us that it
1923 * doesn't have any media in it, don't bother
1924 * with any more polling.
1925 */
1926 if (media_not_present(sdkp, &sshdr))
1927 return;
1928
1da177e4 1929 if (the_result)
ea73a9f2 1930 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1931 retries++;
1932 } while (retries < 3 &&
1933 (!scsi_status_is_good(the_result) ||
1934 ((driver_byte(the_result) & DRIVER_SENSE) &&
1935 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1936
1da177e4
LT		 1937 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1938 /* no sense, TUR either succeeded or failed
1939 * with a status error */
e73aec82 1940 if(!spintime && !scsi_status_is_good(the_result)) {
ef61329d
HR		 1941 sd_print_result(sdkp, "Test Unit Ready failed",
1942 the_result);
e73aec82 1943 }
1da177e4
LT		 1944 break;
1945 }
ef61329d 1946
1da177e4
LT		 1947 /*
1948 * The device does not want the automatic start to be issued.
1949 */
33dd6f92 1950 if (sdkp->device->no_start_on_add)
1da177e4 1951 break;
1da177e4 1952
33dd6f92
MW		 1953 if (sense_valid && sshdr.sense_key == NOT_READY) {
1954 if (sshdr.asc == 4 && sshdr.ascq == 3)
1955 break; /* manual intervention required */
1956 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1957 break; /* standby */
1958 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1959 break; /* unavailable */
1960 /*
1961 * Issue command to spin up drive when not ready
1962 */
1da177e4 1963 if (!spintime) {
e73aec82 1964 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1965 cmd[0] = START_STOP;
1966 cmd[1] = 1; /* Return immediately */
1967 memset((void *) &cmd[2], 0, 8);
1968 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1969 if (sdkp->device->start_stop_pwr_cond)
1970 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1971 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1972 NULL, 0, &sshdr,
f4f4e47e
FT		 1973 SD_TIMEOUT, SD_MAX_RETRIES,
1974 NULL);
4451e472
AS		 1975 spintime_expire = jiffies + 100 * HZ;
1976 spintime = 1;
1da177e4 1977 }
1da177e4
LT		 1978 /* Wait 1 second for next try */
1979 msleep(1000);
1980 printk(".");
4451e472
AS		 1981
1982 /*
1983 * Wait for USB flash devices with slow firmware.
1984 * Yes, this sense key/ASC combination shouldn't
1985 * occur here. It's characteristic of these devices.
1986 */
1987 } else if (sense_valid &&
1988 sshdr.sense_key == UNIT_ATTENTION &&
1989 sshdr.asc == 0x28) {
1990 if (!spintime) {
1991 spintime_expire = jiffies + 5 * HZ;
1992 spintime = 1;
1993 }
1994 /* Wait 1 second for next try */
1995 msleep(1000);
1da177e4
LT		 1996 } else {
1997 /* we don't understand the sense code, so it's
1998 * probably pointless to loop */
1999 if(!spintime) {
e73aec82
MP		 2000 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2001 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 2002 }
2003 break;
2004 }
2005
4451e472 2006 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 2007
2008 if (spintime) {
2009 if (scsi_status_is_good(the_result))
2010 printk("ready\n");
2011 else
2012 printk("not responding...\n");
2013 }
2014}
2015
e0597d70
MP		 2016/*
2017 * Determine whether disk supports Data Integrity Field.
2018 */
fe542396 2019static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2020{
2021 struct scsi_device *sdp = sdkp->device;
2022 u8 type;
fe542396 2023 int ret = 0;
e0597d70
MP		 2024
2025 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 2026 return ret;
35e1a5d9
MP		 2027
2028 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2029
8475c811 2030 if (type > T10_PI_TYPE3_PROTECTION)
fe542396
MP		 2031 ret = -ENODEV;
2032 else if (scsi_host_dif_capable(sdp->host, type))
2033 ret = 1;
2034
2035 if (sdkp->first_scan || type != sdkp->protection_type)
2036 switch (ret) {
2037 case -ENODEV:
2038 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2039 " protection type %u. Disabling disk!\n",
2040 type);
2041 break;
2042 case 1:
2043 sd_printk(KERN_NOTICE, sdkp,
2044 "Enabling DIF Type %u protection\n", type);
2045 break;
2046 case 0:
2047 sd_printk(KERN_NOTICE, sdkp,
2048 "Disabling DIF Type %u protection\n", type);
2049 break;
2050 }
e0597d70 2051
be922f47
MP		 2052 sdkp->protection_type = type;
2053
fe542396 2054 return ret;
e0597d70
MP		 2055}
2056
0da205e0
MW		 2057static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2058 struct scsi_sense_hdr *sshdr, int sense_valid,
2059 int the_result)
2060{
0da205e0
MW		 2061 if (driver_byte(the_result) & DRIVER_SENSE)
2062 sd_print_sense_hdr(sdkp, sshdr);
2063 else
2064 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2065
2066 /*
2067 * Set dirty bit for removable devices if not ready -
2068 * sometimes drives will not report this properly.
2069 */
2070 if (sdp->removable &&
2071 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 2072 set_media_not_present(sdkp);
0da205e0
MW		 2073
2074 /*
2075 * We used to set media_present to 0 here to indicate no media
2076 * in the drive, but some drives fail read capacity even with
2077 * media present, so we can't do that.
2078 */
2079 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2080}
2081
2082#define RC16_LEN 32
2083#if RC16_LEN > SD_BUF_SIZE
2084#error RC16_LEN must not be more than SD_BUF_SIZE
2085#endif
2086
3233ac19
JB		 2087#define READ_CAPACITY_RETRIES_ON_RESET 10
2088
0da205e0
MW		 2089static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2090 unsigned char *buffer)
ea73a9f2 2091{
1da177e4 2092 unsigned char cmd[16];
1da177e4
LT		 2093 struct scsi_sense_hdr sshdr;
2094 int sense_valid = 0;
0da205e0 2095 int the_result;
3233ac19 2096 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 2097 unsigned int alignment;
0da205e0
MW		 2098 unsigned long long lba;
2099 unsigned sector_size;
1da177e4 2100
5ce524bd
HG		 2101 if (sdp->no_read_capacity_16)
2102 return -EINVAL;
2103
1da177e4 2104 do {
0da205e0 2105 memset(cmd, 0, 16);
eb846d9f 2106 cmd[0] = SERVICE_ACTION_IN_16;
0da205e0
MW		 2107 cmd[1] = SAI_READ_CAPACITY_16;
2108 cmd[13] = RC16_LEN;
2109 memset(buffer, 0, RC16_LEN);
2110
ea73a9f2 2111 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 2112 buffer, RC16_LEN, &sshdr,
2113 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 2114
ea73a9f2 2115 if (media_not_present(sdkp, &sshdr))
0da205e0 2116 return -ENODEV;
1da177e4 2117
2b301307 2118 if (the_result) {
ea73a9f2 2119 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 2120 if (sense_valid &&
2121 sshdr.sense_key == ILLEGAL_REQUEST &&
2122 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2123 sshdr.ascq == 0x00)
2124 /* Invalid Command Operation Code or
2125 * Invalid Field in CDB, just retry
2126 * silently with RC10 */
2127 return -EINVAL;
3233ac19
JB		 2128 if (sense_valid &&
2129 sshdr.sense_key == UNIT_ATTENTION &&
2130 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2131 /* Device reset might occur several times,
2132 * give it one more chance */
2133 if (--reset_retries > 0)
2134 continue;
2b301307 2135 }
1da177e4
LT		 2136 retries--;
2137
2138 } while (the_result && retries);
2139
0da205e0 2140 if (the_result) {
ef61329d 2141 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
0da205e0
MW		 2142 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2143 return -EINVAL;
2144 }
e73aec82 2145
8f76d151
DH		 2146 sector_size = get_unaligned_be32(&buffer[8]);
2147 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2148
fe542396
MP		 2149 if (sd_read_protection_type(sdkp, buffer) < 0) {
2150 sdkp->capacity = 0;
2151 return -ENODEV;
2152 }
0da205e0
MW		 2153
2154 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2155 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2156 "kernel compiled with support for large block "
2157 "devices.\n");
2158 sdkp->capacity = 0;
2159 return -EOVERFLOW;
2160 }
2161
ea09bcc9 2162 /* Logical blocks per physical block exponent */
526f7c79 2163 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9 2164
89d94756
HR		 2165 /* RC basis */
2166 sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2167
ea09bcc9
MP		 2168 /* Lowest aligned logical block */
2169 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2170 blk_queue_alignment_offset(sdp->request_queue, alignment);
2171 if (alignment && sdkp->first_scan)
2172 sd_printk(KERN_NOTICE, sdkp,
2173 "physical block alignment offset: %u\n", alignment);
2174
c98a0eb0
MP		 2175 if (buffer[14] & 0x80) { /* LBPME */
2176 sdkp->lbpme = 1;
e339c1a7 2177
c98a0eb0
MP		 2178 if (buffer[14] & 0x40) /* LBPRZ */
2179 sdkp->lbprz = 1;
e339c1a7 2180
c98a0eb0 2181 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2182 }
2183
0da205e0
MW		 2184 sdkp->capacity = lba + 1;
2185 return sector_size;
2186}
2187
2188static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2189 unsigned char *buffer)
2190{
2191 unsigned char cmd[16];
2192 struct scsi_sense_hdr sshdr;
2193 int sense_valid = 0;
2194 int the_result;
3233ac19 2195 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2196 sector_t lba;
2197 unsigned sector_size;
2198
2199 do {
2200 cmd[0] = READ_CAPACITY;
2201 memset(&cmd[1], 0, 9);
2202 memset(buffer, 0, 8);
2203
2204 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2205 buffer, 8, &sshdr,
2206 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2207
2208 if (media_not_present(sdkp, &sshdr))
2209 return -ENODEV;
2210
3233ac19 2211 if (the_result) {
0da205e0 2212 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2213 if (sense_valid &&
2214 sshdr.sense_key == UNIT_ATTENTION &&
2215 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2216 /* Device reset might occur several times,
2217 * give it one more chance */
2218 if (--reset_retries > 0)
2219 continue;
2220 }
0da205e0
MW		 2221 retries--;
2222
2223 } while (the_result && retries);
2224
2225 if (the_result) {
ef61329d 2226 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
0da205e0
MW		 2227 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2228 return -EINVAL;
2229 }
2230
8f76d151
DH		 2231 sector_size = get_unaligned_be32(&buffer[4]);
2232 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2233
5ce524bd
HG		 2234 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2235 /* Some buggy (usb cardreader) devices return an lba of
2236 0xffffffff when the want to report a size of 0 (with
2237 which they really mean no media is present) */
2238 sdkp->capacity = 0;
5cc10350 2239 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2240 return sector_size;
2241 }
2242
0da205e0
MW		 2243 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2244 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2245 "kernel compiled with support for large block "
2246 "devices.\n");
2247 sdkp->capacity = 0;
2248 return -EOVERFLOW;
2249 }
2250
2251 sdkp->capacity = lba + 1;
526f7c79 2252 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2253 return sector_size;
2254}
2255
2b301307
MW		 2256static int sd_try_rc16_first(struct scsi_device *sdp)
2257{
f87146bb
HR		 2258 if (sdp->host->max_cmd_len < 16)
2259 return 0;
6a0bdffa
AS		 2260 if (sdp->try_rc_10_first)
2261 return 0;
2b301307
MW		 2262 if (sdp->scsi_level > SCSI_SPC_2)
2263 return 1;
2264 if (scsi_device_protection(sdp))
2265 return 1;
2266 return 0;
2267}
2268
0da205e0
MW		 2269/*
2270 * read disk capacity
2271 */
2272static void
2273sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2274{
2275 int sector_size;
2276 struct scsi_device *sdp = sdkp->device;
2277
2b301307 2278 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2279 sector_size = read_capacity_16(sdkp, sdp, buffer);
2280 if (sector_size == -EOVERFLOW)
1da177e4 2281 goto got_data;
2b301307
MW		 2282 if (sector_size == -ENODEV)
2283 return;
2284 if (sector_size < 0)
2285 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2286 if (sector_size < 0)
2287 return;
1da177e4 2288 } else {
0da205e0
MW		 2289 sector_size = read_capacity_10(sdkp, sdp, buffer);
2290 if (sector_size == -EOVERFLOW)
2291 goto got_data;
2292 if (sector_size < 0)
2293 return;
2294 if ((sizeof(sdkp->capacity) > 4) &&
2295 (sdkp->capacity > 0xffffffffULL)) {
2296 int old_sector_size = sector_size;
2297 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2298 "Trying to use READ CAPACITY(16).\n");
2299 sector_size = read_capacity_16(sdkp, sdp, buffer);
2300 if (sector_size < 0) {
2301 sd_printk(KERN_NOTICE, sdkp,
2302 "Using 0xffffffff as device size\n");
2303 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2304 sector_size = old_sector_size;
2305 goto got_data;
2306 }
2307 }
2308 }
1da177e4 2309
5c211caa
AS		 2310 /* Some devices are known to return the total number of blocks,
2311 * not the highest block number. Some devices have versions
2312 * which do this and others which do not. Some devices we might
2313 * suspect of doing this but we don't know for certain.
2314 *
2315 * If we know the reported capacity is wrong, decrement it. If
2316 * we can only guess, then assume the number of blocks is even
2317 * (usually true but not always) and err on the side of lowering
2318 * the capacity.
2319 */
2320 if (sdp->fix_capacity ||
2321 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2322 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2323 "from its reported value: %llu\n",
2324 (unsigned long long) sdkp->capacity);
1da177e4 2325 --sdkp->capacity;
61bf54b7
ON		 2326 }
2327
1da177e4
LT		 2328got_data:
2329 if (sector_size == 0) {
2330 sector_size = 512;
e73aec82
MP		 2331 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2332 "assuming 512.\n");
1da177e4
LT		 2333 }
2334
2335 if (sector_size != 512 &&
2336 sector_size != 1024 &&
2337 sector_size != 2048 &&
74856fbf 2338 sector_size != 4096) {
e73aec82
MP		 2339 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2340 sector_size);
1da177e4
LT		 2341 /*
2342 * The user might want to re-format the drive with
2343 * a supported sectorsize. Once this happens, it
2344 * would be relatively trivial to set the thing up.
2345 * For this reason, we leave the thing in the table.
2346 */
2347 sdkp->capacity = 0;
2348 /*
2349 * set a bogus sector size so the normal read/write
2350 * logic in the block layer will eventually refuse any
2351 * request on this device without tripping over power
2352 * of two sector size assumptions
2353 */
2354 sector_size = 512;
2355 }
e1defc4f 2356 blk_queue_logical_block_size(sdp->request_queue, sector_size);
89d94756
HR		 2357 blk_queue_physical_block_size(sdp->request_queue,
2358 sdkp->physical_block_size);
2359 sdkp->device->sector_size = sector_size;
7404ad3b 2360
89d94756
HR		 2361 if (sdkp->capacity > 0xffffffff)
2362 sdp->use_16_for_rw = 1;
1da177e4 2363
89d94756 2364}
1da177e4 2365
89d94756
HR		 2366/*
2367 * Print disk capacity
2368 */
2369static void
2370sd_print_capacity(struct scsi_disk *sdkp,
2371 sector_t old_capacity)
2372{
2373 int sector_size = sdkp->device->sector_size;
2374 char cap_str_2[10], cap_str_10[10];
ea09bcc9 2375
89d94756
HR		 2376 string_get_size(sdkp->capacity, sector_size,
2377 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2378 string_get_size(sdkp->capacity, sector_size,
2379 STRING_UNITS_10, cap_str_10,
2380 sizeof(cap_str_10));
1da177e4 2381
89d94756
HR		 2382 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2383 sd_printk(KERN_NOTICE, sdkp,
2384 "%llu %d-byte logical blocks: (%s/%s)\n",
2385 (unsigned long long)sdkp->capacity,
2386 sector_size, cap_str_10, cap_str_2);
53ad570b 2387
89d94756
HR		 2388 if (sdkp->physical_block_size != sector_size)
2389 sd_printk(KERN_NOTICE, sdkp,
2390 "%u-byte physical blocks\n",
2391 sdkp->physical_block_size);
2392
2393 sd_zbc_print_zones(sdkp);
2394 }
1da177e4
LT		 2395}
2396
2397/* called with buffer of length 512 */
2398static inline int
ea73a9f2
JB		 2399sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2400 unsigned char *buffer, int len, struct scsi_mode_data *data,
2401 struct scsi_sense_hdr *sshdr)
1da177e4 2402{
ea73a9f2 2403 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2404 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2405 sshdr);
1da177e4
LT		 2406}
2407
2408/*
2409 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2410 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2411 */
2412static void
e73aec82 2413sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2414{
1da177e4 2415 int res;
ea73a9f2 2416 struct scsi_device *sdp = sdkp->device;
1da177e4 2417 struct scsi_mode_data data;
70a9b873 2418 int old_wp = sdkp->write_prot;
1da177e4
LT		 2419
2420 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2421 if (sdp->skip_ms_page_3f) {
b2bff6ce 2422 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2423 return;
2424 }
2425
ea73a9f2
JB		 2426 if (sdp->use_192_bytes_for_3f) {
2427 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2428 } else {
2429 /*
2430 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2431 * We have to start carefully: some devices hang if we ask
2432 * for more than is available.
2433 */
ea73a9f2 2434 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2435
2436 /*
2437 * Second attempt: ask for page 0 When only page 0 is
2438 * implemented, a request for page 3F may return Sense Key
2439 * 5: Illegal Request, Sense Code 24: Invalid field in
2440 * CDB.
2441 */
2442 if (!scsi_status_is_good(res))
ea73a9f2 2443 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2444
2445 /*
2446 * Third attempt: ask 255 bytes, as we did earlier.
2447 */
2448 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2449 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2450 &data, NULL);
1da177e4
LT		 2451 }
2452
2453 if (!scsi_status_is_good(res)) {
b2bff6ce 2454 sd_first_printk(KERN_WARNING, sdkp,
e73aec82 2455 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2456 } else {
2457 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2458 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2459 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2460 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2461 sdkp->write_prot ? "on" : "off");
df441cc0 2462 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
70a9b873 2463 }
1da177e4
LT		 2464 }
2465}
2466
2467/*
2468 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2469 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2470 */
2471static void
e73aec82 2472sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2473{
1da177e4 2474 int len = 0, res;
ea73a9f2 2475 struct scsi_device *sdp = sdkp->device;
1da177e4 2476
631e8a13
AV		 2477 int dbd;
2478 int modepage;
0bcaa111 2479 int first_len;
1da177e4
LT		 2480 struct scsi_mode_data data;
2481 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2482 int old_wce = sdkp->WCE;
2483 int old_rcd = sdkp->RCD;
2484 int old_dpofua = sdkp->DPOFUA;
1da177e4 2485
39c60a09
JB		 2486
2487 if (sdkp->cache_override)
2488 return;
2489
0bcaa111
LT		 2490 first_len = 4;
2491 if (sdp->skip_ms_page_8) {
2492 if (sdp->type == TYPE_RBC)
2493 goto defaults;
2494 else {
2495 if (sdp->skip_ms_page_3f)
2496 goto defaults;
2497 modepage = 0x3F;
2498 if (sdp->use_192_bytes_for_3f)
2499 first_len = 192;
2500 dbd = 0;
2501 }
2502 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2503 modepage = 6;
2504 dbd = 8;
2505 } else {
2506 modepage = 8;
2507 dbd = 0;
2508 }
2509
1da177e4 2510 /* cautiously ask */
0bcaa111
LT		 2511 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2512 &data, &sshdr);
1da177e4
LT		 2513
2514 if (!scsi_status_is_good(res))
2515 goto bad_sense;
2516
6d73c851
AV		 2517 if (!data.header_length) {
2518 modepage = 6;
0bcaa111 2519 first_len = 0;
b2bff6ce
MP		 2520 sd_first_printk(KERN_ERR, sdkp,
2521 "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2522 }
2523
1da177e4
LT		 2524 /* that went OK, now ask for the proper length */
2525 len = data.length;
2526
2527 /*
2528 * We're only interested in the first three bytes, actually.
2529 * But the data cache page is defined for the first 20.
2530 */
2531 if (len < 3)
2532 goto bad_sense;
0bcaa111 2533 else if (len > SD_BUF_SIZE) {
b2bff6ce 2534 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
0bcaa111
LT		 2535 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2536 len = SD_BUF_SIZE;
2537 }
2538 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2539 len = 192;
1da177e4
LT		 2540
2541 /* Get the data */
0bcaa111
LT		 2542 if (len > first_len)
2543 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2544 &data, &sshdr);
1da177e4
LT		 2545
2546 if (scsi_status_is_good(res)) {
631e8a13 2547 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2548
0bcaa111
LT		 2549 while (offset < len) {
2550 u8 page_code = buffer[offset] & 0x3F;
2551 u8 spf = buffer[offset] & 0x40;
2552
2553 if (page_code == 8 || page_code == 6) {
2554 /* We're interested only in the first 3 bytes.
2555 */
2556 if (len - offset <= 2) {
b2bff6ce
MP		 2557 sd_first_printk(KERN_ERR, sdkp,
2558 "Incomplete mode parameter "
2559 "data\n");
0bcaa111
LT		 2560 goto defaults;
2561 } else {
2562 modepage = page_code;
2563 goto Page_found;
2564 }
2565 } else {
2566 /* Go to the next page */
2567 if (spf && len - offset > 3)
2568 offset += 4 + (buffer[offset+2] << 8) +
2569 buffer[offset+3];
2570 else if (!spf && len - offset > 1)
2571 offset += 2 + buffer[offset+1];
2572 else {
b2bff6ce
MP		 2573 sd_first_printk(KERN_ERR, sdkp,
2574 "Incomplete mode "
2575 "parameter data\n");
0bcaa111
LT		 2576 goto defaults;
2577 }
2578 }
48970800
AV		 2579 }
2580
b2bff6ce 2581 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
984f1733
AS		 2582 goto defaults;
2583
0bcaa111 2584 Page_found:
631e8a13
AV		 2585 if (modepage == 8) {
2586 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2587 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2588 } else {
2589 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2590 sdkp->RCD = 0;
2591 }
1da177e4 2592
007365ad 2593 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
b14bf2d0
AS		 2594 if (sdp->broken_fua) {
2595 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2596 sdkp->DPOFUA = 0;
26f28197
DLM		 2597 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2598 !sdkp->device->use_16_for_rw) {
b2bff6ce 2599 sd_first_printk(KERN_NOTICE, sdkp,
e73aec82 2600 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2601 sdkp->DPOFUA = 0;
2602 }
2603
2eefd57b
SRT		 2604 /* No cache flush allowed for write protected devices */
2605 if (sdkp->WCE && sdkp->write_prot)
2606 sdkp->WCE = 0;
2607
70a9b873
MP		 2608 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2609 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2610 sd_printk(KERN_NOTICE, sdkp,
2611 "Write cache: %s, read cache: %s, %s\n",
2612 sdkp->WCE ? "enabled" : "disabled",
2613 sdkp->RCD ? "disabled" : "enabled",
2614 sdkp->DPOFUA ? "supports DPO and FUA"
2615 : "doesn't support DPO or FUA");
1da177e4
LT		 2616
2617 return;
2618 }
2619
2620bad_sense:
ea73a9f2 2621 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2622 sshdr.sense_key == ILLEGAL_REQUEST &&
2623 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82 2624 /* Invalid field in CDB */
b2bff6ce 2625 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2626 else
b2bff6ce
MP		 2627 sd_first_printk(KERN_ERR, sdkp,
2628 "Asking for cache data failed\n");
1da177e4
LT		 2629
2630defaults:
b81478d8 2631 if (sdp->wce_default_on) {
b2bff6ce
MP		 2632 sd_first_printk(KERN_NOTICE, sdkp,
2633 "Assuming drive cache: write back\n");
b81478d8
NJ		 2634 sdkp->WCE = 1;
2635 } else {
b2bff6ce
MP		 2636 sd_first_printk(KERN_ERR, sdkp,
2637 "Assuming drive cache: write through\n");
b81478d8
NJ		 2638 sdkp->WCE = 0;
2639 }
1da177e4 2640 sdkp->RCD = 0;
48970800 2641 sdkp->DPOFUA = 0;
1da177e4
LT		 2642}
2643
e0597d70
MP		 2644/*
2645 * The ATO bit indicates whether the DIF application tag is available
2646 * for use by the operating system.
2647 */
439d77f7 2648static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2649{
2650 int res, offset;
2651 struct scsi_device *sdp = sdkp->device;
2652 struct scsi_mode_data data;
2653 struct scsi_sense_hdr sshdr;
2654
89d94756 2655 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
e0597d70
MP		 2656 return;
2657
2658 if (sdkp->protection_type == 0)
2659 return;
2660
2661 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2662 SD_MAX_RETRIES, &data, &sshdr);
2663
2664 if (!scsi_status_is_good(res) || !data.header_length ||
2665 data.length < 6) {
b2bff6ce 2666 sd_first_printk(KERN_WARNING, sdkp,
e0597d70
MP		 2667 "getting Control mode page failed, assume no ATO\n");
2668
2669 if (scsi_sense_valid(&sshdr))
2670 sd_print_sense_hdr(sdkp, &sshdr);
2671
2672 return;
2673 }
2674
2675 offset = data.header_length + data.block_descriptor_length;
2676
2677 if ((buffer[offset] & 0x3f) != 0x0a) {
b2bff6ce 2678 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
e0597d70
MP		 2679 return;
2680 }
2681
2682 if ((buffer[offset + 5] & 0x80) == 0)
2683 return;
2684
2685 sdkp->ATO = 1;
2686
2687 return;
2688}
2689
d11b6916
MP		 2690/**
2691 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2692 * @disk: disk to query
2693 */
2694static void sd_read_block_limits(struct scsi_disk *sdkp)
2695{
2696 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2697 const int vpd_len = 64;
e3deec09 2698 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2699
e3deec09
JB		 2700 if (!buffer ||
2701 /* Block Limits VPD */
2702 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2703 goto out;
d11b6916
MP		 2704
2705 blk_queue_io_min(sdkp->disk->queue,
2706 get_unaligned_be16(&buffer[6]) * sector_sz);
ca369d51
MP		 2707
2708 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2709 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
d11b6916 2710
c98a0eb0
MP		 2711 if (buffer[3] == 0x3c) {
2712 unsigned int lba_count, desc_count;
e339c1a7 2713
5db44863 2714 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2715
c98a0eb0 2716 if (!sdkp->lbpme)
045d3fe7 2717 goto out;
045d3fe7 2718
c98a0eb0
MP		 2719 lba_count = get_unaligned_be32(&buffer[20]);
2720 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2721
c98a0eb0
MP		 2722 if (lba_count && desc_count)
2723 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2724
c98a0eb0 2725 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2726
2727 if (buffer[32] & 0x80)
c98a0eb0 2728 sdkp->unmap_alignment =
e339c1a7 2729 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2730
2731 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2732
2733 if (sdkp->max_unmap_blocks)
2734 sd_config_discard(sdkp, SD_LBP_UNMAP);
2735 else
2736 sd_config_discard(sdkp, SD_LBP_WS16);
2737
2738 } else { /* LBP VPD page tells us what to use */
e461338b
MP		 2739 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2740 sd_config_discard(sdkp, SD_LBP_UNMAP);
2741 else if (sdkp->lbpws)
c98a0eb0
MP		 2742 sd_config_discard(sdkp, SD_LBP_WS16);
2743 else if (sdkp->lbpws10)
2744 sd_config_discard(sdkp, SD_LBP_WS10);
7985090a
MP		 2745 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2746 sd_config_discard(sdkp, SD_LBP_UNMAP);
c98a0eb0
MP		 2747 else
2748 sd_config_discard(sdkp, SD_LBP_DISABLE);
2749 }
e339c1a7
MP		 2750 }
2751
e3deec09 2752 out:
d11b6916
MP		 2753 kfree(buffer);
2754}
2755
3821d768
MP		 2756/**
2757 * sd_read_block_characteristics - Query block dev. characteristics
2758 * @disk: disk to query
2759 */
2760static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2761{
89d94756 2762 struct request_queue *q = sdkp->disk->queue;
e3deec09 2763 unsigned char *buffer;
3821d768 2764 u16 rot;
bb2d3de1 2765 const int vpd_len = 64;
3821d768 2766
e3deec09 2767 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2768
e3deec09
JB		 2769 if (!buffer ||
2770 /* Block Device Characteristics VPD */
2771 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2772 goto out;
3821d768
MP		 2773
2774 rot = get_unaligned_be16(&buffer[4]);
2775
b277da0a 2776 if (rot == 1) {
89d94756
HR		 2777 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2778 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
b277da0a 2779 }
3821d768 2780
68af412c
DLM		 2781 if (sdkp->device->type == TYPE_ZBC) {
2782 /* Host-managed */
89d94756 2783 q->limits.zoned = BLK_ZONED_HM;
68af412c
DLM		 2784 } else {
2785 sdkp->zoned = (buffer[8] >> 4) & 3;
2786 if (sdkp->zoned == 1)
2787 /* Host-aware */
2788 q->limits.zoned = BLK_ZONED_HA;
2789 else
2790 /*
2791 * Treat drive-managed devices as
2792 * regular block devices.
2793 */
2794 q->limits.zoned = BLK_ZONED_NONE;
2795 }
89d94756
HR		 2796 if (blk_queue_is_zoned(q) && sdkp->first_scan)
2797 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2798 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2799
e3deec09 2800 out:
3821d768
MP		 2801 kfree(buffer);
2802}
2803
045d3fe7 2804/**
c98a0eb0 2805 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2806 * @disk: disk to query
2807 */
c98a0eb0 2808static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2809{
2810 unsigned char *buffer;
2811 const int vpd_len = 8;
2812
c98a0eb0 2813 if (sdkp->lbpme == 0)
045d3fe7
MP		 2814 return;
2815
2816 buffer = kmalloc(vpd_len, GFP_KERNEL);
2817
2818 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2819 goto out;
2820
c98a0eb0
MP		 2821 sdkp->lbpvpd = 1;
2822 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2823 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2824 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2825
2826 out:
2827 kfree(buffer);
2828}
2829
5db44863
MP		 2830static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2831{
66c28f97
MP		 2832 struct scsi_device *sdev = sdkp->device;
2833
54b2b50c
MP		 2834 if (sdev->host->no_write_same) {
2835 sdev->no_write_same = 1;
2836
2837 return;
2838 }
2839
66c28f97 2840 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af73623f
BS		 2841 /* too large values might cause issues with arcmsr */
2842 int vpd_buf_len = 64;
2843
66c28f97
MP		 2844 sdev->no_report_opcodes = 1;
2845
2846 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2847 * CODES is unsupported and the device has an ATA
2848 * Information VPD page (SAT).
2849 */
af73623f 2850 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
66c28f97
MP		 2851 sdev->no_write_same = 1;
2852 }
2853
2854 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2855 sdkp->ws16 = 1;
66c28f97
MP		 2856
2857 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2858 sdkp->ws10 = 1;
5db44863
MP		 2859}
2860
1da177e4
LT		 2861/**
2862 * sd_revalidate_disk - called the first time a new disk is seen,
2863 * performs disk spin up, read_capacity, etc.
2864 * @disk: struct gendisk we care about
2865 **/
2866static int sd_revalidate_disk(struct gendisk *disk)
2867{
2868 struct scsi_disk *sdkp = scsi_disk(disk);
2869 struct scsi_device *sdp = sdkp->device;
ca369d51 2870 struct request_queue *q = sdkp->disk->queue;
89d94756 2871 sector_t old_capacity = sdkp->capacity;
1da177e4 2872 unsigned char *buffer;
ca369d51 2873 unsigned int dev_max, rw_max;
1da177e4 2874
fa0d34be
MP		 2875 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2876 "sd_revalidate_disk\n"));
1da177e4
LT		 2877
2878 /*
2879 * If the device is offline, don't try and read capacity or any
2880 * of the other niceties.
2881 */
2882 if (!scsi_device_online(sdp))
2883 goto out;
2884
a6123f14 2885 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2886 if (!buffer) {
e73aec82
MP		 2887 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2888 "allocation failure.\n");
ea73a9f2 2889 goto out;
1da177e4
LT		 2890 }
2891
e73aec82 2892 sd_spinup_disk(sdkp);
1da177e4
LT		 2893
2894 /*
2895 * Without media there is no reason to ask; moreover, some devices
2896 * react badly if we do.
2897 */
2898 if (sdkp->media_present) {
e73aec82 2899 sd_read_capacity(sdkp, buffer);
ffd4bc2a 2900
5ddfe085 2901 if (scsi_device_supports_vpd(sdp)) {
c98a0eb0 2902 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2903 sd_read_block_limits(sdkp);
2904 sd_read_block_characteristics(sdkp);
89d94756 2905 sd_zbc_read_zones(sdkp, buffer);
ffd4bc2a
MP		 2906 }
2907
89d94756
HR		 2908 sd_print_capacity(sdkp, old_capacity);
2909
e73aec82
MP		 2910 sd_read_write_protect_flag(sdkp, buffer);
2911 sd_read_cache_type(sdkp, buffer);
e0597d70 2912 sd_read_app_tag_own(sdkp, buffer);
5db44863 2913 sd_read_write_same(sdkp, buffer);
1da177e4 2914 }
461d4e90 2915
70a9b873
MP		 2916 sdkp->first_scan = 0;
2917
461d4e90
TH		 2918 /*
2919 * We now have all cache related info, determine how we deal
4913efe4 2920 * with flush requests.
461d4e90 2921 */
cb2fb68d 2922 sd_set_flush_flag(sdkp);
461d4e90 2923
ca369d51
MP		 2924 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2925 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2926
2927 /* Some devices report a maximum block count for READ/WRITE requests. */
2928 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2929 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2930
2931 /*
2932 * Use the device's preferred I/O size for reads and writes
9c1d9c20
MP		 2933 * unless the reported value is unreasonably small, large, or
2934 * garbage.
ca369d51 2935 */
9c1d9c20
MP		 2936 if (sdkp->opt_xfer_blocks &&
2937 sdkp->opt_xfer_blocks <= dev_max &&
2938 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
6b7e9cde
MP		 2939 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
2940 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2941 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2942 } else
ca369d51 2943 rw_max = BLK_DEF_MAX_SECTORS;
3a9794d3 2944
ca369d51
MP		 2945 /* Combine with controller limits */
2946 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
4f258a46 2947
f08bb1e0 2948 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
5db44863 2949 sd_config_write_same(sdkp);
1da177e4
LT		 2950 kfree(buffer);
2951
1da177e4
LT		 2952 out:
2953 return 0;
2954}
2955
72ec24bd
TH		 2956/**
2957 * sd_unlock_native_capacity - unlock native capacity
2958 * @disk: struct gendisk to set capacity for
2959 *
2960 * Block layer calls this function if it detects that partitions
2961 * on @disk reach beyond the end of the device. If the SCSI host
2962 * implements ->unlock_native_capacity() method, it's invoked to
2963 * give it a chance to adjust the device capacity.
2964 *
2965 * CONTEXT:
2966 * Defined by block layer. Might sleep.
2967 */
2968static void sd_unlock_native_capacity(struct gendisk *disk)
2969{
2970 struct scsi_device *sdev = scsi_disk(disk)->device;
2971
2972 if (sdev->host->hostt->unlock_native_capacity)
2973 sdev->host->hostt->unlock_native_capacity(sdev);
2974}
2975
3e1a7ff8
TH		 2976/**
2977 * sd_format_disk_name - format disk name
2978 * @prefix: name prefix - ie. "sd" for SCSI disks
2979 * @index: index of the disk to format name for
2980 * @buf: output buffer
2981 * @buflen: length of the output buffer
2982 *
2983 * SCSI disk names starts at sda. The 26th device is sdz and the
2984 * 27th is sdaa. The last one for two lettered suffix is sdzz
2985 * which is followed by sdaaa.
2986 *
2987 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2988 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2989 * determined using similar method as 26 base conversion with the
2990 * index shifted -1 after each digit is computed.
2991 *
2992 * CONTEXT:
2993 * Don't care.
2994 *
2995 * RETURNS:
2996 * 0 on success, -errno on failure.
2997 */
2998static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2999{
3000 const int base = 'z' - 'a' + 1;
3001 char *begin = buf + strlen(prefix);
3002 char *end = buf + buflen;
3003 char *p;
3004 int unit;
3005
3006 p = end - 1;
3007 *p = '\0';
3008 unit = base;
3009 do {
3010 if (p == begin)
3011 return -EINVAL;
3012 *--p = 'a' + (index % unit);
3013 index = (index / unit) - 1;
3014 } while (index >= 0);
3015
3016 memmove(begin, p, end - p);
3017 memcpy(buf, prefix, strlen(prefix));
3018
3019 return 0;
3020}
3021
4ace92fc
AV		 3022/*
3023 * The asynchronous part of sd_probe
3024 */
3025static void sd_probe_async(void *data, async_cookie_t cookie)
3026{
3027 struct scsi_disk *sdkp = data;
3028 struct scsi_device *sdp;
3029 struct gendisk *gd;
3030 u32 index;
3031 struct device *dev;
3032
3033 sdp = sdkp->device;
3034 gd = sdkp->disk;
3035 index = sdkp->index;
3036 dev = &sdp->sdev_gendev;
3037
1a03ae0f
MR		 3038 gd->major = sd_major((index & 0xf0) >> 4);
3039 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3040 gd->minors = SD_MINORS;
3041
4ace92fc
AV		 3042 gd->fops = &sd_fops;
3043 gd->private_data = &sdkp->driver;
3044 gd->queue = sdkp->device->request_queue;
3045
70a9b873
MP		 3046 /* defaults, until the device tells us otherwise */
3047 sdp->sector_size = 512;
3048 sdkp->capacity = 0;
3049 sdkp->media_present = 1;
3050 sdkp->write_prot = 0;
39c60a09 3051 sdkp->cache_override = 0;
70a9b873
MP		 3052 sdkp->WCE = 0;
3053 sdkp->RCD = 0;
3054 sdkp->ATO = 0;
3055 sdkp->first_scan = 1;
18a4d0a2 3056 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 3057
4ace92fc
AV		 3058 sd_revalidate_disk(gd);
3059
97fedbbe 3060 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 3061 if (sdp->removable) {
4ace92fc 3062 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 3063 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3064 }
4ace92fc 3065
10c580e4 3066 blk_pm_runtime_init(sdp->request_queue, dev);
0d52c756 3067 device_add_disk(dev, gd);
fe542396
MP		 3068 if (sdkp->capacity)
3069 sd_dif_config_host(sdkp);
4ace92fc 3070
3821d768
MP		 3071 sd_revalidate_disk(gd);
3072
4ace92fc
AV		 3073 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3074 sdp->removable ? "removable " : "");
478a8a05 3075 scsi_autopm_put_device(sdp);
ea038f63 3076 put_device(&sdkp->dev);
4ace92fc
AV		 3077}
3078
0dba1314
DW		 3079struct sd_devt {
3080 int idx;
3081 struct disk_devt disk_devt;
3082};
3083
8bfcd1bf 3084static void sd_devt_release(struct disk_devt *disk_devt)
0dba1314
DW		 3085{
3086 struct sd_devt *sd_devt = container_of(disk_devt, struct sd_devt,
3087 disk_devt);
3088
3089 spin_lock(&sd_index_lock);
3090 ida_remove(&sd_index_ida, sd_devt->idx);
3091 spin_unlock(&sd_index_lock);
3092
3093 kfree(sd_devt);
3094}
3095
1da177e4
LT		 3096/**
3097 * sd_probe - called during driver initialization and whenever a
3098 * new scsi device is attached to the system. It is called once
3099 * for each scsi device (not just disks) present.
3100 * @dev: pointer to device object
3101 *
3102 * Returns 0 if successful (or not interested in this scsi device
3103 * (e.g. scanner)); 1 when there is an error.
3104 *
3105 * Note: this function is invoked from the scsi mid-level.
3106 * This function sets up the mapping between a given
3107 * <host,channel,id,lun> (found in sdp) and new device name
3108 * (e.g. /dev/sda). More precisely it is the block device major
3109 * and minor number that is chosen here.
3110 *
2db93ce8
PU		 3111 * Assume sd_probe is not re-entrant (for time being)
3112 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 3113 **/
3114static int sd_probe(struct device *dev)
3115{
3116 struct scsi_device *sdp = to_scsi_device(dev);
0dba1314 3117 struct sd_devt *sd_devt;
1da177e4
LT		 3118 struct scsi_disk *sdkp;
3119 struct gendisk *gd;
439d77f7 3120 int index;
1da177e4
LT		 3121 int error;
3122
6fe8c1db 3123 scsi_autopm_get_device(sdp);
1da177e4 3124 error = -ENODEV;
89d94756
HR		 3125 if (sdp->type != TYPE_DISK &&
3126 sdp->type != TYPE_ZBC &&
3127 sdp->type != TYPE_MOD &&
3128 sdp->type != TYPE_RBC)
1da177e4
LT		 3129 goto out;
3130
89d94756
HR		 3131#ifndef CONFIG_BLK_DEV_ZONED
3132 if (sdp->type == TYPE_ZBC)
3133 goto out;
3134#endif
9ccfc756 3135 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 3136 "sd_probe\n"));
1da177e4
LT		 3137
3138 error = -ENOMEM;
24669f75 3139 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 3140 if (!sdkp)
3141 goto out;
3142
0dba1314
DW		 3143 sd_devt = kzalloc(sizeof(*sd_devt), GFP_KERNEL);
3144 if (!sd_devt)
3145 goto out_free;
3146
689d6fac 3147 gd = alloc_disk(SD_MINORS);
1da177e4 3148 if (!gd)
0dba1314 3149 goto out_free_devt;
1da177e4 3150
f27bac27
TH		 3151 do {
3152 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3153 goto out_put;
1da177e4 3154
4034cc68 3155 spin_lock(&sd_index_lock);
f27bac27 3156 error = ida_get_new(&sd_index_ida, &index);
4034cc68 3157 spin_unlock(&sd_index_lock);
f27bac27 3158 } while (error == -EAGAIN);
1da177e4 3159
21208ae5
DK		 3160 if (error) {
3161 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 3162 goto out_put;
1a03ae0f
MR		 3163 }
3164
0dba1314
DW		 3165 atomic_set(&sd_devt->disk_devt.count, 1);
3166 sd_devt->disk_devt.release = sd_devt_release;
3167 sd_devt->idx = index;
3168 gd->disk_devt = &sd_devt->disk_devt;
3169
3e1a7ff8 3170 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 3171 if (error) {
3172 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 3173 goto out_free_index;
21208ae5 3174 }
f27bac27 3175
1da177e4
LT		 3176 sdkp->device = sdp;
3177 sdkp->driver = &sd_template;
3178 sdkp->disk = gd;
3179 sdkp->index = index;
409f3499 3180 atomic_set(&sdkp->openers, 0);
9e1a1537 3181 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 3182
601e7638
JB		 3183 if (!sdp->request_queue->rq_timeout) {
3184 if (sdp->type != TYPE_MOD)
3185 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3186 else
3187 blk_queue_rq_timeout(sdp->request_queue,
3188 SD_MOD_TIMEOUT);
3189 }
3190
3191 device_initialize(&sdkp->dev);
478a8a05 3192 sdkp->dev.parent = dev;
601e7638 3193 sdkp->dev.class = &sd_disk_class;
02aa2a37 3194 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
601e7638 3195
dee0586e
DC		 3196 error = device_add(&sdkp->dev);
3197 if (error)
601e7638
JB		 3198 goto out_free_index;
3199
478a8a05
AS		 3200 get_device(dev);
3201 dev_set_drvdata(dev, sdkp);
601e7638 3202
ea038f63 3203 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 3204 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 3205
3206 return 0;
3207
f27bac27 3208 out_free_index:
0dba1314
DW		 3209 put_disk_devt(&sd_devt->disk_devt);
3210 sd_devt = NULL;
6bdaa1f1 3211 out_put:
1da177e4 3212 put_disk(gd);
0dba1314
DW		 3213 out_free_devt:
3214 kfree(sd_devt);
f170396c
CIK		 3215 out_free:
3216 kfree(sdkp);
6bdaa1f1 3217 out:
6fe8c1db 3218 scsi_autopm_put_device(sdp);
1da177e4
LT		 3219 return error;
3220}
3221
3222/**
3223 * sd_remove - called whenever a scsi disk (previously recognized by
3224 * sd_probe) is detached from the system. It is called (potentially
3225 * multiple times) during sd module unload.
f2a3313d 3226 * @dev: pointer to device object
1da177e4
LT		 3227 *
3228 * Note: this function is invoked from the scsi mid-level.
3229 * This function potentially frees up a device name (e.g. /dev/sdc)
3230 * that could be re-used by a subsequent sd_probe().
3231 * This function is not called when the built-in sd driver is "exit-ed".
3232 **/
3233static int sd_remove(struct device *dev)
3234{
601e7638 3235 struct scsi_disk *sdkp;
0761df9c 3236 dev_t devt;
1da177e4 3237
601e7638 3238 sdkp = dev_get_drvdata(dev);
0761df9c 3239 devt = disk_devt(sdkp->disk);
478a8a05
AS		 3240 scsi_autopm_get_device(sdkp->device);
3241
3c31b52f 3242 async_synchronize_full_domain(&scsi_sd_pm_domain);
a7a20d10 3243 async_synchronize_full_domain(&scsi_sd_probe_domain);
ee959b00 3244 device_del(&sdkp->dev);
1da177e4
LT		 3245 del_gendisk(sdkp->disk);
3246 sd_shutdown(dev);
39b7f1e2 3247
89d94756
HR		 3248 sd_zbc_remove(sdkp);
3249
0761df9c
HR		 3250 blk_register_region(devt, SD_MINORS, NULL,
3251 sd_default_probe, NULL, NULL);
3252
0b950672 3253 mutex_lock(&sd_ref_mutex);
39b7f1e2 3254 dev_set_drvdata(dev, NULL);
ee959b00 3255 put_device(&sdkp->dev);
0b950672 3256 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3257
3258 return 0;
3259}
3260
3261/**
3262 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3263 * @dev: pointer to embedded class device
1da177e4 3264 *
0b950672 3265 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3266 * called on last put, you should always use the scsi_disk_get()
3267 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3268 * and never do a direct put_device.
1da177e4 3269 **/
ee959b00 3270static void scsi_disk_release(struct device *dev)
1da177e4 3271{
ee959b00 3272 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3273 struct gendisk *disk = sdkp->disk;
3274
0dba1314 3275 put_disk_devt(disk->disk_devt);
1da177e4 3276 disk->private_data = NULL;
1da177e4 3277 put_disk(disk);
39b7f1e2 3278 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3279
3280 kfree(sdkp);
3281}
3282
cc5d2c8c 3283static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3284{
3285 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3286 struct scsi_sense_hdr sshdr;
cc5d2c8c 3287 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3288 int res;
3289
3290 if (start)
3291 cmd[4] |= 1; /* START */
3292
d2886ea3
SR		 3293 if (sdp->start_stop_pwr_cond)
3294 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3295
c3c94c5a
TH		 3296 if (!scsi_device_online(sdp))
3297 return -ENODEV;
3298
9b21493c 3299 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
e8064021 3300 SD_TIMEOUT, SD_MAX_RETRIES, NULL, 0, RQF_PM);
c3c94c5a 3301 if (res) {
ef61329d 3302 sd_print_result(sdkp, "Start/Stop Unit failed", res);
c3c94c5a 3303 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3304 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 3305 if (scsi_sense_valid(&sshdr) &&
3306 /* 0x3a is medium not present */
3307 sshdr.asc == 0x3a)
3308 res = 0;
c3c94c5a
TH		 3309 }
3310
95897910
ON		 3311 /* SCSI error codes must not go to the generic layer */
3312 if (res)
3313 return -EIO;
3314
3315 return 0;
c3c94c5a
TH		 3316}
3317
1da177e4
LT		 3318/*
3319 * Send a SYNCHRONIZE CACHE instruction down to the device through
3320 * the normal SCSI command structure. Wait for the command to
3321 * complete.
3322 */
3323static void sd_shutdown(struct device *dev)
3324{
3d9a1f53 3325 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1da177e4
LT		 3326
3327 if (!sdkp)
3328 return; /* this can happen */
3329
54f57588 3330 if (pm_runtime_suspended(dev))
3d9a1f53 3331 return;
54f57588 3332
95897910 3333 if (sdkp->WCE && sdkp->media_present) {
e73aec82
MP		 3334 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3335 sd_sync_cache(sdkp);
39b7f1e2 3336 }
c3c94c5a 3337
cc5d2c8c
JB		 3338 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3339 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3340 sd_start_stop_device(sdkp, 0);
c3c94c5a 3341 }
39b7f1e2 3342}
1da177e4 3343
95897910 3344static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
c3c94c5a 3345{
3d9a1f53 3346 struct scsi_disk *sdkp = dev_get_drvdata(dev);
09ff92fe 3347 int ret = 0;
c3c94c5a 3348
13b43891
AS		 3349 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3350 return 0;
c3c94c5a 3351
95897910 3352 if (sdkp->WCE && sdkp->media_present) {
cc5d2c8c 3353 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a 3354 ret = sd_sync_cache(sdkp);
95897910
ON		 3355 if (ret) {
3356 /* ignore OFFLINE device */
3357 if (ret == -ENODEV)
3358 ret = 0;
09ff92fe 3359 goto done;
95897910 3360 }
c3c94c5a
TH		 3361 }
3362
691e3d31 3363 if (sdkp->device->manage_start_stop) {
cc5d2c8c 3364 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
95897910 3365 /* an error is not worth aborting a system sleep */
cc5d2c8c 3366 ret = sd_start_stop_device(sdkp, 0);
95897910
ON		 3367 if (ignore_stop_errors)
3368 ret = 0;
c3c94c5a
TH		 3369 }
3370
09ff92fe 3371done:
09ff92fe 3372 return ret;
c3c94c5a
TH		 3373}
3374
95897910
ON		 3375static int sd_suspend_system(struct device *dev)
3376{
3377 return sd_suspend_common(dev, true);
3378}
3379
3380static int sd_suspend_runtime(struct device *dev)
3381{
3382 return sd_suspend_common(dev, false);
3383}
3384
c3c94c5a
TH		 3385static int sd_resume(struct device *dev)
3386{
3d9a1f53 3387 struct scsi_disk *sdkp = dev_get_drvdata(dev);
c3c94c5a 3388
13b43891
AS		 3389 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3390 return 0;
3391
cc5d2c8c 3392 if (!sdkp->device->manage_start_stop)
3d9a1f53 3393 return 0;
c3c94c5a 3394
cc5d2c8c 3395 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3d9a1f53 3396 return sd_start_stop_device(sdkp, 1);
c3c94c5a
TH		 3397}
3398
1da177e4
LT		 3399/**
3400 * init_sd - entry point for this driver (both when built in or when
3401 * a module).
3402 *
3403 * Note: this function registers this driver with the scsi mid-level.
3404 **/
3405static int __init init_sd(void)
3406{
5e4009ba 3407 int majors = 0, i, err;
1da177e4
LT		 3408
3409 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3410
0761df9c
HR		 3411 for (i = 0; i < SD_MAJORS; i++) {
3412 if (register_blkdev(sd_major(i), "sd") != 0)
3413 continue;
3414 majors++;
3415 blk_register_region(sd_major(i), SD_MINORS, NULL,
3416 sd_default_probe, NULL, NULL);
3417 }
1da177e4
LT		 3418
3419 if (!majors)
3420 return -ENODEV;
3421
5e4009ba
JG		 3422 err = class_register(&sd_disk_class);
3423 if (err)
3424 goto err_out;
6bdaa1f1 3425
4e7392ec
MP		 3426 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3427 0, 0, NULL);
3428 if (!sd_cdb_cache) {
3429 printk(KERN_ERR "sd: can't init extended cdb cache\n");
8d964478 3430 err = -ENOMEM;
4e7392ec
MP		 3431 goto err_out_class;
3432 }
3433
3434 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3435 if (!sd_cdb_pool) {
3436 printk(KERN_ERR "sd: can't init extended cdb pool\n");
8d964478 3437 err = -ENOMEM;
4e7392ec
MP		 3438 goto err_out_cache;
3439 }
3440
afd5e34b
JD		 3441 err = scsi_register_driver(&sd_template.gendrv);
3442 if (err)
3443 goto err_out_driver;
3444
5e4009ba
JG		 3445 return 0;
3446
afd5e34b
JD		 3447err_out_driver:
3448 mempool_destroy(sd_cdb_pool);
3449
4e7392ec
MP		 3450err_out_cache:
3451 kmem_cache_destroy(sd_cdb_cache);
3452
5e4009ba
JG		 3453err_out_class:
3454 class_unregister(&sd_disk_class);
3455err_out:
3456 for (i = 0; i < SD_MAJORS; i++)
3457 unregister_blkdev(sd_major(i), "sd");
3458 return err;
1da177e4
LT		 3459}
3460
3461/**
3462 * exit_sd - exit point for this driver (when it is a module).
3463 *
3464 * Note: this function unregisters this driver from the scsi mid-level.
3465 **/
3466static void __exit exit_sd(void)
3467{
3468 int i;
3469
3470 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3471
afd5e34b 3472 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3473 mempool_destroy(sd_cdb_pool);
3474 kmem_cache_destroy(sd_cdb_cache);
3475
5e4009ba
JG		 3476 class_unregister(&sd_disk_class);
3477
0761df9c
HR		 3478 for (i = 0; i < SD_MAJORS; i++) {
3479 blk_unregister_region(sd_major(i), SD_MINORS);
1da177e4 3480 unregister_blkdev(sd_major(i), "sd");
0761df9c 3481 }
1da177e4
LT		 3482}
3483
1da177e4
LT		 3484module_init(init_sd);
3485module_exit(exit_sd);
e73aec82
MP		 3486
3487static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3488 struct scsi_sense_hdr *sshdr)
3489{
21045519
HR		 3490 scsi_print_sense_hdr(sdkp->device,
3491 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
e73aec82
MP		 3492}
3493
ef61329d
HR		 3494static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3495 int result)
e73aec82 3496{
ef61329d
HR		 3497 const char *hb_string = scsi_hostbyte_string(result);
3498 const char *db_string = scsi_driverbyte_string(result);
3499
3500 if (hb_string || db_string)
3501 sd_printk(KERN_INFO, sdkp,
3502 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3503 hb_string ? hb_string : "invalid",
3504 db_string ? db_string : "invalid");
3505 else
3506 sd_printk(KERN_INFO, sdkp,
3507 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3508 msg, host_byte(result), driver_byte(result));
e73aec82
MP		 3509}
3510
Linux 6.x block layer and io_uring tree(s)