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staging/rdma/hfi1: Convert dd_dev_info() to hfi1_cdbg() in process startup
[deliverable/linux.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>
1da177e4 55#include <asm/uaccess.h>
8f76d151 56#include <asm/unaligned.h>
1da177e4
LT		 57
58#include <scsi/scsi.h>
59#include <scsi/scsi_cmnd.h>
60#include <scsi/scsi_dbg.h>
61#include <scsi/scsi_device.h>
62#include <scsi/scsi_driver.h>
63#include <scsi/scsi_eh.h>
64#include <scsi/scsi_host.h>
65#include <scsi/scsi_ioctl.h>
1da177e4
LT		 66#include <scsi/scsicam.h>
67
aa91696e 68#include "sd.h"
a7a20d10 69#include "scsi_priv.h"
1da177e4
LT		 70#include "scsi_logging.h"
71
f018fa55
RH		 72MODULE_AUTHOR("Eric Youngdale");
73MODULE_DESCRIPTION("SCSI disk (sd) driver");
74MODULE_LICENSE("GPL");
75
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
d7b8bcb0
MT		 92MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
f018fa55 95
870d6656 96#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
f615b48c 97#define SD_MINORS 16
870d6656 98#else
3e1a7ff8 99#define SD_MINORS 0
870d6656
TH		 100#endif
101
c98a0eb0 102static void sd_config_discard(struct scsi_disk *, unsigned int);
5db44863 103static void sd_config_write_same(struct scsi_disk *);
7b3d9545 104static int sd_revalidate_disk(struct gendisk *);
72ec24bd 105static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 106static int sd_probe(struct device *);
107static int sd_remove(struct device *);
108static void sd_shutdown(struct device *);
95897910
ON		 109static int sd_suspend_system(struct device *);
110static int sd_suspend_runtime(struct device *);
7b3d9545
LT		 111static int sd_resume(struct device *);
112static void sd_rescan(struct device *);
a1b73fc1
CH		 113static int sd_init_command(struct scsi_cmnd *SCpnt);
114static void sd_uninit_command(struct scsi_cmnd *SCpnt);
7b3d9545 115static int sd_done(struct scsi_cmnd *);
2451079b 116static int sd_eh_action(struct scsi_cmnd *, int);
7b3d9545 117static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 118static void scsi_disk_release(struct device *cdev);
7b3d9545 119static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
ef61329d 120static void sd_print_result(const struct scsi_disk *, const char *, int);
7b3d9545 121
4034cc68 122static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 123static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 124
125/* This semaphore is used to mediate the 0->1 reference get in the
126 * face of object destruction (i.e. we can't allow a get on an
127 * object after last put) */
0b950672 128static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 129
439d77f7
HS		 130static struct kmem_cache *sd_cdb_cache;
131static mempool_t *sd_cdb_pool;
4e7392ec 132
6bdaa1f1
JB		 133static const char *sd_cache_types[] = {
134 "write through", "none", "write back",
135 "write back, no read (daft)"
136};
137
cb2fb68d
VC		 138static void sd_set_flush_flag(struct scsi_disk *sdkp)
139{
140 unsigned flush = 0;
141
142 if (sdkp->WCE) {
143 flush |= REQ_FLUSH;
144 if (sdkp->DPOFUA)
145 flush |= REQ_FUA;
146 }
147
148 blk_queue_flush(sdkp->disk->queue, flush);
149}
150
ee959b00 151static ssize_t
e1ea2351
GKH		 152cache_type_store(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
6bdaa1f1
JB		 154{
155 int i, ct = -1, rcd, wce, sp;
ee959b00 156 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 157 struct scsi_device *sdp = sdkp->device;
158 char buffer[64];
159 char *buffer_data;
160 struct scsi_mode_data data;
161 struct scsi_sense_hdr sshdr;
2ee3e26c 162 static const char temp[] = "temporary ";
6bdaa1f1
JB		 163 int len;
164
165 if (sdp->type != TYPE_DISK)
166 /* no cache control on RBC devices; theoretically they
167 * can do it, but there's probably so many exceptions
168 * it's not worth the risk */
169 return -EINVAL;
170
39c60a09
JB		 171 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
172 buf += sizeof(temp) - 1;
173 sdkp->cache_override = 1;
174 } else {
175 sdkp->cache_override = 0;
176 }
177
6391a113 178 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 179 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 180 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
181 buf[len] == '\n') {
182 ct = i;
183 break;
184 }
185 }
186 if (ct < 0)
187 return -EINVAL;
188 rcd = ct & 0x01 ? 1 : 0;
2eefd57b 189 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
39c60a09
JB		 190
191 if (sdkp->cache_override) {
192 sdkp->WCE = wce;
193 sdkp->RCD = rcd;
cb2fb68d 194 sd_set_flush_flag(sdkp);
39c60a09
JB		 195 return count;
196 }
197
6bdaa1f1
JB		 198 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
199 SD_MAX_RETRIES, &data, NULL))
200 return -EINVAL;
a9312fb8 201 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 202 data.block_descriptor_length);
203 buffer_data = buffer + data.header_length +
204 data.block_descriptor_length;
205 buffer_data[2] &= ~0x05;
206 buffer_data[2] |= wce << 2 | rcd;
207 sp = buffer_data[0] & 0x80 ? 1 : 0;
2c5d16d6 208 buffer_data[0] &= ~0x80;
6bdaa1f1
JB		 209
210 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
211 SD_MAX_RETRIES, &data, &sshdr)) {
212 if (scsi_sense_valid(&sshdr))
e73aec82 213 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 214 return -EINVAL;
215 }
f98a8cae 216 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 217 return count;
218}
219
ee959b00 220static ssize_t
e1ea2351
GKH		 221manage_start_stop_show(struct device *dev, struct device_attribute *attr,
222 char *buf)
223{
224 struct scsi_disk *sdkp = to_scsi_disk(dev);
225 struct scsi_device *sdp = sdkp->device;
226
227 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
228}
229
230static ssize_t
231manage_start_stop_store(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
c3c94c5a 233{
ee959b00 234 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 235 struct scsi_device *sdp = sdkp->device;
236
237 if (!capable(CAP_SYS_ADMIN))
238 return -EACCES;
239
240 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
241
242 return count;
243}
e1ea2351 244static DEVICE_ATTR_RW(manage_start_stop);
c3c94c5a 245
ee959b00 246static ssize_t
e1ea2351
GKH		 247allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
248{
249 struct scsi_disk *sdkp = to_scsi_disk(dev);
250
251 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
252}
253
254static ssize_t
255allow_restart_store(struct device *dev, struct device_attribute *attr,
256 const char *buf, size_t count)
a144c5ae 257{
ee959b00 258 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 259 struct scsi_device *sdp = sdkp->device;
260
261 if (!capable(CAP_SYS_ADMIN))
262 return -EACCES;
263
264 if (sdp->type != TYPE_DISK)
265 return -EINVAL;
266
267 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
268
269 return count;
270}
e1ea2351 271static DEVICE_ATTR_RW(allow_restart);
a144c5ae 272
ee959b00 273static ssize_t
e1ea2351 274cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 275{
ee959b00 276 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 277 int ct = sdkp->RCD + 2*sdkp->WCE;
278
279 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
280}
e1ea2351 281static DEVICE_ATTR_RW(cache_type);
6bdaa1f1 282
ee959b00 283static ssize_t
e1ea2351 284FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 285{
ee959b00 286 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 287
288 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
289}
e1ea2351 290static DEVICE_ATTR_RO(FUA);
6bdaa1f1 291
ee959b00 292static ssize_t
e1ea2351
GKH		 293protection_type_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
e0597d70
MP		 295{
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
297
298 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
299}
300
8172499a 301static ssize_t
e1ea2351
GKH		 302protection_type_store(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t count)
8172499a
MP		 304{
305 struct scsi_disk *sdkp = to_scsi_disk(dev);
306 unsigned int val;
307 int err;
308
309 if (!capable(CAP_SYS_ADMIN))
310 return -EACCES;
311
312 err = kstrtouint(buf, 10, &val);
313
314 if (err)
315 return err;
316
317 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
318 sdkp->protection_type = val;
319
320 return count;
321}
e1ea2351 322static DEVICE_ATTR_RW(protection_type);
8172499a 323
518fa8e3 324static ssize_t
e1ea2351
GKH		 325protection_mode_show(struct device *dev, struct device_attribute *attr,
326 char *buf)
518fa8e3
MP		 327{
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329 struct scsi_device *sdp = sdkp->device;
330 unsigned int dif, dix;
331
332 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
333 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
334
335 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
336 dif = 0;
337 dix = 1;
338 }
339
340 if (!dif && !dix)
341 return snprintf(buf, 20, "none\n");
342
343 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
344}
e1ea2351 345static DEVICE_ATTR_RO(protection_mode);
518fa8e3 346
e0597d70 347static ssize_t
e1ea2351 348app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
e0597d70
MP		 349{
350 struct scsi_disk *sdkp = to_scsi_disk(dev);
351
352 return snprintf(buf, 20, "%u\n", sdkp->ATO);
353}
e1ea2351 354static DEVICE_ATTR_RO(app_tag_own);
e0597d70 355
e339c1a7 356static ssize_t
e1ea2351
GKH		 357thin_provisioning_show(struct device *dev, struct device_attribute *attr,
358 char *buf)
e339c1a7
MP		 359{
360 struct scsi_disk *sdkp = to_scsi_disk(dev);
361
c98a0eb0
MP		 362 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
363}
e1ea2351 364static DEVICE_ATTR_RO(thin_provisioning);
c98a0eb0
MP		 365
366static const char *lbp_mode[] = {
367 [SD_LBP_FULL] = "full",
368 [SD_LBP_UNMAP] = "unmap",
369 [SD_LBP_WS16] = "writesame_16",
370 [SD_LBP_WS10] = "writesame_10",
371 [SD_LBP_ZERO] = "writesame_zero",
372 [SD_LBP_DISABLE] = "disabled",
373};
374
375static ssize_t
e1ea2351
GKH		 376provisioning_mode_show(struct device *dev, struct device_attribute *attr,
377 char *buf)
c98a0eb0
MP		 378{
379 struct scsi_disk *sdkp = to_scsi_disk(dev);
380
381 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
382}
383
384static ssize_t
e1ea2351
GKH		 385provisioning_mode_store(struct device *dev, struct device_attribute *attr,
386 const char *buf, size_t count)
c98a0eb0
MP		 387{
388 struct scsi_disk *sdkp = to_scsi_disk(dev);
389 struct scsi_device *sdp = sdkp->device;
390
391 if (!capable(CAP_SYS_ADMIN))
392 return -EACCES;
393
394 if (sdp->type != TYPE_DISK)
395 return -EINVAL;
396
397 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
398 sd_config_discard(sdkp, SD_LBP_UNMAP);
399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
400 sd_config_discard(sdkp, SD_LBP_WS16);
401 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
402 sd_config_discard(sdkp, SD_LBP_WS10);
403 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
404 sd_config_discard(sdkp, SD_LBP_ZERO);
405 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
406 sd_config_discard(sdkp, SD_LBP_DISABLE);
407 else
408 return -EINVAL;
409
410 return count;
e339c1a7 411}
e1ea2351 412static DEVICE_ATTR_RW(provisioning_mode);
e339c1a7 413
18a4d0a2 414static ssize_t
e1ea2351
GKH		 415max_medium_access_timeouts_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
18a4d0a2
MP		 417{
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
421}
422
423static ssize_t
e1ea2351
GKH		 424max_medium_access_timeouts_store(struct device *dev,
425 struct device_attribute *attr, const char *buf,
426 size_t count)
18a4d0a2
MP		 427{
428 struct scsi_disk *sdkp = to_scsi_disk(dev);
429 int err;
430
431 if (!capable(CAP_SYS_ADMIN))
432 return -EACCES;
433
434 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
435
436 return err ? err : count;
437}
e1ea2351 438static DEVICE_ATTR_RW(max_medium_access_timeouts);
18a4d0a2 439
5db44863 440static ssize_t
e1ea2351
GKH		 441max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
442 char *buf)
5db44863
MP		 443{
444 struct scsi_disk *sdkp = to_scsi_disk(dev);
445
446 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
447}
448
449static ssize_t
e1ea2351
GKH		 450max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
451 const char *buf, size_t count)
5db44863
MP		 452{
453 struct scsi_disk *sdkp = to_scsi_disk(dev);
454 struct scsi_device *sdp = sdkp->device;
455 unsigned long max;
456 int err;
457
458 if (!capable(CAP_SYS_ADMIN))
459 return -EACCES;
460
461 if (sdp->type != TYPE_DISK)
462 return -EINVAL;
463
464 err = kstrtoul(buf, 10, &max);
465
466 if (err)
467 return err;
468
469 if (max == 0)
470 sdp->no_write_same = 1;
66c28f97
MP		 471 else if (max <= SD_MAX_WS16_BLOCKS) {
472 sdp->no_write_same = 0;
5db44863 473 sdkp->max_ws_blocks = max;
66c28f97 474 }
5db44863
MP		 475
476 sd_config_write_same(sdkp);
477
478 return count;
479}
e1ea2351
GKH		 480static DEVICE_ATTR_RW(max_write_same_blocks);
481
482static struct attribute *sd_disk_attrs[] = {
483 &dev_attr_cache_type.attr,
484 &dev_attr_FUA.attr,
485 &dev_attr_allow_restart.attr,
486 &dev_attr_manage_start_stop.attr,
487 &dev_attr_protection_type.attr,
488 &dev_attr_protection_mode.attr,
489 &dev_attr_app_tag_own.attr,
490 &dev_attr_thin_provisioning.attr,
491 &dev_attr_provisioning_mode.attr,
492 &dev_attr_max_write_same_blocks.attr,
493 &dev_attr_max_medium_access_timeouts.attr,
494 NULL,
6bdaa1f1 495};
e1ea2351 496ATTRIBUTE_GROUPS(sd_disk);
6bdaa1f1
JB		 497
498static struct class sd_disk_class = {
499 .name = "scsi_disk",
500 .owner = THIS_MODULE,
ee959b00 501 .dev_release = scsi_disk_release,
e1ea2351 502 .dev_groups = sd_disk_groups,
6bdaa1f1 503};
1da177e4 504
691e3d31 505static const struct dev_pm_ops sd_pm_ops = {
95897910 506 .suspend = sd_suspend_system,
691e3d31 507 .resume = sd_resume,
95897910 508 .poweroff = sd_suspend_system,
691e3d31 509 .restore = sd_resume,
95897910 510 .runtime_suspend = sd_suspend_runtime,
691e3d31
AL		 511 .runtime_resume = sd_resume,
512};
513
1da177e4 514static struct scsi_driver sd_template = {
1da177e4
LT		 515 .gendrv = {
516 .name = "sd",
3af6b352 517 .owner = THIS_MODULE,
1da177e4
LT		 518 .probe = sd_probe,
519 .remove = sd_remove,
520 .shutdown = sd_shutdown,
691e3d31 521 .pm = &sd_pm_ops,
1da177e4
LT		 522 },
523 .rescan = sd_rescan,
a1b73fc1
CH		 524 .init_command = sd_init_command,
525 .uninit_command = sd_uninit_command,
7b3d9545 526 .done = sd_done,
18a4d0a2 527 .eh_action = sd_eh_action,
1da177e4
LT		 528};
529
0761df9c
HR		 530/*
531 * Dummy kobj_map->probe function.
532 * The default ->probe function will call modprobe, which is
533 * pointless as this module is already loaded.
534 */
535static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
536{
537 return NULL;
538}
539
1da177e4
LT		 540/*
541 * Device no to disk mapping:
542 *
543 * major disc2 disc p1
544 * |............|.............|....|....| <- dev_t
545 * 31 20 19 8 7 4 3 0
546 *
547 * Inside a major, we have 16k disks, however mapped non-
548 * contiguously. The first 16 disks are for major0, the next
549 * ones with major1, ... Disk 256 is for major0 again, disk 272
550 * for major1, ...
551 * As we stay compatible with our numbering scheme, we can reuse
552 * the well-know SCSI majors 8, 65--71, 136--143.
553 */
554static int sd_major(int major_idx)
555{
556 switch (major_idx) {
557 case 0:
558 return SCSI_DISK0_MAJOR;
559 case 1 ... 7:
560 return SCSI_DISK1_MAJOR + major_idx - 1;
561 case 8 ... 15:
562 return SCSI_DISK8_MAJOR + major_idx - 8;
563 default:
564 BUG();
565 return 0; /* shut up gcc */
566 }
567}
568
3d9a1f53 569static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 570{
571 struct scsi_disk *sdkp = NULL;
572
3d9a1f53
CH		 573 mutex_lock(&sd_ref_mutex);
574
39b7f1e2
AS		 575 if (disk->private_data) {
576 sdkp = scsi_disk(disk);
577 if (scsi_device_get(sdkp->device) == 0)
ee959b00 578 get_device(&sdkp->dev);
39b7f1e2
AS		 579 else
580 sdkp = NULL;
581 }
0b950672 582 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 583 return sdkp;
584}
585
586static void scsi_disk_put(struct scsi_disk *sdkp)
587{
588 struct scsi_device *sdev = sdkp->device;
589
0b950672 590 mutex_lock(&sd_ref_mutex);
ee959b00 591 put_device(&sdkp->dev);
1da177e4 592 scsi_device_put(sdev);
0b950672 593 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 594}
595
c611529e
MP		 596static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
597 unsigned int dix, unsigned int dif)
35e1a5d9 598{
c611529e
MP		 599 struct bio *bio = scmd->request->bio;
600 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
601 unsigned int protect = 0;
602
603 if (dix) { /* DIX Type 0, 1, 2, 3 */
604 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
605 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
606
607 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
608 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
609 }
610
611 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
612 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
613
614 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
615 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
616 }
617
618 if (dif) { /* DIX/DIF Type 1, 2, 3 */
619 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
620
621 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
622 protect = 3 << 5; /* Disable target PI checking */
623 else
624 protect = 1 << 5; /* Enable target PI checking */
35e1a5d9
MP		 625 }
626
627 scsi_set_prot_op(scmd, prot_op);
628 scsi_set_prot_type(scmd, dif);
c611529e
MP		 629 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
630
631 return protect;
35e1a5d9
MP		 632}
633
c98a0eb0
MP		 634static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
635{
636 struct request_queue *q = sdkp->disk->queue;
637 unsigned int logical_block_size = sdkp->device->sector_size;
638 unsigned int max_blocks = 0;
639
7985090a 640 q->limits.discard_zeroes_data = 0;
2a8cfad0
MP		 641 q->limits.discard_alignment = sdkp->unmap_alignment *
642 logical_block_size;
c98a0eb0
MP		 643 q->limits.discard_granularity =
644 max(sdkp->physical_block_size,
645 sdkp->unmap_granularity * logical_block_size);
646
89730393
MP		 647 sdkp->provisioning_mode = mode;
648
c98a0eb0
MP		 649 switch (mode) {
650
651 case SD_LBP_DISABLE:
2bb4cd5c 652 blk_queue_max_discard_sectors(q, 0);
c98a0eb0
MP		 653 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
654 return;
655
656 case SD_LBP_UNMAP:
5db44863
MP		 657 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
658 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 659 break;
660
661 case SD_LBP_WS16:
5db44863
MP		 662 max_blocks = min_not_zero(sdkp->max_ws_blocks,
663 (u32)SD_MAX_WS16_BLOCKS);
7985090a 664 q->limits.discard_zeroes_data = sdkp->lbprz;
c98a0eb0
MP		 665 break;
666
667 case SD_LBP_WS10:
5db44863
MP		 668 max_blocks = min_not_zero(sdkp->max_ws_blocks,
669 (u32)SD_MAX_WS10_BLOCKS);
7985090a 670 q->limits.discard_zeroes_data = sdkp->lbprz;
c98a0eb0
MP		 671 break;
672
673 case SD_LBP_ZERO:
5db44863
MP		 674 max_blocks = min_not_zero(sdkp->max_ws_blocks,
675 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 676 q->limits.discard_zeroes_data = 1;
677 break;
678 }
679
2bb4cd5c 680 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
c98a0eb0 681 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 682}
683
e339c1a7 684/**
26e85fcd 685 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
66ac0280 686 * @sdp: scsi device to operate one
e339c1a7
MP		 687 * @rq: Request to prepare
688 *
689 * Will issue either UNMAP or WRITE SAME(16) depending on preference
690 * indicated by target device.
691 **/
6a7b4398 692static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
e339c1a7 693{
6a7b4398
CH		 694 struct request *rq = cmd->request;
695 struct scsi_device *sdp = cmd->device;
e339c1a7 696 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 697 sector_t sector = blk_rq_pos(rq);
698 unsigned int nr_sectors = blk_rq_sectors(rq);
699 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 700 unsigned int len;
f1126e95 701 int ret;
c98a0eb0 702 char *buf;
66ac0280 703 struct page *page;
e339c1a7 704
26e85fcd
MP		 705 sector >>= ilog2(sdp->sector_size) - 9;
706 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7 707
66ac0280
CH		 708 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
709 if (!page)
710 return BLKPREP_DEFER;
711
c98a0eb0
MP		 712 switch (sdkp->provisioning_mode) {
713 case SD_LBP_UNMAP:
714 buf = page_address(page);
e339c1a7 715
6a7b4398
CH		 716 cmd->cmd_len = 10;
717 cmd->cmnd[0] = UNMAP;
718 cmd->cmnd[8] = 24;
e339c1a7
MP		 719
720 put_unaligned_be16(6 + 16, &buf[0]);
721 put_unaligned_be16(16, &buf[2]);
722 put_unaligned_be64(sector, &buf[8]);
66ac0280 723 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 724
66ac0280 725 len = 24;
c98a0eb0
MP		 726 break;
727
728 case SD_LBP_WS16:
6a7b4398
CH		 729 cmd->cmd_len = 16;
730 cmd->cmnd[0] = WRITE_SAME_16;
731 cmd->cmnd[1] = 0x8; /* UNMAP */
732 put_unaligned_be64(sector, &cmd->cmnd[2]);
733 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
66ac0280
CH		 734
735 len = sdkp->device->sector_size;
c98a0eb0
MP		 736 break;
737
738 case SD_LBP_WS10:
739 case SD_LBP_ZERO:
6a7b4398
CH		 740 cmd->cmd_len = 10;
741 cmd->cmnd[0] = WRITE_SAME;
c98a0eb0 742 if (sdkp->provisioning_mode == SD_LBP_WS10)
6a7b4398
CH		 743 cmd->cmnd[1] = 0x8; /* UNMAP */
744 put_unaligned_be32(sector, &cmd->cmnd[2]);
745 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
c98a0eb0
MP		 746
747 len = sdkp->device->sector_size;
748 break;
749
750 default:
09b9cc44 751 ret = BLKPREP_KILL;
c98a0eb0 752 goto out;
e339c1a7
MP		 753 }
754
dc4a9307 755 rq->completion_data = page;
6a7b4398
CH		 756 rq->timeout = SD_TIMEOUT;
757
758 cmd->transfersize = len;
e4200f8e 759 cmd->allowed = SD_MAX_RETRIES;
6a7b4398
CH		 760
761 /*
762 * Initially __data_len is set to the amount of data that needs to be
763 * transferred to the target. This amount depends on whether WRITE SAME
764 * or UNMAP is being used. After the scatterlist has been mapped by
765 * scsi_init_io() we set __data_len to the size of the area to be
766 * discarded on disk. This allows us to report completion on the full
767 * amount of blocks described by the request.
768 */
66ac0280 769 blk_add_request_payload(rq, page, len);
3c356bde 770 ret = scsi_init_io(cmd);
26e85fcd 771 rq->__data_len = nr_bytes;
c98a0eb0
MP		 772
773out:
b4f42e28 774 if (ret != BLKPREP_OK)
610a6349 775 __free_page(page);
f1126e95
FT		 776 return ret;
777}
778
5db44863
MP		 779static void sd_config_write_same(struct scsi_disk *sdkp)
780{
781 struct request_queue *q = sdkp->disk->queue;
782 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 783
784 if (sdkp->device->no_write_same) {
785 sdkp->max_ws_blocks = 0;
786 goto out;
787 }
788
789 /* Some devices can not handle block counts above 0xffff despite
790 * supporting WRITE SAME(16). Consequently we default to 64k
791 * blocks per I/O unless the device explicitly advertises a
792 * bigger limit.
793 */
66c28f97
MP		 794 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
795 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
796 (u32)SD_MAX_WS16_BLOCKS);
797 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
798 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
799 (u32)SD_MAX_WS10_BLOCKS);
800 else {
801 sdkp->device->no_write_same = 1;
802 sdkp->max_ws_blocks = 0;
803 }
5db44863
MP		 804
805out:
66c28f97
MP		 806 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
807 (logical_block_size >> 9));
5db44863
MP		 808}
809
810/**
811 * sd_setup_write_same_cmnd - write the same data to multiple blocks
59b1134c 812 * @cmd: command to prepare
5db44863
MP		 813 *
814 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
815 * preference indicated by target device.
816 **/
59b1134c 817static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
5db44863 818{
59b1134c
CH		 819 struct request *rq = cmd->request;
820 struct scsi_device *sdp = cmd->device;
5db44863
MP		 821 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
822 struct bio *bio = rq->bio;
823 sector_t sector = blk_rq_pos(rq);
824 unsigned int nr_sectors = blk_rq_sectors(rq);
825 unsigned int nr_bytes = blk_rq_bytes(rq);
826 int ret;
827
828 if (sdkp->device->no_write_same)
829 return BLKPREP_KILL;
830
a4ad39b1 831 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
5db44863
MP		 832
833 sector >>= ilog2(sdp->sector_size) - 9;
834 nr_sectors >>= ilog2(sdp->sector_size) - 9;
835
5db44863 836 rq->timeout = SD_WRITE_SAME_TIMEOUT;
5db44863
MP		 837
838 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
59b1134c
CH		 839 cmd->cmd_len = 16;
840 cmd->cmnd[0] = WRITE_SAME_16;
841 put_unaligned_be64(sector, &cmd->cmnd[2]);
842 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
5db44863 843 } else {
59b1134c
CH		 844 cmd->cmd_len = 10;
845 cmd->cmnd[0] = WRITE_SAME;
846 put_unaligned_be32(sector, &cmd->cmnd[2]);
847 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
5db44863
MP		 848 }
849
59b1134c 850 cmd->transfersize = sdp->sector_size;
a25ee548 851 cmd->allowed = SD_MAX_RETRIES;
5db44863 852
59b1134c
CH		 853 /*
854 * For WRITE_SAME the data transferred in the DATA IN buffer is
855 * different from the amount of data actually written to the target.
856 *
857 * We set up __data_len to the amount of data transferred from the
858 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
859 * to transfer a single sector of data first, but then reset it to
860 * the amount of data to be written right after so that the I/O path
861 * knows how much to actually write.
862 */
863 rq->__data_len = sdp->sector_size;
3c356bde 864 ret = scsi_init_io(cmd);
59b1134c 865 rq->__data_len = nr_bytes;
5db44863
MP		 866 return ret;
867}
868
a118c6c1 869static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
90467c29 870{
a118c6c1
CH		 871 struct request *rq = cmd->request;
872
873 /* flush requests don't perform I/O, zero the S/G table */
874 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
90467c29 875
a118c6c1
CH		 876 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
877 cmd->cmd_len = 10;
878 cmd->transfersize = 0;
879 cmd->allowed = SD_MAX_RETRIES;
880
26b9fd8b 881 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
a118c6c1 882 return BLKPREP_OK;
90467c29
FT		 883}
884
87949eee 885static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1da177e4 886{
a1b73fc1
CH		 887 struct request *rq = SCpnt->request;
888 struct scsi_device *sdp = SCpnt->device;
776b23a0 889 struct gendisk *disk = rq->rq_disk;
af55ff67 890 struct scsi_disk *sdkp;
83096ebf 891 sector_t block = blk_rq_pos(rq);
18351070 892 sector_t threshold;
83096ebf 893 unsigned int this_count = blk_rq_sectors(rq);
c611529e
MP		 894 unsigned int dif, dix;
895 int ret;
4e7392ec 896 unsigned char protect;
7f9a6bc4 897
3c356bde 898 ret = scsi_init_io(SCpnt);
7f9a6bc4
JB		 899 if (ret != BLKPREP_OK)
900 goto out;
901 SCpnt = rq->special;
af55ff67 902 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 903
904 /* from here on until we're complete, any goto out
905 * is used for a killable error condition */
906 ret = BLKPREP_KILL;
1da177e4 907
a1b73fc1
CH		 908 SCSI_LOG_HLQUEUE(1,
909 scmd_printk(KERN_INFO, SCpnt,
910 "%s: block=%llu, count=%d\n",
911 __func__, (unsigned long long)block, this_count));
1da177e4
LT		 912
913 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 914 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 915 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 916 "Finishing %u sectors\n",
917 blk_rq_sectors(rq)));
fa0d34be
MP		 918 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
919 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 920 goto out;
1da177e4
LT		 921 }
922
923 if (sdp->changed) {
924 /*
925 * quietly refuse to do anything to a changed disc until
926 * the changed bit has been reset
927 */
3ff5588d 928 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 929 goto out;
1da177e4 930 }
7f9a6bc4 931
a0899d4d 932 /*
18351070
LT		 933 * Some SD card readers can't handle multi-sector accesses which touch
934 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 935 */
18351070
LT		 936 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
937 (sdp->sector_size / 512);
938
939 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
940 if (block < threshold) {
941 /* Access up to the threshold but not beyond */
942 this_count = threshold - block;
943 } else {
944 /* Access only a single hardware sector */
945 this_count = sdp->sector_size / 512;
946 }
947 }
a0899d4d 948
fa0d34be
MP		 949 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
950 (unsigned long long)block));
1da177e4
LT		 951
952 /*
953 * If we have a 1K hardware sectorsize, prevent access to single
954 * 512 byte sectors. In theory we could handle this - in fact
955 * the scsi cdrom driver must be able to handle this because
956 * we typically use 1K blocksizes, and cdroms typically have
957 * 2K hardware sectorsizes. Of course, things are simpler
958 * with the cdrom, since it is read-only. For performance
959 * reasons, the filesystems should be able to handle this
960 * and not force the scsi disk driver to use bounce buffers
961 * for this.
962 */
963 if (sdp->sector_size == 1024) {
83096ebf 964 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 965 scmd_printk(KERN_ERR, SCpnt,
966 "Bad block number requested\n");
7f9a6bc4 967 goto out;
1da177e4
LT		 968 } else {
969 block = block >> 1;
970 this_count = this_count >> 1;
971 }
972 }
973 if (sdp->sector_size == 2048) {
83096ebf 974 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 975 scmd_printk(KERN_ERR, SCpnt,
976 "Bad block number requested\n");
7f9a6bc4 977 goto out;
1da177e4
LT		 978 } else {
979 block = block >> 2;
980 this_count = this_count >> 2;
981 }
982 }
983 if (sdp->sector_size == 4096) {
83096ebf 984 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 985 scmd_printk(KERN_ERR, SCpnt,
986 "Bad block number requested\n");
7f9a6bc4 987 goto out;
1da177e4
LT		 988 } else {
989 block = block >> 3;
990 this_count = this_count >> 3;
991 }
992 }
993 if (rq_data_dir(rq) == WRITE) {
1da177e4 994 SCpnt->cmnd[0] = WRITE_6;
af55ff67 995
8c579ab6 996 if (blk_integrity_rq(rq))
c611529e 997 sd_dif_prepare(SCpnt);
af55ff67 998
1da177e4
LT		 999 } else if (rq_data_dir(rq) == READ) {
1000 SCpnt->cmnd[0] = READ_6;
1da177e4 1001 } else {
5953316d 1002 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
7f9a6bc4 1003 goto out;
1da177e4
LT		 1004 }
1005
fa0d34be 1006 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 1007 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1008 (rq_data_dir(rq) == WRITE) ?
1009 "writing" : "reading", this_count,
83096ebf 1010 blk_rq_sectors(rq)));
1da177e4 1011
c611529e
MP		 1012 dix = scsi_prot_sg_count(SCpnt);
1013 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1014
1015 if (dif || dix)
1016 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
af55ff67 1017 else
4e7392ec
MP		 1018 protect = 0;
1019
c611529e 1020 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
4e7392ec
MP		 1021 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1022
1023 if (unlikely(SCpnt->cmnd == NULL)) {
1024 ret = BLKPREP_DEFER;
1025 goto out;
1026 }
af55ff67 1027
4e7392ec
MP		 1028 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1029 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1030 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1031 SCpnt->cmnd[7] = 0x18;
1032 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1033 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1034
1035 /* LBA */
1036 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1037 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1038 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1039 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1040 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1041 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1042 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1043 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1044
1045 /* Expected Indirect LBA */
1046 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1047 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1048 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1049 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1050
1051 /* Transfer length */
1052 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1053 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1054 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1055 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
e430cbc8 1056 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1da177e4 1057 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1058 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1059 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1060 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1061 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1062 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1063 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1064 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1065 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1066 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1067 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1068 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1069 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1070 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1071 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1072 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1073 scsi_device_protection(SCpnt->device) ||
1da177e4 1074 SCpnt->device->use_10_for_rw) {
1da177e4 1075 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1076 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1077 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1078 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1079 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1080 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1081 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1082 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1083 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1084 } else {
33659ebb 1085 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1086 /*
1087 * This happens only if this drive failed
1088 * 10byte rw command with ILLEGAL_REQUEST
1089 * during operation and thus turned off
1090 * use_10_for_rw.
1091 */
e73aec82
MP		 1092 scmd_printk(KERN_ERR, SCpnt,
1093 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1094 goto out;
007365ad
TH		 1095 }
1096
1da177e4
LT		 1097 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1098 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1099 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1100 SCpnt->cmnd[4] = (unsigned char) this_count;
1101 SCpnt->cmnd[5] = 0;
1102 }
30b0c37b 1103 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4
LT		 1104
1105 /*
1106 * We shouldn't disconnect in the middle of a sector, so with a dumb
1107 * host adapter, it's safe to assume that we can at least transfer
1108 * this many bytes between each connect / disconnect.
1109 */
1110 SCpnt->transfersize = sdp->sector_size;
1111 SCpnt->underflow = this_count << 9;
1112 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1113
1da177e4
LT		 1114 /*
1115 * This indicates that the command is ready from our end to be
1116 * queued.
1117 */
7f9a6bc4
JB		 1118 ret = BLKPREP_OK;
1119 out:
a1b73fc1 1120 return ret;
1da177e4
LT		 1121}
1122
87949eee
CH		 1123static int sd_init_command(struct scsi_cmnd *cmd)
1124{
1125 struct request *rq = cmd->request;
1126
1127 if (rq->cmd_flags & REQ_DISCARD)
1128 return sd_setup_discard_cmnd(cmd);
1129 else if (rq->cmd_flags & REQ_WRITE_SAME)
1130 return sd_setup_write_same_cmnd(cmd);
1131 else if (rq->cmd_flags & REQ_FLUSH)
1132 return sd_setup_flush_cmnd(cmd);
1133 else
1134 return sd_setup_read_write_cmnd(cmd);
1135}
1136
1137static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1138{
1139 struct request *rq = SCpnt->request;
1140
1141 if (rq->cmd_flags & REQ_DISCARD)
1142 __free_page(rq->completion_data);
1143
1144 if (SCpnt->cmnd != rq->cmd) {
1145 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1146 SCpnt->cmnd = NULL;
1147 SCpnt->cmd_len = 0;
1148 }
1149}
1150
1da177e4
LT		 1151/**
1152 * sd_open - open a scsi disk device
1153 * @inode: only i_rdev member may be used
1154 * @filp: only f_mode and f_flags may be used
1155 *
1156 * Returns 0 if successful. Returns a negated errno value in case
1157 * of error.
1158 *
1159 * Note: This can be called from a user context (e.g. fsck(1) )
1160 * or from within the kernel (e.g. as a result of a mount(1) ).
1161 * In the latter case @inode and @filp carry an abridged amount
1162 * of information as noted above.
409f3499
AB		 1163 *
1164 * Locking: called with bdev->bd_mutex held.
1da177e4 1165 **/
0338e291 1166static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1167{
0338e291 1168 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1169 struct scsi_device *sdev;
1170 int retval;
1171
0338e291 1172 if (!sdkp)
1da177e4
LT		 1173 return -ENXIO;
1174
fa0d34be 1175 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1176
1177 sdev = sdkp->device;
1178
1179 /*
1180 * If the device is in error recovery, wait until it is done.
1181 * If the device is offline, then disallow any access to it.
1182 */
1183 retval = -ENXIO;
1184 if (!scsi_block_when_processing_errors(sdev))
1185 goto error_out;
1186
1187 if (sdev->removable || sdkp->write_prot)
0338e291 1188 check_disk_change(bdev);
1da177e4
LT		 1189
1190 /*
1191 * If the drive is empty, just let the open fail.
1192 */
1193 retval = -ENOMEDIUM;
0338e291 1194 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1195 goto error_out;
1196
1197 /*
1198 * If the device has the write protect tab set, have the open fail
1199 * if the user expects to be able to write to the thing.
1200 */
1201 retval = -EROFS;
0338e291 1202 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1203 goto error_out;
1204
1205 /*
1206 * It is possible that the disk changing stuff resulted in
1207 * the device being taken offline. If this is the case,
1208 * report this to the user, and don't pretend that the
1209 * open actually succeeded.
1210 */
1211 retval = -ENXIO;
1212 if (!scsi_device_online(sdev))
1213 goto error_out;
1214
409f3499 1215 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1216 if (scsi_block_when_processing_errors(sdev))
1217 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1218 }
1219
1220 return 0;
1221
1222error_out:
1223 scsi_disk_put(sdkp);
1224 return retval;
1225}
1226
1227/**
1228 * sd_release - invoked when the (last) close(2) is called on this
1229 * scsi disk.
1230 * @inode: only i_rdev member may be used
1231 * @filp: only f_mode and f_flags may be used
1232 *
1233 * Returns 0.
1234 *
1235 * Note: may block (uninterruptible) if error recovery is underway
1236 * on this disk.
409f3499
AB		 1237 *
1238 * Locking: called with bdev->bd_mutex held.
1da177e4 1239 **/
db2a144b 1240static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1241{
1da177e4
LT		 1242 struct scsi_disk *sdkp = scsi_disk(disk);
1243 struct scsi_device *sdev = sdkp->device;
1244
56937f7b 1245 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1246
7e443312 1247 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1248 if (scsi_block_when_processing_errors(sdev))
1249 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1250 }
1251
1252 /*
1253 * XXX and what if there are packets in flight and this close()
1254 * XXX is followed by a "rmmod sd_mod"?
1255 */
478a8a05 1256
1da177e4 1257 scsi_disk_put(sdkp);
1da177e4
LT		 1258}
1259
a885c8c4 1260static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1261{
1262 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1263 struct scsi_device *sdp = sdkp->device;
1264 struct Scsi_Host *host = sdp->host;
1265 int diskinfo[4];
1266
1267 /* default to most commonly used values */
1268 diskinfo[0] = 0x40; /* 1 << 6 */
1269 diskinfo[1] = 0x20; /* 1 << 5 */
1270 diskinfo[2] = sdkp->capacity >> 11;
1271
1272 /* override with calculated, extended default, or driver values */
1273 if (host->hostt->bios_param)
1274 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1275 else
1276 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1277
a885c8c4
CH		 1278 geo->heads = diskinfo[0];
1279 geo->sectors = diskinfo[1];
1280 geo->cylinders = diskinfo[2];
1da177e4
LT		 1281 return 0;
1282}
1283
1284/**
1285 * sd_ioctl - process an ioctl
1286 * @inode: only i_rdev/i_bdev members may be used
1287 * @filp: only f_mode and f_flags may be used
1288 * @cmd: ioctl command number
1289 * @arg: this is third argument given to ioctl(2) system call.
1290 * Often contains a pointer.
1291 *
25985edc 1292 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1293 * success as well). Returns a negated errno value in case of error.
1294 *
1295 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1296 * down in the scsi subsystem.
1da177e4 1297 **/
0338e291 1298static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1299 unsigned int cmd, unsigned long arg)
1300{
1da177e4 1301 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1302 struct scsi_disk *sdkp = scsi_disk(disk);
1303 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1304 void __user *p = (void __user *)arg;
1305 int error;
1306
fe2d1851
NN		 1307 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1308 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1309
0bfc96cb
PB		 1310 error = scsi_verify_blk_ioctl(bdev, cmd);
1311 if (error < 0)
1312 return error;
1313
1da177e4
LT		 1314 /*
1315 * If we are in the middle of error recovery, don't let anyone
1316 * else try and use this device. Also, if error recovery fails, it
1317 * may try and take the device offline, in which case all further
1318 * access to the device is prohibited.
1319 */
906d15fb
CH		 1320 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1321 (mode & FMODE_NDELAY) != 0);
1322 if (error)
8a6cfeb6 1323 goto out;
1da177e4 1324
1da177e4
LT		 1325 /*
1326 * Send SCSI addressing ioctls directly to mid level, send other
1327 * ioctls to block level and then onto mid level if they can't be
1328 * resolved.
1329 */
1330 switch (cmd) {
1331 case SCSI_IOCTL_GET_IDLUN:
1332 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1333 error = scsi_ioctl(sdp, cmd, p);
1334 break;
1da177e4 1335 default:
577ebb37 1336 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1337 if (error != -ENOTTY)
8a6cfeb6
AB		 1338 break;
1339 error = scsi_ioctl(sdp, cmd, p);
1340 break;
1da177e4 1341 }
8a6cfeb6 1342out:
8a6cfeb6 1343 return error;
1da177e4
LT		 1344}
1345
1346static void set_media_not_present(struct scsi_disk *sdkp)
1347{
2bae0093
TH		 1348 if (sdkp->media_present)
1349 sdkp->device->changed = 1;
1350
1351 if (sdkp->device->removable) {
1352 sdkp->media_present = 0;
1353 sdkp->capacity = 0;
1354 }
1355}
1356
1357static int media_not_present(struct scsi_disk *sdkp,
1358 struct scsi_sense_hdr *sshdr)
1359{
1360 if (!scsi_sense_valid(sshdr))
1361 return 0;
1362
1363 /* not invoked for commands that could return deferred errors */
1364 switch (sshdr->sense_key) {
1365 case UNIT_ATTENTION:
1366 case NOT_READY:
1367 /* medium not present */
1368 if (sshdr->asc == 0x3A) {
1369 set_media_not_present(sdkp);
1370 return 1;
1371 }
1372 }
1373 return 0;
1da177e4
LT		 1374}
1375
1376/**
2bae0093
TH		 1377 * sd_check_events - check media events
1378 * @disk: kernel device descriptor
1379 * @clearing: disk events currently being cleared
1da177e4 1380 *
2bae0093 1381 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1382 *
1383 * Note: this function is invoked from the block subsystem.
1384 **/
2bae0093 1385static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1386{
1387 struct scsi_disk *sdkp = scsi_disk(disk);
1388 struct scsi_device *sdp = sdkp->device;
001aac25 1389 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1390 int retval;
1391
2bae0093 1392 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1393
1394 /*
1395 * If the device is offline, don't send any commands - just pretend as
1396 * if the command failed. If the device ever comes back online, we
1397 * can deal with it then. It is only because of unrecoverable errors
1398 * that we would ever take a device offline in the first place.
1399 */
285e9670
KS		 1400 if (!scsi_device_online(sdp)) {
1401 set_media_not_present(sdkp);
285e9670
KS		 1402 goto out;
1403 }
1da177e4
LT		 1404
1405 /*
1406 * Using TEST_UNIT_READY enables differentiation between drive with
1407 * no cartridge loaded - NOT READY, drive with changed cartridge -
1408 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1409 *
1410 * Drives that auto spin down. eg iomega jaz 1G, will be started
1411 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1412 * sd_revalidate() is called.
1413 */
1414 retval = -ENODEV;
285e9670 1415
001aac25
JB		 1416 if (scsi_block_when_processing_errors(sdp)) {
1417 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1418 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1419 sshdr);
1420 }
1da177e4 1421
2bae0093
TH		 1422 /* failed to execute TUR, assume media not present */
1423 if (host_byte(retval)) {
285e9670 1424 set_media_not_present(sdkp);
285e9670
KS		 1425 goto out;
1426 }
1da177e4 1427
2bae0093
TH		 1428 if (media_not_present(sdkp, sshdr))
1429 goto out;
1430
1da177e4
LT		 1431 /*
1432 * For removable scsi disk we have to recognise the presence
2bae0093 1433 * of a disk in the drive.
1da177e4 1434 */
2bae0093
TH		 1435 if (!sdkp->media_present)
1436 sdp->changed = 1;
1da177e4 1437 sdkp->media_present = 1;
285e9670 1438out:
3ff5588d 1439 /*
2bae0093 1440 * sdp->changed is set under the following conditions:
3ff5588d 1441 *
2bae0093
TH		 1442 * Medium present state has changed in either direction.
1443 * Device has indicated UNIT_ATTENTION.
3ff5588d 1444 */
001aac25 1445 kfree(sshdr);
2bae0093
TH		 1446 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1447 sdp->changed = 0;
1da177e4 1448 return retval;
1da177e4
LT		 1449}
1450
e73aec82 1451static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1452{
1da177e4 1453 int retries, res;
e73aec82 1454 struct scsi_device *sdp = sdkp->device;
7e660100
JB		 1455 const int timeout = sdp->request_queue->rq_timeout
1456 * SD_FLUSH_TIMEOUT_MULTIPLIER;
ea73a9f2 1457 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1458
1459 if (!scsi_device_online(sdp))
1460 return -ENODEV;
1461
1da177e4
LT		 1462 for (retries = 3; retries > 0; --retries) {
1463 unsigned char cmd[10] = { 0 };
1464
1465 cmd[0] = SYNCHRONIZE_CACHE;
1466 /*
1467 * Leave the rest of the command zero to indicate
1468 * flush everything.
1469 */
9b21493c 1470 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
7e660100
JB		 1471 &sshdr, timeout, SD_MAX_RETRIES,
1472 NULL, REQ_PM);
ea73a9f2 1473 if (res == 0)
1da177e4
LT		 1474 break;
1475 }
1476
e73aec82 1477 if (res) {
ef61329d 1478 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
95897910 1479
e73aec82
MP		 1480 if (driver_byte(res) & DRIVER_SENSE)
1481 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 1482 /* we need to evaluate the error return */
1483 if (scsi_sense_valid(&sshdr) &&
7aae5134
AS		 1484 (sshdr.asc == 0x3a || /* medium not present */
1485 sshdr.asc == 0x20)) /* invalid command */
95897910
ON		 1486 /* this is no error here */
1487 return 0;
1488
1489 switch (host_byte(res)) {
1490 /* ignore errors due to racing a disconnection */
1491 case DID_BAD_TARGET:
1492 case DID_NO_CONNECT:
1493 return 0;
1494 /* signal the upper layer it might try again */
1495 case DID_BUS_BUSY:
1496 case DID_IMM_RETRY:
1497 case DID_REQUEUE:
1498 case DID_SOFT_ERROR:
1499 return -EBUSY;
1500 default:
1501 return -EIO;
1502 }
1da177e4 1503 }
3721050a 1504 return 0;
1da177e4
LT		 1505}
1506
1da177e4
LT		 1507static void sd_rescan(struct device *dev)
1508{
3d9a1f53 1509 struct scsi_disk *sdkp = dev_get_drvdata(dev);
39b7f1e2 1510
3d9a1f53 1511 revalidate_disk(sdkp->disk);
1da177e4
LT		 1512}
1513
1514
1515#ifdef CONFIG_COMPAT
1516/*
1517 * This gets directly called from VFS. When the ioctl
1518 * is not recognized we go back to the other translation paths.
1519 */
0338e291
AV		 1520static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1521 unsigned int cmd, unsigned long arg)
1da177e4 1522{
0338e291 1523 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
21a9d4c9 1524 int error;
1da177e4 1525
21a9d4c9
CH		 1526 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1527 (mode & FMODE_NDELAY) != 0);
1528 if (error)
1529 return error;
1da177e4 1530
1da177e4
LT		 1531 /*
1532 * Let the static ioctl translation table take care of it.
1533 */
21a9d4c9
CH		 1534 if (!sdev->host->hostt->compat_ioctl)
1535 return -ENOIOCTLCMD;
1536 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1da177e4
LT		 1537}
1538#endif
1539
924d55b0
CH		 1540static char sd_pr_type(enum pr_type type)
1541{
1542 switch (type) {
1543 case PR_WRITE_EXCLUSIVE:
1544 return 0x01;
1545 case PR_EXCLUSIVE_ACCESS:
1546 return 0x03;
1547 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1548 return 0x05;
1549 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1550 return 0x06;
1551 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1552 return 0x07;
1553 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1554 return 0x08;
1555 default:
1556 return 0;
1557 }
1558};
1559
1560static int sd_pr_command(struct block_device *bdev, u8 sa,
1561 u64 key, u64 sa_key, u8 type, u8 flags)
1562{
1563 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1564 struct scsi_sense_hdr sshdr;
1565 int result;
1566 u8 cmd[16] = { 0, };
1567 u8 data[24] = { 0, };
1568
1569 cmd[0] = PERSISTENT_RESERVE_OUT;
1570 cmd[1] = sa;
1571 cmd[2] = type;
1572 put_unaligned_be32(sizeof(data), &cmd[5]);
1573
1574 put_unaligned_be64(key, &data[0]);
1575 put_unaligned_be64(sa_key, &data[8]);
1576 data[20] = flags;
1577
1578 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1579 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1580
1581 if ((driver_byte(result) & DRIVER_SENSE) &&
1582 (scsi_sense_valid(&sshdr))) {
1583 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1584 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1585 }
1586
1587 return result;
1588}
1589
1590static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1591 u32 flags)
1592{
1593 if (flags & ~PR_FL_IGNORE_KEY)
1594 return -EOPNOTSUPP;
1595 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1596 old_key, new_key, 0,
1597 (1 << 0) /* APTPL */ |
1598 (1 << 2) /* ALL_TG_PT */);
1599}
1600
1601static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1602 u32 flags)
1603{
1604 if (flags)
1605 return -EOPNOTSUPP;
1606 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1607}
1608
1609static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1610{
1611 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1612}
1613
1614static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1615 enum pr_type type, bool abort)
1616{
1617 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1618 sd_pr_type(type), 0);
1619}
1620
1621static int sd_pr_clear(struct block_device *bdev, u64 key)
1622{
1623 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1624}
1625
1626static const struct pr_ops sd_pr_ops = {
1627 .pr_register = sd_pr_register,
1628 .pr_reserve = sd_pr_reserve,
1629 .pr_release = sd_pr_release,
1630 .pr_preempt = sd_pr_preempt,
1631 .pr_clear = sd_pr_clear,
1632};
1633
83d5cde4 1634static const struct block_device_operations sd_fops = {
1da177e4 1635 .owner = THIS_MODULE,
0338e291
AV		 1636 .open = sd_open,
1637 .release = sd_release,
8a6cfeb6 1638 .ioctl = sd_ioctl,
a885c8c4 1639 .getgeo = sd_getgeo,
1da177e4 1640#ifdef CONFIG_COMPAT
0338e291 1641 .compat_ioctl = sd_compat_ioctl,
1da177e4 1642#endif
2bae0093 1643 .check_events = sd_check_events,
1da177e4 1644 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1645 .unlock_native_capacity = sd_unlock_native_capacity,
924d55b0 1646 .pr_ops = &sd_pr_ops,
1da177e4
LT		 1647};
1648
18a4d0a2
MP		 1649/**
1650 * sd_eh_action - error handling callback
1651 * @scmd: sd-issued command that has failed
18a4d0a2
MP		 1652 * @eh_disp: The recovery disposition suggested by the midlayer
1653 *
2451079b
JB		 1654 * This function is called by the SCSI midlayer upon completion of an
1655 * error test command (currently TEST UNIT READY). The result of sending
1656 * the eh command is passed in eh_disp. We're looking for devices that
1657 * fail medium access commands but are OK with non access commands like
1658 * test unit ready (so wrongly see the device as having a successful
1659 * recovery)
18a4d0a2 1660 **/
2451079b 1661static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
18a4d0a2
MP		 1662{
1663 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1664
1665 if (!scsi_device_online(scmd->device) ||
2451079b
JB		 1666 !scsi_medium_access_command(scmd) ||
1667 host_byte(scmd->result) != DID_TIME_OUT ||
1668 eh_disp != SUCCESS)
18a4d0a2
MP		 1669 return eh_disp;
1670
1671 /*
1672 * The device has timed out executing a medium access command.
1673 * However, the TEST UNIT READY command sent during error
1674 * handling completed successfully. Either the device is in the
1675 * process of recovering or has it suffered an internal failure
1676 * that prevents access to the storage medium.
1677 */
2451079b 1678 sdkp->medium_access_timed_out++;
18a4d0a2
MP		 1679
1680 /*
1681 * If the device keeps failing read/write commands but TEST UNIT
1682 * READY always completes successfully we assume that medium
1683 * access is no longer possible and take the device offline.
1684 */
1685 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1686 scmd_printk(KERN_ERR, scmd,
1687 "Medium access timeout failure. Offlining disk!\n");
1688 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1689
1690 return FAILED;
1691 }
1692
1693 return eh_disp;
1694}
1695
af55ff67
MP		 1696static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1697{
83096ebf
TH		 1698 u64 start_lba = blk_rq_pos(scmd->request);
1699 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
74856fbf 1700 u64 factor = scmd->device->sector_size / 512;
af55ff67
MP		 1701 u64 bad_lba;
1702 int info_valid;
a8733c7b
JB		 1703 /*
1704 * resid is optional but mostly filled in. When it's unused,
1705 * its value is zero, so we assume the whole buffer transferred
1706 */
1707 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1708 unsigned int good_bytes;
af55ff67 1709
33659ebb 1710 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1711 return 0;
1712
1713 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1714 SCSI_SENSE_BUFFERSIZE,
1715 &bad_lba);
1716 if (!info_valid)
1717 return 0;
1718
1719 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1720 return 0;
1721
74856fbf
MH		 1722 /* be careful ... don't want any overflows */
1723 do_div(start_lba, factor);
1724 do_div(end_lba, factor);
af55ff67
MP		 1725
1726 /* The bad lba was reported incorrectly, we have no idea where
1727 * the error is.
1728 */
1729 if (bad_lba < start_lba || bad_lba >= end_lba)
1730 return 0;
1731
1732 /* This computation should always be done in terms of
1733 * the resolution of the device's medium.
1734 */
a8733c7b
JB		 1735 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1736 return min(good_bytes, transferred);
af55ff67
MP		 1737}
1738
1da177e4 1739/**
7b3d9545 1740 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1741 * driver has completed (successfully or otherwise) a scsi command.
1742 * @SCpnt: mid-level's per command structure.
1743 *
1744 * Note: potentially run from within an ISR. Must not block.
1745 **/
7b3d9545 1746static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1747{
1748 int result = SCpnt->result;
af55ff67 1749 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1750 struct scsi_sense_hdr sshdr;
4e7392ec 1751 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1752 struct request *req = SCpnt->request;
1da177e4
LT		 1753 int sense_valid = 0;
1754 int sense_deferred = 0;
c98a0eb0 1755 unsigned char op = SCpnt->cmnd[0];
5db44863 1756 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1757
5db44863 1758 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1759 if (!result) {
1760 good_bytes = blk_rq_bytes(req);
1761 scsi_set_resid(SCpnt, 0);
1762 } else {
1763 good_bytes = 0;
1764 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1765 }
1766 }
6a32a8ae 1767
1da177e4
LT		 1768 if (result) {
1769 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1770 if (sense_valid)
1771 sense_deferred = scsi_sense_is_deferred(&sshdr);
1772 }
2a863ba8
DJ		 1773 sdkp->medium_access_timed_out = 0;
1774
03aba2f7
LT		 1775 if (driver_byte(result) != DRIVER_SENSE &&
1776 (!sense_valid || sense_deferred))
1777 goto out;
1778
1779 switch (sshdr.sense_key) {
1780 case HARDWARE_ERROR:
1781 case MEDIUM_ERROR:
af55ff67 1782 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1783 break;
1784 case RECOVERED_ERROR:
af55ff67
MP		 1785 good_bytes = scsi_bufflen(SCpnt);
1786 break;
10dab226
JW		 1787 case NO_SENSE:
1788 /* This indicates a false check condition, so ignore it. An
1789 * unknown amount of data was transferred so treat it as an
1790 * error.
1791 */
10dab226
JW		 1792 SCpnt->result = 0;
1793 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1794 break;
c98a0eb0
MP		 1795 case ABORTED_COMMAND:
1796 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1797 good_bytes = sd_completed_bytes(SCpnt);
1798 break;
1799 case ILLEGAL_REQUEST:
1800 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1801 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1802 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1803 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1804 switch (op) {
1805 case UNMAP:
1806 sd_config_discard(sdkp, SD_LBP_DISABLE);
1807 break;
1808 case WRITE_SAME_16:
1809 case WRITE_SAME:
1810 if (unmap)
1811 sd_config_discard(sdkp, SD_LBP_DISABLE);
1812 else {
1813 sdkp->device->no_write_same = 1;
1814 sd_config_write_same(sdkp);
1815
1816 good_bytes = 0;
1817 req->__data_len = blk_rq_bytes(req);
1818 req->cmd_flags |= REQ_QUIET;
1819 }
1820 }
1821 }
03aba2f7
LT		 1822 break;
1823 default:
1824 break;
1da177e4 1825 }
03aba2f7 1826 out:
ef61329d
HR		 1827 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1828 "sd_done: completed %d of %d bytes\n",
1829 good_bytes, scsi_bufflen(SCpnt)));
1830
af55ff67
MP		 1831 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1832 sd_dif_complete(SCpnt, good_bytes);
1833
7b3d9545 1834 return good_bytes;
1da177e4
LT		 1835}
1836
1da177e4
LT		 1837/*
1838 * spinup disk - called only in sd_revalidate_disk()
1839 */
1840static void
e73aec82 1841sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1842{
1da177e4 1843 unsigned char cmd[10];
4451e472 1844 unsigned long spintime_expire = 0;
1da177e4
LT		 1845 int retries, spintime;
1846 unsigned int the_result;
1847 struct scsi_sense_hdr sshdr;
1848 int sense_valid = 0;
1849
1850 spintime = 0;
1851
1852 /* Spin up drives, as required. Only do this at boot time */
1853 /* Spinup needs to be done for module loads too. */
1854 do {
1855 retries = 0;
1856
1857 do {
1858 cmd[0] = TEST_UNIT_READY;
1859 memset((void *) &cmd[1], 0, 9);
1860
ea73a9f2
JB		 1861 the_result = scsi_execute_req(sdkp->device, cmd,
1862 DMA_NONE, NULL, 0,
1863 &sshdr, SD_TIMEOUT,
f4f4e47e 1864 SD_MAX_RETRIES, NULL);
1da177e4 1865
b4d38e38
AS		 1866 /*
1867 * If the drive has indicated to us that it
1868 * doesn't have any media in it, don't bother
1869 * with any more polling.
1870 */
1871 if (media_not_present(sdkp, &sshdr))
1872 return;
1873
1da177e4 1874 if (the_result)
ea73a9f2 1875 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1876 retries++;
1877 } while (retries < 3 &&
1878 (!scsi_status_is_good(the_result) ||
1879 ((driver_byte(the_result) & DRIVER_SENSE) &&
1880 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1881
1da177e4
LT		 1882 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1883 /* no sense, TUR either succeeded or failed
1884 * with a status error */
e73aec82 1885 if(!spintime && !scsi_status_is_good(the_result)) {
ef61329d
HR		 1886 sd_print_result(sdkp, "Test Unit Ready failed",
1887 the_result);
e73aec82 1888 }
1da177e4
LT		 1889 break;
1890 }
ef61329d 1891
1da177e4
LT		 1892 /*
1893 * The device does not want the automatic start to be issued.
1894 */
33dd6f92 1895 if (sdkp->device->no_start_on_add)
1da177e4 1896 break;
1da177e4 1897
33dd6f92
MW		 1898 if (sense_valid && sshdr.sense_key == NOT_READY) {
1899 if (sshdr.asc == 4 && sshdr.ascq == 3)
1900 break; /* manual intervention required */
1901 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1902 break; /* standby */
1903 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1904 break; /* unavailable */
1905 /*
1906 * Issue command to spin up drive when not ready
1907 */
1da177e4 1908 if (!spintime) {
e73aec82 1909 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1910 cmd[0] = START_STOP;
1911 cmd[1] = 1; /* Return immediately */
1912 memset((void *) &cmd[2], 0, 8);
1913 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1914 if (sdkp->device->start_stop_pwr_cond)
1915 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1916 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1917 NULL, 0, &sshdr,
f4f4e47e
FT		 1918 SD_TIMEOUT, SD_MAX_RETRIES,
1919 NULL);
4451e472
AS		 1920 spintime_expire = jiffies + 100 * HZ;
1921 spintime = 1;
1da177e4 1922 }
1da177e4
LT		 1923 /* Wait 1 second for next try */
1924 msleep(1000);
1925 printk(".");
4451e472
AS		 1926
1927 /*
1928 * Wait for USB flash devices with slow firmware.
1929 * Yes, this sense key/ASC combination shouldn't
1930 * occur here. It's characteristic of these devices.
1931 */
1932 } else if (sense_valid &&
1933 sshdr.sense_key == UNIT_ATTENTION &&
1934 sshdr.asc == 0x28) {
1935 if (!spintime) {
1936 spintime_expire = jiffies + 5 * HZ;
1937 spintime = 1;
1938 }
1939 /* Wait 1 second for next try */
1940 msleep(1000);
1da177e4
LT		 1941 } else {
1942 /* we don't understand the sense code, so it's
1943 * probably pointless to loop */
1944 if(!spintime) {
e73aec82
MP		 1945 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1946 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1947 }
1948 break;
1949 }
1950
4451e472 1951 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1952
1953 if (spintime) {
1954 if (scsi_status_is_good(the_result))
1955 printk("ready\n");
1956 else
1957 printk("not responding...\n");
1958 }
1959}
1960
e0597d70
MP		 1961
1962/*
1963 * Determine whether disk supports Data Integrity Field.
1964 */
fe542396 1965static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1966{
1967 struct scsi_device *sdp = sdkp->device;
1968 u8 type;
fe542396 1969 int ret = 0;
e0597d70
MP		 1970
1971 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1972 return ret;
35e1a5d9
MP		 1973
1974 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1975
fe542396
MP		 1976 if (type > SD_DIF_TYPE3_PROTECTION)
1977 ret = -ENODEV;
1978 else if (scsi_host_dif_capable(sdp->host, type))
1979 ret = 1;
1980
1981 if (sdkp->first_scan || type != sdkp->protection_type)
1982 switch (ret) {
1983 case -ENODEV:
1984 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1985 " protection type %u. Disabling disk!\n",
1986 type);
1987 break;
1988 case 1:
1989 sd_printk(KERN_NOTICE, sdkp,
1990 "Enabling DIF Type %u protection\n", type);
1991 break;
1992 case 0:
1993 sd_printk(KERN_NOTICE, sdkp,
1994 "Disabling DIF Type %u protection\n", type);
1995 break;
1996 }
e0597d70 1997
be922f47
MP		 1998 sdkp->protection_type = type;
1999
fe542396 2000 return ret;
e0597d70
MP		 2001}
2002
0da205e0
MW		 2003static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2004 struct scsi_sense_hdr *sshdr, int sense_valid,
2005 int the_result)
2006{
0da205e0
MW		 2007 if (driver_byte(the_result) & DRIVER_SENSE)
2008 sd_print_sense_hdr(sdkp, sshdr);
2009 else
2010 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2011
2012 /*
2013 * Set dirty bit for removable devices if not ready -
2014 * sometimes drives will not report this properly.
2015 */
2016 if (sdp->removable &&
2017 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 2018 set_media_not_present(sdkp);
0da205e0
MW		 2019
2020 /*
2021 * We used to set media_present to 0 here to indicate no media
2022 * in the drive, but some drives fail read capacity even with
2023 * media present, so we can't do that.
2024 */
2025 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2026}
2027
2028#define RC16_LEN 32
2029#if RC16_LEN > SD_BUF_SIZE
2030#error RC16_LEN must not be more than SD_BUF_SIZE
2031#endif
2032
3233ac19
JB		 2033#define READ_CAPACITY_RETRIES_ON_RESET 10
2034
0da205e0
MW		 2035static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2036 unsigned char *buffer)
ea73a9f2 2037{
1da177e4 2038 unsigned char cmd[16];
1da177e4
LT		 2039 struct scsi_sense_hdr sshdr;
2040 int sense_valid = 0;
0da205e0 2041 int the_result;
3233ac19 2042 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 2043 unsigned int alignment;
0da205e0
MW		 2044 unsigned long long lba;
2045 unsigned sector_size;
1da177e4 2046
5ce524bd
HG		 2047 if (sdp->no_read_capacity_16)
2048 return -EINVAL;
2049
1da177e4 2050 do {
0da205e0 2051 memset(cmd, 0, 16);
eb846d9f 2052 cmd[0] = SERVICE_ACTION_IN_16;
0da205e0
MW		 2053 cmd[1] = SAI_READ_CAPACITY_16;
2054 cmd[13] = RC16_LEN;
2055 memset(buffer, 0, RC16_LEN);
2056
ea73a9f2 2057 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 2058 buffer, RC16_LEN, &sshdr,
2059 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 2060
ea73a9f2 2061 if (media_not_present(sdkp, &sshdr))
0da205e0 2062 return -ENODEV;
1da177e4 2063
2b301307 2064 if (the_result) {
ea73a9f2 2065 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 2066 if (sense_valid &&
2067 sshdr.sense_key == ILLEGAL_REQUEST &&
2068 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2069 sshdr.ascq == 0x00)
2070 /* Invalid Command Operation Code or
2071 * Invalid Field in CDB, just retry
2072 * silently with RC10 */
2073 return -EINVAL;
3233ac19
JB		 2074 if (sense_valid &&
2075 sshdr.sense_key == UNIT_ATTENTION &&
2076 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2077 /* Device reset might occur several times,
2078 * give it one more chance */
2079 if (--reset_retries > 0)
2080 continue;
2b301307 2081 }
1da177e4
LT		 2082 retries--;
2083
2084 } while (the_result && retries);
2085
0da205e0 2086 if (the_result) {
ef61329d 2087 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
0da205e0
MW		 2088 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2089 return -EINVAL;
2090 }
e73aec82 2091
8f76d151
DH		 2092 sector_size = get_unaligned_be32(&buffer[8]);
2093 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2094
fe542396
MP		 2095 if (sd_read_protection_type(sdkp, buffer) < 0) {
2096 sdkp->capacity = 0;
2097 return -ENODEV;
2098 }
0da205e0
MW		 2099
2100 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2101 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2102 "kernel compiled with support for large block "
2103 "devices.\n");
2104 sdkp->capacity = 0;
2105 return -EOVERFLOW;
2106 }
2107
ea09bcc9 2108 /* Logical blocks per physical block exponent */
526f7c79 2109 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 2110
2111 /* Lowest aligned logical block */
2112 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2113 blk_queue_alignment_offset(sdp->request_queue, alignment);
2114 if (alignment && sdkp->first_scan)
2115 sd_printk(KERN_NOTICE, sdkp,
2116 "physical block alignment offset: %u\n", alignment);
2117
c98a0eb0
MP		 2118 if (buffer[14] & 0x80) { /* LBPME */
2119 sdkp->lbpme = 1;
e339c1a7 2120
c98a0eb0
MP		 2121 if (buffer[14] & 0x40) /* LBPRZ */
2122 sdkp->lbprz = 1;
e339c1a7 2123
c98a0eb0 2124 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2125 }
2126
0da205e0
MW		 2127 sdkp->capacity = lba + 1;
2128 return sector_size;
2129}
2130
2131static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2132 unsigned char *buffer)
2133{
2134 unsigned char cmd[16];
2135 struct scsi_sense_hdr sshdr;
2136 int sense_valid = 0;
2137 int the_result;
3233ac19 2138 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2139 sector_t lba;
2140 unsigned sector_size;
2141
2142 do {
2143 cmd[0] = READ_CAPACITY;
2144 memset(&cmd[1], 0, 9);
2145 memset(buffer, 0, 8);
2146
2147 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2148 buffer, 8, &sshdr,
2149 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2150
2151 if (media_not_present(sdkp, &sshdr))
2152 return -ENODEV;
2153
3233ac19 2154 if (the_result) {
0da205e0 2155 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2156 if (sense_valid &&
2157 sshdr.sense_key == UNIT_ATTENTION &&
2158 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2159 /* Device reset might occur several times,
2160 * give it one more chance */
2161 if (--reset_retries > 0)
2162 continue;
2163 }
0da205e0
MW		 2164 retries--;
2165
2166 } while (the_result && retries);
2167
2168 if (the_result) {
ef61329d 2169 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
0da205e0
MW		 2170 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2171 return -EINVAL;
2172 }
2173
8f76d151
DH		 2174 sector_size = get_unaligned_be32(&buffer[4]);
2175 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2176
5ce524bd
HG		 2177 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2178 /* Some buggy (usb cardreader) devices return an lba of
2179 0xffffffff when the want to report a size of 0 (with
2180 which they really mean no media is present) */
2181 sdkp->capacity = 0;
5cc10350 2182 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2183 return sector_size;
2184 }
2185
0da205e0
MW		 2186 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2187 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2188 "kernel compiled with support for large block "
2189 "devices.\n");
2190 sdkp->capacity = 0;
2191 return -EOVERFLOW;
2192 }
2193
2194 sdkp->capacity = lba + 1;
526f7c79 2195 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2196 return sector_size;
2197}
2198
2b301307
MW		 2199static int sd_try_rc16_first(struct scsi_device *sdp)
2200{
f87146bb
HR		 2201 if (sdp->host->max_cmd_len < 16)
2202 return 0;
6a0bdffa
AS		 2203 if (sdp->try_rc_10_first)
2204 return 0;
2b301307
MW		 2205 if (sdp->scsi_level > SCSI_SPC_2)
2206 return 1;
2207 if (scsi_device_protection(sdp))
2208 return 1;
2209 return 0;
2210}
2211
0da205e0
MW		 2212/*
2213 * read disk capacity
2214 */
2215static void
2216sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2217{
2218 int sector_size;
2219 struct scsi_device *sdp = sdkp->device;
70a9b873 2220 sector_t old_capacity = sdkp->capacity;
0da205e0 2221
2b301307 2222 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2223 sector_size = read_capacity_16(sdkp, sdp, buffer);
2224 if (sector_size == -EOVERFLOW)
1da177e4 2225 goto got_data;
2b301307
MW		 2226 if (sector_size == -ENODEV)
2227 return;
2228 if (sector_size < 0)
2229 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2230 if (sector_size < 0)
2231 return;
1da177e4 2232 } else {
0da205e0
MW		 2233 sector_size = read_capacity_10(sdkp, sdp, buffer);
2234 if (sector_size == -EOVERFLOW)
2235 goto got_data;
2236 if (sector_size < 0)
2237 return;
2238 if ((sizeof(sdkp->capacity) > 4) &&
2239 (sdkp->capacity > 0xffffffffULL)) {
2240 int old_sector_size = sector_size;
2241 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2242 "Trying to use READ CAPACITY(16).\n");
2243 sector_size = read_capacity_16(sdkp, sdp, buffer);
2244 if (sector_size < 0) {
2245 sd_printk(KERN_NOTICE, sdkp,
2246 "Using 0xffffffff as device size\n");
2247 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2248 sector_size = old_sector_size;
2249 goto got_data;
2250 }
2251 }
2252 }
1da177e4 2253
5c211caa
AS		 2254 /* Some devices are known to return the total number of blocks,
2255 * not the highest block number. Some devices have versions
2256 * which do this and others which do not. Some devices we might
2257 * suspect of doing this but we don't know for certain.
2258 *
2259 * If we know the reported capacity is wrong, decrement it. If
2260 * we can only guess, then assume the number of blocks is even
2261 * (usually true but not always) and err on the side of lowering
2262 * the capacity.
2263 */
2264 if (sdp->fix_capacity ||
2265 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2266 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2267 "from its reported value: %llu\n",
2268 (unsigned long long) sdkp->capacity);
1da177e4 2269 --sdkp->capacity;
61bf54b7
ON		 2270 }
2271
1da177e4
LT		 2272got_data:
2273 if (sector_size == 0) {
2274 sector_size = 512;
e73aec82
MP		 2275 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2276 "assuming 512.\n");
1da177e4
LT		 2277 }
2278
2279 if (sector_size != 512 &&
2280 sector_size != 1024 &&
2281 sector_size != 2048 &&
74856fbf 2282 sector_size != 4096) {
e73aec82
MP		 2283 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2284 sector_size);
1da177e4
LT		 2285 /*
2286 * The user might want to re-format the drive with
2287 * a supported sectorsize. Once this happens, it
2288 * would be relatively trivial to set the thing up.
2289 * For this reason, we leave the thing in the table.
2290 */
2291 sdkp->capacity = 0;
2292 /*
2293 * set a bogus sector size so the normal read/write
2294 * logic in the block layer will eventually refuse any
2295 * request on this device without tripping over power
2296 * of two sector size assumptions
2297 */
2298 sector_size = 512;
2299 }
e1defc4f 2300 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2301
1da177e4 2302 {
7404ad3b 2303 char cap_str_2[10], cap_str_10[10];
1da177e4 2304
b9f28d86
JB		 2305 string_get_size(sdkp->capacity, sector_size,
2306 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2307 string_get_size(sdkp->capacity, sector_size,
2308 STRING_UNITS_10, cap_str_10,
7404ad3b 2309 sizeof(cap_str_10));
1da177e4 2310
ea09bcc9 2311 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2312 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2313 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2314 (unsigned long long)sdkp->capacity,
2315 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2316
526f7c79 2317 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2318 sd_printk(KERN_NOTICE, sdkp,
2319 "%u-byte physical blocks\n",
526f7c79 2320 sdkp->physical_block_size);
ea09bcc9 2321 }
1da177e4
LT		 2322 }
2323
bcdb247c
MP		 2324 if (sdkp->capacity > 0xffffffff) {
2325 sdp->use_16_for_rw = 1;
2326 sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS;
2327 } else
2328 sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS;
53ad570b 2329
1da177e4
LT		 2330 /* Rescale capacity to 512-byte units */
2331 if (sector_size == 4096)
2332 sdkp->capacity <<= 3;
2333 else if (sector_size == 2048)
2334 sdkp->capacity <<= 2;
2335 else if (sector_size == 1024)
2336 sdkp->capacity <<= 1;
1da177e4 2337
526f7c79
MP		 2338 blk_queue_physical_block_size(sdp->request_queue,
2339 sdkp->physical_block_size);
1da177e4
LT		 2340 sdkp->device->sector_size = sector_size;
2341}
2342
2343/* called with buffer of length 512 */
2344static inline int
ea73a9f2
JB		 2345sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2346 unsigned char *buffer, int len, struct scsi_mode_data *data,
2347 struct scsi_sense_hdr *sshdr)
1da177e4 2348{
ea73a9f2 2349 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2350 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2351 sshdr);
1da177e4
LT		 2352}
2353
2354/*
2355 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2356 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2357 */
2358static void
e73aec82 2359sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2360{
1da177e4 2361 int res;
ea73a9f2 2362 struct scsi_device *sdp = sdkp->device;
1da177e4 2363 struct scsi_mode_data data;
70a9b873 2364 int old_wp = sdkp->write_prot;
1da177e4
LT		 2365
2366 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2367 if (sdp->skip_ms_page_3f) {
b2bff6ce 2368 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2369 return;
2370 }
2371
ea73a9f2
JB		 2372 if (sdp->use_192_bytes_for_3f) {
2373 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2374 } else {
2375 /*
2376 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2377 * We have to start carefully: some devices hang if we ask
2378 * for more than is available.
2379 */
ea73a9f2 2380 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2381
2382 /*
2383 * Second attempt: ask for page 0 When only page 0 is
2384 * implemented, a request for page 3F may return Sense Key
2385 * 5: Illegal Request, Sense Code 24: Invalid field in
2386 * CDB.
2387 */
2388 if (!scsi_status_is_good(res))
ea73a9f2 2389 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2390
2391 /*
2392 * Third attempt: ask 255 bytes, as we did earlier.
2393 */
2394 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2395 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2396 &data, NULL);
1da177e4
LT		 2397 }
2398
2399 if (!scsi_status_is_good(res)) {
b2bff6ce 2400 sd_first_printk(KERN_WARNING, sdkp,
e73aec82 2401 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2402 } else {
2403 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2404 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2405 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2406 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2407 sdkp->write_prot ? "on" : "off");
2408 sd_printk(KERN_DEBUG, sdkp,
2409 "Mode Sense: %02x %02x %02x %02x\n",
2410 buffer[0], buffer[1], buffer[2], buffer[3]);
2411 }
1da177e4
LT		 2412 }
2413}
2414
2415/*
2416 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2417 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2418 */
2419static void
e73aec82 2420sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2421{
1da177e4 2422 int len = 0, res;
ea73a9f2 2423 struct scsi_device *sdp = sdkp->device;
1da177e4 2424
631e8a13
AV		 2425 int dbd;
2426 int modepage;
0bcaa111 2427 int first_len;
1da177e4
LT		 2428 struct scsi_mode_data data;
2429 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2430 int old_wce = sdkp->WCE;
2431 int old_rcd = sdkp->RCD;
2432 int old_dpofua = sdkp->DPOFUA;
1da177e4 2433
39c60a09
JB		 2434
2435 if (sdkp->cache_override)
2436 return;
2437
0bcaa111
LT		 2438 first_len = 4;
2439 if (sdp->skip_ms_page_8) {
2440 if (sdp->type == TYPE_RBC)
2441 goto defaults;
2442 else {
2443 if (sdp->skip_ms_page_3f)
2444 goto defaults;
2445 modepage = 0x3F;
2446 if (sdp->use_192_bytes_for_3f)
2447 first_len = 192;
2448 dbd = 0;
2449 }
2450 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2451 modepage = 6;
2452 dbd = 8;
2453 } else {
2454 modepage = 8;
2455 dbd = 0;
2456 }
2457
1da177e4 2458 /* cautiously ask */
0bcaa111
LT		 2459 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2460 &data, &sshdr);
1da177e4
LT		 2461
2462 if (!scsi_status_is_good(res))
2463 goto bad_sense;
2464
6d73c851
AV		 2465 if (!data.header_length) {
2466 modepage = 6;
0bcaa111 2467 first_len = 0;
b2bff6ce
MP		 2468 sd_first_printk(KERN_ERR, sdkp,
2469 "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2470 }
2471
1da177e4
LT		 2472 /* that went OK, now ask for the proper length */
2473 len = data.length;
2474
2475 /*
2476 * We're only interested in the first three bytes, actually.
2477 * But the data cache page is defined for the first 20.
2478 */
2479 if (len < 3)
2480 goto bad_sense;
0bcaa111 2481 else if (len > SD_BUF_SIZE) {
b2bff6ce 2482 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
0bcaa111
LT		 2483 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2484 len = SD_BUF_SIZE;
2485 }
2486 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2487 len = 192;
1da177e4
LT		 2488
2489 /* Get the data */
0bcaa111
LT		 2490 if (len > first_len)
2491 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2492 &data, &sshdr);
1da177e4
LT		 2493
2494 if (scsi_status_is_good(res)) {
631e8a13 2495 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2496
0bcaa111
LT		 2497 while (offset < len) {
2498 u8 page_code = buffer[offset] & 0x3F;
2499 u8 spf = buffer[offset] & 0x40;
2500
2501 if (page_code == 8 || page_code == 6) {
2502 /* We're interested only in the first 3 bytes.
2503 */
2504 if (len - offset <= 2) {
b2bff6ce
MP		 2505 sd_first_printk(KERN_ERR, sdkp,
2506 "Incomplete mode parameter "
2507 "data\n");
0bcaa111
LT		 2508 goto defaults;
2509 } else {
2510 modepage = page_code;
2511 goto Page_found;
2512 }
2513 } else {
2514 /* Go to the next page */
2515 if (spf && len - offset > 3)
2516 offset += 4 + (buffer[offset+2] << 8) +
2517 buffer[offset+3];
2518 else if (!spf && len - offset > 1)
2519 offset += 2 + buffer[offset+1];
2520 else {
b2bff6ce
MP		 2521 sd_first_printk(KERN_ERR, sdkp,
2522 "Incomplete mode "
2523 "parameter data\n");
0bcaa111
LT		 2524 goto defaults;
2525 }
2526 }
48970800
AV		 2527 }
2528
b2bff6ce 2529 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
984f1733
AS		 2530 goto defaults;
2531
0bcaa111 2532 Page_found:
631e8a13
AV		 2533 if (modepage == 8) {
2534 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2535 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2536 } else {
2537 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2538 sdkp->RCD = 0;
2539 }
1da177e4 2540
007365ad 2541 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
b14bf2d0
AS		 2542 if (sdp->broken_fua) {
2543 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2544 sdkp->DPOFUA = 0;
2545 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
b2bff6ce 2546 sd_first_printk(KERN_NOTICE, sdkp,
e73aec82 2547 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2548 sdkp->DPOFUA = 0;
2549 }
2550
2eefd57b
SRT		 2551 /* No cache flush allowed for write protected devices */
2552 if (sdkp->WCE && sdkp->write_prot)
2553 sdkp->WCE = 0;
2554
70a9b873
MP		 2555 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2556 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2557 sd_printk(KERN_NOTICE, sdkp,
2558 "Write cache: %s, read cache: %s, %s\n",
2559 sdkp->WCE ? "enabled" : "disabled",
2560 sdkp->RCD ? "disabled" : "enabled",
2561 sdkp->DPOFUA ? "supports DPO and FUA"
2562 : "doesn't support DPO or FUA");
1da177e4
LT		 2563
2564 return;
2565 }
2566
2567bad_sense:
ea73a9f2 2568 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2569 sshdr.sense_key == ILLEGAL_REQUEST &&
2570 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82 2571 /* Invalid field in CDB */
b2bff6ce 2572 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2573 else
b2bff6ce
MP		 2574 sd_first_printk(KERN_ERR, sdkp,
2575 "Asking for cache data failed\n");
1da177e4
LT		 2576
2577defaults:
b81478d8 2578 if (sdp->wce_default_on) {
b2bff6ce
MP		 2579 sd_first_printk(KERN_NOTICE, sdkp,
2580 "Assuming drive cache: write back\n");
b81478d8
NJ		 2581 sdkp->WCE = 1;
2582 } else {
b2bff6ce
MP		 2583 sd_first_printk(KERN_ERR, sdkp,
2584 "Assuming drive cache: write through\n");
b81478d8
NJ		 2585 sdkp->WCE = 0;
2586 }
1da177e4 2587 sdkp->RCD = 0;
48970800 2588 sdkp->DPOFUA = 0;
1da177e4
LT		 2589}
2590
e0597d70
MP		 2591/*
2592 * The ATO bit indicates whether the DIF application tag is available
2593 * for use by the operating system.
2594 */
439d77f7 2595static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2596{
2597 int res, offset;
2598 struct scsi_device *sdp = sdkp->device;
2599 struct scsi_mode_data data;
2600 struct scsi_sense_hdr sshdr;
2601
2602 if (sdp->type != TYPE_DISK)
2603 return;
2604
2605 if (sdkp->protection_type == 0)
2606 return;
2607
2608 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2609 SD_MAX_RETRIES, &data, &sshdr);
2610
2611 if (!scsi_status_is_good(res) || !data.header_length ||
2612 data.length < 6) {
b2bff6ce 2613 sd_first_printk(KERN_WARNING, sdkp,
e0597d70
MP		 2614 "getting Control mode page failed, assume no ATO\n");
2615
2616 if (scsi_sense_valid(&sshdr))
2617 sd_print_sense_hdr(sdkp, &sshdr);
2618
2619 return;
2620 }
2621
2622 offset = data.header_length + data.block_descriptor_length;
2623
2624 if ((buffer[offset] & 0x3f) != 0x0a) {
b2bff6ce 2625 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
e0597d70
MP		 2626 return;
2627 }
2628
2629 if ((buffer[offset + 5] & 0x80) == 0)
2630 return;
2631
2632 sdkp->ATO = 1;
2633
2634 return;
2635}
2636
d11b6916
MP		 2637/**
2638 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2639 * @disk: disk to query
2640 */
2641static void sd_read_block_limits(struct scsi_disk *sdkp)
2642{
2643 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2644 const int vpd_len = 64;
bcdb247c 2645 u32 max_xfer_length;
e3deec09 2646 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2647
e3deec09
JB		 2648 if (!buffer ||
2649 /* Block Limits VPD */
2650 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2651 goto out;
d11b6916 2652
bcdb247c
MP		 2653 max_xfer_length = get_unaligned_be32(&buffer[8]);
2654 if (max_xfer_length)
2655 sdkp->max_xfer_blocks = max_xfer_length;
2656
d11b6916
MP		 2657 blk_queue_io_min(sdkp->disk->queue,
2658 get_unaligned_be16(&buffer[6]) * sector_sz);
2659 blk_queue_io_opt(sdkp->disk->queue,
2660 get_unaligned_be32(&buffer[12]) * sector_sz);
2661
c98a0eb0
MP		 2662 if (buffer[3] == 0x3c) {
2663 unsigned int lba_count, desc_count;
e339c1a7 2664
5db44863 2665 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2666
c98a0eb0 2667 if (!sdkp->lbpme)
045d3fe7 2668 goto out;
045d3fe7 2669
c98a0eb0
MP		 2670 lba_count = get_unaligned_be32(&buffer[20]);
2671 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2672
c98a0eb0
MP		 2673 if (lba_count && desc_count)
2674 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2675
c98a0eb0 2676 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2677
2678 if (buffer[32] & 0x80)
c98a0eb0 2679 sdkp->unmap_alignment =
e339c1a7 2680 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2681
2682 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2683
2684 if (sdkp->max_unmap_blocks)
2685 sd_config_discard(sdkp, SD_LBP_UNMAP);
2686 else
2687 sd_config_discard(sdkp, SD_LBP_WS16);
2688
2689 } else { /* LBP VPD page tells us what to use */
e461338b
MP		 2690 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2691 sd_config_discard(sdkp, SD_LBP_UNMAP);
2692 else if (sdkp->lbpws)
c98a0eb0
MP		 2693 sd_config_discard(sdkp, SD_LBP_WS16);
2694 else if (sdkp->lbpws10)
2695 sd_config_discard(sdkp, SD_LBP_WS10);
7985090a
MP		 2696 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2697 sd_config_discard(sdkp, SD_LBP_UNMAP);
c98a0eb0
MP		 2698 else
2699 sd_config_discard(sdkp, SD_LBP_DISABLE);
2700 }
e339c1a7
MP		 2701 }
2702
e3deec09 2703 out:
d11b6916
MP		 2704 kfree(buffer);
2705}
2706
3821d768
MP		 2707/**
2708 * sd_read_block_characteristics - Query block dev. characteristics
2709 * @disk: disk to query
2710 */
2711static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2712{
e3deec09 2713 unsigned char *buffer;
3821d768 2714 u16 rot;
bb2d3de1 2715 const int vpd_len = 64;
3821d768 2716
e3deec09 2717 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2718
e3deec09
JB		 2719 if (!buffer ||
2720 /* Block Device Characteristics VPD */
2721 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2722 goto out;
3821d768
MP		 2723
2724 rot = get_unaligned_be16(&buffer[4]);
2725
b277da0a 2726 if (rot == 1) {
3821d768 2727 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
b277da0a
MS		 2728 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2729 }
3821d768 2730
e3deec09 2731 out:
3821d768
MP		 2732 kfree(buffer);
2733}
2734
045d3fe7 2735/**
c98a0eb0 2736 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2737 * @disk: disk to query
2738 */
c98a0eb0 2739static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2740{
2741 unsigned char *buffer;
2742 const int vpd_len = 8;
2743
c98a0eb0 2744 if (sdkp->lbpme == 0)
045d3fe7
MP		 2745 return;
2746
2747 buffer = kmalloc(vpd_len, GFP_KERNEL);
2748
2749 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2750 goto out;
2751
c98a0eb0
MP		 2752 sdkp->lbpvpd = 1;
2753 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2754 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2755 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2756
2757 out:
2758 kfree(buffer);
2759}
2760
5db44863
MP		 2761static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2762{
66c28f97
MP		 2763 struct scsi_device *sdev = sdkp->device;
2764
54b2b50c
MP		 2765 if (sdev->host->no_write_same) {
2766 sdev->no_write_same = 1;
2767
2768 return;
2769 }
2770
66c28f97 2771 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af73623f
BS		 2772 /* too large values might cause issues with arcmsr */
2773 int vpd_buf_len = 64;
2774
66c28f97
MP		 2775 sdev->no_report_opcodes = 1;
2776
2777 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2778 * CODES is unsupported and the device has an ATA
2779 * Information VPD page (SAT).
2780 */
af73623f 2781 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
66c28f97
MP		 2782 sdev->no_write_same = 1;
2783 }
2784
2785 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2786 sdkp->ws16 = 1;
66c28f97
MP		 2787
2788 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2789 sdkp->ws10 = 1;
5db44863
MP		 2790}
2791
ffd4bc2a
MP		 2792static int sd_try_extended_inquiry(struct scsi_device *sdp)
2793{
c1d40a52
MP		 2794 /* Attempt VPD inquiry if the device blacklist explicitly calls
2795 * for it.
2796 */
2797 if (sdp->try_vpd_pages)
2798 return 1;
ffd4bc2a
MP		 2799 /*
2800 * Although VPD inquiries can go to SCSI-2 type devices,
2801 * some USB ones crash on receiving them, and the pages
2802 * we currently ask for are for SPC-3 and beyond
2803 */
09b6b51b 2804 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2805 return 1;
2806 return 0;
2807}
2808
1da177e4
LT		 2809/**
2810 * sd_revalidate_disk - called the first time a new disk is seen,
2811 * performs disk spin up, read_capacity, etc.
2812 * @disk: struct gendisk we care about
2813 **/
2814static int sd_revalidate_disk(struct gendisk *disk)
2815{
2816 struct scsi_disk *sdkp = scsi_disk(disk);
2817 struct scsi_device *sdp = sdkp->device;
1da177e4 2818 unsigned char *buffer;
bcdb247c 2819 unsigned int max_xfer;
1da177e4 2820
fa0d34be
MP		 2821 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2822 "sd_revalidate_disk\n"));
1da177e4
LT		 2823
2824 /*
2825 * If the device is offline, don't try and read capacity or any
2826 * of the other niceties.
2827 */
2828 if (!scsi_device_online(sdp))
2829 goto out;
2830
a6123f14 2831 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2832 if (!buffer) {
e73aec82
MP		 2833 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2834 "allocation failure.\n");
ea73a9f2 2835 goto out;
1da177e4
LT		 2836 }
2837
e73aec82 2838 sd_spinup_disk(sdkp);
1da177e4
LT		 2839
2840 /*
2841 * Without media there is no reason to ask; moreover, some devices
2842 * react badly if we do.
2843 */
2844 if (sdkp->media_present) {
e73aec82 2845 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2846
2847 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2848 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2849 sd_read_block_limits(sdkp);
2850 sd_read_block_characteristics(sdkp);
2851 }
2852
e73aec82
MP		 2853 sd_read_write_protect_flag(sdkp, buffer);
2854 sd_read_cache_type(sdkp, buffer);
e0597d70 2855 sd_read_app_tag_own(sdkp, buffer);
5db44863 2856 sd_read_write_same(sdkp, buffer);
1da177e4 2857 }
461d4e90 2858
70a9b873
MP		 2859 sdkp->first_scan = 0;
2860
461d4e90
TH		 2861 /*
2862 * We now have all cache related info, determine how we deal
4913efe4 2863 * with flush requests.
461d4e90 2864 */
cb2fb68d 2865 sd_set_flush_flag(sdkp);
461d4e90 2866
3a9794d3 2867 max_xfer = sdkp->max_xfer_blocks;
bcdb247c 2868 max_xfer <<= ilog2(sdp->sector_size) - 9;
3a9794d3 2869
4f258a46
MP		 2870 sdkp->disk->queue->limits.max_sectors =
2871 min_not_zero(queue_max_hw_sectors(sdkp->disk->queue), max_xfer);
2872
1da177e4 2873 set_capacity(disk, sdkp->capacity);
5db44863 2874 sd_config_write_same(sdkp);
1da177e4
LT		 2875 kfree(buffer);
2876
1da177e4
LT		 2877 out:
2878 return 0;
2879}
2880
72ec24bd
TH		 2881/**
2882 * sd_unlock_native_capacity - unlock native capacity
2883 * @disk: struct gendisk to set capacity for
2884 *
2885 * Block layer calls this function if it detects that partitions
2886 * on @disk reach beyond the end of the device. If the SCSI host
2887 * implements ->unlock_native_capacity() method, it's invoked to
2888 * give it a chance to adjust the device capacity.
2889 *
2890 * CONTEXT:
2891 * Defined by block layer. Might sleep.
2892 */
2893static void sd_unlock_native_capacity(struct gendisk *disk)
2894{
2895 struct scsi_device *sdev = scsi_disk(disk)->device;
2896
2897 if (sdev->host->hostt->unlock_native_capacity)
2898 sdev->host->hostt->unlock_native_capacity(sdev);
2899}
2900
3e1a7ff8
TH		 2901/**
2902 * sd_format_disk_name - format disk name
2903 * @prefix: name prefix - ie. "sd" for SCSI disks
2904 * @index: index of the disk to format name for
2905 * @buf: output buffer
2906 * @buflen: length of the output buffer
2907 *
2908 * SCSI disk names starts at sda. The 26th device is sdz and the
2909 * 27th is sdaa. The last one for two lettered suffix is sdzz
2910 * which is followed by sdaaa.
2911 *
2912 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2913 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2914 * determined using similar method as 26 base conversion with the
2915 * index shifted -1 after each digit is computed.
2916 *
2917 * CONTEXT:
2918 * Don't care.
2919 *
2920 * RETURNS:
2921 * 0 on success, -errno on failure.
2922 */
2923static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2924{
2925 const int base = 'z' - 'a' + 1;
2926 char *begin = buf + strlen(prefix);
2927 char *end = buf + buflen;
2928 char *p;
2929 int unit;
2930
2931 p = end - 1;
2932 *p = '\0';
2933 unit = base;
2934 do {
2935 if (p == begin)
2936 return -EINVAL;
2937 *--p = 'a' + (index % unit);
2938 index = (index / unit) - 1;
2939 } while (index >= 0);
2940
2941 memmove(begin, p, end - p);
2942 memcpy(buf, prefix, strlen(prefix));
2943
2944 return 0;
2945}
2946
4ace92fc
AV		 2947/*
2948 * The asynchronous part of sd_probe
2949 */
2950static void sd_probe_async(void *data, async_cookie_t cookie)
2951{
2952 struct scsi_disk *sdkp = data;
2953 struct scsi_device *sdp;
2954 struct gendisk *gd;
2955 u32 index;
2956 struct device *dev;
2957
2958 sdp = sdkp->device;
2959 gd = sdkp->disk;
2960 index = sdkp->index;
2961 dev = &sdp->sdev_gendev;
2962
1a03ae0f
MR		 2963 gd->major = sd_major((index & 0xf0) >> 4);
2964 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2965 gd->minors = SD_MINORS;
2966
4ace92fc
AV		 2967 gd->fops = &sd_fops;
2968 gd->private_data = &sdkp->driver;
2969 gd->queue = sdkp->device->request_queue;
2970
70a9b873
MP		 2971 /* defaults, until the device tells us otherwise */
2972 sdp->sector_size = 512;
2973 sdkp->capacity = 0;
2974 sdkp->media_present = 1;
2975 sdkp->write_prot = 0;
39c60a09 2976 sdkp->cache_override = 0;
70a9b873
MP		 2977 sdkp->WCE = 0;
2978 sdkp->RCD = 0;
2979 sdkp->ATO = 0;
2980 sdkp->first_scan = 1;
18a4d0a2 2981 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2982
4ace92fc
AV		 2983 sd_revalidate_disk(gd);
2984
4ace92fc 2985 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2986 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2987 if (sdp->removable) {
4ace92fc 2988 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2989 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2990 }
4ace92fc 2991
10c580e4 2992 blk_pm_runtime_init(sdp->request_queue, dev);
4ace92fc 2993 add_disk(gd);
fe542396
MP		 2994 if (sdkp->capacity)
2995 sd_dif_config_host(sdkp);
4ace92fc 2996
3821d768
MP		 2997 sd_revalidate_disk(gd);
2998
4ace92fc
AV		 2999 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3000 sdp->removable ? "removable " : "");
478a8a05 3001 scsi_autopm_put_device(sdp);
ea038f63 3002 put_device(&sdkp->dev);
4ace92fc
AV		 3003}
3004
1da177e4
LT		 3005/**
3006 * sd_probe - called during driver initialization and whenever a
3007 * new scsi device is attached to the system. It is called once
3008 * for each scsi device (not just disks) present.
3009 * @dev: pointer to device object
3010 *
3011 * Returns 0 if successful (or not interested in this scsi device
3012 * (e.g. scanner)); 1 when there is an error.
3013 *
3014 * Note: this function is invoked from the scsi mid-level.
3015 * This function sets up the mapping between a given
3016 * <host,channel,id,lun> (found in sdp) and new device name
3017 * (e.g. /dev/sda). More precisely it is the block device major
3018 * and minor number that is chosen here.
3019 *
2db93ce8
PU		 3020 * Assume sd_probe is not re-entrant (for time being)
3021 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 3022 **/
3023static int sd_probe(struct device *dev)
3024{
3025 struct scsi_device *sdp = to_scsi_device(dev);
3026 struct scsi_disk *sdkp;
3027 struct gendisk *gd;
439d77f7 3028 int index;
1da177e4
LT		 3029 int error;
3030
6fe8c1db 3031 scsi_autopm_get_device(sdp);
1da177e4 3032 error = -ENODEV;
631e8a13 3033 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 3034 goto out;
3035
9ccfc756 3036 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 3037 "sd_probe\n"));
1da177e4
LT		 3038
3039 error = -ENOMEM;
24669f75 3040 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 3041 if (!sdkp)
3042 goto out;
3043
689d6fac 3044 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 3045 if (!gd)
3046 goto out_free;
3047
f27bac27
TH		 3048 do {
3049 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3050 goto out_put;
1da177e4 3051
4034cc68 3052 spin_lock(&sd_index_lock);
f27bac27 3053 error = ida_get_new(&sd_index_ida, &index);
4034cc68 3054 spin_unlock(&sd_index_lock);
f27bac27 3055 } while (error == -EAGAIN);
1da177e4 3056
21208ae5
DK		 3057 if (error) {
3058 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 3059 goto out_put;
1a03ae0f
MR		 3060 }
3061
3e1a7ff8 3062 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 3063 if (error) {
3064 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 3065 goto out_free_index;
21208ae5 3066 }
f27bac27 3067
1da177e4
LT		 3068 sdkp->device = sdp;
3069 sdkp->driver = &sd_template;
3070 sdkp->disk = gd;
3071 sdkp->index = index;
409f3499 3072 atomic_set(&sdkp->openers, 0);
9e1a1537 3073 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 3074
601e7638
JB		 3075 if (!sdp->request_queue->rq_timeout) {
3076 if (sdp->type != TYPE_MOD)
3077 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3078 else
3079 blk_queue_rq_timeout(sdp->request_queue,
3080 SD_MOD_TIMEOUT);
3081 }
3082
3083 device_initialize(&sdkp->dev);
478a8a05 3084 sdkp->dev.parent = dev;
601e7638 3085 sdkp->dev.class = &sd_disk_class;
02aa2a37 3086 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
601e7638 3087
dee0586e
DC		 3088 error = device_add(&sdkp->dev);
3089 if (error)
601e7638
JB		 3090 goto out_free_index;
3091
478a8a05
AS		 3092 get_device(dev);
3093 dev_set_drvdata(dev, sdkp);
601e7638 3094
ea038f63 3095 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 3096 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 3097
3098 return 0;
3099
f27bac27 3100 out_free_index:
4034cc68 3101 spin_lock(&sd_index_lock);
f27bac27 3102 ida_remove(&sd_index_ida, index);
4034cc68 3103 spin_unlock(&sd_index_lock);
6bdaa1f1 3104 out_put:
1da177e4 3105 put_disk(gd);
6bdaa1f1 3106 out_free:
1da177e4 3107 kfree(sdkp);
6bdaa1f1 3108 out:
6fe8c1db 3109 scsi_autopm_put_device(sdp);
1da177e4
LT		 3110 return error;
3111}
3112
3113/**
3114 * sd_remove - called whenever a scsi disk (previously recognized by
3115 * sd_probe) is detached from the system. It is called (potentially
3116 * multiple times) during sd module unload.
3117 * @sdp: pointer to mid level scsi device object
3118 *
3119 * Note: this function is invoked from the scsi mid-level.
3120 * This function potentially frees up a device name (e.g. /dev/sdc)
3121 * that could be re-used by a subsequent sd_probe().
3122 * This function is not called when the built-in sd driver is "exit-ed".
3123 **/
3124static int sd_remove(struct device *dev)
3125{
601e7638 3126 struct scsi_disk *sdkp;
0761df9c 3127 dev_t devt;
1da177e4 3128
601e7638 3129 sdkp = dev_get_drvdata(dev);
0761df9c 3130 devt = disk_devt(sdkp->disk);
478a8a05
AS		 3131 scsi_autopm_get_device(sdkp->device);
3132
3c31b52f 3133 async_synchronize_full_domain(&scsi_sd_pm_domain);
a7a20d10 3134 async_synchronize_full_domain(&scsi_sd_probe_domain);
ee959b00 3135 device_del(&sdkp->dev);
1da177e4
LT		 3136 del_gendisk(sdkp->disk);
3137 sd_shutdown(dev);
39b7f1e2 3138
0761df9c
HR		 3139 blk_register_region(devt, SD_MINORS, NULL,
3140 sd_default_probe, NULL, NULL);
3141
0b950672 3142 mutex_lock(&sd_ref_mutex);
39b7f1e2 3143 dev_set_drvdata(dev, NULL);
ee959b00 3144 put_device(&sdkp->dev);
0b950672 3145 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3146
3147 return 0;
3148}
3149
3150/**
3151 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3152 * @dev: pointer to embedded class device
1da177e4 3153 *
0b950672 3154 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3155 * called on last put, you should always use the scsi_disk_get()
3156 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3157 * and never do a direct put_device.
1da177e4 3158 **/
ee959b00 3159static void scsi_disk_release(struct device *dev)
1da177e4 3160{
ee959b00 3161 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3162 struct gendisk *disk = sdkp->disk;
3163
4034cc68 3164 spin_lock(&sd_index_lock);
f27bac27 3165 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 3166 spin_unlock(&sd_index_lock);
1da177e4
LT		 3167
3168 disk->private_data = NULL;
1da177e4 3169 put_disk(disk);
39b7f1e2 3170 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3171
3172 kfree(sdkp);
3173}
3174
cc5d2c8c 3175static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3176{
3177 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3178 struct scsi_sense_hdr sshdr;
cc5d2c8c 3179 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3180 int res;
3181
3182 if (start)
3183 cmd[4] |= 1; /* START */
3184
d2886ea3
SR		 3185 if (sdp->start_stop_pwr_cond)
3186 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3187
c3c94c5a
TH		 3188 if (!scsi_device_online(sdp))
3189 return -ENODEV;
3190
9b21493c
LM		 3191 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3192 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
c3c94c5a 3193 if (res) {
ef61329d 3194 sd_print_result(sdkp, "Start/Stop Unit failed", res);
c3c94c5a 3195 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3196 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 3197 if (scsi_sense_valid(&sshdr) &&
3198 /* 0x3a is medium not present */
3199 sshdr.asc == 0x3a)
3200 res = 0;
c3c94c5a
TH		 3201 }
3202
95897910
ON		 3203 /* SCSI error codes must not go to the generic layer */
3204 if (res)
3205 return -EIO;
3206
3207 return 0;
c3c94c5a
TH		 3208}
3209
1da177e4
LT		 3210/*
3211 * Send a SYNCHRONIZE CACHE instruction down to the device through
3212 * the normal SCSI command structure. Wait for the command to
3213 * complete.
3214 */
3215static void sd_shutdown(struct device *dev)
3216{
3d9a1f53 3217 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1da177e4
LT		 3218
3219 if (!sdkp)
3220 return; /* this can happen */
3221
54f57588 3222 if (pm_runtime_suspended(dev))
3d9a1f53 3223 return;
54f57588 3224
95897910 3225 if (sdkp->WCE && sdkp->media_present) {
e73aec82
MP		 3226 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3227 sd_sync_cache(sdkp);
39b7f1e2 3228 }
c3c94c5a 3229
cc5d2c8c
JB		 3230 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3231 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3232 sd_start_stop_device(sdkp, 0);
c3c94c5a 3233 }
39b7f1e2 3234}
1da177e4 3235
95897910 3236static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
c3c94c5a 3237{
3d9a1f53 3238 struct scsi_disk *sdkp = dev_get_drvdata(dev);
09ff92fe 3239 int ret = 0;
c3c94c5a
TH		 3240
3241 if (!sdkp)
3242 return 0; /* this can happen */
3243
95897910 3244 if (sdkp->WCE && sdkp->media_present) {
cc5d2c8c 3245 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a 3246 ret = sd_sync_cache(sdkp);
95897910
ON		 3247 if (ret) {
3248 /* ignore OFFLINE device */
3249 if (ret == -ENODEV)
3250 ret = 0;
09ff92fe 3251 goto done;
95897910 3252 }
c3c94c5a
TH		 3253 }
3254
691e3d31 3255 if (sdkp->device->manage_start_stop) {
cc5d2c8c 3256 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
95897910 3257 /* an error is not worth aborting a system sleep */
cc5d2c8c 3258 ret = sd_start_stop_device(sdkp, 0);
95897910
ON		 3259 if (ignore_stop_errors)
3260 ret = 0;
c3c94c5a
TH		 3261 }
3262
09ff92fe 3263done:
09ff92fe 3264 return ret;
c3c94c5a
TH		 3265}
3266
95897910
ON		 3267static int sd_suspend_system(struct device *dev)
3268{
3269 return sd_suspend_common(dev, true);
3270}
3271
3272static int sd_suspend_runtime(struct device *dev)
3273{
3274 return sd_suspend_common(dev, false);
3275}
3276
c3c94c5a
TH		 3277static int sd_resume(struct device *dev)
3278{
3d9a1f53 3279 struct scsi_disk *sdkp = dev_get_drvdata(dev);
c3c94c5a 3280
cc5d2c8c 3281 if (!sdkp->device->manage_start_stop)
3d9a1f53 3282 return 0;
c3c94c5a 3283
cc5d2c8c 3284 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3d9a1f53 3285 return sd_start_stop_device(sdkp, 1);
c3c94c5a
TH		 3286}
3287
1da177e4
LT		 3288/**
3289 * init_sd - entry point for this driver (both when built in or when
3290 * a module).
3291 *
3292 * Note: this function registers this driver with the scsi mid-level.
3293 **/
3294static int __init init_sd(void)
3295{
5e4009ba 3296 int majors = 0, i, err;
1da177e4
LT		 3297
3298 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3299
0761df9c
HR		 3300 for (i = 0; i < SD_MAJORS; i++) {
3301 if (register_blkdev(sd_major(i), "sd") != 0)
3302 continue;
3303 majors++;
3304 blk_register_region(sd_major(i), SD_MINORS, NULL,
3305 sd_default_probe, NULL, NULL);
3306 }
1da177e4
LT		 3307
3308 if (!majors)
3309 return -ENODEV;
3310
5e4009ba
JG		 3311 err = class_register(&sd_disk_class);
3312 if (err)
3313 goto err_out;
6bdaa1f1 3314
4e7392ec
MP		 3315 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3316 0, 0, NULL);
3317 if (!sd_cdb_cache) {
3318 printk(KERN_ERR "sd: can't init extended cdb cache\n");
8d964478 3319 err = -ENOMEM;
4e7392ec
MP		 3320 goto err_out_class;
3321 }
3322
3323 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3324 if (!sd_cdb_pool) {
3325 printk(KERN_ERR "sd: can't init extended cdb pool\n");
8d964478 3326 err = -ENOMEM;
4e7392ec
MP		 3327 goto err_out_cache;
3328 }
3329
afd5e34b
JD		 3330 err = scsi_register_driver(&sd_template.gendrv);
3331 if (err)
3332 goto err_out_driver;
3333
5e4009ba
JG		 3334 return 0;
3335
afd5e34b
JD		 3336err_out_driver:
3337 mempool_destroy(sd_cdb_pool);
3338
4e7392ec
MP		 3339err_out_cache:
3340 kmem_cache_destroy(sd_cdb_cache);
3341
5e4009ba
JG		 3342err_out_class:
3343 class_unregister(&sd_disk_class);
3344err_out:
3345 for (i = 0; i < SD_MAJORS; i++)
3346 unregister_blkdev(sd_major(i), "sd");
3347 return err;
1da177e4
LT		 3348}
3349
3350/**
3351 * exit_sd - exit point for this driver (when it is a module).
3352 *
3353 * Note: this function unregisters this driver from the scsi mid-level.
3354 **/
3355static void __exit exit_sd(void)
3356{
3357 int i;
3358
3359 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3360
afd5e34b 3361 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3362 mempool_destroy(sd_cdb_pool);
3363 kmem_cache_destroy(sd_cdb_cache);
3364
5e4009ba
JG		 3365 class_unregister(&sd_disk_class);
3366
0761df9c
HR		 3367 for (i = 0; i < SD_MAJORS; i++) {
3368 blk_unregister_region(sd_major(i), SD_MINORS);
1da177e4 3369 unregister_blkdev(sd_major(i), "sd");
0761df9c 3370 }
1da177e4
LT		 3371}
3372
1da177e4
LT		 3373module_init(init_sd);
3374module_exit(exit_sd);
e73aec82
MP		 3375
3376static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3377 struct scsi_sense_hdr *sshdr)
3378{
21045519
HR		 3379 scsi_print_sense_hdr(sdkp->device,
3380 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
e73aec82
MP		 3381}
3382
ef61329d
HR		 3383static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3384 int result)
e73aec82 3385{
ef61329d
HR		 3386 const char *hb_string = scsi_hostbyte_string(result);
3387 const char *db_string = scsi_driverbyte_string(result);
3388
3389 if (hb_string || db_string)
3390 sd_printk(KERN_INFO, sdkp,
3391 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3392 hb_string ? hb_string : "invalid",
3393 db_string ? db_string : "invalid");
3394 else
3395 sd_printk(KERN_INFO, sdkp,
3396 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3397 msg, host_byte(result), driver_byte(result));
e73aec82
MP		 3398}
3399
Linux kernel - Deliverables
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