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[SCSI] libsas: fix usage of ata_tf_to_fis
[linux-2.6-block.git] / drivers / scsi / sd.c
CommitLineData
1da177e4
LT		 1/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
1da177e4
LT		 35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
1da177e4
LT		 38#include <linux/mm.h>
39#include <linux/bio.h>
40#include <linux/genhd.h>
41#include <linux/hdreg.h>
42#include <linux/errno.h>
43#include <linux/idr.h>
44#include <linux/interrupt.h>
45#include <linux/init.h>
46#include <linux/blkdev.h>
47#include <linux/blkpg.h>
1da177e4 48#include <linux/delay.h>
0b950672 49#include <linux/mutex.h>
7404ad3b 50#include <linux/string_helpers.h>
4ace92fc 51#include <linux/async.h>
5a0e3ad6 52#include <linux/slab.h>
54f57588 53#include <linux/pm_runtime.h>
1da177e4 54#include <asm/uaccess.h>
8f76d151 55#include <asm/unaligned.h>
1da177e4
LT		 56
57#include <scsi/scsi.h>
58#include <scsi/scsi_cmnd.h>
59#include <scsi/scsi_dbg.h>
60#include <scsi/scsi_device.h>
61#include <scsi/scsi_driver.h>
62#include <scsi/scsi_eh.h>
63#include <scsi/scsi_host.h>
64#include <scsi/scsi_ioctl.h>
1da177e4
LT		 65#include <scsi/scsicam.h>
66
aa91696e 67#include "sd.h"
a7a20d10 68#include "scsi_priv.h"
1da177e4
LT		 69#include "scsi_logging.h"
70
f018fa55
RH		 71MODULE_AUTHOR("Eric Youngdale");
72MODULE_DESCRIPTION("SCSI disk (sd) driver");
73MODULE_LICENSE("GPL");
74
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
d7b8bcb0
MT		 91MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
f018fa55 94
870d6656 95#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
f615b48c 96#define SD_MINORS 16
870d6656 97#else
3e1a7ff8 98#define SD_MINORS 0
870d6656
TH		 99#endif
100
c98a0eb0 101static void sd_config_discard(struct scsi_disk *, unsigned int);
5db44863 102static void sd_config_write_same(struct scsi_disk *);
7b3d9545 103static int sd_revalidate_disk(struct gendisk *);
72ec24bd 104static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 105static int sd_probe(struct device *);
106static int sd_remove(struct device *);
107static void sd_shutdown(struct device *);
95897910
ON		 108static int sd_suspend_system(struct device *);
109static int sd_suspend_runtime(struct device *);
7b3d9545
LT		 110static int sd_resume(struct device *);
111static void sd_rescan(struct device *);
112static int sd_done(struct scsi_cmnd *);
18a4d0a2 113static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
7b3d9545 114static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 115static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 116static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
117static void sd_print_result(struct scsi_disk *, int);
118
4034cc68 119static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 120static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 121
122/* This semaphore is used to mediate the 0->1 reference get in the
123 * face of object destruction (i.e. we can't allow a get on an
124 * object after last put) */
0b950672 125static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 126
439d77f7
HS		 127static struct kmem_cache *sd_cdb_cache;
128static mempool_t *sd_cdb_pool;
4e7392ec 129
6bdaa1f1
JB		 130static const char *sd_cache_types[] = {
131 "write through", "none", "write back",
132 "write back, no read (daft)"
133};
134
ee959b00 135static ssize_t
e1ea2351
GKH		 136cache_type_store(struct device *dev, struct device_attribute *attr,
137 const char *buf, size_t count)
6bdaa1f1
JB		 138{
139 int i, ct = -1, rcd, wce, sp;
ee959b00 140 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 141 struct scsi_device *sdp = sdkp->device;
142 char buffer[64];
143 char *buffer_data;
144 struct scsi_mode_data data;
145 struct scsi_sense_hdr sshdr;
2ee3e26c 146 static const char temp[] = "temporary ";
6bdaa1f1
JB		 147 int len;
148
149 if (sdp->type != TYPE_DISK)
150 /* no cache control on RBC devices; theoretically they
151 * can do it, but there's probably so many exceptions
152 * it's not worth the risk */
153 return -EINVAL;
154
39c60a09
JB		 155 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
156 buf += sizeof(temp) - 1;
157 sdkp->cache_override = 1;
158 } else {
159 sdkp->cache_override = 0;
160 }
161
6391a113 162 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 163 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 164 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
165 buf[len] == '\n') {
166 ct = i;
167 break;
168 }
169 }
170 if (ct < 0)
171 return -EINVAL;
172 rcd = ct & 0x01 ? 1 : 0;
173 wce = ct & 0x02 ? 1 : 0;
39c60a09
JB		 174
175 if (sdkp->cache_override) {
176 sdkp->WCE = wce;
177 sdkp->RCD = rcd;
178 return count;
179 }
180
6bdaa1f1
JB		 181 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
182 SD_MAX_RETRIES, &data, NULL))
183 return -EINVAL;
a9312fb8 184 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 185 data.block_descriptor_length);
186 buffer_data = buffer + data.header_length +
187 data.block_descriptor_length;
188 buffer_data[2] &= ~0x05;
189 buffer_data[2] |= wce << 2 | rcd;
190 sp = buffer_data[0] & 0x80 ? 1 : 0;
191
192 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
193 SD_MAX_RETRIES, &data, &sshdr)) {
194 if (scsi_sense_valid(&sshdr))
e73aec82 195 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 196 return -EINVAL;
197 }
f98a8cae 198 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 199 return count;
200}
201
ee959b00 202static ssize_t
e1ea2351
GKH		 203manage_start_stop_show(struct device *dev, struct device_attribute *attr,
204 char *buf)
205{
206 struct scsi_disk *sdkp = to_scsi_disk(dev);
207 struct scsi_device *sdp = sdkp->device;
208
209 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
210}
211
212static ssize_t
213manage_start_stop_store(struct device *dev, struct device_attribute *attr,
214 const char *buf, size_t count)
c3c94c5a 215{
ee959b00 216 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 217 struct scsi_device *sdp = sdkp->device;
218
219 if (!capable(CAP_SYS_ADMIN))
220 return -EACCES;
221
222 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
223
224 return count;
225}
e1ea2351 226static DEVICE_ATTR_RW(manage_start_stop);
c3c94c5a 227
ee959b00 228static ssize_t
e1ea2351
GKH		 229allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
230{
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
232
233 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
234}
235
236static ssize_t
237allow_restart_store(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t count)
a144c5ae 239{
ee959b00 240 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 241 struct scsi_device *sdp = sdkp->device;
242
243 if (!capable(CAP_SYS_ADMIN))
244 return -EACCES;
245
246 if (sdp->type != TYPE_DISK)
247 return -EINVAL;
248
249 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
250
251 return count;
252}
e1ea2351 253static DEVICE_ATTR_RW(allow_restart);
a144c5ae 254
ee959b00 255static ssize_t
e1ea2351 256cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 257{
ee959b00 258 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 259 int ct = sdkp->RCD + 2*sdkp->WCE;
260
261 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
262}
e1ea2351 263static DEVICE_ATTR_RW(cache_type);
6bdaa1f1 264
ee959b00 265static ssize_t
e1ea2351 266FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 267{
ee959b00 268 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 269
270 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
271}
e1ea2351 272static DEVICE_ATTR_RO(FUA);
6bdaa1f1 273
ee959b00 274static ssize_t
e1ea2351
GKH		 275protection_type_show(struct device *dev, struct device_attribute *attr,
276 char *buf)
e0597d70
MP		 277{
278 struct scsi_disk *sdkp = to_scsi_disk(dev);
279
280 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
281}
282
8172499a 283static ssize_t
e1ea2351
GKH		 284protection_type_store(struct device *dev, struct device_attribute *attr,
285 const char *buf, size_t count)
8172499a
MP		 286{
287 struct scsi_disk *sdkp = to_scsi_disk(dev);
288 unsigned int val;
289 int err;
290
291 if (!capable(CAP_SYS_ADMIN))
292 return -EACCES;
293
294 err = kstrtouint(buf, 10, &val);
295
296 if (err)
297 return err;
298
299 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
300 sdkp->protection_type = val;
301
302 return count;
303}
e1ea2351 304static DEVICE_ATTR_RW(protection_type);
8172499a 305
518fa8e3 306static ssize_t
e1ea2351
GKH		 307protection_mode_show(struct device *dev, struct device_attribute *attr,
308 char *buf)
518fa8e3
MP		 309{
310 struct scsi_disk *sdkp = to_scsi_disk(dev);
311 struct scsi_device *sdp = sdkp->device;
312 unsigned int dif, dix;
313
314 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
315 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
316
317 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
318 dif = 0;
319 dix = 1;
320 }
321
322 if (!dif && !dix)
323 return snprintf(buf, 20, "none\n");
324
325 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
326}
e1ea2351 327static DEVICE_ATTR_RO(protection_mode);
518fa8e3 328
e0597d70 329static ssize_t
e1ea2351 330app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
e0597d70
MP		 331{
332 struct scsi_disk *sdkp = to_scsi_disk(dev);
333
334 return snprintf(buf, 20, "%u\n", sdkp->ATO);
335}
e1ea2351 336static DEVICE_ATTR_RO(app_tag_own);
e0597d70 337
e339c1a7 338static ssize_t
e1ea2351
GKH		 339thin_provisioning_show(struct device *dev, struct device_attribute *attr,
340 char *buf)
e339c1a7
MP		 341{
342 struct scsi_disk *sdkp = to_scsi_disk(dev);
343
c98a0eb0
MP		 344 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
345}
e1ea2351 346static DEVICE_ATTR_RO(thin_provisioning);
c98a0eb0
MP		 347
348static const char *lbp_mode[] = {
349 [SD_LBP_FULL] = "full",
350 [SD_LBP_UNMAP] = "unmap",
351 [SD_LBP_WS16] = "writesame_16",
352 [SD_LBP_WS10] = "writesame_10",
353 [SD_LBP_ZERO] = "writesame_zero",
354 [SD_LBP_DISABLE] = "disabled",
355};
356
357static ssize_t
e1ea2351
GKH		 358provisioning_mode_show(struct device *dev, struct device_attribute *attr,
359 char *buf)
c98a0eb0
MP		 360{
361 struct scsi_disk *sdkp = to_scsi_disk(dev);
362
363 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
364}
365
366static ssize_t
e1ea2351
GKH		 367provisioning_mode_store(struct device *dev, struct device_attribute *attr,
368 const char *buf, size_t count)
c98a0eb0
MP		 369{
370 struct scsi_disk *sdkp = to_scsi_disk(dev);
371 struct scsi_device *sdp = sdkp->device;
372
373 if (!capable(CAP_SYS_ADMIN))
374 return -EACCES;
375
376 if (sdp->type != TYPE_DISK)
377 return -EINVAL;
378
379 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
380 sd_config_discard(sdkp, SD_LBP_UNMAP);
381 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
382 sd_config_discard(sdkp, SD_LBP_WS16);
383 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
384 sd_config_discard(sdkp, SD_LBP_WS10);
385 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
386 sd_config_discard(sdkp, SD_LBP_ZERO);
387 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
388 sd_config_discard(sdkp, SD_LBP_DISABLE);
389 else
390 return -EINVAL;
391
392 return count;
e339c1a7 393}
e1ea2351 394static DEVICE_ATTR_RW(provisioning_mode);
e339c1a7 395
18a4d0a2 396static ssize_t
e1ea2351
GKH		 397max_medium_access_timeouts_show(struct device *dev,
398 struct device_attribute *attr, char *buf)
18a4d0a2
MP		 399{
400 struct scsi_disk *sdkp = to_scsi_disk(dev);
401
402 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
403}
404
405static ssize_t
e1ea2351
GKH		 406max_medium_access_timeouts_store(struct device *dev,
407 struct device_attribute *attr, const char *buf,
408 size_t count)
18a4d0a2
MP		 409{
410 struct scsi_disk *sdkp = to_scsi_disk(dev);
411 int err;
412
413 if (!capable(CAP_SYS_ADMIN))
414 return -EACCES;
415
416 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
417
418 return err ? err : count;
419}
e1ea2351 420static DEVICE_ATTR_RW(max_medium_access_timeouts);
18a4d0a2 421
5db44863 422static ssize_t
e1ea2351
GKH		 423max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
424 char *buf)
5db44863
MP		 425{
426 struct scsi_disk *sdkp = to_scsi_disk(dev);
427
428 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
429}
430
431static ssize_t
e1ea2351
GKH		 432max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
433 const char *buf, size_t count)
5db44863
MP		 434{
435 struct scsi_disk *sdkp = to_scsi_disk(dev);
436 struct scsi_device *sdp = sdkp->device;
437 unsigned long max;
438 int err;
439
440 if (!capable(CAP_SYS_ADMIN))
441 return -EACCES;
442
443 if (sdp->type != TYPE_DISK)
444 return -EINVAL;
445
446 err = kstrtoul(buf, 10, &max);
447
448 if (err)
449 return err;
450
451 if (max == 0)
452 sdp->no_write_same = 1;
66c28f97
MP		 453 else if (max <= SD_MAX_WS16_BLOCKS) {
454 sdp->no_write_same = 0;
5db44863 455 sdkp->max_ws_blocks = max;
66c28f97 456 }
5db44863
MP		 457
458 sd_config_write_same(sdkp);
459
460 return count;
461}
e1ea2351
GKH		 462static DEVICE_ATTR_RW(max_write_same_blocks);
463
464static struct attribute *sd_disk_attrs[] = {
465 &dev_attr_cache_type.attr,
466 &dev_attr_FUA.attr,
467 &dev_attr_allow_restart.attr,
468 &dev_attr_manage_start_stop.attr,
469 &dev_attr_protection_type.attr,
470 &dev_attr_protection_mode.attr,
471 &dev_attr_app_tag_own.attr,
472 &dev_attr_thin_provisioning.attr,
473 &dev_attr_provisioning_mode.attr,
474 &dev_attr_max_write_same_blocks.attr,
475 &dev_attr_max_medium_access_timeouts.attr,
476 NULL,
6bdaa1f1 477};
e1ea2351 478ATTRIBUTE_GROUPS(sd_disk);
6bdaa1f1
JB		 479
480static struct class sd_disk_class = {
481 .name = "scsi_disk",
482 .owner = THIS_MODULE,
ee959b00 483 .dev_release = scsi_disk_release,
e1ea2351 484 .dev_groups = sd_disk_groups,
6bdaa1f1 485};
1da177e4 486
691e3d31 487static const struct dev_pm_ops sd_pm_ops = {
95897910 488 .suspend = sd_suspend_system,
691e3d31 489 .resume = sd_resume,
95897910 490 .poweroff = sd_suspend_system,
691e3d31 491 .restore = sd_resume,
95897910 492 .runtime_suspend = sd_suspend_runtime,
691e3d31
AL		 493 .runtime_resume = sd_resume,
494};
495
1da177e4
LT		 496static struct scsi_driver sd_template = {
497 .owner = THIS_MODULE,
498 .gendrv = {
499 .name = "sd",
500 .probe = sd_probe,
501 .remove = sd_remove,
502 .shutdown = sd_shutdown,
691e3d31 503 .pm = &sd_pm_ops,
1da177e4
LT		 504 },
505 .rescan = sd_rescan,
7b3d9545 506 .done = sd_done,
18a4d0a2 507 .eh_action = sd_eh_action,
1da177e4
LT		 508};
509
0761df9c
HR		 510/*
511 * Dummy kobj_map->probe function.
512 * The default ->probe function will call modprobe, which is
513 * pointless as this module is already loaded.
514 */
515static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
516{
517 return NULL;
518}
519
1da177e4
LT		 520/*
521 * Device no to disk mapping:
522 *
523 * major disc2 disc p1
524 * |............|.............|....|....| <- dev_t
525 * 31 20 19 8 7 4 3 0
526 *
527 * Inside a major, we have 16k disks, however mapped non-
528 * contiguously. The first 16 disks are for major0, the next
529 * ones with major1, ... Disk 256 is for major0 again, disk 272
530 * for major1, ...
531 * As we stay compatible with our numbering scheme, we can reuse
532 * the well-know SCSI majors 8, 65--71, 136--143.
533 */
534static int sd_major(int major_idx)
535{
536 switch (major_idx) {
537 case 0:
538 return SCSI_DISK0_MAJOR;
539 case 1 ... 7:
540 return SCSI_DISK1_MAJOR + major_idx - 1;
541 case 8 ... 15:
542 return SCSI_DISK8_MAJOR + major_idx - 8;
543 default:
544 BUG();
545 return 0; /* shut up gcc */
546 }
547}
548
39b7f1e2 549static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 550{
551 struct scsi_disk *sdkp = NULL;
552
39b7f1e2
AS		 553 if (disk->private_data) {
554 sdkp = scsi_disk(disk);
555 if (scsi_device_get(sdkp->device) == 0)
ee959b00 556 get_device(&sdkp->dev);
39b7f1e2
AS		 557 else
558 sdkp = NULL;
559 }
560 return sdkp;
561}
562
563static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
564{
565 struct scsi_disk *sdkp;
566
0b950672 567 mutex_lock(&sd_ref_mutex);
39b7f1e2 568 sdkp = __scsi_disk_get(disk);
0b950672 569 mutex_unlock(&sd_ref_mutex);
1da177e4 570 return sdkp;
39b7f1e2 571}
1da177e4 572
39b7f1e2
AS		 573static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
574{
575 struct scsi_disk *sdkp;
576
0b950672 577 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 578 sdkp = dev_get_drvdata(dev);
579 if (sdkp)
580 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 581 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 582 return sdkp;
583}
584
585static void scsi_disk_put(struct scsi_disk *sdkp)
586{
587 struct scsi_device *sdev = sdkp->device;
588
0b950672 589 mutex_lock(&sd_ref_mutex);
ee959b00 590 put_device(&sdkp->dev);
1da177e4 591 scsi_device_put(sdev);
0b950672 592 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 593}
594
35e1a5d9
MP		 595static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
596{
597 unsigned int prot_op = SCSI_PROT_NORMAL;
598 unsigned int dix = scsi_prot_sg_count(scmd);
599
600 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
601 if (dif && dix)
602 prot_op = SCSI_PROT_READ_PASS;
603 else if (dif && !dix)
604 prot_op = SCSI_PROT_READ_STRIP;
605 else if (!dif && dix)
606 prot_op = SCSI_PROT_READ_INSERT;
607 } else {
608 if (dif && dix)
609 prot_op = SCSI_PROT_WRITE_PASS;
610 else if (dif && !dix)
611 prot_op = SCSI_PROT_WRITE_INSERT;
612 else if (!dif && dix)
613 prot_op = SCSI_PROT_WRITE_STRIP;
614 }
615
616 scsi_set_prot_op(scmd, prot_op);
617 scsi_set_prot_type(scmd, dif);
618}
619
c98a0eb0
MP		 620static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
621{
622 struct request_queue *q = sdkp->disk->queue;
623 unsigned int logical_block_size = sdkp->device->sector_size;
624 unsigned int max_blocks = 0;
625
626 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 627 q->limits.discard_alignment = sdkp->unmap_alignment *
628 logical_block_size;
c98a0eb0
MP		 629 q->limits.discard_granularity =
630 max(sdkp->physical_block_size,
631 sdkp->unmap_granularity * logical_block_size);
632
89730393
MP		 633 sdkp->provisioning_mode = mode;
634
c98a0eb0
MP		 635 switch (mode) {
636
637 case SD_LBP_DISABLE:
638 q->limits.max_discard_sectors = 0;
639 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
640 return;
641
642 case SD_LBP_UNMAP:
5db44863
MP		 643 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
644 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 645 break;
646
647 case SD_LBP_WS16:
5db44863
MP		 648 max_blocks = min_not_zero(sdkp->max_ws_blocks,
649 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 650 break;
651
652 case SD_LBP_WS10:
5db44863
MP		 653 max_blocks = min_not_zero(sdkp->max_ws_blocks,
654 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 655 break;
656
657 case SD_LBP_ZERO:
5db44863
MP		 658 max_blocks = min_not_zero(sdkp->max_ws_blocks,
659 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 660 q->limits.discard_zeroes_data = 1;
661 break;
662 }
663
664 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
665 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 666}
667
e339c1a7 668/**
26e85fcd 669 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
66ac0280 670 * @sdp: scsi device to operate one
e339c1a7
MP		 671 * @rq: Request to prepare
672 *
673 * Will issue either UNMAP or WRITE SAME(16) depending on preference
674 * indicated by target device.
675 **/
26e85fcd 676static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 677{
678 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 679 sector_t sector = blk_rq_pos(rq);
680 unsigned int nr_sectors = blk_rq_sectors(rq);
681 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 682 unsigned int len;
f1126e95 683 int ret;
c98a0eb0 684 char *buf;
66ac0280 685 struct page *page;
e339c1a7 686
26e85fcd
MP		 687 sector >>= ilog2(sdp->sector_size) - 9;
688 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7
MP		 689 rq->timeout = SD_TIMEOUT;
690
691 memset(rq->cmd, 0, rq->cmd_len);
692
66ac0280
CH		 693 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
694 if (!page)
695 return BLKPREP_DEFER;
696
c98a0eb0
MP		 697 switch (sdkp->provisioning_mode) {
698 case SD_LBP_UNMAP:
699 buf = page_address(page);
e339c1a7 700
66ac0280 701 rq->cmd_len = 10;
e339c1a7
MP		 702 rq->cmd[0] = UNMAP;
703 rq->cmd[8] = 24;
e339c1a7
MP		 704
705 put_unaligned_be16(6 + 16, &buf[0]);
706 put_unaligned_be16(16, &buf[2]);
707 put_unaligned_be64(sector, &buf[8]);
66ac0280 708 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 709
66ac0280 710 len = 24;
c98a0eb0
MP		 711 break;
712
713 case SD_LBP_WS16:
66ac0280 714 rq->cmd_len = 16;
e339c1a7
MP		 715 rq->cmd[0] = WRITE_SAME_16;
716 rq->cmd[1] = 0x8; /* UNMAP */
717 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 718 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
719
720 len = sdkp->device->sector_size;
c98a0eb0
MP		 721 break;
722
723 case SD_LBP_WS10:
724 case SD_LBP_ZERO:
725 rq->cmd_len = 10;
726 rq->cmd[0] = WRITE_SAME;
727 if (sdkp->provisioning_mode == SD_LBP_WS10)
728 rq->cmd[1] = 0x8; /* UNMAP */
729 put_unaligned_be32(sector, &rq->cmd[2]);
730 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
731
732 len = sdkp->device->sector_size;
733 break;
734
735 default:
09b9cc44 736 ret = BLKPREP_KILL;
c98a0eb0 737 goto out;
e339c1a7
MP		 738 }
739
66ac0280 740 blk_add_request_payload(rq, page, len);
f1126e95
FT		 741 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
742 rq->buffer = page_address(page);
26e85fcd 743 rq->__data_len = nr_bytes;
c98a0eb0
MP		 744
745out:
610a6349
FT		 746 if (ret != BLKPREP_OK) {
747 __free_page(page);
748 rq->buffer = NULL;
749 }
f1126e95
FT		 750 return ret;
751}
752
5db44863
MP		 753static void sd_config_write_same(struct scsi_disk *sdkp)
754{
755 struct request_queue *q = sdkp->disk->queue;
756 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 757
758 if (sdkp->device->no_write_same) {
759 sdkp->max_ws_blocks = 0;
760 goto out;
761 }
762
763 /* Some devices can not handle block counts above 0xffff despite
764 * supporting WRITE SAME(16). Consequently we default to 64k
765 * blocks per I/O unless the device explicitly advertises a
766 * bigger limit.
767 */
66c28f97
MP		 768 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
769 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
770 (u32)SD_MAX_WS16_BLOCKS);
771 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
772 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
773 (u32)SD_MAX_WS10_BLOCKS);
774 else {
775 sdkp->device->no_write_same = 1;
776 sdkp->max_ws_blocks = 0;
777 }
5db44863
MP		 778
779out:
66c28f97
MP		 780 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
781 (logical_block_size >> 9));
5db44863
MP		 782}
783
784/**
785 * sd_setup_write_same_cmnd - write the same data to multiple blocks
786 * @sdp: scsi device to operate one
787 * @rq: Request to prepare
788 *
789 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
790 * preference indicated by target device.
791 **/
792static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
793{
794 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
795 struct bio *bio = rq->bio;
796 sector_t sector = blk_rq_pos(rq);
797 unsigned int nr_sectors = blk_rq_sectors(rq);
798 unsigned int nr_bytes = blk_rq_bytes(rq);
799 int ret;
800
801 if (sdkp->device->no_write_same)
802 return BLKPREP_KILL;
803
804 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
805
806 sector >>= ilog2(sdp->sector_size) - 9;
807 nr_sectors >>= ilog2(sdp->sector_size) - 9;
808
809 rq->__data_len = sdp->sector_size;
810 rq->timeout = SD_WRITE_SAME_TIMEOUT;
811 memset(rq->cmd, 0, rq->cmd_len);
812
813 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
814 rq->cmd_len = 16;
815 rq->cmd[0] = WRITE_SAME_16;
816 put_unaligned_be64(sector, &rq->cmd[2]);
817 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
818 } else {
819 rq->cmd_len = 10;
820 rq->cmd[0] = WRITE_SAME;
821 put_unaligned_be32(sector, &rq->cmd[2]);
822 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
823 }
824
825 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
826 rq->__data_len = nr_bytes;
827
828 return ret;
829}
830
90467c29
FT		 831static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
832{
7e660100 833 rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER;
90467c29
FT		 834 rq->retries = SD_MAX_RETRIES;
835 rq->cmd[0] = SYNCHRONIZE_CACHE;
836 rq->cmd_len = 10;
837
838 return scsi_setup_blk_pc_cmnd(sdp, rq);
839}
840
f1126e95
FT		 841static void sd_unprep_fn(struct request_queue *q, struct request *rq)
842{
085b513f
EM		 843 struct scsi_cmnd *SCpnt = rq->special;
844
610a6349
FT		 845 if (rq->cmd_flags & REQ_DISCARD) {
846 free_page((unsigned long)rq->buffer);
847 rq->buffer = NULL;
848 }
085b513f
EM		 849 if (SCpnt->cmnd != rq->cmd) {
850 mempool_free(SCpnt->cmnd, sd_cdb_pool);
851 SCpnt->cmnd = NULL;
852 SCpnt->cmd_len = 0;
853 }
e339c1a7
MP		 854}
855
1da177e4 856/**
2db93ce8 857 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 858 * information in the request structure.
859 * @SCpnt: pointer to mid-level's per scsi command structure that
860 * contains request and into which the scsi command is written
861 *
862 * Returns 1 if successful and 0 if error (or cannot be done now).
863 **/
7f9a6bc4 864static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 865{
7f9a6bc4
JB		 866 struct scsi_cmnd *SCpnt;
867 struct scsi_device *sdp = q->queuedata;
776b23a0 868 struct gendisk *disk = rq->rq_disk;
af55ff67 869 struct scsi_disk *sdkp;
83096ebf 870 sector_t block = blk_rq_pos(rq);
18351070 871 sector_t threshold;
83096ebf 872 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 873 int ret, host_dif;
4e7392ec 874 unsigned char protect;
7f9a6bc4 875
e339c1a7
MP		 876 /*
877 * Discard request come in as REQ_TYPE_FS but we turn them into
878 * block PC requests to make life easier.
879 */
66ac0280 880 if (rq->cmd_flags & REQ_DISCARD) {
26e85fcd 881 ret = sd_setup_discard_cmnd(sdp, rq);
66ac0280 882 goto out;
5db44863
MP		 883 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
884 ret = sd_setup_write_same_cmnd(sdp, rq);
885 goto out;
90467c29
FT		 886 } else if (rq->cmd_flags & REQ_FLUSH) {
887 ret = scsi_setup_flush_cmnd(sdp, rq);
888 goto out;
66ac0280 889 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 890 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
891 goto out;
892 } else if (rq->cmd_type != REQ_TYPE_FS) {
893 ret = BLKPREP_KILL;
894 goto out;
895 }
896 ret = scsi_setup_fs_cmnd(sdp, rq);
897 if (ret != BLKPREP_OK)
898 goto out;
899 SCpnt = rq->special;
af55ff67 900 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 901
902 /* from here on until we're complete, any goto out
903 * is used for a killable error condition */
904 ret = BLKPREP_KILL;
1da177e4 905
fa0d34be 906 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 907 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 908 "count=%d\n",
909 (unsigned long long)block,
910 this_count));
1da177e4
LT		 911
912 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 913 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 914 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 915 "Finishing %u sectors\n",
916 blk_rq_sectors(rq)));
fa0d34be
MP		 917 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
918 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 919 goto out;
1da177e4
LT		 920 }
921
922 if (sdp->changed) {
923 /*
924 * quietly refuse to do anything to a changed disc until
925 * the changed bit has been reset
926 */
3ff5588d 927 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 928 goto out;
1da177e4 929 }
7f9a6bc4 930
a0899d4d 931 /*
18351070
LT		 932 * Some SD card readers can't handle multi-sector accesses which touch
933 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 934 */
18351070
LT		 935 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
936 (sdp->sector_size / 512);
937
938 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
939 if (block < threshold) {
940 /* Access up to the threshold but not beyond */
941 this_count = threshold - block;
942 } else {
943 /* Access only a single hardware sector */
944 this_count = sdp->sector_size / 512;
945 }
946 }
a0899d4d 947
fa0d34be
MP		 948 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
949 (unsigned long long)block));
1da177e4
LT		 950
951 /*
952 * If we have a 1K hardware sectorsize, prevent access to single
953 * 512 byte sectors. In theory we could handle this - in fact
954 * the scsi cdrom driver must be able to handle this because
955 * we typically use 1K blocksizes, and cdroms typically have
956 * 2K hardware sectorsizes. Of course, things are simpler
957 * with the cdrom, since it is read-only. For performance
958 * reasons, the filesystems should be able to handle this
959 * and not force the scsi disk driver to use bounce buffers
960 * for this.
961 */
962 if (sdp->sector_size == 1024) {
83096ebf 963 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 964 scmd_printk(KERN_ERR, SCpnt,
965 "Bad block number requested\n");
7f9a6bc4 966 goto out;
1da177e4
LT		 967 } else {
968 block = block >> 1;
969 this_count = this_count >> 1;
970 }
971 }
972 if (sdp->sector_size == 2048) {
83096ebf 973 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 974 scmd_printk(KERN_ERR, SCpnt,
975 "Bad block number requested\n");
7f9a6bc4 976 goto out;
1da177e4
LT		 977 } else {
978 block = block >> 2;
979 this_count = this_count >> 2;
980 }
981 }
982 if (sdp->sector_size == 4096) {
83096ebf 983 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 984 scmd_printk(KERN_ERR, SCpnt,
985 "Bad block number requested\n");
7f9a6bc4 986 goto out;
1da177e4
LT		 987 } else {
988 block = block >> 3;
989 this_count = this_count >> 3;
990 }
991 }
992 if (rq_data_dir(rq) == WRITE) {
993 if (!sdp->writeable) {
7f9a6bc4 994 goto out;
1da177e4
LT		 995 }
996 SCpnt->cmnd[0] = WRITE_6;
997 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 998
8c579ab6
MP		 999 if (blk_integrity_rq(rq))
1000 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 1001
1da177e4
LT		 1002 } else if (rq_data_dir(rq) == READ) {
1003 SCpnt->cmnd[0] = READ_6;
1004 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
1005 } else {
5953316d 1006 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
7f9a6bc4 1007 goto out;
1da177e4
LT		 1008 }
1009
fa0d34be 1010 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 1011 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1012 (rq_data_dir(rq) == WRITE) ?
1013 "writing" : "reading", this_count,
83096ebf 1014 blk_rq_sectors(rq)));
1da177e4 1015
af55ff67 1016 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 1017 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1018 if (host_dif)
4e7392ec 1019 protect = 1 << 5;
af55ff67 1020 else
4e7392ec
MP		 1021 protect = 0;
1022
1023 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1024 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1025
1026 if (unlikely(SCpnt->cmnd == NULL)) {
1027 ret = BLKPREP_DEFER;
1028 goto out;
1029 }
af55ff67 1030
4e7392ec
MP		 1031 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1032 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1033 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1034 SCpnt->cmnd[7] = 0x18;
1035 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1036 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1037
1038 /* LBA */
1039 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1040 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1041 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1042 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1043 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1044 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1045 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1046 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1047
1048 /* Expected Indirect LBA */
1049 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1050 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1051 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1052 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1053
1054 /* Transfer length */
1055 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1056 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1057 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1058 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
53ad570b 1059 } else if (sdp->use_16_for_rw) {
1da177e4 1060 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1061 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1062 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1063 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1064 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1065 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1066 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1067 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1068 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1069 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1070 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1071 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1072 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1073 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1074 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1075 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1076 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 1077 SCpnt->device->use_10_for_rw) {
1078 if (this_count > 0xffff)
1079 this_count = 0xffff;
1080
1081 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1082 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1083 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1084 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1085 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1086 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1087 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1088 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1089 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1090 } else {
33659ebb 1091 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1092 /*
1093 * This happens only if this drive failed
1094 * 10byte rw command with ILLEGAL_REQUEST
1095 * during operation and thus turned off
1096 * use_10_for_rw.
1097 */
e73aec82
MP		 1098 scmd_printk(KERN_ERR, SCpnt,
1099 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1100 goto out;
007365ad
TH		 1101 }
1102
1da177e4
LT		 1103 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1104 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1105 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1106 SCpnt->cmnd[4] = (unsigned char) this_count;
1107 SCpnt->cmnd[5] = 0;
1108 }
30b0c37b 1109 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 1110
af55ff67 1111 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 1112 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 1113 sd_prot_op(SCpnt, host_dif);
af55ff67 1114
1da177e4
LT		 1115 /*
1116 * We shouldn't disconnect in the middle of a sector, so with a dumb
1117 * host adapter, it's safe to assume that we can at least transfer
1118 * this many bytes between each connect / disconnect.
1119 */
1120 SCpnt->transfersize = sdp->sector_size;
1121 SCpnt->underflow = this_count << 9;
1122 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1123
1da177e4
LT		 1124 /*
1125 * This indicates that the command is ready from our end to be
1126 * queued.
1127 */
7f9a6bc4
JB		 1128 ret = BLKPREP_OK;
1129 out:
1130 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 1131}
1132
1133/**
1134 * sd_open - open a scsi disk device
1135 * @inode: only i_rdev member may be used
1136 * @filp: only f_mode and f_flags may be used
1137 *
1138 * Returns 0 if successful. Returns a negated errno value in case
1139 * of error.
1140 *
1141 * Note: This can be called from a user context (e.g. fsck(1) )
1142 * or from within the kernel (e.g. as a result of a mount(1) ).
1143 * In the latter case @inode and @filp carry an abridged amount
1144 * of information as noted above.
409f3499
AB		 1145 *
1146 * Locking: called with bdev->bd_mutex held.
1da177e4 1147 **/
0338e291 1148static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1149{
0338e291 1150 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1151 struct scsi_device *sdev;
1152 int retval;
1153
0338e291 1154 if (!sdkp)
1da177e4
LT		 1155 return -ENXIO;
1156
fa0d34be 1157 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1158
1159 sdev = sdkp->device;
1160
1161 /*
1162 * If the device is in error recovery, wait until it is done.
1163 * If the device is offline, then disallow any access to it.
1164 */
1165 retval = -ENXIO;
1166 if (!scsi_block_when_processing_errors(sdev))
1167 goto error_out;
1168
1169 if (sdev->removable || sdkp->write_prot)
0338e291 1170 check_disk_change(bdev);
1da177e4
LT		 1171
1172 /*
1173 * If the drive is empty, just let the open fail.
1174 */
1175 retval = -ENOMEDIUM;
0338e291 1176 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1177 goto error_out;
1178
1179 /*
1180 * If the device has the write protect tab set, have the open fail
1181 * if the user expects to be able to write to the thing.
1182 */
1183 retval = -EROFS;
0338e291 1184 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1185 goto error_out;
1186
1187 /*
1188 * It is possible that the disk changing stuff resulted in
1189 * the device being taken offline. If this is the case,
1190 * report this to the user, and don't pretend that the
1191 * open actually succeeded.
1192 */
1193 retval = -ENXIO;
1194 if (!scsi_device_online(sdev))
1195 goto error_out;
1196
409f3499 1197 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1198 if (scsi_block_when_processing_errors(sdev))
1199 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1200 }
1201
1202 return 0;
1203
1204error_out:
1205 scsi_disk_put(sdkp);
1206 return retval;
1207}
1208
1209/**
1210 * sd_release - invoked when the (last) close(2) is called on this
1211 * scsi disk.
1212 * @inode: only i_rdev member may be used
1213 * @filp: only f_mode and f_flags may be used
1214 *
1215 * Returns 0.
1216 *
1217 * Note: may block (uninterruptible) if error recovery is underway
1218 * on this disk.
409f3499
AB		 1219 *
1220 * Locking: called with bdev->bd_mutex held.
1da177e4 1221 **/
db2a144b 1222static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1223{
1da177e4
LT		 1224 struct scsi_disk *sdkp = scsi_disk(disk);
1225 struct scsi_device *sdev = sdkp->device;
1226
56937f7b 1227 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1228
7e443312 1229 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1230 if (scsi_block_when_processing_errors(sdev))
1231 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1232 }
1233
1234 /*
1235 * XXX and what if there are packets in flight and this close()
1236 * XXX is followed by a "rmmod sd_mod"?
1237 */
478a8a05 1238
1da177e4 1239 scsi_disk_put(sdkp);
1da177e4
LT		 1240}
1241
a885c8c4 1242static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1243{
1244 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1245 struct scsi_device *sdp = sdkp->device;
1246 struct Scsi_Host *host = sdp->host;
1247 int diskinfo[4];
1248
1249 /* default to most commonly used values */
1250 diskinfo[0] = 0x40; /* 1 << 6 */
1251 diskinfo[1] = 0x20; /* 1 << 5 */
1252 diskinfo[2] = sdkp->capacity >> 11;
1253
1254 /* override with calculated, extended default, or driver values */
1255 if (host->hostt->bios_param)
1256 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1257 else
1258 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1259
a885c8c4
CH		 1260 geo->heads = diskinfo[0];
1261 geo->sectors = diskinfo[1];
1262 geo->cylinders = diskinfo[2];
1da177e4
LT		 1263 return 0;
1264}
1265
1266/**
1267 * sd_ioctl - process an ioctl
1268 * @inode: only i_rdev/i_bdev members may be used
1269 * @filp: only f_mode and f_flags may be used
1270 * @cmd: ioctl command number
1271 * @arg: this is third argument given to ioctl(2) system call.
1272 * Often contains a pointer.
1273 *
25985edc 1274 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1275 * success as well). Returns a negated errno value in case of error.
1276 *
1277 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1278 * down in the scsi subsystem.
1da177e4 1279 **/
0338e291 1280static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1281 unsigned int cmd, unsigned long arg)
1282{
1da177e4 1283 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1284 struct scsi_disk *sdkp = scsi_disk(disk);
1285 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1286 void __user *p = (void __user *)arg;
1287 int error;
1288
fe2d1851
NN		 1289 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1290 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1291
0bfc96cb
PB		 1292 error = scsi_verify_blk_ioctl(bdev, cmd);
1293 if (error < 0)
1294 return error;
1295
1da177e4
LT		 1296 /*
1297 * If we are in the middle of error recovery, don't let anyone
1298 * else try and use this device. Also, if error recovery fails, it
1299 * may try and take the device offline, in which case all further
1300 * access to the device is prohibited.
1301 */
83ff6fe8 1302 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1303 (mode & FMODE_NDELAY) != 0);
1da177e4 1304 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1305 goto out;
1da177e4 1306
1da177e4
LT		 1307 /*
1308 * Send SCSI addressing ioctls directly to mid level, send other
1309 * ioctls to block level and then onto mid level if they can't be
1310 * resolved.
1311 */
1312 switch (cmd) {
1313 case SCSI_IOCTL_GET_IDLUN:
1314 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1315 error = scsi_ioctl(sdp, cmd, p);
1316 break;
1da177e4 1317 default:
577ebb37 1318 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1319 if (error != -ENOTTY)
8a6cfeb6
AB		 1320 break;
1321 error = scsi_ioctl(sdp, cmd, p);
1322 break;
1da177e4 1323 }
8a6cfeb6 1324out:
8a6cfeb6 1325 return error;
1da177e4
LT		 1326}
1327
1328static void set_media_not_present(struct scsi_disk *sdkp)
1329{
2bae0093
TH		 1330 if (sdkp->media_present)
1331 sdkp->device->changed = 1;
1332
1333 if (sdkp->device->removable) {
1334 sdkp->media_present = 0;
1335 sdkp->capacity = 0;
1336 }
1337}
1338
1339static int media_not_present(struct scsi_disk *sdkp,
1340 struct scsi_sense_hdr *sshdr)
1341{
1342 if (!scsi_sense_valid(sshdr))
1343 return 0;
1344
1345 /* not invoked for commands that could return deferred errors */
1346 switch (sshdr->sense_key) {
1347 case UNIT_ATTENTION:
1348 case NOT_READY:
1349 /* medium not present */
1350 if (sshdr->asc == 0x3A) {
1351 set_media_not_present(sdkp);
1352 return 1;
1353 }
1354 }
1355 return 0;
1da177e4
LT		 1356}
1357
1358/**
2bae0093
TH		 1359 * sd_check_events - check media events
1360 * @disk: kernel device descriptor
1361 * @clearing: disk events currently being cleared
1da177e4 1362 *
2bae0093 1363 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1364 *
1365 * Note: this function is invoked from the block subsystem.
1366 **/
2bae0093 1367static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1368{
1369 struct scsi_disk *sdkp = scsi_disk(disk);
1370 struct scsi_device *sdp = sdkp->device;
001aac25 1371 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1372 int retval;
1373
2bae0093 1374 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1375
1376 /*
1377 * If the device is offline, don't send any commands - just pretend as
1378 * if the command failed. If the device ever comes back online, we
1379 * can deal with it then. It is only because of unrecoverable errors
1380 * that we would ever take a device offline in the first place.
1381 */
285e9670
KS		 1382 if (!scsi_device_online(sdp)) {
1383 set_media_not_present(sdkp);
285e9670
KS		 1384 goto out;
1385 }
1da177e4
LT		 1386
1387 /*
1388 * Using TEST_UNIT_READY enables differentiation between drive with
1389 * no cartridge loaded - NOT READY, drive with changed cartridge -
1390 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1391 *
1392 * Drives that auto spin down. eg iomega jaz 1G, will be started
1393 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1394 * sd_revalidate() is called.
1395 */
1396 retval = -ENODEV;
285e9670 1397
001aac25
JB		 1398 if (scsi_block_when_processing_errors(sdp)) {
1399 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1400 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1401 sshdr);
1402 }
1da177e4 1403
2bae0093
TH		 1404 /* failed to execute TUR, assume media not present */
1405 if (host_byte(retval)) {
285e9670 1406 set_media_not_present(sdkp);
285e9670
KS		 1407 goto out;
1408 }
1da177e4 1409
2bae0093
TH		 1410 if (media_not_present(sdkp, sshdr))
1411 goto out;
1412
1da177e4
LT		 1413 /*
1414 * For removable scsi disk we have to recognise the presence
2bae0093 1415 * of a disk in the drive.
1da177e4 1416 */
2bae0093
TH		 1417 if (!sdkp->media_present)
1418 sdp->changed = 1;
1da177e4 1419 sdkp->media_present = 1;
285e9670 1420out:
3ff5588d 1421 /*
2bae0093 1422 * sdp->changed is set under the following conditions:
3ff5588d 1423 *
2bae0093
TH		 1424 * Medium present state has changed in either direction.
1425 * Device has indicated UNIT_ATTENTION.
3ff5588d 1426 */
001aac25 1427 kfree(sshdr);
2bae0093
TH		 1428 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1429 sdp->changed = 0;
1da177e4 1430 return retval;
1da177e4
LT		 1431}
1432
e73aec82 1433static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1434{
1da177e4 1435 int retries, res;
e73aec82 1436 struct scsi_device *sdp = sdkp->device;
7e660100
JB		 1437 const int timeout = sdp->request_queue->rq_timeout
1438 * SD_FLUSH_TIMEOUT_MULTIPLIER;
ea73a9f2 1439 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1440
1441 if (!scsi_device_online(sdp))
1442 return -ENODEV;
1443
1da177e4
LT		 1444 for (retries = 3; retries > 0; --retries) {
1445 unsigned char cmd[10] = { 0 };
1446
1447 cmd[0] = SYNCHRONIZE_CACHE;
1448 /*
1449 * Leave the rest of the command zero to indicate
1450 * flush everything.
1451 */
9b21493c 1452 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
7e660100
JB		 1453 &sshdr, timeout, SD_MAX_RETRIES,
1454 NULL, REQ_PM);
ea73a9f2 1455 if (res == 0)
1da177e4
LT		 1456 break;
1457 }
1458
e73aec82
MP		 1459 if (res) {
1460 sd_print_result(sdkp, res);
95897910 1461
e73aec82
MP		 1462 if (driver_byte(res) & DRIVER_SENSE)
1463 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 1464 /* we need to evaluate the error return */
1465 if (scsi_sense_valid(&sshdr) &&
1466 /* 0x3a is medium not present */
1467 sshdr.asc == 0x3a)
1468 /* this is no error here */
1469 return 0;
1470
1471 switch (host_byte(res)) {
1472 /* ignore errors due to racing a disconnection */
1473 case DID_BAD_TARGET:
1474 case DID_NO_CONNECT:
1475 return 0;
1476 /* signal the upper layer it might try again */
1477 case DID_BUS_BUSY:
1478 case DID_IMM_RETRY:
1479 case DID_REQUEUE:
1480 case DID_SOFT_ERROR:
1481 return -EBUSY;
1482 default:
1483 return -EIO;
1484 }
1da177e4 1485 }
3721050a 1486 return 0;
1da177e4
LT		 1487}
1488
1da177e4
LT		 1489static void sd_rescan(struct device *dev)
1490{
39b7f1e2
AS		 1491 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1492
1493 if (sdkp) {
f98a8cae 1494 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1495 scsi_disk_put(sdkp);
1496 }
1da177e4
LT		 1497}
1498
1499
1500#ifdef CONFIG_COMPAT
1501/*
1502 * This gets directly called from VFS. When the ioctl
1503 * is not recognized we go back to the other translation paths.
1504 */
0338e291
AV		 1505static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1506 unsigned int cmd, unsigned long arg)
1da177e4 1507{
0338e291 1508 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1509 int ret;
1510
1511 ret = scsi_verify_blk_ioctl(bdev, cmd);
1512 if (ret < 0)
1513 return ret;
1da177e4
LT		 1514
1515 /*
1516 * If we are in the middle of error recovery, don't let anyone
1517 * else try and use this device. Also, if error recovery fails, it
1518 * may try and take the device offline, in which case all further
1519 * access to the device is prohibited.
1520 */
1521 if (!scsi_block_when_processing_errors(sdev))
1522 return -ENODEV;
1523
1524 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1525 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1526
1527 return ret;
1528 }
1529
1530 /*
1531 * Let the static ioctl translation table take care of it.
1532 */
1533 return -ENOIOCTLCMD;
1534}
1535#endif
1536
83d5cde4 1537static const struct block_device_operations sd_fops = {
1da177e4 1538 .owner = THIS_MODULE,
0338e291
AV		 1539 .open = sd_open,
1540 .release = sd_release,
8a6cfeb6 1541 .ioctl = sd_ioctl,
a885c8c4 1542 .getgeo = sd_getgeo,
1da177e4 1543#ifdef CONFIG_COMPAT
0338e291 1544 .compat_ioctl = sd_compat_ioctl,
1da177e4 1545#endif
2bae0093 1546 .check_events = sd_check_events,
1da177e4 1547 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1548 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1549};
1550
18a4d0a2
MP		 1551/**
1552 * sd_eh_action - error handling callback
1553 * @scmd: sd-issued command that has failed
1554 * @eh_cmnd: The command that was sent during error handling
1555 * @eh_cmnd_len: Length of eh_cmnd in bytes
1556 * @eh_disp: The recovery disposition suggested by the midlayer
1557 *
1558 * This function is called by the SCSI midlayer upon completion of
1559 * an error handling command (TEST UNIT READY, START STOP UNIT,
1560 * etc.) The command sent to the device by the error handler is
1561 * stored in eh_cmnd. The result of sending the eh command is
1562 * passed in eh_disp.
1563 **/
1564static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1565 int eh_cmnd_len, int eh_disp)
1566{
1567 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1568
1569 if (!scsi_device_online(scmd->device) ||
1570 !scsi_medium_access_command(scmd))
1571 return eh_disp;
1572
1573 /*
1574 * The device has timed out executing a medium access command.
1575 * However, the TEST UNIT READY command sent during error
1576 * handling completed successfully. Either the device is in the
1577 * process of recovering or has it suffered an internal failure
1578 * that prevents access to the storage medium.
1579 */
1580 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1581 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1582 sdkp->medium_access_timed_out++;
1583
1584 /*
1585 * If the device keeps failing read/write commands but TEST UNIT
1586 * READY always completes successfully we assume that medium
1587 * access is no longer possible and take the device offline.
1588 */
1589 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1590 scmd_printk(KERN_ERR, scmd,
1591 "Medium access timeout failure. Offlining disk!\n");
1592 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1593
1594 return FAILED;
1595 }
1596
1597 return eh_disp;
1598}
1599
af55ff67
MP		 1600static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1601{
83096ebf
TH		 1602 u64 start_lba = blk_rq_pos(scmd->request);
1603 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1604 u64 bad_lba;
1605 int info_valid;
a8733c7b
JB		 1606 /*
1607 * resid is optional but mostly filled in. When it's unused,
1608 * its value is zero, so we assume the whole buffer transferred
1609 */
1610 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1611 unsigned int good_bytes;
af55ff67 1612
33659ebb 1613 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1614 return 0;
1615
1616 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1617 SCSI_SENSE_BUFFERSIZE,
1618 &bad_lba);
1619 if (!info_valid)
1620 return 0;
1621
1622 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1623 return 0;
1624
1625 if (scmd->device->sector_size < 512) {
1626 /* only legitimate sector_size here is 256 */
1627 start_lba <<= 1;
1628 end_lba <<= 1;
1629 } else {
1630 /* be careful ... don't want any overflows */
1631 u64 factor = scmd->device->sector_size / 512;
1632 do_div(start_lba, factor);
1633 do_div(end_lba, factor);
1634 }
1635
1636 /* The bad lba was reported incorrectly, we have no idea where
1637 * the error is.
1638 */
1639 if (bad_lba < start_lba || bad_lba >= end_lba)
1640 return 0;
1641
1642 /* This computation should always be done in terms of
1643 * the resolution of the device's medium.
1644 */
a8733c7b
JB		 1645 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1646 return min(good_bytes, transferred);
af55ff67
MP		 1647}
1648
1da177e4 1649/**
7b3d9545 1650 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1651 * driver has completed (successfully or otherwise) a scsi command.
1652 * @SCpnt: mid-level's per command structure.
1653 *
1654 * Note: potentially run from within an ISR. Must not block.
1655 **/
7b3d9545 1656static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1657{
1658 int result = SCpnt->result;
af55ff67 1659 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1660 struct scsi_sense_hdr sshdr;
4e7392ec 1661 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1662 struct request *req = SCpnt->request;
1da177e4
LT		 1663 int sense_valid = 0;
1664 int sense_deferred = 0;
c98a0eb0 1665 unsigned char op = SCpnt->cmnd[0];
5db44863 1666 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1667
5db44863 1668 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1669 if (!result) {
1670 good_bytes = blk_rq_bytes(req);
1671 scsi_set_resid(SCpnt, 0);
1672 } else {
1673 good_bytes = 0;
1674 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1675 }
1676 }
6a32a8ae 1677
1da177e4
LT		 1678 if (result) {
1679 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1680 if (sense_valid)
1681 sense_deferred = scsi_sense_is_deferred(&sshdr);
1682 }
1da177e4 1683#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1684 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1685 if (sense_valid) {
fa0d34be 1686 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1687 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1688 "ascq]=%x,%x,%x,%x\n",
1689 sshdr.response_code,
1690 sshdr.sense_key, sshdr.asc,
1691 sshdr.ascq));
1da177e4
LT		 1692 }
1693#endif
03aba2f7
LT		 1694 if (driver_byte(result) != DRIVER_SENSE &&
1695 (!sense_valid || sense_deferred))
1696 goto out;
1697
18a4d0a2
MP		 1698 sdkp->medium_access_timed_out = 0;
1699
03aba2f7
LT		 1700 switch (sshdr.sense_key) {
1701 case HARDWARE_ERROR:
1702 case MEDIUM_ERROR:
af55ff67 1703 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1704 break;
1705 case RECOVERED_ERROR:
af55ff67
MP		 1706 good_bytes = scsi_bufflen(SCpnt);
1707 break;
10dab226
JW		 1708 case NO_SENSE:
1709 /* This indicates a false check condition, so ignore it. An
1710 * unknown amount of data was transferred so treat it as an
1711 * error.
1712 */
1713 scsi_print_sense("sd", SCpnt);
1714 SCpnt->result = 0;
1715 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1716 break;
c98a0eb0
MP		 1717 case ABORTED_COMMAND:
1718 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1719 good_bytes = sd_completed_bytes(SCpnt);
1720 break;
1721 case ILLEGAL_REQUEST:
1722 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1723 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1724 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1725 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1726 switch (op) {
1727 case UNMAP:
1728 sd_config_discard(sdkp, SD_LBP_DISABLE);
1729 break;
1730 case WRITE_SAME_16:
1731 case WRITE_SAME:
1732 if (unmap)
1733 sd_config_discard(sdkp, SD_LBP_DISABLE);
1734 else {
1735 sdkp->device->no_write_same = 1;
1736 sd_config_write_same(sdkp);
1737
1738 good_bytes = 0;
1739 req->__data_len = blk_rq_bytes(req);
1740 req->cmd_flags |= REQ_QUIET;
1741 }
1742 }
1743 }
03aba2f7
LT		 1744 break;
1745 default:
1746 break;
1da177e4 1747 }
03aba2f7 1748 out:
af55ff67
MP		 1749 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1750 sd_dif_complete(SCpnt, good_bytes);
1751
7b3d9545 1752 return good_bytes;
1da177e4
LT		 1753}
1754
1da177e4
LT		 1755/*
1756 * spinup disk - called only in sd_revalidate_disk()
1757 */
1758static void
e73aec82 1759sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1760{
1da177e4 1761 unsigned char cmd[10];
4451e472 1762 unsigned long spintime_expire = 0;
1da177e4
LT		 1763 int retries, spintime;
1764 unsigned int the_result;
1765 struct scsi_sense_hdr sshdr;
1766 int sense_valid = 0;
1767
1768 spintime = 0;
1769
1770 /* Spin up drives, as required. Only do this at boot time */
1771 /* Spinup needs to be done for module loads too. */
1772 do {
1773 retries = 0;
1774
1775 do {
1776 cmd[0] = TEST_UNIT_READY;
1777 memset((void *) &cmd[1], 0, 9);
1778
ea73a9f2
JB		 1779 the_result = scsi_execute_req(sdkp->device, cmd,
1780 DMA_NONE, NULL, 0,
1781 &sshdr, SD_TIMEOUT,
f4f4e47e 1782 SD_MAX_RETRIES, NULL);
1da177e4 1783
b4d38e38
AS		 1784 /*
1785 * If the drive has indicated to us that it
1786 * doesn't have any media in it, don't bother
1787 * with any more polling.
1788 */
1789 if (media_not_present(sdkp, &sshdr))
1790 return;
1791
1da177e4 1792 if (the_result)
ea73a9f2 1793 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1794 retries++;
1795 } while (retries < 3 &&
1796 (!scsi_status_is_good(the_result) ||
1797 ((driver_byte(the_result) & DRIVER_SENSE) &&
1798 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1799
1da177e4
LT		 1800 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1801 /* no sense, TUR either succeeded or failed
1802 * with a status error */
e73aec82
MP		 1803 if(!spintime && !scsi_status_is_good(the_result)) {
1804 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1805 sd_print_result(sdkp, the_result);
1806 }
1da177e4
LT		 1807 break;
1808 }
1809
1810 /*
1811 * The device does not want the automatic start to be issued.
1812 */
33dd6f92 1813 if (sdkp->device->no_start_on_add)
1da177e4 1814 break;
1da177e4 1815
33dd6f92
MW		 1816 if (sense_valid && sshdr.sense_key == NOT_READY) {
1817 if (sshdr.asc == 4 && sshdr.ascq == 3)
1818 break; /* manual intervention required */
1819 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1820 break; /* standby */
1821 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1822 break; /* unavailable */
1823 /*
1824 * Issue command to spin up drive when not ready
1825 */
1da177e4 1826 if (!spintime) {
e73aec82 1827 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1828 cmd[0] = START_STOP;
1829 cmd[1] = 1; /* Return immediately */
1830 memset((void *) &cmd[2], 0, 8);
1831 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1832 if (sdkp->device->start_stop_pwr_cond)
1833 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1834 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1835 NULL, 0, &sshdr,
f4f4e47e
FT		 1836 SD_TIMEOUT, SD_MAX_RETRIES,
1837 NULL);
4451e472
AS		 1838 spintime_expire = jiffies + 100 * HZ;
1839 spintime = 1;
1da177e4 1840 }
1da177e4
LT		 1841 /* Wait 1 second for next try */
1842 msleep(1000);
1843 printk(".");
4451e472
AS		 1844
1845 /*
1846 * Wait for USB flash devices with slow firmware.
1847 * Yes, this sense key/ASC combination shouldn't
1848 * occur here. It's characteristic of these devices.
1849 */
1850 } else if (sense_valid &&
1851 sshdr.sense_key == UNIT_ATTENTION &&
1852 sshdr.asc == 0x28) {
1853 if (!spintime) {
1854 spintime_expire = jiffies + 5 * HZ;
1855 spintime = 1;
1856 }
1857 /* Wait 1 second for next try */
1858 msleep(1000);
1da177e4
LT		 1859 } else {
1860 /* we don't understand the sense code, so it's
1861 * probably pointless to loop */
1862 if(!spintime) {
e73aec82
MP		 1863 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1864 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1865 }
1866 break;
1867 }
1868
4451e472 1869 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1870
1871 if (spintime) {
1872 if (scsi_status_is_good(the_result))
1873 printk("ready\n");
1874 else
1875 printk("not responding...\n");
1876 }
1877}
1878
e0597d70
MP		 1879
1880/*
1881 * Determine whether disk supports Data Integrity Field.
1882 */
fe542396 1883static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1884{
1885 struct scsi_device *sdp = sdkp->device;
1886 u8 type;
fe542396 1887 int ret = 0;
e0597d70
MP		 1888
1889 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1890 return ret;
35e1a5d9
MP		 1891
1892 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1893
fe542396
MP		 1894 if (type > SD_DIF_TYPE3_PROTECTION)
1895 ret = -ENODEV;
1896 else if (scsi_host_dif_capable(sdp->host, type))
1897 ret = 1;
1898
1899 if (sdkp->first_scan || type != sdkp->protection_type)
1900 switch (ret) {
1901 case -ENODEV:
1902 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1903 " protection type %u. Disabling disk!\n",
1904 type);
1905 break;
1906 case 1:
1907 sd_printk(KERN_NOTICE, sdkp,
1908 "Enabling DIF Type %u protection\n", type);
1909 break;
1910 case 0:
1911 sd_printk(KERN_NOTICE, sdkp,
1912 "Disabling DIF Type %u protection\n", type);
1913 break;
1914 }
e0597d70 1915
be922f47
MP		 1916 sdkp->protection_type = type;
1917
fe542396 1918 return ret;
e0597d70
MP		 1919}
1920
0da205e0
MW		 1921static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1922 struct scsi_sense_hdr *sshdr, int sense_valid,
1923 int the_result)
1924{
1925 sd_print_result(sdkp, the_result);
1926 if (driver_byte(the_result) & DRIVER_SENSE)
1927 sd_print_sense_hdr(sdkp, sshdr);
1928 else
1929 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1930
1931 /*
1932 * Set dirty bit for removable devices if not ready -
1933 * sometimes drives will not report this properly.
1934 */
1935 if (sdp->removable &&
1936 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1937 set_media_not_present(sdkp);
0da205e0
MW		 1938
1939 /*
1940 * We used to set media_present to 0 here to indicate no media
1941 * in the drive, but some drives fail read capacity even with
1942 * media present, so we can't do that.
1943 */
1944 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1945}
1946
1947#define RC16_LEN 32
1948#if RC16_LEN > SD_BUF_SIZE
1949#error RC16_LEN must not be more than SD_BUF_SIZE
1950#endif
1951
3233ac19
JB		 1952#define READ_CAPACITY_RETRIES_ON_RESET 10
1953
0da205e0
MW		 1954static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1955 unsigned char *buffer)
ea73a9f2 1956{
1da177e4 1957 unsigned char cmd[16];
1da177e4
LT		 1958 struct scsi_sense_hdr sshdr;
1959 int sense_valid = 0;
0da205e0 1960 int the_result;
3233ac19 1961 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1962 unsigned int alignment;
0da205e0
MW		 1963 unsigned long long lba;
1964 unsigned sector_size;
1da177e4 1965
5ce524bd
HG		 1966 if (sdp->no_read_capacity_16)
1967 return -EINVAL;
1968
1da177e4 1969 do {
0da205e0
MW		 1970 memset(cmd, 0, 16);
1971 cmd[0] = SERVICE_ACTION_IN;
1972 cmd[1] = SAI_READ_CAPACITY_16;
1973 cmd[13] = RC16_LEN;
1974 memset(buffer, 0, RC16_LEN);
1975
ea73a9f2 1976 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1977 buffer, RC16_LEN, &sshdr,
1978 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1979
ea73a9f2 1980 if (media_not_present(sdkp, &sshdr))
0da205e0 1981 return -ENODEV;
1da177e4 1982
2b301307 1983 if (the_result) {
ea73a9f2 1984 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1985 if (sense_valid &&
1986 sshdr.sense_key == ILLEGAL_REQUEST &&
1987 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1988 sshdr.ascq == 0x00)
1989 /* Invalid Command Operation Code or
1990 * Invalid Field in CDB, just retry
1991 * silently with RC10 */
1992 return -EINVAL;
3233ac19
JB		 1993 if (sense_valid &&
1994 sshdr.sense_key == UNIT_ATTENTION &&
1995 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1996 /* Device reset might occur several times,
1997 * give it one more chance */
1998 if (--reset_retries > 0)
1999 continue;
2b301307 2000 }
1da177e4
LT		 2001 retries--;
2002
2003 } while (the_result && retries);
2004
0da205e0 2005 if (the_result) {
e73aec82 2006 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 2007 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2008 return -EINVAL;
2009 }
e73aec82 2010
8f76d151
DH		 2011 sector_size = get_unaligned_be32(&buffer[8]);
2012 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2013
fe542396
MP		 2014 if (sd_read_protection_type(sdkp, buffer) < 0) {
2015 sdkp->capacity = 0;
2016 return -ENODEV;
2017 }
0da205e0
MW		 2018
2019 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2020 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2021 "kernel compiled with support for large block "
2022 "devices.\n");
2023 sdkp->capacity = 0;
2024 return -EOVERFLOW;
2025 }
2026
ea09bcc9 2027 /* Logical blocks per physical block exponent */
526f7c79 2028 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 2029
2030 /* Lowest aligned logical block */
2031 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2032 blk_queue_alignment_offset(sdp->request_queue, alignment);
2033 if (alignment && sdkp->first_scan)
2034 sd_printk(KERN_NOTICE, sdkp,
2035 "physical block alignment offset: %u\n", alignment);
2036
c98a0eb0
MP		 2037 if (buffer[14] & 0x80) { /* LBPME */
2038 sdkp->lbpme = 1;
e339c1a7 2039
c98a0eb0
MP		 2040 if (buffer[14] & 0x40) /* LBPRZ */
2041 sdkp->lbprz = 1;
e339c1a7 2042
c98a0eb0 2043 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2044 }
2045
0da205e0
MW		 2046 sdkp->capacity = lba + 1;
2047 return sector_size;
2048}
2049
2050static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2051 unsigned char *buffer)
2052{
2053 unsigned char cmd[16];
2054 struct scsi_sense_hdr sshdr;
2055 int sense_valid = 0;
2056 int the_result;
3233ac19 2057 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2058 sector_t lba;
2059 unsigned sector_size;
2060
2061 do {
2062 cmd[0] = READ_CAPACITY;
2063 memset(&cmd[1], 0, 9);
2064 memset(buffer, 0, 8);
2065
2066 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2067 buffer, 8, &sshdr,
2068 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2069
2070 if (media_not_present(sdkp, &sshdr))
2071 return -ENODEV;
2072
3233ac19 2073 if (the_result) {
0da205e0 2074 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2075 if (sense_valid &&
2076 sshdr.sense_key == UNIT_ATTENTION &&
2077 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2078 /* Device reset might occur several times,
2079 * give it one more chance */
2080 if (--reset_retries > 0)
2081 continue;
2082 }
0da205e0
MW		 2083 retries--;
2084
2085 } while (the_result && retries);
2086
2087 if (the_result) {
2088 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2089 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2090 return -EINVAL;
2091 }
2092
8f76d151
DH		 2093 sector_size = get_unaligned_be32(&buffer[4]);
2094 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2095
5ce524bd
HG		 2096 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2097 /* Some buggy (usb cardreader) devices return an lba of
2098 0xffffffff when the want to report a size of 0 (with
2099 which they really mean no media is present) */
2100 sdkp->capacity = 0;
5cc10350 2101 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2102 return sector_size;
2103 }
2104
0da205e0
MW		 2105 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2106 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2107 "kernel compiled with support for large block "
2108 "devices.\n");
2109 sdkp->capacity = 0;
2110 return -EOVERFLOW;
2111 }
2112
2113 sdkp->capacity = lba + 1;
526f7c79 2114 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2115 return sector_size;
2116}
2117
2b301307
MW		 2118static int sd_try_rc16_first(struct scsi_device *sdp)
2119{
f87146bb
HR		 2120 if (sdp->host->max_cmd_len < 16)
2121 return 0;
6a0bdffa
AS		 2122 if (sdp->try_rc_10_first)
2123 return 0;
2b301307
MW		 2124 if (sdp->scsi_level > SCSI_SPC_2)
2125 return 1;
2126 if (scsi_device_protection(sdp))
2127 return 1;
2128 return 0;
2129}
2130
0da205e0
MW		 2131/*
2132 * read disk capacity
2133 */
2134static void
2135sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2136{
2137 int sector_size;
2138 struct scsi_device *sdp = sdkp->device;
70a9b873 2139 sector_t old_capacity = sdkp->capacity;
0da205e0 2140
2b301307 2141 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2142 sector_size = read_capacity_16(sdkp, sdp, buffer);
2143 if (sector_size == -EOVERFLOW)
1da177e4 2144 goto got_data;
2b301307
MW		 2145 if (sector_size == -ENODEV)
2146 return;
2147 if (sector_size < 0)
2148 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2149 if (sector_size < 0)
2150 return;
1da177e4 2151 } else {
0da205e0
MW		 2152 sector_size = read_capacity_10(sdkp, sdp, buffer);
2153 if (sector_size == -EOVERFLOW)
2154 goto got_data;
2155 if (sector_size < 0)
2156 return;
2157 if ((sizeof(sdkp->capacity) > 4) &&
2158 (sdkp->capacity > 0xffffffffULL)) {
2159 int old_sector_size = sector_size;
2160 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2161 "Trying to use READ CAPACITY(16).\n");
2162 sector_size = read_capacity_16(sdkp, sdp, buffer);
2163 if (sector_size < 0) {
2164 sd_printk(KERN_NOTICE, sdkp,
2165 "Using 0xffffffff as device size\n");
2166 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2167 sector_size = old_sector_size;
2168 goto got_data;
2169 }
2170 }
2171 }
1da177e4 2172
5c211caa
AS		 2173 /* Some devices are known to return the total number of blocks,
2174 * not the highest block number. Some devices have versions
2175 * which do this and others which do not. Some devices we might
2176 * suspect of doing this but we don't know for certain.
2177 *
2178 * If we know the reported capacity is wrong, decrement it. If
2179 * we can only guess, then assume the number of blocks is even
2180 * (usually true but not always) and err on the side of lowering
2181 * the capacity.
2182 */
2183 if (sdp->fix_capacity ||
2184 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2185 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2186 "from its reported value: %llu\n",
2187 (unsigned long long) sdkp->capacity);
1da177e4 2188 --sdkp->capacity;
61bf54b7
ON		 2189 }
2190
1da177e4
LT		 2191got_data:
2192 if (sector_size == 0) {
2193 sector_size = 512;
e73aec82
MP		 2194 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2195 "assuming 512.\n");
1da177e4
LT		 2196 }
2197
2198 if (sector_size != 512 &&
2199 sector_size != 1024 &&
2200 sector_size != 2048 &&
2201 sector_size != 4096 &&
2202 sector_size != 256) {
e73aec82
MP		 2203 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2204 sector_size);
1da177e4
LT		 2205 /*
2206 * The user might want to re-format the drive with
2207 * a supported sectorsize. Once this happens, it
2208 * would be relatively trivial to set the thing up.
2209 * For this reason, we leave the thing in the table.
2210 */
2211 sdkp->capacity = 0;
2212 /*
2213 * set a bogus sector size so the normal read/write
2214 * logic in the block layer will eventually refuse any
2215 * request on this device without tripping over power
2216 * of two sector size assumptions
2217 */
2218 sector_size = 512;
2219 }
e1defc4f 2220 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2221
1da177e4 2222 {
7404ad3b 2223 char cap_str_2[10], cap_str_10[10];
520a2c27 2224 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2225
7404ad3b
JB		 2226 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2227 sizeof(cap_str_2));
2228 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2229 sizeof(cap_str_10));
1da177e4 2230
ea09bcc9 2231 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2232 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2233 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2234 (unsigned long long)sdkp->capacity,
2235 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2236
526f7c79 2237 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2238 sd_printk(KERN_NOTICE, sdkp,
2239 "%u-byte physical blocks\n",
526f7c79 2240 sdkp->physical_block_size);
ea09bcc9 2241 }
1da177e4
LT		 2242 }
2243
53ad570b
JH		 2244 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2245
1da177e4
LT		 2246 /* Rescale capacity to 512-byte units */
2247 if (sector_size == 4096)
2248 sdkp->capacity <<= 3;
2249 else if (sector_size == 2048)
2250 sdkp->capacity <<= 2;
2251 else if (sector_size == 1024)
2252 sdkp->capacity <<= 1;
2253 else if (sector_size == 256)
2254 sdkp->capacity >>= 1;
2255
526f7c79
MP		 2256 blk_queue_physical_block_size(sdp->request_queue,
2257 sdkp->physical_block_size);
1da177e4
LT		 2258 sdkp->device->sector_size = sector_size;
2259}
2260
2261/* called with buffer of length 512 */
2262static inline int
ea73a9f2
JB		 2263sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2264 unsigned char *buffer, int len, struct scsi_mode_data *data,
2265 struct scsi_sense_hdr *sshdr)
1da177e4 2266{
ea73a9f2 2267 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2268 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2269 sshdr);
1da177e4
LT		 2270}
2271
2272/*
2273 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2274 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2275 */
2276static void
e73aec82 2277sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2278{
1da177e4 2279 int res;
ea73a9f2 2280 struct scsi_device *sdp = sdkp->device;
1da177e4 2281 struct scsi_mode_data data;
70a9b873 2282 int old_wp = sdkp->write_prot;
1da177e4
LT		 2283
2284 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2285 if (sdp->skip_ms_page_3f) {
e73aec82 2286 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2287 return;
2288 }
2289
ea73a9f2
JB		 2290 if (sdp->use_192_bytes_for_3f) {
2291 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2292 } else {
2293 /*
2294 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2295 * We have to start carefully: some devices hang if we ask
2296 * for more than is available.
2297 */
ea73a9f2 2298 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2299
2300 /*
2301 * Second attempt: ask for page 0 When only page 0 is
2302 * implemented, a request for page 3F may return Sense Key
2303 * 5: Illegal Request, Sense Code 24: Invalid field in
2304 * CDB.
2305 */
2306 if (!scsi_status_is_good(res))
ea73a9f2 2307 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2308
2309 /*
2310 * Third attempt: ask 255 bytes, as we did earlier.
2311 */
2312 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2313 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2314 &data, NULL);
1da177e4
LT		 2315 }
2316
2317 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2318 sd_printk(KERN_WARNING, sdkp,
2319 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2320 } else {
2321 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2322 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2323 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2324 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2325 sdkp->write_prot ? "on" : "off");
2326 sd_printk(KERN_DEBUG, sdkp,
2327 "Mode Sense: %02x %02x %02x %02x\n",
2328 buffer[0], buffer[1], buffer[2], buffer[3]);
2329 }
1da177e4
LT		 2330 }
2331}
2332
2333/*
2334 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2335 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2336 */
2337static void
e73aec82 2338sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2339{
1da177e4 2340 int len = 0, res;
ea73a9f2 2341 struct scsi_device *sdp = sdkp->device;
1da177e4 2342
631e8a13
AV		 2343 int dbd;
2344 int modepage;
0bcaa111 2345 int first_len;
1da177e4
LT		 2346 struct scsi_mode_data data;
2347 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2348 int old_wce = sdkp->WCE;
2349 int old_rcd = sdkp->RCD;
2350 int old_dpofua = sdkp->DPOFUA;
1da177e4 2351
39c60a09
JB		 2352
2353 if (sdkp->cache_override)
2354 return;
2355
0bcaa111
LT		 2356 first_len = 4;
2357 if (sdp->skip_ms_page_8) {
2358 if (sdp->type == TYPE_RBC)
2359 goto defaults;
2360 else {
2361 if (sdp->skip_ms_page_3f)
2362 goto defaults;
2363 modepage = 0x3F;
2364 if (sdp->use_192_bytes_for_3f)
2365 first_len = 192;
2366 dbd = 0;
2367 }
2368 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2369 modepage = 6;
2370 dbd = 8;
2371 } else {
2372 modepage = 8;
2373 dbd = 0;
2374 }
2375
1da177e4 2376 /* cautiously ask */
0bcaa111
LT		 2377 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2378 &data, &sshdr);
1da177e4
LT		 2379
2380 if (!scsi_status_is_good(res))
2381 goto bad_sense;
2382
6d73c851
AV		 2383 if (!data.header_length) {
2384 modepage = 6;
0bcaa111 2385 first_len = 0;
e73aec82 2386 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2387 }
2388
1da177e4
LT		 2389 /* that went OK, now ask for the proper length */
2390 len = data.length;
2391
2392 /*
2393 * We're only interested in the first three bytes, actually.
2394 * But the data cache page is defined for the first 20.
2395 */
2396 if (len < 3)
2397 goto bad_sense;
0bcaa111
LT		 2398 else if (len > SD_BUF_SIZE) {
2399 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2400 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2401 len = SD_BUF_SIZE;
2402 }
2403 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2404 len = 192;
1da177e4
LT		 2405
2406 /* Get the data */
0bcaa111
LT		 2407 if (len > first_len)
2408 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2409 &data, &sshdr);
1da177e4
LT		 2410
2411 if (scsi_status_is_good(res)) {
631e8a13 2412 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2413
0bcaa111
LT		 2414 while (offset < len) {
2415 u8 page_code = buffer[offset] & 0x3F;
2416 u8 spf = buffer[offset] & 0x40;
2417
2418 if (page_code == 8 || page_code == 6) {
2419 /* We're interested only in the first 3 bytes.
2420 */
2421 if (len - offset <= 2) {
2422 sd_printk(KERN_ERR, sdkp, "Incomplete "
2423 "mode parameter data\n");
2424 goto defaults;
2425 } else {
2426 modepage = page_code;
2427 goto Page_found;
2428 }
2429 } else {
2430 /* Go to the next page */
2431 if (spf && len - offset > 3)
2432 offset += 4 + (buffer[offset+2] << 8) +
2433 buffer[offset+3];
2434 else if (!spf && len - offset > 1)
2435 offset += 2 + buffer[offset+1];
2436 else {
2437 sd_printk(KERN_ERR, sdkp, "Incomplete "
2438 "mode parameter data\n");
2439 goto defaults;
2440 }
2441 }
48970800
AV		 2442 }
2443
984f1733
AS		 2444 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2445 goto defaults;
2446
0bcaa111 2447 Page_found:
631e8a13
AV		 2448 if (modepage == 8) {
2449 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2450 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2451 } else {
2452 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2453 sdkp->RCD = 0;
2454 }
1da177e4 2455
007365ad
TH		 2456 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2457 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2458 sd_printk(KERN_NOTICE, sdkp,
2459 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2460 sdkp->DPOFUA = 0;
2461 }
2462
70a9b873
MP		 2463 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2464 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2465 sd_printk(KERN_NOTICE, sdkp,
2466 "Write cache: %s, read cache: %s, %s\n",
2467 sdkp->WCE ? "enabled" : "disabled",
2468 sdkp->RCD ? "disabled" : "enabled",
2469 sdkp->DPOFUA ? "supports DPO and FUA"
2470 : "doesn't support DPO or FUA");
1da177e4
LT		 2471
2472 return;
2473 }
2474
2475bad_sense:
ea73a9f2 2476 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2477 sshdr.sense_key == ILLEGAL_REQUEST &&
2478 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2479 /* Invalid field in CDB */
2480 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2481 else
e73aec82 2482 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2483
2484defaults:
b81478d8
NJ		 2485 if (sdp->wce_default_on) {
2486 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2487 sdkp->WCE = 1;
2488 } else {
2489 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2490 sdkp->WCE = 0;
2491 }
1da177e4 2492 sdkp->RCD = 0;
48970800 2493 sdkp->DPOFUA = 0;
1da177e4
LT		 2494}
2495
e0597d70
MP		 2496/*
2497 * The ATO bit indicates whether the DIF application tag is available
2498 * for use by the operating system.
2499 */
439d77f7 2500static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2501{
2502 int res, offset;
2503 struct scsi_device *sdp = sdkp->device;
2504 struct scsi_mode_data data;
2505 struct scsi_sense_hdr sshdr;
2506
2507 if (sdp->type != TYPE_DISK)
2508 return;
2509
2510 if (sdkp->protection_type == 0)
2511 return;
2512
2513 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2514 SD_MAX_RETRIES, &data, &sshdr);
2515
2516 if (!scsi_status_is_good(res) || !data.header_length ||
2517 data.length < 6) {
2518 sd_printk(KERN_WARNING, sdkp,
2519 "getting Control mode page failed, assume no ATO\n");
2520
2521 if (scsi_sense_valid(&sshdr))
2522 sd_print_sense_hdr(sdkp, &sshdr);
2523
2524 return;
2525 }
2526
2527 offset = data.header_length + data.block_descriptor_length;
2528
2529 if ((buffer[offset] & 0x3f) != 0x0a) {
2530 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2531 return;
2532 }
2533
2534 if ((buffer[offset + 5] & 0x80) == 0)
2535 return;
2536
2537 sdkp->ATO = 1;
2538
2539 return;
2540}
2541
d11b6916
MP		 2542/**
2543 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2544 * @disk: disk to query
2545 */
2546static void sd_read_block_limits(struct scsi_disk *sdkp)
2547{
2548 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2549 const int vpd_len = 64;
e3deec09 2550 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2551
e3deec09
JB		 2552 if (!buffer ||
2553 /* Block Limits VPD */
2554 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2555 goto out;
d11b6916
MP		 2556
2557 blk_queue_io_min(sdkp->disk->queue,
2558 get_unaligned_be16(&buffer[6]) * sector_sz);
2559 blk_queue_io_opt(sdkp->disk->queue,
2560 get_unaligned_be32(&buffer[12]) * sector_sz);
2561
c98a0eb0
MP		 2562 if (buffer[3] == 0x3c) {
2563 unsigned int lba_count, desc_count;
e339c1a7 2564
5db44863 2565 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2566
c98a0eb0 2567 if (!sdkp->lbpme)
045d3fe7 2568 goto out;
045d3fe7 2569
c98a0eb0
MP		 2570 lba_count = get_unaligned_be32(&buffer[20]);
2571 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2572
c98a0eb0
MP		 2573 if (lba_count && desc_count)
2574 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2575
c98a0eb0 2576 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2577
2578 if (buffer[32] & 0x80)
c98a0eb0 2579 sdkp->unmap_alignment =
e339c1a7 2580 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2581
2582 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2583
2584 if (sdkp->max_unmap_blocks)
2585 sd_config_discard(sdkp, SD_LBP_UNMAP);
2586 else
2587 sd_config_discard(sdkp, SD_LBP_WS16);
2588
2589 } else { /* LBP VPD page tells us what to use */
2590
2591 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2592 sd_config_discard(sdkp, SD_LBP_UNMAP);
2593 else if (sdkp->lbpws)
2594 sd_config_discard(sdkp, SD_LBP_WS16);
2595 else if (sdkp->lbpws10)
2596 sd_config_discard(sdkp, SD_LBP_WS10);
2597 else
2598 sd_config_discard(sdkp, SD_LBP_DISABLE);
2599 }
e339c1a7
MP		 2600 }
2601
e3deec09 2602 out:
d11b6916
MP		 2603 kfree(buffer);
2604}
2605
3821d768
MP		 2606/**
2607 * sd_read_block_characteristics - Query block dev. characteristics
2608 * @disk: disk to query
2609 */
2610static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2611{
e3deec09 2612 unsigned char *buffer;
3821d768 2613 u16 rot;
bb2d3de1 2614 const int vpd_len = 64;
3821d768 2615
e3deec09 2616 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2617
e3deec09
JB		 2618 if (!buffer ||
2619 /* Block Device Characteristics VPD */
2620 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2621 goto out;
3821d768
MP		 2622
2623 rot = get_unaligned_be16(&buffer[4]);
2624
2625 if (rot == 1)
2626 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2627
e3deec09 2628 out:
3821d768
MP		 2629 kfree(buffer);
2630}
2631
045d3fe7 2632/**
c98a0eb0 2633 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2634 * @disk: disk to query
2635 */
c98a0eb0 2636static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2637{
2638 unsigned char *buffer;
2639 const int vpd_len = 8;
2640
c98a0eb0 2641 if (sdkp->lbpme == 0)
045d3fe7
MP		 2642 return;
2643
2644 buffer = kmalloc(vpd_len, GFP_KERNEL);
2645
2646 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2647 goto out;
2648
c98a0eb0
MP		 2649 sdkp->lbpvpd = 1;
2650 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2651 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2652 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2653
2654 out:
2655 kfree(buffer);
2656}
2657
5db44863
MP		 2658static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2659{
66c28f97
MP		 2660 struct scsi_device *sdev = sdkp->device;
2661
2662 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af73623f
BS		 2663 /* too large values might cause issues with arcmsr */
2664 int vpd_buf_len = 64;
2665
66c28f97
MP		 2666 sdev->no_report_opcodes = 1;
2667
2668 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2669 * CODES is unsupported and the device has an ATA
2670 * Information VPD page (SAT).
2671 */
af73623f 2672 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
66c28f97
MP		 2673 sdev->no_write_same = 1;
2674 }
2675
2676 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2677 sdkp->ws16 = 1;
66c28f97
MP		 2678
2679 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2680 sdkp->ws10 = 1;
5db44863
MP		 2681}
2682
ffd4bc2a
MP		 2683static int sd_try_extended_inquiry(struct scsi_device *sdp)
2684{
2685 /*
2686 * Although VPD inquiries can go to SCSI-2 type devices,
2687 * some USB ones crash on receiving them, and the pages
2688 * we currently ask for are for SPC-3 and beyond
2689 */
09b6b51b 2690 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2691 return 1;
2692 return 0;
2693}
2694
1da177e4
LT		 2695/**
2696 * sd_revalidate_disk - called the first time a new disk is seen,
2697 * performs disk spin up, read_capacity, etc.
2698 * @disk: struct gendisk we care about
2699 **/
2700static int sd_revalidate_disk(struct gendisk *disk)
2701{
2702 struct scsi_disk *sdkp = scsi_disk(disk);
2703 struct scsi_device *sdp = sdkp->device;
1da177e4 2704 unsigned char *buffer;
4913efe4 2705 unsigned flush = 0;
1da177e4 2706
fa0d34be
MP		 2707 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2708 "sd_revalidate_disk\n"));
1da177e4
LT		 2709
2710 /*
2711 * If the device is offline, don't try and read capacity or any
2712 * of the other niceties.
2713 */
2714 if (!scsi_device_online(sdp))
2715 goto out;
2716
a6123f14 2717 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2718 if (!buffer) {
e73aec82
MP		 2719 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2720 "allocation failure.\n");
ea73a9f2 2721 goto out;
1da177e4
LT		 2722 }
2723
e73aec82 2724 sd_spinup_disk(sdkp);
1da177e4
LT		 2725
2726 /*
2727 * Without media there is no reason to ask; moreover, some devices
2728 * react badly if we do.
2729 */
2730 if (sdkp->media_present) {
e73aec82 2731 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2732
2733 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2734 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2735 sd_read_block_limits(sdkp);
2736 sd_read_block_characteristics(sdkp);
2737 }
2738
e73aec82
MP		 2739 sd_read_write_protect_flag(sdkp, buffer);
2740 sd_read_cache_type(sdkp, buffer);
e0597d70 2741 sd_read_app_tag_own(sdkp, buffer);
5db44863 2742 sd_read_write_same(sdkp, buffer);
1da177e4 2743 }
461d4e90 2744
70a9b873
MP		 2745 sdkp->first_scan = 0;
2746
461d4e90
TH		 2747 /*
2748 * We now have all cache related info, determine how we deal
4913efe4 2749 * with flush requests.
461d4e90 2750 */
4913efe4
TH		 2751 if (sdkp->WCE) {
2752 flush |= REQ_FLUSH;
2753 if (sdkp->DPOFUA)
2754 flush |= REQ_FUA;
2755 }
461d4e90 2756
4913efe4 2757 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2758
1da177e4 2759 set_capacity(disk, sdkp->capacity);
5db44863 2760 sd_config_write_same(sdkp);
1da177e4
LT		 2761 kfree(buffer);
2762
1da177e4
LT		 2763 out:
2764 return 0;
2765}
2766
72ec24bd
TH		 2767/**
2768 * sd_unlock_native_capacity - unlock native capacity
2769 * @disk: struct gendisk to set capacity for
2770 *
2771 * Block layer calls this function if it detects that partitions
2772 * on @disk reach beyond the end of the device. If the SCSI host
2773 * implements ->unlock_native_capacity() method, it's invoked to
2774 * give it a chance to adjust the device capacity.
2775 *
2776 * CONTEXT:
2777 * Defined by block layer. Might sleep.
2778 */
2779static void sd_unlock_native_capacity(struct gendisk *disk)
2780{
2781 struct scsi_device *sdev = scsi_disk(disk)->device;
2782
2783 if (sdev->host->hostt->unlock_native_capacity)
2784 sdev->host->hostt->unlock_native_capacity(sdev);
2785}
2786
3e1a7ff8
TH		 2787/**
2788 * sd_format_disk_name - format disk name
2789 * @prefix: name prefix - ie. "sd" for SCSI disks
2790 * @index: index of the disk to format name for
2791 * @buf: output buffer
2792 * @buflen: length of the output buffer
2793 *
2794 * SCSI disk names starts at sda. The 26th device is sdz and the
2795 * 27th is sdaa. The last one for two lettered suffix is sdzz
2796 * which is followed by sdaaa.
2797 *
2798 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2799 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2800 * determined using similar method as 26 base conversion with the
2801 * index shifted -1 after each digit is computed.
2802 *
2803 * CONTEXT:
2804 * Don't care.
2805 *
2806 * RETURNS:
2807 * 0 on success, -errno on failure.
2808 */
2809static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2810{
2811 const int base = 'z' - 'a' + 1;
2812 char *begin = buf + strlen(prefix);
2813 char *end = buf + buflen;
2814 char *p;
2815 int unit;
2816
2817 p = end - 1;
2818 *p = '\0';
2819 unit = base;
2820 do {
2821 if (p == begin)
2822 return -EINVAL;
2823 *--p = 'a' + (index % unit);
2824 index = (index / unit) - 1;
2825 } while (index >= 0);
2826
2827 memmove(begin, p, end - p);
2828 memcpy(buf, prefix, strlen(prefix));
2829
2830 return 0;
2831}
2832
4ace92fc
AV		 2833/*
2834 * The asynchronous part of sd_probe
2835 */
2836static void sd_probe_async(void *data, async_cookie_t cookie)
2837{
2838 struct scsi_disk *sdkp = data;
2839 struct scsi_device *sdp;
2840 struct gendisk *gd;
2841 u32 index;
2842 struct device *dev;
2843
2844 sdp = sdkp->device;
2845 gd = sdkp->disk;
2846 index = sdkp->index;
2847 dev = &sdp->sdev_gendev;
2848
1a03ae0f
MR		 2849 gd->major = sd_major((index & 0xf0) >> 4);
2850 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2851 gd->minors = SD_MINORS;
2852
4ace92fc
AV		 2853 gd->fops = &sd_fops;
2854 gd->private_data = &sdkp->driver;
2855 gd->queue = sdkp->device->request_queue;
2856
70a9b873
MP		 2857 /* defaults, until the device tells us otherwise */
2858 sdp->sector_size = 512;
2859 sdkp->capacity = 0;
2860 sdkp->media_present = 1;
2861 sdkp->write_prot = 0;
39c60a09 2862 sdkp->cache_override = 0;
70a9b873
MP		 2863 sdkp->WCE = 0;
2864 sdkp->RCD = 0;
2865 sdkp->ATO = 0;
2866 sdkp->first_scan = 1;
18a4d0a2 2867 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2868
4ace92fc
AV		 2869 sd_revalidate_disk(gd);
2870
2871 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2872 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2873
2874 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2875 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2876 if (sdp->removable) {
4ace92fc 2877 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2878 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2879 }
4ace92fc 2880
10c580e4 2881 blk_pm_runtime_init(sdp->request_queue, dev);
4ace92fc 2882 add_disk(gd);
fe542396
MP		 2883 if (sdkp->capacity)
2884 sd_dif_config_host(sdkp);
4ace92fc 2885
3821d768
MP		 2886 sd_revalidate_disk(gd);
2887
4ace92fc
AV		 2888 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2889 sdp->removable ? "removable " : "");
478a8a05 2890 scsi_autopm_put_device(sdp);
ea038f63 2891 put_device(&sdkp->dev);
4ace92fc
AV		 2892}
2893
1da177e4
LT		 2894/**
2895 * sd_probe - called during driver initialization and whenever a
2896 * new scsi device is attached to the system. It is called once
2897 * for each scsi device (not just disks) present.
2898 * @dev: pointer to device object
2899 *
2900 * Returns 0 if successful (or not interested in this scsi device
2901 * (e.g. scanner)); 1 when there is an error.
2902 *
2903 * Note: this function is invoked from the scsi mid-level.
2904 * This function sets up the mapping between a given
2905 * <host,channel,id,lun> (found in sdp) and new device name
2906 * (e.g. /dev/sda). More precisely it is the block device major
2907 * and minor number that is chosen here.
2908 *
2db93ce8
PU		 2909 * Assume sd_probe is not re-entrant (for time being)
2910 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2911 **/
2912static int sd_probe(struct device *dev)
2913{
2914 struct scsi_device *sdp = to_scsi_device(dev);
2915 struct scsi_disk *sdkp;
2916 struct gendisk *gd;
439d77f7 2917 int index;
1da177e4
LT		 2918 int error;
2919
2920 error = -ENODEV;
631e8a13 2921 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2922 goto out;
2923
9ccfc756 2924 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2925 "sd_probe\n"));
1da177e4
LT		 2926
2927 error = -ENOMEM;
24669f75 2928 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2929 if (!sdkp)
2930 goto out;
2931
689d6fac 2932 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2933 if (!gd)
2934 goto out_free;
2935
f27bac27
TH		 2936 do {
2937 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2938 goto out_put;
1da177e4 2939
4034cc68 2940 spin_lock(&sd_index_lock);
f27bac27 2941 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2942 spin_unlock(&sd_index_lock);
f27bac27 2943 } while (error == -EAGAIN);
1da177e4 2944
21208ae5
DK		 2945 if (error) {
2946 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2947 goto out_put;
1a03ae0f
MR		 2948 }
2949
3e1a7ff8 2950 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2951 if (error) {
2952 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2953 goto out_free_index;
21208ae5 2954 }
f27bac27 2955
1da177e4
LT		 2956 sdkp->device = sdp;
2957 sdkp->driver = &sd_template;
2958 sdkp->disk = gd;
2959 sdkp->index = index;
409f3499 2960 atomic_set(&sdkp->openers, 0);
9e1a1537 2961 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2962
601e7638
JB		 2963 if (!sdp->request_queue->rq_timeout) {
2964 if (sdp->type != TYPE_MOD)
2965 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2966 else
2967 blk_queue_rq_timeout(sdp->request_queue,
2968 SD_MOD_TIMEOUT);
2969 }
2970
2971 device_initialize(&sdkp->dev);
478a8a05 2972 sdkp->dev.parent = dev;
601e7638 2973 sdkp->dev.class = &sd_disk_class;
02aa2a37 2974 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
601e7638
JB		 2975
2976 if (device_add(&sdkp->dev))
2977 goto out_free_index;
2978
478a8a05
AS		 2979 get_device(dev);
2980 dev_set_drvdata(dev, sdkp);
601e7638 2981
ea038f63 2982 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2983 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2984
2985 return 0;
2986
f27bac27 2987 out_free_index:
4034cc68 2988 spin_lock(&sd_index_lock);
f27bac27 2989 ida_remove(&sd_index_ida, index);
4034cc68 2990 spin_unlock(&sd_index_lock);
6bdaa1f1 2991 out_put:
1da177e4 2992 put_disk(gd);
6bdaa1f1 2993 out_free:
1da177e4 2994 kfree(sdkp);
6bdaa1f1 2995 out:
1da177e4
LT		 2996 return error;
2997}
2998
2999/**
3000 * sd_remove - called whenever a scsi disk (previously recognized by
3001 * sd_probe) is detached from the system. It is called (potentially
3002 * multiple times) during sd module unload.
3003 * @sdp: pointer to mid level scsi device object
3004 *
3005 * Note: this function is invoked from the scsi mid-level.
3006 * This function potentially frees up a device name (e.g. /dev/sdc)
3007 * that could be re-used by a subsequent sd_probe().
3008 * This function is not called when the built-in sd driver is "exit-ed".
3009 **/
3010static int sd_remove(struct device *dev)
3011{
601e7638 3012 struct scsi_disk *sdkp;
0761df9c 3013 dev_t devt;
1da177e4 3014
601e7638 3015 sdkp = dev_get_drvdata(dev);
0761df9c 3016 devt = disk_devt(sdkp->disk);
478a8a05
AS		 3017 scsi_autopm_get_device(sdkp->device);
3018
a7a20d10 3019 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 3020 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 3021 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 3022 device_del(&sdkp->dev);
1da177e4
LT		 3023 del_gendisk(sdkp->disk);
3024 sd_shutdown(dev);
39b7f1e2 3025
0761df9c
HR		 3026 blk_register_region(devt, SD_MINORS, NULL,
3027 sd_default_probe, NULL, NULL);
3028
0b950672 3029 mutex_lock(&sd_ref_mutex);
39b7f1e2 3030 dev_set_drvdata(dev, NULL);
ee959b00 3031 put_device(&sdkp->dev);
0b950672 3032 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3033
3034 return 0;
3035}
3036
3037/**
3038 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3039 * @dev: pointer to embedded class device
1da177e4 3040 *
0b950672 3041 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3042 * called on last put, you should always use the scsi_disk_get()
3043 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3044 * and never do a direct put_device.
1da177e4 3045 **/
ee959b00 3046static void scsi_disk_release(struct device *dev)
1da177e4 3047{
ee959b00 3048 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3049 struct gendisk *disk = sdkp->disk;
3050
4034cc68 3051 spin_lock(&sd_index_lock);
f27bac27 3052 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 3053 spin_unlock(&sd_index_lock);
1da177e4
LT		 3054
3055 disk->private_data = NULL;
1da177e4 3056 put_disk(disk);
39b7f1e2 3057 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3058
3059 kfree(sdkp);
3060}
3061
cc5d2c8c 3062static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3063{
3064 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3065 struct scsi_sense_hdr sshdr;
cc5d2c8c 3066 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3067 int res;
3068
3069 if (start)
3070 cmd[4] |= 1; /* START */
3071
d2886ea3
SR		 3072 if (sdp->start_stop_pwr_cond)
3073 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3074
c3c94c5a
TH		 3075 if (!scsi_device_online(sdp))
3076 return -ENODEV;
3077
9b21493c
LM		 3078 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3079 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
c3c94c5a 3080 if (res) {
cc5d2c8c
JB		 3081 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3082 sd_print_result(sdkp, res);
c3c94c5a 3083 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3084 sd_print_sense_hdr(sdkp, &sshdr);
95897910
ON		 3085 if (scsi_sense_valid(&sshdr) &&
3086 /* 0x3a is medium not present */
3087 sshdr.asc == 0x3a)
3088 res = 0;
c3c94c5a
TH		 3089 }
3090
95897910
ON		 3091 /* SCSI error codes must not go to the generic layer */
3092 if (res)
3093 return -EIO;
3094
3095 return 0;
c3c94c5a
TH		 3096}
3097
1da177e4
LT		 3098/*
3099 * Send a SYNCHRONIZE CACHE instruction down to the device through
3100 * the normal SCSI command structure. Wait for the command to
3101 * complete.
3102 */
3103static void sd_shutdown(struct device *dev)
3104{
39b7f1e2 3105 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 3106
3107 if (!sdkp)
3108 return; /* this can happen */
3109
54f57588
LM		 3110 if (pm_runtime_suspended(dev))
3111 goto exit;
3112
95897910 3113 if (sdkp->WCE && sdkp->media_present) {
e73aec82
MP		 3114 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3115 sd_sync_cache(sdkp);
39b7f1e2 3116 }
c3c94c5a 3117
cc5d2c8c
JB		 3118 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3119 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3120 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3121 }
3122
54f57588 3123exit:
39b7f1e2
AS		 3124 scsi_disk_put(sdkp);
3125}
1da177e4 3126
95897910 3127static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
c3c94c5a 3128{
c3c94c5a 3129 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3130 int ret = 0;
c3c94c5a
TH		 3131
3132 if (!sdkp)
3133 return 0; /* this can happen */
3134
95897910 3135 if (sdkp->WCE && sdkp->media_present) {
cc5d2c8c 3136 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a 3137 ret = sd_sync_cache(sdkp);
95897910
ON		 3138 if (ret) {
3139 /* ignore OFFLINE device */
3140 if (ret == -ENODEV)
3141 ret = 0;
09ff92fe 3142 goto done;
95897910 3143 }
c3c94c5a
TH		 3144 }
3145
691e3d31 3146 if (sdkp->device->manage_start_stop) {
cc5d2c8c 3147 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
95897910 3148 /* an error is not worth aborting a system sleep */
cc5d2c8c 3149 ret = sd_start_stop_device(sdkp, 0);
95897910
ON		 3150 if (ignore_stop_errors)
3151 ret = 0;
c3c94c5a
TH		 3152 }
3153
09ff92fe
AS		 3154done:
3155 scsi_disk_put(sdkp);
3156 return ret;
c3c94c5a
TH		 3157}
3158
95897910
ON		 3159static int sd_suspend_system(struct device *dev)
3160{
3161 return sd_suspend_common(dev, true);
3162}
3163
3164static int sd_suspend_runtime(struct device *dev)
3165{
3166 return sd_suspend_common(dev, false);
3167}
3168
c3c94c5a
TH		 3169static int sd_resume(struct device *dev)
3170{
c3c94c5a 3171 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3172 int ret = 0;
c3c94c5a 3173
cc5d2c8c 3174 if (!sdkp->device->manage_start_stop)
09ff92fe 3175 goto done;
c3c94c5a 3176
cc5d2c8c 3177 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 3178 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 3179
09ff92fe
AS		 3180done:
3181 scsi_disk_put(sdkp);
3182 return ret;
c3c94c5a
TH		 3183}
3184
1da177e4
LT		 3185/**
3186 * init_sd - entry point for this driver (both when built in or when
3187 * a module).
3188 *
3189 * Note: this function registers this driver with the scsi mid-level.
3190 **/
3191static int __init init_sd(void)
3192{
5e4009ba 3193 int majors = 0, i, err;
1da177e4
LT		 3194
3195 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3196
0761df9c
HR		 3197 for (i = 0; i < SD_MAJORS; i++) {
3198 if (register_blkdev(sd_major(i), "sd") != 0)
3199 continue;
3200 majors++;
3201 blk_register_region(sd_major(i), SD_MINORS, NULL,
3202 sd_default_probe, NULL, NULL);
3203 }
1da177e4
LT		 3204
3205 if (!majors)
3206 return -ENODEV;
3207
5e4009ba
JG		 3208 err = class_register(&sd_disk_class);
3209 if (err)
3210 goto err_out;
6bdaa1f1 3211
4e7392ec
MP		 3212 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3213 0, 0, NULL);
3214 if (!sd_cdb_cache) {
3215 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3216 goto err_out_class;
3217 }
3218
3219 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3220 if (!sd_cdb_pool) {
3221 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3222 goto err_out_cache;
3223 }
3224
afd5e34b
JD		 3225 err = scsi_register_driver(&sd_template.gendrv);
3226 if (err)
3227 goto err_out_driver;
3228
5e4009ba
JG		 3229 return 0;
3230
afd5e34b
JD		 3231err_out_driver:
3232 mempool_destroy(sd_cdb_pool);
3233
4e7392ec
MP		 3234err_out_cache:
3235 kmem_cache_destroy(sd_cdb_cache);
3236
5e4009ba
JG		 3237err_out_class:
3238 class_unregister(&sd_disk_class);
3239err_out:
3240 for (i = 0; i < SD_MAJORS; i++)
3241 unregister_blkdev(sd_major(i), "sd");
3242 return err;
1da177e4
LT		 3243}
3244
3245/**
3246 * exit_sd - exit point for this driver (when it is a module).
3247 *
3248 * Note: this function unregisters this driver from the scsi mid-level.
3249 **/
3250static void __exit exit_sd(void)
3251{
3252 int i;
3253
3254 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3255
afd5e34b 3256 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3257 mempool_destroy(sd_cdb_pool);
3258 kmem_cache_destroy(sd_cdb_cache);
3259
5e4009ba
JG		 3260 class_unregister(&sd_disk_class);
3261
0761df9c
HR		 3262 for (i = 0; i < SD_MAJORS; i++) {
3263 blk_unregister_region(sd_major(i), SD_MINORS);
1da177e4 3264 unregister_blkdev(sd_major(i), "sd");
0761df9c 3265 }
1da177e4
LT		 3266}
3267
1da177e4
LT		 3268module_init(init_sd);
3269module_exit(exit_sd);
e73aec82
MP		 3270
3271static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3272 struct scsi_sense_hdr *sshdr)
3273{
2e4c3329 3274 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3275 scsi_show_sense_hdr(sshdr);
2e4c3329 3276 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3277 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3278}
3279
3280static void sd_print_result(struct scsi_disk *sdkp, int result)
3281{
2e4c3329 3282 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3283 scsi_show_result(result);
3284}
3285
Linux 6.x block layer and io_uring tree(s)