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Merge tag 'v3.10.107' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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 *);
691e3d31 108static int sd_suspend(struct device *);
7b3d9545
LT		 109static int sd_resume(struct device *);
110static void sd_rescan(struct device *);
111static int sd_done(struct scsi_cmnd *);
18a4d0a2 112static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
7b3d9545 113static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 114static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 115static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116static void sd_print_result(struct scsi_disk *, int);
117
4034cc68 118static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 119static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 120
121/* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
0b950672 124static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 125
439d77f7
HS		 126static struct kmem_cache *sd_cdb_cache;
127static mempool_t *sd_cdb_pool;
4e7392ec 128
6bdaa1f1
JB		 129static const char *sd_cache_types[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
132};
133
ee959b00
TJ		 134static ssize_t
135sd_store_cache_type(struct device *dev, struct device_attribute *attr,
136 const char *buf, size_t count)
6bdaa1f1
JB		 137{
138 int i, ct = -1, rcd, wce, sp;
ee959b00 139 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 140 struct scsi_device *sdp = sdkp->device;
141 char buffer[64];
142 char *buffer_data;
143 struct scsi_mode_data data;
144 struct scsi_sense_hdr sshdr;
312cf3e4 145 static const char temp[] = "temporary ";
6bdaa1f1
JB		 146 int len;
147
148 if (sdp->type != TYPE_DISK)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
152 return -EINVAL;
153
39c60a09
JB		 154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
155 buf += sizeof(temp) - 1;
156 sdkp->cache_override = 1;
157 } else {
158 sdkp->cache_override = 0;
159 }
160
6391a113 161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 162 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 163 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
164 buf[len] == '\n') {
165 ct = i;
166 break;
167 }
168 }
169 if (ct < 0)
170 return -EINVAL;
171 rcd = ct & 0x01 ? 1 : 0;
172 wce = ct & 0x02 ? 1 : 0;
39c60a09
JB		 173
174 if (sdkp->cache_override) {
175 sdkp->WCE = wce;
176 sdkp->RCD = rcd;
177 return count;
178 }
179
6bdaa1f1
JB		 180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
181 SD_MAX_RETRIES, &data, NULL))
182 return -EINVAL;
a9312fb8 183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 184 data.block_descriptor_length);
185 buffer_data = buffer + data.header_length +
186 data.block_descriptor_length;
187 buffer_data[2] &= ~0x05;
188 buffer_data[2] |= wce << 2 | rcd;
189 sp = buffer_data[0] & 0x80 ? 1 : 0;
190
191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
192 SD_MAX_RETRIES, &data, &sshdr)) {
193 if (scsi_sense_valid(&sshdr))
e73aec82 194 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 195 return -EINVAL;
196 }
f98a8cae 197 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 198 return count;
199}
200
ee959b00
TJ		 201static ssize_t
202sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
203 const char *buf, size_t count)
c3c94c5a 204{
ee959b00 205 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 206 struct scsi_device *sdp = sdkp->device;
207
208 if (!capable(CAP_SYS_ADMIN))
209 return -EACCES;
210
211 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
212
213 return count;
214}
215
ee959b00
TJ		 216static ssize_t
217sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
218 const char *buf, size_t count)
a144c5ae 219{
ee959b00 220 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 221 struct scsi_device *sdp = sdkp->device;
222
223 if (!capable(CAP_SYS_ADMIN))
224 return -EACCES;
225
226 if (sdp->type != TYPE_DISK)
227 return -EINVAL;
228
229 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
230
231 return count;
232}
233
ee959b00
TJ		 234static ssize_t
235sd_show_cache_type(struct device *dev, struct device_attribute *attr,
236 char *buf)
6bdaa1f1 237{
ee959b00 238 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 239 int ct = sdkp->RCD + 2*sdkp->WCE;
240
241 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
242}
243
ee959b00
TJ		 244static ssize_t
245sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 246{
ee959b00 247 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 248
249 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
250}
251
ee959b00
TJ		 252static ssize_t
253sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
254 char *buf)
c3c94c5a 255{
ee959b00 256 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 257 struct scsi_device *sdp = sdkp->device;
258
259 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
260}
261
ee959b00
TJ		 262static ssize_t
263sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
264 char *buf)
a144c5ae 265{
ee959b00 266 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 267
268 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
269}
270
e0597d70
MP		 271static ssize_t
272sd_show_protection_type(struct device *dev, struct device_attribute *attr,
273 char *buf)
274{
275 struct scsi_disk *sdkp = to_scsi_disk(dev);
276
277 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
278}
279
8172499a
MP		 280static ssize_t
281sd_store_protection_type(struct device *dev, struct device_attribute *attr,
282 const char *buf, size_t count)
283{
284 struct scsi_disk *sdkp = to_scsi_disk(dev);
285 unsigned int val;
286 int err;
287
288 if (!capable(CAP_SYS_ADMIN))
289 return -EACCES;
290
291 err = kstrtouint(buf, 10, &val);
292
293 if (err)
294 return err;
295
296 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
297 sdkp->protection_type = val;
298
299 return count;
300}
301
518fa8e3
MP		 302static ssize_t
303sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
304 char *buf)
305{
306 struct scsi_disk *sdkp = to_scsi_disk(dev);
307 struct scsi_device *sdp = sdkp->device;
308 unsigned int dif, dix;
309
310 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
311 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
312
313 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
314 dif = 0;
315 dix = 1;
316 }
317
318 if (!dif && !dix)
319 return snprintf(buf, 20, "none\n");
320
321 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
322}
323
e0597d70
MP		 324static ssize_t
325sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
326 char *buf)
327{
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329
330 return snprintf(buf, 20, "%u\n", sdkp->ATO);
331}
332
e339c1a7
MP		 333static ssize_t
334sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
335 char *buf)
336{
337 struct scsi_disk *sdkp = to_scsi_disk(dev);
338
c98a0eb0
MP		 339 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
340}
341
342static const char *lbp_mode[] = {
343 [SD_LBP_FULL] = "full",
344 [SD_LBP_UNMAP] = "unmap",
345 [SD_LBP_WS16] = "writesame_16",
346 [SD_LBP_WS10] = "writesame_10",
347 [SD_LBP_ZERO] = "writesame_zero",
348 [SD_LBP_DISABLE] = "disabled",
349};
350
351static ssize_t
352sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
353 char *buf)
354{
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
358}
359
360static ssize_t
361sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
362 const char *buf, size_t count)
363{
364 struct scsi_disk *sdkp = to_scsi_disk(dev);
365 struct scsi_device *sdp = sdkp->device;
366
367 if (!capable(CAP_SYS_ADMIN))
368 return -EACCES;
369
370 if (sdp->type != TYPE_DISK)
371 return -EINVAL;
372
373 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
374 sd_config_discard(sdkp, SD_LBP_UNMAP);
375 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
376 sd_config_discard(sdkp, SD_LBP_WS16);
377 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
378 sd_config_discard(sdkp, SD_LBP_WS10);
379 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
380 sd_config_discard(sdkp, SD_LBP_ZERO);
381 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
382 sd_config_discard(sdkp, SD_LBP_DISABLE);
383 else
384 return -EINVAL;
385
386 return count;
e339c1a7
MP		 387}
388
18a4d0a2
MP		 389static ssize_t
390sd_show_max_medium_access_timeouts(struct device *dev,
391 struct device_attribute *attr, char *buf)
392{
393 struct scsi_disk *sdkp = to_scsi_disk(dev);
394
395 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
396}
397
398static ssize_t
399sd_store_max_medium_access_timeouts(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
402{
403 struct scsi_disk *sdkp = to_scsi_disk(dev);
404 int err;
405
406 if (!capable(CAP_SYS_ADMIN))
407 return -EACCES;
408
409 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
410
411 return err ? err : count;
412}
413
5db44863
MP		 414static ssize_t
415sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
416 char *buf)
417{
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
421}
422
423static ssize_t
424sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t count)
426{
427 struct scsi_disk *sdkp = to_scsi_disk(dev);
428 struct scsi_device *sdp = sdkp->device;
429 unsigned long max;
430 int err;
431
432 if (!capable(CAP_SYS_ADMIN))
433 return -EACCES;
434
435 if (sdp->type != TYPE_DISK)
436 return -EINVAL;
437
438 err = kstrtoul(buf, 10, &max);
439
440 if (err)
441 return err;
442
443 if (max == 0)
444 sdp->no_write_same = 1;
98dcc294
MP		 445 else if (max <= SD_MAX_WS16_BLOCKS) {
446 sdp->no_write_same = 0;
5db44863 447 sdkp->max_ws_blocks = max;
98dcc294 448 }
5db44863
MP		 449
450 sd_config_write_same(sdkp);
451
452 return count;
453}
454
ee959b00 455static struct device_attribute sd_disk_attrs[] = {
6bdaa1f1
JB		 456 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
457 sd_store_cache_type),
458 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
a144c5ae
BK		 459 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
460 sd_store_allow_restart),
c3c94c5a
TH		 461 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
462 sd_store_manage_start_stop),
8172499a
MP		 463 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
464 sd_store_protection_type),
518fa8e3 465 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
e0597d70 466 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
e339c1a7 467 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
c98a0eb0
MP		 468 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
469 sd_store_provisioning_mode),
5db44863
MP		 470 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
471 sd_show_write_same_blocks, sd_store_write_same_blocks),
18a4d0a2
MP		 472 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
473 sd_show_max_medium_access_timeouts,
474 sd_store_max_medium_access_timeouts),
6bdaa1f1
JB		 475 __ATTR_NULL,
476};
477
478static struct class sd_disk_class = {
479 .name = "scsi_disk",
480 .owner = THIS_MODULE,
ee959b00
TJ		 481 .dev_release = scsi_disk_release,
482 .dev_attrs = sd_disk_attrs,
6bdaa1f1 483};
1da177e4 484
691e3d31
AL		 485static const struct dev_pm_ops sd_pm_ops = {
486 .suspend = sd_suspend,
487 .resume = sd_resume,
488 .poweroff = sd_suspend,
489 .restore = sd_resume,
490 .runtime_suspend = sd_suspend,
491 .runtime_resume = sd_resume,
492};
493
1da177e4
LT		 494static struct scsi_driver sd_template = {
495 .owner = THIS_MODULE,
496 .gendrv = {
497 .name = "sd",
498 .probe = sd_probe,
499 .remove = sd_remove,
500 .shutdown = sd_shutdown,
691e3d31 501 .pm = &sd_pm_ops,
1da177e4
LT		 502 },
503 .rescan = sd_rescan,
7b3d9545 504 .done = sd_done,
18a4d0a2 505 .eh_action = sd_eh_action,
1da177e4
LT		 506};
507
508/*
509 * Device no to disk mapping:
510 *
511 * major disc2 disc p1
512 * |............|.............|....|....| <- dev_t
513 * 31 20 19 8 7 4 3 0
514 *
515 * Inside a major, we have 16k disks, however mapped non-
516 * contiguously. The first 16 disks are for major0, the next
517 * ones with major1, ... Disk 256 is for major0 again, disk 272
518 * for major1, ...
519 * As we stay compatible with our numbering scheme, we can reuse
520 * the well-know SCSI majors 8, 65--71, 136--143.
521 */
522static int sd_major(int major_idx)
523{
524 switch (major_idx) {
525 case 0:
526 return SCSI_DISK0_MAJOR;
527 case 1 ... 7:
528 return SCSI_DISK1_MAJOR + major_idx - 1;
529 case 8 ... 15:
530 return SCSI_DISK8_MAJOR + major_idx - 8;
531 default:
532 BUG();
533 return 0; /* shut up gcc */
534 }
535}
536
39b7f1e2 537static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 538{
539 struct scsi_disk *sdkp = NULL;
540
39b7f1e2
AS		 541 if (disk->private_data) {
542 sdkp = scsi_disk(disk);
543 if (scsi_device_get(sdkp->device) == 0)
ee959b00 544 get_device(&sdkp->dev);
39b7f1e2
AS		 545 else
546 sdkp = NULL;
547 }
548 return sdkp;
549}
550
551static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
552{
553 struct scsi_disk *sdkp;
554
0b950672 555 mutex_lock(&sd_ref_mutex);
39b7f1e2 556 sdkp = __scsi_disk_get(disk);
0b950672 557 mutex_unlock(&sd_ref_mutex);
1da177e4 558 return sdkp;
39b7f1e2 559}
1da177e4 560
39b7f1e2
AS		 561static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
562{
563 struct scsi_disk *sdkp;
564
0b950672 565 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 566 sdkp = dev_get_drvdata(dev);
567 if (sdkp)
568 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 569 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 570 return sdkp;
571}
572
573static void scsi_disk_put(struct scsi_disk *sdkp)
574{
575 struct scsi_device *sdev = sdkp->device;
576
0b950672 577 mutex_lock(&sd_ref_mutex);
ee959b00 578 put_device(&sdkp->dev);
1da177e4 579 scsi_device_put(sdev);
0b950672 580 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 581}
582
35e1a5d9
MP		 583static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
584{
585 unsigned int prot_op = SCSI_PROT_NORMAL;
586 unsigned int dix = scsi_prot_sg_count(scmd);
587
588 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
589 if (dif && dix)
590 prot_op = SCSI_PROT_READ_PASS;
591 else if (dif && !dix)
592 prot_op = SCSI_PROT_READ_STRIP;
593 else if (!dif && dix)
594 prot_op = SCSI_PROT_READ_INSERT;
595 } else {
596 if (dif && dix)
597 prot_op = SCSI_PROT_WRITE_PASS;
598 else if (dif && !dix)
599 prot_op = SCSI_PROT_WRITE_INSERT;
600 else if (!dif && dix)
601 prot_op = SCSI_PROT_WRITE_STRIP;
602 }
603
604 scsi_set_prot_op(scmd, prot_op);
605 scsi_set_prot_type(scmd, dif);
606}
607
c98a0eb0
MP		 608static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
609{
610 struct request_queue *q = sdkp->disk->queue;
611 unsigned int logical_block_size = sdkp->device->sector_size;
612 unsigned int max_blocks = 0;
613
614 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 615 q->limits.discard_alignment = sdkp->unmap_alignment *
616 logical_block_size;
c98a0eb0
MP		 617 q->limits.discard_granularity =
618 max(sdkp->physical_block_size,
619 sdkp->unmap_granularity * logical_block_size);
620
89730393
MP		 621 sdkp->provisioning_mode = mode;
622
c98a0eb0
MP		 623 switch (mode) {
624
625 case SD_LBP_DISABLE:
626 q->limits.max_discard_sectors = 0;
627 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
628 return;
629
630 case SD_LBP_UNMAP:
5db44863
MP		 631 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
632 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 633 break;
634
635 case SD_LBP_WS16:
5db44863
MP		 636 max_blocks = min_not_zero(sdkp->max_ws_blocks,
637 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 638 break;
639
640 case SD_LBP_WS10:
5db44863
MP		 641 max_blocks = min_not_zero(sdkp->max_ws_blocks,
642 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 643 break;
644
645 case SD_LBP_ZERO:
5db44863
MP		 646 max_blocks = min_not_zero(sdkp->max_ws_blocks,
647 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 648 q->limits.discard_zeroes_data = 1;
649 break;
650 }
651
652 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
653 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 654}
655
e339c1a7 656/**
26e85fcd 657 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
66ac0280 658 * @sdp: scsi device to operate one
e339c1a7
MP		 659 * @rq: Request to prepare
660 *
661 * Will issue either UNMAP or WRITE SAME(16) depending on preference
662 * indicated by target device.
663 **/
26e85fcd 664static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 665{
666 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 667 sector_t sector = blk_rq_pos(rq);
668 unsigned int nr_sectors = blk_rq_sectors(rq);
669 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 670 unsigned int len;
f1126e95 671 int ret;
c98a0eb0 672 char *buf;
66ac0280 673 struct page *page;
e339c1a7 674
26e85fcd
MP		 675 sector >>= ilog2(sdp->sector_size) - 9;
676 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7
MP		 677 rq->timeout = SD_TIMEOUT;
678
679 memset(rq->cmd, 0, rq->cmd_len);
680
66ac0280
CH		 681 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
682 if (!page)
683 return BLKPREP_DEFER;
684
c98a0eb0
MP		 685 switch (sdkp->provisioning_mode) {
686 case SD_LBP_UNMAP:
687 buf = page_address(page);
e339c1a7 688
66ac0280 689 rq->cmd_len = 10;
e339c1a7
MP		 690 rq->cmd[0] = UNMAP;
691 rq->cmd[8] = 24;
e339c1a7
MP		 692
693 put_unaligned_be16(6 + 16, &buf[0]);
694 put_unaligned_be16(16, &buf[2]);
695 put_unaligned_be64(sector, &buf[8]);
66ac0280 696 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 697
66ac0280 698 len = 24;
c98a0eb0
MP		 699 break;
700
701 case SD_LBP_WS16:
66ac0280 702 rq->cmd_len = 16;
e339c1a7
MP		 703 rq->cmd[0] = WRITE_SAME_16;
704 rq->cmd[1] = 0x8; /* UNMAP */
705 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 706 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
707
708 len = sdkp->device->sector_size;
c98a0eb0
MP		 709 break;
710
711 case SD_LBP_WS10:
712 case SD_LBP_ZERO:
713 rq->cmd_len = 10;
714 rq->cmd[0] = WRITE_SAME;
715 if (sdkp->provisioning_mode == SD_LBP_WS10)
716 rq->cmd[1] = 0x8; /* UNMAP */
717 put_unaligned_be32(sector, &rq->cmd[2]);
718 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
719
720 len = sdkp->device->sector_size;
721 break;
722
723 default:
09b9cc44 724 ret = BLKPREP_KILL;
c98a0eb0 725 goto out;
e339c1a7
MP		 726 }
727
66ac0280 728 blk_add_request_payload(rq, page, len);
f1126e95
FT		 729 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
730 rq->buffer = page_address(page);
26e85fcd 731 rq->__data_len = nr_bytes;
c98a0eb0
MP		 732
733out:
610a6349
FT		 734 if (ret != BLKPREP_OK) {
735 __free_page(page);
736 rq->buffer = NULL;
737 }
f1126e95
FT		 738 return ret;
739}
740
5db44863
MP		 741static void sd_config_write_same(struct scsi_disk *sdkp)
742{
743 struct request_queue *q = sdkp->disk->queue;
744 unsigned int logical_block_size = sdkp->device->sector_size;
5db44863
MP		 745
746 if (sdkp->device->no_write_same) {
747 sdkp->max_ws_blocks = 0;
748 goto out;
749 }
750
751 /* Some devices can not handle block counts above 0xffff despite
752 * supporting WRITE SAME(16). Consequently we default to 64k
753 * blocks per I/O unless the device explicitly advertises a
754 * bigger limit.
755 */
98dcc294
MP		 756 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
757 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
758 (u32)SD_MAX_WS16_BLOCKS);
759 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
760 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
761 (u32)SD_MAX_WS10_BLOCKS);
762 else {
763 sdkp->device->no_write_same = 1;
764 sdkp->max_ws_blocks = 0;
765 }
5db44863
MP		 766
767out:
98dcc294
MP		 768 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
769 (logical_block_size >> 9));
5db44863
MP		 770}
771
772/**
773 * sd_setup_write_same_cmnd - write the same data to multiple blocks
774 * @sdp: scsi device to operate one
775 * @rq: Request to prepare
776 *
777 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
778 * preference indicated by target device.
779 **/
780static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
781{
782 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
783 struct bio *bio = rq->bio;
784 sector_t sector = blk_rq_pos(rq);
785 unsigned int nr_sectors = blk_rq_sectors(rq);
786 unsigned int nr_bytes = blk_rq_bytes(rq);
787 int ret;
788
789 if (sdkp->device->no_write_same)
790 return BLKPREP_KILL;
791
792 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
793
794 sector >>= ilog2(sdp->sector_size) - 9;
795 nr_sectors >>= ilog2(sdp->sector_size) - 9;
796
797 rq->__data_len = sdp->sector_size;
798 rq->timeout = SD_WRITE_SAME_TIMEOUT;
799 memset(rq->cmd, 0, rq->cmd_len);
800
801 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
802 rq->cmd_len = 16;
803 rq->cmd[0] = WRITE_SAME_16;
804 put_unaligned_be64(sector, &rq->cmd[2]);
805 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
806 } else {
807 rq->cmd_len = 10;
808 rq->cmd[0] = WRITE_SAME;
809 put_unaligned_be32(sector, &rq->cmd[2]);
810 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
811 }
812
813 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
814 rq->__data_len = nr_bytes;
815
816 return ret;
817}
818
90467c29
FT		 819static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
820{
e3b3e624 821 rq->timeout = SD_FLUSH_TIMEOUT;
90467c29
FT		 822 rq->retries = SD_MAX_RETRIES;
823 rq->cmd[0] = SYNCHRONIZE_CACHE;
824 rq->cmd_len = 10;
825
826 return scsi_setup_blk_pc_cmnd(sdp, rq);
827}
828
f1126e95
FT		 829static void sd_unprep_fn(struct request_queue *q, struct request *rq)
830{
8cf7b0b0
EM		 831 struct scsi_cmnd *SCpnt = rq->special;
832
610a6349
FT		 833 if (rq->cmd_flags & REQ_DISCARD) {
834 free_page((unsigned long)rq->buffer);
835 rq->buffer = NULL;
836 }
8cf7b0b0
EM		 837 if (SCpnt->cmnd != rq->cmd) {
838 mempool_free(SCpnt->cmnd, sd_cdb_pool);
839 SCpnt->cmnd = NULL;
840 SCpnt->cmd_len = 0;
841 }
e339c1a7
MP		 842}
843
1da177e4 844/**
2db93ce8 845 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 846 * information in the request structure.
847 * @SCpnt: pointer to mid-level's per scsi command structure that
848 * contains request and into which the scsi command is written
849 *
850 * Returns 1 if successful and 0 if error (or cannot be done now).
851 **/
7f9a6bc4 852static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 853{
7f9a6bc4
JB		 854 struct scsi_cmnd *SCpnt;
855 struct scsi_device *sdp = q->queuedata;
776b23a0 856 struct gendisk *disk = rq->rq_disk;
af55ff67 857 struct scsi_disk *sdkp;
83096ebf 858 sector_t block = blk_rq_pos(rq);
18351070 859 sector_t threshold;
83096ebf 860 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 861 int ret, host_dif;
4e7392ec 862 unsigned char protect;
7f9a6bc4 863
e339c1a7
MP		 864 /*
865 * Discard request come in as REQ_TYPE_FS but we turn them into
866 * block PC requests to make life easier.
867 */
66ac0280 868 if (rq->cmd_flags & REQ_DISCARD) {
26e85fcd 869 ret = sd_setup_discard_cmnd(sdp, rq);
66ac0280 870 goto out;
5db44863
MP		 871 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
872 ret = sd_setup_write_same_cmnd(sdp, rq);
873 goto out;
90467c29
FT		 874 } else if (rq->cmd_flags & REQ_FLUSH) {
875 ret = scsi_setup_flush_cmnd(sdp, rq);
876 goto out;
66ac0280 877 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 878 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
879 goto out;
880 } else if (rq->cmd_type != REQ_TYPE_FS) {
881 ret = BLKPREP_KILL;
882 goto out;
883 }
884 ret = scsi_setup_fs_cmnd(sdp, rq);
885 if (ret != BLKPREP_OK)
886 goto out;
887 SCpnt = rq->special;
af55ff67 888 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 889
890 /* from here on until we're complete, any goto out
891 * is used for a killable error condition */
892 ret = BLKPREP_KILL;
1da177e4 893
fa0d34be 894 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 895 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 896 "count=%d\n",
897 (unsigned long long)block,
898 this_count));
1da177e4
LT		 899
900 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 901 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 902 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 903 "Finishing %u sectors\n",
904 blk_rq_sectors(rq)));
fa0d34be
MP		 905 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
906 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 907 goto out;
1da177e4
LT		 908 }
909
910 if (sdp->changed) {
911 /*
912 * quietly refuse to do anything to a changed disc until
913 * the changed bit has been reset
914 */
3ff5588d 915 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 916 goto out;
1da177e4 917 }
7f9a6bc4 918
a0899d4d 919 /*
18351070
LT		 920 * Some SD card readers can't handle multi-sector accesses which touch
921 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 922 */
18351070
LT		 923 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
924 (sdp->sector_size / 512);
925
926 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
927 if (block < threshold) {
928 /* Access up to the threshold but not beyond */
929 this_count = threshold - block;
930 } else {
931 /* Access only a single hardware sector */
932 this_count = sdp->sector_size / 512;
933 }
934 }
a0899d4d 935
fa0d34be
MP		 936 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
937 (unsigned long long)block));
1da177e4
LT		 938
939 /*
940 * If we have a 1K hardware sectorsize, prevent access to single
941 * 512 byte sectors. In theory we could handle this - in fact
942 * the scsi cdrom driver must be able to handle this because
943 * we typically use 1K blocksizes, and cdroms typically have
944 * 2K hardware sectorsizes. Of course, things are simpler
945 * with the cdrom, since it is read-only. For performance
946 * reasons, the filesystems should be able to handle this
947 * and not force the scsi disk driver to use bounce buffers
948 * for this.
949 */
950 if (sdp->sector_size == 1024) {
83096ebf 951 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 952 scmd_printk(KERN_ERR, SCpnt,
953 "Bad block number requested\n");
7f9a6bc4 954 goto out;
1da177e4
LT		 955 } else {
956 block = block >> 1;
957 this_count = this_count >> 1;
958 }
959 }
960 if (sdp->sector_size == 2048) {
83096ebf 961 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 962 scmd_printk(KERN_ERR, SCpnt,
963 "Bad block number requested\n");
7f9a6bc4 964 goto out;
1da177e4
LT		 965 } else {
966 block = block >> 2;
967 this_count = this_count >> 2;
968 }
969 }
970 if (sdp->sector_size == 4096) {
83096ebf 971 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 972 scmd_printk(KERN_ERR, SCpnt,
973 "Bad block number requested\n");
7f9a6bc4 974 goto out;
1da177e4
LT		 975 } else {
976 block = block >> 3;
977 this_count = this_count >> 3;
978 }
979 }
980 if (rq_data_dir(rq) == WRITE) {
981 if (!sdp->writeable) {
7f9a6bc4 982 goto out;
1da177e4
LT		 983 }
984 SCpnt->cmnd[0] = WRITE_6;
985 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 986
8c579ab6
MP		 987 if (blk_integrity_rq(rq))
988 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 989
1da177e4
LT		 990 } else if (rq_data_dir(rq) == READ) {
991 SCpnt->cmnd[0] = READ_6;
992 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
993 } else {
e73aec82 994 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
7f9a6bc4 995 goto out;
1da177e4
LT		 996 }
997
fa0d34be 998 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 999 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 1000 (rq_data_dir(rq) == WRITE) ?
1001 "writing" : "reading", this_count,
83096ebf 1002 blk_rq_sectors(rq)));
1da177e4 1003
af55ff67 1004 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 1005 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1006 if (host_dif)
4e7392ec 1007 protect = 1 << 5;
af55ff67 1008 else
4e7392ec
MP		 1009 protect = 0;
1010
1011 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1012 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1013
1014 if (unlikely(SCpnt->cmnd == NULL)) {
1015 ret = BLKPREP_DEFER;
1016 goto out;
1017 }
af55ff67 1018
4e7392ec
MP		 1019 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1020 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1021 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1022 SCpnt->cmnd[7] = 0x18;
1023 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 1024 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 1025
1026 /* LBA */
1027 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1028 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1029 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1030 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1031 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1032 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1033 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1034 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1035
1036 /* Expected Indirect LBA */
1037 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1038 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1039 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1040 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1041
1042 /* Transfer length */
1043 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1044 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1045 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1046 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
53ad570b 1047 } else if (sdp->use_16_for_rw) {
1da177e4 1048 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1049 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1050 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1051 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1052 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1053 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1054 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1055 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1056 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1057 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1058 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1059 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1060 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1061 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1062 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1063 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1064 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 1065 SCpnt->device->use_10_for_rw) {
1066 if (this_count > 0xffff)
1067 this_count = 0xffff;
1068
1069 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1070 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1071 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1072 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1073 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1074 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1075 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1076 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1077 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1078 } else {
33659ebb 1079 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1080 /*
1081 * This happens only if this drive failed
1082 * 10byte rw command with ILLEGAL_REQUEST
1083 * during operation and thus turned off
1084 * use_10_for_rw.
1085 */
e73aec82
MP		 1086 scmd_printk(KERN_ERR, SCpnt,
1087 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1088 goto out;
007365ad
TH		 1089 }
1090
1da177e4
LT		 1091 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1092 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1093 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1094 SCpnt->cmnd[4] = (unsigned char) this_count;
1095 SCpnt->cmnd[5] = 0;
1096 }
30b0c37b 1097 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 1098
af55ff67 1099 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 1100 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 1101 sd_prot_op(SCpnt, host_dif);
af55ff67 1102
1da177e4
LT		 1103 /*
1104 * We shouldn't disconnect in the middle of a sector, so with a dumb
1105 * host adapter, it's safe to assume that we can at least transfer
1106 * this many bytes between each connect / disconnect.
1107 */
1108 SCpnt->transfersize = sdp->sector_size;
1109 SCpnt->underflow = this_count << 9;
1110 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1111
1da177e4
LT		 1112 /*
1113 * This indicates that the command is ready from our end to be
1114 * queued.
1115 */
7f9a6bc4
JB		 1116 ret = BLKPREP_OK;
1117 out:
1118 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 1119}
1120
1121/**
1122 * sd_open - open a scsi disk device
1123 * @inode: only i_rdev member may be used
1124 * @filp: only f_mode and f_flags may be used
1125 *
1126 * Returns 0 if successful. Returns a negated errno value in case
1127 * of error.
1128 *
1129 * Note: This can be called from a user context (e.g. fsck(1) )
1130 * or from within the kernel (e.g. as a result of a mount(1) ).
1131 * In the latter case @inode and @filp carry an abridged amount
1132 * of information as noted above.
409f3499
AB		 1133 *
1134 * Locking: called with bdev->bd_mutex held.
1da177e4 1135 **/
0338e291 1136static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1137{
0338e291 1138 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1139 struct scsi_device *sdev;
1140 int retval;
1141
0338e291 1142 if (!sdkp)
1da177e4
LT		 1143 return -ENXIO;
1144
fa0d34be 1145 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1146
1147 sdev = sdkp->device;
1148
1149 /*
1150 * If the device is in error recovery, wait until it is done.
1151 * If the device is offline, then disallow any access to it.
1152 */
1153 retval = -ENXIO;
1154 if (!scsi_block_when_processing_errors(sdev))
1155 goto error_out;
1156
1157 if (sdev->removable || sdkp->write_prot)
0338e291 1158 check_disk_change(bdev);
1da177e4
LT		 1159
1160 /*
1161 * If the drive is empty, just let the open fail.
1162 */
1163 retval = -ENOMEDIUM;
0338e291 1164 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1165 goto error_out;
1166
1167 /*
1168 * If the device has the write protect tab set, have the open fail
1169 * if the user expects to be able to write to the thing.
1170 */
1171 retval = -EROFS;
0338e291 1172 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1173 goto error_out;
1174
1175 /*
1176 * It is possible that the disk changing stuff resulted in
1177 * the device being taken offline. If this is the case,
1178 * report this to the user, and don't pretend that the
1179 * open actually succeeded.
1180 */
1181 retval = -ENXIO;
1182 if (!scsi_device_online(sdev))
1183 goto error_out;
1184
409f3499 1185 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1186 if (scsi_block_when_processing_errors(sdev))
1187 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1188 }
1189
1190 return 0;
1191
1192error_out:
1193 scsi_disk_put(sdkp);
1194 return retval;
1195}
1196
1197/**
1198 * sd_release - invoked when the (last) close(2) is called on this
1199 * scsi disk.
1200 * @inode: only i_rdev member may be used
1201 * @filp: only f_mode and f_flags may be used
1202 *
1203 * Returns 0.
1204 *
1205 * Note: may block (uninterruptible) if error recovery is underway
1206 * on this disk.
409f3499
AB		 1207 *
1208 * Locking: called with bdev->bd_mutex held.
1da177e4 1209 **/
db2a144b 1210static void sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1211{
1da177e4
LT		 1212 struct scsi_disk *sdkp = scsi_disk(disk);
1213 struct scsi_device *sdev = sdkp->device;
1214
56937f7b 1215 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1216
7e443312 1217 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1218 if (scsi_block_when_processing_errors(sdev))
1219 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1220 }
1221
1222 /*
1223 * XXX and what if there are packets in flight and this close()
1224 * XXX is followed by a "rmmod sd_mod"?
1225 */
478a8a05 1226
1da177e4 1227 scsi_disk_put(sdkp);
1da177e4
LT		 1228}
1229
a885c8c4 1230static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1231{
1232 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1233 struct scsi_device *sdp = sdkp->device;
1234 struct Scsi_Host *host = sdp->host;
1235 int diskinfo[4];
1236
1237 /* default to most commonly used values */
1238 diskinfo[0] = 0x40; /* 1 << 6 */
1239 diskinfo[1] = 0x20; /* 1 << 5 */
1240 diskinfo[2] = sdkp->capacity >> 11;
1241
1242 /* override with calculated, extended default, or driver values */
1243 if (host->hostt->bios_param)
1244 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1245 else
1246 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1247
a885c8c4
CH		 1248 geo->heads = diskinfo[0];
1249 geo->sectors = diskinfo[1];
1250 geo->cylinders = diskinfo[2];
1da177e4
LT		 1251 return 0;
1252}
1253
1254/**
1255 * sd_ioctl - process an ioctl
1256 * @inode: only i_rdev/i_bdev members may be used
1257 * @filp: only f_mode and f_flags may be used
1258 * @cmd: ioctl command number
1259 * @arg: this is third argument given to ioctl(2) system call.
1260 * Often contains a pointer.
1261 *
25985edc 1262 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1263 * success as well). Returns a negated errno value in case of error.
1264 *
1265 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1266 * down in the scsi subsystem.
1da177e4 1267 **/
0338e291 1268static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1269 unsigned int cmd, unsigned long arg)
1270{
1da177e4 1271 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1272 struct scsi_disk *sdkp = scsi_disk(disk);
1273 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1274 void __user *p = (void __user *)arg;
1275 int error;
1276
fe2d1851
NN		 1277 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1278 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1279
0bfc96cb
PB		 1280 error = scsi_verify_blk_ioctl(bdev, cmd);
1281 if (error < 0)
1282 return error;
1283
1da177e4
LT		 1284 /*
1285 * If we are in the middle of error recovery, don't let anyone
1286 * else try and use this device. Also, if error recovery fails, it
1287 * may try and take the device offline, in which case all further
1288 * access to the device is prohibited.
1289 */
83ff6fe8 1290 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1291 (mode & FMODE_NDELAY) != 0);
1da177e4 1292 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1293 goto out;
1da177e4 1294
1da177e4
LT		 1295 /*
1296 * Send SCSI addressing ioctls directly to mid level, send other
1297 * ioctls to block level and then onto mid level if they can't be
1298 * resolved.
1299 */
1300 switch (cmd) {
1301 case SCSI_IOCTL_GET_IDLUN:
1302 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1303 error = scsi_ioctl(sdp, cmd, p);
1304 break;
1da177e4 1305 default:
577ebb37 1306 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1307 if (error != -ENOTTY)
8a6cfeb6
AB		 1308 break;
1309 error = scsi_ioctl(sdp, cmd, p);
1310 break;
1da177e4 1311 }
8a6cfeb6 1312out:
8a6cfeb6 1313 return error;
1da177e4
LT		 1314}
1315
1316static void set_media_not_present(struct scsi_disk *sdkp)
1317{
2bae0093
TH		 1318 if (sdkp->media_present)
1319 sdkp->device->changed = 1;
1320
1321 if (sdkp->device->removable) {
1322 sdkp->media_present = 0;
1323 sdkp->capacity = 0;
1324 }
1325}
1326
1327static int media_not_present(struct scsi_disk *sdkp,
1328 struct scsi_sense_hdr *sshdr)
1329{
1330 if (!scsi_sense_valid(sshdr))
1331 return 0;
1332
1333 /* not invoked for commands that could return deferred errors */
1334 switch (sshdr->sense_key) {
1335 case UNIT_ATTENTION:
1336 case NOT_READY:
1337 /* medium not present */
1338 if (sshdr->asc == 0x3A) {
1339 set_media_not_present(sdkp);
1340 return 1;
1341 }
1342 }
1343 return 0;
1da177e4
LT		 1344}
1345
1346/**
2bae0093
TH		 1347 * sd_check_events - check media events
1348 * @disk: kernel device descriptor
1349 * @clearing: disk events currently being cleared
1da177e4 1350 *
2bae0093 1351 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1352 *
1353 * Note: this function is invoked from the block subsystem.
1354 **/
2bae0093 1355static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4 1356{
1ba4fc4b
HR		 1357 struct scsi_disk *sdkp = scsi_disk_get(disk);
1358 struct scsi_device *sdp;
001aac25 1359 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1360 int retval;
1361
1ba4fc4b
HR		 1362 if (!sdkp)
1363 return 0;
1364
1365 sdp = sdkp->device;
2bae0093 1366 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1367
1368 /*
1369 * If the device is offline, don't send any commands - just pretend as
1370 * if the command failed. If the device ever comes back online, we
1371 * can deal with it then. It is only because of unrecoverable errors
1372 * that we would ever take a device offline in the first place.
1373 */
285e9670
KS		 1374 if (!scsi_device_online(sdp)) {
1375 set_media_not_present(sdkp);
285e9670
KS		 1376 goto out;
1377 }
1da177e4
LT		 1378
1379 /*
1380 * Using TEST_UNIT_READY enables differentiation between drive with
1381 * no cartridge loaded - NOT READY, drive with changed cartridge -
1382 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1383 *
1384 * Drives that auto spin down. eg iomega jaz 1G, will be started
1385 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1386 * sd_revalidate() is called.
1387 */
1388 retval = -ENODEV;
285e9670 1389
001aac25
JB		 1390 if (scsi_block_when_processing_errors(sdp)) {
1391 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1392 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1393 sshdr);
1394 }
1da177e4 1395
2bae0093
TH		 1396 /* failed to execute TUR, assume media not present */
1397 if (host_byte(retval)) {
285e9670 1398 set_media_not_present(sdkp);
285e9670
KS		 1399 goto out;
1400 }
1da177e4 1401
2bae0093
TH		 1402 if (media_not_present(sdkp, sshdr))
1403 goto out;
1404
1da177e4
LT		 1405 /*
1406 * For removable scsi disk we have to recognise the presence
2bae0093 1407 * of a disk in the drive.
1da177e4 1408 */
2bae0093
TH		 1409 if (!sdkp->media_present)
1410 sdp->changed = 1;
1da177e4 1411 sdkp->media_present = 1;
285e9670 1412out:
3ff5588d 1413 /*
2bae0093 1414 * sdp->changed is set under the following conditions:
3ff5588d 1415 *
2bae0093
TH		 1416 * Medium present state has changed in either direction.
1417 * Device has indicated UNIT_ATTENTION.
3ff5588d 1418 */
001aac25 1419 kfree(sshdr);
2bae0093 1420 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
6fa3eb70
S		 1421#ifdef CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT
1422 //add for sdcard hotplug start
1423 if(1 == retval){
1424 if(sdkp->old_media_present != sdkp->media_present){
1425 retval |= sdkp->media_present ? 0 : DISK_EVENT_MEDIA_DISAPPEAR;
1426 sdkp->old_media_present = sdkp->media_present;
1427 }
1428 }
1429 //add for sdcard hotplug end
1430#endif
2bae0093 1431 sdp->changed = 0;
1ba4fc4b 1432 scsi_disk_put(sdkp);
1da177e4 1433 return retval;
1da177e4
LT		 1434}
1435
e73aec82 1436static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1437{
1da177e4 1438 int retries, res;
e73aec82 1439 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1440 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1441
1442 if (!scsi_device_online(sdp))
1443 return -ENODEV;
1444
1da177e4 1445
1da177e4
LT		 1446 for (retries = 3; retries > 0; --retries) {
1447 unsigned char cmd[10] = { 0 };
1448
1449 cmd[0] = SYNCHRONIZE_CACHE;
1450 /*
1451 * Leave the rest of the command zero to indicate
1452 * flush everything.
1453 */
9b21493c
LM		 1454 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1455 &sshdr, SD_FLUSH_TIMEOUT,
1456 SD_MAX_RETRIES, NULL, REQ_PM);
ea73a9f2 1457 if (res == 0)
1da177e4
LT		 1458 break;
1459 }
1460
e73aec82
MP		 1461 if (res) {
1462 sd_print_result(sdkp, res);
1463 if (driver_byte(res) & DRIVER_SENSE)
1464 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1465 }
1466
3721050a
TH		 1467 if (res)
1468 return -EIO;
1469 return 0;
1da177e4
LT		 1470}
1471
1da177e4
LT		 1472static void sd_rescan(struct device *dev)
1473{
39b7f1e2
AS		 1474 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1475
1476 if (sdkp) {
f98a8cae 1477 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1478 scsi_disk_put(sdkp);
1479 }
1da177e4
LT		 1480}
1481
1482
1483#ifdef CONFIG_COMPAT
1484/*
1485 * This gets directly called from VFS. When the ioctl
1486 * is not recognized we go back to the other translation paths.
1487 */
0338e291
AV		 1488static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1489 unsigned int cmd, unsigned long arg)
1da177e4 1490{
0338e291 1491 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1492 int ret;
1493
1494 ret = scsi_verify_blk_ioctl(bdev, cmd);
1495 if (ret < 0)
1496 return ret;
1da177e4
LT		 1497
1498 /*
1499 * If we are in the middle of error recovery, don't let anyone
1500 * else try and use this device. Also, if error recovery fails, it
1501 * may try and take the device offline, in which case all further
1502 * access to the device is prohibited.
1503 */
1504 if (!scsi_block_when_processing_errors(sdev))
1505 return -ENODEV;
1506
1507 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1508 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1509
1510 return ret;
1511 }
1512
1513 /*
1514 * Let the static ioctl translation table take care of it.
1515 */
1516 return -ENOIOCTLCMD;
1517}
1518#endif
1519
83d5cde4 1520static const struct block_device_operations sd_fops = {
1da177e4 1521 .owner = THIS_MODULE,
0338e291
AV		 1522 .open = sd_open,
1523 .release = sd_release,
8a6cfeb6 1524 .ioctl = sd_ioctl,
a885c8c4 1525 .getgeo = sd_getgeo,
1da177e4 1526#ifdef CONFIG_COMPAT
0338e291 1527 .compat_ioctl = sd_compat_ioctl,
1da177e4 1528#endif
2bae0093 1529 .check_events = sd_check_events,
1da177e4 1530 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1531 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1532};
1533
18a4d0a2
MP		 1534/**
1535 * sd_eh_action - error handling callback
1536 * @scmd: sd-issued command that has failed
1537 * @eh_cmnd: The command that was sent during error handling
1538 * @eh_cmnd_len: Length of eh_cmnd in bytes
1539 * @eh_disp: The recovery disposition suggested by the midlayer
1540 *
1541 * This function is called by the SCSI midlayer upon completion of
1542 * an error handling command (TEST UNIT READY, START STOP UNIT,
1543 * etc.) The command sent to the device by the error handler is
1544 * stored in eh_cmnd. The result of sending the eh command is
1545 * passed in eh_disp.
1546 **/
1547static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1548 int eh_cmnd_len, int eh_disp)
1549{
1550 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1551
1552 if (!scsi_device_online(scmd->device) ||
1553 !scsi_medium_access_command(scmd))
1554 return eh_disp;
1555
1556 /*
1557 * The device has timed out executing a medium access command.
1558 * However, the TEST UNIT READY command sent during error
1559 * handling completed successfully. Either the device is in the
1560 * process of recovering or has it suffered an internal failure
1561 * that prevents access to the storage medium.
1562 */
1563 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1564 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1565 sdkp->medium_access_timed_out++;
1566
1567 /*
1568 * If the device keeps failing read/write commands but TEST UNIT
1569 * READY always completes successfully we assume that medium
1570 * access is no longer possible and take the device offline.
1571 */
1572 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1573 scmd_printk(KERN_ERR, scmd,
1574 "Medium access timeout failure. Offlining disk!\n");
1575 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1576
1577 return FAILED;
1578 }
1579
1580 return eh_disp;
1581}
1582
af55ff67
MP		 1583static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1584{
83096ebf
TH		 1585 u64 start_lba = blk_rq_pos(scmd->request);
1586 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1587 u64 bad_lba;
1588 int info_valid;
a8733c7b
JB		 1589 /*
1590 * resid is optional but mostly filled in. When it's unused,
1591 * its value is zero, so we assume the whole buffer transferred
1592 */
1593 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1594 unsigned int good_bytes;
af55ff67 1595
33659ebb 1596 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1597 return 0;
1598
1599 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1600 SCSI_SENSE_BUFFERSIZE,
1601 &bad_lba);
1602 if (!info_valid)
1603 return 0;
1604
1605 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1606 return 0;
1607
1608 if (scmd->device->sector_size < 512) {
1609 /* only legitimate sector_size here is 256 */
1610 start_lba <<= 1;
1611 end_lba <<= 1;
1612 } else {
1613 /* be careful ... don't want any overflows */
1614 u64 factor = scmd->device->sector_size / 512;
1615 do_div(start_lba, factor);
1616 do_div(end_lba, factor);
1617 }
1618
1619 /* The bad lba was reported incorrectly, we have no idea where
1620 * the error is.
1621 */
1622 if (bad_lba < start_lba || bad_lba >= end_lba)
1623 return 0;
1624
1625 /* This computation should always be done in terms of
1626 * the resolution of the device's medium.
1627 */
a8733c7b
JB		 1628 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1629 return min(good_bytes, transferred);
af55ff67
MP		 1630}
1631
1da177e4 1632/**
7b3d9545 1633 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1634 * driver has completed (successfully or otherwise) a scsi command.
1635 * @SCpnt: mid-level's per command structure.
1636 *
1637 * Note: potentially run from within an ISR. Must not block.
1638 **/
7b3d9545 1639static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1640{
1641 int result = SCpnt->result;
af55ff67 1642 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1643 struct scsi_sense_hdr sshdr;
4e7392ec 1644 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1645 struct request *req = SCpnt->request;
1da177e4
LT		 1646 int sense_valid = 0;
1647 int sense_deferred = 0;
c98a0eb0 1648 unsigned char op = SCpnt->cmnd[0];
5db44863 1649 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1650
5db44863 1651 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1652 if (!result) {
1653 good_bytes = blk_rq_bytes(req);
1654 scsi_set_resid(SCpnt, 0);
1655 } else {
1656 good_bytes = 0;
1657 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1658 }
1659 }
6a32a8ae 1660
1da177e4
LT		 1661 if (result) {
1662 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1663 if (sense_valid)
1664 sense_deferred = scsi_sense_is_deferred(&sshdr);
1665 }
1da177e4 1666#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1667 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1668 if (sense_valid) {
fa0d34be 1669 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1670 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1671 "ascq]=%x,%x,%x,%x\n",
1672 sshdr.response_code,
1673 sshdr.sense_key, sshdr.asc,
1674 sshdr.ascq));
1da177e4
LT		 1675 }
1676#endif
03aba2f7
LT		 1677 if (driver_byte(result) != DRIVER_SENSE &&
1678 (!sense_valid || sense_deferred))
1679 goto out;
1680
18a4d0a2
MP		 1681 sdkp->medium_access_timed_out = 0;
1682
03aba2f7
LT		 1683 switch (sshdr.sense_key) {
1684 case HARDWARE_ERROR:
1685 case MEDIUM_ERROR:
af55ff67 1686 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1687 break;
1688 case RECOVERED_ERROR:
af55ff67
MP		 1689 good_bytes = scsi_bufflen(SCpnt);
1690 break;
10dab226
JW		 1691 case NO_SENSE:
1692 /* This indicates a false check condition, so ignore it. An
1693 * unknown amount of data was transferred so treat it as an
1694 * error.
1695 */
1696 scsi_print_sense("sd", SCpnt);
1697 SCpnt->result = 0;
1698 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1699 break;
c98a0eb0
MP		 1700 case ABORTED_COMMAND:
1701 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1702 good_bytes = sd_completed_bytes(SCpnt);
1703 break;
1704 case ILLEGAL_REQUEST:
1705 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1706 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1707 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1708 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1709 switch (op) {
1710 case UNMAP:
1711 sd_config_discard(sdkp, SD_LBP_DISABLE);
1712 break;
1713 case WRITE_SAME_16:
1714 case WRITE_SAME:
1715 if (unmap)
1716 sd_config_discard(sdkp, SD_LBP_DISABLE);
1717 else {
1718 sdkp->device->no_write_same = 1;
1719 sd_config_write_same(sdkp);
1720
1721 good_bytes = 0;
1722 req->__data_len = blk_rq_bytes(req);
1723 req->cmd_flags |= REQ_QUIET;
1724 }
1725 }
1726 }
03aba2f7
LT		 1727 break;
1728 default:
1729 break;
1da177e4 1730 }
03aba2f7 1731 out:
af55ff67
MP		 1732 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1733 sd_dif_complete(SCpnt, good_bytes);
1734
7b3d9545 1735 return good_bytes;
1da177e4
LT		 1736}
1737
1da177e4
LT		 1738/*
1739 * spinup disk - called only in sd_revalidate_disk()
1740 */
1741static void
e73aec82 1742sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1743{
1da177e4 1744 unsigned char cmd[10];
4451e472 1745 unsigned long spintime_expire = 0;
1da177e4
LT		 1746 int retries, spintime;
1747 unsigned int the_result;
1748 struct scsi_sense_hdr sshdr;
1749 int sense_valid = 0;
1750
1751 spintime = 0;
1752
1753 /* Spin up drives, as required. Only do this at boot time */
1754 /* Spinup needs to be done for module loads too. */
1755 do {
1756 retries = 0;
1757
1758 do {
1759 cmd[0] = TEST_UNIT_READY;
1760 memset((void *) &cmd[1], 0, 9);
1761
ea73a9f2
JB		 1762 the_result = scsi_execute_req(sdkp->device, cmd,
1763 DMA_NONE, NULL, 0,
1764 &sshdr, SD_TIMEOUT,
f4f4e47e 1765 SD_MAX_RETRIES, NULL);
1da177e4 1766
b4d38e38
AS		 1767 /*
1768 * If the drive has indicated to us that it
1769 * doesn't have any media in it, don't bother
1770 * with any more polling.
1771 */
6fa3eb70 1772 /*
b4d38e38
AS		 1773 if (media_not_present(sdkp, &sshdr))
1774 return;
6fa3eb70 1775 */
b4d38e38 1776
1da177e4 1777 if (the_result)
ea73a9f2 1778 sense_valid = scsi_sense_valid(&sshdr);
1da177e4 1779 retries++;
6fa3eb70 1780 if(!scsi_status_is_good(the_result) ||
1da177e4 1781 ((driver_byte(the_result) & DRIVER_SENSE) &&
6fa3eb70
S		 1782 sense_valid && sshdr.sense_key == UNIT_ATTENTION)) {
1783 msleep(100);
1784 } else {
1785 break;
1786 }
1787 } while (retries < 5);
1da177e4 1788
1da177e4
LT		 1789 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1790 /* no sense, TUR either succeeded or failed
1791 * with a status error */
e73aec82
MP		 1792 if(!spintime && !scsi_status_is_good(the_result)) {
1793 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1794 sd_print_result(sdkp, the_result);
1795 }
1da177e4
LT		 1796 break;
1797 }
1798
1799 /*
1800 * The device does not want the automatic start to be issued.
1801 */
33dd6f92 1802 if (sdkp->device->no_start_on_add)
1da177e4 1803 break;
1da177e4 1804
33dd6f92
MW		 1805 if (sense_valid && sshdr.sense_key == NOT_READY) {
1806 if (sshdr.asc == 4 && sshdr.ascq == 3)
1807 break; /* manual intervention required */
1808 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1809 break; /* standby */
1810 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1811 break; /* unavailable */
1812 /*
1813 * Issue command to spin up drive when not ready
1814 */
1da177e4 1815 if (!spintime) {
e73aec82 1816 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1817 cmd[0] = START_STOP;
1818 cmd[1] = 1; /* Return immediately */
1819 memset((void *) &cmd[2], 0, 8);
1820 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1821 if (sdkp->device->start_stop_pwr_cond)
1822 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1823 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1824 NULL, 0, &sshdr,
f4f4e47e
FT		 1825 SD_TIMEOUT, SD_MAX_RETRIES,
1826 NULL);
4451e472
AS		 1827 spintime_expire = jiffies + 100 * HZ;
1828 spintime = 1;
1da177e4 1829 }
1da177e4
LT		 1830 /* Wait 1 second for next try */
1831 msleep(1000);
1832 printk(".");
4451e472
AS		 1833
1834 /*
1835 * Wait for USB flash devices with slow firmware.
1836 * Yes, this sense key/ASC combination shouldn't
1837 * occur here. It's characteristic of these devices.
1838 */
1839 } else if (sense_valid &&
1840 sshdr.sense_key == UNIT_ATTENTION &&
1841 sshdr.asc == 0x28) {
1842 if (!spintime) {
1843 spintime_expire = jiffies + 5 * HZ;
1844 spintime = 1;
1845 }
1846 /* Wait 1 second for next try */
1847 msleep(1000);
1da177e4
LT		 1848 } else {
1849 /* we don't understand the sense code, so it's
1850 * probably pointless to loop */
1851 if(!spintime) {
e73aec82
MP		 1852 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1853 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1854 }
1855 break;
1856 }
1857
4451e472 1858 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1859
1860 if (spintime) {
1861 if (scsi_status_is_good(the_result))
1862 printk("ready\n");
1863 else
1864 printk("not responding...\n");
1865 }
1866}
1867
e0597d70
MP		 1868
1869/*
1870 * Determine whether disk supports Data Integrity Field.
1871 */
fe542396 1872static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1873{
1874 struct scsi_device *sdp = sdkp->device;
1875 u8 type;
fe542396 1876 int ret = 0;
e0597d70
MP		 1877
1878 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1879 return ret;
35e1a5d9
MP		 1880
1881 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1882
fe542396
MP		 1883 if (type > SD_DIF_TYPE3_PROTECTION)
1884 ret = -ENODEV;
1885 else if (scsi_host_dif_capable(sdp->host, type))
1886 ret = 1;
1887
1888 if (sdkp->first_scan || type != sdkp->protection_type)
1889 switch (ret) {
1890 case -ENODEV:
1891 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1892 " protection type %u. Disabling disk!\n",
1893 type);
1894 break;
1895 case 1:
1896 sd_printk(KERN_NOTICE, sdkp,
1897 "Enabling DIF Type %u protection\n", type);
1898 break;
1899 case 0:
1900 sd_printk(KERN_NOTICE, sdkp,
1901 "Disabling DIF Type %u protection\n", type);
1902 break;
1903 }
e0597d70 1904
be922f47
MP		 1905 sdkp->protection_type = type;
1906
fe542396 1907 return ret;
e0597d70
MP		 1908}
1909
0da205e0
MW		 1910static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1911 struct scsi_sense_hdr *sshdr, int sense_valid,
1912 int the_result)
1913{
1914 sd_print_result(sdkp, the_result);
1915 if (driver_byte(the_result) & DRIVER_SENSE)
1916 sd_print_sense_hdr(sdkp, sshdr);
1917 else
1918 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1919
1920 /*
1921 * Set dirty bit for removable devices if not ready -
1922 * sometimes drives will not report this properly.
1923 */
1924 if (sdp->removable &&
1925 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1926 set_media_not_present(sdkp);
0da205e0
MW		 1927
1928 /*
1929 * We used to set media_present to 0 here to indicate no media
1930 * in the drive, but some drives fail read capacity even with
1931 * media present, so we can't do that.
1932 */
1933 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1934}
1935
1936#define RC16_LEN 32
1937#if RC16_LEN > SD_BUF_SIZE
1938#error RC16_LEN must not be more than SD_BUF_SIZE
1939#endif
1940
3233ac19
JB		 1941#define READ_CAPACITY_RETRIES_ON_RESET 10
1942
937f0761
MP		 1943/*
1944 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
1945 * and the reported logical block size is bigger than 512 bytes. Note
1946 * that last_sector is a u64 and therefore logical_to_sectors() is not
1947 * applicable.
1948 */
1949static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
1950{
1951 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
1952
1953 if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
1954 return false;
1955
1956 return true;
1957}
1958
0da205e0
MW		 1959static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1960 unsigned char *buffer)
ea73a9f2 1961{
1da177e4 1962 unsigned char cmd[16];
1da177e4
LT		 1963 struct scsi_sense_hdr sshdr;
1964 int sense_valid = 0;
0da205e0 1965 int the_result;
3233ac19 1966 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1967 unsigned int alignment;
0da205e0
MW		 1968 unsigned long long lba;
1969 unsigned sector_size;
1da177e4 1970
5ce524bd
HG		 1971 if (sdp->no_read_capacity_16)
1972 return -EINVAL;
1973
1da177e4 1974 do {
0da205e0
MW		 1975 memset(cmd, 0, 16);
1976 cmd[0] = SERVICE_ACTION_IN;
1977 cmd[1] = SAI_READ_CAPACITY_16;
1978 cmd[13] = RC16_LEN;
1979 memset(buffer, 0, RC16_LEN);
1980
ea73a9f2 1981 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1982 buffer, RC16_LEN, &sshdr,
1983 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1984
ea73a9f2 1985 if (media_not_present(sdkp, &sshdr))
0da205e0 1986 return -ENODEV;
1da177e4 1987
2b301307 1988 if (the_result) {
ea73a9f2 1989 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1990 if (sense_valid &&
1991 sshdr.sense_key == ILLEGAL_REQUEST &&
1992 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1993 sshdr.ascq == 0x00)
1994 /* Invalid Command Operation Code or
1995 * Invalid Field in CDB, just retry
1996 * silently with RC10 */
1997 return -EINVAL;
3233ac19
JB		 1998 if (sense_valid &&
1999 sshdr.sense_key == UNIT_ATTENTION &&
2000 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2001 /* Device reset might occur several times,
2002 * give it one more chance */
2003 if (--reset_retries > 0)
2004 continue;
2b301307 2005 }
1da177e4
LT		 2006 retries--;
2007
2008 } while (the_result && retries);
2009
0da205e0 2010 if (the_result) {
e73aec82 2011 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 2012 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2013 return -EINVAL;
2014 }
e73aec82 2015
8f76d151
DH		 2016 sector_size = get_unaligned_be32(&buffer[8]);
2017 lba = get_unaligned_be64(&buffer[0]);
0da205e0 2018
fe542396
MP		 2019 if (sd_read_protection_type(sdkp, buffer) < 0) {
2020 sdkp->capacity = 0;
2021 return -ENODEV;
2022 }
0da205e0 2023
937f0761 2024 if (!sd_addressable_capacity(lba, sector_size)) {
0da205e0
MW		 2025 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2026 "kernel compiled with support for large block "
2027 "devices.\n");
2028 sdkp->capacity = 0;
2029 return -EOVERFLOW;
2030 }
2031
ea09bcc9 2032 /* Logical blocks per physical block exponent */
526f7c79 2033 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 2034
2035 /* Lowest aligned logical block */
2036 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2037 blk_queue_alignment_offset(sdp->request_queue, alignment);
2038 if (alignment && sdkp->first_scan)
2039 sd_printk(KERN_NOTICE, sdkp,
2040 "physical block alignment offset: %u\n", alignment);
2041
c98a0eb0
MP		 2042 if (buffer[14] & 0x80) { /* LBPME */
2043 sdkp->lbpme = 1;
e339c1a7 2044
c98a0eb0
MP		 2045 if (buffer[14] & 0x40) /* LBPRZ */
2046 sdkp->lbprz = 1;
e339c1a7 2047
c98a0eb0 2048 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2049 }
2050
0da205e0
MW		 2051 sdkp->capacity = lba + 1;
2052 return sector_size;
2053}
2054
2055static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2056 unsigned char *buffer)
2057{
2058 unsigned char cmd[16];
2059 struct scsi_sense_hdr sshdr;
2060 int sense_valid = 0;
2061 int the_result;
3233ac19 2062 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2063 sector_t lba;
2064 unsigned sector_size;
2065
2066 do {
2067 cmd[0] = READ_CAPACITY;
2068 memset(&cmd[1], 0, 9);
2069 memset(buffer, 0, 8);
2070
2071 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2072 buffer, 8, &sshdr,
2073 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2074
2075 if (media_not_present(sdkp, &sshdr))
2076 return -ENODEV;
2077
3233ac19 2078 if (the_result) {
0da205e0 2079 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2080 if (sense_valid &&
2081 sshdr.sense_key == UNIT_ATTENTION &&
2082 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2083 /* Device reset might occur several times,
2084 * give it one more chance */
2085 if (--reset_retries > 0)
2086 continue;
2087 }
0da205e0
MW		 2088 retries--;
2089
2090 } while (the_result && retries);
2091
2092 if (the_result) {
2093 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2094 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2095 return -EINVAL;
2096 }
2097
8f76d151
DH		 2098 sector_size = get_unaligned_be32(&buffer[4]);
2099 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2100
5ce524bd
HG		 2101 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2102 /* Some buggy (usb cardreader) devices return an lba of
2103 0xffffffff when the want to report a size of 0 (with
2104 which they really mean no media is present) */
2105 sdkp->capacity = 0;
5cc10350 2106 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2107 return sector_size;
2108 }
2109
937f0761 2110 if (!sd_addressable_capacity(lba, sector_size)) {
0da205e0
MW		 2111 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2112 "kernel compiled with support for large block "
2113 "devices.\n");
2114 sdkp->capacity = 0;
2115 return -EOVERFLOW;
2116 }
2117
2118 sdkp->capacity = lba + 1;
526f7c79 2119 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2120 return sector_size;
2121}
2122
2b301307
MW		 2123static int sd_try_rc16_first(struct scsi_device *sdp)
2124{
f87146bb
HR		 2125 if (sdp->host->max_cmd_len < 16)
2126 return 0;
6a0bdffa
AS		 2127 if (sdp->try_rc_10_first)
2128 return 0;
2b301307
MW		 2129 if (sdp->scsi_level > SCSI_SPC_2)
2130 return 1;
2131 if (scsi_device_protection(sdp))
2132 return 1;
2133 return 0;
2134}
2135
0da205e0
MW		 2136/*
2137 * read disk capacity
2138 */
2139static void
2140sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2141{
2142 int sector_size;
2143 struct scsi_device *sdp = sdkp->device;
70a9b873 2144 sector_t old_capacity = sdkp->capacity;
0da205e0 2145
2b301307 2146 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2147 sector_size = read_capacity_16(sdkp, sdp, buffer);
2148 if (sector_size == -EOVERFLOW)
1da177e4 2149 goto got_data;
2b301307
MW		 2150 if (sector_size == -ENODEV)
2151 return;
2152 if (sector_size < 0)
2153 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2154 if (sector_size < 0)
2155 return;
1da177e4 2156 } else {
0da205e0
MW		 2157 sector_size = read_capacity_10(sdkp, sdp, buffer);
2158 if (sector_size == -EOVERFLOW)
2159 goto got_data;
2160 if (sector_size < 0)
2161 return;
2162 if ((sizeof(sdkp->capacity) > 4) &&
2163 (sdkp->capacity > 0xffffffffULL)) {
2164 int old_sector_size = sector_size;
2165 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2166 "Trying to use READ CAPACITY(16).\n");
2167 sector_size = read_capacity_16(sdkp, sdp, buffer);
2168 if (sector_size < 0) {
2169 sd_printk(KERN_NOTICE, sdkp,
2170 "Using 0xffffffff as device size\n");
2171 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2172 sector_size = old_sector_size;
2173 goto got_data;
2174 }
2175 }
2176 }
1da177e4 2177
5c211caa
AS		 2178 /* Some devices are known to return the total number of blocks,
2179 * not the highest block number. Some devices have versions
2180 * which do this and others which do not. Some devices we might
2181 * suspect of doing this but we don't know for certain.
2182 *
2183 * If we know the reported capacity is wrong, decrement it. If
2184 * we can only guess, then assume the number of blocks is even
2185 * (usually true but not always) and err on the side of lowering
2186 * the capacity.
2187 */
2188 if (sdp->fix_capacity ||
2189 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2190 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2191 "from its reported value: %llu\n",
2192 (unsigned long long) sdkp->capacity);
1da177e4 2193 --sdkp->capacity;
61bf54b7
ON		 2194 }
2195
1da177e4
LT		 2196got_data:
2197 if (sector_size == 0) {
2198 sector_size = 512;
e73aec82
MP		 2199 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2200 "assuming 512.\n");
1da177e4
LT		 2201 }
2202
2203 if (sector_size != 512 &&
2204 sector_size != 1024 &&
2205 sector_size != 2048 &&
2206 sector_size != 4096 &&
2207 sector_size != 256) {
e73aec82
MP		 2208 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2209 sector_size);
1da177e4
LT		 2210 /*
2211 * The user might want to re-format the drive with
2212 * a supported sectorsize. Once this happens, it
2213 * would be relatively trivial to set the thing up.
2214 * For this reason, we leave the thing in the table.
2215 */
2216 sdkp->capacity = 0;
2217 /*
2218 * set a bogus sector size so the normal read/write
2219 * logic in the block layer will eventually refuse any
2220 * request on this device without tripping over power
2221 * of two sector size assumptions
2222 */
2223 sector_size = 512;
2224 }
e1defc4f 2225 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2226
1da177e4 2227 {
7404ad3b 2228 char cap_str_2[10], cap_str_10[10];
520a2c27 2229 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2230
7404ad3b
JB		 2231 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2232 sizeof(cap_str_2));
2233 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2234 sizeof(cap_str_10));
1da177e4 2235
ea09bcc9 2236 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2237 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2238 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2239 (unsigned long long)sdkp->capacity,
2240 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2241
526f7c79 2242 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2243 sd_printk(KERN_NOTICE, sdkp,
2244 "%u-byte physical blocks\n",
526f7c79 2245 sdkp->physical_block_size);
ea09bcc9 2246 }
1da177e4
LT		 2247 }
2248
53ad570b
JH		 2249 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2250
1da177e4
LT		 2251 /* Rescale capacity to 512-byte units */
2252 if (sector_size == 4096)
2253 sdkp->capacity <<= 3;
2254 else if (sector_size == 2048)
2255 sdkp->capacity <<= 2;
2256 else if (sector_size == 1024)
2257 sdkp->capacity <<= 1;
2258 else if (sector_size == 256)
2259 sdkp->capacity >>= 1;
2260
526f7c79
MP		 2261 blk_queue_physical_block_size(sdp->request_queue,
2262 sdkp->physical_block_size);
1da177e4
LT		 2263 sdkp->device->sector_size = sector_size;
2264}
2265
2266/* called with buffer of length 512 */
2267static inline int
ea73a9f2
JB		 2268sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2269 unsigned char *buffer, int len, struct scsi_mode_data *data,
2270 struct scsi_sense_hdr *sshdr)
1da177e4 2271{
ea73a9f2 2272 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2273 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2274 sshdr);
1da177e4
LT		 2275}
2276
2277/*
2278 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2279 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2280 */
2281static void
e73aec82 2282sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2283{
1da177e4 2284 int res;
ea73a9f2 2285 struct scsi_device *sdp = sdkp->device;
1da177e4 2286 struct scsi_mode_data data;
70a9b873 2287 int old_wp = sdkp->write_prot;
1da177e4
LT		 2288
2289 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2290 if (sdp->skip_ms_page_3f) {
e73aec82 2291 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2292 return;
2293 }
2294
ea73a9f2
JB		 2295 if (sdp->use_192_bytes_for_3f) {
2296 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2297 } else {
2298 /*
2299 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2300 * We have to start carefully: some devices hang if we ask
2301 * for more than is available.
2302 */
ea73a9f2 2303 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2304
2305 /*
2306 * Second attempt: ask for page 0 When only page 0 is
2307 * implemented, a request for page 3F may return Sense Key
2308 * 5: Illegal Request, Sense Code 24: Invalid field in
2309 * CDB.
2310 */
2311 if (!scsi_status_is_good(res))
ea73a9f2 2312 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2313
2314 /*
2315 * Third attempt: ask 255 bytes, as we did earlier.
2316 */
2317 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2318 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2319 &data, NULL);
1da177e4
LT		 2320 }
2321
2322 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2323 sd_printk(KERN_WARNING, sdkp,
2324 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2325 } else {
2326 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2327 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2328 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2329 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2330 sdkp->write_prot ? "on" : "off");
2331 sd_printk(KERN_DEBUG, sdkp,
2332 "Mode Sense: %02x %02x %02x %02x\n",
2333 buffer[0], buffer[1], buffer[2], buffer[3]);
2334 }
1da177e4
LT		 2335 }
2336}
2337
2338/*
2339 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2340 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2341 */
2342static void
e73aec82 2343sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2344{
1da177e4 2345 int len = 0, res;
ea73a9f2 2346 struct scsi_device *sdp = sdkp->device;
1da177e4 2347
631e8a13
AV		 2348 int dbd;
2349 int modepage;
0bcaa111 2350 int first_len;
1da177e4
LT		 2351 struct scsi_mode_data data;
2352 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2353 int old_wce = sdkp->WCE;
2354 int old_rcd = sdkp->RCD;
2355 int old_dpofua = sdkp->DPOFUA;
1da177e4 2356
39c60a09
JB		 2357
2358 if (sdkp->cache_override)
2359 return;
2360
0bcaa111
LT		 2361 first_len = 4;
2362 if (sdp->skip_ms_page_8) {
2363 if (sdp->type == TYPE_RBC)
2364 goto defaults;
2365 else {
2366 if (sdp->skip_ms_page_3f)
2367 goto defaults;
2368 modepage = 0x3F;
2369 if (sdp->use_192_bytes_for_3f)
2370 first_len = 192;
2371 dbd = 0;
2372 }
2373 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2374 modepage = 6;
2375 dbd = 8;
2376 } else {
2377 modepage = 8;
2378 dbd = 0;
2379 }
2380
1da177e4 2381 /* cautiously ask */
0bcaa111
LT		 2382 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2383 &data, &sshdr);
1da177e4
LT		 2384
2385 if (!scsi_status_is_good(res))
2386 goto bad_sense;
2387
6d73c851
AV		 2388 if (!data.header_length) {
2389 modepage = 6;
0bcaa111 2390 first_len = 0;
e73aec82 2391 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2392 }
2393
1da177e4
LT		 2394 /* that went OK, now ask for the proper length */
2395 len = data.length;
2396
2397 /*
2398 * We're only interested in the first three bytes, actually.
2399 * But the data cache page is defined for the first 20.
2400 */
2401 if (len < 3)
2402 goto bad_sense;
0bcaa111
LT		 2403 else if (len > SD_BUF_SIZE) {
2404 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2405 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2406 len = SD_BUF_SIZE;
2407 }
2408 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2409 len = 192;
1da177e4
LT		 2410
2411 /* Get the data */
0bcaa111
LT		 2412 if (len > first_len)
2413 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2414 &data, &sshdr);
1da177e4
LT		 2415
2416 if (scsi_status_is_good(res)) {
631e8a13 2417 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2418
0bcaa111
LT		 2419 while (offset < len) {
2420 u8 page_code = buffer[offset] & 0x3F;
2421 u8 spf = buffer[offset] & 0x40;
2422
2423 if (page_code == 8 || page_code == 6) {
2424 /* We're interested only in the first 3 bytes.
2425 */
2426 if (len - offset <= 2) {
2427 sd_printk(KERN_ERR, sdkp, "Incomplete "
2428 "mode parameter data\n");
2429 goto defaults;
2430 } else {
2431 modepage = page_code;
2432 goto Page_found;
2433 }
2434 } else {
2435 /* Go to the next page */
2436 if (spf && len - offset > 3)
2437 offset += 4 + (buffer[offset+2] << 8) +
2438 buffer[offset+3];
2439 else if (!spf && len - offset > 1)
2440 offset += 2 + buffer[offset+1];
2441 else {
2442 sd_printk(KERN_ERR, sdkp, "Incomplete "
2443 "mode parameter data\n");
2444 goto defaults;
2445 }
2446 }
48970800
AV		 2447 }
2448
13915e20
AS		 2449 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2450 goto defaults;
2451
0bcaa111 2452 Page_found:
631e8a13
AV		 2453 if (modepage == 8) {
2454 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2455 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2456 } else {
2457 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2458 sdkp->RCD = 0;
2459 }
1da177e4 2460
007365ad
TH		 2461 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2462 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2463 sd_printk(KERN_NOTICE, sdkp,
2464 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2465 sdkp->DPOFUA = 0;
2466 }
2467
70a9b873
MP		 2468 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2469 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2470 sd_printk(KERN_NOTICE, sdkp,
2471 "Write cache: %s, read cache: %s, %s\n",
2472 sdkp->WCE ? "enabled" : "disabled",
2473 sdkp->RCD ? "disabled" : "enabled",
2474 sdkp->DPOFUA ? "supports DPO and FUA"
2475 : "doesn't support DPO or FUA");
1da177e4
LT		 2476
2477 return;
2478 }
2479
2480bad_sense:
ea73a9f2 2481 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2482 sshdr.sense_key == ILLEGAL_REQUEST &&
2483 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2484 /* Invalid field in CDB */
2485 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2486 else
e73aec82 2487 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2488
2489defaults:
b81478d8
NJ		 2490 if (sdp->wce_default_on) {
2491 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2492 sdkp->WCE = 1;
2493 } else {
2494 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2495 sdkp->WCE = 0;
2496 }
1da177e4 2497 sdkp->RCD = 0;
48970800 2498 sdkp->DPOFUA = 0;
1da177e4
LT		 2499}
2500
e0597d70
MP		 2501/*
2502 * The ATO bit indicates whether the DIF application tag is available
2503 * for use by the operating system.
2504 */
439d77f7 2505static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2506{
2507 int res, offset;
2508 struct scsi_device *sdp = sdkp->device;
2509 struct scsi_mode_data data;
2510 struct scsi_sense_hdr sshdr;
2511
2512 if (sdp->type != TYPE_DISK)
2513 return;
2514
2515 if (sdkp->protection_type == 0)
2516 return;
2517
2518 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2519 SD_MAX_RETRIES, &data, &sshdr);
2520
2521 if (!scsi_status_is_good(res) || !data.header_length ||
2522 data.length < 6) {
2523 sd_printk(KERN_WARNING, sdkp,
2524 "getting Control mode page failed, assume no ATO\n");
2525
2526 if (scsi_sense_valid(&sshdr))
2527 sd_print_sense_hdr(sdkp, &sshdr);
2528
2529 return;
2530 }
2531
2532 offset = data.header_length + data.block_descriptor_length;
2533
2534 if ((buffer[offset] & 0x3f) != 0x0a) {
2535 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2536 return;
2537 }
2538
2539 if ((buffer[offset + 5] & 0x80) == 0)
2540 return;
2541
2542 sdkp->ATO = 1;
2543
2544 return;
2545}
2546
d11b6916
MP		 2547/**
2548 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2549 * @disk: disk to query
2550 */
2551static void sd_read_block_limits(struct scsi_disk *sdkp)
2552{
2553 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2554 const int vpd_len = 64;
e3deec09 2555 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2556
e3deec09
JB		 2557 if (!buffer ||
2558 /* Block Limits VPD */
2559 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2560 goto out;
d11b6916
MP		 2561
2562 blk_queue_io_min(sdkp->disk->queue,
2563 get_unaligned_be16(&buffer[6]) * sector_sz);
2564 blk_queue_io_opt(sdkp->disk->queue,
2565 get_unaligned_be32(&buffer[12]) * sector_sz);
2566
c98a0eb0
MP		 2567 if (buffer[3] == 0x3c) {
2568 unsigned int lba_count, desc_count;
e339c1a7 2569
5db44863 2570 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2571
c98a0eb0 2572 if (!sdkp->lbpme)
045d3fe7 2573 goto out;
045d3fe7 2574
c98a0eb0
MP		 2575 lba_count = get_unaligned_be32(&buffer[20]);
2576 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2577
c98a0eb0
MP		 2578 if (lba_count && desc_count)
2579 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2580
c98a0eb0 2581 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2582
2583 if (buffer[32] & 0x80)
c98a0eb0 2584 sdkp->unmap_alignment =
e339c1a7 2585 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2586
2587 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2588
2589 if (sdkp->max_unmap_blocks)
2590 sd_config_discard(sdkp, SD_LBP_UNMAP);
2591 else
2592 sd_config_discard(sdkp, SD_LBP_WS16);
2593
2594 } else { /* LBP VPD page tells us what to use */
2595
2596 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2597 sd_config_discard(sdkp, SD_LBP_UNMAP);
2598 else if (sdkp->lbpws)
2599 sd_config_discard(sdkp, SD_LBP_WS16);
2600 else if (sdkp->lbpws10)
2601 sd_config_discard(sdkp, SD_LBP_WS10);
2602 else
2603 sd_config_discard(sdkp, SD_LBP_DISABLE);
2604 }
e339c1a7
MP		 2605 }
2606
e3deec09 2607 out:
d11b6916
MP		 2608 kfree(buffer);
2609}
2610
3821d768
MP		 2611/**
2612 * sd_read_block_characteristics - Query block dev. characteristics
2613 * @disk: disk to query
2614 */
2615static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2616{
e3deec09 2617 unsigned char *buffer;
3821d768 2618 u16 rot;
bb2d3de1 2619 const int vpd_len = 64;
3821d768 2620
e3deec09 2621 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2622
e3deec09
JB		 2623 if (!buffer ||
2624 /* Block Device Characteristics VPD */
2625 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2626 goto out;
3821d768
MP		 2627
2628 rot = get_unaligned_be16(&buffer[4]);
2629
2630 if (rot == 1)
2631 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2632
e3deec09 2633 out:
3821d768
MP		 2634 kfree(buffer);
2635}
2636
045d3fe7 2637/**
c98a0eb0 2638 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2639 * @disk: disk to query
2640 */
c98a0eb0 2641static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2642{
2643 unsigned char *buffer;
2644 const int vpd_len = 8;
2645
c98a0eb0 2646 if (sdkp->lbpme == 0)
045d3fe7
MP		 2647 return;
2648
2649 buffer = kmalloc(vpd_len, GFP_KERNEL);
2650
2651 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2652 goto out;
2653
c98a0eb0
MP		 2654 sdkp->lbpvpd = 1;
2655 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2656 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2657 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2658
2659 out:
2660 kfree(buffer);
2661}
2662
5db44863
MP		 2663static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2664{
98dcc294
MP		 2665 struct scsi_device *sdev = sdkp->device;
2666
8562d028
MP		 2667 if (sdev->host->no_write_same) {
2668 sdev->no_write_same = 1;
2669
2670 return;
2671 }
2672
98dcc294 2673 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af313b03
BS		 2674 /* too large values might cause issues with arcmsr */
2675 int vpd_buf_len = 64;
2676
98dcc294
MP		 2677 sdev->no_report_opcodes = 1;
2678
2679 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2680 * CODES is unsupported and the device has an ATA
2681 * Information VPD page (SAT).
2682 */
af313b03 2683 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
98dcc294
MP		 2684 sdev->no_write_same = 1;
2685 }
2686
2687 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2688 sdkp->ws16 = 1;
98dcc294
MP		 2689
2690 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2691 sdkp->ws10 = 1;
5db44863
MP		 2692}
2693
ffd4bc2a
MP		 2694static int sd_try_extended_inquiry(struct scsi_device *sdp)
2695{
2696 /*
2697 * Although VPD inquiries can go to SCSI-2 type devices,
2698 * some USB ones crash on receiving them, and the pages
2699 * we currently ask for are for SPC-3 and beyond
2700 */
09b6b51b 2701 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2702 return 1;
2703 return 0;
2704}
2705
1da177e4
LT		 2706/**
2707 * sd_revalidate_disk - called the first time a new disk is seen,
2708 * performs disk spin up, read_capacity, etc.
2709 * @disk: struct gendisk we care about
2710 **/
2711static int sd_revalidate_disk(struct gendisk *disk)
2712{
2713 struct scsi_disk *sdkp = scsi_disk(disk);
2714 struct scsi_device *sdp = sdkp->device;
1da177e4 2715 unsigned char *buffer;
4913efe4 2716 unsigned flush = 0;
1da177e4 2717
fa0d34be
MP		 2718 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2719 "sd_revalidate_disk\n"));
1da177e4
LT		 2720
2721 /*
2722 * If the device is offline, don't try and read capacity or any
2723 * of the other niceties.
2724 */
2725 if (!scsi_device_online(sdp))
2726 goto out;
2727
a6123f14 2728 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2729 if (!buffer) {
e73aec82
MP		 2730 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2731 "allocation failure.\n");
ea73a9f2 2732 goto out;
1da177e4
LT		 2733 }
2734
e73aec82 2735 sd_spinup_disk(sdkp);
1da177e4
LT		 2736
2737 /*
2738 * Without media there is no reason to ask; moreover, some devices
2739 * react badly if we do.
2740 */
2741 if (sdkp->media_present) {
e73aec82 2742 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2743
2744 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2745 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2746 sd_read_block_limits(sdkp);
2747 sd_read_block_characteristics(sdkp);
2748 }
2749
e73aec82
MP		 2750 sd_read_write_protect_flag(sdkp, buffer);
2751 sd_read_cache_type(sdkp, buffer);
e0597d70 2752 sd_read_app_tag_own(sdkp, buffer);
5db44863 2753 sd_read_write_same(sdkp, buffer);
1da177e4 2754 }
461d4e90 2755
70a9b873
MP		 2756 sdkp->first_scan = 0;
2757
461d4e90
TH		 2758 /*
2759 * We now have all cache related info, determine how we deal
4913efe4 2760 * with flush requests.
461d4e90 2761 */
4913efe4
TH		 2762 if (sdkp->WCE) {
2763 flush |= REQ_FLUSH;
2764 if (sdkp->DPOFUA)
2765 flush |= REQ_FUA;
2766 }
461d4e90 2767
4913efe4 2768 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2769
1da177e4 2770 set_capacity(disk, sdkp->capacity);
5db44863 2771 sd_config_write_same(sdkp);
1da177e4
LT		 2772 kfree(buffer);
2773
1da177e4
LT		 2774 out:
2775 return 0;
2776}
2777
72ec24bd
TH		 2778/**
2779 * sd_unlock_native_capacity - unlock native capacity
2780 * @disk: struct gendisk to set capacity for
2781 *
2782 * Block layer calls this function if it detects that partitions
2783 * on @disk reach beyond the end of the device. If the SCSI host
2784 * implements ->unlock_native_capacity() method, it's invoked to
2785 * give it a chance to adjust the device capacity.
2786 *
2787 * CONTEXT:
2788 * Defined by block layer. Might sleep.
2789 */
2790static void sd_unlock_native_capacity(struct gendisk *disk)
2791{
2792 struct scsi_device *sdev = scsi_disk(disk)->device;
2793
2794 if (sdev->host->hostt->unlock_native_capacity)
2795 sdev->host->hostt->unlock_native_capacity(sdev);
2796}
2797
3e1a7ff8
TH		 2798/**
2799 * sd_format_disk_name - format disk name
2800 * @prefix: name prefix - ie. "sd" for SCSI disks
2801 * @index: index of the disk to format name for
2802 * @buf: output buffer
2803 * @buflen: length of the output buffer
2804 *
2805 * SCSI disk names starts at sda. The 26th device is sdz and the
2806 * 27th is sdaa. The last one for two lettered suffix is sdzz
2807 * which is followed by sdaaa.
2808 *
2809 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2810 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2811 * determined using similar method as 26 base conversion with the
2812 * index shifted -1 after each digit is computed.
2813 *
2814 * CONTEXT:
2815 * Don't care.
2816 *
2817 * RETURNS:
2818 * 0 on success, -errno on failure.
2819 */
2820static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2821{
2822 const int base = 'z' - 'a' + 1;
2823 char *begin = buf + strlen(prefix);
2824 char *end = buf + buflen;
2825 char *p;
2826 int unit;
2827
2828 p = end - 1;
2829 *p = '\0';
2830 unit = base;
2831 do {
2832 if (p == begin)
2833 return -EINVAL;
2834 *--p = 'a' + (index % unit);
2835 index = (index / unit) - 1;
2836 } while (index >= 0);
2837
2838 memmove(begin, p, end - p);
2839 memcpy(buf, prefix, strlen(prefix));
2840
2841 return 0;
2842}
2843
4ace92fc
AV		 2844/*
2845 * The asynchronous part of sd_probe
2846 */
2847static void sd_probe_async(void *data, async_cookie_t cookie)
2848{
2849 struct scsi_disk *sdkp = data;
2850 struct scsi_device *sdp;
2851 struct gendisk *gd;
2852 u32 index;
2853 struct device *dev;
2854
2855 sdp = sdkp->device;
2856 gd = sdkp->disk;
2857 index = sdkp->index;
2858 dev = &sdp->sdev_gendev;
2859
1a03ae0f
MR		 2860 gd->major = sd_major((index & 0xf0) >> 4);
2861 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2862 gd->minors = SD_MINORS;
2863
4ace92fc
AV		 2864 gd->fops = &sd_fops;
2865 gd->private_data = &sdkp->driver;
2866 gd->queue = sdkp->device->request_queue;
2867
70a9b873
MP		 2868 /* defaults, until the device tells us otherwise */
2869 sdp->sector_size = 512;
2870 sdkp->capacity = 0;
2871 sdkp->media_present = 1;
2872 sdkp->write_prot = 0;
39c60a09 2873 sdkp->cache_override = 0;
70a9b873
MP		 2874 sdkp->WCE = 0;
2875 sdkp->RCD = 0;
2876 sdkp->ATO = 0;
2877 sdkp->first_scan = 1;
18a4d0a2 2878 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2879
4ace92fc 2880 sd_revalidate_disk(gd);
6fa3eb70
S		 2881#ifdef CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT
2882 sdkp->old_media_present = sdkp->media_present; //add for sdcard hotplug
2883#endif
4ace92fc
AV		 2884
2885 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2886 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2887
2888 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2889 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2890 if (sdp->removable) {
4ace92fc 2891 gd->flags |= GENHD_FL_REMOVABLE;
6fa3eb70
S		 2892#ifdef CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT
2893 gd->events |= DISK_EVENT_MEDIA_CHANGE|DISK_EVENT_MEDIA_DISAPPEAR; //add for sdcard hotplug
2894#else
2bae0093 2895 gd->events |= DISK_EVENT_MEDIA_CHANGE;
6fa3eb70 2896#endif
2bae0093 2897 }
4ace92fc 2898
da0d4136 2899 blk_pm_runtime_init(sdp->request_queue, dev);
4ace92fc 2900 add_disk(gd);
fe542396
MP		 2901 if (sdkp->capacity)
2902 sd_dif_config_host(sdkp);
4ace92fc 2903
3821d768
MP		 2904 sd_revalidate_disk(gd);
2905
4ace92fc
AV		 2906 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2907 sdp->removable ? "removable " : "");
478a8a05 2908 scsi_autopm_put_device(sdp);
ea038f63 2909 put_device(&sdkp->dev);
4ace92fc
AV		 2910}
2911
1da177e4
LT		 2912/**
2913 * sd_probe - called during driver initialization and whenever a
2914 * new scsi device is attached to the system. It is called once
2915 * for each scsi device (not just disks) present.
2916 * @dev: pointer to device object
2917 *
2918 * Returns 0 if successful (or not interested in this scsi device
2919 * (e.g. scanner)); 1 when there is an error.
2920 *
2921 * Note: this function is invoked from the scsi mid-level.
2922 * This function sets up the mapping between a given
2923 * <host,channel,id,lun> (found in sdp) and new device name
2924 * (e.g. /dev/sda). More precisely it is the block device major
2925 * and minor number that is chosen here.
2926 *
2db93ce8
PU		 2927 * Assume sd_probe is not re-entrant (for time being)
2928 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2929 **/
2930static int sd_probe(struct device *dev)
2931{
2932 struct scsi_device *sdp = to_scsi_device(dev);
2933 struct scsi_disk *sdkp;
2934 struct gendisk *gd;
439d77f7 2935 int index;
1da177e4
LT		 2936 int error;
2937
2938 error = -ENODEV;
631e8a13 2939 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2940 goto out;
2941
9ccfc756 2942 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2943 "sd_probe\n"));
1da177e4
LT		 2944
2945 error = -ENOMEM;
24669f75 2946 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2947 if (!sdkp)
2948 goto out;
2949
689d6fac 2950 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2951 if (!gd)
2952 goto out_free;
2953
f27bac27
TH		 2954 do {
2955 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2956 goto out_put;
1da177e4 2957
4034cc68 2958 spin_lock(&sd_index_lock);
f27bac27 2959 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2960 spin_unlock(&sd_index_lock);
f27bac27 2961 } while (error == -EAGAIN);
1da177e4 2962
21208ae5
DK		 2963 if (error) {
2964 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2965 goto out_put;
1a03ae0f
MR		 2966 }
2967
3e1a7ff8 2968 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2969 if (error) {
2970 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2971 goto out_free_index;
21208ae5 2972 }
f27bac27 2973
1da177e4
LT		 2974 sdkp->device = sdp;
2975 sdkp->driver = &sd_template;
2976 sdkp->disk = gd;
2977 sdkp->index = index;
409f3499 2978 atomic_set(&sdkp->openers, 0);
9e1a1537 2979 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2980
601e7638
JB		 2981 if (!sdp->request_queue->rq_timeout) {
2982 if (sdp->type != TYPE_MOD)
2983 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2984 else
2985 blk_queue_rq_timeout(sdp->request_queue,
2986 SD_MOD_TIMEOUT);
2987 }
2988
2989 device_initialize(&sdkp->dev);
478a8a05 2990 sdkp->dev.parent = dev;
601e7638 2991 sdkp->dev.class = &sd_disk_class;
478a8a05 2992 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2993
2994 if (device_add(&sdkp->dev))
2995 goto out_free_index;
2996
478a8a05
AS		 2997 get_device(dev);
2998 dev_set_drvdata(dev, sdkp);
601e7638 2999
ea038f63 3000 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 3001 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 3002
3003 return 0;
3004
f27bac27 3005 out_free_index:
4034cc68 3006 spin_lock(&sd_index_lock);
f27bac27 3007 ida_remove(&sd_index_ida, index);
4034cc68 3008 spin_unlock(&sd_index_lock);
6bdaa1f1 3009 out_put:
1da177e4 3010 put_disk(gd);
6bdaa1f1 3011 out_free:
1da177e4 3012 kfree(sdkp);
6bdaa1f1 3013 out:
1da177e4
LT		 3014 return error;
3015}
3016
3017/**
3018 * sd_remove - called whenever a scsi disk (previously recognized by
3019 * sd_probe) is detached from the system. It is called (potentially
3020 * multiple times) during sd module unload.
3021 * @sdp: pointer to mid level scsi device object
3022 *
3023 * Note: this function is invoked from the scsi mid-level.
3024 * This function potentially frees up a device name (e.g. /dev/sdc)
3025 * that could be re-used by a subsequent sd_probe().
3026 * This function is not called when the built-in sd driver is "exit-ed".
3027 **/
3028static int sd_remove(struct device *dev)
3029{
601e7638 3030 struct scsi_disk *sdkp;
1da177e4 3031
601e7638 3032 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 3033 scsi_autopm_get_device(sdkp->device);
3034
a7a20d10 3035 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 3036 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 3037 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 3038 device_del(&sdkp->dev);
1da177e4
LT		 3039 del_gendisk(sdkp->disk);
3040 sd_shutdown(dev);
39b7f1e2 3041
0b950672 3042 mutex_lock(&sd_ref_mutex);
39b7f1e2 3043 dev_set_drvdata(dev, NULL);
ee959b00 3044 put_device(&sdkp->dev);
0b950672 3045 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3046
3047 return 0;
3048}
3049
3050/**
3051 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3052 * @dev: pointer to embedded class device
1da177e4 3053 *
0b950672 3054 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3055 * called on last put, you should always use the scsi_disk_get()
3056 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3057 * and never do a direct put_device.
1da177e4 3058 **/
ee959b00 3059static void scsi_disk_release(struct device *dev)
1da177e4 3060{
ee959b00 3061 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3062 struct gendisk *disk = sdkp->disk;
3063
4034cc68 3064 spin_lock(&sd_index_lock);
f27bac27 3065 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 3066 spin_unlock(&sd_index_lock);
1da177e4
LT		 3067
3068 disk->private_data = NULL;
1da177e4 3069 put_disk(disk);
39b7f1e2 3070 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3071
3072 kfree(sdkp);
3073}
3074
cc5d2c8c 3075static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3076{
3077 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3078 struct scsi_sense_hdr sshdr;
cc5d2c8c 3079 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3080 int res;
3081
3082 if (start)
3083 cmd[4] |= 1; /* START */
3084
d2886ea3
SR		 3085 if (sdp->start_stop_pwr_cond)
3086 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3087
c3c94c5a
TH		 3088 if (!scsi_device_online(sdp))
3089 return -ENODEV;
3090
9b21493c
LM		 3091 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3092 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
c3c94c5a 3093 if (res) {
cc5d2c8c
JB		 3094 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3095 sd_print_result(sdkp, res);
c3c94c5a 3096 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3097 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 3098 }
3099
3100 return res;
3101}
3102
1da177e4
LT		 3103/*
3104 * Send a SYNCHRONIZE CACHE instruction down to the device through
3105 * the normal SCSI command structure. Wait for the command to
3106 * complete.
3107 */
3108static void sd_shutdown(struct device *dev)
3109{
39b7f1e2 3110 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 3111
3112 if (!sdkp)
3113 return; /* this can happen */
3114
54f57588
LM		 3115 if (pm_runtime_suspended(dev))
3116 goto exit;
3117
39b7f1e2 3118 if (sdkp->WCE) {
e73aec82
MP		 3119 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3120 sd_sync_cache(sdkp);
39b7f1e2 3121 }
c3c94c5a 3122
cc5d2c8c
JB		 3123 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3124 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3125 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3126 }
3127
54f57588 3128exit:
39b7f1e2
AS		 3129 scsi_disk_put(sdkp);
3130}
1da177e4 3131
691e3d31 3132static int sd_suspend(struct device *dev)
c3c94c5a 3133{
c3c94c5a 3134 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3135 int ret = 0;
c3c94c5a 3136
3d1df278
AS		 3137 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3138 return 0;
c3c94c5a
TH		 3139
3140 if (sdkp->WCE) {
cc5d2c8c 3141 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 3142 ret = sd_sync_cache(sdkp);
3143 if (ret)
09ff92fe 3144 goto done;
c3c94c5a
TH		 3145 }
3146
691e3d31 3147 if (sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 3148 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3149 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3150 }
3151
09ff92fe
AS		 3152done:
3153 scsi_disk_put(sdkp);
3154 return ret;
c3c94c5a
TH		 3155}
3156
3157static int sd_resume(struct device *dev)
3158{
c3c94c5a 3159 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3160 int ret = 0;
c3c94c5a 3161
3d1df278
AS		 3162 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3163 return 0;
3164
cc5d2c8c 3165 if (!sdkp->device->manage_start_stop)
09ff92fe 3166 goto done;
c3c94c5a 3167
cc5d2c8c 3168 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 3169 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 3170
09ff92fe
AS		 3171done:
3172 scsi_disk_put(sdkp);
3173 return ret;
c3c94c5a
TH		 3174}
3175
1da177e4
LT		 3176/**
3177 * init_sd - entry point for this driver (both when built in or when
3178 * a module).
3179 *
3180 * Note: this function registers this driver with the scsi mid-level.
3181 **/
3182static int __init init_sd(void)
3183{
5e4009ba 3184 int majors = 0, i, err;
1da177e4
LT		 3185
3186 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3187
3188 for (i = 0; i < SD_MAJORS; i++)
3189 if (register_blkdev(sd_major(i), "sd") == 0)
3190 majors++;
3191
3192 if (!majors)
3193 return -ENODEV;
3194
5e4009ba
JG		 3195 err = class_register(&sd_disk_class);
3196 if (err)
3197 goto err_out;
6bdaa1f1 3198
4e7392ec
MP		 3199 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3200 0, 0, NULL);
3201 if (!sd_cdb_cache) {
3202 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3203 goto err_out_class;
3204 }
3205
3206 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3207 if (!sd_cdb_pool) {
3208 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3209 goto err_out_cache;
3210 }
3211
afd5e34b
JD		 3212 err = scsi_register_driver(&sd_template.gendrv);
3213 if (err)
3214 goto err_out_driver;
3215
5e4009ba
JG		 3216 return 0;
3217
afd5e34b
JD		 3218err_out_driver:
3219 mempool_destroy(sd_cdb_pool);
3220
4e7392ec
MP		 3221err_out_cache:
3222 kmem_cache_destroy(sd_cdb_cache);
3223
5e4009ba
JG		 3224err_out_class:
3225 class_unregister(&sd_disk_class);
3226err_out:
3227 for (i = 0; i < SD_MAJORS; i++)
3228 unregister_blkdev(sd_major(i), "sd");
3229 return err;
1da177e4
LT		 3230}
3231
3232/**
3233 * exit_sd - exit point for this driver (when it is a module).
3234 *
3235 * Note: this function unregisters this driver from the scsi mid-level.
3236 **/
3237static void __exit exit_sd(void)
3238{
3239 int i;
3240
3241 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3242
afd5e34b 3243 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3244 mempool_destroy(sd_cdb_pool);
3245 kmem_cache_destroy(sd_cdb_cache);
3246
5e4009ba
JG		 3247 class_unregister(&sd_disk_class);
3248
1da177e4
LT		 3249 for (i = 0; i < SD_MAJORS; i++)
3250 unregister_blkdev(sd_major(i), "sd");
3251}
3252
1da177e4
LT		 3253module_init(init_sd);
3254module_exit(exit_sd);
e73aec82
MP		 3255
3256static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3257 struct scsi_sense_hdr *sshdr)
3258{
2e4c3329 3259 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3260 scsi_show_sense_hdr(sshdr);
2e4c3329 3261 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3262 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3263}
3264
3265static void sd_print_result(struct scsi_disk *sdkp, int result)
3266{
2e4c3329 3267 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3268 scsi_show_result(result);
3269}
3270
kernel source for telekom puls (alcatel/mediatek)