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scsi: sr: Sanity check returned mode data
[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
LT		 1356{
1357 struct scsi_disk *sdkp = scsi_disk(disk);
1358 struct scsi_device *sdp = sdkp->device;
001aac25 1359 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1360 int retval;
1361
2bae0093 1362 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1363
1364 /*
1365 * If the device is offline, don't send any commands - just pretend as
1366 * if the command failed. If the device ever comes back online, we
1367 * can deal with it then. It is only because of unrecoverable errors
1368 * that we would ever take a device offline in the first place.
1369 */
285e9670
KS		 1370 if (!scsi_device_online(sdp)) {
1371 set_media_not_present(sdkp);
285e9670
KS		 1372 goto out;
1373 }
1da177e4
LT		 1374
1375 /*
1376 * Using TEST_UNIT_READY enables differentiation between drive with
1377 * no cartridge loaded - NOT READY, drive with changed cartridge -
1378 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1379 *
1380 * Drives that auto spin down. eg iomega jaz 1G, will be started
1381 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1382 * sd_revalidate() is called.
1383 */
1384 retval = -ENODEV;
285e9670 1385
001aac25
JB		 1386 if (scsi_block_when_processing_errors(sdp)) {
1387 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1388 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1389 sshdr);
1390 }
1da177e4 1391
2bae0093
TH		 1392 /* failed to execute TUR, assume media not present */
1393 if (host_byte(retval)) {
285e9670 1394 set_media_not_present(sdkp);
285e9670
KS		 1395 goto out;
1396 }
1da177e4 1397
2bae0093
TH		 1398 if (media_not_present(sdkp, sshdr))
1399 goto out;
1400
1da177e4
LT		 1401 /*
1402 * For removable scsi disk we have to recognise the presence
2bae0093 1403 * of a disk in the drive.
1da177e4 1404 */
2bae0093
TH		 1405 if (!sdkp->media_present)
1406 sdp->changed = 1;
1da177e4 1407 sdkp->media_present = 1;
285e9670 1408out:
3ff5588d 1409 /*
2bae0093 1410 * sdp->changed is set under the following conditions:
3ff5588d 1411 *
2bae0093
TH		 1412 * Medium present state has changed in either direction.
1413 * Device has indicated UNIT_ATTENTION.
3ff5588d 1414 */
001aac25 1415 kfree(sshdr);
2bae0093
TH		 1416 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1417 sdp->changed = 0;
1da177e4 1418 return retval;
1da177e4
LT		 1419}
1420
e73aec82 1421static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1422{
1da177e4 1423 int retries, res;
e73aec82 1424 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1425 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1426
1427 if (!scsi_device_online(sdp))
1428 return -ENODEV;
1429
1da177e4 1430
1da177e4
LT		 1431 for (retries = 3; retries > 0; --retries) {
1432 unsigned char cmd[10] = { 0 };
1433
1434 cmd[0] = SYNCHRONIZE_CACHE;
1435 /*
1436 * Leave the rest of the command zero to indicate
1437 * flush everything.
1438 */
9b21493c
LM		 1439 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1440 &sshdr, SD_FLUSH_TIMEOUT,
1441 SD_MAX_RETRIES, NULL, REQ_PM);
ea73a9f2 1442 if (res == 0)
1da177e4
LT		 1443 break;
1444 }
1445
e73aec82
MP		 1446 if (res) {
1447 sd_print_result(sdkp, res);
1448 if (driver_byte(res) & DRIVER_SENSE)
1449 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1450 }
1451
3721050a
TH		 1452 if (res)
1453 return -EIO;
1454 return 0;
1da177e4
LT		 1455}
1456
1da177e4
LT		 1457static void sd_rescan(struct device *dev)
1458{
39b7f1e2
AS		 1459 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1460
1461 if (sdkp) {
f98a8cae 1462 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1463 scsi_disk_put(sdkp);
1464 }
1da177e4
LT		 1465}
1466
1467
1468#ifdef CONFIG_COMPAT
1469/*
1470 * This gets directly called from VFS. When the ioctl
1471 * is not recognized we go back to the other translation paths.
1472 */
0338e291
AV		 1473static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1474 unsigned int cmd, unsigned long arg)
1da177e4 1475{
0338e291 1476 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1477 int ret;
1478
1479 ret = scsi_verify_blk_ioctl(bdev, cmd);
1480 if (ret < 0)
1481 return ret;
1da177e4
LT		 1482
1483 /*
1484 * If we are in the middle of error recovery, don't let anyone
1485 * else try and use this device. Also, if error recovery fails, it
1486 * may try and take the device offline, in which case all further
1487 * access to the device is prohibited.
1488 */
1489 if (!scsi_block_when_processing_errors(sdev))
1490 return -ENODEV;
1491
1492 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1493 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1494
1495 return ret;
1496 }
1497
1498 /*
1499 * Let the static ioctl translation table take care of it.
1500 */
1501 return -ENOIOCTLCMD;
1502}
1503#endif
1504
83d5cde4 1505static const struct block_device_operations sd_fops = {
1da177e4 1506 .owner = THIS_MODULE,
0338e291
AV		 1507 .open = sd_open,
1508 .release = sd_release,
8a6cfeb6 1509 .ioctl = sd_ioctl,
a885c8c4 1510 .getgeo = sd_getgeo,
1da177e4 1511#ifdef CONFIG_COMPAT
0338e291 1512 .compat_ioctl = sd_compat_ioctl,
1da177e4 1513#endif
2bae0093 1514 .check_events = sd_check_events,
1da177e4 1515 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1516 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1517};
1518
18a4d0a2
MP		 1519/**
1520 * sd_eh_action - error handling callback
1521 * @scmd: sd-issued command that has failed
1522 * @eh_cmnd: The command that was sent during error handling
1523 * @eh_cmnd_len: Length of eh_cmnd in bytes
1524 * @eh_disp: The recovery disposition suggested by the midlayer
1525 *
1526 * This function is called by the SCSI midlayer upon completion of
1527 * an error handling command (TEST UNIT READY, START STOP UNIT,
1528 * etc.) The command sent to the device by the error handler is
1529 * stored in eh_cmnd. The result of sending the eh command is
1530 * passed in eh_disp.
1531 **/
1532static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1533 int eh_cmnd_len, int eh_disp)
1534{
1535 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1536
1537 if (!scsi_device_online(scmd->device) ||
1538 !scsi_medium_access_command(scmd))
1539 return eh_disp;
1540
1541 /*
1542 * The device has timed out executing a medium access command.
1543 * However, the TEST UNIT READY command sent during error
1544 * handling completed successfully. Either the device is in the
1545 * process of recovering or has it suffered an internal failure
1546 * that prevents access to the storage medium.
1547 */
1548 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1549 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1550 sdkp->medium_access_timed_out++;
1551
1552 /*
1553 * If the device keeps failing read/write commands but TEST UNIT
1554 * READY always completes successfully we assume that medium
1555 * access is no longer possible and take the device offline.
1556 */
1557 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1558 scmd_printk(KERN_ERR, scmd,
1559 "Medium access timeout failure. Offlining disk!\n");
1560 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1561
1562 return FAILED;
1563 }
1564
1565 return eh_disp;
1566}
1567
af55ff67
MP		 1568static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1569{
83096ebf
TH		 1570 u64 start_lba = blk_rq_pos(scmd->request);
1571 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1572 u64 bad_lba;
1573 int info_valid;
a8733c7b
JB		 1574 /*
1575 * resid is optional but mostly filled in. When it's unused,
1576 * its value is zero, so we assume the whole buffer transferred
1577 */
1578 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1579 unsigned int good_bytes;
af55ff67 1580
33659ebb 1581 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1582 return 0;
1583
1584 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1585 SCSI_SENSE_BUFFERSIZE,
1586 &bad_lba);
1587 if (!info_valid)
1588 return 0;
1589
1590 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1591 return 0;
1592
1593 if (scmd->device->sector_size < 512) {
1594 /* only legitimate sector_size here is 256 */
1595 start_lba <<= 1;
1596 end_lba <<= 1;
1597 } else {
1598 /* be careful ... don't want any overflows */
1599 u64 factor = scmd->device->sector_size / 512;
1600 do_div(start_lba, factor);
1601 do_div(end_lba, factor);
1602 }
1603
1604 /* The bad lba was reported incorrectly, we have no idea where
1605 * the error is.
1606 */
1607 if (bad_lba < start_lba || bad_lba >= end_lba)
1608 return 0;
1609
1610 /* This computation should always be done in terms of
1611 * the resolution of the device's medium.
1612 */
a8733c7b
JB		 1613 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1614 return min(good_bytes, transferred);
af55ff67
MP		 1615}
1616
1da177e4 1617/**
7b3d9545 1618 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1619 * driver has completed (successfully or otherwise) a scsi command.
1620 * @SCpnt: mid-level's per command structure.
1621 *
1622 * Note: potentially run from within an ISR. Must not block.
1623 **/
7b3d9545 1624static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1625{
1626 int result = SCpnt->result;
af55ff67 1627 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1628 struct scsi_sense_hdr sshdr;
4e7392ec 1629 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1630 struct request *req = SCpnt->request;
1da177e4
LT		 1631 int sense_valid = 0;
1632 int sense_deferred = 0;
c98a0eb0 1633 unsigned char op = SCpnt->cmnd[0];
5db44863 1634 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1635
5db44863 1636 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1637 if (!result) {
1638 good_bytes = blk_rq_bytes(req);
1639 scsi_set_resid(SCpnt, 0);
1640 } else {
1641 good_bytes = 0;
1642 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1643 }
1644 }
6a32a8ae 1645
1da177e4
LT		 1646 if (result) {
1647 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1648 if (sense_valid)
1649 sense_deferred = scsi_sense_is_deferred(&sshdr);
1650 }
1da177e4 1651#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1652 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1653 if (sense_valid) {
fa0d34be 1654 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1655 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1656 "ascq]=%x,%x,%x,%x\n",
1657 sshdr.response_code,
1658 sshdr.sense_key, sshdr.asc,
1659 sshdr.ascq));
1da177e4
LT		 1660 }
1661#endif
03aba2f7
LT		 1662 if (driver_byte(result) != DRIVER_SENSE &&
1663 (!sense_valid || sense_deferred))
1664 goto out;
1665
18a4d0a2
MP		 1666 sdkp->medium_access_timed_out = 0;
1667
03aba2f7
LT		 1668 switch (sshdr.sense_key) {
1669 case HARDWARE_ERROR:
1670 case MEDIUM_ERROR:
af55ff67 1671 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1672 break;
1673 case RECOVERED_ERROR:
af55ff67
MP		 1674 good_bytes = scsi_bufflen(SCpnt);
1675 break;
10dab226
JW		 1676 case NO_SENSE:
1677 /* This indicates a false check condition, so ignore it. An
1678 * unknown amount of data was transferred so treat it as an
1679 * error.
1680 */
1681 scsi_print_sense("sd", SCpnt);
1682 SCpnt->result = 0;
1683 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1684 break;
c98a0eb0
MP		 1685 case ABORTED_COMMAND:
1686 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1687 good_bytes = sd_completed_bytes(SCpnt);
1688 break;
1689 case ILLEGAL_REQUEST:
1690 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1691 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1692 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1693 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1694 switch (op) {
1695 case UNMAP:
1696 sd_config_discard(sdkp, SD_LBP_DISABLE);
1697 break;
1698 case WRITE_SAME_16:
1699 case WRITE_SAME:
1700 if (unmap)
1701 sd_config_discard(sdkp, SD_LBP_DISABLE);
1702 else {
1703 sdkp->device->no_write_same = 1;
1704 sd_config_write_same(sdkp);
1705
1706 good_bytes = 0;
1707 req->__data_len = blk_rq_bytes(req);
1708 req->cmd_flags |= REQ_QUIET;
1709 }
1710 }
1711 }
03aba2f7
LT		 1712 break;
1713 default:
1714 break;
1da177e4 1715 }
03aba2f7 1716 out:
af55ff67
MP		 1717 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1718 sd_dif_complete(SCpnt, good_bytes);
1719
7b3d9545 1720 return good_bytes;
1da177e4
LT		 1721}
1722
1da177e4
LT		 1723/*
1724 * spinup disk - called only in sd_revalidate_disk()
1725 */
1726static void
e73aec82 1727sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1728{
1da177e4 1729 unsigned char cmd[10];
4451e472 1730 unsigned long spintime_expire = 0;
1da177e4
LT		 1731 int retries, spintime;
1732 unsigned int the_result;
1733 struct scsi_sense_hdr sshdr;
1734 int sense_valid = 0;
1735
1736 spintime = 0;
1737
1738 /* Spin up drives, as required. Only do this at boot time */
1739 /* Spinup needs to be done for module loads too. */
1740 do {
1741 retries = 0;
1742
1743 do {
1744 cmd[0] = TEST_UNIT_READY;
1745 memset((void *) &cmd[1], 0, 9);
1746
ea73a9f2
JB		 1747 the_result = scsi_execute_req(sdkp->device, cmd,
1748 DMA_NONE, NULL, 0,
1749 &sshdr, SD_TIMEOUT,
f4f4e47e 1750 SD_MAX_RETRIES, NULL);
1da177e4 1751
b4d38e38
AS		 1752 /*
1753 * If the drive has indicated to us that it
1754 * doesn't have any media in it, don't bother
1755 * with any more polling.
1756 */
1757 if (media_not_present(sdkp, &sshdr))
1758 return;
1759
1da177e4 1760 if (the_result)
ea73a9f2 1761 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1762 retries++;
1763 } while (retries < 3 &&
1764 (!scsi_status_is_good(the_result) ||
1765 ((driver_byte(the_result) & DRIVER_SENSE) &&
1766 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1767
1da177e4
LT		 1768 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1769 /* no sense, TUR either succeeded or failed
1770 * with a status error */
e73aec82
MP		 1771 if(!spintime && !scsi_status_is_good(the_result)) {
1772 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1773 sd_print_result(sdkp, the_result);
1774 }
1da177e4
LT		 1775 break;
1776 }
1777
1778 /*
1779 * The device does not want the automatic start to be issued.
1780 */
33dd6f92 1781 if (sdkp->device->no_start_on_add)
1da177e4 1782 break;
1da177e4 1783
33dd6f92
MW		 1784 if (sense_valid && sshdr.sense_key == NOT_READY) {
1785 if (sshdr.asc == 4 && sshdr.ascq == 3)
1786 break; /* manual intervention required */
1787 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1788 break; /* standby */
1789 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1790 break; /* unavailable */
1791 /*
1792 * Issue command to spin up drive when not ready
1793 */
1da177e4 1794 if (!spintime) {
e73aec82 1795 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1796 cmd[0] = START_STOP;
1797 cmd[1] = 1; /* Return immediately */
1798 memset((void *) &cmd[2], 0, 8);
1799 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1800 if (sdkp->device->start_stop_pwr_cond)
1801 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1802 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1803 NULL, 0, &sshdr,
f4f4e47e
FT		 1804 SD_TIMEOUT, SD_MAX_RETRIES,
1805 NULL);
4451e472
AS		 1806 spintime_expire = jiffies + 100 * HZ;
1807 spintime = 1;
1da177e4 1808 }
1da177e4
LT		 1809 /* Wait 1 second for next try */
1810 msleep(1000);
1811 printk(".");
4451e472
AS		 1812
1813 /*
1814 * Wait for USB flash devices with slow firmware.
1815 * Yes, this sense key/ASC combination shouldn't
1816 * occur here. It's characteristic of these devices.
1817 */
1818 } else if (sense_valid &&
1819 sshdr.sense_key == UNIT_ATTENTION &&
1820 sshdr.asc == 0x28) {
1821 if (!spintime) {
1822 spintime_expire = jiffies + 5 * HZ;
1823 spintime = 1;
1824 }
1825 /* Wait 1 second for next try */
1826 msleep(1000);
1da177e4
LT		 1827 } else {
1828 /* we don't understand the sense code, so it's
1829 * probably pointless to loop */
1830 if(!spintime) {
e73aec82
MP		 1831 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1832 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1833 }
1834 break;
1835 }
1836
4451e472 1837 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1838
1839 if (spintime) {
1840 if (scsi_status_is_good(the_result))
1841 printk("ready\n");
1842 else
1843 printk("not responding...\n");
1844 }
1845}
1846
e0597d70
MP		 1847
1848/*
1849 * Determine whether disk supports Data Integrity Field.
1850 */
fe542396 1851static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1852{
1853 struct scsi_device *sdp = sdkp->device;
1854 u8 type;
fe542396 1855 int ret = 0;
e0597d70
MP		 1856
1857 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1858 return ret;
35e1a5d9
MP		 1859
1860 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1861
fe542396
MP		 1862 if (type > SD_DIF_TYPE3_PROTECTION)
1863 ret = -ENODEV;
1864 else if (scsi_host_dif_capable(sdp->host, type))
1865 ret = 1;
1866
1867 if (sdkp->first_scan || type != sdkp->protection_type)
1868 switch (ret) {
1869 case -ENODEV:
1870 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1871 " protection type %u. Disabling disk!\n",
1872 type);
1873 break;
1874 case 1:
1875 sd_printk(KERN_NOTICE, sdkp,
1876 "Enabling DIF Type %u protection\n", type);
1877 break;
1878 case 0:
1879 sd_printk(KERN_NOTICE, sdkp,
1880 "Disabling DIF Type %u protection\n", type);
1881 break;
1882 }
e0597d70 1883
be922f47
MP		 1884 sdkp->protection_type = type;
1885
fe542396 1886 return ret;
e0597d70
MP		 1887}
1888
0da205e0
MW		 1889static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1890 struct scsi_sense_hdr *sshdr, int sense_valid,
1891 int the_result)
1892{
1893 sd_print_result(sdkp, the_result);
1894 if (driver_byte(the_result) & DRIVER_SENSE)
1895 sd_print_sense_hdr(sdkp, sshdr);
1896 else
1897 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1898
1899 /*
1900 * Set dirty bit for removable devices if not ready -
1901 * sometimes drives will not report this properly.
1902 */
1903 if (sdp->removable &&
1904 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1905 set_media_not_present(sdkp);
0da205e0
MW		 1906
1907 /*
1908 * We used to set media_present to 0 here to indicate no media
1909 * in the drive, but some drives fail read capacity even with
1910 * media present, so we can't do that.
1911 */
1912 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1913}
1914
1915#define RC16_LEN 32
1916#if RC16_LEN > SD_BUF_SIZE
1917#error RC16_LEN must not be more than SD_BUF_SIZE
1918#endif
1919
3233ac19
JB		 1920#define READ_CAPACITY_RETRIES_ON_RESET 10
1921
0da205e0
MW		 1922static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1923 unsigned char *buffer)
ea73a9f2 1924{
1da177e4 1925 unsigned char cmd[16];
1da177e4
LT		 1926 struct scsi_sense_hdr sshdr;
1927 int sense_valid = 0;
0da205e0 1928 int the_result;
3233ac19 1929 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1930 unsigned int alignment;
0da205e0
MW		 1931 unsigned long long lba;
1932 unsigned sector_size;
1da177e4 1933
5ce524bd
HG		 1934 if (sdp->no_read_capacity_16)
1935 return -EINVAL;
1936
1da177e4 1937 do {
0da205e0
MW		 1938 memset(cmd, 0, 16);
1939 cmd[0] = SERVICE_ACTION_IN;
1940 cmd[1] = SAI_READ_CAPACITY_16;
1941 cmd[13] = RC16_LEN;
1942 memset(buffer, 0, RC16_LEN);
1943
ea73a9f2 1944 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1945 buffer, RC16_LEN, &sshdr,
1946 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1947
ea73a9f2 1948 if (media_not_present(sdkp, &sshdr))
0da205e0 1949 return -ENODEV;
1da177e4 1950
2b301307 1951 if (the_result) {
ea73a9f2 1952 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1953 if (sense_valid &&
1954 sshdr.sense_key == ILLEGAL_REQUEST &&
1955 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1956 sshdr.ascq == 0x00)
1957 /* Invalid Command Operation Code or
1958 * Invalid Field in CDB, just retry
1959 * silently with RC10 */
1960 return -EINVAL;
3233ac19
JB		 1961 if (sense_valid &&
1962 sshdr.sense_key == UNIT_ATTENTION &&
1963 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1964 /* Device reset might occur several times,
1965 * give it one more chance */
1966 if (--reset_retries > 0)
1967 continue;
2b301307 1968 }
1da177e4
LT		 1969 retries--;
1970
1971 } while (the_result && retries);
1972
0da205e0 1973 if (the_result) {
e73aec82 1974 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 1975 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1976 return -EINVAL;
1977 }
e73aec82 1978
8f76d151
DH		 1979 sector_size = get_unaligned_be32(&buffer[8]);
1980 lba = get_unaligned_be64(&buffer[0]);
0da205e0 1981
fe542396
MP		 1982 if (sd_read_protection_type(sdkp, buffer) < 0) {
1983 sdkp->capacity = 0;
1984 return -ENODEV;
1985 }
0da205e0
MW		 1986
1987 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1988 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1989 "kernel compiled with support for large block "
1990 "devices.\n");
1991 sdkp->capacity = 0;
1992 return -EOVERFLOW;
1993 }
1994
ea09bcc9 1995 /* Logical blocks per physical block exponent */
526f7c79 1996 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 1997
1998 /* Lowest aligned logical block */
1999 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2000 blk_queue_alignment_offset(sdp->request_queue, alignment);
2001 if (alignment && sdkp->first_scan)
2002 sd_printk(KERN_NOTICE, sdkp,
2003 "physical block alignment offset: %u\n", alignment);
2004
c98a0eb0
MP		 2005 if (buffer[14] & 0x80) { /* LBPME */
2006 sdkp->lbpme = 1;
e339c1a7 2007
c98a0eb0
MP		 2008 if (buffer[14] & 0x40) /* LBPRZ */
2009 sdkp->lbprz = 1;
e339c1a7 2010
c98a0eb0 2011 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2012 }
2013
0da205e0
MW		 2014 sdkp->capacity = lba + 1;
2015 return sector_size;
2016}
2017
2018static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2019 unsigned char *buffer)
2020{
2021 unsigned char cmd[16];
2022 struct scsi_sense_hdr sshdr;
2023 int sense_valid = 0;
2024 int the_result;
3233ac19 2025 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2026 sector_t lba;
2027 unsigned sector_size;
2028
2029 do {
2030 cmd[0] = READ_CAPACITY;
2031 memset(&cmd[1], 0, 9);
2032 memset(buffer, 0, 8);
2033
2034 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2035 buffer, 8, &sshdr,
2036 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2037
2038 if (media_not_present(sdkp, &sshdr))
2039 return -ENODEV;
2040
3233ac19 2041 if (the_result) {
0da205e0 2042 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2043 if (sense_valid &&
2044 sshdr.sense_key == UNIT_ATTENTION &&
2045 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2046 /* Device reset might occur several times,
2047 * give it one more chance */
2048 if (--reset_retries > 0)
2049 continue;
2050 }
0da205e0
MW		 2051 retries--;
2052
2053 } while (the_result && retries);
2054
2055 if (the_result) {
2056 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2057 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2058 return -EINVAL;
2059 }
2060
8f76d151
DH		 2061 sector_size = get_unaligned_be32(&buffer[4]);
2062 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2063
5ce524bd
HG		 2064 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2065 /* Some buggy (usb cardreader) devices return an lba of
2066 0xffffffff when the want to report a size of 0 (with
2067 which they really mean no media is present) */
2068 sdkp->capacity = 0;
5cc10350 2069 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2070 return sector_size;
2071 }
2072
0da205e0
MW		 2073 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2074 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2075 "kernel compiled with support for large block "
2076 "devices.\n");
2077 sdkp->capacity = 0;
2078 return -EOVERFLOW;
2079 }
2080
2081 sdkp->capacity = lba + 1;
526f7c79 2082 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2083 return sector_size;
2084}
2085
2b301307
MW		 2086static int sd_try_rc16_first(struct scsi_device *sdp)
2087{
f87146bb
HR		 2088 if (sdp->host->max_cmd_len < 16)
2089 return 0;
6a0bdffa
AS		 2090 if (sdp->try_rc_10_first)
2091 return 0;
2b301307
MW		 2092 if (sdp->scsi_level > SCSI_SPC_2)
2093 return 1;
2094 if (scsi_device_protection(sdp))
2095 return 1;
2096 return 0;
2097}
2098
0da205e0
MW		 2099/*
2100 * read disk capacity
2101 */
2102static void
2103sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2104{
2105 int sector_size;
2106 struct scsi_device *sdp = sdkp->device;
70a9b873 2107 sector_t old_capacity = sdkp->capacity;
0da205e0 2108
2b301307 2109 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2110 sector_size = read_capacity_16(sdkp, sdp, buffer);
2111 if (sector_size == -EOVERFLOW)
1da177e4 2112 goto got_data;
2b301307
MW		 2113 if (sector_size == -ENODEV)
2114 return;
2115 if (sector_size < 0)
2116 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2117 if (sector_size < 0)
2118 return;
1da177e4 2119 } else {
0da205e0
MW		 2120 sector_size = read_capacity_10(sdkp, sdp, buffer);
2121 if (sector_size == -EOVERFLOW)
2122 goto got_data;
2123 if (sector_size < 0)
2124 return;
2125 if ((sizeof(sdkp->capacity) > 4) &&
2126 (sdkp->capacity > 0xffffffffULL)) {
2127 int old_sector_size = sector_size;
2128 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2129 "Trying to use READ CAPACITY(16).\n");
2130 sector_size = read_capacity_16(sdkp, sdp, buffer);
2131 if (sector_size < 0) {
2132 sd_printk(KERN_NOTICE, sdkp,
2133 "Using 0xffffffff as device size\n");
2134 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2135 sector_size = old_sector_size;
2136 goto got_data;
2137 }
2138 }
2139 }
1da177e4 2140
5c211caa
AS		 2141 /* Some devices are known to return the total number of blocks,
2142 * not the highest block number. Some devices have versions
2143 * which do this and others which do not. Some devices we might
2144 * suspect of doing this but we don't know for certain.
2145 *
2146 * If we know the reported capacity is wrong, decrement it. If
2147 * we can only guess, then assume the number of blocks is even
2148 * (usually true but not always) and err on the side of lowering
2149 * the capacity.
2150 */
2151 if (sdp->fix_capacity ||
2152 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2153 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2154 "from its reported value: %llu\n",
2155 (unsigned long long) sdkp->capacity);
1da177e4 2156 --sdkp->capacity;
61bf54b7
ON		 2157 }
2158
1da177e4
LT		 2159got_data:
2160 if (sector_size == 0) {
2161 sector_size = 512;
e73aec82
MP		 2162 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2163 "assuming 512.\n");
1da177e4
LT		 2164 }
2165
2166 if (sector_size != 512 &&
2167 sector_size != 1024 &&
2168 sector_size != 2048 &&
2169 sector_size != 4096 &&
2170 sector_size != 256) {
e73aec82
MP		 2171 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2172 sector_size);
1da177e4
LT		 2173 /*
2174 * The user might want to re-format the drive with
2175 * a supported sectorsize. Once this happens, it
2176 * would be relatively trivial to set the thing up.
2177 * For this reason, we leave the thing in the table.
2178 */
2179 sdkp->capacity = 0;
2180 /*
2181 * set a bogus sector size so the normal read/write
2182 * logic in the block layer will eventually refuse any
2183 * request on this device without tripping over power
2184 * of two sector size assumptions
2185 */
2186 sector_size = 512;
2187 }
e1defc4f 2188 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2189
1da177e4 2190 {
7404ad3b 2191 char cap_str_2[10], cap_str_10[10];
520a2c27 2192 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2193
7404ad3b
JB		 2194 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2195 sizeof(cap_str_2));
2196 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2197 sizeof(cap_str_10));
1da177e4 2198
ea09bcc9 2199 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2200 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2201 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2202 (unsigned long long)sdkp->capacity,
2203 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2204
526f7c79 2205 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2206 sd_printk(KERN_NOTICE, sdkp,
2207 "%u-byte physical blocks\n",
526f7c79 2208 sdkp->physical_block_size);
ea09bcc9 2209 }
1da177e4
LT		 2210 }
2211
53ad570b
JH		 2212 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2213
1da177e4
LT		 2214 /* Rescale capacity to 512-byte units */
2215 if (sector_size == 4096)
2216 sdkp->capacity <<= 3;
2217 else if (sector_size == 2048)
2218 sdkp->capacity <<= 2;
2219 else if (sector_size == 1024)
2220 sdkp->capacity <<= 1;
2221 else if (sector_size == 256)
2222 sdkp->capacity >>= 1;
2223
526f7c79
MP		 2224 blk_queue_physical_block_size(sdp->request_queue,
2225 sdkp->physical_block_size);
1da177e4
LT		 2226 sdkp->device->sector_size = sector_size;
2227}
2228
2229/* called with buffer of length 512 */
2230static inline int
ea73a9f2
JB		 2231sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2232 unsigned char *buffer, int len, struct scsi_mode_data *data,
2233 struct scsi_sense_hdr *sshdr)
1da177e4 2234{
ea73a9f2 2235 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2236 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2237 sshdr);
1da177e4
LT		 2238}
2239
2240/*
2241 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2242 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2243 */
2244static void
e73aec82 2245sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2246{
1da177e4 2247 int res;
ea73a9f2 2248 struct scsi_device *sdp = sdkp->device;
1da177e4 2249 struct scsi_mode_data data;
70a9b873 2250 int old_wp = sdkp->write_prot;
1da177e4
LT		 2251
2252 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2253 if (sdp->skip_ms_page_3f) {
e73aec82 2254 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2255 return;
2256 }
2257
ea73a9f2
JB		 2258 if (sdp->use_192_bytes_for_3f) {
2259 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2260 } else {
2261 /*
2262 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2263 * We have to start carefully: some devices hang if we ask
2264 * for more than is available.
2265 */
ea73a9f2 2266 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2267
2268 /*
2269 * Second attempt: ask for page 0 When only page 0 is
2270 * implemented, a request for page 3F may return Sense Key
2271 * 5: Illegal Request, Sense Code 24: Invalid field in
2272 * CDB.
2273 */
2274 if (!scsi_status_is_good(res))
ea73a9f2 2275 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2276
2277 /*
2278 * Third attempt: ask 255 bytes, as we did earlier.
2279 */
2280 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2281 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2282 &data, NULL);
1da177e4
LT		 2283 }
2284
2285 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2286 sd_printk(KERN_WARNING, sdkp,
2287 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2288 } else {
2289 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2290 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2291 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2292 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2293 sdkp->write_prot ? "on" : "off");
2294 sd_printk(KERN_DEBUG, sdkp,
2295 "Mode Sense: %02x %02x %02x %02x\n",
2296 buffer[0], buffer[1], buffer[2], buffer[3]);
2297 }
1da177e4
LT		 2298 }
2299}
2300
2301/*
2302 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2303 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2304 */
2305static void
e73aec82 2306sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2307{
1da177e4 2308 int len = 0, res;
ea73a9f2 2309 struct scsi_device *sdp = sdkp->device;
1da177e4 2310
631e8a13
AV		 2311 int dbd;
2312 int modepage;
0bcaa111 2313 int first_len;
1da177e4
LT		 2314 struct scsi_mode_data data;
2315 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2316 int old_wce = sdkp->WCE;
2317 int old_rcd = sdkp->RCD;
2318 int old_dpofua = sdkp->DPOFUA;
1da177e4 2319
39c60a09
JB		 2320
2321 if (sdkp->cache_override)
2322 return;
2323
0bcaa111
LT		 2324 first_len = 4;
2325 if (sdp->skip_ms_page_8) {
2326 if (sdp->type == TYPE_RBC)
2327 goto defaults;
2328 else {
2329 if (sdp->skip_ms_page_3f)
2330 goto defaults;
2331 modepage = 0x3F;
2332 if (sdp->use_192_bytes_for_3f)
2333 first_len = 192;
2334 dbd = 0;
2335 }
2336 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2337 modepage = 6;
2338 dbd = 8;
2339 } else {
2340 modepage = 8;
2341 dbd = 0;
2342 }
2343
1da177e4 2344 /* cautiously ask */
0bcaa111
LT		 2345 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2346 &data, &sshdr);
1da177e4
LT		 2347
2348 if (!scsi_status_is_good(res))
2349 goto bad_sense;
2350
6d73c851
AV		 2351 if (!data.header_length) {
2352 modepage = 6;
0bcaa111 2353 first_len = 0;
e73aec82 2354 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2355 }
2356
1da177e4
LT		 2357 /* that went OK, now ask for the proper length */
2358 len = data.length;
2359
2360 /*
2361 * We're only interested in the first three bytes, actually.
2362 * But the data cache page is defined for the first 20.
2363 */
2364 if (len < 3)
2365 goto bad_sense;
0bcaa111
LT		 2366 else if (len > SD_BUF_SIZE) {
2367 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2368 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2369 len = SD_BUF_SIZE;
2370 }
2371 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2372 len = 192;
1da177e4
LT		 2373
2374 /* Get the data */
0bcaa111
LT		 2375 if (len > first_len)
2376 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2377 &data, &sshdr);
1da177e4
LT		 2378
2379 if (scsi_status_is_good(res)) {
631e8a13 2380 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2381
0bcaa111
LT		 2382 while (offset < len) {
2383 u8 page_code = buffer[offset] & 0x3F;
2384 u8 spf = buffer[offset] & 0x40;
2385
2386 if (page_code == 8 || page_code == 6) {
2387 /* We're interested only in the first 3 bytes.
2388 */
2389 if (len - offset <= 2) {
2390 sd_printk(KERN_ERR, sdkp, "Incomplete "
2391 "mode parameter data\n");
2392 goto defaults;
2393 } else {
2394 modepage = page_code;
2395 goto Page_found;
2396 }
2397 } else {
2398 /* Go to the next page */
2399 if (spf && len - offset > 3)
2400 offset += 4 + (buffer[offset+2] << 8) +
2401 buffer[offset+3];
2402 else if (!spf && len - offset > 1)
2403 offset += 2 + buffer[offset+1];
2404 else {
2405 sd_printk(KERN_ERR, sdkp, "Incomplete "
2406 "mode parameter data\n");
2407 goto defaults;
2408 }
2409 }
48970800
AV		 2410 }
2411
13915e20
AS		 2412 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2413 goto defaults;
2414
0bcaa111 2415 Page_found:
631e8a13
AV		 2416 if (modepage == 8) {
2417 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2418 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2419 } else {
2420 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2421 sdkp->RCD = 0;
2422 }
1da177e4 2423
007365ad
TH		 2424 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2425 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2426 sd_printk(KERN_NOTICE, sdkp,
2427 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2428 sdkp->DPOFUA = 0;
2429 }
2430
70a9b873
MP		 2431 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2432 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2433 sd_printk(KERN_NOTICE, sdkp,
2434 "Write cache: %s, read cache: %s, %s\n",
2435 sdkp->WCE ? "enabled" : "disabled",
2436 sdkp->RCD ? "disabled" : "enabled",
2437 sdkp->DPOFUA ? "supports DPO and FUA"
2438 : "doesn't support DPO or FUA");
1da177e4
LT		 2439
2440 return;
2441 }
2442
2443bad_sense:
ea73a9f2 2444 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2445 sshdr.sense_key == ILLEGAL_REQUEST &&
2446 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2447 /* Invalid field in CDB */
2448 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2449 else
e73aec82 2450 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2451
2452defaults:
b81478d8
NJ		 2453 if (sdp->wce_default_on) {
2454 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2455 sdkp->WCE = 1;
2456 } else {
2457 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2458 sdkp->WCE = 0;
2459 }
1da177e4 2460 sdkp->RCD = 0;
48970800 2461 sdkp->DPOFUA = 0;
1da177e4
LT		 2462}
2463
e0597d70
MP		 2464/*
2465 * The ATO bit indicates whether the DIF application tag is available
2466 * for use by the operating system.
2467 */
439d77f7 2468static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2469{
2470 int res, offset;
2471 struct scsi_device *sdp = sdkp->device;
2472 struct scsi_mode_data data;
2473 struct scsi_sense_hdr sshdr;
2474
2475 if (sdp->type != TYPE_DISK)
2476 return;
2477
2478 if (sdkp->protection_type == 0)
2479 return;
2480
2481 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2482 SD_MAX_RETRIES, &data, &sshdr);
2483
2484 if (!scsi_status_is_good(res) || !data.header_length ||
2485 data.length < 6) {
2486 sd_printk(KERN_WARNING, sdkp,
2487 "getting Control mode page failed, assume no ATO\n");
2488
2489 if (scsi_sense_valid(&sshdr))
2490 sd_print_sense_hdr(sdkp, &sshdr);
2491
2492 return;
2493 }
2494
2495 offset = data.header_length + data.block_descriptor_length;
2496
2497 if ((buffer[offset] & 0x3f) != 0x0a) {
2498 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2499 return;
2500 }
2501
2502 if ((buffer[offset + 5] & 0x80) == 0)
2503 return;
2504
2505 sdkp->ATO = 1;
2506
2507 return;
2508}
2509
d11b6916
MP		 2510/**
2511 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2512 * @disk: disk to query
2513 */
2514static void sd_read_block_limits(struct scsi_disk *sdkp)
2515{
2516 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2517 const int vpd_len = 64;
e3deec09 2518 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2519
e3deec09
JB		 2520 if (!buffer ||
2521 /* Block Limits VPD */
2522 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2523 goto out;
d11b6916
MP		 2524
2525 blk_queue_io_min(sdkp->disk->queue,
2526 get_unaligned_be16(&buffer[6]) * sector_sz);
2527 blk_queue_io_opt(sdkp->disk->queue,
2528 get_unaligned_be32(&buffer[12]) * sector_sz);
2529
c98a0eb0
MP		 2530 if (buffer[3] == 0x3c) {
2531 unsigned int lba_count, desc_count;
e339c1a7 2532
5db44863 2533 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2534
c98a0eb0 2535 if (!sdkp->lbpme)
045d3fe7 2536 goto out;
045d3fe7 2537
c98a0eb0
MP		 2538 lba_count = get_unaligned_be32(&buffer[20]);
2539 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2540
c98a0eb0
MP		 2541 if (lba_count && desc_count)
2542 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2543
c98a0eb0 2544 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2545
2546 if (buffer[32] & 0x80)
c98a0eb0 2547 sdkp->unmap_alignment =
e339c1a7 2548 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2549
2550 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2551
2552 if (sdkp->max_unmap_blocks)
2553 sd_config_discard(sdkp, SD_LBP_UNMAP);
2554 else
2555 sd_config_discard(sdkp, SD_LBP_WS16);
2556
2557 } else { /* LBP VPD page tells us what to use */
2558
2559 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2560 sd_config_discard(sdkp, SD_LBP_UNMAP);
2561 else if (sdkp->lbpws)
2562 sd_config_discard(sdkp, SD_LBP_WS16);
2563 else if (sdkp->lbpws10)
2564 sd_config_discard(sdkp, SD_LBP_WS10);
2565 else
2566 sd_config_discard(sdkp, SD_LBP_DISABLE);
2567 }
e339c1a7
MP		 2568 }
2569
e3deec09 2570 out:
d11b6916
MP		 2571 kfree(buffer);
2572}
2573
3821d768
MP		 2574/**
2575 * sd_read_block_characteristics - Query block dev. characteristics
2576 * @disk: disk to query
2577 */
2578static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2579{
e3deec09 2580 unsigned char *buffer;
3821d768 2581 u16 rot;
bb2d3de1 2582 const int vpd_len = 64;
3821d768 2583
e3deec09 2584 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2585
e3deec09
JB		 2586 if (!buffer ||
2587 /* Block Device Characteristics VPD */
2588 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2589 goto out;
3821d768
MP		 2590
2591 rot = get_unaligned_be16(&buffer[4]);
2592
2593 if (rot == 1)
2594 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2595
e3deec09 2596 out:
3821d768
MP		 2597 kfree(buffer);
2598}
2599
045d3fe7 2600/**
c98a0eb0 2601 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2602 * @disk: disk to query
2603 */
c98a0eb0 2604static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2605{
2606 unsigned char *buffer;
2607 const int vpd_len = 8;
2608
c98a0eb0 2609 if (sdkp->lbpme == 0)
045d3fe7
MP		 2610 return;
2611
2612 buffer = kmalloc(vpd_len, GFP_KERNEL);
2613
2614 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2615 goto out;
2616
c98a0eb0
MP		 2617 sdkp->lbpvpd = 1;
2618 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2619 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2620 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2621
2622 out:
2623 kfree(buffer);
2624}
2625
5db44863
MP		 2626static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2627{
98dcc294
MP		 2628 struct scsi_device *sdev = sdkp->device;
2629
8562d028
MP		 2630 if (sdev->host->no_write_same) {
2631 sdev->no_write_same = 1;
2632
2633 return;
2634 }
2635
98dcc294 2636 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
af313b03
BS		 2637 /* too large values might cause issues with arcmsr */
2638 int vpd_buf_len = 64;
2639
98dcc294
MP		 2640 sdev->no_report_opcodes = 1;
2641
2642 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2643 * CODES is unsupported and the device has an ATA
2644 * Information VPD page (SAT).
2645 */
af313b03 2646 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
98dcc294
MP		 2647 sdev->no_write_same = 1;
2648 }
2649
2650 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
5db44863 2651 sdkp->ws16 = 1;
98dcc294
MP		 2652
2653 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2654 sdkp->ws10 = 1;
5db44863
MP		 2655}
2656
ffd4bc2a
MP		 2657static int sd_try_extended_inquiry(struct scsi_device *sdp)
2658{
2659 /*
2660 * Although VPD inquiries can go to SCSI-2 type devices,
2661 * some USB ones crash on receiving them, and the pages
2662 * we currently ask for are for SPC-3 and beyond
2663 */
09b6b51b 2664 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2665 return 1;
2666 return 0;
2667}
2668
1da177e4
LT		 2669/**
2670 * sd_revalidate_disk - called the first time a new disk is seen,
2671 * performs disk spin up, read_capacity, etc.
2672 * @disk: struct gendisk we care about
2673 **/
2674static int sd_revalidate_disk(struct gendisk *disk)
2675{
2676 struct scsi_disk *sdkp = scsi_disk(disk);
2677 struct scsi_device *sdp = sdkp->device;
1da177e4 2678 unsigned char *buffer;
4913efe4 2679 unsigned flush = 0;
1da177e4 2680
fa0d34be
MP		 2681 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2682 "sd_revalidate_disk\n"));
1da177e4
LT		 2683
2684 /*
2685 * If the device is offline, don't try and read capacity or any
2686 * of the other niceties.
2687 */
2688 if (!scsi_device_online(sdp))
2689 goto out;
2690
a6123f14 2691 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2692 if (!buffer) {
e73aec82
MP		 2693 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2694 "allocation failure.\n");
ea73a9f2 2695 goto out;
1da177e4
LT		 2696 }
2697
e73aec82 2698 sd_spinup_disk(sdkp);
1da177e4
LT		 2699
2700 /*
2701 * Without media there is no reason to ask; moreover, some devices
2702 * react badly if we do.
2703 */
2704 if (sdkp->media_present) {
e73aec82 2705 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2706
2707 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2708 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2709 sd_read_block_limits(sdkp);
2710 sd_read_block_characteristics(sdkp);
2711 }
2712
e73aec82
MP		 2713 sd_read_write_protect_flag(sdkp, buffer);
2714 sd_read_cache_type(sdkp, buffer);
e0597d70 2715 sd_read_app_tag_own(sdkp, buffer);
5db44863 2716 sd_read_write_same(sdkp, buffer);
1da177e4 2717 }
461d4e90 2718
70a9b873
MP		 2719 sdkp->first_scan = 0;
2720
461d4e90
TH		 2721 /*
2722 * We now have all cache related info, determine how we deal
4913efe4 2723 * with flush requests.
461d4e90 2724 */
4913efe4
TH		 2725 if (sdkp->WCE) {
2726 flush |= REQ_FLUSH;
2727 if (sdkp->DPOFUA)
2728 flush |= REQ_FUA;
2729 }
461d4e90 2730
4913efe4 2731 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2732
1da177e4 2733 set_capacity(disk, sdkp->capacity);
5db44863 2734 sd_config_write_same(sdkp);
1da177e4
LT		 2735 kfree(buffer);
2736
1da177e4
LT		 2737 out:
2738 return 0;
2739}
2740
72ec24bd
TH		 2741/**
2742 * sd_unlock_native_capacity - unlock native capacity
2743 * @disk: struct gendisk to set capacity for
2744 *
2745 * Block layer calls this function if it detects that partitions
2746 * on @disk reach beyond the end of the device. If the SCSI host
2747 * implements ->unlock_native_capacity() method, it's invoked to
2748 * give it a chance to adjust the device capacity.
2749 *
2750 * CONTEXT:
2751 * Defined by block layer. Might sleep.
2752 */
2753static void sd_unlock_native_capacity(struct gendisk *disk)
2754{
2755 struct scsi_device *sdev = scsi_disk(disk)->device;
2756
2757 if (sdev->host->hostt->unlock_native_capacity)
2758 sdev->host->hostt->unlock_native_capacity(sdev);
2759}
2760
3e1a7ff8
TH		 2761/**
2762 * sd_format_disk_name - format disk name
2763 * @prefix: name prefix - ie. "sd" for SCSI disks
2764 * @index: index of the disk to format name for
2765 * @buf: output buffer
2766 * @buflen: length of the output buffer
2767 *
2768 * SCSI disk names starts at sda. The 26th device is sdz and the
2769 * 27th is sdaa. The last one for two lettered suffix is sdzz
2770 * which is followed by sdaaa.
2771 *
2772 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2773 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2774 * determined using similar method as 26 base conversion with the
2775 * index shifted -1 after each digit is computed.
2776 *
2777 * CONTEXT:
2778 * Don't care.
2779 *
2780 * RETURNS:
2781 * 0 on success, -errno on failure.
2782 */
2783static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2784{
2785 const int base = 'z' - 'a' + 1;
2786 char *begin = buf + strlen(prefix);
2787 char *end = buf + buflen;
2788 char *p;
2789 int unit;
2790
2791 p = end - 1;
2792 *p = '\0';
2793 unit = base;
2794 do {
2795 if (p == begin)
2796 return -EINVAL;
2797 *--p = 'a' + (index % unit);
2798 index = (index / unit) - 1;
2799 } while (index >= 0);
2800
2801 memmove(begin, p, end - p);
2802 memcpy(buf, prefix, strlen(prefix));
2803
2804 return 0;
2805}
2806
4ace92fc
AV		 2807/*
2808 * The asynchronous part of sd_probe
2809 */
2810static void sd_probe_async(void *data, async_cookie_t cookie)
2811{
2812 struct scsi_disk *sdkp = data;
2813 struct scsi_device *sdp;
2814 struct gendisk *gd;
2815 u32 index;
2816 struct device *dev;
2817
2818 sdp = sdkp->device;
2819 gd = sdkp->disk;
2820 index = sdkp->index;
2821 dev = &sdp->sdev_gendev;
2822
1a03ae0f
MR		 2823 gd->major = sd_major((index & 0xf0) >> 4);
2824 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2825 gd->minors = SD_MINORS;
2826
4ace92fc
AV		 2827 gd->fops = &sd_fops;
2828 gd->private_data = &sdkp->driver;
2829 gd->queue = sdkp->device->request_queue;
2830
70a9b873
MP		 2831 /* defaults, until the device tells us otherwise */
2832 sdp->sector_size = 512;
2833 sdkp->capacity = 0;
2834 sdkp->media_present = 1;
2835 sdkp->write_prot = 0;
39c60a09 2836 sdkp->cache_override = 0;
70a9b873
MP		 2837 sdkp->WCE = 0;
2838 sdkp->RCD = 0;
2839 sdkp->ATO = 0;
2840 sdkp->first_scan = 1;
18a4d0a2 2841 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2842
4ace92fc
AV		 2843 sd_revalidate_disk(gd);
2844
2845 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2846 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2847
2848 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2849 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2850 if (sdp->removable) {
4ace92fc 2851 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2852 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2853 }
4ace92fc 2854
da0d4136 2855 blk_pm_runtime_init(sdp->request_queue, dev);
4ace92fc 2856 add_disk(gd);
fe542396
MP		 2857 if (sdkp->capacity)
2858 sd_dif_config_host(sdkp);
4ace92fc 2859
3821d768
MP		 2860 sd_revalidate_disk(gd);
2861
4ace92fc
AV		 2862 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2863 sdp->removable ? "removable " : "");
478a8a05 2864 scsi_autopm_put_device(sdp);
ea038f63 2865 put_device(&sdkp->dev);
4ace92fc
AV		 2866}
2867
1da177e4
LT		 2868/**
2869 * sd_probe - called during driver initialization and whenever a
2870 * new scsi device is attached to the system. It is called once
2871 * for each scsi device (not just disks) present.
2872 * @dev: pointer to device object
2873 *
2874 * Returns 0 if successful (or not interested in this scsi device
2875 * (e.g. scanner)); 1 when there is an error.
2876 *
2877 * Note: this function is invoked from the scsi mid-level.
2878 * This function sets up the mapping between a given
2879 * <host,channel,id,lun> (found in sdp) and new device name
2880 * (e.g. /dev/sda). More precisely it is the block device major
2881 * and minor number that is chosen here.
2882 *
2db93ce8
PU		 2883 * Assume sd_probe is not re-entrant (for time being)
2884 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2885 **/
2886static int sd_probe(struct device *dev)
2887{
2888 struct scsi_device *sdp = to_scsi_device(dev);
2889 struct scsi_disk *sdkp;
2890 struct gendisk *gd;
439d77f7 2891 int index;
1da177e4
LT		 2892 int error;
2893
2894 error = -ENODEV;
631e8a13 2895 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2896 goto out;
2897
9ccfc756 2898 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2899 "sd_probe\n"));
1da177e4
LT		 2900
2901 error = -ENOMEM;
24669f75 2902 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2903 if (!sdkp)
2904 goto out;
2905
689d6fac 2906 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2907 if (!gd)
2908 goto out_free;
2909
f27bac27
TH		 2910 do {
2911 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2912 goto out_put;
1da177e4 2913
4034cc68 2914 spin_lock(&sd_index_lock);
f27bac27 2915 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2916 spin_unlock(&sd_index_lock);
f27bac27 2917 } while (error == -EAGAIN);
1da177e4 2918
21208ae5
DK		 2919 if (error) {
2920 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2921 goto out_put;
1a03ae0f
MR		 2922 }
2923
3e1a7ff8 2924 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2925 if (error) {
2926 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2927 goto out_free_index;
21208ae5 2928 }
f27bac27 2929
1da177e4
LT		 2930 sdkp->device = sdp;
2931 sdkp->driver = &sd_template;
2932 sdkp->disk = gd;
2933 sdkp->index = index;
409f3499 2934 atomic_set(&sdkp->openers, 0);
9e1a1537 2935 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2936
601e7638
JB		 2937 if (!sdp->request_queue->rq_timeout) {
2938 if (sdp->type != TYPE_MOD)
2939 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2940 else
2941 blk_queue_rq_timeout(sdp->request_queue,
2942 SD_MOD_TIMEOUT);
2943 }
2944
2945 device_initialize(&sdkp->dev);
478a8a05 2946 sdkp->dev.parent = dev;
601e7638 2947 sdkp->dev.class = &sd_disk_class;
478a8a05 2948 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2949
2950 if (device_add(&sdkp->dev))
2951 goto out_free_index;
2952
478a8a05
AS		 2953 get_device(dev);
2954 dev_set_drvdata(dev, sdkp);
601e7638 2955
ea038f63 2956 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2957 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2958
2959 return 0;
2960
f27bac27 2961 out_free_index:
4034cc68 2962 spin_lock(&sd_index_lock);
f27bac27 2963 ida_remove(&sd_index_ida, index);
4034cc68 2964 spin_unlock(&sd_index_lock);
6bdaa1f1 2965 out_put:
1da177e4 2966 put_disk(gd);
6bdaa1f1 2967 out_free:
1da177e4 2968 kfree(sdkp);
6bdaa1f1 2969 out:
1da177e4
LT		 2970 return error;
2971}
2972
2973/**
2974 * sd_remove - called whenever a scsi disk (previously recognized by
2975 * sd_probe) is detached from the system. It is called (potentially
2976 * multiple times) during sd module unload.
2977 * @sdp: pointer to mid level scsi device object
2978 *
2979 * Note: this function is invoked from the scsi mid-level.
2980 * This function potentially frees up a device name (e.g. /dev/sdc)
2981 * that could be re-used by a subsequent sd_probe().
2982 * This function is not called when the built-in sd driver is "exit-ed".
2983 **/
2984static int sd_remove(struct device *dev)
2985{
601e7638 2986 struct scsi_disk *sdkp;
1da177e4 2987
601e7638 2988 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 2989 scsi_autopm_get_device(sdkp->device);
2990
a7a20d10 2991 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 2992 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 2993 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 2994 device_del(&sdkp->dev);
1da177e4
LT		 2995 del_gendisk(sdkp->disk);
2996 sd_shutdown(dev);
39b7f1e2 2997
0b950672 2998 mutex_lock(&sd_ref_mutex);
39b7f1e2 2999 dev_set_drvdata(dev, NULL);
ee959b00 3000 put_device(&sdkp->dev);
0b950672 3001 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 3002
3003 return 0;
3004}
3005
3006/**
3007 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 3008 * @dev: pointer to embedded class device
1da177e4 3009 *
0b950672 3010 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 3011 * called on last put, you should always use the scsi_disk_get()
3012 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 3013 * and never do a direct put_device.
1da177e4 3014 **/
ee959b00 3015static void scsi_disk_release(struct device *dev)
1da177e4 3016{
ee959b00 3017 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 3018 struct gendisk *disk = sdkp->disk;
3019
4034cc68 3020 spin_lock(&sd_index_lock);
f27bac27 3021 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 3022 spin_unlock(&sd_index_lock);
1da177e4
LT		 3023
3024 disk->private_data = NULL;
1da177e4 3025 put_disk(disk);
39b7f1e2 3026 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 3027
3028 kfree(sdkp);
3029}
3030
cc5d2c8c 3031static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3032{
3033 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3034 struct scsi_sense_hdr sshdr;
cc5d2c8c 3035 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3036 int res;
3037
3038 if (start)
3039 cmd[4] |= 1; /* START */
3040
d2886ea3
SR		 3041 if (sdp->start_stop_pwr_cond)
3042 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3043
c3c94c5a
TH		 3044 if (!scsi_device_online(sdp))
3045 return -ENODEV;
3046
9b21493c
LM		 3047 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3048 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
c3c94c5a 3049 if (res) {
cc5d2c8c
JB		 3050 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3051 sd_print_result(sdkp, res);
c3c94c5a 3052 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3053 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 3054 }
3055
3056 return res;
3057}
3058
1da177e4
LT		 3059/*
3060 * Send a SYNCHRONIZE CACHE instruction down to the device through
3061 * the normal SCSI command structure. Wait for the command to
3062 * complete.
3063 */
3064static void sd_shutdown(struct device *dev)
3065{
39b7f1e2 3066 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 3067
3068 if (!sdkp)
3069 return; /* this can happen */
3070
54f57588
LM		 3071 if (pm_runtime_suspended(dev))
3072 goto exit;
3073
39b7f1e2 3074 if (sdkp->WCE) {
e73aec82
MP		 3075 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3076 sd_sync_cache(sdkp);
39b7f1e2 3077 }
c3c94c5a 3078
cc5d2c8c
JB		 3079 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3080 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3081 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3082 }
3083
54f57588 3084exit:
39b7f1e2
AS		 3085 scsi_disk_put(sdkp);
3086}
1da177e4 3087
691e3d31 3088static int sd_suspend(struct device *dev)
c3c94c5a 3089{
c3c94c5a 3090 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3091 int ret = 0;
c3c94c5a 3092
3d1df278
AS		 3093 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3094 return 0;
c3c94c5a
TH		 3095
3096 if (sdkp->WCE) {
cc5d2c8c 3097 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 3098 ret = sd_sync_cache(sdkp);
3099 if (ret)
09ff92fe 3100 goto done;
c3c94c5a
TH		 3101 }
3102
691e3d31 3103 if (sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 3104 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3105 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3106 }
3107
09ff92fe
AS		 3108done:
3109 scsi_disk_put(sdkp);
3110 return ret;
c3c94c5a
TH		 3111}
3112
3113static int sd_resume(struct device *dev)
3114{
c3c94c5a 3115 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3116 int ret = 0;
c3c94c5a 3117
3d1df278
AS		 3118 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3119 return 0;
3120
cc5d2c8c 3121 if (!sdkp->device->manage_start_stop)
09ff92fe 3122 goto done;
c3c94c5a 3123
cc5d2c8c 3124 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 3125 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 3126
09ff92fe
AS		 3127done:
3128 scsi_disk_put(sdkp);
3129 return ret;
c3c94c5a
TH		 3130}
3131
1da177e4
LT		 3132/**
3133 * init_sd - entry point for this driver (both when built in or when
3134 * a module).
3135 *
3136 * Note: this function registers this driver with the scsi mid-level.
3137 **/
3138static int __init init_sd(void)
3139{
5e4009ba 3140 int majors = 0, i, err;
1da177e4
LT		 3141
3142 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3143
3144 for (i = 0; i < SD_MAJORS; i++)
3145 if (register_blkdev(sd_major(i), "sd") == 0)
3146 majors++;
3147
3148 if (!majors)
3149 return -ENODEV;
3150
5e4009ba
JG		 3151 err = class_register(&sd_disk_class);
3152 if (err)
3153 goto err_out;
6bdaa1f1 3154
4e7392ec
MP		 3155 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3156 0, 0, NULL);
3157 if (!sd_cdb_cache) {
3158 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3159 goto err_out_class;
3160 }
3161
3162 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3163 if (!sd_cdb_pool) {
3164 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3165 goto err_out_cache;
3166 }
3167
afd5e34b
JD		 3168 err = scsi_register_driver(&sd_template.gendrv);
3169 if (err)
3170 goto err_out_driver;
3171
5e4009ba
JG		 3172 return 0;
3173
afd5e34b
JD		 3174err_out_driver:
3175 mempool_destroy(sd_cdb_pool);
3176
4e7392ec
MP		 3177err_out_cache:
3178 kmem_cache_destroy(sd_cdb_cache);
3179
5e4009ba
JG		 3180err_out_class:
3181 class_unregister(&sd_disk_class);
3182err_out:
3183 for (i = 0; i < SD_MAJORS; i++)
3184 unregister_blkdev(sd_major(i), "sd");
3185 return err;
1da177e4
LT		 3186}
3187
3188/**
3189 * exit_sd - exit point for this driver (when it is a module).
3190 *
3191 * Note: this function unregisters this driver from the scsi mid-level.
3192 **/
3193static void __exit exit_sd(void)
3194{
3195 int i;
3196
3197 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3198
afd5e34b 3199 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3200 mempool_destroy(sd_cdb_pool);
3201 kmem_cache_destroy(sd_cdb_cache);
3202
5e4009ba
JG		 3203 class_unregister(&sd_disk_class);
3204
1da177e4
LT		 3205 for (i = 0; i < SD_MAJORS; i++)
3206 unregister_blkdev(sd_major(i), "sd");
3207}
3208
1da177e4
LT		 3209module_init(init_sd);
3210module_exit(exit_sd);
e73aec82
MP		 3211
3212static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3213 struct scsi_sense_hdr *sshdr)
3214{
2e4c3329 3215 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3216 scsi_show_sense_hdr(sshdr);
2e4c3329 3217 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3218 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3219}
3220
3221static void sd_print_result(struct scsi_disk *sdkp, int result)
3222{
2e4c3329 3223 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3224 scsi_show_result(result);
3225}
3226
kernel source for telekom puls (alcatel/mediatek)