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[SCSI] scsi_pm: use callbacks from dev_pm_ops for scsi devices
[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 *);
108static int sd_suspend(struct device *, pm_message_t state);
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;
145 int len;
146
147 if (sdp->type != TYPE_DISK)
148 /* no cache control on RBC devices; theoretically they
149 * can do it, but there's probably so many exceptions
150 * it's not worth the risk */
151 return -EINVAL;
152
6391a113 153 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 154 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 155 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
156 buf[len] == '\n') {
157 ct = i;
158 break;
159 }
160 }
161 if (ct < 0)
162 return -EINVAL;
163 rcd = ct & 0x01 ? 1 : 0;
164 wce = ct & 0x02 ? 1 : 0;
165 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
166 SD_MAX_RETRIES, &data, NULL))
167 return -EINVAL;
a9312fb8 168 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 169 data.block_descriptor_length);
170 buffer_data = buffer + data.header_length +
171 data.block_descriptor_length;
172 buffer_data[2] &= ~0x05;
173 buffer_data[2] |= wce << 2 | rcd;
174 sp = buffer_data[0] & 0x80 ? 1 : 0;
175
176 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
177 SD_MAX_RETRIES, &data, &sshdr)) {
178 if (scsi_sense_valid(&sshdr))
e73aec82 179 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 180 return -EINVAL;
181 }
f98a8cae 182 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 183 return count;
184}
185
ee959b00
TJ		 186static ssize_t
187sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
188 const char *buf, size_t count)
c3c94c5a 189{
ee959b00 190 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 191 struct scsi_device *sdp = sdkp->device;
192
193 if (!capable(CAP_SYS_ADMIN))
194 return -EACCES;
195
196 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
197
198 return count;
199}
200
ee959b00
TJ		 201static ssize_t
202sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
203 const char *buf, size_t count)
a144c5ae 204{
ee959b00 205 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 206 struct scsi_device *sdp = sdkp->device;
207
208 if (!capable(CAP_SYS_ADMIN))
209 return -EACCES;
210
211 if (sdp->type != TYPE_DISK)
212 return -EINVAL;
213
214 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
215
216 return count;
217}
218
ee959b00
TJ		 219static ssize_t
220sd_show_cache_type(struct device *dev, struct device_attribute *attr,
221 char *buf)
6bdaa1f1 222{
ee959b00 223 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 224 int ct = sdkp->RCD + 2*sdkp->WCE;
225
226 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
227}
228
ee959b00
TJ		 229static ssize_t
230sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 231{
ee959b00 232 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 233
234 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
235}
236
ee959b00
TJ		 237static ssize_t
238sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
239 char *buf)
c3c94c5a 240{
ee959b00 241 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 242 struct scsi_device *sdp = sdkp->device;
243
244 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
245}
246
ee959b00
TJ		 247static ssize_t
248sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
249 char *buf)
a144c5ae 250{
ee959b00 251 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 252
253 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
254}
255
e0597d70
MP		 256static ssize_t
257sd_show_protection_type(struct device *dev, struct device_attribute *attr,
258 char *buf)
259{
260 struct scsi_disk *sdkp = to_scsi_disk(dev);
261
262 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
263}
264
8172499a
MP		 265static ssize_t
266sd_store_protection_type(struct device *dev, struct device_attribute *attr,
267 const char *buf, size_t count)
268{
269 struct scsi_disk *sdkp = to_scsi_disk(dev);
270 unsigned int val;
271 int err;
272
273 if (!capable(CAP_SYS_ADMIN))
274 return -EACCES;
275
276 err = kstrtouint(buf, 10, &val);
277
278 if (err)
279 return err;
280
281 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
282 sdkp->protection_type = val;
283
284 return count;
285}
286
518fa8e3
MP		 287static ssize_t
288sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
289 char *buf)
290{
291 struct scsi_disk *sdkp = to_scsi_disk(dev);
292 struct scsi_device *sdp = sdkp->device;
293 unsigned int dif, dix;
294
295 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
296 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
297
298 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
299 dif = 0;
300 dix = 1;
301 }
302
303 if (!dif && !dix)
304 return snprintf(buf, 20, "none\n");
305
306 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
307}
308
e0597d70
MP		 309static ssize_t
310sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
311 char *buf)
312{
313 struct scsi_disk *sdkp = to_scsi_disk(dev);
314
315 return snprintf(buf, 20, "%u\n", sdkp->ATO);
316}
317
e339c1a7
MP		 318static ssize_t
319sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
320 char *buf)
321{
322 struct scsi_disk *sdkp = to_scsi_disk(dev);
323
c98a0eb0
MP		 324 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
325}
326
327static const char *lbp_mode[] = {
328 [SD_LBP_FULL] = "full",
329 [SD_LBP_UNMAP] = "unmap",
330 [SD_LBP_WS16] = "writesame_16",
331 [SD_LBP_WS10] = "writesame_10",
332 [SD_LBP_ZERO] = "writesame_zero",
333 [SD_LBP_DISABLE] = "disabled",
334};
335
336static ssize_t
337sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
338 char *buf)
339{
340 struct scsi_disk *sdkp = to_scsi_disk(dev);
341
342 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
343}
344
345static ssize_t
346sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
347 const char *buf, size_t count)
348{
349 struct scsi_disk *sdkp = to_scsi_disk(dev);
350 struct scsi_device *sdp = sdkp->device;
351
352 if (!capable(CAP_SYS_ADMIN))
353 return -EACCES;
354
355 if (sdp->type != TYPE_DISK)
356 return -EINVAL;
357
358 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
359 sd_config_discard(sdkp, SD_LBP_UNMAP);
360 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
361 sd_config_discard(sdkp, SD_LBP_WS16);
362 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
363 sd_config_discard(sdkp, SD_LBP_WS10);
364 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
365 sd_config_discard(sdkp, SD_LBP_ZERO);
366 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
367 sd_config_discard(sdkp, SD_LBP_DISABLE);
368 else
369 return -EINVAL;
370
371 return count;
e339c1a7
MP		 372}
373
18a4d0a2
MP		 374static ssize_t
375sd_show_max_medium_access_timeouts(struct device *dev,
376 struct device_attribute *attr, char *buf)
377{
378 struct scsi_disk *sdkp = to_scsi_disk(dev);
379
380 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
381}
382
383static ssize_t
384sd_store_max_medium_access_timeouts(struct device *dev,
385 struct device_attribute *attr,
386 const char *buf, size_t count)
387{
388 struct scsi_disk *sdkp = to_scsi_disk(dev);
389 int err;
390
391 if (!capable(CAP_SYS_ADMIN))
392 return -EACCES;
393
394 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
395
396 return err ? err : count;
397}
398
5db44863
MP		 399static ssize_t
400sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
401 char *buf)
402{
403 struct scsi_disk *sdkp = to_scsi_disk(dev);
404
405 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
406}
407
408static ssize_t
409sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
410 const char *buf, size_t count)
411{
412 struct scsi_disk *sdkp = to_scsi_disk(dev);
413 struct scsi_device *sdp = sdkp->device;
414 unsigned long max;
415 int err;
416
417 if (!capable(CAP_SYS_ADMIN))
418 return -EACCES;
419
420 if (sdp->type != TYPE_DISK)
421 return -EINVAL;
422
423 err = kstrtoul(buf, 10, &max);
424
425 if (err)
426 return err;
427
428 if (max == 0)
429 sdp->no_write_same = 1;
430 else if (max <= SD_MAX_WS16_BLOCKS)
431 sdkp->max_ws_blocks = max;
432
433 sd_config_write_same(sdkp);
434
435 return count;
436}
437
ee959b00 438static struct device_attribute sd_disk_attrs[] = {
6bdaa1f1
JB		 439 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
440 sd_store_cache_type),
441 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
a144c5ae
BK		 442 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
443 sd_store_allow_restart),
c3c94c5a
TH		 444 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
445 sd_store_manage_start_stop),
8172499a
MP		 446 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
447 sd_store_protection_type),
518fa8e3 448 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
e0597d70 449 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
e339c1a7 450 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
c98a0eb0
MP		 451 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
452 sd_store_provisioning_mode),
5db44863
MP		 453 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
454 sd_show_write_same_blocks, sd_store_write_same_blocks),
18a4d0a2
MP		 455 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
456 sd_show_max_medium_access_timeouts,
457 sd_store_max_medium_access_timeouts),
6bdaa1f1
JB		 458 __ATTR_NULL,
459};
460
461static struct class sd_disk_class = {
462 .name = "scsi_disk",
463 .owner = THIS_MODULE,
ee959b00
TJ		 464 .dev_release = scsi_disk_release,
465 .dev_attrs = sd_disk_attrs,
6bdaa1f1 466};
1da177e4
LT		 467
468static struct scsi_driver sd_template = {
469 .owner = THIS_MODULE,
470 .gendrv = {
471 .name = "sd",
472 .probe = sd_probe,
473 .remove = sd_remove,
c3c94c5a
TH		 474 .suspend = sd_suspend,
475 .resume = sd_resume,
1da177e4
LT		 476 .shutdown = sd_shutdown,
477 },
478 .rescan = sd_rescan,
7b3d9545 479 .done = sd_done,
18a4d0a2 480 .eh_action = sd_eh_action,
1da177e4
LT		 481};
482
483/*
484 * Device no to disk mapping:
485 *
486 * major disc2 disc p1
487 * |............|.............|....|....| <- dev_t
488 * 31 20 19 8 7 4 3 0
489 *
490 * Inside a major, we have 16k disks, however mapped non-
491 * contiguously. The first 16 disks are for major0, the next
492 * ones with major1, ... Disk 256 is for major0 again, disk 272
493 * for major1, ...
494 * As we stay compatible with our numbering scheme, we can reuse
495 * the well-know SCSI majors 8, 65--71, 136--143.
496 */
497static int sd_major(int major_idx)
498{
499 switch (major_idx) {
500 case 0:
501 return SCSI_DISK0_MAJOR;
502 case 1 ... 7:
503 return SCSI_DISK1_MAJOR + major_idx - 1;
504 case 8 ... 15:
505 return SCSI_DISK8_MAJOR + major_idx - 8;
506 default:
507 BUG();
508 return 0; /* shut up gcc */
509 }
510}
511
39b7f1e2 512static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 513{
514 struct scsi_disk *sdkp = NULL;
515
39b7f1e2
AS		 516 if (disk->private_data) {
517 sdkp = scsi_disk(disk);
518 if (scsi_device_get(sdkp->device) == 0)
ee959b00 519 get_device(&sdkp->dev);
39b7f1e2
AS		 520 else
521 sdkp = NULL;
522 }
523 return sdkp;
524}
525
526static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
527{
528 struct scsi_disk *sdkp;
529
0b950672 530 mutex_lock(&sd_ref_mutex);
39b7f1e2 531 sdkp = __scsi_disk_get(disk);
0b950672 532 mutex_unlock(&sd_ref_mutex);
1da177e4 533 return sdkp;
39b7f1e2 534}
1da177e4 535
39b7f1e2
AS		 536static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
537{
538 struct scsi_disk *sdkp;
539
0b950672 540 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 541 sdkp = dev_get_drvdata(dev);
542 if (sdkp)
543 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 544 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 545 return sdkp;
546}
547
548static void scsi_disk_put(struct scsi_disk *sdkp)
549{
550 struct scsi_device *sdev = sdkp->device;
551
0b950672 552 mutex_lock(&sd_ref_mutex);
ee959b00 553 put_device(&sdkp->dev);
1da177e4 554 scsi_device_put(sdev);
0b950672 555 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 556}
557
35e1a5d9
MP		 558static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
559{
560 unsigned int prot_op = SCSI_PROT_NORMAL;
561 unsigned int dix = scsi_prot_sg_count(scmd);
562
563 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
564 if (dif && dix)
565 prot_op = SCSI_PROT_READ_PASS;
566 else if (dif && !dix)
567 prot_op = SCSI_PROT_READ_STRIP;
568 else if (!dif && dix)
569 prot_op = SCSI_PROT_READ_INSERT;
570 } else {
571 if (dif && dix)
572 prot_op = SCSI_PROT_WRITE_PASS;
573 else if (dif && !dix)
574 prot_op = SCSI_PROT_WRITE_INSERT;
575 else if (!dif && dix)
576 prot_op = SCSI_PROT_WRITE_STRIP;
577 }
578
579 scsi_set_prot_op(scmd, prot_op);
580 scsi_set_prot_type(scmd, dif);
581}
582
c98a0eb0
MP		 583static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
584{
585 struct request_queue *q = sdkp->disk->queue;
586 unsigned int logical_block_size = sdkp->device->sector_size;
587 unsigned int max_blocks = 0;
588
589 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 590 q->limits.discard_alignment = sdkp->unmap_alignment *
591 logical_block_size;
c98a0eb0
MP		 592 q->limits.discard_granularity =
593 max(sdkp->physical_block_size,
594 sdkp->unmap_granularity * logical_block_size);
595
89730393
MP		 596 sdkp->provisioning_mode = mode;
597
c98a0eb0
MP		 598 switch (mode) {
599
600 case SD_LBP_DISABLE:
601 q->limits.max_discard_sectors = 0;
602 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
603 return;
604
605 case SD_LBP_UNMAP:
5db44863
MP		 606 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
607 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 608 break;
609
610 case SD_LBP_WS16:
5db44863
MP		 611 max_blocks = min_not_zero(sdkp->max_ws_blocks,
612 (u32)SD_MAX_WS16_BLOCKS);
c98a0eb0
MP		 613 break;
614
615 case SD_LBP_WS10:
5db44863
MP		 616 max_blocks = min_not_zero(sdkp->max_ws_blocks,
617 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 618 break;
619
620 case SD_LBP_ZERO:
5db44863
MP		 621 max_blocks = min_not_zero(sdkp->max_ws_blocks,
622 (u32)SD_MAX_WS10_BLOCKS);
c98a0eb0
MP		 623 q->limits.discard_zeroes_data = 1;
624 break;
625 }
626
627 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
628 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 629}
630
e339c1a7 631/**
26e85fcd 632 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
66ac0280 633 * @sdp: scsi device to operate one
e339c1a7
MP		 634 * @rq: Request to prepare
635 *
636 * Will issue either UNMAP or WRITE SAME(16) depending on preference
637 * indicated by target device.
638 **/
26e85fcd 639static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 640{
641 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 642 sector_t sector = blk_rq_pos(rq);
643 unsigned int nr_sectors = blk_rq_sectors(rq);
644 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 645 unsigned int len;
f1126e95 646 int ret;
c98a0eb0 647 char *buf;
66ac0280 648 struct page *page;
e339c1a7 649
26e85fcd
MP		 650 sector >>= ilog2(sdp->sector_size) - 9;
651 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7
MP		 652 rq->timeout = SD_TIMEOUT;
653
654 memset(rq->cmd, 0, rq->cmd_len);
655
66ac0280
CH		 656 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
657 if (!page)
658 return BLKPREP_DEFER;
659
c98a0eb0
MP		 660 switch (sdkp->provisioning_mode) {
661 case SD_LBP_UNMAP:
662 buf = page_address(page);
e339c1a7 663
66ac0280 664 rq->cmd_len = 10;
e339c1a7
MP		 665 rq->cmd[0] = UNMAP;
666 rq->cmd[8] = 24;
e339c1a7
MP		 667
668 put_unaligned_be16(6 + 16, &buf[0]);
669 put_unaligned_be16(16, &buf[2]);
670 put_unaligned_be64(sector, &buf[8]);
66ac0280 671 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 672
66ac0280 673 len = 24;
c98a0eb0
MP		 674 break;
675
676 case SD_LBP_WS16:
66ac0280 677 rq->cmd_len = 16;
e339c1a7
MP		 678 rq->cmd[0] = WRITE_SAME_16;
679 rq->cmd[1] = 0x8; /* UNMAP */
680 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 681 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
682
683 len = sdkp->device->sector_size;
c98a0eb0
MP		 684 break;
685
686 case SD_LBP_WS10:
687 case SD_LBP_ZERO:
688 rq->cmd_len = 10;
689 rq->cmd[0] = WRITE_SAME;
690 if (sdkp->provisioning_mode == SD_LBP_WS10)
691 rq->cmd[1] = 0x8; /* UNMAP */
692 put_unaligned_be32(sector, &rq->cmd[2]);
693 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
694
695 len = sdkp->device->sector_size;
696 break;
697
698 default:
09b9cc44 699 ret = BLKPREP_KILL;
c98a0eb0 700 goto out;
e339c1a7
MP		 701 }
702
66ac0280 703 blk_add_request_payload(rq, page, len);
f1126e95
FT		 704 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
705 rq->buffer = page_address(page);
26e85fcd 706 rq->__data_len = nr_bytes;
c98a0eb0
MP		 707
708out:
610a6349
FT		 709 if (ret != BLKPREP_OK) {
710 __free_page(page);
711 rq->buffer = NULL;
712 }
f1126e95
FT		 713 return ret;
714}
715
5db44863
MP		 716static void sd_config_write_same(struct scsi_disk *sdkp)
717{
718 struct request_queue *q = sdkp->disk->queue;
719 unsigned int logical_block_size = sdkp->device->sector_size;
720 unsigned int blocks = 0;
721
722 if (sdkp->device->no_write_same) {
723 sdkp->max_ws_blocks = 0;
724 goto out;
725 }
726
727 /* Some devices can not handle block counts above 0xffff despite
728 * supporting WRITE SAME(16). Consequently we default to 64k
729 * blocks per I/O unless the device explicitly advertises a
730 * bigger limit.
731 */
732 if (sdkp->max_ws_blocks == 0)
733 sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS;
734
735 if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
736 blocks = min_not_zero(sdkp->max_ws_blocks,
737 (u32)SD_MAX_WS16_BLOCKS);
738 else
739 blocks = min_not_zero(sdkp->max_ws_blocks,
740 (u32)SD_MAX_WS10_BLOCKS);
741
742out:
743 blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9));
744}
745
746/**
747 * sd_setup_write_same_cmnd - write the same data to multiple blocks
748 * @sdp: scsi device to operate one
749 * @rq: Request to prepare
750 *
751 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
752 * preference indicated by target device.
753 **/
754static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
755{
756 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
757 struct bio *bio = rq->bio;
758 sector_t sector = blk_rq_pos(rq);
759 unsigned int nr_sectors = blk_rq_sectors(rq);
760 unsigned int nr_bytes = blk_rq_bytes(rq);
761 int ret;
762
763 if (sdkp->device->no_write_same)
764 return BLKPREP_KILL;
765
766 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
767
768 sector >>= ilog2(sdp->sector_size) - 9;
769 nr_sectors >>= ilog2(sdp->sector_size) - 9;
770
771 rq->__data_len = sdp->sector_size;
772 rq->timeout = SD_WRITE_SAME_TIMEOUT;
773 memset(rq->cmd, 0, rq->cmd_len);
774
775 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
776 rq->cmd_len = 16;
777 rq->cmd[0] = WRITE_SAME_16;
778 put_unaligned_be64(sector, &rq->cmd[2]);
779 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
780 } else {
781 rq->cmd_len = 10;
782 rq->cmd[0] = WRITE_SAME;
783 put_unaligned_be32(sector, &rq->cmd[2]);
784 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
785 }
786
787 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
788 rq->__data_len = nr_bytes;
789
790 return ret;
791}
792
90467c29
FT		 793static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
794{
e3b3e624 795 rq->timeout = SD_FLUSH_TIMEOUT;
90467c29
FT		 796 rq->retries = SD_MAX_RETRIES;
797 rq->cmd[0] = SYNCHRONIZE_CACHE;
798 rq->cmd_len = 10;
799
800 return scsi_setup_blk_pc_cmnd(sdp, rq);
801}
802
f1126e95
FT		 803static void sd_unprep_fn(struct request_queue *q, struct request *rq)
804{
610a6349
FT		 805 if (rq->cmd_flags & REQ_DISCARD) {
806 free_page((unsigned long)rq->buffer);
807 rq->buffer = NULL;
808 }
e339c1a7
MP		 809}
810
1da177e4 811/**
2db93ce8 812 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 813 * information in the request structure.
814 * @SCpnt: pointer to mid-level's per scsi command structure that
815 * contains request and into which the scsi command is written
816 *
817 * Returns 1 if successful and 0 if error (or cannot be done now).
818 **/
7f9a6bc4 819static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 820{
7f9a6bc4
JB		 821 struct scsi_cmnd *SCpnt;
822 struct scsi_device *sdp = q->queuedata;
776b23a0 823 struct gendisk *disk = rq->rq_disk;
af55ff67 824 struct scsi_disk *sdkp;
83096ebf 825 sector_t block = blk_rq_pos(rq);
18351070 826 sector_t threshold;
83096ebf 827 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 828 int ret, host_dif;
4e7392ec 829 unsigned char protect;
7f9a6bc4 830
e339c1a7
MP		 831 /*
832 * Discard request come in as REQ_TYPE_FS but we turn them into
833 * block PC requests to make life easier.
834 */
66ac0280 835 if (rq->cmd_flags & REQ_DISCARD) {
26e85fcd 836 ret = sd_setup_discard_cmnd(sdp, rq);
66ac0280 837 goto out;
5db44863
MP		 838 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
839 ret = sd_setup_write_same_cmnd(sdp, rq);
840 goto out;
90467c29
FT		 841 } else if (rq->cmd_flags & REQ_FLUSH) {
842 ret = scsi_setup_flush_cmnd(sdp, rq);
843 goto out;
66ac0280 844 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 845 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
846 goto out;
847 } else if (rq->cmd_type != REQ_TYPE_FS) {
848 ret = BLKPREP_KILL;
849 goto out;
850 }
851 ret = scsi_setup_fs_cmnd(sdp, rq);
852 if (ret != BLKPREP_OK)
853 goto out;
854 SCpnt = rq->special;
af55ff67 855 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 856
857 /* from here on until we're complete, any goto out
858 * is used for a killable error condition */
859 ret = BLKPREP_KILL;
1da177e4 860
fa0d34be 861 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 862 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 863 "count=%d\n",
864 (unsigned long long)block,
865 this_count));
1da177e4
LT		 866
867 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 868 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 869 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 870 "Finishing %u sectors\n",
871 blk_rq_sectors(rq)));
fa0d34be
MP		 872 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
873 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 874 goto out;
1da177e4
LT		 875 }
876
877 if (sdp->changed) {
878 /*
879 * quietly refuse to do anything to a changed disc until
880 * the changed bit has been reset
881 */
3ff5588d 882 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 883 goto out;
1da177e4 884 }
7f9a6bc4 885
a0899d4d 886 /*
18351070
LT		 887 * Some SD card readers can't handle multi-sector accesses which touch
888 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 889 */
18351070
LT		 890 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
891 (sdp->sector_size / 512);
892
893 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
894 if (block < threshold) {
895 /* Access up to the threshold but not beyond */
896 this_count = threshold - block;
897 } else {
898 /* Access only a single hardware sector */
899 this_count = sdp->sector_size / 512;
900 }
901 }
a0899d4d 902
fa0d34be
MP		 903 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
904 (unsigned long long)block));
1da177e4
LT		 905
906 /*
907 * If we have a 1K hardware sectorsize, prevent access to single
908 * 512 byte sectors. In theory we could handle this - in fact
909 * the scsi cdrom driver must be able to handle this because
910 * we typically use 1K blocksizes, and cdroms typically have
911 * 2K hardware sectorsizes. Of course, things are simpler
912 * with the cdrom, since it is read-only. For performance
913 * reasons, the filesystems should be able to handle this
914 * and not force the scsi disk driver to use bounce buffers
915 * for this.
916 */
917 if (sdp->sector_size == 1024) {
83096ebf 918 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 919 scmd_printk(KERN_ERR, SCpnt,
920 "Bad block number requested\n");
7f9a6bc4 921 goto out;
1da177e4
LT		 922 } else {
923 block = block >> 1;
924 this_count = this_count >> 1;
925 }
926 }
927 if (sdp->sector_size == 2048) {
83096ebf 928 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 929 scmd_printk(KERN_ERR, SCpnt,
930 "Bad block number requested\n");
7f9a6bc4 931 goto out;
1da177e4
LT		 932 } else {
933 block = block >> 2;
934 this_count = this_count >> 2;
935 }
936 }
937 if (sdp->sector_size == 4096) {
83096ebf 938 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 939 scmd_printk(KERN_ERR, SCpnt,
940 "Bad block number requested\n");
7f9a6bc4 941 goto out;
1da177e4
LT		 942 } else {
943 block = block >> 3;
944 this_count = this_count >> 3;
945 }
946 }
947 if (rq_data_dir(rq) == WRITE) {
948 if (!sdp->writeable) {
7f9a6bc4 949 goto out;
1da177e4
LT		 950 }
951 SCpnt->cmnd[0] = WRITE_6;
952 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 953
8c579ab6
MP		 954 if (blk_integrity_rq(rq))
955 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 956
1da177e4
LT		 957 } else if (rq_data_dir(rq) == READ) {
958 SCpnt->cmnd[0] = READ_6;
959 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
960 } else {
e73aec82 961 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
7f9a6bc4 962 goto out;
1da177e4
LT		 963 }
964
fa0d34be 965 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 966 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 967 (rq_data_dir(rq) == WRITE) ?
968 "writing" : "reading", this_count,
83096ebf 969 blk_rq_sectors(rq)));
1da177e4 970
af55ff67 971 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 972 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
973 if (host_dif)
4e7392ec 974 protect = 1 << 5;
af55ff67 975 else
4e7392ec
MP		 976 protect = 0;
977
978 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
979 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
980
981 if (unlikely(SCpnt->cmnd == NULL)) {
982 ret = BLKPREP_DEFER;
983 goto out;
984 }
af55ff67 985
4e7392ec
MP		 986 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
987 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
988 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
989 SCpnt->cmnd[7] = 0x18;
990 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 991 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 992
993 /* LBA */
994 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
995 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
996 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
997 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
998 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
999 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1000 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1001 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1002
1003 /* Expected Indirect LBA */
1004 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1005 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1006 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1007 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1008
1009 /* Transfer length */
1010 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1011 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1012 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1013 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
53ad570b 1014 } else if (sdp->use_16_for_rw) {
1da177e4 1015 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 1016 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1017 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1018 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1019 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1020 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1021 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1022 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1023 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1024 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1025 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1026 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1027 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1028 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1029 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1030 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 1031 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 1032 SCpnt->device->use_10_for_rw) {
1033 if (this_count > 0xffff)
1034 this_count = 0xffff;
1035
1036 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 1037 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 1038 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1039 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1040 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1041 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1042 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1043 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1044 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1045 } else {
33659ebb 1046 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 1047 /*
1048 * This happens only if this drive failed
1049 * 10byte rw command with ILLEGAL_REQUEST
1050 * during operation and thus turned off
1051 * use_10_for_rw.
1052 */
e73aec82
MP		 1053 scmd_printk(KERN_ERR, SCpnt,
1054 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 1055 goto out;
007365ad
TH		 1056 }
1057
1da177e4
LT		 1058 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1059 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1060 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1061 SCpnt->cmnd[4] = (unsigned char) this_count;
1062 SCpnt->cmnd[5] = 0;
1063 }
30b0c37b 1064 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 1065
af55ff67 1066 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 1067 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 1068 sd_prot_op(SCpnt, host_dif);
af55ff67 1069
1da177e4
LT		 1070 /*
1071 * We shouldn't disconnect in the middle of a sector, so with a dumb
1072 * host adapter, it's safe to assume that we can at least transfer
1073 * this many bytes between each connect / disconnect.
1074 */
1075 SCpnt->transfersize = sdp->sector_size;
1076 SCpnt->underflow = this_count << 9;
1077 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 1078
1da177e4
LT		 1079 /*
1080 * This indicates that the command is ready from our end to be
1081 * queued.
1082 */
7f9a6bc4
JB		 1083 ret = BLKPREP_OK;
1084 out:
1085 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 1086}
1087
1088/**
1089 * sd_open - open a scsi disk device
1090 * @inode: only i_rdev member may be used
1091 * @filp: only f_mode and f_flags may be used
1092 *
1093 * Returns 0 if successful. Returns a negated errno value in case
1094 * of error.
1095 *
1096 * Note: This can be called from a user context (e.g. fsck(1) )
1097 * or from within the kernel (e.g. as a result of a mount(1) ).
1098 * In the latter case @inode and @filp carry an abridged amount
1099 * of information as noted above.
409f3499
AB		 1100 *
1101 * Locking: called with bdev->bd_mutex held.
1da177e4 1102 **/
0338e291 1103static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 1104{
0338e291 1105 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 1106 struct scsi_device *sdev;
1107 int retval;
1108
0338e291 1109 if (!sdkp)
1da177e4
LT		 1110 return -ENXIO;
1111
fa0d34be 1112 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 1113
1114 sdev = sdkp->device;
1115
478a8a05
AS		 1116 retval = scsi_autopm_get_device(sdev);
1117 if (retval)
1118 goto error_autopm;
1119
1da177e4
LT		 1120 /*
1121 * If the device is in error recovery, wait until it is done.
1122 * If the device is offline, then disallow any access to it.
1123 */
1124 retval = -ENXIO;
1125 if (!scsi_block_when_processing_errors(sdev))
1126 goto error_out;
1127
1128 if (sdev->removable || sdkp->write_prot)
0338e291 1129 check_disk_change(bdev);
1da177e4
LT		 1130
1131 /*
1132 * If the drive is empty, just let the open fail.
1133 */
1134 retval = -ENOMEDIUM;
0338e291 1135 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1136 goto error_out;
1137
1138 /*
1139 * If the device has the write protect tab set, have the open fail
1140 * if the user expects to be able to write to the thing.
1141 */
1142 retval = -EROFS;
0338e291 1143 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1144 goto error_out;
1145
1146 /*
1147 * It is possible that the disk changing stuff resulted in
1148 * the device being taken offline. If this is the case,
1149 * report this to the user, and don't pretend that the
1150 * open actually succeeded.
1151 */
1152 retval = -ENXIO;
1153 if (!scsi_device_online(sdev))
1154 goto error_out;
1155
409f3499 1156 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1157 if (scsi_block_when_processing_errors(sdev))
1158 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1159 }
1160
1161 return 0;
1162
1163error_out:
478a8a05
AS		 1164 scsi_autopm_put_device(sdev);
1165error_autopm:
1da177e4
LT		 1166 scsi_disk_put(sdkp);
1167 return retval;
1168}
1169
1170/**
1171 * sd_release - invoked when the (last) close(2) is called on this
1172 * scsi disk.
1173 * @inode: only i_rdev member may be used
1174 * @filp: only f_mode and f_flags may be used
1175 *
1176 * Returns 0.
1177 *
1178 * Note: may block (uninterruptible) if error recovery is underway
1179 * on this disk.
409f3499
AB		 1180 *
1181 * Locking: called with bdev->bd_mutex held.
1da177e4 1182 **/
0338e291 1183static int sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1184{
1da177e4
LT		 1185 struct scsi_disk *sdkp = scsi_disk(disk);
1186 struct scsi_device *sdev = sdkp->device;
1187
56937f7b 1188 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1189
7e443312 1190 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1191 if (scsi_block_when_processing_errors(sdev))
1192 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1193 }
1194
1195 /*
1196 * XXX and what if there are packets in flight and this close()
1197 * XXX is followed by a "rmmod sd_mod"?
1198 */
478a8a05
AS		 1199
1200 scsi_autopm_put_device(sdev);
1da177e4
LT		 1201 scsi_disk_put(sdkp);
1202 return 0;
1203}
1204
a885c8c4 1205static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1206{
1207 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1208 struct scsi_device *sdp = sdkp->device;
1209 struct Scsi_Host *host = sdp->host;
1210 int diskinfo[4];
1211
1212 /* default to most commonly used values */
1213 diskinfo[0] = 0x40; /* 1 << 6 */
1214 diskinfo[1] = 0x20; /* 1 << 5 */
1215 diskinfo[2] = sdkp->capacity >> 11;
1216
1217 /* override with calculated, extended default, or driver values */
1218 if (host->hostt->bios_param)
1219 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1220 else
1221 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1222
a885c8c4
CH		 1223 geo->heads = diskinfo[0];
1224 geo->sectors = diskinfo[1];
1225 geo->cylinders = diskinfo[2];
1da177e4
LT		 1226 return 0;
1227}
1228
1229/**
1230 * sd_ioctl - process an ioctl
1231 * @inode: only i_rdev/i_bdev members may be used
1232 * @filp: only f_mode and f_flags may be used
1233 * @cmd: ioctl command number
1234 * @arg: this is third argument given to ioctl(2) system call.
1235 * Often contains a pointer.
1236 *
25985edc 1237 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1238 * success as well). Returns a negated errno value in case of error.
1239 *
1240 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1241 * down in the scsi subsystem.
1da177e4 1242 **/
0338e291 1243static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1244 unsigned int cmd, unsigned long arg)
1245{
1da177e4 1246 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1247 struct scsi_disk *sdkp = scsi_disk(disk);
1248 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1249 void __user *p = (void __user *)arg;
1250 int error;
1251
fe2d1851
NN		 1252 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1253 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1254
0bfc96cb
PB		 1255 error = scsi_verify_blk_ioctl(bdev, cmd);
1256 if (error < 0)
1257 return error;
1258
1da177e4
LT		 1259 /*
1260 * If we are in the middle of error recovery, don't let anyone
1261 * else try and use this device. Also, if error recovery fails, it
1262 * may try and take the device offline, in which case all further
1263 * access to the device is prohibited.
1264 */
83ff6fe8 1265 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1266 (mode & FMODE_NDELAY) != 0);
1da177e4 1267 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1268 goto out;
1da177e4 1269
1da177e4
LT		 1270 /*
1271 * Send SCSI addressing ioctls directly to mid level, send other
1272 * ioctls to block level and then onto mid level if they can't be
1273 * resolved.
1274 */
1275 switch (cmd) {
1276 case SCSI_IOCTL_GET_IDLUN:
1277 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1278 error = scsi_ioctl(sdp, cmd, p);
1279 break;
1da177e4 1280 default:
577ebb37 1281 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1282 if (error != -ENOTTY)
8a6cfeb6
AB		 1283 break;
1284 error = scsi_ioctl(sdp, cmd, p);
1285 break;
1da177e4 1286 }
8a6cfeb6 1287out:
8a6cfeb6 1288 return error;
1da177e4
LT		 1289}
1290
1291static void set_media_not_present(struct scsi_disk *sdkp)
1292{
2bae0093
TH		 1293 if (sdkp->media_present)
1294 sdkp->device->changed = 1;
1295
1296 if (sdkp->device->removable) {
1297 sdkp->media_present = 0;
1298 sdkp->capacity = 0;
1299 }
1300}
1301
1302static int media_not_present(struct scsi_disk *sdkp,
1303 struct scsi_sense_hdr *sshdr)
1304{
1305 if (!scsi_sense_valid(sshdr))
1306 return 0;
1307
1308 /* not invoked for commands that could return deferred errors */
1309 switch (sshdr->sense_key) {
1310 case UNIT_ATTENTION:
1311 case NOT_READY:
1312 /* medium not present */
1313 if (sshdr->asc == 0x3A) {
1314 set_media_not_present(sdkp);
1315 return 1;
1316 }
1317 }
1318 return 0;
1da177e4
LT		 1319}
1320
1321/**
2bae0093
TH		 1322 * sd_check_events - check media events
1323 * @disk: kernel device descriptor
1324 * @clearing: disk events currently being cleared
1da177e4 1325 *
2bae0093 1326 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1327 *
1328 * Note: this function is invoked from the block subsystem.
1329 **/
2bae0093 1330static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1331{
1332 struct scsi_disk *sdkp = scsi_disk(disk);
1333 struct scsi_device *sdp = sdkp->device;
001aac25 1334 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1335 int retval;
1336
2bae0093 1337 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1338
1339 /*
1340 * If the device is offline, don't send any commands - just pretend as
1341 * if the command failed. If the device ever comes back online, we
1342 * can deal with it then. It is only because of unrecoverable errors
1343 * that we would ever take a device offline in the first place.
1344 */
285e9670
KS		 1345 if (!scsi_device_online(sdp)) {
1346 set_media_not_present(sdkp);
285e9670
KS		 1347 goto out;
1348 }
1da177e4
LT		 1349
1350 /*
1351 * Using TEST_UNIT_READY enables differentiation between drive with
1352 * no cartridge loaded - NOT READY, drive with changed cartridge -
1353 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1354 *
1355 * Drives that auto spin down. eg iomega jaz 1G, will be started
1356 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1357 * sd_revalidate() is called.
1358 */
1359 retval = -ENODEV;
285e9670 1360
001aac25 1361 if (scsi_block_when_processing_errors(sdp)) {
4e2247b2
LT		 1362 retval = scsi_autopm_get_device(sdp);
1363 if (retval)
1364 goto out;
1365
001aac25
JB		 1366 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1367 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1368 sshdr);
4e2247b2 1369 scsi_autopm_put_device(sdp);
001aac25 1370 }
1da177e4 1371
2bae0093
TH		 1372 /* failed to execute TUR, assume media not present */
1373 if (host_byte(retval)) {
285e9670 1374 set_media_not_present(sdkp);
285e9670
KS		 1375 goto out;
1376 }
1da177e4 1377
2bae0093
TH		 1378 if (media_not_present(sdkp, sshdr))
1379 goto out;
1380
1da177e4
LT		 1381 /*
1382 * For removable scsi disk we have to recognise the presence
2bae0093 1383 * of a disk in the drive.
1da177e4 1384 */
2bae0093
TH		 1385 if (!sdkp->media_present)
1386 sdp->changed = 1;
1da177e4 1387 sdkp->media_present = 1;
285e9670 1388out:
3ff5588d 1389 /*
2bae0093 1390 * sdp->changed is set under the following conditions:
3ff5588d 1391 *
2bae0093
TH		 1392 * Medium present state has changed in either direction.
1393 * Device has indicated UNIT_ATTENTION.
3ff5588d 1394 */
001aac25 1395 kfree(sshdr);
2bae0093
TH		 1396 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1397 sdp->changed = 0;
1da177e4 1398 return retval;
1da177e4
LT		 1399}
1400
e73aec82 1401static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1402{
1da177e4 1403 int retries, res;
e73aec82 1404 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1405 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1406
1407 if (!scsi_device_online(sdp))
1408 return -ENODEV;
1409
1da177e4 1410
1da177e4
LT		 1411 for (retries = 3; retries > 0; --retries) {
1412 unsigned char cmd[10] = { 0 };
1413
1414 cmd[0] = SYNCHRONIZE_CACHE;
1415 /*
1416 * Leave the rest of the command zero to indicate
1417 * flush everything.
1418 */
ea73a9f2 1419 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
e3b3e624 1420 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
ea73a9f2 1421 if (res == 0)
1da177e4
LT		 1422 break;
1423 }
1424
e73aec82
MP		 1425 if (res) {
1426 sd_print_result(sdkp, res);
1427 if (driver_byte(res) & DRIVER_SENSE)
1428 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1429 }
1430
3721050a
TH		 1431 if (res)
1432 return -EIO;
1433 return 0;
1da177e4
LT		 1434}
1435
1da177e4
LT		 1436static void sd_rescan(struct device *dev)
1437{
39b7f1e2
AS		 1438 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1439
1440 if (sdkp) {
f98a8cae 1441 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1442 scsi_disk_put(sdkp);
1443 }
1da177e4
LT		 1444}
1445
1446
1447#ifdef CONFIG_COMPAT
1448/*
1449 * This gets directly called from VFS. When the ioctl
1450 * is not recognized we go back to the other translation paths.
1451 */
0338e291
AV		 1452static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1453 unsigned int cmd, unsigned long arg)
1da177e4 1454{
0338e291 1455 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1456 int ret;
1457
1458 ret = scsi_verify_blk_ioctl(bdev, cmd);
1459 if (ret < 0)
1460 return ret;
1da177e4
LT		 1461
1462 /*
1463 * If we are in the middle of error recovery, don't let anyone
1464 * else try and use this device. Also, if error recovery fails, it
1465 * may try and take the device offline, in which case all further
1466 * access to the device is prohibited.
1467 */
1468 if (!scsi_block_when_processing_errors(sdev))
1469 return -ENODEV;
1470
1471 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1472 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1473
1474 return ret;
1475 }
1476
1477 /*
1478 * Let the static ioctl translation table take care of it.
1479 */
1480 return -ENOIOCTLCMD;
1481}
1482#endif
1483
83d5cde4 1484static const struct block_device_operations sd_fops = {
1da177e4 1485 .owner = THIS_MODULE,
0338e291
AV		 1486 .open = sd_open,
1487 .release = sd_release,
8a6cfeb6 1488 .ioctl = sd_ioctl,
a885c8c4 1489 .getgeo = sd_getgeo,
1da177e4 1490#ifdef CONFIG_COMPAT
0338e291 1491 .compat_ioctl = sd_compat_ioctl,
1da177e4 1492#endif
2bae0093 1493 .check_events = sd_check_events,
1da177e4 1494 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1495 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1496};
1497
18a4d0a2
MP		 1498/**
1499 * sd_eh_action - error handling callback
1500 * @scmd: sd-issued command that has failed
1501 * @eh_cmnd: The command that was sent during error handling
1502 * @eh_cmnd_len: Length of eh_cmnd in bytes
1503 * @eh_disp: The recovery disposition suggested by the midlayer
1504 *
1505 * This function is called by the SCSI midlayer upon completion of
1506 * an error handling command (TEST UNIT READY, START STOP UNIT,
1507 * etc.) The command sent to the device by the error handler is
1508 * stored in eh_cmnd. The result of sending the eh command is
1509 * passed in eh_disp.
1510 **/
1511static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1512 int eh_cmnd_len, int eh_disp)
1513{
1514 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1515
1516 if (!scsi_device_online(scmd->device) ||
1517 !scsi_medium_access_command(scmd))
1518 return eh_disp;
1519
1520 /*
1521 * The device has timed out executing a medium access command.
1522 * However, the TEST UNIT READY command sent during error
1523 * handling completed successfully. Either the device is in the
1524 * process of recovering or has it suffered an internal failure
1525 * that prevents access to the storage medium.
1526 */
1527 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1528 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1529 sdkp->medium_access_timed_out++;
1530
1531 /*
1532 * If the device keeps failing read/write commands but TEST UNIT
1533 * READY always completes successfully we assume that medium
1534 * access is no longer possible and take the device offline.
1535 */
1536 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1537 scmd_printk(KERN_ERR, scmd,
1538 "Medium access timeout failure. Offlining disk!\n");
1539 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1540
1541 return FAILED;
1542 }
1543
1544 return eh_disp;
1545}
1546
af55ff67
MP		 1547static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1548{
83096ebf
TH		 1549 u64 start_lba = blk_rq_pos(scmd->request);
1550 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1551 u64 bad_lba;
1552 int info_valid;
a8733c7b
JB		 1553 /*
1554 * resid is optional but mostly filled in. When it's unused,
1555 * its value is zero, so we assume the whole buffer transferred
1556 */
1557 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1558 unsigned int good_bytes;
af55ff67 1559
33659ebb 1560 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1561 return 0;
1562
1563 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1564 SCSI_SENSE_BUFFERSIZE,
1565 &bad_lba);
1566 if (!info_valid)
1567 return 0;
1568
1569 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1570 return 0;
1571
1572 if (scmd->device->sector_size < 512) {
1573 /* only legitimate sector_size here is 256 */
1574 start_lba <<= 1;
1575 end_lba <<= 1;
1576 } else {
1577 /* be careful ... don't want any overflows */
1578 u64 factor = scmd->device->sector_size / 512;
1579 do_div(start_lba, factor);
1580 do_div(end_lba, factor);
1581 }
1582
1583 /* The bad lba was reported incorrectly, we have no idea where
1584 * the error is.
1585 */
1586 if (bad_lba < start_lba || bad_lba >= end_lba)
1587 return 0;
1588
1589 /* This computation should always be done in terms of
1590 * the resolution of the device's medium.
1591 */
a8733c7b
JB		 1592 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1593 return min(good_bytes, transferred);
af55ff67
MP		 1594}
1595
1da177e4 1596/**
7b3d9545 1597 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1598 * driver has completed (successfully or otherwise) a scsi command.
1599 * @SCpnt: mid-level's per command structure.
1600 *
1601 * Note: potentially run from within an ISR. Must not block.
1602 **/
7b3d9545 1603static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1604{
1605 int result = SCpnt->result;
af55ff67 1606 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1607 struct scsi_sense_hdr sshdr;
4e7392ec 1608 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1609 struct request *req = SCpnt->request;
1da177e4
LT		 1610 int sense_valid = 0;
1611 int sense_deferred = 0;
c98a0eb0 1612 unsigned char op = SCpnt->cmnd[0];
5db44863 1613 unsigned char unmap = SCpnt->cmnd[1] & 8;
1da177e4 1614
5db44863 1615 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
26e85fcd
MP		 1616 if (!result) {
1617 good_bytes = blk_rq_bytes(req);
1618 scsi_set_resid(SCpnt, 0);
1619 } else {
1620 good_bytes = 0;
1621 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1622 }
1623 }
6a32a8ae 1624
1da177e4
LT		 1625 if (result) {
1626 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1627 if (sense_valid)
1628 sense_deferred = scsi_sense_is_deferred(&sshdr);
1629 }
1da177e4 1630#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1631 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1632 if (sense_valid) {
fa0d34be 1633 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1634 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1635 "ascq]=%x,%x,%x,%x\n",
1636 sshdr.response_code,
1637 sshdr.sense_key, sshdr.asc,
1638 sshdr.ascq));
1da177e4
LT		 1639 }
1640#endif
03aba2f7
LT		 1641 if (driver_byte(result) != DRIVER_SENSE &&
1642 (!sense_valid || sense_deferred))
1643 goto out;
1644
18a4d0a2
MP		 1645 sdkp->medium_access_timed_out = 0;
1646
03aba2f7
LT		 1647 switch (sshdr.sense_key) {
1648 case HARDWARE_ERROR:
1649 case MEDIUM_ERROR:
af55ff67 1650 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1651 break;
1652 case RECOVERED_ERROR:
af55ff67
MP		 1653 good_bytes = scsi_bufflen(SCpnt);
1654 break;
10dab226
JW		 1655 case NO_SENSE:
1656 /* This indicates a false check condition, so ignore it. An
1657 * unknown amount of data was transferred so treat it as an
1658 * error.
1659 */
1660 scsi_print_sense("sd", SCpnt);
1661 SCpnt->result = 0;
1662 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1663 break;
c98a0eb0
MP		 1664 case ABORTED_COMMAND:
1665 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1666 good_bytes = sd_completed_bytes(SCpnt);
1667 break;
1668 case ILLEGAL_REQUEST:
1669 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1670 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0 1671 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
5db44863
MP		 1672 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1673 switch (op) {
1674 case UNMAP:
1675 sd_config_discard(sdkp, SD_LBP_DISABLE);
1676 break;
1677 case WRITE_SAME_16:
1678 case WRITE_SAME:
1679 if (unmap)
1680 sd_config_discard(sdkp, SD_LBP_DISABLE);
1681 else {
1682 sdkp->device->no_write_same = 1;
1683 sd_config_write_same(sdkp);
1684
1685 good_bytes = 0;
1686 req->__data_len = blk_rq_bytes(req);
1687 req->cmd_flags |= REQ_QUIET;
1688 }
1689 }
1690 }
03aba2f7
LT		 1691 break;
1692 default:
1693 break;
1da177e4 1694 }
03aba2f7 1695 out:
af55ff67
MP		 1696 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1697 sd_dif_complete(SCpnt, good_bytes);
1698
4e7392ec 1699 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
77c9cfc5
MP		 1700 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1701
1702 /* We have to print a failed command here as the
1703 * extended CDB gets freed before scsi_io_completion()
1704 * is called.
1705 */
1706 if (result)
1707 scsi_print_command(SCpnt);
1708
4e7392ec 1709 mempool_free(SCpnt->cmnd, sd_cdb_pool);
77c9cfc5
MP		 1710 SCpnt->cmnd = NULL;
1711 SCpnt->cmd_len = 0;
1712 }
4e7392ec 1713
7b3d9545 1714 return good_bytes;
1da177e4
LT		 1715}
1716
1da177e4
LT		 1717/*
1718 * spinup disk - called only in sd_revalidate_disk()
1719 */
1720static void
e73aec82 1721sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1722{
1da177e4 1723 unsigned char cmd[10];
4451e472 1724 unsigned long spintime_expire = 0;
1da177e4
LT		 1725 int retries, spintime;
1726 unsigned int the_result;
1727 struct scsi_sense_hdr sshdr;
1728 int sense_valid = 0;
1729
1730 spintime = 0;
1731
1732 /* Spin up drives, as required. Only do this at boot time */
1733 /* Spinup needs to be done for module loads too. */
1734 do {
1735 retries = 0;
1736
1737 do {
1738 cmd[0] = TEST_UNIT_READY;
1739 memset((void *) &cmd[1], 0, 9);
1740
ea73a9f2
JB		 1741 the_result = scsi_execute_req(sdkp->device, cmd,
1742 DMA_NONE, NULL, 0,
1743 &sshdr, SD_TIMEOUT,
f4f4e47e 1744 SD_MAX_RETRIES, NULL);
1da177e4 1745
b4d38e38
AS		 1746 /*
1747 * If the drive has indicated to us that it
1748 * doesn't have any media in it, don't bother
1749 * with any more polling.
1750 */
1751 if (media_not_present(sdkp, &sshdr))
1752 return;
1753
1da177e4 1754 if (the_result)
ea73a9f2 1755 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1756 retries++;
1757 } while (retries < 3 &&
1758 (!scsi_status_is_good(the_result) ||
1759 ((driver_byte(the_result) & DRIVER_SENSE) &&
1760 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1761
1da177e4
LT		 1762 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1763 /* no sense, TUR either succeeded or failed
1764 * with a status error */
e73aec82
MP		 1765 if(!spintime && !scsi_status_is_good(the_result)) {
1766 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1767 sd_print_result(sdkp, the_result);
1768 }
1da177e4
LT		 1769 break;
1770 }
1771
1772 /*
1773 * The device does not want the automatic start to be issued.
1774 */
33dd6f92 1775 if (sdkp->device->no_start_on_add)
1da177e4 1776 break;
1da177e4 1777
33dd6f92
MW		 1778 if (sense_valid && sshdr.sense_key == NOT_READY) {
1779 if (sshdr.asc == 4 && sshdr.ascq == 3)
1780 break; /* manual intervention required */
1781 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1782 break; /* standby */
1783 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1784 break; /* unavailable */
1785 /*
1786 * Issue command to spin up drive when not ready
1787 */
1da177e4 1788 if (!spintime) {
e73aec82 1789 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1790 cmd[0] = START_STOP;
1791 cmd[1] = 1; /* Return immediately */
1792 memset((void *) &cmd[2], 0, 8);
1793 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1794 if (sdkp->device->start_stop_pwr_cond)
1795 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1796 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1797 NULL, 0, &sshdr,
f4f4e47e
FT		 1798 SD_TIMEOUT, SD_MAX_RETRIES,
1799 NULL);
4451e472
AS		 1800 spintime_expire = jiffies + 100 * HZ;
1801 spintime = 1;
1da177e4 1802 }
1da177e4
LT		 1803 /* Wait 1 second for next try */
1804 msleep(1000);
1805 printk(".");
4451e472
AS		 1806
1807 /*
1808 * Wait for USB flash devices with slow firmware.
1809 * Yes, this sense key/ASC combination shouldn't
1810 * occur here. It's characteristic of these devices.
1811 */
1812 } else if (sense_valid &&
1813 sshdr.sense_key == UNIT_ATTENTION &&
1814 sshdr.asc == 0x28) {
1815 if (!spintime) {
1816 spintime_expire = jiffies + 5 * HZ;
1817 spintime = 1;
1818 }
1819 /* Wait 1 second for next try */
1820 msleep(1000);
1da177e4
LT		 1821 } else {
1822 /* we don't understand the sense code, so it's
1823 * probably pointless to loop */
1824 if(!spintime) {
e73aec82
MP		 1825 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1826 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1827 }
1828 break;
1829 }
1830
4451e472 1831 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1832
1833 if (spintime) {
1834 if (scsi_status_is_good(the_result))
1835 printk("ready\n");
1836 else
1837 printk("not responding...\n");
1838 }
1839}
1840
e0597d70
MP		 1841
1842/*
1843 * Determine whether disk supports Data Integrity Field.
1844 */
fe542396 1845static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1846{
1847 struct scsi_device *sdp = sdkp->device;
1848 u8 type;
fe542396 1849 int ret = 0;
e0597d70
MP		 1850
1851 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1852 return ret;
35e1a5d9
MP		 1853
1854 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1855
fe542396
MP		 1856 if (type > SD_DIF_TYPE3_PROTECTION)
1857 ret = -ENODEV;
1858 else if (scsi_host_dif_capable(sdp->host, type))
1859 ret = 1;
1860
1861 if (sdkp->first_scan || type != sdkp->protection_type)
1862 switch (ret) {
1863 case -ENODEV:
1864 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1865 " protection type %u. Disabling disk!\n",
1866 type);
1867 break;
1868 case 1:
1869 sd_printk(KERN_NOTICE, sdkp,
1870 "Enabling DIF Type %u protection\n", type);
1871 break;
1872 case 0:
1873 sd_printk(KERN_NOTICE, sdkp,
1874 "Disabling DIF Type %u protection\n", type);
1875 break;
1876 }
e0597d70 1877
be922f47
MP		 1878 sdkp->protection_type = type;
1879
fe542396 1880 return ret;
e0597d70
MP		 1881}
1882
0da205e0
MW		 1883static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1884 struct scsi_sense_hdr *sshdr, int sense_valid,
1885 int the_result)
1886{
1887 sd_print_result(sdkp, the_result);
1888 if (driver_byte(the_result) & DRIVER_SENSE)
1889 sd_print_sense_hdr(sdkp, sshdr);
1890 else
1891 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1892
1893 /*
1894 * Set dirty bit for removable devices if not ready -
1895 * sometimes drives will not report this properly.
1896 */
1897 if (sdp->removable &&
1898 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1899 set_media_not_present(sdkp);
0da205e0
MW		 1900
1901 /*
1902 * We used to set media_present to 0 here to indicate no media
1903 * in the drive, but some drives fail read capacity even with
1904 * media present, so we can't do that.
1905 */
1906 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1907}
1908
1909#define RC16_LEN 32
1910#if RC16_LEN > SD_BUF_SIZE
1911#error RC16_LEN must not be more than SD_BUF_SIZE
1912#endif
1913
3233ac19
JB		 1914#define READ_CAPACITY_RETRIES_ON_RESET 10
1915
0da205e0
MW		 1916static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1917 unsigned char *buffer)
ea73a9f2 1918{
1da177e4 1919 unsigned char cmd[16];
1da177e4
LT		 1920 struct scsi_sense_hdr sshdr;
1921 int sense_valid = 0;
0da205e0 1922 int the_result;
3233ac19 1923 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1924 unsigned int alignment;
0da205e0
MW		 1925 unsigned long long lba;
1926 unsigned sector_size;
1da177e4 1927
5ce524bd
HG		 1928 if (sdp->no_read_capacity_16)
1929 return -EINVAL;
1930
1da177e4 1931 do {
0da205e0
MW		 1932 memset(cmd, 0, 16);
1933 cmd[0] = SERVICE_ACTION_IN;
1934 cmd[1] = SAI_READ_CAPACITY_16;
1935 cmd[13] = RC16_LEN;
1936 memset(buffer, 0, RC16_LEN);
1937
ea73a9f2 1938 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1939 buffer, RC16_LEN, &sshdr,
1940 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1941
ea73a9f2 1942 if (media_not_present(sdkp, &sshdr))
0da205e0 1943 return -ENODEV;
1da177e4 1944
2b301307 1945 if (the_result) {
ea73a9f2 1946 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1947 if (sense_valid &&
1948 sshdr.sense_key == ILLEGAL_REQUEST &&
1949 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1950 sshdr.ascq == 0x00)
1951 /* Invalid Command Operation Code or
1952 * Invalid Field in CDB, just retry
1953 * silently with RC10 */
1954 return -EINVAL;
3233ac19
JB		 1955 if (sense_valid &&
1956 sshdr.sense_key == UNIT_ATTENTION &&
1957 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1958 /* Device reset might occur several times,
1959 * give it one more chance */
1960 if (--reset_retries > 0)
1961 continue;
2b301307 1962 }
1da177e4
LT		 1963 retries--;
1964
1965 } while (the_result && retries);
1966
0da205e0 1967 if (the_result) {
e73aec82 1968 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 1969 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1970 return -EINVAL;
1971 }
e73aec82 1972
8f76d151
DH		 1973 sector_size = get_unaligned_be32(&buffer[8]);
1974 lba = get_unaligned_be64(&buffer[0]);
0da205e0 1975
fe542396
MP		 1976 if (sd_read_protection_type(sdkp, buffer) < 0) {
1977 sdkp->capacity = 0;
1978 return -ENODEV;
1979 }
0da205e0
MW		 1980
1981 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1982 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1983 "kernel compiled with support for large block "
1984 "devices.\n");
1985 sdkp->capacity = 0;
1986 return -EOVERFLOW;
1987 }
1988
ea09bcc9 1989 /* Logical blocks per physical block exponent */
526f7c79 1990 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 1991
1992 /* Lowest aligned logical block */
1993 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1994 blk_queue_alignment_offset(sdp->request_queue, alignment);
1995 if (alignment && sdkp->first_scan)
1996 sd_printk(KERN_NOTICE, sdkp,
1997 "physical block alignment offset: %u\n", alignment);
1998
c98a0eb0
MP		 1999 if (buffer[14] & 0x80) { /* LBPME */
2000 sdkp->lbpme = 1;
e339c1a7 2001
c98a0eb0
MP		 2002 if (buffer[14] & 0x40) /* LBPRZ */
2003 sdkp->lbprz = 1;
e339c1a7 2004
c98a0eb0 2005 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 2006 }
2007
0da205e0
MW		 2008 sdkp->capacity = lba + 1;
2009 return sector_size;
2010}
2011
2012static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2013 unsigned char *buffer)
2014{
2015 unsigned char cmd[16];
2016 struct scsi_sense_hdr sshdr;
2017 int sense_valid = 0;
2018 int the_result;
3233ac19 2019 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 2020 sector_t lba;
2021 unsigned sector_size;
2022
2023 do {
2024 cmd[0] = READ_CAPACITY;
2025 memset(&cmd[1], 0, 9);
2026 memset(buffer, 0, 8);
2027
2028 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2029 buffer, 8, &sshdr,
2030 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2031
2032 if (media_not_present(sdkp, &sshdr))
2033 return -ENODEV;
2034
3233ac19 2035 if (the_result) {
0da205e0 2036 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 2037 if (sense_valid &&
2038 sshdr.sense_key == UNIT_ATTENTION &&
2039 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2040 /* Device reset might occur several times,
2041 * give it one more chance */
2042 if (--reset_retries > 0)
2043 continue;
2044 }
0da205e0
MW		 2045 retries--;
2046
2047 } while (the_result && retries);
2048
2049 if (the_result) {
2050 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2051 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2052 return -EINVAL;
2053 }
2054
8f76d151
DH		 2055 sector_size = get_unaligned_be32(&buffer[4]);
2056 lba = get_unaligned_be32(&buffer[0]);
0da205e0 2057
5ce524bd
HG		 2058 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2059 /* Some buggy (usb cardreader) devices return an lba of
2060 0xffffffff when the want to report a size of 0 (with
2061 which they really mean no media is present) */
2062 sdkp->capacity = 0;
5cc10350 2063 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 2064 return sector_size;
2065 }
2066
0da205e0
MW		 2067 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2068 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2069 "kernel compiled with support for large block "
2070 "devices.\n");
2071 sdkp->capacity = 0;
2072 return -EOVERFLOW;
2073 }
2074
2075 sdkp->capacity = lba + 1;
526f7c79 2076 sdkp->physical_block_size = sector_size;
0da205e0
MW		 2077 return sector_size;
2078}
2079
2b301307
MW		 2080static int sd_try_rc16_first(struct scsi_device *sdp)
2081{
f87146bb
HR		 2082 if (sdp->host->max_cmd_len < 16)
2083 return 0;
6a0bdffa
AS		 2084 if (sdp->try_rc_10_first)
2085 return 0;
2b301307
MW		 2086 if (sdp->scsi_level > SCSI_SPC_2)
2087 return 1;
2088 if (scsi_device_protection(sdp))
2089 return 1;
2090 return 0;
2091}
2092
0da205e0
MW		 2093/*
2094 * read disk capacity
2095 */
2096static void
2097sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2098{
2099 int sector_size;
2100 struct scsi_device *sdp = sdkp->device;
70a9b873 2101 sector_t old_capacity = sdkp->capacity;
0da205e0 2102
2b301307 2103 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 2104 sector_size = read_capacity_16(sdkp, sdp, buffer);
2105 if (sector_size == -EOVERFLOW)
1da177e4 2106 goto got_data;
2b301307
MW		 2107 if (sector_size == -ENODEV)
2108 return;
2109 if (sector_size < 0)
2110 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 2111 if (sector_size < 0)
2112 return;
1da177e4 2113 } else {
0da205e0
MW		 2114 sector_size = read_capacity_10(sdkp, sdp, buffer);
2115 if (sector_size == -EOVERFLOW)
2116 goto got_data;
2117 if (sector_size < 0)
2118 return;
2119 if ((sizeof(sdkp->capacity) > 4) &&
2120 (sdkp->capacity > 0xffffffffULL)) {
2121 int old_sector_size = sector_size;
2122 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2123 "Trying to use READ CAPACITY(16).\n");
2124 sector_size = read_capacity_16(sdkp, sdp, buffer);
2125 if (sector_size < 0) {
2126 sd_printk(KERN_NOTICE, sdkp,
2127 "Using 0xffffffff as device size\n");
2128 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2129 sector_size = old_sector_size;
2130 goto got_data;
2131 }
2132 }
2133 }
1da177e4 2134
5c211caa
AS		 2135 /* Some devices are known to return the total number of blocks,
2136 * not the highest block number. Some devices have versions
2137 * which do this and others which do not. Some devices we might
2138 * suspect of doing this but we don't know for certain.
2139 *
2140 * If we know the reported capacity is wrong, decrement it. If
2141 * we can only guess, then assume the number of blocks is even
2142 * (usually true but not always) and err on the side of lowering
2143 * the capacity.
2144 */
2145 if (sdp->fix_capacity ||
2146 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2147 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2148 "from its reported value: %llu\n",
2149 (unsigned long long) sdkp->capacity);
1da177e4 2150 --sdkp->capacity;
61bf54b7
ON		 2151 }
2152
1da177e4
LT		 2153got_data:
2154 if (sector_size == 0) {
2155 sector_size = 512;
e73aec82
MP		 2156 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2157 "assuming 512.\n");
1da177e4
LT		 2158 }
2159
2160 if (sector_size != 512 &&
2161 sector_size != 1024 &&
2162 sector_size != 2048 &&
2163 sector_size != 4096 &&
2164 sector_size != 256) {
e73aec82
MP		 2165 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2166 sector_size);
1da177e4
LT		 2167 /*
2168 * The user might want to re-format the drive with
2169 * a supported sectorsize. Once this happens, it
2170 * would be relatively trivial to set the thing up.
2171 * For this reason, we leave the thing in the table.
2172 */
2173 sdkp->capacity = 0;
2174 /*
2175 * set a bogus sector size so the normal read/write
2176 * logic in the block layer will eventually refuse any
2177 * request on this device without tripping over power
2178 * of two sector size assumptions
2179 */
2180 sector_size = 512;
2181 }
e1defc4f 2182 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2183
1da177e4 2184 {
7404ad3b 2185 char cap_str_2[10], cap_str_10[10];
520a2c27 2186 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2187
7404ad3b
JB		 2188 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2189 sizeof(cap_str_2));
2190 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2191 sizeof(cap_str_10));
1da177e4 2192
ea09bcc9 2193 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2194 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2195 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2196 (unsigned long long)sdkp->capacity,
2197 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2198
526f7c79 2199 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2200 sd_printk(KERN_NOTICE, sdkp,
2201 "%u-byte physical blocks\n",
526f7c79 2202 sdkp->physical_block_size);
ea09bcc9 2203 }
1da177e4
LT		 2204 }
2205
53ad570b
JH		 2206 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2207
1da177e4
LT		 2208 /* Rescale capacity to 512-byte units */
2209 if (sector_size == 4096)
2210 sdkp->capacity <<= 3;
2211 else if (sector_size == 2048)
2212 sdkp->capacity <<= 2;
2213 else if (sector_size == 1024)
2214 sdkp->capacity <<= 1;
2215 else if (sector_size == 256)
2216 sdkp->capacity >>= 1;
2217
526f7c79
MP		 2218 blk_queue_physical_block_size(sdp->request_queue,
2219 sdkp->physical_block_size);
1da177e4
LT		 2220 sdkp->device->sector_size = sector_size;
2221}
2222
2223/* called with buffer of length 512 */
2224static inline int
ea73a9f2
JB		 2225sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2226 unsigned char *buffer, int len, struct scsi_mode_data *data,
2227 struct scsi_sense_hdr *sshdr)
1da177e4 2228{
ea73a9f2 2229 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2230 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2231 sshdr);
1da177e4
LT		 2232}
2233
2234/*
2235 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2236 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2237 */
2238static void
e73aec82 2239sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2240{
1da177e4 2241 int res;
ea73a9f2 2242 struct scsi_device *sdp = sdkp->device;
1da177e4 2243 struct scsi_mode_data data;
70a9b873 2244 int old_wp = sdkp->write_prot;
1da177e4
LT		 2245
2246 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2247 if (sdp->skip_ms_page_3f) {
e73aec82 2248 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2249 return;
2250 }
2251
ea73a9f2
JB		 2252 if (sdp->use_192_bytes_for_3f) {
2253 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2254 } else {
2255 /*
2256 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2257 * We have to start carefully: some devices hang if we ask
2258 * for more than is available.
2259 */
ea73a9f2 2260 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2261
2262 /*
2263 * Second attempt: ask for page 0 When only page 0 is
2264 * implemented, a request for page 3F may return Sense Key
2265 * 5: Illegal Request, Sense Code 24: Invalid field in
2266 * CDB.
2267 */
2268 if (!scsi_status_is_good(res))
ea73a9f2 2269 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2270
2271 /*
2272 * Third attempt: ask 255 bytes, as we did earlier.
2273 */
2274 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2275 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2276 &data, NULL);
1da177e4
LT		 2277 }
2278
2279 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2280 sd_printk(KERN_WARNING, sdkp,
2281 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2282 } else {
2283 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2284 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2285 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2286 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2287 sdkp->write_prot ? "on" : "off");
2288 sd_printk(KERN_DEBUG, sdkp,
2289 "Mode Sense: %02x %02x %02x %02x\n",
2290 buffer[0], buffer[1], buffer[2], buffer[3]);
2291 }
1da177e4
LT		 2292 }
2293}
2294
2295/*
2296 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2297 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2298 */
2299static void
e73aec82 2300sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2301{
1da177e4 2302 int len = 0, res;
ea73a9f2 2303 struct scsi_device *sdp = sdkp->device;
1da177e4 2304
631e8a13
AV		 2305 int dbd;
2306 int modepage;
0bcaa111 2307 int first_len;
1da177e4
LT		 2308 struct scsi_mode_data data;
2309 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2310 int old_wce = sdkp->WCE;
2311 int old_rcd = sdkp->RCD;
2312 int old_dpofua = sdkp->DPOFUA;
1da177e4 2313
0bcaa111
LT		 2314 first_len = 4;
2315 if (sdp->skip_ms_page_8) {
2316 if (sdp->type == TYPE_RBC)
2317 goto defaults;
2318 else {
2319 if (sdp->skip_ms_page_3f)
2320 goto defaults;
2321 modepage = 0x3F;
2322 if (sdp->use_192_bytes_for_3f)
2323 first_len = 192;
2324 dbd = 0;
2325 }
2326 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2327 modepage = 6;
2328 dbd = 8;
2329 } else {
2330 modepage = 8;
2331 dbd = 0;
2332 }
2333
1da177e4 2334 /* cautiously ask */
0bcaa111
LT		 2335 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2336 &data, &sshdr);
1da177e4
LT		 2337
2338 if (!scsi_status_is_good(res))
2339 goto bad_sense;
2340
6d73c851
AV		 2341 if (!data.header_length) {
2342 modepage = 6;
0bcaa111 2343 first_len = 0;
e73aec82 2344 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2345 }
2346
1da177e4
LT		 2347 /* that went OK, now ask for the proper length */
2348 len = data.length;
2349
2350 /*
2351 * We're only interested in the first three bytes, actually.
2352 * But the data cache page is defined for the first 20.
2353 */
2354 if (len < 3)
2355 goto bad_sense;
0bcaa111
LT		 2356 else if (len > SD_BUF_SIZE) {
2357 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2358 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2359 len = SD_BUF_SIZE;
2360 }
2361 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2362 len = 192;
1da177e4
LT		 2363
2364 /* Get the data */
0bcaa111
LT		 2365 if (len > first_len)
2366 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2367 &data, &sshdr);
1da177e4
LT		 2368
2369 if (scsi_status_is_good(res)) {
631e8a13 2370 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2371
0bcaa111
LT		 2372 while (offset < len) {
2373 u8 page_code = buffer[offset] & 0x3F;
2374 u8 spf = buffer[offset] & 0x40;
2375
2376 if (page_code == 8 || page_code == 6) {
2377 /* We're interested only in the first 3 bytes.
2378 */
2379 if (len - offset <= 2) {
2380 sd_printk(KERN_ERR, sdkp, "Incomplete "
2381 "mode parameter data\n");
2382 goto defaults;
2383 } else {
2384 modepage = page_code;
2385 goto Page_found;
2386 }
2387 } else {
2388 /* Go to the next page */
2389 if (spf && len - offset > 3)
2390 offset += 4 + (buffer[offset+2] << 8) +
2391 buffer[offset+3];
2392 else if (!spf && len - offset > 1)
2393 offset += 2 + buffer[offset+1];
2394 else {
2395 sd_printk(KERN_ERR, sdkp, "Incomplete "
2396 "mode parameter data\n");
2397 goto defaults;
2398 }
2399 }
48970800
AV		 2400 }
2401
0bcaa111
LT		 2402 if (modepage == 0x3F) {
2403 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2404 "present\n");
2405 goto defaults;
2406 } else if ((buffer[offset] & 0x3f) != modepage) {
e73aec82 2407 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
631e8a13
AV		 2408 goto defaults;
2409 }
0bcaa111 2410 Page_found:
631e8a13
AV		 2411 if (modepage == 8) {
2412 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2413 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2414 } else {
2415 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2416 sdkp->RCD = 0;
2417 }
1da177e4 2418
007365ad
TH		 2419 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2420 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2421 sd_printk(KERN_NOTICE, sdkp,
2422 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2423 sdkp->DPOFUA = 0;
2424 }
2425
70a9b873
MP		 2426 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2427 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2428 sd_printk(KERN_NOTICE, sdkp,
2429 "Write cache: %s, read cache: %s, %s\n",
2430 sdkp->WCE ? "enabled" : "disabled",
2431 sdkp->RCD ? "disabled" : "enabled",
2432 sdkp->DPOFUA ? "supports DPO and FUA"
2433 : "doesn't support DPO or FUA");
1da177e4
LT		 2434
2435 return;
2436 }
2437
2438bad_sense:
ea73a9f2 2439 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2440 sshdr.sense_key == ILLEGAL_REQUEST &&
2441 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2442 /* Invalid field in CDB */
2443 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2444 else
e73aec82 2445 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2446
2447defaults:
b81478d8
NJ		 2448 if (sdp->wce_default_on) {
2449 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2450 sdkp->WCE = 1;
2451 } else {
2452 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2453 sdkp->WCE = 0;
2454 }
1da177e4 2455 sdkp->RCD = 0;
48970800 2456 sdkp->DPOFUA = 0;
1da177e4
LT		 2457}
2458
e0597d70
MP		 2459/*
2460 * The ATO bit indicates whether the DIF application tag is available
2461 * for use by the operating system.
2462 */
439d77f7 2463static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2464{
2465 int res, offset;
2466 struct scsi_device *sdp = sdkp->device;
2467 struct scsi_mode_data data;
2468 struct scsi_sense_hdr sshdr;
2469
2470 if (sdp->type != TYPE_DISK)
2471 return;
2472
2473 if (sdkp->protection_type == 0)
2474 return;
2475
2476 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2477 SD_MAX_RETRIES, &data, &sshdr);
2478
2479 if (!scsi_status_is_good(res) || !data.header_length ||
2480 data.length < 6) {
2481 sd_printk(KERN_WARNING, sdkp,
2482 "getting Control mode page failed, assume no ATO\n");
2483
2484 if (scsi_sense_valid(&sshdr))
2485 sd_print_sense_hdr(sdkp, &sshdr);
2486
2487 return;
2488 }
2489
2490 offset = data.header_length + data.block_descriptor_length;
2491
2492 if ((buffer[offset] & 0x3f) != 0x0a) {
2493 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2494 return;
2495 }
2496
2497 if ((buffer[offset + 5] & 0x80) == 0)
2498 return;
2499
2500 sdkp->ATO = 1;
2501
2502 return;
2503}
2504
d11b6916
MP		 2505/**
2506 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2507 * @disk: disk to query
2508 */
2509static void sd_read_block_limits(struct scsi_disk *sdkp)
2510{
2511 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2512 const int vpd_len = 64;
e3deec09 2513 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2514
e3deec09
JB		 2515 if (!buffer ||
2516 /* Block Limits VPD */
2517 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2518 goto out;
d11b6916
MP		 2519
2520 blk_queue_io_min(sdkp->disk->queue,
2521 get_unaligned_be16(&buffer[6]) * sector_sz);
2522 blk_queue_io_opt(sdkp->disk->queue,
2523 get_unaligned_be32(&buffer[12]) * sector_sz);
2524
c98a0eb0
MP		 2525 if (buffer[3] == 0x3c) {
2526 unsigned int lba_count, desc_count;
e339c1a7 2527
5db44863 2528 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
e339c1a7 2529
c98a0eb0 2530 if (!sdkp->lbpme)
045d3fe7 2531 goto out;
045d3fe7 2532
c98a0eb0
MP		 2533 lba_count = get_unaligned_be32(&buffer[20]);
2534 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2535
c98a0eb0
MP		 2536 if (lba_count && desc_count)
2537 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2538
c98a0eb0 2539 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2540
2541 if (buffer[32] & 0x80)
c98a0eb0 2542 sdkp->unmap_alignment =
e339c1a7 2543 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2544
2545 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2546
2547 if (sdkp->max_unmap_blocks)
2548 sd_config_discard(sdkp, SD_LBP_UNMAP);
2549 else
2550 sd_config_discard(sdkp, SD_LBP_WS16);
2551
2552 } else { /* LBP VPD page tells us what to use */
2553
2554 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2555 sd_config_discard(sdkp, SD_LBP_UNMAP);
2556 else if (sdkp->lbpws)
2557 sd_config_discard(sdkp, SD_LBP_WS16);
2558 else if (sdkp->lbpws10)
2559 sd_config_discard(sdkp, SD_LBP_WS10);
2560 else
2561 sd_config_discard(sdkp, SD_LBP_DISABLE);
2562 }
e339c1a7
MP		 2563 }
2564
e3deec09 2565 out:
d11b6916
MP		 2566 kfree(buffer);
2567}
2568
3821d768
MP		 2569/**
2570 * sd_read_block_characteristics - Query block dev. characteristics
2571 * @disk: disk to query
2572 */
2573static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2574{
e3deec09 2575 unsigned char *buffer;
3821d768 2576 u16 rot;
bb2d3de1 2577 const int vpd_len = 64;
3821d768 2578
e3deec09 2579 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2580
e3deec09
JB		 2581 if (!buffer ||
2582 /* Block Device Characteristics VPD */
2583 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2584 goto out;
3821d768
MP		 2585
2586 rot = get_unaligned_be16(&buffer[4]);
2587
2588 if (rot == 1)
2589 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2590
e3deec09 2591 out:
3821d768
MP		 2592 kfree(buffer);
2593}
2594
045d3fe7 2595/**
c98a0eb0 2596 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2597 * @disk: disk to query
2598 */
c98a0eb0 2599static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2600{
2601 unsigned char *buffer;
2602 const int vpd_len = 8;
2603
c98a0eb0 2604 if (sdkp->lbpme == 0)
045d3fe7
MP		 2605 return;
2606
2607 buffer = kmalloc(vpd_len, GFP_KERNEL);
2608
2609 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2610 goto out;
2611
c98a0eb0
MP		 2612 sdkp->lbpvpd = 1;
2613 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2614 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2615 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2616
2617 out:
2618 kfree(buffer);
2619}
2620
5db44863
MP		 2621static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2622{
2623 if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
2624 WRITE_SAME_16))
2625 sdkp->ws16 = 1;
2626}
2627
ffd4bc2a
MP		 2628static int sd_try_extended_inquiry(struct scsi_device *sdp)
2629{
2630 /*
2631 * Although VPD inquiries can go to SCSI-2 type devices,
2632 * some USB ones crash on receiving them, and the pages
2633 * we currently ask for are for SPC-3 and beyond
2634 */
09b6b51b 2635 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2636 return 1;
2637 return 0;
2638}
2639
1da177e4
LT		 2640/**
2641 * sd_revalidate_disk - called the first time a new disk is seen,
2642 * performs disk spin up, read_capacity, etc.
2643 * @disk: struct gendisk we care about
2644 **/
2645static int sd_revalidate_disk(struct gendisk *disk)
2646{
2647 struct scsi_disk *sdkp = scsi_disk(disk);
2648 struct scsi_device *sdp = sdkp->device;
1da177e4 2649 unsigned char *buffer;
4913efe4 2650 unsigned flush = 0;
1da177e4 2651
fa0d34be
MP		 2652 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2653 "sd_revalidate_disk\n"));
1da177e4
LT		 2654
2655 /*
2656 * If the device is offline, don't try and read capacity or any
2657 * of the other niceties.
2658 */
2659 if (!scsi_device_online(sdp))
2660 goto out;
2661
a6123f14 2662 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2663 if (!buffer) {
e73aec82
MP		 2664 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2665 "allocation failure.\n");
ea73a9f2 2666 goto out;
1da177e4
LT		 2667 }
2668
e73aec82 2669 sd_spinup_disk(sdkp);
1da177e4
LT		 2670
2671 /*
2672 * Without media there is no reason to ask; moreover, some devices
2673 * react badly if we do.
2674 */
2675 if (sdkp->media_present) {
e73aec82 2676 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2677
2678 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2679 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2680 sd_read_block_limits(sdkp);
2681 sd_read_block_characteristics(sdkp);
2682 }
2683
e73aec82
MP		 2684 sd_read_write_protect_flag(sdkp, buffer);
2685 sd_read_cache_type(sdkp, buffer);
e0597d70 2686 sd_read_app_tag_own(sdkp, buffer);
5db44863 2687 sd_read_write_same(sdkp, buffer);
1da177e4 2688 }
461d4e90 2689
70a9b873
MP		 2690 sdkp->first_scan = 0;
2691
461d4e90
TH		 2692 /*
2693 * We now have all cache related info, determine how we deal
4913efe4 2694 * with flush requests.
461d4e90 2695 */
4913efe4
TH		 2696 if (sdkp->WCE) {
2697 flush |= REQ_FLUSH;
2698 if (sdkp->DPOFUA)
2699 flush |= REQ_FUA;
2700 }
461d4e90 2701
4913efe4 2702 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2703
1da177e4 2704 set_capacity(disk, sdkp->capacity);
5db44863 2705 sd_config_write_same(sdkp);
1da177e4
LT		 2706 kfree(buffer);
2707
1da177e4
LT		 2708 out:
2709 return 0;
2710}
2711
72ec24bd
TH		 2712/**
2713 * sd_unlock_native_capacity - unlock native capacity
2714 * @disk: struct gendisk to set capacity for
2715 *
2716 * Block layer calls this function if it detects that partitions
2717 * on @disk reach beyond the end of the device. If the SCSI host
2718 * implements ->unlock_native_capacity() method, it's invoked to
2719 * give it a chance to adjust the device capacity.
2720 *
2721 * CONTEXT:
2722 * Defined by block layer. Might sleep.
2723 */
2724static void sd_unlock_native_capacity(struct gendisk *disk)
2725{
2726 struct scsi_device *sdev = scsi_disk(disk)->device;
2727
2728 if (sdev->host->hostt->unlock_native_capacity)
2729 sdev->host->hostt->unlock_native_capacity(sdev);
2730}
2731
3e1a7ff8
TH		 2732/**
2733 * sd_format_disk_name - format disk name
2734 * @prefix: name prefix - ie. "sd" for SCSI disks
2735 * @index: index of the disk to format name for
2736 * @buf: output buffer
2737 * @buflen: length of the output buffer
2738 *
2739 * SCSI disk names starts at sda. The 26th device is sdz and the
2740 * 27th is sdaa. The last one for two lettered suffix is sdzz
2741 * which is followed by sdaaa.
2742 *
2743 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2744 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2745 * determined using similar method as 26 base conversion with the
2746 * index shifted -1 after each digit is computed.
2747 *
2748 * CONTEXT:
2749 * Don't care.
2750 *
2751 * RETURNS:
2752 * 0 on success, -errno on failure.
2753 */
2754static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2755{
2756 const int base = 'z' - 'a' + 1;
2757 char *begin = buf + strlen(prefix);
2758 char *end = buf + buflen;
2759 char *p;
2760 int unit;
2761
2762 p = end - 1;
2763 *p = '\0';
2764 unit = base;
2765 do {
2766 if (p == begin)
2767 return -EINVAL;
2768 *--p = 'a' + (index % unit);
2769 index = (index / unit) - 1;
2770 } while (index >= 0);
2771
2772 memmove(begin, p, end - p);
2773 memcpy(buf, prefix, strlen(prefix));
2774
2775 return 0;
2776}
2777
4ace92fc
AV		 2778/*
2779 * The asynchronous part of sd_probe
2780 */
2781static void sd_probe_async(void *data, async_cookie_t cookie)
2782{
2783 struct scsi_disk *sdkp = data;
2784 struct scsi_device *sdp;
2785 struct gendisk *gd;
2786 u32 index;
2787 struct device *dev;
2788
2789 sdp = sdkp->device;
2790 gd = sdkp->disk;
2791 index = sdkp->index;
2792 dev = &sdp->sdev_gendev;
2793
1a03ae0f
MR		 2794 gd->major = sd_major((index & 0xf0) >> 4);
2795 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2796 gd->minors = SD_MINORS;
2797
4ace92fc
AV		 2798 gd->fops = &sd_fops;
2799 gd->private_data = &sdkp->driver;
2800 gd->queue = sdkp->device->request_queue;
2801
70a9b873
MP		 2802 /* defaults, until the device tells us otherwise */
2803 sdp->sector_size = 512;
2804 sdkp->capacity = 0;
2805 sdkp->media_present = 1;
2806 sdkp->write_prot = 0;
2807 sdkp->WCE = 0;
2808 sdkp->RCD = 0;
2809 sdkp->ATO = 0;
2810 sdkp->first_scan = 1;
18a4d0a2 2811 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2812
4ace92fc
AV		 2813 sd_revalidate_disk(gd);
2814
2815 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2816 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2817
2818 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2819 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2820 if (sdp->removable) {
4ace92fc 2821 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2822 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2823 }
4ace92fc 2824
4ace92fc 2825 add_disk(gd);
fe542396
MP		 2826 if (sdkp->capacity)
2827 sd_dif_config_host(sdkp);
4ace92fc 2828
3821d768
MP		 2829 sd_revalidate_disk(gd);
2830
4ace92fc
AV		 2831 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2832 sdp->removable ? "removable " : "");
478a8a05 2833 scsi_autopm_put_device(sdp);
ea038f63 2834 put_device(&sdkp->dev);
4ace92fc
AV		 2835}
2836
1da177e4
LT		 2837/**
2838 * sd_probe - called during driver initialization and whenever a
2839 * new scsi device is attached to the system. It is called once
2840 * for each scsi device (not just disks) present.
2841 * @dev: pointer to device object
2842 *
2843 * Returns 0 if successful (or not interested in this scsi device
2844 * (e.g. scanner)); 1 when there is an error.
2845 *
2846 * Note: this function is invoked from the scsi mid-level.
2847 * This function sets up the mapping between a given
2848 * <host,channel,id,lun> (found in sdp) and new device name
2849 * (e.g. /dev/sda). More precisely it is the block device major
2850 * and minor number that is chosen here.
2851 *
2db93ce8
PU		 2852 * Assume sd_probe is not re-entrant (for time being)
2853 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2854 **/
2855static int sd_probe(struct device *dev)
2856{
2857 struct scsi_device *sdp = to_scsi_device(dev);
2858 struct scsi_disk *sdkp;
2859 struct gendisk *gd;
439d77f7 2860 int index;
1da177e4
LT		 2861 int error;
2862
2863 error = -ENODEV;
631e8a13 2864 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2865 goto out;
2866
9ccfc756 2867 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2868 "sd_probe\n"));
1da177e4
LT		 2869
2870 error = -ENOMEM;
24669f75 2871 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2872 if (!sdkp)
2873 goto out;
2874
689d6fac 2875 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2876 if (!gd)
2877 goto out_free;
2878
f27bac27
TH		 2879 do {
2880 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2881 goto out_put;
1da177e4 2882
4034cc68 2883 spin_lock(&sd_index_lock);
f27bac27 2884 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2885 spin_unlock(&sd_index_lock);
f27bac27 2886 } while (error == -EAGAIN);
1da177e4 2887
21208ae5
DK		 2888 if (error) {
2889 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2890 goto out_put;
1a03ae0f
MR		 2891 }
2892
3e1a7ff8 2893 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2894 if (error) {
2895 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2896 goto out_free_index;
21208ae5 2897 }
f27bac27 2898
1da177e4
LT		 2899 sdkp->device = sdp;
2900 sdkp->driver = &sd_template;
2901 sdkp->disk = gd;
2902 sdkp->index = index;
409f3499 2903 atomic_set(&sdkp->openers, 0);
9e1a1537 2904 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2905
601e7638
JB		 2906 if (!sdp->request_queue->rq_timeout) {
2907 if (sdp->type != TYPE_MOD)
2908 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2909 else
2910 blk_queue_rq_timeout(sdp->request_queue,
2911 SD_MOD_TIMEOUT);
2912 }
2913
2914 device_initialize(&sdkp->dev);
478a8a05 2915 sdkp->dev.parent = dev;
601e7638 2916 sdkp->dev.class = &sd_disk_class;
478a8a05 2917 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2918
2919 if (device_add(&sdkp->dev))
2920 goto out_free_index;
2921
478a8a05
AS		 2922 get_device(dev);
2923 dev_set_drvdata(dev, sdkp);
601e7638 2924
ea038f63 2925 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2926 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2927
2928 return 0;
2929
f27bac27 2930 out_free_index:
4034cc68 2931 spin_lock(&sd_index_lock);
f27bac27 2932 ida_remove(&sd_index_ida, index);
4034cc68 2933 spin_unlock(&sd_index_lock);
6bdaa1f1 2934 out_put:
1da177e4 2935 put_disk(gd);
6bdaa1f1 2936 out_free:
1da177e4 2937 kfree(sdkp);
6bdaa1f1 2938 out:
1da177e4
LT		 2939 return error;
2940}
2941
2942/**
2943 * sd_remove - called whenever a scsi disk (previously recognized by
2944 * sd_probe) is detached from the system. It is called (potentially
2945 * multiple times) during sd module unload.
2946 * @sdp: pointer to mid level scsi device object
2947 *
2948 * Note: this function is invoked from the scsi mid-level.
2949 * This function potentially frees up a device name (e.g. /dev/sdc)
2950 * that could be re-used by a subsequent sd_probe().
2951 * This function is not called when the built-in sd driver is "exit-ed".
2952 **/
2953static int sd_remove(struct device *dev)
2954{
601e7638 2955 struct scsi_disk *sdkp;
1da177e4 2956
601e7638 2957 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 2958 scsi_autopm_get_device(sdkp->device);
2959
a7a20d10 2960 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 2961 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 2962 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 2963 device_del(&sdkp->dev);
1da177e4
LT		 2964 del_gendisk(sdkp->disk);
2965 sd_shutdown(dev);
39b7f1e2 2966
0b950672 2967 mutex_lock(&sd_ref_mutex);
39b7f1e2 2968 dev_set_drvdata(dev, NULL);
ee959b00 2969 put_device(&sdkp->dev);
0b950672 2970 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 2971
2972 return 0;
2973}
2974
2975/**
2976 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 2977 * @dev: pointer to embedded class device
1da177e4 2978 *
0b950672 2979 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 2980 * called on last put, you should always use the scsi_disk_get()
2981 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 2982 * and never do a direct put_device.
1da177e4 2983 **/
ee959b00 2984static void scsi_disk_release(struct device *dev)
1da177e4 2985{
ee959b00 2986 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 2987 struct gendisk *disk = sdkp->disk;
2988
4034cc68 2989 spin_lock(&sd_index_lock);
f27bac27 2990 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 2991 spin_unlock(&sd_index_lock);
1da177e4
LT		 2992
2993 disk->private_data = NULL;
1da177e4 2994 put_disk(disk);
39b7f1e2 2995 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 2996
2997 kfree(sdkp);
2998}
2999
cc5d2c8c 3000static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 3001{
3002 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3003 struct scsi_sense_hdr sshdr;
cc5d2c8c 3004 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 3005 int res;
3006
3007 if (start)
3008 cmd[4] |= 1; /* START */
3009
d2886ea3
SR		 3010 if (sdp->start_stop_pwr_cond)
3011 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3012
c3c94c5a
TH		 3013 if (!scsi_device_online(sdp))
3014 return -ENODEV;
3015
3016 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
f4f4e47e 3017 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
c3c94c5a 3018 if (res) {
cc5d2c8c
JB		 3019 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3020 sd_print_result(sdkp, res);
c3c94c5a 3021 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 3022 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 3023 }
3024
3025 return res;
3026}
3027
1da177e4
LT		 3028/*
3029 * Send a SYNCHRONIZE CACHE instruction down to the device through
3030 * the normal SCSI command structure. Wait for the command to
3031 * complete.
3032 */
3033static void sd_shutdown(struct device *dev)
3034{
39b7f1e2 3035 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 3036
3037 if (!sdkp)
3038 return; /* this can happen */
3039
54f57588
LM		 3040 if (pm_runtime_suspended(dev))
3041 goto exit;
3042
39b7f1e2 3043 if (sdkp->WCE) {
e73aec82
MP		 3044 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3045 sd_sync_cache(sdkp);
39b7f1e2 3046 }
c3c94c5a 3047
cc5d2c8c
JB		 3048 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3049 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3050 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3051 }
3052
54f57588 3053exit:
39b7f1e2
AS		 3054 scsi_disk_put(sdkp);
3055}
1da177e4 3056
c3c94c5a
TH		 3057static int sd_suspend(struct device *dev, pm_message_t mesg)
3058{
c3c94c5a 3059 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3060 int ret = 0;
c3c94c5a
TH		 3061
3062 if (!sdkp)
3063 return 0; /* this can happen */
3064
3065 if (sdkp->WCE) {
cc5d2c8c 3066 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 3067 ret = sd_sync_cache(sdkp);
3068 if (ret)
09ff92fe 3069 goto done;
c3c94c5a
TH		 3070 }
3071
a0147563
AL		 3072 if (((mesg.event & PM_EVENT_SLEEP) || PMSG_IS_AUTO(mesg)) &&
3073 sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 3074 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3075 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 3076 }
3077
09ff92fe
AS		 3078done:
3079 scsi_disk_put(sdkp);
3080 return ret;
c3c94c5a
TH		 3081}
3082
3083static int sd_resume(struct device *dev)
3084{
c3c94c5a 3085 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 3086 int ret = 0;
c3c94c5a 3087
cc5d2c8c 3088 if (!sdkp->device->manage_start_stop)
09ff92fe 3089 goto done;
c3c94c5a 3090
cc5d2c8c 3091 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 3092 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 3093
09ff92fe
AS		 3094done:
3095 scsi_disk_put(sdkp);
3096 return ret;
c3c94c5a
TH		 3097}
3098
1da177e4
LT		 3099/**
3100 * init_sd - entry point for this driver (both when built in or when
3101 * a module).
3102 *
3103 * Note: this function registers this driver with the scsi mid-level.
3104 **/
3105static int __init init_sd(void)
3106{
5e4009ba 3107 int majors = 0, i, err;
1da177e4
LT		 3108
3109 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3110
3111 for (i = 0; i < SD_MAJORS; i++)
3112 if (register_blkdev(sd_major(i), "sd") == 0)
3113 majors++;
3114
3115 if (!majors)
3116 return -ENODEV;
3117
5e4009ba
JG		 3118 err = class_register(&sd_disk_class);
3119 if (err)
3120 goto err_out;
6bdaa1f1 3121
4e7392ec
MP		 3122 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3123 0, 0, NULL);
3124 if (!sd_cdb_cache) {
3125 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3126 goto err_out_class;
3127 }
3128
3129 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3130 if (!sd_cdb_pool) {
3131 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3132 goto err_out_cache;
3133 }
3134
afd5e34b
JD		 3135 err = scsi_register_driver(&sd_template.gendrv);
3136 if (err)
3137 goto err_out_driver;
3138
5e4009ba
JG		 3139 return 0;
3140
afd5e34b
JD		 3141err_out_driver:
3142 mempool_destroy(sd_cdb_pool);
3143
4e7392ec
MP		 3144err_out_cache:
3145 kmem_cache_destroy(sd_cdb_cache);
3146
5e4009ba
JG		 3147err_out_class:
3148 class_unregister(&sd_disk_class);
3149err_out:
3150 for (i = 0; i < SD_MAJORS; i++)
3151 unregister_blkdev(sd_major(i), "sd");
3152 return err;
1da177e4
LT		 3153}
3154
3155/**
3156 * exit_sd - exit point for this driver (when it is a module).
3157 *
3158 * Note: this function unregisters this driver from the scsi mid-level.
3159 **/
3160static void __exit exit_sd(void)
3161{
3162 int i;
3163
3164 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3165
afd5e34b 3166 scsi_unregister_driver(&sd_template.gendrv);
4e7392ec
MP		 3167 mempool_destroy(sd_cdb_pool);
3168 kmem_cache_destroy(sd_cdb_cache);
3169
5e4009ba
JG		 3170 class_unregister(&sd_disk_class);
3171
1da177e4
LT		 3172 for (i = 0; i < SD_MAJORS; i++)
3173 unregister_blkdev(sd_major(i), "sd");
3174}
3175
1da177e4
LT		 3176module_init(init_sd);
3177module_exit(exit_sd);
e73aec82
MP		 3178
3179static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3180 struct scsi_sense_hdr *sshdr)
3181{
2e4c3329 3182 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3183 scsi_show_sense_hdr(sshdr);
2e4c3329 3184 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3185 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3186}
3187
3188static void sd_print_result(struct scsi_disk *sdkp, int result)
3189{
2e4c3329 3190 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3191 scsi_show_result(result);
3192}
3193
kernel source for telekom puls (alcatel/mediatek)