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[SCSI] sd: Permit merged discard requests
[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);
7b3d9545 102static int sd_revalidate_disk(struct gendisk *);
72ec24bd 103static void sd_unlock_native_capacity(struct gendisk *disk);
7b3d9545
LT		 104static int sd_probe(struct device *);
105static int sd_remove(struct device *);
106static void sd_shutdown(struct device *);
107static int sd_suspend(struct device *, pm_message_t state);
108static int sd_resume(struct device *);
109static void sd_rescan(struct device *);
110static int sd_done(struct scsi_cmnd *);
18a4d0a2 111static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
7b3d9545 112static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
ee959b00 113static void scsi_disk_release(struct device *cdev);
7b3d9545
LT		 114static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
115static void sd_print_result(struct scsi_disk *, int);
116
4034cc68 117static DEFINE_SPINLOCK(sd_index_lock);
f27bac27 118static DEFINE_IDA(sd_index_ida);
1da177e4
LT		 119
120/* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
0b950672 123static DEFINE_MUTEX(sd_ref_mutex);
1da177e4 124
439d77f7
HS		 125static struct kmem_cache *sd_cdb_cache;
126static mempool_t *sd_cdb_pool;
4e7392ec 127
6bdaa1f1
JB		 128static const char *sd_cache_types[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
131};
132
ee959b00
TJ		 133static ssize_t
134sd_store_cache_type(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
6bdaa1f1
JB		 136{
137 int i, ct = -1, rcd, wce, sp;
ee959b00 138 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 139 struct scsi_device *sdp = sdkp->device;
140 char buffer[64];
141 char *buffer_data;
142 struct scsi_mode_data data;
143 struct scsi_sense_hdr sshdr;
144 int len;
145
146 if (sdp->type != TYPE_DISK)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
150 return -EINVAL;
151
6391a113 152 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
439d77f7 153 len = strlen(sd_cache_types[i]);
6bdaa1f1
JB		 154 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
155 buf[len] == '\n') {
156 ct = i;
157 break;
158 }
159 }
160 if (ct < 0)
161 return -EINVAL;
162 rcd = ct & 0x01 ? 1 : 0;
163 wce = ct & 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
165 SD_MAX_RETRIES, &data, NULL))
166 return -EINVAL;
a9312fb8 167 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
6bdaa1f1
JB		 168 data.block_descriptor_length);
169 buffer_data = buffer + data.header_length +
170 data.block_descriptor_length;
171 buffer_data[2] &= ~0x05;
172 buffer_data[2] |= wce << 2 | rcd;
173 sp = buffer_data[0] & 0x80 ? 1 : 0;
174
175 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
176 SD_MAX_RETRIES, &data, &sshdr)) {
177 if (scsi_sense_valid(&sshdr))
e73aec82 178 sd_print_sense_hdr(sdkp, &sshdr);
6bdaa1f1
JB		 179 return -EINVAL;
180 }
f98a8cae 181 revalidate_disk(sdkp->disk);
6bdaa1f1
JB		 182 return count;
183}
184
ee959b00
TJ		 185static ssize_t
186sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
c3c94c5a 188{
ee959b00 189 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 190 struct scsi_device *sdp = sdkp->device;
191
192 if (!capable(CAP_SYS_ADMIN))
193 return -EACCES;
194
195 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
196
197 return count;
198}
199
ee959b00
TJ		 200static ssize_t
201sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
a144c5ae 203{
ee959b00 204 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 205 struct scsi_device *sdp = sdkp->device;
206
207 if (!capable(CAP_SYS_ADMIN))
208 return -EACCES;
209
210 if (sdp->type != TYPE_DISK)
211 return -EINVAL;
212
213 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
214
215 return count;
216}
217
ee959b00
TJ		 218static ssize_t
219sd_show_cache_type(struct device *dev, struct device_attribute *attr,
220 char *buf)
6bdaa1f1 221{
ee959b00 222 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 223 int ct = sdkp->RCD + 2*sdkp->WCE;
224
225 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226}
227
ee959b00
TJ		 228static ssize_t
229sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
6bdaa1f1 230{
ee959b00 231 struct scsi_disk *sdkp = to_scsi_disk(dev);
6bdaa1f1
JB		 232
233 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234}
235
ee959b00
TJ		 236static ssize_t
237sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
238 char *buf)
c3c94c5a 239{
ee959b00 240 struct scsi_disk *sdkp = to_scsi_disk(dev);
c3c94c5a
TH		 241 struct scsi_device *sdp = sdkp->device;
242
243 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244}
245
ee959b00
TJ		 246static ssize_t
247sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
248 char *buf)
a144c5ae 249{
ee959b00 250 struct scsi_disk *sdkp = to_scsi_disk(dev);
a144c5ae
BK		 251
252 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253}
254
e0597d70
MP		 255static ssize_t
256sd_show_protection_type(struct device *dev, struct device_attribute *attr,
257 char *buf)
258{
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262}
263
8172499a
MP		 264static ssize_t
265sd_store_protection_type(struct device *dev, struct device_attribute *attr,
266 const char *buf, size_t count)
267{
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 unsigned int val;
270 int err;
271
272 if (!capable(CAP_SYS_ADMIN))
273 return -EACCES;
274
275 err = kstrtouint(buf, 10, &val);
276
277 if (err)
278 return err;
279
280 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
281 sdkp->protection_type = val;
282
283 return count;
284}
285
518fa8e3
MP		 286static ssize_t
287sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
288 char *buf)
289{
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
291 struct scsi_device *sdp = sdkp->device;
292 unsigned int dif, dix;
293
294 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
295 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
296
297 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
298 dif = 0;
299 dix = 1;
300 }
301
302 if (!dif && !dix)
303 return snprintf(buf, 20, "none\n");
304
305 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
306}
307
e0597d70
MP		 308static ssize_t
309sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
310 char *buf)
311{
312 struct scsi_disk *sdkp = to_scsi_disk(dev);
313
314 return snprintf(buf, 20, "%u\n", sdkp->ATO);
315}
316
e339c1a7
MP		 317static ssize_t
318sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
319 char *buf)
320{
321 struct scsi_disk *sdkp = to_scsi_disk(dev);
322
c98a0eb0
MP		 323 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
324}
325
326static const char *lbp_mode[] = {
327 [SD_LBP_FULL] = "full",
328 [SD_LBP_UNMAP] = "unmap",
329 [SD_LBP_WS16] = "writesame_16",
330 [SD_LBP_WS10] = "writesame_10",
331 [SD_LBP_ZERO] = "writesame_zero",
332 [SD_LBP_DISABLE] = "disabled",
333};
334
335static ssize_t
336sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
337 char *buf)
338{
339 struct scsi_disk *sdkp = to_scsi_disk(dev);
340
341 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
342}
343
344static ssize_t
345sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
346 const char *buf, size_t count)
347{
348 struct scsi_disk *sdkp = to_scsi_disk(dev);
349 struct scsi_device *sdp = sdkp->device;
350
351 if (!capable(CAP_SYS_ADMIN))
352 return -EACCES;
353
354 if (sdp->type != TYPE_DISK)
355 return -EINVAL;
356
357 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
358 sd_config_discard(sdkp, SD_LBP_UNMAP);
359 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
360 sd_config_discard(sdkp, SD_LBP_WS16);
361 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
362 sd_config_discard(sdkp, SD_LBP_WS10);
363 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
364 sd_config_discard(sdkp, SD_LBP_ZERO);
365 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
366 sd_config_discard(sdkp, SD_LBP_DISABLE);
367 else
368 return -EINVAL;
369
370 return count;
e339c1a7
MP		 371}
372
18a4d0a2
MP		 373static ssize_t
374sd_show_max_medium_access_timeouts(struct device *dev,
375 struct device_attribute *attr, char *buf)
376{
377 struct scsi_disk *sdkp = to_scsi_disk(dev);
378
379 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
380}
381
382static ssize_t
383sd_store_max_medium_access_timeouts(struct device *dev,
384 struct device_attribute *attr,
385 const char *buf, size_t count)
386{
387 struct scsi_disk *sdkp = to_scsi_disk(dev);
388 int err;
389
390 if (!capable(CAP_SYS_ADMIN))
391 return -EACCES;
392
393 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
394
395 return err ? err : count;
396}
397
ee959b00 398static struct device_attribute sd_disk_attrs[] = {
6bdaa1f1
JB		 399 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
400 sd_store_cache_type),
401 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
a144c5ae
BK		 402 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
403 sd_store_allow_restart),
c3c94c5a
TH		 404 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
405 sd_store_manage_start_stop),
8172499a
MP		 406 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
407 sd_store_protection_type),
518fa8e3 408 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
e0597d70 409 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
e339c1a7 410 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
c98a0eb0
MP		 411 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
412 sd_store_provisioning_mode),
18a4d0a2
MP		 413 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
414 sd_show_max_medium_access_timeouts,
415 sd_store_max_medium_access_timeouts),
6bdaa1f1
JB		 416 __ATTR_NULL,
417};
418
419static struct class sd_disk_class = {
420 .name = "scsi_disk",
421 .owner = THIS_MODULE,
ee959b00
TJ		 422 .dev_release = scsi_disk_release,
423 .dev_attrs = sd_disk_attrs,
6bdaa1f1 424};
1da177e4
LT		 425
426static struct scsi_driver sd_template = {
427 .owner = THIS_MODULE,
428 .gendrv = {
429 .name = "sd",
430 .probe = sd_probe,
431 .remove = sd_remove,
c3c94c5a
TH		 432 .suspend = sd_suspend,
433 .resume = sd_resume,
1da177e4
LT		 434 .shutdown = sd_shutdown,
435 },
436 .rescan = sd_rescan,
7b3d9545 437 .done = sd_done,
18a4d0a2 438 .eh_action = sd_eh_action,
1da177e4
LT		 439};
440
441/*
442 * Device no to disk mapping:
443 *
444 * major disc2 disc p1
445 * |............|.............|....|....| <- dev_t
446 * 31 20 19 8 7 4 3 0
447 *
448 * Inside a major, we have 16k disks, however mapped non-
449 * contiguously. The first 16 disks are for major0, the next
450 * ones with major1, ... Disk 256 is for major0 again, disk 272
451 * for major1, ...
452 * As we stay compatible with our numbering scheme, we can reuse
453 * the well-know SCSI majors 8, 65--71, 136--143.
454 */
455static int sd_major(int major_idx)
456{
457 switch (major_idx) {
458 case 0:
459 return SCSI_DISK0_MAJOR;
460 case 1 ... 7:
461 return SCSI_DISK1_MAJOR + major_idx - 1;
462 case 8 ... 15:
463 return SCSI_DISK8_MAJOR + major_idx - 8;
464 default:
465 BUG();
466 return 0; /* shut up gcc */
467 }
468}
469
39b7f1e2 470static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
1da177e4
LT		 471{
472 struct scsi_disk *sdkp = NULL;
473
39b7f1e2
AS		 474 if (disk->private_data) {
475 sdkp = scsi_disk(disk);
476 if (scsi_device_get(sdkp->device) == 0)
ee959b00 477 get_device(&sdkp->dev);
39b7f1e2
AS		 478 else
479 sdkp = NULL;
480 }
481 return sdkp;
482}
483
484static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
485{
486 struct scsi_disk *sdkp;
487
0b950672 488 mutex_lock(&sd_ref_mutex);
39b7f1e2 489 sdkp = __scsi_disk_get(disk);
0b950672 490 mutex_unlock(&sd_ref_mutex);
1da177e4 491 return sdkp;
39b7f1e2 492}
1da177e4 493
39b7f1e2
AS		 494static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
495{
496 struct scsi_disk *sdkp;
497
0b950672 498 mutex_lock(&sd_ref_mutex);
39b7f1e2
AS		 499 sdkp = dev_get_drvdata(dev);
500 if (sdkp)
501 sdkp = __scsi_disk_get(sdkp->disk);
0b950672 502 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 503 return sdkp;
504}
505
506static void scsi_disk_put(struct scsi_disk *sdkp)
507{
508 struct scsi_device *sdev = sdkp->device;
509
0b950672 510 mutex_lock(&sd_ref_mutex);
ee959b00 511 put_device(&sdkp->dev);
1da177e4 512 scsi_device_put(sdev);
0b950672 513 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 514}
515
35e1a5d9
MP		 516static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
517{
518 unsigned int prot_op = SCSI_PROT_NORMAL;
519 unsigned int dix = scsi_prot_sg_count(scmd);
520
521 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
522 if (dif && dix)
523 prot_op = SCSI_PROT_READ_PASS;
524 else if (dif && !dix)
525 prot_op = SCSI_PROT_READ_STRIP;
526 else if (!dif && dix)
527 prot_op = SCSI_PROT_READ_INSERT;
528 } else {
529 if (dif && dix)
530 prot_op = SCSI_PROT_WRITE_PASS;
531 else if (dif && !dix)
532 prot_op = SCSI_PROT_WRITE_INSERT;
533 else if (!dif && dix)
534 prot_op = SCSI_PROT_WRITE_STRIP;
535 }
536
537 scsi_set_prot_op(scmd, prot_op);
538 scsi_set_prot_type(scmd, dif);
539}
540
c98a0eb0
MP		 541static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
542{
543 struct request_queue *q = sdkp->disk->queue;
544 unsigned int logical_block_size = sdkp->device->sector_size;
545 unsigned int max_blocks = 0;
546
547 q->limits.discard_zeroes_data = sdkp->lbprz;
2a8cfad0
MP		 548 q->limits.discard_alignment = sdkp->unmap_alignment *
549 logical_block_size;
c98a0eb0
MP		 550 q->limits.discard_granularity =
551 max(sdkp->physical_block_size,
552 sdkp->unmap_granularity * logical_block_size);
553
89730393
MP		 554 sdkp->provisioning_mode = mode;
555
c98a0eb0
MP		 556 switch (mode) {
557
558 case SD_LBP_DISABLE:
559 q->limits.max_discard_sectors = 0;
560 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
561 return;
562
563 case SD_LBP_UNMAP:
564 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
565 break;
566
567 case SD_LBP_WS16:
568 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
569 break;
570
571 case SD_LBP_WS10:
572 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
573 break;
574
575 case SD_LBP_ZERO:
576 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
577 q->limits.discard_zeroes_data = 1;
578 break;
579 }
580
581 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
582 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
c98a0eb0
MP		 583}
584
e339c1a7 585/**
26e85fcd 586 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
66ac0280 587 * @sdp: scsi device to operate one
e339c1a7
MP		 588 * @rq: Request to prepare
589 *
590 * Will issue either UNMAP or WRITE SAME(16) depending on preference
591 * indicated by target device.
592 **/
26e85fcd 593static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
e339c1a7
MP		 594{
595 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
26e85fcd
MP		 596 sector_t sector = blk_rq_pos(rq);
597 unsigned int nr_sectors = blk_rq_sectors(rq);
598 unsigned int nr_bytes = blk_rq_bytes(rq);
66ac0280 599 unsigned int len;
f1126e95 600 int ret;
c98a0eb0 601 char *buf;
66ac0280 602 struct page *page;
e339c1a7 603
26e85fcd
MP		 604 sector >>= ilog2(sdp->sector_size) - 9;
605 nr_sectors >>= ilog2(sdp->sector_size) - 9;
e339c1a7
MP		 606 rq->timeout = SD_TIMEOUT;
607
608 memset(rq->cmd, 0, rq->cmd_len);
609
66ac0280
CH		 610 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
611 if (!page)
612 return BLKPREP_DEFER;
613
c98a0eb0
MP		 614 switch (sdkp->provisioning_mode) {
615 case SD_LBP_UNMAP:
616 buf = page_address(page);
e339c1a7 617
66ac0280 618 rq->cmd_len = 10;
e339c1a7
MP		 619 rq->cmd[0] = UNMAP;
620 rq->cmd[8] = 24;
e339c1a7
MP		 621
622 put_unaligned_be16(6 + 16, &buf[0]);
623 put_unaligned_be16(16, &buf[2]);
624 put_unaligned_be64(sector, &buf[8]);
66ac0280 625 put_unaligned_be32(nr_sectors, &buf[16]);
e339c1a7 626
66ac0280 627 len = 24;
c98a0eb0
MP		 628 break;
629
630 case SD_LBP_WS16:
66ac0280 631 rq->cmd_len = 16;
e339c1a7
MP		 632 rq->cmd[0] = WRITE_SAME_16;
633 rq->cmd[1] = 0x8; /* UNMAP */
634 put_unaligned_be64(sector, &rq->cmd[2]);
66ac0280
CH		 635 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
636
637 len = sdkp->device->sector_size;
c98a0eb0
MP		 638 break;
639
640 case SD_LBP_WS10:
641 case SD_LBP_ZERO:
642 rq->cmd_len = 10;
643 rq->cmd[0] = WRITE_SAME;
644 if (sdkp->provisioning_mode == SD_LBP_WS10)
645 rq->cmd[1] = 0x8; /* UNMAP */
646 put_unaligned_be32(sector, &rq->cmd[2]);
647 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
648
649 len = sdkp->device->sector_size;
650 break;
651
652 default:
09b9cc44 653 ret = BLKPREP_KILL;
c98a0eb0 654 goto out;
e339c1a7
MP		 655 }
656
66ac0280 657 blk_add_request_payload(rq, page, len);
f1126e95
FT		 658 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
659 rq->buffer = page_address(page);
26e85fcd 660 rq->__data_len = nr_bytes;
c98a0eb0
MP		 661
662out:
610a6349
FT		 663 if (ret != BLKPREP_OK) {
664 __free_page(page);
665 rq->buffer = NULL;
666 }
f1126e95
FT		 667 return ret;
668}
669
90467c29
FT		 670static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
671{
e3b3e624 672 rq->timeout = SD_FLUSH_TIMEOUT;
90467c29
FT		 673 rq->retries = SD_MAX_RETRIES;
674 rq->cmd[0] = SYNCHRONIZE_CACHE;
675 rq->cmd_len = 10;
676
677 return scsi_setup_blk_pc_cmnd(sdp, rq);
678}
679
f1126e95
FT		 680static void sd_unprep_fn(struct request_queue *q, struct request *rq)
681{
610a6349
FT		 682 if (rq->cmd_flags & REQ_DISCARD) {
683 free_page((unsigned long)rq->buffer);
684 rq->buffer = NULL;
685 }
e339c1a7
MP		 686}
687
1da177e4 688/**
2db93ce8 689 * sd_prep_fn - build a scsi (read or write) command from
1da177e4
LT		 690 * information in the request structure.
691 * @SCpnt: pointer to mid-level's per scsi command structure that
692 * contains request and into which the scsi command is written
693 *
694 * Returns 1 if successful and 0 if error (or cannot be done now).
695 **/
7f9a6bc4 696static int sd_prep_fn(struct request_queue *q, struct request *rq)
1da177e4 697{
7f9a6bc4
JB		 698 struct scsi_cmnd *SCpnt;
699 struct scsi_device *sdp = q->queuedata;
776b23a0 700 struct gendisk *disk = rq->rq_disk;
af55ff67 701 struct scsi_disk *sdkp;
83096ebf 702 sector_t block = blk_rq_pos(rq);
18351070 703 sector_t threshold;
83096ebf 704 unsigned int this_count = blk_rq_sectors(rq);
bd623e79 705 int ret, host_dif;
4e7392ec 706 unsigned char protect;
7f9a6bc4 707
e339c1a7
MP		 708 /*
709 * Discard request come in as REQ_TYPE_FS but we turn them into
710 * block PC requests to make life easier.
711 */
66ac0280 712 if (rq->cmd_flags & REQ_DISCARD) {
26e85fcd 713 ret = sd_setup_discard_cmnd(sdp, rq);
66ac0280 714 goto out;
90467c29
FT		 715 } else if (rq->cmd_flags & REQ_FLUSH) {
716 ret = scsi_setup_flush_cmnd(sdp, rq);
717 goto out;
66ac0280 718 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
7f9a6bc4
JB		 719 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
720 goto out;
721 } else if (rq->cmd_type != REQ_TYPE_FS) {
722 ret = BLKPREP_KILL;
723 goto out;
724 }
725 ret = scsi_setup_fs_cmnd(sdp, rq);
726 if (ret != BLKPREP_OK)
727 goto out;
728 SCpnt = rq->special;
af55ff67 729 sdkp = scsi_disk(disk);
7f9a6bc4
JB		 730
731 /* from here on until we're complete, any goto out
732 * is used for a killable error condition */
733 ret = BLKPREP_KILL;
1da177e4 734
fa0d34be 735 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
2db93ce8 736 "sd_prep_fn: block=%llu, "
fa0d34be
MP		 737 "count=%d\n",
738 (unsigned long long)block,
739 this_count));
1da177e4
LT		 740
741 if (!sdp || !scsi_device_online(sdp) ||
83096ebf 742 block + blk_rq_sectors(rq) > get_capacity(disk)) {
fa0d34be 743 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf
TH		 744 "Finishing %u sectors\n",
745 blk_rq_sectors(rq)));
fa0d34be
MP		 746 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
747 "Retry with 0x%p\n", SCpnt));
7f9a6bc4 748 goto out;
1da177e4
LT		 749 }
750
751 if (sdp->changed) {
752 /*
753 * quietly refuse to do anything to a changed disc until
754 * the changed bit has been reset
755 */
3ff5588d 756 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
7f9a6bc4 757 goto out;
1da177e4 758 }
7f9a6bc4 759
a0899d4d 760 /*
18351070
LT		 761 * Some SD card readers can't handle multi-sector accesses which touch
762 * the last one or two hardware sectors. Split accesses as needed.
a0899d4d 763 */
18351070
LT		 764 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
765 (sdp->sector_size / 512);
766
767 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
768 if (block < threshold) {
769 /* Access up to the threshold but not beyond */
770 this_count = threshold - block;
771 } else {
772 /* Access only a single hardware sector */
773 this_count = sdp->sector_size / 512;
774 }
775 }
a0899d4d 776
fa0d34be
MP		 777 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
778 (unsigned long long)block));
1da177e4
LT		 779
780 /*
781 * If we have a 1K hardware sectorsize, prevent access to single
782 * 512 byte sectors. In theory we could handle this - in fact
783 * the scsi cdrom driver must be able to handle this because
784 * we typically use 1K blocksizes, and cdroms typically have
785 * 2K hardware sectorsizes. Of course, things are simpler
786 * with the cdrom, since it is read-only. For performance
787 * reasons, the filesystems should be able to handle this
788 * and not force the scsi disk driver to use bounce buffers
789 * for this.
790 */
791 if (sdp->sector_size == 1024) {
83096ebf 792 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
e73aec82
MP		 793 scmd_printk(KERN_ERR, SCpnt,
794 "Bad block number requested\n");
7f9a6bc4 795 goto out;
1da177e4
LT		 796 } else {
797 block = block >> 1;
798 this_count = this_count >> 1;
799 }
800 }
801 if (sdp->sector_size == 2048) {
83096ebf 802 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
e73aec82
MP		 803 scmd_printk(KERN_ERR, SCpnt,
804 "Bad block number requested\n");
7f9a6bc4 805 goto out;
1da177e4
LT		 806 } else {
807 block = block >> 2;
808 this_count = this_count >> 2;
809 }
810 }
811 if (sdp->sector_size == 4096) {
83096ebf 812 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
e73aec82
MP		 813 scmd_printk(KERN_ERR, SCpnt,
814 "Bad block number requested\n");
7f9a6bc4 815 goto out;
1da177e4
LT		 816 } else {
817 block = block >> 3;
818 this_count = this_count >> 3;
819 }
820 }
821 if (rq_data_dir(rq) == WRITE) {
822 if (!sdp->writeable) {
7f9a6bc4 823 goto out;
1da177e4
LT		 824 }
825 SCpnt->cmnd[0] = WRITE_6;
826 SCpnt->sc_data_direction = DMA_TO_DEVICE;
af55ff67 827
8c579ab6
MP		 828 if (blk_integrity_rq(rq))
829 sd_dif_prepare(rq, block, sdp->sector_size);
af55ff67 830
1da177e4
LT		 831 } else if (rq_data_dir(rq) == READ) {
832 SCpnt->cmnd[0] = READ_6;
833 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
834 } else {
e73aec82 835 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
7f9a6bc4 836 goto out;
1da177e4
LT		 837 }
838
fa0d34be 839 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
83096ebf 840 "%s %d/%u 512 byte blocks.\n",
fa0d34be
MP		 841 (rq_data_dir(rq) == WRITE) ?
842 "writing" : "reading", this_count,
83096ebf 843 blk_rq_sectors(rq)));
1da177e4 844
af55ff67 845 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
bd623e79
MP		 846 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
847 if (host_dif)
4e7392ec 848 protect = 1 << 5;
af55ff67 849 else
4e7392ec
MP		 850 protect = 0;
851
852 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
853 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
854
855 if (unlikely(SCpnt->cmnd == NULL)) {
856 ret = BLKPREP_DEFER;
857 goto out;
858 }
af55ff67 859
4e7392ec
MP		 860 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
861 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
862 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
863 SCpnt->cmnd[7] = 0x18;
864 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
33659ebb 865 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
4e7392ec
MP		 866
867 /* LBA */
868 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
869 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
870 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
871 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
872 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
873 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
874 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
875 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
876
877 /* Expected Indirect LBA */
878 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
879 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
880 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
881 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
882
883 /* Transfer length */
884 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
885 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
886 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
887 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
888 } else if (block > 0xffffffff) {
1da177e4 889 SCpnt->cmnd[0] += READ_16 - READ_6;
33659ebb 890 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 891 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
892 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
893 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
894 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
895 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
896 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
897 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
898 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
899 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
900 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
901 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
902 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
903 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
904 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
af55ff67 905 scsi_device_protection(SCpnt->device) ||
1da177e4
LT		 906 SCpnt->device->use_10_for_rw) {
907 if (this_count > 0xffff)
908 this_count = 0xffff;
909
910 SCpnt->cmnd[0] += READ_10 - READ_6;
33659ebb 911 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1da177e4
LT		 912 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
913 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
914 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
915 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
916 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
917 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
918 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
919 } else {
33659ebb 920 if (unlikely(rq->cmd_flags & REQ_FUA)) {
007365ad
TH		 921 /*
922 * This happens only if this drive failed
923 * 10byte rw command with ILLEGAL_REQUEST
924 * during operation and thus turned off
925 * use_10_for_rw.
926 */
e73aec82
MP		 927 scmd_printk(KERN_ERR, SCpnt,
928 "FUA write on READ/WRITE(6) drive\n");
7f9a6bc4 929 goto out;
007365ad
TH		 930 }
931
1da177e4
LT		 932 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
933 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
934 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
935 SCpnt->cmnd[4] = (unsigned char) this_count;
936 SCpnt->cmnd[5] = 0;
937 }
30b0c37b 938 SCpnt->sdb.length = this_count * sdp->sector_size;
1da177e4 939
af55ff67 940 /* If DIF or DIX is enabled, tell HBA how to handle request */
bd623e79 941 if (host_dif || scsi_prot_sg_count(SCpnt))
35e1a5d9 942 sd_prot_op(SCpnt, host_dif);
af55ff67 943
1da177e4
LT		 944 /*
945 * We shouldn't disconnect in the middle of a sector, so with a dumb
946 * host adapter, it's safe to assume that we can at least transfer
947 * this many bytes between each connect / disconnect.
948 */
949 SCpnt->transfersize = sdp->sector_size;
950 SCpnt->underflow = this_count << 9;
951 SCpnt->allowed = SD_MAX_RETRIES;
1da177e4 952
1da177e4
LT		 953 /*
954 * This indicates that the command is ready from our end to be
955 * queued.
956 */
7f9a6bc4
JB		 957 ret = BLKPREP_OK;
958 out:
959 return scsi_prep_return(q, rq, ret);
1da177e4
LT		 960}
961
962/**
963 * sd_open - open a scsi disk device
964 * @inode: only i_rdev member may be used
965 * @filp: only f_mode and f_flags may be used
966 *
967 * Returns 0 if successful. Returns a negated errno value in case
968 * of error.
969 *
970 * Note: This can be called from a user context (e.g. fsck(1) )
971 * or from within the kernel (e.g. as a result of a mount(1) ).
972 * In the latter case @inode and @filp carry an abridged amount
973 * of information as noted above.
409f3499
AB		 974 *
975 * Locking: called with bdev->bd_mutex held.
1da177e4 976 **/
0338e291 977static int sd_open(struct block_device *bdev, fmode_t mode)
1da177e4 978{
0338e291 979 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1da177e4
LT		 980 struct scsi_device *sdev;
981 int retval;
982
0338e291 983 if (!sdkp)
1da177e4
LT		 984 return -ENXIO;
985
fa0d34be 986 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1da177e4
LT		 987
988 sdev = sdkp->device;
989
478a8a05
AS		 990 retval = scsi_autopm_get_device(sdev);
991 if (retval)
992 goto error_autopm;
993
1da177e4
LT		 994 /*
995 * If the device is in error recovery, wait until it is done.
996 * If the device is offline, then disallow any access to it.
997 */
998 retval = -ENXIO;
999 if (!scsi_block_when_processing_errors(sdev))
1000 goto error_out;
1001
1002 if (sdev->removable || sdkp->write_prot)
0338e291 1003 check_disk_change(bdev);
1da177e4
LT		 1004
1005 /*
1006 * If the drive is empty, just let the open fail.
1007 */
1008 retval = -ENOMEDIUM;
0338e291 1009 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1da177e4
LT		 1010 goto error_out;
1011
1012 /*
1013 * If the device has the write protect tab set, have the open fail
1014 * if the user expects to be able to write to the thing.
1015 */
1016 retval = -EROFS;
0338e291 1017 if (sdkp->write_prot && (mode & FMODE_WRITE))
1da177e4
LT		 1018 goto error_out;
1019
1020 /*
1021 * It is possible that the disk changing stuff resulted in
1022 * the device being taken offline. If this is the case,
1023 * report this to the user, and don't pretend that the
1024 * open actually succeeded.
1025 */
1026 retval = -ENXIO;
1027 if (!scsi_device_online(sdev))
1028 goto error_out;
1029
409f3499 1030 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1da177e4
LT		 1031 if (scsi_block_when_processing_errors(sdev))
1032 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1033 }
1034
1035 return 0;
1036
1037error_out:
478a8a05
AS		 1038 scsi_autopm_put_device(sdev);
1039error_autopm:
1da177e4
LT		 1040 scsi_disk_put(sdkp);
1041 return retval;
1042}
1043
1044/**
1045 * sd_release - invoked when the (last) close(2) is called on this
1046 * scsi disk.
1047 * @inode: only i_rdev member may be used
1048 * @filp: only f_mode and f_flags may be used
1049 *
1050 * Returns 0.
1051 *
1052 * Note: may block (uninterruptible) if error recovery is underway
1053 * on this disk.
409f3499
AB		 1054 *
1055 * Locking: called with bdev->bd_mutex held.
1da177e4 1056 **/
0338e291 1057static int sd_release(struct gendisk *disk, fmode_t mode)
1da177e4 1058{
1da177e4
LT		 1059 struct scsi_disk *sdkp = scsi_disk(disk);
1060 struct scsi_device *sdev = sdkp->device;
1061
56937f7b 1062 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1da177e4 1063
7e443312 1064 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1da177e4
LT		 1065 if (scsi_block_when_processing_errors(sdev))
1066 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1067 }
1068
1069 /*
1070 * XXX and what if there are packets in flight and this close()
1071 * XXX is followed by a "rmmod sd_mod"?
1072 */
478a8a05
AS		 1073
1074 scsi_autopm_put_device(sdev);
1da177e4
LT		 1075 scsi_disk_put(sdkp);
1076 return 0;
1077}
1078
a885c8c4 1079static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4
LT		 1080{
1081 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1082 struct scsi_device *sdp = sdkp->device;
1083 struct Scsi_Host *host = sdp->host;
1084 int diskinfo[4];
1085
1086 /* default to most commonly used values */
1087 diskinfo[0] = 0x40; /* 1 << 6 */
1088 diskinfo[1] = 0x20; /* 1 << 5 */
1089 diskinfo[2] = sdkp->capacity >> 11;
1090
1091 /* override with calculated, extended default, or driver values */
1092 if (host->hostt->bios_param)
1093 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1094 else
1095 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1096
a885c8c4
CH		 1097 geo->heads = diskinfo[0];
1098 geo->sectors = diskinfo[1];
1099 geo->cylinders = diskinfo[2];
1da177e4
LT		 1100 return 0;
1101}
1102
1103/**
1104 * sd_ioctl - process an ioctl
1105 * @inode: only i_rdev/i_bdev members may be used
1106 * @filp: only f_mode and f_flags may be used
1107 * @cmd: ioctl command number
1108 * @arg: this is third argument given to ioctl(2) system call.
1109 * Often contains a pointer.
1110 *
25985edc 1111 * Returns 0 if successful (some ioctls return positive numbers on
1da177e4
LT		 1112 * success as well). Returns a negated errno value in case of error.
1113 *
1114 * Note: most ioctls are forward onto the block subsystem or further
3a4fa0a2 1115 * down in the scsi subsystem.
1da177e4 1116 **/
0338e291 1117static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1da177e4
LT		 1118 unsigned int cmd, unsigned long arg)
1119{
1da177e4 1120 struct gendisk *disk = bdev->bd_disk;
fe2d1851
NN		 1121 struct scsi_disk *sdkp = scsi_disk(disk);
1122 struct scsi_device *sdp = sdkp->device;
1da177e4
LT		 1123 void __user *p = (void __user *)arg;
1124 int error;
1125
fe2d1851
NN		 1126 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1127 "cmd=0x%x\n", disk->disk_name, cmd));
1da177e4 1128
0bfc96cb
PB		 1129 error = scsi_verify_blk_ioctl(bdev, cmd);
1130 if (error < 0)
1131 return error;
1132
1da177e4
LT		 1133 /*
1134 * If we are in the middle of error recovery, don't let anyone
1135 * else try and use this device. Also, if error recovery fails, it
1136 * may try and take the device offline, in which case all further
1137 * access to the device is prohibited.
1138 */
83ff6fe8 1139 error = scsi_nonblockable_ioctl(sdp, cmd, p,
fd4ce1ac 1140 (mode & FMODE_NDELAY) != 0);
1da177e4 1141 if (!scsi_block_when_processing_errors(sdp) || !error)
8a6cfeb6 1142 goto out;
1da177e4 1143
1da177e4
LT		 1144 /*
1145 * Send SCSI addressing ioctls directly to mid level, send other
1146 * ioctls to block level and then onto mid level if they can't be
1147 * resolved.
1148 */
1149 switch (cmd) {
1150 case SCSI_IOCTL_GET_IDLUN:
1151 case SCSI_IOCTL_GET_BUS_NUMBER:
8a6cfeb6
AB		 1152 error = scsi_ioctl(sdp, cmd, p);
1153 break;
1da177e4 1154 default:
577ebb37 1155 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1da177e4 1156 if (error != -ENOTTY)
8a6cfeb6
AB		 1157 break;
1158 error = scsi_ioctl(sdp, cmd, p);
1159 break;
1da177e4 1160 }
8a6cfeb6 1161out:
8a6cfeb6 1162 return error;
1da177e4
LT		 1163}
1164
1165static void set_media_not_present(struct scsi_disk *sdkp)
1166{
2bae0093
TH		 1167 if (sdkp->media_present)
1168 sdkp->device->changed = 1;
1169
1170 if (sdkp->device->removable) {
1171 sdkp->media_present = 0;
1172 sdkp->capacity = 0;
1173 }
1174}
1175
1176static int media_not_present(struct scsi_disk *sdkp,
1177 struct scsi_sense_hdr *sshdr)
1178{
1179 if (!scsi_sense_valid(sshdr))
1180 return 0;
1181
1182 /* not invoked for commands that could return deferred errors */
1183 switch (sshdr->sense_key) {
1184 case UNIT_ATTENTION:
1185 case NOT_READY:
1186 /* medium not present */
1187 if (sshdr->asc == 0x3A) {
1188 set_media_not_present(sdkp);
1189 return 1;
1190 }
1191 }
1192 return 0;
1da177e4
LT		 1193}
1194
1195/**
2bae0093
TH		 1196 * sd_check_events - check media events
1197 * @disk: kernel device descriptor
1198 * @clearing: disk events currently being cleared
1da177e4 1199 *
2bae0093 1200 * Returns mask of DISK_EVENT_*.
1da177e4
LT		 1201 *
1202 * Note: this function is invoked from the block subsystem.
1203 **/
2bae0093 1204static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1da177e4
LT		 1205{
1206 struct scsi_disk *sdkp = scsi_disk(disk);
1207 struct scsi_device *sdp = sdkp->device;
001aac25 1208 struct scsi_sense_hdr *sshdr = NULL;
1da177e4
LT		 1209 int retval;
1210
2bae0093 1211 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1da177e4
LT		 1212
1213 /*
1214 * If the device is offline, don't send any commands - just pretend as
1215 * if the command failed. If the device ever comes back online, we
1216 * can deal with it then. It is only because of unrecoverable errors
1217 * that we would ever take a device offline in the first place.
1218 */
285e9670
KS		 1219 if (!scsi_device_online(sdp)) {
1220 set_media_not_present(sdkp);
285e9670
KS		 1221 goto out;
1222 }
1da177e4
LT		 1223
1224 /*
1225 * Using TEST_UNIT_READY enables differentiation between drive with
1226 * no cartridge loaded - NOT READY, drive with changed cartridge -
1227 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1228 *
1229 * Drives that auto spin down. eg iomega jaz 1G, will be started
1230 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1231 * sd_revalidate() is called.
1232 */
1233 retval = -ENODEV;
285e9670 1234
001aac25 1235 if (scsi_block_when_processing_errors(sdp)) {
4e2247b2
LT		 1236 retval = scsi_autopm_get_device(sdp);
1237 if (retval)
1238 goto out;
1239
001aac25
JB		 1240 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1241 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1242 sshdr);
4e2247b2 1243 scsi_autopm_put_device(sdp);
001aac25 1244 }
1da177e4 1245
2bae0093
TH		 1246 /* failed to execute TUR, assume media not present */
1247 if (host_byte(retval)) {
285e9670 1248 set_media_not_present(sdkp);
285e9670
KS		 1249 goto out;
1250 }
1da177e4 1251
2bae0093
TH		 1252 if (media_not_present(sdkp, sshdr))
1253 goto out;
1254
1da177e4
LT		 1255 /*
1256 * For removable scsi disk we have to recognise the presence
2bae0093 1257 * of a disk in the drive.
1da177e4 1258 */
2bae0093
TH		 1259 if (!sdkp->media_present)
1260 sdp->changed = 1;
1da177e4 1261 sdkp->media_present = 1;
285e9670 1262out:
3ff5588d 1263 /*
2bae0093 1264 * sdp->changed is set under the following conditions:
3ff5588d 1265 *
2bae0093
TH		 1266 * Medium present state has changed in either direction.
1267 * Device has indicated UNIT_ATTENTION.
3ff5588d 1268 */
001aac25 1269 kfree(sshdr);
2bae0093
TH		 1270 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1271 sdp->changed = 0;
1da177e4 1272 return retval;
1da177e4
LT		 1273}
1274
e73aec82 1275static int sd_sync_cache(struct scsi_disk *sdkp)
1da177e4 1276{
1da177e4 1277 int retries, res;
e73aec82 1278 struct scsi_device *sdp = sdkp->device;
ea73a9f2 1279 struct scsi_sense_hdr sshdr;
1da177e4
LT		 1280
1281 if (!scsi_device_online(sdp))
1282 return -ENODEV;
1283
1da177e4 1284
1da177e4
LT		 1285 for (retries = 3; retries > 0; --retries) {
1286 unsigned char cmd[10] = { 0 };
1287
1288 cmd[0] = SYNCHRONIZE_CACHE;
1289 /*
1290 * Leave the rest of the command zero to indicate
1291 * flush everything.
1292 */
ea73a9f2 1293 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
e3b3e624 1294 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
ea73a9f2 1295 if (res == 0)
1da177e4
LT		 1296 break;
1297 }
1298
e73aec82
MP		 1299 if (res) {
1300 sd_print_result(sdkp, res);
1301 if (driver_byte(res) & DRIVER_SENSE)
1302 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1303 }
1304
3721050a
TH		 1305 if (res)
1306 return -EIO;
1307 return 0;
1da177e4
LT		 1308}
1309
1da177e4
LT		 1310static void sd_rescan(struct device *dev)
1311{
39b7f1e2
AS		 1312 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1313
1314 if (sdkp) {
f98a8cae 1315 revalidate_disk(sdkp->disk);
39b7f1e2
AS		 1316 scsi_disk_put(sdkp);
1317 }
1da177e4
LT		 1318}
1319
1320
1321#ifdef CONFIG_COMPAT
1322/*
1323 * This gets directly called from VFS. When the ioctl
1324 * is not recognized we go back to the other translation paths.
1325 */
0338e291
AV		 1326static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1327 unsigned int cmd, unsigned long arg)
1da177e4 1328{
0338e291 1329 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
0bfc96cb
PB		 1330 int ret;
1331
1332 ret = scsi_verify_blk_ioctl(bdev, cmd);
1333 if (ret < 0)
1334 return ret;
1da177e4
LT		 1335
1336 /*
1337 * If we are in the middle of error recovery, don't let anyone
1338 * else try and use this device. Also, if error recovery fails, it
1339 * may try and take the device offline, in which case all further
1340 * access to the device is prohibited.
1341 */
1342 if (!scsi_block_when_processing_errors(sdev))
1343 return -ENODEV;
1344
1345 if (sdev->host->hostt->compat_ioctl) {
1da177e4
LT		 1346 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1347
1348 return ret;
1349 }
1350
1351 /*
1352 * Let the static ioctl translation table take care of it.
1353 */
1354 return -ENOIOCTLCMD;
1355}
1356#endif
1357
83d5cde4 1358static const struct block_device_operations sd_fops = {
1da177e4 1359 .owner = THIS_MODULE,
0338e291
AV		 1360 .open = sd_open,
1361 .release = sd_release,
8a6cfeb6 1362 .ioctl = sd_ioctl,
a885c8c4 1363 .getgeo = sd_getgeo,
1da177e4 1364#ifdef CONFIG_COMPAT
0338e291 1365 .compat_ioctl = sd_compat_ioctl,
1da177e4 1366#endif
2bae0093 1367 .check_events = sd_check_events,
1da177e4 1368 .revalidate_disk = sd_revalidate_disk,
72ec24bd 1369 .unlock_native_capacity = sd_unlock_native_capacity,
1da177e4
LT		 1370};
1371
18a4d0a2
MP		 1372/**
1373 * sd_eh_action - error handling callback
1374 * @scmd: sd-issued command that has failed
1375 * @eh_cmnd: The command that was sent during error handling
1376 * @eh_cmnd_len: Length of eh_cmnd in bytes
1377 * @eh_disp: The recovery disposition suggested by the midlayer
1378 *
1379 * This function is called by the SCSI midlayer upon completion of
1380 * an error handling command (TEST UNIT READY, START STOP UNIT,
1381 * etc.) The command sent to the device by the error handler is
1382 * stored in eh_cmnd. The result of sending the eh command is
1383 * passed in eh_disp.
1384 **/
1385static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1386 int eh_cmnd_len, int eh_disp)
1387{
1388 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1389
1390 if (!scsi_device_online(scmd->device) ||
1391 !scsi_medium_access_command(scmd))
1392 return eh_disp;
1393
1394 /*
1395 * The device has timed out executing a medium access command.
1396 * However, the TEST UNIT READY command sent during error
1397 * handling completed successfully. Either the device is in the
1398 * process of recovering or has it suffered an internal failure
1399 * that prevents access to the storage medium.
1400 */
1401 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1402 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1403 sdkp->medium_access_timed_out++;
1404
1405 /*
1406 * If the device keeps failing read/write commands but TEST UNIT
1407 * READY always completes successfully we assume that medium
1408 * access is no longer possible and take the device offline.
1409 */
1410 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1411 scmd_printk(KERN_ERR, scmd,
1412 "Medium access timeout failure. Offlining disk!\n");
1413 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1414
1415 return FAILED;
1416 }
1417
1418 return eh_disp;
1419}
1420
af55ff67
MP		 1421static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1422{
83096ebf
TH		 1423 u64 start_lba = blk_rq_pos(scmd->request);
1424 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
af55ff67
MP		 1425 u64 bad_lba;
1426 int info_valid;
a8733c7b
JB		 1427 /*
1428 * resid is optional but mostly filled in. When it's unused,
1429 * its value is zero, so we assume the whole buffer transferred
1430 */
1431 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1432 unsigned int good_bytes;
af55ff67 1433
33659ebb 1434 if (scmd->request->cmd_type != REQ_TYPE_FS)
af55ff67
MP		 1435 return 0;
1436
1437 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1438 SCSI_SENSE_BUFFERSIZE,
1439 &bad_lba);
1440 if (!info_valid)
1441 return 0;
1442
1443 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1444 return 0;
1445
1446 if (scmd->device->sector_size < 512) {
1447 /* only legitimate sector_size here is 256 */
1448 start_lba <<= 1;
1449 end_lba <<= 1;
1450 } else {
1451 /* be careful ... don't want any overflows */
1452 u64 factor = scmd->device->sector_size / 512;
1453 do_div(start_lba, factor);
1454 do_div(end_lba, factor);
1455 }
1456
1457 /* The bad lba was reported incorrectly, we have no idea where
1458 * the error is.
1459 */
1460 if (bad_lba < start_lba || bad_lba >= end_lba)
1461 return 0;
1462
1463 /* This computation should always be done in terms of
1464 * the resolution of the device's medium.
1465 */
a8733c7b
JB		 1466 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1467 return min(good_bytes, transferred);
af55ff67
MP		 1468}
1469
1da177e4 1470/**
7b3d9545 1471 * sd_done - bottom half handler: called when the lower level
1da177e4
LT		 1472 * driver has completed (successfully or otherwise) a scsi command.
1473 * @SCpnt: mid-level's per command structure.
1474 *
1475 * Note: potentially run from within an ISR. Must not block.
1476 **/
7b3d9545 1477static int sd_done(struct scsi_cmnd *SCpnt)
1da177e4
LT		 1478{
1479 int result = SCpnt->result;
af55ff67 1480 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1da177e4 1481 struct scsi_sense_hdr sshdr;
4e7392ec 1482 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
26e85fcd 1483 struct request *req = SCpnt->request;
1da177e4
LT		 1484 int sense_valid = 0;
1485 int sense_deferred = 0;
c98a0eb0 1486 unsigned char op = SCpnt->cmnd[0];
1da177e4 1487
26e85fcd
MP		 1488 if (req->cmd_flags & REQ_DISCARD) {
1489 if (!result) {
1490 good_bytes = blk_rq_bytes(req);
1491 scsi_set_resid(SCpnt, 0);
1492 } else {
1493 good_bytes = 0;
1494 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1495 }
1496 }
6a32a8ae 1497
1da177e4
LT		 1498 if (result) {
1499 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1500 if (sense_valid)
1501 sense_deferred = scsi_sense_is_deferred(&sshdr);
1502 }
1da177e4 1503#ifdef CONFIG_SCSI_LOGGING
fa0d34be 1504 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1da177e4 1505 if (sense_valid) {
fa0d34be 1506 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
7b3d9545 1507 "sd_done: sb[respc,sk,asc,"
fa0d34be
MP		 1508 "ascq]=%x,%x,%x,%x\n",
1509 sshdr.response_code,
1510 sshdr.sense_key, sshdr.asc,
1511 sshdr.ascq));
1da177e4
LT		 1512 }
1513#endif
03aba2f7
LT		 1514 if (driver_byte(result) != DRIVER_SENSE &&
1515 (!sense_valid || sense_deferred))
1516 goto out;
1517
18a4d0a2
MP		 1518 sdkp->medium_access_timed_out = 0;
1519
03aba2f7
LT		 1520 switch (sshdr.sense_key) {
1521 case HARDWARE_ERROR:
1522 case MEDIUM_ERROR:
af55ff67 1523 good_bytes = sd_completed_bytes(SCpnt);
03aba2f7
LT		 1524 break;
1525 case RECOVERED_ERROR:
af55ff67
MP		 1526 good_bytes = scsi_bufflen(SCpnt);
1527 break;
10dab226
JW		 1528 case NO_SENSE:
1529 /* This indicates a false check condition, so ignore it. An
1530 * unknown amount of data was transferred so treat it as an
1531 * error.
1532 */
1533 scsi_print_sense("sd", SCpnt);
1534 SCpnt->result = 0;
1535 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1536 break;
c98a0eb0
MP		 1537 case ABORTED_COMMAND:
1538 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1539 good_bytes = sd_completed_bytes(SCpnt);
1540 break;
1541 case ILLEGAL_REQUEST:
1542 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
af55ff67 1543 good_bytes = sd_completed_bytes(SCpnt);
c98a0eb0
MP		 1544 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1545 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1546 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1547 sd_config_discard(sdkp, SD_LBP_DISABLE);
03aba2f7
LT		 1548 break;
1549 default:
1550 break;
1da177e4 1551 }
03aba2f7 1552 out:
af55ff67
MP		 1553 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1554 sd_dif_complete(SCpnt, good_bytes);
1555
4e7392ec 1556 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
77c9cfc5
MP		 1557 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1558
1559 /* We have to print a failed command here as the
1560 * extended CDB gets freed before scsi_io_completion()
1561 * is called.
1562 */
1563 if (result)
1564 scsi_print_command(SCpnt);
1565
4e7392ec 1566 mempool_free(SCpnt->cmnd, sd_cdb_pool);
77c9cfc5
MP		 1567 SCpnt->cmnd = NULL;
1568 SCpnt->cmd_len = 0;
1569 }
4e7392ec 1570
7b3d9545 1571 return good_bytes;
1da177e4
LT		 1572}
1573
1da177e4
LT		 1574/*
1575 * spinup disk - called only in sd_revalidate_disk()
1576 */
1577static void
e73aec82 1578sd_spinup_disk(struct scsi_disk *sdkp)
ea73a9f2 1579{
1da177e4 1580 unsigned char cmd[10];
4451e472 1581 unsigned long spintime_expire = 0;
1da177e4
LT		 1582 int retries, spintime;
1583 unsigned int the_result;
1584 struct scsi_sense_hdr sshdr;
1585 int sense_valid = 0;
1586
1587 spintime = 0;
1588
1589 /* Spin up drives, as required. Only do this at boot time */
1590 /* Spinup needs to be done for module loads too. */
1591 do {
1592 retries = 0;
1593
1594 do {
1595 cmd[0] = TEST_UNIT_READY;
1596 memset((void *) &cmd[1], 0, 9);
1597
ea73a9f2
JB		 1598 the_result = scsi_execute_req(sdkp->device, cmd,
1599 DMA_NONE, NULL, 0,
1600 &sshdr, SD_TIMEOUT,
f4f4e47e 1601 SD_MAX_RETRIES, NULL);
1da177e4 1602
b4d38e38
AS		 1603 /*
1604 * If the drive has indicated to us that it
1605 * doesn't have any media in it, don't bother
1606 * with any more polling.
1607 */
1608 if (media_not_present(sdkp, &sshdr))
1609 return;
1610
1da177e4 1611 if (the_result)
ea73a9f2 1612 sense_valid = scsi_sense_valid(&sshdr);
1da177e4
LT		 1613 retries++;
1614 } while (retries < 3 &&
1615 (!scsi_status_is_good(the_result) ||
1616 ((driver_byte(the_result) & DRIVER_SENSE) &&
1617 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1618
1da177e4
LT		 1619 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1620 /* no sense, TUR either succeeded or failed
1621 * with a status error */
e73aec82
MP		 1622 if(!spintime && !scsi_status_is_good(the_result)) {
1623 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1624 sd_print_result(sdkp, the_result);
1625 }
1da177e4
LT		 1626 break;
1627 }
1628
1629 /*
1630 * The device does not want the automatic start to be issued.
1631 */
33dd6f92 1632 if (sdkp->device->no_start_on_add)
1da177e4 1633 break;
1da177e4 1634
33dd6f92
MW		 1635 if (sense_valid && sshdr.sense_key == NOT_READY) {
1636 if (sshdr.asc == 4 && sshdr.ascq == 3)
1637 break; /* manual intervention required */
1638 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1639 break; /* standby */
1640 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1641 break; /* unavailable */
1642 /*
1643 * Issue command to spin up drive when not ready
1644 */
1da177e4 1645 if (!spintime) {
e73aec82 1646 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1da177e4
LT		 1647 cmd[0] = START_STOP;
1648 cmd[1] = 1; /* Return immediately */
1649 memset((void *) &cmd[2], 0, 8);
1650 cmd[4] = 1; /* Start spin cycle */
d2886ea3
SR		 1651 if (sdkp->device->start_stop_pwr_cond)
1652 cmd[4] |= 1 << 4;
ea73a9f2
JB		 1653 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1654 NULL, 0, &sshdr,
f4f4e47e
FT		 1655 SD_TIMEOUT, SD_MAX_RETRIES,
1656 NULL);
4451e472
AS		 1657 spintime_expire = jiffies + 100 * HZ;
1658 spintime = 1;
1da177e4 1659 }
1da177e4
LT		 1660 /* Wait 1 second for next try */
1661 msleep(1000);
1662 printk(".");
4451e472
AS		 1663
1664 /*
1665 * Wait for USB flash devices with slow firmware.
1666 * Yes, this sense key/ASC combination shouldn't
1667 * occur here. It's characteristic of these devices.
1668 */
1669 } else if (sense_valid &&
1670 sshdr.sense_key == UNIT_ATTENTION &&
1671 sshdr.asc == 0x28) {
1672 if (!spintime) {
1673 spintime_expire = jiffies + 5 * HZ;
1674 spintime = 1;
1675 }
1676 /* Wait 1 second for next try */
1677 msleep(1000);
1da177e4
LT		 1678 } else {
1679 /* we don't understand the sense code, so it's
1680 * probably pointless to loop */
1681 if(!spintime) {
e73aec82
MP		 1682 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1683 sd_print_sense_hdr(sdkp, &sshdr);
1da177e4
LT		 1684 }
1685 break;
1686 }
1687
4451e472 1688 } while (spintime && time_before_eq(jiffies, spintime_expire));
1da177e4
LT		 1689
1690 if (spintime) {
1691 if (scsi_status_is_good(the_result))
1692 printk("ready\n");
1693 else
1694 printk("not responding...\n");
1695 }
1696}
1697
e0597d70
MP		 1698
1699/*
1700 * Determine whether disk supports Data Integrity Field.
1701 */
fe542396 1702static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 1703{
1704 struct scsi_device *sdp = sdkp->device;
1705 u8 type;
fe542396 1706 int ret = 0;
e0597d70
MP		 1707
1708 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
fe542396 1709 return ret;
35e1a5d9
MP		 1710
1711 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1712
fe542396
MP		 1713 if (type > SD_DIF_TYPE3_PROTECTION)
1714 ret = -ENODEV;
1715 else if (scsi_host_dif_capable(sdp->host, type))
1716 ret = 1;
1717
1718 if (sdkp->first_scan || type != sdkp->protection_type)
1719 switch (ret) {
1720 case -ENODEV:
1721 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1722 " protection type %u. Disabling disk!\n",
1723 type);
1724 break;
1725 case 1:
1726 sd_printk(KERN_NOTICE, sdkp,
1727 "Enabling DIF Type %u protection\n", type);
1728 break;
1729 case 0:
1730 sd_printk(KERN_NOTICE, sdkp,
1731 "Disabling DIF Type %u protection\n", type);
1732 break;
1733 }
e0597d70 1734
be922f47
MP		 1735 sdkp->protection_type = type;
1736
fe542396 1737 return ret;
e0597d70
MP		 1738}
1739
0da205e0
MW		 1740static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1741 struct scsi_sense_hdr *sshdr, int sense_valid,
1742 int the_result)
1743{
1744 sd_print_result(sdkp, the_result);
1745 if (driver_byte(the_result) & DRIVER_SENSE)
1746 sd_print_sense_hdr(sdkp, sshdr);
1747 else
1748 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1749
1750 /*
1751 * Set dirty bit for removable devices if not ready -
1752 * sometimes drives will not report this properly.
1753 */
1754 if (sdp->removable &&
1755 sense_valid && sshdr->sense_key == NOT_READY)
2bae0093 1756 set_media_not_present(sdkp);
0da205e0
MW		 1757
1758 /*
1759 * We used to set media_present to 0 here to indicate no media
1760 * in the drive, but some drives fail read capacity even with
1761 * media present, so we can't do that.
1762 */
1763 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1764}
1765
1766#define RC16_LEN 32
1767#if RC16_LEN > SD_BUF_SIZE
1768#error RC16_LEN must not be more than SD_BUF_SIZE
1769#endif
1770
3233ac19
JB		 1771#define READ_CAPACITY_RETRIES_ON_RESET 10
1772
0da205e0
MW		 1773static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1774 unsigned char *buffer)
ea73a9f2 1775{
1da177e4 1776 unsigned char cmd[16];
1da177e4
LT		 1777 struct scsi_sense_hdr sshdr;
1778 int sense_valid = 0;
0da205e0 1779 int the_result;
3233ac19 1780 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
ea09bcc9 1781 unsigned int alignment;
0da205e0
MW		 1782 unsigned long long lba;
1783 unsigned sector_size;
1da177e4 1784
5ce524bd
HG		 1785 if (sdp->no_read_capacity_16)
1786 return -EINVAL;
1787
1da177e4 1788 do {
0da205e0
MW		 1789 memset(cmd, 0, 16);
1790 cmd[0] = SERVICE_ACTION_IN;
1791 cmd[1] = SAI_READ_CAPACITY_16;
1792 cmd[13] = RC16_LEN;
1793 memset(buffer, 0, RC16_LEN);
1794
ea73a9f2 1795 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
0da205e0
MW		 1796 buffer, RC16_LEN, &sshdr,
1797 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1da177e4 1798
ea73a9f2 1799 if (media_not_present(sdkp, &sshdr))
0da205e0 1800 return -ENODEV;
1da177e4 1801
2b301307 1802 if (the_result) {
ea73a9f2 1803 sense_valid = scsi_sense_valid(&sshdr);
2b301307
MW		 1804 if (sense_valid &&
1805 sshdr.sense_key == ILLEGAL_REQUEST &&
1806 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1807 sshdr.ascq == 0x00)
1808 /* Invalid Command Operation Code or
1809 * Invalid Field in CDB, just retry
1810 * silently with RC10 */
1811 return -EINVAL;
3233ac19
JB		 1812 if (sense_valid &&
1813 sshdr.sense_key == UNIT_ATTENTION &&
1814 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1815 /* Device reset might occur several times,
1816 * give it one more chance */
1817 if (--reset_retries > 0)
1818 continue;
2b301307 1819 }
1da177e4
LT		 1820 retries--;
1821
1822 } while (the_result && retries);
1823
0da205e0 1824 if (the_result) {
e73aec82 1825 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
0da205e0
MW		 1826 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1827 return -EINVAL;
1828 }
e73aec82 1829
8f76d151
DH		 1830 sector_size = get_unaligned_be32(&buffer[8]);
1831 lba = get_unaligned_be64(&buffer[0]);
0da205e0 1832
fe542396
MP		 1833 if (sd_read_protection_type(sdkp, buffer) < 0) {
1834 sdkp->capacity = 0;
1835 return -ENODEV;
1836 }
0da205e0
MW		 1837
1838 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1839 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1840 "kernel compiled with support for large block "
1841 "devices.\n");
1842 sdkp->capacity = 0;
1843 return -EOVERFLOW;
1844 }
1845
ea09bcc9 1846 /* Logical blocks per physical block exponent */
526f7c79 1847 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
ea09bcc9
MP		 1848
1849 /* Lowest aligned logical block */
1850 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1851 blk_queue_alignment_offset(sdp->request_queue, alignment);
1852 if (alignment && sdkp->first_scan)
1853 sd_printk(KERN_NOTICE, sdkp,
1854 "physical block alignment offset: %u\n", alignment);
1855
c98a0eb0
MP		 1856 if (buffer[14] & 0x80) { /* LBPME */
1857 sdkp->lbpme = 1;
e339c1a7 1858
c98a0eb0
MP		 1859 if (buffer[14] & 0x40) /* LBPRZ */
1860 sdkp->lbprz = 1;
e339c1a7 1861
c98a0eb0 1862 sd_config_discard(sdkp, SD_LBP_WS16);
e339c1a7
MP		 1863 }
1864
0da205e0
MW		 1865 sdkp->capacity = lba + 1;
1866 return sector_size;
1867}
1868
1869static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1870 unsigned char *buffer)
1871{
1872 unsigned char cmd[16];
1873 struct scsi_sense_hdr sshdr;
1874 int sense_valid = 0;
1875 int the_result;
3233ac19 1876 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
0da205e0
MW		 1877 sector_t lba;
1878 unsigned sector_size;
1879
1880 do {
1881 cmd[0] = READ_CAPACITY;
1882 memset(&cmd[1], 0, 9);
1883 memset(buffer, 0, 8);
1884
1885 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1886 buffer, 8, &sshdr,
1887 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1888
1889 if (media_not_present(sdkp, &sshdr))
1890 return -ENODEV;
1891
3233ac19 1892 if (the_result) {
0da205e0 1893 sense_valid = scsi_sense_valid(&sshdr);
3233ac19
JB		 1894 if (sense_valid &&
1895 sshdr.sense_key == UNIT_ATTENTION &&
1896 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1897 /* Device reset might occur several times,
1898 * give it one more chance */
1899 if (--reset_retries > 0)
1900 continue;
1901 }
0da205e0
MW		 1902 retries--;
1903
1904 } while (the_result && retries);
1905
1906 if (the_result) {
1907 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1908 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1909 return -EINVAL;
1910 }
1911
8f76d151
DH		 1912 sector_size = get_unaligned_be32(&buffer[4]);
1913 lba = get_unaligned_be32(&buffer[0]);
0da205e0 1914
5ce524bd
HG		 1915 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1916 /* Some buggy (usb cardreader) devices return an lba of
1917 0xffffffff when the want to report a size of 0 (with
1918 which they really mean no media is present) */
1919 sdkp->capacity = 0;
5cc10350 1920 sdkp->physical_block_size = sector_size;
5ce524bd
HG		 1921 return sector_size;
1922 }
1923
0da205e0
MW		 1924 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1925 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1926 "kernel compiled with support for large block "
1927 "devices.\n");
1928 sdkp->capacity = 0;
1929 return -EOVERFLOW;
1930 }
1931
1932 sdkp->capacity = lba + 1;
526f7c79 1933 sdkp->physical_block_size = sector_size;
0da205e0
MW		 1934 return sector_size;
1935}
1936
2b301307
MW		 1937static int sd_try_rc16_first(struct scsi_device *sdp)
1938{
f87146bb
HR		 1939 if (sdp->host->max_cmd_len < 16)
1940 return 0;
6a0bdffa
AS		 1941 if (sdp->try_rc_10_first)
1942 return 0;
2b301307
MW		 1943 if (sdp->scsi_level > SCSI_SPC_2)
1944 return 1;
1945 if (scsi_device_protection(sdp))
1946 return 1;
1947 return 0;
1948}
1949
0da205e0
MW		 1950/*
1951 * read disk capacity
1952 */
1953static void
1954sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1955{
1956 int sector_size;
1957 struct scsi_device *sdp = sdkp->device;
70a9b873 1958 sector_t old_capacity = sdkp->capacity;
0da205e0 1959
2b301307 1960 if (sd_try_rc16_first(sdp)) {
0da205e0
MW		 1961 sector_size = read_capacity_16(sdkp, sdp, buffer);
1962 if (sector_size == -EOVERFLOW)
1da177e4 1963 goto got_data;
2b301307
MW		 1964 if (sector_size == -ENODEV)
1965 return;
1966 if (sector_size < 0)
1967 sector_size = read_capacity_10(sdkp, sdp, buffer);
0da205e0
MW		 1968 if (sector_size < 0)
1969 return;
1da177e4 1970 } else {
0da205e0
MW		 1971 sector_size = read_capacity_10(sdkp, sdp, buffer);
1972 if (sector_size == -EOVERFLOW)
1973 goto got_data;
1974 if (sector_size < 0)
1975 return;
1976 if ((sizeof(sdkp->capacity) > 4) &&
1977 (sdkp->capacity > 0xffffffffULL)) {
1978 int old_sector_size = sector_size;
1979 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1980 "Trying to use READ CAPACITY(16).\n");
1981 sector_size = read_capacity_16(sdkp, sdp, buffer);
1982 if (sector_size < 0) {
1983 sd_printk(KERN_NOTICE, sdkp,
1984 "Using 0xffffffff as device size\n");
1985 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1986 sector_size = old_sector_size;
1987 goto got_data;
1988 }
1989 }
1990 }
1da177e4 1991
5c211caa
AS		 1992 /* Some devices are known to return the total number of blocks,
1993 * not the highest block number. Some devices have versions
1994 * which do this and others which do not. Some devices we might
1995 * suspect of doing this but we don't know for certain.
1996 *
1997 * If we know the reported capacity is wrong, decrement it. If
1998 * we can only guess, then assume the number of blocks is even
1999 * (usually true but not always) and err on the side of lowering
2000 * the capacity.
2001 */
2002 if (sdp->fix_capacity ||
2003 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2004 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2005 "from its reported value: %llu\n",
2006 (unsigned long long) sdkp->capacity);
1da177e4 2007 --sdkp->capacity;
61bf54b7
ON		 2008 }
2009
1da177e4
LT		 2010got_data:
2011 if (sector_size == 0) {
2012 sector_size = 512;
e73aec82
MP		 2013 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2014 "assuming 512.\n");
1da177e4
LT		 2015 }
2016
2017 if (sector_size != 512 &&
2018 sector_size != 1024 &&
2019 sector_size != 2048 &&
2020 sector_size != 4096 &&
2021 sector_size != 256) {
e73aec82
MP		 2022 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2023 sector_size);
1da177e4
LT		 2024 /*
2025 * The user might want to re-format the drive with
2026 * a supported sectorsize. Once this happens, it
2027 * would be relatively trivial to set the thing up.
2028 * For this reason, we leave the thing in the table.
2029 */
2030 sdkp->capacity = 0;
2031 /*
2032 * set a bogus sector size so the normal read/write
2033 * logic in the block layer will eventually refuse any
2034 * request on this device without tripping over power
2035 * of two sector size assumptions
2036 */
2037 sector_size = 512;
2038 }
e1defc4f 2039 blk_queue_logical_block_size(sdp->request_queue, sector_size);
7404ad3b 2040
1da177e4 2041 {
7404ad3b 2042 char cap_str_2[10], cap_str_10[10];
520a2c27 2043 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1da177e4 2044
7404ad3b
JB		 2045 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2046 sizeof(cap_str_2));
2047 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2048 sizeof(cap_str_10));
1da177e4 2049
ea09bcc9 2050 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
70a9b873 2051 sd_printk(KERN_NOTICE, sdkp,
ea09bcc9 2052 "%llu %d-byte logical blocks: (%s/%s)\n",
70a9b873
MP		 2053 (unsigned long long)sdkp->capacity,
2054 sector_size, cap_str_10, cap_str_2);
ea09bcc9 2055
526f7c79 2056 if (sdkp->physical_block_size != sector_size)
ea09bcc9
MP		 2057 sd_printk(KERN_NOTICE, sdkp,
2058 "%u-byte physical blocks\n",
526f7c79 2059 sdkp->physical_block_size);
ea09bcc9 2060 }
1da177e4
LT		 2061 }
2062
2063 /* Rescale capacity to 512-byte units */
2064 if (sector_size == 4096)
2065 sdkp->capacity <<= 3;
2066 else if (sector_size == 2048)
2067 sdkp->capacity <<= 2;
2068 else if (sector_size == 1024)
2069 sdkp->capacity <<= 1;
2070 else if (sector_size == 256)
2071 sdkp->capacity >>= 1;
2072
526f7c79
MP		 2073 blk_queue_physical_block_size(sdp->request_queue,
2074 sdkp->physical_block_size);
1da177e4
LT		 2075 sdkp->device->sector_size = sector_size;
2076}
2077
2078/* called with buffer of length 512 */
2079static inline int
ea73a9f2
JB		 2080sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2081 unsigned char *buffer, int len, struct scsi_mode_data *data,
2082 struct scsi_sense_hdr *sshdr)
1da177e4 2083{
ea73a9f2 2084 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1cf72699 2085 SD_TIMEOUT, SD_MAX_RETRIES, data,
ea73a9f2 2086 sshdr);
1da177e4
LT		 2087}
2088
2089/*
2090 * read write protect setting, if possible - called only in sd_revalidate_disk()
48970800 2091 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2092 */
2093static void
e73aec82 2094sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
ea73a9f2 2095{
1da177e4 2096 int res;
ea73a9f2 2097 struct scsi_device *sdp = sdkp->device;
1da177e4 2098 struct scsi_mode_data data;
70a9b873 2099 int old_wp = sdkp->write_prot;
1da177e4
LT		 2100
2101 set_disk_ro(sdkp->disk, 0);
ea73a9f2 2102 if (sdp->skip_ms_page_3f) {
e73aec82 2103 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1da177e4
LT		 2104 return;
2105 }
2106
ea73a9f2
JB		 2107 if (sdp->use_192_bytes_for_3f) {
2108 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1da177e4
LT		 2109 } else {
2110 /*
2111 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2112 * We have to start carefully: some devices hang if we ask
2113 * for more than is available.
2114 */
ea73a9f2 2115 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1da177e4
LT		 2116
2117 /*
2118 * Second attempt: ask for page 0 When only page 0 is
2119 * implemented, a request for page 3F may return Sense Key
2120 * 5: Illegal Request, Sense Code 24: Invalid field in
2121 * CDB.
2122 */
2123 if (!scsi_status_is_good(res))
ea73a9f2 2124 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1da177e4
LT		 2125
2126 /*
2127 * Third attempt: ask 255 bytes, as we did earlier.
2128 */
2129 if (!scsi_status_is_good(res))
ea73a9f2
JB		 2130 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2131 &data, NULL);
1da177e4
LT		 2132 }
2133
2134 if (!scsi_status_is_good(res)) {
e73aec82
MP		 2135 sd_printk(KERN_WARNING, sdkp,
2136 "Test WP failed, assume Write Enabled\n");
1da177e4
LT		 2137 } else {
2138 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2139 set_disk_ro(sdkp->disk, sdkp->write_prot);
70a9b873
MP		 2140 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2141 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2142 sdkp->write_prot ? "on" : "off");
2143 sd_printk(KERN_DEBUG, sdkp,
2144 "Mode Sense: %02x %02x %02x %02x\n",
2145 buffer[0], buffer[1], buffer[2], buffer[3]);
2146 }
1da177e4
LT		 2147 }
2148}
2149
2150/*
2151 * sd_read_cache_type - called only from sd_revalidate_disk()
48970800 2152 * called with buffer of length SD_BUF_SIZE
1da177e4
LT		 2153 */
2154static void
e73aec82 2155sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
631e8a13 2156{
1da177e4 2157 int len = 0, res;
ea73a9f2 2158 struct scsi_device *sdp = sdkp->device;
1da177e4 2159
631e8a13
AV		 2160 int dbd;
2161 int modepage;
0bcaa111 2162 int first_len;
1da177e4
LT		 2163 struct scsi_mode_data data;
2164 struct scsi_sense_hdr sshdr;
70a9b873
MP		 2165 int old_wce = sdkp->WCE;
2166 int old_rcd = sdkp->RCD;
2167 int old_dpofua = sdkp->DPOFUA;
1da177e4 2168
0bcaa111
LT		 2169 first_len = 4;
2170 if (sdp->skip_ms_page_8) {
2171 if (sdp->type == TYPE_RBC)
2172 goto defaults;
2173 else {
2174 if (sdp->skip_ms_page_3f)
2175 goto defaults;
2176 modepage = 0x3F;
2177 if (sdp->use_192_bytes_for_3f)
2178 first_len = 192;
2179 dbd = 0;
2180 }
2181 } else if (sdp->type == TYPE_RBC) {
631e8a13
AV		 2182 modepage = 6;
2183 dbd = 8;
2184 } else {
2185 modepage = 8;
2186 dbd = 0;
2187 }
2188
1da177e4 2189 /* cautiously ask */
0bcaa111
LT		 2190 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2191 &data, &sshdr);
1da177e4
LT		 2192
2193 if (!scsi_status_is_good(res))
2194 goto bad_sense;
2195
6d73c851
AV		 2196 if (!data.header_length) {
2197 modepage = 6;
0bcaa111 2198 first_len = 0;
e73aec82 2199 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
6d73c851
AV		 2200 }
2201
1da177e4
LT		 2202 /* that went OK, now ask for the proper length */
2203 len = data.length;
2204
2205 /*
2206 * We're only interested in the first three bytes, actually.
2207 * But the data cache page is defined for the first 20.
2208 */
2209 if (len < 3)
2210 goto bad_sense;
0bcaa111
LT		 2211 else if (len > SD_BUF_SIZE) {
2212 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2213 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2214 len = SD_BUF_SIZE;
2215 }
2216 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2217 len = 192;
1da177e4
LT		 2218
2219 /* Get the data */
0bcaa111
LT		 2220 if (len > first_len)
2221 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2222 &data, &sshdr);
1da177e4
LT		 2223
2224 if (scsi_status_is_good(res)) {
631e8a13 2225 int offset = data.header_length + data.block_descriptor_length;
1da177e4 2226
0bcaa111
LT		 2227 while (offset < len) {
2228 u8 page_code = buffer[offset] & 0x3F;
2229 u8 spf = buffer[offset] & 0x40;
2230
2231 if (page_code == 8 || page_code == 6) {
2232 /* We're interested only in the first 3 bytes.
2233 */
2234 if (len - offset <= 2) {
2235 sd_printk(KERN_ERR, sdkp, "Incomplete "
2236 "mode parameter data\n");
2237 goto defaults;
2238 } else {
2239 modepage = page_code;
2240 goto Page_found;
2241 }
2242 } else {
2243 /* Go to the next page */
2244 if (spf && len - offset > 3)
2245 offset += 4 + (buffer[offset+2] << 8) +
2246 buffer[offset+3];
2247 else if (!spf && len - offset > 1)
2248 offset += 2 + buffer[offset+1];
2249 else {
2250 sd_printk(KERN_ERR, sdkp, "Incomplete "
2251 "mode parameter data\n");
2252 goto defaults;
2253 }
2254 }
48970800
AV		 2255 }
2256
0bcaa111
LT		 2257 if (modepage == 0x3F) {
2258 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2259 "present\n");
2260 goto defaults;
2261 } else if ((buffer[offset] & 0x3f) != modepage) {
e73aec82 2262 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
631e8a13
AV		 2263 goto defaults;
2264 }
0bcaa111 2265 Page_found:
631e8a13
AV		 2266 if (modepage == 8) {
2267 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2268 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2269 } else {
2270 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2271 sdkp->RCD = 0;
2272 }
1da177e4 2273
007365ad
TH		 2274 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2275 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
e73aec82
MP		 2276 sd_printk(KERN_NOTICE, sdkp,
2277 "Uses READ/WRITE(6), disabling FUA\n");
007365ad
TH		 2278 sdkp->DPOFUA = 0;
2279 }
2280
70a9b873
MP		 2281 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2282 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2283 sd_printk(KERN_NOTICE, sdkp,
2284 "Write cache: %s, read cache: %s, %s\n",
2285 sdkp->WCE ? "enabled" : "disabled",
2286 sdkp->RCD ? "disabled" : "enabled",
2287 sdkp->DPOFUA ? "supports DPO and FUA"
2288 : "doesn't support DPO or FUA");
1da177e4
LT		 2289
2290 return;
2291 }
2292
2293bad_sense:
ea73a9f2 2294 if (scsi_sense_valid(&sshdr) &&
1da177e4
LT		 2295 sshdr.sense_key == ILLEGAL_REQUEST &&
2296 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
e73aec82
MP		 2297 /* Invalid field in CDB */
2298 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1da177e4 2299 else
e73aec82 2300 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1da177e4
LT		 2301
2302defaults:
b81478d8
NJ		 2303 if (sdp->wce_default_on) {
2304 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2305 sdkp->WCE = 1;
2306 } else {
2307 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2308 sdkp->WCE = 0;
2309 }
1da177e4 2310 sdkp->RCD = 0;
48970800 2311 sdkp->DPOFUA = 0;
1da177e4
LT		 2312}
2313
e0597d70
MP		 2314/*
2315 * The ATO bit indicates whether the DIF application tag is available
2316 * for use by the operating system.
2317 */
439d77f7 2318static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
e0597d70
MP		 2319{
2320 int res, offset;
2321 struct scsi_device *sdp = sdkp->device;
2322 struct scsi_mode_data data;
2323 struct scsi_sense_hdr sshdr;
2324
2325 if (sdp->type != TYPE_DISK)
2326 return;
2327
2328 if (sdkp->protection_type == 0)
2329 return;
2330
2331 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2332 SD_MAX_RETRIES, &data, &sshdr);
2333
2334 if (!scsi_status_is_good(res) || !data.header_length ||
2335 data.length < 6) {
2336 sd_printk(KERN_WARNING, sdkp,
2337 "getting Control mode page failed, assume no ATO\n");
2338
2339 if (scsi_sense_valid(&sshdr))
2340 sd_print_sense_hdr(sdkp, &sshdr);
2341
2342 return;
2343 }
2344
2345 offset = data.header_length + data.block_descriptor_length;
2346
2347 if ((buffer[offset] & 0x3f) != 0x0a) {
2348 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2349 return;
2350 }
2351
2352 if ((buffer[offset + 5] & 0x80) == 0)
2353 return;
2354
2355 sdkp->ATO = 1;
2356
2357 return;
2358}
2359
d11b6916
MP		 2360/**
2361 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2362 * @disk: disk to query
2363 */
2364static void sd_read_block_limits(struct scsi_disk *sdkp)
2365{
2366 unsigned int sector_sz = sdkp->device->sector_size;
bb2d3de1 2367 const int vpd_len = 64;
e3deec09 2368 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
d11b6916 2369
e3deec09
JB		 2370 if (!buffer ||
2371 /* Block Limits VPD */
2372 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2373 goto out;
d11b6916
MP		 2374
2375 blk_queue_io_min(sdkp->disk->queue,
2376 get_unaligned_be16(&buffer[6]) * sector_sz);
2377 blk_queue_io_opt(sdkp->disk->queue,
2378 get_unaligned_be32(&buffer[12]) * sector_sz);
2379
c98a0eb0
MP		 2380 if (buffer[3] == 0x3c) {
2381 unsigned int lba_count, desc_count;
e339c1a7 2382
c98a0eb0
MP		 2383 sdkp->max_ws_blocks =
2384 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2385 (u64)0xffffffff);
e339c1a7 2386
c98a0eb0 2387 if (!sdkp->lbpme)
045d3fe7 2388 goto out;
045d3fe7 2389
c98a0eb0
MP		 2390 lba_count = get_unaligned_be32(&buffer[20]);
2391 desc_count = get_unaligned_be32(&buffer[24]);
045d3fe7 2392
c98a0eb0
MP		 2393 if (lba_count && desc_count)
2394 sdkp->max_unmap_blocks = lba_count;
e339c1a7 2395
c98a0eb0 2396 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
e339c1a7
MP		 2397
2398 if (buffer[32] & 0x80)
c98a0eb0 2399 sdkp->unmap_alignment =
e339c1a7 2400 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
c98a0eb0
MP		 2401
2402 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2403
2404 if (sdkp->max_unmap_blocks)
2405 sd_config_discard(sdkp, SD_LBP_UNMAP);
2406 else
2407 sd_config_discard(sdkp, SD_LBP_WS16);
2408
2409 } else { /* LBP VPD page tells us what to use */
2410
2411 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2412 sd_config_discard(sdkp, SD_LBP_UNMAP);
2413 else if (sdkp->lbpws)
2414 sd_config_discard(sdkp, SD_LBP_WS16);
2415 else if (sdkp->lbpws10)
2416 sd_config_discard(sdkp, SD_LBP_WS10);
2417 else
2418 sd_config_discard(sdkp, SD_LBP_DISABLE);
2419 }
e339c1a7
MP		 2420 }
2421
e3deec09 2422 out:
d11b6916
MP		 2423 kfree(buffer);
2424}
2425
3821d768
MP		 2426/**
2427 * sd_read_block_characteristics - Query block dev. characteristics
2428 * @disk: disk to query
2429 */
2430static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2431{
e3deec09 2432 unsigned char *buffer;
3821d768 2433 u16 rot;
bb2d3de1 2434 const int vpd_len = 64;
3821d768 2435
e3deec09 2436 buffer = kmalloc(vpd_len, GFP_KERNEL);
3821d768 2437
e3deec09
JB		 2438 if (!buffer ||
2439 /* Block Device Characteristics VPD */
2440 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2441 goto out;
3821d768
MP		 2442
2443 rot = get_unaligned_be16(&buffer[4]);
2444
2445 if (rot == 1)
2446 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2447
e3deec09 2448 out:
3821d768
MP		 2449 kfree(buffer);
2450}
2451
045d3fe7 2452/**
c98a0eb0 2453 * sd_read_block_provisioning - Query provisioning VPD page
045d3fe7
MP		 2454 * @disk: disk to query
2455 */
c98a0eb0 2456static void sd_read_block_provisioning(struct scsi_disk *sdkp)
045d3fe7
MP		 2457{
2458 unsigned char *buffer;
2459 const int vpd_len = 8;
2460
c98a0eb0 2461 if (sdkp->lbpme == 0)
045d3fe7
MP		 2462 return;
2463
2464 buffer = kmalloc(vpd_len, GFP_KERNEL);
2465
2466 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2467 goto out;
2468
c98a0eb0
MP		 2469 sdkp->lbpvpd = 1;
2470 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2471 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2472 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
045d3fe7
MP		 2473
2474 out:
2475 kfree(buffer);
2476}
2477
ffd4bc2a
MP		 2478static int sd_try_extended_inquiry(struct scsi_device *sdp)
2479{
2480 /*
2481 * Although VPD inquiries can go to SCSI-2 type devices,
2482 * some USB ones crash on receiving them, and the pages
2483 * we currently ask for are for SPC-3 and beyond
2484 */
09b6b51b 2485 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
ffd4bc2a
MP		 2486 return 1;
2487 return 0;
2488}
2489
1da177e4
LT		 2490/**
2491 * sd_revalidate_disk - called the first time a new disk is seen,
2492 * performs disk spin up, read_capacity, etc.
2493 * @disk: struct gendisk we care about
2494 **/
2495static int sd_revalidate_disk(struct gendisk *disk)
2496{
2497 struct scsi_disk *sdkp = scsi_disk(disk);
2498 struct scsi_device *sdp = sdkp->device;
1da177e4 2499 unsigned char *buffer;
4913efe4 2500 unsigned flush = 0;
1da177e4 2501
fa0d34be
MP		 2502 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2503 "sd_revalidate_disk\n"));
1da177e4
LT		 2504
2505 /*
2506 * If the device is offline, don't try and read capacity or any
2507 * of the other niceties.
2508 */
2509 if (!scsi_device_online(sdp))
2510 goto out;
2511
a6123f14 2512 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1da177e4 2513 if (!buffer) {
e73aec82
MP		 2514 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2515 "allocation failure.\n");
ea73a9f2 2516 goto out;
1da177e4
LT		 2517 }
2518
e73aec82 2519 sd_spinup_disk(sdkp);
1da177e4
LT		 2520
2521 /*
2522 * Without media there is no reason to ask; moreover, some devices
2523 * react badly if we do.
2524 */
2525 if (sdkp->media_present) {
e73aec82 2526 sd_read_capacity(sdkp, buffer);
ffd4bc2a
MP		 2527
2528 if (sd_try_extended_inquiry(sdp)) {
c98a0eb0 2529 sd_read_block_provisioning(sdkp);
ffd4bc2a
MP		 2530 sd_read_block_limits(sdkp);
2531 sd_read_block_characteristics(sdkp);
2532 }
2533
e73aec82
MP		 2534 sd_read_write_protect_flag(sdkp, buffer);
2535 sd_read_cache_type(sdkp, buffer);
e0597d70 2536 sd_read_app_tag_own(sdkp, buffer);
1da177e4 2537 }
461d4e90 2538
70a9b873
MP		 2539 sdkp->first_scan = 0;
2540
461d4e90
TH		 2541 /*
2542 * We now have all cache related info, determine how we deal
4913efe4 2543 * with flush requests.
461d4e90 2544 */
4913efe4
TH		 2545 if (sdkp->WCE) {
2546 flush |= REQ_FLUSH;
2547 if (sdkp->DPOFUA)
2548 flush |= REQ_FUA;
2549 }
461d4e90 2550
4913efe4 2551 blk_queue_flush(sdkp->disk->queue, flush);
461d4e90 2552
1da177e4
LT		 2553 set_capacity(disk, sdkp->capacity);
2554 kfree(buffer);
2555
1da177e4
LT		 2556 out:
2557 return 0;
2558}
2559
72ec24bd
TH		 2560/**
2561 * sd_unlock_native_capacity - unlock native capacity
2562 * @disk: struct gendisk to set capacity for
2563 *
2564 * Block layer calls this function if it detects that partitions
2565 * on @disk reach beyond the end of the device. If the SCSI host
2566 * implements ->unlock_native_capacity() method, it's invoked to
2567 * give it a chance to adjust the device capacity.
2568 *
2569 * CONTEXT:
2570 * Defined by block layer. Might sleep.
2571 */
2572static void sd_unlock_native_capacity(struct gendisk *disk)
2573{
2574 struct scsi_device *sdev = scsi_disk(disk)->device;
2575
2576 if (sdev->host->hostt->unlock_native_capacity)
2577 sdev->host->hostt->unlock_native_capacity(sdev);
2578}
2579
3e1a7ff8
TH		 2580/**
2581 * sd_format_disk_name - format disk name
2582 * @prefix: name prefix - ie. "sd" for SCSI disks
2583 * @index: index of the disk to format name for
2584 * @buf: output buffer
2585 * @buflen: length of the output buffer
2586 *
2587 * SCSI disk names starts at sda. The 26th device is sdz and the
2588 * 27th is sdaa. The last one for two lettered suffix is sdzz
2589 * which is followed by sdaaa.
2590 *
2591 * This is basically 26 base counting with one extra 'nil' entry
3ad2f3fb 2592 * at the beginning from the second digit on and can be
3e1a7ff8
TH		 2593 * determined using similar method as 26 base conversion with the
2594 * index shifted -1 after each digit is computed.
2595 *
2596 * CONTEXT:
2597 * Don't care.
2598 *
2599 * RETURNS:
2600 * 0 on success, -errno on failure.
2601 */
2602static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2603{
2604 const int base = 'z' - 'a' + 1;
2605 char *begin = buf + strlen(prefix);
2606 char *end = buf + buflen;
2607 char *p;
2608 int unit;
2609
2610 p = end - 1;
2611 *p = '\0';
2612 unit = base;
2613 do {
2614 if (p == begin)
2615 return -EINVAL;
2616 *--p = 'a' + (index % unit);
2617 index = (index / unit) - 1;
2618 } while (index >= 0);
2619
2620 memmove(begin, p, end - p);
2621 memcpy(buf, prefix, strlen(prefix));
2622
2623 return 0;
2624}
2625
4ace92fc
AV		 2626/*
2627 * The asynchronous part of sd_probe
2628 */
2629static void sd_probe_async(void *data, async_cookie_t cookie)
2630{
2631 struct scsi_disk *sdkp = data;
2632 struct scsi_device *sdp;
2633 struct gendisk *gd;
2634 u32 index;
2635 struct device *dev;
2636
2637 sdp = sdkp->device;
2638 gd = sdkp->disk;
2639 index = sdkp->index;
2640 dev = &sdp->sdev_gendev;
2641
1a03ae0f
MR		 2642 gd->major = sd_major((index & 0xf0) >> 4);
2643 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2644 gd->minors = SD_MINORS;
2645
4ace92fc
AV		 2646 gd->fops = &sd_fops;
2647 gd->private_data = &sdkp->driver;
2648 gd->queue = sdkp->device->request_queue;
2649
70a9b873
MP		 2650 /* defaults, until the device tells us otherwise */
2651 sdp->sector_size = 512;
2652 sdkp->capacity = 0;
2653 sdkp->media_present = 1;
2654 sdkp->write_prot = 0;
2655 sdkp->WCE = 0;
2656 sdkp->RCD = 0;
2657 sdkp->ATO = 0;
2658 sdkp->first_scan = 1;
18a4d0a2 2659 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
70a9b873 2660
4ace92fc
AV		 2661 sd_revalidate_disk(gd);
2662
2663 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
f1126e95 2664 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
4ace92fc
AV		 2665
2666 gd->driverfs_dev = &sdp->sdev_gendev;
97fedbbe 2667 gd->flags = GENHD_FL_EXT_DEVT;
2bae0093 2668 if (sdp->removable) {
4ace92fc 2669 gd->flags |= GENHD_FL_REMOVABLE;
2bae0093
TH		 2670 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2671 }
4ace92fc 2672
4ace92fc 2673 add_disk(gd);
fe542396
MP		 2674 if (sdkp->capacity)
2675 sd_dif_config_host(sdkp);
4ace92fc 2676
3821d768
MP		 2677 sd_revalidate_disk(gd);
2678
4ace92fc
AV		 2679 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2680 sdp->removable ? "removable " : "");
478a8a05 2681 scsi_autopm_put_device(sdp);
ea038f63 2682 put_device(&sdkp->dev);
4ace92fc
AV		 2683}
2684
1da177e4
LT		 2685/**
2686 * sd_probe - called during driver initialization and whenever a
2687 * new scsi device is attached to the system. It is called once
2688 * for each scsi device (not just disks) present.
2689 * @dev: pointer to device object
2690 *
2691 * Returns 0 if successful (or not interested in this scsi device
2692 * (e.g. scanner)); 1 when there is an error.
2693 *
2694 * Note: this function is invoked from the scsi mid-level.
2695 * This function sets up the mapping between a given
2696 * <host,channel,id,lun> (found in sdp) and new device name
2697 * (e.g. /dev/sda). More precisely it is the block device major
2698 * and minor number that is chosen here.
2699 *
2db93ce8
PU		 2700 * Assume sd_probe is not re-entrant (for time being)
2701 * Also think about sd_probe() and sd_remove() running coincidentally.
1da177e4
LT		 2702 **/
2703static int sd_probe(struct device *dev)
2704{
2705 struct scsi_device *sdp = to_scsi_device(dev);
2706 struct scsi_disk *sdkp;
2707 struct gendisk *gd;
439d77f7 2708 int index;
1da177e4
LT		 2709 int error;
2710
2711 error = -ENODEV;
631e8a13 2712 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1da177e4
LT		 2713 goto out;
2714
9ccfc756 2715 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2db93ce8 2716 "sd_probe\n"));
1da177e4
LT		 2717
2718 error = -ENOMEM;
24669f75 2719 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1da177e4
LT		 2720 if (!sdkp)
2721 goto out;
2722
689d6fac 2723 gd = alloc_disk(SD_MINORS);
1da177e4
LT		 2724 if (!gd)
2725 goto out_free;
2726
f27bac27
TH		 2727 do {
2728 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2729 goto out_put;
1da177e4 2730
4034cc68 2731 spin_lock(&sd_index_lock);
f27bac27 2732 error = ida_get_new(&sd_index_ida, &index);
4034cc68 2733 spin_unlock(&sd_index_lock);
f27bac27 2734 } while (error == -EAGAIN);
1da177e4 2735
21208ae5
DK		 2736 if (error) {
2737 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
1da177e4 2738 goto out_put;
1a03ae0f
MR		 2739 }
2740
3e1a7ff8 2741 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
21208ae5
DK		 2742 if (error) {
2743 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
f27bac27 2744 goto out_free_index;
21208ae5 2745 }
f27bac27 2746
1da177e4
LT		 2747 sdkp->device = sdp;
2748 sdkp->driver = &sd_template;
2749 sdkp->disk = gd;
2750 sdkp->index = index;
409f3499 2751 atomic_set(&sdkp->openers, 0);
9e1a1537 2752 atomic_set(&sdkp->device->ioerr_cnt, 0);
1da177e4 2753
601e7638
JB		 2754 if (!sdp->request_queue->rq_timeout) {
2755 if (sdp->type != TYPE_MOD)
2756 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2757 else
2758 blk_queue_rq_timeout(sdp->request_queue,
2759 SD_MOD_TIMEOUT);
2760 }
2761
2762 device_initialize(&sdkp->dev);
478a8a05 2763 sdkp->dev.parent = dev;
601e7638 2764 sdkp->dev.class = &sd_disk_class;
478a8a05 2765 dev_set_name(&sdkp->dev, dev_name(dev));
601e7638
JB		 2766
2767 if (device_add(&sdkp->dev))
2768 goto out_free_index;
2769
478a8a05
AS		 2770 get_device(dev);
2771 dev_set_drvdata(dev, sdkp);
601e7638 2772
ea038f63 2773 get_device(&sdkp->dev); /* prevent release before async_schedule */
a7a20d10 2774 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
1da177e4
LT		 2775
2776 return 0;
2777
f27bac27 2778 out_free_index:
4034cc68 2779 spin_lock(&sd_index_lock);
f27bac27 2780 ida_remove(&sd_index_ida, index);
4034cc68 2781 spin_unlock(&sd_index_lock);
6bdaa1f1 2782 out_put:
1da177e4 2783 put_disk(gd);
6bdaa1f1 2784 out_free:
1da177e4 2785 kfree(sdkp);
6bdaa1f1 2786 out:
1da177e4
LT		 2787 return error;
2788}
2789
2790/**
2791 * sd_remove - called whenever a scsi disk (previously recognized by
2792 * sd_probe) is detached from the system. It is called (potentially
2793 * multiple times) during sd module unload.
2794 * @sdp: pointer to mid level scsi device object
2795 *
2796 * Note: this function is invoked from the scsi mid-level.
2797 * This function potentially frees up a device name (e.g. /dev/sdc)
2798 * that could be re-used by a subsequent sd_probe().
2799 * This function is not called when the built-in sd driver is "exit-ed".
2800 **/
2801static int sd_remove(struct device *dev)
2802{
601e7638 2803 struct scsi_disk *sdkp;
1da177e4 2804
601e7638 2805 sdkp = dev_get_drvdata(dev);
478a8a05
AS		 2806 scsi_autopm_get_device(sdkp->device);
2807
a7a20d10 2808 async_synchronize_full_domain(&scsi_sd_probe_domain);
b391277a 2809 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
82b6d57f 2810 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
ee959b00 2811 device_del(&sdkp->dev);
1da177e4
LT		 2812 del_gendisk(sdkp->disk);
2813 sd_shutdown(dev);
39b7f1e2 2814
0b950672 2815 mutex_lock(&sd_ref_mutex);
39b7f1e2 2816 dev_set_drvdata(dev, NULL);
ee959b00 2817 put_device(&sdkp->dev);
0b950672 2818 mutex_unlock(&sd_ref_mutex);
1da177e4
LT		 2819
2820 return 0;
2821}
2822
2823/**
2824 * scsi_disk_release - Called to free the scsi_disk structure
ee959b00 2825 * @dev: pointer to embedded class device
1da177e4 2826 *
0b950672 2827 * sd_ref_mutex must be held entering this routine. Because it is
1da177e4
LT		 2828 * called on last put, you should always use the scsi_disk_get()
2829 * scsi_disk_put() helpers which manipulate the semaphore directly
ee959b00 2830 * and never do a direct put_device.
1da177e4 2831 **/
ee959b00 2832static void scsi_disk_release(struct device *dev)
1da177e4 2833{
ee959b00 2834 struct scsi_disk *sdkp = to_scsi_disk(dev);
1da177e4
LT		 2835 struct gendisk *disk = sdkp->disk;
2836
4034cc68 2837 spin_lock(&sd_index_lock);
f27bac27 2838 ida_remove(&sd_index_ida, sdkp->index);
4034cc68 2839 spin_unlock(&sd_index_lock);
1da177e4
LT		 2840
2841 disk->private_data = NULL;
1da177e4 2842 put_disk(disk);
39b7f1e2 2843 put_device(&sdkp->device->sdev_gendev);
1da177e4
LT		 2844
2845 kfree(sdkp);
2846}
2847
cc5d2c8c 2848static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
c3c94c5a
TH		 2849{
2850 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2851 struct scsi_sense_hdr sshdr;
cc5d2c8c 2852 struct scsi_device *sdp = sdkp->device;
c3c94c5a
TH		 2853 int res;
2854
2855 if (start)
2856 cmd[4] |= 1; /* START */
2857
d2886ea3
SR		 2858 if (sdp->start_stop_pwr_cond)
2859 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2860
c3c94c5a
TH		 2861 if (!scsi_device_online(sdp))
2862 return -ENODEV;
2863
2864 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
f4f4e47e 2865 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
c3c94c5a 2866 if (res) {
cc5d2c8c
JB		 2867 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2868 sd_print_result(sdkp, res);
c3c94c5a 2869 if (driver_byte(res) & DRIVER_SENSE)
cc5d2c8c 2870 sd_print_sense_hdr(sdkp, &sshdr);
c3c94c5a
TH		 2871 }
2872
2873 return res;
2874}
2875
1da177e4
LT		 2876/*
2877 * Send a SYNCHRONIZE CACHE instruction down to the device through
2878 * the normal SCSI command structure. Wait for the command to
2879 * complete.
2880 */
2881static void sd_shutdown(struct device *dev)
2882{
39b7f1e2 2883 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1da177e4
LT		 2884
2885 if (!sdkp)
2886 return; /* this can happen */
2887
54f57588
LM		 2888 if (pm_runtime_suspended(dev))
2889 goto exit;
2890
39b7f1e2 2891 if (sdkp->WCE) {
e73aec82
MP		 2892 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2893 sd_sync_cache(sdkp);
39b7f1e2 2894 }
c3c94c5a 2895
cc5d2c8c
JB		 2896 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2897 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2898 sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2899 }
2900
54f57588 2901exit:
39b7f1e2
AS		 2902 scsi_disk_put(sdkp);
2903}
1da177e4 2904
c3c94c5a
TH		 2905static int sd_suspend(struct device *dev, pm_message_t mesg)
2906{
c3c94c5a 2907 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2908 int ret = 0;
c3c94c5a
TH		 2909
2910 if (!sdkp)
2911 return 0; /* this can happen */
2912
2913 if (sdkp->WCE) {
cc5d2c8c 2914 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
c3c94c5a
TH		 2915 ret = sd_sync_cache(sdkp);
2916 if (ret)
09ff92fe 2917 goto done;
c3c94c5a
TH		 2918 }
2919
3a2d5b70 2920 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
cc5d2c8c
JB		 2921 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2922 ret = sd_start_stop_device(sdkp, 0);
c3c94c5a
TH		 2923 }
2924
09ff92fe
AS		 2925done:
2926 scsi_disk_put(sdkp);
2927 return ret;
c3c94c5a
TH		 2928}
2929
2930static int sd_resume(struct device *dev)
2931{
c3c94c5a 2932 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
09ff92fe 2933 int ret = 0;
c3c94c5a 2934
cc5d2c8c 2935 if (!sdkp->device->manage_start_stop)
09ff92fe 2936 goto done;
c3c94c5a 2937
cc5d2c8c 2938 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
09ff92fe 2939 ret = sd_start_stop_device(sdkp, 1);
c3c94c5a 2940
09ff92fe
AS		 2941done:
2942 scsi_disk_put(sdkp);
2943 return ret;
c3c94c5a
TH		 2944}
2945
1da177e4
LT		 2946/**
2947 * init_sd - entry point for this driver (both when built in or when
2948 * a module).
2949 *
2950 * Note: this function registers this driver with the scsi mid-level.
2951 **/
2952static int __init init_sd(void)
2953{
5e4009ba 2954 int majors = 0, i, err;
1da177e4
LT		 2955
2956 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2957
2958 for (i = 0; i < SD_MAJORS; i++)
2959 if (register_blkdev(sd_major(i), "sd") == 0)
2960 majors++;
2961
2962 if (!majors)
2963 return -ENODEV;
2964
5e4009ba
JG		 2965 err = class_register(&sd_disk_class);
2966 if (err)
2967 goto err_out;
6bdaa1f1 2968
5e4009ba
JG		 2969 err = scsi_register_driver(&sd_template.gendrv);
2970 if (err)
2971 goto err_out_class;
2972
4e7392ec
MP		 2973 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2974 0, 0, NULL);
2975 if (!sd_cdb_cache) {
2976 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2977 goto err_out_class;
2978 }
2979
2980 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2981 if (!sd_cdb_pool) {
2982 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2983 goto err_out_cache;
2984 }
2985
5e4009ba
JG		 2986 return 0;
2987
4e7392ec
MP		 2988err_out_cache:
2989 kmem_cache_destroy(sd_cdb_cache);
2990
5e4009ba
JG		 2991err_out_class:
2992 class_unregister(&sd_disk_class);
2993err_out:
2994 for (i = 0; i < SD_MAJORS; i++)
2995 unregister_blkdev(sd_major(i), "sd");
2996 return err;
1da177e4
LT		 2997}
2998
2999/**
3000 * exit_sd - exit point for this driver (when it is a module).
3001 *
3002 * Note: this function unregisters this driver from the scsi mid-level.
3003 **/
3004static void __exit exit_sd(void)
3005{
3006 int i;
3007
3008 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3009
4e7392ec
MP		 3010 mempool_destroy(sd_cdb_pool);
3011 kmem_cache_destroy(sd_cdb_cache);
3012
1da177e4 3013 scsi_unregister_driver(&sd_template.gendrv);
5e4009ba
JG		 3014 class_unregister(&sd_disk_class);
3015
1da177e4
LT		 3016 for (i = 0; i < SD_MAJORS; i++)
3017 unregister_blkdev(sd_major(i), "sd");
3018}
3019
1da177e4
LT		 3020module_init(init_sd);
3021module_exit(exit_sd);
e73aec82
MP		 3022
3023static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3024 struct scsi_sense_hdr *sshdr)
3025{
2e4c3329 3026 sd_printk(KERN_INFO, sdkp, " ");
e73aec82 3027 scsi_show_sense_hdr(sshdr);
2e4c3329 3028 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3029 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3030}
3031
3032static void sd_print_result(struct scsi_disk *sdkp, int result)
3033{
2e4c3329 3034 sd_printk(KERN_INFO, sdkp, " ");
e73aec82
MP		 3035 scsi_show_result(result);
3036}
3037
kernel source for telekom puls (alcatel/mediatek)