2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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.
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.
35 #include <linux/module.h>
37 #include <linux/kernel.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>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
55 #include <linux/t10-pi.h>
56 #include <asm/uaccess.h>
57 #include <asm/unaligned.h>
59 #include <scsi/scsi.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_dbg.h>
62 #include <scsi/scsi_device.h>
63 #include <scsi/scsi_driver.h>
64 #include <scsi/scsi_eh.h>
65 #include <scsi/scsi_host.h>
66 #include <scsi/scsi_ioctl.h>
67 #include <scsi/scsicam.h>
70 #include "scsi_priv.h"
71 #include "scsi_logging.h"
73 MODULE_AUTHOR("Eric Youngdale");
74 MODULE_DESCRIPTION("SCSI disk (sd) driver");
75 MODULE_LICENSE("GPL");
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
95 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
97 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
103 static void sd_config_discard(struct scsi_disk
*, unsigned int);
104 static void sd_config_write_same(struct scsi_disk
*);
105 static int sd_revalidate_disk(struct gendisk
*);
106 static void sd_unlock_native_capacity(struct gendisk
*disk
);
107 static int sd_probe(struct device
*);
108 static int sd_remove(struct device
*);
109 static void sd_shutdown(struct device
*);
110 static int sd_suspend_system(struct device
*);
111 static int sd_suspend_runtime(struct device
*);
112 static int sd_resume(struct device
*);
113 static void sd_rescan(struct device
*);
114 static int sd_init_command(struct scsi_cmnd
*SCpnt
);
115 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
);
116 static int sd_done(struct scsi_cmnd
*);
117 static int sd_eh_action(struct scsi_cmnd
*, int);
118 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
119 static void scsi_disk_release(struct device
*cdev
);
120 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
121 static void sd_print_result(const struct scsi_disk
*, const char *, int);
123 static DEFINE_SPINLOCK(sd_index_lock
);
124 static DEFINE_IDA(sd_index_ida
);
126 /* This semaphore is used to mediate the 0->1 reference get in the
127 * face of object destruction (i.e. we can't allow a get on an
128 * object after last put) */
129 static DEFINE_MUTEX(sd_ref_mutex
);
131 static struct kmem_cache
*sd_cdb_cache
;
132 static mempool_t
*sd_cdb_pool
;
134 static const char *sd_cache_types
[] = {
135 "write through", "none", "write back",
136 "write back, no read (daft)"
139 static void sd_set_flush_flag(struct scsi_disk
*sdkp
)
141 bool wc
= false, fua
= false;
149 blk_queue_write_cache(sdkp
->disk
->queue
, wc
, fua
);
153 cache_type_store(struct device
*dev
, struct device_attribute
*attr
,
154 const char *buf
, size_t count
)
156 int i
, ct
= -1, rcd
, wce
, sp
;
157 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
158 struct scsi_device
*sdp
= sdkp
->device
;
161 struct scsi_mode_data data
;
162 struct scsi_sense_hdr sshdr
;
163 static const char temp
[] = "temporary ";
166 if (sdp
->type
!= TYPE_DISK
)
167 /* no cache control on RBC devices; theoretically they
168 * can do it, but there's probably so many exceptions
169 * it's not worth the risk */
172 if (strncmp(buf
, temp
, sizeof(temp
) - 1) == 0) {
173 buf
+= sizeof(temp
) - 1;
174 sdkp
->cache_override
= 1;
176 sdkp
->cache_override
= 0;
179 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
180 len
= strlen(sd_cache_types
[i
]);
181 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
189 rcd
= ct
& 0x01 ? 1 : 0;
190 wce
= (ct
& 0x02) && !sdkp
->write_prot
? 1 : 0;
192 if (sdkp
->cache_override
) {
195 sd_set_flush_flag(sdkp
);
199 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
200 SD_MAX_RETRIES
, &data
, NULL
))
202 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
203 data
.block_descriptor_length
);
204 buffer_data
= buffer
+ data
.header_length
+
205 data
.block_descriptor_length
;
206 buffer_data
[2] &= ~0x05;
207 buffer_data
[2] |= wce
<< 2 | rcd
;
208 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
209 buffer_data
[0] &= ~0x80;
211 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
212 SD_MAX_RETRIES
, &data
, &sshdr
)) {
213 if (scsi_sense_valid(&sshdr
))
214 sd_print_sense_hdr(sdkp
, &sshdr
);
217 revalidate_disk(sdkp
->disk
);
222 manage_start_stop_show(struct device
*dev
, struct device_attribute
*attr
,
225 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
226 struct scsi_device
*sdp
= sdkp
->device
;
228 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
232 manage_start_stop_store(struct device
*dev
, struct device_attribute
*attr
,
233 const char *buf
, size_t count
)
235 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
236 struct scsi_device
*sdp
= sdkp
->device
;
238 if (!capable(CAP_SYS_ADMIN
))
241 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
245 static DEVICE_ATTR_RW(manage_start_stop
);
248 allow_restart_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
250 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
252 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
256 allow_restart_store(struct device
*dev
, struct device_attribute
*attr
,
257 const char *buf
, size_t count
)
259 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
260 struct scsi_device
*sdp
= sdkp
->device
;
262 if (!capable(CAP_SYS_ADMIN
))
265 if (sdp
->type
!= TYPE_DISK
)
268 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
272 static DEVICE_ATTR_RW(allow_restart
);
275 cache_type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
277 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
278 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
280 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
282 static DEVICE_ATTR_RW(cache_type
);
285 FUA_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
287 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
289 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
291 static DEVICE_ATTR_RO(FUA
);
294 protection_type_show(struct device
*dev
, struct device_attribute
*attr
,
297 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
299 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
303 protection_type_store(struct device
*dev
, struct device_attribute
*attr
,
304 const char *buf
, size_t count
)
306 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
310 if (!capable(CAP_SYS_ADMIN
))
313 err
= kstrtouint(buf
, 10, &val
);
318 if (val
>= 0 && val
<= T10_PI_TYPE3_PROTECTION
)
319 sdkp
->protection_type
= val
;
323 static DEVICE_ATTR_RW(protection_type
);
326 protection_mode_show(struct device
*dev
, struct device_attribute
*attr
,
329 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
330 struct scsi_device
*sdp
= sdkp
->device
;
331 unsigned int dif
, dix
;
333 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
334 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
336 if (!dix
&& scsi_host_dix_capable(sdp
->host
, T10_PI_TYPE0_PROTECTION
)) {
342 return snprintf(buf
, 20, "none\n");
344 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
346 static DEVICE_ATTR_RO(protection_mode
);
349 app_tag_own_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
351 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
353 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
355 static DEVICE_ATTR_RO(app_tag_own
);
358 thin_provisioning_show(struct device
*dev
, struct device_attribute
*attr
,
361 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
363 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
365 static DEVICE_ATTR_RO(thin_provisioning
);
367 static const char *lbp_mode
[] = {
368 [SD_LBP_FULL
] = "full",
369 [SD_LBP_UNMAP
] = "unmap",
370 [SD_LBP_WS16
] = "writesame_16",
371 [SD_LBP_WS10
] = "writesame_10",
372 [SD_LBP_ZERO
] = "writesame_zero",
373 [SD_LBP_DISABLE
] = "disabled",
377 provisioning_mode_show(struct device
*dev
, struct device_attribute
*attr
,
380 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
382 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
386 provisioning_mode_store(struct device
*dev
, struct device_attribute
*attr
,
387 const char *buf
, size_t count
)
389 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
390 struct scsi_device
*sdp
= sdkp
->device
;
392 if (!capable(CAP_SYS_ADMIN
))
395 if (sdp
->type
!= TYPE_DISK
)
398 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
399 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
400 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
401 sd_config_discard(sdkp
, SD_LBP_WS16
);
402 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
403 sd_config_discard(sdkp
, SD_LBP_WS10
);
404 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
405 sd_config_discard(sdkp
, SD_LBP_ZERO
);
406 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
407 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
413 static DEVICE_ATTR_RW(provisioning_mode
);
416 max_medium_access_timeouts_show(struct device
*dev
,
417 struct device_attribute
*attr
, char *buf
)
419 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
421 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
425 max_medium_access_timeouts_store(struct device
*dev
,
426 struct device_attribute
*attr
, const char *buf
,
429 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
432 if (!capable(CAP_SYS_ADMIN
))
435 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
437 return err
? err
: count
;
439 static DEVICE_ATTR_RW(max_medium_access_timeouts
);
442 max_write_same_blocks_show(struct device
*dev
, struct device_attribute
*attr
,
445 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
447 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
451 max_write_same_blocks_store(struct device
*dev
, struct device_attribute
*attr
,
452 const char *buf
, size_t count
)
454 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
455 struct scsi_device
*sdp
= sdkp
->device
;
459 if (!capable(CAP_SYS_ADMIN
))
462 if (sdp
->type
!= TYPE_DISK
)
465 err
= kstrtoul(buf
, 10, &max
);
471 sdp
->no_write_same
= 1;
472 else if (max
<= SD_MAX_WS16_BLOCKS
) {
473 sdp
->no_write_same
= 0;
474 sdkp
->max_ws_blocks
= max
;
477 sd_config_write_same(sdkp
);
481 static DEVICE_ATTR_RW(max_write_same_blocks
);
483 static struct attribute
*sd_disk_attrs
[] = {
484 &dev_attr_cache_type
.attr
,
486 &dev_attr_allow_restart
.attr
,
487 &dev_attr_manage_start_stop
.attr
,
488 &dev_attr_protection_type
.attr
,
489 &dev_attr_protection_mode
.attr
,
490 &dev_attr_app_tag_own
.attr
,
491 &dev_attr_thin_provisioning
.attr
,
492 &dev_attr_provisioning_mode
.attr
,
493 &dev_attr_max_write_same_blocks
.attr
,
494 &dev_attr_max_medium_access_timeouts
.attr
,
497 ATTRIBUTE_GROUPS(sd_disk
);
499 static struct class sd_disk_class
= {
501 .owner
= THIS_MODULE
,
502 .dev_release
= scsi_disk_release
,
503 .dev_groups
= sd_disk_groups
,
506 static const struct dev_pm_ops sd_pm_ops
= {
507 .suspend
= sd_suspend_system
,
509 .poweroff
= sd_suspend_system
,
510 .restore
= sd_resume
,
511 .runtime_suspend
= sd_suspend_runtime
,
512 .runtime_resume
= sd_resume
,
515 static struct scsi_driver sd_template
= {
518 .owner
= THIS_MODULE
,
521 .shutdown
= sd_shutdown
,
525 .init_command
= sd_init_command
,
526 .uninit_command
= sd_uninit_command
,
528 .eh_action
= sd_eh_action
,
532 * Dummy kobj_map->probe function.
533 * The default ->probe function will call modprobe, which is
534 * pointless as this module is already loaded.
536 static struct kobject
*sd_default_probe(dev_t devt
, int *partno
, void *data
)
542 * Device no to disk mapping:
544 * major disc2 disc p1
545 * |............|.............|....|....| <- dev_t
548 * Inside a major, we have 16k disks, however mapped non-
549 * contiguously. The first 16 disks are for major0, the next
550 * ones with major1, ... Disk 256 is for major0 again, disk 272
552 * As we stay compatible with our numbering scheme, we can reuse
553 * the well-know SCSI majors 8, 65--71, 136--143.
555 static int sd_major(int major_idx
)
559 return SCSI_DISK0_MAJOR
;
561 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
563 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
566 return 0; /* shut up gcc */
570 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
572 struct scsi_disk
*sdkp
= NULL
;
574 mutex_lock(&sd_ref_mutex
);
576 if (disk
->private_data
) {
577 sdkp
= scsi_disk(disk
);
578 if (scsi_device_get(sdkp
->device
) == 0)
579 get_device(&sdkp
->dev
);
583 mutex_unlock(&sd_ref_mutex
);
587 static void scsi_disk_put(struct scsi_disk
*sdkp
)
589 struct scsi_device
*sdev
= sdkp
->device
;
591 mutex_lock(&sd_ref_mutex
);
592 put_device(&sdkp
->dev
);
593 scsi_device_put(sdev
);
594 mutex_unlock(&sd_ref_mutex
);
597 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd
*scmd
,
598 unsigned int dix
, unsigned int dif
)
600 struct bio
*bio
= scmd
->request
->bio
;
601 unsigned int prot_op
= sd_prot_op(rq_data_dir(scmd
->request
), dix
, dif
);
602 unsigned int protect
= 0;
604 if (dix
) { /* DIX Type 0, 1, 2, 3 */
605 if (bio_integrity_flagged(bio
, BIP_IP_CHECKSUM
))
606 scmd
->prot_flags
|= SCSI_PROT_IP_CHECKSUM
;
608 if (bio_integrity_flagged(bio
, BIP_CTRL_NOCHECK
) == false)
609 scmd
->prot_flags
|= SCSI_PROT_GUARD_CHECK
;
612 if (dif
!= T10_PI_TYPE3_PROTECTION
) { /* DIX/DIF Type 0, 1, 2 */
613 scmd
->prot_flags
|= SCSI_PROT_REF_INCREMENT
;
615 if (bio_integrity_flagged(bio
, BIP_CTRL_NOCHECK
) == false)
616 scmd
->prot_flags
|= SCSI_PROT_REF_CHECK
;
619 if (dif
) { /* DIX/DIF Type 1, 2, 3 */
620 scmd
->prot_flags
|= SCSI_PROT_TRANSFER_PI
;
622 if (bio_integrity_flagged(bio
, BIP_DISK_NOCHECK
))
623 protect
= 3 << 5; /* Disable target PI checking */
625 protect
= 1 << 5; /* Enable target PI checking */
628 scsi_set_prot_op(scmd
, prot_op
);
629 scsi_set_prot_type(scmd
, dif
);
630 scmd
->prot_flags
&= sd_prot_flag_mask(prot_op
);
635 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
637 struct request_queue
*q
= sdkp
->disk
->queue
;
638 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
639 unsigned int max_blocks
= 0;
641 q
->limits
.discard_zeroes_data
= 0;
644 * When LBPRZ is reported, discard alignment and granularity
645 * must be fixed to the logical block size. Otherwise the block
646 * layer will drop misaligned portions of the request which can
647 * lead to data corruption. If LBPRZ is not set, we honor the
651 q
->limits
.discard_alignment
= 0;
652 q
->limits
.discard_granularity
= logical_block_size
;
654 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
656 q
->limits
.discard_granularity
=
657 max(sdkp
->physical_block_size
,
658 sdkp
->unmap_granularity
* logical_block_size
);
661 sdkp
->provisioning_mode
= mode
;
666 blk_queue_max_discard_sectors(q
, 0);
667 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
671 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
672 (u32
)SD_MAX_WS16_BLOCKS
);
676 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
677 (u32
)SD_MAX_WS16_BLOCKS
);
678 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
682 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
683 (u32
)SD_MAX_WS10_BLOCKS
);
684 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
688 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
689 (u32
)SD_MAX_WS10_BLOCKS
);
690 q
->limits
.discard_zeroes_data
= 1;
694 blk_queue_max_discard_sectors(q
, max_blocks
* (logical_block_size
>> 9));
695 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
699 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
700 * @sdp: scsi device to operate one
701 * @rq: Request to prepare
703 * Will issue either UNMAP or WRITE SAME(16) depending on preference
704 * indicated by target device.
706 static int sd_setup_discard_cmnd(struct scsi_cmnd
*cmd
)
708 struct request
*rq
= cmd
->request
;
709 struct scsi_device
*sdp
= cmd
->device
;
710 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
711 sector_t sector
= blk_rq_pos(rq
);
712 unsigned int nr_sectors
= blk_rq_sectors(rq
);
713 unsigned int nr_bytes
= blk_rq_bytes(rq
);
719 sector
>>= ilog2(sdp
->sector_size
) - 9;
720 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
722 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
724 return BLKPREP_DEFER
;
726 switch (sdkp
->provisioning_mode
) {
728 buf
= page_address(page
);
731 cmd
->cmnd
[0] = UNMAP
;
734 put_unaligned_be16(6 + 16, &buf
[0]);
735 put_unaligned_be16(16, &buf
[2]);
736 put_unaligned_be64(sector
, &buf
[8]);
737 put_unaligned_be32(nr_sectors
, &buf
[16]);
744 cmd
->cmnd
[0] = WRITE_SAME_16
;
745 cmd
->cmnd
[1] = 0x8; /* UNMAP */
746 put_unaligned_be64(sector
, &cmd
->cmnd
[2]);
747 put_unaligned_be32(nr_sectors
, &cmd
->cmnd
[10]);
749 len
= sdkp
->device
->sector_size
;
755 cmd
->cmnd
[0] = WRITE_SAME
;
756 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
757 cmd
->cmnd
[1] = 0x8; /* UNMAP */
758 put_unaligned_be32(sector
, &cmd
->cmnd
[2]);
759 put_unaligned_be16(nr_sectors
, &cmd
->cmnd
[7]);
761 len
= sdkp
->device
->sector_size
;
765 ret
= BLKPREP_INVALID
;
769 rq
->completion_data
= page
;
770 rq
->timeout
= SD_TIMEOUT
;
772 cmd
->transfersize
= len
;
773 cmd
->allowed
= SD_MAX_RETRIES
;
776 * Initially __data_len is set to the amount of data that needs to be
777 * transferred to the target. This amount depends on whether WRITE SAME
778 * or UNMAP is being used. After the scatterlist has been mapped by
779 * scsi_init_io() we set __data_len to the size of the area to be
780 * discarded on disk. This allows us to report completion on the full
781 * amount of blocks described by the request.
783 blk_add_request_payload(rq
, page
, 0, len
);
784 ret
= scsi_init_io(cmd
);
785 rq
->__data_len
= nr_bytes
;
788 if (ret
!= BLKPREP_OK
)
793 static void sd_config_write_same(struct scsi_disk
*sdkp
)
795 struct request_queue
*q
= sdkp
->disk
->queue
;
796 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
798 if (sdkp
->device
->no_write_same
) {
799 sdkp
->max_ws_blocks
= 0;
803 /* Some devices can not handle block counts above 0xffff despite
804 * supporting WRITE SAME(16). Consequently we default to 64k
805 * blocks per I/O unless the device explicitly advertises a
808 if (sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
809 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
810 (u32
)SD_MAX_WS16_BLOCKS
);
811 else if (sdkp
->ws16
|| sdkp
->ws10
|| sdkp
->device
->no_report_opcodes
)
812 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
813 (u32
)SD_MAX_WS10_BLOCKS
);
815 sdkp
->device
->no_write_same
= 1;
816 sdkp
->max_ws_blocks
= 0;
820 blk_queue_max_write_same_sectors(q
, sdkp
->max_ws_blocks
*
821 (logical_block_size
>> 9));
825 * sd_setup_write_same_cmnd - write the same data to multiple blocks
826 * @cmd: command to prepare
828 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
829 * preference indicated by target device.
831 static int sd_setup_write_same_cmnd(struct scsi_cmnd
*cmd
)
833 struct request
*rq
= cmd
->request
;
834 struct scsi_device
*sdp
= cmd
->device
;
835 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
836 struct bio
*bio
= rq
->bio
;
837 sector_t sector
= blk_rq_pos(rq
);
838 unsigned int nr_sectors
= blk_rq_sectors(rq
);
839 unsigned int nr_bytes
= blk_rq_bytes(rq
);
842 if (sdkp
->device
->no_write_same
)
843 return BLKPREP_INVALID
;
845 BUG_ON(bio_offset(bio
) || bio_iovec(bio
).bv_len
!= sdp
->sector_size
);
847 sector
>>= ilog2(sdp
->sector_size
) - 9;
848 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
850 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
852 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
854 cmd
->cmnd
[0] = WRITE_SAME_16
;
855 put_unaligned_be64(sector
, &cmd
->cmnd
[2]);
856 put_unaligned_be32(nr_sectors
, &cmd
->cmnd
[10]);
859 cmd
->cmnd
[0] = WRITE_SAME
;
860 put_unaligned_be32(sector
, &cmd
->cmnd
[2]);
861 put_unaligned_be16(nr_sectors
, &cmd
->cmnd
[7]);
864 cmd
->transfersize
= sdp
->sector_size
;
865 cmd
->allowed
= SD_MAX_RETRIES
;
868 * For WRITE_SAME the data transferred in the DATA IN buffer is
869 * different from the amount of data actually written to the target.
871 * We set up __data_len to the amount of data transferred from the
872 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
873 * to transfer a single sector of data first, but then reset it to
874 * the amount of data to be written right after so that the I/O path
875 * knows how much to actually write.
877 rq
->__data_len
= sdp
->sector_size
;
878 ret
= scsi_init_io(cmd
);
879 rq
->__data_len
= nr_bytes
;
883 static int sd_setup_flush_cmnd(struct scsi_cmnd
*cmd
)
885 struct request
*rq
= cmd
->request
;
887 /* flush requests don't perform I/O, zero the S/G table */
888 memset(&cmd
->sdb
, 0, sizeof(cmd
->sdb
));
890 cmd
->cmnd
[0] = SYNCHRONIZE_CACHE
;
892 cmd
->transfersize
= 0;
893 cmd
->allowed
= SD_MAX_RETRIES
;
895 rq
->timeout
= rq
->q
->rq_timeout
* SD_FLUSH_TIMEOUT_MULTIPLIER
;
899 static int sd_setup_read_write_cmnd(struct scsi_cmnd
*SCpnt
)
901 struct request
*rq
= SCpnt
->request
;
902 struct scsi_device
*sdp
= SCpnt
->device
;
903 struct gendisk
*disk
= rq
->rq_disk
;
904 struct scsi_disk
*sdkp
;
905 sector_t block
= blk_rq_pos(rq
);
907 unsigned int this_count
= blk_rq_sectors(rq
);
908 unsigned int dif
, dix
;
910 unsigned char protect
;
912 ret
= scsi_init_io(SCpnt
);
913 if (ret
!= BLKPREP_OK
)
916 sdkp
= scsi_disk(disk
);
918 /* from here on until we're complete, any goto out
919 * is used for a killable error condition */
923 scmd_printk(KERN_INFO
, SCpnt
,
924 "%s: block=%llu, count=%d\n",
925 __func__
, (unsigned long long)block
, this_count
));
927 if (!sdp
|| !scsi_device_online(sdp
) ||
928 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
929 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
930 "Finishing %u sectors\n",
931 blk_rq_sectors(rq
)));
932 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
933 "Retry with 0x%p\n", SCpnt
));
939 * quietly refuse to do anything to a changed disc until
940 * the changed bit has been reset
942 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
947 * Some SD card readers can't handle multi-sector accesses which touch
948 * the last one or two hardware sectors. Split accesses as needed.
950 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
951 (sdp
->sector_size
/ 512);
953 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
954 if (block
< threshold
) {
955 /* Access up to the threshold but not beyond */
956 this_count
= threshold
- block
;
958 /* Access only a single hardware sector */
959 this_count
= sdp
->sector_size
/ 512;
963 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
964 (unsigned long long)block
));
967 * If we have a 1K hardware sectorsize, prevent access to single
968 * 512 byte sectors. In theory we could handle this - in fact
969 * the scsi cdrom driver must be able to handle this because
970 * we typically use 1K blocksizes, and cdroms typically have
971 * 2K hardware sectorsizes. Of course, things are simpler
972 * with the cdrom, since it is read-only. For performance
973 * reasons, the filesystems should be able to handle this
974 * and not force the scsi disk driver to use bounce buffers
977 if (sdp
->sector_size
== 1024) {
978 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
979 scmd_printk(KERN_ERR
, SCpnt
,
980 "Bad block number requested\n");
984 this_count
= this_count
>> 1;
987 if (sdp
->sector_size
== 2048) {
988 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
989 scmd_printk(KERN_ERR
, SCpnt
,
990 "Bad block number requested\n");
994 this_count
= this_count
>> 2;
997 if (sdp
->sector_size
== 4096) {
998 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
999 scmd_printk(KERN_ERR
, SCpnt
,
1000 "Bad block number requested\n");
1004 this_count
= this_count
>> 3;
1007 if (rq_data_dir(rq
) == WRITE
) {
1008 SCpnt
->cmnd
[0] = WRITE_6
;
1010 if (blk_integrity_rq(rq
))
1011 sd_dif_prepare(SCpnt
);
1013 } else if (rq_data_dir(rq
) == READ
) {
1014 SCpnt
->cmnd
[0] = READ_6
;
1016 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %llu,%llx\n",
1017 req_op(rq
), (unsigned long long) rq
->cmd_flags
);
1021 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
1022 "%s %d/%u 512 byte blocks.\n",
1023 (rq_data_dir(rq
) == WRITE
) ?
1024 "writing" : "reading", this_count
,
1025 blk_rq_sectors(rq
)));
1027 dix
= scsi_prot_sg_count(SCpnt
);
1028 dif
= scsi_host_dif_capable(SCpnt
->device
->host
, sdkp
->protection_type
);
1031 protect
= sd_setup_protect_cmnd(SCpnt
, dix
, dif
);
1035 if (protect
&& sdkp
->protection_type
== T10_PI_TYPE2_PROTECTION
) {
1036 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1038 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1039 ret
= BLKPREP_DEFER
;
1043 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1044 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1045 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1046 SCpnt
->cmnd
[7] = 0x18;
1047 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1048 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1051 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1052 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1053 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1054 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1055 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1056 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1057 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1058 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1060 /* Expected Indirect LBA */
1061 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1062 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1063 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1064 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1066 /* Transfer length */
1067 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1068 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1069 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1070 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1071 } else if (sdp
->use_16_for_rw
|| (this_count
> 0xffff)) {
1072 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1073 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1074 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1075 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1076 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1077 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1078 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1079 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1080 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1081 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1082 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1083 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1084 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1085 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1086 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1087 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1088 scsi_device_protection(SCpnt
->device
) ||
1089 SCpnt
->device
->use_10_for_rw
) {
1090 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1091 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1092 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1093 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1094 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1095 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1096 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1097 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1098 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1100 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1102 * This happens only if this drive failed
1103 * 10byte rw command with ILLEGAL_REQUEST
1104 * during operation and thus turned off
1107 scmd_printk(KERN_ERR
, SCpnt
,
1108 "FUA write on READ/WRITE(6) drive\n");
1112 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1113 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1114 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1115 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1118 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1121 * We shouldn't disconnect in the middle of a sector, so with a dumb
1122 * host adapter, it's safe to assume that we can at least transfer
1123 * this many bytes between each connect / disconnect.
1125 SCpnt
->transfersize
= sdp
->sector_size
;
1126 SCpnt
->underflow
= this_count
<< 9;
1127 SCpnt
->allowed
= SD_MAX_RETRIES
;
1130 * This indicates that the command is ready from our end to be
1138 static int sd_init_command(struct scsi_cmnd
*cmd
)
1140 struct request
*rq
= cmd
->request
;
1142 switch (req_op(rq
)) {
1143 case REQ_OP_DISCARD
:
1144 return sd_setup_discard_cmnd(cmd
);
1145 case REQ_OP_WRITE_SAME
:
1146 return sd_setup_write_same_cmnd(cmd
);
1148 return sd_setup_flush_cmnd(cmd
);
1151 return sd_setup_read_write_cmnd(cmd
);
1157 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
)
1159 struct request
*rq
= SCpnt
->request
;
1161 if (req_op(rq
) == REQ_OP_DISCARD
)
1162 __free_page(rq
->completion_data
);
1164 if (SCpnt
->cmnd
!= rq
->cmd
) {
1165 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1172 * sd_open - open a scsi disk device
1173 * @inode: only i_rdev member may be used
1174 * @filp: only f_mode and f_flags may be used
1176 * Returns 0 if successful. Returns a negated errno value in case
1179 * Note: This can be called from a user context (e.g. fsck(1) )
1180 * or from within the kernel (e.g. as a result of a mount(1) ).
1181 * In the latter case @inode and @filp carry an abridged amount
1182 * of information as noted above.
1184 * Locking: called with bdev->bd_mutex held.
1186 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1188 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1189 struct scsi_device
*sdev
;
1195 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1197 sdev
= sdkp
->device
;
1200 * If the device is in error recovery, wait until it is done.
1201 * If the device is offline, then disallow any access to it.
1204 if (!scsi_block_when_processing_errors(sdev
))
1207 if (sdev
->removable
|| sdkp
->write_prot
)
1208 check_disk_change(bdev
);
1211 * If the drive is empty, just let the open fail.
1213 retval
= -ENOMEDIUM
;
1214 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1218 * If the device has the write protect tab set, have the open fail
1219 * if the user expects to be able to write to the thing.
1222 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1226 * It is possible that the disk changing stuff resulted in
1227 * the device being taken offline. If this is the case,
1228 * report this to the user, and don't pretend that the
1229 * open actually succeeded.
1232 if (!scsi_device_online(sdev
))
1235 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1236 if (scsi_block_when_processing_errors(sdev
))
1237 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1243 scsi_disk_put(sdkp
);
1248 * sd_release - invoked when the (last) close(2) is called on this
1250 * @inode: only i_rdev member may be used
1251 * @filp: only f_mode and f_flags may be used
1255 * Note: may block (uninterruptible) if error recovery is underway
1258 * Locking: called with bdev->bd_mutex held.
1260 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1262 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1263 struct scsi_device
*sdev
= sdkp
->device
;
1265 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1267 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1268 if (scsi_block_when_processing_errors(sdev
))
1269 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1273 * XXX and what if there are packets in flight and this close()
1274 * XXX is followed by a "rmmod sd_mod"?
1277 scsi_disk_put(sdkp
);
1280 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1282 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1283 struct scsi_device
*sdp
= sdkp
->device
;
1284 struct Scsi_Host
*host
= sdp
->host
;
1285 sector_t capacity
= logical_to_sectors(sdp
, sdkp
->capacity
);
1288 /* default to most commonly used values */
1289 diskinfo
[0] = 0x40; /* 1 << 6 */
1290 diskinfo
[1] = 0x20; /* 1 << 5 */
1291 diskinfo
[2] = capacity
>> 11;
1293 /* override with calculated, extended default, or driver values */
1294 if (host
->hostt
->bios_param
)
1295 host
->hostt
->bios_param(sdp
, bdev
, capacity
, diskinfo
);
1297 scsicam_bios_param(bdev
, capacity
, diskinfo
);
1299 geo
->heads
= diskinfo
[0];
1300 geo
->sectors
= diskinfo
[1];
1301 geo
->cylinders
= diskinfo
[2];
1306 * sd_ioctl - process an ioctl
1307 * @inode: only i_rdev/i_bdev members may be used
1308 * @filp: only f_mode and f_flags may be used
1309 * @cmd: ioctl command number
1310 * @arg: this is third argument given to ioctl(2) system call.
1311 * Often contains a pointer.
1313 * Returns 0 if successful (some ioctls return positive numbers on
1314 * success as well). Returns a negated errno value in case of error.
1316 * Note: most ioctls are forward onto the block subsystem or further
1317 * down in the scsi subsystem.
1319 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1320 unsigned int cmd
, unsigned long arg
)
1322 struct gendisk
*disk
= bdev
->bd_disk
;
1323 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1324 struct scsi_device
*sdp
= sdkp
->device
;
1325 void __user
*p
= (void __user
*)arg
;
1328 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1329 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1331 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1336 * If we are in the middle of error recovery, don't let anyone
1337 * else try and use this device. Also, if error recovery fails, it
1338 * may try and take the device offline, in which case all further
1339 * access to the device is prohibited.
1341 error
= scsi_ioctl_block_when_processing_errors(sdp
, cmd
,
1342 (mode
& FMODE_NDELAY
) != 0);
1347 * Send SCSI addressing ioctls directly to mid level, send other
1348 * ioctls to block level and then onto mid level if they can't be
1352 case SCSI_IOCTL_GET_IDLUN
:
1353 case SCSI_IOCTL_GET_BUS_NUMBER
:
1354 error
= scsi_ioctl(sdp
, cmd
, p
);
1357 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1358 if (error
!= -ENOTTY
)
1360 error
= scsi_ioctl(sdp
, cmd
, p
);
1367 static void set_media_not_present(struct scsi_disk
*sdkp
)
1369 if (sdkp
->media_present
)
1370 sdkp
->device
->changed
= 1;
1372 if (sdkp
->device
->removable
) {
1373 sdkp
->media_present
= 0;
1378 static int media_not_present(struct scsi_disk
*sdkp
,
1379 struct scsi_sense_hdr
*sshdr
)
1381 if (!scsi_sense_valid(sshdr
))
1384 /* not invoked for commands that could return deferred errors */
1385 switch (sshdr
->sense_key
) {
1386 case UNIT_ATTENTION
:
1388 /* medium not present */
1389 if (sshdr
->asc
== 0x3A) {
1390 set_media_not_present(sdkp
);
1398 * sd_check_events - check media events
1399 * @disk: kernel device descriptor
1400 * @clearing: disk events currently being cleared
1402 * Returns mask of DISK_EVENT_*.
1404 * Note: this function is invoked from the block subsystem.
1406 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1408 struct scsi_disk
*sdkp
= scsi_disk_get(disk
);
1409 struct scsi_device
*sdp
;
1410 struct scsi_sense_hdr
*sshdr
= NULL
;
1417 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1420 * If the device is offline, don't send any commands - just pretend as
1421 * if the command failed. If the device ever comes back online, we
1422 * can deal with it then. It is only because of unrecoverable errors
1423 * that we would ever take a device offline in the first place.
1425 if (!scsi_device_online(sdp
)) {
1426 set_media_not_present(sdkp
);
1431 * Using TEST_UNIT_READY enables differentiation between drive with
1432 * no cartridge loaded - NOT READY, drive with changed cartridge -
1433 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1435 * Drives that auto spin down. eg iomega jaz 1G, will be started
1436 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1437 * sd_revalidate() is called.
1441 if (scsi_block_when_processing_errors(sdp
)) {
1442 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1443 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1447 /* failed to execute TUR, assume media not present */
1448 if (host_byte(retval
)) {
1449 set_media_not_present(sdkp
);
1453 if (media_not_present(sdkp
, sshdr
))
1457 * For removable scsi disk we have to recognise the presence
1458 * of a disk in the drive.
1460 if (!sdkp
->media_present
)
1462 sdkp
->media_present
= 1;
1465 * sdp->changed is set under the following conditions:
1467 * Medium present state has changed in either direction.
1468 * Device has indicated UNIT_ATTENTION.
1471 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1473 scsi_disk_put(sdkp
);
1477 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1480 struct scsi_device
*sdp
= sdkp
->device
;
1481 const int timeout
= sdp
->request_queue
->rq_timeout
1482 * SD_FLUSH_TIMEOUT_MULTIPLIER
;
1483 struct scsi_sense_hdr sshdr
;
1485 if (!scsi_device_online(sdp
))
1488 for (retries
= 3; retries
> 0; --retries
) {
1489 unsigned char cmd
[10] = { 0 };
1491 cmd
[0] = SYNCHRONIZE_CACHE
;
1493 * Leave the rest of the command zero to indicate
1496 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1497 &sshdr
, timeout
, SD_MAX_RETRIES
,
1504 sd_print_result(sdkp
, "Synchronize Cache(10) failed", res
);
1506 if (driver_byte(res
) & DRIVER_SENSE
)
1507 sd_print_sense_hdr(sdkp
, &sshdr
);
1508 /* we need to evaluate the error return */
1509 if (scsi_sense_valid(&sshdr
) &&
1510 (sshdr
.asc
== 0x3a || /* medium not present */
1511 sshdr
.asc
== 0x20)) /* invalid command */
1512 /* this is no error here */
1515 switch (host_byte(res
)) {
1516 /* ignore errors due to racing a disconnection */
1517 case DID_BAD_TARGET
:
1518 case DID_NO_CONNECT
:
1520 /* signal the upper layer it might try again */
1524 case DID_SOFT_ERROR
:
1533 static void sd_rescan(struct device
*dev
)
1535 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1537 revalidate_disk(sdkp
->disk
);
1541 #ifdef CONFIG_COMPAT
1543 * This gets directly called from VFS. When the ioctl
1544 * is not recognized we go back to the other translation paths.
1546 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1547 unsigned int cmd
, unsigned long arg
)
1549 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1552 error
= scsi_ioctl_block_when_processing_errors(sdev
, cmd
,
1553 (mode
& FMODE_NDELAY
) != 0);
1558 * Let the static ioctl translation table take care of it.
1560 if (!sdev
->host
->hostt
->compat_ioctl
)
1561 return -ENOIOCTLCMD
;
1562 return sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1566 static char sd_pr_type(enum pr_type type
)
1569 case PR_WRITE_EXCLUSIVE
:
1571 case PR_EXCLUSIVE_ACCESS
:
1573 case PR_WRITE_EXCLUSIVE_REG_ONLY
:
1575 case PR_EXCLUSIVE_ACCESS_REG_ONLY
:
1577 case PR_WRITE_EXCLUSIVE_ALL_REGS
:
1579 case PR_EXCLUSIVE_ACCESS_ALL_REGS
:
1586 static int sd_pr_command(struct block_device
*bdev
, u8 sa
,
1587 u64 key
, u64 sa_key
, u8 type
, u8 flags
)
1589 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1590 struct scsi_sense_hdr sshdr
;
1592 u8 cmd
[16] = { 0, };
1593 u8 data
[24] = { 0, };
1595 cmd
[0] = PERSISTENT_RESERVE_OUT
;
1598 put_unaligned_be32(sizeof(data
), &cmd
[5]);
1600 put_unaligned_be64(key
, &data
[0]);
1601 put_unaligned_be64(sa_key
, &data
[8]);
1604 result
= scsi_execute_req(sdev
, cmd
, DMA_TO_DEVICE
, &data
, sizeof(data
),
1605 &sshdr
, SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1607 if ((driver_byte(result
) & DRIVER_SENSE
) &&
1608 (scsi_sense_valid(&sshdr
))) {
1609 sdev_printk(KERN_INFO
, sdev
, "PR command failed: %d\n", result
);
1610 scsi_print_sense_hdr(sdev
, NULL
, &sshdr
);
1616 static int sd_pr_register(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1619 if (flags
& ~PR_FL_IGNORE_KEY
)
1621 return sd_pr_command(bdev
, (flags
& PR_FL_IGNORE_KEY
) ? 0x06 : 0x00,
1622 old_key
, new_key
, 0,
1623 (1 << 0) /* APTPL */);
1626 static int sd_pr_reserve(struct block_device
*bdev
, u64 key
, enum pr_type type
,
1631 return sd_pr_command(bdev
, 0x01, key
, 0, sd_pr_type(type
), 0);
1634 static int sd_pr_release(struct block_device
*bdev
, u64 key
, enum pr_type type
)
1636 return sd_pr_command(bdev
, 0x02, key
, 0, sd_pr_type(type
), 0);
1639 static int sd_pr_preempt(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1640 enum pr_type type
, bool abort
)
1642 return sd_pr_command(bdev
, abort
? 0x05 : 0x04, old_key
, new_key
,
1643 sd_pr_type(type
), 0);
1646 static int sd_pr_clear(struct block_device
*bdev
, u64 key
)
1648 return sd_pr_command(bdev
, 0x03, key
, 0, 0, 0);
1651 static const struct pr_ops sd_pr_ops
= {
1652 .pr_register
= sd_pr_register
,
1653 .pr_reserve
= sd_pr_reserve
,
1654 .pr_release
= sd_pr_release
,
1655 .pr_preempt
= sd_pr_preempt
,
1656 .pr_clear
= sd_pr_clear
,
1659 static const struct block_device_operations sd_fops
= {
1660 .owner
= THIS_MODULE
,
1662 .release
= sd_release
,
1664 .getgeo
= sd_getgeo
,
1665 #ifdef CONFIG_COMPAT
1666 .compat_ioctl
= sd_compat_ioctl
,
1668 .check_events
= sd_check_events
,
1669 .revalidate_disk
= sd_revalidate_disk
,
1670 .unlock_native_capacity
= sd_unlock_native_capacity
,
1671 .pr_ops
= &sd_pr_ops
,
1675 * sd_eh_action - error handling callback
1676 * @scmd: sd-issued command that has failed
1677 * @eh_disp: The recovery disposition suggested by the midlayer
1679 * This function is called by the SCSI midlayer upon completion of an
1680 * error test command (currently TEST UNIT READY). The result of sending
1681 * the eh command is passed in eh_disp. We're looking for devices that
1682 * fail medium access commands but are OK with non access commands like
1683 * test unit ready (so wrongly see the device as having a successful
1686 static int sd_eh_action(struct scsi_cmnd
*scmd
, int eh_disp
)
1688 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1690 if (!scsi_device_online(scmd
->device
) ||
1691 !scsi_medium_access_command(scmd
) ||
1692 host_byte(scmd
->result
) != DID_TIME_OUT
||
1697 * The device has timed out executing a medium access command.
1698 * However, the TEST UNIT READY command sent during error
1699 * handling completed successfully. Either the device is in the
1700 * process of recovering or has it suffered an internal failure
1701 * that prevents access to the storage medium.
1703 sdkp
->medium_access_timed_out
++;
1706 * If the device keeps failing read/write commands but TEST UNIT
1707 * READY always completes successfully we assume that medium
1708 * access is no longer possible and take the device offline.
1710 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1711 scmd_printk(KERN_ERR
, scmd
,
1712 "Medium access timeout failure. Offlining disk!\n");
1713 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1721 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1723 u64 start_lba
= blk_rq_pos(scmd
->request
);
1724 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1725 u64 factor
= scmd
->device
->sector_size
/ 512;
1729 * resid is optional but mostly filled in. When it's unused,
1730 * its value is zero, so we assume the whole buffer transferred
1732 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1733 unsigned int good_bytes
;
1735 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1738 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1739 SCSI_SENSE_BUFFERSIZE
,
1744 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1747 /* be careful ... don't want any overflows */
1748 do_div(start_lba
, factor
);
1749 do_div(end_lba
, factor
);
1751 /* The bad lba was reported incorrectly, we have no idea where
1754 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1757 /* This computation should always be done in terms of
1758 * the resolution of the device's medium.
1760 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1761 return min(good_bytes
, transferred
);
1765 * sd_done - bottom half handler: called when the lower level
1766 * driver has completed (successfully or otherwise) a scsi command.
1767 * @SCpnt: mid-level's per command structure.
1769 * Note: potentially run from within an ISR. Must not block.
1771 static int sd_done(struct scsi_cmnd
*SCpnt
)
1773 int result
= SCpnt
->result
;
1774 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1775 struct scsi_sense_hdr sshdr
;
1776 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1777 struct request
*req
= SCpnt
->request
;
1778 int sense_valid
= 0;
1779 int sense_deferred
= 0;
1780 unsigned char op
= SCpnt
->cmnd
[0];
1781 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1783 if (req_op(req
) == REQ_OP_DISCARD
|| req_op(req
) == REQ_OP_WRITE_SAME
) {
1785 good_bytes
= blk_rq_bytes(req
);
1786 scsi_set_resid(SCpnt
, 0);
1789 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1794 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1796 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1798 sdkp
->medium_access_timed_out
= 0;
1800 if (driver_byte(result
) != DRIVER_SENSE
&&
1801 (!sense_valid
|| sense_deferred
))
1804 switch (sshdr
.sense_key
) {
1805 case HARDWARE_ERROR
:
1807 good_bytes
= sd_completed_bytes(SCpnt
);
1809 case RECOVERED_ERROR
:
1810 good_bytes
= scsi_bufflen(SCpnt
);
1813 /* This indicates a false check condition, so ignore it. An
1814 * unknown amount of data was transferred so treat it as an
1818 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1820 case ABORTED_COMMAND
:
1821 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1822 good_bytes
= sd_completed_bytes(SCpnt
);
1824 case ILLEGAL_REQUEST
:
1825 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1826 good_bytes
= sd_completed_bytes(SCpnt
);
1827 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1828 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1831 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1836 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1838 sdkp
->device
->no_write_same
= 1;
1839 sd_config_write_same(sdkp
);
1842 req
->__data_len
= blk_rq_bytes(req
);
1843 req
->cmd_flags
|= REQ_QUIET
;
1852 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1853 "sd_done: completed %d of %d bytes\n",
1854 good_bytes
, scsi_bufflen(SCpnt
)));
1856 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1857 sd_dif_complete(SCpnt
, good_bytes
);
1863 * spinup disk - called only in sd_revalidate_disk()
1866 sd_spinup_disk(struct scsi_disk
*sdkp
)
1868 unsigned char cmd
[10];
1869 unsigned long spintime_expire
= 0;
1870 int retries
, spintime
;
1871 unsigned int the_result
;
1872 struct scsi_sense_hdr sshdr
;
1873 int sense_valid
= 0;
1877 /* Spin up drives, as required. Only do this at boot time */
1878 /* Spinup needs to be done for module loads too. */
1883 cmd
[0] = TEST_UNIT_READY
;
1884 memset((void *) &cmd
[1], 0, 9);
1886 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1889 SD_MAX_RETRIES
, NULL
);
1892 * If the drive has indicated to us that it
1893 * doesn't have any media in it, don't bother
1894 * with any more polling.
1896 if (media_not_present(sdkp
, &sshdr
))
1900 sense_valid
= scsi_sense_valid(&sshdr
);
1902 } while (retries
< 3 &&
1903 (!scsi_status_is_good(the_result
) ||
1904 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1905 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1907 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1908 /* no sense, TUR either succeeded or failed
1909 * with a status error */
1910 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1911 sd_print_result(sdkp
, "Test Unit Ready failed",
1918 * The device does not want the automatic start to be issued.
1920 if (sdkp
->device
->no_start_on_add
)
1923 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1924 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1925 break; /* manual intervention required */
1926 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1927 break; /* standby */
1928 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1929 break; /* unavailable */
1931 * Issue command to spin up drive when not ready
1934 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1935 cmd
[0] = START_STOP
;
1936 cmd
[1] = 1; /* Return immediately */
1937 memset((void *) &cmd
[2], 0, 8);
1938 cmd
[4] = 1; /* Start spin cycle */
1939 if (sdkp
->device
->start_stop_pwr_cond
)
1941 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1943 SD_TIMEOUT
, SD_MAX_RETRIES
,
1945 spintime_expire
= jiffies
+ 100 * HZ
;
1948 /* Wait 1 second for next try */
1953 * Wait for USB flash devices with slow firmware.
1954 * Yes, this sense key/ASC combination shouldn't
1955 * occur here. It's characteristic of these devices.
1957 } else if (sense_valid
&&
1958 sshdr
.sense_key
== UNIT_ATTENTION
&&
1959 sshdr
.asc
== 0x28) {
1961 spintime_expire
= jiffies
+ 5 * HZ
;
1964 /* Wait 1 second for next try */
1967 /* we don't understand the sense code, so it's
1968 * probably pointless to loop */
1970 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1971 sd_print_sense_hdr(sdkp
, &sshdr
);
1976 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1979 if (scsi_status_is_good(the_result
))
1982 printk("not responding...\n");
1988 * Determine whether disk supports Data Integrity Field.
1990 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1992 struct scsi_device
*sdp
= sdkp
->device
;
1996 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1999 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2001 if (type
> T10_PI_TYPE3_PROTECTION
)
2003 else if (scsi_host_dif_capable(sdp
->host
, type
))
2006 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
2009 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
2010 " protection type %u. Disabling disk!\n",
2014 sd_printk(KERN_NOTICE
, sdkp
,
2015 "Enabling DIF Type %u protection\n", type
);
2018 sd_printk(KERN_NOTICE
, sdkp
,
2019 "Disabling DIF Type %u protection\n", type
);
2023 sdkp
->protection_type
= type
;
2028 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2029 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
2032 if (driver_byte(the_result
) & DRIVER_SENSE
)
2033 sd_print_sense_hdr(sdkp
, sshdr
);
2035 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
2038 * Set dirty bit for removable devices if not ready -
2039 * sometimes drives will not report this properly.
2041 if (sdp
->removable
&&
2042 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
2043 set_media_not_present(sdkp
);
2046 * We used to set media_present to 0 here to indicate no media
2047 * in the drive, but some drives fail read capacity even with
2048 * media present, so we can't do that.
2050 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
2054 #if RC16_LEN > SD_BUF_SIZE
2055 #error RC16_LEN must not be more than SD_BUF_SIZE
2058 #define READ_CAPACITY_RETRIES_ON_RESET 10
2060 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2061 unsigned char *buffer
)
2063 unsigned char cmd
[16];
2064 struct scsi_sense_hdr sshdr
;
2065 int sense_valid
= 0;
2067 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2068 unsigned int alignment
;
2069 unsigned long long lba
;
2070 unsigned sector_size
;
2072 if (sdp
->no_read_capacity_16
)
2077 cmd
[0] = SERVICE_ACTION_IN_16
;
2078 cmd
[1] = SAI_READ_CAPACITY_16
;
2080 memset(buffer
, 0, RC16_LEN
);
2082 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2083 buffer
, RC16_LEN
, &sshdr
,
2084 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2086 if (media_not_present(sdkp
, &sshdr
))
2090 sense_valid
= scsi_sense_valid(&sshdr
);
2092 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2093 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
2095 /* Invalid Command Operation Code or
2096 * Invalid Field in CDB, just retry
2097 * silently with RC10 */
2100 sshdr
.sense_key
== UNIT_ATTENTION
&&
2101 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2102 /* Device reset might occur several times,
2103 * give it one more chance */
2104 if (--reset_retries
> 0)
2109 } while (the_result
&& retries
);
2112 sd_print_result(sdkp
, "Read Capacity(16) failed", the_result
);
2113 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2117 sector_size
= get_unaligned_be32(&buffer
[8]);
2118 lba
= get_unaligned_be64(&buffer
[0]);
2120 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
2125 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
2126 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2127 "kernel compiled with support for large block "
2133 /* Logical blocks per physical block exponent */
2134 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2136 /* Lowest aligned logical block */
2137 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2138 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2139 if (alignment
&& sdkp
->first_scan
)
2140 sd_printk(KERN_NOTICE
, sdkp
,
2141 "physical block alignment offset: %u\n", alignment
);
2143 if (buffer
[14] & 0x80) { /* LBPME */
2146 if (buffer
[14] & 0x40) /* LBPRZ */
2149 sd_config_discard(sdkp
, SD_LBP_WS16
);
2152 sdkp
->capacity
= lba
+ 1;
2156 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2157 unsigned char *buffer
)
2159 unsigned char cmd
[16];
2160 struct scsi_sense_hdr sshdr
;
2161 int sense_valid
= 0;
2163 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2165 unsigned sector_size
;
2168 cmd
[0] = READ_CAPACITY
;
2169 memset(&cmd
[1], 0, 9);
2170 memset(buffer
, 0, 8);
2172 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2174 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2176 if (media_not_present(sdkp
, &sshdr
))
2180 sense_valid
= scsi_sense_valid(&sshdr
);
2182 sshdr
.sense_key
== UNIT_ATTENTION
&&
2183 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2184 /* Device reset might occur several times,
2185 * give it one more chance */
2186 if (--reset_retries
> 0)
2191 } while (the_result
&& retries
);
2194 sd_print_result(sdkp
, "Read Capacity(10) failed", the_result
);
2195 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2199 sector_size
= get_unaligned_be32(&buffer
[4]);
2200 lba
= get_unaligned_be32(&buffer
[0]);
2202 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2203 /* Some buggy (usb cardreader) devices return an lba of
2204 0xffffffff when the want to report a size of 0 (with
2205 which they really mean no media is present) */
2207 sdkp
->physical_block_size
= sector_size
;
2211 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2212 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2213 "kernel compiled with support for large block "
2219 sdkp
->capacity
= lba
+ 1;
2220 sdkp
->physical_block_size
= sector_size
;
2224 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2226 if (sdp
->host
->max_cmd_len
< 16)
2228 if (sdp
->try_rc_10_first
)
2230 if (sdp
->scsi_level
> SCSI_SPC_2
)
2232 if (scsi_device_protection(sdp
))
2238 * read disk capacity
2241 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2244 struct scsi_device
*sdp
= sdkp
->device
;
2245 sector_t old_capacity
= sdkp
->capacity
;
2247 if (sd_try_rc16_first(sdp
)) {
2248 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2249 if (sector_size
== -EOVERFLOW
)
2251 if (sector_size
== -ENODEV
)
2253 if (sector_size
< 0)
2254 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2255 if (sector_size
< 0)
2258 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2259 if (sector_size
== -EOVERFLOW
)
2261 if (sector_size
< 0)
2263 if ((sizeof(sdkp
->capacity
) > 4) &&
2264 (sdkp
->capacity
> 0xffffffffULL
)) {
2265 int old_sector_size
= sector_size
;
2266 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2267 "Trying to use READ CAPACITY(16).\n");
2268 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2269 if (sector_size
< 0) {
2270 sd_printk(KERN_NOTICE
, sdkp
,
2271 "Using 0xffffffff as device size\n");
2272 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2273 sector_size
= old_sector_size
;
2279 /* Some devices are known to return the total number of blocks,
2280 * not the highest block number. Some devices have versions
2281 * which do this and others which do not. Some devices we might
2282 * suspect of doing this but we don't know for certain.
2284 * If we know the reported capacity is wrong, decrement it. If
2285 * we can only guess, then assume the number of blocks is even
2286 * (usually true but not always) and err on the side of lowering
2289 if (sdp
->fix_capacity
||
2290 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2291 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2292 "from its reported value: %llu\n",
2293 (unsigned long long) sdkp
->capacity
);
2298 if (sector_size
== 0) {
2300 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2304 if (sector_size
!= 512 &&
2305 sector_size
!= 1024 &&
2306 sector_size
!= 2048 &&
2307 sector_size
!= 4096) {
2308 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2311 * The user might want to re-format the drive with
2312 * a supported sectorsize. Once this happens, it
2313 * would be relatively trivial to set the thing up.
2314 * For this reason, we leave the thing in the table.
2318 * set a bogus sector size so the normal read/write
2319 * logic in the block layer will eventually refuse any
2320 * request on this device without tripping over power
2321 * of two sector size assumptions
2325 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2328 char cap_str_2
[10], cap_str_10
[10];
2330 string_get_size(sdkp
->capacity
, sector_size
,
2331 STRING_UNITS_2
, cap_str_2
, sizeof(cap_str_2
));
2332 string_get_size(sdkp
->capacity
, sector_size
,
2333 STRING_UNITS_10
, cap_str_10
,
2334 sizeof(cap_str_10
));
2336 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2337 sd_printk(KERN_NOTICE
, sdkp
,
2338 "%llu %d-byte logical blocks: (%s/%s)\n",
2339 (unsigned long long)sdkp
->capacity
,
2340 sector_size
, cap_str_10
, cap_str_2
);
2342 if (sdkp
->physical_block_size
!= sector_size
)
2343 sd_printk(KERN_NOTICE
, sdkp
,
2344 "%u-byte physical blocks\n",
2345 sdkp
->physical_block_size
);
2349 if (sdkp
->capacity
> 0xffffffff)
2350 sdp
->use_16_for_rw
= 1;
2352 blk_queue_physical_block_size(sdp
->request_queue
,
2353 sdkp
->physical_block_size
);
2354 sdkp
->device
->sector_size
= sector_size
;
2357 /* called with buffer of length 512 */
2359 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2360 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2361 struct scsi_sense_hdr
*sshdr
)
2363 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2364 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2369 * read write protect setting, if possible - called only in sd_revalidate_disk()
2370 * called with buffer of length SD_BUF_SIZE
2373 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2376 struct scsi_device
*sdp
= sdkp
->device
;
2377 struct scsi_mode_data data
;
2378 int old_wp
= sdkp
->write_prot
;
2380 set_disk_ro(sdkp
->disk
, 0);
2381 if (sdp
->skip_ms_page_3f
) {
2382 sd_first_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2386 if (sdp
->use_192_bytes_for_3f
) {
2387 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2390 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2391 * We have to start carefully: some devices hang if we ask
2392 * for more than is available.
2394 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2397 * Second attempt: ask for page 0 When only page 0 is
2398 * implemented, a request for page 3F may return Sense Key
2399 * 5: Illegal Request, Sense Code 24: Invalid field in
2402 if (!scsi_status_is_good(res
))
2403 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2406 * Third attempt: ask 255 bytes, as we did earlier.
2408 if (!scsi_status_is_good(res
))
2409 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2413 if (!scsi_status_is_good(res
)) {
2414 sd_first_printk(KERN_WARNING
, sdkp
,
2415 "Test WP failed, assume Write Enabled\n");
2417 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2418 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2419 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2420 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2421 sdkp
->write_prot
? "on" : "off");
2422 sd_printk(KERN_DEBUG
, sdkp
,
2423 "Mode Sense: %02x %02x %02x %02x\n",
2424 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2430 * sd_read_cache_type - called only from sd_revalidate_disk()
2431 * called with buffer of length SD_BUF_SIZE
2434 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2437 struct scsi_device
*sdp
= sdkp
->device
;
2442 struct scsi_mode_data data
;
2443 struct scsi_sense_hdr sshdr
;
2444 int old_wce
= sdkp
->WCE
;
2445 int old_rcd
= sdkp
->RCD
;
2446 int old_dpofua
= sdkp
->DPOFUA
;
2449 if (sdkp
->cache_override
)
2453 if (sdp
->skip_ms_page_8
) {
2454 if (sdp
->type
== TYPE_RBC
)
2457 if (sdp
->skip_ms_page_3f
)
2460 if (sdp
->use_192_bytes_for_3f
)
2464 } else if (sdp
->type
== TYPE_RBC
) {
2472 /* cautiously ask */
2473 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2476 if (!scsi_status_is_good(res
))
2479 if (!data
.header_length
) {
2482 sd_first_printk(KERN_ERR
, sdkp
,
2483 "Missing header in MODE_SENSE response\n");
2486 /* that went OK, now ask for the proper length */
2490 * We're only interested in the first three bytes, actually.
2491 * But the data cache page is defined for the first 20.
2495 else if (len
> SD_BUF_SIZE
) {
2496 sd_first_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2497 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2500 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2504 if (len
> first_len
)
2505 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2508 if (scsi_status_is_good(res
)) {
2509 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2511 while (offset
< len
) {
2512 u8 page_code
= buffer
[offset
] & 0x3F;
2513 u8 spf
= buffer
[offset
] & 0x40;
2515 if (page_code
== 8 || page_code
== 6) {
2516 /* We're interested only in the first 3 bytes.
2518 if (len
- offset
<= 2) {
2519 sd_first_printk(KERN_ERR
, sdkp
,
2520 "Incomplete mode parameter "
2524 modepage
= page_code
;
2528 /* Go to the next page */
2529 if (spf
&& len
- offset
> 3)
2530 offset
+= 4 + (buffer
[offset
+2] << 8) +
2532 else if (!spf
&& len
- offset
> 1)
2533 offset
+= 2 + buffer
[offset
+1];
2535 sd_first_printk(KERN_ERR
, sdkp
,
2537 "parameter data\n");
2543 sd_first_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2547 if (modepage
== 8) {
2548 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2549 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2551 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2555 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2556 if (sdp
->broken_fua
) {
2557 sd_first_printk(KERN_NOTICE
, sdkp
, "Disabling FUA\n");
2559 } else if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2560 sd_first_printk(KERN_NOTICE
, sdkp
,
2561 "Uses READ/WRITE(6), disabling FUA\n");
2565 /* No cache flush allowed for write protected devices */
2566 if (sdkp
->WCE
&& sdkp
->write_prot
)
2569 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2570 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2571 sd_printk(KERN_NOTICE
, sdkp
,
2572 "Write cache: %s, read cache: %s, %s\n",
2573 sdkp
->WCE
? "enabled" : "disabled",
2574 sdkp
->RCD
? "disabled" : "enabled",
2575 sdkp
->DPOFUA
? "supports DPO and FUA"
2576 : "doesn't support DPO or FUA");
2582 if (scsi_sense_valid(&sshdr
) &&
2583 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2584 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2585 /* Invalid field in CDB */
2586 sd_first_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2588 sd_first_printk(KERN_ERR
, sdkp
,
2589 "Asking for cache data failed\n");
2592 if (sdp
->wce_default_on
) {
2593 sd_first_printk(KERN_NOTICE
, sdkp
,
2594 "Assuming drive cache: write back\n");
2597 sd_first_printk(KERN_ERR
, sdkp
,
2598 "Assuming drive cache: write through\n");
2606 * The ATO bit indicates whether the DIF application tag is available
2607 * for use by the operating system.
2609 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2612 struct scsi_device
*sdp
= sdkp
->device
;
2613 struct scsi_mode_data data
;
2614 struct scsi_sense_hdr sshdr
;
2616 if (sdp
->type
!= TYPE_DISK
)
2619 if (sdkp
->protection_type
== 0)
2622 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2623 SD_MAX_RETRIES
, &data
, &sshdr
);
2625 if (!scsi_status_is_good(res
) || !data
.header_length
||
2627 sd_first_printk(KERN_WARNING
, sdkp
,
2628 "getting Control mode page failed, assume no ATO\n");
2630 if (scsi_sense_valid(&sshdr
))
2631 sd_print_sense_hdr(sdkp
, &sshdr
);
2636 offset
= data
.header_length
+ data
.block_descriptor_length
;
2638 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2639 sd_first_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2643 if ((buffer
[offset
+ 5] & 0x80) == 0)
2652 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2653 * @disk: disk to query
2655 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2657 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2658 const int vpd_len
= 64;
2659 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2662 /* Block Limits VPD */
2663 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2666 blk_queue_io_min(sdkp
->disk
->queue
,
2667 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2669 sdkp
->max_xfer_blocks
= get_unaligned_be32(&buffer
[8]);
2670 sdkp
->opt_xfer_blocks
= get_unaligned_be32(&buffer
[12]);
2672 if (buffer
[3] == 0x3c) {
2673 unsigned int lba_count
, desc_count
;
2675 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2680 lba_count
= get_unaligned_be32(&buffer
[20]);
2681 desc_count
= get_unaligned_be32(&buffer
[24]);
2683 if (lba_count
&& desc_count
)
2684 sdkp
->max_unmap_blocks
= lba_count
;
2686 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2688 if (buffer
[32] & 0x80)
2689 sdkp
->unmap_alignment
=
2690 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2692 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2694 if (sdkp
->max_unmap_blocks
)
2695 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2697 sd_config_discard(sdkp
, SD_LBP_WS16
);
2699 } else { /* LBP VPD page tells us what to use */
2700 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
&& !sdkp
->lbprz
)
2701 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2702 else if (sdkp
->lbpws
)
2703 sd_config_discard(sdkp
, SD_LBP_WS16
);
2704 else if (sdkp
->lbpws10
)
2705 sd_config_discard(sdkp
, SD_LBP_WS10
);
2706 else if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2707 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2709 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2718 * sd_read_block_characteristics - Query block dev. characteristics
2719 * @disk: disk to query
2721 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2723 unsigned char *buffer
;
2725 const int vpd_len
= 64;
2727 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2730 /* Block Device Characteristics VPD */
2731 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2734 rot
= get_unaligned_be16(&buffer
[4]);
2737 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2738 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM
, sdkp
->disk
->queue
);
2746 * sd_read_block_provisioning - Query provisioning VPD page
2747 * @disk: disk to query
2749 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2751 unsigned char *buffer
;
2752 const int vpd_len
= 8;
2754 if (sdkp
->lbpme
== 0)
2757 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2759 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2763 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2764 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2765 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2771 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2773 struct scsi_device
*sdev
= sdkp
->device
;
2775 if (sdev
->host
->no_write_same
) {
2776 sdev
->no_write_same
= 1;
2781 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2782 /* too large values might cause issues with arcmsr */
2783 int vpd_buf_len
= 64;
2785 sdev
->no_report_opcodes
= 1;
2787 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2788 * CODES is unsupported and the device has an ATA
2789 * Information VPD page (SAT).
2791 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2792 sdev
->no_write_same
= 1;
2795 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2798 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2803 * sd_revalidate_disk - called the first time a new disk is seen,
2804 * performs disk spin up, read_capacity, etc.
2805 * @disk: struct gendisk we care about
2807 static int sd_revalidate_disk(struct gendisk
*disk
)
2809 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2810 struct scsi_device
*sdp
= sdkp
->device
;
2811 struct request_queue
*q
= sdkp
->disk
->queue
;
2812 unsigned char *buffer
;
2813 unsigned int dev_max
, rw_max
;
2815 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2816 "sd_revalidate_disk\n"));
2819 * If the device is offline, don't try and read capacity or any
2820 * of the other niceties.
2822 if (!scsi_device_online(sdp
))
2825 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2827 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2828 "allocation failure.\n");
2832 sd_spinup_disk(sdkp
);
2835 * Without media there is no reason to ask; moreover, some devices
2836 * react badly if we do.
2838 if (sdkp
->media_present
) {
2839 sd_read_capacity(sdkp
, buffer
);
2841 if (scsi_device_supports_vpd(sdp
)) {
2842 sd_read_block_provisioning(sdkp
);
2843 sd_read_block_limits(sdkp
);
2844 sd_read_block_characteristics(sdkp
);
2847 sd_read_write_protect_flag(sdkp
, buffer
);
2848 sd_read_cache_type(sdkp
, buffer
);
2849 sd_read_app_tag_own(sdkp
, buffer
);
2850 sd_read_write_same(sdkp
, buffer
);
2853 sdkp
->first_scan
= 0;
2856 * We now have all cache related info, determine how we deal
2857 * with flush requests.
2859 sd_set_flush_flag(sdkp
);
2861 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2862 dev_max
= sdp
->use_16_for_rw
? SD_MAX_XFER_BLOCKS
: SD_DEF_XFER_BLOCKS
;
2864 /* Some devices report a maximum block count for READ/WRITE requests. */
2865 dev_max
= min_not_zero(dev_max
, sdkp
->max_xfer_blocks
);
2866 q
->limits
.max_dev_sectors
= logical_to_sectors(sdp
, dev_max
);
2869 * Use the device's preferred I/O size for reads and writes
2870 * unless the reported value is unreasonably small, large, or
2873 if (sdkp
->opt_xfer_blocks
&&
2874 sdkp
->opt_xfer_blocks
<= dev_max
&&
2875 sdkp
->opt_xfer_blocks
<= SD_DEF_XFER_BLOCKS
&&
2876 logical_to_bytes(sdp
, sdkp
->opt_xfer_blocks
) >= PAGE_SIZE
) {
2877 q
->limits
.io_opt
= logical_to_bytes(sdp
, sdkp
->opt_xfer_blocks
);
2878 rw_max
= logical_to_sectors(sdp
, sdkp
->opt_xfer_blocks
);
2880 rw_max
= BLK_DEF_MAX_SECTORS
;
2882 /* Combine with controller limits */
2883 q
->limits
.max_sectors
= min(rw_max
, queue_max_hw_sectors(q
));
2885 set_capacity(disk
, logical_to_sectors(sdp
, sdkp
->capacity
));
2886 sd_config_write_same(sdkp
);
2894 * sd_unlock_native_capacity - unlock native capacity
2895 * @disk: struct gendisk to set capacity for
2897 * Block layer calls this function if it detects that partitions
2898 * on @disk reach beyond the end of the device. If the SCSI host
2899 * implements ->unlock_native_capacity() method, it's invoked to
2900 * give it a chance to adjust the device capacity.
2903 * Defined by block layer. Might sleep.
2905 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2907 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2909 if (sdev
->host
->hostt
->unlock_native_capacity
)
2910 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2914 * sd_format_disk_name - format disk name
2915 * @prefix: name prefix - ie. "sd" for SCSI disks
2916 * @index: index of the disk to format name for
2917 * @buf: output buffer
2918 * @buflen: length of the output buffer
2920 * SCSI disk names starts at sda. The 26th device is sdz and the
2921 * 27th is sdaa. The last one for two lettered suffix is sdzz
2922 * which is followed by sdaaa.
2924 * This is basically 26 base counting with one extra 'nil' entry
2925 * at the beginning from the second digit on and can be
2926 * determined using similar method as 26 base conversion with the
2927 * index shifted -1 after each digit is computed.
2933 * 0 on success, -errno on failure.
2935 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2937 const int base
= 'z' - 'a' + 1;
2938 char *begin
= buf
+ strlen(prefix
);
2939 char *end
= buf
+ buflen
;
2949 *--p
= 'a' + (index
% unit
);
2950 index
= (index
/ unit
) - 1;
2951 } while (index
>= 0);
2953 memmove(begin
, p
, end
- p
);
2954 memcpy(buf
, prefix
, strlen(prefix
));
2960 * The asynchronous part of sd_probe
2962 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2964 struct scsi_disk
*sdkp
= data
;
2965 struct scsi_device
*sdp
;
2972 index
= sdkp
->index
;
2973 dev
= &sdp
->sdev_gendev
;
2975 gd
->major
= sd_major((index
& 0xf0) >> 4);
2976 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2977 gd
->minors
= SD_MINORS
;
2979 gd
->fops
= &sd_fops
;
2980 gd
->private_data
= &sdkp
->driver
;
2981 gd
->queue
= sdkp
->device
->request_queue
;
2983 /* defaults, until the device tells us otherwise */
2984 sdp
->sector_size
= 512;
2986 sdkp
->media_present
= 1;
2987 sdkp
->write_prot
= 0;
2988 sdkp
->cache_override
= 0;
2992 sdkp
->first_scan
= 1;
2993 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2995 sd_revalidate_disk(gd
);
2997 gd
->flags
= GENHD_FL_EXT_DEVT
;
2998 if (sdp
->removable
) {
2999 gd
->flags
|= GENHD_FL_REMOVABLE
;
3000 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
3003 blk_pm_runtime_init(sdp
->request_queue
, dev
);
3004 device_add_disk(dev
, gd
);
3006 sd_dif_config_host(sdkp
);
3008 sd_revalidate_disk(gd
);
3010 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
3011 sdp
->removable
? "removable " : "");
3012 scsi_autopm_put_device(sdp
);
3013 put_device(&sdkp
->dev
);
3017 * sd_probe - called during driver initialization and whenever a
3018 * new scsi device is attached to the system. It is called once
3019 * for each scsi device (not just disks) present.
3020 * @dev: pointer to device object
3022 * Returns 0 if successful (or not interested in this scsi device
3023 * (e.g. scanner)); 1 when there is an error.
3025 * Note: this function is invoked from the scsi mid-level.
3026 * This function sets up the mapping between a given
3027 * <host,channel,id,lun> (found in sdp) and new device name
3028 * (e.g. /dev/sda). More precisely it is the block device major
3029 * and minor number that is chosen here.
3031 * Assume sd_probe is not re-entrant (for time being)
3032 * Also think about sd_probe() and sd_remove() running coincidentally.
3034 static int sd_probe(struct device
*dev
)
3036 struct scsi_device
*sdp
= to_scsi_device(dev
);
3037 struct scsi_disk
*sdkp
;
3042 scsi_autopm_get_device(sdp
);
3044 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
3047 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
3051 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
3055 gd
= alloc_disk(SD_MINORS
);
3060 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
3063 spin_lock(&sd_index_lock
);
3064 error
= ida_get_new(&sd_index_ida
, &index
);
3065 spin_unlock(&sd_index_lock
);
3066 } while (error
== -EAGAIN
);
3069 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
3073 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
3075 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
3076 goto out_free_index
;
3080 sdkp
->driver
= &sd_template
;
3082 sdkp
->index
= index
;
3083 atomic_set(&sdkp
->openers
, 0);
3084 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
3086 if (!sdp
->request_queue
->rq_timeout
) {
3087 if (sdp
->type
!= TYPE_MOD
)
3088 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
3090 blk_queue_rq_timeout(sdp
->request_queue
,
3094 device_initialize(&sdkp
->dev
);
3095 sdkp
->dev
.parent
= dev
;
3096 sdkp
->dev
.class = &sd_disk_class
;
3097 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
3099 error
= device_add(&sdkp
->dev
);
3101 goto out_free_index
;
3104 dev_set_drvdata(dev
, sdkp
);
3106 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
3107 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
3112 spin_lock(&sd_index_lock
);
3113 ida_remove(&sd_index_ida
, index
);
3114 spin_unlock(&sd_index_lock
);
3120 scsi_autopm_put_device(sdp
);
3125 * sd_remove - called whenever a scsi disk (previously recognized by
3126 * sd_probe) is detached from the system. It is called (potentially
3127 * multiple times) during sd module unload.
3128 * @sdp: pointer to mid level scsi device object
3130 * Note: this function is invoked from the scsi mid-level.
3131 * This function potentially frees up a device name (e.g. /dev/sdc)
3132 * that could be re-used by a subsequent sd_probe().
3133 * This function is not called when the built-in sd driver is "exit-ed".
3135 static int sd_remove(struct device
*dev
)
3137 struct scsi_disk
*sdkp
;
3140 sdkp
= dev_get_drvdata(dev
);
3141 devt
= disk_devt(sdkp
->disk
);
3142 scsi_autopm_get_device(sdkp
->device
);
3144 async_synchronize_full_domain(&scsi_sd_pm_domain
);
3145 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3146 device_del(&sdkp
->dev
);
3147 del_gendisk(sdkp
->disk
);
3150 blk_register_region(devt
, SD_MINORS
, NULL
,
3151 sd_default_probe
, NULL
, NULL
);
3153 mutex_lock(&sd_ref_mutex
);
3154 dev_set_drvdata(dev
, NULL
);
3155 put_device(&sdkp
->dev
);
3156 mutex_unlock(&sd_ref_mutex
);
3162 * scsi_disk_release - Called to free the scsi_disk structure
3163 * @dev: pointer to embedded class device
3165 * sd_ref_mutex must be held entering this routine. Because it is
3166 * called on last put, you should always use the scsi_disk_get()
3167 * scsi_disk_put() helpers which manipulate the semaphore directly
3168 * and never do a direct put_device.
3170 static void scsi_disk_release(struct device
*dev
)
3172 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3173 struct gendisk
*disk
= sdkp
->disk
;
3175 spin_lock(&sd_index_lock
);
3176 ida_remove(&sd_index_ida
, sdkp
->index
);
3177 spin_unlock(&sd_index_lock
);
3179 disk
->private_data
= NULL
;
3181 put_device(&sdkp
->device
->sdev_gendev
);
3186 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3188 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3189 struct scsi_sense_hdr sshdr
;
3190 struct scsi_device
*sdp
= sdkp
->device
;
3194 cmd
[4] |= 1; /* START */
3196 if (sdp
->start_stop_pwr_cond
)
3197 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3199 if (!scsi_device_online(sdp
))
3202 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3203 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, REQ_PM
);
3205 sd_print_result(sdkp
, "Start/Stop Unit failed", res
);
3206 if (driver_byte(res
) & DRIVER_SENSE
)
3207 sd_print_sense_hdr(sdkp
, &sshdr
);
3208 if (scsi_sense_valid(&sshdr
) &&
3209 /* 0x3a is medium not present */
3214 /* SCSI error codes must not go to the generic layer */
3222 * Send a SYNCHRONIZE CACHE instruction down to the device through
3223 * the normal SCSI command structure. Wait for the command to
3226 static void sd_shutdown(struct device
*dev
)
3228 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3231 return; /* this can happen */
3233 if (pm_runtime_suspended(dev
))
3236 if (sdkp
->WCE
&& sdkp
->media_present
) {
3237 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3238 sd_sync_cache(sdkp
);
3241 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3242 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3243 sd_start_stop_device(sdkp
, 0);
3247 static int sd_suspend_common(struct device
*dev
, bool ignore_stop_errors
)
3249 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3252 if (!sdkp
) /* E.g.: runtime suspend following sd_remove() */
3255 if (sdkp
->WCE
&& sdkp
->media_present
) {
3256 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3257 ret
= sd_sync_cache(sdkp
);
3259 /* ignore OFFLINE device */
3266 if (sdkp
->device
->manage_start_stop
) {
3267 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3268 /* an error is not worth aborting a system sleep */
3269 ret
= sd_start_stop_device(sdkp
, 0);
3270 if (ignore_stop_errors
)
3278 static int sd_suspend_system(struct device
*dev
)
3280 return sd_suspend_common(dev
, true);
3283 static int sd_suspend_runtime(struct device
*dev
)
3285 return sd_suspend_common(dev
, false);
3288 static int sd_resume(struct device
*dev
)
3290 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3292 if (!sdkp
) /* E.g.: runtime resume at the start of sd_probe() */
3295 if (!sdkp
->device
->manage_start_stop
)
3298 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3299 return sd_start_stop_device(sdkp
, 1);
3303 * init_sd - entry point for this driver (both when built in or when
3306 * Note: this function registers this driver with the scsi mid-level.
3308 static int __init
init_sd(void)
3310 int majors
= 0, i
, err
;
3312 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3314 for (i
= 0; i
< SD_MAJORS
; i
++) {
3315 if (register_blkdev(sd_major(i
), "sd") != 0)
3318 blk_register_region(sd_major(i
), SD_MINORS
, NULL
,
3319 sd_default_probe
, NULL
, NULL
);
3325 err
= class_register(&sd_disk_class
);
3329 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3331 if (!sd_cdb_cache
) {
3332 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3337 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3339 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3344 err
= scsi_register_driver(&sd_template
.gendrv
);
3346 goto err_out_driver
;
3351 mempool_destroy(sd_cdb_pool
);
3354 kmem_cache_destroy(sd_cdb_cache
);
3357 class_unregister(&sd_disk_class
);
3359 for (i
= 0; i
< SD_MAJORS
; i
++)
3360 unregister_blkdev(sd_major(i
), "sd");
3365 * exit_sd - exit point for this driver (when it is a module).
3367 * Note: this function unregisters this driver from the scsi mid-level.
3369 static void __exit
exit_sd(void)
3373 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3375 scsi_unregister_driver(&sd_template
.gendrv
);
3376 mempool_destroy(sd_cdb_pool
);
3377 kmem_cache_destroy(sd_cdb_cache
);
3379 class_unregister(&sd_disk_class
);
3381 for (i
= 0; i
< SD_MAJORS
; i
++) {
3382 blk_unregister_region(sd_major(i
), SD_MINORS
);
3383 unregister_blkdev(sd_major(i
), "sd");
3387 module_init(init_sd
);
3388 module_exit(exit_sd
);
3390 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3391 struct scsi_sense_hdr
*sshdr
)
3393 scsi_print_sense_hdr(sdkp
->device
,
3394 sdkp
->disk
? sdkp
->disk
->disk_name
: NULL
, sshdr
);
3397 static void sd_print_result(const struct scsi_disk
*sdkp
, const char *msg
,
3400 const char *hb_string
= scsi_hostbyte_string(result
);
3401 const char *db_string
= scsi_driverbyte_string(result
);
3403 if (hb_string
|| db_string
)
3404 sd_printk(KERN_INFO
, sdkp
,
3405 "%s: Result: hostbyte=%s driverbyte=%s\n", msg
,
3406 hb_string
? hb_string
: "invalid",
3407 db_string
? db_string
: "invalid");
3409 sd_printk(KERN_INFO
, sdkp
,
3410 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3411 msg
, host_byte(result
), driver_byte(result
));