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 <linux/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
);
96 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC
);
98 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
104 static void sd_config_discard(struct scsi_disk
*, unsigned int);
105 static void sd_config_write_same(struct scsi_disk
*);
106 static int sd_revalidate_disk(struct gendisk
*);
107 static void sd_unlock_native_capacity(struct gendisk
*disk
);
108 static int sd_probe(struct device
*);
109 static int sd_remove(struct device
*);
110 static void sd_shutdown(struct device
*);
111 static int sd_suspend_system(struct device
*);
112 static int sd_suspend_runtime(struct device
*);
113 static int sd_resume(struct device
*);
114 static void sd_rescan(struct device
*);
115 static int sd_init_command(struct scsi_cmnd
*SCpnt
);
116 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
);
117 static int sd_done(struct scsi_cmnd
*);
118 static int sd_eh_action(struct scsi_cmnd
*, int);
119 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
120 static void scsi_disk_release(struct device
*cdev
);
121 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
122 static void sd_print_result(const struct scsi_disk
*, const char *, int);
124 static DEFINE_SPINLOCK(sd_index_lock
);
125 static DEFINE_IDA(sd_index_ida
);
127 /* This semaphore is used to mediate the 0->1 reference get in the
128 * face of object destruction (i.e. we can't allow a get on an
129 * object after last put) */
130 static DEFINE_MUTEX(sd_ref_mutex
);
132 static struct kmem_cache
*sd_cdb_cache
;
133 static mempool_t
*sd_cdb_pool
;
135 static const char *sd_cache_types
[] = {
136 "write through", "none", "write back",
137 "write back, no read (daft)"
140 static void sd_set_flush_flag(struct scsi_disk
*sdkp
)
142 bool wc
= false, fua
= false;
150 blk_queue_write_cache(sdkp
->disk
->queue
, wc
, fua
);
154 cache_type_store(struct device
*dev
, struct device_attribute
*attr
,
155 const char *buf
, size_t count
)
157 int i
, ct
= -1, rcd
, wce
, sp
;
158 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
159 struct scsi_device
*sdp
= sdkp
->device
;
162 struct scsi_mode_data data
;
163 struct scsi_sense_hdr sshdr
;
164 static const char temp
[] = "temporary ";
167 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_ZBC
)
168 /* no cache control on RBC devices; theoretically they
169 * can do it, but there's probably so many exceptions
170 * it's not worth the risk */
173 if (strncmp(buf
, temp
, sizeof(temp
) - 1) == 0) {
174 buf
+= sizeof(temp
) - 1;
175 sdkp
->cache_override
= 1;
177 sdkp
->cache_override
= 0;
180 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
181 len
= strlen(sd_cache_types
[i
]);
182 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
190 rcd
= ct
& 0x01 ? 1 : 0;
191 wce
= (ct
& 0x02) && !sdkp
->write_prot
? 1 : 0;
193 if (sdkp
->cache_override
) {
196 sd_set_flush_flag(sdkp
);
200 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
201 SD_MAX_RETRIES
, &data
, NULL
))
203 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
204 data
.block_descriptor_length
);
205 buffer_data
= buffer
+ data
.header_length
+
206 data
.block_descriptor_length
;
207 buffer_data
[2] &= ~0x05;
208 buffer_data
[2] |= wce
<< 2 | rcd
;
209 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
210 buffer_data
[0] &= ~0x80;
212 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
213 SD_MAX_RETRIES
, &data
, &sshdr
)) {
214 if (scsi_sense_valid(&sshdr
))
215 sd_print_sense_hdr(sdkp
, &sshdr
);
218 revalidate_disk(sdkp
->disk
);
223 manage_start_stop_show(struct device
*dev
, struct device_attribute
*attr
,
226 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
227 struct scsi_device
*sdp
= sdkp
->device
;
229 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
233 manage_start_stop_store(struct device
*dev
, struct device_attribute
*attr
,
234 const char *buf
, size_t count
)
236 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
237 struct scsi_device
*sdp
= sdkp
->device
;
239 if (!capable(CAP_SYS_ADMIN
))
242 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
246 static DEVICE_ATTR_RW(manage_start_stop
);
249 allow_restart_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
251 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
253 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
257 allow_restart_store(struct device
*dev
, struct device_attribute
*attr
,
258 const char *buf
, size_t count
)
260 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
261 struct scsi_device
*sdp
= sdkp
->device
;
263 if (!capable(CAP_SYS_ADMIN
))
266 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_ZBC
)
269 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
273 static DEVICE_ATTR_RW(allow_restart
);
276 cache_type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
278 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
279 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
281 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
283 static DEVICE_ATTR_RW(cache_type
);
286 FUA_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
288 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
290 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
292 static DEVICE_ATTR_RO(FUA
);
295 protection_type_show(struct device
*dev
, struct device_attribute
*attr
,
298 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
300 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
304 protection_type_store(struct device
*dev
, struct device_attribute
*attr
,
305 const char *buf
, size_t count
)
307 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
311 if (!capable(CAP_SYS_ADMIN
))
314 err
= kstrtouint(buf
, 10, &val
);
319 if (val
>= 0 && val
<= T10_PI_TYPE3_PROTECTION
)
320 sdkp
->protection_type
= val
;
324 static DEVICE_ATTR_RW(protection_type
);
327 protection_mode_show(struct device
*dev
, struct device_attribute
*attr
,
330 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
331 struct scsi_device
*sdp
= sdkp
->device
;
332 unsigned int dif
, dix
;
334 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
335 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
337 if (!dix
&& scsi_host_dix_capable(sdp
->host
, T10_PI_TYPE0_PROTECTION
)) {
343 return snprintf(buf
, 20, "none\n");
345 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
347 static DEVICE_ATTR_RO(protection_mode
);
350 app_tag_own_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
352 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
354 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
356 static DEVICE_ATTR_RO(app_tag_own
);
359 thin_provisioning_show(struct device
*dev
, struct device_attribute
*attr
,
362 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
364 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
366 static DEVICE_ATTR_RO(thin_provisioning
);
368 static const char *lbp_mode
[] = {
369 [SD_LBP_FULL
] = "full",
370 [SD_LBP_UNMAP
] = "unmap",
371 [SD_LBP_WS16
] = "writesame_16",
372 [SD_LBP_WS10
] = "writesame_10",
373 [SD_LBP_ZERO
] = "writesame_zero",
374 [SD_LBP_DISABLE
] = "disabled",
378 provisioning_mode_show(struct device
*dev
, struct device_attribute
*attr
,
381 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
383 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
387 provisioning_mode_store(struct device
*dev
, struct device_attribute
*attr
,
388 const char *buf
, size_t count
)
390 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
391 struct scsi_device
*sdp
= sdkp
->device
;
393 if (!capable(CAP_SYS_ADMIN
))
396 if (sd_is_zoned(sdkp
)) {
397 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
401 if (sdp
->type
!= TYPE_DISK
)
404 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
405 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
406 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
407 sd_config_discard(sdkp
, SD_LBP_WS16
);
408 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
409 sd_config_discard(sdkp
, SD_LBP_WS10
);
410 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
411 sd_config_discard(sdkp
, SD_LBP_ZERO
);
412 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
413 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
419 static DEVICE_ATTR_RW(provisioning_mode
);
422 max_medium_access_timeouts_show(struct device
*dev
,
423 struct device_attribute
*attr
, char *buf
)
425 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
427 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
431 max_medium_access_timeouts_store(struct device
*dev
,
432 struct device_attribute
*attr
, const char *buf
,
435 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
438 if (!capable(CAP_SYS_ADMIN
))
441 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
443 return err
? err
: count
;
445 static DEVICE_ATTR_RW(max_medium_access_timeouts
);
448 max_write_same_blocks_show(struct device
*dev
, struct device_attribute
*attr
,
451 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
453 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
457 max_write_same_blocks_store(struct device
*dev
, struct device_attribute
*attr
,
458 const char *buf
, size_t count
)
460 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
461 struct scsi_device
*sdp
= sdkp
->device
;
465 if (!capable(CAP_SYS_ADMIN
))
468 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_ZBC
)
471 err
= kstrtoul(buf
, 10, &max
);
477 sdp
->no_write_same
= 1;
478 else if (max
<= SD_MAX_WS16_BLOCKS
) {
479 sdp
->no_write_same
= 0;
480 sdkp
->max_ws_blocks
= max
;
483 sd_config_write_same(sdkp
);
487 static DEVICE_ATTR_RW(max_write_same_blocks
);
489 static struct attribute
*sd_disk_attrs
[] = {
490 &dev_attr_cache_type
.attr
,
492 &dev_attr_allow_restart
.attr
,
493 &dev_attr_manage_start_stop
.attr
,
494 &dev_attr_protection_type
.attr
,
495 &dev_attr_protection_mode
.attr
,
496 &dev_attr_app_tag_own
.attr
,
497 &dev_attr_thin_provisioning
.attr
,
498 &dev_attr_provisioning_mode
.attr
,
499 &dev_attr_max_write_same_blocks
.attr
,
500 &dev_attr_max_medium_access_timeouts
.attr
,
503 ATTRIBUTE_GROUPS(sd_disk
);
505 static struct class sd_disk_class
= {
507 .owner
= THIS_MODULE
,
508 .dev_release
= scsi_disk_release
,
509 .dev_groups
= sd_disk_groups
,
512 static const struct dev_pm_ops sd_pm_ops
= {
513 .suspend
= sd_suspend_system
,
515 .poweroff
= sd_suspend_system
,
516 .restore
= sd_resume
,
517 .runtime_suspend
= sd_suspend_runtime
,
518 .runtime_resume
= sd_resume
,
521 static struct scsi_driver sd_template
= {
524 .owner
= THIS_MODULE
,
527 .shutdown
= sd_shutdown
,
531 .init_command
= sd_init_command
,
532 .uninit_command
= sd_uninit_command
,
534 .eh_action
= sd_eh_action
,
538 * Dummy kobj_map->probe function.
539 * The default ->probe function will call modprobe, which is
540 * pointless as this module is already loaded.
542 static struct kobject
*sd_default_probe(dev_t devt
, int *partno
, void *data
)
548 * Device no to disk mapping:
550 * major disc2 disc p1
551 * |............|.............|....|....| <- dev_t
554 * Inside a major, we have 16k disks, however mapped non-
555 * contiguously. The first 16 disks are for major0, the next
556 * ones with major1, ... Disk 256 is for major0 again, disk 272
558 * As we stay compatible with our numbering scheme, we can reuse
559 * the well-know SCSI majors 8, 65--71, 136--143.
561 static int sd_major(int major_idx
)
565 return SCSI_DISK0_MAJOR
;
567 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
569 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
572 return 0; /* shut up gcc */
576 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
578 struct scsi_disk
*sdkp
= NULL
;
580 mutex_lock(&sd_ref_mutex
);
582 if (disk
->private_data
) {
583 sdkp
= scsi_disk(disk
);
584 if (scsi_device_get(sdkp
->device
) == 0)
585 get_device(&sdkp
->dev
);
589 mutex_unlock(&sd_ref_mutex
);
593 static void scsi_disk_put(struct scsi_disk
*sdkp
)
595 struct scsi_device
*sdev
= sdkp
->device
;
597 mutex_lock(&sd_ref_mutex
);
598 put_device(&sdkp
->dev
);
599 scsi_device_put(sdev
);
600 mutex_unlock(&sd_ref_mutex
);
603 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd
*scmd
,
604 unsigned int dix
, unsigned int dif
)
606 struct bio
*bio
= scmd
->request
->bio
;
607 unsigned int prot_op
= sd_prot_op(rq_data_dir(scmd
->request
), dix
, dif
);
608 unsigned int protect
= 0;
610 if (dix
) { /* DIX Type 0, 1, 2, 3 */
611 if (bio_integrity_flagged(bio
, BIP_IP_CHECKSUM
))
612 scmd
->prot_flags
|= SCSI_PROT_IP_CHECKSUM
;
614 if (bio_integrity_flagged(bio
, BIP_CTRL_NOCHECK
) == false)
615 scmd
->prot_flags
|= SCSI_PROT_GUARD_CHECK
;
618 if (dif
!= T10_PI_TYPE3_PROTECTION
) { /* DIX/DIF Type 0, 1, 2 */
619 scmd
->prot_flags
|= SCSI_PROT_REF_INCREMENT
;
621 if (bio_integrity_flagged(bio
, BIP_CTRL_NOCHECK
) == false)
622 scmd
->prot_flags
|= SCSI_PROT_REF_CHECK
;
625 if (dif
) { /* DIX/DIF Type 1, 2, 3 */
626 scmd
->prot_flags
|= SCSI_PROT_TRANSFER_PI
;
628 if (bio_integrity_flagged(bio
, BIP_DISK_NOCHECK
))
629 protect
= 3 << 5; /* Disable target PI checking */
631 protect
= 1 << 5; /* Enable target PI checking */
634 scsi_set_prot_op(scmd
, prot_op
);
635 scsi_set_prot_type(scmd
, dif
);
636 scmd
->prot_flags
&= sd_prot_flag_mask(prot_op
);
641 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
643 struct request_queue
*q
= sdkp
->disk
->queue
;
644 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
645 unsigned int max_blocks
= 0;
647 q
->limits
.discard_zeroes_data
= 0;
650 * When LBPRZ is reported, discard alignment and granularity
651 * must be fixed to the logical block size. Otherwise the block
652 * layer will drop misaligned portions of the request which can
653 * lead to data corruption. If LBPRZ is not set, we honor the
657 q
->limits
.discard_alignment
= 0;
658 q
->limits
.discard_granularity
= logical_block_size
;
660 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
662 q
->limits
.discard_granularity
=
663 max(sdkp
->physical_block_size
,
664 sdkp
->unmap_granularity
* logical_block_size
);
667 sdkp
->provisioning_mode
= mode
;
672 blk_queue_max_discard_sectors(q
, 0);
673 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
677 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
678 (u32
)SD_MAX_WS16_BLOCKS
);
682 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
683 (u32
)SD_MAX_WS16_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
= sdkp
->lbprz
;
694 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
695 (u32
)SD_MAX_WS10_BLOCKS
);
696 q
->limits
.discard_zeroes_data
= 1;
700 blk_queue_max_discard_sectors(q
, max_blocks
* (logical_block_size
>> 9));
701 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
705 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
706 * @sdp: scsi device to operate one
707 * @rq: Request to prepare
709 * Will issue either UNMAP or WRITE SAME(16) depending on preference
710 * indicated by target device.
712 static int sd_setup_discard_cmnd(struct scsi_cmnd
*cmd
)
714 struct request
*rq
= cmd
->request
;
715 struct scsi_device
*sdp
= cmd
->device
;
716 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
717 sector_t sector
= blk_rq_pos(rq
);
718 unsigned int nr_sectors
= blk_rq_sectors(rq
);
724 sector
>>= ilog2(sdp
->sector_size
) - 9;
725 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
727 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
729 return BLKPREP_DEFER
;
731 switch (sdkp
->provisioning_mode
) {
733 buf
= page_address(page
);
736 cmd
->cmnd
[0] = UNMAP
;
739 put_unaligned_be16(6 + 16, &buf
[0]);
740 put_unaligned_be16(16, &buf
[2]);
741 put_unaligned_be64(sector
, &buf
[8]);
742 put_unaligned_be32(nr_sectors
, &buf
[16]);
749 cmd
->cmnd
[0] = WRITE_SAME_16
;
750 cmd
->cmnd
[1] = 0x8; /* UNMAP */
751 put_unaligned_be64(sector
, &cmd
->cmnd
[2]);
752 put_unaligned_be32(nr_sectors
, &cmd
->cmnd
[10]);
754 len
= sdkp
->device
->sector_size
;
760 cmd
->cmnd
[0] = WRITE_SAME
;
761 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
762 cmd
->cmnd
[1] = 0x8; /* UNMAP */
763 put_unaligned_be32(sector
, &cmd
->cmnd
[2]);
764 put_unaligned_be16(nr_sectors
, &cmd
->cmnd
[7]);
766 len
= sdkp
->device
->sector_size
;
770 ret
= BLKPREP_INVALID
;
774 rq
->timeout
= SD_TIMEOUT
;
776 cmd
->transfersize
= len
;
777 cmd
->allowed
= SD_MAX_RETRIES
;
779 rq
->special_vec
.bv_page
= page
;
780 rq
->special_vec
.bv_offset
= 0;
781 rq
->special_vec
.bv_len
= len
;
783 rq
->rq_flags
|= RQF_SPECIAL_PAYLOAD
;
784 scsi_req(rq
)->resid_len
= len
;
786 ret
= scsi_init_io(cmd
);
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
);
841 if (sdkp
->device
->no_write_same
)
842 return BLKPREP_INVALID
;
844 BUG_ON(bio_offset(bio
) || bio_iovec(bio
).bv_len
!= sdp
->sector_size
);
846 if (sd_is_zoned(sdkp
)) {
847 ret
= sd_zbc_setup_write_cmnd(cmd
);
848 if (ret
!= BLKPREP_OK
)
852 sector
>>= ilog2(sdp
->sector_size
) - 9;
853 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
855 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
857 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
859 cmd
->cmnd
[0] = WRITE_SAME_16
;
860 put_unaligned_be64(sector
, &cmd
->cmnd
[2]);
861 put_unaligned_be32(nr_sectors
, &cmd
->cmnd
[10]);
864 cmd
->cmnd
[0] = WRITE_SAME
;
865 put_unaligned_be32(sector
, &cmd
->cmnd
[2]);
866 put_unaligned_be16(nr_sectors
, &cmd
->cmnd
[7]);
869 cmd
->transfersize
= sdp
->sector_size
;
870 cmd
->allowed
= SD_MAX_RETRIES
;
871 return scsi_init_io(cmd
);
874 static int sd_setup_flush_cmnd(struct scsi_cmnd
*cmd
)
876 struct request
*rq
= cmd
->request
;
878 /* flush requests don't perform I/O, zero the S/G table */
879 memset(&cmd
->sdb
, 0, sizeof(cmd
->sdb
));
881 cmd
->cmnd
[0] = SYNCHRONIZE_CACHE
;
883 cmd
->transfersize
= 0;
884 cmd
->allowed
= SD_MAX_RETRIES
;
886 rq
->timeout
= rq
->q
->rq_timeout
* SD_FLUSH_TIMEOUT_MULTIPLIER
;
890 static int sd_setup_read_write_cmnd(struct scsi_cmnd
*SCpnt
)
892 struct request
*rq
= SCpnt
->request
;
893 struct scsi_device
*sdp
= SCpnt
->device
;
894 struct gendisk
*disk
= rq
->rq_disk
;
895 struct scsi_disk
*sdkp
= scsi_disk(disk
);
896 sector_t block
= blk_rq_pos(rq
);
898 unsigned int this_count
= blk_rq_sectors(rq
);
899 unsigned int dif
, dix
;
900 bool zoned_write
= sd_is_zoned(sdkp
) && rq_data_dir(rq
) == WRITE
;
902 unsigned char protect
;
905 ret
= sd_zbc_setup_write_cmnd(SCpnt
);
906 if (ret
!= BLKPREP_OK
)
910 ret
= scsi_init_io(SCpnt
);
911 if (ret
!= BLKPREP_OK
)
915 /* from here on until we're complete, any goto out
916 * is used for a killable error condition */
920 scmd_printk(KERN_INFO
, SCpnt
,
921 "%s: block=%llu, count=%d\n",
922 __func__
, (unsigned long long)block
, this_count
));
924 if (!sdp
|| !scsi_device_online(sdp
) ||
925 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
926 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
927 "Finishing %u sectors\n",
928 blk_rq_sectors(rq
)));
929 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
930 "Retry with 0x%p\n", SCpnt
));
936 * quietly refuse to do anything to a changed disc until
937 * the changed bit has been reset
939 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
944 * Some SD card readers can't handle multi-sector accesses which touch
945 * the last one or two hardware sectors. Split accesses as needed.
947 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
948 (sdp
->sector_size
/ 512);
950 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
951 if (block
< threshold
) {
952 /* Access up to the threshold but not beyond */
953 this_count
= threshold
- block
;
955 /* Access only a single hardware sector */
956 this_count
= sdp
->sector_size
/ 512;
960 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
961 (unsigned long long)block
));
964 * If we have a 1K hardware sectorsize, prevent access to single
965 * 512 byte sectors. In theory we could handle this - in fact
966 * the scsi cdrom driver must be able to handle this because
967 * we typically use 1K blocksizes, and cdroms typically have
968 * 2K hardware sectorsizes. Of course, things are simpler
969 * with the cdrom, since it is read-only. For performance
970 * reasons, the filesystems should be able to handle this
971 * and not force the scsi disk driver to use bounce buffers
974 if (sdp
->sector_size
== 1024) {
975 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
976 scmd_printk(KERN_ERR
, SCpnt
,
977 "Bad block number requested\n");
981 this_count
= this_count
>> 1;
984 if (sdp
->sector_size
== 2048) {
985 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
986 scmd_printk(KERN_ERR
, SCpnt
,
987 "Bad block number requested\n");
991 this_count
= this_count
>> 2;
994 if (sdp
->sector_size
== 4096) {
995 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
996 scmd_printk(KERN_ERR
, SCpnt
,
997 "Bad block number requested\n");
1001 this_count
= this_count
>> 3;
1004 if (rq_data_dir(rq
) == WRITE
) {
1005 SCpnt
->cmnd
[0] = WRITE_6
;
1007 if (blk_integrity_rq(rq
))
1008 sd_dif_prepare(SCpnt
);
1010 } else if (rq_data_dir(rq
) == READ
) {
1011 SCpnt
->cmnd
[0] = READ_6
;
1013 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %d\n", req_op(rq
));
1017 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
1018 "%s %d/%u 512 byte blocks.\n",
1019 (rq_data_dir(rq
) == WRITE
) ?
1020 "writing" : "reading", this_count
,
1021 blk_rq_sectors(rq
)));
1023 dix
= scsi_prot_sg_count(SCpnt
);
1024 dif
= scsi_host_dif_capable(SCpnt
->device
->host
, sdkp
->protection_type
);
1027 protect
= sd_setup_protect_cmnd(SCpnt
, dix
, dif
);
1031 if (protect
&& sdkp
->protection_type
== T10_PI_TYPE2_PROTECTION
) {
1032 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1034 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1035 ret
= BLKPREP_DEFER
;
1039 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1040 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1041 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1042 SCpnt
->cmnd
[7] = 0x18;
1043 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1044 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1047 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1048 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1049 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1050 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1051 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1052 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1053 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1054 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1056 /* Expected Indirect LBA */
1057 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1058 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1059 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1060 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1062 /* Transfer length */
1063 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1064 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1065 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1066 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1067 } else if (sdp
->use_16_for_rw
|| (this_count
> 0xffff)) {
1068 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1069 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1070 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1071 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1072 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1073 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1074 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1075 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1076 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1077 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1078 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1079 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1080 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1081 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1082 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1083 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1084 scsi_device_protection(SCpnt
->device
) ||
1085 SCpnt
->device
->use_10_for_rw
) {
1086 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1087 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1088 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1089 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1090 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1091 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1092 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1093 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1094 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1096 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1098 * This happens only if this drive failed
1099 * 10byte rw command with ILLEGAL_REQUEST
1100 * during operation and thus turned off
1103 scmd_printk(KERN_ERR
, SCpnt
,
1104 "FUA write on READ/WRITE(6) drive\n");
1108 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1109 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1110 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1111 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1114 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1117 * We shouldn't disconnect in the middle of a sector, so with a dumb
1118 * host adapter, it's safe to assume that we can at least transfer
1119 * this many bytes between each connect / disconnect.
1121 SCpnt
->transfersize
= sdp
->sector_size
;
1122 SCpnt
->underflow
= this_count
<< 9;
1123 SCpnt
->allowed
= SD_MAX_RETRIES
;
1126 * This indicates that the command is ready from our end to be
1131 if (zoned_write
&& ret
!= BLKPREP_OK
)
1132 sd_zbc_cancel_write_cmnd(SCpnt
);
1137 static int sd_init_command(struct scsi_cmnd
*cmd
)
1139 struct request
*rq
= cmd
->request
;
1141 switch (req_op(rq
)) {
1142 case REQ_OP_DISCARD
:
1143 return sd_setup_discard_cmnd(cmd
);
1144 case REQ_OP_WRITE_SAME
:
1145 return sd_setup_write_same_cmnd(cmd
);
1147 return sd_setup_flush_cmnd(cmd
);
1150 return sd_setup_read_write_cmnd(cmd
);
1151 case REQ_OP_ZONE_REPORT
:
1152 return sd_zbc_setup_report_cmnd(cmd
);
1153 case REQ_OP_ZONE_RESET
:
1154 return sd_zbc_setup_reset_cmnd(cmd
);
1160 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
)
1162 struct request
*rq
= SCpnt
->request
;
1164 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1165 __free_page(rq
->special_vec
.bv_page
);
1167 if (SCpnt
->cmnd
!= scsi_req(rq
)->cmd
) {
1168 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1175 * sd_open - open a scsi disk device
1176 * @inode: only i_rdev member may be used
1177 * @filp: only f_mode and f_flags may be used
1179 * Returns 0 if successful. Returns a negated errno value in case
1182 * Note: This can be called from a user context (e.g. fsck(1) )
1183 * or from within the kernel (e.g. as a result of a mount(1) ).
1184 * In the latter case @inode and @filp carry an abridged amount
1185 * of information as noted above.
1187 * Locking: called with bdev->bd_mutex held.
1189 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1191 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1192 struct scsi_device
*sdev
;
1198 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1200 sdev
= sdkp
->device
;
1203 * If the device is in error recovery, wait until it is done.
1204 * If the device is offline, then disallow any access to it.
1207 if (!scsi_block_when_processing_errors(sdev
))
1210 if (sdev
->removable
|| sdkp
->write_prot
)
1211 check_disk_change(bdev
);
1214 * If the drive is empty, just let the open fail.
1216 retval
= -ENOMEDIUM
;
1217 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1221 * If the device has the write protect tab set, have the open fail
1222 * if the user expects to be able to write to the thing.
1225 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1229 * It is possible that the disk changing stuff resulted in
1230 * the device being taken offline. If this is the case,
1231 * report this to the user, and don't pretend that the
1232 * open actually succeeded.
1235 if (!scsi_device_online(sdev
))
1238 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1239 if (scsi_block_when_processing_errors(sdev
))
1240 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1246 scsi_disk_put(sdkp
);
1251 * sd_release - invoked when the (last) close(2) is called on this
1253 * @inode: only i_rdev member may be used
1254 * @filp: only f_mode and f_flags may be used
1258 * Note: may block (uninterruptible) if error recovery is underway
1261 * Locking: called with bdev->bd_mutex held.
1263 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1265 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1266 struct scsi_device
*sdev
= sdkp
->device
;
1268 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1270 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1271 if (scsi_block_when_processing_errors(sdev
))
1272 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1276 * XXX and what if there are packets in flight and this close()
1277 * XXX is followed by a "rmmod sd_mod"?
1280 scsi_disk_put(sdkp
);
1283 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1285 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1286 struct scsi_device
*sdp
= sdkp
->device
;
1287 struct Scsi_Host
*host
= sdp
->host
;
1288 sector_t capacity
= logical_to_sectors(sdp
, sdkp
->capacity
);
1291 /* default to most commonly used values */
1292 diskinfo
[0] = 0x40; /* 1 << 6 */
1293 diskinfo
[1] = 0x20; /* 1 << 5 */
1294 diskinfo
[2] = capacity
>> 11;
1296 /* override with calculated, extended default, or driver values */
1297 if (host
->hostt
->bios_param
)
1298 host
->hostt
->bios_param(sdp
, bdev
, capacity
, diskinfo
);
1300 scsicam_bios_param(bdev
, capacity
, diskinfo
);
1302 geo
->heads
= diskinfo
[0];
1303 geo
->sectors
= diskinfo
[1];
1304 geo
->cylinders
= diskinfo
[2];
1309 * sd_ioctl - process an ioctl
1310 * @inode: only i_rdev/i_bdev members may be used
1311 * @filp: only f_mode and f_flags may be used
1312 * @cmd: ioctl command number
1313 * @arg: this is third argument given to ioctl(2) system call.
1314 * Often contains a pointer.
1316 * Returns 0 if successful (some ioctls return positive numbers on
1317 * success as well). Returns a negated errno value in case of error.
1319 * Note: most ioctls are forward onto the block subsystem or further
1320 * down in the scsi subsystem.
1322 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1323 unsigned int cmd
, unsigned long arg
)
1325 struct gendisk
*disk
= bdev
->bd_disk
;
1326 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1327 struct scsi_device
*sdp
= sdkp
->device
;
1328 void __user
*p
= (void __user
*)arg
;
1331 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1332 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1334 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1339 * If we are in the middle of error recovery, don't let anyone
1340 * else try and use this device. Also, if error recovery fails, it
1341 * may try and take the device offline, in which case all further
1342 * access to the device is prohibited.
1344 error
= scsi_ioctl_block_when_processing_errors(sdp
, cmd
,
1345 (mode
& FMODE_NDELAY
) != 0);
1350 * Send SCSI addressing ioctls directly to mid level, send other
1351 * ioctls to block level and then onto mid level if they can't be
1355 case SCSI_IOCTL_GET_IDLUN
:
1356 case SCSI_IOCTL_GET_BUS_NUMBER
:
1357 error
= scsi_ioctl(sdp
, cmd
, p
);
1360 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1361 if (error
!= -ENOTTY
)
1363 error
= scsi_ioctl(sdp
, cmd
, p
);
1370 static void set_media_not_present(struct scsi_disk
*sdkp
)
1372 if (sdkp
->media_present
)
1373 sdkp
->device
->changed
= 1;
1375 if (sdkp
->device
->removable
) {
1376 sdkp
->media_present
= 0;
1381 static int media_not_present(struct scsi_disk
*sdkp
,
1382 struct scsi_sense_hdr
*sshdr
)
1384 if (!scsi_sense_valid(sshdr
))
1387 /* not invoked for commands that could return deferred errors */
1388 switch (sshdr
->sense_key
) {
1389 case UNIT_ATTENTION
:
1391 /* medium not present */
1392 if (sshdr
->asc
== 0x3A) {
1393 set_media_not_present(sdkp
);
1401 * sd_check_events - check media events
1402 * @disk: kernel device descriptor
1403 * @clearing: disk events currently being cleared
1405 * Returns mask of DISK_EVENT_*.
1407 * Note: this function is invoked from the block subsystem.
1409 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1411 struct scsi_disk
*sdkp
= scsi_disk_get(disk
);
1412 struct scsi_device
*sdp
;
1413 struct scsi_sense_hdr
*sshdr
= NULL
;
1420 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1423 * If the device is offline, don't send any commands - just pretend as
1424 * if the command failed. If the device ever comes back online, we
1425 * can deal with it then. It is only because of unrecoverable errors
1426 * that we would ever take a device offline in the first place.
1428 if (!scsi_device_online(sdp
)) {
1429 set_media_not_present(sdkp
);
1434 * Using TEST_UNIT_READY enables differentiation between drive with
1435 * no cartridge loaded - NOT READY, drive with changed cartridge -
1436 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1438 * Drives that auto spin down. eg iomega jaz 1G, will be started
1439 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1440 * sd_revalidate() is called.
1444 if (scsi_block_when_processing_errors(sdp
)) {
1445 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1446 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1450 /* failed to execute TUR, assume media not present */
1451 if (host_byte(retval
)) {
1452 set_media_not_present(sdkp
);
1456 if (media_not_present(sdkp
, sshdr
))
1460 * For removable scsi disk we have to recognise the presence
1461 * of a disk in the drive.
1463 if (!sdkp
->media_present
)
1465 sdkp
->media_present
= 1;
1468 * sdp->changed is set under the following conditions:
1470 * Medium present state has changed in either direction.
1471 * Device has indicated UNIT_ATTENTION.
1474 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1476 scsi_disk_put(sdkp
);
1480 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1483 struct scsi_device
*sdp
= sdkp
->device
;
1484 const int timeout
= sdp
->request_queue
->rq_timeout
1485 * SD_FLUSH_TIMEOUT_MULTIPLIER
;
1486 struct scsi_sense_hdr sshdr
;
1488 if (!scsi_device_online(sdp
))
1491 for (retries
= 3; retries
> 0; --retries
) {
1492 unsigned char cmd
[10] = { 0 };
1494 cmd
[0] = SYNCHRONIZE_CACHE
;
1496 * Leave the rest of the command zero to indicate
1499 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1500 &sshdr
, timeout
, SD_MAX_RETRIES
,
1507 sd_print_result(sdkp
, "Synchronize Cache(10) failed", res
);
1509 if (driver_byte(res
) & DRIVER_SENSE
)
1510 sd_print_sense_hdr(sdkp
, &sshdr
);
1511 /* we need to evaluate the error return */
1512 if (scsi_sense_valid(&sshdr
) &&
1513 (sshdr
.asc
== 0x3a || /* medium not present */
1514 sshdr
.asc
== 0x20)) /* invalid command */
1515 /* this is no error here */
1518 switch (host_byte(res
)) {
1519 /* ignore errors due to racing a disconnection */
1520 case DID_BAD_TARGET
:
1521 case DID_NO_CONNECT
:
1523 /* signal the upper layer it might try again */
1527 case DID_SOFT_ERROR
:
1536 static void sd_rescan(struct device
*dev
)
1538 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1540 revalidate_disk(sdkp
->disk
);
1544 #ifdef CONFIG_COMPAT
1546 * This gets directly called from VFS. When the ioctl
1547 * is not recognized we go back to the other translation paths.
1549 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1550 unsigned int cmd
, unsigned long arg
)
1552 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1555 error
= scsi_ioctl_block_when_processing_errors(sdev
, cmd
,
1556 (mode
& FMODE_NDELAY
) != 0);
1561 * Let the static ioctl translation table take care of it.
1563 if (!sdev
->host
->hostt
->compat_ioctl
)
1564 return -ENOIOCTLCMD
;
1565 return sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1569 static char sd_pr_type(enum pr_type type
)
1572 case PR_WRITE_EXCLUSIVE
:
1574 case PR_EXCLUSIVE_ACCESS
:
1576 case PR_WRITE_EXCLUSIVE_REG_ONLY
:
1578 case PR_EXCLUSIVE_ACCESS_REG_ONLY
:
1580 case PR_WRITE_EXCLUSIVE_ALL_REGS
:
1582 case PR_EXCLUSIVE_ACCESS_ALL_REGS
:
1589 static int sd_pr_command(struct block_device
*bdev
, u8 sa
,
1590 u64 key
, u64 sa_key
, u8 type
, u8 flags
)
1592 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1593 struct scsi_sense_hdr sshdr
;
1595 u8 cmd
[16] = { 0, };
1596 u8 data
[24] = { 0, };
1598 cmd
[0] = PERSISTENT_RESERVE_OUT
;
1601 put_unaligned_be32(sizeof(data
), &cmd
[5]);
1603 put_unaligned_be64(key
, &data
[0]);
1604 put_unaligned_be64(sa_key
, &data
[8]);
1607 result
= scsi_execute_req(sdev
, cmd
, DMA_TO_DEVICE
, &data
, sizeof(data
),
1608 &sshdr
, SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1610 if ((driver_byte(result
) & DRIVER_SENSE
) &&
1611 (scsi_sense_valid(&sshdr
))) {
1612 sdev_printk(KERN_INFO
, sdev
, "PR command failed: %d\n", result
);
1613 scsi_print_sense_hdr(sdev
, NULL
, &sshdr
);
1619 static int sd_pr_register(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1622 if (flags
& ~PR_FL_IGNORE_KEY
)
1624 return sd_pr_command(bdev
, (flags
& PR_FL_IGNORE_KEY
) ? 0x06 : 0x00,
1625 old_key
, new_key
, 0,
1626 (1 << 0) /* APTPL */);
1629 static int sd_pr_reserve(struct block_device
*bdev
, u64 key
, enum pr_type type
,
1634 return sd_pr_command(bdev
, 0x01, key
, 0, sd_pr_type(type
), 0);
1637 static int sd_pr_release(struct block_device
*bdev
, u64 key
, enum pr_type type
)
1639 return sd_pr_command(bdev
, 0x02, key
, 0, sd_pr_type(type
), 0);
1642 static int sd_pr_preempt(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1643 enum pr_type type
, bool abort
)
1645 return sd_pr_command(bdev
, abort
? 0x05 : 0x04, old_key
, new_key
,
1646 sd_pr_type(type
), 0);
1649 static int sd_pr_clear(struct block_device
*bdev
, u64 key
)
1651 return sd_pr_command(bdev
, 0x03, key
, 0, 0, 0);
1654 static const struct pr_ops sd_pr_ops
= {
1655 .pr_register
= sd_pr_register
,
1656 .pr_reserve
= sd_pr_reserve
,
1657 .pr_release
= sd_pr_release
,
1658 .pr_preempt
= sd_pr_preempt
,
1659 .pr_clear
= sd_pr_clear
,
1662 static const struct block_device_operations sd_fops
= {
1663 .owner
= THIS_MODULE
,
1665 .release
= sd_release
,
1667 .getgeo
= sd_getgeo
,
1668 #ifdef CONFIG_COMPAT
1669 .compat_ioctl
= sd_compat_ioctl
,
1671 .check_events
= sd_check_events
,
1672 .revalidate_disk
= sd_revalidate_disk
,
1673 .unlock_native_capacity
= sd_unlock_native_capacity
,
1674 .pr_ops
= &sd_pr_ops
,
1678 * sd_eh_action - error handling callback
1679 * @scmd: sd-issued command that has failed
1680 * @eh_disp: The recovery disposition suggested by the midlayer
1682 * This function is called by the SCSI midlayer upon completion of an
1683 * error test command (currently TEST UNIT READY). The result of sending
1684 * the eh command is passed in eh_disp. We're looking for devices that
1685 * fail medium access commands but are OK with non access commands like
1686 * test unit ready (so wrongly see the device as having a successful
1689 static int sd_eh_action(struct scsi_cmnd
*scmd
, int eh_disp
)
1691 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1693 if (!scsi_device_online(scmd
->device
) ||
1694 !scsi_medium_access_command(scmd
) ||
1695 host_byte(scmd
->result
) != DID_TIME_OUT
||
1700 * The device has timed out executing a medium access command.
1701 * However, the TEST UNIT READY command sent during error
1702 * handling completed successfully. Either the device is in the
1703 * process of recovering or has it suffered an internal failure
1704 * that prevents access to the storage medium.
1706 sdkp
->medium_access_timed_out
++;
1709 * If the device keeps failing read/write commands but TEST UNIT
1710 * READY always completes successfully we assume that medium
1711 * access is no longer possible and take the device offline.
1713 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1714 scmd_printk(KERN_ERR
, scmd
,
1715 "Medium access timeout failure. Offlining disk!\n");
1716 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1724 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1726 u64 start_lba
= blk_rq_pos(scmd
->request
);
1727 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1728 u64 factor
= scmd
->device
->sector_size
/ 512;
1732 * resid is optional but mostly filled in. When it's unused,
1733 * its value is zero, so we assume the whole buffer transferred
1735 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1736 unsigned int good_bytes
;
1738 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1741 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1742 SCSI_SENSE_BUFFERSIZE
,
1747 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1750 /* be careful ... don't want any overflows */
1751 do_div(start_lba
, factor
);
1752 do_div(end_lba
, factor
);
1754 /* The bad lba was reported incorrectly, we have no idea where
1757 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1760 /* This computation should always be done in terms of
1761 * the resolution of the device's medium.
1763 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1764 return min(good_bytes
, transferred
);
1768 * sd_done - bottom half handler: called when the lower level
1769 * driver has completed (successfully or otherwise) a scsi command.
1770 * @SCpnt: mid-level's per command structure.
1772 * Note: potentially run from within an ISR. Must not block.
1774 static int sd_done(struct scsi_cmnd
*SCpnt
)
1776 int result
= SCpnt
->result
;
1777 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1778 struct scsi_sense_hdr sshdr
;
1779 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1780 struct request
*req
= SCpnt
->request
;
1781 int sense_valid
= 0;
1782 int sense_deferred
= 0;
1783 unsigned char op
= SCpnt
->cmnd
[0];
1784 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1786 switch (req_op(req
)) {
1787 case REQ_OP_DISCARD
:
1788 case REQ_OP_WRITE_SAME
:
1789 case REQ_OP_ZONE_RESET
:
1791 good_bytes
= blk_rq_bytes(req
);
1792 scsi_set_resid(SCpnt
, 0);
1795 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1798 case REQ_OP_ZONE_REPORT
:
1800 good_bytes
= scsi_bufflen(SCpnt
)
1801 - scsi_get_resid(SCpnt
);
1802 scsi_set_resid(SCpnt
, 0);
1805 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1811 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1813 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1815 sdkp
->medium_access_timed_out
= 0;
1817 if (driver_byte(result
) != DRIVER_SENSE
&&
1818 (!sense_valid
|| sense_deferred
))
1821 switch (sshdr
.sense_key
) {
1822 case HARDWARE_ERROR
:
1824 good_bytes
= sd_completed_bytes(SCpnt
);
1826 case RECOVERED_ERROR
:
1827 good_bytes
= scsi_bufflen(SCpnt
);
1830 /* This indicates a false check condition, so ignore it. An
1831 * unknown amount of data was transferred so treat it as an
1835 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1837 case ABORTED_COMMAND
:
1838 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1839 good_bytes
= sd_completed_bytes(SCpnt
);
1841 case ILLEGAL_REQUEST
:
1842 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1843 good_bytes
= sd_completed_bytes(SCpnt
);
1844 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1845 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1848 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1853 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1855 sdkp
->device
->no_write_same
= 1;
1856 sd_config_write_same(sdkp
);
1859 req
->__data_len
= blk_rq_bytes(req
);
1860 req
->rq_flags
|= RQF_QUIET
;
1870 if (sd_is_zoned(sdkp
))
1871 sd_zbc_complete(SCpnt
, good_bytes
, &sshdr
);
1873 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1874 "sd_done: completed %d of %d bytes\n",
1875 good_bytes
, scsi_bufflen(SCpnt
)));
1877 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1878 sd_dif_complete(SCpnt
, good_bytes
);
1884 * spinup disk - called only in sd_revalidate_disk()
1887 sd_spinup_disk(struct scsi_disk
*sdkp
)
1889 unsigned char cmd
[10];
1890 unsigned long spintime_expire
= 0;
1891 int retries
, spintime
;
1892 unsigned int the_result
;
1893 struct scsi_sense_hdr sshdr
;
1894 int sense_valid
= 0;
1898 /* Spin up drives, as required. Only do this at boot time */
1899 /* Spinup needs to be done for module loads too. */
1904 cmd
[0] = TEST_UNIT_READY
;
1905 memset((void *) &cmd
[1], 0, 9);
1907 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1910 SD_MAX_RETRIES
, NULL
);
1913 * If the drive has indicated to us that it
1914 * doesn't have any media in it, don't bother
1915 * with any more polling.
1917 if (media_not_present(sdkp
, &sshdr
))
1921 sense_valid
= scsi_sense_valid(&sshdr
);
1923 } while (retries
< 3 &&
1924 (!scsi_status_is_good(the_result
) ||
1925 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1926 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1928 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1929 /* no sense, TUR either succeeded or failed
1930 * with a status error */
1931 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1932 sd_print_result(sdkp
, "Test Unit Ready failed",
1939 * The device does not want the automatic start to be issued.
1941 if (sdkp
->device
->no_start_on_add
)
1944 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1945 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1946 break; /* manual intervention required */
1947 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1948 break; /* standby */
1949 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1950 break; /* unavailable */
1952 * Issue command to spin up drive when not ready
1955 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1956 cmd
[0] = START_STOP
;
1957 cmd
[1] = 1; /* Return immediately */
1958 memset((void *) &cmd
[2], 0, 8);
1959 cmd
[4] = 1; /* Start spin cycle */
1960 if (sdkp
->device
->start_stop_pwr_cond
)
1962 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1964 SD_TIMEOUT
, SD_MAX_RETRIES
,
1966 spintime_expire
= jiffies
+ 100 * HZ
;
1969 /* Wait 1 second for next try */
1974 * Wait for USB flash devices with slow firmware.
1975 * Yes, this sense key/ASC combination shouldn't
1976 * occur here. It's characteristic of these devices.
1978 } else if (sense_valid
&&
1979 sshdr
.sense_key
== UNIT_ATTENTION
&&
1980 sshdr
.asc
== 0x28) {
1982 spintime_expire
= jiffies
+ 5 * HZ
;
1985 /* Wait 1 second for next try */
1988 /* we don't understand the sense code, so it's
1989 * probably pointless to loop */
1991 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1992 sd_print_sense_hdr(sdkp
, &sshdr
);
1997 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
2000 if (scsi_status_is_good(the_result
))
2003 printk("not responding...\n");
2008 * Determine whether disk supports Data Integrity Field.
2010 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2012 struct scsi_device
*sdp
= sdkp
->device
;
2016 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
2019 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2021 if (type
> T10_PI_TYPE3_PROTECTION
)
2023 else if (scsi_host_dif_capable(sdp
->host
, type
))
2026 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
2029 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
2030 " protection type %u. Disabling disk!\n",
2034 sd_printk(KERN_NOTICE
, sdkp
,
2035 "Enabling DIF Type %u protection\n", type
);
2038 sd_printk(KERN_NOTICE
, sdkp
,
2039 "Disabling DIF Type %u protection\n", type
);
2043 sdkp
->protection_type
= type
;
2048 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2049 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
2052 if (driver_byte(the_result
) & DRIVER_SENSE
)
2053 sd_print_sense_hdr(sdkp
, sshdr
);
2055 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
2058 * Set dirty bit for removable devices if not ready -
2059 * sometimes drives will not report this properly.
2061 if (sdp
->removable
&&
2062 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
2063 set_media_not_present(sdkp
);
2066 * We used to set media_present to 0 here to indicate no media
2067 * in the drive, but some drives fail read capacity even with
2068 * media present, so we can't do that.
2070 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
2074 #if RC16_LEN > SD_BUF_SIZE
2075 #error RC16_LEN must not be more than SD_BUF_SIZE
2078 #define READ_CAPACITY_RETRIES_ON_RESET 10
2080 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2081 unsigned char *buffer
)
2083 unsigned char cmd
[16];
2084 struct scsi_sense_hdr sshdr
;
2085 int sense_valid
= 0;
2087 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2088 unsigned int alignment
;
2089 unsigned long long lba
;
2090 unsigned sector_size
;
2092 if (sdp
->no_read_capacity_16
)
2097 cmd
[0] = SERVICE_ACTION_IN_16
;
2098 cmd
[1] = SAI_READ_CAPACITY_16
;
2100 memset(buffer
, 0, RC16_LEN
);
2102 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2103 buffer
, RC16_LEN
, &sshdr
,
2104 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2106 if (media_not_present(sdkp
, &sshdr
))
2110 sense_valid
= scsi_sense_valid(&sshdr
);
2112 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2113 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
2115 /* Invalid Command Operation Code or
2116 * Invalid Field in CDB, just retry
2117 * silently with RC10 */
2120 sshdr
.sense_key
== UNIT_ATTENTION
&&
2121 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2122 /* Device reset might occur several times,
2123 * give it one more chance */
2124 if (--reset_retries
> 0)
2129 } while (the_result
&& retries
);
2132 sd_print_result(sdkp
, "Read Capacity(16) failed", the_result
);
2133 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2137 sector_size
= get_unaligned_be32(&buffer
[8]);
2138 lba
= get_unaligned_be64(&buffer
[0]);
2140 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
2145 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
2146 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2147 "kernel compiled with support for large block "
2153 /* Logical blocks per physical block exponent */
2154 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2157 sdkp
->rc_basis
= (buffer
[12] >> 4) & 0x3;
2159 /* Lowest aligned logical block */
2160 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2161 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2162 if (alignment
&& sdkp
->first_scan
)
2163 sd_printk(KERN_NOTICE
, sdkp
,
2164 "physical block alignment offset: %u\n", alignment
);
2166 if (buffer
[14] & 0x80) { /* LBPME */
2169 if (buffer
[14] & 0x40) /* LBPRZ */
2172 sd_config_discard(sdkp
, SD_LBP_WS16
);
2175 sdkp
->capacity
= lba
+ 1;
2179 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2180 unsigned char *buffer
)
2182 unsigned char cmd
[16];
2183 struct scsi_sense_hdr sshdr
;
2184 int sense_valid
= 0;
2186 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2188 unsigned sector_size
;
2191 cmd
[0] = READ_CAPACITY
;
2192 memset(&cmd
[1], 0, 9);
2193 memset(buffer
, 0, 8);
2195 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2197 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2199 if (media_not_present(sdkp
, &sshdr
))
2203 sense_valid
= scsi_sense_valid(&sshdr
);
2205 sshdr
.sense_key
== UNIT_ATTENTION
&&
2206 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2207 /* Device reset might occur several times,
2208 * give it one more chance */
2209 if (--reset_retries
> 0)
2214 } while (the_result
&& retries
);
2217 sd_print_result(sdkp
, "Read Capacity(10) failed", the_result
);
2218 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2222 sector_size
= get_unaligned_be32(&buffer
[4]);
2223 lba
= get_unaligned_be32(&buffer
[0]);
2225 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2226 /* Some buggy (usb cardreader) devices return an lba of
2227 0xffffffff when the want to report a size of 0 (with
2228 which they really mean no media is present) */
2230 sdkp
->physical_block_size
= sector_size
;
2234 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2235 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2236 "kernel compiled with support for large block "
2242 sdkp
->capacity
= lba
+ 1;
2243 sdkp
->physical_block_size
= sector_size
;
2247 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2249 if (sdp
->host
->max_cmd_len
< 16)
2251 if (sdp
->try_rc_10_first
)
2253 if (sdp
->scsi_level
> SCSI_SPC_2
)
2255 if (scsi_device_protection(sdp
))
2261 * read disk capacity
2264 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2267 struct scsi_device
*sdp
= sdkp
->device
;
2269 if (sd_try_rc16_first(sdp
)) {
2270 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2271 if (sector_size
== -EOVERFLOW
)
2273 if (sector_size
== -ENODEV
)
2275 if (sector_size
< 0)
2276 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2277 if (sector_size
< 0)
2280 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2281 if (sector_size
== -EOVERFLOW
)
2283 if (sector_size
< 0)
2285 if ((sizeof(sdkp
->capacity
) > 4) &&
2286 (sdkp
->capacity
> 0xffffffffULL
)) {
2287 int old_sector_size
= sector_size
;
2288 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2289 "Trying to use READ CAPACITY(16).\n");
2290 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2291 if (sector_size
< 0) {
2292 sd_printk(KERN_NOTICE
, sdkp
,
2293 "Using 0xffffffff as device size\n");
2294 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2295 sector_size
= old_sector_size
;
2301 /* Some devices are known to return the total number of blocks,
2302 * not the highest block number. Some devices have versions
2303 * which do this and others which do not. Some devices we might
2304 * suspect of doing this but we don't know for certain.
2306 * If we know the reported capacity is wrong, decrement it. If
2307 * we can only guess, then assume the number of blocks is even
2308 * (usually true but not always) and err on the side of lowering
2311 if (sdp
->fix_capacity
||
2312 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2313 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2314 "from its reported value: %llu\n",
2315 (unsigned long long) sdkp
->capacity
);
2320 if (sector_size
== 0) {
2322 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2326 if (sector_size
!= 512 &&
2327 sector_size
!= 1024 &&
2328 sector_size
!= 2048 &&
2329 sector_size
!= 4096) {
2330 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2333 * The user might want to re-format the drive with
2334 * a supported sectorsize. Once this happens, it
2335 * would be relatively trivial to set the thing up.
2336 * For this reason, we leave the thing in the table.
2340 * set a bogus sector size so the normal read/write
2341 * logic in the block layer will eventually refuse any
2342 * request on this device without tripping over power
2343 * of two sector size assumptions
2347 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2348 blk_queue_physical_block_size(sdp
->request_queue
,
2349 sdkp
->physical_block_size
);
2350 sdkp
->device
->sector_size
= sector_size
;
2352 if (sdkp
->capacity
> 0xffffffff)
2353 sdp
->use_16_for_rw
= 1;
2358 * Print disk capacity
2361 sd_print_capacity(struct scsi_disk
*sdkp
,
2362 sector_t old_capacity
)
2364 int sector_size
= sdkp
->device
->sector_size
;
2365 char cap_str_2
[10], cap_str_10
[10];
2367 string_get_size(sdkp
->capacity
, sector_size
,
2368 STRING_UNITS_2
, cap_str_2
, sizeof(cap_str_2
));
2369 string_get_size(sdkp
->capacity
, sector_size
,
2370 STRING_UNITS_10
, cap_str_10
,
2371 sizeof(cap_str_10
));
2373 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2374 sd_printk(KERN_NOTICE
, sdkp
,
2375 "%llu %d-byte logical blocks: (%s/%s)\n",
2376 (unsigned long long)sdkp
->capacity
,
2377 sector_size
, cap_str_10
, cap_str_2
);
2379 if (sdkp
->physical_block_size
!= sector_size
)
2380 sd_printk(KERN_NOTICE
, sdkp
,
2381 "%u-byte physical blocks\n",
2382 sdkp
->physical_block_size
);
2384 sd_zbc_print_zones(sdkp
);
2388 /* called with buffer of length 512 */
2390 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2391 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2392 struct scsi_sense_hdr
*sshdr
)
2394 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2395 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2400 * read write protect setting, if possible - called only in sd_revalidate_disk()
2401 * called with buffer of length SD_BUF_SIZE
2404 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2407 struct scsi_device
*sdp
= sdkp
->device
;
2408 struct scsi_mode_data data
;
2409 int old_wp
= sdkp
->write_prot
;
2411 set_disk_ro(sdkp
->disk
, 0);
2412 if (sdp
->skip_ms_page_3f
) {
2413 sd_first_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2417 if (sdp
->use_192_bytes_for_3f
) {
2418 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2421 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2422 * We have to start carefully: some devices hang if we ask
2423 * for more than is available.
2425 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2428 * Second attempt: ask for page 0 When only page 0 is
2429 * implemented, a request for page 3F may return Sense Key
2430 * 5: Illegal Request, Sense Code 24: Invalid field in
2433 if (!scsi_status_is_good(res
))
2434 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2437 * Third attempt: ask 255 bytes, as we did earlier.
2439 if (!scsi_status_is_good(res
))
2440 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2444 if (!scsi_status_is_good(res
)) {
2445 sd_first_printk(KERN_WARNING
, sdkp
,
2446 "Test WP failed, assume Write Enabled\n");
2448 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2449 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2450 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2451 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2452 sdkp
->write_prot
? "on" : "off");
2453 sd_printk(KERN_DEBUG
, sdkp
, "Mode Sense: %4ph\n", buffer
);
2459 * sd_read_cache_type - called only from sd_revalidate_disk()
2460 * called with buffer of length SD_BUF_SIZE
2463 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2466 struct scsi_device
*sdp
= sdkp
->device
;
2471 struct scsi_mode_data data
;
2472 struct scsi_sense_hdr sshdr
;
2473 int old_wce
= sdkp
->WCE
;
2474 int old_rcd
= sdkp
->RCD
;
2475 int old_dpofua
= sdkp
->DPOFUA
;
2478 if (sdkp
->cache_override
)
2482 if (sdp
->skip_ms_page_8
) {
2483 if (sdp
->type
== TYPE_RBC
)
2486 if (sdp
->skip_ms_page_3f
)
2489 if (sdp
->use_192_bytes_for_3f
)
2493 } else if (sdp
->type
== TYPE_RBC
) {
2501 /* cautiously ask */
2502 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2505 if (!scsi_status_is_good(res
))
2508 if (!data
.header_length
) {
2511 sd_first_printk(KERN_ERR
, sdkp
,
2512 "Missing header in MODE_SENSE response\n");
2515 /* that went OK, now ask for the proper length */
2519 * We're only interested in the first three bytes, actually.
2520 * But the data cache page is defined for the first 20.
2524 else if (len
> SD_BUF_SIZE
) {
2525 sd_first_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2526 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2529 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2533 if (len
> first_len
)
2534 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2537 if (scsi_status_is_good(res
)) {
2538 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2540 while (offset
< len
) {
2541 u8 page_code
= buffer
[offset
] & 0x3F;
2542 u8 spf
= buffer
[offset
] & 0x40;
2544 if (page_code
== 8 || page_code
== 6) {
2545 /* We're interested only in the first 3 bytes.
2547 if (len
- offset
<= 2) {
2548 sd_first_printk(KERN_ERR
, sdkp
,
2549 "Incomplete mode parameter "
2553 modepage
= page_code
;
2557 /* Go to the next page */
2558 if (spf
&& len
- offset
> 3)
2559 offset
+= 4 + (buffer
[offset
+2] << 8) +
2561 else if (!spf
&& len
- offset
> 1)
2562 offset
+= 2 + buffer
[offset
+1];
2564 sd_first_printk(KERN_ERR
, sdkp
,
2566 "parameter data\n");
2572 sd_first_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2576 if (modepage
== 8) {
2577 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2578 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2580 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2584 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2585 if (sdp
->broken_fua
) {
2586 sd_first_printk(KERN_NOTICE
, sdkp
, "Disabling FUA\n");
2588 } else if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
&&
2589 !sdkp
->device
->use_16_for_rw
) {
2590 sd_first_printk(KERN_NOTICE
, sdkp
,
2591 "Uses READ/WRITE(6), disabling FUA\n");
2595 /* No cache flush allowed for write protected devices */
2596 if (sdkp
->WCE
&& sdkp
->write_prot
)
2599 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2600 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2601 sd_printk(KERN_NOTICE
, sdkp
,
2602 "Write cache: %s, read cache: %s, %s\n",
2603 sdkp
->WCE
? "enabled" : "disabled",
2604 sdkp
->RCD
? "disabled" : "enabled",
2605 sdkp
->DPOFUA
? "supports DPO and FUA"
2606 : "doesn't support DPO or FUA");
2612 if (scsi_sense_valid(&sshdr
) &&
2613 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2614 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2615 /* Invalid field in CDB */
2616 sd_first_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2618 sd_first_printk(KERN_ERR
, sdkp
,
2619 "Asking for cache data failed\n");
2622 if (sdp
->wce_default_on
) {
2623 sd_first_printk(KERN_NOTICE
, sdkp
,
2624 "Assuming drive cache: write back\n");
2627 sd_first_printk(KERN_ERR
, sdkp
,
2628 "Assuming drive cache: write through\n");
2636 * The ATO bit indicates whether the DIF application tag is available
2637 * for use by the operating system.
2639 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2642 struct scsi_device
*sdp
= sdkp
->device
;
2643 struct scsi_mode_data data
;
2644 struct scsi_sense_hdr sshdr
;
2646 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_ZBC
)
2649 if (sdkp
->protection_type
== 0)
2652 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2653 SD_MAX_RETRIES
, &data
, &sshdr
);
2655 if (!scsi_status_is_good(res
) || !data
.header_length
||
2657 sd_first_printk(KERN_WARNING
, sdkp
,
2658 "getting Control mode page failed, assume no ATO\n");
2660 if (scsi_sense_valid(&sshdr
))
2661 sd_print_sense_hdr(sdkp
, &sshdr
);
2666 offset
= data
.header_length
+ data
.block_descriptor_length
;
2668 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2669 sd_first_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2673 if ((buffer
[offset
+ 5] & 0x80) == 0)
2682 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2683 * @disk: disk to query
2685 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2687 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2688 const int vpd_len
= 64;
2689 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2692 /* Block Limits VPD */
2693 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2696 blk_queue_io_min(sdkp
->disk
->queue
,
2697 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2699 sdkp
->max_xfer_blocks
= get_unaligned_be32(&buffer
[8]);
2700 sdkp
->opt_xfer_blocks
= get_unaligned_be32(&buffer
[12]);
2702 if (buffer
[3] == 0x3c) {
2703 unsigned int lba_count
, desc_count
;
2705 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2710 lba_count
= get_unaligned_be32(&buffer
[20]);
2711 desc_count
= get_unaligned_be32(&buffer
[24]);
2713 if (lba_count
&& desc_count
)
2714 sdkp
->max_unmap_blocks
= lba_count
;
2716 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2718 if (buffer
[32] & 0x80)
2719 sdkp
->unmap_alignment
=
2720 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2722 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2724 if (sdkp
->max_unmap_blocks
)
2725 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2727 sd_config_discard(sdkp
, SD_LBP_WS16
);
2729 } else { /* LBP VPD page tells us what to use */
2730 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
&& !sdkp
->lbprz
)
2731 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2732 else if (sdkp
->lbpws
)
2733 sd_config_discard(sdkp
, SD_LBP_WS16
);
2734 else if (sdkp
->lbpws10
)
2735 sd_config_discard(sdkp
, SD_LBP_WS10
);
2736 else if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2737 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2739 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2748 * sd_read_block_characteristics - Query block dev. characteristics
2749 * @disk: disk to query
2751 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2753 struct request_queue
*q
= sdkp
->disk
->queue
;
2754 unsigned char *buffer
;
2756 const int vpd_len
= 64;
2758 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2761 /* Block Device Characteristics VPD */
2762 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2765 rot
= get_unaligned_be16(&buffer
[4]);
2768 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, q
);
2769 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM
, q
);
2772 if (sdkp
->device
->type
== TYPE_ZBC
) {
2774 q
->limits
.zoned
= BLK_ZONED_HM
;
2776 sdkp
->zoned
= (buffer
[8] >> 4) & 3;
2777 if (sdkp
->zoned
== 1)
2779 q
->limits
.zoned
= BLK_ZONED_HA
;
2782 * Treat drive-managed devices as
2783 * regular block devices.
2785 q
->limits
.zoned
= BLK_ZONED_NONE
;
2787 if (blk_queue_is_zoned(q
) && sdkp
->first_scan
)
2788 sd_printk(KERN_NOTICE
, sdkp
, "Host-%s zoned block device\n",
2789 q
->limits
.zoned
== BLK_ZONED_HM
? "managed" : "aware");
2796 * sd_read_block_provisioning - Query provisioning VPD page
2797 * @disk: disk to query
2799 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2801 unsigned char *buffer
;
2802 const int vpd_len
= 8;
2804 if (sdkp
->lbpme
== 0)
2807 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2809 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2813 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2814 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2815 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2821 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2823 struct scsi_device
*sdev
= sdkp
->device
;
2825 if (sdev
->host
->no_write_same
) {
2826 sdev
->no_write_same
= 1;
2831 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2832 /* too large values might cause issues with arcmsr */
2833 int vpd_buf_len
= 64;
2835 sdev
->no_report_opcodes
= 1;
2837 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2838 * CODES is unsupported and the device has an ATA
2839 * Information VPD page (SAT).
2841 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2842 sdev
->no_write_same
= 1;
2845 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2848 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2853 * sd_revalidate_disk - called the first time a new disk is seen,
2854 * performs disk spin up, read_capacity, etc.
2855 * @disk: struct gendisk we care about
2857 static int sd_revalidate_disk(struct gendisk
*disk
)
2859 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2860 struct scsi_device
*sdp
= sdkp
->device
;
2861 struct request_queue
*q
= sdkp
->disk
->queue
;
2862 sector_t old_capacity
= sdkp
->capacity
;
2863 unsigned char *buffer
;
2864 unsigned int dev_max
, rw_max
;
2866 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2867 "sd_revalidate_disk\n"));
2870 * If the device is offline, don't try and read capacity or any
2871 * of the other niceties.
2873 if (!scsi_device_online(sdp
))
2876 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2878 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2879 "allocation failure.\n");
2883 sd_spinup_disk(sdkp
);
2886 * Without media there is no reason to ask; moreover, some devices
2887 * react badly if we do.
2889 if (sdkp
->media_present
) {
2890 sd_read_capacity(sdkp
, buffer
);
2892 if (scsi_device_supports_vpd(sdp
)) {
2893 sd_read_block_provisioning(sdkp
);
2894 sd_read_block_limits(sdkp
);
2895 sd_read_block_characteristics(sdkp
);
2896 sd_zbc_read_zones(sdkp
, buffer
);
2899 sd_print_capacity(sdkp
, old_capacity
);
2901 sd_read_write_protect_flag(sdkp
, buffer
);
2902 sd_read_cache_type(sdkp
, buffer
);
2903 sd_read_app_tag_own(sdkp
, buffer
);
2904 sd_read_write_same(sdkp
, buffer
);
2907 sdkp
->first_scan
= 0;
2910 * We now have all cache related info, determine how we deal
2911 * with flush requests.
2913 sd_set_flush_flag(sdkp
);
2915 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2916 dev_max
= sdp
->use_16_for_rw
? SD_MAX_XFER_BLOCKS
: SD_DEF_XFER_BLOCKS
;
2918 /* Some devices report a maximum block count for READ/WRITE requests. */
2919 dev_max
= min_not_zero(dev_max
, sdkp
->max_xfer_blocks
);
2920 q
->limits
.max_dev_sectors
= logical_to_sectors(sdp
, dev_max
);
2923 * Use the device's preferred I/O size for reads and writes
2924 * unless the reported value is unreasonably small, large, or
2927 if (sdkp
->opt_xfer_blocks
&&
2928 sdkp
->opt_xfer_blocks
<= dev_max
&&
2929 sdkp
->opt_xfer_blocks
<= SD_DEF_XFER_BLOCKS
&&
2930 logical_to_bytes(sdp
, sdkp
->opt_xfer_blocks
) >= PAGE_SIZE
) {
2931 q
->limits
.io_opt
= logical_to_bytes(sdp
, sdkp
->opt_xfer_blocks
);
2932 rw_max
= logical_to_sectors(sdp
, sdkp
->opt_xfer_blocks
);
2934 rw_max
= BLK_DEF_MAX_SECTORS
;
2936 /* Combine with controller limits */
2937 q
->limits
.max_sectors
= min(rw_max
, queue_max_hw_sectors(q
));
2939 set_capacity(disk
, logical_to_sectors(sdp
, sdkp
->capacity
));
2940 sd_config_write_same(sdkp
);
2948 * sd_unlock_native_capacity - unlock native capacity
2949 * @disk: struct gendisk to set capacity for
2951 * Block layer calls this function if it detects that partitions
2952 * on @disk reach beyond the end of the device. If the SCSI host
2953 * implements ->unlock_native_capacity() method, it's invoked to
2954 * give it a chance to adjust the device capacity.
2957 * Defined by block layer. Might sleep.
2959 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2961 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2963 if (sdev
->host
->hostt
->unlock_native_capacity
)
2964 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2968 * sd_format_disk_name - format disk name
2969 * @prefix: name prefix - ie. "sd" for SCSI disks
2970 * @index: index of the disk to format name for
2971 * @buf: output buffer
2972 * @buflen: length of the output buffer
2974 * SCSI disk names starts at sda. The 26th device is sdz and the
2975 * 27th is sdaa. The last one for two lettered suffix is sdzz
2976 * which is followed by sdaaa.
2978 * This is basically 26 base counting with one extra 'nil' entry
2979 * at the beginning from the second digit on and can be
2980 * determined using similar method as 26 base conversion with the
2981 * index shifted -1 after each digit is computed.
2987 * 0 on success, -errno on failure.
2989 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2991 const int base
= 'z' - 'a' + 1;
2992 char *begin
= buf
+ strlen(prefix
);
2993 char *end
= buf
+ buflen
;
3003 *--p
= 'a' + (index
% unit
);
3004 index
= (index
/ unit
) - 1;
3005 } while (index
>= 0);
3007 memmove(begin
, p
, end
- p
);
3008 memcpy(buf
, prefix
, strlen(prefix
));
3014 * The asynchronous part of sd_probe
3016 static void sd_probe_async(void *data
, async_cookie_t cookie
)
3018 struct scsi_disk
*sdkp
= data
;
3019 struct scsi_device
*sdp
;
3026 index
= sdkp
->index
;
3027 dev
= &sdp
->sdev_gendev
;
3029 gd
->major
= sd_major((index
& 0xf0) >> 4);
3030 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
3031 gd
->minors
= SD_MINORS
;
3033 gd
->fops
= &sd_fops
;
3034 gd
->private_data
= &sdkp
->driver
;
3035 gd
->queue
= sdkp
->device
->request_queue
;
3037 /* defaults, until the device tells us otherwise */
3038 sdp
->sector_size
= 512;
3040 sdkp
->media_present
= 1;
3041 sdkp
->write_prot
= 0;
3042 sdkp
->cache_override
= 0;
3046 sdkp
->first_scan
= 1;
3047 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
3049 sd_revalidate_disk(gd
);
3051 gd
->flags
= GENHD_FL_EXT_DEVT
;
3052 if (sdp
->removable
) {
3053 gd
->flags
|= GENHD_FL_REMOVABLE
;
3054 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
3057 blk_pm_runtime_init(sdp
->request_queue
, dev
);
3058 device_add_disk(dev
, gd
);
3060 sd_dif_config_host(sdkp
);
3062 sd_revalidate_disk(gd
);
3064 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
3065 sdp
->removable
? "removable " : "");
3066 scsi_autopm_put_device(sdp
);
3067 put_device(&sdkp
->dev
);
3071 * sd_probe - called during driver initialization and whenever a
3072 * new scsi device is attached to the system. It is called once
3073 * for each scsi device (not just disks) present.
3074 * @dev: pointer to device object
3076 * Returns 0 if successful (or not interested in this scsi device
3077 * (e.g. scanner)); 1 when there is an error.
3079 * Note: this function is invoked from the scsi mid-level.
3080 * This function sets up the mapping between a given
3081 * <host,channel,id,lun> (found in sdp) and new device name
3082 * (e.g. /dev/sda). More precisely it is the block device major
3083 * and minor number that is chosen here.
3085 * Assume sd_probe is not re-entrant (for time being)
3086 * Also think about sd_probe() and sd_remove() running coincidentally.
3088 static int sd_probe(struct device
*dev
)
3090 struct scsi_device
*sdp
= to_scsi_device(dev
);
3091 struct scsi_disk
*sdkp
;
3096 scsi_autopm_get_device(sdp
);
3098 if (sdp
->type
!= TYPE_DISK
&&
3099 sdp
->type
!= TYPE_ZBC
&&
3100 sdp
->type
!= TYPE_MOD
&&
3101 sdp
->type
!= TYPE_RBC
)
3104 #ifndef CONFIG_BLK_DEV_ZONED
3105 if (sdp
->type
== TYPE_ZBC
)
3108 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
3112 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
3116 gd
= alloc_disk(SD_MINORS
);
3121 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
3124 spin_lock(&sd_index_lock
);
3125 error
= ida_get_new(&sd_index_ida
, &index
);
3126 spin_unlock(&sd_index_lock
);
3127 } while (error
== -EAGAIN
);
3130 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
3134 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
3136 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
3137 goto out_free_index
;
3141 sdkp
->driver
= &sd_template
;
3143 sdkp
->index
= index
;
3144 atomic_set(&sdkp
->openers
, 0);
3145 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
3147 if (!sdp
->request_queue
->rq_timeout
) {
3148 if (sdp
->type
!= TYPE_MOD
)
3149 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
3151 blk_queue_rq_timeout(sdp
->request_queue
,
3155 device_initialize(&sdkp
->dev
);
3156 sdkp
->dev
.parent
= dev
;
3157 sdkp
->dev
.class = &sd_disk_class
;
3158 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
3160 error
= device_add(&sdkp
->dev
);
3162 goto out_free_index
;
3165 dev_set_drvdata(dev
, sdkp
);
3167 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
3168 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
3173 spin_lock(&sd_index_lock
);
3174 ida_remove(&sd_index_ida
, index
);
3175 spin_unlock(&sd_index_lock
);
3181 scsi_autopm_put_device(sdp
);
3186 * sd_remove - called whenever a scsi disk (previously recognized by
3187 * sd_probe) is detached from the system. It is called (potentially
3188 * multiple times) during sd module unload.
3189 * @sdp: pointer to mid level scsi device object
3191 * Note: this function is invoked from the scsi mid-level.
3192 * This function potentially frees up a device name (e.g. /dev/sdc)
3193 * that could be re-used by a subsequent sd_probe().
3194 * This function is not called when the built-in sd driver is "exit-ed".
3196 static int sd_remove(struct device
*dev
)
3198 struct scsi_disk
*sdkp
;
3201 sdkp
= dev_get_drvdata(dev
);
3202 devt
= disk_devt(sdkp
->disk
);
3203 scsi_autopm_get_device(sdkp
->device
);
3205 async_synchronize_full_domain(&scsi_sd_pm_domain
);
3206 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3207 device_del(&sdkp
->dev
);
3208 del_gendisk(sdkp
->disk
);
3211 sd_zbc_remove(sdkp
);
3213 blk_register_region(devt
, SD_MINORS
, NULL
,
3214 sd_default_probe
, NULL
, NULL
);
3216 mutex_lock(&sd_ref_mutex
);
3217 dev_set_drvdata(dev
, NULL
);
3218 put_device(&sdkp
->dev
);
3219 mutex_unlock(&sd_ref_mutex
);
3225 * scsi_disk_release - Called to free the scsi_disk structure
3226 * @dev: pointer to embedded class device
3228 * sd_ref_mutex must be held entering this routine. Because it is
3229 * called on last put, you should always use the scsi_disk_get()
3230 * scsi_disk_put() helpers which manipulate the semaphore directly
3231 * and never do a direct put_device.
3233 static void scsi_disk_release(struct device
*dev
)
3235 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3236 struct gendisk
*disk
= sdkp
->disk
;
3238 spin_lock(&sd_index_lock
);
3239 ida_remove(&sd_index_ida
, sdkp
->index
);
3240 spin_unlock(&sd_index_lock
);
3242 disk
->private_data
= NULL
;
3244 put_device(&sdkp
->device
->sdev_gendev
);
3249 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3251 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3252 struct scsi_sense_hdr sshdr
;
3253 struct scsi_device
*sdp
= sdkp
->device
;
3257 cmd
[4] |= 1; /* START */
3259 if (sdp
->start_stop_pwr_cond
)
3260 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3262 if (!scsi_device_online(sdp
))
3265 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3266 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, 0, RQF_PM
);
3268 sd_print_result(sdkp
, "Start/Stop Unit failed", res
);
3269 if (driver_byte(res
) & DRIVER_SENSE
)
3270 sd_print_sense_hdr(sdkp
, &sshdr
);
3271 if (scsi_sense_valid(&sshdr
) &&
3272 /* 0x3a is medium not present */
3277 /* SCSI error codes must not go to the generic layer */
3285 * Send a SYNCHRONIZE CACHE instruction down to the device through
3286 * the normal SCSI command structure. Wait for the command to
3289 static void sd_shutdown(struct device
*dev
)
3291 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3294 return; /* this can happen */
3296 if (pm_runtime_suspended(dev
))
3299 if (sdkp
->WCE
&& sdkp
->media_present
) {
3300 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3301 sd_sync_cache(sdkp
);
3304 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3305 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3306 sd_start_stop_device(sdkp
, 0);
3310 static int sd_suspend_common(struct device
*dev
, bool ignore_stop_errors
)
3312 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3315 if (!sdkp
) /* E.g.: runtime suspend following sd_remove() */
3318 if (sdkp
->WCE
&& sdkp
->media_present
) {
3319 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3320 ret
= sd_sync_cache(sdkp
);
3322 /* ignore OFFLINE device */
3329 if (sdkp
->device
->manage_start_stop
) {
3330 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3331 /* an error is not worth aborting a system sleep */
3332 ret
= sd_start_stop_device(sdkp
, 0);
3333 if (ignore_stop_errors
)
3341 static int sd_suspend_system(struct device
*dev
)
3343 return sd_suspend_common(dev
, true);
3346 static int sd_suspend_runtime(struct device
*dev
)
3348 return sd_suspend_common(dev
, false);
3351 static int sd_resume(struct device
*dev
)
3353 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3355 if (!sdkp
) /* E.g.: runtime resume at the start of sd_probe() */
3358 if (!sdkp
->device
->manage_start_stop
)
3361 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3362 return sd_start_stop_device(sdkp
, 1);
3366 * init_sd - entry point for this driver (both when built in or when
3369 * Note: this function registers this driver with the scsi mid-level.
3371 static int __init
init_sd(void)
3373 int majors
= 0, i
, err
;
3375 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3377 for (i
= 0; i
< SD_MAJORS
; i
++) {
3378 if (register_blkdev(sd_major(i
), "sd") != 0)
3381 blk_register_region(sd_major(i
), SD_MINORS
, NULL
,
3382 sd_default_probe
, NULL
, NULL
);
3388 err
= class_register(&sd_disk_class
);
3392 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3394 if (!sd_cdb_cache
) {
3395 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3400 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3402 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3407 err
= scsi_register_driver(&sd_template
.gendrv
);
3409 goto err_out_driver
;
3414 mempool_destroy(sd_cdb_pool
);
3417 kmem_cache_destroy(sd_cdb_cache
);
3420 class_unregister(&sd_disk_class
);
3422 for (i
= 0; i
< SD_MAJORS
; i
++)
3423 unregister_blkdev(sd_major(i
), "sd");
3428 * exit_sd - exit point for this driver (when it is a module).
3430 * Note: this function unregisters this driver from the scsi mid-level.
3432 static void __exit
exit_sd(void)
3436 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3438 scsi_unregister_driver(&sd_template
.gendrv
);
3439 mempool_destroy(sd_cdb_pool
);
3440 kmem_cache_destroy(sd_cdb_cache
);
3442 class_unregister(&sd_disk_class
);
3444 for (i
= 0; i
< SD_MAJORS
; i
++) {
3445 blk_unregister_region(sd_major(i
), SD_MINORS
);
3446 unregister_blkdev(sd_major(i
), "sd");
3450 module_init(init_sd
);
3451 module_exit(exit_sd
);
3453 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3454 struct scsi_sense_hdr
*sshdr
)
3456 scsi_print_sense_hdr(sdkp
->device
,
3457 sdkp
->disk
? sdkp
->disk
->disk_name
: NULL
, sshdr
);
3460 static void sd_print_result(const struct scsi_disk
*sdkp
, const char *msg
,
3463 const char *hb_string
= scsi_hostbyte_string(result
);
3464 const char *db_string
= scsi_driverbyte_string(result
);
3466 if (hb_string
|| db_string
)
3467 sd_printk(KERN_INFO
, sdkp
,
3468 "%s: Result: hostbyte=%s driverbyte=%s\n", msg
,
3469 hb_string
? hb_string
: "invalid",
3470 db_string
? db_string
: "invalid");
3472 sd_printk(KERN_INFO
, sdkp
,
3473 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3474 msg
, host_byte(result
), driver_byte(result
));