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
;
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
);
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 if (sd_is_zoned(sdkp
)) {
848 ret
= sd_zbc_setup_write_cmnd(cmd
);
849 if (ret
!= BLKPREP_OK
)
853 sector
>>= ilog2(sdp
->sector_size
) - 9;
854 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
856 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
858 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
860 cmd
->cmnd
[0] = WRITE_SAME_16
;
861 put_unaligned_be64(sector
, &cmd
->cmnd
[2]);
862 put_unaligned_be32(nr_sectors
, &cmd
->cmnd
[10]);
865 cmd
->cmnd
[0] = WRITE_SAME
;
866 put_unaligned_be32(sector
, &cmd
->cmnd
[2]);
867 put_unaligned_be16(nr_sectors
, &cmd
->cmnd
[7]);
870 cmd
->transfersize
= sdp
->sector_size
;
871 cmd
->allowed
= SD_MAX_RETRIES
;
874 * For WRITE SAME the data transferred via the DATA OUT buffer is
875 * different from the amount of data actually written to the target.
877 * We set up __data_len to the amount of data transferred via the
878 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
879 * to transfer a single sector of data first, but then reset it to
880 * the amount of data to be written right after so that the I/O path
881 * knows how much to actually write.
883 rq
->__data_len
= sdp
->sector_size
;
884 ret
= scsi_init_io(cmd
);
885 rq
->__data_len
= nr_bytes
;
889 static int sd_setup_flush_cmnd(struct scsi_cmnd
*cmd
)
891 struct request
*rq
= cmd
->request
;
893 /* flush requests don't perform I/O, zero the S/G table */
894 memset(&cmd
->sdb
, 0, sizeof(cmd
->sdb
));
896 cmd
->cmnd
[0] = SYNCHRONIZE_CACHE
;
898 cmd
->transfersize
= 0;
899 cmd
->allowed
= SD_MAX_RETRIES
;
901 rq
->timeout
= rq
->q
->rq_timeout
* SD_FLUSH_TIMEOUT_MULTIPLIER
;
905 static int sd_setup_read_write_cmnd(struct scsi_cmnd
*SCpnt
)
907 struct request
*rq
= SCpnt
->request
;
908 struct scsi_device
*sdp
= SCpnt
->device
;
909 struct gendisk
*disk
= rq
->rq_disk
;
910 struct scsi_disk
*sdkp
= scsi_disk(disk
);
911 sector_t block
= blk_rq_pos(rq
);
913 unsigned int this_count
= blk_rq_sectors(rq
);
914 unsigned int dif
, dix
;
915 bool zoned_write
= sd_is_zoned(sdkp
) && rq_data_dir(rq
) == WRITE
;
917 unsigned char protect
;
920 ret
= sd_zbc_setup_write_cmnd(SCpnt
);
921 if (ret
!= BLKPREP_OK
)
925 ret
= scsi_init_io(SCpnt
);
926 if (ret
!= BLKPREP_OK
)
930 /* from here on until we're complete, any goto out
931 * is used for a killable error condition */
935 scmd_printk(KERN_INFO
, SCpnt
,
936 "%s: block=%llu, count=%d\n",
937 __func__
, (unsigned long long)block
, this_count
));
939 if (!sdp
|| !scsi_device_online(sdp
) ||
940 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
941 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
942 "Finishing %u sectors\n",
943 blk_rq_sectors(rq
)));
944 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
945 "Retry with 0x%p\n", SCpnt
));
951 * quietly refuse to do anything to a changed disc until
952 * the changed bit has been reset
954 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
959 * Some SD card readers can't handle multi-sector accesses which touch
960 * the last one or two hardware sectors. Split accesses as needed.
962 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
963 (sdp
->sector_size
/ 512);
965 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
966 if (block
< threshold
) {
967 /* Access up to the threshold but not beyond */
968 this_count
= threshold
- block
;
970 /* Access only a single hardware sector */
971 this_count
= sdp
->sector_size
/ 512;
975 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
976 (unsigned long long)block
));
979 * If we have a 1K hardware sectorsize, prevent access to single
980 * 512 byte sectors. In theory we could handle this - in fact
981 * the scsi cdrom driver must be able to handle this because
982 * we typically use 1K blocksizes, and cdroms typically have
983 * 2K hardware sectorsizes. Of course, things are simpler
984 * with the cdrom, since it is read-only. For performance
985 * reasons, the filesystems should be able to handle this
986 * and not force the scsi disk driver to use bounce buffers
989 if (sdp
->sector_size
== 1024) {
990 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
991 scmd_printk(KERN_ERR
, SCpnt
,
992 "Bad block number requested\n");
996 this_count
= this_count
>> 1;
999 if (sdp
->sector_size
== 2048) {
1000 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
1001 scmd_printk(KERN_ERR
, SCpnt
,
1002 "Bad block number requested\n");
1006 this_count
= this_count
>> 2;
1009 if (sdp
->sector_size
== 4096) {
1010 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
1011 scmd_printk(KERN_ERR
, SCpnt
,
1012 "Bad block number requested\n");
1016 this_count
= this_count
>> 3;
1019 if (rq_data_dir(rq
) == WRITE
) {
1020 SCpnt
->cmnd
[0] = WRITE_6
;
1022 if (blk_integrity_rq(rq
))
1023 sd_dif_prepare(SCpnt
);
1025 } else if (rq_data_dir(rq
) == READ
) {
1026 SCpnt
->cmnd
[0] = READ_6
;
1028 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %d\n", req_op(rq
));
1032 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
1033 "%s %d/%u 512 byte blocks.\n",
1034 (rq_data_dir(rq
) == WRITE
) ?
1035 "writing" : "reading", this_count
,
1036 blk_rq_sectors(rq
)));
1038 dix
= scsi_prot_sg_count(SCpnt
);
1039 dif
= scsi_host_dif_capable(SCpnt
->device
->host
, sdkp
->protection_type
);
1042 protect
= sd_setup_protect_cmnd(SCpnt
, dix
, dif
);
1046 if (protect
&& sdkp
->protection_type
== T10_PI_TYPE2_PROTECTION
) {
1047 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1049 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1050 ret
= BLKPREP_DEFER
;
1054 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1055 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1056 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1057 SCpnt
->cmnd
[7] = 0x18;
1058 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1059 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1062 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1063 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1064 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1065 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1066 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1067 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1068 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1069 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1071 /* Expected Indirect LBA */
1072 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1073 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1074 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1075 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1077 /* Transfer length */
1078 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1079 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1080 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1081 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1082 } else if (sdp
->use_16_for_rw
|| (this_count
> 0xffff)) {
1083 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1084 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1085 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1086 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1087 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1088 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1089 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1090 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1091 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1092 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1093 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1094 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1095 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1096 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1097 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1098 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1099 scsi_device_protection(SCpnt
->device
) ||
1100 SCpnt
->device
->use_10_for_rw
) {
1101 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1102 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1103 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1104 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1105 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1106 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1107 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1108 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1109 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1111 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1113 * This happens only if this drive failed
1114 * 10byte rw command with ILLEGAL_REQUEST
1115 * during operation and thus turned off
1118 scmd_printk(KERN_ERR
, SCpnt
,
1119 "FUA write on READ/WRITE(6) drive\n");
1123 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1124 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1125 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1126 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1129 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1132 * We shouldn't disconnect in the middle of a sector, so with a dumb
1133 * host adapter, it's safe to assume that we can at least transfer
1134 * this many bytes between each connect / disconnect.
1136 SCpnt
->transfersize
= sdp
->sector_size
;
1137 SCpnt
->underflow
= this_count
<< 9;
1138 SCpnt
->allowed
= SD_MAX_RETRIES
;
1141 * This indicates that the command is ready from our end to be
1146 if (zoned_write
&& ret
!= BLKPREP_OK
)
1147 sd_zbc_cancel_write_cmnd(SCpnt
);
1152 static int sd_init_command(struct scsi_cmnd
*cmd
)
1154 struct request
*rq
= cmd
->request
;
1156 switch (req_op(rq
)) {
1157 case REQ_OP_DISCARD
:
1158 return sd_setup_discard_cmnd(cmd
);
1159 case REQ_OP_WRITE_SAME
:
1160 return sd_setup_write_same_cmnd(cmd
);
1162 return sd_setup_flush_cmnd(cmd
);
1165 return sd_setup_read_write_cmnd(cmd
);
1166 case REQ_OP_ZONE_REPORT
:
1167 return sd_zbc_setup_report_cmnd(cmd
);
1168 case REQ_OP_ZONE_RESET
:
1169 return sd_zbc_setup_reset_cmnd(cmd
);
1175 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
)
1177 struct request
*rq
= SCpnt
->request
;
1179 if (rq
->rq_flags
& RQF_SPECIAL_PAYLOAD
)
1180 __free_page(rq
->special_vec
.bv_page
);
1182 if (SCpnt
->cmnd
!= rq
->cmd
) {
1183 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1190 * sd_open - open a scsi disk device
1191 * @inode: only i_rdev member may be used
1192 * @filp: only f_mode and f_flags may be used
1194 * Returns 0 if successful. Returns a negated errno value in case
1197 * Note: This can be called from a user context (e.g. fsck(1) )
1198 * or from within the kernel (e.g. as a result of a mount(1) ).
1199 * In the latter case @inode and @filp carry an abridged amount
1200 * of information as noted above.
1202 * Locking: called with bdev->bd_mutex held.
1204 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1206 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1207 struct scsi_device
*sdev
;
1213 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1215 sdev
= sdkp
->device
;
1218 * If the device is in error recovery, wait until it is done.
1219 * If the device is offline, then disallow any access to it.
1222 if (!scsi_block_when_processing_errors(sdev
))
1225 if (sdev
->removable
|| sdkp
->write_prot
)
1226 check_disk_change(bdev
);
1229 * If the drive is empty, just let the open fail.
1231 retval
= -ENOMEDIUM
;
1232 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1236 * If the device has the write protect tab set, have the open fail
1237 * if the user expects to be able to write to the thing.
1240 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1244 * It is possible that the disk changing stuff resulted in
1245 * the device being taken offline. If this is the case,
1246 * report this to the user, and don't pretend that the
1247 * open actually succeeded.
1250 if (!scsi_device_online(sdev
))
1253 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1254 if (scsi_block_when_processing_errors(sdev
))
1255 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1261 scsi_disk_put(sdkp
);
1266 * sd_release - invoked when the (last) close(2) is called on this
1268 * @inode: only i_rdev member may be used
1269 * @filp: only f_mode and f_flags may be used
1273 * Note: may block (uninterruptible) if error recovery is underway
1276 * Locking: called with bdev->bd_mutex held.
1278 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1280 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1281 struct scsi_device
*sdev
= sdkp
->device
;
1283 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1285 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1286 if (scsi_block_when_processing_errors(sdev
))
1287 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1291 * XXX and what if there are packets in flight and this close()
1292 * XXX is followed by a "rmmod sd_mod"?
1295 scsi_disk_put(sdkp
);
1298 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1300 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1301 struct scsi_device
*sdp
= sdkp
->device
;
1302 struct Scsi_Host
*host
= sdp
->host
;
1303 sector_t capacity
= logical_to_sectors(sdp
, sdkp
->capacity
);
1306 /* default to most commonly used values */
1307 diskinfo
[0] = 0x40; /* 1 << 6 */
1308 diskinfo
[1] = 0x20; /* 1 << 5 */
1309 diskinfo
[2] = capacity
>> 11;
1311 /* override with calculated, extended default, or driver values */
1312 if (host
->hostt
->bios_param
)
1313 host
->hostt
->bios_param(sdp
, bdev
, capacity
, diskinfo
);
1315 scsicam_bios_param(bdev
, capacity
, diskinfo
);
1317 geo
->heads
= diskinfo
[0];
1318 geo
->sectors
= diskinfo
[1];
1319 geo
->cylinders
= diskinfo
[2];
1324 * sd_ioctl - process an ioctl
1325 * @inode: only i_rdev/i_bdev members may be used
1326 * @filp: only f_mode and f_flags may be used
1327 * @cmd: ioctl command number
1328 * @arg: this is third argument given to ioctl(2) system call.
1329 * Often contains a pointer.
1331 * Returns 0 if successful (some ioctls return positive numbers on
1332 * success as well). Returns a negated errno value in case of error.
1334 * Note: most ioctls are forward onto the block subsystem or further
1335 * down in the scsi subsystem.
1337 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1338 unsigned int cmd
, unsigned long arg
)
1340 struct gendisk
*disk
= bdev
->bd_disk
;
1341 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1342 struct scsi_device
*sdp
= sdkp
->device
;
1343 void __user
*p
= (void __user
*)arg
;
1346 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1347 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1349 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1354 * If we are in the middle of error recovery, don't let anyone
1355 * else try and use this device. Also, if error recovery fails, it
1356 * may try and take the device offline, in which case all further
1357 * access to the device is prohibited.
1359 error
= scsi_ioctl_block_when_processing_errors(sdp
, cmd
,
1360 (mode
& FMODE_NDELAY
) != 0);
1365 * Send SCSI addressing ioctls directly to mid level, send other
1366 * ioctls to block level and then onto mid level if they can't be
1370 case SCSI_IOCTL_GET_IDLUN
:
1371 case SCSI_IOCTL_GET_BUS_NUMBER
:
1372 error
= scsi_ioctl(sdp
, cmd
, p
);
1375 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1376 if (error
!= -ENOTTY
)
1378 error
= scsi_ioctl(sdp
, cmd
, p
);
1385 static void set_media_not_present(struct scsi_disk
*sdkp
)
1387 if (sdkp
->media_present
)
1388 sdkp
->device
->changed
= 1;
1390 if (sdkp
->device
->removable
) {
1391 sdkp
->media_present
= 0;
1396 static int media_not_present(struct scsi_disk
*sdkp
,
1397 struct scsi_sense_hdr
*sshdr
)
1399 if (!scsi_sense_valid(sshdr
))
1402 /* not invoked for commands that could return deferred errors */
1403 switch (sshdr
->sense_key
) {
1404 case UNIT_ATTENTION
:
1406 /* medium not present */
1407 if (sshdr
->asc
== 0x3A) {
1408 set_media_not_present(sdkp
);
1416 * sd_check_events - check media events
1417 * @disk: kernel device descriptor
1418 * @clearing: disk events currently being cleared
1420 * Returns mask of DISK_EVENT_*.
1422 * Note: this function is invoked from the block subsystem.
1424 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1426 struct scsi_disk
*sdkp
= scsi_disk_get(disk
);
1427 struct scsi_device
*sdp
;
1428 struct scsi_sense_hdr
*sshdr
= NULL
;
1435 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1438 * If the device is offline, don't send any commands - just pretend as
1439 * if the command failed. If the device ever comes back online, we
1440 * can deal with it then. It is only because of unrecoverable errors
1441 * that we would ever take a device offline in the first place.
1443 if (!scsi_device_online(sdp
)) {
1444 set_media_not_present(sdkp
);
1449 * Using TEST_UNIT_READY enables differentiation between drive with
1450 * no cartridge loaded - NOT READY, drive with changed cartridge -
1451 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1453 * Drives that auto spin down. eg iomega jaz 1G, will be started
1454 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1455 * sd_revalidate() is called.
1459 if (scsi_block_when_processing_errors(sdp
)) {
1460 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1461 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1465 /* failed to execute TUR, assume media not present */
1466 if (host_byte(retval
)) {
1467 set_media_not_present(sdkp
);
1471 if (media_not_present(sdkp
, sshdr
))
1475 * For removable scsi disk we have to recognise the presence
1476 * of a disk in the drive.
1478 if (!sdkp
->media_present
)
1480 sdkp
->media_present
= 1;
1483 * sdp->changed is set under the following conditions:
1485 * Medium present state has changed in either direction.
1486 * Device has indicated UNIT_ATTENTION.
1489 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1491 scsi_disk_put(sdkp
);
1495 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1498 struct scsi_device
*sdp
= sdkp
->device
;
1499 const int timeout
= sdp
->request_queue
->rq_timeout
1500 * SD_FLUSH_TIMEOUT_MULTIPLIER
;
1501 struct scsi_sense_hdr sshdr
;
1503 if (!scsi_device_online(sdp
))
1506 for (retries
= 3; retries
> 0; --retries
) {
1507 unsigned char cmd
[10] = { 0 };
1509 cmd
[0] = SYNCHRONIZE_CACHE
;
1511 * Leave the rest of the command zero to indicate
1514 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1515 &sshdr
, timeout
, SD_MAX_RETRIES
,
1522 sd_print_result(sdkp
, "Synchronize Cache(10) failed", res
);
1524 if (driver_byte(res
) & DRIVER_SENSE
)
1525 sd_print_sense_hdr(sdkp
, &sshdr
);
1526 /* we need to evaluate the error return */
1527 if (scsi_sense_valid(&sshdr
) &&
1528 (sshdr
.asc
== 0x3a || /* medium not present */
1529 sshdr
.asc
== 0x20)) /* invalid command */
1530 /* this is no error here */
1533 switch (host_byte(res
)) {
1534 /* ignore errors due to racing a disconnection */
1535 case DID_BAD_TARGET
:
1536 case DID_NO_CONNECT
:
1538 /* signal the upper layer it might try again */
1542 case DID_SOFT_ERROR
:
1551 static void sd_rescan(struct device
*dev
)
1553 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1555 revalidate_disk(sdkp
->disk
);
1559 #ifdef CONFIG_COMPAT
1561 * This gets directly called from VFS. When the ioctl
1562 * is not recognized we go back to the other translation paths.
1564 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1565 unsigned int cmd
, unsigned long arg
)
1567 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1570 error
= scsi_ioctl_block_when_processing_errors(sdev
, cmd
,
1571 (mode
& FMODE_NDELAY
) != 0);
1576 * Let the static ioctl translation table take care of it.
1578 if (!sdev
->host
->hostt
->compat_ioctl
)
1579 return -ENOIOCTLCMD
;
1580 return sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1584 static char sd_pr_type(enum pr_type type
)
1587 case PR_WRITE_EXCLUSIVE
:
1589 case PR_EXCLUSIVE_ACCESS
:
1591 case PR_WRITE_EXCLUSIVE_REG_ONLY
:
1593 case PR_EXCLUSIVE_ACCESS_REG_ONLY
:
1595 case PR_WRITE_EXCLUSIVE_ALL_REGS
:
1597 case PR_EXCLUSIVE_ACCESS_ALL_REGS
:
1604 static int sd_pr_command(struct block_device
*bdev
, u8 sa
,
1605 u64 key
, u64 sa_key
, u8 type
, u8 flags
)
1607 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1608 struct scsi_sense_hdr sshdr
;
1610 u8 cmd
[16] = { 0, };
1611 u8 data
[24] = { 0, };
1613 cmd
[0] = PERSISTENT_RESERVE_OUT
;
1616 put_unaligned_be32(sizeof(data
), &cmd
[5]);
1618 put_unaligned_be64(key
, &data
[0]);
1619 put_unaligned_be64(sa_key
, &data
[8]);
1622 result
= scsi_execute_req(sdev
, cmd
, DMA_TO_DEVICE
, &data
, sizeof(data
),
1623 &sshdr
, SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1625 if ((driver_byte(result
) & DRIVER_SENSE
) &&
1626 (scsi_sense_valid(&sshdr
))) {
1627 sdev_printk(KERN_INFO
, sdev
, "PR command failed: %d\n", result
);
1628 scsi_print_sense_hdr(sdev
, NULL
, &sshdr
);
1634 static int sd_pr_register(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1637 if (flags
& ~PR_FL_IGNORE_KEY
)
1639 return sd_pr_command(bdev
, (flags
& PR_FL_IGNORE_KEY
) ? 0x06 : 0x00,
1640 old_key
, new_key
, 0,
1641 (1 << 0) /* APTPL */);
1644 static int sd_pr_reserve(struct block_device
*bdev
, u64 key
, enum pr_type type
,
1649 return sd_pr_command(bdev
, 0x01, key
, 0, sd_pr_type(type
), 0);
1652 static int sd_pr_release(struct block_device
*bdev
, u64 key
, enum pr_type type
)
1654 return sd_pr_command(bdev
, 0x02, key
, 0, sd_pr_type(type
), 0);
1657 static int sd_pr_preempt(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1658 enum pr_type type
, bool abort
)
1660 return sd_pr_command(bdev
, abort
? 0x05 : 0x04, old_key
, new_key
,
1661 sd_pr_type(type
), 0);
1664 static int sd_pr_clear(struct block_device
*bdev
, u64 key
)
1666 return sd_pr_command(bdev
, 0x03, key
, 0, 0, 0);
1669 static const struct pr_ops sd_pr_ops
= {
1670 .pr_register
= sd_pr_register
,
1671 .pr_reserve
= sd_pr_reserve
,
1672 .pr_release
= sd_pr_release
,
1673 .pr_preempt
= sd_pr_preempt
,
1674 .pr_clear
= sd_pr_clear
,
1677 static const struct block_device_operations sd_fops
= {
1678 .owner
= THIS_MODULE
,
1680 .release
= sd_release
,
1682 .getgeo
= sd_getgeo
,
1683 #ifdef CONFIG_COMPAT
1684 .compat_ioctl
= sd_compat_ioctl
,
1686 .check_events
= sd_check_events
,
1687 .revalidate_disk
= sd_revalidate_disk
,
1688 .unlock_native_capacity
= sd_unlock_native_capacity
,
1689 .pr_ops
= &sd_pr_ops
,
1693 * sd_eh_action - error handling callback
1694 * @scmd: sd-issued command that has failed
1695 * @eh_disp: The recovery disposition suggested by the midlayer
1697 * This function is called by the SCSI midlayer upon completion of an
1698 * error test command (currently TEST UNIT READY). The result of sending
1699 * the eh command is passed in eh_disp. We're looking for devices that
1700 * fail medium access commands but are OK with non access commands like
1701 * test unit ready (so wrongly see the device as having a successful
1704 static int sd_eh_action(struct scsi_cmnd
*scmd
, int eh_disp
)
1706 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1708 if (!scsi_device_online(scmd
->device
) ||
1709 !scsi_medium_access_command(scmd
) ||
1710 host_byte(scmd
->result
) != DID_TIME_OUT
||
1715 * The device has timed out executing a medium access command.
1716 * However, the TEST UNIT READY command sent during error
1717 * handling completed successfully. Either the device is in the
1718 * process of recovering or has it suffered an internal failure
1719 * that prevents access to the storage medium.
1721 sdkp
->medium_access_timed_out
++;
1724 * If the device keeps failing read/write commands but TEST UNIT
1725 * READY always completes successfully we assume that medium
1726 * access is no longer possible and take the device offline.
1728 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1729 scmd_printk(KERN_ERR
, scmd
,
1730 "Medium access timeout failure. Offlining disk!\n");
1731 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1739 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1741 u64 start_lba
= blk_rq_pos(scmd
->request
);
1742 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1743 u64 factor
= scmd
->device
->sector_size
/ 512;
1747 * resid is optional but mostly filled in. When it's unused,
1748 * its value is zero, so we assume the whole buffer transferred
1750 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1751 unsigned int good_bytes
;
1753 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1756 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1757 SCSI_SENSE_BUFFERSIZE
,
1762 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1765 /* be careful ... don't want any overflows */
1766 do_div(start_lba
, factor
);
1767 do_div(end_lba
, factor
);
1769 /* The bad lba was reported incorrectly, we have no idea where
1772 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1775 /* This computation should always be done in terms of
1776 * the resolution of the device's medium.
1778 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1779 return min(good_bytes
, transferred
);
1783 * sd_done - bottom half handler: called when the lower level
1784 * driver has completed (successfully or otherwise) a scsi command.
1785 * @SCpnt: mid-level's per command structure.
1787 * Note: potentially run from within an ISR. Must not block.
1789 static int sd_done(struct scsi_cmnd
*SCpnt
)
1791 int result
= SCpnt
->result
;
1792 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1793 struct scsi_sense_hdr sshdr
;
1794 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1795 struct request
*req
= SCpnt
->request
;
1796 int sense_valid
= 0;
1797 int sense_deferred
= 0;
1798 unsigned char op
= SCpnt
->cmnd
[0];
1799 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1801 switch (req_op(req
)) {
1802 case REQ_OP_DISCARD
:
1803 case REQ_OP_WRITE_SAME
:
1804 case REQ_OP_ZONE_RESET
:
1806 good_bytes
= blk_rq_bytes(req
);
1807 scsi_set_resid(SCpnt
, 0);
1810 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1813 case REQ_OP_ZONE_REPORT
:
1815 good_bytes
= scsi_bufflen(SCpnt
)
1816 - scsi_get_resid(SCpnt
);
1817 scsi_set_resid(SCpnt
, 0);
1820 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1826 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1828 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1830 sdkp
->medium_access_timed_out
= 0;
1832 if (driver_byte(result
) != DRIVER_SENSE
&&
1833 (!sense_valid
|| sense_deferred
))
1836 switch (sshdr
.sense_key
) {
1837 case HARDWARE_ERROR
:
1839 good_bytes
= sd_completed_bytes(SCpnt
);
1841 case RECOVERED_ERROR
:
1842 good_bytes
= scsi_bufflen(SCpnt
);
1845 /* This indicates a false check condition, so ignore it. An
1846 * unknown amount of data was transferred so treat it as an
1850 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1852 case ABORTED_COMMAND
:
1853 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1854 good_bytes
= sd_completed_bytes(SCpnt
);
1856 case ILLEGAL_REQUEST
:
1857 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1858 good_bytes
= sd_completed_bytes(SCpnt
);
1859 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1860 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1863 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1868 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1870 sdkp
->device
->no_write_same
= 1;
1871 sd_config_write_same(sdkp
);
1874 req
->__data_len
= blk_rq_bytes(req
);
1875 req
->rq_flags
|= RQF_QUIET
;
1885 if (sd_is_zoned(sdkp
))
1886 sd_zbc_complete(SCpnt
, good_bytes
, &sshdr
);
1888 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1889 "sd_done: completed %d of %d bytes\n",
1890 good_bytes
, scsi_bufflen(SCpnt
)));
1892 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1893 sd_dif_complete(SCpnt
, good_bytes
);
1899 * spinup disk - called only in sd_revalidate_disk()
1902 sd_spinup_disk(struct scsi_disk
*sdkp
)
1904 unsigned char cmd
[10];
1905 unsigned long spintime_expire
= 0;
1906 int retries
, spintime
;
1907 unsigned int the_result
;
1908 struct scsi_sense_hdr sshdr
;
1909 int sense_valid
= 0;
1913 /* Spin up drives, as required. Only do this at boot time */
1914 /* Spinup needs to be done for module loads too. */
1919 cmd
[0] = TEST_UNIT_READY
;
1920 memset((void *) &cmd
[1], 0, 9);
1922 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1925 SD_MAX_RETRIES
, NULL
);
1928 * If the drive has indicated to us that it
1929 * doesn't have any media in it, don't bother
1930 * with any more polling.
1932 if (media_not_present(sdkp
, &sshdr
))
1936 sense_valid
= scsi_sense_valid(&sshdr
);
1938 } while (retries
< 3 &&
1939 (!scsi_status_is_good(the_result
) ||
1940 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1941 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1943 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1944 /* no sense, TUR either succeeded or failed
1945 * with a status error */
1946 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1947 sd_print_result(sdkp
, "Test Unit Ready failed",
1954 * The device does not want the automatic start to be issued.
1956 if (sdkp
->device
->no_start_on_add
)
1959 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1960 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1961 break; /* manual intervention required */
1962 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1963 break; /* standby */
1964 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1965 break; /* unavailable */
1967 * Issue command to spin up drive when not ready
1970 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1971 cmd
[0] = START_STOP
;
1972 cmd
[1] = 1; /* Return immediately */
1973 memset((void *) &cmd
[2], 0, 8);
1974 cmd
[4] = 1; /* Start spin cycle */
1975 if (sdkp
->device
->start_stop_pwr_cond
)
1977 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1979 SD_TIMEOUT
, SD_MAX_RETRIES
,
1981 spintime_expire
= jiffies
+ 100 * HZ
;
1984 /* Wait 1 second for next try */
1989 * Wait for USB flash devices with slow firmware.
1990 * Yes, this sense key/ASC combination shouldn't
1991 * occur here. It's characteristic of these devices.
1993 } else if (sense_valid
&&
1994 sshdr
.sense_key
== UNIT_ATTENTION
&&
1995 sshdr
.asc
== 0x28) {
1997 spintime_expire
= jiffies
+ 5 * HZ
;
2000 /* Wait 1 second for next try */
2003 /* we don't understand the sense code, so it's
2004 * probably pointless to loop */
2006 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
2007 sd_print_sense_hdr(sdkp
, &sshdr
);
2012 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
2015 if (scsi_status_is_good(the_result
))
2018 printk("not responding...\n");
2023 * Determine whether disk supports Data Integrity Field.
2025 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2027 struct scsi_device
*sdp
= sdkp
->device
;
2031 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
2034 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2036 if (type
> T10_PI_TYPE3_PROTECTION
)
2038 else if (scsi_host_dif_capable(sdp
->host
, type
))
2041 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
2044 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
2045 " protection type %u. Disabling disk!\n",
2049 sd_printk(KERN_NOTICE
, sdkp
,
2050 "Enabling DIF Type %u protection\n", type
);
2053 sd_printk(KERN_NOTICE
, sdkp
,
2054 "Disabling DIF Type %u protection\n", type
);
2058 sdkp
->protection_type
= type
;
2063 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2064 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
2067 if (driver_byte(the_result
) & DRIVER_SENSE
)
2068 sd_print_sense_hdr(sdkp
, sshdr
);
2070 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
2073 * Set dirty bit for removable devices if not ready -
2074 * sometimes drives will not report this properly.
2076 if (sdp
->removable
&&
2077 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
2078 set_media_not_present(sdkp
);
2081 * We used to set media_present to 0 here to indicate no media
2082 * in the drive, but some drives fail read capacity even with
2083 * media present, so we can't do that.
2085 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
2089 #if RC16_LEN > SD_BUF_SIZE
2090 #error RC16_LEN must not be more than SD_BUF_SIZE
2093 #define READ_CAPACITY_RETRIES_ON_RESET 10
2095 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2096 unsigned char *buffer
)
2098 unsigned char cmd
[16];
2099 struct scsi_sense_hdr sshdr
;
2100 int sense_valid
= 0;
2102 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2103 unsigned int alignment
;
2104 unsigned long long lba
;
2105 unsigned sector_size
;
2107 if (sdp
->no_read_capacity_16
)
2112 cmd
[0] = SERVICE_ACTION_IN_16
;
2113 cmd
[1] = SAI_READ_CAPACITY_16
;
2115 memset(buffer
, 0, RC16_LEN
);
2117 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2118 buffer
, RC16_LEN
, &sshdr
,
2119 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2121 if (media_not_present(sdkp
, &sshdr
))
2125 sense_valid
= scsi_sense_valid(&sshdr
);
2127 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2128 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
2130 /* Invalid Command Operation Code or
2131 * Invalid Field in CDB, just retry
2132 * silently with RC10 */
2135 sshdr
.sense_key
== UNIT_ATTENTION
&&
2136 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2137 /* Device reset might occur several times,
2138 * give it one more chance */
2139 if (--reset_retries
> 0)
2144 } while (the_result
&& retries
);
2147 sd_print_result(sdkp
, "Read Capacity(16) failed", the_result
);
2148 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2152 sector_size
= get_unaligned_be32(&buffer
[8]);
2153 lba
= get_unaligned_be64(&buffer
[0]);
2155 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
2160 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
2161 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2162 "kernel compiled with support for large block "
2168 /* Logical blocks per physical block exponent */
2169 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2172 sdkp
->rc_basis
= (buffer
[12] >> 4) & 0x3;
2174 /* Lowest aligned logical block */
2175 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2176 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2177 if (alignment
&& sdkp
->first_scan
)
2178 sd_printk(KERN_NOTICE
, sdkp
,
2179 "physical block alignment offset: %u\n", alignment
);
2181 if (buffer
[14] & 0x80) { /* LBPME */
2184 if (buffer
[14] & 0x40) /* LBPRZ */
2187 sd_config_discard(sdkp
, SD_LBP_WS16
);
2190 sdkp
->capacity
= lba
+ 1;
2194 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2195 unsigned char *buffer
)
2197 unsigned char cmd
[16];
2198 struct scsi_sense_hdr sshdr
;
2199 int sense_valid
= 0;
2201 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2203 unsigned sector_size
;
2206 cmd
[0] = READ_CAPACITY
;
2207 memset(&cmd
[1], 0, 9);
2208 memset(buffer
, 0, 8);
2210 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2212 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2214 if (media_not_present(sdkp
, &sshdr
))
2218 sense_valid
= scsi_sense_valid(&sshdr
);
2220 sshdr
.sense_key
== UNIT_ATTENTION
&&
2221 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2222 /* Device reset might occur several times,
2223 * give it one more chance */
2224 if (--reset_retries
> 0)
2229 } while (the_result
&& retries
);
2232 sd_print_result(sdkp
, "Read Capacity(10) failed", the_result
);
2233 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2237 sector_size
= get_unaligned_be32(&buffer
[4]);
2238 lba
= get_unaligned_be32(&buffer
[0]);
2240 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2241 /* Some buggy (usb cardreader) devices return an lba of
2242 0xffffffff when the want to report a size of 0 (with
2243 which they really mean no media is present) */
2245 sdkp
->physical_block_size
= sector_size
;
2249 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2250 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2251 "kernel compiled with support for large block "
2257 sdkp
->capacity
= lba
+ 1;
2258 sdkp
->physical_block_size
= sector_size
;
2262 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2264 if (sdp
->host
->max_cmd_len
< 16)
2266 if (sdp
->try_rc_10_first
)
2268 if (sdp
->scsi_level
> SCSI_SPC_2
)
2270 if (scsi_device_protection(sdp
))
2276 * read disk capacity
2279 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2282 struct scsi_device
*sdp
= sdkp
->device
;
2284 if (sd_try_rc16_first(sdp
)) {
2285 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2286 if (sector_size
== -EOVERFLOW
)
2288 if (sector_size
== -ENODEV
)
2290 if (sector_size
< 0)
2291 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2292 if (sector_size
< 0)
2295 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2296 if (sector_size
== -EOVERFLOW
)
2298 if (sector_size
< 0)
2300 if ((sizeof(sdkp
->capacity
) > 4) &&
2301 (sdkp
->capacity
> 0xffffffffULL
)) {
2302 int old_sector_size
= sector_size
;
2303 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2304 "Trying to use READ CAPACITY(16).\n");
2305 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2306 if (sector_size
< 0) {
2307 sd_printk(KERN_NOTICE
, sdkp
,
2308 "Using 0xffffffff as device size\n");
2309 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2310 sector_size
= old_sector_size
;
2316 /* Some devices are known to return the total number of blocks,
2317 * not the highest block number. Some devices have versions
2318 * which do this and others which do not. Some devices we might
2319 * suspect of doing this but we don't know for certain.
2321 * If we know the reported capacity is wrong, decrement it. If
2322 * we can only guess, then assume the number of blocks is even
2323 * (usually true but not always) and err on the side of lowering
2326 if (sdp
->fix_capacity
||
2327 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2328 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2329 "from its reported value: %llu\n",
2330 (unsigned long long) sdkp
->capacity
);
2335 if (sector_size
== 0) {
2337 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2341 if (sector_size
!= 512 &&
2342 sector_size
!= 1024 &&
2343 sector_size
!= 2048 &&
2344 sector_size
!= 4096) {
2345 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2348 * The user might want to re-format the drive with
2349 * a supported sectorsize. Once this happens, it
2350 * would be relatively trivial to set the thing up.
2351 * For this reason, we leave the thing in the table.
2355 * set a bogus sector size so the normal read/write
2356 * logic in the block layer will eventually refuse any
2357 * request on this device without tripping over power
2358 * of two sector size assumptions
2362 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2363 blk_queue_physical_block_size(sdp
->request_queue
,
2364 sdkp
->physical_block_size
);
2365 sdkp
->device
->sector_size
= sector_size
;
2367 if (sdkp
->capacity
> 0xffffffff)
2368 sdp
->use_16_for_rw
= 1;
2373 * Print disk capacity
2376 sd_print_capacity(struct scsi_disk
*sdkp
,
2377 sector_t old_capacity
)
2379 int sector_size
= sdkp
->device
->sector_size
;
2380 char cap_str_2
[10], cap_str_10
[10];
2382 string_get_size(sdkp
->capacity
, sector_size
,
2383 STRING_UNITS_2
, cap_str_2
, sizeof(cap_str_2
));
2384 string_get_size(sdkp
->capacity
, sector_size
,
2385 STRING_UNITS_10
, cap_str_10
,
2386 sizeof(cap_str_10
));
2388 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2389 sd_printk(KERN_NOTICE
, sdkp
,
2390 "%llu %d-byte logical blocks: (%s/%s)\n",
2391 (unsigned long long)sdkp
->capacity
,
2392 sector_size
, cap_str_10
, cap_str_2
);
2394 if (sdkp
->physical_block_size
!= sector_size
)
2395 sd_printk(KERN_NOTICE
, sdkp
,
2396 "%u-byte physical blocks\n",
2397 sdkp
->physical_block_size
);
2399 sd_zbc_print_zones(sdkp
);
2403 /* called with buffer of length 512 */
2405 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2406 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2407 struct scsi_sense_hdr
*sshdr
)
2409 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2410 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2415 * read write protect setting, if possible - called only in sd_revalidate_disk()
2416 * called with buffer of length SD_BUF_SIZE
2419 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2422 struct scsi_device
*sdp
= sdkp
->device
;
2423 struct scsi_mode_data data
;
2424 int old_wp
= sdkp
->write_prot
;
2426 set_disk_ro(sdkp
->disk
, 0);
2427 if (sdp
->skip_ms_page_3f
) {
2428 sd_first_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2432 if (sdp
->use_192_bytes_for_3f
) {
2433 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2436 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2437 * We have to start carefully: some devices hang if we ask
2438 * for more than is available.
2440 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2443 * Second attempt: ask for page 0 When only page 0 is
2444 * implemented, a request for page 3F may return Sense Key
2445 * 5: Illegal Request, Sense Code 24: Invalid field in
2448 if (!scsi_status_is_good(res
))
2449 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2452 * Third attempt: ask 255 bytes, as we did earlier.
2454 if (!scsi_status_is_good(res
))
2455 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2459 if (!scsi_status_is_good(res
)) {
2460 sd_first_printk(KERN_WARNING
, sdkp
,
2461 "Test WP failed, assume Write Enabled\n");
2463 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2464 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2465 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2466 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2467 sdkp
->write_prot
? "on" : "off");
2468 sd_printk(KERN_DEBUG
, sdkp
, "Mode Sense: %4ph\n", buffer
);
2474 * sd_read_cache_type - called only from sd_revalidate_disk()
2475 * called with buffer of length SD_BUF_SIZE
2478 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2481 struct scsi_device
*sdp
= sdkp
->device
;
2486 struct scsi_mode_data data
;
2487 struct scsi_sense_hdr sshdr
;
2488 int old_wce
= sdkp
->WCE
;
2489 int old_rcd
= sdkp
->RCD
;
2490 int old_dpofua
= sdkp
->DPOFUA
;
2493 if (sdkp
->cache_override
)
2497 if (sdp
->skip_ms_page_8
) {
2498 if (sdp
->type
== TYPE_RBC
)
2501 if (sdp
->skip_ms_page_3f
)
2504 if (sdp
->use_192_bytes_for_3f
)
2508 } else if (sdp
->type
== TYPE_RBC
) {
2516 /* cautiously ask */
2517 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2520 if (!scsi_status_is_good(res
))
2523 if (!data
.header_length
) {
2526 sd_first_printk(KERN_ERR
, sdkp
,
2527 "Missing header in MODE_SENSE response\n");
2530 /* that went OK, now ask for the proper length */
2534 * We're only interested in the first three bytes, actually.
2535 * But the data cache page is defined for the first 20.
2539 else if (len
> SD_BUF_SIZE
) {
2540 sd_first_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2541 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2544 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2548 if (len
> first_len
)
2549 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2552 if (scsi_status_is_good(res
)) {
2553 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2555 while (offset
< len
) {
2556 u8 page_code
= buffer
[offset
] & 0x3F;
2557 u8 spf
= buffer
[offset
] & 0x40;
2559 if (page_code
== 8 || page_code
== 6) {
2560 /* We're interested only in the first 3 bytes.
2562 if (len
- offset
<= 2) {
2563 sd_first_printk(KERN_ERR
, sdkp
,
2564 "Incomplete mode parameter "
2568 modepage
= page_code
;
2572 /* Go to the next page */
2573 if (spf
&& len
- offset
> 3)
2574 offset
+= 4 + (buffer
[offset
+2] << 8) +
2576 else if (!spf
&& len
- offset
> 1)
2577 offset
+= 2 + buffer
[offset
+1];
2579 sd_first_printk(KERN_ERR
, sdkp
,
2581 "parameter data\n");
2587 sd_first_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2591 if (modepage
== 8) {
2592 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2593 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2595 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2599 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2600 if (sdp
->broken_fua
) {
2601 sd_first_printk(KERN_NOTICE
, sdkp
, "Disabling FUA\n");
2603 } else if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
&&
2604 !sdkp
->device
->use_16_for_rw
) {
2605 sd_first_printk(KERN_NOTICE
, sdkp
,
2606 "Uses READ/WRITE(6), disabling FUA\n");
2610 /* No cache flush allowed for write protected devices */
2611 if (sdkp
->WCE
&& sdkp
->write_prot
)
2614 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2615 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2616 sd_printk(KERN_NOTICE
, sdkp
,
2617 "Write cache: %s, read cache: %s, %s\n",
2618 sdkp
->WCE
? "enabled" : "disabled",
2619 sdkp
->RCD
? "disabled" : "enabled",
2620 sdkp
->DPOFUA
? "supports DPO and FUA"
2621 : "doesn't support DPO or FUA");
2627 if (scsi_sense_valid(&sshdr
) &&
2628 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2629 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2630 /* Invalid field in CDB */
2631 sd_first_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2633 sd_first_printk(KERN_ERR
, sdkp
,
2634 "Asking for cache data failed\n");
2637 if (sdp
->wce_default_on
) {
2638 sd_first_printk(KERN_NOTICE
, sdkp
,
2639 "Assuming drive cache: write back\n");
2642 sd_first_printk(KERN_ERR
, sdkp
,
2643 "Assuming drive cache: write through\n");
2651 * The ATO bit indicates whether the DIF application tag is available
2652 * for use by the operating system.
2654 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2657 struct scsi_device
*sdp
= sdkp
->device
;
2658 struct scsi_mode_data data
;
2659 struct scsi_sense_hdr sshdr
;
2661 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_ZBC
)
2664 if (sdkp
->protection_type
== 0)
2667 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2668 SD_MAX_RETRIES
, &data
, &sshdr
);
2670 if (!scsi_status_is_good(res
) || !data
.header_length
||
2672 sd_first_printk(KERN_WARNING
, sdkp
,
2673 "getting Control mode page failed, assume no ATO\n");
2675 if (scsi_sense_valid(&sshdr
))
2676 sd_print_sense_hdr(sdkp
, &sshdr
);
2681 offset
= data
.header_length
+ data
.block_descriptor_length
;
2683 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2684 sd_first_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2688 if ((buffer
[offset
+ 5] & 0x80) == 0)
2697 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2698 * @disk: disk to query
2700 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2702 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2703 const int vpd_len
= 64;
2704 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2707 /* Block Limits VPD */
2708 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2711 blk_queue_io_min(sdkp
->disk
->queue
,
2712 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2714 sdkp
->max_xfer_blocks
= get_unaligned_be32(&buffer
[8]);
2715 sdkp
->opt_xfer_blocks
= get_unaligned_be32(&buffer
[12]);
2717 if (buffer
[3] == 0x3c) {
2718 unsigned int lba_count
, desc_count
;
2720 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2725 lba_count
= get_unaligned_be32(&buffer
[20]);
2726 desc_count
= get_unaligned_be32(&buffer
[24]);
2728 if (lba_count
&& desc_count
)
2729 sdkp
->max_unmap_blocks
= lba_count
;
2731 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2733 if (buffer
[32] & 0x80)
2734 sdkp
->unmap_alignment
=
2735 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2737 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2739 if (sdkp
->max_unmap_blocks
)
2740 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2742 sd_config_discard(sdkp
, SD_LBP_WS16
);
2744 } else { /* LBP VPD page tells us what to use */
2745 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
&& !sdkp
->lbprz
)
2746 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2747 else if (sdkp
->lbpws
)
2748 sd_config_discard(sdkp
, SD_LBP_WS16
);
2749 else if (sdkp
->lbpws10
)
2750 sd_config_discard(sdkp
, SD_LBP_WS10
);
2751 else if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2752 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2754 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2763 * sd_read_block_characteristics - Query block dev. characteristics
2764 * @disk: disk to query
2766 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2768 struct request_queue
*q
= sdkp
->disk
->queue
;
2769 unsigned char *buffer
;
2771 const int vpd_len
= 64;
2773 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2776 /* Block Device Characteristics VPD */
2777 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2780 rot
= get_unaligned_be16(&buffer
[4]);
2783 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, q
);
2784 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM
, q
);
2787 if (sdkp
->device
->type
== TYPE_ZBC
) {
2789 q
->limits
.zoned
= BLK_ZONED_HM
;
2791 sdkp
->zoned
= (buffer
[8] >> 4) & 3;
2792 if (sdkp
->zoned
== 1)
2794 q
->limits
.zoned
= BLK_ZONED_HA
;
2797 * Treat drive-managed devices as
2798 * regular block devices.
2800 q
->limits
.zoned
= BLK_ZONED_NONE
;
2802 if (blk_queue_is_zoned(q
) && sdkp
->first_scan
)
2803 sd_printk(KERN_NOTICE
, sdkp
, "Host-%s zoned block device\n",
2804 q
->limits
.zoned
== BLK_ZONED_HM
? "managed" : "aware");
2811 * sd_read_block_provisioning - Query provisioning VPD page
2812 * @disk: disk to query
2814 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2816 unsigned char *buffer
;
2817 const int vpd_len
= 8;
2819 if (sdkp
->lbpme
== 0)
2822 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2824 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2828 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2829 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2830 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2836 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2838 struct scsi_device
*sdev
= sdkp
->device
;
2840 if (sdev
->host
->no_write_same
) {
2841 sdev
->no_write_same
= 1;
2846 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2847 /* too large values might cause issues with arcmsr */
2848 int vpd_buf_len
= 64;
2850 sdev
->no_report_opcodes
= 1;
2852 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2853 * CODES is unsupported and the device has an ATA
2854 * Information VPD page (SAT).
2856 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2857 sdev
->no_write_same
= 1;
2860 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2863 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2868 * sd_revalidate_disk - called the first time a new disk is seen,
2869 * performs disk spin up, read_capacity, etc.
2870 * @disk: struct gendisk we care about
2872 static int sd_revalidate_disk(struct gendisk
*disk
)
2874 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2875 struct scsi_device
*sdp
= sdkp
->device
;
2876 struct request_queue
*q
= sdkp
->disk
->queue
;
2877 sector_t old_capacity
= sdkp
->capacity
;
2878 unsigned char *buffer
;
2879 unsigned int dev_max
, rw_max
;
2881 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2882 "sd_revalidate_disk\n"));
2885 * If the device is offline, don't try and read capacity or any
2886 * of the other niceties.
2888 if (!scsi_device_online(sdp
))
2891 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2893 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2894 "allocation failure.\n");
2898 sd_spinup_disk(sdkp
);
2901 * Without media there is no reason to ask; moreover, some devices
2902 * react badly if we do.
2904 if (sdkp
->media_present
) {
2905 sd_read_capacity(sdkp
, buffer
);
2907 if (scsi_device_supports_vpd(sdp
)) {
2908 sd_read_block_provisioning(sdkp
);
2909 sd_read_block_limits(sdkp
);
2910 sd_read_block_characteristics(sdkp
);
2911 sd_zbc_read_zones(sdkp
, buffer
);
2914 sd_print_capacity(sdkp
, old_capacity
);
2916 sd_read_write_protect_flag(sdkp
, buffer
);
2917 sd_read_cache_type(sdkp
, buffer
);
2918 sd_read_app_tag_own(sdkp
, buffer
);
2919 sd_read_write_same(sdkp
, buffer
);
2922 sdkp
->first_scan
= 0;
2925 * We now have all cache related info, determine how we deal
2926 * with flush requests.
2928 sd_set_flush_flag(sdkp
);
2930 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2931 dev_max
= sdp
->use_16_for_rw
? SD_MAX_XFER_BLOCKS
: SD_DEF_XFER_BLOCKS
;
2933 /* Some devices report a maximum block count for READ/WRITE requests. */
2934 dev_max
= min_not_zero(dev_max
, sdkp
->max_xfer_blocks
);
2935 q
->limits
.max_dev_sectors
= logical_to_sectors(sdp
, dev_max
);
2938 * Use the device's preferred I/O size for reads and writes
2939 * unless the reported value is unreasonably small, large, or
2942 if (sdkp
->opt_xfer_blocks
&&
2943 sdkp
->opt_xfer_blocks
<= dev_max
&&
2944 sdkp
->opt_xfer_blocks
<= SD_DEF_XFER_BLOCKS
&&
2945 logical_to_bytes(sdp
, sdkp
->opt_xfer_blocks
) >= PAGE_SIZE
) {
2946 q
->limits
.io_opt
= logical_to_bytes(sdp
, sdkp
->opt_xfer_blocks
);
2947 rw_max
= logical_to_sectors(sdp
, sdkp
->opt_xfer_blocks
);
2949 rw_max
= BLK_DEF_MAX_SECTORS
;
2951 /* Combine with controller limits */
2952 q
->limits
.max_sectors
= min(rw_max
, queue_max_hw_sectors(q
));
2954 set_capacity(disk
, logical_to_sectors(sdp
, sdkp
->capacity
));
2955 sd_config_write_same(sdkp
);
2963 * sd_unlock_native_capacity - unlock native capacity
2964 * @disk: struct gendisk to set capacity for
2966 * Block layer calls this function if it detects that partitions
2967 * on @disk reach beyond the end of the device. If the SCSI host
2968 * implements ->unlock_native_capacity() method, it's invoked to
2969 * give it a chance to adjust the device capacity.
2972 * Defined by block layer. Might sleep.
2974 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2976 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2978 if (sdev
->host
->hostt
->unlock_native_capacity
)
2979 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2983 * sd_format_disk_name - format disk name
2984 * @prefix: name prefix - ie. "sd" for SCSI disks
2985 * @index: index of the disk to format name for
2986 * @buf: output buffer
2987 * @buflen: length of the output buffer
2989 * SCSI disk names starts at sda. The 26th device is sdz and the
2990 * 27th is sdaa. The last one for two lettered suffix is sdzz
2991 * which is followed by sdaaa.
2993 * This is basically 26 base counting with one extra 'nil' entry
2994 * at the beginning from the second digit on and can be
2995 * determined using similar method as 26 base conversion with the
2996 * index shifted -1 after each digit is computed.
3002 * 0 on success, -errno on failure.
3004 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
3006 const int base
= 'z' - 'a' + 1;
3007 char *begin
= buf
+ strlen(prefix
);
3008 char *end
= buf
+ buflen
;
3018 *--p
= 'a' + (index
% unit
);
3019 index
= (index
/ unit
) - 1;
3020 } while (index
>= 0);
3022 memmove(begin
, p
, end
- p
);
3023 memcpy(buf
, prefix
, strlen(prefix
));
3029 * The asynchronous part of sd_probe
3031 static void sd_probe_async(void *data
, async_cookie_t cookie
)
3033 struct scsi_disk
*sdkp
= data
;
3034 struct scsi_device
*sdp
;
3041 index
= sdkp
->index
;
3042 dev
= &sdp
->sdev_gendev
;
3044 gd
->major
= sd_major((index
& 0xf0) >> 4);
3045 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
3046 gd
->minors
= SD_MINORS
;
3048 gd
->fops
= &sd_fops
;
3049 gd
->private_data
= &sdkp
->driver
;
3050 gd
->queue
= sdkp
->device
->request_queue
;
3052 /* defaults, until the device tells us otherwise */
3053 sdp
->sector_size
= 512;
3055 sdkp
->media_present
= 1;
3056 sdkp
->write_prot
= 0;
3057 sdkp
->cache_override
= 0;
3061 sdkp
->first_scan
= 1;
3062 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
3064 sd_revalidate_disk(gd
);
3066 gd
->flags
= GENHD_FL_EXT_DEVT
;
3067 if (sdp
->removable
) {
3068 gd
->flags
|= GENHD_FL_REMOVABLE
;
3069 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
3072 blk_pm_runtime_init(sdp
->request_queue
, dev
);
3073 device_add_disk(dev
, gd
);
3075 sd_dif_config_host(sdkp
);
3077 sd_revalidate_disk(gd
);
3079 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
3080 sdp
->removable
? "removable " : "");
3081 scsi_autopm_put_device(sdp
);
3082 put_device(&sdkp
->dev
);
3086 * sd_probe - called during driver initialization and whenever a
3087 * new scsi device is attached to the system. It is called once
3088 * for each scsi device (not just disks) present.
3089 * @dev: pointer to device object
3091 * Returns 0 if successful (or not interested in this scsi device
3092 * (e.g. scanner)); 1 when there is an error.
3094 * Note: this function is invoked from the scsi mid-level.
3095 * This function sets up the mapping between a given
3096 * <host,channel,id,lun> (found in sdp) and new device name
3097 * (e.g. /dev/sda). More precisely it is the block device major
3098 * and minor number that is chosen here.
3100 * Assume sd_probe is not re-entrant (for time being)
3101 * Also think about sd_probe() and sd_remove() running coincidentally.
3103 static int sd_probe(struct device
*dev
)
3105 struct scsi_device
*sdp
= to_scsi_device(dev
);
3106 struct scsi_disk
*sdkp
;
3111 scsi_autopm_get_device(sdp
);
3113 if (sdp
->type
!= TYPE_DISK
&&
3114 sdp
->type
!= TYPE_ZBC
&&
3115 sdp
->type
!= TYPE_MOD
&&
3116 sdp
->type
!= TYPE_RBC
)
3119 #ifndef CONFIG_BLK_DEV_ZONED
3120 if (sdp
->type
== TYPE_ZBC
)
3123 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
3127 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
3131 gd
= alloc_disk(SD_MINORS
);
3136 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
3139 spin_lock(&sd_index_lock
);
3140 error
= ida_get_new(&sd_index_ida
, &index
);
3141 spin_unlock(&sd_index_lock
);
3142 } while (error
== -EAGAIN
);
3145 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
3149 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
3151 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
3152 goto out_free_index
;
3156 sdkp
->driver
= &sd_template
;
3158 sdkp
->index
= index
;
3159 atomic_set(&sdkp
->openers
, 0);
3160 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
3162 if (!sdp
->request_queue
->rq_timeout
) {
3163 if (sdp
->type
!= TYPE_MOD
)
3164 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
3166 blk_queue_rq_timeout(sdp
->request_queue
,
3170 device_initialize(&sdkp
->dev
);
3171 sdkp
->dev
.parent
= dev
;
3172 sdkp
->dev
.class = &sd_disk_class
;
3173 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
3175 error
= device_add(&sdkp
->dev
);
3177 goto out_free_index
;
3180 dev_set_drvdata(dev
, sdkp
);
3182 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
3183 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
3188 spin_lock(&sd_index_lock
);
3189 ida_remove(&sd_index_ida
, index
);
3190 spin_unlock(&sd_index_lock
);
3196 scsi_autopm_put_device(sdp
);
3201 * sd_remove - called whenever a scsi disk (previously recognized by
3202 * sd_probe) is detached from the system. It is called (potentially
3203 * multiple times) during sd module unload.
3204 * @sdp: pointer to mid level scsi device object
3206 * Note: this function is invoked from the scsi mid-level.
3207 * This function potentially frees up a device name (e.g. /dev/sdc)
3208 * that could be re-used by a subsequent sd_probe().
3209 * This function is not called when the built-in sd driver is "exit-ed".
3211 static int sd_remove(struct device
*dev
)
3213 struct scsi_disk
*sdkp
;
3216 sdkp
= dev_get_drvdata(dev
);
3217 devt
= disk_devt(sdkp
->disk
);
3218 scsi_autopm_get_device(sdkp
->device
);
3220 async_synchronize_full_domain(&scsi_sd_pm_domain
);
3221 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3222 device_del(&sdkp
->dev
);
3223 del_gendisk(sdkp
->disk
);
3226 sd_zbc_remove(sdkp
);
3228 blk_register_region(devt
, SD_MINORS
, NULL
,
3229 sd_default_probe
, NULL
, NULL
);
3231 mutex_lock(&sd_ref_mutex
);
3232 dev_set_drvdata(dev
, NULL
);
3233 put_device(&sdkp
->dev
);
3234 mutex_unlock(&sd_ref_mutex
);
3240 * scsi_disk_release - Called to free the scsi_disk structure
3241 * @dev: pointer to embedded class device
3243 * sd_ref_mutex must be held entering this routine. Because it is
3244 * called on last put, you should always use the scsi_disk_get()
3245 * scsi_disk_put() helpers which manipulate the semaphore directly
3246 * and never do a direct put_device.
3248 static void scsi_disk_release(struct device
*dev
)
3250 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3251 struct gendisk
*disk
= sdkp
->disk
;
3253 spin_lock(&sd_index_lock
);
3254 ida_remove(&sd_index_ida
, sdkp
->index
);
3255 spin_unlock(&sd_index_lock
);
3257 disk
->private_data
= NULL
;
3259 put_device(&sdkp
->device
->sdev_gendev
);
3264 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3266 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3267 struct scsi_sense_hdr sshdr
;
3268 struct scsi_device
*sdp
= sdkp
->device
;
3272 cmd
[4] |= 1; /* START */
3274 if (sdp
->start_stop_pwr_cond
)
3275 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3277 if (!scsi_device_online(sdp
))
3280 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3281 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, 0, RQF_PM
);
3283 sd_print_result(sdkp
, "Start/Stop Unit failed", res
);
3284 if (driver_byte(res
) & DRIVER_SENSE
)
3285 sd_print_sense_hdr(sdkp
, &sshdr
);
3286 if (scsi_sense_valid(&sshdr
) &&
3287 /* 0x3a is medium not present */
3292 /* SCSI error codes must not go to the generic layer */
3300 * Send a SYNCHRONIZE CACHE instruction down to the device through
3301 * the normal SCSI command structure. Wait for the command to
3304 static void sd_shutdown(struct device
*dev
)
3306 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3309 return; /* this can happen */
3311 if (pm_runtime_suspended(dev
))
3314 if (sdkp
->WCE
&& sdkp
->media_present
) {
3315 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3316 sd_sync_cache(sdkp
);
3319 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3320 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3321 sd_start_stop_device(sdkp
, 0);
3325 static int sd_suspend_common(struct device
*dev
, bool ignore_stop_errors
)
3327 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3330 if (!sdkp
) /* E.g.: runtime suspend following sd_remove() */
3333 if (sdkp
->WCE
&& sdkp
->media_present
) {
3334 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3335 ret
= sd_sync_cache(sdkp
);
3337 /* ignore OFFLINE device */
3344 if (sdkp
->device
->manage_start_stop
) {
3345 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3346 /* an error is not worth aborting a system sleep */
3347 ret
= sd_start_stop_device(sdkp
, 0);
3348 if (ignore_stop_errors
)
3356 static int sd_suspend_system(struct device
*dev
)
3358 return sd_suspend_common(dev
, true);
3361 static int sd_suspend_runtime(struct device
*dev
)
3363 return sd_suspend_common(dev
, false);
3366 static int sd_resume(struct device
*dev
)
3368 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3370 if (!sdkp
) /* E.g.: runtime resume at the start of sd_probe() */
3373 if (!sdkp
->device
->manage_start_stop
)
3376 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3377 return sd_start_stop_device(sdkp
, 1);
3381 * init_sd - entry point for this driver (both when built in or when
3384 * Note: this function registers this driver with the scsi mid-level.
3386 static int __init
init_sd(void)
3388 int majors
= 0, i
, err
;
3390 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3392 for (i
= 0; i
< SD_MAJORS
; i
++) {
3393 if (register_blkdev(sd_major(i
), "sd") != 0)
3396 blk_register_region(sd_major(i
), SD_MINORS
, NULL
,
3397 sd_default_probe
, NULL
, NULL
);
3403 err
= class_register(&sd_disk_class
);
3407 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3409 if (!sd_cdb_cache
) {
3410 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3415 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3417 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3422 err
= scsi_register_driver(&sd_template
.gendrv
);
3424 goto err_out_driver
;
3429 mempool_destroy(sd_cdb_pool
);
3432 kmem_cache_destroy(sd_cdb_cache
);
3435 class_unregister(&sd_disk_class
);
3437 for (i
= 0; i
< SD_MAJORS
; i
++)
3438 unregister_blkdev(sd_major(i
), "sd");
3443 * exit_sd - exit point for this driver (when it is a module).
3445 * Note: this function unregisters this driver from the scsi mid-level.
3447 static void __exit
exit_sd(void)
3451 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3453 scsi_unregister_driver(&sd_template
.gendrv
);
3454 mempool_destroy(sd_cdb_pool
);
3455 kmem_cache_destroy(sd_cdb_cache
);
3457 class_unregister(&sd_disk_class
);
3459 for (i
= 0; i
< SD_MAJORS
; i
++) {
3460 blk_unregister_region(sd_major(i
), SD_MINORS
);
3461 unregister_blkdev(sd_major(i
), "sd");
3465 module_init(init_sd
);
3466 module_exit(exit_sd
);
3468 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3469 struct scsi_sense_hdr
*sshdr
)
3471 scsi_print_sense_hdr(sdkp
->device
,
3472 sdkp
->disk
? sdkp
->disk
->disk_name
: NULL
, sshdr
);
3475 static void sd_print_result(const struct scsi_disk
*sdkp
, const char *msg
,
3478 const char *hb_string
= scsi_hostbyte_string(result
);
3479 const char *db_string
= scsi_driverbyte_string(result
);
3481 if (hb_string
|| db_string
)
3482 sd_printk(KERN_INFO
, sdkp
,
3483 "%s: Result: hostbyte=%s driverbyte=%s\n", msg
,
3484 hb_string
? hb_string
: "invalid",
3485 db_string
? db_string
: "invalid");
3487 sd_printk(KERN_INFO
, sdkp
,
3488 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3489 msg
, host_byte(result
), driver_byte(result
));