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 <asm/uaccess.h>
56 #include <asm/unaligned.h>
58 #include <scsi/scsi.h>
59 #include <scsi/scsi_cmnd.h>
60 #include <scsi/scsi_dbg.h>
61 #include <scsi/scsi_device.h>
62 #include <scsi/scsi_driver.h>
63 #include <scsi/scsi_eh.h>
64 #include <scsi/scsi_host.h>
65 #include <scsi/scsi_ioctl.h>
66 #include <scsi/scsicam.h>
69 #include "scsi_priv.h"
70 #include "scsi_logging.h"
72 MODULE_AUTHOR("Eric Youngdale");
73 MODULE_DESCRIPTION("SCSI disk (sd) driver");
74 MODULE_LICENSE("GPL");
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
96 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
102 static void sd_config_discard(struct scsi_disk
*, unsigned int);
103 static void sd_config_write_same(struct scsi_disk
*);
104 static int sd_revalidate_disk(struct gendisk
*);
105 static void sd_unlock_native_capacity(struct gendisk
*disk
);
106 static int sd_probe(struct device
*);
107 static int sd_remove(struct device
*);
108 static void sd_shutdown(struct device
*);
109 static int sd_suspend_system(struct device
*);
110 static int sd_suspend_runtime(struct device
*);
111 static int sd_resume(struct device
*);
112 static void sd_rescan(struct device
*);
113 static int sd_init_command(struct scsi_cmnd
*SCpnt
);
114 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
);
115 static int sd_done(struct scsi_cmnd
*);
116 static int sd_eh_action(struct scsi_cmnd
*, int);
117 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
118 static void scsi_disk_release(struct device
*cdev
);
119 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
120 static void sd_print_result(const struct scsi_disk
*, const char *, int);
122 static DEFINE_SPINLOCK(sd_index_lock
);
123 static DEFINE_IDA(sd_index_ida
);
125 /* This semaphore is used to mediate the 0->1 reference get in the
126 * face of object destruction (i.e. we can't allow a get on an
127 * object after last put) */
128 static DEFINE_MUTEX(sd_ref_mutex
);
130 static struct kmem_cache
*sd_cdb_cache
;
131 static mempool_t
*sd_cdb_pool
;
133 static const char *sd_cache_types
[] = {
134 "write through", "none", "write back",
135 "write back, no read (daft)"
138 static void sd_set_flush_flag(struct scsi_disk
*sdkp
)
148 blk_queue_flush(sdkp
->disk
->queue
, flush
);
152 cache_type_store(struct device
*dev
, struct device_attribute
*attr
,
153 const char *buf
, size_t count
)
155 int i
, ct
= -1, rcd
, wce
, sp
;
156 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
157 struct scsi_device
*sdp
= sdkp
->device
;
160 struct scsi_mode_data data
;
161 struct scsi_sense_hdr sshdr
;
162 static const char temp
[] = "temporary ";
165 if (sdp
->type
!= TYPE_DISK
)
166 /* no cache control on RBC devices; theoretically they
167 * can do it, but there's probably so many exceptions
168 * it's not worth the risk */
171 if (strncmp(buf
, temp
, sizeof(temp
) - 1) == 0) {
172 buf
+= sizeof(temp
) - 1;
173 sdkp
->cache_override
= 1;
175 sdkp
->cache_override
= 0;
178 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
179 len
= strlen(sd_cache_types
[i
]);
180 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
188 rcd
= ct
& 0x01 ? 1 : 0;
189 wce
= (ct
& 0x02) && !sdkp
->write_prot
? 1 : 0;
191 if (sdkp
->cache_override
) {
194 sd_set_flush_flag(sdkp
);
198 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
199 SD_MAX_RETRIES
, &data
, NULL
))
201 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
202 data
.block_descriptor_length
);
203 buffer_data
= buffer
+ data
.header_length
+
204 data
.block_descriptor_length
;
205 buffer_data
[2] &= ~0x05;
206 buffer_data
[2] |= wce
<< 2 | rcd
;
207 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
208 buffer_data
[0] &= ~0x80;
210 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
211 SD_MAX_RETRIES
, &data
, &sshdr
)) {
212 if (scsi_sense_valid(&sshdr
))
213 sd_print_sense_hdr(sdkp
, &sshdr
);
216 revalidate_disk(sdkp
->disk
);
221 manage_start_stop_show(struct device
*dev
, struct device_attribute
*attr
,
224 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
225 struct scsi_device
*sdp
= sdkp
->device
;
227 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
231 manage_start_stop_store(struct device
*dev
, struct device_attribute
*attr
,
232 const char *buf
, size_t count
)
234 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
235 struct scsi_device
*sdp
= sdkp
->device
;
237 if (!capable(CAP_SYS_ADMIN
))
240 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
244 static DEVICE_ATTR_RW(manage_start_stop
);
247 allow_restart_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
249 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
251 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
255 allow_restart_store(struct device
*dev
, struct device_attribute
*attr
,
256 const char *buf
, size_t count
)
258 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
259 struct scsi_device
*sdp
= sdkp
->device
;
261 if (!capable(CAP_SYS_ADMIN
))
264 if (sdp
->type
!= TYPE_DISK
)
267 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
271 static DEVICE_ATTR_RW(allow_restart
);
274 cache_type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
276 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
277 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
279 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
281 static DEVICE_ATTR_RW(cache_type
);
284 FUA_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
286 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
288 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
290 static DEVICE_ATTR_RO(FUA
);
293 protection_type_show(struct device
*dev
, struct device_attribute
*attr
,
296 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
298 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
302 protection_type_store(struct device
*dev
, struct device_attribute
*attr
,
303 const char *buf
, size_t count
)
305 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
309 if (!capable(CAP_SYS_ADMIN
))
312 err
= kstrtouint(buf
, 10, &val
);
317 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
318 sdkp
->protection_type
= val
;
322 static DEVICE_ATTR_RW(protection_type
);
325 protection_mode_show(struct device
*dev
, struct device_attribute
*attr
,
328 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
329 struct scsi_device
*sdp
= sdkp
->device
;
330 unsigned int dif
, dix
;
332 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
333 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
335 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
341 return snprintf(buf
, 20, "none\n");
343 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
345 static DEVICE_ATTR_RO(protection_mode
);
348 app_tag_own_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
350 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
352 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
354 static DEVICE_ATTR_RO(app_tag_own
);
357 thin_provisioning_show(struct device
*dev
, struct device_attribute
*attr
,
360 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
362 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
364 static DEVICE_ATTR_RO(thin_provisioning
);
366 static const char *lbp_mode
[] = {
367 [SD_LBP_FULL
] = "full",
368 [SD_LBP_UNMAP
] = "unmap",
369 [SD_LBP_WS16
] = "writesame_16",
370 [SD_LBP_WS10
] = "writesame_10",
371 [SD_LBP_ZERO
] = "writesame_zero",
372 [SD_LBP_DISABLE
] = "disabled",
376 provisioning_mode_show(struct device
*dev
, struct device_attribute
*attr
,
379 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
381 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
385 provisioning_mode_store(struct device
*dev
, struct device_attribute
*attr
,
386 const char *buf
, size_t count
)
388 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
389 struct scsi_device
*sdp
= sdkp
->device
;
391 if (!capable(CAP_SYS_ADMIN
))
394 if (sdp
->type
!= TYPE_DISK
)
397 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
398 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
399 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
400 sd_config_discard(sdkp
, SD_LBP_WS16
);
401 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
402 sd_config_discard(sdkp
, SD_LBP_WS10
);
403 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
404 sd_config_discard(sdkp
, SD_LBP_ZERO
);
405 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
406 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
412 static DEVICE_ATTR_RW(provisioning_mode
);
415 max_medium_access_timeouts_show(struct device
*dev
,
416 struct device_attribute
*attr
, char *buf
)
418 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
420 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
424 max_medium_access_timeouts_store(struct device
*dev
,
425 struct device_attribute
*attr
, const char *buf
,
428 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
431 if (!capable(CAP_SYS_ADMIN
))
434 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
436 return err
? err
: count
;
438 static DEVICE_ATTR_RW(max_medium_access_timeouts
);
441 max_write_same_blocks_show(struct device
*dev
, struct device_attribute
*attr
,
444 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
446 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
450 max_write_same_blocks_store(struct device
*dev
, struct device_attribute
*attr
,
451 const char *buf
, size_t count
)
453 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
454 struct scsi_device
*sdp
= sdkp
->device
;
458 if (!capable(CAP_SYS_ADMIN
))
461 if (sdp
->type
!= TYPE_DISK
)
464 err
= kstrtoul(buf
, 10, &max
);
470 sdp
->no_write_same
= 1;
471 else if (max
<= SD_MAX_WS16_BLOCKS
) {
472 sdp
->no_write_same
= 0;
473 sdkp
->max_ws_blocks
= max
;
476 sd_config_write_same(sdkp
);
480 static DEVICE_ATTR_RW(max_write_same_blocks
);
482 static struct attribute
*sd_disk_attrs
[] = {
483 &dev_attr_cache_type
.attr
,
485 &dev_attr_allow_restart
.attr
,
486 &dev_attr_manage_start_stop
.attr
,
487 &dev_attr_protection_type
.attr
,
488 &dev_attr_protection_mode
.attr
,
489 &dev_attr_app_tag_own
.attr
,
490 &dev_attr_thin_provisioning
.attr
,
491 &dev_attr_provisioning_mode
.attr
,
492 &dev_attr_max_write_same_blocks
.attr
,
493 &dev_attr_max_medium_access_timeouts
.attr
,
496 ATTRIBUTE_GROUPS(sd_disk
);
498 static struct class sd_disk_class
= {
500 .owner
= THIS_MODULE
,
501 .dev_release
= scsi_disk_release
,
502 .dev_groups
= sd_disk_groups
,
505 static const struct dev_pm_ops sd_pm_ops
= {
506 .suspend
= sd_suspend_system
,
508 .poweroff
= sd_suspend_system
,
509 .restore
= sd_resume
,
510 .runtime_suspend
= sd_suspend_runtime
,
511 .runtime_resume
= sd_resume
,
514 static struct scsi_driver sd_template
= {
517 .owner
= THIS_MODULE
,
520 .shutdown
= sd_shutdown
,
524 .init_command
= sd_init_command
,
525 .uninit_command
= sd_uninit_command
,
527 .eh_action
= sd_eh_action
,
531 * Dummy kobj_map->probe function.
532 * The default ->probe function will call modprobe, which is
533 * pointless as this module is already loaded.
535 static struct kobject
*sd_default_probe(dev_t devt
, int *partno
, void *data
)
541 * Device no to disk mapping:
543 * major disc2 disc p1
544 * |............|.............|....|....| <- dev_t
547 * Inside a major, we have 16k disks, however mapped non-
548 * contiguously. The first 16 disks are for major0, the next
549 * ones with major1, ... Disk 256 is for major0 again, disk 272
551 * As we stay compatible with our numbering scheme, we can reuse
552 * the well-know SCSI majors 8, 65--71, 136--143.
554 static int sd_major(int major_idx
)
558 return SCSI_DISK0_MAJOR
;
560 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
562 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
565 return 0; /* shut up gcc */
569 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
571 struct scsi_disk
*sdkp
= NULL
;
573 mutex_lock(&sd_ref_mutex
);
575 if (disk
->private_data
) {
576 sdkp
= scsi_disk(disk
);
577 if (scsi_device_get(sdkp
->device
) == 0)
578 get_device(&sdkp
->dev
);
582 mutex_unlock(&sd_ref_mutex
);
586 static void scsi_disk_put(struct scsi_disk
*sdkp
)
588 struct scsi_device
*sdev
= sdkp
->device
;
590 mutex_lock(&sd_ref_mutex
);
591 put_device(&sdkp
->dev
);
592 scsi_device_put(sdev
);
593 mutex_unlock(&sd_ref_mutex
);
596 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd
*scmd
,
597 unsigned int dix
, unsigned int dif
)
599 struct bio
*bio
= scmd
->request
->bio
;
600 unsigned int prot_op
= sd_prot_op(rq_data_dir(scmd
->request
), dix
, dif
);
601 unsigned int protect
= 0;
603 if (dix
) { /* DIX Type 0, 1, 2, 3 */
604 if (bio_integrity_flagged(bio
, BIP_IP_CHECKSUM
))
605 scmd
->prot_flags
|= SCSI_PROT_IP_CHECKSUM
;
607 if (bio_integrity_flagged(bio
, BIP_CTRL_NOCHECK
) == false)
608 scmd
->prot_flags
|= SCSI_PROT_GUARD_CHECK
;
611 if (dif
!= SD_DIF_TYPE3_PROTECTION
) { /* DIX/DIF Type 0, 1, 2 */
612 scmd
->prot_flags
|= SCSI_PROT_REF_INCREMENT
;
614 if (bio_integrity_flagged(bio
, BIP_CTRL_NOCHECK
) == false)
615 scmd
->prot_flags
|= SCSI_PROT_REF_CHECK
;
618 if (dif
) { /* DIX/DIF Type 1, 2, 3 */
619 scmd
->prot_flags
|= SCSI_PROT_TRANSFER_PI
;
621 if (bio_integrity_flagged(bio
, BIP_DISK_NOCHECK
))
622 protect
= 3 << 5; /* Disable target PI checking */
624 protect
= 1 << 5; /* Enable target PI checking */
627 scsi_set_prot_op(scmd
, prot_op
);
628 scsi_set_prot_type(scmd
, dif
);
629 scmd
->prot_flags
&= sd_prot_flag_mask(prot_op
);
634 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
636 struct request_queue
*q
= sdkp
->disk
->queue
;
637 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
638 unsigned int max_blocks
= 0;
640 q
->limits
.discard_zeroes_data
= 0;
641 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
643 q
->limits
.discard_granularity
=
644 max(sdkp
->physical_block_size
,
645 sdkp
->unmap_granularity
* logical_block_size
);
647 sdkp
->provisioning_mode
= mode
;
652 blk_queue_max_discard_sectors(q
, 0);
653 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
657 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
658 (u32
)SD_MAX_WS16_BLOCKS
);
662 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
663 (u32
)SD_MAX_WS16_BLOCKS
);
664 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
668 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
669 (u32
)SD_MAX_WS10_BLOCKS
);
670 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
674 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
675 (u32
)SD_MAX_WS10_BLOCKS
);
676 q
->limits
.discard_zeroes_data
= 1;
680 blk_queue_max_discard_sectors(q
, max_blocks
* (logical_block_size
>> 9));
681 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
685 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
686 * @sdp: scsi device to operate one
687 * @rq: Request to prepare
689 * Will issue either UNMAP or WRITE SAME(16) depending on preference
690 * indicated by target device.
692 static int sd_setup_discard_cmnd(struct scsi_cmnd
*cmd
)
694 struct request
*rq
= cmd
->request
;
695 struct scsi_device
*sdp
= cmd
->device
;
696 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
697 sector_t sector
= blk_rq_pos(rq
);
698 unsigned int nr_sectors
= blk_rq_sectors(rq
);
699 unsigned int nr_bytes
= blk_rq_bytes(rq
);
705 sector
>>= ilog2(sdp
->sector_size
) - 9;
706 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
708 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
710 return BLKPREP_DEFER
;
712 switch (sdkp
->provisioning_mode
) {
714 buf
= page_address(page
);
717 cmd
->cmnd
[0] = UNMAP
;
720 put_unaligned_be16(6 + 16, &buf
[0]);
721 put_unaligned_be16(16, &buf
[2]);
722 put_unaligned_be64(sector
, &buf
[8]);
723 put_unaligned_be32(nr_sectors
, &buf
[16]);
730 cmd
->cmnd
[0] = WRITE_SAME_16
;
731 cmd
->cmnd
[1] = 0x8; /* UNMAP */
732 put_unaligned_be64(sector
, &cmd
->cmnd
[2]);
733 put_unaligned_be32(nr_sectors
, &cmd
->cmnd
[10]);
735 len
= sdkp
->device
->sector_size
;
741 cmd
->cmnd
[0] = WRITE_SAME
;
742 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
743 cmd
->cmnd
[1] = 0x8; /* UNMAP */
744 put_unaligned_be32(sector
, &cmd
->cmnd
[2]);
745 put_unaligned_be16(nr_sectors
, &cmd
->cmnd
[7]);
747 len
= sdkp
->device
->sector_size
;
755 rq
->completion_data
= page
;
756 rq
->timeout
= SD_TIMEOUT
;
758 cmd
->transfersize
= len
;
759 cmd
->allowed
= SD_MAX_RETRIES
;
762 * Initially __data_len is set to the amount of data that needs to be
763 * transferred to the target. This amount depends on whether WRITE SAME
764 * or UNMAP is being used. After the scatterlist has been mapped by
765 * scsi_init_io() we set __data_len to the size of the area to be
766 * discarded on disk. This allows us to report completion on the full
767 * amount of blocks described by the request.
769 blk_add_request_payload(rq
, page
, len
);
770 ret
= scsi_init_io(cmd
);
771 rq
->__data_len
= nr_bytes
;
774 if (ret
!= BLKPREP_OK
)
779 static void sd_config_write_same(struct scsi_disk
*sdkp
)
781 struct request_queue
*q
= sdkp
->disk
->queue
;
782 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
784 if (sdkp
->device
->no_write_same
) {
785 sdkp
->max_ws_blocks
= 0;
789 /* Some devices can not handle block counts above 0xffff despite
790 * supporting WRITE SAME(16). Consequently we default to 64k
791 * blocks per I/O unless the device explicitly advertises a
794 if (sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
795 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
796 (u32
)SD_MAX_WS16_BLOCKS
);
797 else if (sdkp
->ws16
|| sdkp
->ws10
|| sdkp
->device
->no_report_opcodes
)
798 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
799 (u32
)SD_MAX_WS10_BLOCKS
);
801 sdkp
->device
->no_write_same
= 1;
802 sdkp
->max_ws_blocks
= 0;
806 blk_queue_max_write_same_sectors(q
, sdkp
->max_ws_blocks
*
807 (logical_block_size
>> 9));
811 * sd_setup_write_same_cmnd - write the same data to multiple blocks
812 * @cmd: command to prepare
814 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
815 * preference indicated by target device.
817 static int sd_setup_write_same_cmnd(struct scsi_cmnd
*cmd
)
819 struct request
*rq
= cmd
->request
;
820 struct scsi_device
*sdp
= cmd
->device
;
821 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
822 struct bio
*bio
= rq
->bio
;
823 sector_t sector
= blk_rq_pos(rq
);
824 unsigned int nr_sectors
= blk_rq_sectors(rq
);
825 unsigned int nr_bytes
= blk_rq_bytes(rq
);
828 if (sdkp
->device
->no_write_same
)
831 BUG_ON(bio_offset(bio
) || bio_iovec(bio
).bv_len
!= sdp
->sector_size
);
833 sector
>>= ilog2(sdp
->sector_size
) - 9;
834 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
836 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
838 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
840 cmd
->cmnd
[0] = WRITE_SAME_16
;
841 put_unaligned_be64(sector
, &cmd
->cmnd
[2]);
842 put_unaligned_be32(nr_sectors
, &cmd
->cmnd
[10]);
845 cmd
->cmnd
[0] = WRITE_SAME
;
846 put_unaligned_be32(sector
, &cmd
->cmnd
[2]);
847 put_unaligned_be16(nr_sectors
, &cmd
->cmnd
[7]);
850 cmd
->transfersize
= sdp
->sector_size
;
851 cmd
->allowed
= SD_MAX_RETRIES
;
854 * For WRITE_SAME the data transferred in the DATA IN buffer is
855 * different from the amount of data actually written to the target.
857 * We set up __data_len to the amount of data transferred from the
858 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
859 * to transfer a single sector of data first, but then reset it to
860 * the amount of data to be written right after so that the I/O path
861 * knows how much to actually write.
863 rq
->__data_len
= sdp
->sector_size
;
864 ret
= scsi_init_io(cmd
);
865 rq
->__data_len
= nr_bytes
;
869 static int sd_setup_flush_cmnd(struct scsi_cmnd
*cmd
)
871 struct request
*rq
= cmd
->request
;
873 /* flush requests don't perform I/O, zero the S/G table */
874 memset(&cmd
->sdb
, 0, sizeof(cmd
->sdb
));
876 cmd
->cmnd
[0] = SYNCHRONIZE_CACHE
;
878 cmd
->transfersize
= 0;
879 cmd
->allowed
= SD_MAX_RETRIES
;
881 rq
->timeout
= rq
->q
->rq_timeout
* SD_FLUSH_TIMEOUT_MULTIPLIER
;
885 static int sd_setup_read_write_cmnd(struct scsi_cmnd
*SCpnt
)
887 struct request
*rq
= SCpnt
->request
;
888 struct scsi_device
*sdp
= SCpnt
->device
;
889 struct gendisk
*disk
= rq
->rq_disk
;
890 struct scsi_disk
*sdkp
;
891 sector_t block
= blk_rq_pos(rq
);
893 unsigned int this_count
= blk_rq_sectors(rq
);
894 unsigned int dif
, dix
;
896 unsigned char protect
;
898 ret
= scsi_init_io(SCpnt
);
899 if (ret
!= BLKPREP_OK
)
902 sdkp
= scsi_disk(disk
);
904 /* from here on until we're complete, any goto out
905 * is used for a killable error condition */
909 scmd_printk(KERN_INFO
, SCpnt
,
910 "%s: block=%llu, count=%d\n",
911 __func__
, (unsigned long long)block
, this_count
));
913 if (!sdp
|| !scsi_device_online(sdp
) ||
914 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
915 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
916 "Finishing %u sectors\n",
917 blk_rq_sectors(rq
)));
918 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
919 "Retry with 0x%p\n", SCpnt
));
925 * quietly refuse to do anything to a changed disc until
926 * the changed bit has been reset
928 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
933 * Some SD card readers can't handle multi-sector accesses which touch
934 * the last one or two hardware sectors. Split accesses as needed.
936 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
937 (sdp
->sector_size
/ 512);
939 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
940 if (block
< threshold
) {
941 /* Access up to the threshold but not beyond */
942 this_count
= threshold
- block
;
944 /* Access only a single hardware sector */
945 this_count
= sdp
->sector_size
/ 512;
949 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
950 (unsigned long long)block
));
953 * If we have a 1K hardware sectorsize, prevent access to single
954 * 512 byte sectors. In theory we could handle this - in fact
955 * the scsi cdrom driver must be able to handle this because
956 * we typically use 1K blocksizes, and cdroms typically have
957 * 2K hardware sectorsizes. Of course, things are simpler
958 * with the cdrom, since it is read-only. For performance
959 * reasons, the filesystems should be able to handle this
960 * and not force the scsi disk driver to use bounce buffers
963 if (sdp
->sector_size
== 1024) {
964 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
965 scmd_printk(KERN_ERR
, SCpnt
,
966 "Bad block number requested\n");
970 this_count
= this_count
>> 1;
973 if (sdp
->sector_size
== 2048) {
974 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
975 scmd_printk(KERN_ERR
, SCpnt
,
976 "Bad block number requested\n");
980 this_count
= this_count
>> 2;
983 if (sdp
->sector_size
== 4096) {
984 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
985 scmd_printk(KERN_ERR
, SCpnt
,
986 "Bad block number requested\n");
990 this_count
= this_count
>> 3;
993 if (rq_data_dir(rq
) == WRITE
) {
994 SCpnt
->cmnd
[0] = WRITE_6
;
996 if (blk_integrity_rq(rq
))
997 sd_dif_prepare(SCpnt
);
999 } else if (rq_data_dir(rq
) == READ
) {
1000 SCpnt
->cmnd
[0] = READ_6
;
1002 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %llx\n", (unsigned long long) rq
->cmd_flags
);
1006 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
1007 "%s %d/%u 512 byte blocks.\n",
1008 (rq_data_dir(rq
) == WRITE
) ?
1009 "writing" : "reading", this_count
,
1010 blk_rq_sectors(rq
)));
1012 dix
= scsi_prot_sg_count(SCpnt
);
1013 dif
= scsi_host_dif_capable(SCpnt
->device
->host
, sdkp
->protection_type
);
1016 protect
= sd_setup_protect_cmnd(SCpnt
, dix
, dif
);
1020 if (protect
&& sdkp
->protection_type
== SD_DIF_TYPE2_PROTECTION
) {
1021 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1023 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1024 ret
= BLKPREP_DEFER
;
1028 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1029 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1030 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1031 SCpnt
->cmnd
[7] = 0x18;
1032 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1033 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1036 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1037 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1038 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1039 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1040 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1041 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1042 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1043 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1045 /* Expected Indirect LBA */
1046 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1047 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1048 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1049 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1051 /* Transfer length */
1052 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1053 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1054 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1055 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1056 } else if (sdp
->use_16_for_rw
|| (this_count
> 0xffff)) {
1057 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1058 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1059 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1060 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1061 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1062 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1063 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1064 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1065 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1066 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1067 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1068 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1069 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1070 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1071 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1072 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1073 scsi_device_protection(SCpnt
->device
) ||
1074 SCpnt
->device
->use_10_for_rw
) {
1075 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1076 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1077 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1078 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1079 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1080 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1081 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1082 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1083 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1085 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1087 * This happens only if this drive failed
1088 * 10byte rw command with ILLEGAL_REQUEST
1089 * during operation and thus turned off
1092 scmd_printk(KERN_ERR
, SCpnt
,
1093 "FUA write on READ/WRITE(6) drive\n");
1097 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1098 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1099 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1100 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1103 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1106 * We shouldn't disconnect in the middle of a sector, so with a dumb
1107 * host adapter, it's safe to assume that we can at least transfer
1108 * this many bytes between each connect / disconnect.
1110 SCpnt
->transfersize
= sdp
->sector_size
;
1111 SCpnt
->underflow
= this_count
<< 9;
1112 SCpnt
->allowed
= SD_MAX_RETRIES
;
1115 * This indicates that the command is ready from our end to be
1123 static int sd_init_command(struct scsi_cmnd
*cmd
)
1125 struct request
*rq
= cmd
->request
;
1127 if (rq
->cmd_flags
& REQ_DISCARD
)
1128 return sd_setup_discard_cmnd(cmd
);
1129 else if (rq
->cmd_flags
& REQ_WRITE_SAME
)
1130 return sd_setup_write_same_cmnd(cmd
);
1131 else if (rq
->cmd_flags
& REQ_FLUSH
)
1132 return sd_setup_flush_cmnd(cmd
);
1134 return sd_setup_read_write_cmnd(cmd
);
1137 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
)
1139 struct request
*rq
= SCpnt
->request
;
1141 if (rq
->cmd_flags
& REQ_DISCARD
)
1142 __free_page(rq
->completion_data
);
1144 if (SCpnt
->cmnd
!= rq
->cmd
) {
1145 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1152 * sd_open - open a scsi disk device
1153 * @inode: only i_rdev member may be used
1154 * @filp: only f_mode and f_flags may be used
1156 * Returns 0 if successful. Returns a negated errno value in case
1159 * Note: This can be called from a user context (e.g. fsck(1) )
1160 * or from within the kernel (e.g. as a result of a mount(1) ).
1161 * In the latter case @inode and @filp carry an abridged amount
1162 * of information as noted above.
1164 * Locking: called with bdev->bd_mutex held.
1166 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1168 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1169 struct scsi_device
*sdev
;
1175 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1177 sdev
= sdkp
->device
;
1180 * If the device is in error recovery, wait until it is done.
1181 * If the device is offline, then disallow any access to it.
1184 if (!scsi_block_when_processing_errors(sdev
))
1187 if (sdev
->removable
|| sdkp
->write_prot
)
1188 check_disk_change(bdev
);
1191 * If the drive is empty, just let the open fail.
1193 retval
= -ENOMEDIUM
;
1194 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1198 * If the device has the write protect tab set, have the open fail
1199 * if the user expects to be able to write to the thing.
1202 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1206 * It is possible that the disk changing stuff resulted in
1207 * the device being taken offline. If this is the case,
1208 * report this to the user, and don't pretend that the
1209 * open actually succeeded.
1212 if (!scsi_device_online(sdev
))
1215 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1216 if (scsi_block_when_processing_errors(sdev
))
1217 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1223 scsi_disk_put(sdkp
);
1228 * sd_release - invoked when the (last) close(2) is called on this
1230 * @inode: only i_rdev member may be used
1231 * @filp: only f_mode and f_flags may be used
1235 * Note: may block (uninterruptible) if error recovery is underway
1238 * Locking: called with bdev->bd_mutex held.
1240 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1242 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1243 struct scsi_device
*sdev
= sdkp
->device
;
1245 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1247 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1248 if (scsi_block_when_processing_errors(sdev
))
1249 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1253 * XXX and what if there are packets in flight and this close()
1254 * XXX is followed by a "rmmod sd_mod"?
1257 scsi_disk_put(sdkp
);
1260 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1262 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1263 struct scsi_device
*sdp
= sdkp
->device
;
1264 struct Scsi_Host
*host
= sdp
->host
;
1267 /* default to most commonly used values */
1268 diskinfo
[0] = 0x40; /* 1 << 6 */
1269 diskinfo
[1] = 0x20; /* 1 << 5 */
1270 diskinfo
[2] = sdkp
->capacity
>> 11;
1272 /* override with calculated, extended default, or driver values */
1273 if (host
->hostt
->bios_param
)
1274 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1276 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1278 geo
->heads
= diskinfo
[0];
1279 geo
->sectors
= diskinfo
[1];
1280 geo
->cylinders
= diskinfo
[2];
1285 * sd_ioctl - process an ioctl
1286 * @inode: only i_rdev/i_bdev members may be used
1287 * @filp: only f_mode and f_flags may be used
1288 * @cmd: ioctl command number
1289 * @arg: this is third argument given to ioctl(2) system call.
1290 * Often contains a pointer.
1292 * Returns 0 if successful (some ioctls return positive numbers on
1293 * success as well). Returns a negated errno value in case of error.
1295 * Note: most ioctls are forward onto the block subsystem or further
1296 * down in the scsi subsystem.
1298 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1299 unsigned int cmd
, unsigned long arg
)
1301 struct gendisk
*disk
= bdev
->bd_disk
;
1302 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1303 struct scsi_device
*sdp
= sdkp
->device
;
1304 void __user
*p
= (void __user
*)arg
;
1307 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1308 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1310 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1315 * If we are in the middle of error recovery, don't let anyone
1316 * else try and use this device. Also, if error recovery fails, it
1317 * may try and take the device offline, in which case all further
1318 * access to the device is prohibited.
1320 error
= scsi_ioctl_block_when_processing_errors(sdp
, cmd
,
1321 (mode
& FMODE_NDELAY
) != 0);
1326 * Send SCSI addressing ioctls directly to mid level, send other
1327 * ioctls to block level and then onto mid level if they can't be
1331 case SCSI_IOCTL_GET_IDLUN
:
1332 case SCSI_IOCTL_GET_BUS_NUMBER
:
1333 error
= scsi_ioctl(sdp
, cmd
, p
);
1336 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1337 if (error
!= -ENOTTY
)
1339 error
= scsi_ioctl(sdp
, cmd
, p
);
1346 static void set_media_not_present(struct scsi_disk
*sdkp
)
1348 if (sdkp
->media_present
)
1349 sdkp
->device
->changed
= 1;
1351 if (sdkp
->device
->removable
) {
1352 sdkp
->media_present
= 0;
1357 static int media_not_present(struct scsi_disk
*sdkp
,
1358 struct scsi_sense_hdr
*sshdr
)
1360 if (!scsi_sense_valid(sshdr
))
1363 /* not invoked for commands that could return deferred errors */
1364 switch (sshdr
->sense_key
) {
1365 case UNIT_ATTENTION
:
1367 /* medium not present */
1368 if (sshdr
->asc
== 0x3A) {
1369 set_media_not_present(sdkp
);
1377 * sd_check_events - check media events
1378 * @disk: kernel device descriptor
1379 * @clearing: disk events currently being cleared
1381 * Returns mask of DISK_EVENT_*.
1383 * Note: this function is invoked from the block subsystem.
1385 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1387 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1388 struct scsi_device
*sdp
= sdkp
->device
;
1389 struct scsi_sense_hdr
*sshdr
= NULL
;
1392 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1395 * If the device is offline, don't send any commands - just pretend as
1396 * if the command failed. If the device ever comes back online, we
1397 * can deal with it then. It is only because of unrecoverable errors
1398 * that we would ever take a device offline in the first place.
1400 if (!scsi_device_online(sdp
)) {
1401 set_media_not_present(sdkp
);
1406 * Using TEST_UNIT_READY enables differentiation between drive with
1407 * no cartridge loaded - NOT READY, drive with changed cartridge -
1408 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1410 * Drives that auto spin down. eg iomega jaz 1G, will be started
1411 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1412 * sd_revalidate() is called.
1416 if (scsi_block_when_processing_errors(sdp
)) {
1417 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1418 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1422 /* failed to execute TUR, assume media not present */
1423 if (host_byte(retval
)) {
1424 set_media_not_present(sdkp
);
1428 if (media_not_present(sdkp
, sshdr
))
1432 * For removable scsi disk we have to recognise the presence
1433 * of a disk in the drive.
1435 if (!sdkp
->media_present
)
1437 sdkp
->media_present
= 1;
1440 * sdp->changed is set under the following conditions:
1442 * Medium present state has changed in either direction.
1443 * Device has indicated UNIT_ATTENTION.
1446 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1451 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1454 struct scsi_device
*sdp
= sdkp
->device
;
1455 const int timeout
= sdp
->request_queue
->rq_timeout
1456 * SD_FLUSH_TIMEOUT_MULTIPLIER
;
1457 struct scsi_sense_hdr sshdr
;
1459 if (!scsi_device_online(sdp
))
1462 for (retries
= 3; retries
> 0; --retries
) {
1463 unsigned char cmd
[10] = { 0 };
1465 cmd
[0] = SYNCHRONIZE_CACHE
;
1467 * Leave the rest of the command zero to indicate
1470 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1471 &sshdr
, timeout
, SD_MAX_RETRIES
,
1478 sd_print_result(sdkp
, "Synchronize Cache(10) failed", res
);
1480 if (driver_byte(res
) & DRIVER_SENSE
)
1481 sd_print_sense_hdr(sdkp
, &sshdr
);
1482 /* we need to evaluate the error return */
1483 if (scsi_sense_valid(&sshdr
) &&
1484 (sshdr
.asc
== 0x3a || /* medium not present */
1485 sshdr
.asc
== 0x20)) /* invalid command */
1486 /* this is no error here */
1489 switch (host_byte(res
)) {
1490 /* ignore errors due to racing a disconnection */
1491 case DID_BAD_TARGET
:
1492 case DID_NO_CONNECT
:
1494 /* signal the upper layer it might try again */
1498 case DID_SOFT_ERROR
:
1507 static void sd_rescan(struct device
*dev
)
1509 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1511 revalidate_disk(sdkp
->disk
);
1515 #ifdef CONFIG_COMPAT
1517 * This gets directly called from VFS. When the ioctl
1518 * is not recognized we go back to the other translation paths.
1520 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1521 unsigned int cmd
, unsigned long arg
)
1523 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1526 error
= scsi_ioctl_block_when_processing_errors(sdev
, cmd
,
1527 (mode
& FMODE_NDELAY
) != 0);
1532 * Let the static ioctl translation table take care of it.
1534 if (!sdev
->host
->hostt
->compat_ioctl
)
1535 return -ENOIOCTLCMD
;
1536 return sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1540 static char sd_pr_type(enum pr_type type
)
1543 case PR_WRITE_EXCLUSIVE
:
1545 case PR_EXCLUSIVE_ACCESS
:
1547 case PR_WRITE_EXCLUSIVE_REG_ONLY
:
1549 case PR_EXCLUSIVE_ACCESS_REG_ONLY
:
1551 case PR_WRITE_EXCLUSIVE_ALL_REGS
:
1553 case PR_EXCLUSIVE_ACCESS_ALL_REGS
:
1560 static int sd_pr_command(struct block_device
*bdev
, u8 sa
,
1561 u64 key
, u64 sa_key
, u8 type
, u8 flags
)
1563 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1564 struct scsi_sense_hdr sshdr
;
1566 u8 cmd
[16] = { 0, };
1567 u8 data
[24] = { 0, };
1569 cmd
[0] = PERSISTENT_RESERVE_OUT
;
1572 put_unaligned_be32(sizeof(data
), &cmd
[5]);
1574 put_unaligned_be64(key
, &data
[0]);
1575 put_unaligned_be64(sa_key
, &data
[8]);
1578 result
= scsi_execute_req(sdev
, cmd
, DMA_TO_DEVICE
, &data
, sizeof(data
),
1579 &sshdr
, SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1581 if ((driver_byte(result
) & DRIVER_SENSE
) &&
1582 (scsi_sense_valid(&sshdr
))) {
1583 sdev_printk(KERN_INFO
, sdev
, "PR command failed: %d\n", result
);
1584 scsi_print_sense_hdr(sdev
, NULL
, &sshdr
);
1590 static int sd_pr_register(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1593 if (flags
& ~PR_FL_IGNORE_KEY
)
1595 return sd_pr_command(bdev
, (flags
& PR_FL_IGNORE_KEY
) ? 0x06 : 0x00,
1596 old_key
, new_key
, 0,
1597 (1 << 0) /* APTPL */ |
1598 (1 << 2) /* ALL_TG_PT */);
1601 static int sd_pr_reserve(struct block_device
*bdev
, u64 key
, enum pr_type type
,
1606 return sd_pr_command(bdev
, 0x01, key
, 0, sd_pr_type(type
), 0);
1609 static int sd_pr_release(struct block_device
*bdev
, u64 key
, enum pr_type type
)
1611 return sd_pr_command(bdev
, 0x02, key
, 0, sd_pr_type(type
), 0);
1614 static int sd_pr_preempt(struct block_device
*bdev
, u64 old_key
, u64 new_key
,
1615 enum pr_type type
, bool abort
)
1617 return sd_pr_command(bdev
, abort
? 0x05 : 0x04, old_key
, new_key
,
1618 sd_pr_type(type
), 0);
1621 static int sd_pr_clear(struct block_device
*bdev
, u64 key
)
1623 return sd_pr_command(bdev
, 0x03, key
, 0, 0, 0);
1626 static const struct pr_ops sd_pr_ops
= {
1627 .pr_register
= sd_pr_register
,
1628 .pr_reserve
= sd_pr_reserve
,
1629 .pr_release
= sd_pr_release
,
1630 .pr_preempt
= sd_pr_preempt
,
1631 .pr_clear
= sd_pr_clear
,
1634 static const struct block_device_operations sd_fops
= {
1635 .owner
= THIS_MODULE
,
1637 .release
= sd_release
,
1639 .getgeo
= sd_getgeo
,
1640 #ifdef CONFIG_COMPAT
1641 .compat_ioctl
= sd_compat_ioctl
,
1643 .check_events
= sd_check_events
,
1644 .revalidate_disk
= sd_revalidate_disk
,
1645 .unlock_native_capacity
= sd_unlock_native_capacity
,
1646 .pr_ops
= &sd_pr_ops
,
1650 * sd_eh_action - error handling callback
1651 * @scmd: sd-issued command that has failed
1652 * @eh_disp: The recovery disposition suggested by the midlayer
1654 * This function is called by the SCSI midlayer upon completion of an
1655 * error test command (currently TEST UNIT READY). The result of sending
1656 * the eh command is passed in eh_disp. We're looking for devices that
1657 * fail medium access commands but are OK with non access commands like
1658 * test unit ready (so wrongly see the device as having a successful
1661 static int sd_eh_action(struct scsi_cmnd
*scmd
, int eh_disp
)
1663 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1665 if (!scsi_device_online(scmd
->device
) ||
1666 !scsi_medium_access_command(scmd
) ||
1667 host_byte(scmd
->result
) != DID_TIME_OUT
||
1672 * The device has timed out executing a medium access command.
1673 * However, the TEST UNIT READY command sent during error
1674 * handling completed successfully. Either the device is in the
1675 * process of recovering or has it suffered an internal failure
1676 * that prevents access to the storage medium.
1678 sdkp
->medium_access_timed_out
++;
1681 * If the device keeps failing read/write commands but TEST UNIT
1682 * READY always completes successfully we assume that medium
1683 * access is no longer possible and take the device offline.
1685 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1686 scmd_printk(KERN_ERR
, scmd
,
1687 "Medium access timeout failure. Offlining disk!\n");
1688 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1696 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1698 u64 start_lba
= blk_rq_pos(scmd
->request
);
1699 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1700 u64 factor
= scmd
->device
->sector_size
/ 512;
1704 * resid is optional but mostly filled in. When it's unused,
1705 * its value is zero, so we assume the whole buffer transferred
1707 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1708 unsigned int good_bytes
;
1710 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1713 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1714 SCSI_SENSE_BUFFERSIZE
,
1719 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1722 /* be careful ... don't want any overflows */
1723 do_div(start_lba
, factor
);
1724 do_div(end_lba
, factor
);
1726 /* The bad lba was reported incorrectly, we have no idea where
1729 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1732 /* This computation should always be done in terms of
1733 * the resolution of the device's medium.
1735 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1736 return min(good_bytes
, transferred
);
1740 * sd_done - bottom half handler: called when the lower level
1741 * driver has completed (successfully or otherwise) a scsi command.
1742 * @SCpnt: mid-level's per command structure.
1744 * Note: potentially run from within an ISR. Must not block.
1746 static int sd_done(struct scsi_cmnd
*SCpnt
)
1748 int result
= SCpnt
->result
;
1749 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1750 struct scsi_sense_hdr sshdr
;
1751 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1752 struct request
*req
= SCpnt
->request
;
1753 int sense_valid
= 0;
1754 int sense_deferred
= 0;
1755 unsigned char op
= SCpnt
->cmnd
[0];
1756 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1758 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1760 good_bytes
= blk_rq_bytes(req
);
1761 scsi_set_resid(SCpnt
, 0);
1764 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1769 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1771 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1773 sdkp
->medium_access_timed_out
= 0;
1775 if (driver_byte(result
) != DRIVER_SENSE
&&
1776 (!sense_valid
|| sense_deferred
))
1779 switch (sshdr
.sense_key
) {
1780 case HARDWARE_ERROR
:
1782 good_bytes
= sd_completed_bytes(SCpnt
);
1784 case RECOVERED_ERROR
:
1785 good_bytes
= scsi_bufflen(SCpnt
);
1788 /* This indicates a false check condition, so ignore it. An
1789 * unknown amount of data was transferred so treat it as an
1793 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1795 case ABORTED_COMMAND
:
1796 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1797 good_bytes
= sd_completed_bytes(SCpnt
);
1799 case ILLEGAL_REQUEST
:
1800 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1801 good_bytes
= sd_completed_bytes(SCpnt
);
1802 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1803 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1806 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1811 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1813 sdkp
->device
->no_write_same
= 1;
1814 sd_config_write_same(sdkp
);
1817 req
->__data_len
= blk_rq_bytes(req
);
1818 req
->cmd_flags
|= REQ_QUIET
;
1827 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1828 "sd_done: completed %d of %d bytes\n",
1829 good_bytes
, scsi_bufflen(SCpnt
)));
1831 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1832 sd_dif_complete(SCpnt
, good_bytes
);
1838 * spinup disk - called only in sd_revalidate_disk()
1841 sd_spinup_disk(struct scsi_disk
*sdkp
)
1843 unsigned char cmd
[10];
1844 unsigned long spintime_expire
= 0;
1845 int retries
, spintime
;
1846 unsigned int the_result
;
1847 struct scsi_sense_hdr sshdr
;
1848 int sense_valid
= 0;
1852 /* Spin up drives, as required. Only do this at boot time */
1853 /* Spinup needs to be done for module loads too. */
1858 cmd
[0] = TEST_UNIT_READY
;
1859 memset((void *) &cmd
[1], 0, 9);
1861 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1864 SD_MAX_RETRIES
, NULL
);
1867 * If the drive has indicated to us that it
1868 * doesn't have any media in it, don't bother
1869 * with any more polling.
1871 if (media_not_present(sdkp
, &sshdr
))
1875 sense_valid
= scsi_sense_valid(&sshdr
);
1877 } while (retries
< 3 &&
1878 (!scsi_status_is_good(the_result
) ||
1879 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1880 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1882 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1883 /* no sense, TUR either succeeded or failed
1884 * with a status error */
1885 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1886 sd_print_result(sdkp
, "Test Unit Ready failed",
1893 * The device does not want the automatic start to be issued.
1895 if (sdkp
->device
->no_start_on_add
)
1898 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1899 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1900 break; /* manual intervention required */
1901 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1902 break; /* standby */
1903 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1904 break; /* unavailable */
1906 * Issue command to spin up drive when not ready
1909 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1910 cmd
[0] = START_STOP
;
1911 cmd
[1] = 1; /* Return immediately */
1912 memset((void *) &cmd
[2], 0, 8);
1913 cmd
[4] = 1; /* Start spin cycle */
1914 if (sdkp
->device
->start_stop_pwr_cond
)
1916 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1918 SD_TIMEOUT
, SD_MAX_RETRIES
,
1920 spintime_expire
= jiffies
+ 100 * HZ
;
1923 /* Wait 1 second for next try */
1928 * Wait for USB flash devices with slow firmware.
1929 * Yes, this sense key/ASC combination shouldn't
1930 * occur here. It's characteristic of these devices.
1932 } else if (sense_valid
&&
1933 sshdr
.sense_key
== UNIT_ATTENTION
&&
1934 sshdr
.asc
== 0x28) {
1936 spintime_expire
= jiffies
+ 5 * HZ
;
1939 /* Wait 1 second for next try */
1942 /* we don't understand the sense code, so it's
1943 * probably pointless to loop */
1945 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1946 sd_print_sense_hdr(sdkp
, &sshdr
);
1951 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1954 if (scsi_status_is_good(the_result
))
1957 printk("not responding...\n");
1963 * Determine whether disk supports Data Integrity Field.
1965 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1967 struct scsi_device
*sdp
= sdkp
->device
;
1971 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1974 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1976 if (type
> SD_DIF_TYPE3_PROTECTION
)
1978 else if (scsi_host_dif_capable(sdp
->host
, type
))
1981 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1984 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1985 " protection type %u. Disabling disk!\n",
1989 sd_printk(KERN_NOTICE
, sdkp
,
1990 "Enabling DIF Type %u protection\n", type
);
1993 sd_printk(KERN_NOTICE
, sdkp
,
1994 "Disabling DIF Type %u protection\n", type
);
1998 sdkp
->protection_type
= type
;
2003 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2004 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
2007 if (driver_byte(the_result
) & DRIVER_SENSE
)
2008 sd_print_sense_hdr(sdkp
, sshdr
);
2010 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
2013 * Set dirty bit for removable devices if not ready -
2014 * sometimes drives will not report this properly.
2016 if (sdp
->removable
&&
2017 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
2018 set_media_not_present(sdkp
);
2021 * We used to set media_present to 0 here to indicate no media
2022 * in the drive, but some drives fail read capacity even with
2023 * media present, so we can't do that.
2025 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
2029 #if RC16_LEN > SD_BUF_SIZE
2030 #error RC16_LEN must not be more than SD_BUF_SIZE
2033 #define READ_CAPACITY_RETRIES_ON_RESET 10
2035 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2036 unsigned char *buffer
)
2038 unsigned char cmd
[16];
2039 struct scsi_sense_hdr sshdr
;
2040 int sense_valid
= 0;
2042 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2043 unsigned int alignment
;
2044 unsigned long long lba
;
2045 unsigned sector_size
;
2047 if (sdp
->no_read_capacity_16
)
2052 cmd
[0] = SERVICE_ACTION_IN_16
;
2053 cmd
[1] = SAI_READ_CAPACITY_16
;
2055 memset(buffer
, 0, RC16_LEN
);
2057 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2058 buffer
, RC16_LEN
, &sshdr
,
2059 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2061 if (media_not_present(sdkp
, &sshdr
))
2065 sense_valid
= scsi_sense_valid(&sshdr
);
2067 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2068 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
2070 /* Invalid Command Operation Code or
2071 * Invalid Field in CDB, just retry
2072 * silently with RC10 */
2075 sshdr
.sense_key
== UNIT_ATTENTION
&&
2076 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2077 /* Device reset might occur several times,
2078 * give it one more chance */
2079 if (--reset_retries
> 0)
2084 } while (the_result
&& retries
);
2087 sd_print_result(sdkp
, "Read Capacity(16) failed", the_result
);
2088 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2092 sector_size
= get_unaligned_be32(&buffer
[8]);
2093 lba
= get_unaligned_be64(&buffer
[0]);
2095 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
2100 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
2101 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2102 "kernel compiled with support for large block "
2108 /* Logical blocks per physical block exponent */
2109 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2111 /* Lowest aligned logical block */
2112 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2113 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2114 if (alignment
&& sdkp
->first_scan
)
2115 sd_printk(KERN_NOTICE
, sdkp
,
2116 "physical block alignment offset: %u\n", alignment
);
2118 if (buffer
[14] & 0x80) { /* LBPME */
2121 if (buffer
[14] & 0x40) /* LBPRZ */
2124 sd_config_discard(sdkp
, SD_LBP_WS16
);
2127 sdkp
->capacity
= lba
+ 1;
2131 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2132 unsigned char *buffer
)
2134 unsigned char cmd
[16];
2135 struct scsi_sense_hdr sshdr
;
2136 int sense_valid
= 0;
2138 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2140 unsigned sector_size
;
2143 cmd
[0] = READ_CAPACITY
;
2144 memset(&cmd
[1], 0, 9);
2145 memset(buffer
, 0, 8);
2147 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2149 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2151 if (media_not_present(sdkp
, &sshdr
))
2155 sense_valid
= scsi_sense_valid(&sshdr
);
2157 sshdr
.sense_key
== UNIT_ATTENTION
&&
2158 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2159 /* Device reset might occur several times,
2160 * give it one more chance */
2161 if (--reset_retries
> 0)
2166 } while (the_result
&& retries
);
2169 sd_print_result(sdkp
, "Read Capacity(10) failed", the_result
);
2170 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2174 sector_size
= get_unaligned_be32(&buffer
[4]);
2175 lba
= get_unaligned_be32(&buffer
[0]);
2177 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2178 /* Some buggy (usb cardreader) devices return an lba of
2179 0xffffffff when the want to report a size of 0 (with
2180 which they really mean no media is present) */
2182 sdkp
->physical_block_size
= sector_size
;
2186 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2187 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2188 "kernel compiled with support for large block "
2194 sdkp
->capacity
= lba
+ 1;
2195 sdkp
->physical_block_size
= sector_size
;
2199 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2201 if (sdp
->host
->max_cmd_len
< 16)
2203 if (sdp
->try_rc_10_first
)
2205 if (sdp
->scsi_level
> SCSI_SPC_2
)
2207 if (scsi_device_protection(sdp
))
2213 * read disk capacity
2216 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2219 struct scsi_device
*sdp
= sdkp
->device
;
2220 sector_t old_capacity
= sdkp
->capacity
;
2222 if (sd_try_rc16_first(sdp
)) {
2223 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2224 if (sector_size
== -EOVERFLOW
)
2226 if (sector_size
== -ENODEV
)
2228 if (sector_size
< 0)
2229 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2230 if (sector_size
< 0)
2233 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2234 if (sector_size
== -EOVERFLOW
)
2236 if (sector_size
< 0)
2238 if ((sizeof(sdkp
->capacity
) > 4) &&
2239 (sdkp
->capacity
> 0xffffffffULL
)) {
2240 int old_sector_size
= sector_size
;
2241 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2242 "Trying to use READ CAPACITY(16).\n");
2243 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2244 if (sector_size
< 0) {
2245 sd_printk(KERN_NOTICE
, sdkp
,
2246 "Using 0xffffffff as device size\n");
2247 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2248 sector_size
= old_sector_size
;
2254 /* Some devices are known to return the total number of blocks,
2255 * not the highest block number. Some devices have versions
2256 * which do this and others which do not. Some devices we might
2257 * suspect of doing this but we don't know for certain.
2259 * If we know the reported capacity is wrong, decrement it. If
2260 * we can only guess, then assume the number of blocks is even
2261 * (usually true but not always) and err on the side of lowering
2264 if (sdp
->fix_capacity
||
2265 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2266 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2267 "from its reported value: %llu\n",
2268 (unsigned long long) sdkp
->capacity
);
2273 if (sector_size
== 0) {
2275 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2279 if (sector_size
!= 512 &&
2280 sector_size
!= 1024 &&
2281 sector_size
!= 2048 &&
2282 sector_size
!= 4096) {
2283 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2286 * The user might want to re-format the drive with
2287 * a supported sectorsize. Once this happens, it
2288 * would be relatively trivial to set the thing up.
2289 * For this reason, we leave the thing in the table.
2293 * set a bogus sector size so the normal read/write
2294 * logic in the block layer will eventually refuse any
2295 * request on this device without tripping over power
2296 * of two sector size assumptions
2300 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2303 char cap_str_2
[10], cap_str_10
[10];
2305 string_get_size(sdkp
->capacity
, sector_size
,
2306 STRING_UNITS_2
, cap_str_2
, sizeof(cap_str_2
));
2307 string_get_size(sdkp
->capacity
, sector_size
,
2308 STRING_UNITS_10
, cap_str_10
,
2309 sizeof(cap_str_10
));
2311 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2312 sd_printk(KERN_NOTICE
, sdkp
,
2313 "%llu %d-byte logical blocks: (%s/%s)\n",
2314 (unsigned long long)sdkp
->capacity
,
2315 sector_size
, cap_str_10
, cap_str_2
);
2317 if (sdkp
->physical_block_size
!= sector_size
)
2318 sd_printk(KERN_NOTICE
, sdkp
,
2319 "%u-byte physical blocks\n",
2320 sdkp
->physical_block_size
);
2324 if (sdkp
->capacity
> 0xffffffff) {
2325 sdp
->use_16_for_rw
= 1;
2326 sdkp
->max_xfer_blocks
= SD_MAX_XFER_BLOCKS
;
2328 sdkp
->max_xfer_blocks
= SD_DEF_XFER_BLOCKS
;
2330 /* Rescale capacity to 512-byte units */
2331 if (sector_size
== 4096)
2332 sdkp
->capacity
<<= 3;
2333 else if (sector_size
== 2048)
2334 sdkp
->capacity
<<= 2;
2335 else if (sector_size
== 1024)
2336 sdkp
->capacity
<<= 1;
2338 blk_queue_physical_block_size(sdp
->request_queue
,
2339 sdkp
->physical_block_size
);
2340 sdkp
->device
->sector_size
= sector_size
;
2343 /* called with buffer of length 512 */
2345 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2346 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2347 struct scsi_sense_hdr
*sshdr
)
2349 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2350 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2355 * read write protect setting, if possible - called only in sd_revalidate_disk()
2356 * called with buffer of length SD_BUF_SIZE
2359 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2362 struct scsi_device
*sdp
= sdkp
->device
;
2363 struct scsi_mode_data data
;
2364 int old_wp
= sdkp
->write_prot
;
2366 set_disk_ro(sdkp
->disk
, 0);
2367 if (sdp
->skip_ms_page_3f
) {
2368 sd_first_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2372 if (sdp
->use_192_bytes_for_3f
) {
2373 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2376 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2377 * We have to start carefully: some devices hang if we ask
2378 * for more than is available.
2380 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2383 * Second attempt: ask for page 0 When only page 0 is
2384 * implemented, a request for page 3F may return Sense Key
2385 * 5: Illegal Request, Sense Code 24: Invalid field in
2388 if (!scsi_status_is_good(res
))
2389 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2392 * Third attempt: ask 255 bytes, as we did earlier.
2394 if (!scsi_status_is_good(res
))
2395 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2399 if (!scsi_status_is_good(res
)) {
2400 sd_first_printk(KERN_WARNING
, sdkp
,
2401 "Test WP failed, assume Write Enabled\n");
2403 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2404 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2405 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2406 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2407 sdkp
->write_prot
? "on" : "off");
2408 sd_printk(KERN_DEBUG
, sdkp
,
2409 "Mode Sense: %02x %02x %02x %02x\n",
2410 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2416 * sd_read_cache_type - called only from sd_revalidate_disk()
2417 * called with buffer of length SD_BUF_SIZE
2420 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2423 struct scsi_device
*sdp
= sdkp
->device
;
2428 struct scsi_mode_data data
;
2429 struct scsi_sense_hdr sshdr
;
2430 int old_wce
= sdkp
->WCE
;
2431 int old_rcd
= sdkp
->RCD
;
2432 int old_dpofua
= sdkp
->DPOFUA
;
2435 if (sdkp
->cache_override
)
2439 if (sdp
->skip_ms_page_8
) {
2440 if (sdp
->type
== TYPE_RBC
)
2443 if (sdp
->skip_ms_page_3f
)
2446 if (sdp
->use_192_bytes_for_3f
)
2450 } else if (sdp
->type
== TYPE_RBC
) {
2458 /* cautiously ask */
2459 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2462 if (!scsi_status_is_good(res
))
2465 if (!data
.header_length
) {
2468 sd_first_printk(KERN_ERR
, sdkp
,
2469 "Missing header in MODE_SENSE response\n");
2472 /* that went OK, now ask for the proper length */
2476 * We're only interested in the first three bytes, actually.
2477 * But the data cache page is defined for the first 20.
2481 else if (len
> SD_BUF_SIZE
) {
2482 sd_first_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2483 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2486 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2490 if (len
> first_len
)
2491 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2494 if (scsi_status_is_good(res
)) {
2495 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2497 while (offset
< len
) {
2498 u8 page_code
= buffer
[offset
] & 0x3F;
2499 u8 spf
= buffer
[offset
] & 0x40;
2501 if (page_code
== 8 || page_code
== 6) {
2502 /* We're interested only in the first 3 bytes.
2504 if (len
- offset
<= 2) {
2505 sd_first_printk(KERN_ERR
, sdkp
,
2506 "Incomplete mode parameter "
2510 modepage
= page_code
;
2514 /* Go to the next page */
2515 if (spf
&& len
- offset
> 3)
2516 offset
+= 4 + (buffer
[offset
+2] << 8) +
2518 else if (!spf
&& len
- offset
> 1)
2519 offset
+= 2 + buffer
[offset
+1];
2521 sd_first_printk(KERN_ERR
, sdkp
,
2523 "parameter data\n");
2529 sd_first_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2533 if (modepage
== 8) {
2534 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2535 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2537 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2541 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2542 if (sdp
->broken_fua
) {
2543 sd_first_printk(KERN_NOTICE
, sdkp
, "Disabling FUA\n");
2545 } else if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2546 sd_first_printk(KERN_NOTICE
, sdkp
,
2547 "Uses READ/WRITE(6), disabling FUA\n");
2551 /* No cache flush allowed for write protected devices */
2552 if (sdkp
->WCE
&& sdkp
->write_prot
)
2555 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2556 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2557 sd_printk(KERN_NOTICE
, sdkp
,
2558 "Write cache: %s, read cache: %s, %s\n",
2559 sdkp
->WCE
? "enabled" : "disabled",
2560 sdkp
->RCD
? "disabled" : "enabled",
2561 sdkp
->DPOFUA
? "supports DPO and FUA"
2562 : "doesn't support DPO or FUA");
2568 if (scsi_sense_valid(&sshdr
) &&
2569 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2570 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2571 /* Invalid field in CDB */
2572 sd_first_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2574 sd_first_printk(KERN_ERR
, sdkp
,
2575 "Asking for cache data failed\n");
2578 if (sdp
->wce_default_on
) {
2579 sd_first_printk(KERN_NOTICE
, sdkp
,
2580 "Assuming drive cache: write back\n");
2583 sd_first_printk(KERN_ERR
, sdkp
,
2584 "Assuming drive cache: write through\n");
2592 * The ATO bit indicates whether the DIF application tag is available
2593 * for use by the operating system.
2595 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2598 struct scsi_device
*sdp
= sdkp
->device
;
2599 struct scsi_mode_data data
;
2600 struct scsi_sense_hdr sshdr
;
2602 if (sdp
->type
!= TYPE_DISK
)
2605 if (sdkp
->protection_type
== 0)
2608 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2609 SD_MAX_RETRIES
, &data
, &sshdr
);
2611 if (!scsi_status_is_good(res
) || !data
.header_length
||
2613 sd_first_printk(KERN_WARNING
, sdkp
,
2614 "getting Control mode page failed, assume no ATO\n");
2616 if (scsi_sense_valid(&sshdr
))
2617 sd_print_sense_hdr(sdkp
, &sshdr
);
2622 offset
= data
.header_length
+ data
.block_descriptor_length
;
2624 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2625 sd_first_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2629 if ((buffer
[offset
+ 5] & 0x80) == 0)
2638 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2639 * @disk: disk to query
2641 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2643 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2644 const int vpd_len
= 64;
2645 u32 max_xfer_length
;
2646 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2649 /* Block Limits VPD */
2650 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2653 max_xfer_length
= get_unaligned_be32(&buffer
[8]);
2654 if (max_xfer_length
)
2655 sdkp
->max_xfer_blocks
= max_xfer_length
;
2657 blk_queue_io_min(sdkp
->disk
->queue
,
2658 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2659 blk_queue_io_opt(sdkp
->disk
->queue
,
2660 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2662 if (buffer
[3] == 0x3c) {
2663 unsigned int lba_count
, desc_count
;
2665 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2670 lba_count
= get_unaligned_be32(&buffer
[20]);
2671 desc_count
= get_unaligned_be32(&buffer
[24]);
2673 if (lba_count
&& desc_count
)
2674 sdkp
->max_unmap_blocks
= lba_count
;
2676 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2678 if (buffer
[32] & 0x80)
2679 sdkp
->unmap_alignment
=
2680 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2682 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2684 if (sdkp
->max_unmap_blocks
)
2685 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2687 sd_config_discard(sdkp
, SD_LBP_WS16
);
2689 } else { /* LBP VPD page tells us what to use */
2690 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
&& !sdkp
->lbprz
)
2691 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2692 else if (sdkp
->lbpws
)
2693 sd_config_discard(sdkp
, SD_LBP_WS16
);
2694 else if (sdkp
->lbpws10
)
2695 sd_config_discard(sdkp
, SD_LBP_WS10
);
2696 else if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2697 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2699 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2708 * sd_read_block_characteristics - Query block dev. characteristics
2709 * @disk: disk to query
2711 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2713 unsigned char *buffer
;
2715 const int vpd_len
= 64;
2717 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2720 /* Block Device Characteristics VPD */
2721 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2724 rot
= get_unaligned_be16(&buffer
[4]);
2727 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2728 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM
, sdkp
->disk
->queue
);
2736 * sd_read_block_provisioning - Query provisioning VPD page
2737 * @disk: disk to query
2739 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2741 unsigned char *buffer
;
2742 const int vpd_len
= 8;
2744 if (sdkp
->lbpme
== 0)
2747 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2749 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2753 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2754 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2755 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2761 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2763 struct scsi_device
*sdev
= sdkp
->device
;
2765 if (sdev
->host
->no_write_same
) {
2766 sdev
->no_write_same
= 1;
2771 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2772 /* too large values might cause issues with arcmsr */
2773 int vpd_buf_len
= 64;
2775 sdev
->no_report_opcodes
= 1;
2777 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2778 * CODES is unsupported and the device has an ATA
2779 * Information VPD page (SAT).
2781 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2782 sdev
->no_write_same
= 1;
2785 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2788 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2792 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2794 /* Attempt VPD inquiry if the device blacklist explicitly calls
2797 if (sdp
->try_vpd_pages
)
2800 * Although VPD inquiries can go to SCSI-2 type devices,
2801 * some USB ones crash on receiving them, and the pages
2802 * we currently ask for are for SPC-3 and beyond
2804 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2810 * sd_revalidate_disk - called the first time a new disk is seen,
2811 * performs disk spin up, read_capacity, etc.
2812 * @disk: struct gendisk we care about
2814 static int sd_revalidate_disk(struct gendisk
*disk
)
2816 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2817 struct scsi_device
*sdp
= sdkp
->device
;
2818 unsigned char *buffer
;
2819 unsigned int max_xfer
;
2821 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2822 "sd_revalidate_disk\n"));
2825 * If the device is offline, don't try and read capacity or any
2826 * of the other niceties.
2828 if (!scsi_device_online(sdp
))
2831 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2833 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2834 "allocation failure.\n");
2838 sd_spinup_disk(sdkp
);
2841 * Without media there is no reason to ask; moreover, some devices
2842 * react badly if we do.
2844 if (sdkp
->media_present
) {
2845 sd_read_capacity(sdkp
, buffer
);
2847 if (sd_try_extended_inquiry(sdp
)) {
2848 sd_read_block_provisioning(sdkp
);
2849 sd_read_block_limits(sdkp
);
2850 sd_read_block_characteristics(sdkp
);
2853 sd_read_write_protect_flag(sdkp
, buffer
);
2854 sd_read_cache_type(sdkp
, buffer
);
2855 sd_read_app_tag_own(sdkp
, buffer
);
2856 sd_read_write_same(sdkp
, buffer
);
2859 sdkp
->first_scan
= 0;
2862 * We now have all cache related info, determine how we deal
2863 * with flush requests.
2865 sd_set_flush_flag(sdkp
);
2867 max_xfer
= sdkp
->max_xfer_blocks
;
2868 max_xfer
<<= ilog2(sdp
->sector_size
) - 9;
2870 sdkp
->disk
->queue
->limits
.max_sectors
=
2871 min_not_zero(queue_max_hw_sectors(sdkp
->disk
->queue
), max_xfer
);
2873 set_capacity(disk
, sdkp
->capacity
);
2874 sd_config_write_same(sdkp
);
2882 * sd_unlock_native_capacity - unlock native capacity
2883 * @disk: struct gendisk to set capacity for
2885 * Block layer calls this function if it detects that partitions
2886 * on @disk reach beyond the end of the device. If the SCSI host
2887 * implements ->unlock_native_capacity() method, it's invoked to
2888 * give it a chance to adjust the device capacity.
2891 * Defined by block layer. Might sleep.
2893 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2895 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2897 if (sdev
->host
->hostt
->unlock_native_capacity
)
2898 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2902 * sd_format_disk_name - format disk name
2903 * @prefix: name prefix - ie. "sd" for SCSI disks
2904 * @index: index of the disk to format name for
2905 * @buf: output buffer
2906 * @buflen: length of the output buffer
2908 * SCSI disk names starts at sda. The 26th device is sdz and the
2909 * 27th is sdaa. The last one for two lettered suffix is sdzz
2910 * which is followed by sdaaa.
2912 * This is basically 26 base counting with one extra 'nil' entry
2913 * at the beginning from the second digit on and can be
2914 * determined using similar method as 26 base conversion with the
2915 * index shifted -1 after each digit is computed.
2921 * 0 on success, -errno on failure.
2923 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2925 const int base
= 'z' - 'a' + 1;
2926 char *begin
= buf
+ strlen(prefix
);
2927 char *end
= buf
+ buflen
;
2937 *--p
= 'a' + (index
% unit
);
2938 index
= (index
/ unit
) - 1;
2939 } while (index
>= 0);
2941 memmove(begin
, p
, end
- p
);
2942 memcpy(buf
, prefix
, strlen(prefix
));
2948 * The asynchronous part of sd_probe
2950 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2952 struct scsi_disk
*sdkp
= data
;
2953 struct scsi_device
*sdp
;
2960 index
= sdkp
->index
;
2961 dev
= &sdp
->sdev_gendev
;
2963 gd
->major
= sd_major((index
& 0xf0) >> 4);
2964 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2965 gd
->minors
= SD_MINORS
;
2967 gd
->fops
= &sd_fops
;
2968 gd
->private_data
= &sdkp
->driver
;
2969 gd
->queue
= sdkp
->device
->request_queue
;
2971 /* defaults, until the device tells us otherwise */
2972 sdp
->sector_size
= 512;
2974 sdkp
->media_present
= 1;
2975 sdkp
->write_prot
= 0;
2976 sdkp
->cache_override
= 0;
2980 sdkp
->first_scan
= 1;
2981 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2983 sd_revalidate_disk(gd
);
2985 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2986 gd
->flags
= GENHD_FL_EXT_DEVT
;
2987 if (sdp
->removable
) {
2988 gd
->flags
|= GENHD_FL_REMOVABLE
;
2989 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2992 blk_pm_runtime_init(sdp
->request_queue
, dev
);
2995 sd_dif_config_host(sdkp
);
2997 sd_revalidate_disk(gd
);
2999 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
3000 sdp
->removable
? "removable " : "");
3001 scsi_autopm_put_device(sdp
);
3002 put_device(&sdkp
->dev
);
3006 * sd_probe - called during driver initialization and whenever a
3007 * new scsi device is attached to the system. It is called once
3008 * for each scsi device (not just disks) present.
3009 * @dev: pointer to device object
3011 * Returns 0 if successful (or not interested in this scsi device
3012 * (e.g. scanner)); 1 when there is an error.
3014 * Note: this function is invoked from the scsi mid-level.
3015 * This function sets up the mapping between a given
3016 * <host,channel,id,lun> (found in sdp) and new device name
3017 * (e.g. /dev/sda). More precisely it is the block device major
3018 * and minor number that is chosen here.
3020 * Assume sd_probe is not re-entrant (for time being)
3021 * Also think about sd_probe() and sd_remove() running coincidentally.
3023 static int sd_probe(struct device
*dev
)
3025 struct scsi_device
*sdp
= to_scsi_device(dev
);
3026 struct scsi_disk
*sdkp
;
3031 scsi_autopm_get_device(sdp
);
3033 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
3036 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
3040 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
3044 gd
= alloc_disk(SD_MINORS
);
3049 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
3052 spin_lock(&sd_index_lock
);
3053 error
= ida_get_new(&sd_index_ida
, &index
);
3054 spin_unlock(&sd_index_lock
);
3055 } while (error
== -EAGAIN
);
3058 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
3062 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
3064 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
3065 goto out_free_index
;
3069 sdkp
->driver
= &sd_template
;
3071 sdkp
->index
= index
;
3072 atomic_set(&sdkp
->openers
, 0);
3073 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
3075 if (!sdp
->request_queue
->rq_timeout
) {
3076 if (sdp
->type
!= TYPE_MOD
)
3077 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
3079 blk_queue_rq_timeout(sdp
->request_queue
,
3083 device_initialize(&sdkp
->dev
);
3084 sdkp
->dev
.parent
= dev
;
3085 sdkp
->dev
.class = &sd_disk_class
;
3086 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
3088 error
= device_add(&sdkp
->dev
);
3090 goto out_free_index
;
3093 dev_set_drvdata(dev
, sdkp
);
3095 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
3096 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
3101 spin_lock(&sd_index_lock
);
3102 ida_remove(&sd_index_ida
, index
);
3103 spin_unlock(&sd_index_lock
);
3109 scsi_autopm_put_device(sdp
);
3114 * sd_remove - called whenever a scsi disk (previously recognized by
3115 * sd_probe) is detached from the system. It is called (potentially
3116 * multiple times) during sd module unload.
3117 * @sdp: pointer to mid level scsi device object
3119 * Note: this function is invoked from the scsi mid-level.
3120 * This function potentially frees up a device name (e.g. /dev/sdc)
3121 * that could be re-used by a subsequent sd_probe().
3122 * This function is not called when the built-in sd driver is "exit-ed".
3124 static int sd_remove(struct device
*dev
)
3126 struct scsi_disk
*sdkp
;
3129 sdkp
= dev_get_drvdata(dev
);
3130 devt
= disk_devt(sdkp
->disk
);
3131 scsi_autopm_get_device(sdkp
->device
);
3133 async_synchronize_full_domain(&scsi_sd_pm_domain
);
3134 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3135 device_del(&sdkp
->dev
);
3136 del_gendisk(sdkp
->disk
);
3139 blk_register_region(devt
, SD_MINORS
, NULL
,
3140 sd_default_probe
, NULL
, NULL
);
3142 mutex_lock(&sd_ref_mutex
);
3143 dev_set_drvdata(dev
, NULL
);
3144 put_device(&sdkp
->dev
);
3145 mutex_unlock(&sd_ref_mutex
);
3151 * scsi_disk_release - Called to free the scsi_disk structure
3152 * @dev: pointer to embedded class device
3154 * sd_ref_mutex must be held entering this routine. Because it is
3155 * called on last put, you should always use the scsi_disk_get()
3156 * scsi_disk_put() helpers which manipulate the semaphore directly
3157 * and never do a direct put_device.
3159 static void scsi_disk_release(struct device
*dev
)
3161 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3162 struct gendisk
*disk
= sdkp
->disk
;
3164 spin_lock(&sd_index_lock
);
3165 ida_remove(&sd_index_ida
, sdkp
->index
);
3166 spin_unlock(&sd_index_lock
);
3168 disk
->private_data
= NULL
;
3170 put_device(&sdkp
->device
->sdev_gendev
);
3175 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3177 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3178 struct scsi_sense_hdr sshdr
;
3179 struct scsi_device
*sdp
= sdkp
->device
;
3183 cmd
[4] |= 1; /* START */
3185 if (sdp
->start_stop_pwr_cond
)
3186 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3188 if (!scsi_device_online(sdp
))
3191 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3192 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, REQ_PM
);
3194 sd_print_result(sdkp
, "Start/Stop Unit failed", res
);
3195 if (driver_byte(res
) & DRIVER_SENSE
)
3196 sd_print_sense_hdr(sdkp
, &sshdr
);
3197 if (scsi_sense_valid(&sshdr
) &&
3198 /* 0x3a is medium not present */
3203 /* SCSI error codes must not go to the generic layer */
3211 * Send a SYNCHRONIZE CACHE instruction down to the device through
3212 * the normal SCSI command structure. Wait for the command to
3215 static void sd_shutdown(struct device
*dev
)
3217 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3220 return; /* this can happen */
3222 if (pm_runtime_suspended(dev
))
3225 if (sdkp
->WCE
&& sdkp
->media_present
) {
3226 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3227 sd_sync_cache(sdkp
);
3230 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3231 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3232 sd_start_stop_device(sdkp
, 0);
3236 static int sd_suspend_common(struct device
*dev
, bool ignore_stop_errors
)
3238 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3242 return 0; /* this can happen */
3244 if (sdkp
->WCE
&& sdkp
->media_present
) {
3245 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3246 ret
= sd_sync_cache(sdkp
);
3248 /* ignore OFFLINE device */
3255 if (sdkp
->device
->manage_start_stop
) {
3256 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3257 /* an error is not worth aborting a system sleep */
3258 ret
= sd_start_stop_device(sdkp
, 0);
3259 if (ignore_stop_errors
)
3267 static int sd_suspend_system(struct device
*dev
)
3269 return sd_suspend_common(dev
, true);
3272 static int sd_suspend_runtime(struct device
*dev
)
3274 return sd_suspend_common(dev
, false);
3277 static int sd_resume(struct device
*dev
)
3279 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
3281 if (!sdkp
->device
->manage_start_stop
)
3284 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3285 return sd_start_stop_device(sdkp
, 1);
3289 * init_sd - entry point for this driver (both when built in or when
3292 * Note: this function registers this driver with the scsi mid-level.
3294 static int __init
init_sd(void)
3296 int majors
= 0, i
, err
;
3298 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3300 for (i
= 0; i
< SD_MAJORS
; i
++) {
3301 if (register_blkdev(sd_major(i
), "sd") != 0)
3304 blk_register_region(sd_major(i
), SD_MINORS
, NULL
,
3305 sd_default_probe
, NULL
, NULL
);
3311 err
= class_register(&sd_disk_class
);
3315 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3317 if (!sd_cdb_cache
) {
3318 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3323 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3325 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3330 err
= scsi_register_driver(&sd_template
.gendrv
);
3332 goto err_out_driver
;
3337 mempool_destroy(sd_cdb_pool
);
3340 kmem_cache_destroy(sd_cdb_cache
);
3343 class_unregister(&sd_disk_class
);
3345 for (i
= 0; i
< SD_MAJORS
; i
++)
3346 unregister_blkdev(sd_major(i
), "sd");
3351 * exit_sd - exit point for this driver (when it is a module).
3353 * Note: this function unregisters this driver from the scsi mid-level.
3355 static void __exit
exit_sd(void)
3359 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3361 scsi_unregister_driver(&sd_template
.gendrv
);
3362 mempool_destroy(sd_cdb_pool
);
3363 kmem_cache_destroy(sd_cdb_cache
);
3365 class_unregister(&sd_disk_class
);
3367 for (i
= 0; i
< SD_MAJORS
; i
++) {
3368 blk_unregister_region(sd_major(i
), SD_MINORS
);
3369 unregister_blkdev(sd_major(i
), "sd");
3373 module_init(init_sd
);
3374 module_exit(exit_sd
);
3376 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3377 struct scsi_sense_hdr
*sshdr
)
3379 scsi_print_sense_hdr(sdkp
->device
,
3380 sdkp
->disk
? sdkp
->disk
->disk_name
: NULL
, sshdr
);
3383 static void sd_print_result(const struct scsi_disk
*sdkp
, const char *msg
,
3386 const char *hb_string
= scsi_hostbyte_string(result
);
3387 const char *db_string
= scsi_driverbyte_string(result
);
3389 if (hb_string
|| db_string
)
3390 sd_printk(KERN_INFO
, sdkp
,
3391 "%s: Result: hostbyte=%s driverbyte=%s\n", msg
,
3392 hb_string
? hb_string
: "invalid",
3393 db_string
? db_string
: "invalid");
3395 sd_printk(KERN_INFO
, sdkp
,
3396 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3397 msg
, host_byte(result
), driver_byte(result
));