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>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
101 static void sd_config_discard(struct scsi_disk
*, unsigned int);
102 static int sd_revalidate_disk(struct gendisk
*);
103 static void sd_unlock_native_capacity(struct gendisk
*disk
);
104 static int sd_probe(struct device
*);
105 static int sd_remove(struct device
*);
106 static void sd_shutdown(struct device
*);
107 static int sd_suspend(struct device
*, pm_message_t state
);
108 static int sd_resume(struct device
*);
109 static void sd_rescan(struct device
*);
110 static int sd_done(struct scsi_cmnd
*);
111 static int sd_eh_action(struct scsi_cmnd
*, unsigned char *, int, int);
112 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
113 static void scsi_disk_release(struct device
*cdev
);
114 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
115 static void sd_print_result(struct scsi_disk
*, int);
117 static DEFINE_SPINLOCK(sd_index_lock
);
118 static DEFINE_IDA(sd_index_ida
);
120 /* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
123 static DEFINE_MUTEX(sd_ref_mutex
);
125 static struct kmem_cache
*sd_cdb_cache
;
126 static mempool_t
*sd_cdb_pool
;
128 static const char *sd_cache_types
[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
134 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
135 const char *buf
, size_t count
)
137 int i
, ct
= -1, rcd
, wce
, sp
;
138 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
139 struct scsi_device
*sdp
= sdkp
->device
;
142 struct scsi_mode_data data
;
143 struct scsi_sense_hdr sshdr
;
146 if (sdp
->type
!= TYPE_DISK
)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
152 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
153 len
= strlen(sd_cache_types
[i
]);
154 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
162 rcd
= ct
& 0x01 ? 1 : 0;
163 wce
= ct
& 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
165 SD_MAX_RETRIES
, &data
, NULL
))
167 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
168 data
.block_descriptor_length
);
169 buffer_data
= buffer
+ data
.header_length
+
170 data
.block_descriptor_length
;
171 buffer_data
[2] &= ~0x05;
172 buffer_data
[2] |= wce
<< 2 | rcd
;
173 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
175 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
176 SD_MAX_RETRIES
, &data
, &sshdr
)) {
177 if (scsi_sense_valid(&sshdr
))
178 sd_print_sense_hdr(sdkp
, &sshdr
);
181 revalidate_disk(sdkp
->disk
);
186 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
187 const char *buf
, size_t count
)
189 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
190 struct scsi_device
*sdp
= sdkp
->device
;
192 if (!capable(CAP_SYS_ADMIN
))
195 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
201 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
202 const char *buf
, size_t count
)
204 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
205 struct scsi_device
*sdp
= sdkp
->device
;
207 if (!capable(CAP_SYS_ADMIN
))
210 if (sdp
->type
!= TYPE_DISK
)
213 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
219 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
222 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
223 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
225 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
229 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
231 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
233 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
237 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
240 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
241 struct scsi_device
*sdp
= sdkp
->device
;
243 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
247 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
250 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
252 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
256 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
259 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
261 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
265 sd_store_protection_type(struct device
*dev
, struct device_attribute
*attr
,
266 const char *buf
, size_t count
)
268 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
272 if (!capable(CAP_SYS_ADMIN
))
275 err
= kstrtouint(buf
, 10, &val
);
280 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
281 sdkp
->protection_type
= val
;
287 sd_show_protection_mode(struct device
*dev
, struct device_attribute
*attr
,
290 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
291 struct scsi_device
*sdp
= sdkp
->device
;
292 unsigned int dif
, dix
;
294 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
295 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
297 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
303 return snprintf(buf
, 20, "none\n");
305 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
309 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
312 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
314 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
318 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
321 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
323 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
326 static const char *lbp_mode
[] = {
327 [SD_LBP_FULL
] = "full",
328 [SD_LBP_UNMAP
] = "unmap",
329 [SD_LBP_WS16
] = "writesame_16",
330 [SD_LBP_WS10
] = "writesame_10",
331 [SD_LBP_ZERO
] = "writesame_zero",
332 [SD_LBP_DISABLE
] = "disabled",
336 sd_show_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
339 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
341 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
345 sd_store_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
346 const char *buf
, size_t count
)
348 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
349 struct scsi_device
*sdp
= sdkp
->device
;
351 if (!capable(CAP_SYS_ADMIN
))
354 if (sdp
->type
!= TYPE_DISK
)
357 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
358 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
359 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
360 sd_config_discard(sdkp
, SD_LBP_WS16
);
361 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
362 sd_config_discard(sdkp
, SD_LBP_WS10
);
363 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
364 sd_config_discard(sdkp
, SD_LBP_ZERO
);
365 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
366 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
374 sd_show_max_medium_access_timeouts(struct device
*dev
,
375 struct device_attribute
*attr
, char *buf
)
377 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
379 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
383 sd_store_max_medium_access_timeouts(struct device
*dev
,
384 struct device_attribute
*attr
,
385 const char *buf
, size_t count
)
387 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
390 if (!capable(CAP_SYS_ADMIN
))
393 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
395 return err
? err
: count
;
398 static struct device_attribute sd_disk_attrs
[] = {
399 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
400 sd_store_cache_type
),
401 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
402 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
403 sd_store_allow_restart
),
404 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
405 sd_store_manage_start_stop
),
406 __ATTR(protection_type
, S_IRUGO
|S_IWUSR
, sd_show_protection_type
,
407 sd_store_protection_type
),
408 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
409 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
410 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
411 __ATTR(provisioning_mode
, S_IRUGO
|S_IWUSR
, sd_show_provisioning_mode
,
412 sd_store_provisioning_mode
),
413 __ATTR(max_medium_access_timeouts
, S_IRUGO
|S_IWUSR
,
414 sd_show_max_medium_access_timeouts
,
415 sd_store_max_medium_access_timeouts
),
419 static struct class sd_disk_class
= {
421 .owner
= THIS_MODULE
,
422 .dev_release
= scsi_disk_release
,
423 .dev_attrs
= sd_disk_attrs
,
426 static struct scsi_driver sd_template
= {
427 .owner
= THIS_MODULE
,
432 .suspend
= sd_suspend
,
434 .shutdown
= sd_shutdown
,
438 .eh_action
= sd_eh_action
,
442 * Device no to disk mapping:
444 * major disc2 disc p1
445 * |............|.............|....|....| <- dev_t
448 * Inside a major, we have 16k disks, however mapped non-
449 * contiguously. The first 16 disks are for major0, the next
450 * ones with major1, ... Disk 256 is for major0 again, disk 272
452 * As we stay compatible with our numbering scheme, we can reuse
453 * the well-know SCSI majors 8, 65--71, 136--143.
455 static int sd_major(int major_idx
)
459 return SCSI_DISK0_MAJOR
;
461 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
463 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
466 return 0; /* shut up gcc */
470 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
472 struct scsi_disk
*sdkp
= NULL
;
474 if (disk
->private_data
) {
475 sdkp
= scsi_disk(disk
);
476 if (scsi_device_get(sdkp
->device
) == 0)
477 get_device(&sdkp
->dev
);
484 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
486 struct scsi_disk
*sdkp
;
488 mutex_lock(&sd_ref_mutex
);
489 sdkp
= __scsi_disk_get(disk
);
490 mutex_unlock(&sd_ref_mutex
);
494 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
496 struct scsi_disk
*sdkp
;
498 mutex_lock(&sd_ref_mutex
);
499 sdkp
= dev_get_drvdata(dev
);
501 sdkp
= __scsi_disk_get(sdkp
->disk
);
502 mutex_unlock(&sd_ref_mutex
);
506 static void scsi_disk_put(struct scsi_disk
*sdkp
)
508 struct scsi_device
*sdev
= sdkp
->device
;
510 mutex_lock(&sd_ref_mutex
);
511 put_device(&sdkp
->dev
);
512 scsi_device_put(sdev
);
513 mutex_unlock(&sd_ref_mutex
);
516 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
518 unsigned int prot_op
= SCSI_PROT_NORMAL
;
519 unsigned int dix
= scsi_prot_sg_count(scmd
);
521 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
523 prot_op
= SCSI_PROT_READ_PASS
;
524 else if (dif
&& !dix
)
525 prot_op
= SCSI_PROT_READ_STRIP
;
526 else if (!dif
&& dix
)
527 prot_op
= SCSI_PROT_READ_INSERT
;
530 prot_op
= SCSI_PROT_WRITE_PASS
;
531 else if (dif
&& !dix
)
532 prot_op
= SCSI_PROT_WRITE_INSERT
;
533 else if (!dif
&& dix
)
534 prot_op
= SCSI_PROT_WRITE_STRIP
;
537 scsi_set_prot_op(scmd
, prot_op
);
538 scsi_set_prot_type(scmd
, dif
);
541 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
543 struct request_queue
*q
= sdkp
->disk
->queue
;
544 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
545 unsigned int max_blocks
= 0;
547 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
548 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
550 q
->limits
.discard_granularity
=
551 max(sdkp
->physical_block_size
,
552 sdkp
->unmap_granularity
* logical_block_size
);
554 sdkp
->provisioning_mode
= mode
;
559 q
->limits
.max_discard_sectors
= 0;
560 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
564 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
, 0xffffffff);
568 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
, 0xffffffff);
572 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
, (u32
)0xffff);
576 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
, (u32
)0xffff);
577 q
->limits
.discard_zeroes_data
= 1;
581 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
582 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
586 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
587 * @sdp: scsi device to operate one
588 * @rq: Request to prepare
590 * Will issue either UNMAP or WRITE SAME(16) depending on preference
591 * indicated by target device.
593 static int scsi_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
595 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
596 struct bio
*bio
= rq
->bio
;
597 sector_t sector
= bio
->bi_sector
;
598 unsigned int nr_sectors
= bio_sectors(bio
);
604 if (sdkp
->device
->sector_size
== 4096) {
609 rq
->timeout
= SD_TIMEOUT
;
611 memset(rq
->cmd
, 0, rq
->cmd_len
);
613 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
615 return BLKPREP_DEFER
;
617 switch (sdkp
->provisioning_mode
) {
619 buf
= page_address(page
);
625 put_unaligned_be16(6 + 16, &buf
[0]);
626 put_unaligned_be16(16, &buf
[2]);
627 put_unaligned_be64(sector
, &buf
[8]);
628 put_unaligned_be32(nr_sectors
, &buf
[16]);
635 rq
->cmd
[0] = WRITE_SAME_16
;
636 rq
->cmd
[1] = 0x8; /* UNMAP */
637 put_unaligned_be64(sector
, &rq
->cmd
[2]);
638 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
640 len
= sdkp
->device
->sector_size
;
646 rq
->cmd
[0] = WRITE_SAME
;
647 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
648 rq
->cmd
[1] = 0x8; /* UNMAP */
649 put_unaligned_be32(sector
, &rq
->cmd
[2]);
650 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
652 len
= sdkp
->device
->sector_size
;
660 blk_add_request_payload(rq
, page
, len
);
661 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
662 rq
->buffer
= page_address(page
);
665 if (ret
!= BLKPREP_OK
) {
672 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
674 rq
->timeout
= SD_FLUSH_TIMEOUT
;
675 rq
->retries
= SD_MAX_RETRIES
;
676 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
679 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
682 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
684 if (rq
->cmd_flags
& REQ_DISCARD
) {
685 free_page((unsigned long)rq
->buffer
);
691 * sd_prep_fn - build a scsi (read or write) command from
692 * information in the request structure.
693 * @SCpnt: pointer to mid-level's per scsi command structure that
694 * contains request and into which the scsi command is written
696 * Returns 1 if successful and 0 if error (or cannot be done now).
698 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
700 struct scsi_cmnd
*SCpnt
;
701 struct scsi_device
*sdp
= q
->queuedata
;
702 struct gendisk
*disk
= rq
->rq_disk
;
703 struct scsi_disk
*sdkp
;
704 sector_t block
= blk_rq_pos(rq
);
706 unsigned int this_count
= blk_rq_sectors(rq
);
708 unsigned char protect
;
711 * Discard request come in as REQ_TYPE_FS but we turn them into
712 * block PC requests to make life easier.
714 if (rq
->cmd_flags
& REQ_DISCARD
) {
715 ret
= scsi_setup_discard_cmnd(sdp
, rq
);
717 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
718 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
720 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
721 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
723 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
727 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
728 if (ret
!= BLKPREP_OK
)
731 sdkp
= scsi_disk(disk
);
733 /* from here on until we're complete, any goto out
734 * is used for a killable error condition */
737 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
738 "sd_prep_fn: block=%llu, "
740 (unsigned long long)block
,
743 if (!sdp
|| !scsi_device_online(sdp
) ||
744 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
745 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
746 "Finishing %u sectors\n",
747 blk_rq_sectors(rq
)));
748 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
749 "Retry with 0x%p\n", SCpnt
));
755 * quietly refuse to do anything to a changed disc until
756 * the changed bit has been reset
758 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
763 * Some SD card readers can't handle multi-sector accesses which touch
764 * the last one or two hardware sectors. Split accesses as needed.
766 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
767 (sdp
->sector_size
/ 512);
769 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
770 if (block
< threshold
) {
771 /* Access up to the threshold but not beyond */
772 this_count
= threshold
- block
;
774 /* Access only a single hardware sector */
775 this_count
= sdp
->sector_size
/ 512;
779 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
780 (unsigned long long)block
));
783 * If we have a 1K hardware sectorsize, prevent access to single
784 * 512 byte sectors. In theory we could handle this - in fact
785 * the scsi cdrom driver must be able to handle this because
786 * we typically use 1K blocksizes, and cdroms typically have
787 * 2K hardware sectorsizes. Of course, things are simpler
788 * with the cdrom, since it is read-only. For performance
789 * reasons, the filesystems should be able to handle this
790 * and not force the scsi disk driver to use bounce buffers
793 if (sdp
->sector_size
== 1024) {
794 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
795 scmd_printk(KERN_ERR
, SCpnt
,
796 "Bad block number requested\n");
800 this_count
= this_count
>> 1;
803 if (sdp
->sector_size
== 2048) {
804 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
805 scmd_printk(KERN_ERR
, SCpnt
,
806 "Bad block number requested\n");
810 this_count
= this_count
>> 2;
813 if (sdp
->sector_size
== 4096) {
814 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
815 scmd_printk(KERN_ERR
, SCpnt
,
816 "Bad block number requested\n");
820 this_count
= this_count
>> 3;
823 if (rq_data_dir(rq
) == WRITE
) {
824 if (!sdp
->writeable
) {
827 SCpnt
->cmnd
[0] = WRITE_6
;
828 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
830 if (blk_integrity_rq(rq
))
831 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
833 } else if (rq_data_dir(rq
) == READ
) {
834 SCpnt
->cmnd
[0] = READ_6
;
835 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
837 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
841 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
842 "%s %d/%u 512 byte blocks.\n",
843 (rq_data_dir(rq
) == WRITE
) ?
844 "writing" : "reading", this_count
,
845 blk_rq_sectors(rq
)));
847 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
848 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
854 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
855 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
857 if (unlikely(SCpnt
->cmnd
== NULL
)) {
862 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
863 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
864 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
865 SCpnt
->cmnd
[7] = 0x18;
866 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
867 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
870 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
871 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
872 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
873 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
874 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
875 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
876 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
877 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
879 /* Expected Indirect LBA */
880 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
881 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
882 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
883 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
885 /* Transfer length */
886 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
887 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
888 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
889 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
890 } else if (block
> 0xffffffff) {
891 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
892 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
893 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
894 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
895 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
896 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
897 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
898 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
899 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
900 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
901 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
902 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
903 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
904 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
905 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
906 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
907 scsi_device_protection(SCpnt
->device
) ||
908 SCpnt
->device
->use_10_for_rw
) {
909 if (this_count
> 0xffff)
912 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
913 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
914 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
915 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
916 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
917 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
918 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
919 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
920 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
922 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
924 * This happens only if this drive failed
925 * 10byte rw command with ILLEGAL_REQUEST
926 * during operation and thus turned off
929 scmd_printk(KERN_ERR
, SCpnt
,
930 "FUA write on READ/WRITE(6) drive\n");
934 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
935 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
936 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
937 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
940 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
942 /* If DIF or DIX is enabled, tell HBA how to handle request */
943 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
944 sd_prot_op(SCpnt
, host_dif
);
947 * We shouldn't disconnect in the middle of a sector, so with a dumb
948 * host adapter, it's safe to assume that we can at least transfer
949 * this many bytes between each connect / disconnect.
951 SCpnt
->transfersize
= sdp
->sector_size
;
952 SCpnt
->underflow
= this_count
<< 9;
953 SCpnt
->allowed
= SD_MAX_RETRIES
;
956 * This indicates that the command is ready from our end to be
961 return scsi_prep_return(q
, rq
, ret
);
965 * sd_open - open a scsi disk device
966 * @inode: only i_rdev member may be used
967 * @filp: only f_mode and f_flags may be used
969 * Returns 0 if successful. Returns a negated errno value in case
972 * Note: This can be called from a user context (e.g. fsck(1) )
973 * or from within the kernel (e.g. as a result of a mount(1) ).
974 * In the latter case @inode and @filp carry an abridged amount
975 * of information as noted above.
977 * Locking: called with bdev->bd_mutex held.
979 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
981 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
982 struct scsi_device
*sdev
;
988 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
992 retval
= scsi_autopm_get_device(sdev
);
997 * If the device is in error recovery, wait until it is done.
998 * If the device is offline, then disallow any access to it.
1001 if (!scsi_block_when_processing_errors(sdev
))
1004 if (sdev
->removable
|| sdkp
->write_prot
)
1005 check_disk_change(bdev
);
1008 * If the drive is empty, just let the open fail.
1010 retval
= -ENOMEDIUM
;
1011 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1015 * If the device has the write protect tab set, have the open fail
1016 * if the user expects to be able to write to the thing.
1019 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1023 * It is possible that the disk changing stuff resulted in
1024 * the device being taken offline. If this is the case,
1025 * report this to the user, and don't pretend that the
1026 * open actually succeeded.
1029 if (!scsi_device_online(sdev
))
1032 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1033 if (scsi_block_when_processing_errors(sdev
))
1034 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1040 scsi_autopm_put_device(sdev
);
1042 scsi_disk_put(sdkp
);
1047 * sd_release - invoked when the (last) close(2) is called on this
1049 * @inode: only i_rdev member may be used
1050 * @filp: only f_mode and f_flags may be used
1054 * Note: may block (uninterruptible) if error recovery is underway
1057 * Locking: called with bdev->bd_mutex held.
1059 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
1061 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1062 struct scsi_device
*sdev
= sdkp
->device
;
1064 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1066 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1067 if (scsi_block_when_processing_errors(sdev
))
1068 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1072 * XXX and what if there are packets in flight and this close()
1073 * XXX is followed by a "rmmod sd_mod"?
1076 scsi_autopm_put_device(sdev
);
1077 scsi_disk_put(sdkp
);
1081 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1083 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1084 struct scsi_device
*sdp
= sdkp
->device
;
1085 struct Scsi_Host
*host
= sdp
->host
;
1088 /* default to most commonly used values */
1089 diskinfo
[0] = 0x40; /* 1 << 6 */
1090 diskinfo
[1] = 0x20; /* 1 << 5 */
1091 diskinfo
[2] = sdkp
->capacity
>> 11;
1093 /* override with calculated, extended default, or driver values */
1094 if (host
->hostt
->bios_param
)
1095 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1097 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1099 geo
->heads
= diskinfo
[0];
1100 geo
->sectors
= diskinfo
[1];
1101 geo
->cylinders
= diskinfo
[2];
1106 * sd_ioctl - process an ioctl
1107 * @inode: only i_rdev/i_bdev members may be used
1108 * @filp: only f_mode and f_flags may be used
1109 * @cmd: ioctl command number
1110 * @arg: this is third argument given to ioctl(2) system call.
1111 * Often contains a pointer.
1113 * Returns 0 if successful (some ioctls return positive numbers on
1114 * success as well). Returns a negated errno value in case of error.
1116 * Note: most ioctls are forward onto the block subsystem or further
1117 * down in the scsi subsystem.
1119 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1120 unsigned int cmd
, unsigned long arg
)
1122 struct gendisk
*disk
= bdev
->bd_disk
;
1123 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1124 struct scsi_device
*sdp
= sdkp
->device
;
1125 void __user
*p
= (void __user
*)arg
;
1128 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1129 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1131 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1136 * If we are in the middle of error recovery, don't let anyone
1137 * else try and use this device. Also, if error recovery fails, it
1138 * may try and take the device offline, in which case all further
1139 * access to the device is prohibited.
1141 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1142 (mode
& FMODE_NDELAY
) != 0);
1143 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1147 * Send SCSI addressing ioctls directly to mid level, send other
1148 * ioctls to block level and then onto mid level if they can't be
1152 case SCSI_IOCTL_GET_IDLUN
:
1153 case SCSI_IOCTL_GET_BUS_NUMBER
:
1154 error
= scsi_ioctl(sdp
, cmd
, p
);
1157 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1158 if (error
!= -ENOTTY
)
1160 error
= scsi_ioctl(sdp
, cmd
, p
);
1167 static void set_media_not_present(struct scsi_disk
*sdkp
)
1169 if (sdkp
->media_present
)
1170 sdkp
->device
->changed
= 1;
1172 if (sdkp
->device
->removable
) {
1173 sdkp
->media_present
= 0;
1178 static int media_not_present(struct scsi_disk
*sdkp
,
1179 struct scsi_sense_hdr
*sshdr
)
1181 if (!scsi_sense_valid(sshdr
))
1184 /* not invoked for commands that could return deferred errors */
1185 switch (sshdr
->sense_key
) {
1186 case UNIT_ATTENTION
:
1188 /* medium not present */
1189 if (sshdr
->asc
== 0x3A) {
1190 set_media_not_present(sdkp
);
1198 * sd_check_events - check media events
1199 * @disk: kernel device descriptor
1200 * @clearing: disk events currently being cleared
1202 * Returns mask of DISK_EVENT_*.
1204 * Note: this function is invoked from the block subsystem.
1206 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1208 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1209 struct scsi_device
*sdp
= sdkp
->device
;
1210 struct scsi_sense_hdr
*sshdr
= NULL
;
1213 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1216 * If the device is offline, don't send any commands - just pretend as
1217 * if the command failed. If the device ever comes back online, we
1218 * can deal with it then. It is only because of unrecoverable errors
1219 * that we would ever take a device offline in the first place.
1221 if (!scsi_device_online(sdp
)) {
1222 set_media_not_present(sdkp
);
1227 * Using TEST_UNIT_READY enables differentiation between drive with
1228 * no cartridge loaded - NOT READY, drive with changed cartridge -
1229 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1231 * Drives that auto spin down. eg iomega jaz 1G, will be started
1232 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1233 * sd_revalidate() is called.
1237 if (scsi_block_when_processing_errors(sdp
)) {
1238 retval
= scsi_autopm_get_device(sdp
);
1242 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1243 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1245 scsi_autopm_put_device(sdp
);
1248 /* failed to execute TUR, assume media not present */
1249 if (host_byte(retval
)) {
1250 set_media_not_present(sdkp
);
1254 if (media_not_present(sdkp
, sshdr
))
1258 * For removable scsi disk we have to recognise the presence
1259 * of a disk in the drive.
1261 if (!sdkp
->media_present
)
1263 sdkp
->media_present
= 1;
1266 * sdp->changed is set under the following conditions:
1268 * Medium present state has changed in either direction.
1269 * Device has indicated UNIT_ATTENTION.
1272 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1277 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1280 struct scsi_device
*sdp
= sdkp
->device
;
1281 struct scsi_sense_hdr sshdr
;
1283 if (!scsi_device_online(sdp
))
1287 for (retries
= 3; retries
> 0; --retries
) {
1288 unsigned char cmd
[10] = { 0 };
1290 cmd
[0] = SYNCHRONIZE_CACHE
;
1292 * Leave the rest of the command zero to indicate
1295 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1296 SD_FLUSH_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1302 sd_print_result(sdkp
, res
);
1303 if (driver_byte(res
) & DRIVER_SENSE
)
1304 sd_print_sense_hdr(sdkp
, &sshdr
);
1312 static void sd_rescan(struct device
*dev
)
1314 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1317 revalidate_disk(sdkp
->disk
);
1318 scsi_disk_put(sdkp
);
1323 #ifdef CONFIG_COMPAT
1325 * This gets directly called from VFS. When the ioctl
1326 * is not recognized we go back to the other translation paths.
1328 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1329 unsigned int cmd
, unsigned long arg
)
1331 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1334 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1339 * If we are in the middle of error recovery, don't let anyone
1340 * else try and use this device. Also, if error recovery fails, it
1341 * may try and take the device offline, in which case all further
1342 * access to the device is prohibited.
1344 if (!scsi_block_when_processing_errors(sdev
))
1347 if (sdev
->host
->hostt
->compat_ioctl
) {
1348 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1354 * Let the static ioctl translation table take care of it.
1356 return -ENOIOCTLCMD
;
1360 static const struct block_device_operations sd_fops
= {
1361 .owner
= THIS_MODULE
,
1363 .release
= sd_release
,
1365 .getgeo
= sd_getgeo
,
1366 #ifdef CONFIG_COMPAT
1367 .compat_ioctl
= sd_compat_ioctl
,
1369 .check_events
= sd_check_events
,
1370 .revalidate_disk
= sd_revalidate_disk
,
1371 .unlock_native_capacity
= sd_unlock_native_capacity
,
1375 * sd_eh_action - error handling callback
1376 * @scmd: sd-issued command that has failed
1377 * @eh_cmnd: The command that was sent during error handling
1378 * @eh_cmnd_len: Length of eh_cmnd in bytes
1379 * @eh_disp: The recovery disposition suggested by the midlayer
1381 * This function is called by the SCSI midlayer upon completion of
1382 * an error handling command (TEST UNIT READY, START STOP UNIT,
1383 * etc.) The command sent to the device by the error handler is
1384 * stored in eh_cmnd. The result of sending the eh command is
1385 * passed in eh_disp.
1387 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1388 int eh_cmnd_len
, int eh_disp
)
1390 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1392 if (!scsi_device_online(scmd
->device
) ||
1393 !scsi_medium_access_command(scmd
))
1397 * The device has timed out executing a medium access command.
1398 * However, the TEST UNIT READY command sent during error
1399 * handling completed successfully. Either the device is in the
1400 * process of recovering or has it suffered an internal failure
1401 * that prevents access to the storage medium.
1403 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1404 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1405 sdkp
->medium_access_timed_out
++;
1408 * If the device keeps failing read/write commands but TEST UNIT
1409 * READY always completes successfully we assume that medium
1410 * access is no longer possible and take the device offline.
1412 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1413 scmd_printk(KERN_ERR
, scmd
,
1414 "Medium access timeout failure. Offlining disk!\n");
1415 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1423 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1425 u64 start_lba
= blk_rq_pos(scmd
->request
);
1426 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1430 * resid is optional but mostly filled in. When it's unused,
1431 * its value is zero, so we assume the whole buffer transferred
1433 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1434 unsigned int good_bytes
;
1436 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1439 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1440 SCSI_SENSE_BUFFERSIZE
,
1445 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1448 if (scmd
->device
->sector_size
< 512) {
1449 /* only legitimate sector_size here is 256 */
1453 /* be careful ... don't want any overflows */
1454 u64 factor
= scmd
->device
->sector_size
/ 512;
1455 do_div(start_lba
, factor
);
1456 do_div(end_lba
, factor
);
1459 /* The bad lba was reported incorrectly, we have no idea where
1462 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1465 /* This computation should always be done in terms of
1466 * the resolution of the device's medium.
1468 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1469 return min(good_bytes
, transferred
);
1473 * sd_done - bottom half handler: called when the lower level
1474 * driver has completed (successfully or otherwise) a scsi command.
1475 * @SCpnt: mid-level's per command structure.
1477 * Note: potentially run from within an ISR. Must not block.
1479 static int sd_done(struct scsi_cmnd
*SCpnt
)
1481 int result
= SCpnt
->result
;
1482 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1483 struct scsi_sense_hdr sshdr
;
1484 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1485 int sense_valid
= 0;
1486 int sense_deferred
= 0;
1487 unsigned char op
= SCpnt
->cmnd
[0];
1489 if ((SCpnt
->request
->cmd_flags
& REQ_DISCARD
) && !result
)
1490 scsi_set_resid(SCpnt
, 0);
1493 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1495 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1497 #ifdef CONFIG_SCSI_LOGGING
1498 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1500 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1501 "sd_done: sb[respc,sk,asc,"
1502 "ascq]=%x,%x,%x,%x\n",
1503 sshdr
.response_code
,
1504 sshdr
.sense_key
, sshdr
.asc
,
1508 if (driver_byte(result
) != DRIVER_SENSE
&&
1509 (!sense_valid
|| sense_deferred
))
1512 sdkp
->medium_access_timed_out
= 0;
1514 switch (sshdr
.sense_key
) {
1515 case HARDWARE_ERROR
:
1517 good_bytes
= sd_completed_bytes(SCpnt
);
1519 case RECOVERED_ERROR
:
1520 good_bytes
= scsi_bufflen(SCpnt
);
1523 /* This indicates a false check condition, so ignore it. An
1524 * unknown amount of data was transferred so treat it as an
1527 scsi_print_sense("sd", SCpnt
);
1529 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1531 case ABORTED_COMMAND
:
1532 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1533 good_bytes
= sd_completed_bytes(SCpnt
);
1535 case ILLEGAL_REQUEST
:
1536 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1537 good_bytes
= sd_completed_bytes(SCpnt
);
1538 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1539 if ((sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1540 (op
== UNMAP
|| op
== WRITE_SAME_16
|| op
== WRITE_SAME
))
1541 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1547 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1548 sd_dif_complete(SCpnt
, good_bytes
);
1550 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1551 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1553 /* We have to print a failed command here as the
1554 * extended CDB gets freed before scsi_io_completion()
1558 scsi_print_command(SCpnt
);
1560 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1569 * spinup disk - called only in sd_revalidate_disk()
1572 sd_spinup_disk(struct scsi_disk
*sdkp
)
1574 unsigned char cmd
[10];
1575 unsigned long spintime_expire
= 0;
1576 int retries
, spintime
;
1577 unsigned int the_result
;
1578 struct scsi_sense_hdr sshdr
;
1579 int sense_valid
= 0;
1583 /* Spin up drives, as required. Only do this at boot time */
1584 /* Spinup needs to be done for module loads too. */
1589 cmd
[0] = TEST_UNIT_READY
;
1590 memset((void *) &cmd
[1], 0, 9);
1592 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1595 SD_MAX_RETRIES
, NULL
);
1598 * If the drive has indicated to us that it
1599 * doesn't have any media in it, don't bother
1600 * with any more polling.
1602 if (media_not_present(sdkp
, &sshdr
))
1606 sense_valid
= scsi_sense_valid(&sshdr
);
1608 } while (retries
< 3 &&
1609 (!scsi_status_is_good(the_result
) ||
1610 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1611 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1613 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1614 /* no sense, TUR either succeeded or failed
1615 * with a status error */
1616 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1617 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1618 sd_print_result(sdkp
, the_result
);
1624 * The device does not want the automatic start to be issued.
1626 if (sdkp
->device
->no_start_on_add
)
1629 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1630 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1631 break; /* manual intervention required */
1632 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1633 break; /* standby */
1634 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1635 break; /* unavailable */
1637 * Issue command to spin up drive when not ready
1640 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1641 cmd
[0] = START_STOP
;
1642 cmd
[1] = 1; /* Return immediately */
1643 memset((void *) &cmd
[2], 0, 8);
1644 cmd
[4] = 1; /* Start spin cycle */
1645 if (sdkp
->device
->start_stop_pwr_cond
)
1647 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1649 SD_TIMEOUT
, SD_MAX_RETRIES
,
1651 spintime_expire
= jiffies
+ 100 * HZ
;
1654 /* Wait 1 second for next try */
1659 * Wait for USB flash devices with slow firmware.
1660 * Yes, this sense key/ASC combination shouldn't
1661 * occur here. It's characteristic of these devices.
1663 } else if (sense_valid
&&
1664 sshdr
.sense_key
== UNIT_ATTENTION
&&
1665 sshdr
.asc
== 0x28) {
1667 spintime_expire
= jiffies
+ 5 * HZ
;
1670 /* Wait 1 second for next try */
1673 /* we don't understand the sense code, so it's
1674 * probably pointless to loop */
1676 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1677 sd_print_sense_hdr(sdkp
, &sshdr
);
1682 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1685 if (scsi_status_is_good(the_result
))
1688 printk("not responding...\n");
1694 * Determine whether disk supports Data Integrity Field.
1696 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1698 struct scsi_device
*sdp
= sdkp
->device
;
1702 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1705 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1707 if (type
> SD_DIF_TYPE3_PROTECTION
)
1709 else if (scsi_host_dif_capable(sdp
->host
, type
))
1712 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1715 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1716 " protection type %u. Disabling disk!\n",
1720 sd_printk(KERN_NOTICE
, sdkp
,
1721 "Enabling DIF Type %u protection\n", type
);
1724 sd_printk(KERN_NOTICE
, sdkp
,
1725 "Disabling DIF Type %u protection\n", type
);
1729 sdkp
->protection_type
= type
;
1734 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1735 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1738 sd_print_result(sdkp
, the_result
);
1739 if (driver_byte(the_result
) & DRIVER_SENSE
)
1740 sd_print_sense_hdr(sdkp
, sshdr
);
1742 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1745 * Set dirty bit for removable devices if not ready -
1746 * sometimes drives will not report this properly.
1748 if (sdp
->removable
&&
1749 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1750 set_media_not_present(sdkp
);
1753 * We used to set media_present to 0 here to indicate no media
1754 * in the drive, but some drives fail read capacity even with
1755 * media present, so we can't do that.
1757 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1761 #if RC16_LEN > SD_BUF_SIZE
1762 #error RC16_LEN must not be more than SD_BUF_SIZE
1765 #define READ_CAPACITY_RETRIES_ON_RESET 10
1767 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1768 unsigned char *buffer
)
1770 unsigned char cmd
[16];
1771 struct scsi_sense_hdr sshdr
;
1772 int sense_valid
= 0;
1774 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1775 unsigned int alignment
;
1776 unsigned long long lba
;
1777 unsigned sector_size
;
1779 if (sdp
->no_read_capacity_16
)
1784 cmd
[0] = SERVICE_ACTION_IN
;
1785 cmd
[1] = SAI_READ_CAPACITY_16
;
1787 memset(buffer
, 0, RC16_LEN
);
1789 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1790 buffer
, RC16_LEN
, &sshdr
,
1791 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1793 if (media_not_present(sdkp
, &sshdr
))
1797 sense_valid
= scsi_sense_valid(&sshdr
);
1799 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1800 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1802 /* Invalid Command Operation Code or
1803 * Invalid Field in CDB, just retry
1804 * silently with RC10 */
1807 sshdr
.sense_key
== UNIT_ATTENTION
&&
1808 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1809 /* Device reset might occur several times,
1810 * give it one more chance */
1811 if (--reset_retries
> 0)
1816 } while (the_result
&& retries
);
1819 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1820 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1824 sector_size
= get_unaligned_be32(&buffer
[8]);
1825 lba
= get_unaligned_be64(&buffer
[0]);
1827 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
1832 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1833 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1834 "kernel compiled with support for large block "
1840 /* Logical blocks per physical block exponent */
1841 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1843 /* Lowest aligned logical block */
1844 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1845 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1846 if (alignment
&& sdkp
->first_scan
)
1847 sd_printk(KERN_NOTICE
, sdkp
,
1848 "physical block alignment offset: %u\n", alignment
);
1850 if (buffer
[14] & 0x80) { /* LBPME */
1853 if (buffer
[14] & 0x40) /* LBPRZ */
1856 sd_config_discard(sdkp
, SD_LBP_WS16
);
1859 sdkp
->capacity
= lba
+ 1;
1863 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1864 unsigned char *buffer
)
1866 unsigned char cmd
[16];
1867 struct scsi_sense_hdr sshdr
;
1868 int sense_valid
= 0;
1870 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1872 unsigned sector_size
;
1875 cmd
[0] = READ_CAPACITY
;
1876 memset(&cmd
[1], 0, 9);
1877 memset(buffer
, 0, 8);
1879 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1881 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1883 if (media_not_present(sdkp
, &sshdr
))
1887 sense_valid
= scsi_sense_valid(&sshdr
);
1889 sshdr
.sense_key
== UNIT_ATTENTION
&&
1890 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1891 /* Device reset might occur several times,
1892 * give it one more chance */
1893 if (--reset_retries
> 0)
1898 } while (the_result
&& retries
);
1901 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1902 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1906 sector_size
= get_unaligned_be32(&buffer
[4]);
1907 lba
= get_unaligned_be32(&buffer
[0]);
1909 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
1910 /* Some buggy (usb cardreader) devices return an lba of
1911 0xffffffff when the want to report a size of 0 (with
1912 which they really mean no media is present) */
1914 sdkp
->physical_block_size
= sector_size
;
1918 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1919 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1920 "kernel compiled with support for large block "
1926 sdkp
->capacity
= lba
+ 1;
1927 sdkp
->physical_block_size
= sector_size
;
1931 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1933 if (sdp
->host
->max_cmd_len
< 16)
1935 if (sdp
->try_rc_10_first
)
1937 if (sdp
->scsi_level
> SCSI_SPC_2
)
1939 if (scsi_device_protection(sdp
))
1945 * read disk capacity
1948 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1951 struct scsi_device
*sdp
= sdkp
->device
;
1952 sector_t old_capacity
= sdkp
->capacity
;
1954 if (sd_try_rc16_first(sdp
)) {
1955 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1956 if (sector_size
== -EOVERFLOW
)
1958 if (sector_size
== -ENODEV
)
1960 if (sector_size
< 0)
1961 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1962 if (sector_size
< 0)
1965 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1966 if (sector_size
== -EOVERFLOW
)
1968 if (sector_size
< 0)
1970 if ((sizeof(sdkp
->capacity
) > 4) &&
1971 (sdkp
->capacity
> 0xffffffffULL
)) {
1972 int old_sector_size
= sector_size
;
1973 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1974 "Trying to use READ CAPACITY(16).\n");
1975 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1976 if (sector_size
< 0) {
1977 sd_printk(KERN_NOTICE
, sdkp
,
1978 "Using 0xffffffff as device size\n");
1979 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1980 sector_size
= old_sector_size
;
1986 /* Some devices are known to return the total number of blocks,
1987 * not the highest block number. Some devices have versions
1988 * which do this and others which do not. Some devices we might
1989 * suspect of doing this but we don't know for certain.
1991 * If we know the reported capacity is wrong, decrement it. If
1992 * we can only guess, then assume the number of blocks is even
1993 * (usually true but not always) and err on the side of lowering
1996 if (sdp
->fix_capacity
||
1997 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1998 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1999 "from its reported value: %llu\n",
2000 (unsigned long long) sdkp
->capacity
);
2005 if (sector_size
== 0) {
2007 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2011 if (sector_size
!= 512 &&
2012 sector_size
!= 1024 &&
2013 sector_size
!= 2048 &&
2014 sector_size
!= 4096 &&
2015 sector_size
!= 256) {
2016 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2019 * The user might want to re-format the drive with
2020 * a supported sectorsize. Once this happens, it
2021 * would be relatively trivial to set the thing up.
2022 * For this reason, we leave the thing in the table.
2026 * set a bogus sector size so the normal read/write
2027 * logic in the block layer will eventually refuse any
2028 * request on this device without tripping over power
2029 * of two sector size assumptions
2033 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2036 char cap_str_2
[10], cap_str_10
[10];
2037 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2039 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2041 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2042 sizeof(cap_str_10
));
2044 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2045 sd_printk(KERN_NOTICE
, sdkp
,
2046 "%llu %d-byte logical blocks: (%s/%s)\n",
2047 (unsigned long long)sdkp
->capacity
,
2048 sector_size
, cap_str_10
, cap_str_2
);
2050 if (sdkp
->physical_block_size
!= sector_size
)
2051 sd_printk(KERN_NOTICE
, sdkp
,
2052 "%u-byte physical blocks\n",
2053 sdkp
->physical_block_size
);
2057 /* Rescale capacity to 512-byte units */
2058 if (sector_size
== 4096)
2059 sdkp
->capacity
<<= 3;
2060 else if (sector_size
== 2048)
2061 sdkp
->capacity
<<= 2;
2062 else if (sector_size
== 1024)
2063 sdkp
->capacity
<<= 1;
2064 else if (sector_size
== 256)
2065 sdkp
->capacity
>>= 1;
2067 blk_queue_physical_block_size(sdp
->request_queue
,
2068 sdkp
->physical_block_size
);
2069 sdkp
->device
->sector_size
= sector_size
;
2072 /* called with buffer of length 512 */
2074 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2075 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2076 struct scsi_sense_hdr
*sshdr
)
2078 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2079 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2084 * read write protect setting, if possible - called only in sd_revalidate_disk()
2085 * called with buffer of length SD_BUF_SIZE
2088 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2091 struct scsi_device
*sdp
= sdkp
->device
;
2092 struct scsi_mode_data data
;
2093 int old_wp
= sdkp
->write_prot
;
2095 set_disk_ro(sdkp
->disk
, 0);
2096 if (sdp
->skip_ms_page_3f
) {
2097 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2101 if (sdp
->use_192_bytes_for_3f
) {
2102 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2105 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2106 * We have to start carefully: some devices hang if we ask
2107 * for more than is available.
2109 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2112 * Second attempt: ask for page 0 When only page 0 is
2113 * implemented, a request for page 3F may return Sense Key
2114 * 5: Illegal Request, Sense Code 24: Invalid field in
2117 if (!scsi_status_is_good(res
))
2118 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2121 * Third attempt: ask 255 bytes, as we did earlier.
2123 if (!scsi_status_is_good(res
))
2124 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2128 if (!scsi_status_is_good(res
)) {
2129 sd_printk(KERN_WARNING
, sdkp
,
2130 "Test WP failed, assume Write Enabled\n");
2132 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2133 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2134 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2135 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2136 sdkp
->write_prot
? "on" : "off");
2137 sd_printk(KERN_DEBUG
, sdkp
,
2138 "Mode Sense: %02x %02x %02x %02x\n",
2139 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2145 * sd_read_cache_type - called only from sd_revalidate_disk()
2146 * called with buffer of length SD_BUF_SIZE
2149 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2152 struct scsi_device
*sdp
= sdkp
->device
;
2157 struct scsi_mode_data data
;
2158 struct scsi_sense_hdr sshdr
;
2159 int old_wce
= sdkp
->WCE
;
2160 int old_rcd
= sdkp
->RCD
;
2161 int old_dpofua
= sdkp
->DPOFUA
;
2164 if (sdp
->skip_ms_page_8
) {
2165 if (sdp
->type
== TYPE_RBC
)
2168 if (sdp
->skip_ms_page_3f
)
2171 if (sdp
->use_192_bytes_for_3f
)
2175 } else if (sdp
->type
== TYPE_RBC
) {
2183 /* cautiously ask */
2184 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2187 if (!scsi_status_is_good(res
))
2190 if (!data
.header_length
) {
2193 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2196 /* that went OK, now ask for the proper length */
2200 * We're only interested in the first three bytes, actually.
2201 * But the data cache page is defined for the first 20.
2205 else if (len
> SD_BUF_SIZE
) {
2206 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2207 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2210 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2214 if (len
> first_len
)
2215 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2218 if (scsi_status_is_good(res
)) {
2219 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2221 while (offset
< len
) {
2222 u8 page_code
= buffer
[offset
] & 0x3F;
2223 u8 spf
= buffer
[offset
] & 0x40;
2225 if (page_code
== 8 || page_code
== 6) {
2226 /* We're interested only in the first 3 bytes.
2228 if (len
- offset
<= 2) {
2229 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2230 "mode parameter data\n");
2233 modepage
= page_code
;
2237 /* Go to the next page */
2238 if (spf
&& len
- offset
> 3)
2239 offset
+= 4 + (buffer
[offset
+2] << 8) +
2241 else if (!spf
&& len
- offset
> 1)
2242 offset
+= 2 + buffer
[offset
+1];
2244 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2245 "mode parameter data\n");
2251 if (modepage
== 0x3F) {
2252 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page "
2255 } else if ((buffer
[offset
] & 0x3f) != modepage
) {
2256 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
2260 if (modepage
== 8) {
2261 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2262 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2264 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2268 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2269 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2270 sd_printk(KERN_NOTICE
, sdkp
,
2271 "Uses READ/WRITE(6), disabling FUA\n");
2275 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2276 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2277 sd_printk(KERN_NOTICE
, sdkp
,
2278 "Write cache: %s, read cache: %s, %s\n",
2279 sdkp
->WCE
? "enabled" : "disabled",
2280 sdkp
->RCD
? "disabled" : "enabled",
2281 sdkp
->DPOFUA
? "supports DPO and FUA"
2282 : "doesn't support DPO or FUA");
2288 if (scsi_sense_valid(&sshdr
) &&
2289 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2290 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2291 /* Invalid field in CDB */
2292 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2294 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2297 if (sdp
->wce_default_on
) {
2298 sd_printk(KERN_NOTICE
, sdkp
, "Assuming drive cache: write back\n");
2301 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2309 * The ATO bit indicates whether the DIF application tag is available
2310 * for use by the operating system.
2312 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2315 struct scsi_device
*sdp
= sdkp
->device
;
2316 struct scsi_mode_data data
;
2317 struct scsi_sense_hdr sshdr
;
2319 if (sdp
->type
!= TYPE_DISK
)
2322 if (sdkp
->protection_type
== 0)
2325 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2326 SD_MAX_RETRIES
, &data
, &sshdr
);
2328 if (!scsi_status_is_good(res
) || !data
.header_length
||
2330 sd_printk(KERN_WARNING
, sdkp
,
2331 "getting Control mode page failed, assume no ATO\n");
2333 if (scsi_sense_valid(&sshdr
))
2334 sd_print_sense_hdr(sdkp
, &sshdr
);
2339 offset
= data
.header_length
+ data
.block_descriptor_length
;
2341 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2342 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2346 if ((buffer
[offset
+ 5] & 0x80) == 0)
2355 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2356 * @disk: disk to query
2358 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2360 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2361 const int vpd_len
= 64;
2362 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2365 /* Block Limits VPD */
2366 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2369 blk_queue_io_min(sdkp
->disk
->queue
,
2370 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2371 blk_queue_io_opt(sdkp
->disk
->queue
,
2372 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2374 if (buffer
[3] == 0x3c) {
2375 unsigned int lba_count
, desc_count
;
2377 sdkp
->max_ws_blocks
=
2378 (u32
) min_not_zero(get_unaligned_be64(&buffer
[36]),
2384 lba_count
= get_unaligned_be32(&buffer
[20]);
2385 desc_count
= get_unaligned_be32(&buffer
[24]);
2387 if (lba_count
&& desc_count
)
2388 sdkp
->max_unmap_blocks
= lba_count
;
2390 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2392 if (buffer
[32] & 0x80)
2393 sdkp
->unmap_alignment
=
2394 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2396 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2398 if (sdkp
->max_unmap_blocks
)
2399 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2401 sd_config_discard(sdkp
, SD_LBP_WS16
);
2403 } else { /* LBP VPD page tells us what to use */
2405 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2406 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2407 else if (sdkp
->lbpws
)
2408 sd_config_discard(sdkp
, SD_LBP_WS16
);
2409 else if (sdkp
->lbpws10
)
2410 sd_config_discard(sdkp
, SD_LBP_WS10
);
2412 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2421 * sd_read_block_characteristics - Query block dev. characteristics
2422 * @disk: disk to query
2424 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2426 unsigned char *buffer
;
2428 const int vpd_len
= 64;
2430 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2433 /* Block Device Characteristics VPD */
2434 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2437 rot
= get_unaligned_be16(&buffer
[4]);
2440 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2447 * sd_read_block_provisioning - Query provisioning VPD page
2448 * @disk: disk to query
2450 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2452 unsigned char *buffer
;
2453 const int vpd_len
= 8;
2455 if (sdkp
->lbpme
== 0)
2458 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2460 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2464 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2465 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2466 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2472 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2475 * Although VPD inquiries can go to SCSI-2 type devices,
2476 * some USB ones crash on receiving them, and the pages
2477 * we currently ask for are for SPC-3 and beyond
2479 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2485 * sd_revalidate_disk - called the first time a new disk is seen,
2486 * performs disk spin up, read_capacity, etc.
2487 * @disk: struct gendisk we care about
2489 static int sd_revalidate_disk(struct gendisk
*disk
)
2491 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2492 struct scsi_device
*sdp
= sdkp
->device
;
2493 unsigned char *buffer
;
2496 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2497 "sd_revalidate_disk\n"));
2500 * If the device is offline, don't try and read capacity or any
2501 * of the other niceties.
2503 if (!scsi_device_online(sdp
))
2506 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2508 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2509 "allocation failure.\n");
2513 sd_spinup_disk(sdkp
);
2516 * Without media there is no reason to ask; moreover, some devices
2517 * react badly if we do.
2519 if (sdkp
->media_present
) {
2520 sd_read_capacity(sdkp
, buffer
);
2522 if (sd_try_extended_inquiry(sdp
)) {
2523 sd_read_block_provisioning(sdkp
);
2524 sd_read_block_limits(sdkp
);
2525 sd_read_block_characteristics(sdkp
);
2528 sd_read_write_protect_flag(sdkp
, buffer
);
2529 sd_read_cache_type(sdkp
, buffer
);
2530 sd_read_app_tag_own(sdkp
, buffer
);
2533 sdkp
->first_scan
= 0;
2536 * We now have all cache related info, determine how we deal
2537 * with flush requests.
2545 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2547 set_capacity(disk
, sdkp
->capacity
);
2555 * sd_unlock_native_capacity - unlock native capacity
2556 * @disk: struct gendisk to set capacity for
2558 * Block layer calls this function if it detects that partitions
2559 * on @disk reach beyond the end of the device. If the SCSI host
2560 * implements ->unlock_native_capacity() method, it's invoked to
2561 * give it a chance to adjust the device capacity.
2564 * Defined by block layer. Might sleep.
2566 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2568 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2570 if (sdev
->host
->hostt
->unlock_native_capacity
)
2571 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2575 * sd_format_disk_name - format disk name
2576 * @prefix: name prefix - ie. "sd" for SCSI disks
2577 * @index: index of the disk to format name for
2578 * @buf: output buffer
2579 * @buflen: length of the output buffer
2581 * SCSI disk names starts at sda. The 26th device is sdz and the
2582 * 27th is sdaa. The last one for two lettered suffix is sdzz
2583 * which is followed by sdaaa.
2585 * This is basically 26 base counting with one extra 'nil' entry
2586 * at the beginning from the second digit on and can be
2587 * determined using similar method as 26 base conversion with the
2588 * index shifted -1 after each digit is computed.
2594 * 0 on success, -errno on failure.
2596 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2598 const int base
= 'z' - 'a' + 1;
2599 char *begin
= buf
+ strlen(prefix
);
2600 char *end
= buf
+ buflen
;
2610 *--p
= 'a' + (index
% unit
);
2611 index
= (index
/ unit
) - 1;
2612 } while (index
>= 0);
2614 memmove(begin
, p
, end
- p
);
2615 memcpy(buf
, prefix
, strlen(prefix
));
2621 * The asynchronous part of sd_probe
2623 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2625 struct scsi_disk
*sdkp
= data
;
2626 struct scsi_device
*sdp
;
2633 index
= sdkp
->index
;
2634 dev
= &sdp
->sdev_gendev
;
2636 gd
->major
= sd_major((index
& 0xf0) >> 4);
2637 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2638 gd
->minors
= SD_MINORS
;
2640 gd
->fops
= &sd_fops
;
2641 gd
->private_data
= &sdkp
->driver
;
2642 gd
->queue
= sdkp
->device
->request_queue
;
2644 /* defaults, until the device tells us otherwise */
2645 sdp
->sector_size
= 512;
2647 sdkp
->media_present
= 1;
2648 sdkp
->write_prot
= 0;
2652 sdkp
->first_scan
= 1;
2653 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2655 sd_revalidate_disk(gd
);
2657 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2658 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2660 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2661 gd
->flags
= GENHD_FL_EXT_DEVT
;
2662 if (sdp
->removable
) {
2663 gd
->flags
|= GENHD_FL_REMOVABLE
;
2664 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2669 sd_dif_config_host(sdkp
);
2671 sd_revalidate_disk(gd
);
2673 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2674 sdp
->removable
? "removable " : "");
2675 scsi_autopm_put_device(sdp
);
2676 put_device(&sdkp
->dev
);
2680 * sd_probe - called during driver initialization and whenever a
2681 * new scsi device is attached to the system. It is called once
2682 * for each scsi device (not just disks) present.
2683 * @dev: pointer to device object
2685 * Returns 0 if successful (or not interested in this scsi device
2686 * (e.g. scanner)); 1 when there is an error.
2688 * Note: this function is invoked from the scsi mid-level.
2689 * This function sets up the mapping between a given
2690 * <host,channel,id,lun> (found in sdp) and new device name
2691 * (e.g. /dev/sda). More precisely it is the block device major
2692 * and minor number that is chosen here.
2694 * Assume sd_probe is not re-entrant (for time being)
2695 * Also think about sd_probe() and sd_remove() running coincidentally.
2697 static int sd_probe(struct device
*dev
)
2699 struct scsi_device
*sdp
= to_scsi_device(dev
);
2700 struct scsi_disk
*sdkp
;
2706 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2709 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2713 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2717 gd
= alloc_disk(SD_MINORS
);
2722 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2725 spin_lock(&sd_index_lock
);
2726 error
= ida_get_new(&sd_index_ida
, &index
);
2727 spin_unlock(&sd_index_lock
);
2728 } while (error
== -EAGAIN
);
2731 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2735 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2737 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2738 goto out_free_index
;
2742 sdkp
->driver
= &sd_template
;
2744 sdkp
->index
= index
;
2745 atomic_set(&sdkp
->openers
, 0);
2746 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2748 if (!sdp
->request_queue
->rq_timeout
) {
2749 if (sdp
->type
!= TYPE_MOD
)
2750 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2752 blk_queue_rq_timeout(sdp
->request_queue
,
2756 device_initialize(&sdkp
->dev
);
2757 sdkp
->dev
.parent
= dev
;
2758 sdkp
->dev
.class = &sd_disk_class
;
2759 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2761 if (device_add(&sdkp
->dev
))
2762 goto out_free_index
;
2765 dev_set_drvdata(dev
, sdkp
);
2767 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2768 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2773 spin_lock(&sd_index_lock
);
2774 ida_remove(&sd_index_ida
, index
);
2775 spin_unlock(&sd_index_lock
);
2785 * sd_remove - called whenever a scsi disk (previously recognized by
2786 * sd_probe) is detached from the system. It is called (potentially
2787 * multiple times) during sd module unload.
2788 * @sdp: pointer to mid level scsi device object
2790 * Note: this function is invoked from the scsi mid-level.
2791 * This function potentially frees up a device name (e.g. /dev/sdc)
2792 * that could be re-used by a subsequent sd_probe().
2793 * This function is not called when the built-in sd driver is "exit-ed".
2795 static int sd_remove(struct device
*dev
)
2797 struct scsi_disk
*sdkp
;
2799 sdkp
= dev_get_drvdata(dev
);
2800 scsi_autopm_get_device(sdkp
->device
);
2802 async_synchronize_full_domain(&scsi_sd_probe_domain
);
2803 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2804 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2805 device_del(&sdkp
->dev
);
2806 del_gendisk(sdkp
->disk
);
2809 mutex_lock(&sd_ref_mutex
);
2810 dev_set_drvdata(dev
, NULL
);
2811 put_device(&sdkp
->dev
);
2812 mutex_unlock(&sd_ref_mutex
);
2818 * scsi_disk_release - Called to free the scsi_disk structure
2819 * @dev: pointer to embedded class device
2821 * sd_ref_mutex must be held entering this routine. Because it is
2822 * called on last put, you should always use the scsi_disk_get()
2823 * scsi_disk_put() helpers which manipulate the semaphore directly
2824 * and never do a direct put_device.
2826 static void scsi_disk_release(struct device
*dev
)
2828 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2829 struct gendisk
*disk
= sdkp
->disk
;
2831 spin_lock(&sd_index_lock
);
2832 ida_remove(&sd_index_ida
, sdkp
->index
);
2833 spin_unlock(&sd_index_lock
);
2835 disk
->private_data
= NULL
;
2837 put_device(&sdkp
->device
->sdev_gendev
);
2842 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2844 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2845 struct scsi_sense_hdr sshdr
;
2846 struct scsi_device
*sdp
= sdkp
->device
;
2850 cmd
[4] |= 1; /* START */
2852 if (sdp
->start_stop_pwr_cond
)
2853 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2855 if (!scsi_device_online(sdp
))
2858 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2859 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2861 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2862 sd_print_result(sdkp
, res
);
2863 if (driver_byte(res
) & DRIVER_SENSE
)
2864 sd_print_sense_hdr(sdkp
, &sshdr
);
2871 * Send a SYNCHRONIZE CACHE instruction down to the device through
2872 * the normal SCSI command structure. Wait for the command to
2875 static void sd_shutdown(struct device
*dev
)
2877 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2880 return; /* this can happen */
2882 if (pm_runtime_suspended(dev
))
2886 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2887 sd_sync_cache(sdkp
);
2890 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2891 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2892 sd_start_stop_device(sdkp
, 0);
2896 scsi_disk_put(sdkp
);
2899 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2901 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2905 return 0; /* this can happen */
2908 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2909 ret
= sd_sync_cache(sdkp
);
2914 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2915 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2916 ret
= sd_start_stop_device(sdkp
, 0);
2920 scsi_disk_put(sdkp
);
2924 static int sd_resume(struct device
*dev
)
2926 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2929 if (!sdkp
->device
->manage_start_stop
)
2932 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2933 ret
= sd_start_stop_device(sdkp
, 1);
2936 scsi_disk_put(sdkp
);
2941 * init_sd - entry point for this driver (both when built in or when
2944 * Note: this function registers this driver with the scsi mid-level.
2946 static int __init
init_sd(void)
2948 int majors
= 0, i
, err
;
2950 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2952 for (i
= 0; i
< SD_MAJORS
; i
++)
2953 if (register_blkdev(sd_major(i
), "sd") == 0)
2959 err
= class_register(&sd_disk_class
);
2963 err
= scsi_register_driver(&sd_template
.gendrv
);
2967 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2969 if (!sd_cdb_cache
) {
2970 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2974 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2976 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2983 kmem_cache_destroy(sd_cdb_cache
);
2986 class_unregister(&sd_disk_class
);
2988 for (i
= 0; i
< SD_MAJORS
; i
++)
2989 unregister_blkdev(sd_major(i
), "sd");
2994 * exit_sd - exit point for this driver (when it is a module).
2996 * Note: this function unregisters this driver from the scsi mid-level.
2998 static void __exit
exit_sd(void)
3002 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3004 mempool_destroy(sd_cdb_pool
);
3005 kmem_cache_destroy(sd_cdb_cache
);
3007 scsi_unregister_driver(&sd_template
.gendrv
);
3008 class_unregister(&sd_disk_class
);
3010 for (i
= 0; i
< SD_MAJORS
; i
++)
3011 unregister_blkdev(sd_major(i
), "sd");
3014 module_init(init_sd
);
3015 module_exit(exit_sd
);
3017 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3018 struct scsi_sense_hdr
*sshdr
)
3020 sd_printk(KERN_INFO
, sdkp
, " ");
3021 scsi_show_sense_hdr(sshdr
);
3022 sd_printk(KERN_INFO
, sdkp
, " ");
3023 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3026 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3028 sd_printk(KERN_INFO
, sdkp
, " ");
3029 scsi_show_result(result
);