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 void sd_config_write_same(struct scsi_disk
*);
103 static int sd_revalidate_disk(struct gendisk
*);
104 static void sd_unlock_native_capacity(struct gendisk
*disk
);
105 static int sd_probe(struct device
*);
106 static int sd_remove(struct device
*);
107 static void sd_shutdown(struct device
*);
108 static int sd_suspend(struct device
*);
109 static int sd_resume(struct device
*);
110 static void sd_rescan(struct device
*);
111 static int sd_done(struct scsi_cmnd
*);
112 static int sd_eh_action(struct scsi_cmnd
*, unsigned char *, int, int);
113 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
114 static void scsi_disk_release(struct device
*cdev
);
115 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
116 static void sd_print_result(struct scsi_disk
*, int);
118 static DEFINE_SPINLOCK(sd_index_lock
);
119 static DEFINE_IDA(sd_index_ida
);
121 /* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
124 static DEFINE_MUTEX(sd_ref_mutex
);
126 static struct kmem_cache
*sd_cdb_cache
;
127 static mempool_t
*sd_cdb_pool
;
129 static const char *sd_cache_types
[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
135 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
136 const char *buf
, size_t count
)
138 int i
, ct
= -1, rcd
, wce
, sp
;
139 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
140 struct scsi_device
*sdp
= sdkp
->device
;
143 struct scsi_mode_data data
;
144 struct scsi_sense_hdr sshdr
;
145 static const char temp
[] = "temporary ";
148 if (sdp
->type
!= TYPE_DISK
)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
154 if (strncmp(buf
, temp
, sizeof(temp
) - 1) == 0) {
155 buf
+= sizeof(temp
) - 1;
156 sdkp
->cache_override
= 1;
158 sdkp
->cache_override
= 0;
161 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
162 len
= strlen(sd_cache_types
[i
]);
163 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
171 rcd
= ct
& 0x01 ? 1 : 0;
172 wce
= ct
& 0x02 ? 1 : 0;
174 if (sdkp
->cache_override
) {
180 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
181 SD_MAX_RETRIES
, &data
, NULL
))
183 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
184 data
.block_descriptor_length
);
185 buffer_data
= buffer
+ data
.header_length
+
186 data
.block_descriptor_length
;
187 buffer_data
[2] &= ~0x05;
188 buffer_data
[2] |= wce
<< 2 | rcd
;
189 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
191 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
192 SD_MAX_RETRIES
, &data
, &sshdr
)) {
193 if (scsi_sense_valid(&sshdr
))
194 sd_print_sense_hdr(sdkp
, &sshdr
);
197 revalidate_disk(sdkp
->disk
);
202 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
203 const char *buf
, size_t count
)
205 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
206 struct scsi_device
*sdp
= sdkp
->device
;
208 if (!capable(CAP_SYS_ADMIN
))
211 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
217 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
218 const char *buf
, size_t count
)
220 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
221 struct scsi_device
*sdp
= sdkp
->device
;
223 if (!capable(CAP_SYS_ADMIN
))
226 if (sdp
->type
!= TYPE_DISK
)
229 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
235 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
238 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
239 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
241 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
245 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
247 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
249 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
253 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
256 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
257 struct scsi_device
*sdp
= sdkp
->device
;
259 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
263 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
266 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
268 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
272 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
275 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
277 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
281 sd_store_protection_type(struct device
*dev
, struct device_attribute
*attr
,
282 const char *buf
, size_t count
)
284 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
288 if (!capable(CAP_SYS_ADMIN
))
291 err
= kstrtouint(buf
, 10, &val
);
296 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
297 sdkp
->protection_type
= val
;
303 sd_show_protection_mode(struct device
*dev
, struct device_attribute
*attr
,
306 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
307 struct scsi_device
*sdp
= sdkp
->device
;
308 unsigned int dif
, dix
;
310 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
311 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
313 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
319 return snprintf(buf
, 20, "none\n");
321 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
325 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
328 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
330 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
334 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
337 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
339 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
342 static const char *lbp_mode
[] = {
343 [SD_LBP_FULL
] = "full",
344 [SD_LBP_UNMAP
] = "unmap",
345 [SD_LBP_WS16
] = "writesame_16",
346 [SD_LBP_WS10
] = "writesame_10",
347 [SD_LBP_ZERO
] = "writesame_zero",
348 [SD_LBP_DISABLE
] = "disabled",
352 sd_show_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
355 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
357 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
361 sd_store_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
362 const char *buf
, size_t count
)
364 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
365 struct scsi_device
*sdp
= sdkp
->device
;
367 if (!capable(CAP_SYS_ADMIN
))
370 if (sdp
->type
!= TYPE_DISK
)
373 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
374 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
375 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
376 sd_config_discard(sdkp
, SD_LBP_WS16
);
377 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
378 sd_config_discard(sdkp
, SD_LBP_WS10
);
379 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
380 sd_config_discard(sdkp
, SD_LBP_ZERO
);
381 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
382 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
390 sd_show_max_medium_access_timeouts(struct device
*dev
,
391 struct device_attribute
*attr
, char *buf
)
393 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
395 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
399 sd_store_max_medium_access_timeouts(struct device
*dev
,
400 struct device_attribute
*attr
,
401 const char *buf
, size_t count
)
403 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
406 if (!capable(CAP_SYS_ADMIN
))
409 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
411 return err
? err
: count
;
415 sd_show_write_same_blocks(struct device
*dev
, struct device_attribute
*attr
,
418 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
420 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
424 sd_store_write_same_blocks(struct device
*dev
, struct device_attribute
*attr
,
425 const char *buf
, size_t count
)
427 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
428 struct scsi_device
*sdp
= sdkp
->device
;
432 if (!capable(CAP_SYS_ADMIN
))
435 if (sdp
->type
!= TYPE_DISK
)
438 err
= kstrtoul(buf
, 10, &max
);
444 sdp
->no_write_same
= 1;
445 else if (max
<= SD_MAX_WS16_BLOCKS
) {
446 sdp
->no_write_same
= 0;
447 sdkp
->max_ws_blocks
= max
;
450 sd_config_write_same(sdkp
);
455 static struct device_attribute sd_disk_attrs
[] = {
456 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
457 sd_store_cache_type
),
458 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
459 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
460 sd_store_allow_restart
),
461 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
462 sd_store_manage_start_stop
),
463 __ATTR(protection_type
, S_IRUGO
|S_IWUSR
, sd_show_protection_type
,
464 sd_store_protection_type
),
465 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
466 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
467 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
468 __ATTR(provisioning_mode
, S_IRUGO
|S_IWUSR
, sd_show_provisioning_mode
,
469 sd_store_provisioning_mode
),
470 __ATTR(max_write_same_blocks
, S_IRUGO
|S_IWUSR
,
471 sd_show_write_same_blocks
, sd_store_write_same_blocks
),
472 __ATTR(max_medium_access_timeouts
, S_IRUGO
|S_IWUSR
,
473 sd_show_max_medium_access_timeouts
,
474 sd_store_max_medium_access_timeouts
),
478 static struct class sd_disk_class
= {
480 .owner
= THIS_MODULE
,
481 .dev_release
= scsi_disk_release
,
482 .dev_attrs
= sd_disk_attrs
,
485 static const struct dev_pm_ops sd_pm_ops
= {
486 .suspend
= sd_suspend
,
488 .poweroff
= sd_suspend
,
489 .restore
= sd_resume
,
490 .runtime_suspend
= sd_suspend
,
491 .runtime_resume
= sd_resume
,
494 static struct scsi_driver sd_template
= {
495 .owner
= THIS_MODULE
,
500 .shutdown
= sd_shutdown
,
505 .eh_action
= sd_eh_action
,
509 * Device no to disk mapping:
511 * major disc2 disc p1
512 * |............|.............|....|....| <- dev_t
515 * Inside a major, we have 16k disks, however mapped non-
516 * contiguously. The first 16 disks are for major0, the next
517 * ones with major1, ... Disk 256 is for major0 again, disk 272
519 * As we stay compatible with our numbering scheme, we can reuse
520 * the well-know SCSI majors 8, 65--71, 136--143.
522 static int sd_major(int major_idx
)
526 return SCSI_DISK0_MAJOR
;
528 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
530 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
533 return 0; /* shut up gcc */
537 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
539 struct scsi_disk
*sdkp
= NULL
;
541 if (disk
->private_data
) {
542 sdkp
= scsi_disk(disk
);
543 if (scsi_device_get(sdkp
->device
) == 0)
544 get_device(&sdkp
->dev
);
551 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
553 struct scsi_disk
*sdkp
;
555 mutex_lock(&sd_ref_mutex
);
556 sdkp
= __scsi_disk_get(disk
);
557 mutex_unlock(&sd_ref_mutex
);
561 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
563 struct scsi_disk
*sdkp
;
565 mutex_lock(&sd_ref_mutex
);
566 sdkp
= dev_get_drvdata(dev
);
568 sdkp
= __scsi_disk_get(sdkp
->disk
);
569 mutex_unlock(&sd_ref_mutex
);
573 static void scsi_disk_put(struct scsi_disk
*sdkp
)
575 struct scsi_device
*sdev
= sdkp
->device
;
577 mutex_lock(&sd_ref_mutex
);
578 put_device(&sdkp
->dev
);
579 scsi_device_put(sdev
);
580 mutex_unlock(&sd_ref_mutex
);
583 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
585 unsigned int prot_op
= SCSI_PROT_NORMAL
;
586 unsigned int dix
= scsi_prot_sg_count(scmd
);
588 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
590 prot_op
= SCSI_PROT_READ_PASS
;
591 else if (dif
&& !dix
)
592 prot_op
= SCSI_PROT_READ_STRIP
;
593 else if (!dif
&& dix
)
594 prot_op
= SCSI_PROT_READ_INSERT
;
597 prot_op
= SCSI_PROT_WRITE_PASS
;
598 else if (dif
&& !dix
)
599 prot_op
= SCSI_PROT_WRITE_INSERT
;
600 else if (!dif
&& dix
)
601 prot_op
= SCSI_PROT_WRITE_STRIP
;
604 scsi_set_prot_op(scmd
, prot_op
);
605 scsi_set_prot_type(scmd
, dif
);
608 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
610 struct request_queue
*q
= sdkp
->disk
->queue
;
611 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
612 unsigned int max_blocks
= 0;
614 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
615 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
617 q
->limits
.discard_granularity
=
618 max(sdkp
->physical_block_size
,
619 sdkp
->unmap_granularity
* logical_block_size
);
621 sdkp
->provisioning_mode
= mode
;
626 q
->limits
.max_discard_sectors
= 0;
627 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
631 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
632 (u32
)SD_MAX_WS16_BLOCKS
);
636 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
637 (u32
)SD_MAX_WS16_BLOCKS
);
641 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
642 (u32
)SD_MAX_WS10_BLOCKS
);
646 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
647 (u32
)SD_MAX_WS10_BLOCKS
);
648 q
->limits
.discard_zeroes_data
= 1;
652 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
653 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
657 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
658 * @sdp: scsi device to operate one
659 * @rq: Request to prepare
661 * Will issue either UNMAP or WRITE SAME(16) depending on preference
662 * indicated by target device.
664 static int sd_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
666 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
667 sector_t sector
= blk_rq_pos(rq
);
668 unsigned int nr_sectors
= blk_rq_sectors(rq
);
669 unsigned int nr_bytes
= blk_rq_bytes(rq
);
675 sector
>>= ilog2(sdp
->sector_size
) - 9;
676 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
677 rq
->timeout
= SD_TIMEOUT
;
679 memset(rq
->cmd
, 0, rq
->cmd_len
);
681 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
683 return BLKPREP_DEFER
;
685 switch (sdkp
->provisioning_mode
) {
687 buf
= page_address(page
);
693 put_unaligned_be16(6 + 16, &buf
[0]);
694 put_unaligned_be16(16, &buf
[2]);
695 put_unaligned_be64(sector
, &buf
[8]);
696 put_unaligned_be32(nr_sectors
, &buf
[16]);
703 rq
->cmd
[0] = WRITE_SAME_16
;
704 rq
->cmd
[1] = 0x8; /* UNMAP */
705 put_unaligned_be64(sector
, &rq
->cmd
[2]);
706 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
708 len
= sdkp
->device
->sector_size
;
714 rq
->cmd
[0] = WRITE_SAME
;
715 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
716 rq
->cmd
[1] = 0x8; /* UNMAP */
717 put_unaligned_be32(sector
, &rq
->cmd
[2]);
718 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
720 len
= sdkp
->device
->sector_size
;
728 blk_add_request_payload(rq
, page
, len
);
729 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
730 rq
->buffer
= page_address(page
);
731 rq
->__data_len
= nr_bytes
;
734 if (ret
!= BLKPREP_OK
) {
741 static void sd_config_write_same(struct scsi_disk
*sdkp
)
743 struct request_queue
*q
= sdkp
->disk
->queue
;
744 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
746 if (sdkp
->device
->no_write_same
) {
747 sdkp
->max_ws_blocks
= 0;
751 /* Some devices can not handle block counts above 0xffff despite
752 * supporting WRITE SAME(16). Consequently we default to 64k
753 * blocks per I/O unless the device explicitly advertises a
756 if (sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
757 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
758 (u32
)SD_MAX_WS16_BLOCKS
);
759 else if (sdkp
->ws16
|| sdkp
->ws10
|| sdkp
->device
->no_report_opcodes
)
760 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
761 (u32
)SD_MAX_WS10_BLOCKS
);
763 sdkp
->device
->no_write_same
= 1;
764 sdkp
->max_ws_blocks
= 0;
768 blk_queue_max_write_same_sectors(q
, sdkp
->max_ws_blocks
*
769 (logical_block_size
>> 9));
773 * sd_setup_write_same_cmnd - write the same data to multiple blocks
774 * @sdp: scsi device to operate one
775 * @rq: Request to prepare
777 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
778 * preference indicated by target device.
780 static int sd_setup_write_same_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
782 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
783 struct bio
*bio
= rq
->bio
;
784 sector_t sector
= blk_rq_pos(rq
);
785 unsigned int nr_sectors
= blk_rq_sectors(rq
);
786 unsigned int nr_bytes
= blk_rq_bytes(rq
);
789 if (sdkp
->device
->no_write_same
)
792 BUG_ON(bio_offset(bio
) || bio_iovec(bio
)->bv_len
!= sdp
->sector_size
);
794 sector
>>= ilog2(sdp
->sector_size
) - 9;
795 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
797 rq
->__data_len
= sdp
->sector_size
;
798 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
799 memset(rq
->cmd
, 0, rq
->cmd_len
);
801 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
803 rq
->cmd
[0] = WRITE_SAME_16
;
804 put_unaligned_be64(sector
, &rq
->cmd
[2]);
805 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
808 rq
->cmd
[0] = WRITE_SAME
;
809 put_unaligned_be32(sector
, &rq
->cmd
[2]);
810 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
813 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
814 rq
->__data_len
= nr_bytes
;
819 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
821 rq
->timeout
= SD_FLUSH_TIMEOUT
;
822 rq
->retries
= SD_MAX_RETRIES
;
823 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
826 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
829 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
831 struct scsi_cmnd
*SCpnt
= rq
->special
;
833 if (rq
->cmd_flags
& REQ_DISCARD
) {
834 free_page((unsigned long)rq
->buffer
);
837 if (SCpnt
->cmnd
!= rq
->cmd
) {
838 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
845 * sd_prep_fn - build a scsi (read or write) command from
846 * information in the request structure.
847 * @SCpnt: pointer to mid-level's per scsi command structure that
848 * contains request and into which the scsi command is written
850 * Returns 1 if successful and 0 if error (or cannot be done now).
852 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
854 struct scsi_cmnd
*SCpnt
;
855 struct scsi_device
*sdp
= q
->queuedata
;
856 struct gendisk
*disk
= rq
->rq_disk
;
857 struct scsi_disk
*sdkp
;
858 sector_t block
= blk_rq_pos(rq
);
860 unsigned int this_count
= blk_rq_sectors(rq
);
862 unsigned char protect
;
865 * Discard request come in as REQ_TYPE_FS but we turn them into
866 * block PC requests to make life easier.
868 if (rq
->cmd_flags
& REQ_DISCARD
) {
869 ret
= sd_setup_discard_cmnd(sdp
, rq
);
871 } else if (rq
->cmd_flags
& REQ_WRITE_SAME
) {
872 ret
= sd_setup_write_same_cmnd(sdp
, rq
);
874 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
875 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
877 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
878 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
880 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
884 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
885 if (ret
!= BLKPREP_OK
)
888 sdkp
= scsi_disk(disk
);
890 /* from here on until we're complete, any goto out
891 * is used for a killable error condition */
894 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
895 "sd_prep_fn: block=%llu, "
897 (unsigned long long)block
,
900 if (!sdp
|| !scsi_device_online(sdp
) ||
901 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
902 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
903 "Finishing %u sectors\n",
904 blk_rq_sectors(rq
)));
905 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
906 "Retry with 0x%p\n", SCpnt
));
912 * quietly refuse to do anything to a changed disc until
913 * the changed bit has been reset
915 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
920 * Some SD card readers can't handle multi-sector accesses which touch
921 * the last one or two hardware sectors. Split accesses as needed.
923 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
924 (sdp
->sector_size
/ 512);
926 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
927 if (block
< threshold
) {
928 /* Access up to the threshold but not beyond */
929 this_count
= threshold
- block
;
931 /* Access only a single hardware sector */
932 this_count
= sdp
->sector_size
/ 512;
936 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
937 (unsigned long long)block
));
940 * If we have a 1K hardware sectorsize, prevent access to single
941 * 512 byte sectors. In theory we could handle this - in fact
942 * the scsi cdrom driver must be able to handle this because
943 * we typically use 1K blocksizes, and cdroms typically have
944 * 2K hardware sectorsizes. Of course, things are simpler
945 * with the cdrom, since it is read-only. For performance
946 * reasons, the filesystems should be able to handle this
947 * and not force the scsi disk driver to use bounce buffers
950 if (sdp
->sector_size
== 1024) {
951 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
952 scmd_printk(KERN_ERR
, SCpnt
,
953 "Bad block number requested\n");
957 this_count
= this_count
>> 1;
960 if (sdp
->sector_size
== 2048) {
961 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
962 scmd_printk(KERN_ERR
, SCpnt
,
963 "Bad block number requested\n");
967 this_count
= this_count
>> 2;
970 if (sdp
->sector_size
== 4096) {
971 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
972 scmd_printk(KERN_ERR
, SCpnt
,
973 "Bad block number requested\n");
977 this_count
= this_count
>> 3;
980 if (rq_data_dir(rq
) == WRITE
) {
981 if (!sdp
->writeable
) {
984 SCpnt
->cmnd
[0] = WRITE_6
;
985 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
987 if (blk_integrity_rq(rq
))
988 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
990 } else if (rq_data_dir(rq
) == READ
) {
991 SCpnt
->cmnd
[0] = READ_6
;
992 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
994 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
998 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
999 "%s %d/%u 512 byte blocks.\n",
1000 (rq_data_dir(rq
) == WRITE
) ?
1001 "writing" : "reading", this_count
,
1002 blk_rq_sectors(rq
)));
1004 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1005 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
1011 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
1012 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1014 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1015 ret
= BLKPREP_DEFER
;
1019 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1020 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1021 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1022 SCpnt
->cmnd
[7] = 0x18;
1023 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1024 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1027 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1028 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1029 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1030 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1031 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1032 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1033 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1034 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1036 /* Expected Indirect LBA */
1037 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1038 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1039 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1040 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1042 /* Transfer length */
1043 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1044 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1045 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1046 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1047 } else if (sdp
->use_16_for_rw
) {
1048 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1049 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1050 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1051 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1052 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1053 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1054 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1055 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1056 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1057 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1058 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1059 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1060 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1061 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1062 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1063 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1064 scsi_device_protection(SCpnt
->device
) ||
1065 SCpnt
->device
->use_10_for_rw
) {
1066 if (this_count
> 0xffff)
1067 this_count
= 0xffff;
1069 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1070 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1071 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1072 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1073 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1074 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1075 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1076 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1077 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1079 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1081 * This happens only if this drive failed
1082 * 10byte rw command with ILLEGAL_REQUEST
1083 * during operation and thus turned off
1086 scmd_printk(KERN_ERR
, SCpnt
,
1087 "FUA write on READ/WRITE(6) drive\n");
1091 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1092 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1093 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1094 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1097 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1099 /* If DIF or DIX is enabled, tell HBA how to handle request */
1100 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
1101 sd_prot_op(SCpnt
, host_dif
);
1104 * We shouldn't disconnect in the middle of a sector, so with a dumb
1105 * host adapter, it's safe to assume that we can at least transfer
1106 * this many bytes between each connect / disconnect.
1108 SCpnt
->transfersize
= sdp
->sector_size
;
1109 SCpnt
->underflow
= this_count
<< 9;
1110 SCpnt
->allowed
= SD_MAX_RETRIES
;
1113 * This indicates that the command is ready from our end to be
1118 return scsi_prep_return(q
, rq
, ret
);
1122 * sd_open - open a scsi disk device
1123 * @inode: only i_rdev member may be used
1124 * @filp: only f_mode and f_flags may be used
1126 * Returns 0 if successful. Returns a negated errno value in case
1129 * Note: This can be called from a user context (e.g. fsck(1) )
1130 * or from within the kernel (e.g. as a result of a mount(1) ).
1131 * In the latter case @inode and @filp carry an abridged amount
1132 * of information as noted above.
1134 * Locking: called with bdev->bd_mutex held.
1136 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1138 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1139 struct scsi_device
*sdev
;
1145 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1147 sdev
= sdkp
->device
;
1150 * If the device is in error recovery, wait until it is done.
1151 * If the device is offline, then disallow any access to it.
1154 if (!scsi_block_when_processing_errors(sdev
))
1157 if (sdev
->removable
|| sdkp
->write_prot
)
1158 check_disk_change(bdev
);
1161 * If the drive is empty, just let the open fail.
1163 retval
= -ENOMEDIUM
;
1164 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1168 * If the device has the write protect tab set, have the open fail
1169 * if the user expects to be able to write to the thing.
1172 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1176 * It is possible that the disk changing stuff resulted in
1177 * the device being taken offline. If this is the case,
1178 * report this to the user, and don't pretend that the
1179 * open actually succeeded.
1182 if (!scsi_device_online(sdev
))
1185 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1186 if (scsi_block_when_processing_errors(sdev
))
1187 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1193 scsi_disk_put(sdkp
);
1198 * sd_release - invoked when the (last) close(2) is called on this
1200 * @inode: only i_rdev member may be used
1201 * @filp: only f_mode and f_flags may be used
1205 * Note: may block (uninterruptible) if error recovery is underway
1208 * Locking: called with bdev->bd_mutex held.
1210 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1212 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1213 struct scsi_device
*sdev
= sdkp
->device
;
1215 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1217 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1218 if (scsi_block_when_processing_errors(sdev
))
1219 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1223 * XXX and what if there are packets in flight and this close()
1224 * XXX is followed by a "rmmod sd_mod"?
1227 scsi_disk_put(sdkp
);
1230 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1232 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1233 struct scsi_device
*sdp
= sdkp
->device
;
1234 struct Scsi_Host
*host
= sdp
->host
;
1237 /* default to most commonly used values */
1238 diskinfo
[0] = 0x40; /* 1 << 6 */
1239 diskinfo
[1] = 0x20; /* 1 << 5 */
1240 diskinfo
[2] = sdkp
->capacity
>> 11;
1242 /* override with calculated, extended default, or driver values */
1243 if (host
->hostt
->bios_param
)
1244 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1246 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1248 geo
->heads
= diskinfo
[0];
1249 geo
->sectors
= diskinfo
[1];
1250 geo
->cylinders
= diskinfo
[2];
1255 * sd_ioctl - process an ioctl
1256 * @inode: only i_rdev/i_bdev members may be used
1257 * @filp: only f_mode and f_flags may be used
1258 * @cmd: ioctl command number
1259 * @arg: this is third argument given to ioctl(2) system call.
1260 * Often contains a pointer.
1262 * Returns 0 if successful (some ioctls return positive numbers on
1263 * success as well). Returns a negated errno value in case of error.
1265 * Note: most ioctls are forward onto the block subsystem or further
1266 * down in the scsi subsystem.
1268 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1269 unsigned int cmd
, unsigned long arg
)
1271 struct gendisk
*disk
= bdev
->bd_disk
;
1272 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1273 struct scsi_device
*sdp
= sdkp
->device
;
1274 void __user
*p
= (void __user
*)arg
;
1277 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1278 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1280 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1285 * If we are in the middle of error recovery, don't let anyone
1286 * else try and use this device. Also, if error recovery fails, it
1287 * may try and take the device offline, in which case all further
1288 * access to the device is prohibited.
1290 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1291 (mode
& FMODE_NDELAY
) != 0);
1292 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1296 * Send SCSI addressing ioctls directly to mid level, send other
1297 * ioctls to block level and then onto mid level if they can't be
1301 case SCSI_IOCTL_GET_IDLUN
:
1302 case SCSI_IOCTL_GET_BUS_NUMBER
:
1303 error
= scsi_ioctl(sdp
, cmd
, p
);
1306 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1307 if (error
!= -ENOTTY
)
1309 error
= scsi_ioctl(sdp
, cmd
, p
);
1316 static void set_media_not_present(struct scsi_disk
*sdkp
)
1318 if (sdkp
->media_present
)
1319 sdkp
->device
->changed
= 1;
1321 if (sdkp
->device
->removable
) {
1322 sdkp
->media_present
= 0;
1327 static int media_not_present(struct scsi_disk
*sdkp
,
1328 struct scsi_sense_hdr
*sshdr
)
1330 if (!scsi_sense_valid(sshdr
))
1333 /* not invoked for commands that could return deferred errors */
1334 switch (sshdr
->sense_key
) {
1335 case UNIT_ATTENTION
:
1337 /* medium not present */
1338 if (sshdr
->asc
== 0x3A) {
1339 set_media_not_present(sdkp
);
1347 * sd_check_events - check media events
1348 * @disk: kernel device descriptor
1349 * @clearing: disk events currently being cleared
1351 * Returns mask of DISK_EVENT_*.
1353 * Note: this function is invoked from the block subsystem.
1355 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1357 struct scsi_disk
*sdkp
= scsi_disk_get(disk
);
1358 struct scsi_device
*sdp
;
1359 struct scsi_sense_hdr
*sshdr
= NULL
;
1366 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1369 * If the device is offline, don't send any commands - just pretend as
1370 * if the command failed. If the device ever comes back online, we
1371 * can deal with it then. It is only because of unrecoverable errors
1372 * that we would ever take a device offline in the first place.
1374 if (!scsi_device_online(sdp
)) {
1375 set_media_not_present(sdkp
);
1380 * Using TEST_UNIT_READY enables differentiation between drive with
1381 * no cartridge loaded - NOT READY, drive with changed cartridge -
1382 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1384 * Drives that auto spin down. eg iomega jaz 1G, will be started
1385 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1386 * sd_revalidate() is called.
1390 if (scsi_block_when_processing_errors(sdp
)) {
1391 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1392 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1396 /* failed to execute TUR, assume media not present */
1397 if (host_byte(retval
)) {
1398 set_media_not_present(sdkp
);
1402 if (media_not_present(sdkp
, sshdr
))
1406 * For removable scsi disk we have to recognise the presence
1407 * of a disk in the drive.
1409 if (!sdkp
->media_present
)
1411 sdkp
->media_present
= 1;
1414 * sdp->changed is set under the following conditions:
1416 * Medium present state has changed in either direction.
1417 * Device has indicated UNIT_ATTENTION.
1420 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1422 scsi_disk_put(sdkp
);
1426 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1429 struct scsi_device
*sdp
= sdkp
->device
;
1430 struct scsi_sense_hdr sshdr
;
1432 if (!scsi_device_online(sdp
))
1436 for (retries
= 3; retries
> 0; --retries
) {
1437 unsigned char cmd
[10] = { 0 };
1439 cmd
[0] = SYNCHRONIZE_CACHE
;
1441 * Leave the rest of the command zero to indicate
1444 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1445 &sshdr
, SD_FLUSH_TIMEOUT
,
1446 SD_MAX_RETRIES
, NULL
, REQ_PM
);
1452 sd_print_result(sdkp
, res
);
1453 if (driver_byte(res
) & DRIVER_SENSE
)
1454 sd_print_sense_hdr(sdkp
, &sshdr
);
1462 static void sd_rescan(struct device
*dev
)
1464 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1467 revalidate_disk(sdkp
->disk
);
1468 scsi_disk_put(sdkp
);
1473 #ifdef CONFIG_COMPAT
1475 * This gets directly called from VFS. When the ioctl
1476 * is not recognized we go back to the other translation paths.
1478 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1479 unsigned int cmd
, unsigned long arg
)
1481 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1484 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1489 * If we are in the middle of error recovery, don't let anyone
1490 * else try and use this device. Also, if error recovery fails, it
1491 * may try and take the device offline, in which case all further
1492 * access to the device is prohibited.
1494 if (!scsi_block_when_processing_errors(sdev
))
1497 if (sdev
->host
->hostt
->compat_ioctl
) {
1498 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1504 * Let the static ioctl translation table take care of it.
1506 return -ENOIOCTLCMD
;
1510 static const struct block_device_operations sd_fops
= {
1511 .owner
= THIS_MODULE
,
1513 .release
= sd_release
,
1515 .getgeo
= sd_getgeo
,
1516 #ifdef CONFIG_COMPAT
1517 .compat_ioctl
= sd_compat_ioctl
,
1519 .check_events
= sd_check_events
,
1520 .revalidate_disk
= sd_revalidate_disk
,
1521 .unlock_native_capacity
= sd_unlock_native_capacity
,
1525 * sd_eh_action - error handling callback
1526 * @scmd: sd-issued command that has failed
1527 * @eh_cmnd: The command that was sent during error handling
1528 * @eh_cmnd_len: Length of eh_cmnd in bytes
1529 * @eh_disp: The recovery disposition suggested by the midlayer
1531 * This function is called by the SCSI midlayer upon completion of
1532 * an error handling command (TEST UNIT READY, START STOP UNIT,
1533 * etc.) The command sent to the device by the error handler is
1534 * stored in eh_cmnd. The result of sending the eh command is
1535 * passed in eh_disp.
1537 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1538 int eh_cmnd_len
, int eh_disp
)
1540 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1542 if (!scsi_device_online(scmd
->device
) ||
1543 !scsi_medium_access_command(scmd
))
1547 * The device has timed out executing a medium access command.
1548 * However, the TEST UNIT READY command sent during error
1549 * handling completed successfully. Either the device is in the
1550 * process of recovering or has it suffered an internal failure
1551 * that prevents access to the storage medium.
1553 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1554 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1555 sdkp
->medium_access_timed_out
++;
1558 * If the device keeps failing read/write commands but TEST UNIT
1559 * READY always completes successfully we assume that medium
1560 * access is no longer possible and take the device offline.
1562 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1563 scmd_printk(KERN_ERR
, scmd
,
1564 "Medium access timeout failure. Offlining disk!\n");
1565 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1573 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1575 u64 start_lba
= blk_rq_pos(scmd
->request
);
1576 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1580 * resid is optional but mostly filled in. When it's unused,
1581 * its value is zero, so we assume the whole buffer transferred
1583 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1584 unsigned int good_bytes
;
1586 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1589 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1590 SCSI_SENSE_BUFFERSIZE
,
1595 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1598 if (scmd
->device
->sector_size
< 512) {
1599 /* only legitimate sector_size here is 256 */
1603 /* be careful ... don't want any overflows */
1604 u64 factor
= scmd
->device
->sector_size
/ 512;
1605 do_div(start_lba
, factor
);
1606 do_div(end_lba
, factor
);
1609 /* The bad lba was reported incorrectly, we have no idea where
1612 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1615 /* This computation should always be done in terms of
1616 * the resolution of the device's medium.
1618 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1619 return min(good_bytes
, transferred
);
1623 * sd_done - bottom half handler: called when the lower level
1624 * driver has completed (successfully or otherwise) a scsi command.
1625 * @SCpnt: mid-level's per command structure.
1627 * Note: potentially run from within an ISR. Must not block.
1629 static int sd_done(struct scsi_cmnd
*SCpnt
)
1631 int result
= SCpnt
->result
;
1632 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1633 struct scsi_sense_hdr sshdr
;
1634 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1635 struct request
*req
= SCpnt
->request
;
1636 int sense_valid
= 0;
1637 int sense_deferred
= 0;
1638 unsigned char op
= SCpnt
->cmnd
[0];
1639 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1641 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1643 good_bytes
= blk_rq_bytes(req
);
1644 scsi_set_resid(SCpnt
, 0);
1647 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1652 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1654 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1656 #ifdef CONFIG_SCSI_LOGGING
1657 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1659 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1660 "sd_done: sb[respc,sk,asc,"
1661 "ascq]=%x,%x,%x,%x\n",
1662 sshdr
.response_code
,
1663 sshdr
.sense_key
, sshdr
.asc
,
1667 if (driver_byte(result
) != DRIVER_SENSE
&&
1668 (!sense_valid
|| sense_deferred
))
1671 sdkp
->medium_access_timed_out
= 0;
1673 switch (sshdr
.sense_key
) {
1674 case HARDWARE_ERROR
:
1676 good_bytes
= sd_completed_bytes(SCpnt
);
1678 case RECOVERED_ERROR
:
1679 good_bytes
= scsi_bufflen(SCpnt
);
1682 /* This indicates a false check condition, so ignore it. An
1683 * unknown amount of data was transferred so treat it as an
1686 scsi_print_sense("sd", SCpnt
);
1688 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1690 case ABORTED_COMMAND
:
1691 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1692 good_bytes
= sd_completed_bytes(SCpnt
);
1694 case ILLEGAL_REQUEST
:
1695 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1696 good_bytes
= sd_completed_bytes(SCpnt
);
1697 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1698 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1701 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1706 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1708 sdkp
->device
->no_write_same
= 1;
1709 sd_config_write_same(sdkp
);
1712 req
->__data_len
= blk_rq_bytes(req
);
1713 req
->cmd_flags
|= REQ_QUIET
;
1722 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1723 sd_dif_complete(SCpnt
, good_bytes
);
1729 * spinup disk - called only in sd_revalidate_disk()
1732 sd_spinup_disk(struct scsi_disk
*sdkp
)
1734 unsigned char cmd
[10];
1735 unsigned long spintime_expire
= 0;
1736 int retries
, spintime
;
1737 unsigned int the_result
;
1738 struct scsi_sense_hdr sshdr
;
1739 int sense_valid
= 0;
1743 /* Spin up drives, as required. Only do this at boot time */
1744 /* Spinup needs to be done for module loads too. */
1749 cmd
[0] = TEST_UNIT_READY
;
1750 memset((void *) &cmd
[1], 0, 9);
1752 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1755 SD_MAX_RETRIES
, NULL
);
1758 * If the drive has indicated to us that it
1759 * doesn't have any media in it, don't bother
1760 * with any more polling.
1762 if (media_not_present(sdkp
, &sshdr
))
1766 sense_valid
= scsi_sense_valid(&sshdr
);
1768 } while (retries
< 3 &&
1769 (!scsi_status_is_good(the_result
) ||
1770 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1771 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1773 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1774 /* no sense, TUR either succeeded or failed
1775 * with a status error */
1776 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1777 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1778 sd_print_result(sdkp
, the_result
);
1784 * The device does not want the automatic start to be issued.
1786 if (sdkp
->device
->no_start_on_add
)
1789 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1790 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1791 break; /* manual intervention required */
1792 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1793 break; /* standby */
1794 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1795 break; /* unavailable */
1797 * Issue command to spin up drive when not ready
1800 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1801 cmd
[0] = START_STOP
;
1802 cmd
[1] = 1; /* Return immediately */
1803 memset((void *) &cmd
[2], 0, 8);
1804 cmd
[4] = 1; /* Start spin cycle */
1805 if (sdkp
->device
->start_stop_pwr_cond
)
1807 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1809 SD_TIMEOUT
, SD_MAX_RETRIES
,
1811 spintime_expire
= jiffies
+ 100 * HZ
;
1814 /* Wait 1 second for next try */
1819 * Wait for USB flash devices with slow firmware.
1820 * Yes, this sense key/ASC combination shouldn't
1821 * occur here. It's characteristic of these devices.
1823 } else if (sense_valid
&&
1824 sshdr
.sense_key
== UNIT_ATTENTION
&&
1825 sshdr
.asc
== 0x28) {
1827 spintime_expire
= jiffies
+ 5 * HZ
;
1830 /* Wait 1 second for next try */
1833 /* we don't understand the sense code, so it's
1834 * probably pointless to loop */
1836 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1837 sd_print_sense_hdr(sdkp
, &sshdr
);
1842 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1845 if (scsi_status_is_good(the_result
))
1848 printk("not responding...\n");
1854 * Determine whether disk supports Data Integrity Field.
1856 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1858 struct scsi_device
*sdp
= sdkp
->device
;
1862 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1865 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1867 if (type
> SD_DIF_TYPE3_PROTECTION
)
1869 else if (scsi_host_dif_capable(sdp
->host
, type
))
1872 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1875 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1876 " protection type %u. Disabling disk!\n",
1880 sd_printk(KERN_NOTICE
, sdkp
,
1881 "Enabling DIF Type %u protection\n", type
);
1884 sd_printk(KERN_NOTICE
, sdkp
,
1885 "Disabling DIF Type %u protection\n", type
);
1889 sdkp
->protection_type
= type
;
1894 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1895 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1898 sd_print_result(sdkp
, the_result
);
1899 if (driver_byte(the_result
) & DRIVER_SENSE
)
1900 sd_print_sense_hdr(sdkp
, sshdr
);
1902 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1905 * Set dirty bit for removable devices if not ready -
1906 * sometimes drives will not report this properly.
1908 if (sdp
->removable
&&
1909 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1910 set_media_not_present(sdkp
);
1913 * We used to set media_present to 0 here to indicate no media
1914 * in the drive, but some drives fail read capacity even with
1915 * media present, so we can't do that.
1917 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1921 #if RC16_LEN > SD_BUF_SIZE
1922 #error RC16_LEN must not be more than SD_BUF_SIZE
1925 #define READ_CAPACITY_RETRIES_ON_RESET 10
1928 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
1929 * and the reported logical block size is bigger than 512 bytes. Note
1930 * that last_sector is a u64 and therefore logical_to_sectors() is not
1933 static bool sd_addressable_capacity(u64 lba
, unsigned int sector_size
)
1935 u64 last_sector
= (lba
+ 1ULL) << (ilog2(sector_size
) - 9);
1937 if (sizeof(sector_t
) == 4 && last_sector
> U32_MAX
)
1943 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1944 unsigned char *buffer
)
1946 unsigned char cmd
[16];
1947 struct scsi_sense_hdr sshdr
;
1948 int sense_valid
= 0;
1950 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1951 unsigned int alignment
;
1952 unsigned long long lba
;
1953 unsigned sector_size
;
1955 if (sdp
->no_read_capacity_16
)
1960 cmd
[0] = SERVICE_ACTION_IN
;
1961 cmd
[1] = SAI_READ_CAPACITY_16
;
1963 memset(buffer
, 0, RC16_LEN
);
1965 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1966 buffer
, RC16_LEN
, &sshdr
,
1967 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1969 if (media_not_present(sdkp
, &sshdr
))
1973 sense_valid
= scsi_sense_valid(&sshdr
);
1975 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1976 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1978 /* Invalid Command Operation Code or
1979 * Invalid Field in CDB, just retry
1980 * silently with RC10 */
1983 sshdr
.sense_key
== UNIT_ATTENTION
&&
1984 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1985 /* Device reset might occur several times,
1986 * give it one more chance */
1987 if (--reset_retries
> 0)
1992 } while (the_result
&& retries
);
1995 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1996 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2000 sector_size
= get_unaligned_be32(&buffer
[8]);
2001 lba
= get_unaligned_be64(&buffer
[0]);
2003 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
2008 if (!sd_addressable_capacity(lba
, sector_size
)) {
2009 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2010 "kernel compiled with support for large block "
2016 /* Logical blocks per physical block exponent */
2017 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2019 /* Lowest aligned logical block */
2020 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2021 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2022 if (alignment
&& sdkp
->first_scan
)
2023 sd_printk(KERN_NOTICE
, sdkp
,
2024 "physical block alignment offset: %u\n", alignment
);
2026 if (buffer
[14] & 0x80) { /* LBPME */
2029 if (buffer
[14] & 0x40) /* LBPRZ */
2032 sd_config_discard(sdkp
, SD_LBP_WS16
);
2035 sdkp
->capacity
= lba
+ 1;
2039 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2040 unsigned char *buffer
)
2042 unsigned char cmd
[16];
2043 struct scsi_sense_hdr sshdr
;
2044 int sense_valid
= 0;
2046 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2048 unsigned sector_size
;
2051 cmd
[0] = READ_CAPACITY
;
2052 memset(&cmd
[1], 0, 9);
2053 memset(buffer
, 0, 8);
2055 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2057 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2059 if (media_not_present(sdkp
, &sshdr
))
2063 sense_valid
= scsi_sense_valid(&sshdr
);
2065 sshdr
.sense_key
== UNIT_ATTENTION
&&
2066 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2067 /* Device reset might occur several times,
2068 * give it one more chance */
2069 if (--reset_retries
> 0)
2074 } while (the_result
&& retries
);
2077 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
2078 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2082 sector_size
= get_unaligned_be32(&buffer
[4]);
2083 lba
= get_unaligned_be32(&buffer
[0]);
2085 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2086 /* Some buggy (usb cardreader) devices return an lba of
2087 0xffffffff when the want to report a size of 0 (with
2088 which they really mean no media is present) */
2090 sdkp
->physical_block_size
= sector_size
;
2094 if (!sd_addressable_capacity(lba
, sector_size
)) {
2095 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2096 "kernel compiled with support for large block "
2102 sdkp
->capacity
= lba
+ 1;
2103 sdkp
->physical_block_size
= sector_size
;
2107 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2109 if (sdp
->host
->max_cmd_len
< 16)
2111 if (sdp
->try_rc_10_first
)
2113 if (sdp
->scsi_level
> SCSI_SPC_2
)
2115 if (scsi_device_protection(sdp
))
2121 * read disk capacity
2124 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2127 struct scsi_device
*sdp
= sdkp
->device
;
2128 sector_t old_capacity
= sdkp
->capacity
;
2130 if (sd_try_rc16_first(sdp
)) {
2131 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2132 if (sector_size
== -EOVERFLOW
)
2134 if (sector_size
== -ENODEV
)
2136 if (sector_size
< 0)
2137 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2138 if (sector_size
< 0)
2141 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2142 if (sector_size
== -EOVERFLOW
)
2144 if (sector_size
< 0)
2146 if ((sizeof(sdkp
->capacity
) > 4) &&
2147 (sdkp
->capacity
> 0xffffffffULL
)) {
2148 int old_sector_size
= sector_size
;
2149 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2150 "Trying to use READ CAPACITY(16).\n");
2151 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2152 if (sector_size
< 0) {
2153 sd_printk(KERN_NOTICE
, sdkp
,
2154 "Using 0xffffffff as device size\n");
2155 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2156 sector_size
= old_sector_size
;
2162 /* Some devices are known to return the total number of blocks,
2163 * not the highest block number. Some devices have versions
2164 * which do this and others which do not. Some devices we might
2165 * suspect of doing this but we don't know for certain.
2167 * If we know the reported capacity is wrong, decrement it. If
2168 * we can only guess, then assume the number of blocks is even
2169 * (usually true but not always) and err on the side of lowering
2172 if (sdp
->fix_capacity
||
2173 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2174 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2175 "from its reported value: %llu\n",
2176 (unsigned long long) sdkp
->capacity
);
2181 if (sector_size
== 0) {
2183 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2187 if (sector_size
!= 512 &&
2188 sector_size
!= 1024 &&
2189 sector_size
!= 2048 &&
2190 sector_size
!= 4096 &&
2191 sector_size
!= 256) {
2192 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2195 * The user might want to re-format the drive with
2196 * a supported sectorsize. Once this happens, it
2197 * would be relatively trivial to set the thing up.
2198 * For this reason, we leave the thing in the table.
2202 * set a bogus sector size so the normal read/write
2203 * logic in the block layer will eventually refuse any
2204 * request on this device without tripping over power
2205 * of two sector size assumptions
2209 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2212 char cap_str_2
[10], cap_str_10
[10];
2213 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2215 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2217 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2218 sizeof(cap_str_10
));
2220 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2221 sd_printk(KERN_NOTICE
, sdkp
,
2222 "%llu %d-byte logical blocks: (%s/%s)\n",
2223 (unsigned long long)sdkp
->capacity
,
2224 sector_size
, cap_str_10
, cap_str_2
);
2226 if (sdkp
->physical_block_size
!= sector_size
)
2227 sd_printk(KERN_NOTICE
, sdkp
,
2228 "%u-byte physical blocks\n",
2229 sdkp
->physical_block_size
);
2233 sdp
->use_16_for_rw
= (sdkp
->capacity
> 0xffffffff);
2235 /* Rescale capacity to 512-byte units */
2236 if (sector_size
== 4096)
2237 sdkp
->capacity
<<= 3;
2238 else if (sector_size
== 2048)
2239 sdkp
->capacity
<<= 2;
2240 else if (sector_size
== 1024)
2241 sdkp
->capacity
<<= 1;
2242 else if (sector_size
== 256)
2243 sdkp
->capacity
>>= 1;
2245 blk_queue_physical_block_size(sdp
->request_queue
,
2246 sdkp
->physical_block_size
);
2247 sdkp
->device
->sector_size
= sector_size
;
2250 /* called with buffer of length 512 */
2252 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2253 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2254 struct scsi_sense_hdr
*sshdr
)
2256 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2257 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2262 * read write protect setting, if possible - called only in sd_revalidate_disk()
2263 * called with buffer of length SD_BUF_SIZE
2266 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2269 struct scsi_device
*sdp
= sdkp
->device
;
2270 struct scsi_mode_data data
;
2271 int old_wp
= sdkp
->write_prot
;
2273 set_disk_ro(sdkp
->disk
, 0);
2274 if (sdp
->skip_ms_page_3f
) {
2275 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2279 if (sdp
->use_192_bytes_for_3f
) {
2280 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2283 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2284 * We have to start carefully: some devices hang if we ask
2285 * for more than is available.
2287 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2290 * Second attempt: ask for page 0 When only page 0 is
2291 * implemented, a request for page 3F may return Sense Key
2292 * 5: Illegal Request, Sense Code 24: Invalid field in
2295 if (!scsi_status_is_good(res
))
2296 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2299 * Third attempt: ask 255 bytes, as we did earlier.
2301 if (!scsi_status_is_good(res
))
2302 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2306 if (!scsi_status_is_good(res
)) {
2307 sd_printk(KERN_WARNING
, sdkp
,
2308 "Test WP failed, assume Write Enabled\n");
2310 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2311 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2312 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2313 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2314 sdkp
->write_prot
? "on" : "off");
2315 sd_printk(KERN_DEBUG
, sdkp
,
2316 "Mode Sense: %02x %02x %02x %02x\n",
2317 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2323 * sd_read_cache_type - called only from sd_revalidate_disk()
2324 * called with buffer of length SD_BUF_SIZE
2327 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2330 struct scsi_device
*sdp
= sdkp
->device
;
2335 struct scsi_mode_data data
;
2336 struct scsi_sense_hdr sshdr
;
2337 int old_wce
= sdkp
->WCE
;
2338 int old_rcd
= sdkp
->RCD
;
2339 int old_dpofua
= sdkp
->DPOFUA
;
2342 if (sdkp
->cache_override
)
2346 if (sdp
->skip_ms_page_8
) {
2347 if (sdp
->type
== TYPE_RBC
)
2350 if (sdp
->skip_ms_page_3f
)
2353 if (sdp
->use_192_bytes_for_3f
)
2357 } else if (sdp
->type
== TYPE_RBC
) {
2365 /* cautiously ask */
2366 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2369 if (!scsi_status_is_good(res
))
2372 if (!data
.header_length
) {
2375 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2378 /* that went OK, now ask for the proper length */
2382 * We're only interested in the first three bytes, actually.
2383 * But the data cache page is defined for the first 20.
2387 else if (len
> SD_BUF_SIZE
) {
2388 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2389 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2392 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2396 if (len
> first_len
)
2397 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2400 if (scsi_status_is_good(res
)) {
2401 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2403 while (offset
< len
) {
2404 u8 page_code
= buffer
[offset
] & 0x3F;
2405 u8 spf
= buffer
[offset
] & 0x40;
2407 if (page_code
== 8 || page_code
== 6) {
2408 /* We're interested only in the first 3 bytes.
2410 if (len
- offset
<= 2) {
2411 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2412 "mode parameter data\n");
2415 modepage
= page_code
;
2419 /* Go to the next page */
2420 if (spf
&& len
- offset
> 3)
2421 offset
+= 4 + (buffer
[offset
+2] << 8) +
2423 else if (!spf
&& len
- offset
> 1)
2424 offset
+= 2 + buffer
[offset
+1];
2426 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2427 "mode parameter data\n");
2433 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2437 if (modepage
== 8) {
2438 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2439 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2441 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2445 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2446 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2447 sd_printk(KERN_NOTICE
, sdkp
,
2448 "Uses READ/WRITE(6), disabling FUA\n");
2452 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2453 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2454 sd_printk(KERN_NOTICE
, sdkp
,
2455 "Write cache: %s, read cache: %s, %s\n",
2456 sdkp
->WCE
? "enabled" : "disabled",
2457 sdkp
->RCD
? "disabled" : "enabled",
2458 sdkp
->DPOFUA
? "supports DPO and FUA"
2459 : "doesn't support DPO or FUA");
2465 if (scsi_sense_valid(&sshdr
) &&
2466 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2467 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2468 /* Invalid field in CDB */
2469 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2471 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2474 if (sdp
->wce_default_on
) {
2475 sd_printk(KERN_NOTICE
, sdkp
, "Assuming drive cache: write back\n");
2478 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2486 * The ATO bit indicates whether the DIF application tag is available
2487 * for use by the operating system.
2489 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2492 struct scsi_device
*sdp
= sdkp
->device
;
2493 struct scsi_mode_data data
;
2494 struct scsi_sense_hdr sshdr
;
2496 if (sdp
->type
!= TYPE_DISK
)
2499 if (sdkp
->protection_type
== 0)
2502 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2503 SD_MAX_RETRIES
, &data
, &sshdr
);
2505 if (!scsi_status_is_good(res
) || !data
.header_length
||
2507 sd_printk(KERN_WARNING
, sdkp
,
2508 "getting Control mode page failed, assume no ATO\n");
2510 if (scsi_sense_valid(&sshdr
))
2511 sd_print_sense_hdr(sdkp
, &sshdr
);
2516 offset
= data
.header_length
+ data
.block_descriptor_length
;
2518 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2519 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2523 if ((buffer
[offset
+ 5] & 0x80) == 0)
2532 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2533 * @disk: disk to query
2535 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2537 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2538 const int vpd_len
= 64;
2539 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2542 /* Block Limits VPD */
2543 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2546 blk_queue_io_min(sdkp
->disk
->queue
,
2547 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2548 blk_queue_io_opt(sdkp
->disk
->queue
,
2549 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2551 if (buffer
[3] == 0x3c) {
2552 unsigned int lba_count
, desc_count
;
2554 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2559 lba_count
= get_unaligned_be32(&buffer
[20]);
2560 desc_count
= get_unaligned_be32(&buffer
[24]);
2562 if (lba_count
&& desc_count
)
2563 sdkp
->max_unmap_blocks
= lba_count
;
2565 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2567 if (buffer
[32] & 0x80)
2568 sdkp
->unmap_alignment
=
2569 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2571 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2573 if (sdkp
->max_unmap_blocks
)
2574 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2576 sd_config_discard(sdkp
, SD_LBP_WS16
);
2578 } else { /* LBP VPD page tells us what to use */
2580 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2581 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2582 else if (sdkp
->lbpws
)
2583 sd_config_discard(sdkp
, SD_LBP_WS16
);
2584 else if (sdkp
->lbpws10
)
2585 sd_config_discard(sdkp
, SD_LBP_WS10
);
2587 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2596 * sd_read_block_characteristics - Query block dev. characteristics
2597 * @disk: disk to query
2599 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2601 unsigned char *buffer
;
2603 const int vpd_len
= 64;
2605 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2608 /* Block Device Characteristics VPD */
2609 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2612 rot
= get_unaligned_be16(&buffer
[4]);
2615 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2622 * sd_read_block_provisioning - Query provisioning VPD page
2623 * @disk: disk to query
2625 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2627 unsigned char *buffer
;
2628 const int vpd_len
= 8;
2630 if (sdkp
->lbpme
== 0)
2633 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2635 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2639 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2640 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2641 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2647 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2649 struct scsi_device
*sdev
= sdkp
->device
;
2651 if (sdev
->host
->no_write_same
) {
2652 sdev
->no_write_same
= 1;
2657 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2658 /* too large values might cause issues with arcmsr */
2659 int vpd_buf_len
= 64;
2661 sdev
->no_report_opcodes
= 1;
2663 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2664 * CODES is unsupported and the device has an ATA
2665 * Information VPD page (SAT).
2667 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2668 sdev
->no_write_same
= 1;
2671 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2674 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2678 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2681 * Although VPD inquiries can go to SCSI-2 type devices,
2682 * some USB ones crash on receiving them, and the pages
2683 * we currently ask for are for SPC-3 and beyond
2685 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2691 * sd_revalidate_disk - called the first time a new disk is seen,
2692 * performs disk spin up, read_capacity, etc.
2693 * @disk: struct gendisk we care about
2695 static int sd_revalidate_disk(struct gendisk
*disk
)
2697 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2698 struct scsi_device
*sdp
= sdkp
->device
;
2699 unsigned char *buffer
;
2702 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2703 "sd_revalidate_disk\n"));
2706 * If the device is offline, don't try and read capacity or any
2707 * of the other niceties.
2709 if (!scsi_device_online(sdp
))
2712 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2714 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2715 "allocation failure.\n");
2719 sd_spinup_disk(sdkp
);
2722 * Without media there is no reason to ask; moreover, some devices
2723 * react badly if we do.
2725 if (sdkp
->media_present
) {
2726 sd_read_capacity(sdkp
, buffer
);
2728 if (sd_try_extended_inquiry(sdp
)) {
2729 sd_read_block_provisioning(sdkp
);
2730 sd_read_block_limits(sdkp
);
2731 sd_read_block_characteristics(sdkp
);
2734 sd_read_write_protect_flag(sdkp
, buffer
);
2735 sd_read_cache_type(sdkp
, buffer
);
2736 sd_read_app_tag_own(sdkp
, buffer
);
2737 sd_read_write_same(sdkp
, buffer
);
2740 sdkp
->first_scan
= 0;
2743 * We now have all cache related info, determine how we deal
2744 * with flush requests.
2752 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2754 set_capacity(disk
, sdkp
->capacity
);
2755 sd_config_write_same(sdkp
);
2763 * sd_unlock_native_capacity - unlock native capacity
2764 * @disk: struct gendisk to set capacity for
2766 * Block layer calls this function if it detects that partitions
2767 * on @disk reach beyond the end of the device. If the SCSI host
2768 * implements ->unlock_native_capacity() method, it's invoked to
2769 * give it a chance to adjust the device capacity.
2772 * Defined by block layer. Might sleep.
2774 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2776 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2778 if (sdev
->host
->hostt
->unlock_native_capacity
)
2779 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2783 * sd_format_disk_name - format disk name
2784 * @prefix: name prefix - ie. "sd" for SCSI disks
2785 * @index: index of the disk to format name for
2786 * @buf: output buffer
2787 * @buflen: length of the output buffer
2789 * SCSI disk names starts at sda. The 26th device is sdz and the
2790 * 27th is sdaa. The last one for two lettered suffix is sdzz
2791 * which is followed by sdaaa.
2793 * This is basically 26 base counting with one extra 'nil' entry
2794 * at the beginning from the second digit on and can be
2795 * determined using similar method as 26 base conversion with the
2796 * index shifted -1 after each digit is computed.
2802 * 0 on success, -errno on failure.
2804 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2806 const int base
= 'z' - 'a' + 1;
2807 char *begin
= buf
+ strlen(prefix
);
2808 char *end
= buf
+ buflen
;
2818 *--p
= 'a' + (index
% unit
);
2819 index
= (index
/ unit
) - 1;
2820 } while (index
>= 0);
2822 memmove(begin
, p
, end
- p
);
2823 memcpy(buf
, prefix
, strlen(prefix
));
2829 * The asynchronous part of sd_probe
2831 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2833 struct scsi_disk
*sdkp
= data
;
2834 struct scsi_device
*sdp
;
2841 index
= sdkp
->index
;
2842 dev
= &sdp
->sdev_gendev
;
2844 gd
->major
= sd_major((index
& 0xf0) >> 4);
2845 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2846 gd
->minors
= SD_MINORS
;
2848 gd
->fops
= &sd_fops
;
2849 gd
->private_data
= &sdkp
->driver
;
2850 gd
->queue
= sdkp
->device
->request_queue
;
2852 /* defaults, until the device tells us otherwise */
2853 sdp
->sector_size
= 512;
2855 sdkp
->media_present
= 1;
2856 sdkp
->write_prot
= 0;
2857 sdkp
->cache_override
= 0;
2861 sdkp
->first_scan
= 1;
2862 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2864 sd_revalidate_disk(gd
);
2866 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2867 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2869 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2870 gd
->flags
= GENHD_FL_EXT_DEVT
;
2871 if (sdp
->removable
) {
2872 gd
->flags
|= GENHD_FL_REMOVABLE
;
2873 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2876 blk_pm_runtime_init(sdp
->request_queue
, dev
);
2879 sd_dif_config_host(sdkp
);
2881 sd_revalidate_disk(gd
);
2883 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2884 sdp
->removable
? "removable " : "");
2885 scsi_autopm_put_device(sdp
);
2886 put_device(&sdkp
->dev
);
2890 * sd_probe - called during driver initialization and whenever a
2891 * new scsi device is attached to the system. It is called once
2892 * for each scsi device (not just disks) present.
2893 * @dev: pointer to device object
2895 * Returns 0 if successful (or not interested in this scsi device
2896 * (e.g. scanner)); 1 when there is an error.
2898 * Note: this function is invoked from the scsi mid-level.
2899 * This function sets up the mapping between a given
2900 * <host,channel,id,lun> (found in sdp) and new device name
2901 * (e.g. /dev/sda). More precisely it is the block device major
2902 * and minor number that is chosen here.
2904 * Assume sd_probe is not re-entrant (for time being)
2905 * Also think about sd_probe() and sd_remove() running coincidentally.
2907 static int sd_probe(struct device
*dev
)
2909 struct scsi_device
*sdp
= to_scsi_device(dev
);
2910 struct scsi_disk
*sdkp
;
2916 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2919 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2923 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2927 gd
= alloc_disk(SD_MINORS
);
2932 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2935 spin_lock(&sd_index_lock
);
2936 error
= ida_get_new(&sd_index_ida
, &index
);
2937 spin_unlock(&sd_index_lock
);
2938 } while (error
== -EAGAIN
);
2941 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2945 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2947 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2948 goto out_free_index
;
2952 sdkp
->driver
= &sd_template
;
2954 sdkp
->index
= index
;
2955 atomic_set(&sdkp
->openers
, 0);
2956 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2958 if (!sdp
->request_queue
->rq_timeout
) {
2959 if (sdp
->type
!= TYPE_MOD
)
2960 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2962 blk_queue_rq_timeout(sdp
->request_queue
,
2966 device_initialize(&sdkp
->dev
);
2967 sdkp
->dev
.parent
= dev
;
2968 sdkp
->dev
.class = &sd_disk_class
;
2969 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2971 if (device_add(&sdkp
->dev
))
2972 goto out_free_index
;
2975 dev_set_drvdata(dev
, sdkp
);
2977 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2978 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2983 spin_lock(&sd_index_lock
);
2984 ida_remove(&sd_index_ida
, index
);
2985 spin_unlock(&sd_index_lock
);
2995 * sd_remove - called whenever a scsi disk (previously recognized by
2996 * sd_probe) is detached from the system. It is called (potentially
2997 * multiple times) during sd module unload.
2998 * @sdp: pointer to mid level scsi device object
3000 * Note: this function is invoked from the scsi mid-level.
3001 * This function potentially frees up a device name (e.g. /dev/sdc)
3002 * that could be re-used by a subsequent sd_probe().
3003 * This function is not called when the built-in sd driver is "exit-ed".
3005 static int sd_remove(struct device
*dev
)
3007 struct scsi_disk
*sdkp
;
3009 sdkp
= dev_get_drvdata(dev
);
3010 scsi_autopm_get_device(sdkp
->device
);
3012 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3013 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
3014 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
3015 device_del(&sdkp
->dev
);
3016 del_gendisk(sdkp
->disk
);
3019 mutex_lock(&sd_ref_mutex
);
3020 dev_set_drvdata(dev
, NULL
);
3021 put_device(&sdkp
->dev
);
3022 mutex_unlock(&sd_ref_mutex
);
3028 * scsi_disk_release - Called to free the scsi_disk structure
3029 * @dev: pointer to embedded class device
3031 * sd_ref_mutex must be held entering this routine. Because it is
3032 * called on last put, you should always use the scsi_disk_get()
3033 * scsi_disk_put() helpers which manipulate the semaphore directly
3034 * and never do a direct put_device.
3036 static void scsi_disk_release(struct device
*dev
)
3038 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3039 struct gendisk
*disk
= sdkp
->disk
;
3041 spin_lock(&sd_index_lock
);
3042 ida_remove(&sd_index_ida
, sdkp
->index
);
3043 spin_unlock(&sd_index_lock
);
3045 disk
->private_data
= NULL
;
3047 put_device(&sdkp
->device
->sdev_gendev
);
3052 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3054 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3055 struct scsi_sense_hdr sshdr
;
3056 struct scsi_device
*sdp
= sdkp
->device
;
3060 cmd
[4] |= 1; /* START */
3062 if (sdp
->start_stop_pwr_cond
)
3063 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3065 if (!scsi_device_online(sdp
))
3068 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3069 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, REQ_PM
);
3071 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
3072 sd_print_result(sdkp
, res
);
3073 if (driver_byte(res
) & DRIVER_SENSE
)
3074 sd_print_sense_hdr(sdkp
, &sshdr
);
3081 * Send a SYNCHRONIZE CACHE instruction down to the device through
3082 * the normal SCSI command structure. Wait for the command to
3085 static void sd_shutdown(struct device
*dev
)
3087 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3090 return; /* this can happen */
3092 if (pm_runtime_suspended(dev
))
3096 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3097 sd_sync_cache(sdkp
);
3100 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3101 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3102 sd_start_stop_device(sdkp
, 0);
3106 scsi_disk_put(sdkp
);
3109 static int sd_suspend(struct device
*dev
)
3111 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3114 if (!sdkp
) /* E.g.: runtime suspend following sd_remove() */
3118 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3119 ret
= sd_sync_cache(sdkp
);
3124 if (sdkp
->device
->manage_start_stop
) {
3125 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3126 ret
= sd_start_stop_device(sdkp
, 0);
3130 scsi_disk_put(sdkp
);
3134 static int sd_resume(struct device
*dev
)
3136 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3139 if (!sdkp
) /* E.g.: runtime resume at the start of sd_probe() */
3142 if (!sdkp
->device
->manage_start_stop
)
3145 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3146 ret
= sd_start_stop_device(sdkp
, 1);
3149 scsi_disk_put(sdkp
);
3154 * init_sd - entry point for this driver (both when built in or when
3157 * Note: this function registers this driver with the scsi mid-level.
3159 static int __init
init_sd(void)
3161 int majors
= 0, i
, err
;
3163 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3165 for (i
= 0; i
< SD_MAJORS
; i
++)
3166 if (register_blkdev(sd_major(i
), "sd") == 0)
3172 err
= class_register(&sd_disk_class
);
3176 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3178 if (!sd_cdb_cache
) {
3179 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3183 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3185 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3189 err
= scsi_register_driver(&sd_template
.gendrv
);
3191 goto err_out_driver
;
3196 mempool_destroy(sd_cdb_pool
);
3199 kmem_cache_destroy(sd_cdb_cache
);
3202 class_unregister(&sd_disk_class
);
3204 for (i
= 0; i
< SD_MAJORS
; i
++)
3205 unregister_blkdev(sd_major(i
), "sd");
3210 * exit_sd - exit point for this driver (when it is a module).
3212 * Note: this function unregisters this driver from the scsi mid-level.
3214 static void __exit
exit_sd(void)
3218 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3220 scsi_unregister_driver(&sd_template
.gendrv
);
3221 mempool_destroy(sd_cdb_pool
);
3222 kmem_cache_destroy(sd_cdb_cache
);
3224 class_unregister(&sd_disk_class
);
3226 for (i
= 0; i
< SD_MAJORS
; i
++)
3227 unregister_blkdev(sd_major(i
), "sd");
3230 module_init(init_sd
);
3231 module_exit(exit_sd
);
3233 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3234 struct scsi_sense_hdr
*sshdr
)
3236 sd_printk(KERN_INFO
, sdkp
, " ");
3237 scsi_show_sense_hdr(sshdr
);
3238 sd_printk(KERN_INFO
, sdkp
, " ");
3239 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3242 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3244 sd_printk(KERN_INFO
, sdkp
, " ");
3245 scsi_show_result(result
);