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
;
147 if (sdp
->type
!= TYPE_DISK
)
148 /* no cache control on RBC devices; theoretically they
149 * can do it, but there's probably so many exceptions
150 * it's not worth the risk */
153 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
154 len
= strlen(sd_cache_types
[i
]);
155 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
163 rcd
= ct
& 0x01 ? 1 : 0;
164 wce
= ct
& 0x02 ? 1 : 0;
165 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
166 SD_MAX_RETRIES
, &data
, NULL
))
168 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
169 data
.block_descriptor_length
);
170 buffer_data
= buffer
+ data
.header_length
+
171 data
.block_descriptor_length
;
172 buffer_data
[2] &= ~0x05;
173 buffer_data
[2] |= wce
<< 2 | rcd
;
174 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
176 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
177 SD_MAX_RETRIES
, &data
, &sshdr
)) {
178 if (scsi_sense_valid(&sshdr
))
179 sd_print_sense_hdr(sdkp
, &sshdr
);
182 revalidate_disk(sdkp
->disk
);
187 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
188 const char *buf
, size_t count
)
190 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
191 struct scsi_device
*sdp
= sdkp
->device
;
193 if (!capable(CAP_SYS_ADMIN
))
196 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
202 sd_store_allow_restart(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 if (sdp
->type
!= TYPE_DISK
)
214 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
220 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
223 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
224 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
226 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
230 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
232 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
234 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
238 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
241 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
242 struct scsi_device
*sdp
= sdkp
->device
;
244 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
248 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
251 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
253 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
257 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
260 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
262 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
266 sd_store_protection_type(struct device
*dev
, struct device_attribute
*attr
,
267 const char *buf
, size_t count
)
269 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
273 if (!capable(CAP_SYS_ADMIN
))
276 err
= kstrtouint(buf
, 10, &val
);
281 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
282 sdkp
->protection_type
= val
;
288 sd_show_protection_mode(struct device
*dev
, struct device_attribute
*attr
,
291 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
292 struct scsi_device
*sdp
= sdkp
->device
;
293 unsigned int dif
, dix
;
295 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
296 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
298 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
304 return snprintf(buf
, 20, "none\n");
306 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
310 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
313 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
315 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
319 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
322 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
324 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
327 static const char *lbp_mode
[] = {
328 [SD_LBP_FULL
] = "full",
329 [SD_LBP_UNMAP
] = "unmap",
330 [SD_LBP_WS16
] = "writesame_16",
331 [SD_LBP_WS10
] = "writesame_10",
332 [SD_LBP_ZERO
] = "writesame_zero",
333 [SD_LBP_DISABLE
] = "disabled",
337 sd_show_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
340 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
342 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
346 sd_store_provisioning_mode(struct device
*dev
, struct device_attribute
*attr
,
347 const char *buf
, size_t count
)
349 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
350 struct scsi_device
*sdp
= sdkp
->device
;
352 if (!capable(CAP_SYS_ADMIN
))
355 if (sdp
->type
!= TYPE_DISK
)
358 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
359 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
360 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
361 sd_config_discard(sdkp
, SD_LBP_WS16
);
362 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
363 sd_config_discard(sdkp
, SD_LBP_WS10
);
364 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
365 sd_config_discard(sdkp
, SD_LBP_ZERO
);
366 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
367 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
375 sd_show_max_medium_access_timeouts(struct device
*dev
,
376 struct device_attribute
*attr
, char *buf
)
378 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
380 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
384 sd_store_max_medium_access_timeouts(struct device
*dev
,
385 struct device_attribute
*attr
,
386 const char *buf
, size_t count
)
388 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
391 if (!capable(CAP_SYS_ADMIN
))
394 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
396 return err
? err
: count
;
400 sd_show_write_same_blocks(struct device
*dev
, struct device_attribute
*attr
,
403 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
405 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
409 sd_store_write_same_blocks(struct device
*dev
, struct device_attribute
*attr
,
410 const char *buf
, size_t count
)
412 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
413 struct scsi_device
*sdp
= sdkp
->device
;
417 if (!capable(CAP_SYS_ADMIN
))
420 if (sdp
->type
!= TYPE_DISK
)
423 err
= kstrtoul(buf
, 10, &max
);
429 sdp
->no_write_same
= 1;
430 else if (max
<= SD_MAX_WS16_BLOCKS
)
431 sdkp
->max_ws_blocks
= max
;
433 sd_config_write_same(sdkp
);
438 static struct device_attribute sd_disk_attrs
[] = {
439 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
440 sd_store_cache_type
),
441 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
442 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
443 sd_store_allow_restart
),
444 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
445 sd_store_manage_start_stop
),
446 __ATTR(protection_type
, S_IRUGO
|S_IWUSR
, sd_show_protection_type
,
447 sd_store_protection_type
),
448 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
449 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
450 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
451 __ATTR(provisioning_mode
, S_IRUGO
|S_IWUSR
, sd_show_provisioning_mode
,
452 sd_store_provisioning_mode
),
453 __ATTR(max_write_same_blocks
, S_IRUGO
|S_IWUSR
,
454 sd_show_write_same_blocks
, sd_store_write_same_blocks
),
455 __ATTR(max_medium_access_timeouts
, S_IRUGO
|S_IWUSR
,
456 sd_show_max_medium_access_timeouts
,
457 sd_store_max_medium_access_timeouts
),
461 static struct class sd_disk_class
= {
463 .owner
= THIS_MODULE
,
464 .dev_release
= scsi_disk_release
,
465 .dev_attrs
= sd_disk_attrs
,
468 static const struct dev_pm_ops sd_pm_ops
= {
469 .suspend
= sd_suspend
,
471 .poweroff
= sd_suspend
,
472 .restore
= sd_resume
,
473 .runtime_suspend
= sd_suspend
,
474 .runtime_resume
= sd_resume
,
477 static struct scsi_driver sd_template
= {
478 .owner
= THIS_MODULE
,
483 .shutdown
= sd_shutdown
,
488 .eh_action
= sd_eh_action
,
492 * Device no to disk mapping:
494 * major disc2 disc p1
495 * |............|.............|....|....| <- dev_t
498 * Inside a major, we have 16k disks, however mapped non-
499 * contiguously. The first 16 disks are for major0, the next
500 * ones with major1, ... Disk 256 is for major0 again, disk 272
502 * As we stay compatible with our numbering scheme, we can reuse
503 * the well-know SCSI majors 8, 65--71, 136--143.
505 static int sd_major(int major_idx
)
509 return SCSI_DISK0_MAJOR
;
511 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
513 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
516 return 0; /* shut up gcc */
520 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
522 struct scsi_disk
*sdkp
= NULL
;
524 if (disk
->private_data
) {
525 sdkp
= scsi_disk(disk
);
526 if (scsi_device_get(sdkp
->device
) == 0)
527 get_device(&sdkp
->dev
);
534 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
536 struct scsi_disk
*sdkp
;
538 mutex_lock(&sd_ref_mutex
);
539 sdkp
= __scsi_disk_get(disk
);
540 mutex_unlock(&sd_ref_mutex
);
544 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
546 struct scsi_disk
*sdkp
;
548 mutex_lock(&sd_ref_mutex
);
549 sdkp
= dev_get_drvdata(dev
);
551 sdkp
= __scsi_disk_get(sdkp
->disk
);
552 mutex_unlock(&sd_ref_mutex
);
556 static void scsi_disk_put(struct scsi_disk
*sdkp
)
558 struct scsi_device
*sdev
= sdkp
->device
;
560 mutex_lock(&sd_ref_mutex
);
561 put_device(&sdkp
->dev
);
562 scsi_device_put(sdev
);
563 mutex_unlock(&sd_ref_mutex
);
566 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
568 unsigned int prot_op
= SCSI_PROT_NORMAL
;
569 unsigned int dix
= scsi_prot_sg_count(scmd
);
571 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
573 prot_op
= SCSI_PROT_READ_PASS
;
574 else if (dif
&& !dix
)
575 prot_op
= SCSI_PROT_READ_STRIP
;
576 else if (!dif
&& dix
)
577 prot_op
= SCSI_PROT_READ_INSERT
;
580 prot_op
= SCSI_PROT_WRITE_PASS
;
581 else if (dif
&& !dix
)
582 prot_op
= SCSI_PROT_WRITE_INSERT
;
583 else if (!dif
&& dix
)
584 prot_op
= SCSI_PROT_WRITE_STRIP
;
587 scsi_set_prot_op(scmd
, prot_op
);
588 scsi_set_prot_type(scmd
, dif
);
591 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
593 struct request_queue
*q
= sdkp
->disk
->queue
;
594 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
595 unsigned int max_blocks
= 0;
597 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
598 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
600 q
->limits
.discard_granularity
=
601 max(sdkp
->physical_block_size
,
602 sdkp
->unmap_granularity
* logical_block_size
);
604 sdkp
->provisioning_mode
= mode
;
609 q
->limits
.max_discard_sectors
= 0;
610 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
614 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
615 (u32
)SD_MAX_WS16_BLOCKS
);
619 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
620 (u32
)SD_MAX_WS16_BLOCKS
);
624 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
625 (u32
)SD_MAX_WS10_BLOCKS
);
629 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
630 (u32
)SD_MAX_WS10_BLOCKS
);
631 q
->limits
.discard_zeroes_data
= 1;
635 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
636 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
640 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
641 * @sdp: scsi device to operate one
642 * @rq: Request to prepare
644 * Will issue either UNMAP or WRITE SAME(16) depending on preference
645 * indicated by target device.
647 static int sd_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
649 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
650 sector_t sector
= blk_rq_pos(rq
);
651 unsigned int nr_sectors
= blk_rq_sectors(rq
);
652 unsigned int nr_bytes
= blk_rq_bytes(rq
);
658 sector
>>= ilog2(sdp
->sector_size
) - 9;
659 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
660 rq
->timeout
= SD_TIMEOUT
;
662 memset(rq
->cmd
, 0, rq
->cmd_len
);
664 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
666 return BLKPREP_DEFER
;
668 switch (sdkp
->provisioning_mode
) {
670 buf
= page_address(page
);
676 put_unaligned_be16(6 + 16, &buf
[0]);
677 put_unaligned_be16(16, &buf
[2]);
678 put_unaligned_be64(sector
, &buf
[8]);
679 put_unaligned_be32(nr_sectors
, &buf
[16]);
686 rq
->cmd
[0] = WRITE_SAME_16
;
687 rq
->cmd
[1] = 0x8; /* UNMAP */
688 put_unaligned_be64(sector
, &rq
->cmd
[2]);
689 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
691 len
= sdkp
->device
->sector_size
;
697 rq
->cmd
[0] = WRITE_SAME
;
698 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
699 rq
->cmd
[1] = 0x8; /* UNMAP */
700 put_unaligned_be32(sector
, &rq
->cmd
[2]);
701 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
703 len
= sdkp
->device
->sector_size
;
711 blk_add_request_payload(rq
, page
, len
);
712 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
713 rq
->buffer
= page_address(page
);
714 rq
->__data_len
= nr_bytes
;
717 if (ret
!= BLKPREP_OK
) {
724 static void sd_config_write_same(struct scsi_disk
*sdkp
)
726 struct request_queue
*q
= sdkp
->disk
->queue
;
727 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
728 unsigned int blocks
= 0;
730 if (sdkp
->device
->no_write_same
) {
731 sdkp
->max_ws_blocks
= 0;
735 /* Some devices can not handle block counts above 0xffff despite
736 * supporting WRITE SAME(16). Consequently we default to 64k
737 * blocks per I/O unless the device explicitly advertises a
740 if (sdkp
->max_ws_blocks
== 0)
741 sdkp
->max_ws_blocks
= SD_MAX_WS10_BLOCKS
;
743 if (sdkp
->ws16
|| sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
744 blocks
= min_not_zero(sdkp
->max_ws_blocks
,
745 (u32
)SD_MAX_WS16_BLOCKS
);
747 blocks
= min_not_zero(sdkp
->max_ws_blocks
,
748 (u32
)SD_MAX_WS10_BLOCKS
);
751 blk_queue_max_write_same_sectors(q
, blocks
* (logical_block_size
>> 9));
755 * sd_setup_write_same_cmnd - write the same data to multiple blocks
756 * @sdp: scsi device to operate one
757 * @rq: Request to prepare
759 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
760 * preference indicated by target device.
762 static int sd_setup_write_same_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
764 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
765 struct bio
*bio
= rq
->bio
;
766 sector_t sector
= blk_rq_pos(rq
);
767 unsigned int nr_sectors
= blk_rq_sectors(rq
);
768 unsigned int nr_bytes
= blk_rq_bytes(rq
);
771 if (sdkp
->device
->no_write_same
)
774 BUG_ON(bio_offset(bio
) || bio_iovec(bio
)->bv_len
!= sdp
->sector_size
);
776 sector
>>= ilog2(sdp
->sector_size
) - 9;
777 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
779 rq
->__data_len
= sdp
->sector_size
;
780 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
781 memset(rq
->cmd
, 0, rq
->cmd_len
);
783 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
785 rq
->cmd
[0] = WRITE_SAME_16
;
786 put_unaligned_be64(sector
, &rq
->cmd
[2]);
787 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
790 rq
->cmd
[0] = WRITE_SAME
;
791 put_unaligned_be32(sector
, &rq
->cmd
[2]);
792 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
795 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
796 rq
->__data_len
= nr_bytes
;
801 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
803 rq
->timeout
= SD_FLUSH_TIMEOUT
;
804 rq
->retries
= SD_MAX_RETRIES
;
805 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
808 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
811 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
813 if (rq
->cmd_flags
& REQ_DISCARD
) {
814 free_page((unsigned long)rq
->buffer
);
820 * sd_prep_fn - build a scsi (read or write) command from
821 * information in the request structure.
822 * @SCpnt: pointer to mid-level's per scsi command structure that
823 * contains request and into which the scsi command is written
825 * Returns 1 if successful and 0 if error (or cannot be done now).
827 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
829 struct scsi_cmnd
*SCpnt
;
830 struct scsi_device
*sdp
= q
->queuedata
;
831 struct gendisk
*disk
= rq
->rq_disk
;
832 struct scsi_disk
*sdkp
;
833 sector_t block
= blk_rq_pos(rq
);
835 unsigned int this_count
= blk_rq_sectors(rq
);
837 unsigned char protect
;
840 * Discard request come in as REQ_TYPE_FS but we turn them into
841 * block PC requests to make life easier.
843 if (rq
->cmd_flags
& REQ_DISCARD
) {
844 ret
= sd_setup_discard_cmnd(sdp
, rq
);
846 } else if (rq
->cmd_flags
& REQ_WRITE_SAME
) {
847 ret
= sd_setup_write_same_cmnd(sdp
, rq
);
849 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
850 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
852 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
853 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
855 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
859 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
860 if (ret
!= BLKPREP_OK
)
863 sdkp
= scsi_disk(disk
);
865 /* from here on until we're complete, any goto out
866 * is used for a killable error condition */
869 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
870 "sd_prep_fn: block=%llu, "
872 (unsigned long long)block
,
875 if (!sdp
|| !scsi_device_online(sdp
) ||
876 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
877 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
878 "Finishing %u sectors\n",
879 blk_rq_sectors(rq
)));
880 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
881 "Retry with 0x%p\n", SCpnt
));
887 * quietly refuse to do anything to a changed disc until
888 * the changed bit has been reset
890 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
895 * Some SD card readers can't handle multi-sector accesses which touch
896 * the last one or two hardware sectors. Split accesses as needed.
898 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
899 (sdp
->sector_size
/ 512);
901 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
902 if (block
< threshold
) {
903 /* Access up to the threshold but not beyond */
904 this_count
= threshold
- block
;
906 /* Access only a single hardware sector */
907 this_count
= sdp
->sector_size
/ 512;
911 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
912 (unsigned long long)block
));
915 * If we have a 1K hardware sectorsize, prevent access to single
916 * 512 byte sectors. In theory we could handle this - in fact
917 * the scsi cdrom driver must be able to handle this because
918 * we typically use 1K blocksizes, and cdroms typically have
919 * 2K hardware sectorsizes. Of course, things are simpler
920 * with the cdrom, since it is read-only. For performance
921 * reasons, the filesystems should be able to handle this
922 * and not force the scsi disk driver to use bounce buffers
925 if (sdp
->sector_size
== 1024) {
926 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
927 scmd_printk(KERN_ERR
, SCpnt
,
928 "Bad block number requested\n");
932 this_count
= this_count
>> 1;
935 if (sdp
->sector_size
== 2048) {
936 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
937 scmd_printk(KERN_ERR
, SCpnt
,
938 "Bad block number requested\n");
942 this_count
= this_count
>> 2;
945 if (sdp
->sector_size
== 4096) {
946 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
947 scmd_printk(KERN_ERR
, SCpnt
,
948 "Bad block number requested\n");
952 this_count
= this_count
>> 3;
955 if (rq_data_dir(rq
) == WRITE
) {
956 if (!sdp
->writeable
) {
959 SCpnt
->cmnd
[0] = WRITE_6
;
960 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
962 if (blk_integrity_rq(rq
))
963 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
965 } else if (rq_data_dir(rq
) == READ
) {
966 SCpnt
->cmnd
[0] = READ_6
;
967 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
969 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
973 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
974 "%s %d/%u 512 byte blocks.\n",
975 (rq_data_dir(rq
) == WRITE
) ?
976 "writing" : "reading", this_count
,
977 blk_rq_sectors(rq
)));
979 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
980 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
986 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
987 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
989 if (unlikely(SCpnt
->cmnd
== NULL
)) {
994 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
995 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
996 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
997 SCpnt
->cmnd
[7] = 0x18;
998 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
999 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1002 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1003 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1004 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1005 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1006 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1007 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1008 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1009 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1011 /* Expected Indirect LBA */
1012 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1013 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1014 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1015 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1017 /* Transfer length */
1018 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1019 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1020 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1021 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1022 } else if (sdp
->use_16_for_rw
) {
1023 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1024 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1025 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1026 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1027 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1028 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1029 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1030 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1031 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1032 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1033 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1034 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1035 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1036 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1037 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1038 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1039 scsi_device_protection(SCpnt
->device
) ||
1040 SCpnt
->device
->use_10_for_rw
) {
1041 if (this_count
> 0xffff)
1042 this_count
= 0xffff;
1044 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1045 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1046 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1047 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1048 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1049 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1050 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1051 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1052 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1054 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1056 * This happens only if this drive failed
1057 * 10byte rw command with ILLEGAL_REQUEST
1058 * during operation and thus turned off
1061 scmd_printk(KERN_ERR
, SCpnt
,
1062 "FUA write on READ/WRITE(6) drive\n");
1066 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1067 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1068 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1069 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1072 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1074 /* If DIF or DIX is enabled, tell HBA how to handle request */
1075 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
1076 sd_prot_op(SCpnt
, host_dif
);
1079 * We shouldn't disconnect in the middle of a sector, so with a dumb
1080 * host adapter, it's safe to assume that we can at least transfer
1081 * this many bytes between each connect / disconnect.
1083 SCpnt
->transfersize
= sdp
->sector_size
;
1084 SCpnt
->underflow
= this_count
<< 9;
1085 SCpnt
->allowed
= SD_MAX_RETRIES
;
1088 * This indicates that the command is ready from our end to be
1093 return scsi_prep_return(q
, rq
, ret
);
1097 * sd_open - open a scsi disk device
1098 * @inode: only i_rdev member may be used
1099 * @filp: only f_mode and f_flags may be used
1101 * Returns 0 if successful. Returns a negated errno value in case
1104 * Note: This can be called from a user context (e.g. fsck(1) )
1105 * or from within the kernel (e.g. as a result of a mount(1) ).
1106 * In the latter case @inode and @filp carry an abridged amount
1107 * of information as noted above.
1109 * Locking: called with bdev->bd_mutex held.
1111 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1113 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1114 struct scsi_device
*sdev
;
1120 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1122 sdev
= sdkp
->device
;
1124 retval
= scsi_autopm_get_device(sdev
);
1129 * If the device is in error recovery, wait until it is done.
1130 * If the device is offline, then disallow any access to it.
1133 if (!scsi_block_when_processing_errors(sdev
))
1136 if (sdev
->removable
|| sdkp
->write_prot
)
1137 check_disk_change(bdev
);
1140 * If the drive is empty, just let the open fail.
1142 retval
= -ENOMEDIUM
;
1143 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1147 * If the device has the write protect tab set, have the open fail
1148 * if the user expects to be able to write to the thing.
1151 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1155 * It is possible that the disk changing stuff resulted in
1156 * the device being taken offline. If this is the case,
1157 * report this to the user, and don't pretend that the
1158 * open actually succeeded.
1161 if (!scsi_device_online(sdev
))
1164 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1165 if (scsi_block_when_processing_errors(sdev
))
1166 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1172 scsi_autopm_put_device(sdev
);
1174 scsi_disk_put(sdkp
);
1179 * sd_release - invoked when the (last) close(2) is called on this
1181 * @inode: only i_rdev member may be used
1182 * @filp: only f_mode and f_flags may be used
1186 * Note: may block (uninterruptible) if error recovery is underway
1189 * Locking: called with bdev->bd_mutex held.
1191 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
1193 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1194 struct scsi_device
*sdev
= sdkp
->device
;
1196 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1198 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1199 if (scsi_block_when_processing_errors(sdev
))
1200 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1204 * XXX and what if there are packets in flight and this close()
1205 * XXX is followed by a "rmmod sd_mod"?
1208 scsi_autopm_put_device(sdev
);
1209 scsi_disk_put(sdkp
);
1213 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1215 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1216 struct scsi_device
*sdp
= sdkp
->device
;
1217 struct Scsi_Host
*host
= sdp
->host
;
1220 /* default to most commonly used values */
1221 diskinfo
[0] = 0x40; /* 1 << 6 */
1222 diskinfo
[1] = 0x20; /* 1 << 5 */
1223 diskinfo
[2] = sdkp
->capacity
>> 11;
1225 /* override with calculated, extended default, or driver values */
1226 if (host
->hostt
->bios_param
)
1227 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1229 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1231 geo
->heads
= diskinfo
[0];
1232 geo
->sectors
= diskinfo
[1];
1233 geo
->cylinders
= diskinfo
[2];
1238 * sd_ioctl - process an ioctl
1239 * @inode: only i_rdev/i_bdev members may be used
1240 * @filp: only f_mode and f_flags may be used
1241 * @cmd: ioctl command number
1242 * @arg: this is third argument given to ioctl(2) system call.
1243 * Often contains a pointer.
1245 * Returns 0 if successful (some ioctls return positive numbers on
1246 * success as well). Returns a negated errno value in case of error.
1248 * Note: most ioctls are forward onto the block subsystem or further
1249 * down in the scsi subsystem.
1251 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1252 unsigned int cmd
, unsigned long arg
)
1254 struct gendisk
*disk
= bdev
->bd_disk
;
1255 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1256 struct scsi_device
*sdp
= sdkp
->device
;
1257 void __user
*p
= (void __user
*)arg
;
1260 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1261 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1263 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1268 * If we are in the middle of error recovery, don't let anyone
1269 * else try and use this device. Also, if error recovery fails, it
1270 * may try and take the device offline, in which case all further
1271 * access to the device is prohibited.
1273 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1274 (mode
& FMODE_NDELAY
) != 0);
1275 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1279 * Send SCSI addressing ioctls directly to mid level, send other
1280 * ioctls to block level and then onto mid level if they can't be
1284 case SCSI_IOCTL_GET_IDLUN
:
1285 case SCSI_IOCTL_GET_BUS_NUMBER
:
1286 error
= scsi_ioctl(sdp
, cmd
, p
);
1289 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1290 if (error
!= -ENOTTY
)
1292 error
= scsi_ioctl(sdp
, cmd
, p
);
1299 static void set_media_not_present(struct scsi_disk
*sdkp
)
1301 if (sdkp
->media_present
)
1302 sdkp
->device
->changed
= 1;
1304 if (sdkp
->device
->removable
) {
1305 sdkp
->media_present
= 0;
1310 static int media_not_present(struct scsi_disk
*sdkp
,
1311 struct scsi_sense_hdr
*sshdr
)
1313 if (!scsi_sense_valid(sshdr
))
1316 /* not invoked for commands that could return deferred errors */
1317 switch (sshdr
->sense_key
) {
1318 case UNIT_ATTENTION
:
1320 /* medium not present */
1321 if (sshdr
->asc
== 0x3A) {
1322 set_media_not_present(sdkp
);
1330 * sd_check_events - check media events
1331 * @disk: kernel device descriptor
1332 * @clearing: disk events currently being cleared
1334 * Returns mask of DISK_EVENT_*.
1336 * Note: this function is invoked from the block subsystem.
1338 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1340 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1341 struct scsi_device
*sdp
= sdkp
->device
;
1342 struct scsi_sense_hdr
*sshdr
= NULL
;
1345 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1348 * If the device is offline, don't send any commands - just pretend as
1349 * if the command failed. If the device ever comes back online, we
1350 * can deal with it then. It is only because of unrecoverable errors
1351 * that we would ever take a device offline in the first place.
1353 if (!scsi_device_online(sdp
)) {
1354 set_media_not_present(sdkp
);
1359 * Using TEST_UNIT_READY enables differentiation between drive with
1360 * no cartridge loaded - NOT READY, drive with changed cartridge -
1361 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1363 * Drives that auto spin down. eg iomega jaz 1G, will be started
1364 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1365 * sd_revalidate() is called.
1369 if (scsi_block_when_processing_errors(sdp
)) {
1370 retval
= scsi_autopm_get_device(sdp
);
1374 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1375 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1377 scsi_autopm_put_device(sdp
);
1380 /* failed to execute TUR, assume media not present */
1381 if (host_byte(retval
)) {
1382 set_media_not_present(sdkp
);
1386 if (media_not_present(sdkp
, sshdr
))
1390 * For removable scsi disk we have to recognise the presence
1391 * of a disk in the drive.
1393 if (!sdkp
->media_present
)
1395 sdkp
->media_present
= 1;
1398 * sdp->changed is set under the following conditions:
1400 * Medium present state has changed in either direction.
1401 * Device has indicated UNIT_ATTENTION.
1404 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1409 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1412 struct scsi_device
*sdp
= sdkp
->device
;
1413 struct scsi_sense_hdr sshdr
;
1415 if (!scsi_device_online(sdp
))
1419 for (retries
= 3; retries
> 0; --retries
) {
1420 unsigned char cmd
[10] = { 0 };
1422 cmd
[0] = SYNCHRONIZE_CACHE
;
1424 * Leave the rest of the command zero to indicate
1427 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1428 SD_FLUSH_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1434 sd_print_result(sdkp
, res
);
1435 if (driver_byte(res
) & DRIVER_SENSE
)
1436 sd_print_sense_hdr(sdkp
, &sshdr
);
1444 static void sd_rescan(struct device
*dev
)
1446 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1449 revalidate_disk(sdkp
->disk
);
1450 scsi_disk_put(sdkp
);
1455 #ifdef CONFIG_COMPAT
1457 * This gets directly called from VFS. When the ioctl
1458 * is not recognized we go back to the other translation paths.
1460 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1461 unsigned int cmd
, unsigned long arg
)
1463 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1466 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1471 * If we are in the middle of error recovery, don't let anyone
1472 * else try and use this device. Also, if error recovery fails, it
1473 * may try and take the device offline, in which case all further
1474 * access to the device is prohibited.
1476 if (!scsi_block_when_processing_errors(sdev
))
1479 if (sdev
->host
->hostt
->compat_ioctl
) {
1480 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1486 * Let the static ioctl translation table take care of it.
1488 return -ENOIOCTLCMD
;
1492 static const struct block_device_operations sd_fops
= {
1493 .owner
= THIS_MODULE
,
1495 .release
= sd_release
,
1497 .getgeo
= sd_getgeo
,
1498 #ifdef CONFIG_COMPAT
1499 .compat_ioctl
= sd_compat_ioctl
,
1501 .check_events
= sd_check_events
,
1502 .revalidate_disk
= sd_revalidate_disk
,
1503 .unlock_native_capacity
= sd_unlock_native_capacity
,
1507 * sd_eh_action - error handling callback
1508 * @scmd: sd-issued command that has failed
1509 * @eh_cmnd: The command that was sent during error handling
1510 * @eh_cmnd_len: Length of eh_cmnd in bytes
1511 * @eh_disp: The recovery disposition suggested by the midlayer
1513 * This function is called by the SCSI midlayer upon completion of
1514 * an error handling command (TEST UNIT READY, START STOP UNIT,
1515 * etc.) The command sent to the device by the error handler is
1516 * stored in eh_cmnd. The result of sending the eh command is
1517 * passed in eh_disp.
1519 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1520 int eh_cmnd_len
, int eh_disp
)
1522 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1524 if (!scsi_device_online(scmd
->device
) ||
1525 !scsi_medium_access_command(scmd
))
1529 * The device has timed out executing a medium access command.
1530 * However, the TEST UNIT READY command sent during error
1531 * handling completed successfully. Either the device is in the
1532 * process of recovering or has it suffered an internal failure
1533 * that prevents access to the storage medium.
1535 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1536 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1537 sdkp
->medium_access_timed_out
++;
1540 * If the device keeps failing read/write commands but TEST UNIT
1541 * READY always completes successfully we assume that medium
1542 * access is no longer possible and take the device offline.
1544 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1545 scmd_printk(KERN_ERR
, scmd
,
1546 "Medium access timeout failure. Offlining disk!\n");
1547 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1555 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1557 u64 start_lba
= blk_rq_pos(scmd
->request
);
1558 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1562 * resid is optional but mostly filled in. When it's unused,
1563 * its value is zero, so we assume the whole buffer transferred
1565 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1566 unsigned int good_bytes
;
1568 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1571 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1572 SCSI_SENSE_BUFFERSIZE
,
1577 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1580 if (scmd
->device
->sector_size
< 512) {
1581 /* only legitimate sector_size here is 256 */
1585 /* be careful ... don't want any overflows */
1586 u64 factor
= scmd
->device
->sector_size
/ 512;
1587 do_div(start_lba
, factor
);
1588 do_div(end_lba
, factor
);
1591 /* The bad lba was reported incorrectly, we have no idea where
1594 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1597 /* This computation should always be done in terms of
1598 * the resolution of the device's medium.
1600 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1601 return min(good_bytes
, transferred
);
1605 * sd_done - bottom half handler: called when the lower level
1606 * driver has completed (successfully or otherwise) a scsi command.
1607 * @SCpnt: mid-level's per command structure.
1609 * Note: potentially run from within an ISR. Must not block.
1611 static int sd_done(struct scsi_cmnd
*SCpnt
)
1613 int result
= SCpnt
->result
;
1614 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1615 struct scsi_sense_hdr sshdr
;
1616 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1617 struct request
*req
= SCpnt
->request
;
1618 int sense_valid
= 0;
1619 int sense_deferred
= 0;
1620 unsigned char op
= SCpnt
->cmnd
[0];
1621 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1623 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1625 good_bytes
= blk_rq_bytes(req
);
1626 scsi_set_resid(SCpnt
, 0);
1629 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1634 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1636 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1638 #ifdef CONFIG_SCSI_LOGGING
1639 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1641 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1642 "sd_done: sb[respc,sk,asc,"
1643 "ascq]=%x,%x,%x,%x\n",
1644 sshdr
.response_code
,
1645 sshdr
.sense_key
, sshdr
.asc
,
1649 if (driver_byte(result
) != DRIVER_SENSE
&&
1650 (!sense_valid
|| sense_deferred
))
1653 sdkp
->medium_access_timed_out
= 0;
1655 switch (sshdr
.sense_key
) {
1656 case HARDWARE_ERROR
:
1658 good_bytes
= sd_completed_bytes(SCpnt
);
1660 case RECOVERED_ERROR
:
1661 good_bytes
= scsi_bufflen(SCpnt
);
1664 /* This indicates a false check condition, so ignore it. An
1665 * unknown amount of data was transferred so treat it as an
1668 scsi_print_sense("sd", SCpnt
);
1670 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1672 case ABORTED_COMMAND
:
1673 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1674 good_bytes
= sd_completed_bytes(SCpnt
);
1676 case ILLEGAL_REQUEST
:
1677 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1678 good_bytes
= sd_completed_bytes(SCpnt
);
1679 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1680 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1683 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1688 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1690 sdkp
->device
->no_write_same
= 1;
1691 sd_config_write_same(sdkp
);
1694 req
->__data_len
= blk_rq_bytes(req
);
1695 req
->cmd_flags
|= REQ_QUIET
;
1704 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1705 sd_dif_complete(SCpnt
, good_bytes
);
1707 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1708 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1710 /* We have to print a failed command here as the
1711 * extended CDB gets freed before scsi_io_completion()
1715 scsi_print_command(SCpnt
);
1717 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1726 * spinup disk - called only in sd_revalidate_disk()
1729 sd_spinup_disk(struct scsi_disk
*sdkp
)
1731 unsigned char cmd
[10];
1732 unsigned long spintime_expire
= 0;
1733 int retries
, spintime
;
1734 unsigned int the_result
;
1735 struct scsi_sense_hdr sshdr
;
1736 int sense_valid
= 0;
1740 /* Spin up drives, as required. Only do this at boot time */
1741 /* Spinup needs to be done for module loads too. */
1746 cmd
[0] = TEST_UNIT_READY
;
1747 memset((void *) &cmd
[1], 0, 9);
1749 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1752 SD_MAX_RETRIES
, NULL
);
1755 * If the drive has indicated to us that it
1756 * doesn't have any media in it, don't bother
1757 * with any more polling.
1759 if (media_not_present(sdkp
, &sshdr
))
1763 sense_valid
= scsi_sense_valid(&sshdr
);
1765 } while (retries
< 3 &&
1766 (!scsi_status_is_good(the_result
) ||
1767 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1768 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1770 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1771 /* no sense, TUR either succeeded or failed
1772 * with a status error */
1773 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1774 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1775 sd_print_result(sdkp
, the_result
);
1781 * The device does not want the automatic start to be issued.
1783 if (sdkp
->device
->no_start_on_add
)
1786 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1787 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1788 break; /* manual intervention required */
1789 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1790 break; /* standby */
1791 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1792 break; /* unavailable */
1794 * Issue command to spin up drive when not ready
1797 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1798 cmd
[0] = START_STOP
;
1799 cmd
[1] = 1; /* Return immediately */
1800 memset((void *) &cmd
[2], 0, 8);
1801 cmd
[4] = 1; /* Start spin cycle */
1802 if (sdkp
->device
->start_stop_pwr_cond
)
1804 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1806 SD_TIMEOUT
, SD_MAX_RETRIES
,
1808 spintime_expire
= jiffies
+ 100 * HZ
;
1811 /* Wait 1 second for next try */
1816 * Wait for USB flash devices with slow firmware.
1817 * Yes, this sense key/ASC combination shouldn't
1818 * occur here. It's characteristic of these devices.
1820 } else if (sense_valid
&&
1821 sshdr
.sense_key
== UNIT_ATTENTION
&&
1822 sshdr
.asc
== 0x28) {
1824 spintime_expire
= jiffies
+ 5 * HZ
;
1827 /* Wait 1 second for next try */
1830 /* we don't understand the sense code, so it's
1831 * probably pointless to loop */
1833 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1834 sd_print_sense_hdr(sdkp
, &sshdr
);
1839 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1842 if (scsi_status_is_good(the_result
))
1845 printk("not responding...\n");
1851 * Determine whether disk supports Data Integrity Field.
1853 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1855 struct scsi_device
*sdp
= sdkp
->device
;
1859 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1862 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1864 if (type
> SD_DIF_TYPE3_PROTECTION
)
1866 else if (scsi_host_dif_capable(sdp
->host
, type
))
1869 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1872 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1873 " protection type %u. Disabling disk!\n",
1877 sd_printk(KERN_NOTICE
, sdkp
,
1878 "Enabling DIF Type %u protection\n", type
);
1881 sd_printk(KERN_NOTICE
, sdkp
,
1882 "Disabling DIF Type %u protection\n", type
);
1886 sdkp
->protection_type
= type
;
1891 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1892 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1895 sd_print_result(sdkp
, the_result
);
1896 if (driver_byte(the_result
) & DRIVER_SENSE
)
1897 sd_print_sense_hdr(sdkp
, sshdr
);
1899 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1902 * Set dirty bit for removable devices if not ready -
1903 * sometimes drives will not report this properly.
1905 if (sdp
->removable
&&
1906 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1907 set_media_not_present(sdkp
);
1910 * We used to set media_present to 0 here to indicate no media
1911 * in the drive, but some drives fail read capacity even with
1912 * media present, so we can't do that.
1914 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1918 #if RC16_LEN > SD_BUF_SIZE
1919 #error RC16_LEN must not be more than SD_BUF_SIZE
1922 #define READ_CAPACITY_RETRIES_ON_RESET 10
1924 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1925 unsigned char *buffer
)
1927 unsigned char cmd
[16];
1928 struct scsi_sense_hdr sshdr
;
1929 int sense_valid
= 0;
1931 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1932 unsigned int alignment
;
1933 unsigned long long lba
;
1934 unsigned sector_size
;
1936 if (sdp
->no_read_capacity_16
)
1941 cmd
[0] = SERVICE_ACTION_IN
;
1942 cmd
[1] = SAI_READ_CAPACITY_16
;
1944 memset(buffer
, 0, RC16_LEN
);
1946 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1947 buffer
, RC16_LEN
, &sshdr
,
1948 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1950 if (media_not_present(sdkp
, &sshdr
))
1954 sense_valid
= scsi_sense_valid(&sshdr
);
1956 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1957 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1959 /* Invalid Command Operation Code or
1960 * Invalid Field in CDB, just retry
1961 * silently with RC10 */
1964 sshdr
.sense_key
== UNIT_ATTENTION
&&
1965 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1966 /* Device reset might occur several times,
1967 * give it one more chance */
1968 if (--reset_retries
> 0)
1973 } while (the_result
&& retries
);
1976 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1977 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1981 sector_size
= get_unaligned_be32(&buffer
[8]);
1982 lba
= get_unaligned_be64(&buffer
[0]);
1984 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
1989 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1990 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1991 "kernel compiled with support for large block "
1997 /* Logical blocks per physical block exponent */
1998 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2000 /* Lowest aligned logical block */
2001 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2002 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2003 if (alignment
&& sdkp
->first_scan
)
2004 sd_printk(KERN_NOTICE
, sdkp
,
2005 "physical block alignment offset: %u\n", alignment
);
2007 if (buffer
[14] & 0x80) { /* LBPME */
2010 if (buffer
[14] & 0x40) /* LBPRZ */
2013 sd_config_discard(sdkp
, SD_LBP_WS16
);
2016 sdkp
->capacity
= lba
+ 1;
2020 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2021 unsigned char *buffer
)
2023 unsigned char cmd
[16];
2024 struct scsi_sense_hdr sshdr
;
2025 int sense_valid
= 0;
2027 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2029 unsigned sector_size
;
2032 cmd
[0] = READ_CAPACITY
;
2033 memset(&cmd
[1], 0, 9);
2034 memset(buffer
, 0, 8);
2036 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2038 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2040 if (media_not_present(sdkp
, &sshdr
))
2044 sense_valid
= scsi_sense_valid(&sshdr
);
2046 sshdr
.sense_key
== UNIT_ATTENTION
&&
2047 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2048 /* Device reset might occur several times,
2049 * give it one more chance */
2050 if (--reset_retries
> 0)
2055 } while (the_result
&& retries
);
2058 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
2059 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2063 sector_size
= get_unaligned_be32(&buffer
[4]);
2064 lba
= get_unaligned_be32(&buffer
[0]);
2066 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2067 /* Some buggy (usb cardreader) devices return an lba of
2068 0xffffffff when the want to report a size of 0 (with
2069 which they really mean no media is present) */
2071 sdkp
->physical_block_size
= sector_size
;
2075 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2076 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2077 "kernel compiled with support for large block "
2083 sdkp
->capacity
= lba
+ 1;
2084 sdkp
->physical_block_size
= sector_size
;
2088 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2090 if (sdp
->host
->max_cmd_len
< 16)
2092 if (sdp
->try_rc_10_first
)
2094 if (sdp
->scsi_level
> SCSI_SPC_2
)
2096 if (scsi_device_protection(sdp
))
2102 * read disk capacity
2105 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2108 struct scsi_device
*sdp
= sdkp
->device
;
2109 sector_t old_capacity
= sdkp
->capacity
;
2111 if (sd_try_rc16_first(sdp
)) {
2112 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2113 if (sector_size
== -EOVERFLOW
)
2115 if (sector_size
== -ENODEV
)
2117 if (sector_size
< 0)
2118 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2119 if (sector_size
< 0)
2122 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2123 if (sector_size
== -EOVERFLOW
)
2125 if (sector_size
< 0)
2127 if ((sizeof(sdkp
->capacity
) > 4) &&
2128 (sdkp
->capacity
> 0xffffffffULL
)) {
2129 int old_sector_size
= sector_size
;
2130 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2131 "Trying to use READ CAPACITY(16).\n");
2132 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2133 if (sector_size
< 0) {
2134 sd_printk(KERN_NOTICE
, sdkp
,
2135 "Using 0xffffffff as device size\n");
2136 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2137 sector_size
= old_sector_size
;
2143 /* Some devices are known to return the total number of blocks,
2144 * not the highest block number. Some devices have versions
2145 * which do this and others which do not. Some devices we might
2146 * suspect of doing this but we don't know for certain.
2148 * If we know the reported capacity is wrong, decrement it. If
2149 * we can only guess, then assume the number of blocks is even
2150 * (usually true but not always) and err on the side of lowering
2153 if (sdp
->fix_capacity
||
2154 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2155 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2156 "from its reported value: %llu\n",
2157 (unsigned long long) sdkp
->capacity
);
2162 if (sector_size
== 0) {
2164 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2168 if (sector_size
!= 512 &&
2169 sector_size
!= 1024 &&
2170 sector_size
!= 2048 &&
2171 sector_size
!= 4096 &&
2172 sector_size
!= 256) {
2173 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2176 * The user might want to re-format the drive with
2177 * a supported sectorsize. Once this happens, it
2178 * would be relatively trivial to set the thing up.
2179 * For this reason, we leave the thing in the table.
2183 * set a bogus sector size so the normal read/write
2184 * logic in the block layer will eventually refuse any
2185 * request on this device without tripping over power
2186 * of two sector size assumptions
2190 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2193 char cap_str_2
[10], cap_str_10
[10];
2194 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2196 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2198 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2199 sizeof(cap_str_10
));
2201 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2202 sd_printk(KERN_NOTICE
, sdkp
,
2203 "%llu %d-byte logical blocks: (%s/%s)\n",
2204 (unsigned long long)sdkp
->capacity
,
2205 sector_size
, cap_str_10
, cap_str_2
);
2207 if (sdkp
->physical_block_size
!= sector_size
)
2208 sd_printk(KERN_NOTICE
, sdkp
,
2209 "%u-byte physical blocks\n",
2210 sdkp
->physical_block_size
);
2214 sdp
->use_16_for_rw
= (sdkp
->capacity
> 0xffffffff);
2216 /* Rescale capacity to 512-byte units */
2217 if (sector_size
== 4096)
2218 sdkp
->capacity
<<= 3;
2219 else if (sector_size
== 2048)
2220 sdkp
->capacity
<<= 2;
2221 else if (sector_size
== 1024)
2222 sdkp
->capacity
<<= 1;
2223 else if (sector_size
== 256)
2224 sdkp
->capacity
>>= 1;
2226 blk_queue_physical_block_size(sdp
->request_queue
,
2227 sdkp
->physical_block_size
);
2228 sdkp
->device
->sector_size
= sector_size
;
2231 /* called with buffer of length 512 */
2233 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2234 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2235 struct scsi_sense_hdr
*sshdr
)
2237 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2238 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2243 * read write protect setting, if possible - called only in sd_revalidate_disk()
2244 * called with buffer of length SD_BUF_SIZE
2247 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2250 struct scsi_device
*sdp
= sdkp
->device
;
2251 struct scsi_mode_data data
;
2252 int old_wp
= sdkp
->write_prot
;
2254 set_disk_ro(sdkp
->disk
, 0);
2255 if (sdp
->skip_ms_page_3f
) {
2256 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2260 if (sdp
->use_192_bytes_for_3f
) {
2261 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2264 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2265 * We have to start carefully: some devices hang if we ask
2266 * for more than is available.
2268 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2271 * Second attempt: ask for page 0 When only page 0 is
2272 * implemented, a request for page 3F may return Sense Key
2273 * 5: Illegal Request, Sense Code 24: Invalid field in
2276 if (!scsi_status_is_good(res
))
2277 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2280 * Third attempt: ask 255 bytes, as we did earlier.
2282 if (!scsi_status_is_good(res
))
2283 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2287 if (!scsi_status_is_good(res
)) {
2288 sd_printk(KERN_WARNING
, sdkp
,
2289 "Test WP failed, assume Write Enabled\n");
2291 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2292 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2293 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2294 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2295 sdkp
->write_prot
? "on" : "off");
2296 sd_printk(KERN_DEBUG
, sdkp
,
2297 "Mode Sense: %02x %02x %02x %02x\n",
2298 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2304 * sd_read_cache_type - called only from sd_revalidate_disk()
2305 * called with buffer of length SD_BUF_SIZE
2308 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2311 struct scsi_device
*sdp
= sdkp
->device
;
2316 struct scsi_mode_data data
;
2317 struct scsi_sense_hdr sshdr
;
2318 int old_wce
= sdkp
->WCE
;
2319 int old_rcd
= sdkp
->RCD
;
2320 int old_dpofua
= sdkp
->DPOFUA
;
2323 if (sdp
->skip_ms_page_8
) {
2324 if (sdp
->type
== TYPE_RBC
)
2327 if (sdp
->skip_ms_page_3f
)
2330 if (sdp
->use_192_bytes_for_3f
)
2334 } else if (sdp
->type
== TYPE_RBC
) {
2342 /* cautiously ask */
2343 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2346 if (!scsi_status_is_good(res
))
2349 if (!data
.header_length
) {
2352 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2355 /* that went OK, now ask for the proper length */
2359 * We're only interested in the first three bytes, actually.
2360 * But the data cache page is defined for the first 20.
2364 else if (len
> SD_BUF_SIZE
) {
2365 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2366 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2369 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2373 if (len
> first_len
)
2374 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2377 if (scsi_status_is_good(res
)) {
2378 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2380 while (offset
< len
) {
2381 u8 page_code
= buffer
[offset
] & 0x3F;
2382 u8 spf
= buffer
[offset
] & 0x40;
2384 if (page_code
== 8 || page_code
== 6) {
2385 /* We're interested only in the first 3 bytes.
2387 if (len
- offset
<= 2) {
2388 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2389 "mode parameter data\n");
2392 modepage
= page_code
;
2396 /* Go to the next page */
2397 if (spf
&& len
- offset
> 3)
2398 offset
+= 4 + (buffer
[offset
+2] << 8) +
2400 else if (!spf
&& len
- offset
> 1)
2401 offset
+= 2 + buffer
[offset
+1];
2403 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2404 "mode parameter data\n");
2410 if (modepage
== 0x3F) {
2411 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page "
2414 } else if ((buffer
[offset
] & 0x3f) != modepage
) {
2415 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
2419 if (modepage
== 8) {
2420 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2421 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2423 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2427 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2428 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2429 sd_printk(KERN_NOTICE
, sdkp
,
2430 "Uses READ/WRITE(6), disabling FUA\n");
2434 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2435 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2436 sd_printk(KERN_NOTICE
, sdkp
,
2437 "Write cache: %s, read cache: %s, %s\n",
2438 sdkp
->WCE
? "enabled" : "disabled",
2439 sdkp
->RCD
? "disabled" : "enabled",
2440 sdkp
->DPOFUA
? "supports DPO and FUA"
2441 : "doesn't support DPO or FUA");
2447 if (scsi_sense_valid(&sshdr
) &&
2448 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2449 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2450 /* Invalid field in CDB */
2451 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2453 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2456 if (sdp
->wce_default_on
) {
2457 sd_printk(KERN_NOTICE
, sdkp
, "Assuming drive cache: write back\n");
2460 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2468 * The ATO bit indicates whether the DIF application tag is available
2469 * for use by the operating system.
2471 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2474 struct scsi_device
*sdp
= sdkp
->device
;
2475 struct scsi_mode_data data
;
2476 struct scsi_sense_hdr sshdr
;
2478 if (sdp
->type
!= TYPE_DISK
)
2481 if (sdkp
->protection_type
== 0)
2484 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2485 SD_MAX_RETRIES
, &data
, &sshdr
);
2487 if (!scsi_status_is_good(res
) || !data
.header_length
||
2489 sd_printk(KERN_WARNING
, sdkp
,
2490 "getting Control mode page failed, assume no ATO\n");
2492 if (scsi_sense_valid(&sshdr
))
2493 sd_print_sense_hdr(sdkp
, &sshdr
);
2498 offset
= data
.header_length
+ data
.block_descriptor_length
;
2500 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2501 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2505 if ((buffer
[offset
+ 5] & 0x80) == 0)
2514 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2515 * @disk: disk to query
2517 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2519 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2520 const int vpd_len
= 64;
2521 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2524 /* Block Limits VPD */
2525 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2528 blk_queue_io_min(sdkp
->disk
->queue
,
2529 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2530 blk_queue_io_opt(sdkp
->disk
->queue
,
2531 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2533 if (buffer
[3] == 0x3c) {
2534 unsigned int lba_count
, desc_count
;
2536 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2541 lba_count
= get_unaligned_be32(&buffer
[20]);
2542 desc_count
= get_unaligned_be32(&buffer
[24]);
2544 if (lba_count
&& desc_count
)
2545 sdkp
->max_unmap_blocks
= lba_count
;
2547 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2549 if (buffer
[32] & 0x80)
2550 sdkp
->unmap_alignment
=
2551 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2553 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2555 if (sdkp
->max_unmap_blocks
)
2556 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2558 sd_config_discard(sdkp
, SD_LBP_WS16
);
2560 } else { /* LBP VPD page tells us what to use */
2562 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2563 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2564 else if (sdkp
->lbpws
)
2565 sd_config_discard(sdkp
, SD_LBP_WS16
);
2566 else if (sdkp
->lbpws10
)
2567 sd_config_discard(sdkp
, SD_LBP_WS10
);
2569 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2578 * sd_read_block_characteristics - Query block dev. characteristics
2579 * @disk: disk to query
2581 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2583 unsigned char *buffer
;
2585 const int vpd_len
= 64;
2587 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2590 /* Block Device Characteristics VPD */
2591 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2594 rot
= get_unaligned_be16(&buffer
[4]);
2597 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2604 * sd_read_block_provisioning - Query provisioning VPD page
2605 * @disk: disk to query
2607 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2609 unsigned char *buffer
;
2610 const int vpd_len
= 8;
2612 if (sdkp
->lbpme
== 0)
2615 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2617 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2621 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2622 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2623 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2629 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2631 if (scsi_report_opcode(sdkp
->device
, buffer
, SD_BUF_SIZE
,
2636 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2639 * Although VPD inquiries can go to SCSI-2 type devices,
2640 * some USB ones crash on receiving them, and the pages
2641 * we currently ask for are for SPC-3 and beyond
2643 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2649 * sd_revalidate_disk - called the first time a new disk is seen,
2650 * performs disk spin up, read_capacity, etc.
2651 * @disk: struct gendisk we care about
2653 static int sd_revalidate_disk(struct gendisk
*disk
)
2655 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2656 struct scsi_device
*sdp
= sdkp
->device
;
2657 unsigned char *buffer
;
2660 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2661 "sd_revalidate_disk\n"));
2664 * If the device is offline, don't try and read capacity or any
2665 * of the other niceties.
2667 if (!scsi_device_online(sdp
))
2670 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2672 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2673 "allocation failure.\n");
2677 sd_spinup_disk(sdkp
);
2680 * Without media there is no reason to ask; moreover, some devices
2681 * react badly if we do.
2683 if (sdkp
->media_present
) {
2684 sd_read_capacity(sdkp
, buffer
);
2686 if (sd_try_extended_inquiry(sdp
)) {
2687 sd_read_block_provisioning(sdkp
);
2688 sd_read_block_limits(sdkp
);
2689 sd_read_block_characteristics(sdkp
);
2692 sd_read_write_protect_flag(sdkp
, buffer
);
2693 sd_read_cache_type(sdkp
, buffer
);
2694 sd_read_app_tag_own(sdkp
, buffer
);
2695 sd_read_write_same(sdkp
, buffer
);
2698 sdkp
->first_scan
= 0;
2701 * We now have all cache related info, determine how we deal
2702 * with flush requests.
2710 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2712 set_capacity(disk
, sdkp
->capacity
);
2713 sd_config_write_same(sdkp
);
2721 * sd_unlock_native_capacity - unlock native capacity
2722 * @disk: struct gendisk to set capacity for
2724 * Block layer calls this function if it detects that partitions
2725 * on @disk reach beyond the end of the device. If the SCSI host
2726 * implements ->unlock_native_capacity() method, it's invoked to
2727 * give it a chance to adjust the device capacity.
2730 * Defined by block layer. Might sleep.
2732 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2734 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2736 if (sdev
->host
->hostt
->unlock_native_capacity
)
2737 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2741 * sd_format_disk_name - format disk name
2742 * @prefix: name prefix - ie. "sd" for SCSI disks
2743 * @index: index of the disk to format name for
2744 * @buf: output buffer
2745 * @buflen: length of the output buffer
2747 * SCSI disk names starts at sda. The 26th device is sdz and the
2748 * 27th is sdaa. The last one for two lettered suffix is sdzz
2749 * which is followed by sdaaa.
2751 * This is basically 26 base counting with one extra 'nil' entry
2752 * at the beginning from the second digit on and can be
2753 * determined using similar method as 26 base conversion with the
2754 * index shifted -1 after each digit is computed.
2760 * 0 on success, -errno on failure.
2762 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2764 const int base
= 'z' - 'a' + 1;
2765 char *begin
= buf
+ strlen(prefix
);
2766 char *end
= buf
+ buflen
;
2776 *--p
= 'a' + (index
% unit
);
2777 index
= (index
/ unit
) - 1;
2778 } while (index
>= 0);
2780 memmove(begin
, p
, end
- p
);
2781 memcpy(buf
, prefix
, strlen(prefix
));
2787 * The asynchronous part of sd_probe
2789 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2791 struct scsi_disk
*sdkp
= data
;
2792 struct scsi_device
*sdp
;
2799 index
= sdkp
->index
;
2800 dev
= &sdp
->sdev_gendev
;
2802 gd
->major
= sd_major((index
& 0xf0) >> 4);
2803 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2804 gd
->minors
= SD_MINORS
;
2806 gd
->fops
= &sd_fops
;
2807 gd
->private_data
= &sdkp
->driver
;
2808 gd
->queue
= sdkp
->device
->request_queue
;
2810 /* defaults, until the device tells us otherwise */
2811 sdp
->sector_size
= 512;
2813 sdkp
->media_present
= 1;
2814 sdkp
->write_prot
= 0;
2818 sdkp
->first_scan
= 1;
2819 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2821 sd_revalidate_disk(gd
);
2823 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2824 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2826 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2827 gd
->flags
= GENHD_FL_EXT_DEVT
;
2828 if (sdp
->removable
) {
2829 gd
->flags
|= GENHD_FL_REMOVABLE
;
2830 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2835 sd_dif_config_host(sdkp
);
2837 sd_revalidate_disk(gd
);
2839 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2840 sdp
->removable
? "removable " : "");
2841 scsi_autopm_put_device(sdp
);
2842 put_device(&sdkp
->dev
);
2846 * sd_probe - called during driver initialization and whenever a
2847 * new scsi device is attached to the system. It is called once
2848 * for each scsi device (not just disks) present.
2849 * @dev: pointer to device object
2851 * Returns 0 if successful (or not interested in this scsi device
2852 * (e.g. scanner)); 1 when there is an error.
2854 * Note: this function is invoked from the scsi mid-level.
2855 * This function sets up the mapping between a given
2856 * <host,channel,id,lun> (found in sdp) and new device name
2857 * (e.g. /dev/sda). More precisely it is the block device major
2858 * and minor number that is chosen here.
2860 * Assume sd_probe is not re-entrant (for time being)
2861 * Also think about sd_probe() and sd_remove() running coincidentally.
2863 static int sd_probe(struct device
*dev
)
2865 struct scsi_device
*sdp
= to_scsi_device(dev
);
2866 struct scsi_disk
*sdkp
;
2872 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2875 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2879 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2883 gd
= alloc_disk(SD_MINORS
);
2888 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2891 spin_lock(&sd_index_lock
);
2892 error
= ida_get_new(&sd_index_ida
, &index
);
2893 spin_unlock(&sd_index_lock
);
2894 } while (error
== -EAGAIN
);
2897 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2901 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2903 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2904 goto out_free_index
;
2908 sdkp
->driver
= &sd_template
;
2910 sdkp
->index
= index
;
2911 atomic_set(&sdkp
->openers
, 0);
2912 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2914 if (!sdp
->request_queue
->rq_timeout
) {
2915 if (sdp
->type
!= TYPE_MOD
)
2916 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2918 blk_queue_rq_timeout(sdp
->request_queue
,
2922 device_initialize(&sdkp
->dev
);
2923 sdkp
->dev
.parent
= dev
;
2924 sdkp
->dev
.class = &sd_disk_class
;
2925 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2927 if (device_add(&sdkp
->dev
))
2928 goto out_free_index
;
2931 dev_set_drvdata(dev
, sdkp
);
2933 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2934 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2939 spin_lock(&sd_index_lock
);
2940 ida_remove(&sd_index_ida
, index
);
2941 spin_unlock(&sd_index_lock
);
2951 * sd_remove - called whenever a scsi disk (previously recognized by
2952 * sd_probe) is detached from the system. It is called (potentially
2953 * multiple times) during sd module unload.
2954 * @sdp: pointer to mid level scsi device object
2956 * Note: this function is invoked from the scsi mid-level.
2957 * This function potentially frees up a device name (e.g. /dev/sdc)
2958 * that could be re-used by a subsequent sd_probe().
2959 * This function is not called when the built-in sd driver is "exit-ed".
2961 static int sd_remove(struct device
*dev
)
2963 struct scsi_disk
*sdkp
;
2965 sdkp
= dev_get_drvdata(dev
);
2966 scsi_autopm_get_device(sdkp
->device
);
2968 async_synchronize_full_domain(&scsi_sd_probe_domain
);
2969 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2970 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2971 device_del(&sdkp
->dev
);
2972 del_gendisk(sdkp
->disk
);
2975 mutex_lock(&sd_ref_mutex
);
2976 dev_set_drvdata(dev
, NULL
);
2977 put_device(&sdkp
->dev
);
2978 mutex_unlock(&sd_ref_mutex
);
2984 * scsi_disk_release - Called to free the scsi_disk structure
2985 * @dev: pointer to embedded class device
2987 * sd_ref_mutex must be held entering this routine. Because it is
2988 * called on last put, you should always use the scsi_disk_get()
2989 * scsi_disk_put() helpers which manipulate the semaphore directly
2990 * and never do a direct put_device.
2992 static void scsi_disk_release(struct device
*dev
)
2994 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2995 struct gendisk
*disk
= sdkp
->disk
;
2997 spin_lock(&sd_index_lock
);
2998 ida_remove(&sd_index_ida
, sdkp
->index
);
2999 spin_unlock(&sd_index_lock
);
3001 disk
->private_data
= NULL
;
3003 put_device(&sdkp
->device
->sdev_gendev
);
3008 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3010 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3011 struct scsi_sense_hdr sshdr
;
3012 struct scsi_device
*sdp
= sdkp
->device
;
3016 cmd
[4] |= 1; /* START */
3018 if (sdp
->start_stop_pwr_cond
)
3019 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3021 if (!scsi_device_online(sdp
))
3024 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3025 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
3027 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
3028 sd_print_result(sdkp
, res
);
3029 if (driver_byte(res
) & DRIVER_SENSE
)
3030 sd_print_sense_hdr(sdkp
, &sshdr
);
3037 * Send a SYNCHRONIZE CACHE instruction down to the device through
3038 * the normal SCSI command structure. Wait for the command to
3041 static void sd_shutdown(struct device
*dev
)
3043 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3046 return; /* this can happen */
3048 if (pm_runtime_suspended(dev
))
3052 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3053 sd_sync_cache(sdkp
);
3056 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3057 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3058 sd_start_stop_device(sdkp
, 0);
3062 scsi_disk_put(sdkp
);
3065 static int sd_suspend(struct device
*dev
)
3067 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3071 return 0; /* this can happen */
3074 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3075 ret
= sd_sync_cache(sdkp
);
3080 if (sdkp
->device
->manage_start_stop
) {
3081 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3082 ret
= sd_start_stop_device(sdkp
, 0);
3086 scsi_disk_put(sdkp
);
3090 static int sd_resume(struct device
*dev
)
3092 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3095 if (!sdkp
->device
->manage_start_stop
)
3098 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3099 ret
= sd_start_stop_device(sdkp
, 1);
3102 scsi_disk_put(sdkp
);
3107 * init_sd - entry point for this driver (both when built in or when
3110 * Note: this function registers this driver with the scsi mid-level.
3112 static int __init
init_sd(void)
3114 int majors
= 0, i
, err
;
3116 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3118 for (i
= 0; i
< SD_MAJORS
; i
++)
3119 if (register_blkdev(sd_major(i
), "sd") == 0)
3125 err
= class_register(&sd_disk_class
);
3129 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3131 if (!sd_cdb_cache
) {
3132 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3136 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3138 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3142 err
= scsi_register_driver(&sd_template
.gendrv
);
3144 goto err_out_driver
;
3149 mempool_destroy(sd_cdb_pool
);
3152 kmem_cache_destroy(sd_cdb_cache
);
3155 class_unregister(&sd_disk_class
);
3157 for (i
= 0; i
< SD_MAJORS
; i
++)
3158 unregister_blkdev(sd_major(i
), "sd");
3163 * exit_sd - exit point for this driver (when it is a module).
3165 * Note: this function unregisters this driver from the scsi mid-level.
3167 static void __exit
exit_sd(void)
3171 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3173 scsi_unregister_driver(&sd_template
.gendrv
);
3174 mempool_destroy(sd_cdb_pool
);
3175 kmem_cache_destroy(sd_cdb_cache
);
3177 class_unregister(&sd_disk_class
);
3179 for (i
= 0; i
< SD_MAJORS
; i
++)
3180 unregister_blkdev(sd_major(i
), "sd");
3183 module_init(init_sd
);
3184 module_exit(exit_sd
);
3186 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3187 struct scsi_sense_hdr
*sshdr
)
3189 sd_printk(KERN_INFO
, sdkp
, " ");
3190 scsi_show_sense_hdr(sshdr
);
3191 sd_printk(KERN_INFO
, sdkp
, " ");
3192 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3195 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3197 sd_printk(KERN_INFO
, sdkp
, " ");
3198 scsi_show_result(result
);