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 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 sdkp
->max_ws_blocks
= max
;
448 sd_config_write_same(sdkp
);
453 static struct device_attribute sd_disk_attrs
[] = {
454 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
455 sd_store_cache_type
),
456 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
457 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
458 sd_store_allow_restart
),
459 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
460 sd_store_manage_start_stop
),
461 __ATTR(protection_type
, S_IRUGO
|S_IWUSR
, sd_show_protection_type
,
462 sd_store_protection_type
),
463 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
464 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
465 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
466 __ATTR(provisioning_mode
, S_IRUGO
|S_IWUSR
, sd_show_provisioning_mode
,
467 sd_store_provisioning_mode
),
468 __ATTR(max_write_same_blocks
, S_IRUGO
|S_IWUSR
,
469 sd_show_write_same_blocks
, sd_store_write_same_blocks
),
470 __ATTR(max_medium_access_timeouts
, S_IRUGO
|S_IWUSR
,
471 sd_show_max_medium_access_timeouts
,
472 sd_store_max_medium_access_timeouts
),
476 static struct class sd_disk_class
= {
478 .owner
= THIS_MODULE
,
479 .dev_release
= scsi_disk_release
,
480 .dev_attrs
= sd_disk_attrs
,
483 static const struct dev_pm_ops sd_pm_ops
= {
484 .suspend
= sd_suspend
,
486 .poweroff
= sd_suspend
,
487 .restore
= sd_resume
,
488 .runtime_suspend
= sd_suspend
,
489 .runtime_resume
= sd_resume
,
492 static struct scsi_driver sd_template
= {
493 .owner
= THIS_MODULE
,
498 .shutdown
= sd_shutdown
,
503 .eh_action
= sd_eh_action
,
507 * Device no to disk mapping:
509 * major disc2 disc p1
510 * |............|.............|....|....| <- dev_t
513 * Inside a major, we have 16k disks, however mapped non-
514 * contiguously. The first 16 disks are for major0, the next
515 * ones with major1, ... Disk 256 is for major0 again, disk 272
517 * As we stay compatible with our numbering scheme, we can reuse
518 * the well-know SCSI majors 8, 65--71, 136--143.
520 static int sd_major(int major_idx
)
524 return SCSI_DISK0_MAJOR
;
526 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
528 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
531 return 0; /* shut up gcc */
535 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
537 struct scsi_disk
*sdkp
= NULL
;
539 if (disk
->private_data
) {
540 sdkp
= scsi_disk(disk
);
541 if (scsi_device_get(sdkp
->device
) == 0)
542 get_device(&sdkp
->dev
);
549 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
551 struct scsi_disk
*sdkp
;
553 mutex_lock(&sd_ref_mutex
);
554 sdkp
= __scsi_disk_get(disk
);
555 mutex_unlock(&sd_ref_mutex
);
559 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
561 struct scsi_disk
*sdkp
;
563 mutex_lock(&sd_ref_mutex
);
564 sdkp
= dev_get_drvdata(dev
);
566 sdkp
= __scsi_disk_get(sdkp
->disk
);
567 mutex_unlock(&sd_ref_mutex
);
571 static void scsi_disk_put(struct scsi_disk
*sdkp
)
573 struct scsi_device
*sdev
= sdkp
->device
;
575 mutex_lock(&sd_ref_mutex
);
576 put_device(&sdkp
->dev
);
577 scsi_device_put(sdev
);
578 mutex_unlock(&sd_ref_mutex
);
581 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
583 unsigned int prot_op
= SCSI_PROT_NORMAL
;
584 unsigned int dix
= scsi_prot_sg_count(scmd
);
586 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
588 prot_op
= SCSI_PROT_READ_PASS
;
589 else if (dif
&& !dix
)
590 prot_op
= SCSI_PROT_READ_STRIP
;
591 else if (!dif
&& dix
)
592 prot_op
= SCSI_PROT_READ_INSERT
;
595 prot_op
= SCSI_PROT_WRITE_PASS
;
596 else if (dif
&& !dix
)
597 prot_op
= SCSI_PROT_WRITE_INSERT
;
598 else if (!dif
&& dix
)
599 prot_op
= SCSI_PROT_WRITE_STRIP
;
602 scsi_set_prot_op(scmd
, prot_op
);
603 scsi_set_prot_type(scmd
, dif
);
606 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
608 struct request_queue
*q
= sdkp
->disk
->queue
;
609 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
610 unsigned int max_blocks
= 0;
612 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
613 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
615 q
->limits
.discard_granularity
=
616 max(sdkp
->physical_block_size
,
617 sdkp
->unmap_granularity
* logical_block_size
);
619 sdkp
->provisioning_mode
= mode
;
624 q
->limits
.max_discard_sectors
= 0;
625 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
629 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
630 (u32
)SD_MAX_WS16_BLOCKS
);
634 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
635 (u32
)SD_MAX_WS16_BLOCKS
);
639 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
640 (u32
)SD_MAX_WS10_BLOCKS
);
644 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
645 (u32
)SD_MAX_WS10_BLOCKS
);
646 q
->limits
.discard_zeroes_data
= 1;
650 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
651 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
655 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
656 * @sdp: scsi device to operate one
657 * @rq: Request to prepare
659 * Will issue either UNMAP or WRITE SAME(16) depending on preference
660 * indicated by target device.
662 static int sd_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
664 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
665 sector_t sector
= blk_rq_pos(rq
);
666 unsigned int nr_sectors
= blk_rq_sectors(rq
);
667 unsigned int nr_bytes
= blk_rq_bytes(rq
);
673 sector
>>= ilog2(sdp
->sector_size
) - 9;
674 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
675 rq
->timeout
= SD_TIMEOUT
;
677 memset(rq
->cmd
, 0, rq
->cmd_len
);
679 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
681 return BLKPREP_DEFER
;
683 switch (sdkp
->provisioning_mode
) {
685 buf
= page_address(page
);
691 put_unaligned_be16(6 + 16, &buf
[0]);
692 put_unaligned_be16(16, &buf
[2]);
693 put_unaligned_be64(sector
, &buf
[8]);
694 put_unaligned_be32(nr_sectors
, &buf
[16]);
701 rq
->cmd
[0] = WRITE_SAME_16
;
702 rq
->cmd
[1] = 0x8; /* UNMAP */
703 put_unaligned_be64(sector
, &rq
->cmd
[2]);
704 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
706 len
= sdkp
->device
->sector_size
;
712 rq
->cmd
[0] = WRITE_SAME
;
713 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
714 rq
->cmd
[1] = 0x8; /* UNMAP */
715 put_unaligned_be32(sector
, &rq
->cmd
[2]);
716 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
718 len
= sdkp
->device
->sector_size
;
726 blk_add_request_payload(rq
, page
, len
);
727 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
728 rq
->buffer
= page_address(page
);
729 rq
->__data_len
= nr_bytes
;
732 if (ret
!= BLKPREP_OK
) {
739 static void sd_config_write_same(struct scsi_disk
*sdkp
)
741 struct request_queue
*q
= sdkp
->disk
->queue
;
742 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
743 unsigned int blocks
= 0;
745 if (sdkp
->device
->no_write_same
) {
746 sdkp
->max_ws_blocks
= 0;
750 /* Some devices can not handle block counts above 0xffff despite
751 * supporting WRITE SAME(16). Consequently we default to 64k
752 * blocks per I/O unless the device explicitly advertises a
755 if (sdkp
->max_ws_blocks
== 0)
756 sdkp
->max_ws_blocks
= SD_MAX_WS10_BLOCKS
;
758 if (sdkp
->ws16
|| sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
759 blocks
= min_not_zero(sdkp
->max_ws_blocks
,
760 (u32
)SD_MAX_WS16_BLOCKS
);
762 blocks
= min_not_zero(sdkp
->max_ws_blocks
,
763 (u32
)SD_MAX_WS10_BLOCKS
);
766 blk_queue_max_write_same_sectors(q
, blocks
* (logical_block_size
>> 9));
770 * sd_setup_write_same_cmnd - write the same data to multiple blocks
771 * @sdp: scsi device to operate one
772 * @rq: Request to prepare
774 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
775 * preference indicated by target device.
777 static int sd_setup_write_same_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
779 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
780 struct bio
*bio
= rq
->bio
;
781 sector_t sector
= blk_rq_pos(rq
);
782 unsigned int nr_sectors
= blk_rq_sectors(rq
);
783 unsigned int nr_bytes
= blk_rq_bytes(rq
);
786 if (sdkp
->device
->no_write_same
)
789 BUG_ON(bio_offset(bio
) || bio_iovec(bio
)->bv_len
!= sdp
->sector_size
);
791 sector
>>= ilog2(sdp
->sector_size
) - 9;
792 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
794 rq
->__data_len
= sdp
->sector_size
;
795 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
796 memset(rq
->cmd
, 0, rq
->cmd_len
);
798 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
800 rq
->cmd
[0] = WRITE_SAME_16
;
801 put_unaligned_be64(sector
, &rq
->cmd
[2]);
802 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
805 rq
->cmd
[0] = WRITE_SAME
;
806 put_unaligned_be32(sector
, &rq
->cmd
[2]);
807 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
810 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
811 rq
->__data_len
= nr_bytes
;
816 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
818 rq
->timeout
= SD_FLUSH_TIMEOUT
;
819 rq
->retries
= SD_MAX_RETRIES
;
820 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
823 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
826 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
828 if (rq
->cmd_flags
& REQ_DISCARD
) {
829 free_page((unsigned long)rq
->buffer
);
835 * sd_prep_fn - build a scsi (read or write) command from
836 * information in the request structure.
837 * @SCpnt: pointer to mid-level's per scsi command structure that
838 * contains request and into which the scsi command is written
840 * Returns 1 if successful and 0 if error (or cannot be done now).
842 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
844 struct scsi_cmnd
*SCpnt
;
845 struct scsi_device
*sdp
= q
->queuedata
;
846 struct gendisk
*disk
= rq
->rq_disk
;
847 struct scsi_disk
*sdkp
;
848 sector_t block
= blk_rq_pos(rq
);
850 unsigned int this_count
= blk_rq_sectors(rq
);
852 unsigned char protect
;
855 * Discard request come in as REQ_TYPE_FS but we turn them into
856 * block PC requests to make life easier.
858 if (rq
->cmd_flags
& REQ_DISCARD
) {
859 ret
= sd_setup_discard_cmnd(sdp
, rq
);
861 } else if (rq
->cmd_flags
& REQ_WRITE_SAME
) {
862 ret
= sd_setup_write_same_cmnd(sdp
, rq
);
864 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
865 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
867 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
868 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
870 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
874 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
875 if (ret
!= BLKPREP_OK
)
878 sdkp
= scsi_disk(disk
);
880 /* from here on until we're complete, any goto out
881 * is used for a killable error condition */
884 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
885 "sd_prep_fn: block=%llu, "
887 (unsigned long long)block
,
890 if (!sdp
|| !scsi_device_online(sdp
) ||
891 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
892 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
893 "Finishing %u sectors\n",
894 blk_rq_sectors(rq
)));
895 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
896 "Retry with 0x%p\n", SCpnt
));
902 * quietly refuse to do anything to a changed disc until
903 * the changed bit has been reset
905 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
910 * Some SD card readers can't handle multi-sector accesses which touch
911 * the last one or two hardware sectors. Split accesses as needed.
913 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
914 (sdp
->sector_size
/ 512);
916 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
917 if (block
< threshold
) {
918 /* Access up to the threshold but not beyond */
919 this_count
= threshold
- block
;
921 /* Access only a single hardware sector */
922 this_count
= sdp
->sector_size
/ 512;
926 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
927 (unsigned long long)block
));
930 * If we have a 1K hardware sectorsize, prevent access to single
931 * 512 byte sectors. In theory we could handle this - in fact
932 * the scsi cdrom driver must be able to handle this because
933 * we typically use 1K blocksizes, and cdroms typically have
934 * 2K hardware sectorsizes. Of course, things are simpler
935 * with the cdrom, since it is read-only. For performance
936 * reasons, the filesystems should be able to handle this
937 * and not force the scsi disk driver to use bounce buffers
940 if (sdp
->sector_size
== 1024) {
941 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
942 scmd_printk(KERN_ERR
, SCpnt
,
943 "Bad block number requested\n");
947 this_count
= this_count
>> 1;
950 if (sdp
->sector_size
== 2048) {
951 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
952 scmd_printk(KERN_ERR
, SCpnt
,
953 "Bad block number requested\n");
957 this_count
= this_count
>> 2;
960 if (sdp
->sector_size
== 4096) {
961 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
962 scmd_printk(KERN_ERR
, SCpnt
,
963 "Bad block number requested\n");
967 this_count
= this_count
>> 3;
970 if (rq_data_dir(rq
) == WRITE
) {
971 if (!sdp
->writeable
) {
974 SCpnt
->cmnd
[0] = WRITE_6
;
975 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
977 if (blk_integrity_rq(rq
))
978 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
980 } else if (rq_data_dir(rq
) == READ
) {
981 SCpnt
->cmnd
[0] = READ_6
;
982 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
984 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
988 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
989 "%s %d/%u 512 byte blocks.\n",
990 (rq_data_dir(rq
) == WRITE
) ?
991 "writing" : "reading", this_count
,
992 blk_rq_sectors(rq
)));
994 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
995 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
1001 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
1002 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1004 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1005 ret
= BLKPREP_DEFER
;
1009 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1010 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1011 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1012 SCpnt
->cmnd
[7] = 0x18;
1013 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1014 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1017 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1018 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1019 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1020 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1021 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1022 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1023 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1024 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1026 /* Expected Indirect LBA */
1027 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1028 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1029 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1030 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1032 /* Transfer length */
1033 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1034 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1035 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1036 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1037 } else if (sdp
->use_16_for_rw
) {
1038 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1039 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1040 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1041 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1042 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1043 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1044 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1045 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1046 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1047 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1048 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1049 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1050 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1051 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1052 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1053 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1054 scsi_device_protection(SCpnt
->device
) ||
1055 SCpnt
->device
->use_10_for_rw
) {
1056 if (this_count
> 0xffff)
1057 this_count
= 0xffff;
1059 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1060 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1061 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1062 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1063 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1064 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1065 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1066 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1067 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1069 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1071 * This happens only if this drive failed
1072 * 10byte rw command with ILLEGAL_REQUEST
1073 * during operation and thus turned off
1076 scmd_printk(KERN_ERR
, SCpnt
,
1077 "FUA write on READ/WRITE(6) drive\n");
1081 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1082 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1083 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1084 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1087 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1089 /* If DIF or DIX is enabled, tell HBA how to handle request */
1090 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
1091 sd_prot_op(SCpnt
, host_dif
);
1094 * We shouldn't disconnect in the middle of a sector, so with a dumb
1095 * host adapter, it's safe to assume that we can at least transfer
1096 * this many bytes between each connect / disconnect.
1098 SCpnt
->transfersize
= sdp
->sector_size
;
1099 SCpnt
->underflow
= this_count
<< 9;
1100 SCpnt
->allowed
= SD_MAX_RETRIES
;
1103 * This indicates that the command is ready from our end to be
1108 return scsi_prep_return(q
, rq
, ret
);
1112 * sd_open - open a scsi disk device
1113 * @inode: only i_rdev member may be used
1114 * @filp: only f_mode and f_flags may be used
1116 * Returns 0 if successful. Returns a negated errno value in case
1119 * Note: This can be called from a user context (e.g. fsck(1) )
1120 * or from within the kernel (e.g. as a result of a mount(1) ).
1121 * In the latter case @inode and @filp carry an abridged amount
1122 * of information as noted above.
1124 * Locking: called with bdev->bd_mutex held.
1126 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1128 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1129 struct scsi_device
*sdev
;
1135 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1137 sdev
= sdkp
->device
;
1140 * If the device is in error recovery, wait until it is done.
1141 * If the device is offline, then disallow any access to it.
1144 if (!scsi_block_when_processing_errors(sdev
))
1147 if (sdev
->removable
|| sdkp
->write_prot
)
1148 check_disk_change(bdev
);
1151 * If the drive is empty, just let the open fail.
1153 retval
= -ENOMEDIUM
;
1154 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1158 * If the device has the write protect tab set, have the open fail
1159 * if the user expects to be able to write to the thing.
1162 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1166 * It is possible that the disk changing stuff resulted in
1167 * the device being taken offline. If this is the case,
1168 * report this to the user, and don't pretend that the
1169 * open actually succeeded.
1172 if (!scsi_device_online(sdev
))
1175 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1176 if (scsi_block_when_processing_errors(sdev
))
1177 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1183 scsi_disk_put(sdkp
);
1188 * sd_release - invoked when the (last) close(2) is called on this
1190 * @inode: only i_rdev member may be used
1191 * @filp: only f_mode and f_flags may be used
1195 * Note: may block (uninterruptible) if error recovery is underway
1198 * Locking: called with bdev->bd_mutex held.
1200 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1202 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1203 struct scsi_device
*sdev
= sdkp
->device
;
1205 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1207 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1208 if (scsi_block_when_processing_errors(sdev
))
1209 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1213 * XXX and what if there are packets in flight and this close()
1214 * XXX is followed by a "rmmod sd_mod"?
1217 scsi_disk_put(sdkp
);
1220 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1222 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1223 struct scsi_device
*sdp
= sdkp
->device
;
1224 struct Scsi_Host
*host
= sdp
->host
;
1227 /* default to most commonly used values */
1228 diskinfo
[0] = 0x40; /* 1 << 6 */
1229 diskinfo
[1] = 0x20; /* 1 << 5 */
1230 diskinfo
[2] = sdkp
->capacity
>> 11;
1232 /* override with calculated, extended default, or driver values */
1233 if (host
->hostt
->bios_param
)
1234 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1236 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1238 geo
->heads
= diskinfo
[0];
1239 geo
->sectors
= diskinfo
[1];
1240 geo
->cylinders
= diskinfo
[2];
1245 * sd_ioctl - process an ioctl
1246 * @inode: only i_rdev/i_bdev members may be used
1247 * @filp: only f_mode and f_flags may be used
1248 * @cmd: ioctl command number
1249 * @arg: this is third argument given to ioctl(2) system call.
1250 * Often contains a pointer.
1252 * Returns 0 if successful (some ioctls return positive numbers on
1253 * success as well). Returns a negated errno value in case of error.
1255 * Note: most ioctls are forward onto the block subsystem or further
1256 * down in the scsi subsystem.
1258 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1259 unsigned int cmd
, unsigned long arg
)
1261 struct gendisk
*disk
= bdev
->bd_disk
;
1262 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1263 struct scsi_device
*sdp
= sdkp
->device
;
1264 void __user
*p
= (void __user
*)arg
;
1267 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1268 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1270 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1275 * If we are in the middle of error recovery, don't let anyone
1276 * else try and use this device. Also, if error recovery fails, it
1277 * may try and take the device offline, in which case all further
1278 * access to the device is prohibited.
1280 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1281 (mode
& FMODE_NDELAY
) != 0);
1282 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1286 * Send SCSI addressing ioctls directly to mid level, send other
1287 * ioctls to block level and then onto mid level if they can't be
1291 case SCSI_IOCTL_GET_IDLUN
:
1292 case SCSI_IOCTL_GET_BUS_NUMBER
:
1293 error
= scsi_ioctl(sdp
, cmd
, p
);
1296 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1297 if (error
!= -ENOTTY
)
1299 error
= scsi_ioctl(sdp
, cmd
, p
);
1306 static void set_media_not_present(struct scsi_disk
*sdkp
)
1308 if (sdkp
->media_present
)
1309 sdkp
->device
->changed
= 1;
1311 if (sdkp
->device
->removable
) {
1312 sdkp
->media_present
= 0;
1317 static int media_not_present(struct scsi_disk
*sdkp
,
1318 struct scsi_sense_hdr
*sshdr
)
1320 if (!scsi_sense_valid(sshdr
))
1323 /* not invoked for commands that could return deferred errors */
1324 switch (sshdr
->sense_key
) {
1325 case UNIT_ATTENTION
:
1327 /* medium not present */
1328 if (sshdr
->asc
== 0x3A) {
1329 set_media_not_present(sdkp
);
1337 * sd_check_events - check media events
1338 * @disk: kernel device descriptor
1339 * @clearing: disk events currently being cleared
1341 * Returns mask of DISK_EVENT_*.
1343 * Note: this function is invoked from the block subsystem.
1345 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1347 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1348 struct scsi_device
*sdp
= sdkp
->device
;
1349 struct scsi_sense_hdr
*sshdr
= NULL
;
1352 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1355 * If the device is offline, don't send any commands - just pretend as
1356 * if the command failed. If the device ever comes back online, we
1357 * can deal with it then. It is only because of unrecoverable errors
1358 * that we would ever take a device offline in the first place.
1360 if (!scsi_device_online(sdp
)) {
1361 set_media_not_present(sdkp
);
1366 * Using TEST_UNIT_READY enables differentiation between drive with
1367 * no cartridge loaded - NOT READY, drive with changed cartridge -
1368 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1370 * Drives that auto spin down. eg iomega jaz 1G, will be started
1371 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1372 * sd_revalidate() is called.
1376 if (scsi_block_when_processing_errors(sdp
)) {
1377 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1378 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1382 /* failed to execute TUR, assume media not present */
1383 if (host_byte(retval
)) {
1384 set_media_not_present(sdkp
);
1388 if (media_not_present(sdkp
, sshdr
))
1392 * For removable scsi disk we have to recognise the presence
1393 * of a disk in the drive.
1395 if (!sdkp
->media_present
)
1397 sdkp
->media_present
= 1;
1400 * sdp->changed is set under the following conditions:
1402 * Medium present state has changed in either direction.
1403 * Device has indicated UNIT_ATTENTION.
1406 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1411 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1414 struct scsi_device
*sdp
= sdkp
->device
;
1415 struct scsi_sense_hdr sshdr
;
1417 if (!scsi_device_online(sdp
))
1421 for (retries
= 3; retries
> 0; --retries
) {
1422 unsigned char cmd
[10] = { 0 };
1424 cmd
[0] = SYNCHRONIZE_CACHE
;
1426 * Leave the rest of the command zero to indicate
1429 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1430 &sshdr
, SD_FLUSH_TIMEOUT
,
1431 SD_MAX_RETRIES
, NULL
, REQ_PM
);
1437 sd_print_result(sdkp
, res
);
1438 if (driver_byte(res
) & DRIVER_SENSE
)
1439 sd_print_sense_hdr(sdkp
, &sshdr
);
1447 static void sd_rescan(struct device
*dev
)
1449 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1452 revalidate_disk(sdkp
->disk
);
1453 scsi_disk_put(sdkp
);
1458 #ifdef CONFIG_COMPAT
1460 * This gets directly called from VFS. When the ioctl
1461 * is not recognized we go back to the other translation paths.
1463 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1464 unsigned int cmd
, unsigned long arg
)
1466 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1469 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1474 * If we are in the middle of error recovery, don't let anyone
1475 * else try and use this device. Also, if error recovery fails, it
1476 * may try and take the device offline, in which case all further
1477 * access to the device is prohibited.
1479 if (!scsi_block_when_processing_errors(sdev
))
1482 if (sdev
->host
->hostt
->compat_ioctl
) {
1483 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1489 * Let the static ioctl translation table take care of it.
1491 return -ENOIOCTLCMD
;
1495 static const struct block_device_operations sd_fops
= {
1496 .owner
= THIS_MODULE
,
1498 .release
= sd_release
,
1500 .getgeo
= sd_getgeo
,
1501 #ifdef CONFIG_COMPAT
1502 .compat_ioctl
= sd_compat_ioctl
,
1504 .check_events
= sd_check_events
,
1505 .revalidate_disk
= sd_revalidate_disk
,
1506 .unlock_native_capacity
= sd_unlock_native_capacity
,
1510 * sd_eh_action - error handling callback
1511 * @scmd: sd-issued command that has failed
1512 * @eh_cmnd: The command that was sent during error handling
1513 * @eh_cmnd_len: Length of eh_cmnd in bytes
1514 * @eh_disp: The recovery disposition suggested by the midlayer
1516 * This function is called by the SCSI midlayer upon completion of
1517 * an error handling command (TEST UNIT READY, START STOP UNIT,
1518 * etc.) The command sent to the device by the error handler is
1519 * stored in eh_cmnd. The result of sending the eh command is
1520 * passed in eh_disp.
1522 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1523 int eh_cmnd_len
, int eh_disp
)
1525 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1527 if (!scsi_device_online(scmd
->device
) ||
1528 !scsi_medium_access_command(scmd
))
1532 * The device has timed out executing a medium access command.
1533 * However, the TEST UNIT READY command sent during error
1534 * handling completed successfully. Either the device is in the
1535 * process of recovering or has it suffered an internal failure
1536 * that prevents access to the storage medium.
1538 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1539 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1540 sdkp
->medium_access_timed_out
++;
1543 * If the device keeps failing read/write commands but TEST UNIT
1544 * READY always completes successfully we assume that medium
1545 * access is no longer possible and take the device offline.
1547 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1548 scmd_printk(KERN_ERR
, scmd
,
1549 "Medium access timeout failure. Offlining disk!\n");
1550 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1558 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1560 u64 start_lba
= blk_rq_pos(scmd
->request
);
1561 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1565 * resid is optional but mostly filled in. When it's unused,
1566 * its value is zero, so we assume the whole buffer transferred
1568 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1569 unsigned int good_bytes
;
1571 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1574 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1575 SCSI_SENSE_BUFFERSIZE
,
1580 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1583 if (scmd
->device
->sector_size
< 512) {
1584 /* only legitimate sector_size here is 256 */
1588 /* be careful ... don't want any overflows */
1589 u64 factor
= scmd
->device
->sector_size
/ 512;
1590 do_div(start_lba
, factor
);
1591 do_div(end_lba
, factor
);
1594 /* The bad lba was reported incorrectly, we have no idea where
1597 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1600 /* This computation should always be done in terms of
1601 * the resolution of the device's medium.
1603 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1604 return min(good_bytes
, transferred
);
1608 * sd_done - bottom half handler: called when the lower level
1609 * driver has completed (successfully or otherwise) a scsi command.
1610 * @SCpnt: mid-level's per command structure.
1612 * Note: potentially run from within an ISR. Must not block.
1614 static int sd_done(struct scsi_cmnd
*SCpnt
)
1616 int result
= SCpnt
->result
;
1617 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1618 struct scsi_sense_hdr sshdr
;
1619 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1620 struct request
*req
= SCpnt
->request
;
1621 int sense_valid
= 0;
1622 int sense_deferred
= 0;
1623 unsigned char op
= SCpnt
->cmnd
[0];
1624 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1626 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1628 good_bytes
= blk_rq_bytes(req
);
1629 scsi_set_resid(SCpnt
, 0);
1632 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1637 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1639 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1641 #ifdef CONFIG_SCSI_LOGGING
1642 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1644 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1645 "sd_done: sb[respc,sk,asc,"
1646 "ascq]=%x,%x,%x,%x\n",
1647 sshdr
.response_code
,
1648 sshdr
.sense_key
, sshdr
.asc
,
1652 if (driver_byte(result
) != DRIVER_SENSE
&&
1653 (!sense_valid
|| sense_deferred
))
1656 sdkp
->medium_access_timed_out
= 0;
1658 switch (sshdr
.sense_key
) {
1659 case HARDWARE_ERROR
:
1661 good_bytes
= sd_completed_bytes(SCpnt
);
1663 case RECOVERED_ERROR
:
1664 good_bytes
= scsi_bufflen(SCpnt
);
1667 /* This indicates a false check condition, so ignore it. An
1668 * unknown amount of data was transferred so treat it as an
1671 scsi_print_sense("sd", SCpnt
);
1673 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1675 case ABORTED_COMMAND
:
1676 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1677 good_bytes
= sd_completed_bytes(SCpnt
);
1679 case ILLEGAL_REQUEST
:
1680 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1681 good_bytes
= sd_completed_bytes(SCpnt
);
1682 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1683 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1686 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1691 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1693 sdkp
->device
->no_write_same
= 1;
1694 sd_config_write_same(sdkp
);
1697 req
->__data_len
= blk_rq_bytes(req
);
1698 req
->cmd_flags
|= REQ_QUIET
;
1707 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1708 sd_dif_complete(SCpnt
, good_bytes
);
1710 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1711 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1713 /* We have to print a failed command here as the
1714 * extended CDB gets freed before scsi_io_completion()
1718 scsi_print_command(SCpnt
);
1720 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
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
1927 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1928 unsigned char *buffer
)
1930 unsigned char cmd
[16];
1931 struct scsi_sense_hdr sshdr
;
1932 int sense_valid
= 0;
1934 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1935 unsigned int alignment
;
1936 unsigned long long lba
;
1937 unsigned sector_size
;
1939 if (sdp
->no_read_capacity_16
)
1944 cmd
[0] = SERVICE_ACTION_IN
;
1945 cmd
[1] = SAI_READ_CAPACITY_16
;
1947 memset(buffer
, 0, RC16_LEN
);
1949 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1950 buffer
, RC16_LEN
, &sshdr
,
1951 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1953 if (media_not_present(sdkp
, &sshdr
))
1957 sense_valid
= scsi_sense_valid(&sshdr
);
1959 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1960 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1962 /* Invalid Command Operation Code or
1963 * Invalid Field in CDB, just retry
1964 * silently with RC10 */
1967 sshdr
.sense_key
== UNIT_ATTENTION
&&
1968 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1969 /* Device reset might occur several times,
1970 * give it one more chance */
1971 if (--reset_retries
> 0)
1976 } while (the_result
&& retries
);
1979 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1980 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1984 sector_size
= get_unaligned_be32(&buffer
[8]);
1985 lba
= get_unaligned_be64(&buffer
[0]);
1987 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
1992 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1993 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1994 "kernel compiled with support for large block "
2000 /* Logical blocks per physical block exponent */
2001 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2003 /* Lowest aligned logical block */
2004 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2005 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2006 if (alignment
&& sdkp
->first_scan
)
2007 sd_printk(KERN_NOTICE
, sdkp
,
2008 "physical block alignment offset: %u\n", alignment
);
2010 if (buffer
[14] & 0x80) { /* LBPME */
2013 if (buffer
[14] & 0x40) /* LBPRZ */
2016 sd_config_discard(sdkp
, SD_LBP_WS16
);
2019 sdkp
->capacity
= lba
+ 1;
2023 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2024 unsigned char *buffer
)
2026 unsigned char cmd
[16];
2027 struct scsi_sense_hdr sshdr
;
2028 int sense_valid
= 0;
2030 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2032 unsigned sector_size
;
2035 cmd
[0] = READ_CAPACITY
;
2036 memset(&cmd
[1], 0, 9);
2037 memset(buffer
, 0, 8);
2039 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2041 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2043 if (media_not_present(sdkp
, &sshdr
))
2047 sense_valid
= scsi_sense_valid(&sshdr
);
2049 sshdr
.sense_key
== UNIT_ATTENTION
&&
2050 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2051 /* Device reset might occur several times,
2052 * give it one more chance */
2053 if (--reset_retries
> 0)
2058 } while (the_result
&& retries
);
2061 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
2062 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2066 sector_size
= get_unaligned_be32(&buffer
[4]);
2067 lba
= get_unaligned_be32(&buffer
[0]);
2069 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2070 /* Some buggy (usb cardreader) devices return an lba of
2071 0xffffffff when the want to report a size of 0 (with
2072 which they really mean no media is present) */
2074 sdkp
->physical_block_size
= sector_size
;
2078 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2079 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2080 "kernel compiled with support for large block "
2086 sdkp
->capacity
= lba
+ 1;
2087 sdkp
->physical_block_size
= sector_size
;
2091 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2093 if (sdp
->host
->max_cmd_len
< 16)
2095 if (sdp
->try_rc_10_first
)
2097 if (sdp
->scsi_level
> SCSI_SPC_2
)
2099 if (scsi_device_protection(sdp
))
2105 * read disk capacity
2108 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2111 struct scsi_device
*sdp
= sdkp
->device
;
2112 sector_t old_capacity
= sdkp
->capacity
;
2114 if (sd_try_rc16_first(sdp
)) {
2115 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2116 if (sector_size
== -EOVERFLOW
)
2118 if (sector_size
== -ENODEV
)
2120 if (sector_size
< 0)
2121 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2122 if (sector_size
< 0)
2125 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2126 if (sector_size
== -EOVERFLOW
)
2128 if (sector_size
< 0)
2130 if ((sizeof(sdkp
->capacity
) > 4) &&
2131 (sdkp
->capacity
> 0xffffffffULL
)) {
2132 int old_sector_size
= sector_size
;
2133 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2134 "Trying to use READ CAPACITY(16).\n");
2135 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2136 if (sector_size
< 0) {
2137 sd_printk(KERN_NOTICE
, sdkp
,
2138 "Using 0xffffffff as device size\n");
2139 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2140 sector_size
= old_sector_size
;
2146 /* Some devices are known to return the total number of blocks,
2147 * not the highest block number. Some devices have versions
2148 * which do this and others which do not. Some devices we might
2149 * suspect of doing this but we don't know for certain.
2151 * If we know the reported capacity is wrong, decrement it. If
2152 * we can only guess, then assume the number of blocks is even
2153 * (usually true but not always) and err on the side of lowering
2156 if (sdp
->fix_capacity
||
2157 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2158 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2159 "from its reported value: %llu\n",
2160 (unsigned long long) sdkp
->capacity
);
2165 if (sector_size
== 0) {
2167 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2171 if (sector_size
!= 512 &&
2172 sector_size
!= 1024 &&
2173 sector_size
!= 2048 &&
2174 sector_size
!= 4096 &&
2175 sector_size
!= 256) {
2176 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2179 * The user might want to re-format the drive with
2180 * a supported sectorsize. Once this happens, it
2181 * would be relatively trivial to set the thing up.
2182 * For this reason, we leave the thing in the table.
2186 * set a bogus sector size so the normal read/write
2187 * logic in the block layer will eventually refuse any
2188 * request on this device without tripping over power
2189 * of two sector size assumptions
2193 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2196 char cap_str_2
[10], cap_str_10
[10];
2197 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2199 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2201 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2202 sizeof(cap_str_10
));
2204 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2205 sd_printk(KERN_NOTICE
, sdkp
,
2206 "%llu %d-byte logical blocks: (%s/%s)\n",
2207 (unsigned long long)sdkp
->capacity
,
2208 sector_size
, cap_str_10
, cap_str_2
);
2210 if (sdkp
->physical_block_size
!= sector_size
)
2211 sd_printk(KERN_NOTICE
, sdkp
,
2212 "%u-byte physical blocks\n",
2213 sdkp
->physical_block_size
);
2217 sdp
->use_16_for_rw
= (sdkp
->capacity
> 0xffffffff);
2219 /* Rescale capacity to 512-byte units */
2220 if (sector_size
== 4096)
2221 sdkp
->capacity
<<= 3;
2222 else if (sector_size
== 2048)
2223 sdkp
->capacity
<<= 2;
2224 else if (sector_size
== 1024)
2225 sdkp
->capacity
<<= 1;
2226 else if (sector_size
== 256)
2227 sdkp
->capacity
>>= 1;
2229 blk_queue_physical_block_size(sdp
->request_queue
,
2230 sdkp
->physical_block_size
);
2231 sdkp
->device
->sector_size
= sector_size
;
2234 /* called with buffer of length 512 */
2236 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2237 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2238 struct scsi_sense_hdr
*sshdr
)
2240 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2241 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2246 * read write protect setting, if possible - called only in sd_revalidate_disk()
2247 * called with buffer of length SD_BUF_SIZE
2250 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2253 struct scsi_device
*sdp
= sdkp
->device
;
2254 struct scsi_mode_data data
;
2255 int old_wp
= sdkp
->write_prot
;
2257 set_disk_ro(sdkp
->disk
, 0);
2258 if (sdp
->skip_ms_page_3f
) {
2259 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2263 if (sdp
->use_192_bytes_for_3f
) {
2264 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2267 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2268 * We have to start carefully: some devices hang if we ask
2269 * for more than is available.
2271 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2274 * Second attempt: ask for page 0 When only page 0 is
2275 * implemented, a request for page 3F may return Sense Key
2276 * 5: Illegal Request, Sense Code 24: Invalid field in
2279 if (!scsi_status_is_good(res
))
2280 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2283 * Third attempt: ask 255 bytes, as we did earlier.
2285 if (!scsi_status_is_good(res
))
2286 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2290 if (!scsi_status_is_good(res
)) {
2291 sd_printk(KERN_WARNING
, sdkp
,
2292 "Test WP failed, assume Write Enabled\n");
2294 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2295 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2296 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2297 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2298 sdkp
->write_prot
? "on" : "off");
2299 sd_printk(KERN_DEBUG
, sdkp
,
2300 "Mode Sense: %02x %02x %02x %02x\n",
2301 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2307 * sd_read_cache_type - called only from sd_revalidate_disk()
2308 * called with buffer of length SD_BUF_SIZE
2311 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2314 struct scsi_device
*sdp
= sdkp
->device
;
2319 struct scsi_mode_data data
;
2320 struct scsi_sense_hdr sshdr
;
2321 int old_wce
= sdkp
->WCE
;
2322 int old_rcd
= sdkp
->RCD
;
2323 int old_dpofua
= sdkp
->DPOFUA
;
2326 if (sdkp
->cache_override
)
2330 if (sdp
->skip_ms_page_8
) {
2331 if (sdp
->type
== TYPE_RBC
)
2334 if (sdp
->skip_ms_page_3f
)
2337 if (sdp
->use_192_bytes_for_3f
)
2341 } else if (sdp
->type
== TYPE_RBC
) {
2349 /* cautiously ask */
2350 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2353 if (!scsi_status_is_good(res
))
2356 if (!data
.header_length
) {
2359 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2362 /* that went OK, now ask for the proper length */
2366 * We're only interested in the first three bytes, actually.
2367 * But the data cache page is defined for the first 20.
2371 else if (len
> SD_BUF_SIZE
) {
2372 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2373 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2376 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2380 if (len
> first_len
)
2381 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2384 if (scsi_status_is_good(res
)) {
2385 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2387 while (offset
< len
) {
2388 u8 page_code
= buffer
[offset
] & 0x3F;
2389 u8 spf
= buffer
[offset
] & 0x40;
2391 if (page_code
== 8 || page_code
== 6) {
2392 /* We're interested only in the first 3 bytes.
2394 if (len
- offset
<= 2) {
2395 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2396 "mode parameter data\n");
2399 modepage
= page_code
;
2403 /* Go to the next page */
2404 if (spf
&& len
- offset
> 3)
2405 offset
+= 4 + (buffer
[offset
+2] << 8) +
2407 else if (!spf
&& len
- offset
> 1)
2408 offset
+= 2 + buffer
[offset
+1];
2410 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2411 "mode parameter data\n");
2417 if (modepage
== 0x3F) {
2418 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page "
2421 } else if ((buffer
[offset
] & 0x3f) != modepage
) {
2422 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
2426 if (modepage
== 8) {
2427 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2428 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2430 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2434 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2435 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2436 sd_printk(KERN_NOTICE
, sdkp
,
2437 "Uses READ/WRITE(6), disabling FUA\n");
2441 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2442 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2443 sd_printk(KERN_NOTICE
, sdkp
,
2444 "Write cache: %s, read cache: %s, %s\n",
2445 sdkp
->WCE
? "enabled" : "disabled",
2446 sdkp
->RCD
? "disabled" : "enabled",
2447 sdkp
->DPOFUA
? "supports DPO and FUA"
2448 : "doesn't support DPO or FUA");
2454 if (scsi_sense_valid(&sshdr
) &&
2455 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2456 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2457 /* Invalid field in CDB */
2458 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2460 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2463 if (sdp
->wce_default_on
) {
2464 sd_printk(KERN_NOTICE
, sdkp
, "Assuming drive cache: write back\n");
2467 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2475 * The ATO bit indicates whether the DIF application tag is available
2476 * for use by the operating system.
2478 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2481 struct scsi_device
*sdp
= sdkp
->device
;
2482 struct scsi_mode_data data
;
2483 struct scsi_sense_hdr sshdr
;
2485 if (sdp
->type
!= TYPE_DISK
)
2488 if (sdkp
->protection_type
== 0)
2491 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2492 SD_MAX_RETRIES
, &data
, &sshdr
);
2494 if (!scsi_status_is_good(res
) || !data
.header_length
||
2496 sd_printk(KERN_WARNING
, sdkp
,
2497 "getting Control mode page failed, assume no ATO\n");
2499 if (scsi_sense_valid(&sshdr
))
2500 sd_print_sense_hdr(sdkp
, &sshdr
);
2505 offset
= data
.header_length
+ data
.block_descriptor_length
;
2507 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2508 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2512 if ((buffer
[offset
+ 5] & 0x80) == 0)
2521 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2522 * @disk: disk to query
2524 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2526 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2527 const int vpd_len
= 64;
2528 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2531 /* Block Limits VPD */
2532 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2535 blk_queue_io_min(sdkp
->disk
->queue
,
2536 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2537 blk_queue_io_opt(sdkp
->disk
->queue
,
2538 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2540 if (buffer
[3] == 0x3c) {
2541 unsigned int lba_count
, desc_count
;
2543 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2548 lba_count
= get_unaligned_be32(&buffer
[20]);
2549 desc_count
= get_unaligned_be32(&buffer
[24]);
2551 if (lba_count
&& desc_count
)
2552 sdkp
->max_unmap_blocks
= lba_count
;
2554 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2556 if (buffer
[32] & 0x80)
2557 sdkp
->unmap_alignment
=
2558 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2560 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2562 if (sdkp
->max_unmap_blocks
)
2563 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2565 sd_config_discard(sdkp
, SD_LBP_WS16
);
2567 } else { /* LBP VPD page tells us what to use */
2569 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2570 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2571 else if (sdkp
->lbpws
)
2572 sd_config_discard(sdkp
, SD_LBP_WS16
);
2573 else if (sdkp
->lbpws10
)
2574 sd_config_discard(sdkp
, SD_LBP_WS10
);
2576 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2585 * sd_read_block_characteristics - Query block dev. characteristics
2586 * @disk: disk to query
2588 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2590 unsigned char *buffer
;
2592 const int vpd_len
= 64;
2594 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2597 /* Block Device Characteristics VPD */
2598 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2601 rot
= get_unaligned_be16(&buffer
[4]);
2604 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2611 * sd_read_block_provisioning - Query provisioning VPD page
2612 * @disk: disk to query
2614 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2616 unsigned char *buffer
;
2617 const int vpd_len
= 8;
2619 if (sdkp
->lbpme
== 0)
2622 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2624 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2628 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2629 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2630 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2636 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2638 if (scsi_report_opcode(sdkp
->device
, buffer
, SD_BUF_SIZE
,
2643 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2646 * Although VPD inquiries can go to SCSI-2 type devices,
2647 * some USB ones crash on receiving them, and the pages
2648 * we currently ask for are for SPC-3 and beyond
2650 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2656 * sd_revalidate_disk - called the first time a new disk is seen,
2657 * performs disk spin up, read_capacity, etc.
2658 * @disk: struct gendisk we care about
2660 static int sd_revalidate_disk(struct gendisk
*disk
)
2662 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2663 struct scsi_device
*sdp
= sdkp
->device
;
2664 unsigned char *buffer
;
2667 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2668 "sd_revalidate_disk\n"));
2671 * If the device is offline, don't try and read capacity or any
2672 * of the other niceties.
2674 if (!scsi_device_online(sdp
))
2677 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2679 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2680 "allocation failure.\n");
2684 sd_spinup_disk(sdkp
);
2687 * Without media there is no reason to ask; moreover, some devices
2688 * react badly if we do.
2690 if (sdkp
->media_present
) {
2691 sd_read_capacity(sdkp
, buffer
);
2693 if (sd_try_extended_inquiry(sdp
)) {
2694 sd_read_block_provisioning(sdkp
);
2695 sd_read_block_limits(sdkp
);
2696 sd_read_block_characteristics(sdkp
);
2699 sd_read_write_protect_flag(sdkp
, buffer
);
2700 sd_read_cache_type(sdkp
, buffer
);
2701 sd_read_app_tag_own(sdkp
, buffer
);
2702 sd_read_write_same(sdkp
, buffer
);
2705 sdkp
->first_scan
= 0;
2708 * We now have all cache related info, determine how we deal
2709 * with flush requests.
2717 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2719 set_capacity(disk
, sdkp
->capacity
);
2720 sd_config_write_same(sdkp
);
2728 * sd_unlock_native_capacity - unlock native capacity
2729 * @disk: struct gendisk to set capacity for
2731 * Block layer calls this function if it detects that partitions
2732 * on @disk reach beyond the end of the device. If the SCSI host
2733 * implements ->unlock_native_capacity() method, it's invoked to
2734 * give it a chance to adjust the device capacity.
2737 * Defined by block layer. Might sleep.
2739 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2741 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2743 if (sdev
->host
->hostt
->unlock_native_capacity
)
2744 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2748 * sd_format_disk_name - format disk name
2749 * @prefix: name prefix - ie. "sd" for SCSI disks
2750 * @index: index of the disk to format name for
2751 * @buf: output buffer
2752 * @buflen: length of the output buffer
2754 * SCSI disk names starts at sda. The 26th device is sdz and the
2755 * 27th is sdaa. The last one for two lettered suffix is sdzz
2756 * which is followed by sdaaa.
2758 * This is basically 26 base counting with one extra 'nil' entry
2759 * at the beginning from the second digit on and can be
2760 * determined using similar method as 26 base conversion with the
2761 * index shifted -1 after each digit is computed.
2767 * 0 on success, -errno on failure.
2769 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2771 const int base
= 'z' - 'a' + 1;
2772 char *begin
= buf
+ strlen(prefix
);
2773 char *end
= buf
+ buflen
;
2783 *--p
= 'a' + (index
% unit
);
2784 index
= (index
/ unit
) - 1;
2785 } while (index
>= 0);
2787 memmove(begin
, p
, end
- p
);
2788 memcpy(buf
, prefix
, strlen(prefix
));
2794 * The asynchronous part of sd_probe
2796 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2798 struct scsi_disk
*sdkp
= data
;
2799 struct scsi_device
*sdp
;
2806 index
= sdkp
->index
;
2807 dev
= &sdp
->sdev_gendev
;
2809 gd
->major
= sd_major((index
& 0xf0) >> 4);
2810 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2811 gd
->minors
= SD_MINORS
;
2813 gd
->fops
= &sd_fops
;
2814 gd
->private_data
= &sdkp
->driver
;
2815 gd
->queue
= sdkp
->device
->request_queue
;
2817 /* defaults, until the device tells us otherwise */
2818 sdp
->sector_size
= 512;
2820 sdkp
->media_present
= 1;
2821 sdkp
->write_prot
= 0;
2822 sdkp
->cache_override
= 0;
2826 sdkp
->first_scan
= 1;
2827 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2829 sd_revalidate_disk(gd
);
2831 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2832 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2834 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2835 gd
->flags
= GENHD_FL_EXT_DEVT
;
2836 if (sdp
->removable
) {
2837 gd
->flags
|= GENHD_FL_REMOVABLE
;
2838 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2843 sd_dif_config_host(sdkp
);
2845 sd_revalidate_disk(gd
);
2847 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2848 sdp
->removable
? "removable " : "");
2849 blk_pm_runtime_init(sdp
->request_queue
, dev
);
2850 scsi_autopm_put_device(sdp
);
2851 put_device(&sdkp
->dev
);
2855 * sd_probe - called during driver initialization and whenever a
2856 * new scsi device is attached to the system. It is called once
2857 * for each scsi device (not just disks) present.
2858 * @dev: pointer to device object
2860 * Returns 0 if successful (or not interested in this scsi device
2861 * (e.g. scanner)); 1 when there is an error.
2863 * Note: this function is invoked from the scsi mid-level.
2864 * This function sets up the mapping between a given
2865 * <host,channel,id,lun> (found in sdp) and new device name
2866 * (e.g. /dev/sda). More precisely it is the block device major
2867 * and minor number that is chosen here.
2869 * Assume sd_probe is not re-entrant (for time being)
2870 * Also think about sd_probe() and sd_remove() running coincidentally.
2872 static int sd_probe(struct device
*dev
)
2874 struct scsi_device
*sdp
= to_scsi_device(dev
);
2875 struct scsi_disk
*sdkp
;
2881 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2884 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2888 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2892 gd
= alloc_disk(SD_MINORS
);
2897 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2900 spin_lock(&sd_index_lock
);
2901 error
= ida_get_new(&sd_index_ida
, &index
);
2902 spin_unlock(&sd_index_lock
);
2903 } while (error
== -EAGAIN
);
2906 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2910 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2912 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2913 goto out_free_index
;
2917 sdkp
->driver
= &sd_template
;
2919 sdkp
->index
= index
;
2920 atomic_set(&sdkp
->openers
, 0);
2921 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2923 if (!sdp
->request_queue
->rq_timeout
) {
2924 if (sdp
->type
!= TYPE_MOD
)
2925 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2927 blk_queue_rq_timeout(sdp
->request_queue
,
2931 device_initialize(&sdkp
->dev
);
2932 sdkp
->dev
.parent
= dev
;
2933 sdkp
->dev
.class = &sd_disk_class
;
2934 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
2936 if (device_add(&sdkp
->dev
))
2937 goto out_free_index
;
2940 dev_set_drvdata(dev
, sdkp
);
2942 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2943 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2948 spin_lock(&sd_index_lock
);
2949 ida_remove(&sd_index_ida
, index
);
2950 spin_unlock(&sd_index_lock
);
2960 * sd_remove - called whenever a scsi disk (previously recognized by
2961 * sd_probe) is detached from the system. It is called (potentially
2962 * multiple times) during sd module unload.
2963 * @sdp: pointer to mid level scsi device object
2965 * Note: this function is invoked from the scsi mid-level.
2966 * This function potentially frees up a device name (e.g. /dev/sdc)
2967 * that could be re-used by a subsequent sd_probe().
2968 * This function is not called when the built-in sd driver is "exit-ed".
2970 static int sd_remove(struct device
*dev
)
2972 struct scsi_disk
*sdkp
;
2974 sdkp
= dev_get_drvdata(dev
);
2975 scsi_autopm_get_device(sdkp
->device
);
2977 async_synchronize_full_domain(&scsi_sd_probe_domain
);
2978 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2979 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2980 device_del(&sdkp
->dev
);
2981 del_gendisk(sdkp
->disk
);
2984 mutex_lock(&sd_ref_mutex
);
2985 dev_set_drvdata(dev
, NULL
);
2986 put_device(&sdkp
->dev
);
2987 mutex_unlock(&sd_ref_mutex
);
2993 * scsi_disk_release - Called to free the scsi_disk structure
2994 * @dev: pointer to embedded class device
2996 * sd_ref_mutex must be held entering this routine. Because it is
2997 * called on last put, you should always use the scsi_disk_get()
2998 * scsi_disk_put() helpers which manipulate the semaphore directly
2999 * and never do a direct put_device.
3001 static void scsi_disk_release(struct device
*dev
)
3003 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3004 struct gendisk
*disk
= sdkp
->disk
;
3006 spin_lock(&sd_index_lock
);
3007 ida_remove(&sd_index_ida
, sdkp
->index
);
3008 spin_unlock(&sd_index_lock
);
3010 disk
->private_data
= NULL
;
3012 put_device(&sdkp
->device
->sdev_gendev
);
3017 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3019 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3020 struct scsi_sense_hdr sshdr
;
3021 struct scsi_device
*sdp
= sdkp
->device
;
3025 cmd
[4] |= 1; /* START */
3027 if (sdp
->start_stop_pwr_cond
)
3028 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3030 if (!scsi_device_online(sdp
))
3033 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3034 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, REQ_PM
);
3036 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
3037 sd_print_result(sdkp
, res
);
3038 if (driver_byte(res
) & DRIVER_SENSE
)
3039 sd_print_sense_hdr(sdkp
, &sshdr
);
3046 * Send a SYNCHRONIZE CACHE instruction down to the device through
3047 * the normal SCSI command structure. Wait for the command to
3050 static void sd_shutdown(struct device
*dev
)
3052 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3055 return; /* this can happen */
3057 if (pm_runtime_suspended(dev
))
3061 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3062 sd_sync_cache(sdkp
);
3065 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3066 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3067 sd_start_stop_device(sdkp
, 0);
3071 scsi_disk_put(sdkp
);
3074 static int sd_suspend(struct device
*dev
)
3076 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3080 return 0; /* this can happen */
3083 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3084 ret
= sd_sync_cache(sdkp
);
3089 if (sdkp
->device
->manage_start_stop
) {
3090 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3091 ret
= sd_start_stop_device(sdkp
, 0);
3095 scsi_disk_put(sdkp
);
3099 static int sd_resume(struct device
*dev
)
3101 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3104 if (!sdkp
->device
->manage_start_stop
)
3107 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3108 ret
= sd_start_stop_device(sdkp
, 1);
3111 scsi_disk_put(sdkp
);
3116 * init_sd - entry point for this driver (both when built in or when
3119 * Note: this function registers this driver with the scsi mid-level.
3121 static int __init
init_sd(void)
3123 int majors
= 0, i
, err
;
3125 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3127 for (i
= 0; i
< SD_MAJORS
; i
++)
3128 if (register_blkdev(sd_major(i
), "sd") == 0)
3134 err
= class_register(&sd_disk_class
);
3138 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3140 if (!sd_cdb_cache
) {
3141 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3145 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3147 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3151 err
= scsi_register_driver(&sd_template
.gendrv
);
3153 goto err_out_driver
;
3158 mempool_destroy(sd_cdb_pool
);
3161 kmem_cache_destroy(sd_cdb_cache
);
3164 class_unregister(&sd_disk_class
);
3166 for (i
= 0; i
< SD_MAJORS
; i
++)
3167 unregister_blkdev(sd_major(i
), "sd");
3172 * exit_sd - exit point for this driver (when it is a module).
3174 * Note: this function unregisters this driver from the scsi mid-level.
3176 static void __exit
exit_sd(void)
3180 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3182 scsi_unregister_driver(&sd_template
.gendrv
);
3183 mempool_destroy(sd_cdb_pool
);
3184 kmem_cache_destroy(sd_cdb_cache
);
3186 class_unregister(&sd_disk_class
);
3188 for (i
= 0; i
< SD_MAJORS
; i
++)
3189 unregister_blkdev(sd_major(i
), "sd");
3192 module_init(init_sd
);
3193 module_exit(exit_sd
);
3195 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3196 struct scsi_sense_hdr
*sshdr
)
3198 sd_printk(KERN_INFO
, sdkp
, " ");
3199 scsi_show_sense_hdr(sshdr
);
3200 sd_printk(KERN_INFO
, sdkp
, " ");
3201 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3204 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3206 sd_printk(KERN_INFO
, sdkp
, " ");
3207 scsi_show_result(result
);