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_system(struct device
*);
109 static int sd_suspend_runtime(struct device
*);
110 static int sd_resume(struct device
*);
111 static void sd_rescan(struct device
*);
112 static int sd_done(struct scsi_cmnd
*);
113 static int sd_eh_action(struct scsi_cmnd
*, unsigned char *, int, int);
114 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
115 static void scsi_disk_release(struct device
*cdev
);
116 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
117 static void sd_print_result(struct scsi_disk
*, int);
119 static DEFINE_SPINLOCK(sd_index_lock
);
120 static DEFINE_IDA(sd_index_ida
);
122 /* This semaphore is used to mediate the 0->1 reference get in the
123 * face of object destruction (i.e. we can't allow a get on an
124 * object after last put) */
125 static DEFINE_MUTEX(sd_ref_mutex
);
127 static struct kmem_cache
*sd_cdb_cache
;
128 static mempool_t
*sd_cdb_pool
;
130 static const char *sd_cache_types
[] = {
131 "write through", "none", "write back",
132 "write back, no read (daft)"
136 cache_type_store(struct device
*dev
, struct device_attribute
*attr
,
137 const char *buf
, size_t count
)
139 int i
, ct
= -1, rcd
, wce
, sp
;
140 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
141 struct scsi_device
*sdp
= sdkp
->device
;
144 struct scsi_mode_data data
;
145 struct scsi_sense_hdr sshdr
;
146 static const char temp
[] = "temporary ";
149 if (sdp
->type
!= TYPE_DISK
)
150 /* no cache control on RBC devices; theoretically they
151 * can do it, but there's probably so many exceptions
152 * it's not worth the risk */
155 if (strncmp(buf
, temp
, sizeof(temp
) - 1) == 0) {
156 buf
+= sizeof(temp
) - 1;
157 sdkp
->cache_override
= 1;
159 sdkp
->cache_override
= 0;
162 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
163 len
= strlen(sd_cache_types
[i
]);
164 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
172 rcd
= ct
& 0x01 ? 1 : 0;
173 wce
= ct
& 0x02 ? 1 : 0;
175 if (sdkp
->cache_override
) {
181 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
182 SD_MAX_RETRIES
, &data
, NULL
))
184 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
185 data
.block_descriptor_length
);
186 buffer_data
= buffer
+ data
.header_length
+
187 data
.block_descriptor_length
;
188 buffer_data
[2] &= ~0x05;
189 buffer_data
[2] |= wce
<< 2 | rcd
;
190 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
192 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
193 SD_MAX_RETRIES
, &data
, &sshdr
)) {
194 if (scsi_sense_valid(&sshdr
))
195 sd_print_sense_hdr(sdkp
, &sshdr
);
198 revalidate_disk(sdkp
->disk
);
203 manage_start_stop_show(struct device
*dev
, struct device_attribute
*attr
,
206 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
207 struct scsi_device
*sdp
= sdkp
->device
;
209 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
213 manage_start_stop_store(struct device
*dev
, struct device_attribute
*attr
,
214 const char *buf
, size_t count
)
216 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
217 struct scsi_device
*sdp
= sdkp
->device
;
219 if (!capable(CAP_SYS_ADMIN
))
222 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
226 static DEVICE_ATTR_RW(manage_start_stop
);
229 allow_restart_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
231 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
233 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
237 allow_restart_store(struct device
*dev
, struct device_attribute
*attr
,
238 const char *buf
, size_t count
)
240 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
241 struct scsi_device
*sdp
= sdkp
->device
;
243 if (!capable(CAP_SYS_ADMIN
))
246 if (sdp
->type
!= TYPE_DISK
)
249 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
253 static DEVICE_ATTR_RW(allow_restart
);
256 cache_type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
258 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
259 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
261 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
263 static DEVICE_ATTR_RW(cache_type
);
266 FUA_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
268 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
270 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
272 static DEVICE_ATTR_RO(FUA
);
275 protection_type_show(struct device
*dev
, struct device_attribute
*attr
,
278 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
280 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
284 protection_type_store(struct device
*dev
, struct device_attribute
*attr
,
285 const char *buf
, size_t count
)
287 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
291 if (!capable(CAP_SYS_ADMIN
))
294 err
= kstrtouint(buf
, 10, &val
);
299 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
300 sdkp
->protection_type
= val
;
304 static DEVICE_ATTR_RW(protection_type
);
307 protection_mode_show(struct device
*dev
, struct device_attribute
*attr
,
310 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
311 struct scsi_device
*sdp
= sdkp
->device
;
312 unsigned int dif
, dix
;
314 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
315 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
317 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
323 return snprintf(buf
, 20, "none\n");
325 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
327 static DEVICE_ATTR_RO(protection_mode
);
330 app_tag_own_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
332 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
334 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
336 static DEVICE_ATTR_RO(app_tag_own
);
339 thin_provisioning_show(struct device
*dev
, struct device_attribute
*attr
,
342 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
344 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
346 static DEVICE_ATTR_RO(thin_provisioning
);
348 static const char *lbp_mode
[] = {
349 [SD_LBP_FULL
] = "full",
350 [SD_LBP_UNMAP
] = "unmap",
351 [SD_LBP_WS16
] = "writesame_16",
352 [SD_LBP_WS10
] = "writesame_10",
353 [SD_LBP_ZERO
] = "writesame_zero",
354 [SD_LBP_DISABLE
] = "disabled",
358 provisioning_mode_show(struct device
*dev
, struct device_attribute
*attr
,
361 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
363 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
367 provisioning_mode_store(struct device
*dev
, struct device_attribute
*attr
,
368 const char *buf
, size_t count
)
370 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
371 struct scsi_device
*sdp
= sdkp
->device
;
373 if (!capable(CAP_SYS_ADMIN
))
376 if (sdp
->type
!= TYPE_DISK
)
379 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
380 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
381 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
382 sd_config_discard(sdkp
, SD_LBP_WS16
);
383 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
384 sd_config_discard(sdkp
, SD_LBP_WS10
);
385 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
386 sd_config_discard(sdkp
, SD_LBP_ZERO
);
387 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
388 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
394 static DEVICE_ATTR_RW(provisioning_mode
);
397 max_medium_access_timeouts_show(struct device
*dev
,
398 struct device_attribute
*attr
, char *buf
)
400 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
402 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
406 max_medium_access_timeouts_store(struct device
*dev
,
407 struct device_attribute
*attr
, const char *buf
,
410 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
413 if (!capable(CAP_SYS_ADMIN
))
416 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
418 return err
? err
: count
;
420 static DEVICE_ATTR_RW(max_medium_access_timeouts
);
423 max_write_same_blocks_show(struct device
*dev
, struct device_attribute
*attr
,
426 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
428 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
432 max_write_same_blocks_store(struct device
*dev
, struct device_attribute
*attr
,
433 const char *buf
, size_t count
)
435 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
436 struct scsi_device
*sdp
= sdkp
->device
;
440 if (!capable(CAP_SYS_ADMIN
))
443 if (sdp
->type
!= TYPE_DISK
)
446 err
= kstrtoul(buf
, 10, &max
);
452 sdp
->no_write_same
= 1;
453 else if (max
<= SD_MAX_WS16_BLOCKS
) {
454 sdp
->no_write_same
= 0;
455 sdkp
->max_ws_blocks
= max
;
458 sd_config_write_same(sdkp
);
462 static DEVICE_ATTR_RW(max_write_same_blocks
);
464 static struct attribute
*sd_disk_attrs
[] = {
465 &dev_attr_cache_type
.attr
,
467 &dev_attr_allow_restart
.attr
,
468 &dev_attr_manage_start_stop
.attr
,
469 &dev_attr_protection_type
.attr
,
470 &dev_attr_protection_mode
.attr
,
471 &dev_attr_app_tag_own
.attr
,
472 &dev_attr_thin_provisioning
.attr
,
473 &dev_attr_provisioning_mode
.attr
,
474 &dev_attr_max_write_same_blocks
.attr
,
475 &dev_attr_max_medium_access_timeouts
.attr
,
478 ATTRIBUTE_GROUPS(sd_disk
);
480 static struct class sd_disk_class
= {
482 .owner
= THIS_MODULE
,
483 .dev_release
= scsi_disk_release
,
484 .dev_groups
= sd_disk_groups
,
487 static const struct dev_pm_ops sd_pm_ops
= {
488 .suspend
= sd_suspend_system
,
490 .poweroff
= sd_suspend_system
,
491 .restore
= sd_resume
,
492 .runtime_suspend
= sd_suspend_runtime
,
493 .runtime_resume
= sd_resume
,
496 static struct scsi_driver sd_template
= {
497 .owner
= THIS_MODULE
,
502 .shutdown
= sd_shutdown
,
507 .eh_action
= sd_eh_action
,
511 * Dummy kobj_map->probe function.
512 * The default ->probe function will call modprobe, which is
513 * pointless as this module is already loaded.
515 static struct kobject
*sd_default_probe(dev_t devt
, int *partno
, void *data
)
521 * Device no to disk mapping:
523 * major disc2 disc p1
524 * |............|.............|....|....| <- dev_t
527 * Inside a major, we have 16k disks, however mapped non-
528 * contiguously. The first 16 disks are for major0, the next
529 * ones with major1, ... Disk 256 is for major0 again, disk 272
531 * As we stay compatible with our numbering scheme, we can reuse
532 * the well-know SCSI majors 8, 65--71, 136--143.
534 static int sd_major(int major_idx
)
538 return SCSI_DISK0_MAJOR
;
540 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
542 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
545 return 0; /* shut up gcc */
549 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
551 struct scsi_disk
*sdkp
= NULL
;
553 if (disk
->private_data
) {
554 sdkp
= scsi_disk(disk
);
555 if (scsi_device_get(sdkp
->device
) == 0)
556 get_device(&sdkp
->dev
);
563 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
565 struct scsi_disk
*sdkp
;
567 mutex_lock(&sd_ref_mutex
);
568 sdkp
= __scsi_disk_get(disk
);
569 mutex_unlock(&sd_ref_mutex
);
573 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
575 struct scsi_disk
*sdkp
;
577 mutex_lock(&sd_ref_mutex
);
578 sdkp
= dev_get_drvdata(dev
);
580 sdkp
= __scsi_disk_get(sdkp
->disk
);
581 mutex_unlock(&sd_ref_mutex
);
585 static void scsi_disk_put(struct scsi_disk
*sdkp
)
587 struct scsi_device
*sdev
= sdkp
->device
;
589 mutex_lock(&sd_ref_mutex
);
590 put_device(&sdkp
->dev
);
591 scsi_device_put(sdev
);
592 mutex_unlock(&sd_ref_mutex
);
595 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
597 unsigned int prot_op
= SCSI_PROT_NORMAL
;
598 unsigned int dix
= scsi_prot_sg_count(scmd
);
600 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
602 prot_op
= SCSI_PROT_READ_PASS
;
603 else if (dif
&& !dix
)
604 prot_op
= SCSI_PROT_READ_STRIP
;
605 else if (!dif
&& dix
)
606 prot_op
= SCSI_PROT_READ_INSERT
;
609 prot_op
= SCSI_PROT_WRITE_PASS
;
610 else if (dif
&& !dix
)
611 prot_op
= SCSI_PROT_WRITE_INSERT
;
612 else if (!dif
&& dix
)
613 prot_op
= SCSI_PROT_WRITE_STRIP
;
616 scsi_set_prot_op(scmd
, prot_op
);
617 scsi_set_prot_type(scmd
, dif
);
620 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
622 struct request_queue
*q
= sdkp
->disk
->queue
;
623 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
624 unsigned int max_blocks
= 0;
626 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
627 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
629 q
->limits
.discard_granularity
=
630 max(sdkp
->physical_block_size
,
631 sdkp
->unmap_granularity
* logical_block_size
);
633 sdkp
->provisioning_mode
= mode
;
638 q
->limits
.max_discard_sectors
= 0;
639 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
643 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
644 (u32
)SD_MAX_WS16_BLOCKS
);
648 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
649 (u32
)SD_MAX_WS16_BLOCKS
);
653 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
654 (u32
)SD_MAX_WS10_BLOCKS
);
658 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
659 (u32
)SD_MAX_WS10_BLOCKS
);
660 q
->limits
.discard_zeroes_data
= 1;
664 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
665 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
669 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
670 * @sdp: scsi device to operate one
671 * @rq: Request to prepare
673 * Will issue either UNMAP or WRITE SAME(16) depending on preference
674 * indicated by target device.
676 static int sd_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
678 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
679 sector_t sector
= blk_rq_pos(rq
);
680 unsigned int nr_sectors
= blk_rq_sectors(rq
);
681 unsigned int nr_bytes
= blk_rq_bytes(rq
);
687 sector
>>= ilog2(sdp
->sector_size
) - 9;
688 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
689 rq
->timeout
= SD_TIMEOUT
;
691 memset(rq
->cmd
, 0, rq
->cmd_len
);
693 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
695 return BLKPREP_DEFER
;
697 switch (sdkp
->provisioning_mode
) {
699 buf
= page_address(page
);
705 put_unaligned_be16(6 + 16, &buf
[0]);
706 put_unaligned_be16(16, &buf
[2]);
707 put_unaligned_be64(sector
, &buf
[8]);
708 put_unaligned_be32(nr_sectors
, &buf
[16]);
715 rq
->cmd
[0] = WRITE_SAME_16
;
716 rq
->cmd
[1] = 0x8; /* UNMAP */
717 put_unaligned_be64(sector
, &rq
->cmd
[2]);
718 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
720 len
= sdkp
->device
->sector_size
;
726 rq
->cmd
[0] = WRITE_SAME
;
727 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
728 rq
->cmd
[1] = 0x8; /* UNMAP */
729 put_unaligned_be32(sector
, &rq
->cmd
[2]);
730 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
732 len
= sdkp
->device
->sector_size
;
740 blk_add_request_payload(rq
, page
, len
);
741 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
742 rq
->buffer
= page_address(page
);
743 rq
->__data_len
= nr_bytes
;
746 if (ret
!= BLKPREP_OK
) {
753 static void sd_config_write_same(struct scsi_disk
*sdkp
)
755 struct request_queue
*q
= sdkp
->disk
->queue
;
756 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
758 if (sdkp
->device
->no_write_same
) {
759 sdkp
->max_ws_blocks
= 0;
763 /* Some devices can not handle block counts above 0xffff despite
764 * supporting WRITE SAME(16). Consequently we default to 64k
765 * blocks per I/O unless the device explicitly advertises a
768 if (sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
769 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
770 (u32
)SD_MAX_WS16_BLOCKS
);
771 else if (sdkp
->ws16
|| sdkp
->ws10
|| sdkp
->device
->no_report_opcodes
)
772 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
773 (u32
)SD_MAX_WS10_BLOCKS
);
775 sdkp
->device
->no_write_same
= 1;
776 sdkp
->max_ws_blocks
= 0;
780 blk_queue_max_write_same_sectors(q
, sdkp
->max_ws_blocks
*
781 (logical_block_size
>> 9));
785 * sd_setup_write_same_cmnd - write the same data to multiple blocks
786 * @sdp: scsi device to operate one
787 * @rq: Request to prepare
789 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
790 * preference indicated by target device.
792 static int sd_setup_write_same_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
794 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
795 struct bio
*bio
= rq
->bio
;
796 sector_t sector
= blk_rq_pos(rq
);
797 unsigned int nr_sectors
= blk_rq_sectors(rq
);
798 unsigned int nr_bytes
= blk_rq_bytes(rq
);
801 if (sdkp
->device
->no_write_same
)
804 BUG_ON(bio_offset(bio
) || bio_iovec(bio
)->bv_len
!= sdp
->sector_size
);
806 sector
>>= ilog2(sdp
->sector_size
) - 9;
807 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
809 rq
->__data_len
= sdp
->sector_size
;
810 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
811 memset(rq
->cmd
, 0, rq
->cmd_len
);
813 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
815 rq
->cmd
[0] = WRITE_SAME_16
;
816 put_unaligned_be64(sector
, &rq
->cmd
[2]);
817 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
820 rq
->cmd
[0] = WRITE_SAME
;
821 put_unaligned_be32(sector
, &rq
->cmd
[2]);
822 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
825 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
826 rq
->__data_len
= nr_bytes
;
831 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
833 rq
->timeout
*= SD_FLUSH_TIMEOUT_MULTIPLIER
;
834 rq
->retries
= SD_MAX_RETRIES
;
835 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
838 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
841 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
843 struct scsi_cmnd
*SCpnt
= rq
->special
;
845 if (rq
->cmd_flags
& REQ_DISCARD
) {
846 free_page((unsigned long)rq
->buffer
);
849 if (SCpnt
->cmnd
!= rq
->cmd
) {
850 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
857 * sd_prep_fn - build a scsi (read or write) command from
858 * information in the request structure.
859 * @SCpnt: pointer to mid-level's per scsi command structure that
860 * contains request and into which the scsi command is written
862 * Returns 1 if successful and 0 if error (or cannot be done now).
864 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
866 struct scsi_cmnd
*SCpnt
;
867 struct scsi_device
*sdp
= q
->queuedata
;
868 struct gendisk
*disk
= rq
->rq_disk
;
869 struct scsi_disk
*sdkp
;
870 sector_t block
= blk_rq_pos(rq
);
872 unsigned int this_count
= blk_rq_sectors(rq
);
874 unsigned char protect
;
877 * Discard request come in as REQ_TYPE_FS but we turn them into
878 * block PC requests to make life easier.
880 if (rq
->cmd_flags
& REQ_DISCARD
) {
881 ret
= sd_setup_discard_cmnd(sdp
, rq
);
883 } else if (rq
->cmd_flags
& REQ_WRITE_SAME
) {
884 ret
= sd_setup_write_same_cmnd(sdp
, rq
);
886 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
887 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
889 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
890 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
892 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
896 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
897 if (ret
!= BLKPREP_OK
)
900 sdkp
= scsi_disk(disk
);
902 /* from here on until we're complete, any goto out
903 * is used for a killable error condition */
906 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
907 "sd_prep_fn: block=%llu, "
909 (unsigned long long)block
,
912 if (!sdp
|| !scsi_device_online(sdp
) ||
913 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
914 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
915 "Finishing %u sectors\n",
916 blk_rq_sectors(rq
)));
917 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
918 "Retry with 0x%p\n", SCpnt
));
924 * quietly refuse to do anything to a changed disc until
925 * the changed bit has been reset
927 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
932 * Some SD card readers can't handle multi-sector accesses which touch
933 * the last one or two hardware sectors. Split accesses as needed.
935 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
936 (sdp
->sector_size
/ 512);
938 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
939 if (block
< threshold
) {
940 /* Access up to the threshold but not beyond */
941 this_count
= threshold
- block
;
943 /* Access only a single hardware sector */
944 this_count
= sdp
->sector_size
/ 512;
948 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
949 (unsigned long long)block
));
952 * If we have a 1K hardware sectorsize, prevent access to single
953 * 512 byte sectors. In theory we could handle this - in fact
954 * the scsi cdrom driver must be able to handle this because
955 * we typically use 1K blocksizes, and cdroms typically have
956 * 2K hardware sectorsizes. Of course, things are simpler
957 * with the cdrom, since it is read-only. For performance
958 * reasons, the filesystems should be able to handle this
959 * and not force the scsi disk driver to use bounce buffers
962 if (sdp
->sector_size
== 1024) {
963 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
964 scmd_printk(KERN_ERR
, SCpnt
,
965 "Bad block number requested\n");
969 this_count
= this_count
>> 1;
972 if (sdp
->sector_size
== 2048) {
973 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
974 scmd_printk(KERN_ERR
, SCpnt
,
975 "Bad block number requested\n");
979 this_count
= this_count
>> 2;
982 if (sdp
->sector_size
== 4096) {
983 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
984 scmd_printk(KERN_ERR
, SCpnt
,
985 "Bad block number requested\n");
989 this_count
= this_count
>> 3;
992 if (rq_data_dir(rq
) == WRITE
) {
993 if (!sdp
->writeable
) {
996 SCpnt
->cmnd
[0] = WRITE_6
;
997 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
999 if (blk_integrity_rq(rq
))
1000 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
1002 } else if (rq_data_dir(rq
) == READ
) {
1003 SCpnt
->cmnd
[0] = READ_6
;
1004 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
1006 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %llx\n", (unsigned long long) rq
->cmd_flags
);
1010 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
1011 "%s %d/%u 512 byte blocks.\n",
1012 (rq_data_dir(rq
) == WRITE
) ?
1013 "writing" : "reading", this_count
,
1014 blk_rq_sectors(rq
)));
1016 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1017 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
1023 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
1024 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1026 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1027 ret
= BLKPREP_DEFER
;
1031 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1032 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1033 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1034 SCpnt
->cmnd
[7] = 0x18;
1035 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1036 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1039 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1040 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1041 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1042 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1043 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1044 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1045 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1046 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1048 /* Expected Indirect LBA */
1049 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1050 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1051 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1052 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1054 /* Transfer length */
1055 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1056 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1057 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1058 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1059 } else if (sdp
->use_16_for_rw
) {
1060 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1061 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1062 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1063 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1064 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1065 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1066 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1067 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1068 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1069 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1070 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1071 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1072 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1073 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1074 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1075 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1076 scsi_device_protection(SCpnt
->device
) ||
1077 SCpnt
->device
->use_10_for_rw
) {
1078 if (this_count
> 0xffff)
1079 this_count
= 0xffff;
1081 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1082 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1083 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1084 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1085 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1086 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1087 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1088 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1089 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1091 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1093 * This happens only if this drive failed
1094 * 10byte rw command with ILLEGAL_REQUEST
1095 * during operation and thus turned off
1098 scmd_printk(KERN_ERR
, SCpnt
,
1099 "FUA write on READ/WRITE(6) drive\n");
1103 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1104 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1105 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1106 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1109 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1111 /* If DIF or DIX is enabled, tell HBA how to handle request */
1112 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
1113 sd_prot_op(SCpnt
, host_dif
);
1116 * We shouldn't disconnect in the middle of a sector, so with a dumb
1117 * host adapter, it's safe to assume that we can at least transfer
1118 * this many bytes between each connect / disconnect.
1120 SCpnt
->transfersize
= sdp
->sector_size
;
1121 SCpnt
->underflow
= this_count
<< 9;
1122 SCpnt
->allowed
= SD_MAX_RETRIES
;
1125 * This indicates that the command is ready from our end to be
1130 return scsi_prep_return(q
, rq
, ret
);
1134 * sd_open - open a scsi disk device
1135 * @inode: only i_rdev member may be used
1136 * @filp: only f_mode and f_flags may be used
1138 * Returns 0 if successful. Returns a negated errno value in case
1141 * Note: This can be called from a user context (e.g. fsck(1) )
1142 * or from within the kernel (e.g. as a result of a mount(1) ).
1143 * In the latter case @inode and @filp carry an abridged amount
1144 * of information as noted above.
1146 * Locking: called with bdev->bd_mutex held.
1148 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1150 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1151 struct scsi_device
*sdev
;
1157 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1159 sdev
= sdkp
->device
;
1162 * If the device is in error recovery, wait until it is done.
1163 * If the device is offline, then disallow any access to it.
1166 if (!scsi_block_when_processing_errors(sdev
))
1169 if (sdev
->removable
|| sdkp
->write_prot
)
1170 check_disk_change(bdev
);
1173 * If the drive is empty, just let the open fail.
1175 retval
= -ENOMEDIUM
;
1176 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1180 * If the device has the write protect tab set, have the open fail
1181 * if the user expects to be able to write to the thing.
1184 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1188 * It is possible that the disk changing stuff resulted in
1189 * the device being taken offline. If this is the case,
1190 * report this to the user, and don't pretend that the
1191 * open actually succeeded.
1194 if (!scsi_device_online(sdev
))
1197 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1198 if (scsi_block_when_processing_errors(sdev
))
1199 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1205 scsi_disk_put(sdkp
);
1210 * sd_release - invoked when the (last) close(2) is called on this
1212 * @inode: only i_rdev member may be used
1213 * @filp: only f_mode and f_flags may be used
1217 * Note: may block (uninterruptible) if error recovery is underway
1220 * Locking: called with bdev->bd_mutex held.
1222 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1224 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1225 struct scsi_device
*sdev
= sdkp
->device
;
1227 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1229 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1230 if (scsi_block_when_processing_errors(sdev
))
1231 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1235 * XXX and what if there are packets in flight and this close()
1236 * XXX is followed by a "rmmod sd_mod"?
1239 scsi_disk_put(sdkp
);
1242 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1244 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1245 struct scsi_device
*sdp
= sdkp
->device
;
1246 struct Scsi_Host
*host
= sdp
->host
;
1249 /* default to most commonly used values */
1250 diskinfo
[0] = 0x40; /* 1 << 6 */
1251 diskinfo
[1] = 0x20; /* 1 << 5 */
1252 diskinfo
[2] = sdkp
->capacity
>> 11;
1254 /* override with calculated, extended default, or driver values */
1255 if (host
->hostt
->bios_param
)
1256 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1258 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1260 geo
->heads
= diskinfo
[0];
1261 geo
->sectors
= diskinfo
[1];
1262 geo
->cylinders
= diskinfo
[2];
1267 * sd_ioctl - process an ioctl
1268 * @inode: only i_rdev/i_bdev members may be used
1269 * @filp: only f_mode and f_flags may be used
1270 * @cmd: ioctl command number
1271 * @arg: this is third argument given to ioctl(2) system call.
1272 * Often contains a pointer.
1274 * Returns 0 if successful (some ioctls return positive numbers on
1275 * success as well). Returns a negated errno value in case of error.
1277 * Note: most ioctls are forward onto the block subsystem or further
1278 * down in the scsi subsystem.
1280 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1281 unsigned int cmd
, unsigned long arg
)
1283 struct gendisk
*disk
= bdev
->bd_disk
;
1284 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1285 struct scsi_device
*sdp
= sdkp
->device
;
1286 void __user
*p
= (void __user
*)arg
;
1289 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1290 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1292 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1297 * If we are in the middle of error recovery, don't let anyone
1298 * else try and use this device. Also, if error recovery fails, it
1299 * may try and take the device offline, in which case all further
1300 * access to the device is prohibited.
1302 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1303 (mode
& FMODE_NDELAY
) != 0);
1304 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1308 * Send SCSI addressing ioctls directly to mid level, send other
1309 * ioctls to block level and then onto mid level if they can't be
1313 case SCSI_IOCTL_GET_IDLUN
:
1314 case SCSI_IOCTL_GET_BUS_NUMBER
:
1315 error
= scsi_ioctl(sdp
, cmd
, p
);
1318 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1319 if (error
!= -ENOTTY
)
1321 error
= scsi_ioctl(sdp
, cmd
, p
);
1328 static void set_media_not_present(struct scsi_disk
*sdkp
)
1330 if (sdkp
->media_present
)
1331 sdkp
->device
->changed
= 1;
1333 if (sdkp
->device
->removable
) {
1334 sdkp
->media_present
= 0;
1339 static int media_not_present(struct scsi_disk
*sdkp
,
1340 struct scsi_sense_hdr
*sshdr
)
1342 if (!scsi_sense_valid(sshdr
))
1345 /* not invoked for commands that could return deferred errors */
1346 switch (sshdr
->sense_key
) {
1347 case UNIT_ATTENTION
:
1349 /* medium not present */
1350 if (sshdr
->asc
== 0x3A) {
1351 set_media_not_present(sdkp
);
1359 * sd_check_events - check media events
1360 * @disk: kernel device descriptor
1361 * @clearing: disk events currently being cleared
1363 * Returns mask of DISK_EVENT_*.
1365 * Note: this function is invoked from the block subsystem.
1367 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1369 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1370 struct scsi_device
*sdp
= sdkp
->device
;
1371 struct scsi_sense_hdr
*sshdr
= NULL
;
1374 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1377 * If the device is offline, don't send any commands - just pretend as
1378 * if the command failed. If the device ever comes back online, we
1379 * can deal with it then. It is only because of unrecoverable errors
1380 * that we would ever take a device offline in the first place.
1382 if (!scsi_device_online(sdp
)) {
1383 set_media_not_present(sdkp
);
1388 * Using TEST_UNIT_READY enables differentiation between drive with
1389 * no cartridge loaded - NOT READY, drive with changed cartridge -
1390 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1392 * Drives that auto spin down. eg iomega jaz 1G, will be started
1393 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1394 * sd_revalidate() is called.
1398 if (scsi_block_when_processing_errors(sdp
)) {
1399 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1400 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1404 /* failed to execute TUR, assume media not present */
1405 if (host_byte(retval
)) {
1406 set_media_not_present(sdkp
);
1410 if (media_not_present(sdkp
, sshdr
))
1414 * For removable scsi disk we have to recognise the presence
1415 * of a disk in the drive.
1417 if (!sdkp
->media_present
)
1419 sdkp
->media_present
= 1;
1422 * sdp->changed is set under the following conditions:
1424 * Medium present state has changed in either direction.
1425 * Device has indicated UNIT_ATTENTION.
1428 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1433 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1436 struct scsi_device
*sdp
= sdkp
->device
;
1437 const int timeout
= sdp
->request_queue
->rq_timeout
1438 * SD_FLUSH_TIMEOUT_MULTIPLIER
;
1439 struct scsi_sense_hdr sshdr
;
1441 if (!scsi_device_online(sdp
))
1444 for (retries
= 3; retries
> 0; --retries
) {
1445 unsigned char cmd
[10] = { 0 };
1447 cmd
[0] = SYNCHRONIZE_CACHE
;
1449 * Leave the rest of the command zero to indicate
1452 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1453 &sshdr
, timeout
, SD_MAX_RETRIES
,
1460 sd_print_result(sdkp
, res
);
1462 if (driver_byte(res
) & DRIVER_SENSE
)
1463 sd_print_sense_hdr(sdkp
, &sshdr
);
1464 /* we need to evaluate the error return */
1465 if (scsi_sense_valid(&sshdr
) &&
1466 /* 0x3a is medium not present */
1468 /* this is no error here */
1471 switch (host_byte(res
)) {
1472 /* ignore errors due to racing a disconnection */
1473 case DID_BAD_TARGET
:
1474 case DID_NO_CONNECT
:
1476 /* signal the upper layer it might try again */
1480 case DID_SOFT_ERROR
:
1489 static void sd_rescan(struct device
*dev
)
1491 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1494 revalidate_disk(sdkp
->disk
);
1495 scsi_disk_put(sdkp
);
1500 #ifdef CONFIG_COMPAT
1502 * This gets directly called from VFS. When the ioctl
1503 * is not recognized we go back to the other translation paths.
1505 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1506 unsigned int cmd
, unsigned long arg
)
1508 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1511 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1516 * If we are in the middle of error recovery, don't let anyone
1517 * else try and use this device. Also, if error recovery fails, it
1518 * may try and take the device offline, in which case all further
1519 * access to the device is prohibited.
1521 if (!scsi_block_when_processing_errors(sdev
))
1524 if (sdev
->host
->hostt
->compat_ioctl
) {
1525 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1531 * Let the static ioctl translation table take care of it.
1533 return -ENOIOCTLCMD
;
1537 static const struct block_device_operations sd_fops
= {
1538 .owner
= THIS_MODULE
,
1540 .release
= sd_release
,
1542 .getgeo
= sd_getgeo
,
1543 #ifdef CONFIG_COMPAT
1544 .compat_ioctl
= sd_compat_ioctl
,
1546 .check_events
= sd_check_events
,
1547 .revalidate_disk
= sd_revalidate_disk
,
1548 .unlock_native_capacity
= sd_unlock_native_capacity
,
1552 * sd_eh_action - error handling callback
1553 * @scmd: sd-issued command that has failed
1554 * @eh_cmnd: The command that was sent during error handling
1555 * @eh_cmnd_len: Length of eh_cmnd in bytes
1556 * @eh_disp: The recovery disposition suggested by the midlayer
1558 * This function is called by the SCSI midlayer upon completion of
1559 * an error handling command (TEST UNIT READY, START STOP UNIT,
1560 * etc.) The command sent to the device by the error handler is
1561 * stored in eh_cmnd. The result of sending the eh command is
1562 * passed in eh_disp.
1564 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1565 int eh_cmnd_len
, int eh_disp
)
1567 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1569 if (!scsi_device_online(scmd
->device
) ||
1570 !scsi_medium_access_command(scmd
))
1574 * The device has timed out executing a medium access command.
1575 * However, the TEST UNIT READY command sent during error
1576 * handling completed successfully. Either the device is in the
1577 * process of recovering or has it suffered an internal failure
1578 * that prevents access to the storage medium.
1580 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1581 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1582 sdkp
->medium_access_timed_out
++;
1585 * If the device keeps failing read/write commands but TEST UNIT
1586 * READY always completes successfully we assume that medium
1587 * access is no longer possible and take the device offline.
1589 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1590 scmd_printk(KERN_ERR
, scmd
,
1591 "Medium access timeout failure. Offlining disk!\n");
1592 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1600 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1602 u64 start_lba
= blk_rq_pos(scmd
->request
);
1603 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1607 * resid is optional but mostly filled in. When it's unused,
1608 * its value is zero, so we assume the whole buffer transferred
1610 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1611 unsigned int good_bytes
;
1613 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1616 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1617 SCSI_SENSE_BUFFERSIZE
,
1622 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1625 if (scmd
->device
->sector_size
< 512) {
1626 /* only legitimate sector_size here is 256 */
1630 /* be careful ... don't want any overflows */
1631 u64 factor
= scmd
->device
->sector_size
/ 512;
1632 do_div(start_lba
, factor
);
1633 do_div(end_lba
, factor
);
1636 /* The bad lba was reported incorrectly, we have no idea where
1639 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1642 /* This computation should always be done in terms of
1643 * the resolution of the device's medium.
1645 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1646 return min(good_bytes
, transferred
);
1650 * sd_done - bottom half handler: called when the lower level
1651 * driver has completed (successfully or otherwise) a scsi command.
1652 * @SCpnt: mid-level's per command structure.
1654 * Note: potentially run from within an ISR. Must not block.
1656 static int sd_done(struct scsi_cmnd
*SCpnt
)
1658 int result
= SCpnt
->result
;
1659 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1660 struct scsi_sense_hdr sshdr
;
1661 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1662 struct request
*req
= SCpnt
->request
;
1663 int sense_valid
= 0;
1664 int sense_deferred
= 0;
1665 unsigned char op
= SCpnt
->cmnd
[0];
1666 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1668 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1670 good_bytes
= blk_rq_bytes(req
);
1671 scsi_set_resid(SCpnt
, 0);
1674 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1679 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1681 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1683 #ifdef CONFIG_SCSI_LOGGING
1684 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1686 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1687 "sd_done: sb[respc,sk,asc,"
1688 "ascq]=%x,%x,%x,%x\n",
1689 sshdr
.response_code
,
1690 sshdr
.sense_key
, sshdr
.asc
,
1694 if (driver_byte(result
) != DRIVER_SENSE
&&
1695 (!sense_valid
|| sense_deferred
))
1698 sdkp
->medium_access_timed_out
= 0;
1700 switch (sshdr
.sense_key
) {
1701 case HARDWARE_ERROR
:
1703 good_bytes
= sd_completed_bytes(SCpnt
);
1705 case RECOVERED_ERROR
:
1706 good_bytes
= scsi_bufflen(SCpnt
);
1709 /* This indicates a false check condition, so ignore it. An
1710 * unknown amount of data was transferred so treat it as an
1713 scsi_print_sense("sd", SCpnt
);
1715 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1717 case ABORTED_COMMAND
:
1718 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1719 good_bytes
= sd_completed_bytes(SCpnt
);
1721 case ILLEGAL_REQUEST
:
1722 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1723 good_bytes
= sd_completed_bytes(SCpnt
);
1724 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1725 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1728 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1733 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1735 sdkp
->device
->no_write_same
= 1;
1736 sd_config_write_same(sdkp
);
1739 req
->__data_len
= blk_rq_bytes(req
);
1740 req
->cmd_flags
|= REQ_QUIET
;
1749 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1750 sd_dif_complete(SCpnt
, good_bytes
);
1756 * spinup disk - called only in sd_revalidate_disk()
1759 sd_spinup_disk(struct scsi_disk
*sdkp
)
1761 unsigned char cmd
[10];
1762 unsigned long spintime_expire
= 0;
1763 int retries
, spintime
;
1764 unsigned int the_result
;
1765 struct scsi_sense_hdr sshdr
;
1766 int sense_valid
= 0;
1770 /* Spin up drives, as required. Only do this at boot time */
1771 /* Spinup needs to be done for module loads too. */
1776 cmd
[0] = TEST_UNIT_READY
;
1777 memset((void *) &cmd
[1], 0, 9);
1779 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1782 SD_MAX_RETRIES
, NULL
);
1785 * If the drive has indicated to us that it
1786 * doesn't have any media in it, don't bother
1787 * with any more polling.
1789 if (media_not_present(sdkp
, &sshdr
))
1793 sense_valid
= scsi_sense_valid(&sshdr
);
1795 } while (retries
< 3 &&
1796 (!scsi_status_is_good(the_result
) ||
1797 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1798 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1800 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1801 /* no sense, TUR either succeeded or failed
1802 * with a status error */
1803 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1804 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1805 sd_print_result(sdkp
, the_result
);
1811 * The device does not want the automatic start to be issued.
1813 if (sdkp
->device
->no_start_on_add
)
1816 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1817 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1818 break; /* manual intervention required */
1819 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1820 break; /* standby */
1821 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1822 break; /* unavailable */
1824 * Issue command to spin up drive when not ready
1827 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1828 cmd
[0] = START_STOP
;
1829 cmd
[1] = 1; /* Return immediately */
1830 memset((void *) &cmd
[2], 0, 8);
1831 cmd
[4] = 1; /* Start spin cycle */
1832 if (sdkp
->device
->start_stop_pwr_cond
)
1834 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1836 SD_TIMEOUT
, SD_MAX_RETRIES
,
1838 spintime_expire
= jiffies
+ 100 * HZ
;
1841 /* Wait 1 second for next try */
1846 * Wait for USB flash devices with slow firmware.
1847 * Yes, this sense key/ASC combination shouldn't
1848 * occur here. It's characteristic of these devices.
1850 } else if (sense_valid
&&
1851 sshdr
.sense_key
== UNIT_ATTENTION
&&
1852 sshdr
.asc
== 0x28) {
1854 spintime_expire
= jiffies
+ 5 * HZ
;
1857 /* Wait 1 second for next try */
1860 /* we don't understand the sense code, so it's
1861 * probably pointless to loop */
1863 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1864 sd_print_sense_hdr(sdkp
, &sshdr
);
1869 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1872 if (scsi_status_is_good(the_result
))
1875 printk("not responding...\n");
1881 * Determine whether disk supports Data Integrity Field.
1883 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1885 struct scsi_device
*sdp
= sdkp
->device
;
1889 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1892 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1894 if (type
> SD_DIF_TYPE3_PROTECTION
)
1896 else if (scsi_host_dif_capable(sdp
->host
, type
))
1899 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1902 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1903 " protection type %u. Disabling disk!\n",
1907 sd_printk(KERN_NOTICE
, sdkp
,
1908 "Enabling DIF Type %u protection\n", type
);
1911 sd_printk(KERN_NOTICE
, sdkp
,
1912 "Disabling DIF Type %u protection\n", type
);
1916 sdkp
->protection_type
= type
;
1921 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1922 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1925 sd_print_result(sdkp
, the_result
);
1926 if (driver_byte(the_result
) & DRIVER_SENSE
)
1927 sd_print_sense_hdr(sdkp
, sshdr
);
1929 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1932 * Set dirty bit for removable devices if not ready -
1933 * sometimes drives will not report this properly.
1935 if (sdp
->removable
&&
1936 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1937 set_media_not_present(sdkp
);
1940 * We used to set media_present to 0 here to indicate no media
1941 * in the drive, but some drives fail read capacity even with
1942 * media present, so we can't do that.
1944 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1948 #if RC16_LEN > SD_BUF_SIZE
1949 #error RC16_LEN must not be more than SD_BUF_SIZE
1952 #define READ_CAPACITY_RETRIES_ON_RESET 10
1954 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1955 unsigned char *buffer
)
1957 unsigned char cmd
[16];
1958 struct scsi_sense_hdr sshdr
;
1959 int sense_valid
= 0;
1961 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1962 unsigned int alignment
;
1963 unsigned long long lba
;
1964 unsigned sector_size
;
1966 if (sdp
->no_read_capacity_16
)
1971 cmd
[0] = SERVICE_ACTION_IN
;
1972 cmd
[1] = SAI_READ_CAPACITY_16
;
1974 memset(buffer
, 0, RC16_LEN
);
1976 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1977 buffer
, RC16_LEN
, &sshdr
,
1978 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1980 if (media_not_present(sdkp
, &sshdr
))
1984 sense_valid
= scsi_sense_valid(&sshdr
);
1986 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1987 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1989 /* Invalid Command Operation Code or
1990 * Invalid Field in CDB, just retry
1991 * silently with RC10 */
1994 sshdr
.sense_key
== UNIT_ATTENTION
&&
1995 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1996 /* Device reset might occur several times,
1997 * give it one more chance */
1998 if (--reset_retries
> 0)
2003 } while (the_result
&& retries
);
2006 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
2007 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2011 sector_size
= get_unaligned_be32(&buffer
[8]);
2012 lba
= get_unaligned_be64(&buffer
[0]);
2014 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
2019 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
2020 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2021 "kernel compiled with support for large block "
2027 /* Logical blocks per physical block exponent */
2028 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2030 /* Lowest aligned logical block */
2031 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2032 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2033 if (alignment
&& sdkp
->first_scan
)
2034 sd_printk(KERN_NOTICE
, sdkp
,
2035 "physical block alignment offset: %u\n", alignment
);
2037 if (buffer
[14] & 0x80) { /* LBPME */
2040 if (buffer
[14] & 0x40) /* LBPRZ */
2043 sd_config_discard(sdkp
, SD_LBP_WS16
);
2046 sdkp
->capacity
= lba
+ 1;
2050 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2051 unsigned char *buffer
)
2053 unsigned char cmd
[16];
2054 struct scsi_sense_hdr sshdr
;
2055 int sense_valid
= 0;
2057 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2059 unsigned sector_size
;
2062 cmd
[0] = READ_CAPACITY
;
2063 memset(&cmd
[1], 0, 9);
2064 memset(buffer
, 0, 8);
2066 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2068 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2070 if (media_not_present(sdkp
, &sshdr
))
2074 sense_valid
= scsi_sense_valid(&sshdr
);
2076 sshdr
.sense_key
== UNIT_ATTENTION
&&
2077 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2078 /* Device reset might occur several times,
2079 * give it one more chance */
2080 if (--reset_retries
> 0)
2085 } while (the_result
&& retries
);
2088 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
2089 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2093 sector_size
= get_unaligned_be32(&buffer
[4]);
2094 lba
= get_unaligned_be32(&buffer
[0]);
2096 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2097 /* Some buggy (usb cardreader) devices return an lba of
2098 0xffffffff when the want to report a size of 0 (with
2099 which they really mean no media is present) */
2101 sdkp
->physical_block_size
= sector_size
;
2105 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2106 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2107 "kernel compiled with support for large block "
2113 sdkp
->capacity
= lba
+ 1;
2114 sdkp
->physical_block_size
= sector_size
;
2118 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2120 if (sdp
->host
->max_cmd_len
< 16)
2122 if (sdp
->try_rc_10_first
)
2124 if (sdp
->scsi_level
> SCSI_SPC_2
)
2126 if (scsi_device_protection(sdp
))
2132 * read disk capacity
2135 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2138 struct scsi_device
*sdp
= sdkp
->device
;
2139 sector_t old_capacity
= sdkp
->capacity
;
2141 if (sd_try_rc16_first(sdp
)) {
2142 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2143 if (sector_size
== -EOVERFLOW
)
2145 if (sector_size
== -ENODEV
)
2147 if (sector_size
< 0)
2148 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2149 if (sector_size
< 0)
2152 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2153 if (sector_size
== -EOVERFLOW
)
2155 if (sector_size
< 0)
2157 if ((sizeof(sdkp
->capacity
) > 4) &&
2158 (sdkp
->capacity
> 0xffffffffULL
)) {
2159 int old_sector_size
= sector_size
;
2160 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2161 "Trying to use READ CAPACITY(16).\n");
2162 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2163 if (sector_size
< 0) {
2164 sd_printk(KERN_NOTICE
, sdkp
,
2165 "Using 0xffffffff as device size\n");
2166 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2167 sector_size
= old_sector_size
;
2173 /* Some devices are known to return the total number of blocks,
2174 * not the highest block number. Some devices have versions
2175 * which do this and others which do not. Some devices we might
2176 * suspect of doing this but we don't know for certain.
2178 * If we know the reported capacity is wrong, decrement it. If
2179 * we can only guess, then assume the number of blocks is even
2180 * (usually true but not always) and err on the side of lowering
2183 if (sdp
->fix_capacity
||
2184 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2185 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2186 "from its reported value: %llu\n",
2187 (unsigned long long) sdkp
->capacity
);
2192 if (sector_size
== 0) {
2194 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2198 if (sector_size
!= 512 &&
2199 sector_size
!= 1024 &&
2200 sector_size
!= 2048 &&
2201 sector_size
!= 4096 &&
2202 sector_size
!= 256) {
2203 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2206 * The user might want to re-format the drive with
2207 * a supported sectorsize. Once this happens, it
2208 * would be relatively trivial to set the thing up.
2209 * For this reason, we leave the thing in the table.
2213 * set a bogus sector size so the normal read/write
2214 * logic in the block layer will eventually refuse any
2215 * request on this device without tripping over power
2216 * of two sector size assumptions
2220 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2223 char cap_str_2
[10], cap_str_10
[10];
2224 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2226 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2228 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2229 sizeof(cap_str_10
));
2231 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2232 sd_printk(KERN_NOTICE
, sdkp
,
2233 "%llu %d-byte logical blocks: (%s/%s)\n",
2234 (unsigned long long)sdkp
->capacity
,
2235 sector_size
, cap_str_10
, cap_str_2
);
2237 if (sdkp
->physical_block_size
!= sector_size
)
2238 sd_printk(KERN_NOTICE
, sdkp
,
2239 "%u-byte physical blocks\n",
2240 sdkp
->physical_block_size
);
2244 sdp
->use_16_for_rw
= (sdkp
->capacity
> 0xffffffff);
2246 /* Rescale capacity to 512-byte units */
2247 if (sector_size
== 4096)
2248 sdkp
->capacity
<<= 3;
2249 else if (sector_size
== 2048)
2250 sdkp
->capacity
<<= 2;
2251 else if (sector_size
== 1024)
2252 sdkp
->capacity
<<= 1;
2253 else if (sector_size
== 256)
2254 sdkp
->capacity
>>= 1;
2256 blk_queue_physical_block_size(sdp
->request_queue
,
2257 sdkp
->physical_block_size
);
2258 sdkp
->device
->sector_size
= sector_size
;
2261 /* called with buffer of length 512 */
2263 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2264 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2265 struct scsi_sense_hdr
*sshdr
)
2267 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2268 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2273 * read write protect setting, if possible - called only in sd_revalidate_disk()
2274 * called with buffer of length SD_BUF_SIZE
2277 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2280 struct scsi_device
*sdp
= sdkp
->device
;
2281 struct scsi_mode_data data
;
2282 int old_wp
= sdkp
->write_prot
;
2284 set_disk_ro(sdkp
->disk
, 0);
2285 if (sdp
->skip_ms_page_3f
) {
2286 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2290 if (sdp
->use_192_bytes_for_3f
) {
2291 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2294 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2295 * We have to start carefully: some devices hang if we ask
2296 * for more than is available.
2298 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2301 * Second attempt: ask for page 0 When only page 0 is
2302 * implemented, a request for page 3F may return Sense Key
2303 * 5: Illegal Request, Sense Code 24: Invalid field in
2306 if (!scsi_status_is_good(res
))
2307 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2310 * Third attempt: ask 255 bytes, as we did earlier.
2312 if (!scsi_status_is_good(res
))
2313 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2317 if (!scsi_status_is_good(res
)) {
2318 sd_printk(KERN_WARNING
, sdkp
,
2319 "Test WP failed, assume Write Enabled\n");
2321 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2322 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2323 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2324 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2325 sdkp
->write_prot
? "on" : "off");
2326 sd_printk(KERN_DEBUG
, sdkp
,
2327 "Mode Sense: %02x %02x %02x %02x\n",
2328 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2334 * sd_read_cache_type - called only from sd_revalidate_disk()
2335 * called with buffer of length SD_BUF_SIZE
2338 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2341 struct scsi_device
*sdp
= sdkp
->device
;
2346 struct scsi_mode_data data
;
2347 struct scsi_sense_hdr sshdr
;
2348 int old_wce
= sdkp
->WCE
;
2349 int old_rcd
= sdkp
->RCD
;
2350 int old_dpofua
= sdkp
->DPOFUA
;
2353 if (sdkp
->cache_override
)
2357 if (sdp
->skip_ms_page_8
) {
2358 if (sdp
->type
== TYPE_RBC
)
2361 if (sdp
->skip_ms_page_3f
)
2364 if (sdp
->use_192_bytes_for_3f
)
2368 } else if (sdp
->type
== TYPE_RBC
) {
2376 /* cautiously ask */
2377 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2380 if (!scsi_status_is_good(res
))
2383 if (!data
.header_length
) {
2386 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2389 /* that went OK, now ask for the proper length */
2393 * We're only interested in the first three bytes, actually.
2394 * But the data cache page is defined for the first 20.
2398 else if (len
> SD_BUF_SIZE
) {
2399 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2400 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2403 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2407 if (len
> first_len
)
2408 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2411 if (scsi_status_is_good(res
)) {
2412 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2414 while (offset
< len
) {
2415 u8 page_code
= buffer
[offset
] & 0x3F;
2416 u8 spf
= buffer
[offset
] & 0x40;
2418 if (page_code
== 8 || page_code
== 6) {
2419 /* We're interested only in the first 3 bytes.
2421 if (len
- offset
<= 2) {
2422 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2423 "mode parameter data\n");
2426 modepage
= page_code
;
2430 /* Go to the next page */
2431 if (spf
&& len
- offset
> 3)
2432 offset
+= 4 + (buffer
[offset
+2] << 8) +
2434 else if (!spf
&& len
- offset
> 1)
2435 offset
+= 2 + buffer
[offset
+1];
2437 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2438 "mode parameter data\n");
2444 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2448 if (modepage
== 8) {
2449 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2450 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2452 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2456 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2457 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2458 sd_printk(KERN_NOTICE
, sdkp
,
2459 "Uses READ/WRITE(6), disabling FUA\n");
2463 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2464 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2465 sd_printk(KERN_NOTICE
, sdkp
,
2466 "Write cache: %s, read cache: %s, %s\n",
2467 sdkp
->WCE
? "enabled" : "disabled",
2468 sdkp
->RCD
? "disabled" : "enabled",
2469 sdkp
->DPOFUA
? "supports DPO and FUA"
2470 : "doesn't support DPO or FUA");
2476 if (scsi_sense_valid(&sshdr
) &&
2477 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2478 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2479 /* Invalid field in CDB */
2480 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2482 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2485 if (sdp
->wce_default_on
) {
2486 sd_printk(KERN_NOTICE
, sdkp
, "Assuming drive cache: write back\n");
2489 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2497 * The ATO bit indicates whether the DIF application tag is available
2498 * for use by the operating system.
2500 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2503 struct scsi_device
*sdp
= sdkp
->device
;
2504 struct scsi_mode_data data
;
2505 struct scsi_sense_hdr sshdr
;
2507 if (sdp
->type
!= TYPE_DISK
)
2510 if (sdkp
->protection_type
== 0)
2513 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2514 SD_MAX_RETRIES
, &data
, &sshdr
);
2516 if (!scsi_status_is_good(res
) || !data
.header_length
||
2518 sd_printk(KERN_WARNING
, sdkp
,
2519 "getting Control mode page failed, assume no ATO\n");
2521 if (scsi_sense_valid(&sshdr
))
2522 sd_print_sense_hdr(sdkp
, &sshdr
);
2527 offset
= data
.header_length
+ data
.block_descriptor_length
;
2529 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2530 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2534 if ((buffer
[offset
+ 5] & 0x80) == 0)
2543 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2544 * @disk: disk to query
2546 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2548 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2549 const int vpd_len
= 64;
2550 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2553 /* Block Limits VPD */
2554 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2557 blk_queue_io_min(sdkp
->disk
->queue
,
2558 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2559 blk_queue_io_opt(sdkp
->disk
->queue
,
2560 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2562 if (buffer
[3] == 0x3c) {
2563 unsigned int lba_count
, desc_count
;
2565 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2570 lba_count
= get_unaligned_be32(&buffer
[20]);
2571 desc_count
= get_unaligned_be32(&buffer
[24]);
2573 if (lba_count
&& desc_count
)
2574 sdkp
->max_unmap_blocks
= lba_count
;
2576 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2578 if (buffer
[32] & 0x80)
2579 sdkp
->unmap_alignment
=
2580 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2582 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2584 if (sdkp
->max_unmap_blocks
)
2585 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2587 sd_config_discard(sdkp
, SD_LBP_WS16
);
2589 } else { /* LBP VPD page tells us what to use */
2591 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2592 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2593 else if (sdkp
->lbpws
)
2594 sd_config_discard(sdkp
, SD_LBP_WS16
);
2595 else if (sdkp
->lbpws10
)
2596 sd_config_discard(sdkp
, SD_LBP_WS10
);
2598 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2607 * sd_read_block_characteristics - Query block dev. characteristics
2608 * @disk: disk to query
2610 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2612 unsigned char *buffer
;
2614 const int vpd_len
= 64;
2616 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2619 /* Block Device Characteristics VPD */
2620 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2623 rot
= get_unaligned_be16(&buffer
[4]);
2626 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2633 * sd_read_block_provisioning - Query provisioning VPD page
2634 * @disk: disk to query
2636 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2638 unsigned char *buffer
;
2639 const int vpd_len
= 8;
2641 if (sdkp
->lbpme
== 0)
2644 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2646 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2650 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2651 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2652 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2658 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2660 struct scsi_device
*sdev
= sdkp
->device
;
2662 if (sdev
->host
->no_write_same
) {
2663 sdev
->no_write_same
= 1;
2668 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2669 /* too large values might cause issues with arcmsr */
2670 int vpd_buf_len
= 64;
2672 sdev
->no_report_opcodes
= 1;
2674 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2675 * CODES is unsupported and the device has an ATA
2676 * Information VPD page (SAT).
2678 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2679 sdev
->no_write_same
= 1;
2682 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2685 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2689 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2692 * Although VPD inquiries can go to SCSI-2 type devices,
2693 * some USB ones crash on receiving them, and the pages
2694 * we currently ask for are for SPC-3 and beyond
2696 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2702 * sd_revalidate_disk - called the first time a new disk is seen,
2703 * performs disk spin up, read_capacity, etc.
2704 * @disk: struct gendisk we care about
2706 static int sd_revalidate_disk(struct gendisk
*disk
)
2708 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2709 struct scsi_device
*sdp
= sdkp
->device
;
2710 unsigned char *buffer
;
2713 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2714 "sd_revalidate_disk\n"));
2717 * If the device is offline, don't try and read capacity or any
2718 * of the other niceties.
2720 if (!scsi_device_online(sdp
))
2723 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2725 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2726 "allocation failure.\n");
2730 sd_spinup_disk(sdkp
);
2733 * Without media there is no reason to ask; moreover, some devices
2734 * react badly if we do.
2736 if (sdkp
->media_present
) {
2737 sd_read_capacity(sdkp
, buffer
);
2739 if (sd_try_extended_inquiry(sdp
)) {
2740 sd_read_block_provisioning(sdkp
);
2741 sd_read_block_limits(sdkp
);
2742 sd_read_block_characteristics(sdkp
);
2745 sd_read_write_protect_flag(sdkp
, buffer
);
2746 sd_read_cache_type(sdkp
, buffer
);
2747 sd_read_app_tag_own(sdkp
, buffer
);
2748 sd_read_write_same(sdkp
, buffer
);
2751 sdkp
->first_scan
= 0;
2754 * We now have all cache related info, determine how we deal
2755 * with flush requests.
2763 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2765 set_capacity(disk
, sdkp
->capacity
);
2766 sd_config_write_same(sdkp
);
2774 * sd_unlock_native_capacity - unlock native capacity
2775 * @disk: struct gendisk to set capacity for
2777 * Block layer calls this function if it detects that partitions
2778 * on @disk reach beyond the end of the device. If the SCSI host
2779 * implements ->unlock_native_capacity() method, it's invoked to
2780 * give it a chance to adjust the device capacity.
2783 * Defined by block layer. Might sleep.
2785 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2787 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2789 if (sdev
->host
->hostt
->unlock_native_capacity
)
2790 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2794 * sd_format_disk_name - format disk name
2795 * @prefix: name prefix - ie. "sd" for SCSI disks
2796 * @index: index of the disk to format name for
2797 * @buf: output buffer
2798 * @buflen: length of the output buffer
2800 * SCSI disk names starts at sda. The 26th device is sdz and the
2801 * 27th is sdaa. The last one for two lettered suffix is sdzz
2802 * which is followed by sdaaa.
2804 * This is basically 26 base counting with one extra 'nil' entry
2805 * at the beginning from the second digit on and can be
2806 * determined using similar method as 26 base conversion with the
2807 * index shifted -1 after each digit is computed.
2813 * 0 on success, -errno on failure.
2815 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2817 const int base
= 'z' - 'a' + 1;
2818 char *begin
= buf
+ strlen(prefix
);
2819 char *end
= buf
+ buflen
;
2829 *--p
= 'a' + (index
% unit
);
2830 index
= (index
/ unit
) - 1;
2831 } while (index
>= 0);
2833 memmove(begin
, p
, end
- p
);
2834 memcpy(buf
, prefix
, strlen(prefix
));
2840 * The asynchronous part of sd_probe
2842 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2844 struct scsi_disk
*sdkp
= data
;
2845 struct scsi_device
*sdp
;
2852 index
= sdkp
->index
;
2853 dev
= &sdp
->sdev_gendev
;
2855 gd
->major
= sd_major((index
& 0xf0) >> 4);
2856 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2857 gd
->minors
= SD_MINORS
;
2859 gd
->fops
= &sd_fops
;
2860 gd
->private_data
= &sdkp
->driver
;
2861 gd
->queue
= sdkp
->device
->request_queue
;
2863 /* defaults, until the device tells us otherwise */
2864 sdp
->sector_size
= 512;
2866 sdkp
->media_present
= 1;
2867 sdkp
->write_prot
= 0;
2868 sdkp
->cache_override
= 0;
2872 sdkp
->first_scan
= 1;
2873 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2875 sd_revalidate_disk(gd
);
2877 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2878 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2880 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2881 gd
->flags
= GENHD_FL_EXT_DEVT
;
2882 if (sdp
->removable
) {
2883 gd
->flags
|= GENHD_FL_REMOVABLE
;
2884 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2887 blk_pm_runtime_init(sdp
->request_queue
, dev
);
2890 sd_dif_config_host(sdkp
);
2892 sd_revalidate_disk(gd
);
2894 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2895 sdp
->removable
? "removable " : "");
2896 scsi_autopm_put_device(sdp
);
2897 put_device(&sdkp
->dev
);
2901 * sd_probe - called during driver initialization and whenever a
2902 * new scsi device is attached to the system. It is called once
2903 * for each scsi device (not just disks) present.
2904 * @dev: pointer to device object
2906 * Returns 0 if successful (or not interested in this scsi device
2907 * (e.g. scanner)); 1 when there is an error.
2909 * Note: this function is invoked from the scsi mid-level.
2910 * This function sets up the mapping between a given
2911 * <host,channel,id,lun> (found in sdp) and new device name
2912 * (e.g. /dev/sda). More precisely it is the block device major
2913 * and minor number that is chosen here.
2915 * Assume sd_probe is not re-entrant (for time being)
2916 * Also think about sd_probe() and sd_remove() running coincidentally.
2918 static int sd_probe(struct device
*dev
)
2920 struct scsi_device
*sdp
= to_scsi_device(dev
);
2921 struct scsi_disk
*sdkp
;
2927 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2930 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2934 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2938 gd
= alloc_disk(SD_MINORS
);
2943 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2946 spin_lock(&sd_index_lock
);
2947 error
= ida_get_new(&sd_index_ida
, &index
);
2948 spin_unlock(&sd_index_lock
);
2949 } while (error
== -EAGAIN
);
2952 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2956 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2958 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2959 goto out_free_index
;
2963 sdkp
->driver
= &sd_template
;
2965 sdkp
->index
= index
;
2966 atomic_set(&sdkp
->openers
, 0);
2967 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2969 if (!sdp
->request_queue
->rq_timeout
) {
2970 if (sdp
->type
!= TYPE_MOD
)
2971 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2973 blk_queue_rq_timeout(sdp
->request_queue
,
2977 device_initialize(&sdkp
->dev
);
2978 sdkp
->dev
.parent
= dev
;
2979 sdkp
->dev
.class = &sd_disk_class
;
2980 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
2982 if (device_add(&sdkp
->dev
))
2983 goto out_free_index
;
2986 dev_set_drvdata(dev
, sdkp
);
2988 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2989 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2994 spin_lock(&sd_index_lock
);
2995 ida_remove(&sd_index_ida
, index
);
2996 spin_unlock(&sd_index_lock
);
3006 * sd_remove - called whenever a scsi disk (previously recognized by
3007 * sd_probe) is detached from the system. It is called (potentially
3008 * multiple times) during sd module unload.
3009 * @sdp: pointer to mid level scsi device object
3011 * Note: this function is invoked from the scsi mid-level.
3012 * This function potentially frees up a device name (e.g. /dev/sdc)
3013 * that could be re-used by a subsequent sd_probe().
3014 * This function is not called when the built-in sd driver is "exit-ed".
3016 static int sd_remove(struct device
*dev
)
3018 struct scsi_disk
*sdkp
;
3021 sdkp
= dev_get_drvdata(dev
);
3022 devt
= disk_devt(sdkp
->disk
);
3023 scsi_autopm_get_device(sdkp
->device
);
3025 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3026 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
3027 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
3028 device_del(&sdkp
->dev
);
3029 del_gendisk(sdkp
->disk
);
3032 blk_register_region(devt
, SD_MINORS
, NULL
,
3033 sd_default_probe
, NULL
, NULL
);
3035 mutex_lock(&sd_ref_mutex
);
3036 dev_set_drvdata(dev
, NULL
);
3037 put_device(&sdkp
->dev
);
3038 mutex_unlock(&sd_ref_mutex
);
3044 * scsi_disk_release - Called to free the scsi_disk structure
3045 * @dev: pointer to embedded class device
3047 * sd_ref_mutex must be held entering this routine. Because it is
3048 * called on last put, you should always use the scsi_disk_get()
3049 * scsi_disk_put() helpers which manipulate the semaphore directly
3050 * and never do a direct put_device.
3052 static void scsi_disk_release(struct device
*dev
)
3054 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3055 struct gendisk
*disk
= sdkp
->disk
;
3057 spin_lock(&sd_index_lock
);
3058 ida_remove(&sd_index_ida
, sdkp
->index
);
3059 spin_unlock(&sd_index_lock
);
3061 disk
->private_data
= NULL
;
3063 put_device(&sdkp
->device
->sdev_gendev
);
3068 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3070 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3071 struct scsi_sense_hdr sshdr
;
3072 struct scsi_device
*sdp
= sdkp
->device
;
3076 cmd
[4] |= 1; /* START */
3078 if (sdp
->start_stop_pwr_cond
)
3079 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3081 if (!scsi_device_online(sdp
))
3084 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3085 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, REQ_PM
);
3087 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
3088 sd_print_result(sdkp
, res
);
3089 if (driver_byte(res
) & DRIVER_SENSE
)
3090 sd_print_sense_hdr(sdkp
, &sshdr
);
3091 if (scsi_sense_valid(&sshdr
) &&
3092 /* 0x3a is medium not present */
3097 /* SCSI error codes must not go to the generic layer */
3105 * Send a SYNCHRONIZE CACHE instruction down to the device through
3106 * the normal SCSI command structure. Wait for the command to
3109 static void sd_shutdown(struct device
*dev
)
3111 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3114 return; /* this can happen */
3116 if (pm_runtime_suspended(dev
))
3119 if (sdkp
->WCE
&& sdkp
->media_present
) {
3120 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3121 sd_sync_cache(sdkp
);
3124 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3125 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3126 sd_start_stop_device(sdkp
, 0);
3130 scsi_disk_put(sdkp
);
3133 static int sd_suspend_common(struct device
*dev
, bool ignore_stop_errors
)
3135 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3139 return 0; /* this can happen */
3141 if (sdkp
->WCE
&& sdkp
->media_present
) {
3142 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3143 ret
= sd_sync_cache(sdkp
);
3145 /* ignore OFFLINE device */
3152 if (sdkp
->device
->manage_start_stop
) {
3153 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3154 /* an error is not worth aborting a system sleep */
3155 ret
= sd_start_stop_device(sdkp
, 0);
3156 if (ignore_stop_errors
)
3161 scsi_disk_put(sdkp
);
3165 static int sd_suspend_system(struct device
*dev
)
3167 return sd_suspend_common(dev
, true);
3170 static int sd_suspend_runtime(struct device
*dev
)
3172 return sd_suspend_common(dev
, false);
3175 static int sd_resume(struct device
*dev
)
3177 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3180 if (!sdkp
->device
->manage_start_stop
)
3183 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3184 ret
= sd_start_stop_device(sdkp
, 1);
3187 scsi_disk_put(sdkp
);
3192 * init_sd - entry point for this driver (both when built in or when
3195 * Note: this function registers this driver with the scsi mid-level.
3197 static int __init
init_sd(void)
3199 int majors
= 0, i
, err
;
3201 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3203 for (i
= 0; i
< SD_MAJORS
; i
++) {
3204 if (register_blkdev(sd_major(i
), "sd") != 0)
3207 blk_register_region(sd_major(i
), SD_MINORS
, NULL
,
3208 sd_default_probe
, NULL
, NULL
);
3214 err
= class_register(&sd_disk_class
);
3218 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3220 if (!sd_cdb_cache
) {
3221 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3225 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3227 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3231 err
= scsi_register_driver(&sd_template
.gendrv
);
3233 goto err_out_driver
;
3238 mempool_destroy(sd_cdb_pool
);
3241 kmem_cache_destroy(sd_cdb_cache
);
3244 class_unregister(&sd_disk_class
);
3246 for (i
= 0; i
< SD_MAJORS
; i
++)
3247 unregister_blkdev(sd_major(i
), "sd");
3252 * exit_sd - exit point for this driver (when it is a module).
3254 * Note: this function unregisters this driver from the scsi mid-level.
3256 static void __exit
exit_sd(void)
3260 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3262 scsi_unregister_driver(&sd_template
.gendrv
);
3263 mempool_destroy(sd_cdb_pool
);
3264 kmem_cache_destroy(sd_cdb_cache
);
3266 class_unregister(&sd_disk_class
);
3268 for (i
= 0; i
< SD_MAJORS
; i
++) {
3269 blk_unregister_region(sd_major(i
), SD_MINORS
);
3270 unregister_blkdev(sd_major(i
), "sd");
3274 module_init(init_sd
);
3275 module_exit(exit_sd
);
3277 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3278 struct scsi_sense_hdr
*sshdr
)
3280 sd_printk(KERN_INFO
, sdkp
, " ");
3281 scsi_show_sense_hdr(sshdr
);
3282 sd_printk(KERN_INFO
, sdkp
, " ");
3283 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3286 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3288 sd_printk(KERN_INFO
, sdkp
, " ");
3289 scsi_show_result(result
);