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 cache_type_store(struct device
*dev
, struct device_attribute
*attr
,
136 const char *buf
, size_t count
)
138 int i
, ct
= -1, rcd
, wce
, sp
;
139 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
140 struct scsi_device
*sdp
= sdkp
->device
;
143 struct scsi_mode_data data
;
144 struct scsi_sense_hdr sshdr
;
145 static const char temp
[] = "temporary ";
148 if (sdp
->type
!= TYPE_DISK
)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
154 if (strncmp(buf
, temp
, sizeof(temp
) - 1) == 0) {
155 buf
+= sizeof(temp
) - 1;
156 sdkp
->cache_override
= 1;
158 sdkp
->cache_override
= 0;
161 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
162 len
= strlen(sd_cache_types
[i
]);
163 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
171 rcd
= ct
& 0x01 ? 1 : 0;
172 wce
= ct
& 0x02 ? 1 : 0;
174 if (sdkp
->cache_override
) {
180 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
181 SD_MAX_RETRIES
, &data
, NULL
))
183 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
184 data
.block_descriptor_length
);
185 buffer_data
= buffer
+ data
.header_length
+
186 data
.block_descriptor_length
;
187 buffer_data
[2] &= ~0x05;
188 buffer_data
[2] |= wce
<< 2 | rcd
;
189 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
191 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
192 SD_MAX_RETRIES
, &data
, &sshdr
)) {
193 if (scsi_sense_valid(&sshdr
))
194 sd_print_sense_hdr(sdkp
, &sshdr
);
197 revalidate_disk(sdkp
->disk
);
202 manage_start_stop_show(struct device
*dev
, struct device_attribute
*attr
,
205 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
206 struct scsi_device
*sdp
= sdkp
->device
;
208 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
212 manage_start_stop_store(struct device
*dev
, struct device_attribute
*attr
,
213 const char *buf
, size_t count
)
215 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
216 struct scsi_device
*sdp
= sdkp
->device
;
218 if (!capable(CAP_SYS_ADMIN
))
221 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
225 static DEVICE_ATTR_RW(manage_start_stop
);
228 allow_restart_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
230 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
232 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
236 allow_restart_store(struct device
*dev
, struct device_attribute
*attr
,
237 const char *buf
, size_t count
)
239 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
240 struct scsi_device
*sdp
= sdkp
->device
;
242 if (!capable(CAP_SYS_ADMIN
))
245 if (sdp
->type
!= TYPE_DISK
)
248 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
252 static DEVICE_ATTR_RW(allow_restart
);
255 cache_type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
257 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
258 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
260 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
262 static DEVICE_ATTR_RW(cache_type
);
265 FUA_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
267 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
269 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
271 static DEVICE_ATTR_RO(FUA
);
274 protection_type_show(struct device
*dev
, struct device_attribute
*attr
,
277 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
279 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
283 protection_type_store(struct device
*dev
, struct device_attribute
*attr
,
284 const char *buf
, size_t count
)
286 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
290 if (!capable(CAP_SYS_ADMIN
))
293 err
= kstrtouint(buf
, 10, &val
);
298 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
299 sdkp
->protection_type
= val
;
303 static DEVICE_ATTR_RW(protection_type
);
306 protection_mode_show(struct device
*dev
, struct device_attribute
*attr
,
309 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
310 struct scsi_device
*sdp
= sdkp
->device
;
311 unsigned int dif
, dix
;
313 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
314 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
316 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
322 return snprintf(buf
, 20, "none\n");
324 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
326 static DEVICE_ATTR_RO(protection_mode
);
329 app_tag_own_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
331 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
333 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
335 static DEVICE_ATTR_RO(app_tag_own
);
338 thin_provisioning_show(struct device
*dev
, struct device_attribute
*attr
,
341 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
343 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
345 static DEVICE_ATTR_RO(thin_provisioning
);
347 static const char *lbp_mode
[] = {
348 [SD_LBP_FULL
] = "full",
349 [SD_LBP_UNMAP
] = "unmap",
350 [SD_LBP_WS16
] = "writesame_16",
351 [SD_LBP_WS10
] = "writesame_10",
352 [SD_LBP_ZERO
] = "writesame_zero",
353 [SD_LBP_DISABLE
] = "disabled",
357 provisioning_mode_show(struct device
*dev
, struct device_attribute
*attr
,
360 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
362 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
366 provisioning_mode_store(struct device
*dev
, struct device_attribute
*attr
,
367 const char *buf
, size_t count
)
369 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
370 struct scsi_device
*sdp
= sdkp
->device
;
372 if (!capable(CAP_SYS_ADMIN
))
375 if (sdp
->type
!= TYPE_DISK
)
378 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
379 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
380 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
381 sd_config_discard(sdkp
, SD_LBP_WS16
);
382 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
383 sd_config_discard(sdkp
, SD_LBP_WS10
);
384 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
385 sd_config_discard(sdkp
, SD_LBP_ZERO
);
386 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
387 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
393 static DEVICE_ATTR_RW(provisioning_mode
);
396 max_medium_access_timeouts_show(struct device
*dev
,
397 struct device_attribute
*attr
, char *buf
)
399 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
401 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
405 max_medium_access_timeouts_store(struct device
*dev
,
406 struct device_attribute
*attr
, const char *buf
,
409 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
412 if (!capable(CAP_SYS_ADMIN
))
415 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
417 return err
? err
: count
;
419 static DEVICE_ATTR_RW(max_medium_access_timeouts
);
422 max_write_same_blocks_show(struct device
*dev
, struct device_attribute
*attr
,
425 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
427 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
431 max_write_same_blocks_store(struct device
*dev
, struct device_attribute
*attr
,
432 const char *buf
, size_t count
)
434 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
435 struct scsi_device
*sdp
= sdkp
->device
;
439 if (!capable(CAP_SYS_ADMIN
))
442 if (sdp
->type
!= TYPE_DISK
)
445 err
= kstrtoul(buf
, 10, &max
);
451 sdp
->no_write_same
= 1;
452 else if (max
<= SD_MAX_WS16_BLOCKS
) {
453 sdp
->no_write_same
= 0;
454 sdkp
->max_ws_blocks
= max
;
457 sd_config_write_same(sdkp
);
461 static DEVICE_ATTR_RW(max_write_same_blocks
);
463 static struct attribute
*sd_disk_attrs
[] = {
464 &dev_attr_cache_type
.attr
,
466 &dev_attr_allow_restart
.attr
,
467 &dev_attr_manage_start_stop
.attr
,
468 &dev_attr_protection_type
.attr
,
469 &dev_attr_protection_mode
.attr
,
470 &dev_attr_app_tag_own
.attr
,
471 &dev_attr_thin_provisioning
.attr
,
472 &dev_attr_provisioning_mode
.attr
,
473 &dev_attr_max_write_same_blocks
.attr
,
474 &dev_attr_max_medium_access_timeouts
.attr
,
477 ATTRIBUTE_GROUPS(sd_disk
);
479 static struct class sd_disk_class
= {
481 .owner
= THIS_MODULE
,
482 .dev_release
= scsi_disk_release
,
483 .dev_groups
= sd_disk_groups
,
486 static const struct dev_pm_ops sd_pm_ops
= {
487 .suspend
= sd_suspend
,
489 .poweroff
= sd_suspend
,
490 .restore
= sd_resume
,
491 .runtime_suspend
= sd_suspend
,
492 .runtime_resume
= sd_resume
,
495 static struct scsi_driver sd_template
= {
496 .owner
= THIS_MODULE
,
501 .shutdown
= sd_shutdown
,
506 .eh_action
= sd_eh_action
,
510 * Dummy kobj_map->probe function.
511 * The default ->probe function will call modprobe, which is
512 * pointless as this module is already loaded.
514 static struct kobject
*sd_default_probe(dev_t devt
, int *partno
, void *data
)
520 * Device no to disk mapping:
522 * major disc2 disc p1
523 * |............|.............|....|....| <- dev_t
526 * Inside a major, we have 16k disks, however mapped non-
527 * contiguously. The first 16 disks are for major0, the next
528 * ones with major1, ... Disk 256 is for major0 again, disk 272
530 * As we stay compatible with our numbering scheme, we can reuse
531 * the well-know SCSI majors 8, 65--71, 136--143.
533 static int sd_major(int major_idx
)
537 return SCSI_DISK0_MAJOR
;
539 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
541 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
544 return 0; /* shut up gcc */
548 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
550 struct scsi_disk
*sdkp
= NULL
;
552 if (disk
->private_data
) {
553 sdkp
= scsi_disk(disk
);
554 if (scsi_device_get(sdkp
->device
) == 0)
555 get_device(&sdkp
->dev
);
562 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
564 struct scsi_disk
*sdkp
;
566 mutex_lock(&sd_ref_mutex
);
567 sdkp
= __scsi_disk_get(disk
);
568 mutex_unlock(&sd_ref_mutex
);
572 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
574 struct scsi_disk
*sdkp
;
576 mutex_lock(&sd_ref_mutex
);
577 sdkp
= dev_get_drvdata(dev
);
579 sdkp
= __scsi_disk_get(sdkp
->disk
);
580 mutex_unlock(&sd_ref_mutex
);
584 static void scsi_disk_put(struct scsi_disk
*sdkp
)
586 struct scsi_device
*sdev
= sdkp
->device
;
588 mutex_lock(&sd_ref_mutex
);
589 put_device(&sdkp
->dev
);
590 scsi_device_put(sdev
);
591 mutex_unlock(&sd_ref_mutex
);
594 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
596 unsigned int prot_op
= SCSI_PROT_NORMAL
;
597 unsigned int dix
= scsi_prot_sg_count(scmd
);
599 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
601 prot_op
= SCSI_PROT_READ_PASS
;
602 else if (dif
&& !dix
)
603 prot_op
= SCSI_PROT_READ_STRIP
;
604 else if (!dif
&& dix
)
605 prot_op
= SCSI_PROT_READ_INSERT
;
608 prot_op
= SCSI_PROT_WRITE_PASS
;
609 else if (dif
&& !dix
)
610 prot_op
= SCSI_PROT_WRITE_INSERT
;
611 else if (!dif
&& dix
)
612 prot_op
= SCSI_PROT_WRITE_STRIP
;
615 scsi_set_prot_op(scmd
, prot_op
);
616 scsi_set_prot_type(scmd
, dif
);
619 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
621 struct request_queue
*q
= sdkp
->disk
->queue
;
622 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
623 unsigned int max_blocks
= 0;
625 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
626 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
628 q
->limits
.discard_granularity
=
629 max(sdkp
->physical_block_size
,
630 sdkp
->unmap_granularity
* logical_block_size
);
632 sdkp
->provisioning_mode
= mode
;
637 q
->limits
.max_discard_sectors
= 0;
638 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
642 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
643 (u32
)SD_MAX_WS16_BLOCKS
);
647 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
648 (u32
)SD_MAX_WS16_BLOCKS
);
652 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
653 (u32
)SD_MAX_WS10_BLOCKS
);
657 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
658 (u32
)SD_MAX_WS10_BLOCKS
);
659 q
->limits
.discard_zeroes_data
= 1;
663 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
664 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
668 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
669 * @sdp: scsi device to operate one
670 * @rq: Request to prepare
672 * Will issue either UNMAP or WRITE SAME(16) depending on preference
673 * indicated by target device.
675 static int sd_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
677 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
678 sector_t sector
= blk_rq_pos(rq
);
679 unsigned int nr_sectors
= blk_rq_sectors(rq
);
680 unsigned int nr_bytes
= blk_rq_bytes(rq
);
686 sector
>>= ilog2(sdp
->sector_size
) - 9;
687 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
688 rq
->timeout
= SD_TIMEOUT
;
690 memset(rq
->cmd
, 0, rq
->cmd_len
);
692 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
694 return BLKPREP_DEFER
;
696 switch (sdkp
->provisioning_mode
) {
698 buf
= page_address(page
);
704 put_unaligned_be16(6 + 16, &buf
[0]);
705 put_unaligned_be16(16, &buf
[2]);
706 put_unaligned_be64(sector
, &buf
[8]);
707 put_unaligned_be32(nr_sectors
, &buf
[16]);
714 rq
->cmd
[0] = WRITE_SAME_16
;
715 rq
->cmd
[1] = 0x8; /* UNMAP */
716 put_unaligned_be64(sector
, &rq
->cmd
[2]);
717 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
719 len
= sdkp
->device
->sector_size
;
725 rq
->cmd
[0] = WRITE_SAME
;
726 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
727 rq
->cmd
[1] = 0x8; /* UNMAP */
728 put_unaligned_be32(sector
, &rq
->cmd
[2]);
729 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
731 len
= sdkp
->device
->sector_size
;
739 blk_add_request_payload(rq
, page
, len
);
740 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
741 rq
->buffer
= page_address(page
);
742 rq
->__data_len
= nr_bytes
;
745 if (ret
!= BLKPREP_OK
) {
752 static void sd_config_write_same(struct scsi_disk
*sdkp
)
754 struct request_queue
*q
= sdkp
->disk
->queue
;
755 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
757 if (sdkp
->device
->no_write_same
) {
758 sdkp
->max_ws_blocks
= 0;
762 /* Some devices can not handle block counts above 0xffff despite
763 * supporting WRITE SAME(16). Consequently we default to 64k
764 * blocks per I/O unless the device explicitly advertises a
767 if (sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
768 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
769 (u32
)SD_MAX_WS16_BLOCKS
);
770 else if (sdkp
->ws16
|| sdkp
->ws10
|| sdkp
->device
->no_report_opcodes
)
771 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
772 (u32
)SD_MAX_WS10_BLOCKS
);
774 sdkp
->device
->no_write_same
= 1;
775 sdkp
->max_ws_blocks
= 0;
779 blk_queue_max_write_same_sectors(q
, sdkp
->max_ws_blocks
*
780 (logical_block_size
>> 9));
784 * sd_setup_write_same_cmnd - write the same data to multiple blocks
785 * @sdp: scsi device to operate one
786 * @rq: Request to prepare
788 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
789 * preference indicated by target device.
791 static int sd_setup_write_same_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
793 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
794 struct bio
*bio
= rq
->bio
;
795 sector_t sector
= blk_rq_pos(rq
);
796 unsigned int nr_sectors
= blk_rq_sectors(rq
);
797 unsigned int nr_bytes
= blk_rq_bytes(rq
);
800 if (sdkp
->device
->no_write_same
)
803 BUG_ON(bio_offset(bio
) || bio_iovec(bio
)->bv_len
!= sdp
->sector_size
);
805 sector
>>= ilog2(sdp
->sector_size
) - 9;
806 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
808 rq
->__data_len
= sdp
->sector_size
;
809 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
810 memset(rq
->cmd
, 0, rq
->cmd_len
);
812 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
814 rq
->cmd
[0] = WRITE_SAME_16
;
815 put_unaligned_be64(sector
, &rq
->cmd
[2]);
816 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
819 rq
->cmd
[0] = WRITE_SAME
;
820 put_unaligned_be32(sector
, &rq
->cmd
[2]);
821 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
824 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
825 rq
->__data_len
= nr_bytes
;
830 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
832 rq
->timeout
= SD_FLUSH_TIMEOUT
;
833 rq
->retries
= SD_MAX_RETRIES
;
834 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
837 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
840 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
842 struct scsi_cmnd
*SCpnt
= rq
->special
;
844 if (rq
->cmd_flags
& REQ_DISCARD
) {
845 free_page((unsigned long)rq
->buffer
);
848 if (SCpnt
->cmnd
!= rq
->cmd
) {
849 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
856 * sd_prep_fn - build a scsi (read or write) command from
857 * information in the request structure.
858 * @SCpnt: pointer to mid-level's per scsi command structure that
859 * contains request and into which the scsi command is written
861 * Returns 1 if successful and 0 if error (or cannot be done now).
863 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
865 struct scsi_cmnd
*SCpnt
;
866 struct scsi_device
*sdp
= q
->queuedata
;
867 struct gendisk
*disk
= rq
->rq_disk
;
868 struct scsi_disk
*sdkp
;
869 sector_t block
= blk_rq_pos(rq
);
871 unsigned int this_count
= blk_rq_sectors(rq
);
873 unsigned char protect
;
876 * Discard request come in as REQ_TYPE_FS but we turn them into
877 * block PC requests to make life easier.
879 if (rq
->cmd_flags
& REQ_DISCARD
) {
880 ret
= sd_setup_discard_cmnd(sdp
, rq
);
882 } else if (rq
->cmd_flags
& REQ_WRITE_SAME
) {
883 ret
= sd_setup_write_same_cmnd(sdp
, rq
);
885 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
886 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
888 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
889 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
891 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
895 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
896 if (ret
!= BLKPREP_OK
)
899 sdkp
= scsi_disk(disk
);
901 /* from here on until we're complete, any goto out
902 * is used for a killable error condition */
905 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
906 "sd_prep_fn: block=%llu, "
908 (unsigned long long)block
,
911 if (!sdp
|| !scsi_device_online(sdp
) ||
912 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
913 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
914 "Finishing %u sectors\n",
915 blk_rq_sectors(rq
)));
916 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
917 "Retry with 0x%p\n", SCpnt
));
923 * quietly refuse to do anything to a changed disc until
924 * the changed bit has been reset
926 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
931 * Some SD card readers can't handle multi-sector accesses which touch
932 * the last one or two hardware sectors. Split accesses as needed.
934 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
935 (sdp
->sector_size
/ 512);
937 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
938 if (block
< threshold
) {
939 /* Access up to the threshold but not beyond */
940 this_count
= threshold
- block
;
942 /* Access only a single hardware sector */
943 this_count
= sdp
->sector_size
/ 512;
947 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
948 (unsigned long long)block
));
951 * If we have a 1K hardware sectorsize, prevent access to single
952 * 512 byte sectors. In theory we could handle this - in fact
953 * the scsi cdrom driver must be able to handle this because
954 * we typically use 1K blocksizes, and cdroms typically have
955 * 2K hardware sectorsizes. Of course, things are simpler
956 * with the cdrom, since it is read-only. For performance
957 * reasons, the filesystems should be able to handle this
958 * and not force the scsi disk driver to use bounce buffers
961 if (sdp
->sector_size
== 1024) {
962 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
963 scmd_printk(KERN_ERR
, SCpnt
,
964 "Bad block number requested\n");
968 this_count
= this_count
>> 1;
971 if (sdp
->sector_size
== 2048) {
972 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
973 scmd_printk(KERN_ERR
, SCpnt
,
974 "Bad block number requested\n");
978 this_count
= this_count
>> 2;
981 if (sdp
->sector_size
== 4096) {
982 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
983 scmd_printk(KERN_ERR
, SCpnt
,
984 "Bad block number requested\n");
988 this_count
= this_count
>> 3;
991 if (rq_data_dir(rq
) == WRITE
) {
992 if (!sdp
->writeable
) {
995 SCpnt
->cmnd
[0] = WRITE_6
;
996 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
998 if (blk_integrity_rq(rq
))
999 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
1001 } else if (rq_data_dir(rq
) == READ
) {
1002 SCpnt
->cmnd
[0] = READ_6
;
1003 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
1005 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
1009 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
1010 "%s %d/%u 512 byte blocks.\n",
1011 (rq_data_dir(rq
) == WRITE
) ?
1012 "writing" : "reading", this_count
,
1013 blk_rq_sectors(rq
)));
1015 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1016 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
1022 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
1023 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1025 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1026 ret
= BLKPREP_DEFER
;
1030 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1031 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1032 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1033 SCpnt
->cmnd
[7] = 0x18;
1034 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1035 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1038 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1039 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1040 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1041 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1042 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1043 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1044 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1045 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1047 /* Expected Indirect LBA */
1048 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1049 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1050 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1051 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1053 /* Transfer length */
1054 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1055 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1056 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1057 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1058 } else if (sdp
->use_16_for_rw
) {
1059 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1060 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1061 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1062 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1063 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1064 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1065 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1066 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1067 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1068 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1069 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1070 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1071 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1072 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1073 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1074 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1075 scsi_device_protection(SCpnt
->device
) ||
1076 SCpnt
->device
->use_10_for_rw
) {
1077 if (this_count
> 0xffff)
1078 this_count
= 0xffff;
1080 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1081 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1082 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1083 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1084 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1085 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1086 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1087 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1088 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1090 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1092 * This happens only if this drive failed
1093 * 10byte rw command with ILLEGAL_REQUEST
1094 * during operation and thus turned off
1097 scmd_printk(KERN_ERR
, SCpnt
,
1098 "FUA write on READ/WRITE(6) drive\n");
1102 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1103 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1104 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1105 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1108 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1110 /* If DIF or DIX is enabled, tell HBA how to handle request */
1111 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
1112 sd_prot_op(SCpnt
, host_dif
);
1115 * We shouldn't disconnect in the middle of a sector, so with a dumb
1116 * host adapter, it's safe to assume that we can at least transfer
1117 * this many bytes between each connect / disconnect.
1119 SCpnt
->transfersize
= sdp
->sector_size
;
1120 SCpnt
->underflow
= this_count
<< 9;
1121 SCpnt
->allowed
= SD_MAX_RETRIES
;
1124 * This indicates that the command is ready from our end to be
1129 return scsi_prep_return(q
, rq
, ret
);
1133 * sd_open - open a scsi disk device
1134 * @inode: only i_rdev member may be used
1135 * @filp: only f_mode and f_flags may be used
1137 * Returns 0 if successful. Returns a negated errno value in case
1140 * Note: This can be called from a user context (e.g. fsck(1) )
1141 * or from within the kernel (e.g. as a result of a mount(1) ).
1142 * In the latter case @inode and @filp carry an abridged amount
1143 * of information as noted above.
1145 * Locking: called with bdev->bd_mutex held.
1147 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1149 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1150 struct scsi_device
*sdev
;
1156 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1158 sdev
= sdkp
->device
;
1161 * If the device is in error recovery, wait until it is done.
1162 * If the device is offline, then disallow any access to it.
1165 if (!scsi_block_when_processing_errors(sdev
))
1168 if (sdev
->removable
|| sdkp
->write_prot
)
1169 check_disk_change(bdev
);
1172 * If the drive is empty, just let the open fail.
1174 retval
= -ENOMEDIUM
;
1175 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1179 * If the device has the write protect tab set, have the open fail
1180 * if the user expects to be able to write to the thing.
1183 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1187 * It is possible that the disk changing stuff resulted in
1188 * the device being taken offline. If this is the case,
1189 * report this to the user, and don't pretend that the
1190 * open actually succeeded.
1193 if (!scsi_device_online(sdev
))
1196 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1197 if (scsi_block_when_processing_errors(sdev
))
1198 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1204 scsi_disk_put(sdkp
);
1209 * sd_release - invoked when the (last) close(2) is called on this
1211 * @inode: only i_rdev member may be used
1212 * @filp: only f_mode and f_flags may be used
1216 * Note: may block (uninterruptible) if error recovery is underway
1219 * Locking: called with bdev->bd_mutex held.
1221 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1223 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1224 struct scsi_device
*sdev
= sdkp
->device
;
1226 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1228 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1229 if (scsi_block_when_processing_errors(sdev
))
1230 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1234 * XXX and what if there are packets in flight and this close()
1235 * XXX is followed by a "rmmod sd_mod"?
1238 scsi_disk_put(sdkp
);
1241 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1243 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1244 struct scsi_device
*sdp
= sdkp
->device
;
1245 struct Scsi_Host
*host
= sdp
->host
;
1248 /* default to most commonly used values */
1249 diskinfo
[0] = 0x40; /* 1 << 6 */
1250 diskinfo
[1] = 0x20; /* 1 << 5 */
1251 diskinfo
[2] = sdkp
->capacity
>> 11;
1253 /* override with calculated, extended default, or driver values */
1254 if (host
->hostt
->bios_param
)
1255 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1257 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1259 geo
->heads
= diskinfo
[0];
1260 geo
->sectors
= diskinfo
[1];
1261 geo
->cylinders
= diskinfo
[2];
1266 * sd_ioctl - process an ioctl
1267 * @inode: only i_rdev/i_bdev members may be used
1268 * @filp: only f_mode and f_flags may be used
1269 * @cmd: ioctl command number
1270 * @arg: this is third argument given to ioctl(2) system call.
1271 * Often contains a pointer.
1273 * Returns 0 if successful (some ioctls return positive numbers on
1274 * success as well). Returns a negated errno value in case of error.
1276 * Note: most ioctls are forward onto the block subsystem or further
1277 * down in the scsi subsystem.
1279 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1280 unsigned int cmd
, unsigned long arg
)
1282 struct gendisk
*disk
= bdev
->bd_disk
;
1283 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1284 struct scsi_device
*sdp
= sdkp
->device
;
1285 void __user
*p
= (void __user
*)arg
;
1288 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1289 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1291 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1296 * If we are in the middle of error recovery, don't let anyone
1297 * else try and use this device. Also, if error recovery fails, it
1298 * may try and take the device offline, in which case all further
1299 * access to the device is prohibited.
1301 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1302 (mode
& FMODE_NDELAY
) != 0);
1303 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1307 * Send SCSI addressing ioctls directly to mid level, send other
1308 * ioctls to block level and then onto mid level if they can't be
1312 case SCSI_IOCTL_GET_IDLUN
:
1313 case SCSI_IOCTL_GET_BUS_NUMBER
:
1314 error
= scsi_ioctl(sdp
, cmd
, p
);
1317 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1318 if (error
!= -ENOTTY
)
1320 error
= scsi_ioctl(sdp
, cmd
, p
);
1327 static void set_media_not_present(struct scsi_disk
*sdkp
)
1329 if (sdkp
->media_present
)
1330 sdkp
->device
->changed
= 1;
1332 if (sdkp
->device
->removable
) {
1333 sdkp
->media_present
= 0;
1338 static int media_not_present(struct scsi_disk
*sdkp
,
1339 struct scsi_sense_hdr
*sshdr
)
1341 if (!scsi_sense_valid(sshdr
))
1344 /* not invoked for commands that could return deferred errors */
1345 switch (sshdr
->sense_key
) {
1346 case UNIT_ATTENTION
:
1348 /* medium not present */
1349 if (sshdr
->asc
== 0x3A) {
1350 set_media_not_present(sdkp
);
1358 * sd_check_events - check media events
1359 * @disk: kernel device descriptor
1360 * @clearing: disk events currently being cleared
1362 * Returns mask of DISK_EVENT_*.
1364 * Note: this function is invoked from the block subsystem.
1366 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1368 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1369 struct scsi_device
*sdp
= sdkp
->device
;
1370 struct scsi_sense_hdr
*sshdr
= NULL
;
1373 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1376 * If the device is offline, don't send any commands - just pretend as
1377 * if the command failed. If the device ever comes back online, we
1378 * can deal with it then. It is only because of unrecoverable errors
1379 * that we would ever take a device offline in the first place.
1381 if (!scsi_device_online(sdp
)) {
1382 set_media_not_present(sdkp
);
1387 * Using TEST_UNIT_READY enables differentiation between drive with
1388 * no cartridge loaded - NOT READY, drive with changed cartridge -
1389 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1391 * Drives that auto spin down. eg iomega jaz 1G, will be started
1392 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1393 * sd_revalidate() is called.
1397 if (scsi_block_when_processing_errors(sdp
)) {
1398 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1399 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1403 /* failed to execute TUR, assume media not present */
1404 if (host_byte(retval
)) {
1405 set_media_not_present(sdkp
);
1409 if (media_not_present(sdkp
, sshdr
))
1413 * For removable scsi disk we have to recognise the presence
1414 * of a disk in the drive.
1416 if (!sdkp
->media_present
)
1418 sdkp
->media_present
= 1;
1421 * sdp->changed is set under the following conditions:
1423 * Medium present state has changed in either direction.
1424 * Device has indicated UNIT_ATTENTION.
1427 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1432 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1435 struct scsi_device
*sdp
= sdkp
->device
;
1436 struct scsi_sense_hdr sshdr
;
1438 if (!scsi_device_online(sdp
))
1442 for (retries
= 3; retries
> 0; --retries
) {
1443 unsigned char cmd
[10] = { 0 };
1445 cmd
[0] = SYNCHRONIZE_CACHE
;
1447 * Leave the rest of the command zero to indicate
1450 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1451 &sshdr
, SD_FLUSH_TIMEOUT
,
1452 SD_MAX_RETRIES
, NULL
, REQ_PM
);
1458 sd_print_result(sdkp
, res
);
1459 if (driver_byte(res
) & DRIVER_SENSE
)
1460 sd_print_sense_hdr(sdkp
, &sshdr
);
1468 static void sd_rescan(struct device
*dev
)
1470 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1473 revalidate_disk(sdkp
->disk
);
1474 scsi_disk_put(sdkp
);
1479 #ifdef CONFIG_COMPAT
1481 * This gets directly called from VFS. When the ioctl
1482 * is not recognized we go back to the other translation paths.
1484 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1485 unsigned int cmd
, unsigned long arg
)
1487 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1490 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1495 * If we are in the middle of error recovery, don't let anyone
1496 * else try and use this device. Also, if error recovery fails, it
1497 * may try and take the device offline, in which case all further
1498 * access to the device is prohibited.
1500 if (!scsi_block_when_processing_errors(sdev
))
1503 if (sdev
->host
->hostt
->compat_ioctl
) {
1504 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1510 * Let the static ioctl translation table take care of it.
1512 return -ENOIOCTLCMD
;
1516 static const struct block_device_operations sd_fops
= {
1517 .owner
= THIS_MODULE
,
1519 .release
= sd_release
,
1521 .getgeo
= sd_getgeo
,
1522 #ifdef CONFIG_COMPAT
1523 .compat_ioctl
= sd_compat_ioctl
,
1525 .check_events
= sd_check_events
,
1526 .revalidate_disk
= sd_revalidate_disk
,
1527 .unlock_native_capacity
= sd_unlock_native_capacity
,
1531 * sd_eh_action - error handling callback
1532 * @scmd: sd-issued command that has failed
1533 * @eh_cmnd: The command that was sent during error handling
1534 * @eh_cmnd_len: Length of eh_cmnd in bytes
1535 * @eh_disp: The recovery disposition suggested by the midlayer
1537 * This function is called by the SCSI midlayer upon completion of
1538 * an error handling command (TEST UNIT READY, START STOP UNIT,
1539 * etc.) The command sent to the device by the error handler is
1540 * stored in eh_cmnd. The result of sending the eh command is
1541 * passed in eh_disp.
1543 static int sd_eh_action(struct scsi_cmnd
*scmd
, unsigned char *eh_cmnd
,
1544 int eh_cmnd_len
, int eh_disp
)
1546 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1548 if (!scsi_device_online(scmd
->device
) ||
1549 !scsi_medium_access_command(scmd
))
1553 * The device has timed out executing a medium access command.
1554 * However, the TEST UNIT READY command sent during error
1555 * handling completed successfully. Either the device is in the
1556 * process of recovering or has it suffered an internal failure
1557 * that prevents access to the storage medium.
1559 if (host_byte(scmd
->result
) == DID_TIME_OUT
&& eh_disp
== SUCCESS
&&
1560 eh_cmnd_len
&& eh_cmnd
[0] == TEST_UNIT_READY
)
1561 sdkp
->medium_access_timed_out
++;
1564 * If the device keeps failing read/write commands but TEST UNIT
1565 * READY always completes successfully we assume that medium
1566 * access is no longer possible and take the device offline.
1568 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1569 scmd_printk(KERN_ERR
, scmd
,
1570 "Medium access timeout failure. Offlining disk!\n");
1571 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1579 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1581 u64 start_lba
= blk_rq_pos(scmd
->request
);
1582 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1583 u64 factor
= scmd
->device
->sector_size
/ 512;
1587 * resid is optional but mostly filled in. When it's unused,
1588 * its value is zero, so we assume the whole buffer transferred
1590 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1591 unsigned int good_bytes
;
1593 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1596 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1597 SCSI_SENSE_BUFFERSIZE
,
1602 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1605 /* be careful ... don't want any overflows */
1606 do_div(start_lba
, factor
);
1607 do_div(end_lba
, factor
);
1609 /* The bad lba was reported incorrectly, we have no idea where
1612 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1615 /* This computation should always be done in terms of
1616 * the resolution of the device's medium.
1618 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1619 return min(good_bytes
, transferred
);
1623 * sd_done - bottom half handler: called when the lower level
1624 * driver has completed (successfully or otherwise) a scsi command.
1625 * @SCpnt: mid-level's per command structure.
1627 * Note: potentially run from within an ISR. Must not block.
1629 static int sd_done(struct scsi_cmnd
*SCpnt
)
1631 int result
= SCpnt
->result
;
1632 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1633 struct scsi_sense_hdr sshdr
;
1634 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1635 struct request
*req
= SCpnt
->request
;
1636 int sense_valid
= 0;
1637 int sense_deferred
= 0;
1638 unsigned char op
= SCpnt
->cmnd
[0];
1639 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1641 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1643 good_bytes
= blk_rq_bytes(req
);
1644 scsi_set_resid(SCpnt
, 0);
1647 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1652 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1654 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1656 #ifdef CONFIG_SCSI_LOGGING
1657 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1659 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1660 "sd_done: sb[respc,sk,asc,"
1661 "ascq]=%x,%x,%x,%x\n",
1662 sshdr
.response_code
,
1663 sshdr
.sense_key
, sshdr
.asc
,
1667 if (driver_byte(result
) != DRIVER_SENSE
&&
1668 (!sense_valid
|| sense_deferred
))
1671 sdkp
->medium_access_timed_out
= 0;
1673 switch (sshdr
.sense_key
) {
1674 case HARDWARE_ERROR
:
1676 good_bytes
= sd_completed_bytes(SCpnt
);
1678 case RECOVERED_ERROR
:
1679 good_bytes
= scsi_bufflen(SCpnt
);
1682 /* This indicates a false check condition, so ignore it. An
1683 * unknown amount of data was transferred so treat it as an
1686 scsi_print_sense("sd", SCpnt
);
1688 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1690 case ABORTED_COMMAND
:
1691 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1692 good_bytes
= sd_completed_bytes(SCpnt
);
1694 case ILLEGAL_REQUEST
:
1695 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1696 good_bytes
= sd_completed_bytes(SCpnt
);
1697 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1698 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1701 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1706 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1708 sdkp
->device
->no_write_same
= 1;
1709 sd_config_write_same(sdkp
);
1712 req
->__data_len
= blk_rq_bytes(req
);
1713 req
->cmd_flags
|= REQ_QUIET
;
1722 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1723 sd_dif_complete(SCpnt
, good_bytes
);
1729 * spinup disk - called only in sd_revalidate_disk()
1732 sd_spinup_disk(struct scsi_disk
*sdkp
)
1734 unsigned char cmd
[10];
1735 unsigned long spintime_expire
= 0;
1736 int retries
, spintime
;
1737 unsigned int the_result
;
1738 struct scsi_sense_hdr sshdr
;
1739 int sense_valid
= 0;
1743 /* Spin up drives, as required. Only do this at boot time */
1744 /* Spinup needs to be done for module loads too. */
1749 cmd
[0] = TEST_UNIT_READY
;
1750 memset((void *) &cmd
[1], 0, 9);
1752 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1755 SD_MAX_RETRIES
, NULL
);
1758 * If the drive has indicated to us that it
1759 * doesn't have any media in it, don't bother
1760 * with any more polling.
1762 if (media_not_present(sdkp
, &sshdr
))
1766 sense_valid
= scsi_sense_valid(&sshdr
);
1768 } while (retries
< 3 &&
1769 (!scsi_status_is_good(the_result
) ||
1770 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1771 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1773 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1774 /* no sense, TUR either succeeded or failed
1775 * with a status error */
1776 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1777 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1778 sd_print_result(sdkp
, the_result
);
1784 * The device does not want the automatic start to be issued.
1786 if (sdkp
->device
->no_start_on_add
)
1789 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1790 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1791 break; /* manual intervention required */
1792 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1793 break; /* standby */
1794 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1795 break; /* unavailable */
1797 * Issue command to spin up drive when not ready
1800 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1801 cmd
[0] = START_STOP
;
1802 cmd
[1] = 1; /* Return immediately */
1803 memset((void *) &cmd
[2], 0, 8);
1804 cmd
[4] = 1; /* Start spin cycle */
1805 if (sdkp
->device
->start_stop_pwr_cond
)
1807 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1809 SD_TIMEOUT
, SD_MAX_RETRIES
,
1811 spintime_expire
= jiffies
+ 100 * HZ
;
1814 /* Wait 1 second for next try */
1819 * Wait for USB flash devices with slow firmware.
1820 * Yes, this sense key/ASC combination shouldn't
1821 * occur here. It's characteristic of these devices.
1823 } else if (sense_valid
&&
1824 sshdr
.sense_key
== UNIT_ATTENTION
&&
1825 sshdr
.asc
== 0x28) {
1827 spintime_expire
= jiffies
+ 5 * HZ
;
1830 /* Wait 1 second for next try */
1833 /* we don't understand the sense code, so it's
1834 * probably pointless to loop */
1836 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1837 sd_print_sense_hdr(sdkp
, &sshdr
);
1842 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1845 if (scsi_status_is_good(the_result
))
1848 printk("not responding...\n");
1854 * Determine whether disk supports Data Integrity Field.
1856 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1858 struct scsi_device
*sdp
= sdkp
->device
;
1862 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1865 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1867 if (type
> SD_DIF_TYPE3_PROTECTION
)
1869 else if (scsi_host_dif_capable(sdp
->host
, type
))
1872 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1875 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1876 " protection type %u. Disabling disk!\n",
1880 sd_printk(KERN_NOTICE
, sdkp
,
1881 "Enabling DIF Type %u protection\n", type
);
1884 sd_printk(KERN_NOTICE
, sdkp
,
1885 "Disabling DIF Type %u protection\n", type
);
1889 sdkp
->protection_type
= type
;
1894 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1895 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1898 sd_print_result(sdkp
, the_result
);
1899 if (driver_byte(the_result
) & DRIVER_SENSE
)
1900 sd_print_sense_hdr(sdkp
, sshdr
);
1902 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1905 * Set dirty bit for removable devices if not ready -
1906 * sometimes drives will not report this properly.
1908 if (sdp
->removable
&&
1909 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1910 set_media_not_present(sdkp
);
1913 * We used to set media_present to 0 here to indicate no media
1914 * in the drive, but some drives fail read capacity even with
1915 * media present, so we can't do that.
1917 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1921 #if RC16_LEN > SD_BUF_SIZE
1922 #error RC16_LEN must not be more than SD_BUF_SIZE
1925 #define READ_CAPACITY_RETRIES_ON_RESET 10
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 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2178 * The user might want to re-format the drive with
2179 * a supported sectorsize. Once this happens, it
2180 * would be relatively trivial to set the thing up.
2181 * For this reason, we leave the thing in the table.
2185 * set a bogus sector size so the normal read/write
2186 * logic in the block layer will eventually refuse any
2187 * request on this device without tripping over power
2188 * of two sector size assumptions
2192 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2195 char cap_str_2
[10], cap_str_10
[10];
2196 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2198 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2200 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2201 sizeof(cap_str_10
));
2203 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2204 sd_printk(KERN_NOTICE
, sdkp
,
2205 "%llu %d-byte logical blocks: (%s/%s)\n",
2206 (unsigned long long)sdkp
->capacity
,
2207 sector_size
, cap_str_10
, cap_str_2
);
2209 if (sdkp
->physical_block_size
!= sector_size
)
2210 sd_printk(KERN_NOTICE
, sdkp
,
2211 "%u-byte physical blocks\n",
2212 sdkp
->physical_block_size
);
2216 sdp
->use_16_for_rw
= (sdkp
->capacity
> 0xffffffff);
2218 /* Rescale capacity to 512-byte units */
2219 if (sector_size
== 4096)
2220 sdkp
->capacity
<<= 3;
2221 else if (sector_size
== 2048)
2222 sdkp
->capacity
<<= 2;
2223 else if (sector_size
== 1024)
2224 sdkp
->capacity
<<= 1;
2226 blk_queue_physical_block_size(sdp
->request_queue
,
2227 sdkp
->physical_block_size
);
2228 sdkp
->device
->sector_size
= sector_size
;
2231 /* called with buffer of length 512 */
2233 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2234 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2235 struct scsi_sense_hdr
*sshdr
)
2237 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2238 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2243 * read write protect setting, if possible - called only in sd_revalidate_disk()
2244 * called with buffer of length SD_BUF_SIZE
2247 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2250 struct scsi_device
*sdp
= sdkp
->device
;
2251 struct scsi_mode_data data
;
2252 int old_wp
= sdkp
->write_prot
;
2254 set_disk_ro(sdkp
->disk
, 0);
2255 if (sdp
->skip_ms_page_3f
) {
2256 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2260 if (sdp
->use_192_bytes_for_3f
) {
2261 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2264 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2265 * We have to start carefully: some devices hang if we ask
2266 * for more than is available.
2268 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2271 * Second attempt: ask for page 0 When only page 0 is
2272 * implemented, a request for page 3F may return Sense Key
2273 * 5: Illegal Request, Sense Code 24: Invalid field in
2276 if (!scsi_status_is_good(res
))
2277 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2280 * Third attempt: ask 255 bytes, as we did earlier.
2282 if (!scsi_status_is_good(res
))
2283 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2287 if (!scsi_status_is_good(res
)) {
2288 sd_printk(KERN_WARNING
, sdkp
,
2289 "Test WP failed, assume Write Enabled\n");
2291 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2292 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2293 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2294 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2295 sdkp
->write_prot
? "on" : "off");
2296 sd_printk(KERN_DEBUG
, sdkp
,
2297 "Mode Sense: %02x %02x %02x %02x\n",
2298 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2304 * sd_read_cache_type - called only from sd_revalidate_disk()
2305 * called with buffer of length SD_BUF_SIZE
2308 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2311 struct scsi_device
*sdp
= sdkp
->device
;
2316 struct scsi_mode_data data
;
2317 struct scsi_sense_hdr sshdr
;
2318 int old_wce
= sdkp
->WCE
;
2319 int old_rcd
= sdkp
->RCD
;
2320 int old_dpofua
= sdkp
->DPOFUA
;
2323 if (sdkp
->cache_override
)
2327 if (sdp
->skip_ms_page_8
) {
2328 if (sdp
->type
== TYPE_RBC
)
2331 if (sdp
->skip_ms_page_3f
)
2334 if (sdp
->use_192_bytes_for_3f
)
2338 } else if (sdp
->type
== TYPE_RBC
) {
2346 /* cautiously ask */
2347 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2350 if (!scsi_status_is_good(res
))
2353 if (!data
.header_length
) {
2356 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
2359 /* that went OK, now ask for the proper length */
2363 * We're only interested in the first three bytes, actually.
2364 * But the data cache page is defined for the first 20.
2368 else if (len
> SD_BUF_SIZE
) {
2369 sd_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2370 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2373 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2377 if (len
> first_len
)
2378 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2381 if (scsi_status_is_good(res
)) {
2382 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2384 while (offset
< len
) {
2385 u8 page_code
= buffer
[offset
] & 0x3F;
2386 u8 spf
= buffer
[offset
] & 0x40;
2388 if (page_code
== 8 || page_code
== 6) {
2389 /* We're interested only in the first 3 bytes.
2391 if (len
- offset
<= 2) {
2392 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2393 "mode parameter data\n");
2396 modepage
= page_code
;
2400 /* Go to the next page */
2401 if (spf
&& len
- offset
> 3)
2402 offset
+= 4 + (buffer
[offset
+2] << 8) +
2404 else if (!spf
&& len
- offset
> 1)
2405 offset
+= 2 + buffer
[offset
+1];
2407 sd_printk(KERN_ERR
, sdkp
, "Incomplete "
2408 "mode parameter data\n");
2414 sd_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2418 if (modepage
== 8) {
2419 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2420 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2422 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2426 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2427 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2428 sd_printk(KERN_NOTICE
, sdkp
,
2429 "Uses READ/WRITE(6), disabling FUA\n");
2433 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2434 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2435 sd_printk(KERN_NOTICE
, sdkp
,
2436 "Write cache: %s, read cache: %s, %s\n",
2437 sdkp
->WCE
? "enabled" : "disabled",
2438 sdkp
->RCD
? "disabled" : "enabled",
2439 sdkp
->DPOFUA
? "supports DPO and FUA"
2440 : "doesn't support DPO or FUA");
2446 if (scsi_sense_valid(&sshdr
) &&
2447 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2448 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2449 /* Invalid field in CDB */
2450 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2452 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2455 if (sdp
->wce_default_on
) {
2456 sd_printk(KERN_NOTICE
, sdkp
, "Assuming drive cache: write back\n");
2459 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2467 * The ATO bit indicates whether the DIF application tag is available
2468 * for use by the operating system.
2470 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2473 struct scsi_device
*sdp
= sdkp
->device
;
2474 struct scsi_mode_data data
;
2475 struct scsi_sense_hdr sshdr
;
2477 if (sdp
->type
!= TYPE_DISK
)
2480 if (sdkp
->protection_type
== 0)
2483 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2484 SD_MAX_RETRIES
, &data
, &sshdr
);
2486 if (!scsi_status_is_good(res
) || !data
.header_length
||
2488 sd_printk(KERN_WARNING
, sdkp
,
2489 "getting Control mode page failed, assume no ATO\n");
2491 if (scsi_sense_valid(&sshdr
))
2492 sd_print_sense_hdr(sdkp
, &sshdr
);
2497 offset
= data
.header_length
+ data
.block_descriptor_length
;
2499 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2500 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2504 if ((buffer
[offset
+ 5] & 0x80) == 0)
2513 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2514 * @disk: disk to query
2516 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2518 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2519 const int vpd_len
= 64;
2520 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2523 /* Block Limits VPD */
2524 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2527 blk_queue_io_min(sdkp
->disk
->queue
,
2528 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2529 blk_queue_io_opt(sdkp
->disk
->queue
,
2530 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2532 if (buffer
[3] == 0x3c) {
2533 unsigned int lba_count
, desc_count
;
2535 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2540 lba_count
= get_unaligned_be32(&buffer
[20]);
2541 desc_count
= get_unaligned_be32(&buffer
[24]);
2543 if (lba_count
&& desc_count
)
2544 sdkp
->max_unmap_blocks
= lba_count
;
2546 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2548 if (buffer
[32] & 0x80)
2549 sdkp
->unmap_alignment
=
2550 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2552 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2554 if (sdkp
->max_unmap_blocks
)
2555 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2557 sd_config_discard(sdkp
, SD_LBP_WS16
);
2559 } else { /* LBP VPD page tells us what to use */
2561 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2562 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2563 else if (sdkp
->lbpws
)
2564 sd_config_discard(sdkp
, SD_LBP_WS16
);
2565 else if (sdkp
->lbpws10
)
2566 sd_config_discard(sdkp
, SD_LBP_WS10
);
2568 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2577 * sd_read_block_characteristics - Query block dev. characteristics
2578 * @disk: disk to query
2580 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2582 unsigned char *buffer
;
2584 const int vpd_len
= 64;
2586 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2589 /* Block Device Characteristics VPD */
2590 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2593 rot
= get_unaligned_be16(&buffer
[4]);
2596 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2603 * sd_read_block_provisioning - Query provisioning VPD page
2604 * @disk: disk to query
2606 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2608 unsigned char *buffer
;
2609 const int vpd_len
= 8;
2611 if (sdkp
->lbpme
== 0)
2614 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2616 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2620 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2621 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2622 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2628 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2630 struct scsi_device
*sdev
= sdkp
->device
;
2632 if (sdev
->host
->no_write_same
) {
2633 sdev
->no_write_same
= 1;
2638 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2639 /* too large values might cause issues with arcmsr */
2640 int vpd_buf_len
= 64;
2642 sdev
->no_report_opcodes
= 1;
2644 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2645 * CODES is unsupported and the device has an ATA
2646 * Information VPD page (SAT).
2648 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2649 sdev
->no_write_same
= 1;
2652 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2655 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2659 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2661 /* Attempt VPD inquiry if the device blacklist explicitly calls
2664 if (sdp
->try_vpd_pages
)
2667 * Although VPD inquiries can go to SCSI-2 type devices,
2668 * some USB ones crash on receiving them, and the pages
2669 * we currently ask for are for SPC-3 and beyond
2671 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2677 * sd_revalidate_disk - called the first time a new disk is seen,
2678 * performs disk spin up, read_capacity, etc.
2679 * @disk: struct gendisk we care about
2681 static int sd_revalidate_disk(struct gendisk
*disk
)
2683 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2684 struct scsi_device
*sdp
= sdkp
->device
;
2685 unsigned char *buffer
;
2688 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2689 "sd_revalidate_disk\n"));
2692 * If the device is offline, don't try and read capacity or any
2693 * of the other niceties.
2695 if (!scsi_device_online(sdp
))
2698 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2700 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2701 "allocation failure.\n");
2705 sd_spinup_disk(sdkp
);
2708 * Without media there is no reason to ask; moreover, some devices
2709 * react badly if we do.
2711 if (sdkp
->media_present
) {
2712 sd_read_capacity(sdkp
, buffer
);
2714 if (sd_try_extended_inquiry(sdp
)) {
2715 sd_read_block_provisioning(sdkp
);
2716 sd_read_block_limits(sdkp
);
2717 sd_read_block_characteristics(sdkp
);
2720 sd_read_write_protect_flag(sdkp
, buffer
);
2721 sd_read_cache_type(sdkp
, buffer
);
2722 sd_read_app_tag_own(sdkp
, buffer
);
2723 sd_read_write_same(sdkp
, buffer
);
2726 sdkp
->first_scan
= 0;
2729 * We now have all cache related info, determine how we deal
2730 * with flush requests.
2738 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2740 set_capacity(disk
, sdkp
->capacity
);
2741 sd_config_write_same(sdkp
);
2749 * sd_unlock_native_capacity - unlock native capacity
2750 * @disk: struct gendisk to set capacity for
2752 * Block layer calls this function if it detects that partitions
2753 * on @disk reach beyond the end of the device. If the SCSI host
2754 * implements ->unlock_native_capacity() method, it's invoked to
2755 * give it a chance to adjust the device capacity.
2758 * Defined by block layer. Might sleep.
2760 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2762 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2764 if (sdev
->host
->hostt
->unlock_native_capacity
)
2765 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2769 * sd_format_disk_name - format disk name
2770 * @prefix: name prefix - ie. "sd" for SCSI disks
2771 * @index: index of the disk to format name for
2772 * @buf: output buffer
2773 * @buflen: length of the output buffer
2775 * SCSI disk names starts at sda. The 26th device is sdz and the
2776 * 27th is sdaa. The last one for two lettered suffix is sdzz
2777 * which is followed by sdaaa.
2779 * This is basically 26 base counting with one extra 'nil' entry
2780 * at the beginning from the second digit on and can be
2781 * determined using similar method as 26 base conversion with the
2782 * index shifted -1 after each digit is computed.
2788 * 0 on success, -errno on failure.
2790 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2792 const int base
= 'z' - 'a' + 1;
2793 char *begin
= buf
+ strlen(prefix
);
2794 char *end
= buf
+ buflen
;
2804 *--p
= 'a' + (index
% unit
);
2805 index
= (index
/ unit
) - 1;
2806 } while (index
>= 0);
2808 memmove(begin
, p
, end
- p
);
2809 memcpy(buf
, prefix
, strlen(prefix
));
2815 * The asynchronous part of sd_probe
2817 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2819 struct scsi_disk
*sdkp
= data
;
2820 struct scsi_device
*sdp
;
2827 index
= sdkp
->index
;
2828 dev
= &sdp
->sdev_gendev
;
2830 gd
->major
= sd_major((index
& 0xf0) >> 4);
2831 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2832 gd
->minors
= SD_MINORS
;
2834 gd
->fops
= &sd_fops
;
2835 gd
->private_data
= &sdkp
->driver
;
2836 gd
->queue
= sdkp
->device
->request_queue
;
2838 /* defaults, until the device tells us otherwise */
2839 sdp
->sector_size
= 512;
2841 sdkp
->media_present
= 1;
2842 sdkp
->write_prot
= 0;
2843 sdkp
->cache_override
= 0;
2847 sdkp
->first_scan
= 1;
2848 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2850 sd_revalidate_disk(gd
);
2852 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2853 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2855 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2856 gd
->flags
= GENHD_FL_EXT_DEVT
;
2857 if (sdp
->removable
) {
2858 gd
->flags
|= GENHD_FL_REMOVABLE
;
2859 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2862 blk_pm_runtime_init(sdp
->request_queue
, dev
);
2865 sd_dif_config_host(sdkp
);
2867 sd_revalidate_disk(gd
);
2869 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2870 sdp
->removable
? "removable " : "");
2871 scsi_autopm_put_device(sdp
);
2872 put_device(&sdkp
->dev
);
2876 * sd_probe - called during driver initialization and whenever a
2877 * new scsi device is attached to the system. It is called once
2878 * for each scsi device (not just disks) present.
2879 * @dev: pointer to device object
2881 * Returns 0 if successful (or not interested in this scsi device
2882 * (e.g. scanner)); 1 when there is an error.
2884 * Note: this function is invoked from the scsi mid-level.
2885 * This function sets up the mapping between a given
2886 * <host,channel,id,lun> (found in sdp) and new device name
2887 * (e.g. /dev/sda). More precisely it is the block device major
2888 * and minor number that is chosen here.
2890 * Assume sd_probe is not re-entrant (for time being)
2891 * Also think about sd_probe() and sd_remove() running coincidentally.
2893 static int sd_probe(struct device
*dev
)
2895 struct scsi_device
*sdp
= to_scsi_device(dev
);
2896 struct scsi_disk
*sdkp
;
2902 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2905 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2909 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2913 gd
= alloc_disk(SD_MINORS
);
2918 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2921 spin_lock(&sd_index_lock
);
2922 error
= ida_get_new(&sd_index_ida
, &index
);
2923 spin_unlock(&sd_index_lock
);
2924 } while (error
== -EAGAIN
);
2927 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2931 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2933 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2934 goto out_free_index
;
2938 sdkp
->driver
= &sd_template
;
2940 sdkp
->index
= index
;
2941 atomic_set(&sdkp
->openers
, 0);
2942 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2944 if (!sdp
->request_queue
->rq_timeout
) {
2945 if (sdp
->type
!= TYPE_MOD
)
2946 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2948 blk_queue_rq_timeout(sdp
->request_queue
,
2952 device_initialize(&sdkp
->dev
);
2953 sdkp
->dev
.parent
= dev
;
2954 sdkp
->dev
.class = &sd_disk_class
;
2955 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
2957 if (device_add(&sdkp
->dev
))
2958 goto out_free_index
;
2961 dev_set_drvdata(dev
, sdkp
);
2963 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2964 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2969 spin_lock(&sd_index_lock
);
2970 ida_remove(&sd_index_ida
, index
);
2971 spin_unlock(&sd_index_lock
);
2981 * sd_remove - called whenever a scsi disk (previously recognized by
2982 * sd_probe) is detached from the system. It is called (potentially
2983 * multiple times) during sd module unload.
2984 * @sdp: pointer to mid level scsi device object
2986 * Note: this function is invoked from the scsi mid-level.
2987 * This function potentially frees up a device name (e.g. /dev/sdc)
2988 * that could be re-used by a subsequent sd_probe().
2989 * This function is not called when the built-in sd driver is "exit-ed".
2991 static int sd_remove(struct device
*dev
)
2993 struct scsi_disk
*sdkp
;
2996 sdkp
= dev_get_drvdata(dev
);
2997 devt
= disk_devt(sdkp
->disk
);
2998 scsi_autopm_get_device(sdkp
->device
);
3000 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3001 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
3002 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
3003 device_del(&sdkp
->dev
);
3004 del_gendisk(sdkp
->disk
);
3007 blk_register_region(devt
, SD_MINORS
, NULL
,
3008 sd_default_probe
, NULL
, NULL
);
3010 mutex_lock(&sd_ref_mutex
);
3011 dev_set_drvdata(dev
, NULL
);
3012 put_device(&sdkp
->dev
);
3013 mutex_unlock(&sd_ref_mutex
);
3019 * scsi_disk_release - Called to free the scsi_disk structure
3020 * @dev: pointer to embedded class device
3022 * sd_ref_mutex must be held entering this routine. Because it is
3023 * called on last put, you should always use the scsi_disk_get()
3024 * scsi_disk_put() helpers which manipulate the semaphore directly
3025 * and never do a direct put_device.
3027 static void scsi_disk_release(struct device
*dev
)
3029 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3030 struct gendisk
*disk
= sdkp
->disk
;
3032 spin_lock(&sd_index_lock
);
3033 ida_remove(&sd_index_ida
, sdkp
->index
);
3034 spin_unlock(&sd_index_lock
);
3036 disk
->private_data
= NULL
;
3038 put_device(&sdkp
->device
->sdev_gendev
);
3043 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3045 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3046 struct scsi_sense_hdr sshdr
;
3047 struct scsi_device
*sdp
= sdkp
->device
;
3051 cmd
[4] |= 1; /* START */
3053 if (sdp
->start_stop_pwr_cond
)
3054 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3056 if (!scsi_device_online(sdp
))
3059 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3060 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, REQ_PM
);
3062 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
3063 sd_print_result(sdkp
, res
);
3064 if (driver_byte(res
) & DRIVER_SENSE
)
3065 sd_print_sense_hdr(sdkp
, &sshdr
);
3072 * Send a SYNCHRONIZE CACHE instruction down to the device through
3073 * the normal SCSI command structure. Wait for the command to
3076 static void sd_shutdown(struct device
*dev
)
3078 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3081 return; /* this can happen */
3083 if (pm_runtime_suspended(dev
))
3087 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3088 sd_sync_cache(sdkp
);
3091 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3092 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3093 sd_start_stop_device(sdkp
, 0);
3097 scsi_disk_put(sdkp
);
3100 static int sd_suspend(struct device
*dev
)
3102 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3105 if (!sdkp
) /* E.g.: runtime suspend following sd_remove() */
3109 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3110 ret
= sd_sync_cache(sdkp
);
3115 if (sdkp
->device
->manage_start_stop
) {
3116 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3117 ret
= sd_start_stop_device(sdkp
, 0);
3121 scsi_disk_put(sdkp
);
3125 static int sd_resume(struct device
*dev
)
3127 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3130 if (!sdkp
) /* E.g.: runtime resume at the start of sd_probe() */
3133 if (!sdkp
->device
->manage_start_stop
)
3136 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3137 ret
= sd_start_stop_device(sdkp
, 1);
3140 scsi_disk_put(sdkp
);
3145 * init_sd - entry point for this driver (both when built in or when
3148 * Note: this function registers this driver with the scsi mid-level.
3150 static int __init
init_sd(void)
3152 int majors
= 0, i
, err
;
3154 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3156 for (i
= 0; i
< SD_MAJORS
; i
++) {
3157 if (register_blkdev(sd_major(i
), "sd") != 0)
3160 blk_register_region(sd_major(i
), SD_MINORS
, NULL
,
3161 sd_default_probe
, NULL
, NULL
);
3167 err
= class_register(&sd_disk_class
);
3171 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3173 if (!sd_cdb_cache
) {
3174 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3178 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3180 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3184 err
= scsi_register_driver(&sd_template
.gendrv
);
3186 goto err_out_driver
;
3191 mempool_destroy(sd_cdb_pool
);
3194 kmem_cache_destroy(sd_cdb_cache
);
3197 class_unregister(&sd_disk_class
);
3199 for (i
= 0; i
< SD_MAJORS
; i
++)
3200 unregister_blkdev(sd_major(i
), "sd");
3205 * exit_sd - exit point for this driver (when it is a module).
3207 * Note: this function unregisters this driver from the scsi mid-level.
3209 static void __exit
exit_sd(void)
3213 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3215 scsi_unregister_driver(&sd_template
.gendrv
);
3216 mempool_destroy(sd_cdb_pool
);
3217 kmem_cache_destroy(sd_cdb_cache
);
3219 class_unregister(&sd_disk_class
);
3221 for (i
= 0; i
< SD_MAJORS
; i
++) {
3222 blk_unregister_region(sd_major(i
), SD_MINORS
);
3223 unregister_blkdev(sd_major(i
), "sd");
3227 module_init(init_sd
);
3228 module_exit(exit_sd
);
3230 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3231 struct scsi_sense_hdr
*sshdr
)
3233 sd_printk(KERN_INFO
, sdkp
, " ");
3234 scsi_show_sense_hdr(sshdr
);
3235 sd_printk(KERN_INFO
, sdkp
, " ");
3236 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3239 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3241 sd_printk(KERN_INFO
, sdkp
, " ");
3242 scsi_show_result(result
);