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_init_command(struct scsi_cmnd
*SCpnt
);
113 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
);
114 static int sd_done(struct scsi_cmnd
*);
115 static int sd_eh_action(struct scsi_cmnd
*, int);
116 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
117 static void scsi_disk_release(struct device
*cdev
);
118 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
119 static void sd_print_result(struct scsi_disk
*, int);
121 static DEFINE_SPINLOCK(sd_index_lock
);
122 static DEFINE_IDA(sd_index_ida
);
124 /* This semaphore is used to mediate the 0->1 reference get in the
125 * face of object destruction (i.e. we can't allow a get on an
126 * object after last put) */
127 static DEFINE_MUTEX(sd_ref_mutex
);
129 static struct kmem_cache
*sd_cdb_cache
;
130 static mempool_t
*sd_cdb_pool
;
132 static const char *sd_cache_types
[] = {
133 "write through", "none", "write back",
134 "write back, no read (daft)"
138 cache_type_store(struct device
*dev
, struct device_attribute
*attr
,
139 const char *buf
, size_t count
)
141 int i
, ct
= -1, rcd
, wce
, sp
;
142 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
143 struct scsi_device
*sdp
= sdkp
->device
;
146 struct scsi_mode_data data
;
147 struct scsi_sense_hdr sshdr
;
148 static const char temp
[] = "temporary ";
151 if (sdp
->type
!= TYPE_DISK
)
152 /* no cache control on RBC devices; theoretically they
153 * can do it, but there's probably so many exceptions
154 * it's not worth the risk */
157 if (strncmp(buf
, temp
, sizeof(temp
) - 1) == 0) {
158 buf
+= sizeof(temp
) - 1;
159 sdkp
->cache_override
= 1;
161 sdkp
->cache_override
= 0;
164 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
165 len
= strlen(sd_cache_types
[i
]);
166 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
174 rcd
= ct
& 0x01 ? 1 : 0;
175 wce
= ct
& 0x02 ? 1 : 0;
177 if (sdkp
->cache_override
) {
183 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
184 SD_MAX_RETRIES
, &data
, NULL
))
186 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
187 data
.block_descriptor_length
);
188 buffer_data
= buffer
+ data
.header_length
+
189 data
.block_descriptor_length
;
190 buffer_data
[2] &= ~0x05;
191 buffer_data
[2] |= wce
<< 2 | rcd
;
192 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
194 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
195 SD_MAX_RETRIES
, &data
, &sshdr
)) {
196 if (scsi_sense_valid(&sshdr
))
197 sd_print_sense_hdr(sdkp
, &sshdr
);
200 revalidate_disk(sdkp
->disk
);
205 manage_start_stop_show(struct device
*dev
, struct device_attribute
*attr
,
208 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
209 struct scsi_device
*sdp
= sdkp
->device
;
211 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
215 manage_start_stop_store(struct device
*dev
, struct device_attribute
*attr
,
216 const char *buf
, size_t count
)
218 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
219 struct scsi_device
*sdp
= sdkp
->device
;
221 if (!capable(CAP_SYS_ADMIN
))
224 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
228 static DEVICE_ATTR_RW(manage_start_stop
);
231 allow_restart_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
233 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
235 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
239 allow_restart_store(struct device
*dev
, struct device_attribute
*attr
,
240 const char *buf
, size_t count
)
242 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
243 struct scsi_device
*sdp
= sdkp
->device
;
245 if (!capable(CAP_SYS_ADMIN
))
248 if (sdp
->type
!= TYPE_DISK
)
251 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
255 static DEVICE_ATTR_RW(allow_restart
);
258 cache_type_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
260 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
261 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
263 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
265 static DEVICE_ATTR_RW(cache_type
);
268 FUA_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
270 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
272 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
274 static DEVICE_ATTR_RO(FUA
);
277 protection_type_show(struct device
*dev
, struct device_attribute
*attr
,
280 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
282 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
286 protection_type_store(struct device
*dev
, struct device_attribute
*attr
,
287 const char *buf
, size_t count
)
289 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
293 if (!capable(CAP_SYS_ADMIN
))
296 err
= kstrtouint(buf
, 10, &val
);
301 if (val
>= 0 && val
<= SD_DIF_TYPE3_PROTECTION
)
302 sdkp
->protection_type
= val
;
306 static DEVICE_ATTR_RW(protection_type
);
309 protection_mode_show(struct device
*dev
, struct device_attribute
*attr
,
312 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
313 struct scsi_device
*sdp
= sdkp
->device
;
314 unsigned int dif
, dix
;
316 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
317 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
319 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
325 return snprintf(buf
, 20, "none\n");
327 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
329 static DEVICE_ATTR_RO(protection_mode
);
332 app_tag_own_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
334 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
336 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
338 static DEVICE_ATTR_RO(app_tag_own
);
341 thin_provisioning_show(struct device
*dev
, struct device_attribute
*attr
,
344 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
346 return snprintf(buf
, 20, "%u\n", sdkp
->lbpme
);
348 static DEVICE_ATTR_RO(thin_provisioning
);
350 static const char *lbp_mode
[] = {
351 [SD_LBP_FULL
] = "full",
352 [SD_LBP_UNMAP
] = "unmap",
353 [SD_LBP_WS16
] = "writesame_16",
354 [SD_LBP_WS10
] = "writesame_10",
355 [SD_LBP_ZERO
] = "writesame_zero",
356 [SD_LBP_DISABLE
] = "disabled",
360 provisioning_mode_show(struct device
*dev
, struct device_attribute
*attr
,
363 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
365 return snprintf(buf
, 20, "%s\n", lbp_mode
[sdkp
->provisioning_mode
]);
369 provisioning_mode_store(struct device
*dev
, struct device_attribute
*attr
,
370 const char *buf
, size_t count
)
372 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
373 struct scsi_device
*sdp
= sdkp
->device
;
375 if (!capable(CAP_SYS_ADMIN
))
378 if (sdp
->type
!= TYPE_DISK
)
381 if (!strncmp(buf
, lbp_mode
[SD_LBP_UNMAP
], 20))
382 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
383 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS16
], 20))
384 sd_config_discard(sdkp
, SD_LBP_WS16
);
385 else if (!strncmp(buf
, lbp_mode
[SD_LBP_WS10
], 20))
386 sd_config_discard(sdkp
, SD_LBP_WS10
);
387 else if (!strncmp(buf
, lbp_mode
[SD_LBP_ZERO
], 20))
388 sd_config_discard(sdkp
, SD_LBP_ZERO
);
389 else if (!strncmp(buf
, lbp_mode
[SD_LBP_DISABLE
], 20))
390 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
396 static DEVICE_ATTR_RW(provisioning_mode
);
399 max_medium_access_timeouts_show(struct device
*dev
,
400 struct device_attribute
*attr
, char *buf
)
402 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
404 return snprintf(buf
, 20, "%u\n", sdkp
->max_medium_access_timeouts
);
408 max_medium_access_timeouts_store(struct device
*dev
,
409 struct device_attribute
*attr
, const char *buf
,
412 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
415 if (!capable(CAP_SYS_ADMIN
))
418 err
= kstrtouint(buf
, 10, &sdkp
->max_medium_access_timeouts
);
420 return err
? err
: count
;
422 static DEVICE_ATTR_RW(max_medium_access_timeouts
);
425 max_write_same_blocks_show(struct device
*dev
, struct device_attribute
*attr
,
428 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
430 return snprintf(buf
, 20, "%u\n", sdkp
->max_ws_blocks
);
434 max_write_same_blocks_store(struct device
*dev
, struct device_attribute
*attr
,
435 const char *buf
, size_t count
)
437 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
438 struct scsi_device
*sdp
= sdkp
->device
;
442 if (!capable(CAP_SYS_ADMIN
))
445 if (sdp
->type
!= TYPE_DISK
)
448 err
= kstrtoul(buf
, 10, &max
);
454 sdp
->no_write_same
= 1;
455 else if (max
<= SD_MAX_WS16_BLOCKS
) {
456 sdp
->no_write_same
= 0;
457 sdkp
->max_ws_blocks
= max
;
460 sd_config_write_same(sdkp
);
464 static DEVICE_ATTR_RW(max_write_same_blocks
);
466 static struct attribute
*sd_disk_attrs
[] = {
467 &dev_attr_cache_type
.attr
,
469 &dev_attr_allow_restart
.attr
,
470 &dev_attr_manage_start_stop
.attr
,
471 &dev_attr_protection_type
.attr
,
472 &dev_attr_protection_mode
.attr
,
473 &dev_attr_app_tag_own
.attr
,
474 &dev_attr_thin_provisioning
.attr
,
475 &dev_attr_provisioning_mode
.attr
,
476 &dev_attr_max_write_same_blocks
.attr
,
477 &dev_attr_max_medium_access_timeouts
.attr
,
480 ATTRIBUTE_GROUPS(sd_disk
);
482 static struct class sd_disk_class
= {
484 .owner
= THIS_MODULE
,
485 .dev_release
= scsi_disk_release
,
486 .dev_groups
= sd_disk_groups
,
489 static const struct dev_pm_ops sd_pm_ops
= {
490 .suspend
= sd_suspend_system
,
492 .poweroff
= sd_suspend_system
,
493 .restore
= sd_resume
,
494 .runtime_suspend
= sd_suspend_runtime
,
495 .runtime_resume
= sd_resume
,
498 static struct scsi_driver sd_template
= {
499 .owner
= THIS_MODULE
,
504 .shutdown
= sd_shutdown
,
508 .init_command
= sd_init_command
,
509 .uninit_command
= sd_uninit_command
,
511 .eh_action
= sd_eh_action
,
515 * Dummy kobj_map->probe function.
516 * The default ->probe function will call modprobe, which is
517 * pointless as this module is already loaded.
519 static struct kobject
*sd_default_probe(dev_t devt
, int *partno
, void *data
)
525 * Device no to disk mapping:
527 * major disc2 disc p1
528 * |............|.............|....|....| <- dev_t
531 * Inside a major, we have 16k disks, however mapped non-
532 * contiguously. The first 16 disks are for major0, the next
533 * ones with major1, ... Disk 256 is for major0 again, disk 272
535 * As we stay compatible with our numbering scheme, we can reuse
536 * the well-know SCSI majors 8, 65--71, 136--143.
538 static int sd_major(int major_idx
)
542 return SCSI_DISK0_MAJOR
;
544 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
546 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
549 return 0; /* shut up gcc */
553 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
555 struct scsi_disk
*sdkp
= NULL
;
557 if (disk
->private_data
) {
558 sdkp
= scsi_disk(disk
);
559 if (scsi_device_get(sdkp
->device
) == 0)
560 get_device(&sdkp
->dev
);
567 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
569 struct scsi_disk
*sdkp
;
571 mutex_lock(&sd_ref_mutex
);
572 sdkp
= __scsi_disk_get(disk
);
573 mutex_unlock(&sd_ref_mutex
);
577 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
579 struct scsi_disk
*sdkp
;
581 mutex_lock(&sd_ref_mutex
);
582 sdkp
= dev_get_drvdata(dev
);
584 sdkp
= __scsi_disk_get(sdkp
->disk
);
585 mutex_unlock(&sd_ref_mutex
);
589 static void scsi_disk_put(struct scsi_disk
*sdkp
)
591 struct scsi_device
*sdev
= sdkp
->device
;
593 mutex_lock(&sd_ref_mutex
);
594 put_device(&sdkp
->dev
);
595 scsi_device_put(sdev
);
596 mutex_unlock(&sd_ref_mutex
);
599 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
601 unsigned int prot_op
= SCSI_PROT_NORMAL
;
602 unsigned int dix
= scsi_prot_sg_count(scmd
);
604 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
606 prot_op
= SCSI_PROT_READ_PASS
;
607 else if (dif
&& !dix
)
608 prot_op
= SCSI_PROT_READ_STRIP
;
609 else if (!dif
&& dix
)
610 prot_op
= SCSI_PROT_READ_INSERT
;
613 prot_op
= SCSI_PROT_WRITE_PASS
;
614 else if (dif
&& !dix
)
615 prot_op
= SCSI_PROT_WRITE_INSERT
;
616 else if (!dif
&& dix
)
617 prot_op
= SCSI_PROT_WRITE_STRIP
;
620 scsi_set_prot_op(scmd
, prot_op
);
621 scsi_set_prot_type(scmd
, dif
);
624 static void sd_config_discard(struct scsi_disk
*sdkp
, unsigned int mode
)
626 struct request_queue
*q
= sdkp
->disk
->queue
;
627 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
628 unsigned int max_blocks
= 0;
630 q
->limits
.discard_zeroes_data
= sdkp
->lbprz
;
631 q
->limits
.discard_alignment
= sdkp
->unmap_alignment
*
633 q
->limits
.discard_granularity
=
634 max(sdkp
->physical_block_size
,
635 sdkp
->unmap_granularity
* logical_block_size
);
637 sdkp
->provisioning_mode
= mode
;
642 q
->limits
.max_discard_sectors
= 0;
643 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD
, q
);
647 max_blocks
= min_not_zero(sdkp
->max_unmap_blocks
,
648 (u32
)SD_MAX_WS16_BLOCKS
);
652 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
653 (u32
)SD_MAX_WS16_BLOCKS
);
657 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
658 (u32
)SD_MAX_WS10_BLOCKS
);
662 max_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
663 (u32
)SD_MAX_WS10_BLOCKS
);
664 q
->limits
.discard_zeroes_data
= 1;
668 q
->limits
.max_discard_sectors
= max_blocks
* (logical_block_size
>> 9);
669 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
673 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
674 * @sdp: scsi device to operate one
675 * @rq: Request to prepare
677 * Will issue either UNMAP or WRITE SAME(16) depending on preference
678 * indicated by target device.
680 static int sd_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
682 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
683 sector_t sector
= blk_rq_pos(rq
);
684 unsigned int nr_sectors
= blk_rq_sectors(rq
);
685 unsigned int nr_bytes
= blk_rq_bytes(rq
);
691 sector
>>= ilog2(sdp
->sector_size
) - 9;
692 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
693 rq
->timeout
= SD_TIMEOUT
;
695 memset(rq
->cmd
, 0, rq
->cmd_len
);
697 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
699 return BLKPREP_DEFER
;
701 switch (sdkp
->provisioning_mode
) {
703 buf
= page_address(page
);
709 put_unaligned_be16(6 + 16, &buf
[0]);
710 put_unaligned_be16(16, &buf
[2]);
711 put_unaligned_be64(sector
, &buf
[8]);
712 put_unaligned_be32(nr_sectors
, &buf
[16]);
719 rq
->cmd
[0] = WRITE_SAME_16
;
720 rq
->cmd
[1] = 0x8; /* UNMAP */
721 put_unaligned_be64(sector
, &rq
->cmd
[2]);
722 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
724 len
= sdkp
->device
->sector_size
;
730 rq
->cmd
[0] = WRITE_SAME
;
731 if (sdkp
->provisioning_mode
== SD_LBP_WS10
)
732 rq
->cmd
[1] = 0x8; /* UNMAP */
733 put_unaligned_be32(sector
, &rq
->cmd
[2]);
734 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
736 len
= sdkp
->device
->sector_size
;
744 rq
->completion_data
= page
;
745 blk_add_request_payload(rq
, page
, len
);
746 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
747 rq
->__data_len
= nr_bytes
;
750 if (ret
!= BLKPREP_OK
)
755 static void sd_config_write_same(struct scsi_disk
*sdkp
)
757 struct request_queue
*q
= sdkp
->disk
->queue
;
758 unsigned int logical_block_size
= sdkp
->device
->sector_size
;
760 if (sdkp
->device
->no_write_same
) {
761 sdkp
->max_ws_blocks
= 0;
765 /* Some devices can not handle block counts above 0xffff despite
766 * supporting WRITE SAME(16). Consequently we default to 64k
767 * blocks per I/O unless the device explicitly advertises a
770 if (sdkp
->max_ws_blocks
> SD_MAX_WS10_BLOCKS
)
771 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
772 (u32
)SD_MAX_WS16_BLOCKS
);
773 else if (sdkp
->ws16
|| sdkp
->ws10
|| sdkp
->device
->no_report_opcodes
)
774 sdkp
->max_ws_blocks
= min_not_zero(sdkp
->max_ws_blocks
,
775 (u32
)SD_MAX_WS10_BLOCKS
);
777 sdkp
->device
->no_write_same
= 1;
778 sdkp
->max_ws_blocks
= 0;
782 blk_queue_max_write_same_sectors(q
, sdkp
->max_ws_blocks
*
783 (logical_block_size
>> 9));
787 * sd_setup_write_same_cmnd - write the same data to multiple blocks
788 * @sdp: scsi device to operate one
789 * @rq: Request to prepare
791 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
792 * preference indicated by target device.
794 static int sd_setup_write_same_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
796 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
797 struct bio
*bio
= rq
->bio
;
798 sector_t sector
= blk_rq_pos(rq
);
799 unsigned int nr_sectors
= blk_rq_sectors(rq
);
800 unsigned int nr_bytes
= blk_rq_bytes(rq
);
803 if (sdkp
->device
->no_write_same
)
806 BUG_ON(bio_offset(bio
) || bio_iovec(bio
).bv_len
!= sdp
->sector_size
);
808 sector
>>= ilog2(sdp
->sector_size
) - 9;
809 nr_sectors
>>= ilog2(sdp
->sector_size
) - 9;
811 rq
->__data_len
= sdp
->sector_size
;
812 rq
->timeout
= SD_WRITE_SAME_TIMEOUT
;
813 memset(rq
->cmd
, 0, rq
->cmd_len
);
815 if (sdkp
->ws16
|| sector
> 0xffffffff || nr_sectors
> 0xffff) {
817 rq
->cmd
[0] = WRITE_SAME_16
;
818 put_unaligned_be64(sector
, &rq
->cmd
[2]);
819 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
822 rq
->cmd
[0] = WRITE_SAME
;
823 put_unaligned_be32(sector
, &rq
->cmd
[2]);
824 put_unaligned_be16(nr_sectors
, &rq
->cmd
[7]);
827 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
828 rq
->__data_len
= nr_bytes
;
833 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
835 rq
->timeout
*= SD_FLUSH_TIMEOUT_MULTIPLIER
;
836 rq
->retries
= SD_MAX_RETRIES
;
837 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
840 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
843 static void sd_uninit_command(struct scsi_cmnd
*SCpnt
)
845 struct request
*rq
= SCpnt
->request
;
847 if (rq
->cmd_flags
& REQ_DISCARD
)
848 __free_page(rq
->completion_data
);
850 if (SCpnt
->cmnd
!= rq
->cmd
) {
851 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
857 static int sd_init_command(struct scsi_cmnd
*SCpnt
)
859 struct request
*rq
= SCpnt
->request
;
860 struct scsi_device
*sdp
= SCpnt
->device
;
861 struct gendisk
*disk
= rq
->rq_disk
;
862 struct scsi_disk
*sdkp
;
863 sector_t block
= blk_rq_pos(rq
);
865 unsigned int this_count
= blk_rq_sectors(rq
);
867 unsigned char protect
;
870 * Discard request come in as REQ_TYPE_FS but we turn them into
871 * block PC requests to make life easier.
873 if (rq
->cmd_flags
& REQ_DISCARD
) {
874 ret
= sd_setup_discard_cmnd(sdp
, rq
);
876 } else if (rq
->cmd_flags
& REQ_WRITE_SAME
) {
877 ret
= sd_setup_write_same_cmnd(sdp
, rq
);
879 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
880 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
883 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
884 if (ret
!= BLKPREP_OK
)
887 sdkp
= scsi_disk(disk
);
889 /* from here on until we're complete, any goto out
890 * is used for a killable error condition */
894 scmd_printk(KERN_INFO
, SCpnt
,
895 "%s: block=%llu, count=%d\n",
896 __func__
, (unsigned long long)block
, this_count
));
898 if (!sdp
|| !scsi_device_online(sdp
) ||
899 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
900 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
901 "Finishing %u sectors\n",
902 blk_rq_sectors(rq
)));
903 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
904 "Retry with 0x%p\n", SCpnt
));
910 * quietly refuse to do anything to a changed disc until
911 * the changed bit has been reset
913 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
918 * Some SD card readers can't handle multi-sector accesses which touch
919 * the last one or two hardware sectors. Split accesses as needed.
921 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
922 (sdp
->sector_size
/ 512);
924 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
925 if (block
< threshold
) {
926 /* Access up to the threshold but not beyond */
927 this_count
= threshold
- block
;
929 /* Access only a single hardware sector */
930 this_count
= sdp
->sector_size
/ 512;
934 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
935 (unsigned long long)block
));
938 * If we have a 1K hardware sectorsize, prevent access to single
939 * 512 byte sectors. In theory we could handle this - in fact
940 * the scsi cdrom driver must be able to handle this because
941 * we typically use 1K blocksizes, and cdroms typically have
942 * 2K hardware sectorsizes. Of course, things are simpler
943 * with the cdrom, since it is read-only. For performance
944 * reasons, the filesystems should be able to handle this
945 * and not force the scsi disk driver to use bounce buffers
948 if (sdp
->sector_size
== 1024) {
949 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
950 scmd_printk(KERN_ERR
, SCpnt
,
951 "Bad block number requested\n");
955 this_count
= this_count
>> 1;
958 if (sdp
->sector_size
== 2048) {
959 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
960 scmd_printk(KERN_ERR
, SCpnt
,
961 "Bad block number requested\n");
965 this_count
= this_count
>> 2;
968 if (sdp
->sector_size
== 4096) {
969 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
970 scmd_printk(KERN_ERR
, SCpnt
,
971 "Bad block number requested\n");
975 this_count
= this_count
>> 3;
978 if (rq_data_dir(rq
) == WRITE
) {
979 if (!sdp
->writeable
) {
982 SCpnt
->cmnd
[0] = WRITE_6
;
983 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
985 if (blk_integrity_rq(rq
))
986 sd_dif_prepare(rq
, block
, sdp
->sector_size
);
988 } else if (rq_data_dir(rq
) == READ
) {
989 SCpnt
->cmnd
[0] = READ_6
;
990 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
992 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %llx\n", (unsigned long long) rq
->cmd_flags
);
996 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
997 "%s %d/%u 512 byte blocks.\n",
998 (rq_data_dir(rq
) == WRITE
) ?
999 "writing" : "reading", this_count
,
1000 blk_rq_sectors(rq
)));
1002 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1003 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
1009 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
1010 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
1012 if (unlikely(SCpnt
->cmnd
== NULL
)) {
1013 ret
= BLKPREP_DEFER
;
1017 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
1018 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
1019 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
1020 SCpnt
->cmnd
[7] = 0x18;
1021 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
1022 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1025 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1026 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1027 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1028 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1029 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
1030 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
1031 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
1032 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
1034 /* Expected Indirect LBA */
1035 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
1036 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
1037 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
1038 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
1040 /* Transfer length */
1041 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
1042 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
1043 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
1044 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
1045 } else if (sdp
->use_16_for_rw
) {
1046 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
1047 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1048 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
1049 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
1050 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
1051 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
1052 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
1053 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
1054 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
1055 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
1056 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
1057 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
1058 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
1059 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
1060 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
1061 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
1062 scsi_device_protection(SCpnt
->device
) ||
1063 SCpnt
->device
->use_10_for_rw
) {
1064 if (this_count
> 0xffff)
1065 this_count
= 0xffff;
1067 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
1068 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
1069 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
1070 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
1071 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
1072 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
1073 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
1074 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
1075 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
1077 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
1079 * This happens only if this drive failed
1080 * 10byte rw command with ILLEGAL_REQUEST
1081 * during operation and thus turned off
1084 scmd_printk(KERN_ERR
, SCpnt
,
1085 "FUA write on READ/WRITE(6) drive\n");
1089 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
1090 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
1091 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
1092 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
1095 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
1097 /* If DIF or DIX is enabled, tell HBA how to handle request */
1098 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
1099 sd_prot_op(SCpnt
, host_dif
);
1102 * We shouldn't disconnect in the middle of a sector, so with a dumb
1103 * host adapter, it's safe to assume that we can at least transfer
1104 * this many bytes between each connect / disconnect.
1106 SCpnt
->transfersize
= sdp
->sector_size
;
1107 SCpnt
->underflow
= this_count
<< 9;
1108 SCpnt
->allowed
= SD_MAX_RETRIES
;
1111 * This indicates that the command is ready from our end to be
1120 * sd_open - open a scsi disk device
1121 * @inode: only i_rdev member may be used
1122 * @filp: only f_mode and f_flags may be used
1124 * Returns 0 if successful. Returns a negated errno value in case
1127 * Note: This can be called from a user context (e.g. fsck(1) )
1128 * or from within the kernel (e.g. as a result of a mount(1) ).
1129 * In the latter case @inode and @filp carry an abridged amount
1130 * of information as noted above.
1132 * Locking: called with bdev->bd_mutex held.
1134 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
1136 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
1137 struct scsi_device
*sdev
;
1143 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
1145 sdev
= sdkp
->device
;
1148 * If the device is in error recovery, wait until it is done.
1149 * If the device is offline, then disallow any access to it.
1152 if (!scsi_block_when_processing_errors(sdev
))
1155 if (sdev
->removable
|| sdkp
->write_prot
)
1156 check_disk_change(bdev
);
1159 * If the drive is empty, just let the open fail.
1161 retval
= -ENOMEDIUM
;
1162 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
1166 * If the device has the write protect tab set, have the open fail
1167 * if the user expects to be able to write to the thing.
1170 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
1174 * It is possible that the disk changing stuff resulted in
1175 * the device being taken offline. If this is the case,
1176 * report this to the user, and don't pretend that the
1177 * open actually succeeded.
1180 if (!scsi_device_online(sdev
))
1183 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
1184 if (scsi_block_when_processing_errors(sdev
))
1185 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
1191 scsi_disk_put(sdkp
);
1196 * sd_release - invoked when the (last) close(2) is called on this
1198 * @inode: only i_rdev member may be used
1199 * @filp: only f_mode and f_flags may be used
1203 * Note: may block (uninterruptible) if error recovery is underway
1206 * Locking: called with bdev->bd_mutex held.
1208 static void sd_release(struct gendisk
*disk
, fmode_t mode
)
1210 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1211 struct scsi_device
*sdev
= sdkp
->device
;
1213 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
1215 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
1216 if (scsi_block_when_processing_errors(sdev
))
1217 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
1221 * XXX and what if there are packets in flight and this close()
1222 * XXX is followed by a "rmmod sd_mod"?
1225 scsi_disk_put(sdkp
);
1228 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
1230 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
1231 struct scsi_device
*sdp
= sdkp
->device
;
1232 struct Scsi_Host
*host
= sdp
->host
;
1235 /* default to most commonly used values */
1236 diskinfo
[0] = 0x40; /* 1 << 6 */
1237 diskinfo
[1] = 0x20; /* 1 << 5 */
1238 diskinfo
[2] = sdkp
->capacity
>> 11;
1240 /* override with calculated, extended default, or driver values */
1241 if (host
->hostt
->bios_param
)
1242 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
1244 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
1246 geo
->heads
= diskinfo
[0];
1247 geo
->sectors
= diskinfo
[1];
1248 geo
->cylinders
= diskinfo
[2];
1253 * sd_ioctl - process an ioctl
1254 * @inode: only i_rdev/i_bdev members may be used
1255 * @filp: only f_mode and f_flags may be used
1256 * @cmd: ioctl command number
1257 * @arg: this is third argument given to ioctl(2) system call.
1258 * Often contains a pointer.
1260 * Returns 0 if successful (some ioctls return positive numbers on
1261 * success as well). Returns a negated errno value in case of error.
1263 * Note: most ioctls are forward onto the block subsystem or further
1264 * down in the scsi subsystem.
1266 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1267 unsigned int cmd
, unsigned long arg
)
1269 struct gendisk
*disk
= bdev
->bd_disk
;
1270 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1271 struct scsi_device
*sdp
= sdkp
->device
;
1272 void __user
*p
= (void __user
*)arg
;
1275 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO
, sdkp
, "sd_ioctl: disk=%s, "
1276 "cmd=0x%x\n", disk
->disk_name
, cmd
));
1278 error
= scsi_verify_blk_ioctl(bdev
, cmd
);
1283 * If we are in the middle of error recovery, don't let anyone
1284 * else try and use this device. Also, if error recovery fails, it
1285 * may try and take the device offline, in which case all further
1286 * access to the device is prohibited.
1288 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
1289 (mode
& FMODE_NDELAY
) != 0);
1290 if (!scsi_block_when_processing_errors(sdp
) || !error
)
1294 * Send SCSI addressing ioctls directly to mid level, send other
1295 * ioctls to block level and then onto mid level if they can't be
1299 case SCSI_IOCTL_GET_IDLUN
:
1300 case SCSI_IOCTL_GET_BUS_NUMBER
:
1301 error
= scsi_ioctl(sdp
, cmd
, p
);
1304 error
= scsi_cmd_blk_ioctl(bdev
, mode
, cmd
, p
);
1305 if (error
!= -ENOTTY
)
1307 error
= scsi_ioctl(sdp
, cmd
, p
);
1314 static void set_media_not_present(struct scsi_disk
*sdkp
)
1316 if (sdkp
->media_present
)
1317 sdkp
->device
->changed
= 1;
1319 if (sdkp
->device
->removable
) {
1320 sdkp
->media_present
= 0;
1325 static int media_not_present(struct scsi_disk
*sdkp
,
1326 struct scsi_sense_hdr
*sshdr
)
1328 if (!scsi_sense_valid(sshdr
))
1331 /* not invoked for commands that could return deferred errors */
1332 switch (sshdr
->sense_key
) {
1333 case UNIT_ATTENTION
:
1335 /* medium not present */
1336 if (sshdr
->asc
== 0x3A) {
1337 set_media_not_present(sdkp
);
1345 * sd_check_events - check media events
1346 * @disk: kernel device descriptor
1347 * @clearing: disk events currently being cleared
1349 * Returns mask of DISK_EVENT_*.
1351 * Note: this function is invoked from the block subsystem.
1353 static unsigned int sd_check_events(struct gendisk
*disk
, unsigned int clearing
)
1355 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1356 struct scsi_device
*sdp
= sdkp
->device
;
1357 struct scsi_sense_hdr
*sshdr
= NULL
;
1360 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_check_events\n"));
1363 * If the device is offline, don't send any commands - just pretend as
1364 * if the command failed. If the device ever comes back online, we
1365 * can deal with it then. It is only because of unrecoverable errors
1366 * that we would ever take a device offline in the first place.
1368 if (!scsi_device_online(sdp
)) {
1369 set_media_not_present(sdkp
);
1374 * Using TEST_UNIT_READY enables differentiation between drive with
1375 * no cartridge loaded - NOT READY, drive with changed cartridge -
1376 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1378 * Drives that auto spin down. eg iomega jaz 1G, will be started
1379 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1380 * sd_revalidate() is called.
1384 if (scsi_block_when_processing_errors(sdp
)) {
1385 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1386 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1390 /* failed to execute TUR, assume media not present */
1391 if (host_byte(retval
)) {
1392 set_media_not_present(sdkp
);
1396 if (media_not_present(sdkp
, sshdr
))
1400 * For removable scsi disk we have to recognise the presence
1401 * of a disk in the drive.
1403 if (!sdkp
->media_present
)
1405 sdkp
->media_present
= 1;
1408 * sdp->changed is set under the following conditions:
1410 * Medium present state has changed in either direction.
1411 * Device has indicated UNIT_ATTENTION.
1414 retval
= sdp
->changed
? DISK_EVENT_MEDIA_CHANGE
: 0;
1419 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1422 struct scsi_device
*sdp
= sdkp
->device
;
1423 const int timeout
= sdp
->request_queue
->rq_timeout
1424 * SD_FLUSH_TIMEOUT_MULTIPLIER
;
1425 struct scsi_sense_hdr sshdr
;
1427 if (!scsi_device_online(sdp
))
1430 for (retries
= 3; retries
> 0; --retries
) {
1431 unsigned char cmd
[10] = { 0 };
1433 cmd
[0] = SYNCHRONIZE_CACHE
;
1435 * Leave the rest of the command zero to indicate
1438 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0,
1439 &sshdr
, timeout
, SD_MAX_RETRIES
,
1446 sd_print_result(sdkp
, res
);
1448 if (driver_byte(res
) & DRIVER_SENSE
)
1449 sd_print_sense_hdr(sdkp
, &sshdr
);
1450 /* we need to evaluate the error return */
1451 if (scsi_sense_valid(&sshdr
) &&
1452 (sshdr
.asc
== 0x3a || /* medium not present */
1453 sshdr
.asc
== 0x20)) /* invalid command */
1454 /* this is no error here */
1457 switch (host_byte(res
)) {
1458 /* ignore errors due to racing a disconnection */
1459 case DID_BAD_TARGET
:
1460 case DID_NO_CONNECT
:
1462 /* signal the upper layer it might try again */
1466 case DID_SOFT_ERROR
:
1475 static void sd_rescan(struct device
*dev
)
1477 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1480 revalidate_disk(sdkp
->disk
);
1481 scsi_disk_put(sdkp
);
1486 #ifdef CONFIG_COMPAT
1488 * This gets directly called from VFS. When the ioctl
1489 * is not recognized we go back to the other translation paths.
1491 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1492 unsigned int cmd
, unsigned long arg
)
1494 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1497 ret
= scsi_verify_blk_ioctl(bdev
, cmd
);
1502 * If we are in the middle of error recovery, don't let anyone
1503 * else try and use this device. Also, if error recovery fails, it
1504 * may try and take the device offline, in which case all further
1505 * access to the device is prohibited.
1507 if (!scsi_block_when_processing_errors(sdev
))
1510 if (sdev
->host
->hostt
->compat_ioctl
) {
1511 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1517 * Let the static ioctl translation table take care of it.
1519 return -ENOIOCTLCMD
;
1523 static const struct block_device_operations sd_fops
= {
1524 .owner
= THIS_MODULE
,
1526 .release
= sd_release
,
1528 .getgeo
= sd_getgeo
,
1529 #ifdef CONFIG_COMPAT
1530 .compat_ioctl
= sd_compat_ioctl
,
1532 .check_events
= sd_check_events
,
1533 .revalidate_disk
= sd_revalidate_disk
,
1534 .unlock_native_capacity
= sd_unlock_native_capacity
,
1538 * sd_eh_action - error handling callback
1539 * @scmd: sd-issued command that has failed
1540 * @eh_disp: The recovery disposition suggested by the midlayer
1542 * This function is called by the SCSI midlayer upon completion of an
1543 * error test command (currently TEST UNIT READY). The result of sending
1544 * the eh command is passed in eh_disp. We're looking for devices that
1545 * fail medium access commands but are OK with non access commands like
1546 * test unit ready (so wrongly see the device as having a successful
1549 static int sd_eh_action(struct scsi_cmnd
*scmd
, int eh_disp
)
1551 struct scsi_disk
*sdkp
= scsi_disk(scmd
->request
->rq_disk
);
1553 if (!scsi_device_online(scmd
->device
) ||
1554 !scsi_medium_access_command(scmd
) ||
1555 host_byte(scmd
->result
) != DID_TIME_OUT
||
1560 * The device has timed out executing a medium access command.
1561 * However, the TEST UNIT READY command sent during error
1562 * handling completed successfully. Either the device is in the
1563 * process of recovering or has it suffered an internal failure
1564 * that prevents access to the storage medium.
1566 sdkp
->medium_access_timed_out
++;
1569 * If the device keeps failing read/write commands but TEST UNIT
1570 * READY always completes successfully we assume that medium
1571 * access is no longer possible and take the device offline.
1573 if (sdkp
->medium_access_timed_out
>= sdkp
->max_medium_access_timeouts
) {
1574 scmd_printk(KERN_ERR
, scmd
,
1575 "Medium access timeout failure. Offlining disk!\n");
1576 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1584 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1586 u64 start_lba
= blk_rq_pos(scmd
->request
);
1587 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1591 * resid is optional but mostly filled in. When it's unused,
1592 * its value is zero, so we assume the whole buffer transferred
1594 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1595 unsigned int good_bytes
;
1597 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1600 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1601 SCSI_SENSE_BUFFERSIZE
,
1606 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1609 if (scmd
->device
->sector_size
< 512) {
1610 /* only legitimate sector_size here is 256 */
1614 /* be careful ... don't want any overflows */
1615 unsigned int factor
= scmd
->device
->sector_size
/ 512;
1616 do_div(start_lba
, factor
);
1617 do_div(end_lba
, factor
);
1620 /* The bad lba was reported incorrectly, we have no idea where
1623 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1626 /* This computation should always be done in terms of
1627 * the resolution of the device's medium.
1629 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1630 return min(good_bytes
, transferred
);
1634 * sd_done - bottom half handler: called when the lower level
1635 * driver has completed (successfully or otherwise) a scsi command.
1636 * @SCpnt: mid-level's per command structure.
1638 * Note: potentially run from within an ISR. Must not block.
1640 static int sd_done(struct scsi_cmnd
*SCpnt
)
1642 int result
= SCpnt
->result
;
1643 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1644 struct scsi_sense_hdr sshdr
;
1645 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1646 struct request
*req
= SCpnt
->request
;
1647 int sense_valid
= 0;
1648 int sense_deferred
= 0;
1649 unsigned char op
= SCpnt
->cmnd
[0];
1650 unsigned char unmap
= SCpnt
->cmnd
[1] & 8;
1652 if (req
->cmd_flags
& REQ_DISCARD
|| req
->cmd_flags
& REQ_WRITE_SAME
) {
1654 good_bytes
= blk_rq_bytes(req
);
1655 scsi_set_resid(SCpnt
, 0);
1658 scsi_set_resid(SCpnt
, blk_rq_bytes(req
));
1663 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1665 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1667 #ifdef CONFIG_SCSI_LOGGING
1668 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1670 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1671 "sd_done: sb[respc,sk,asc,"
1672 "ascq]=%x,%x,%x,%x\n",
1673 sshdr
.response_code
,
1674 sshdr
.sense_key
, sshdr
.asc
,
1678 sdkp
->medium_access_timed_out
= 0;
1680 if (driver_byte(result
) != DRIVER_SENSE
&&
1681 (!sense_valid
|| sense_deferred
))
1684 switch (sshdr
.sense_key
) {
1685 case HARDWARE_ERROR
:
1687 good_bytes
= sd_completed_bytes(SCpnt
);
1689 case RECOVERED_ERROR
:
1690 good_bytes
= scsi_bufflen(SCpnt
);
1693 /* This indicates a false check condition, so ignore it. An
1694 * unknown amount of data was transferred so treat it as an
1697 scsi_print_sense("sd", SCpnt
);
1699 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1701 case ABORTED_COMMAND
:
1702 if (sshdr
.asc
== 0x10) /* DIF: Target detected corruption */
1703 good_bytes
= sd_completed_bytes(SCpnt
);
1705 case ILLEGAL_REQUEST
:
1706 if (sshdr
.asc
== 0x10) /* DIX: Host detected corruption */
1707 good_bytes
= sd_completed_bytes(SCpnt
);
1708 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1709 if (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) {
1712 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1717 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
1719 sdkp
->device
->no_write_same
= 1;
1720 sd_config_write_same(sdkp
);
1723 req
->__data_len
= blk_rq_bytes(req
);
1724 req
->cmd_flags
|= REQ_QUIET
;
1733 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1734 sd_dif_complete(SCpnt
, good_bytes
);
1740 * spinup disk - called only in sd_revalidate_disk()
1743 sd_spinup_disk(struct scsi_disk
*sdkp
)
1745 unsigned char cmd
[10];
1746 unsigned long spintime_expire
= 0;
1747 int retries
, spintime
;
1748 unsigned int the_result
;
1749 struct scsi_sense_hdr sshdr
;
1750 int sense_valid
= 0;
1754 /* Spin up drives, as required. Only do this at boot time */
1755 /* Spinup needs to be done for module loads too. */
1760 cmd
[0] = TEST_UNIT_READY
;
1761 memset((void *) &cmd
[1], 0, 9);
1763 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1766 SD_MAX_RETRIES
, NULL
);
1769 * If the drive has indicated to us that it
1770 * doesn't have any media in it, don't bother
1771 * with any more polling.
1773 if (media_not_present(sdkp
, &sshdr
))
1777 sense_valid
= scsi_sense_valid(&sshdr
);
1779 } while (retries
< 3 &&
1780 (!scsi_status_is_good(the_result
) ||
1781 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1782 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1784 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1785 /* no sense, TUR either succeeded or failed
1786 * with a status error */
1787 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1788 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1789 sd_print_result(sdkp
, the_result
);
1795 * The device does not want the automatic start to be issued.
1797 if (sdkp
->device
->no_start_on_add
)
1800 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1801 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1802 break; /* manual intervention required */
1803 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1804 break; /* standby */
1805 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1806 break; /* unavailable */
1808 * Issue command to spin up drive when not ready
1811 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1812 cmd
[0] = START_STOP
;
1813 cmd
[1] = 1; /* Return immediately */
1814 memset((void *) &cmd
[2], 0, 8);
1815 cmd
[4] = 1; /* Start spin cycle */
1816 if (sdkp
->device
->start_stop_pwr_cond
)
1818 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1820 SD_TIMEOUT
, SD_MAX_RETRIES
,
1822 spintime_expire
= jiffies
+ 100 * HZ
;
1825 /* Wait 1 second for next try */
1830 * Wait for USB flash devices with slow firmware.
1831 * Yes, this sense key/ASC combination shouldn't
1832 * occur here. It's characteristic of these devices.
1834 } else if (sense_valid
&&
1835 sshdr
.sense_key
== UNIT_ATTENTION
&&
1836 sshdr
.asc
== 0x28) {
1838 spintime_expire
= jiffies
+ 5 * HZ
;
1841 /* Wait 1 second for next try */
1844 /* we don't understand the sense code, so it's
1845 * probably pointless to loop */
1847 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1848 sd_print_sense_hdr(sdkp
, &sshdr
);
1853 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1856 if (scsi_status_is_good(the_result
))
1859 printk("not responding...\n");
1865 * Determine whether disk supports Data Integrity Field.
1867 static int sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1869 struct scsi_device
*sdp
= sdkp
->device
;
1873 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1876 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1878 if (type
> SD_DIF_TYPE3_PROTECTION
)
1880 else if (scsi_host_dif_capable(sdp
->host
, type
))
1883 if (sdkp
->first_scan
|| type
!= sdkp
->protection_type
)
1886 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported" \
1887 " protection type %u. Disabling disk!\n",
1891 sd_printk(KERN_NOTICE
, sdkp
,
1892 "Enabling DIF Type %u protection\n", type
);
1895 sd_printk(KERN_NOTICE
, sdkp
,
1896 "Disabling DIF Type %u protection\n", type
);
1900 sdkp
->protection_type
= type
;
1905 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1906 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1909 sd_print_result(sdkp
, the_result
);
1910 if (driver_byte(the_result
) & DRIVER_SENSE
)
1911 sd_print_sense_hdr(sdkp
, sshdr
);
1913 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1916 * Set dirty bit for removable devices if not ready -
1917 * sometimes drives will not report this properly.
1919 if (sdp
->removable
&&
1920 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1921 set_media_not_present(sdkp
);
1924 * We used to set media_present to 0 here to indicate no media
1925 * in the drive, but some drives fail read capacity even with
1926 * media present, so we can't do that.
1928 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1932 #if RC16_LEN > SD_BUF_SIZE
1933 #error RC16_LEN must not be more than SD_BUF_SIZE
1936 #define READ_CAPACITY_RETRIES_ON_RESET 10
1938 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1939 unsigned char *buffer
)
1941 unsigned char cmd
[16];
1942 struct scsi_sense_hdr sshdr
;
1943 int sense_valid
= 0;
1945 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1946 unsigned int alignment
;
1947 unsigned long long lba
;
1948 unsigned sector_size
;
1950 if (sdp
->no_read_capacity_16
)
1955 cmd
[0] = SERVICE_ACTION_IN
;
1956 cmd
[1] = SAI_READ_CAPACITY_16
;
1958 memset(buffer
, 0, RC16_LEN
);
1960 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1961 buffer
, RC16_LEN
, &sshdr
,
1962 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1964 if (media_not_present(sdkp
, &sshdr
))
1968 sense_valid
= scsi_sense_valid(&sshdr
);
1970 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1971 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1973 /* Invalid Command Operation Code or
1974 * Invalid Field in CDB, just retry
1975 * silently with RC10 */
1978 sshdr
.sense_key
== UNIT_ATTENTION
&&
1979 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1980 /* Device reset might occur several times,
1981 * give it one more chance */
1982 if (--reset_retries
> 0)
1987 } while (the_result
&& retries
);
1990 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1991 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1995 sector_size
= get_unaligned_be32(&buffer
[8]);
1996 lba
= get_unaligned_be64(&buffer
[0]);
1998 if (sd_read_protection_type(sdkp
, buffer
) < 0) {
2003 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
2004 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2005 "kernel compiled with support for large block "
2011 /* Logical blocks per physical block exponent */
2012 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
2014 /* Lowest aligned logical block */
2015 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
2016 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
2017 if (alignment
&& sdkp
->first_scan
)
2018 sd_printk(KERN_NOTICE
, sdkp
,
2019 "physical block alignment offset: %u\n", alignment
);
2021 if (buffer
[14] & 0x80) { /* LBPME */
2024 if (buffer
[14] & 0x40) /* LBPRZ */
2027 sd_config_discard(sdkp
, SD_LBP_WS16
);
2030 sdkp
->capacity
= lba
+ 1;
2034 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
2035 unsigned char *buffer
)
2037 unsigned char cmd
[16];
2038 struct scsi_sense_hdr sshdr
;
2039 int sense_valid
= 0;
2041 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
2043 unsigned sector_size
;
2046 cmd
[0] = READ_CAPACITY
;
2047 memset(&cmd
[1], 0, 9);
2048 memset(buffer
, 0, 8);
2050 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
2052 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2054 if (media_not_present(sdkp
, &sshdr
))
2058 sense_valid
= scsi_sense_valid(&sshdr
);
2060 sshdr
.sense_key
== UNIT_ATTENTION
&&
2061 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
2062 /* Device reset might occur several times,
2063 * give it one more chance */
2064 if (--reset_retries
> 0)
2069 } while (the_result
&& retries
);
2072 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
2073 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
2077 sector_size
= get_unaligned_be32(&buffer
[4]);
2078 lba
= get_unaligned_be32(&buffer
[0]);
2080 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
2081 /* Some buggy (usb cardreader) devices return an lba of
2082 0xffffffff when the want to report a size of 0 (with
2083 which they really mean no media is present) */
2085 sdkp
->physical_block_size
= sector_size
;
2089 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
2090 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
2091 "kernel compiled with support for large block "
2097 sdkp
->capacity
= lba
+ 1;
2098 sdkp
->physical_block_size
= sector_size
;
2102 static int sd_try_rc16_first(struct scsi_device
*sdp
)
2104 if (sdp
->host
->max_cmd_len
< 16)
2106 if (sdp
->try_rc_10_first
)
2108 if (sdp
->scsi_level
> SCSI_SPC_2
)
2110 if (scsi_device_protection(sdp
))
2116 * read disk capacity
2119 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2122 struct scsi_device
*sdp
= sdkp
->device
;
2123 sector_t old_capacity
= sdkp
->capacity
;
2125 if (sd_try_rc16_first(sdp
)) {
2126 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2127 if (sector_size
== -EOVERFLOW
)
2129 if (sector_size
== -ENODEV
)
2131 if (sector_size
< 0)
2132 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2133 if (sector_size
< 0)
2136 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
2137 if (sector_size
== -EOVERFLOW
)
2139 if (sector_size
< 0)
2141 if ((sizeof(sdkp
->capacity
) > 4) &&
2142 (sdkp
->capacity
> 0xffffffffULL
)) {
2143 int old_sector_size
= sector_size
;
2144 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
2145 "Trying to use READ CAPACITY(16).\n");
2146 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
2147 if (sector_size
< 0) {
2148 sd_printk(KERN_NOTICE
, sdkp
,
2149 "Using 0xffffffff as device size\n");
2150 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
2151 sector_size
= old_sector_size
;
2157 /* Some devices are known to return the total number of blocks,
2158 * not the highest block number. Some devices have versions
2159 * which do this and others which do not. Some devices we might
2160 * suspect of doing this but we don't know for certain.
2162 * If we know the reported capacity is wrong, decrement it. If
2163 * we can only guess, then assume the number of blocks is even
2164 * (usually true but not always) and err on the side of lowering
2167 if (sdp
->fix_capacity
||
2168 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
2169 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
2170 "from its reported value: %llu\n",
2171 (unsigned long long) sdkp
->capacity
);
2176 if (sector_size
== 0) {
2178 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
2182 if (sector_size
!= 512 &&
2183 sector_size
!= 1024 &&
2184 sector_size
!= 2048 &&
2185 sector_size
!= 4096 &&
2186 sector_size
!= 256) {
2187 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
2190 * The user might want to re-format the drive with
2191 * a supported sectorsize. Once this happens, it
2192 * would be relatively trivial to set the thing up.
2193 * For this reason, we leave the thing in the table.
2197 * set a bogus sector size so the normal read/write
2198 * logic in the block layer will eventually refuse any
2199 * request on this device without tripping over power
2200 * of two sector size assumptions
2204 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
2207 char cap_str_2
[10], cap_str_10
[10];
2208 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
2210 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
2212 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
2213 sizeof(cap_str_10
));
2215 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
2216 sd_printk(KERN_NOTICE
, sdkp
,
2217 "%llu %d-byte logical blocks: (%s/%s)\n",
2218 (unsigned long long)sdkp
->capacity
,
2219 sector_size
, cap_str_10
, cap_str_2
);
2221 if (sdkp
->physical_block_size
!= sector_size
)
2222 sd_printk(KERN_NOTICE
, sdkp
,
2223 "%u-byte physical blocks\n",
2224 sdkp
->physical_block_size
);
2228 sdp
->use_16_for_rw
= (sdkp
->capacity
> 0xffffffff);
2230 /* Rescale capacity to 512-byte units */
2231 if (sector_size
== 4096)
2232 sdkp
->capacity
<<= 3;
2233 else if (sector_size
== 2048)
2234 sdkp
->capacity
<<= 2;
2235 else if (sector_size
== 1024)
2236 sdkp
->capacity
<<= 1;
2237 else if (sector_size
== 256)
2238 sdkp
->capacity
>>= 1;
2240 blk_queue_physical_block_size(sdp
->request_queue
,
2241 sdkp
->physical_block_size
);
2242 sdkp
->device
->sector_size
= sector_size
;
2245 /* called with buffer of length 512 */
2247 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
2248 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
2249 struct scsi_sense_hdr
*sshdr
)
2251 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2252 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
2257 * read write protect setting, if possible - called only in sd_revalidate_disk()
2258 * called with buffer of length SD_BUF_SIZE
2261 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2264 struct scsi_device
*sdp
= sdkp
->device
;
2265 struct scsi_mode_data data
;
2266 int old_wp
= sdkp
->write_prot
;
2268 set_disk_ro(sdkp
->disk
, 0);
2269 if (sdp
->skip_ms_page_3f
) {
2270 sd_first_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
2274 if (sdp
->use_192_bytes_for_3f
) {
2275 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
2278 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2279 * We have to start carefully: some devices hang if we ask
2280 * for more than is available.
2282 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
2285 * Second attempt: ask for page 0 When only page 0 is
2286 * implemented, a request for page 3F may return Sense Key
2287 * 5: Illegal Request, Sense Code 24: Invalid field in
2290 if (!scsi_status_is_good(res
))
2291 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
2294 * Third attempt: ask 255 bytes, as we did earlier.
2296 if (!scsi_status_is_good(res
))
2297 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
2301 if (!scsi_status_is_good(res
)) {
2302 sd_first_printk(KERN_WARNING
, sdkp
,
2303 "Test WP failed, assume Write Enabled\n");
2305 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
2306 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
2307 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
2308 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
2309 sdkp
->write_prot
? "on" : "off");
2310 sd_printk(KERN_DEBUG
, sdkp
,
2311 "Mode Sense: %02x %02x %02x %02x\n",
2312 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
2318 * sd_read_cache_type - called only from sd_revalidate_disk()
2319 * called with buffer of length SD_BUF_SIZE
2322 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2325 struct scsi_device
*sdp
= sdkp
->device
;
2330 struct scsi_mode_data data
;
2331 struct scsi_sense_hdr sshdr
;
2332 int old_wce
= sdkp
->WCE
;
2333 int old_rcd
= sdkp
->RCD
;
2334 int old_dpofua
= sdkp
->DPOFUA
;
2337 if (sdkp
->cache_override
)
2341 if (sdp
->skip_ms_page_8
) {
2342 if (sdp
->type
== TYPE_RBC
)
2345 if (sdp
->skip_ms_page_3f
)
2348 if (sdp
->use_192_bytes_for_3f
)
2352 } else if (sdp
->type
== TYPE_RBC
) {
2360 /* cautiously ask */
2361 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, first_len
,
2364 if (!scsi_status_is_good(res
))
2367 if (!data
.header_length
) {
2370 sd_first_printk(KERN_ERR
, sdkp
,
2371 "Missing header in MODE_SENSE response\n");
2374 /* that went OK, now ask for the proper length */
2378 * We're only interested in the first three bytes, actually.
2379 * But the data cache page is defined for the first 20.
2383 else if (len
> SD_BUF_SIZE
) {
2384 sd_first_printk(KERN_NOTICE
, sdkp
, "Truncating mode parameter "
2385 "data from %d to %d bytes\n", len
, SD_BUF_SIZE
);
2388 if (modepage
== 0x3F && sdp
->use_192_bytes_for_3f
)
2392 if (len
> first_len
)
2393 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
2396 if (scsi_status_is_good(res
)) {
2397 int offset
= data
.header_length
+ data
.block_descriptor_length
;
2399 while (offset
< len
) {
2400 u8 page_code
= buffer
[offset
] & 0x3F;
2401 u8 spf
= buffer
[offset
] & 0x40;
2403 if (page_code
== 8 || page_code
== 6) {
2404 /* We're interested only in the first 3 bytes.
2406 if (len
- offset
<= 2) {
2407 sd_first_printk(KERN_ERR
, sdkp
,
2408 "Incomplete mode parameter "
2412 modepage
= page_code
;
2416 /* Go to the next page */
2417 if (spf
&& len
- offset
> 3)
2418 offset
+= 4 + (buffer
[offset
+2] << 8) +
2420 else if (!spf
&& len
- offset
> 1)
2421 offset
+= 2 + buffer
[offset
+1];
2423 sd_first_printk(KERN_ERR
, sdkp
,
2425 "parameter data\n");
2431 sd_first_printk(KERN_ERR
, sdkp
, "No Caching mode page found\n");
2435 if (modepage
== 8) {
2436 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
2437 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
2439 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
2443 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
2444 if (sdp
->broken_fua
) {
2445 sd_first_printk(KERN_NOTICE
, sdkp
, "Disabling FUA\n");
2447 } else if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
2448 sd_first_printk(KERN_NOTICE
, sdkp
,
2449 "Uses READ/WRITE(6), disabling FUA\n");
2453 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
2454 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
2455 sd_printk(KERN_NOTICE
, sdkp
,
2456 "Write cache: %s, read cache: %s, %s\n",
2457 sdkp
->WCE
? "enabled" : "disabled",
2458 sdkp
->RCD
? "disabled" : "enabled",
2459 sdkp
->DPOFUA
? "supports DPO and FUA"
2460 : "doesn't support DPO or FUA");
2466 if (scsi_sense_valid(&sshdr
) &&
2467 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
2468 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
2469 /* Invalid field in CDB */
2470 sd_first_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2472 sd_first_printk(KERN_ERR
, sdkp
,
2473 "Asking for cache data failed\n");
2476 if (sdp
->wce_default_on
) {
2477 sd_first_printk(KERN_NOTICE
, sdkp
,
2478 "Assuming drive cache: write back\n");
2481 sd_first_printk(KERN_ERR
, sdkp
,
2482 "Assuming drive cache: write through\n");
2490 * The ATO bit indicates whether the DIF application tag is available
2491 * for use by the operating system.
2493 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2496 struct scsi_device
*sdp
= sdkp
->device
;
2497 struct scsi_mode_data data
;
2498 struct scsi_sense_hdr sshdr
;
2500 if (sdp
->type
!= TYPE_DISK
)
2503 if (sdkp
->protection_type
== 0)
2506 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2507 SD_MAX_RETRIES
, &data
, &sshdr
);
2509 if (!scsi_status_is_good(res
) || !data
.header_length
||
2511 sd_first_printk(KERN_WARNING
, sdkp
,
2512 "getting Control mode page failed, assume no ATO\n");
2514 if (scsi_sense_valid(&sshdr
))
2515 sd_print_sense_hdr(sdkp
, &sshdr
);
2520 offset
= data
.header_length
+ data
.block_descriptor_length
;
2522 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2523 sd_first_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2527 if ((buffer
[offset
+ 5] & 0x80) == 0)
2536 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2537 * @disk: disk to query
2539 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2541 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2542 const int vpd_len
= 64;
2543 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2546 /* Block Limits VPD */
2547 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2550 blk_queue_io_min(sdkp
->disk
->queue
,
2551 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2552 blk_queue_io_opt(sdkp
->disk
->queue
,
2553 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2555 if (buffer
[3] == 0x3c) {
2556 unsigned int lba_count
, desc_count
;
2558 sdkp
->max_ws_blocks
= (u32
)get_unaligned_be64(&buffer
[36]);
2563 lba_count
= get_unaligned_be32(&buffer
[20]);
2564 desc_count
= get_unaligned_be32(&buffer
[24]);
2566 if (lba_count
&& desc_count
)
2567 sdkp
->max_unmap_blocks
= lba_count
;
2569 sdkp
->unmap_granularity
= get_unaligned_be32(&buffer
[28]);
2571 if (buffer
[32] & 0x80)
2572 sdkp
->unmap_alignment
=
2573 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2575 if (!sdkp
->lbpvpd
) { /* LBP VPD page not provided */
2577 if (sdkp
->max_unmap_blocks
)
2578 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2580 sd_config_discard(sdkp
, SD_LBP_WS16
);
2582 } else { /* LBP VPD page tells us what to use */
2584 if (sdkp
->lbpu
&& sdkp
->max_unmap_blocks
)
2585 sd_config_discard(sdkp
, SD_LBP_UNMAP
);
2586 else if (sdkp
->lbpws
)
2587 sd_config_discard(sdkp
, SD_LBP_WS16
);
2588 else if (sdkp
->lbpws10
)
2589 sd_config_discard(sdkp
, SD_LBP_WS10
);
2591 sd_config_discard(sdkp
, SD_LBP_DISABLE
);
2600 * sd_read_block_characteristics - Query block dev. characteristics
2601 * @disk: disk to query
2603 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2605 unsigned char *buffer
;
2607 const int vpd_len
= 64;
2609 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2612 /* Block Device Characteristics VPD */
2613 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2616 rot
= get_unaligned_be16(&buffer
[4]);
2619 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2626 * sd_read_block_provisioning - Query provisioning VPD page
2627 * @disk: disk to query
2629 static void sd_read_block_provisioning(struct scsi_disk
*sdkp
)
2631 unsigned char *buffer
;
2632 const int vpd_len
= 8;
2634 if (sdkp
->lbpme
== 0)
2637 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2639 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2643 sdkp
->lbpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2644 sdkp
->lbpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2645 sdkp
->lbpws10
= (buffer
[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2651 static void sd_read_write_same(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2653 struct scsi_device
*sdev
= sdkp
->device
;
2655 if (sdev
->host
->no_write_same
) {
2656 sdev
->no_write_same
= 1;
2661 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, INQUIRY
) < 0) {
2662 /* too large values might cause issues with arcmsr */
2663 int vpd_buf_len
= 64;
2665 sdev
->no_report_opcodes
= 1;
2667 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2668 * CODES is unsupported and the device has an ATA
2669 * Information VPD page (SAT).
2671 if (!scsi_get_vpd_page(sdev
, 0x89, buffer
, vpd_buf_len
))
2672 sdev
->no_write_same
= 1;
2675 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME_16
) == 1)
2678 if (scsi_report_opcode(sdev
, buffer
, SD_BUF_SIZE
, WRITE_SAME
) == 1)
2682 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2685 * Although VPD inquiries can go to SCSI-2 type devices,
2686 * some USB ones crash on receiving them, and the pages
2687 * we currently ask for are for SPC-3 and beyond
2689 if (sdp
->scsi_level
> SCSI_SPC_2
&& !sdp
->skip_vpd_pages
)
2695 * sd_revalidate_disk - called the first time a new disk is seen,
2696 * performs disk spin up, read_capacity, etc.
2697 * @disk: struct gendisk we care about
2699 static int sd_revalidate_disk(struct gendisk
*disk
)
2701 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2702 struct scsi_device
*sdp
= sdkp
->device
;
2703 unsigned char *buffer
;
2706 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2707 "sd_revalidate_disk\n"));
2710 * If the device is offline, don't try and read capacity or any
2711 * of the other niceties.
2713 if (!scsi_device_online(sdp
))
2716 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2718 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2719 "allocation failure.\n");
2723 sd_spinup_disk(sdkp
);
2726 * Without media there is no reason to ask; moreover, some devices
2727 * react badly if we do.
2729 if (sdkp
->media_present
) {
2730 sd_read_capacity(sdkp
, buffer
);
2732 if (sd_try_extended_inquiry(sdp
)) {
2733 sd_read_block_provisioning(sdkp
);
2734 sd_read_block_limits(sdkp
);
2735 sd_read_block_characteristics(sdkp
);
2738 sd_read_write_protect_flag(sdkp
, buffer
);
2739 sd_read_cache_type(sdkp
, buffer
);
2740 sd_read_app_tag_own(sdkp
, buffer
);
2741 sd_read_write_same(sdkp
, buffer
);
2744 sdkp
->first_scan
= 0;
2747 * We now have all cache related info, determine how we deal
2748 * with flush requests.
2756 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2758 set_capacity(disk
, sdkp
->capacity
);
2759 sd_config_write_same(sdkp
);
2767 * sd_unlock_native_capacity - unlock native capacity
2768 * @disk: struct gendisk to set capacity for
2770 * Block layer calls this function if it detects that partitions
2771 * on @disk reach beyond the end of the device. If the SCSI host
2772 * implements ->unlock_native_capacity() method, it's invoked to
2773 * give it a chance to adjust the device capacity.
2776 * Defined by block layer. Might sleep.
2778 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2780 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2782 if (sdev
->host
->hostt
->unlock_native_capacity
)
2783 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2787 * sd_format_disk_name - format disk name
2788 * @prefix: name prefix - ie. "sd" for SCSI disks
2789 * @index: index of the disk to format name for
2790 * @buf: output buffer
2791 * @buflen: length of the output buffer
2793 * SCSI disk names starts at sda. The 26th device is sdz and the
2794 * 27th is sdaa. The last one for two lettered suffix is sdzz
2795 * which is followed by sdaaa.
2797 * This is basically 26 base counting with one extra 'nil' entry
2798 * at the beginning from the second digit on and can be
2799 * determined using similar method as 26 base conversion with the
2800 * index shifted -1 after each digit is computed.
2806 * 0 on success, -errno on failure.
2808 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2810 const int base
= 'z' - 'a' + 1;
2811 char *begin
= buf
+ strlen(prefix
);
2812 char *end
= buf
+ buflen
;
2822 *--p
= 'a' + (index
% unit
);
2823 index
= (index
/ unit
) - 1;
2824 } while (index
>= 0);
2826 memmove(begin
, p
, end
- p
);
2827 memcpy(buf
, prefix
, strlen(prefix
));
2833 * The asynchronous part of sd_probe
2835 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2837 struct scsi_disk
*sdkp
= data
;
2838 struct scsi_device
*sdp
;
2845 index
= sdkp
->index
;
2846 dev
= &sdp
->sdev_gendev
;
2848 gd
->major
= sd_major((index
& 0xf0) >> 4);
2849 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2850 gd
->minors
= SD_MINORS
;
2852 gd
->fops
= &sd_fops
;
2853 gd
->private_data
= &sdkp
->driver
;
2854 gd
->queue
= sdkp
->device
->request_queue
;
2856 /* defaults, until the device tells us otherwise */
2857 sdp
->sector_size
= 512;
2859 sdkp
->media_present
= 1;
2860 sdkp
->write_prot
= 0;
2861 sdkp
->cache_override
= 0;
2865 sdkp
->first_scan
= 1;
2866 sdkp
->max_medium_access_timeouts
= SD_MAX_MEDIUM_TIMEOUTS
;
2868 sd_revalidate_disk(gd
);
2870 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2871 gd
->flags
= GENHD_FL_EXT_DEVT
;
2872 if (sdp
->removable
) {
2873 gd
->flags
|= GENHD_FL_REMOVABLE
;
2874 gd
->events
|= DISK_EVENT_MEDIA_CHANGE
;
2877 blk_pm_runtime_init(sdp
->request_queue
, dev
);
2880 sd_dif_config_host(sdkp
);
2882 sd_revalidate_disk(gd
);
2884 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2885 sdp
->removable
? "removable " : "");
2886 scsi_autopm_put_device(sdp
);
2887 put_device(&sdkp
->dev
);
2891 * sd_probe - called during driver initialization and whenever a
2892 * new scsi device is attached to the system. It is called once
2893 * for each scsi device (not just disks) present.
2894 * @dev: pointer to device object
2896 * Returns 0 if successful (or not interested in this scsi device
2897 * (e.g. scanner)); 1 when there is an error.
2899 * Note: this function is invoked from the scsi mid-level.
2900 * This function sets up the mapping between a given
2901 * <host,channel,id,lun> (found in sdp) and new device name
2902 * (e.g. /dev/sda). More precisely it is the block device major
2903 * and minor number that is chosen here.
2905 * Assume sd_probe is not re-entrant (for time being)
2906 * Also think about sd_probe() and sd_remove() running coincidentally.
2908 static int sd_probe(struct device
*dev
)
2910 struct scsi_device
*sdp
= to_scsi_device(dev
);
2911 struct scsi_disk
*sdkp
;
2917 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2920 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2924 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2928 gd
= alloc_disk(SD_MINORS
);
2933 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2936 spin_lock(&sd_index_lock
);
2937 error
= ida_get_new(&sd_index_ida
, &index
);
2938 spin_unlock(&sd_index_lock
);
2939 } while (error
== -EAGAIN
);
2942 sdev_printk(KERN_WARNING
, sdp
, "sd_probe: memory exhausted.\n");
2946 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2948 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name length exceeded.\n");
2949 goto out_free_index
;
2953 sdkp
->driver
= &sd_template
;
2955 sdkp
->index
= index
;
2956 atomic_set(&sdkp
->openers
, 0);
2957 atomic_set(&sdkp
->device
->ioerr_cnt
, 0);
2959 if (!sdp
->request_queue
->rq_timeout
) {
2960 if (sdp
->type
!= TYPE_MOD
)
2961 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2963 blk_queue_rq_timeout(sdp
->request_queue
,
2967 device_initialize(&sdkp
->dev
);
2968 sdkp
->dev
.parent
= dev
;
2969 sdkp
->dev
.class = &sd_disk_class
;
2970 dev_set_name(&sdkp
->dev
, "%s", dev_name(dev
));
2972 if (device_add(&sdkp
->dev
))
2973 goto out_free_index
;
2976 dev_set_drvdata(dev
, sdkp
);
2978 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2979 async_schedule_domain(sd_probe_async
, sdkp
, &scsi_sd_probe_domain
);
2984 spin_lock(&sd_index_lock
);
2985 ida_remove(&sd_index_ida
, index
);
2986 spin_unlock(&sd_index_lock
);
2996 * sd_remove - called whenever a scsi disk (previously recognized by
2997 * sd_probe) is detached from the system. It is called (potentially
2998 * multiple times) during sd module unload.
2999 * @sdp: pointer to mid level scsi device object
3001 * Note: this function is invoked from the scsi mid-level.
3002 * This function potentially frees up a device name (e.g. /dev/sdc)
3003 * that could be re-used by a subsequent sd_probe().
3004 * This function is not called when the built-in sd driver is "exit-ed".
3006 static int sd_remove(struct device
*dev
)
3008 struct scsi_disk
*sdkp
;
3011 sdkp
= dev_get_drvdata(dev
);
3012 devt
= disk_devt(sdkp
->disk
);
3013 scsi_autopm_get_device(sdkp
->device
);
3015 async_synchronize_full_domain(&scsi_sd_pm_domain
);
3016 async_synchronize_full_domain(&scsi_sd_probe_domain
);
3017 device_del(&sdkp
->dev
);
3018 del_gendisk(sdkp
->disk
);
3021 blk_register_region(devt
, SD_MINORS
, NULL
,
3022 sd_default_probe
, NULL
, NULL
);
3024 mutex_lock(&sd_ref_mutex
);
3025 dev_set_drvdata(dev
, NULL
);
3026 put_device(&sdkp
->dev
);
3027 mutex_unlock(&sd_ref_mutex
);
3033 * scsi_disk_release - Called to free the scsi_disk structure
3034 * @dev: pointer to embedded class device
3036 * sd_ref_mutex must be held entering this routine. Because it is
3037 * called on last put, you should always use the scsi_disk_get()
3038 * scsi_disk_put() helpers which manipulate the semaphore directly
3039 * and never do a direct put_device.
3041 static void scsi_disk_release(struct device
*dev
)
3043 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
3044 struct gendisk
*disk
= sdkp
->disk
;
3046 spin_lock(&sd_index_lock
);
3047 ida_remove(&sd_index_ida
, sdkp
->index
);
3048 spin_unlock(&sd_index_lock
);
3050 disk
->private_data
= NULL
;
3052 put_device(&sdkp
->device
->sdev_gendev
);
3057 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
3059 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
3060 struct scsi_sense_hdr sshdr
;
3061 struct scsi_device
*sdp
= sdkp
->device
;
3065 cmd
[4] |= 1; /* START */
3067 if (sdp
->start_stop_pwr_cond
)
3068 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
3070 if (!scsi_device_online(sdp
))
3073 res
= scsi_execute_req_flags(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
3074 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
, REQ_PM
);
3076 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
3077 sd_print_result(sdkp
, res
);
3078 if (driver_byte(res
) & DRIVER_SENSE
)
3079 sd_print_sense_hdr(sdkp
, &sshdr
);
3080 if (scsi_sense_valid(&sshdr
) &&
3081 /* 0x3a is medium not present */
3086 /* SCSI error codes must not go to the generic layer */
3094 * Send a SYNCHRONIZE CACHE instruction down to the device through
3095 * the normal SCSI command structure. Wait for the command to
3098 static void sd_shutdown(struct device
*dev
)
3100 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3103 return; /* this can happen */
3105 if (pm_runtime_suspended(dev
))
3108 if (sdkp
->WCE
&& sdkp
->media_present
) {
3109 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3110 sd_sync_cache(sdkp
);
3113 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
3114 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3115 sd_start_stop_device(sdkp
, 0);
3119 scsi_disk_put(sdkp
);
3122 static int sd_suspend_common(struct device
*dev
, bool ignore_stop_errors
)
3124 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3128 return 0; /* this can happen */
3130 if (sdkp
->WCE
&& sdkp
->media_present
) {
3131 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
3132 ret
= sd_sync_cache(sdkp
);
3134 /* ignore OFFLINE device */
3141 if (sdkp
->device
->manage_start_stop
) {
3142 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
3143 /* an error is not worth aborting a system sleep */
3144 ret
= sd_start_stop_device(sdkp
, 0);
3145 if (ignore_stop_errors
)
3150 scsi_disk_put(sdkp
);
3154 static int sd_suspend_system(struct device
*dev
)
3156 return sd_suspend_common(dev
, true);
3159 static int sd_suspend_runtime(struct device
*dev
)
3161 return sd_suspend_common(dev
, false);
3164 static int sd_resume(struct device
*dev
)
3166 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
3169 if (!sdkp
->device
->manage_start_stop
)
3172 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
3173 ret
= sd_start_stop_device(sdkp
, 1);
3176 scsi_disk_put(sdkp
);
3181 * init_sd - entry point for this driver (both when built in or when
3184 * Note: this function registers this driver with the scsi mid-level.
3186 static int __init
init_sd(void)
3188 int majors
= 0, i
, err
;
3190 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3192 for (i
= 0; i
< SD_MAJORS
; i
++) {
3193 if (register_blkdev(sd_major(i
), "sd") != 0)
3196 blk_register_region(sd_major(i
), SD_MINORS
, NULL
,
3197 sd_default_probe
, NULL
, NULL
);
3203 err
= class_register(&sd_disk_class
);
3207 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
3209 if (!sd_cdb_cache
) {
3210 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
3214 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
3216 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
3220 err
= scsi_register_driver(&sd_template
.gendrv
);
3222 goto err_out_driver
;
3227 mempool_destroy(sd_cdb_pool
);
3230 kmem_cache_destroy(sd_cdb_cache
);
3233 class_unregister(&sd_disk_class
);
3235 for (i
= 0; i
< SD_MAJORS
; i
++)
3236 unregister_blkdev(sd_major(i
), "sd");
3241 * exit_sd - exit point for this driver (when it is a module).
3243 * Note: this function unregisters this driver from the scsi mid-level.
3245 static void __exit
exit_sd(void)
3249 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3251 scsi_unregister_driver(&sd_template
.gendrv
);
3252 mempool_destroy(sd_cdb_pool
);
3253 kmem_cache_destroy(sd_cdb_cache
);
3255 class_unregister(&sd_disk_class
);
3257 for (i
= 0; i
< SD_MAJORS
; i
++) {
3258 blk_unregister_region(sd_major(i
), SD_MINORS
);
3259 unregister_blkdev(sd_major(i
), "sd");
3263 module_init(init_sd
);
3264 module_exit(exit_sd
);
3266 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
3267 struct scsi_sense_hdr
*sshdr
)
3269 sd_printk(KERN_INFO
, sdkp
, " ");
3270 scsi_show_sense_hdr(sshdr
);
3271 sd_printk(KERN_INFO
, sdkp
, " ");
3272 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
3275 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
3277 sd_printk(KERN_INFO
, sdkp
, " ");
3278 scsi_show_result(result
);