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 <asm/uaccess.h>
54 #include <asm/unaligned.h>
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_cmnd.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h>
64 #include <scsi/scsicam.h>
67 #include "scsi_logging.h"
69 MODULE_AUTHOR("Eric Youngdale");
70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
71 MODULE_LICENSE("GPL");
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
99 static int sd_revalidate_disk(struct gendisk
*);
100 static void sd_unlock_native_capacity(struct gendisk
*disk
);
101 static int sd_probe(struct device
*);
102 static int sd_remove(struct device
*);
103 static void sd_shutdown(struct device
*);
104 static int sd_suspend(struct device
*, pm_message_t state
);
105 static int sd_resume(struct device
*);
106 static void sd_rescan(struct device
*);
107 static int sd_done(struct scsi_cmnd
*);
108 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
109 static void scsi_disk_release(struct device
*cdev
);
110 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
111 static void sd_print_result(struct scsi_disk
*, int);
113 static DEFINE_SPINLOCK(sd_index_lock
);
114 static DEFINE_IDA(sd_index_ida
);
116 /* This semaphore is used to mediate the 0->1 reference get in the
117 * face of object destruction (i.e. we can't allow a get on an
118 * object after last put) */
119 static DEFINE_MUTEX(sd_ref_mutex
);
121 static struct kmem_cache
*sd_cdb_cache
;
122 static mempool_t
*sd_cdb_pool
;
124 static const char *sd_cache_types
[] = {
125 "write through", "none", "write back",
126 "write back, no read (daft)"
130 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
131 const char *buf
, size_t count
)
133 int i
, ct
= -1, rcd
, wce
, sp
;
134 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
135 struct scsi_device
*sdp
= sdkp
->device
;
138 struct scsi_mode_data data
;
139 struct scsi_sense_hdr sshdr
;
142 if (sdp
->type
!= TYPE_DISK
)
143 /* no cache control on RBC devices; theoretically they
144 * can do it, but there's probably so many exceptions
145 * it's not worth the risk */
148 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
149 len
= strlen(sd_cache_types
[i
]);
150 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
158 rcd
= ct
& 0x01 ? 1 : 0;
159 wce
= ct
& 0x02 ? 1 : 0;
160 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
161 SD_MAX_RETRIES
, &data
, NULL
))
163 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
164 data
.block_descriptor_length
);
165 buffer_data
= buffer
+ data
.header_length
+
166 data
.block_descriptor_length
;
167 buffer_data
[2] &= ~0x05;
168 buffer_data
[2] |= wce
<< 2 | rcd
;
169 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
171 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
172 SD_MAX_RETRIES
, &data
, &sshdr
)) {
173 if (scsi_sense_valid(&sshdr
))
174 sd_print_sense_hdr(sdkp
, &sshdr
);
177 revalidate_disk(sdkp
->disk
);
182 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
183 const char *buf
, size_t count
)
185 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
186 struct scsi_device
*sdp
= sdkp
->device
;
188 if (!capable(CAP_SYS_ADMIN
))
191 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
197 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
198 const char *buf
, size_t count
)
200 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
201 struct scsi_device
*sdp
= sdkp
->device
;
203 if (!capable(CAP_SYS_ADMIN
))
206 if (sdp
->type
!= TYPE_DISK
)
209 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
215 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
218 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
219 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
221 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
225 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
227 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
229 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
233 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
236 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
237 struct scsi_device
*sdp
= sdkp
->device
;
239 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
243 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
246 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
248 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
252 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
255 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
257 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
261 sd_show_protection_mode(struct device
*dev
, struct device_attribute
*attr
,
264 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
265 struct scsi_device
*sdp
= sdkp
->device
;
266 unsigned int dif
, dix
;
268 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
269 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
271 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
277 return snprintf(buf
, 20, "none\n");
279 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
283 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
286 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
288 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
292 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
295 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
297 return snprintf(buf
, 20, "%u\n", sdkp
->thin_provisioning
);
300 static struct device_attribute sd_disk_attrs
[] = {
301 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
302 sd_store_cache_type
),
303 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
304 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
305 sd_store_allow_restart
),
306 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
307 sd_store_manage_start_stop
),
308 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
309 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
310 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
311 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
315 static struct class sd_disk_class
= {
317 .owner
= THIS_MODULE
,
318 .dev_release
= scsi_disk_release
,
319 .dev_attrs
= sd_disk_attrs
,
322 static struct scsi_driver sd_template
= {
323 .owner
= THIS_MODULE
,
328 .suspend
= sd_suspend
,
330 .shutdown
= sd_shutdown
,
337 * Device no to disk mapping:
339 * major disc2 disc p1
340 * |............|.............|....|....| <- dev_t
343 * Inside a major, we have 16k disks, however mapped non-
344 * contiguously. The first 16 disks are for major0, the next
345 * ones with major1, ... Disk 256 is for major0 again, disk 272
347 * As we stay compatible with our numbering scheme, we can reuse
348 * the well-know SCSI majors 8, 65--71, 136--143.
350 static int sd_major(int major_idx
)
354 return SCSI_DISK0_MAJOR
;
356 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
358 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
361 return 0; /* shut up gcc */
365 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
367 struct scsi_disk
*sdkp
= NULL
;
369 if (disk
->private_data
) {
370 sdkp
= scsi_disk(disk
);
371 if (scsi_device_get(sdkp
->device
) == 0)
372 get_device(&sdkp
->dev
);
379 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
381 struct scsi_disk
*sdkp
;
383 mutex_lock(&sd_ref_mutex
);
384 sdkp
= __scsi_disk_get(disk
);
385 mutex_unlock(&sd_ref_mutex
);
389 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
391 struct scsi_disk
*sdkp
;
393 mutex_lock(&sd_ref_mutex
);
394 sdkp
= dev_get_drvdata(dev
);
396 sdkp
= __scsi_disk_get(sdkp
->disk
);
397 mutex_unlock(&sd_ref_mutex
);
401 static void scsi_disk_put(struct scsi_disk
*sdkp
)
403 struct scsi_device
*sdev
= sdkp
->device
;
405 mutex_lock(&sd_ref_mutex
);
406 put_device(&sdkp
->dev
);
407 scsi_device_put(sdev
);
408 mutex_unlock(&sd_ref_mutex
);
411 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
413 unsigned int prot_op
= SCSI_PROT_NORMAL
;
414 unsigned int dix
= scsi_prot_sg_count(scmd
);
416 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
418 prot_op
= SCSI_PROT_READ_PASS
;
419 else if (dif
&& !dix
)
420 prot_op
= SCSI_PROT_READ_STRIP
;
421 else if (!dif
&& dix
)
422 prot_op
= SCSI_PROT_READ_INSERT
;
425 prot_op
= SCSI_PROT_WRITE_PASS
;
426 else if (dif
&& !dix
)
427 prot_op
= SCSI_PROT_WRITE_INSERT
;
428 else if (!dif
&& dix
)
429 prot_op
= SCSI_PROT_WRITE_STRIP
;
432 scsi_set_prot_op(scmd
, prot_op
);
433 scsi_set_prot_type(scmd
, dif
);
437 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
438 * @sdp: scsi device to operate one
439 * @rq: Request to prepare
441 * Will issue either UNMAP or WRITE SAME(16) depending on preference
442 * indicated by target device.
444 static int scsi_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
446 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
447 struct bio
*bio
= rq
->bio
;
448 sector_t sector
= bio
->bi_sector
;
449 unsigned int nr_sectors
= bio_sectors(bio
);
454 if (sdkp
->device
->sector_size
== 4096) {
459 rq
->timeout
= SD_TIMEOUT
;
461 memset(rq
->cmd
, 0, rq
->cmd_len
);
463 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
465 return BLKPREP_DEFER
;
468 char *buf
= page_address(page
);
474 put_unaligned_be16(6 + 16, &buf
[0]);
475 put_unaligned_be16(16, &buf
[2]);
476 put_unaligned_be64(sector
, &buf
[8]);
477 put_unaligned_be32(nr_sectors
, &buf
[16]);
482 rq
->cmd
[0] = WRITE_SAME_16
;
483 rq
->cmd
[1] = 0x8; /* UNMAP */
484 put_unaligned_be64(sector
, &rq
->cmd
[2]);
485 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
487 len
= sdkp
->device
->sector_size
;
490 blk_add_request_payload(rq
, page
, len
);
491 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
492 rq
->buffer
= page_address(page
);
493 if (ret
!= BLKPREP_OK
) {
500 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
502 rq
->timeout
= SD_FLUSH_TIMEOUT
;
503 rq
->retries
= SD_MAX_RETRIES
;
504 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
507 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
510 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
512 if (rq
->cmd_flags
& REQ_DISCARD
) {
513 free_page((unsigned long)rq
->buffer
);
519 * sd_init_command - build a scsi (read or write) command from
520 * information in the request structure.
521 * @SCpnt: pointer to mid-level's per scsi command structure that
522 * contains request and into which the scsi command is written
524 * Returns 1 if successful and 0 if error (or cannot be done now).
526 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
528 struct scsi_cmnd
*SCpnt
;
529 struct scsi_device
*sdp
= q
->queuedata
;
530 struct gendisk
*disk
= rq
->rq_disk
;
531 struct scsi_disk
*sdkp
;
532 sector_t block
= blk_rq_pos(rq
);
534 unsigned int this_count
= blk_rq_sectors(rq
);
536 unsigned char protect
;
539 * Discard request come in as REQ_TYPE_FS but we turn them into
540 * block PC requests to make life easier.
542 if (rq
->cmd_flags
& REQ_DISCARD
) {
543 ret
= scsi_setup_discard_cmnd(sdp
, rq
);
545 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
546 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
548 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
549 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
551 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
555 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
556 if (ret
!= BLKPREP_OK
)
559 sdkp
= scsi_disk(disk
);
561 /* from here on until we're complete, any goto out
562 * is used for a killable error condition */
565 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
566 "sd_init_command: block=%llu, "
568 (unsigned long long)block
,
571 if (!sdp
|| !scsi_device_online(sdp
) ||
572 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
573 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
574 "Finishing %u sectors\n",
575 blk_rq_sectors(rq
)));
576 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
577 "Retry with 0x%p\n", SCpnt
));
583 * quietly refuse to do anything to a changed disc until
584 * the changed bit has been reset
586 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
591 * Some SD card readers can't handle multi-sector accesses which touch
592 * the last one or two hardware sectors. Split accesses as needed.
594 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
595 (sdp
->sector_size
/ 512);
597 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
598 if (block
< threshold
) {
599 /* Access up to the threshold but not beyond */
600 this_count
= threshold
- block
;
602 /* Access only a single hardware sector */
603 this_count
= sdp
->sector_size
/ 512;
607 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
608 (unsigned long long)block
));
611 * If we have a 1K hardware sectorsize, prevent access to single
612 * 512 byte sectors. In theory we could handle this - in fact
613 * the scsi cdrom driver must be able to handle this because
614 * we typically use 1K blocksizes, and cdroms typically have
615 * 2K hardware sectorsizes. Of course, things are simpler
616 * with the cdrom, since it is read-only. For performance
617 * reasons, the filesystems should be able to handle this
618 * and not force the scsi disk driver to use bounce buffers
621 if (sdp
->sector_size
== 1024) {
622 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
623 scmd_printk(KERN_ERR
, SCpnt
,
624 "Bad block number requested\n");
628 this_count
= this_count
>> 1;
631 if (sdp
->sector_size
== 2048) {
632 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
633 scmd_printk(KERN_ERR
, SCpnt
,
634 "Bad block number requested\n");
638 this_count
= this_count
>> 2;
641 if (sdp
->sector_size
== 4096) {
642 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
643 scmd_printk(KERN_ERR
, SCpnt
,
644 "Bad block number requested\n");
648 this_count
= this_count
>> 3;
651 if (rq_data_dir(rq
) == WRITE
) {
652 if (!sdp
->writeable
) {
655 SCpnt
->cmnd
[0] = WRITE_6
;
656 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
658 if (blk_integrity_rq(rq
) &&
659 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
662 } else if (rq_data_dir(rq
) == READ
) {
663 SCpnt
->cmnd
[0] = READ_6
;
664 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
666 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
670 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
671 "%s %d/%u 512 byte blocks.\n",
672 (rq_data_dir(rq
) == WRITE
) ?
673 "writing" : "reading", this_count
,
674 blk_rq_sectors(rq
)));
676 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
677 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
683 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
684 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
686 if (unlikely(SCpnt
->cmnd
== NULL
)) {
691 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
692 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
693 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
694 SCpnt
->cmnd
[7] = 0x18;
695 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
696 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
699 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
700 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
701 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
702 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
703 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
704 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
705 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
706 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
708 /* Expected Indirect LBA */
709 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
710 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
711 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
712 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
714 /* Transfer length */
715 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
716 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
717 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
718 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
719 } else if (block
> 0xffffffff) {
720 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
721 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
722 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
723 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
724 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
725 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
726 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
727 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
728 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
729 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
730 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
731 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
732 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
733 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
734 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
735 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
736 scsi_device_protection(SCpnt
->device
) ||
737 SCpnt
->device
->use_10_for_rw
) {
738 if (this_count
> 0xffff)
741 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
742 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
743 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
744 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
745 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
746 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
747 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
748 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
749 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
751 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
753 * This happens only if this drive failed
754 * 10byte rw command with ILLEGAL_REQUEST
755 * during operation and thus turned off
758 scmd_printk(KERN_ERR
, SCpnt
,
759 "FUA write on READ/WRITE(6) drive\n");
763 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
764 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
765 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
766 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
769 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
771 /* If DIF or DIX is enabled, tell HBA how to handle request */
772 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
773 sd_prot_op(SCpnt
, host_dif
);
776 * We shouldn't disconnect in the middle of a sector, so with a dumb
777 * host adapter, it's safe to assume that we can at least transfer
778 * this many bytes between each connect / disconnect.
780 SCpnt
->transfersize
= sdp
->sector_size
;
781 SCpnt
->underflow
= this_count
<< 9;
782 SCpnt
->allowed
= SD_MAX_RETRIES
;
785 * This indicates that the command is ready from our end to be
790 return scsi_prep_return(q
, rq
, ret
);
794 * sd_open - open a scsi disk device
795 * @inode: only i_rdev member may be used
796 * @filp: only f_mode and f_flags may be used
798 * Returns 0 if successful. Returns a negated errno value in case
801 * Note: This can be called from a user context (e.g. fsck(1) )
802 * or from within the kernel (e.g. as a result of a mount(1) ).
803 * In the latter case @inode and @filp carry an abridged amount
804 * of information as noted above.
806 * Locking: called with bdev->bd_mutex held.
808 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
810 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
811 struct scsi_device
*sdev
;
817 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
821 retval
= scsi_autopm_get_device(sdev
);
826 * If the device is in error recovery, wait until it is done.
827 * If the device is offline, then disallow any access to it.
830 if (!scsi_block_when_processing_errors(sdev
))
833 if (sdev
->removable
|| sdkp
->write_prot
)
834 check_disk_change(bdev
);
837 * If the drive is empty, just let the open fail.
840 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
844 * If the device has the write protect tab set, have the open fail
845 * if the user expects to be able to write to the thing.
848 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
852 * It is possible that the disk changing stuff resulted in
853 * the device being taken offline. If this is the case,
854 * report this to the user, and don't pretend that the
855 * open actually succeeded.
858 if (!scsi_device_online(sdev
))
861 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
862 if (scsi_block_when_processing_errors(sdev
))
863 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
869 scsi_autopm_put_device(sdev
);
876 * sd_release - invoked when the (last) close(2) is called on this
878 * @inode: only i_rdev member may be used
879 * @filp: only f_mode and f_flags may be used
883 * Note: may block (uninterruptible) if error recovery is underway
886 * Locking: called with bdev->bd_mutex held.
888 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
890 struct scsi_disk
*sdkp
= scsi_disk(disk
);
891 struct scsi_device
*sdev
= sdkp
->device
;
893 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
895 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
896 if (scsi_block_when_processing_errors(sdev
))
897 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
901 * XXX and what if there are packets in flight and this close()
902 * XXX is followed by a "rmmod sd_mod"?
905 scsi_autopm_put_device(sdev
);
910 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
912 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
913 struct scsi_device
*sdp
= sdkp
->device
;
914 struct Scsi_Host
*host
= sdp
->host
;
917 /* default to most commonly used values */
918 diskinfo
[0] = 0x40; /* 1 << 6 */
919 diskinfo
[1] = 0x20; /* 1 << 5 */
920 diskinfo
[2] = sdkp
->capacity
>> 11;
922 /* override with calculated, extended default, or driver values */
923 if (host
->hostt
->bios_param
)
924 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
926 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
928 geo
->heads
= diskinfo
[0];
929 geo
->sectors
= diskinfo
[1];
930 geo
->cylinders
= diskinfo
[2];
935 * sd_ioctl - process an ioctl
936 * @inode: only i_rdev/i_bdev members may be used
937 * @filp: only f_mode and f_flags may be used
938 * @cmd: ioctl command number
939 * @arg: this is third argument given to ioctl(2) system call.
940 * Often contains a pointer.
942 * Returns 0 if successful (some ioctls return postive numbers on
943 * success as well). Returns a negated errno value in case of error.
945 * Note: most ioctls are forward onto the block subsystem or further
946 * down in the scsi subsystem.
948 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
949 unsigned int cmd
, unsigned long arg
)
951 struct gendisk
*disk
= bdev
->bd_disk
;
952 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
953 void __user
*p
= (void __user
*)arg
;
956 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
957 disk
->disk_name
, cmd
));
960 * If we are in the middle of error recovery, don't let anyone
961 * else try and use this device. Also, if error recovery fails, it
962 * may try and take the device offline, in which case all further
963 * access to the device is prohibited.
965 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
966 (mode
& FMODE_NDELAY
) != 0);
967 if (!scsi_block_when_processing_errors(sdp
) || !error
)
971 * Send SCSI addressing ioctls directly to mid level, send other
972 * ioctls to block level and then onto mid level if they can't be
976 case SCSI_IOCTL_GET_IDLUN
:
977 case SCSI_IOCTL_GET_BUS_NUMBER
:
978 error
= scsi_ioctl(sdp
, cmd
, p
);
981 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
982 if (error
!= -ENOTTY
)
984 error
= scsi_ioctl(sdp
, cmd
, p
);
991 static void set_media_not_present(struct scsi_disk
*sdkp
)
993 sdkp
->media_present
= 0;
995 sdkp
->device
->changed
= 1;
999 * sd_media_changed - check if our medium changed
1000 * @disk: kernel device descriptor
1002 * Returns 0 if not applicable or no change; 1 if change
1004 * Note: this function is invoked from the block subsystem.
1006 static int sd_media_changed(struct gendisk
*disk
)
1008 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1009 struct scsi_device
*sdp
= sdkp
->device
;
1010 struct scsi_sense_hdr
*sshdr
= NULL
;
1013 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
1015 if (!sdp
->removable
)
1019 * If the device is offline, don't send any commands - just pretend as
1020 * if the command failed. If the device ever comes back online, we
1021 * can deal with it then. It is only because of unrecoverable errors
1022 * that we would ever take a device offline in the first place.
1024 if (!scsi_device_online(sdp
)) {
1025 set_media_not_present(sdkp
);
1031 * Using TEST_UNIT_READY enables differentiation between drive with
1032 * no cartridge loaded - NOT READY, drive with changed cartridge -
1033 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1035 * Drives that auto spin down. eg iomega jaz 1G, will be started
1036 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1037 * sd_revalidate() is called.
1041 if (scsi_block_when_processing_errors(sdp
)) {
1042 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1043 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1048 * Unable to test, unit probably not ready. This usually
1049 * means there is no disc in the drive. Mark as changed,
1050 * and we will figure it out later once the drive is
1053 if (retval
|| (scsi_sense_valid(sshdr
) &&
1054 /* 0x3a is medium not present */
1055 sshdr
->asc
== 0x3a)) {
1056 set_media_not_present(sdkp
);
1062 * For removable scsi disk we have to recognise the presence
1063 * of a disk in the drive. This is kept in the struct scsi_disk
1064 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1066 sdkp
->media_present
= 1;
1068 retval
= sdp
->changed
;
1071 if (retval
!= sdkp
->previous_state
)
1072 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
1073 sdkp
->previous_state
= retval
;
1078 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1081 struct scsi_device
*sdp
= sdkp
->device
;
1082 struct scsi_sense_hdr sshdr
;
1084 if (!scsi_device_online(sdp
))
1088 for (retries
= 3; retries
> 0; --retries
) {
1089 unsigned char cmd
[10] = { 0 };
1091 cmd
[0] = SYNCHRONIZE_CACHE
;
1093 * Leave the rest of the command zero to indicate
1096 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1097 SD_FLUSH_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1103 sd_print_result(sdkp
, res
);
1104 if (driver_byte(res
) & DRIVER_SENSE
)
1105 sd_print_sense_hdr(sdkp
, &sshdr
);
1113 static void sd_rescan(struct device
*dev
)
1115 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1118 revalidate_disk(sdkp
->disk
);
1119 scsi_disk_put(sdkp
);
1124 #ifdef CONFIG_COMPAT
1126 * This gets directly called from VFS. When the ioctl
1127 * is not recognized we go back to the other translation paths.
1129 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1130 unsigned int cmd
, unsigned long arg
)
1132 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1135 * If we are in the middle of error recovery, don't let anyone
1136 * else try and use this device. Also, if error recovery fails, it
1137 * may try and take the device offline, in which case all further
1138 * access to the device is prohibited.
1140 if (!scsi_block_when_processing_errors(sdev
))
1143 if (sdev
->host
->hostt
->compat_ioctl
) {
1146 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1152 * Let the static ioctl translation table take care of it.
1154 return -ENOIOCTLCMD
;
1158 static const struct block_device_operations sd_fops
= {
1159 .owner
= THIS_MODULE
,
1161 .release
= sd_release
,
1163 .getgeo
= sd_getgeo
,
1164 #ifdef CONFIG_COMPAT
1165 .compat_ioctl
= sd_compat_ioctl
,
1167 .media_changed
= sd_media_changed
,
1168 .revalidate_disk
= sd_revalidate_disk
,
1169 .unlock_native_capacity
= sd_unlock_native_capacity
,
1172 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1174 u64 start_lba
= blk_rq_pos(scmd
->request
);
1175 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1179 * resid is optional but mostly filled in. When it's unused,
1180 * its value is zero, so we assume the whole buffer transferred
1182 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1183 unsigned int good_bytes
;
1185 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1188 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1189 SCSI_SENSE_BUFFERSIZE
,
1194 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1197 if (scmd
->device
->sector_size
< 512) {
1198 /* only legitimate sector_size here is 256 */
1202 /* be careful ... don't want any overflows */
1203 u64 factor
= scmd
->device
->sector_size
/ 512;
1204 do_div(start_lba
, factor
);
1205 do_div(end_lba
, factor
);
1208 /* The bad lba was reported incorrectly, we have no idea where
1211 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1214 /* This computation should always be done in terms of
1215 * the resolution of the device's medium.
1217 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1218 return min(good_bytes
, transferred
);
1222 * sd_done - bottom half handler: called when the lower level
1223 * driver has completed (successfully or otherwise) a scsi command.
1224 * @SCpnt: mid-level's per command structure.
1226 * Note: potentially run from within an ISR. Must not block.
1228 static int sd_done(struct scsi_cmnd
*SCpnt
)
1230 int result
= SCpnt
->result
;
1231 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1232 struct scsi_sense_hdr sshdr
;
1233 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1234 int sense_valid
= 0;
1235 int sense_deferred
= 0;
1237 if (SCpnt
->request
->cmd_flags
& REQ_DISCARD
) {
1239 scsi_set_resid(SCpnt
, 0);
1244 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1246 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1248 #ifdef CONFIG_SCSI_LOGGING
1249 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1251 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1252 "sd_done: sb[respc,sk,asc,"
1253 "ascq]=%x,%x,%x,%x\n",
1254 sshdr
.response_code
,
1255 sshdr
.sense_key
, sshdr
.asc
,
1259 if (driver_byte(result
) != DRIVER_SENSE
&&
1260 (!sense_valid
|| sense_deferred
))
1263 switch (sshdr
.sense_key
) {
1264 case HARDWARE_ERROR
:
1266 good_bytes
= sd_completed_bytes(SCpnt
);
1268 case RECOVERED_ERROR
:
1269 good_bytes
= scsi_bufflen(SCpnt
);
1272 /* This indicates a false check condition, so ignore it. An
1273 * unknown amount of data was transferred so treat it as an
1276 scsi_print_sense("sd", SCpnt
);
1278 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1280 case ABORTED_COMMAND
: /* DIF: Target detected corruption */
1281 case ILLEGAL_REQUEST
: /* DIX: Host detected corruption */
1282 if (sshdr
.asc
== 0x10)
1283 good_bytes
= sd_completed_bytes(SCpnt
);
1289 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1290 sd_dif_complete(SCpnt
, good_bytes
);
1292 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1293 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1295 /* We have to print a failed command here as the
1296 * extended CDB gets freed before scsi_io_completion()
1300 scsi_print_command(SCpnt
);
1302 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1310 static int media_not_present(struct scsi_disk
*sdkp
,
1311 struct scsi_sense_hdr
*sshdr
)
1314 if (!scsi_sense_valid(sshdr
))
1316 /* not invoked for commands that could return deferred errors */
1317 if (sshdr
->sense_key
!= NOT_READY
&&
1318 sshdr
->sense_key
!= UNIT_ATTENTION
)
1320 if (sshdr
->asc
!= 0x3A) /* medium not present */
1323 set_media_not_present(sdkp
);
1328 * spinup disk - called only in sd_revalidate_disk()
1331 sd_spinup_disk(struct scsi_disk
*sdkp
)
1333 unsigned char cmd
[10];
1334 unsigned long spintime_expire
= 0;
1335 int retries
, spintime
;
1336 unsigned int the_result
;
1337 struct scsi_sense_hdr sshdr
;
1338 int sense_valid
= 0;
1342 /* Spin up drives, as required. Only do this at boot time */
1343 /* Spinup needs to be done for module loads too. */
1348 cmd
[0] = TEST_UNIT_READY
;
1349 memset((void *) &cmd
[1], 0, 9);
1351 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1354 SD_MAX_RETRIES
, NULL
);
1357 * If the drive has indicated to us that it
1358 * doesn't have any media in it, don't bother
1359 * with any more polling.
1361 if (media_not_present(sdkp
, &sshdr
))
1365 sense_valid
= scsi_sense_valid(&sshdr
);
1367 } while (retries
< 3 &&
1368 (!scsi_status_is_good(the_result
) ||
1369 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1370 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1372 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1373 /* no sense, TUR either succeeded or failed
1374 * with a status error */
1375 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1376 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1377 sd_print_result(sdkp
, the_result
);
1383 * The device does not want the automatic start to be issued.
1385 if (sdkp
->device
->no_start_on_add
)
1388 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1389 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1390 break; /* manual intervention required */
1391 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1392 break; /* standby */
1393 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1394 break; /* unavailable */
1396 * Issue command to spin up drive when not ready
1399 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1400 cmd
[0] = START_STOP
;
1401 cmd
[1] = 1; /* Return immediately */
1402 memset((void *) &cmd
[2], 0, 8);
1403 cmd
[4] = 1; /* Start spin cycle */
1404 if (sdkp
->device
->start_stop_pwr_cond
)
1406 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1408 SD_TIMEOUT
, SD_MAX_RETRIES
,
1410 spintime_expire
= jiffies
+ 100 * HZ
;
1413 /* Wait 1 second for next try */
1418 * Wait for USB flash devices with slow firmware.
1419 * Yes, this sense key/ASC combination shouldn't
1420 * occur here. It's characteristic of these devices.
1422 } else if (sense_valid
&&
1423 sshdr
.sense_key
== UNIT_ATTENTION
&&
1424 sshdr
.asc
== 0x28) {
1426 spintime_expire
= jiffies
+ 5 * HZ
;
1429 /* Wait 1 second for next try */
1432 /* we don't understand the sense code, so it's
1433 * probably pointless to loop */
1435 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1436 sd_print_sense_hdr(sdkp
, &sshdr
);
1441 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1444 if (scsi_status_is_good(the_result
))
1447 printk("not responding...\n");
1453 * Determine whether disk supports Data Integrity Field.
1455 static void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1457 struct scsi_device
*sdp
= sdkp
->device
;
1460 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1463 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1465 if (type
== sdkp
->protection_type
|| !sdkp
->first_scan
)
1468 sdkp
->protection_type
= type
;
1470 if (type
> SD_DIF_TYPE3_PROTECTION
) {
1471 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported " \
1472 "protection type %u. Disabling disk!\n", type
);
1477 if (scsi_host_dif_capable(sdp
->host
, type
))
1478 sd_printk(KERN_NOTICE
, sdkp
,
1479 "Enabling DIF Type %u protection\n", type
);
1481 sd_printk(KERN_NOTICE
, sdkp
,
1482 "Disabling DIF Type %u protection\n", type
);
1485 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1486 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1489 sd_print_result(sdkp
, the_result
);
1490 if (driver_byte(the_result
) & DRIVER_SENSE
)
1491 sd_print_sense_hdr(sdkp
, sshdr
);
1493 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1496 * Set dirty bit for removable devices if not ready -
1497 * sometimes drives will not report this properly.
1499 if (sdp
->removable
&&
1500 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1504 * We used to set media_present to 0 here to indicate no media
1505 * in the drive, but some drives fail read capacity even with
1506 * media present, so we can't do that.
1508 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1512 #if RC16_LEN > SD_BUF_SIZE
1513 #error RC16_LEN must not be more than SD_BUF_SIZE
1516 #define READ_CAPACITY_RETRIES_ON_RESET 10
1518 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1519 unsigned char *buffer
)
1521 unsigned char cmd
[16];
1522 struct scsi_sense_hdr sshdr
;
1523 int sense_valid
= 0;
1525 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1526 unsigned int alignment
;
1527 unsigned long long lba
;
1528 unsigned sector_size
;
1530 if (sdp
->no_read_capacity_16
)
1535 cmd
[0] = SERVICE_ACTION_IN
;
1536 cmd
[1] = SAI_READ_CAPACITY_16
;
1538 memset(buffer
, 0, RC16_LEN
);
1540 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1541 buffer
, RC16_LEN
, &sshdr
,
1542 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1544 if (media_not_present(sdkp
, &sshdr
))
1548 sense_valid
= scsi_sense_valid(&sshdr
);
1550 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1551 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1553 /* Invalid Command Operation Code or
1554 * Invalid Field in CDB, just retry
1555 * silently with RC10 */
1558 sshdr
.sense_key
== UNIT_ATTENTION
&&
1559 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1560 /* Device reset might occur several times,
1561 * give it one more chance */
1562 if (--reset_retries
> 0)
1567 } while (the_result
&& retries
);
1570 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1571 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1575 sector_size
= get_unaligned_be32(&buffer
[8]);
1576 lba
= get_unaligned_be64(&buffer
[0]);
1578 sd_read_protection_type(sdkp
, buffer
);
1580 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1581 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1582 "kernel compiled with support for large block "
1588 /* Logical blocks per physical block exponent */
1589 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1591 /* Lowest aligned logical block */
1592 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1593 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1594 if (alignment
&& sdkp
->first_scan
)
1595 sd_printk(KERN_NOTICE
, sdkp
,
1596 "physical block alignment offset: %u\n", alignment
);
1598 if (buffer
[14] & 0x80) { /* TPE */
1599 struct request_queue
*q
= sdp
->request_queue
;
1601 sdkp
->thin_provisioning
= 1;
1602 q
->limits
.discard_granularity
= sdkp
->physical_block_size
;
1603 q
->limits
.max_discard_sectors
= 0xffffffff;
1605 if (buffer
[14] & 0x40) /* TPRZ */
1606 q
->limits
.discard_zeroes_data
= 1;
1608 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
1611 sdkp
->capacity
= lba
+ 1;
1615 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1616 unsigned char *buffer
)
1618 unsigned char cmd
[16];
1619 struct scsi_sense_hdr sshdr
;
1620 int sense_valid
= 0;
1622 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1624 unsigned sector_size
;
1627 cmd
[0] = READ_CAPACITY
;
1628 memset(&cmd
[1], 0, 9);
1629 memset(buffer
, 0, 8);
1631 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1633 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1635 if (media_not_present(sdkp
, &sshdr
))
1639 sense_valid
= scsi_sense_valid(&sshdr
);
1641 sshdr
.sense_key
== UNIT_ATTENTION
&&
1642 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1643 /* Device reset might occur several times,
1644 * give it one more chance */
1645 if (--reset_retries
> 0)
1650 } while (the_result
&& retries
);
1653 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1654 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1658 sector_size
= get_unaligned_be32(&buffer
[4]);
1659 lba
= get_unaligned_be32(&buffer
[0]);
1661 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
1662 /* Some buggy (usb cardreader) devices return an lba of
1663 0xffffffff when the want to report a size of 0 (with
1664 which they really mean no media is present) */
1666 sdkp
->physical_block_size
= sector_size
;
1670 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1671 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1672 "kernel compiled with support for large block "
1678 sdkp
->capacity
= lba
+ 1;
1679 sdkp
->physical_block_size
= sector_size
;
1683 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1685 if (sdp
->host
->max_cmd_len
< 16)
1687 if (sdp
->scsi_level
> SCSI_SPC_2
)
1689 if (scsi_device_protection(sdp
))
1695 * read disk capacity
1698 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1701 struct scsi_device
*sdp
= sdkp
->device
;
1702 sector_t old_capacity
= sdkp
->capacity
;
1704 if (sd_try_rc16_first(sdp
)) {
1705 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1706 if (sector_size
== -EOVERFLOW
)
1708 if (sector_size
== -ENODEV
)
1710 if (sector_size
< 0)
1711 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1712 if (sector_size
< 0)
1715 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1716 if (sector_size
== -EOVERFLOW
)
1718 if (sector_size
< 0)
1720 if ((sizeof(sdkp
->capacity
) > 4) &&
1721 (sdkp
->capacity
> 0xffffffffULL
)) {
1722 int old_sector_size
= sector_size
;
1723 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1724 "Trying to use READ CAPACITY(16).\n");
1725 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1726 if (sector_size
< 0) {
1727 sd_printk(KERN_NOTICE
, sdkp
,
1728 "Using 0xffffffff as device size\n");
1729 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1730 sector_size
= old_sector_size
;
1736 /* Some devices are known to return the total number of blocks,
1737 * not the highest block number. Some devices have versions
1738 * which do this and others which do not. Some devices we might
1739 * suspect of doing this but we don't know for certain.
1741 * If we know the reported capacity is wrong, decrement it. If
1742 * we can only guess, then assume the number of blocks is even
1743 * (usually true but not always) and err on the side of lowering
1746 if (sdp
->fix_capacity
||
1747 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1748 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1749 "from its reported value: %llu\n",
1750 (unsigned long long) sdkp
->capacity
);
1755 if (sector_size
== 0) {
1757 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1761 if (sector_size
!= 512 &&
1762 sector_size
!= 1024 &&
1763 sector_size
!= 2048 &&
1764 sector_size
!= 4096 &&
1765 sector_size
!= 256) {
1766 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1769 * The user might want to re-format the drive with
1770 * a supported sectorsize. Once this happens, it
1771 * would be relatively trivial to set the thing up.
1772 * For this reason, we leave the thing in the table.
1776 * set a bogus sector size so the normal read/write
1777 * logic in the block layer will eventually refuse any
1778 * request on this device without tripping over power
1779 * of two sector size assumptions
1783 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
1786 char cap_str_2
[10], cap_str_10
[10];
1787 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1789 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1791 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1792 sizeof(cap_str_10
));
1794 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
1795 sd_printk(KERN_NOTICE
, sdkp
,
1796 "%llu %d-byte logical blocks: (%s/%s)\n",
1797 (unsigned long long)sdkp
->capacity
,
1798 sector_size
, cap_str_10
, cap_str_2
);
1800 if (sdkp
->physical_block_size
!= sector_size
)
1801 sd_printk(KERN_NOTICE
, sdkp
,
1802 "%u-byte physical blocks\n",
1803 sdkp
->physical_block_size
);
1807 /* Rescale capacity to 512-byte units */
1808 if (sector_size
== 4096)
1809 sdkp
->capacity
<<= 3;
1810 else if (sector_size
== 2048)
1811 sdkp
->capacity
<<= 2;
1812 else if (sector_size
== 1024)
1813 sdkp
->capacity
<<= 1;
1814 else if (sector_size
== 256)
1815 sdkp
->capacity
>>= 1;
1817 blk_queue_physical_block_size(sdp
->request_queue
,
1818 sdkp
->physical_block_size
);
1819 sdkp
->device
->sector_size
= sector_size
;
1822 /* called with buffer of length 512 */
1824 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1825 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1826 struct scsi_sense_hdr
*sshdr
)
1828 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1829 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1834 * read write protect setting, if possible - called only in sd_revalidate_disk()
1835 * called with buffer of length SD_BUF_SIZE
1838 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1841 struct scsi_device
*sdp
= sdkp
->device
;
1842 struct scsi_mode_data data
;
1843 int old_wp
= sdkp
->write_prot
;
1845 set_disk_ro(sdkp
->disk
, 0);
1846 if (sdp
->skip_ms_page_3f
) {
1847 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1851 if (sdp
->use_192_bytes_for_3f
) {
1852 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1855 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1856 * We have to start carefully: some devices hang if we ask
1857 * for more than is available.
1859 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1862 * Second attempt: ask for page 0 When only page 0 is
1863 * implemented, a request for page 3F may return Sense Key
1864 * 5: Illegal Request, Sense Code 24: Invalid field in
1867 if (!scsi_status_is_good(res
))
1868 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1871 * Third attempt: ask 255 bytes, as we did earlier.
1873 if (!scsi_status_is_good(res
))
1874 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1878 if (!scsi_status_is_good(res
)) {
1879 sd_printk(KERN_WARNING
, sdkp
,
1880 "Test WP failed, assume Write Enabled\n");
1882 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1883 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1884 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
1885 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1886 sdkp
->write_prot
? "on" : "off");
1887 sd_printk(KERN_DEBUG
, sdkp
,
1888 "Mode Sense: %02x %02x %02x %02x\n",
1889 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1895 * sd_read_cache_type - called only from sd_revalidate_disk()
1896 * called with buffer of length SD_BUF_SIZE
1899 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1902 struct scsi_device
*sdp
= sdkp
->device
;
1906 struct scsi_mode_data data
;
1907 struct scsi_sense_hdr sshdr
;
1908 int old_wce
= sdkp
->WCE
;
1909 int old_rcd
= sdkp
->RCD
;
1910 int old_dpofua
= sdkp
->DPOFUA
;
1912 if (sdp
->skip_ms_page_8
)
1915 if (sdp
->type
== TYPE_RBC
) {
1923 /* cautiously ask */
1924 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1926 if (!scsi_status_is_good(res
))
1929 if (!data
.header_length
) {
1931 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1934 /* that went OK, now ask for the proper length */
1938 * We're only interested in the first three bytes, actually.
1939 * But the data cache page is defined for the first 20.
1946 /* Take headers and block descriptors into account */
1947 len
+= data
.header_length
+ data
.block_descriptor_length
;
1948 if (len
> SD_BUF_SIZE
)
1952 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1954 if (scsi_status_is_good(res
)) {
1955 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1957 if (offset
>= SD_BUF_SIZE
- 2) {
1958 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1962 if ((buffer
[offset
] & 0x3f) != modepage
) {
1963 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1967 if (modepage
== 8) {
1968 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1969 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1971 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1975 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1976 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1977 sd_printk(KERN_NOTICE
, sdkp
,
1978 "Uses READ/WRITE(6), disabling FUA\n");
1982 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
1983 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
1984 sd_printk(KERN_NOTICE
, sdkp
,
1985 "Write cache: %s, read cache: %s, %s\n",
1986 sdkp
->WCE
? "enabled" : "disabled",
1987 sdkp
->RCD
? "disabled" : "enabled",
1988 sdkp
->DPOFUA
? "supports DPO and FUA"
1989 : "doesn't support DPO or FUA");
1995 if (scsi_sense_valid(&sshdr
) &&
1996 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1997 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1998 /* Invalid field in CDB */
1999 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
2001 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
2004 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
2011 * The ATO bit indicates whether the DIF application tag is available
2012 * for use by the operating system.
2014 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2017 struct scsi_device
*sdp
= sdkp
->device
;
2018 struct scsi_mode_data data
;
2019 struct scsi_sense_hdr sshdr
;
2021 if (sdp
->type
!= TYPE_DISK
)
2024 if (sdkp
->protection_type
== 0)
2027 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2028 SD_MAX_RETRIES
, &data
, &sshdr
);
2030 if (!scsi_status_is_good(res
) || !data
.header_length
||
2032 sd_printk(KERN_WARNING
, sdkp
,
2033 "getting Control mode page failed, assume no ATO\n");
2035 if (scsi_sense_valid(&sshdr
))
2036 sd_print_sense_hdr(sdkp
, &sshdr
);
2041 offset
= data
.header_length
+ data
.block_descriptor_length
;
2043 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2044 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2048 if ((buffer
[offset
+ 5] & 0x80) == 0)
2057 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2058 * @disk: disk to query
2060 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2062 struct request_queue
*q
= sdkp
->disk
->queue
;
2063 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2064 const int vpd_len
= 64;
2065 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2068 /* Block Limits VPD */
2069 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2072 blk_queue_io_min(sdkp
->disk
->queue
,
2073 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2074 blk_queue_io_opt(sdkp
->disk
->queue
,
2075 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2077 /* Thin provisioning enabled and page length indicates TP support */
2078 if (sdkp
->thin_provisioning
&& buffer
[3] == 0x3c) {
2079 unsigned int lba_count
, desc_count
, granularity
;
2081 lba_count
= get_unaligned_be32(&buffer
[20]);
2082 desc_count
= get_unaligned_be32(&buffer
[24]);
2084 if (lba_count
&& desc_count
) {
2085 if (sdkp
->tpvpd
&& !sdkp
->tpu
)
2091 if (sdkp
->tpvpd
&& !sdkp
->tpu
&& !sdkp
->tpws
) {
2092 sd_printk(KERN_ERR
, sdkp
, "Thin provisioning is " \
2093 "enabled but neither TPU, nor TPWS are " \
2094 "set. Disabling discard!\n");
2099 q
->limits
.max_discard_sectors
=
2100 lba_count
* sector_sz
>> 9;
2102 granularity
= get_unaligned_be32(&buffer
[28]);
2105 q
->limits
.discard_granularity
= granularity
* sector_sz
;
2107 if (buffer
[32] & 0x80)
2108 q
->limits
.discard_alignment
=
2109 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2117 * sd_read_block_characteristics - Query block dev. characteristics
2118 * @disk: disk to query
2120 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2122 unsigned char *buffer
;
2124 const int vpd_len
= 64;
2126 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2129 /* Block Device Characteristics VPD */
2130 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2133 rot
= get_unaligned_be16(&buffer
[4]);
2136 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2143 * sd_read_thin_provisioning - Query thin provisioning VPD page
2144 * @disk: disk to query
2146 static void sd_read_thin_provisioning(struct scsi_disk
*sdkp
)
2148 unsigned char *buffer
;
2149 const int vpd_len
= 8;
2151 if (sdkp
->thin_provisioning
== 0)
2154 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2156 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2160 sdkp
->tpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2161 sdkp
->tpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2167 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2170 * Although VPD inquiries can go to SCSI-2 type devices,
2171 * some USB ones crash on receiving them, and the pages
2172 * we currently ask for are for SPC-3 and beyond
2174 if (sdp
->scsi_level
> SCSI_SPC_2
)
2180 * sd_revalidate_disk - called the first time a new disk is seen,
2181 * performs disk spin up, read_capacity, etc.
2182 * @disk: struct gendisk we care about
2184 static int sd_revalidate_disk(struct gendisk
*disk
)
2186 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2187 struct scsi_device
*sdp
= sdkp
->device
;
2188 unsigned char *buffer
;
2191 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2192 "sd_revalidate_disk\n"));
2195 * If the device is offline, don't try and read capacity or any
2196 * of the other niceties.
2198 if (!scsi_device_online(sdp
))
2201 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2203 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2204 "allocation failure.\n");
2208 sd_spinup_disk(sdkp
);
2211 * Without media there is no reason to ask; moreover, some devices
2212 * react badly if we do.
2214 if (sdkp
->media_present
) {
2215 sd_read_capacity(sdkp
, buffer
);
2217 if (sd_try_extended_inquiry(sdp
)) {
2218 sd_read_thin_provisioning(sdkp
);
2219 sd_read_block_limits(sdkp
);
2220 sd_read_block_characteristics(sdkp
);
2223 sd_read_write_protect_flag(sdkp
, buffer
);
2224 sd_read_cache_type(sdkp
, buffer
);
2225 sd_read_app_tag_own(sdkp
, buffer
);
2228 sdkp
->first_scan
= 0;
2231 * We now have all cache related info, determine how we deal
2232 * with flush requests.
2240 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2242 set_capacity(disk
, sdkp
->capacity
);
2250 * sd_unlock_native_capacity - unlock native capacity
2251 * @disk: struct gendisk to set capacity for
2253 * Block layer calls this function if it detects that partitions
2254 * on @disk reach beyond the end of the device. If the SCSI host
2255 * implements ->unlock_native_capacity() method, it's invoked to
2256 * give it a chance to adjust the device capacity.
2259 * Defined by block layer. Might sleep.
2261 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2263 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2265 if (sdev
->host
->hostt
->unlock_native_capacity
)
2266 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2270 * sd_format_disk_name - format disk name
2271 * @prefix: name prefix - ie. "sd" for SCSI disks
2272 * @index: index of the disk to format name for
2273 * @buf: output buffer
2274 * @buflen: length of the output buffer
2276 * SCSI disk names starts at sda. The 26th device is sdz and the
2277 * 27th is sdaa. The last one for two lettered suffix is sdzz
2278 * which is followed by sdaaa.
2280 * This is basically 26 base counting with one extra 'nil' entry
2281 * at the beginning from the second digit on and can be
2282 * determined using similar method as 26 base conversion with the
2283 * index shifted -1 after each digit is computed.
2289 * 0 on success, -errno on failure.
2291 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2293 const int base
= 'z' - 'a' + 1;
2294 char *begin
= buf
+ strlen(prefix
);
2295 char *end
= buf
+ buflen
;
2305 *--p
= 'a' + (index
% unit
);
2306 index
= (index
/ unit
) - 1;
2307 } while (index
>= 0);
2309 memmove(begin
, p
, end
- p
);
2310 memcpy(buf
, prefix
, strlen(prefix
));
2316 * The asynchronous part of sd_probe
2318 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2320 struct scsi_disk
*sdkp
= data
;
2321 struct scsi_device
*sdp
;
2328 index
= sdkp
->index
;
2329 dev
= &sdp
->sdev_gendev
;
2331 gd
->major
= sd_major((index
& 0xf0) >> 4);
2332 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2333 gd
->minors
= SD_MINORS
;
2335 gd
->fops
= &sd_fops
;
2336 gd
->private_data
= &sdkp
->driver
;
2337 gd
->queue
= sdkp
->device
->request_queue
;
2339 /* defaults, until the device tells us otherwise */
2340 sdp
->sector_size
= 512;
2342 sdkp
->media_present
= 1;
2343 sdkp
->write_prot
= 0;
2347 sdkp
->first_scan
= 1;
2349 sd_revalidate_disk(gd
);
2351 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2352 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2354 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2355 gd
->flags
= GENHD_FL_EXT_DEVT
;
2357 gd
->flags
|= GENHD_FL_REMOVABLE
;
2360 sd_dif_config_host(sdkp
);
2362 sd_revalidate_disk(gd
);
2364 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2365 sdp
->removable
? "removable " : "");
2366 scsi_autopm_put_device(sdp
);
2367 put_device(&sdkp
->dev
);
2371 * sd_probe - called during driver initialization and whenever a
2372 * new scsi device is attached to the system. It is called once
2373 * for each scsi device (not just disks) present.
2374 * @dev: pointer to device object
2376 * Returns 0 if successful (or not interested in this scsi device
2377 * (e.g. scanner)); 1 when there is an error.
2379 * Note: this function is invoked from the scsi mid-level.
2380 * This function sets up the mapping between a given
2381 * <host,channel,id,lun> (found in sdp) and new device name
2382 * (e.g. /dev/sda). More precisely it is the block device major
2383 * and minor number that is chosen here.
2385 * Assume sd_attach is not re-entrant (for time being)
2386 * Also think about sd_attach() and sd_remove() running coincidentally.
2388 static int sd_probe(struct device
*dev
)
2390 struct scsi_device
*sdp
= to_scsi_device(dev
);
2391 struct scsi_disk
*sdkp
;
2397 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2400 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2404 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2408 gd
= alloc_disk(SD_MINORS
);
2413 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2416 spin_lock(&sd_index_lock
);
2417 error
= ida_get_new(&sd_index_ida
, &index
);
2418 spin_unlock(&sd_index_lock
);
2419 } while (error
== -EAGAIN
);
2424 if (index
>= SD_MAX_DISKS
) {
2426 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name space exhausted.\n");
2427 goto out_free_index
;
2430 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2432 goto out_free_index
;
2435 sdkp
->driver
= &sd_template
;
2437 sdkp
->index
= index
;
2438 atomic_set(&sdkp
->openers
, 0);
2439 sdkp
->previous_state
= 1;
2441 if (!sdp
->request_queue
->rq_timeout
) {
2442 if (sdp
->type
!= TYPE_MOD
)
2443 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2445 blk_queue_rq_timeout(sdp
->request_queue
,
2449 device_initialize(&sdkp
->dev
);
2450 sdkp
->dev
.parent
= dev
;
2451 sdkp
->dev
.class = &sd_disk_class
;
2452 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2454 if (device_add(&sdkp
->dev
))
2455 goto out_free_index
;
2458 dev_set_drvdata(dev
, sdkp
);
2460 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2461 async_schedule(sd_probe_async
, sdkp
);
2466 spin_lock(&sd_index_lock
);
2467 ida_remove(&sd_index_ida
, index
);
2468 spin_unlock(&sd_index_lock
);
2478 * sd_remove - called whenever a scsi disk (previously recognized by
2479 * sd_probe) is detached from the system. It is called (potentially
2480 * multiple times) during sd module unload.
2481 * @sdp: pointer to mid level scsi device object
2483 * Note: this function is invoked from the scsi mid-level.
2484 * This function potentially frees up a device name (e.g. /dev/sdc)
2485 * that could be re-used by a subsequent sd_probe().
2486 * This function is not called when the built-in sd driver is "exit-ed".
2488 static int sd_remove(struct device
*dev
)
2490 struct scsi_disk
*sdkp
;
2492 sdkp
= dev_get_drvdata(dev
);
2493 scsi_autopm_get_device(sdkp
->device
);
2495 async_synchronize_full();
2496 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2497 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2498 device_del(&sdkp
->dev
);
2499 del_gendisk(sdkp
->disk
);
2502 mutex_lock(&sd_ref_mutex
);
2503 dev_set_drvdata(dev
, NULL
);
2504 put_device(&sdkp
->dev
);
2505 mutex_unlock(&sd_ref_mutex
);
2511 * scsi_disk_release - Called to free the scsi_disk structure
2512 * @dev: pointer to embedded class device
2514 * sd_ref_mutex must be held entering this routine. Because it is
2515 * called on last put, you should always use the scsi_disk_get()
2516 * scsi_disk_put() helpers which manipulate the semaphore directly
2517 * and never do a direct put_device.
2519 static void scsi_disk_release(struct device
*dev
)
2521 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2522 struct gendisk
*disk
= sdkp
->disk
;
2524 spin_lock(&sd_index_lock
);
2525 ida_remove(&sd_index_ida
, sdkp
->index
);
2526 spin_unlock(&sd_index_lock
);
2528 disk
->private_data
= NULL
;
2530 put_device(&sdkp
->device
->sdev_gendev
);
2535 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2537 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2538 struct scsi_sense_hdr sshdr
;
2539 struct scsi_device
*sdp
= sdkp
->device
;
2543 cmd
[4] |= 1; /* START */
2545 if (sdp
->start_stop_pwr_cond
)
2546 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2548 if (!scsi_device_online(sdp
))
2551 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2552 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2554 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2555 sd_print_result(sdkp
, res
);
2556 if (driver_byte(res
) & DRIVER_SENSE
)
2557 sd_print_sense_hdr(sdkp
, &sshdr
);
2564 * Send a SYNCHRONIZE CACHE instruction down to the device through
2565 * the normal SCSI command structure. Wait for the command to
2568 static void sd_shutdown(struct device
*dev
)
2570 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2573 return; /* this can happen */
2576 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2577 sd_sync_cache(sdkp
);
2580 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2581 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2582 sd_start_stop_device(sdkp
, 0);
2585 scsi_disk_put(sdkp
);
2588 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2590 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2594 return 0; /* this can happen */
2597 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2598 ret
= sd_sync_cache(sdkp
);
2603 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2604 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2605 ret
= sd_start_stop_device(sdkp
, 0);
2609 scsi_disk_put(sdkp
);
2613 static int sd_resume(struct device
*dev
)
2615 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2618 if (!sdkp
->device
->manage_start_stop
)
2621 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2622 ret
= sd_start_stop_device(sdkp
, 1);
2625 scsi_disk_put(sdkp
);
2630 * init_sd - entry point for this driver (both when built in or when
2633 * Note: this function registers this driver with the scsi mid-level.
2635 static int __init
init_sd(void)
2637 int majors
= 0, i
, err
;
2639 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2641 for (i
= 0; i
< SD_MAJORS
; i
++)
2642 if (register_blkdev(sd_major(i
), "sd") == 0)
2648 err
= class_register(&sd_disk_class
);
2652 err
= scsi_register_driver(&sd_template
.gendrv
);
2656 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2658 if (!sd_cdb_cache
) {
2659 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2663 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2665 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2672 kmem_cache_destroy(sd_cdb_cache
);
2675 class_unregister(&sd_disk_class
);
2677 for (i
= 0; i
< SD_MAJORS
; i
++)
2678 unregister_blkdev(sd_major(i
), "sd");
2683 * exit_sd - exit point for this driver (when it is a module).
2685 * Note: this function unregisters this driver from the scsi mid-level.
2687 static void __exit
exit_sd(void)
2691 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2693 mempool_destroy(sd_cdb_pool
);
2694 kmem_cache_destroy(sd_cdb_cache
);
2696 scsi_unregister_driver(&sd_template
.gendrv
);
2697 class_unregister(&sd_disk_class
);
2699 for (i
= 0; i
< SD_MAJORS
; i
++)
2700 unregister_blkdev(sd_major(i
), "sd");
2703 module_init(init_sd
);
2704 module_exit(exit_sd
);
2706 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2707 struct scsi_sense_hdr
*sshdr
)
2709 sd_printk(KERN_INFO
, sdkp
, " ");
2710 scsi_show_sense_hdr(sshdr
);
2711 sd_printk(KERN_INFO
, sdkp
, " ");
2712 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2715 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2717 sd_printk(KERN_INFO
, sdkp
, " ");
2718 scsi_show_result(result
);