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/smp_lock.h>
50 #include <linux/mutex.h>
51 #include <linux/string_helpers.h>
52 #include <linux/async.h>
53 #include <linux/slab.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_logging.h"
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
100 static int sd_revalidate_disk(struct gendisk
*);
101 static void sd_unlock_native_capacity(struct gendisk
*disk
);
102 static int sd_probe(struct device
*);
103 static int sd_remove(struct device
*);
104 static void sd_shutdown(struct device
*);
105 static int sd_suspend(struct device
*, pm_message_t state
);
106 static int sd_resume(struct device
*);
107 static void sd_rescan(struct device
*);
108 static int sd_done(struct scsi_cmnd
*);
109 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
110 static void scsi_disk_release(struct device
*cdev
);
111 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
112 static void sd_print_result(struct scsi_disk
*, int);
114 static DEFINE_SPINLOCK(sd_index_lock
);
115 static DEFINE_IDA(sd_index_ida
);
117 /* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
120 static DEFINE_MUTEX(sd_ref_mutex
);
122 struct kmem_cache
*sd_cdb_cache
;
123 mempool_t
*sd_cdb_pool
;
125 static const char *sd_cache_types
[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
131 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
132 const char *buf
, size_t count
)
134 int i
, ct
= -1, rcd
, wce
, sp
;
135 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
136 struct scsi_device
*sdp
= sdkp
->device
;
139 struct scsi_mode_data data
;
140 struct scsi_sense_hdr sshdr
;
143 if (sdp
->type
!= TYPE_DISK
)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
149 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
150 const int len
= strlen(sd_cache_types
[i
]);
151 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
159 rcd
= ct
& 0x01 ? 1 : 0;
160 wce
= ct
& 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
162 SD_MAX_RETRIES
, &data
, NULL
))
164 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
165 data
.block_descriptor_length
);
166 buffer_data
= buffer
+ data
.header_length
+
167 data
.block_descriptor_length
;
168 buffer_data
[2] &= ~0x05;
169 buffer_data
[2] |= wce
<< 2 | rcd
;
170 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
172 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
173 SD_MAX_RETRIES
, &data
, &sshdr
)) {
174 if (scsi_sense_valid(&sshdr
))
175 sd_print_sense_hdr(sdkp
, &sshdr
);
178 revalidate_disk(sdkp
->disk
);
183 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
184 const char *buf
, size_t count
)
186 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
187 struct scsi_device
*sdp
= sdkp
->device
;
189 if (!capable(CAP_SYS_ADMIN
))
192 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
198 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
199 const char *buf
, size_t count
)
201 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
202 struct scsi_device
*sdp
= sdkp
->device
;
204 if (!capable(CAP_SYS_ADMIN
))
207 if (sdp
->type
!= TYPE_DISK
)
210 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
216 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
219 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
220 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
222 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
226 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
228 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
230 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
234 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
237 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
238 struct scsi_device
*sdp
= sdkp
->device
;
240 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
244 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
247 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
249 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
253 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
256 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
258 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
262 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
265 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
267 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
271 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
274 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
276 return snprintf(buf
, 20, "%u\n", sdkp
->thin_provisioning
);
279 static struct device_attribute sd_disk_attrs
[] = {
280 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
281 sd_store_cache_type
),
282 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
283 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
284 sd_store_allow_restart
),
285 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
286 sd_store_manage_start_stop
),
287 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
288 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
289 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
293 static struct class sd_disk_class
= {
295 .owner
= THIS_MODULE
,
296 .dev_release
= scsi_disk_release
,
297 .dev_attrs
= sd_disk_attrs
,
300 static struct scsi_driver sd_template
= {
301 .owner
= THIS_MODULE
,
306 .suspend
= sd_suspend
,
308 .shutdown
= sd_shutdown
,
315 * Device no to disk mapping:
317 * major disc2 disc p1
318 * |............|.............|....|....| <- dev_t
321 * Inside a major, we have 16k disks, however mapped non-
322 * contiguously. The first 16 disks are for major0, the next
323 * ones with major1, ... Disk 256 is for major0 again, disk 272
325 * As we stay compatible with our numbering scheme, we can reuse
326 * the well-know SCSI majors 8, 65--71, 136--143.
328 static int sd_major(int major_idx
)
332 return SCSI_DISK0_MAJOR
;
334 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
336 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
339 return 0; /* shut up gcc */
343 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
345 struct scsi_disk
*sdkp
= NULL
;
347 if (disk
->private_data
) {
348 sdkp
= scsi_disk(disk
);
349 if (scsi_device_get(sdkp
->device
) == 0)
350 get_device(&sdkp
->dev
);
357 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
359 struct scsi_disk
*sdkp
;
361 mutex_lock(&sd_ref_mutex
);
362 sdkp
= __scsi_disk_get(disk
);
363 mutex_unlock(&sd_ref_mutex
);
367 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
369 struct scsi_disk
*sdkp
;
371 mutex_lock(&sd_ref_mutex
);
372 sdkp
= dev_get_drvdata(dev
);
374 sdkp
= __scsi_disk_get(sdkp
->disk
);
375 mutex_unlock(&sd_ref_mutex
);
379 static void scsi_disk_put(struct scsi_disk
*sdkp
)
381 struct scsi_device
*sdev
= sdkp
->device
;
383 mutex_lock(&sd_ref_mutex
);
384 put_device(&sdkp
->dev
);
385 scsi_device_put(sdev
);
386 mutex_unlock(&sd_ref_mutex
);
389 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
391 unsigned int prot_op
= SCSI_PROT_NORMAL
;
392 unsigned int dix
= scsi_prot_sg_count(scmd
);
394 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
396 prot_op
= SCSI_PROT_READ_PASS
;
397 else if (dif
&& !dix
)
398 prot_op
= SCSI_PROT_READ_STRIP
;
399 else if (!dif
&& dix
)
400 prot_op
= SCSI_PROT_READ_INSERT
;
403 prot_op
= SCSI_PROT_WRITE_PASS
;
404 else if (dif
&& !dix
)
405 prot_op
= SCSI_PROT_WRITE_INSERT
;
406 else if (!dif
&& dix
)
407 prot_op
= SCSI_PROT_WRITE_STRIP
;
410 scsi_set_prot_op(scmd
, prot_op
);
411 scsi_set_prot_type(scmd
, dif
);
415 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
416 * @sdp: scsi device to operate one
417 * @rq: Request to prepare
419 * Will issue either UNMAP or WRITE SAME(16) depending on preference
420 * indicated by target device.
422 static int scsi_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
424 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
425 struct bio
*bio
= rq
->bio
;
426 sector_t sector
= bio
->bi_sector
;
427 unsigned int nr_sectors
= bio_sectors(bio
);
432 if (sdkp
->device
->sector_size
== 4096) {
437 rq
->timeout
= SD_TIMEOUT
;
439 memset(rq
->cmd
, 0, rq
->cmd_len
);
441 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
443 return BLKPREP_DEFER
;
446 char *buf
= page_address(page
);
452 put_unaligned_be16(6 + 16, &buf
[0]);
453 put_unaligned_be16(16, &buf
[2]);
454 put_unaligned_be64(sector
, &buf
[8]);
455 put_unaligned_be32(nr_sectors
, &buf
[16]);
460 rq
->cmd
[0] = WRITE_SAME_16
;
461 rq
->cmd
[1] = 0x8; /* UNMAP */
462 put_unaligned_be64(sector
, &rq
->cmd
[2]);
463 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
465 len
= sdkp
->device
->sector_size
;
468 blk_add_request_payload(rq
, page
, len
);
469 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
470 rq
->buffer
= page_address(page
);
471 if (ret
!= BLKPREP_OK
) {
478 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
480 rq
->timeout
= SD_TIMEOUT
;
481 rq
->retries
= SD_MAX_RETRIES
;
482 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
485 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
488 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
490 if (rq
->cmd_flags
& REQ_DISCARD
) {
491 free_page((unsigned long)rq
->buffer
);
497 * sd_init_command - build a scsi (read or write) command from
498 * information in the request structure.
499 * @SCpnt: pointer to mid-level's per scsi command structure that
500 * contains request and into which the scsi command is written
502 * Returns 1 if successful and 0 if error (or cannot be done now).
504 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
506 struct scsi_cmnd
*SCpnt
;
507 struct scsi_device
*sdp
= q
->queuedata
;
508 struct gendisk
*disk
= rq
->rq_disk
;
509 struct scsi_disk
*sdkp
;
510 sector_t block
= blk_rq_pos(rq
);
512 unsigned int this_count
= blk_rq_sectors(rq
);
514 unsigned char protect
;
517 * Discard request come in as REQ_TYPE_FS but we turn them into
518 * block PC requests to make life easier.
520 if (rq
->cmd_flags
& REQ_DISCARD
) {
521 ret
= scsi_setup_discard_cmnd(sdp
, rq
);
523 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
524 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
526 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
527 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
529 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
533 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
534 if (ret
!= BLKPREP_OK
)
537 sdkp
= scsi_disk(disk
);
539 /* from here on until we're complete, any goto out
540 * is used for a killable error condition */
543 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
544 "sd_init_command: block=%llu, "
546 (unsigned long long)block
,
549 if (!sdp
|| !scsi_device_online(sdp
) ||
550 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
551 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
552 "Finishing %u sectors\n",
553 blk_rq_sectors(rq
)));
554 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
555 "Retry with 0x%p\n", SCpnt
));
561 * quietly refuse to do anything to a changed disc until
562 * the changed bit has been reset
564 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
569 * Some SD card readers can't handle multi-sector accesses which touch
570 * the last one or two hardware sectors. Split accesses as needed.
572 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
573 (sdp
->sector_size
/ 512);
575 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
576 if (block
< threshold
) {
577 /* Access up to the threshold but not beyond */
578 this_count
= threshold
- block
;
580 /* Access only a single hardware sector */
581 this_count
= sdp
->sector_size
/ 512;
585 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
586 (unsigned long long)block
));
589 * If we have a 1K hardware sectorsize, prevent access to single
590 * 512 byte sectors. In theory we could handle this - in fact
591 * the scsi cdrom driver must be able to handle this because
592 * we typically use 1K blocksizes, and cdroms typically have
593 * 2K hardware sectorsizes. Of course, things are simpler
594 * with the cdrom, since it is read-only. For performance
595 * reasons, the filesystems should be able to handle this
596 * and not force the scsi disk driver to use bounce buffers
599 if (sdp
->sector_size
== 1024) {
600 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
601 scmd_printk(KERN_ERR
, SCpnt
,
602 "Bad block number requested\n");
606 this_count
= this_count
>> 1;
609 if (sdp
->sector_size
== 2048) {
610 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
611 scmd_printk(KERN_ERR
, SCpnt
,
612 "Bad block number requested\n");
616 this_count
= this_count
>> 2;
619 if (sdp
->sector_size
== 4096) {
620 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
621 scmd_printk(KERN_ERR
, SCpnt
,
622 "Bad block number requested\n");
626 this_count
= this_count
>> 3;
629 if (rq_data_dir(rq
) == WRITE
) {
630 if (!sdp
->writeable
) {
633 SCpnt
->cmnd
[0] = WRITE_6
;
634 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
636 if (blk_integrity_rq(rq
) &&
637 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
640 } else if (rq_data_dir(rq
) == READ
) {
641 SCpnt
->cmnd
[0] = READ_6
;
642 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
644 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
648 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
649 "%s %d/%u 512 byte blocks.\n",
650 (rq_data_dir(rq
) == WRITE
) ?
651 "writing" : "reading", this_count
,
652 blk_rq_sectors(rq
)));
654 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
655 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
661 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
662 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
664 if (unlikely(SCpnt
->cmnd
== NULL
)) {
669 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
670 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
671 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
672 SCpnt
->cmnd
[7] = 0x18;
673 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
674 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
677 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
678 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
679 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
680 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
681 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
682 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
683 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
684 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
686 /* Expected Indirect LBA */
687 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
688 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
689 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
690 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
692 /* Transfer length */
693 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
694 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
695 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
696 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
697 } else if (block
> 0xffffffff) {
698 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
699 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
700 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
701 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
702 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
703 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
704 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
705 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
706 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
707 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
708 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
709 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
710 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
711 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
712 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
713 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
714 scsi_device_protection(SCpnt
->device
) ||
715 SCpnt
->device
->use_10_for_rw
) {
716 if (this_count
> 0xffff)
719 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
720 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
721 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
722 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
723 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
724 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
725 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
726 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
727 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
729 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
731 * This happens only if this drive failed
732 * 10byte rw command with ILLEGAL_REQUEST
733 * during operation and thus turned off
736 scmd_printk(KERN_ERR
, SCpnt
,
737 "FUA write on READ/WRITE(6) drive\n");
741 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
742 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
743 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
744 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
747 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
749 /* If DIF or DIX is enabled, tell HBA how to handle request */
750 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
751 sd_prot_op(SCpnt
, host_dif
);
754 * We shouldn't disconnect in the middle of a sector, so with a dumb
755 * host adapter, it's safe to assume that we can at least transfer
756 * this many bytes between each connect / disconnect.
758 SCpnt
->transfersize
= sdp
->sector_size
;
759 SCpnt
->underflow
= this_count
<< 9;
760 SCpnt
->allowed
= SD_MAX_RETRIES
;
763 * This indicates that the command is ready from our end to be
768 return scsi_prep_return(q
, rq
, ret
);
772 * sd_open - open a scsi disk device
773 * @inode: only i_rdev member may be used
774 * @filp: only f_mode and f_flags may be used
776 * Returns 0 if successful. Returns a negated errno value in case
779 * Note: This can be called from a user context (e.g. fsck(1) )
780 * or from within the kernel (e.g. as a result of a mount(1) ).
781 * In the latter case @inode and @filp carry an abridged amount
782 * of information as noted above.
784 * Locking: called with bdev->bd_mutex held.
786 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
788 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
789 struct scsi_device
*sdev
;
795 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
799 retval
= scsi_autopm_get_device(sdev
);
804 * If the device is in error recovery, wait until it is done.
805 * If the device is offline, then disallow any access to it.
808 if (!scsi_block_when_processing_errors(sdev
))
811 if (sdev
->removable
|| sdkp
->write_prot
)
812 check_disk_change(bdev
);
815 * If the drive is empty, just let the open fail.
818 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
822 * If the device has the write protect tab set, have the open fail
823 * if the user expects to be able to write to the thing.
826 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
830 * It is possible that the disk changing stuff resulted in
831 * the device being taken offline. If this is the case,
832 * report this to the user, and don't pretend that the
833 * open actually succeeded.
836 if (!scsi_device_online(sdev
))
839 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
840 if (scsi_block_when_processing_errors(sdev
))
841 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
847 scsi_autopm_put_device(sdev
);
854 * sd_release - invoked when the (last) close(2) is called on this
856 * @inode: only i_rdev member may be used
857 * @filp: only f_mode and f_flags may be used
861 * Note: may block (uninterruptible) if error recovery is underway
864 * Locking: called with bdev->bd_mutex held.
866 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
868 struct scsi_disk
*sdkp
= scsi_disk(disk
);
869 struct scsi_device
*sdev
= sdkp
->device
;
871 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
873 if (atomic_dec_return(&sdkp
->openers
) && sdev
->removable
) {
874 if (scsi_block_when_processing_errors(sdev
))
875 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
879 * XXX and what if there are packets in flight and this close()
880 * XXX is followed by a "rmmod sd_mod"?
883 scsi_autopm_put_device(sdev
);
888 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
890 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
891 struct scsi_device
*sdp
= sdkp
->device
;
892 struct Scsi_Host
*host
= sdp
->host
;
895 /* default to most commonly used values */
896 diskinfo
[0] = 0x40; /* 1 << 6 */
897 diskinfo
[1] = 0x20; /* 1 << 5 */
898 diskinfo
[2] = sdkp
->capacity
>> 11;
900 /* override with calculated, extended default, or driver values */
901 if (host
->hostt
->bios_param
)
902 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
904 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
906 geo
->heads
= diskinfo
[0];
907 geo
->sectors
= diskinfo
[1];
908 geo
->cylinders
= diskinfo
[2];
913 * sd_ioctl - process an ioctl
914 * @inode: only i_rdev/i_bdev members may be used
915 * @filp: only f_mode and f_flags may be used
916 * @cmd: ioctl command number
917 * @arg: this is third argument given to ioctl(2) system call.
918 * Often contains a pointer.
920 * Returns 0 if successful (some ioctls return postive numbers on
921 * success as well). Returns a negated errno value in case of error.
923 * Note: most ioctls are forward onto the block subsystem or further
924 * down in the scsi subsystem.
926 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
927 unsigned int cmd
, unsigned long arg
)
929 struct gendisk
*disk
= bdev
->bd_disk
;
930 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
931 void __user
*p
= (void __user
*)arg
;
934 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
935 disk
->disk_name
, cmd
));
938 * If we are in the middle of error recovery, don't let anyone
939 * else try and use this device. Also, if error recovery fails, it
940 * may try and take the device offline, in which case all further
941 * access to the device is prohibited.
943 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
944 (mode
& FMODE_NDELAY
) != 0);
945 if (!scsi_block_when_processing_errors(sdp
) || !error
)
949 * Send SCSI addressing ioctls directly to mid level, send other
950 * ioctls to block level and then onto mid level if they can't be
954 case SCSI_IOCTL_GET_IDLUN
:
955 case SCSI_IOCTL_GET_BUS_NUMBER
:
956 error
= scsi_ioctl(sdp
, cmd
, p
);
959 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
960 if (error
!= -ENOTTY
)
962 error
= scsi_ioctl(sdp
, cmd
, p
);
969 static void set_media_not_present(struct scsi_disk
*sdkp
)
971 sdkp
->media_present
= 0;
973 sdkp
->device
->changed
= 1;
977 * sd_media_changed - check if our medium changed
978 * @disk: kernel device descriptor
980 * Returns 0 if not applicable or no change; 1 if change
982 * Note: this function is invoked from the block subsystem.
984 static int sd_media_changed(struct gendisk
*disk
)
986 struct scsi_disk
*sdkp
= scsi_disk(disk
);
987 struct scsi_device
*sdp
= sdkp
->device
;
988 struct scsi_sense_hdr
*sshdr
= NULL
;
991 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
997 * If the device is offline, don't send any commands - just pretend as
998 * if the command failed. If the device ever comes back online, we
999 * can deal with it then. It is only because of unrecoverable errors
1000 * that we would ever take a device offline in the first place.
1002 if (!scsi_device_online(sdp
)) {
1003 set_media_not_present(sdkp
);
1009 * Using TEST_UNIT_READY enables differentiation between drive with
1010 * no cartridge loaded - NOT READY, drive with changed cartridge -
1011 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1013 * Drives that auto spin down. eg iomega jaz 1G, will be started
1014 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1015 * sd_revalidate() is called.
1019 if (scsi_block_when_processing_errors(sdp
)) {
1020 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1021 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1026 * Unable to test, unit probably not ready. This usually
1027 * means there is no disc in the drive. Mark as changed,
1028 * and we will figure it out later once the drive is
1031 if (retval
|| (scsi_sense_valid(sshdr
) &&
1032 /* 0x3a is medium not present */
1033 sshdr
->asc
== 0x3a)) {
1034 set_media_not_present(sdkp
);
1040 * For removable scsi disk we have to recognise the presence
1041 * of a disk in the drive. This is kept in the struct scsi_disk
1042 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1044 sdkp
->media_present
= 1;
1046 retval
= sdp
->changed
;
1049 if (retval
!= sdkp
->previous_state
)
1050 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
1051 sdkp
->previous_state
= retval
;
1056 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1059 struct scsi_device
*sdp
= sdkp
->device
;
1060 struct scsi_sense_hdr sshdr
;
1062 if (!scsi_device_online(sdp
))
1066 for (retries
= 3; retries
> 0; --retries
) {
1067 unsigned char cmd
[10] = { 0 };
1069 cmd
[0] = SYNCHRONIZE_CACHE
;
1071 * Leave the rest of the command zero to indicate
1074 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1075 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1081 sd_print_result(sdkp
, res
);
1082 if (driver_byte(res
) & DRIVER_SENSE
)
1083 sd_print_sense_hdr(sdkp
, &sshdr
);
1091 static void sd_rescan(struct device
*dev
)
1093 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1096 revalidate_disk(sdkp
->disk
);
1097 scsi_disk_put(sdkp
);
1102 #ifdef CONFIG_COMPAT
1104 * This gets directly called from VFS. When the ioctl
1105 * is not recognized we go back to the other translation paths.
1107 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1108 unsigned int cmd
, unsigned long arg
)
1110 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1113 * If we are in the middle of error recovery, don't let anyone
1114 * else try and use this device. Also, if error recovery fails, it
1115 * may try and take the device offline, in which case all further
1116 * access to the device is prohibited.
1118 if (!scsi_block_when_processing_errors(sdev
))
1121 if (sdev
->host
->hostt
->compat_ioctl
) {
1124 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1130 * Let the static ioctl translation table take care of it.
1132 return -ENOIOCTLCMD
;
1136 static const struct block_device_operations sd_fops
= {
1137 .owner
= THIS_MODULE
,
1139 .release
= sd_release
,
1141 .getgeo
= sd_getgeo
,
1142 #ifdef CONFIG_COMPAT
1143 .compat_ioctl
= sd_compat_ioctl
,
1145 .media_changed
= sd_media_changed
,
1146 .revalidate_disk
= sd_revalidate_disk
,
1147 .unlock_native_capacity
= sd_unlock_native_capacity
,
1150 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1152 u64 start_lba
= blk_rq_pos(scmd
->request
);
1153 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1157 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1160 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1161 SCSI_SENSE_BUFFERSIZE
,
1166 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1169 if (scmd
->device
->sector_size
< 512) {
1170 /* only legitimate sector_size here is 256 */
1174 /* be careful ... don't want any overflows */
1175 u64 factor
= scmd
->device
->sector_size
/ 512;
1176 do_div(start_lba
, factor
);
1177 do_div(end_lba
, factor
);
1180 /* The bad lba was reported incorrectly, we have no idea where
1183 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1186 /* This computation should always be done in terms of
1187 * the resolution of the device's medium.
1189 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1193 * sd_done - bottom half handler: called when the lower level
1194 * driver has completed (successfully or otherwise) a scsi command.
1195 * @SCpnt: mid-level's per command structure.
1197 * Note: potentially run from within an ISR. Must not block.
1199 static int sd_done(struct scsi_cmnd
*SCpnt
)
1201 int result
= SCpnt
->result
;
1202 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1203 struct scsi_sense_hdr sshdr
;
1204 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1205 int sense_valid
= 0;
1206 int sense_deferred
= 0;
1208 if (SCpnt
->request
->cmd_flags
& REQ_DISCARD
) {
1210 scsi_set_resid(SCpnt
, 0);
1215 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1217 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1219 #ifdef CONFIG_SCSI_LOGGING
1220 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1222 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1223 "sd_done: sb[respc,sk,asc,"
1224 "ascq]=%x,%x,%x,%x\n",
1225 sshdr
.response_code
,
1226 sshdr
.sense_key
, sshdr
.asc
,
1230 if (driver_byte(result
) != DRIVER_SENSE
&&
1231 (!sense_valid
|| sense_deferred
))
1234 switch (sshdr
.sense_key
) {
1235 case HARDWARE_ERROR
:
1237 good_bytes
= sd_completed_bytes(SCpnt
);
1239 case RECOVERED_ERROR
:
1240 good_bytes
= scsi_bufflen(SCpnt
);
1243 /* This indicates a false check condition, so ignore it. An
1244 * unknown amount of data was transferred so treat it as an
1247 scsi_print_sense("sd", SCpnt
);
1249 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1251 case ABORTED_COMMAND
: /* DIF: Target detected corruption */
1252 case ILLEGAL_REQUEST
: /* DIX: Host detected corruption */
1253 if (sshdr
.asc
== 0x10)
1254 good_bytes
= sd_completed_bytes(SCpnt
);
1260 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1261 sd_dif_complete(SCpnt
, good_bytes
);
1263 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1264 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1266 /* We have to print a failed command here as the
1267 * extended CDB gets freed before scsi_io_completion()
1271 scsi_print_command(SCpnt
);
1273 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1281 static int media_not_present(struct scsi_disk
*sdkp
,
1282 struct scsi_sense_hdr
*sshdr
)
1285 if (!scsi_sense_valid(sshdr
))
1287 /* not invoked for commands that could return deferred errors */
1288 if (sshdr
->sense_key
!= NOT_READY
&&
1289 sshdr
->sense_key
!= UNIT_ATTENTION
)
1291 if (sshdr
->asc
!= 0x3A) /* medium not present */
1294 set_media_not_present(sdkp
);
1299 * spinup disk - called only in sd_revalidate_disk()
1302 sd_spinup_disk(struct scsi_disk
*sdkp
)
1304 unsigned char cmd
[10];
1305 unsigned long spintime_expire
= 0;
1306 int retries
, spintime
;
1307 unsigned int the_result
;
1308 struct scsi_sense_hdr sshdr
;
1309 int sense_valid
= 0;
1313 /* Spin up drives, as required. Only do this at boot time */
1314 /* Spinup needs to be done for module loads too. */
1319 cmd
[0] = TEST_UNIT_READY
;
1320 memset((void *) &cmd
[1], 0, 9);
1322 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1325 SD_MAX_RETRIES
, NULL
);
1328 * If the drive has indicated to us that it
1329 * doesn't have any media in it, don't bother
1330 * with any more polling.
1332 if (media_not_present(sdkp
, &sshdr
))
1336 sense_valid
= scsi_sense_valid(&sshdr
);
1338 } while (retries
< 3 &&
1339 (!scsi_status_is_good(the_result
) ||
1340 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1341 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1343 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1344 /* no sense, TUR either succeeded or failed
1345 * with a status error */
1346 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1347 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1348 sd_print_result(sdkp
, the_result
);
1354 * The device does not want the automatic start to be issued.
1356 if (sdkp
->device
->no_start_on_add
)
1359 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1360 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1361 break; /* manual intervention required */
1362 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1363 break; /* standby */
1364 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1365 break; /* unavailable */
1367 * Issue command to spin up drive when not ready
1370 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1371 cmd
[0] = START_STOP
;
1372 cmd
[1] = 1; /* Return immediately */
1373 memset((void *) &cmd
[2], 0, 8);
1374 cmd
[4] = 1; /* Start spin cycle */
1375 if (sdkp
->device
->start_stop_pwr_cond
)
1377 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1379 SD_TIMEOUT
, SD_MAX_RETRIES
,
1381 spintime_expire
= jiffies
+ 100 * HZ
;
1384 /* Wait 1 second for next try */
1389 * Wait for USB flash devices with slow firmware.
1390 * Yes, this sense key/ASC combination shouldn't
1391 * occur here. It's characteristic of these devices.
1393 } else if (sense_valid
&&
1394 sshdr
.sense_key
== UNIT_ATTENTION
&&
1395 sshdr
.asc
== 0x28) {
1397 spintime_expire
= jiffies
+ 5 * HZ
;
1400 /* Wait 1 second for next try */
1403 /* we don't understand the sense code, so it's
1404 * probably pointless to loop */
1406 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1407 sd_print_sense_hdr(sdkp
, &sshdr
);
1412 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1415 if (scsi_status_is_good(the_result
))
1418 printk("not responding...\n");
1424 * Determine whether disk supports Data Integrity Field.
1426 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1428 struct scsi_device
*sdp
= sdkp
->device
;
1431 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1434 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1436 if (type
== sdkp
->protection_type
|| !sdkp
->first_scan
)
1439 sdkp
->protection_type
= type
;
1441 if (type
> SD_DIF_TYPE3_PROTECTION
) {
1442 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported " \
1443 "protection type %u. Disabling disk!\n", type
);
1448 if (scsi_host_dif_capable(sdp
->host
, type
))
1449 sd_printk(KERN_NOTICE
, sdkp
,
1450 "Enabling DIF Type %u protection\n", type
);
1452 sd_printk(KERN_NOTICE
, sdkp
,
1453 "Disabling DIF Type %u protection\n", type
);
1456 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1457 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1460 sd_print_result(sdkp
, the_result
);
1461 if (driver_byte(the_result
) & DRIVER_SENSE
)
1462 sd_print_sense_hdr(sdkp
, sshdr
);
1464 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1467 * Set dirty bit for removable devices if not ready -
1468 * sometimes drives will not report this properly.
1470 if (sdp
->removable
&&
1471 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1475 * We used to set media_present to 0 here to indicate no media
1476 * in the drive, but some drives fail read capacity even with
1477 * media present, so we can't do that.
1479 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1483 #if RC16_LEN > SD_BUF_SIZE
1484 #error RC16_LEN must not be more than SD_BUF_SIZE
1487 #define READ_CAPACITY_RETRIES_ON_RESET 10
1489 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1490 unsigned char *buffer
)
1492 unsigned char cmd
[16];
1493 struct scsi_sense_hdr sshdr
;
1494 int sense_valid
= 0;
1496 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1497 unsigned int alignment
;
1498 unsigned long long lba
;
1499 unsigned sector_size
;
1503 cmd
[0] = SERVICE_ACTION_IN
;
1504 cmd
[1] = SAI_READ_CAPACITY_16
;
1506 memset(buffer
, 0, RC16_LEN
);
1508 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1509 buffer
, RC16_LEN
, &sshdr
,
1510 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1512 if (media_not_present(sdkp
, &sshdr
))
1516 sense_valid
= scsi_sense_valid(&sshdr
);
1518 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1519 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1521 /* Invalid Command Operation Code or
1522 * Invalid Field in CDB, just retry
1523 * silently with RC10 */
1526 sshdr
.sense_key
== UNIT_ATTENTION
&&
1527 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1528 /* Device reset might occur several times,
1529 * give it one more chance */
1530 if (--reset_retries
> 0)
1535 } while (the_result
&& retries
);
1538 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1539 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1543 sector_size
= get_unaligned_be32(&buffer
[8]);
1544 lba
= get_unaligned_be64(&buffer
[0]);
1546 sd_read_protection_type(sdkp
, buffer
);
1548 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1549 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1550 "kernel compiled with support for large block "
1556 /* Logical blocks per physical block exponent */
1557 sdkp
->hw_sector_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1559 /* Lowest aligned logical block */
1560 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1561 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1562 if (alignment
&& sdkp
->first_scan
)
1563 sd_printk(KERN_NOTICE
, sdkp
,
1564 "physical block alignment offset: %u\n", alignment
);
1566 if (buffer
[14] & 0x80) { /* TPE */
1567 struct request_queue
*q
= sdp
->request_queue
;
1569 sdkp
->thin_provisioning
= 1;
1570 q
->limits
.discard_granularity
= sdkp
->hw_sector_size
;
1571 q
->limits
.max_discard_sectors
= 0xffffffff;
1573 if (buffer
[14] & 0x40) /* TPRZ */
1574 q
->limits
.discard_zeroes_data
= 1;
1576 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
1579 sdkp
->capacity
= lba
+ 1;
1583 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1584 unsigned char *buffer
)
1586 unsigned char cmd
[16];
1587 struct scsi_sense_hdr sshdr
;
1588 int sense_valid
= 0;
1590 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1592 unsigned sector_size
;
1595 cmd
[0] = READ_CAPACITY
;
1596 memset(&cmd
[1], 0, 9);
1597 memset(buffer
, 0, 8);
1599 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1601 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1603 if (media_not_present(sdkp
, &sshdr
))
1607 sense_valid
= scsi_sense_valid(&sshdr
);
1609 sshdr
.sense_key
== UNIT_ATTENTION
&&
1610 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1611 /* Device reset might occur several times,
1612 * give it one more chance */
1613 if (--reset_retries
> 0)
1618 } while (the_result
&& retries
);
1621 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1622 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1626 sector_size
= get_unaligned_be32(&buffer
[4]);
1627 lba
= get_unaligned_be32(&buffer
[0]);
1629 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1630 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1631 "kernel compiled with support for large block "
1637 sdkp
->capacity
= lba
+ 1;
1638 sdkp
->hw_sector_size
= sector_size
;
1642 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1644 if (sdp
->host
->max_cmd_len
< 16)
1646 if (sdp
->scsi_level
> SCSI_SPC_2
)
1648 if (scsi_device_protection(sdp
))
1654 * read disk capacity
1657 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1660 struct scsi_device
*sdp
= sdkp
->device
;
1661 sector_t old_capacity
= sdkp
->capacity
;
1663 if (sd_try_rc16_first(sdp
)) {
1664 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1665 if (sector_size
== -EOVERFLOW
)
1667 if (sector_size
== -ENODEV
)
1669 if (sector_size
< 0)
1670 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1671 if (sector_size
< 0)
1674 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1675 if (sector_size
== -EOVERFLOW
)
1677 if (sector_size
< 0)
1679 if ((sizeof(sdkp
->capacity
) > 4) &&
1680 (sdkp
->capacity
> 0xffffffffULL
)) {
1681 int old_sector_size
= sector_size
;
1682 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1683 "Trying to use READ CAPACITY(16).\n");
1684 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1685 if (sector_size
< 0) {
1686 sd_printk(KERN_NOTICE
, sdkp
,
1687 "Using 0xffffffff as device size\n");
1688 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1689 sector_size
= old_sector_size
;
1695 /* Some devices are known to return the total number of blocks,
1696 * not the highest block number. Some devices have versions
1697 * which do this and others which do not. Some devices we might
1698 * suspect of doing this but we don't know for certain.
1700 * If we know the reported capacity is wrong, decrement it. If
1701 * we can only guess, then assume the number of blocks is even
1702 * (usually true but not always) and err on the side of lowering
1705 if (sdp
->fix_capacity
||
1706 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1707 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1708 "from its reported value: %llu\n",
1709 (unsigned long long) sdkp
->capacity
);
1714 if (sector_size
== 0) {
1716 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1720 if (sector_size
!= 512 &&
1721 sector_size
!= 1024 &&
1722 sector_size
!= 2048 &&
1723 sector_size
!= 4096 &&
1724 sector_size
!= 256) {
1725 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1728 * The user might want to re-format the drive with
1729 * a supported sectorsize. Once this happens, it
1730 * would be relatively trivial to set the thing up.
1731 * For this reason, we leave the thing in the table.
1735 * set a bogus sector size so the normal read/write
1736 * logic in the block layer will eventually refuse any
1737 * request on this device without tripping over power
1738 * of two sector size assumptions
1742 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
1745 char cap_str_2
[10], cap_str_10
[10];
1746 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1748 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1750 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1751 sizeof(cap_str_10
));
1753 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
1754 sd_printk(KERN_NOTICE
, sdkp
,
1755 "%llu %d-byte logical blocks: (%s/%s)\n",
1756 (unsigned long long)sdkp
->capacity
,
1757 sector_size
, cap_str_10
, cap_str_2
);
1759 if (sdkp
->hw_sector_size
!= sector_size
)
1760 sd_printk(KERN_NOTICE
, sdkp
,
1761 "%u-byte physical blocks\n",
1762 sdkp
->hw_sector_size
);
1766 /* Rescale capacity to 512-byte units */
1767 if (sector_size
== 4096)
1768 sdkp
->capacity
<<= 3;
1769 else if (sector_size
== 2048)
1770 sdkp
->capacity
<<= 2;
1771 else if (sector_size
== 1024)
1772 sdkp
->capacity
<<= 1;
1773 else if (sector_size
== 256)
1774 sdkp
->capacity
>>= 1;
1776 blk_queue_physical_block_size(sdp
->request_queue
, sdkp
->hw_sector_size
);
1777 sdkp
->device
->sector_size
= sector_size
;
1780 /* called with buffer of length 512 */
1782 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1783 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1784 struct scsi_sense_hdr
*sshdr
)
1786 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1787 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1792 * read write protect setting, if possible - called only in sd_revalidate_disk()
1793 * called with buffer of length SD_BUF_SIZE
1796 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1799 struct scsi_device
*sdp
= sdkp
->device
;
1800 struct scsi_mode_data data
;
1801 int old_wp
= sdkp
->write_prot
;
1803 set_disk_ro(sdkp
->disk
, 0);
1804 if (sdp
->skip_ms_page_3f
) {
1805 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1809 if (sdp
->use_192_bytes_for_3f
) {
1810 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1813 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1814 * We have to start carefully: some devices hang if we ask
1815 * for more than is available.
1817 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1820 * Second attempt: ask for page 0 When only page 0 is
1821 * implemented, a request for page 3F may return Sense Key
1822 * 5: Illegal Request, Sense Code 24: Invalid field in
1825 if (!scsi_status_is_good(res
))
1826 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1829 * Third attempt: ask 255 bytes, as we did earlier.
1831 if (!scsi_status_is_good(res
))
1832 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1836 if (!scsi_status_is_good(res
)) {
1837 sd_printk(KERN_WARNING
, sdkp
,
1838 "Test WP failed, assume Write Enabled\n");
1840 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1841 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1842 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
1843 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1844 sdkp
->write_prot
? "on" : "off");
1845 sd_printk(KERN_DEBUG
, sdkp
,
1846 "Mode Sense: %02x %02x %02x %02x\n",
1847 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1853 * sd_read_cache_type - called only from sd_revalidate_disk()
1854 * called with buffer of length SD_BUF_SIZE
1857 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1860 struct scsi_device
*sdp
= sdkp
->device
;
1864 struct scsi_mode_data data
;
1865 struct scsi_sense_hdr sshdr
;
1866 int old_wce
= sdkp
->WCE
;
1867 int old_rcd
= sdkp
->RCD
;
1868 int old_dpofua
= sdkp
->DPOFUA
;
1870 if (sdp
->skip_ms_page_8
)
1873 if (sdp
->type
== TYPE_RBC
) {
1881 /* cautiously ask */
1882 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1884 if (!scsi_status_is_good(res
))
1887 if (!data
.header_length
) {
1889 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1892 /* that went OK, now ask for the proper length */
1896 * We're only interested in the first three bytes, actually.
1897 * But the data cache page is defined for the first 20.
1904 /* Take headers and block descriptors into account */
1905 len
+= data
.header_length
+ data
.block_descriptor_length
;
1906 if (len
> SD_BUF_SIZE
)
1910 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1912 if (scsi_status_is_good(res
)) {
1913 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1915 if (offset
>= SD_BUF_SIZE
- 2) {
1916 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1920 if ((buffer
[offset
] & 0x3f) != modepage
) {
1921 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1925 if (modepage
== 8) {
1926 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1927 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1929 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1933 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1934 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1935 sd_printk(KERN_NOTICE
, sdkp
,
1936 "Uses READ/WRITE(6), disabling FUA\n");
1940 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
1941 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
1942 sd_printk(KERN_NOTICE
, sdkp
,
1943 "Write cache: %s, read cache: %s, %s\n",
1944 sdkp
->WCE
? "enabled" : "disabled",
1945 sdkp
->RCD
? "disabled" : "enabled",
1946 sdkp
->DPOFUA
? "supports DPO and FUA"
1947 : "doesn't support DPO or FUA");
1953 if (scsi_sense_valid(&sshdr
) &&
1954 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1955 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1956 /* Invalid field in CDB */
1957 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1959 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1962 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1969 * The ATO bit indicates whether the DIF application tag is available
1970 * for use by the operating system.
1972 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1975 struct scsi_device
*sdp
= sdkp
->device
;
1976 struct scsi_mode_data data
;
1977 struct scsi_sense_hdr sshdr
;
1979 if (sdp
->type
!= TYPE_DISK
)
1982 if (sdkp
->protection_type
== 0)
1985 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1986 SD_MAX_RETRIES
, &data
, &sshdr
);
1988 if (!scsi_status_is_good(res
) || !data
.header_length
||
1990 sd_printk(KERN_WARNING
, sdkp
,
1991 "getting Control mode page failed, assume no ATO\n");
1993 if (scsi_sense_valid(&sshdr
))
1994 sd_print_sense_hdr(sdkp
, &sshdr
);
1999 offset
= data
.header_length
+ data
.block_descriptor_length
;
2001 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2002 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2006 if ((buffer
[offset
+ 5] & 0x80) == 0)
2015 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2016 * @disk: disk to query
2018 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2020 struct request_queue
*q
= sdkp
->disk
->queue
;
2021 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2022 const int vpd_len
= 64;
2023 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2026 /* Block Limits VPD */
2027 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2030 blk_queue_io_min(sdkp
->disk
->queue
,
2031 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2032 blk_queue_io_opt(sdkp
->disk
->queue
,
2033 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2035 /* Thin provisioning enabled and page length indicates TP support */
2036 if (sdkp
->thin_provisioning
&& buffer
[3] == 0x3c) {
2037 unsigned int lba_count
, desc_count
, granularity
;
2039 lba_count
= get_unaligned_be32(&buffer
[20]);
2040 desc_count
= get_unaligned_be32(&buffer
[24]);
2043 q
->limits
.max_discard_sectors
=
2044 lba_count
* sector_sz
>> 9;
2050 granularity
= get_unaligned_be32(&buffer
[28]);
2053 q
->limits
.discard_granularity
= granularity
* sector_sz
;
2055 if (buffer
[32] & 0x80)
2056 q
->limits
.discard_alignment
=
2057 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2065 * sd_read_block_characteristics - Query block dev. characteristics
2066 * @disk: disk to query
2068 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2070 unsigned char *buffer
;
2072 const int vpd_len
= 64;
2074 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2077 /* Block Device Characteristics VPD */
2078 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2081 rot
= get_unaligned_be16(&buffer
[4]);
2084 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2090 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2093 * Although VPD inquiries can go to SCSI-2 type devices,
2094 * some USB ones crash on receiving them, and the pages
2095 * we currently ask for are for SPC-3 and beyond
2097 if (sdp
->scsi_level
> SCSI_SPC_2
)
2103 * sd_revalidate_disk - called the first time a new disk is seen,
2104 * performs disk spin up, read_capacity, etc.
2105 * @disk: struct gendisk we care about
2107 static int sd_revalidate_disk(struct gendisk
*disk
)
2109 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2110 struct scsi_device
*sdp
= sdkp
->device
;
2111 unsigned char *buffer
;
2114 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2115 "sd_revalidate_disk\n"));
2118 * If the device is offline, don't try and read capacity or any
2119 * of the other niceties.
2121 if (!scsi_device_online(sdp
))
2124 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2126 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2127 "allocation failure.\n");
2131 sd_spinup_disk(sdkp
);
2134 * Without media there is no reason to ask; moreover, some devices
2135 * react badly if we do.
2137 if (sdkp
->media_present
) {
2138 sd_read_capacity(sdkp
, buffer
);
2140 if (sd_try_extended_inquiry(sdp
)) {
2141 sd_read_block_limits(sdkp
);
2142 sd_read_block_characteristics(sdkp
);
2145 sd_read_write_protect_flag(sdkp
, buffer
);
2146 sd_read_cache_type(sdkp
, buffer
);
2147 sd_read_app_tag_own(sdkp
, buffer
);
2150 sdkp
->first_scan
= 0;
2153 * We now have all cache related info, determine how we deal
2154 * with ordered requests. Note that as the current SCSI
2155 * dispatch function can alter request order, we cannot use
2156 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2159 ordered
= sdkp
->DPOFUA
2160 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
2162 ordered
= QUEUE_ORDERED_DRAIN
;
2164 blk_queue_ordered(sdkp
->disk
->queue
, ordered
);
2166 set_capacity(disk
, sdkp
->capacity
);
2174 * sd_unlock_native_capacity - unlock native capacity
2175 * @disk: struct gendisk to set capacity for
2177 * Block layer calls this function if it detects that partitions
2178 * on @disk reach beyond the end of the device. If the SCSI host
2179 * implements ->unlock_native_capacity() method, it's invoked to
2180 * give it a chance to adjust the device capacity.
2183 * Defined by block layer. Might sleep.
2185 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2187 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2189 if (sdev
->host
->hostt
->unlock_native_capacity
)
2190 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2194 * sd_format_disk_name - format disk name
2195 * @prefix: name prefix - ie. "sd" for SCSI disks
2196 * @index: index of the disk to format name for
2197 * @buf: output buffer
2198 * @buflen: length of the output buffer
2200 * SCSI disk names starts at sda. The 26th device is sdz and the
2201 * 27th is sdaa. The last one for two lettered suffix is sdzz
2202 * which is followed by sdaaa.
2204 * This is basically 26 base counting with one extra 'nil' entry
2205 * at the beginning from the second digit on and can be
2206 * determined using similar method as 26 base conversion with the
2207 * index shifted -1 after each digit is computed.
2213 * 0 on success, -errno on failure.
2215 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2217 const int base
= 'z' - 'a' + 1;
2218 char *begin
= buf
+ strlen(prefix
);
2219 char *end
= buf
+ buflen
;
2229 *--p
= 'a' + (index
% unit
);
2230 index
= (index
/ unit
) - 1;
2231 } while (index
>= 0);
2233 memmove(begin
, p
, end
- p
);
2234 memcpy(buf
, prefix
, strlen(prefix
));
2240 * The asynchronous part of sd_probe
2242 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2244 struct scsi_disk
*sdkp
= data
;
2245 struct scsi_device
*sdp
;
2252 index
= sdkp
->index
;
2253 dev
= &sdp
->sdev_gendev
;
2255 if (index
< SD_MAX_DISKS
) {
2256 gd
->major
= sd_major((index
& 0xf0) >> 4);
2257 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2258 gd
->minors
= SD_MINORS
;
2260 gd
->fops
= &sd_fops
;
2261 gd
->private_data
= &sdkp
->driver
;
2262 gd
->queue
= sdkp
->device
->request_queue
;
2264 /* defaults, until the device tells us otherwise */
2265 sdp
->sector_size
= 512;
2267 sdkp
->media_present
= 1;
2268 sdkp
->write_prot
= 0;
2272 sdkp
->first_scan
= 1;
2274 sd_revalidate_disk(gd
);
2276 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2277 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2279 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2280 gd
->flags
= GENHD_FL_EXT_DEVT
;
2282 gd
->flags
|= GENHD_FL_REMOVABLE
;
2285 sd_dif_config_host(sdkp
);
2287 sd_revalidate_disk(gd
);
2289 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2290 sdp
->removable
? "removable " : "");
2291 scsi_autopm_put_device(sdp
);
2292 put_device(&sdkp
->dev
);
2296 * sd_probe - called during driver initialization and whenever a
2297 * new scsi device is attached to the system. It is called once
2298 * for each scsi device (not just disks) present.
2299 * @dev: pointer to device object
2301 * Returns 0 if successful (or not interested in this scsi device
2302 * (e.g. scanner)); 1 when there is an error.
2304 * Note: this function is invoked from the scsi mid-level.
2305 * This function sets up the mapping between a given
2306 * <host,channel,id,lun> (found in sdp) and new device name
2307 * (e.g. /dev/sda). More precisely it is the block device major
2308 * and minor number that is chosen here.
2310 * Assume sd_attach is not re-entrant (for time being)
2311 * Also think about sd_attach() and sd_remove() running coincidentally.
2313 static int sd_probe(struct device
*dev
)
2315 struct scsi_device
*sdp
= to_scsi_device(dev
);
2316 struct scsi_disk
*sdkp
;
2322 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2325 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2329 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2333 gd
= alloc_disk(SD_MINORS
);
2338 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2341 spin_lock(&sd_index_lock
);
2342 error
= ida_get_new(&sd_index_ida
, &index
);
2343 spin_unlock(&sd_index_lock
);
2344 } while (error
== -EAGAIN
);
2349 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2351 goto out_free_index
;
2354 sdkp
->driver
= &sd_template
;
2356 sdkp
->index
= index
;
2357 atomic_set(&sdkp
->openers
, 0);
2358 sdkp
->previous_state
= 1;
2360 if (!sdp
->request_queue
->rq_timeout
) {
2361 if (sdp
->type
!= TYPE_MOD
)
2362 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2364 blk_queue_rq_timeout(sdp
->request_queue
,
2368 device_initialize(&sdkp
->dev
);
2369 sdkp
->dev
.parent
= dev
;
2370 sdkp
->dev
.class = &sd_disk_class
;
2371 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2373 if (device_add(&sdkp
->dev
))
2374 goto out_free_index
;
2377 dev_set_drvdata(dev
, sdkp
);
2379 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2380 async_schedule(sd_probe_async
, sdkp
);
2385 spin_lock(&sd_index_lock
);
2386 ida_remove(&sd_index_ida
, index
);
2387 spin_unlock(&sd_index_lock
);
2397 * sd_remove - called whenever a scsi disk (previously recognized by
2398 * sd_probe) is detached from the system. It is called (potentially
2399 * multiple times) during sd module unload.
2400 * @sdp: pointer to mid level scsi device object
2402 * Note: this function is invoked from the scsi mid-level.
2403 * This function potentially frees up a device name (e.g. /dev/sdc)
2404 * that could be re-used by a subsequent sd_probe().
2405 * This function is not called when the built-in sd driver is "exit-ed".
2407 static int sd_remove(struct device
*dev
)
2409 struct scsi_disk
*sdkp
;
2411 sdkp
= dev_get_drvdata(dev
);
2412 scsi_autopm_get_device(sdkp
->device
);
2414 async_synchronize_full();
2415 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2416 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2417 device_del(&sdkp
->dev
);
2418 del_gendisk(sdkp
->disk
);
2421 mutex_lock(&sd_ref_mutex
);
2422 dev_set_drvdata(dev
, NULL
);
2423 put_device(&sdkp
->dev
);
2424 mutex_unlock(&sd_ref_mutex
);
2430 * scsi_disk_release - Called to free the scsi_disk structure
2431 * @dev: pointer to embedded class device
2433 * sd_ref_mutex must be held entering this routine. Because it is
2434 * called on last put, you should always use the scsi_disk_get()
2435 * scsi_disk_put() helpers which manipulate the semaphore directly
2436 * and never do a direct put_device.
2438 static void scsi_disk_release(struct device
*dev
)
2440 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2441 struct gendisk
*disk
= sdkp
->disk
;
2443 spin_lock(&sd_index_lock
);
2444 ida_remove(&sd_index_ida
, sdkp
->index
);
2445 spin_unlock(&sd_index_lock
);
2447 disk
->private_data
= NULL
;
2449 put_device(&sdkp
->device
->sdev_gendev
);
2454 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2456 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2457 struct scsi_sense_hdr sshdr
;
2458 struct scsi_device
*sdp
= sdkp
->device
;
2462 cmd
[4] |= 1; /* START */
2464 if (sdp
->start_stop_pwr_cond
)
2465 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2467 if (!scsi_device_online(sdp
))
2470 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2471 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2473 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2474 sd_print_result(sdkp
, res
);
2475 if (driver_byte(res
) & DRIVER_SENSE
)
2476 sd_print_sense_hdr(sdkp
, &sshdr
);
2483 * Send a SYNCHRONIZE CACHE instruction down to the device through
2484 * the normal SCSI command structure. Wait for the command to
2487 static void sd_shutdown(struct device
*dev
)
2489 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2492 return; /* this can happen */
2495 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2496 sd_sync_cache(sdkp
);
2499 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2500 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2501 sd_start_stop_device(sdkp
, 0);
2504 scsi_disk_put(sdkp
);
2507 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2509 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2513 return 0; /* this can happen */
2516 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2517 ret
= sd_sync_cache(sdkp
);
2522 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2523 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2524 ret
= sd_start_stop_device(sdkp
, 0);
2528 scsi_disk_put(sdkp
);
2532 static int sd_resume(struct device
*dev
)
2534 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2537 if (!sdkp
->device
->manage_start_stop
)
2540 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2541 ret
= sd_start_stop_device(sdkp
, 1);
2544 scsi_disk_put(sdkp
);
2549 * init_sd - entry point for this driver (both when built in or when
2552 * Note: this function registers this driver with the scsi mid-level.
2554 static int __init
init_sd(void)
2556 int majors
= 0, i
, err
;
2558 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2560 for (i
= 0; i
< SD_MAJORS
; i
++)
2561 if (register_blkdev(sd_major(i
), "sd") == 0)
2567 err
= class_register(&sd_disk_class
);
2571 err
= scsi_register_driver(&sd_template
.gendrv
);
2575 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2577 if (!sd_cdb_cache
) {
2578 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2582 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2584 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2591 kmem_cache_destroy(sd_cdb_cache
);
2594 class_unregister(&sd_disk_class
);
2596 for (i
= 0; i
< SD_MAJORS
; i
++)
2597 unregister_blkdev(sd_major(i
), "sd");
2602 * exit_sd - exit point for this driver (when it is a module).
2604 * Note: this function unregisters this driver from the scsi mid-level.
2606 static void __exit
exit_sd(void)
2610 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2612 mempool_destroy(sd_cdb_pool
);
2613 kmem_cache_destroy(sd_cdb_cache
);
2615 scsi_unregister_driver(&sd_template
.gendrv
);
2616 class_unregister(&sd_disk_class
);
2618 for (i
= 0; i
< SD_MAJORS
; i
++)
2619 unregister_blkdev(sd_major(i
), "sd");
2622 module_init(init_sd
);
2623 module_exit(exit_sd
);
2625 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2626 struct scsi_sense_hdr
*sshdr
)
2628 sd_printk(KERN_INFO
, sdkp
, "");
2629 scsi_show_sense_hdr(sshdr
);
2630 sd_printk(KERN_INFO
, sdkp
, "");
2631 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2634 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2636 sd_printk(KERN_INFO
, sdkp
, "");
2637 scsi_show_result(result
);