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 struct kmem_cache
*sd_cdb_cache
;
122 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 const int 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_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
264 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
266 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
270 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
273 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
275 return snprintf(buf
, 20, "%u\n", sdkp
->thin_provisioning
);
278 static struct device_attribute sd_disk_attrs
[] = {
279 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
280 sd_store_cache_type
),
281 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
282 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
283 sd_store_allow_restart
),
284 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
285 sd_store_manage_start_stop
),
286 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
287 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
288 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
292 static struct class sd_disk_class
= {
294 .owner
= THIS_MODULE
,
295 .dev_release
= scsi_disk_release
,
296 .dev_attrs
= sd_disk_attrs
,
299 static struct scsi_driver sd_template
= {
300 .owner
= THIS_MODULE
,
305 .suspend
= sd_suspend
,
307 .shutdown
= sd_shutdown
,
314 * Device no to disk mapping:
316 * major disc2 disc p1
317 * |............|.............|....|....| <- dev_t
320 * Inside a major, we have 16k disks, however mapped non-
321 * contiguously. The first 16 disks are for major0, the next
322 * ones with major1, ... Disk 256 is for major0 again, disk 272
324 * As we stay compatible with our numbering scheme, we can reuse
325 * the well-know SCSI majors 8, 65--71, 136--143.
327 static int sd_major(int major_idx
)
331 return SCSI_DISK0_MAJOR
;
333 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
335 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
338 return 0; /* shut up gcc */
342 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
344 struct scsi_disk
*sdkp
= NULL
;
346 if (disk
->private_data
) {
347 sdkp
= scsi_disk(disk
);
348 if (scsi_device_get(sdkp
->device
) == 0)
349 get_device(&sdkp
->dev
);
356 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
358 struct scsi_disk
*sdkp
;
360 mutex_lock(&sd_ref_mutex
);
361 sdkp
= __scsi_disk_get(disk
);
362 mutex_unlock(&sd_ref_mutex
);
366 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
368 struct scsi_disk
*sdkp
;
370 mutex_lock(&sd_ref_mutex
);
371 sdkp
= dev_get_drvdata(dev
);
373 sdkp
= __scsi_disk_get(sdkp
->disk
);
374 mutex_unlock(&sd_ref_mutex
);
378 static void scsi_disk_put(struct scsi_disk
*sdkp
)
380 struct scsi_device
*sdev
= sdkp
->device
;
382 mutex_lock(&sd_ref_mutex
);
383 put_device(&sdkp
->dev
);
384 scsi_device_put(sdev
);
385 mutex_unlock(&sd_ref_mutex
);
388 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
390 unsigned int prot_op
= SCSI_PROT_NORMAL
;
391 unsigned int dix
= scsi_prot_sg_count(scmd
);
393 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
395 prot_op
= SCSI_PROT_READ_PASS
;
396 else if (dif
&& !dix
)
397 prot_op
= SCSI_PROT_READ_STRIP
;
398 else if (!dif
&& dix
)
399 prot_op
= SCSI_PROT_READ_INSERT
;
402 prot_op
= SCSI_PROT_WRITE_PASS
;
403 else if (dif
&& !dix
)
404 prot_op
= SCSI_PROT_WRITE_INSERT
;
405 else if (!dif
&& dix
)
406 prot_op
= SCSI_PROT_WRITE_STRIP
;
409 scsi_set_prot_op(scmd
, prot_op
);
410 scsi_set_prot_type(scmd
, dif
);
414 * sd_prepare_discard - unmap blocks on thinly provisioned device
415 * @rq: Request to prepare
417 * Will issue either UNMAP or WRITE SAME(16) depending on preference
418 * indicated by target device.
420 static int sd_prepare_discard(struct request
*rq
)
422 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
423 struct bio
*bio
= rq
->bio
;
424 sector_t sector
= bio
->bi_sector
;
425 unsigned int num
= bio_sectors(bio
);
427 if (sdkp
->device
->sector_size
== 4096) {
432 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
433 rq
->timeout
= SD_TIMEOUT
;
435 memset(rq
->cmd
, 0, rq
->cmd_len
);
438 char *buf
= kmap_atomic(bio_page(bio
), KM_USER0
);
444 /* Ensure that data length matches payload */
445 rq
->__data_len
= bio
->bi_size
= bio
->bi_io_vec
->bv_len
= 24;
447 put_unaligned_be16(6 + 16, &buf
[0]);
448 put_unaligned_be16(16, &buf
[2]);
449 put_unaligned_be64(sector
, &buf
[8]);
450 put_unaligned_be32(num
, &buf
[16]);
452 kunmap_atomic(buf
, KM_USER0
);
454 rq
->cmd
[0] = WRITE_SAME_16
;
455 rq
->cmd
[1] = 0x8; /* UNMAP */
456 put_unaligned_be64(sector
, &rq
->cmd
[2]);
457 put_unaligned_be32(num
, &rq
->cmd
[10]);
465 * sd_init_command - build a scsi (read or write) command from
466 * information in the request structure.
467 * @SCpnt: pointer to mid-level's per scsi command structure that
468 * contains request and into which the scsi command is written
470 * Returns 1 if successful and 0 if error (or cannot be done now).
472 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
474 struct scsi_cmnd
*SCpnt
;
475 struct scsi_device
*sdp
= q
->queuedata
;
476 struct gendisk
*disk
= rq
->rq_disk
;
477 struct scsi_disk
*sdkp
;
478 sector_t block
= blk_rq_pos(rq
);
480 unsigned int this_count
= blk_rq_sectors(rq
);
482 unsigned char protect
;
485 * Discard request come in as REQ_TYPE_FS but we turn them into
486 * block PC requests to make life easier.
488 if (blk_discard_rq(rq
))
489 ret
= sd_prepare_discard(rq
);
491 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
492 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
494 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
498 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
499 if (ret
!= BLKPREP_OK
)
502 sdkp
= scsi_disk(disk
);
504 /* from here on until we're complete, any goto out
505 * is used for a killable error condition */
508 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
509 "sd_init_command: block=%llu, "
511 (unsigned long long)block
,
514 if (!sdp
|| !scsi_device_online(sdp
) ||
515 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
516 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
517 "Finishing %u sectors\n",
518 blk_rq_sectors(rq
)));
519 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
520 "Retry with 0x%p\n", SCpnt
));
526 * quietly refuse to do anything to a changed disc until
527 * the changed bit has been reset
529 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
534 * Some SD card readers can't handle multi-sector accesses which touch
535 * the last one or two hardware sectors. Split accesses as needed.
537 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
538 (sdp
->sector_size
/ 512);
540 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
541 if (block
< threshold
) {
542 /* Access up to the threshold but not beyond */
543 this_count
= threshold
- block
;
545 /* Access only a single hardware sector */
546 this_count
= sdp
->sector_size
/ 512;
550 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
551 (unsigned long long)block
));
554 * If we have a 1K hardware sectorsize, prevent access to single
555 * 512 byte sectors. In theory we could handle this - in fact
556 * the scsi cdrom driver must be able to handle this because
557 * we typically use 1K blocksizes, and cdroms typically have
558 * 2K hardware sectorsizes. Of course, things are simpler
559 * with the cdrom, since it is read-only. For performance
560 * reasons, the filesystems should be able to handle this
561 * and not force the scsi disk driver to use bounce buffers
564 if (sdp
->sector_size
== 1024) {
565 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
566 scmd_printk(KERN_ERR
, SCpnt
,
567 "Bad block number requested\n");
571 this_count
= this_count
>> 1;
574 if (sdp
->sector_size
== 2048) {
575 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
576 scmd_printk(KERN_ERR
, SCpnt
,
577 "Bad block number requested\n");
581 this_count
= this_count
>> 2;
584 if (sdp
->sector_size
== 4096) {
585 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
586 scmd_printk(KERN_ERR
, SCpnt
,
587 "Bad block number requested\n");
591 this_count
= this_count
>> 3;
594 if (rq_data_dir(rq
) == WRITE
) {
595 if (!sdp
->writeable
) {
598 SCpnt
->cmnd
[0] = WRITE_6
;
599 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
601 if (blk_integrity_rq(rq
) &&
602 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
605 } else if (rq_data_dir(rq
) == READ
) {
606 SCpnt
->cmnd
[0] = READ_6
;
607 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
609 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
613 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
614 "%s %d/%u 512 byte blocks.\n",
615 (rq_data_dir(rq
) == WRITE
) ?
616 "writing" : "reading", this_count
,
617 blk_rq_sectors(rq
)));
619 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
620 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
626 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
627 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
629 if (unlikely(SCpnt
->cmnd
== NULL
)) {
634 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
635 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
636 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
637 SCpnt
->cmnd
[7] = 0x18;
638 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
639 SCpnt
->cmnd
[10] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
642 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
643 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
644 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
645 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
646 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
647 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
648 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
649 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
651 /* Expected Indirect LBA */
652 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
653 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
654 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
655 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
657 /* Transfer length */
658 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
659 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
660 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
661 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
662 } else if (block
> 0xffffffff) {
663 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
664 SCpnt
->cmnd
[1] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
665 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
666 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
667 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
668 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
669 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
670 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
671 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
672 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
673 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
674 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
675 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
676 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
677 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
678 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
679 scsi_device_protection(SCpnt
->device
) ||
680 SCpnt
->device
->use_10_for_rw
) {
681 if (this_count
> 0xffff)
684 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
685 SCpnt
->cmnd
[1] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
686 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
687 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
688 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
689 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
690 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
691 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
692 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
694 if (unlikely(blk_fua_rq(rq
))) {
696 * This happens only if this drive failed
697 * 10byte rw command with ILLEGAL_REQUEST
698 * during operation and thus turned off
701 scmd_printk(KERN_ERR
, SCpnt
,
702 "FUA write on READ/WRITE(6) drive\n");
706 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
707 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
708 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
709 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
712 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
714 /* If DIF or DIX is enabled, tell HBA how to handle request */
715 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
716 sd_prot_op(SCpnt
, host_dif
);
719 * We shouldn't disconnect in the middle of a sector, so with a dumb
720 * host adapter, it's safe to assume that we can at least transfer
721 * this many bytes between each connect / disconnect.
723 SCpnt
->transfersize
= sdp
->sector_size
;
724 SCpnt
->underflow
= this_count
<< 9;
725 SCpnt
->allowed
= SD_MAX_RETRIES
;
728 * This indicates that the command is ready from our end to be
733 return scsi_prep_return(q
, rq
, ret
);
737 * sd_open - open a scsi disk device
738 * @inode: only i_rdev member may be used
739 * @filp: only f_mode and f_flags may be used
741 * Returns 0 if successful. Returns a negated errno value in case
744 * Note: This can be called from a user context (e.g. fsck(1) )
745 * or from within the kernel (e.g. as a result of a mount(1) ).
746 * In the latter case @inode and @filp carry an abridged amount
747 * of information as noted above.
749 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
751 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
752 struct scsi_device
*sdev
;
758 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
762 retval
= scsi_autopm_get_device(sdev
);
767 * If the device is in error recovery, wait until it is done.
768 * If the device is offline, then disallow any access to it.
771 if (!scsi_block_when_processing_errors(sdev
))
774 if (sdev
->removable
|| sdkp
->write_prot
)
775 check_disk_change(bdev
);
778 * If the drive is empty, just let the open fail.
781 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
785 * If the device has the write protect tab set, have the open fail
786 * if the user expects to be able to write to the thing.
789 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
793 * It is possible that the disk changing stuff resulted in
794 * the device being taken offline. If this is the case,
795 * report this to the user, and don't pretend that the
796 * open actually succeeded.
799 if (!scsi_device_online(sdev
))
802 if (!sdkp
->openers
++ && sdev
->removable
) {
803 if (scsi_block_when_processing_errors(sdev
))
804 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
810 scsi_autopm_put_device(sdev
);
817 * sd_release - invoked when the (last) close(2) is called on this
819 * @inode: only i_rdev member may be used
820 * @filp: only f_mode and f_flags may be used
824 * Note: may block (uninterruptible) if error recovery is underway
827 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
829 struct scsi_disk
*sdkp
= scsi_disk(disk
);
830 struct scsi_device
*sdev
= sdkp
->device
;
832 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
834 if (!--sdkp
->openers
&& sdev
->removable
) {
835 if (scsi_block_when_processing_errors(sdev
))
836 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
840 * XXX and what if there are packets in flight and this close()
841 * XXX is followed by a "rmmod sd_mod"?
844 scsi_autopm_put_device(sdev
);
849 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
851 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
852 struct scsi_device
*sdp
= sdkp
->device
;
853 struct Scsi_Host
*host
= sdp
->host
;
856 /* default to most commonly used values */
857 diskinfo
[0] = 0x40; /* 1 << 6 */
858 diskinfo
[1] = 0x20; /* 1 << 5 */
859 diskinfo
[2] = sdkp
->capacity
>> 11;
861 /* override with calculated, extended default, or driver values */
862 if (host
->hostt
->bios_param
)
863 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
865 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
867 geo
->heads
= diskinfo
[0];
868 geo
->sectors
= diskinfo
[1];
869 geo
->cylinders
= diskinfo
[2];
874 * sd_ioctl - process an ioctl
875 * @inode: only i_rdev/i_bdev members may be used
876 * @filp: only f_mode and f_flags may be used
877 * @cmd: ioctl command number
878 * @arg: this is third argument given to ioctl(2) system call.
879 * Often contains a pointer.
881 * Returns 0 if successful (some ioctls return postive numbers on
882 * success as well). Returns a negated errno value in case of error.
884 * Note: most ioctls are forward onto the block subsystem or further
885 * down in the scsi subsystem.
887 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
888 unsigned int cmd
, unsigned long arg
)
890 struct gendisk
*disk
= bdev
->bd_disk
;
891 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
892 void __user
*p
= (void __user
*)arg
;
895 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
896 disk
->disk_name
, cmd
));
899 * If we are in the middle of error recovery, don't let anyone
900 * else try and use this device. Also, if error recovery fails, it
901 * may try and take the device offline, in which case all further
902 * access to the device is prohibited.
904 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
905 (mode
& FMODE_NDELAY
) != 0);
906 if (!scsi_block_when_processing_errors(sdp
) || !error
)
910 * Send SCSI addressing ioctls directly to mid level, send other
911 * ioctls to block level and then onto mid level if they can't be
915 case SCSI_IOCTL_GET_IDLUN
:
916 case SCSI_IOCTL_GET_BUS_NUMBER
:
917 return scsi_ioctl(sdp
, cmd
, p
);
919 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
920 if (error
!= -ENOTTY
)
923 return scsi_ioctl(sdp
, cmd
, p
);
926 static void set_media_not_present(struct scsi_disk
*sdkp
)
928 sdkp
->media_present
= 0;
930 sdkp
->device
->changed
= 1;
934 * sd_media_changed - check if our medium changed
935 * @disk: kernel device descriptor
937 * Returns 0 if not applicable or no change; 1 if change
939 * Note: this function is invoked from the block subsystem.
941 static int sd_media_changed(struct gendisk
*disk
)
943 struct scsi_disk
*sdkp
= scsi_disk(disk
);
944 struct scsi_device
*sdp
= sdkp
->device
;
945 struct scsi_sense_hdr
*sshdr
= NULL
;
948 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
954 * If the device is offline, don't send any commands - just pretend as
955 * if the command failed. If the device ever comes back online, we
956 * can deal with it then. It is only because of unrecoverable errors
957 * that we would ever take a device offline in the first place.
959 if (!scsi_device_online(sdp
)) {
960 set_media_not_present(sdkp
);
966 * Using TEST_UNIT_READY enables differentiation between drive with
967 * no cartridge loaded - NOT READY, drive with changed cartridge -
968 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
970 * Drives that auto spin down. eg iomega jaz 1G, will be started
971 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
972 * sd_revalidate() is called.
976 if (scsi_block_when_processing_errors(sdp
)) {
977 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
978 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
983 * Unable to test, unit probably not ready. This usually
984 * means there is no disc in the drive. Mark as changed,
985 * and we will figure it out later once the drive is
988 if (retval
|| (scsi_sense_valid(sshdr
) &&
989 /* 0x3a is medium not present */
990 sshdr
->asc
== 0x3a)) {
991 set_media_not_present(sdkp
);
997 * For removable scsi disk we have to recognise the presence
998 * of a disk in the drive. This is kept in the struct scsi_disk
999 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1001 sdkp
->media_present
= 1;
1003 retval
= sdp
->changed
;
1006 if (retval
!= sdkp
->previous_state
)
1007 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
1008 sdkp
->previous_state
= retval
;
1013 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1016 struct scsi_device
*sdp
= sdkp
->device
;
1017 struct scsi_sense_hdr sshdr
;
1019 if (!scsi_device_online(sdp
))
1023 for (retries
= 3; retries
> 0; --retries
) {
1024 unsigned char cmd
[10] = { 0 };
1026 cmd
[0] = SYNCHRONIZE_CACHE
;
1028 * Leave the rest of the command zero to indicate
1031 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1032 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1038 sd_print_result(sdkp
, res
);
1039 if (driver_byte(res
) & DRIVER_SENSE
)
1040 sd_print_sense_hdr(sdkp
, &sshdr
);
1048 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
1050 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
1051 rq
->timeout
= SD_TIMEOUT
;
1052 rq
->retries
= SD_MAX_RETRIES
;
1053 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
1057 static void sd_rescan(struct device
*dev
)
1059 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1062 revalidate_disk(sdkp
->disk
);
1063 scsi_disk_put(sdkp
);
1068 #ifdef CONFIG_COMPAT
1070 * This gets directly called from VFS. When the ioctl
1071 * is not recognized we go back to the other translation paths.
1073 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1074 unsigned int cmd
, unsigned long arg
)
1076 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1079 * If we are in the middle of error recovery, don't let anyone
1080 * else try and use this device. Also, if error recovery fails, it
1081 * may try and take the device offline, in which case all further
1082 * access to the device is prohibited.
1084 if (!scsi_block_when_processing_errors(sdev
))
1087 if (sdev
->host
->hostt
->compat_ioctl
) {
1090 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1096 * Let the static ioctl translation table take care of it.
1098 return -ENOIOCTLCMD
;
1102 static const struct block_device_operations sd_fops
= {
1103 .owner
= THIS_MODULE
,
1105 .release
= sd_release
,
1106 .locked_ioctl
= sd_ioctl
,
1107 .getgeo
= sd_getgeo
,
1108 #ifdef CONFIG_COMPAT
1109 .compat_ioctl
= sd_compat_ioctl
,
1111 .media_changed
= sd_media_changed
,
1112 .revalidate_disk
= sd_revalidate_disk
,
1113 .unlock_native_capacity
= sd_unlock_native_capacity
,
1116 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1118 u64 start_lba
= blk_rq_pos(scmd
->request
);
1119 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1123 if (!blk_fs_request(scmd
->request
))
1126 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1127 SCSI_SENSE_BUFFERSIZE
,
1132 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1135 if (scmd
->device
->sector_size
< 512) {
1136 /* only legitimate sector_size here is 256 */
1140 /* be careful ... don't want any overflows */
1141 u64 factor
= scmd
->device
->sector_size
/ 512;
1142 do_div(start_lba
, factor
);
1143 do_div(end_lba
, factor
);
1146 /* The bad lba was reported incorrectly, we have no idea where
1149 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1152 /* This computation should always be done in terms of
1153 * the resolution of the device's medium.
1155 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1159 * sd_done - bottom half handler: called when the lower level
1160 * driver has completed (successfully or otherwise) a scsi command.
1161 * @SCpnt: mid-level's per command structure.
1163 * Note: potentially run from within an ISR. Must not block.
1165 static int sd_done(struct scsi_cmnd
*SCpnt
)
1167 int result
= SCpnt
->result
;
1168 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1169 struct scsi_sense_hdr sshdr
;
1170 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1171 int sense_valid
= 0;
1172 int sense_deferred
= 0;
1175 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1177 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1179 #ifdef CONFIG_SCSI_LOGGING
1180 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1182 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1183 "sd_done: sb[respc,sk,asc,"
1184 "ascq]=%x,%x,%x,%x\n",
1185 sshdr
.response_code
,
1186 sshdr
.sense_key
, sshdr
.asc
,
1190 if (driver_byte(result
) != DRIVER_SENSE
&&
1191 (!sense_valid
|| sense_deferred
))
1194 switch (sshdr
.sense_key
) {
1195 case HARDWARE_ERROR
:
1197 good_bytes
= sd_completed_bytes(SCpnt
);
1199 case RECOVERED_ERROR
:
1200 good_bytes
= scsi_bufflen(SCpnt
);
1203 /* This indicates a false check condition, so ignore it. An
1204 * unknown amount of data was transferred so treat it as an
1207 scsi_print_sense("sd", SCpnt
);
1209 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1211 case ABORTED_COMMAND
: /* DIF: Target detected corruption */
1212 case ILLEGAL_REQUEST
: /* DIX: Host detected corruption */
1213 if (sshdr
.asc
== 0x10)
1214 good_bytes
= sd_completed_bytes(SCpnt
);
1220 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1221 sd_dif_complete(SCpnt
, good_bytes
);
1223 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1224 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1226 /* We have to print a failed command here as the
1227 * extended CDB gets freed before scsi_io_completion()
1231 scsi_print_command(SCpnt
);
1233 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1241 static int media_not_present(struct scsi_disk
*sdkp
,
1242 struct scsi_sense_hdr
*sshdr
)
1245 if (!scsi_sense_valid(sshdr
))
1247 /* not invoked for commands that could return deferred errors */
1248 if (sshdr
->sense_key
!= NOT_READY
&&
1249 sshdr
->sense_key
!= UNIT_ATTENTION
)
1251 if (sshdr
->asc
!= 0x3A) /* medium not present */
1254 set_media_not_present(sdkp
);
1259 * spinup disk - called only in sd_revalidate_disk()
1262 sd_spinup_disk(struct scsi_disk
*sdkp
)
1264 unsigned char cmd
[10];
1265 unsigned long spintime_expire
= 0;
1266 int retries
, spintime
;
1267 unsigned int the_result
;
1268 struct scsi_sense_hdr sshdr
;
1269 int sense_valid
= 0;
1273 /* Spin up drives, as required. Only do this at boot time */
1274 /* Spinup needs to be done for module loads too. */
1279 cmd
[0] = TEST_UNIT_READY
;
1280 memset((void *) &cmd
[1], 0, 9);
1282 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1285 SD_MAX_RETRIES
, NULL
);
1288 * If the drive has indicated to us that it
1289 * doesn't have any media in it, don't bother
1290 * with any more polling.
1292 if (media_not_present(sdkp
, &sshdr
))
1296 sense_valid
= scsi_sense_valid(&sshdr
);
1298 } while (retries
< 3 &&
1299 (!scsi_status_is_good(the_result
) ||
1300 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1301 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1303 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1304 /* no sense, TUR either succeeded or failed
1305 * with a status error */
1306 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1307 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1308 sd_print_result(sdkp
, the_result
);
1314 * The device does not want the automatic start to be issued.
1316 if (sdkp
->device
->no_start_on_add
)
1319 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1320 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1321 break; /* manual intervention required */
1322 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1323 break; /* standby */
1324 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1325 break; /* unavailable */
1327 * Issue command to spin up drive when not ready
1330 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1331 cmd
[0] = START_STOP
;
1332 cmd
[1] = 1; /* Return immediately */
1333 memset((void *) &cmd
[2], 0, 8);
1334 cmd
[4] = 1; /* Start spin cycle */
1335 if (sdkp
->device
->start_stop_pwr_cond
)
1337 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1339 SD_TIMEOUT
, SD_MAX_RETRIES
,
1341 spintime_expire
= jiffies
+ 100 * HZ
;
1344 /* Wait 1 second for next try */
1349 * Wait for USB flash devices with slow firmware.
1350 * Yes, this sense key/ASC combination shouldn't
1351 * occur here. It's characteristic of these devices.
1353 } else if (sense_valid
&&
1354 sshdr
.sense_key
== UNIT_ATTENTION
&&
1355 sshdr
.asc
== 0x28) {
1357 spintime_expire
= jiffies
+ 5 * HZ
;
1360 /* Wait 1 second for next try */
1363 /* we don't understand the sense code, so it's
1364 * probably pointless to loop */
1366 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1367 sd_print_sense_hdr(sdkp
, &sshdr
);
1372 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1375 if (scsi_status_is_good(the_result
))
1378 printk("not responding...\n");
1384 * Determine whether disk supports Data Integrity Field.
1386 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1388 struct scsi_device
*sdp
= sdkp
->device
;
1391 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1394 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1396 if (type
== sdkp
->protection_type
|| !sdkp
->first_scan
)
1399 sdkp
->protection_type
= type
;
1401 if (type
> SD_DIF_TYPE3_PROTECTION
) {
1402 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported " \
1403 "protection type %u. Disabling disk!\n", type
);
1408 if (scsi_host_dif_capable(sdp
->host
, type
))
1409 sd_printk(KERN_NOTICE
, sdkp
,
1410 "Enabling DIF Type %u protection\n", type
);
1412 sd_printk(KERN_NOTICE
, sdkp
,
1413 "Disabling DIF Type %u protection\n", type
);
1416 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1417 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1420 sd_print_result(sdkp
, the_result
);
1421 if (driver_byte(the_result
) & DRIVER_SENSE
)
1422 sd_print_sense_hdr(sdkp
, sshdr
);
1424 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1427 * Set dirty bit for removable devices if not ready -
1428 * sometimes drives will not report this properly.
1430 if (sdp
->removable
&&
1431 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1435 * We used to set media_present to 0 here to indicate no media
1436 * in the drive, but some drives fail read capacity even with
1437 * media present, so we can't do that.
1439 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1443 #if RC16_LEN > SD_BUF_SIZE
1444 #error RC16_LEN must not be more than SD_BUF_SIZE
1447 #define READ_CAPACITY_RETRIES_ON_RESET 10
1449 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1450 unsigned char *buffer
)
1452 unsigned char cmd
[16];
1453 struct scsi_sense_hdr sshdr
;
1454 int sense_valid
= 0;
1456 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1457 unsigned int alignment
;
1458 unsigned long long lba
;
1459 unsigned sector_size
;
1463 cmd
[0] = SERVICE_ACTION_IN
;
1464 cmd
[1] = SAI_READ_CAPACITY_16
;
1466 memset(buffer
, 0, RC16_LEN
);
1468 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1469 buffer
, RC16_LEN
, &sshdr
,
1470 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1472 if (media_not_present(sdkp
, &sshdr
))
1476 sense_valid
= scsi_sense_valid(&sshdr
);
1478 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1479 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1481 /* Invalid Command Operation Code or
1482 * Invalid Field in CDB, just retry
1483 * silently with RC10 */
1486 sshdr
.sense_key
== UNIT_ATTENTION
&&
1487 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1488 /* Device reset might occur several times,
1489 * give it one more chance */
1490 if (--reset_retries
> 0)
1495 } while (the_result
&& retries
);
1498 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1499 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1503 sector_size
= get_unaligned_be32(&buffer
[8]);
1504 lba
= get_unaligned_be64(&buffer
[0]);
1506 sd_read_protection_type(sdkp
, buffer
);
1508 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1509 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1510 "kernel compiled with support for large block "
1516 /* Logical blocks per physical block exponent */
1517 sdkp
->hw_sector_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1519 /* Lowest aligned logical block */
1520 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1521 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1522 if (alignment
&& sdkp
->first_scan
)
1523 sd_printk(KERN_NOTICE
, sdkp
,
1524 "physical block alignment offset: %u\n", alignment
);
1526 if (buffer
[14] & 0x80) { /* TPE */
1527 struct request_queue
*q
= sdp
->request_queue
;
1529 sdkp
->thin_provisioning
= 1;
1530 q
->limits
.discard_granularity
= sdkp
->hw_sector_size
;
1531 q
->limits
.max_discard_sectors
= 0xffffffff;
1533 if (buffer
[14] & 0x40) /* TPRZ */
1534 q
->limits
.discard_zeroes_data
= 1;
1536 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
1539 sdkp
->capacity
= lba
+ 1;
1543 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1544 unsigned char *buffer
)
1546 unsigned char cmd
[16];
1547 struct scsi_sense_hdr sshdr
;
1548 int sense_valid
= 0;
1550 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1552 unsigned sector_size
;
1555 cmd
[0] = READ_CAPACITY
;
1556 memset(&cmd
[1], 0, 9);
1557 memset(buffer
, 0, 8);
1559 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1561 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1563 if (media_not_present(sdkp
, &sshdr
))
1567 sense_valid
= scsi_sense_valid(&sshdr
);
1569 sshdr
.sense_key
== UNIT_ATTENTION
&&
1570 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1571 /* Device reset might occur several times,
1572 * give it one more chance */
1573 if (--reset_retries
> 0)
1578 } while (the_result
&& retries
);
1581 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1582 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1586 sector_size
= get_unaligned_be32(&buffer
[4]);
1587 lba
= get_unaligned_be32(&buffer
[0]);
1589 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1590 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1591 "kernel compiled with support for large block "
1597 sdkp
->capacity
= lba
+ 1;
1598 sdkp
->hw_sector_size
= sector_size
;
1602 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1604 if (sdp
->host
->max_cmd_len
< 16)
1606 if (sdp
->scsi_level
> SCSI_SPC_2
)
1608 if (scsi_device_protection(sdp
))
1614 * read disk capacity
1617 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1620 struct scsi_device
*sdp
= sdkp
->device
;
1621 sector_t old_capacity
= sdkp
->capacity
;
1623 if (sd_try_rc16_first(sdp
)) {
1624 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1625 if (sector_size
== -EOVERFLOW
)
1627 if (sector_size
== -ENODEV
)
1629 if (sector_size
< 0)
1630 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1631 if (sector_size
< 0)
1634 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1635 if (sector_size
== -EOVERFLOW
)
1637 if (sector_size
< 0)
1639 if ((sizeof(sdkp
->capacity
) > 4) &&
1640 (sdkp
->capacity
> 0xffffffffULL
)) {
1641 int old_sector_size
= sector_size
;
1642 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1643 "Trying to use READ CAPACITY(16).\n");
1644 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1645 if (sector_size
< 0) {
1646 sd_printk(KERN_NOTICE
, sdkp
,
1647 "Using 0xffffffff as device size\n");
1648 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1649 sector_size
= old_sector_size
;
1655 /* Some devices are known to return the total number of blocks,
1656 * not the highest block number. Some devices have versions
1657 * which do this and others which do not. Some devices we might
1658 * suspect of doing this but we don't know for certain.
1660 * If we know the reported capacity is wrong, decrement it. If
1661 * we can only guess, then assume the number of blocks is even
1662 * (usually true but not always) and err on the side of lowering
1665 if (sdp
->fix_capacity
||
1666 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1667 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1668 "from its reported value: %llu\n",
1669 (unsigned long long) sdkp
->capacity
);
1674 if (sector_size
== 0) {
1676 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1680 if (sector_size
!= 512 &&
1681 sector_size
!= 1024 &&
1682 sector_size
!= 2048 &&
1683 sector_size
!= 4096 &&
1684 sector_size
!= 256) {
1685 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1688 * The user might want to re-format the drive with
1689 * a supported sectorsize. Once this happens, it
1690 * would be relatively trivial to set the thing up.
1691 * For this reason, we leave the thing in the table.
1695 * set a bogus sector size so the normal read/write
1696 * logic in the block layer will eventually refuse any
1697 * request on this device without tripping over power
1698 * of two sector size assumptions
1702 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
1705 char cap_str_2
[10], cap_str_10
[10];
1706 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1708 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1710 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1711 sizeof(cap_str_10
));
1713 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
1714 sd_printk(KERN_NOTICE
, sdkp
,
1715 "%llu %d-byte logical blocks: (%s/%s)\n",
1716 (unsigned long long)sdkp
->capacity
,
1717 sector_size
, cap_str_10
, cap_str_2
);
1719 if (sdkp
->hw_sector_size
!= sector_size
)
1720 sd_printk(KERN_NOTICE
, sdkp
,
1721 "%u-byte physical blocks\n",
1722 sdkp
->hw_sector_size
);
1726 /* Rescale capacity to 512-byte units */
1727 if (sector_size
== 4096)
1728 sdkp
->capacity
<<= 3;
1729 else if (sector_size
== 2048)
1730 sdkp
->capacity
<<= 2;
1731 else if (sector_size
== 1024)
1732 sdkp
->capacity
<<= 1;
1733 else if (sector_size
== 256)
1734 sdkp
->capacity
>>= 1;
1736 blk_queue_physical_block_size(sdp
->request_queue
, sdkp
->hw_sector_size
);
1737 sdkp
->device
->sector_size
= sector_size
;
1740 /* called with buffer of length 512 */
1742 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1743 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1744 struct scsi_sense_hdr
*sshdr
)
1746 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1747 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1752 * read write protect setting, if possible - called only in sd_revalidate_disk()
1753 * called with buffer of length SD_BUF_SIZE
1756 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1759 struct scsi_device
*sdp
= sdkp
->device
;
1760 struct scsi_mode_data data
;
1761 int old_wp
= sdkp
->write_prot
;
1763 set_disk_ro(sdkp
->disk
, 0);
1764 if (sdp
->skip_ms_page_3f
) {
1765 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1769 if (sdp
->use_192_bytes_for_3f
) {
1770 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1773 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1774 * We have to start carefully: some devices hang if we ask
1775 * for more than is available.
1777 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1780 * Second attempt: ask for page 0 When only page 0 is
1781 * implemented, a request for page 3F may return Sense Key
1782 * 5: Illegal Request, Sense Code 24: Invalid field in
1785 if (!scsi_status_is_good(res
))
1786 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1789 * Third attempt: ask 255 bytes, as we did earlier.
1791 if (!scsi_status_is_good(res
))
1792 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1796 if (!scsi_status_is_good(res
)) {
1797 sd_printk(KERN_WARNING
, sdkp
,
1798 "Test WP failed, assume Write Enabled\n");
1800 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1801 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1802 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
1803 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1804 sdkp
->write_prot
? "on" : "off");
1805 sd_printk(KERN_DEBUG
, sdkp
,
1806 "Mode Sense: %02x %02x %02x %02x\n",
1807 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1813 * sd_read_cache_type - called only from sd_revalidate_disk()
1814 * called with buffer of length SD_BUF_SIZE
1817 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1820 struct scsi_device
*sdp
= sdkp
->device
;
1824 struct scsi_mode_data data
;
1825 struct scsi_sense_hdr sshdr
;
1826 int old_wce
= sdkp
->WCE
;
1827 int old_rcd
= sdkp
->RCD
;
1828 int old_dpofua
= sdkp
->DPOFUA
;
1830 if (sdp
->skip_ms_page_8
)
1833 if (sdp
->type
== TYPE_RBC
) {
1841 /* cautiously ask */
1842 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1844 if (!scsi_status_is_good(res
))
1847 if (!data
.header_length
) {
1849 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1852 /* that went OK, now ask for the proper length */
1856 * We're only interested in the first three bytes, actually.
1857 * But the data cache page is defined for the first 20.
1864 /* Take headers and block descriptors into account */
1865 len
+= data
.header_length
+ data
.block_descriptor_length
;
1866 if (len
> SD_BUF_SIZE
)
1870 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1872 if (scsi_status_is_good(res
)) {
1873 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1875 if (offset
>= SD_BUF_SIZE
- 2) {
1876 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1880 if ((buffer
[offset
] & 0x3f) != modepage
) {
1881 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1885 if (modepage
== 8) {
1886 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1887 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1889 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1893 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1894 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1895 sd_printk(KERN_NOTICE
, sdkp
,
1896 "Uses READ/WRITE(6), disabling FUA\n");
1900 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
1901 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
1902 sd_printk(KERN_NOTICE
, sdkp
,
1903 "Write cache: %s, read cache: %s, %s\n",
1904 sdkp
->WCE
? "enabled" : "disabled",
1905 sdkp
->RCD
? "disabled" : "enabled",
1906 sdkp
->DPOFUA
? "supports DPO and FUA"
1907 : "doesn't support DPO or FUA");
1913 if (scsi_sense_valid(&sshdr
) &&
1914 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1915 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1916 /* Invalid field in CDB */
1917 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1919 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1922 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1929 * The ATO bit indicates whether the DIF application tag is available
1930 * for use by the operating system.
1932 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1935 struct scsi_device
*sdp
= sdkp
->device
;
1936 struct scsi_mode_data data
;
1937 struct scsi_sense_hdr sshdr
;
1939 if (sdp
->type
!= TYPE_DISK
)
1942 if (sdkp
->protection_type
== 0)
1945 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1946 SD_MAX_RETRIES
, &data
, &sshdr
);
1948 if (!scsi_status_is_good(res
) || !data
.header_length
||
1950 sd_printk(KERN_WARNING
, sdkp
,
1951 "getting Control mode page failed, assume no ATO\n");
1953 if (scsi_sense_valid(&sshdr
))
1954 sd_print_sense_hdr(sdkp
, &sshdr
);
1959 offset
= data
.header_length
+ data
.block_descriptor_length
;
1961 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1962 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1966 if ((buffer
[offset
+ 5] & 0x80) == 0)
1975 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1976 * @disk: disk to query
1978 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
1980 struct request_queue
*q
= sdkp
->disk
->queue
;
1981 unsigned int sector_sz
= sdkp
->device
->sector_size
;
1982 const int vpd_len
= 64;
1983 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
1986 /* Block Limits VPD */
1987 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
1990 blk_queue_io_min(sdkp
->disk
->queue
,
1991 get_unaligned_be16(&buffer
[6]) * sector_sz
);
1992 blk_queue_io_opt(sdkp
->disk
->queue
,
1993 get_unaligned_be32(&buffer
[12]) * sector_sz
);
1995 /* Thin provisioning enabled and page length indicates TP support */
1996 if (sdkp
->thin_provisioning
&& buffer
[3] == 0x3c) {
1997 unsigned int lba_count
, desc_count
, granularity
;
1999 lba_count
= get_unaligned_be32(&buffer
[20]);
2000 desc_count
= get_unaligned_be32(&buffer
[24]);
2003 q
->limits
.max_discard_sectors
=
2004 lba_count
* sector_sz
>> 9;
2010 granularity
= get_unaligned_be32(&buffer
[28]);
2013 q
->limits
.discard_granularity
= granularity
* sector_sz
;
2015 if (buffer
[32] & 0x80)
2016 q
->limits
.discard_alignment
=
2017 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2025 * sd_read_block_characteristics - Query block dev. characteristics
2026 * @disk: disk to query
2028 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2030 unsigned char *buffer
;
2032 const int vpd_len
= 64;
2034 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2037 /* Block Device Characteristics VPD */
2038 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2041 rot
= get_unaligned_be16(&buffer
[4]);
2044 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2050 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2053 * Although VPD inquiries can go to SCSI-2 type devices,
2054 * some USB ones crash on receiving them, and the pages
2055 * we currently ask for are for SPC-3 and beyond
2057 if (sdp
->scsi_level
> SCSI_SPC_2
)
2063 * sd_revalidate_disk - called the first time a new disk is seen,
2064 * performs disk spin up, read_capacity, etc.
2065 * @disk: struct gendisk we care about
2067 static int sd_revalidate_disk(struct gendisk
*disk
)
2069 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2070 struct scsi_device
*sdp
= sdkp
->device
;
2071 unsigned char *buffer
;
2074 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2075 "sd_revalidate_disk\n"));
2078 * If the device is offline, don't try and read capacity or any
2079 * of the other niceties.
2081 if (!scsi_device_online(sdp
))
2084 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2086 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2087 "allocation failure.\n");
2091 sd_spinup_disk(sdkp
);
2094 * Without media there is no reason to ask; moreover, some devices
2095 * react badly if we do.
2097 if (sdkp
->media_present
) {
2098 sd_read_capacity(sdkp
, buffer
);
2100 if (sd_try_extended_inquiry(sdp
)) {
2101 sd_read_block_limits(sdkp
);
2102 sd_read_block_characteristics(sdkp
);
2105 sd_read_write_protect_flag(sdkp
, buffer
);
2106 sd_read_cache_type(sdkp
, buffer
);
2107 sd_read_app_tag_own(sdkp
, buffer
);
2110 sdkp
->first_scan
= 0;
2113 * We now have all cache related info, determine how we deal
2114 * with ordered requests. Note that as the current SCSI
2115 * dispatch function can alter request order, we cannot use
2116 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2119 ordered
= sdkp
->DPOFUA
2120 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
2122 ordered
= QUEUE_ORDERED_DRAIN
;
2124 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
2126 set_capacity(disk
, sdkp
->capacity
);
2134 * sd_unlock_native_capacity - unlock native capacity
2135 * @disk: struct gendisk to set capacity for
2137 * Block layer calls this function if it detects that partitions
2138 * on @disk reach beyond the end of the device. If the SCSI host
2139 * implements ->unlock_native_capacity() method, it's invoked to
2140 * give it a chance to adjust the device capacity.
2143 * Defined by block layer. Might sleep.
2145 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2147 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2149 if (sdev
->host
->hostt
->unlock_native_capacity
)
2150 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2154 * sd_format_disk_name - format disk name
2155 * @prefix: name prefix - ie. "sd" for SCSI disks
2156 * @index: index of the disk to format name for
2157 * @buf: output buffer
2158 * @buflen: length of the output buffer
2160 * SCSI disk names starts at sda. The 26th device is sdz and the
2161 * 27th is sdaa. The last one for two lettered suffix is sdzz
2162 * which is followed by sdaaa.
2164 * This is basically 26 base counting with one extra 'nil' entry
2165 * at the beginning from the second digit on and can be
2166 * determined using similar method as 26 base conversion with the
2167 * index shifted -1 after each digit is computed.
2173 * 0 on success, -errno on failure.
2175 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2177 const int base
= 'z' - 'a' + 1;
2178 char *begin
= buf
+ strlen(prefix
);
2179 char *end
= buf
+ buflen
;
2189 *--p
= 'a' + (index
% unit
);
2190 index
= (index
/ unit
) - 1;
2191 } while (index
>= 0);
2193 memmove(begin
, p
, end
- p
);
2194 memcpy(buf
, prefix
, strlen(prefix
));
2200 * The asynchronous part of sd_probe
2202 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2204 struct scsi_disk
*sdkp
= data
;
2205 struct scsi_device
*sdp
;
2212 index
= sdkp
->index
;
2213 dev
= &sdp
->sdev_gendev
;
2215 if (index
< SD_MAX_DISKS
) {
2216 gd
->major
= sd_major((index
& 0xf0) >> 4);
2217 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2218 gd
->minors
= SD_MINORS
;
2220 gd
->fops
= &sd_fops
;
2221 gd
->private_data
= &sdkp
->driver
;
2222 gd
->queue
= sdkp
->device
->request_queue
;
2224 /* defaults, until the device tells us otherwise */
2225 sdp
->sector_size
= 512;
2227 sdkp
->media_present
= 1;
2228 sdkp
->write_prot
= 0;
2232 sdkp
->first_scan
= 1;
2234 sd_revalidate_disk(gd
);
2236 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2238 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2239 gd
->flags
= GENHD_FL_EXT_DEVT
;
2241 gd
->flags
|= GENHD_FL_REMOVABLE
;
2244 sd_dif_config_host(sdkp
);
2246 sd_revalidate_disk(gd
);
2248 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2249 sdp
->removable
? "removable " : "");
2250 scsi_autopm_put_device(sdp
);
2251 put_device(&sdkp
->dev
);
2255 * sd_probe - called during driver initialization and whenever a
2256 * new scsi device is attached to the system. It is called once
2257 * for each scsi device (not just disks) present.
2258 * @dev: pointer to device object
2260 * Returns 0 if successful (or not interested in this scsi device
2261 * (e.g. scanner)); 1 when there is an error.
2263 * Note: this function is invoked from the scsi mid-level.
2264 * This function sets up the mapping between a given
2265 * <host,channel,id,lun> (found in sdp) and new device name
2266 * (e.g. /dev/sda). More precisely it is the block device major
2267 * and minor number that is chosen here.
2269 * Assume sd_attach is not re-entrant (for time being)
2270 * Also think about sd_attach() and sd_remove() running coincidentally.
2272 static int sd_probe(struct device
*dev
)
2274 struct scsi_device
*sdp
= to_scsi_device(dev
);
2275 struct scsi_disk
*sdkp
;
2281 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2284 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2288 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2292 gd
= alloc_disk(SD_MINORS
);
2297 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2300 spin_lock(&sd_index_lock
);
2301 error
= ida_get_new(&sd_index_ida
, &index
);
2302 spin_unlock(&sd_index_lock
);
2303 } while (error
== -EAGAIN
);
2308 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2310 goto out_free_index
;
2313 sdkp
->driver
= &sd_template
;
2315 sdkp
->index
= index
;
2317 sdkp
->previous_state
= 1;
2319 if (!sdp
->request_queue
->rq_timeout
) {
2320 if (sdp
->type
!= TYPE_MOD
)
2321 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2323 blk_queue_rq_timeout(sdp
->request_queue
,
2327 device_initialize(&sdkp
->dev
);
2328 sdkp
->dev
.parent
= dev
;
2329 sdkp
->dev
.class = &sd_disk_class
;
2330 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2332 if (device_add(&sdkp
->dev
))
2333 goto out_free_index
;
2336 dev_set_drvdata(dev
, sdkp
);
2338 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2339 async_schedule(sd_probe_async
, sdkp
);
2344 spin_lock(&sd_index_lock
);
2345 ida_remove(&sd_index_ida
, index
);
2346 spin_unlock(&sd_index_lock
);
2356 * sd_remove - called whenever a scsi disk (previously recognized by
2357 * sd_probe) is detached from the system. It is called (potentially
2358 * multiple times) during sd module unload.
2359 * @sdp: pointer to mid level scsi device object
2361 * Note: this function is invoked from the scsi mid-level.
2362 * This function potentially frees up a device name (e.g. /dev/sdc)
2363 * that could be re-used by a subsequent sd_probe().
2364 * This function is not called when the built-in sd driver is "exit-ed".
2366 static int sd_remove(struct device
*dev
)
2368 struct scsi_disk
*sdkp
;
2370 sdkp
= dev_get_drvdata(dev
);
2371 scsi_autopm_get_device(sdkp
->device
);
2373 async_synchronize_full();
2374 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2375 device_del(&sdkp
->dev
);
2376 del_gendisk(sdkp
->disk
);
2379 mutex_lock(&sd_ref_mutex
);
2380 dev_set_drvdata(dev
, NULL
);
2381 put_device(&sdkp
->dev
);
2382 mutex_unlock(&sd_ref_mutex
);
2388 * scsi_disk_release - Called to free the scsi_disk structure
2389 * @dev: pointer to embedded class device
2391 * sd_ref_mutex must be held entering this routine. Because it is
2392 * called on last put, you should always use the scsi_disk_get()
2393 * scsi_disk_put() helpers which manipulate the semaphore directly
2394 * and never do a direct put_device.
2396 static void scsi_disk_release(struct device
*dev
)
2398 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2399 struct gendisk
*disk
= sdkp
->disk
;
2401 spin_lock(&sd_index_lock
);
2402 ida_remove(&sd_index_ida
, sdkp
->index
);
2403 spin_unlock(&sd_index_lock
);
2405 disk
->private_data
= NULL
;
2407 put_device(&sdkp
->device
->sdev_gendev
);
2412 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2414 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2415 struct scsi_sense_hdr sshdr
;
2416 struct scsi_device
*sdp
= sdkp
->device
;
2420 cmd
[4] |= 1; /* START */
2422 if (sdp
->start_stop_pwr_cond
)
2423 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2425 if (!scsi_device_online(sdp
))
2428 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2429 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2431 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2432 sd_print_result(sdkp
, res
);
2433 if (driver_byte(res
) & DRIVER_SENSE
)
2434 sd_print_sense_hdr(sdkp
, &sshdr
);
2441 * Send a SYNCHRONIZE CACHE instruction down to the device through
2442 * the normal SCSI command structure. Wait for the command to
2445 static void sd_shutdown(struct device
*dev
)
2447 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2450 return; /* this can happen */
2453 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2454 sd_sync_cache(sdkp
);
2457 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2458 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2459 sd_start_stop_device(sdkp
, 0);
2462 scsi_disk_put(sdkp
);
2465 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2467 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2471 return 0; /* this can happen */
2474 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2475 ret
= sd_sync_cache(sdkp
);
2480 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2481 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2482 ret
= sd_start_stop_device(sdkp
, 0);
2486 scsi_disk_put(sdkp
);
2490 static int sd_resume(struct device
*dev
)
2492 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2495 if (!sdkp
->device
->manage_start_stop
)
2498 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2499 ret
= sd_start_stop_device(sdkp
, 1);
2502 scsi_disk_put(sdkp
);
2507 * init_sd - entry point for this driver (both when built in or when
2510 * Note: this function registers this driver with the scsi mid-level.
2512 static int __init
init_sd(void)
2514 int majors
= 0, i
, err
;
2516 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2518 for (i
= 0; i
< SD_MAJORS
; i
++)
2519 if (register_blkdev(sd_major(i
), "sd") == 0)
2525 err
= class_register(&sd_disk_class
);
2529 err
= scsi_register_driver(&sd_template
.gendrv
);
2533 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2535 if (!sd_cdb_cache
) {
2536 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2540 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2542 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2549 kmem_cache_destroy(sd_cdb_cache
);
2552 class_unregister(&sd_disk_class
);
2554 for (i
= 0; i
< SD_MAJORS
; i
++)
2555 unregister_blkdev(sd_major(i
), "sd");
2560 * exit_sd - exit point for this driver (when it is a module).
2562 * Note: this function unregisters this driver from the scsi mid-level.
2564 static void __exit
exit_sd(void)
2568 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2570 mempool_destroy(sd_cdb_pool
);
2571 kmem_cache_destroy(sd_cdb_cache
);
2573 scsi_unregister_driver(&sd_template
.gendrv
);
2574 class_unregister(&sd_disk_class
);
2576 for (i
= 0; i
< SD_MAJORS
; i
++)
2577 unregister_blkdev(sd_major(i
), "sd");
2580 module_init(init_sd
);
2581 module_exit(exit_sd
);
2583 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2584 struct scsi_sense_hdr
*sshdr
)
2586 sd_printk(KERN_INFO
, sdkp
, "");
2587 scsi_show_sense_hdr(sshdr
);
2588 sd_printk(KERN_INFO
, sdkp
, "");
2589 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2592 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2594 sd_printk(KERN_INFO
, sdkp
, "");
2595 scsi_show_result(result
);