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 <asm/uaccess.h>
53 #include <asm/unaligned.h>
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_device.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_eh.h>
61 #include <scsi/scsi_host.h>
62 #include <scsi/scsi_ioctl.h>
63 #include <scsi/scsicam.h>
66 #include "scsi_logging.h"
68 MODULE_AUTHOR("Eric Youngdale");
69 MODULE_DESCRIPTION("SCSI disk (sd) driver");
70 MODULE_LICENSE("GPL");
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
92 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
98 static int sd_revalidate_disk(struct gendisk
*);
99 static int sd_probe(struct device
*);
100 static int sd_remove(struct device
*);
101 static void sd_shutdown(struct device
*);
102 static int sd_suspend(struct device
*, pm_message_t state
);
103 static int sd_resume(struct device
*);
104 static void sd_rescan(struct device
*);
105 static int sd_done(struct scsi_cmnd
*);
106 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
107 static void scsi_disk_release(struct device
*cdev
);
108 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
109 static void sd_print_result(struct scsi_disk
*, int);
111 static DEFINE_SPINLOCK(sd_index_lock
);
112 static DEFINE_IDA(sd_index_ida
);
114 /* This semaphore is used to mediate the 0->1 reference get in the
115 * face of object destruction (i.e. we can't allow a get on an
116 * object after last put) */
117 static DEFINE_MUTEX(sd_ref_mutex
);
119 struct kmem_cache
*sd_cdb_cache
;
120 mempool_t
*sd_cdb_pool
;
122 static const char *sd_cache_types
[] = {
123 "write through", "none", "write back",
124 "write back, no read (daft)"
128 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
129 const char *buf
, size_t count
)
131 int i
, ct
= -1, rcd
, wce
, sp
;
132 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
133 struct scsi_device
*sdp
= sdkp
->device
;
136 struct scsi_mode_data data
;
137 struct scsi_sense_hdr sshdr
;
140 if (sdp
->type
!= TYPE_DISK
)
141 /* no cache control on RBC devices; theoretically they
142 * can do it, but there's probably so many exceptions
143 * it's not worth the risk */
146 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
147 const int len
= strlen(sd_cache_types
[i
]);
148 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
156 rcd
= ct
& 0x01 ? 1 : 0;
157 wce
= ct
& 0x02 ? 1 : 0;
158 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
159 SD_MAX_RETRIES
, &data
, NULL
))
161 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
162 data
.block_descriptor_length
);
163 buffer_data
= buffer
+ data
.header_length
+
164 data
.block_descriptor_length
;
165 buffer_data
[2] &= ~0x05;
166 buffer_data
[2] |= wce
<< 2 | rcd
;
167 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
169 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
170 SD_MAX_RETRIES
, &data
, &sshdr
)) {
171 if (scsi_sense_valid(&sshdr
))
172 sd_print_sense_hdr(sdkp
, &sshdr
);
175 revalidate_disk(sdkp
->disk
);
180 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
181 const char *buf
, size_t count
)
183 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
184 struct scsi_device
*sdp
= sdkp
->device
;
186 if (!capable(CAP_SYS_ADMIN
))
189 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
195 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
196 const char *buf
, size_t count
)
198 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
199 struct scsi_device
*sdp
= sdkp
->device
;
201 if (!capable(CAP_SYS_ADMIN
))
204 if (sdp
->type
!= TYPE_DISK
)
207 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
213 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
216 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
217 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
219 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
223 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
225 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
227 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
231 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
234 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
235 struct scsi_device
*sdp
= sdkp
->device
;
237 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
241 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
244 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
246 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
250 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
253 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
255 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
259 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
262 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
264 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
267 static struct device_attribute sd_disk_attrs
[] = {
268 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
269 sd_store_cache_type
),
270 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
271 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
272 sd_store_allow_restart
),
273 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
274 sd_store_manage_start_stop
),
275 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
276 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
280 static struct class sd_disk_class
= {
282 .owner
= THIS_MODULE
,
283 .dev_release
= scsi_disk_release
,
284 .dev_attrs
= sd_disk_attrs
,
287 static struct scsi_driver sd_template
= {
288 .owner
= THIS_MODULE
,
293 .suspend
= sd_suspend
,
295 .shutdown
= sd_shutdown
,
302 * Device no to disk mapping:
304 * major disc2 disc p1
305 * |............|.............|....|....| <- dev_t
308 * Inside a major, we have 16k disks, however mapped non-
309 * contiguously. The first 16 disks are for major0, the next
310 * ones with major1, ... Disk 256 is for major0 again, disk 272
312 * As we stay compatible with our numbering scheme, we can reuse
313 * the well-know SCSI majors 8, 65--71, 136--143.
315 static int sd_major(int major_idx
)
319 return SCSI_DISK0_MAJOR
;
321 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
323 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
326 return 0; /* shut up gcc */
330 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
332 struct scsi_disk
*sdkp
= NULL
;
334 if (disk
->private_data
) {
335 sdkp
= scsi_disk(disk
);
336 if (scsi_device_get(sdkp
->device
) == 0)
337 get_device(&sdkp
->dev
);
344 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
346 struct scsi_disk
*sdkp
;
348 mutex_lock(&sd_ref_mutex
);
349 sdkp
= __scsi_disk_get(disk
);
350 mutex_unlock(&sd_ref_mutex
);
354 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
356 struct scsi_disk
*sdkp
;
358 mutex_lock(&sd_ref_mutex
);
359 sdkp
= dev_get_drvdata(dev
);
361 sdkp
= __scsi_disk_get(sdkp
->disk
);
362 mutex_unlock(&sd_ref_mutex
);
366 static void scsi_disk_put(struct scsi_disk
*sdkp
)
368 struct scsi_device
*sdev
= sdkp
->device
;
370 mutex_lock(&sd_ref_mutex
);
371 put_device(&sdkp
->dev
);
372 scsi_device_put(sdev
);
373 mutex_unlock(&sd_ref_mutex
);
376 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
378 unsigned int prot_op
= SCSI_PROT_NORMAL
;
379 unsigned int dix
= scsi_prot_sg_count(scmd
);
381 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
383 prot_op
= SCSI_PROT_READ_PASS
;
384 else if (dif
&& !dix
)
385 prot_op
= SCSI_PROT_READ_STRIP
;
386 else if (!dif
&& dix
)
387 prot_op
= SCSI_PROT_READ_INSERT
;
390 prot_op
= SCSI_PROT_WRITE_PASS
;
391 else if (dif
&& !dix
)
392 prot_op
= SCSI_PROT_WRITE_INSERT
;
393 else if (!dif
&& dix
)
394 prot_op
= SCSI_PROT_WRITE_STRIP
;
397 scsi_set_prot_op(scmd
, prot_op
);
398 scsi_set_prot_type(scmd
, dif
);
402 * sd_init_command - build a scsi (read or write) command from
403 * information in the request structure.
404 * @SCpnt: pointer to mid-level's per scsi command structure that
405 * contains request and into which the scsi command is written
407 * Returns 1 if successful and 0 if error (or cannot be done now).
409 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
411 struct scsi_cmnd
*SCpnt
;
412 struct scsi_device
*sdp
= q
->queuedata
;
413 struct gendisk
*disk
= rq
->rq_disk
;
414 struct scsi_disk
*sdkp
;
415 sector_t block
= blk_rq_pos(rq
);
417 unsigned int this_count
= blk_rq_sectors(rq
);
419 unsigned char protect
;
421 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
422 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
424 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
428 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
429 if (ret
!= BLKPREP_OK
)
432 sdkp
= scsi_disk(disk
);
434 /* from here on until we're complete, any goto out
435 * is used for a killable error condition */
438 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
439 "sd_init_command: block=%llu, "
441 (unsigned long long)block
,
444 if (!sdp
|| !scsi_device_online(sdp
) ||
445 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
446 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
447 "Finishing %u sectors\n",
448 blk_rq_sectors(rq
)));
449 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
450 "Retry with 0x%p\n", SCpnt
));
456 * quietly refuse to do anything to a changed disc until
457 * the changed bit has been reset
459 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
464 * Some SD card readers can't handle multi-sector accesses which touch
465 * the last one or two hardware sectors. Split accesses as needed.
467 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
468 (sdp
->sector_size
/ 512);
470 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
471 if (block
< threshold
) {
472 /* Access up to the threshold but not beyond */
473 this_count
= threshold
- block
;
475 /* Access only a single hardware sector */
476 this_count
= sdp
->sector_size
/ 512;
480 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
481 (unsigned long long)block
));
484 * If we have a 1K hardware sectorsize, prevent access to single
485 * 512 byte sectors. In theory we could handle this - in fact
486 * the scsi cdrom driver must be able to handle this because
487 * we typically use 1K blocksizes, and cdroms typically have
488 * 2K hardware sectorsizes. Of course, things are simpler
489 * with the cdrom, since it is read-only. For performance
490 * reasons, the filesystems should be able to handle this
491 * and not force the scsi disk driver to use bounce buffers
494 if (sdp
->sector_size
== 1024) {
495 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
496 scmd_printk(KERN_ERR
, SCpnt
,
497 "Bad block number requested\n");
501 this_count
= this_count
>> 1;
504 if (sdp
->sector_size
== 2048) {
505 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
506 scmd_printk(KERN_ERR
, SCpnt
,
507 "Bad block number requested\n");
511 this_count
= this_count
>> 2;
514 if (sdp
->sector_size
== 4096) {
515 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
516 scmd_printk(KERN_ERR
, SCpnt
,
517 "Bad block number requested\n");
521 this_count
= this_count
>> 3;
524 if (rq_data_dir(rq
) == WRITE
) {
525 if (!sdp
->writeable
) {
528 SCpnt
->cmnd
[0] = WRITE_6
;
529 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
531 if (blk_integrity_rq(rq
) &&
532 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
535 } else if (rq_data_dir(rq
) == READ
) {
536 SCpnt
->cmnd
[0] = READ_6
;
537 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
539 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
543 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
544 "%s %d/%u 512 byte blocks.\n",
545 (rq_data_dir(rq
) == WRITE
) ?
546 "writing" : "reading", this_count
,
547 blk_rq_sectors(rq
)));
549 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
550 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
556 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
557 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
559 if (unlikely(SCpnt
->cmnd
== NULL
)) {
564 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
565 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
566 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
567 SCpnt
->cmnd
[7] = 0x18;
568 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
569 SCpnt
->cmnd
[10] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
572 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
573 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
574 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
575 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
576 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
577 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
578 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
579 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
581 /* Expected Indirect LBA */
582 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
583 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
584 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
585 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
587 /* Transfer length */
588 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
589 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
590 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
591 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
592 } else if (block
> 0xffffffff) {
593 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
594 SCpnt
->cmnd
[1] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
595 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
596 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
597 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
598 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
599 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
600 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
601 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
602 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
603 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
604 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
605 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
606 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
607 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
608 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
609 scsi_device_protection(SCpnt
->device
) ||
610 SCpnt
->device
->use_10_for_rw
) {
611 if (this_count
> 0xffff)
614 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
615 SCpnt
->cmnd
[1] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
616 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
617 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
618 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
619 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
620 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
621 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
622 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
624 if (unlikely(blk_fua_rq(rq
))) {
626 * This happens only if this drive failed
627 * 10byte rw command with ILLEGAL_REQUEST
628 * during operation and thus turned off
631 scmd_printk(KERN_ERR
, SCpnt
,
632 "FUA write on READ/WRITE(6) drive\n");
636 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
637 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
638 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
639 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
642 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
644 /* If DIF or DIX is enabled, tell HBA how to handle request */
645 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
646 sd_prot_op(SCpnt
, host_dif
);
649 * We shouldn't disconnect in the middle of a sector, so with a dumb
650 * host adapter, it's safe to assume that we can at least transfer
651 * this many bytes between each connect / disconnect.
653 SCpnt
->transfersize
= sdp
->sector_size
;
654 SCpnt
->underflow
= this_count
<< 9;
655 SCpnt
->allowed
= SD_MAX_RETRIES
;
658 * This indicates that the command is ready from our end to be
663 return scsi_prep_return(q
, rq
, ret
);
667 * sd_open - open a scsi disk device
668 * @inode: only i_rdev member may be used
669 * @filp: only f_mode and f_flags may be used
671 * Returns 0 if successful. Returns a negated errno value in case
674 * Note: This can be called from a user context (e.g. fsck(1) )
675 * or from within the kernel (e.g. as a result of a mount(1) ).
676 * In the latter case @inode and @filp carry an abridged amount
677 * of information as noted above.
679 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
681 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
682 struct scsi_device
*sdev
;
688 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
693 * If the device is in error recovery, wait until it is done.
694 * If the device is offline, then disallow any access to it.
697 if (!scsi_block_when_processing_errors(sdev
))
700 if (sdev
->removable
|| sdkp
->write_prot
)
701 check_disk_change(bdev
);
704 * If the drive is empty, just let the open fail.
707 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
711 * If the device has the write protect tab set, have the open fail
712 * if the user expects to be able to write to the thing.
715 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
719 * It is possible that the disk changing stuff resulted in
720 * the device being taken offline. If this is the case,
721 * report this to the user, and don't pretend that the
722 * open actually succeeded.
725 if (!scsi_device_online(sdev
))
728 if (!sdkp
->openers
++ && sdev
->removable
) {
729 if (scsi_block_when_processing_errors(sdev
))
730 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
741 * sd_release - invoked when the (last) close(2) is called on this
743 * @inode: only i_rdev member may be used
744 * @filp: only f_mode and f_flags may be used
748 * Note: may block (uninterruptible) if error recovery is underway
751 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
753 struct scsi_disk
*sdkp
= scsi_disk(disk
);
754 struct scsi_device
*sdev
= sdkp
->device
;
756 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
758 if (!--sdkp
->openers
&& sdev
->removable
) {
759 if (scsi_block_when_processing_errors(sdev
))
760 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
764 * XXX and what if there are packets in flight and this close()
765 * XXX is followed by a "rmmod sd_mod"?
771 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
773 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
774 struct scsi_device
*sdp
= sdkp
->device
;
775 struct Scsi_Host
*host
= sdp
->host
;
778 /* default to most commonly used values */
779 diskinfo
[0] = 0x40; /* 1 << 6 */
780 diskinfo
[1] = 0x20; /* 1 << 5 */
781 diskinfo
[2] = sdkp
->capacity
>> 11;
783 /* override with calculated, extended default, or driver values */
784 if (host
->hostt
->bios_param
)
785 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
787 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
789 geo
->heads
= diskinfo
[0];
790 geo
->sectors
= diskinfo
[1];
791 geo
->cylinders
= diskinfo
[2];
796 * sd_ioctl - process an ioctl
797 * @inode: only i_rdev/i_bdev members may be used
798 * @filp: only f_mode and f_flags may be used
799 * @cmd: ioctl command number
800 * @arg: this is third argument given to ioctl(2) system call.
801 * Often contains a pointer.
803 * Returns 0 if successful (some ioctls return postive numbers on
804 * success as well). Returns a negated errno value in case of error.
806 * Note: most ioctls are forward onto the block subsystem or further
807 * down in the scsi subsystem.
809 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
810 unsigned int cmd
, unsigned long arg
)
812 struct gendisk
*disk
= bdev
->bd_disk
;
813 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
814 void __user
*p
= (void __user
*)arg
;
817 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
818 disk
->disk_name
, cmd
));
821 * If we are in the middle of error recovery, don't let anyone
822 * else try and use this device. Also, if error recovery fails, it
823 * may try and take the device offline, in which case all further
824 * access to the device is prohibited.
826 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
827 (mode
& FMODE_NDELAY
) != 0);
828 if (!scsi_block_when_processing_errors(sdp
) || !error
)
832 * Send SCSI addressing ioctls directly to mid level, send other
833 * ioctls to block level and then onto mid level if they can't be
837 case SCSI_IOCTL_GET_IDLUN
:
838 case SCSI_IOCTL_GET_BUS_NUMBER
:
839 return scsi_ioctl(sdp
, cmd
, p
);
841 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
842 if (error
!= -ENOTTY
)
845 return scsi_ioctl(sdp
, cmd
, p
);
848 static void set_media_not_present(struct scsi_disk
*sdkp
)
850 sdkp
->media_present
= 0;
852 sdkp
->device
->changed
= 1;
856 * sd_media_changed - check if our medium changed
857 * @disk: kernel device descriptor
859 * Returns 0 if not applicable or no change; 1 if change
861 * Note: this function is invoked from the block subsystem.
863 static int sd_media_changed(struct gendisk
*disk
)
865 struct scsi_disk
*sdkp
= scsi_disk(disk
);
866 struct scsi_device
*sdp
= sdkp
->device
;
867 struct scsi_sense_hdr
*sshdr
= NULL
;
870 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
876 * If the device is offline, don't send any commands - just pretend as
877 * if the command failed. If the device ever comes back online, we
878 * can deal with it then. It is only because of unrecoverable errors
879 * that we would ever take a device offline in the first place.
881 if (!scsi_device_online(sdp
)) {
882 set_media_not_present(sdkp
);
888 * Using TEST_UNIT_READY enables differentiation between drive with
889 * no cartridge loaded - NOT READY, drive with changed cartridge -
890 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
892 * Drives that auto spin down. eg iomega jaz 1G, will be started
893 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
894 * sd_revalidate() is called.
898 if (scsi_block_when_processing_errors(sdp
)) {
899 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
900 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
905 * Unable to test, unit probably not ready. This usually
906 * means there is no disc in the drive. Mark as changed,
907 * and we will figure it out later once the drive is
910 if (retval
|| (scsi_sense_valid(sshdr
) &&
911 /* 0x3a is medium not present */
912 sshdr
->asc
== 0x3a)) {
913 set_media_not_present(sdkp
);
919 * For removable scsi disk we have to recognise the presence
920 * of a disk in the drive. This is kept in the struct scsi_disk
921 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
923 sdkp
->media_present
= 1;
925 retval
= sdp
->changed
;
928 if (retval
!= sdkp
->previous_state
)
929 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
930 sdkp
->previous_state
= retval
;
935 static int sd_sync_cache(struct scsi_disk
*sdkp
)
938 struct scsi_device
*sdp
= sdkp
->device
;
939 struct scsi_sense_hdr sshdr
;
941 if (!scsi_device_online(sdp
))
945 for (retries
= 3; retries
> 0; --retries
) {
946 unsigned char cmd
[10] = { 0 };
948 cmd
[0] = SYNCHRONIZE_CACHE
;
950 * Leave the rest of the command zero to indicate
953 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
954 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
960 sd_print_result(sdkp
, res
);
961 if (driver_byte(res
) & DRIVER_SENSE
)
962 sd_print_sense_hdr(sdkp
, &sshdr
);
970 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
972 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
973 rq
->timeout
= SD_TIMEOUT
;
974 rq
->retries
= SD_MAX_RETRIES
;
975 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
979 static void sd_rescan(struct device
*dev
)
981 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
984 revalidate_disk(sdkp
->disk
);
992 * This gets directly called from VFS. When the ioctl
993 * is not recognized we go back to the other translation paths.
995 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
996 unsigned int cmd
, unsigned long arg
)
998 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1001 * If we are in the middle of error recovery, don't let anyone
1002 * else try and use this device. Also, if error recovery fails, it
1003 * may try and take the device offline, in which case all further
1004 * access to the device is prohibited.
1006 if (!scsi_block_when_processing_errors(sdev
))
1009 if (sdev
->host
->hostt
->compat_ioctl
) {
1012 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1018 * Let the static ioctl translation table take care of it.
1020 return -ENOIOCTLCMD
;
1024 static const struct block_device_operations sd_fops
= {
1025 .owner
= THIS_MODULE
,
1027 .release
= sd_release
,
1028 .locked_ioctl
= sd_ioctl
,
1029 .getgeo
= sd_getgeo
,
1030 #ifdef CONFIG_COMPAT
1031 .compat_ioctl
= sd_compat_ioctl
,
1033 .media_changed
= sd_media_changed
,
1034 .revalidate_disk
= sd_revalidate_disk
,
1037 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1039 u64 start_lba
= blk_rq_pos(scmd
->request
);
1040 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1044 * resid is optional but mostly filled in. When it's unused,
1045 * its value is zero, so we assume the whole buffer transferred
1047 unsigned int transferred
= scsi_bufflen(scmd
) - scsi_get_resid(scmd
);
1048 unsigned int good_bytes
;
1050 if (!blk_fs_request(scmd
->request
))
1053 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1054 SCSI_SENSE_BUFFERSIZE
,
1059 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1062 if (scmd
->device
->sector_size
< 512) {
1063 /* only legitimate sector_size here is 256 */
1067 /* be careful ... don't want any overflows */
1068 u64 factor
= scmd
->device
->sector_size
/ 512;
1069 do_div(start_lba
, factor
);
1070 do_div(end_lba
, factor
);
1073 /* The bad lba was reported incorrectly, we have no idea where
1076 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1079 /* This computation should always be done in terms of
1080 * the resolution of the device's medium.
1082 good_bytes
= (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1083 return min(good_bytes
, transferred
);
1087 * sd_done - bottom half handler: called when the lower level
1088 * driver has completed (successfully or otherwise) a scsi command.
1089 * @SCpnt: mid-level's per command structure.
1091 * Note: potentially run from within an ISR. Must not block.
1093 static int sd_done(struct scsi_cmnd
*SCpnt
)
1095 int result
= SCpnt
->result
;
1096 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1097 struct scsi_sense_hdr sshdr
;
1098 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1099 int sense_valid
= 0;
1100 int sense_deferred
= 0;
1103 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1105 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1107 #ifdef CONFIG_SCSI_LOGGING
1108 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1110 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1111 "sd_done: sb[respc,sk,asc,"
1112 "ascq]=%x,%x,%x,%x\n",
1113 sshdr
.response_code
,
1114 sshdr
.sense_key
, sshdr
.asc
,
1118 if (driver_byte(result
) != DRIVER_SENSE
&&
1119 (!sense_valid
|| sense_deferred
))
1122 switch (sshdr
.sense_key
) {
1123 case HARDWARE_ERROR
:
1125 good_bytes
= sd_completed_bytes(SCpnt
);
1127 case RECOVERED_ERROR
:
1128 good_bytes
= scsi_bufflen(SCpnt
);
1131 /* This indicates a false check condition, so ignore it. An
1132 * unknown amount of data was transferred so treat it as an
1135 scsi_print_sense("sd", SCpnt
);
1137 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1139 case ABORTED_COMMAND
:
1140 if (sshdr
.asc
== 0x10) { /* DIF: Disk detected corruption */
1141 scsi_print_result(SCpnt
);
1142 scsi_print_sense("sd", SCpnt
);
1143 good_bytes
= sd_completed_bytes(SCpnt
);
1146 case ILLEGAL_REQUEST
:
1147 if (sshdr
.asc
== 0x10) { /* DIX: HBA detected corruption */
1148 scsi_print_result(SCpnt
);
1149 scsi_print_sense("sd", SCpnt
);
1150 good_bytes
= sd_completed_bytes(SCpnt
);
1157 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1158 sd_dif_complete(SCpnt
, good_bytes
);
1160 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1161 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
)
1162 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1167 static int media_not_present(struct scsi_disk
*sdkp
,
1168 struct scsi_sense_hdr
*sshdr
)
1171 if (!scsi_sense_valid(sshdr
))
1173 /* not invoked for commands that could return deferred errors */
1174 if (sshdr
->sense_key
!= NOT_READY
&&
1175 sshdr
->sense_key
!= UNIT_ATTENTION
)
1177 if (sshdr
->asc
!= 0x3A) /* medium not present */
1180 set_media_not_present(sdkp
);
1185 * spinup disk - called only in sd_revalidate_disk()
1188 sd_spinup_disk(struct scsi_disk
*sdkp
)
1190 unsigned char cmd
[10];
1191 unsigned long spintime_expire
= 0;
1192 int retries
, spintime
;
1193 unsigned int the_result
;
1194 struct scsi_sense_hdr sshdr
;
1195 int sense_valid
= 0;
1199 /* Spin up drives, as required. Only do this at boot time */
1200 /* Spinup needs to be done for module loads too. */
1205 cmd
[0] = TEST_UNIT_READY
;
1206 memset((void *) &cmd
[1], 0, 9);
1208 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1211 SD_MAX_RETRIES
, NULL
);
1214 * If the drive has indicated to us that it
1215 * doesn't have any media in it, don't bother
1216 * with any more polling.
1218 if (media_not_present(sdkp
, &sshdr
))
1222 sense_valid
= scsi_sense_valid(&sshdr
);
1224 } while (retries
< 3 &&
1225 (!scsi_status_is_good(the_result
) ||
1226 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1227 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1229 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1230 /* no sense, TUR either succeeded or failed
1231 * with a status error */
1232 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1233 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1234 sd_print_result(sdkp
, the_result
);
1240 * The device does not want the automatic start to be issued.
1242 if (sdkp
->device
->no_start_on_add
)
1245 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1246 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1247 break; /* manual intervention required */
1248 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1249 break; /* standby */
1250 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1251 break; /* unavailable */
1253 * Issue command to spin up drive when not ready
1256 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1257 cmd
[0] = START_STOP
;
1258 cmd
[1] = 1; /* Return immediately */
1259 memset((void *) &cmd
[2], 0, 8);
1260 cmd
[4] = 1; /* Start spin cycle */
1261 if (sdkp
->device
->start_stop_pwr_cond
)
1263 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1265 SD_TIMEOUT
, SD_MAX_RETRIES
,
1267 spintime_expire
= jiffies
+ 100 * HZ
;
1270 /* Wait 1 second for next try */
1275 * Wait for USB flash devices with slow firmware.
1276 * Yes, this sense key/ASC combination shouldn't
1277 * occur here. It's characteristic of these devices.
1279 } else if (sense_valid
&&
1280 sshdr
.sense_key
== UNIT_ATTENTION
&&
1281 sshdr
.asc
== 0x28) {
1283 spintime_expire
= jiffies
+ 5 * HZ
;
1286 /* Wait 1 second for next try */
1289 /* we don't understand the sense code, so it's
1290 * probably pointless to loop */
1292 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1293 sd_print_sense_hdr(sdkp
, &sshdr
);
1298 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1301 if (scsi_status_is_good(the_result
))
1304 printk("not responding...\n");
1310 * Determine whether disk supports Data Integrity Field.
1312 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1314 struct scsi_device
*sdp
= sdkp
->device
;
1317 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1320 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1322 if (type
== sdkp
->protection_type
|| !sdkp
->first_scan
)
1325 sdkp
->protection_type
= type
;
1327 if (type
> SD_DIF_TYPE3_PROTECTION
) {
1328 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported " \
1329 "protection type %u. Disabling disk!\n", type
);
1334 if (scsi_host_dif_capable(sdp
->host
, type
))
1335 sd_printk(KERN_NOTICE
, sdkp
,
1336 "Enabling DIF Type %u protection\n", type
);
1338 sd_printk(KERN_NOTICE
, sdkp
,
1339 "Disabling DIF Type %u protection\n", type
);
1342 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1343 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1346 sd_print_result(sdkp
, the_result
);
1347 if (driver_byte(the_result
) & DRIVER_SENSE
)
1348 sd_print_sense_hdr(sdkp
, sshdr
);
1350 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1353 * Set dirty bit for removable devices if not ready -
1354 * sometimes drives will not report this properly.
1356 if (sdp
->removable
&&
1357 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1361 * We used to set media_present to 0 here to indicate no media
1362 * in the drive, but some drives fail read capacity even with
1363 * media present, so we can't do that.
1365 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1369 #if RC16_LEN > SD_BUF_SIZE
1370 #error RC16_LEN must not be more than SD_BUF_SIZE
1373 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1374 unsigned char *buffer
)
1376 unsigned char cmd
[16];
1377 struct scsi_sense_hdr sshdr
;
1378 int sense_valid
= 0;
1381 unsigned int alignment
;
1382 unsigned long long lba
;
1383 unsigned sector_size
;
1387 cmd
[0] = SERVICE_ACTION_IN
;
1388 cmd
[1] = SAI_READ_CAPACITY_16
;
1390 memset(buffer
, 0, RC16_LEN
);
1392 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1393 buffer
, RC16_LEN
, &sshdr
,
1394 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1396 if (media_not_present(sdkp
, &sshdr
))
1400 sense_valid
= scsi_sense_valid(&sshdr
);
1402 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1403 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1405 /* Invalid Command Operation Code or
1406 * Invalid Field in CDB, just retry
1407 * silently with RC10 */
1412 } while (the_result
&& retries
);
1415 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1416 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1420 sector_size
= get_unaligned_be32(&buffer
[8]);
1421 lba
= get_unaligned_be64(&buffer
[0]);
1423 sd_read_protection_type(sdkp
, buffer
);
1425 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1426 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1427 "kernel compiled with support for large block "
1433 /* Logical blocks per physical block exponent */
1434 sdkp
->hw_sector_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1436 /* Lowest aligned logical block */
1437 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1438 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1439 if (alignment
&& sdkp
->first_scan
)
1440 sd_printk(KERN_NOTICE
, sdkp
,
1441 "physical block alignment offset: %u\n", alignment
);
1443 sdkp
->capacity
= lba
+ 1;
1447 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1448 unsigned char *buffer
)
1450 unsigned char cmd
[16];
1451 struct scsi_sense_hdr sshdr
;
1452 int sense_valid
= 0;
1456 unsigned sector_size
;
1459 cmd
[0] = READ_CAPACITY
;
1460 memset(&cmd
[1], 0, 9);
1461 memset(buffer
, 0, 8);
1463 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1465 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1467 if (media_not_present(sdkp
, &sshdr
))
1471 sense_valid
= scsi_sense_valid(&sshdr
);
1474 } while (the_result
&& retries
);
1477 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1478 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1482 sector_size
= get_unaligned_be32(&buffer
[4]);
1483 lba
= get_unaligned_be32(&buffer
[0]);
1485 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1486 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1487 "kernel compiled with support for large block "
1493 sdkp
->capacity
= lba
+ 1;
1494 sdkp
->hw_sector_size
= sector_size
;
1498 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1500 if (sdp
->scsi_level
> SCSI_SPC_2
)
1502 if (scsi_device_protection(sdp
))
1508 * read disk capacity
1511 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1514 struct scsi_device
*sdp
= sdkp
->device
;
1515 sector_t old_capacity
= sdkp
->capacity
;
1517 if (sd_try_rc16_first(sdp
)) {
1518 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1519 if (sector_size
== -EOVERFLOW
)
1521 if (sector_size
== -ENODEV
)
1523 if (sector_size
< 0)
1524 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1525 if (sector_size
< 0)
1528 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1529 if (sector_size
== -EOVERFLOW
)
1531 if (sector_size
< 0)
1533 if ((sizeof(sdkp
->capacity
) > 4) &&
1534 (sdkp
->capacity
> 0xffffffffULL
)) {
1535 int old_sector_size
= sector_size
;
1536 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1537 "Trying to use READ CAPACITY(16).\n");
1538 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1539 if (sector_size
< 0) {
1540 sd_printk(KERN_NOTICE
, sdkp
,
1541 "Using 0xffffffff as device size\n");
1542 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1543 sector_size
= old_sector_size
;
1549 /* Some devices are known to return the total number of blocks,
1550 * not the highest block number. Some devices have versions
1551 * which do this and others which do not. Some devices we might
1552 * suspect of doing this but we don't know for certain.
1554 * If we know the reported capacity is wrong, decrement it. If
1555 * we can only guess, then assume the number of blocks is even
1556 * (usually true but not always) and err on the side of lowering
1559 if (sdp
->fix_capacity
||
1560 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1561 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1562 "from its reported value: %llu\n",
1563 (unsigned long long) sdkp
->capacity
);
1568 if (sector_size
== 0) {
1570 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1574 if (sector_size
!= 512 &&
1575 sector_size
!= 1024 &&
1576 sector_size
!= 2048 &&
1577 sector_size
!= 4096 &&
1578 sector_size
!= 256) {
1579 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1582 * The user might want to re-format the drive with
1583 * a supported sectorsize. Once this happens, it
1584 * would be relatively trivial to set the thing up.
1585 * For this reason, we leave the thing in the table.
1589 * set a bogus sector size so the normal read/write
1590 * logic in the block layer will eventually refuse any
1591 * request on this device without tripping over power
1592 * of two sector size assumptions
1596 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
1599 char cap_str_2
[10], cap_str_10
[10];
1600 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1602 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1604 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1605 sizeof(cap_str_10
));
1607 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
1608 sd_printk(KERN_NOTICE
, sdkp
,
1609 "%llu %d-byte logical blocks: (%s/%s)\n",
1610 (unsigned long long)sdkp
->capacity
,
1611 sector_size
, cap_str_10
, cap_str_2
);
1613 if (sdkp
->hw_sector_size
!= sector_size
)
1614 sd_printk(KERN_NOTICE
, sdkp
,
1615 "%u-byte physical blocks\n",
1616 sdkp
->hw_sector_size
);
1620 /* Rescale capacity to 512-byte units */
1621 if (sector_size
== 4096)
1622 sdkp
->capacity
<<= 3;
1623 else if (sector_size
== 2048)
1624 sdkp
->capacity
<<= 2;
1625 else if (sector_size
== 1024)
1626 sdkp
->capacity
<<= 1;
1627 else if (sector_size
== 256)
1628 sdkp
->capacity
>>= 1;
1630 blk_queue_physical_block_size(sdp
->request_queue
, sdkp
->hw_sector_size
);
1631 sdkp
->device
->sector_size
= sector_size
;
1634 /* called with buffer of length 512 */
1636 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1637 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1638 struct scsi_sense_hdr
*sshdr
)
1640 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1641 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1646 * read write protect setting, if possible - called only in sd_revalidate_disk()
1647 * called with buffer of length SD_BUF_SIZE
1650 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1653 struct scsi_device
*sdp
= sdkp
->device
;
1654 struct scsi_mode_data data
;
1655 int old_wp
= sdkp
->write_prot
;
1657 set_disk_ro(sdkp
->disk
, 0);
1658 if (sdp
->skip_ms_page_3f
) {
1659 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1663 if (sdp
->use_192_bytes_for_3f
) {
1664 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1667 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1668 * We have to start carefully: some devices hang if we ask
1669 * for more than is available.
1671 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1674 * Second attempt: ask for page 0 When only page 0 is
1675 * implemented, a request for page 3F may return Sense Key
1676 * 5: Illegal Request, Sense Code 24: Invalid field in
1679 if (!scsi_status_is_good(res
))
1680 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1683 * Third attempt: ask 255 bytes, as we did earlier.
1685 if (!scsi_status_is_good(res
))
1686 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1690 if (!scsi_status_is_good(res
)) {
1691 sd_printk(KERN_WARNING
, sdkp
,
1692 "Test WP failed, assume Write Enabled\n");
1694 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1695 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1696 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
1697 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1698 sdkp
->write_prot
? "on" : "off");
1699 sd_printk(KERN_DEBUG
, sdkp
,
1700 "Mode Sense: %02x %02x %02x %02x\n",
1701 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1707 * sd_read_cache_type - called only from sd_revalidate_disk()
1708 * called with buffer of length SD_BUF_SIZE
1711 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1714 struct scsi_device
*sdp
= sdkp
->device
;
1718 struct scsi_mode_data data
;
1719 struct scsi_sense_hdr sshdr
;
1720 int old_wce
= sdkp
->WCE
;
1721 int old_rcd
= sdkp
->RCD
;
1722 int old_dpofua
= sdkp
->DPOFUA
;
1724 if (sdp
->skip_ms_page_8
)
1727 if (sdp
->type
== TYPE_RBC
) {
1735 /* cautiously ask */
1736 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1738 if (!scsi_status_is_good(res
))
1741 if (!data
.header_length
) {
1743 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1746 /* that went OK, now ask for the proper length */
1750 * We're only interested in the first three bytes, actually.
1751 * But the data cache page is defined for the first 20.
1758 /* Take headers and block descriptors into account */
1759 len
+= data
.header_length
+ data
.block_descriptor_length
;
1760 if (len
> SD_BUF_SIZE
)
1764 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1766 if (scsi_status_is_good(res
)) {
1767 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1769 if (offset
>= SD_BUF_SIZE
- 2) {
1770 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1774 if ((buffer
[offset
] & 0x3f) != modepage
) {
1775 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1779 if (modepage
== 8) {
1780 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1781 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1783 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1787 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1788 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1789 sd_printk(KERN_NOTICE
, sdkp
,
1790 "Uses READ/WRITE(6), disabling FUA\n");
1794 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
1795 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
1796 sd_printk(KERN_NOTICE
, sdkp
,
1797 "Write cache: %s, read cache: %s, %s\n",
1798 sdkp
->WCE
? "enabled" : "disabled",
1799 sdkp
->RCD
? "disabled" : "enabled",
1800 sdkp
->DPOFUA
? "supports DPO and FUA"
1801 : "doesn't support DPO or FUA");
1807 if (scsi_sense_valid(&sshdr
) &&
1808 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1809 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1810 /* Invalid field in CDB */
1811 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1813 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1816 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1823 * The ATO bit indicates whether the DIF application tag is available
1824 * for use by the operating system.
1826 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1829 struct scsi_device
*sdp
= sdkp
->device
;
1830 struct scsi_mode_data data
;
1831 struct scsi_sense_hdr sshdr
;
1833 if (sdp
->type
!= TYPE_DISK
)
1836 if (sdkp
->protection_type
== 0)
1839 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1840 SD_MAX_RETRIES
, &data
, &sshdr
);
1842 if (!scsi_status_is_good(res
) || !data
.header_length
||
1844 sd_printk(KERN_WARNING
, sdkp
,
1845 "getting Control mode page failed, assume no ATO\n");
1847 if (scsi_sense_valid(&sshdr
))
1848 sd_print_sense_hdr(sdkp
, &sshdr
);
1853 offset
= data
.header_length
+ data
.block_descriptor_length
;
1855 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1856 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1860 if ((buffer
[offset
+ 5] & 0x80) == 0)
1869 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1870 * @disk: disk to query
1872 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
1874 unsigned int sector_sz
= sdkp
->device
->sector_size
;
1877 /* Block Limits VPD */
1878 buffer
= scsi_get_vpd_page(sdkp
->device
, 0xb0);
1883 blk_queue_io_min(sdkp
->disk
->queue
,
1884 get_unaligned_be16(&buffer
[6]) * sector_sz
);
1885 blk_queue_io_opt(sdkp
->disk
->queue
,
1886 get_unaligned_be32(&buffer
[12]) * sector_sz
);
1892 * sd_read_block_characteristics - Query block dev. characteristics
1893 * @disk: disk to query
1895 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
1900 /* Block Device Characteristics VPD */
1901 buffer
= scsi_get_vpd_page(sdkp
->device
, 0xb1);
1906 rot
= get_unaligned_be16(&buffer
[4]);
1909 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
1914 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
1917 * Although VPD inquiries can go to SCSI-2 type devices,
1918 * some USB ones crash on receiving them, and the pages
1919 * we currently ask for are for SPC-3 and beyond
1921 if (sdp
->scsi_level
> SCSI_SPC_2
)
1927 * sd_revalidate_disk - called the first time a new disk is seen,
1928 * performs disk spin up, read_capacity, etc.
1929 * @disk: struct gendisk we care about
1931 static int sd_revalidate_disk(struct gendisk
*disk
)
1933 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1934 struct scsi_device
*sdp
= sdkp
->device
;
1935 unsigned char *buffer
;
1938 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1939 "sd_revalidate_disk\n"));
1942 * If the device is offline, don't try and read capacity or any
1943 * of the other niceties.
1945 if (!scsi_device_online(sdp
))
1948 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1950 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1951 "allocation failure.\n");
1955 sd_spinup_disk(sdkp
);
1958 * Without media there is no reason to ask; moreover, some devices
1959 * react badly if we do.
1961 if (sdkp
->media_present
) {
1962 sd_read_capacity(sdkp
, buffer
);
1964 if (sd_try_extended_inquiry(sdp
)) {
1965 sd_read_block_limits(sdkp
);
1966 sd_read_block_characteristics(sdkp
);
1969 sd_read_write_protect_flag(sdkp
, buffer
);
1970 sd_read_cache_type(sdkp
, buffer
);
1971 sd_read_app_tag_own(sdkp
, buffer
);
1974 sdkp
->first_scan
= 0;
1977 * We now have all cache related info, determine how we deal
1978 * with ordered requests. Note that as the current SCSI
1979 * dispatch function can alter request order, we cannot use
1980 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1983 ordered
= sdkp
->DPOFUA
1984 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1986 ordered
= QUEUE_ORDERED_DRAIN
;
1988 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1990 set_capacity(disk
, sdkp
->capacity
);
1998 * sd_format_disk_name - format disk name
1999 * @prefix: name prefix - ie. "sd" for SCSI disks
2000 * @index: index of the disk to format name for
2001 * @buf: output buffer
2002 * @buflen: length of the output buffer
2004 * SCSI disk names starts at sda. The 26th device is sdz and the
2005 * 27th is sdaa. The last one for two lettered suffix is sdzz
2006 * which is followed by sdaaa.
2008 * This is basically 26 base counting with one extra 'nil' entry
2009 * at the beggining from the second digit on and can be
2010 * determined using similar method as 26 base conversion with the
2011 * index shifted -1 after each digit is computed.
2017 * 0 on success, -errno on failure.
2019 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2021 const int base
= 'z' - 'a' + 1;
2022 char *begin
= buf
+ strlen(prefix
);
2023 char *end
= buf
+ buflen
;
2033 *--p
= 'a' + (index
% unit
);
2034 index
= (index
/ unit
) - 1;
2035 } while (index
>= 0);
2037 memmove(begin
, p
, end
- p
);
2038 memcpy(buf
, prefix
, strlen(prefix
));
2044 * The asynchronous part of sd_probe
2046 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2048 struct scsi_disk
*sdkp
= data
;
2049 struct scsi_device
*sdp
;
2056 index
= sdkp
->index
;
2057 dev
= &sdp
->sdev_gendev
;
2059 gd
->major
= sd_major((index
& 0xf0) >> 4);
2060 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2061 gd
->minors
= SD_MINORS
;
2063 gd
->fops
= &sd_fops
;
2064 gd
->private_data
= &sdkp
->driver
;
2065 gd
->queue
= sdkp
->device
->request_queue
;
2067 /* defaults, until the device tells us otherwise */
2068 sdp
->sector_size
= 512;
2070 sdkp
->media_present
= 1;
2071 sdkp
->write_prot
= 0;
2075 sdkp
->first_scan
= 1;
2077 sd_revalidate_disk(gd
);
2079 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2081 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2082 gd
->flags
= GENHD_FL_EXT_DEVT
| GENHD_FL_DRIVERFS
;
2084 gd
->flags
|= GENHD_FL_REMOVABLE
;
2086 dev_set_drvdata(dev
, sdkp
);
2088 sd_dif_config_host(sdkp
);
2090 sd_revalidate_disk(gd
);
2092 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2093 sdp
->removable
? "removable " : "");
2094 put_device(&sdkp
->dev
);
2098 * sd_probe - called during driver initialization and whenever a
2099 * new scsi device is attached to the system. It is called once
2100 * for each scsi device (not just disks) present.
2101 * @dev: pointer to device object
2103 * Returns 0 if successful (or not interested in this scsi device
2104 * (e.g. scanner)); 1 when there is an error.
2106 * Note: this function is invoked from the scsi mid-level.
2107 * This function sets up the mapping between a given
2108 * <host,channel,id,lun> (found in sdp) and new device name
2109 * (e.g. /dev/sda). More precisely it is the block device major
2110 * and minor number that is chosen here.
2112 * Assume sd_attach is not re-entrant (for time being)
2113 * Also think about sd_attach() and sd_remove() running coincidentally.
2115 static int sd_probe(struct device
*dev
)
2117 struct scsi_device
*sdp
= to_scsi_device(dev
);
2118 struct scsi_disk
*sdkp
;
2124 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2127 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2131 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2135 gd
= alloc_disk(SD_MINORS
);
2140 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2143 spin_lock(&sd_index_lock
);
2144 error
= ida_get_new(&sd_index_ida
, &index
);
2145 spin_unlock(&sd_index_lock
);
2146 } while (error
== -EAGAIN
);
2151 if (index
>= SD_MAX_DISKS
) {
2153 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name space exhausted.\n");
2154 goto out_free_index
;
2157 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2159 goto out_free_index
;
2162 sdkp
->driver
= &sd_template
;
2164 sdkp
->index
= index
;
2166 sdkp
->previous_state
= 1;
2168 if (!sdp
->request_queue
->rq_timeout
) {
2169 if (sdp
->type
!= TYPE_MOD
)
2170 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2172 blk_queue_rq_timeout(sdp
->request_queue
,
2176 device_initialize(&sdkp
->dev
);
2177 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
2178 sdkp
->dev
.class = &sd_disk_class
;
2179 dev_set_name(&sdkp
->dev
, dev_name(&sdp
->sdev_gendev
));
2181 if (device_add(&sdkp
->dev
))
2182 goto out_free_index
;
2184 get_device(&sdp
->sdev_gendev
);
2186 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2187 async_schedule(sd_probe_async
, sdkp
);
2192 spin_lock(&sd_index_lock
);
2193 ida_remove(&sd_index_ida
, index
);
2194 spin_unlock(&sd_index_lock
);
2204 * sd_remove - called whenever a scsi disk (previously recognized by
2205 * sd_probe) is detached from the system. It is called (potentially
2206 * multiple times) during sd module unload.
2207 * @sdp: pointer to mid level scsi device object
2209 * Note: this function is invoked from the scsi mid-level.
2210 * This function potentially frees up a device name (e.g. /dev/sdc)
2211 * that could be re-used by a subsequent sd_probe().
2212 * This function is not called when the built-in sd driver is "exit-ed".
2214 static int sd_remove(struct device
*dev
)
2216 struct scsi_disk
*sdkp
;
2218 async_synchronize_full();
2219 sdkp
= dev_get_drvdata(dev
);
2220 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2221 device_del(&sdkp
->dev
);
2222 del_gendisk(sdkp
->disk
);
2225 mutex_lock(&sd_ref_mutex
);
2226 dev_set_drvdata(dev
, NULL
);
2227 put_device(&sdkp
->dev
);
2228 mutex_unlock(&sd_ref_mutex
);
2234 * scsi_disk_release - Called to free the scsi_disk structure
2235 * @dev: pointer to embedded class device
2237 * sd_ref_mutex must be held entering this routine. Because it is
2238 * called on last put, you should always use the scsi_disk_get()
2239 * scsi_disk_put() helpers which manipulate the semaphore directly
2240 * and never do a direct put_device.
2242 static void scsi_disk_release(struct device
*dev
)
2244 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2245 struct gendisk
*disk
= sdkp
->disk
;
2247 spin_lock(&sd_index_lock
);
2248 ida_remove(&sd_index_ida
, sdkp
->index
);
2249 spin_unlock(&sd_index_lock
);
2251 disk
->private_data
= NULL
;
2253 put_device(&sdkp
->device
->sdev_gendev
);
2258 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2260 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2261 struct scsi_sense_hdr sshdr
;
2262 struct scsi_device
*sdp
= sdkp
->device
;
2266 cmd
[4] |= 1; /* START */
2268 if (sdp
->start_stop_pwr_cond
)
2269 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2271 if (!scsi_device_online(sdp
))
2274 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2275 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2277 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2278 sd_print_result(sdkp
, res
);
2279 if (driver_byte(res
) & DRIVER_SENSE
)
2280 sd_print_sense_hdr(sdkp
, &sshdr
);
2287 * Send a SYNCHRONIZE CACHE instruction down to the device through
2288 * the normal SCSI command structure. Wait for the command to
2291 static void sd_shutdown(struct device
*dev
)
2293 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2296 return; /* this can happen */
2299 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2300 sd_sync_cache(sdkp
);
2303 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2304 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2305 sd_start_stop_device(sdkp
, 0);
2308 scsi_disk_put(sdkp
);
2311 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2313 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2317 return 0; /* this can happen */
2320 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2321 ret
= sd_sync_cache(sdkp
);
2326 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2327 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2328 ret
= sd_start_stop_device(sdkp
, 0);
2332 scsi_disk_put(sdkp
);
2336 static int sd_resume(struct device
*dev
)
2338 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2341 if (!sdkp
->device
->manage_start_stop
)
2344 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2345 ret
= sd_start_stop_device(sdkp
, 1);
2348 scsi_disk_put(sdkp
);
2353 * init_sd - entry point for this driver (both when built in or when
2356 * Note: this function registers this driver with the scsi mid-level.
2358 static int __init
init_sd(void)
2360 int majors
= 0, i
, err
;
2362 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2364 for (i
= 0; i
< SD_MAJORS
; i
++)
2365 if (register_blkdev(sd_major(i
), "sd") == 0)
2371 err
= class_register(&sd_disk_class
);
2375 err
= scsi_register_driver(&sd_template
.gendrv
);
2379 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2381 if (!sd_cdb_cache
) {
2382 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2386 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2388 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2395 kmem_cache_destroy(sd_cdb_cache
);
2398 class_unregister(&sd_disk_class
);
2400 for (i
= 0; i
< SD_MAJORS
; i
++)
2401 unregister_blkdev(sd_major(i
), "sd");
2406 * exit_sd - exit point for this driver (when it is a module).
2408 * Note: this function unregisters this driver from the scsi mid-level.
2410 static void __exit
exit_sd(void)
2414 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2416 mempool_destroy(sd_cdb_pool
);
2417 kmem_cache_destroy(sd_cdb_cache
);
2419 scsi_unregister_driver(&sd_template
.gendrv
);
2420 class_unregister(&sd_disk_class
);
2422 for (i
= 0; i
< SD_MAJORS
; i
++)
2423 unregister_blkdev(sd_major(i
), "sd");
2426 module_init(init_sd
);
2427 module_exit(exit_sd
);
2429 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2430 struct scsi_sense_hdr
*sshdr
)
2432 sd_printk(KERN_INFO
, sdkp
, "");
2433 scsi_show_sense_hdr(sshdr
);
2434 sd_printk(KERN_INFO
, sdkp
, "");
2435 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2438 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2440 sd_printk(KERN_INFO
, sdkp
, "");
2441 scsi_show_result(result
);