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 <asm/uaccess.h>
53 #include <scsi/scsi.h>
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_eh.h>
59 #include <scsi/scsi_host.h>
60 #include <scsi/scsi_ioctl.h>
61 #include <scsi/scsicam.h>
64 #include "scsi_logging.h"
66 MODULE_AUTHOR("Eric Youngdale");
67 MODULE_DESCRIPTION("SCSI disk (sd) driver");
68 MODULE_LICENSE("GPL");
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
90 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 static int sd_revalidate_disk(struct gendisk
*);
97 static int sd_probe(struct device
*);
98 static int sd_remove(struct device
*);
99 static void sd_shutdown(struct device
*);
100 static int sd_suspend(struct device
*, pm_message_t state
);
101 static int sd_resume(struct device
*);
102 static void sd_rescan(struct device
*);
103 static int sd_done(struct scsi_cmnd
*);
104 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
105 static void scsi_disk_release(struct device
*cdev
);
106 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
107 static void sd_print_result(struct scsi_disk
*, int);
109 static DEFINE_IDA(sd_index_ida
);
111 /* This semaphore is used to mediate the 0->1 reference get in the
112 * face of object destruction (i.e. we can't allow a get on an
113 * object after last put) */
114 static DEFINE_MUTEX(sd_ref_mutex
);
116 static const char *sd_cache_types
[] = {
117 "write through", "none", "write back",
118 "write back, no read (daft)"
122 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
123 const char *buf
, size_t count
)
125 int i
, ct
= -1, rcd
, wce
, sp
;
126 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
127 struct scsi_device
*sdp
= sdkp
->device
;
130 struct scsi_mode_data data
;
131 struct scsi_sense_hdr sshdr
;
134 if (sdp
->type
!= TYPE_DISK
)
135 /* no cache control on RBC devices; theoretically they
136 * can do it, but there's probably so many exceptions
137 * it's not worth the risk */
140 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
141 const int len
= strlen(sd_cache_types
[i
]);
142 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
150 rcd
= ct
& 0x01 ? 1 : 0;
151 wce
= ct
& 0x02 ? 1 : 0;
152 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
153 SD_MAX_RETRIES
, &data
, NULL
))
155 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
156 data
.block_descriptor_length
);
157 buffer_data
= buffer
+ data
.header_length
+
158 data
.block_descriptor_length
;
159 buffer_data
[2] &= ~0x05;
160 buffer_data
[2] |= wce
<< 2 | rcd
;
161 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
163 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
164 SD_MAX_RETRIES
, &data
, &sshdr
)) {
165 if (scsi_sense_valid(&sshdr
))
166 sd_print_sense_hdr(sdkp
, &sshdr
);
169 revalidate_disk(sdkp
->disk
);
174 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
175 const char *buf
, size_t count
)
177 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
178 struct scsi_device
*sdp
= sdkp
->device
;
180 if (!capable(CAP_SYS_ADMIN
))
183 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
189 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
190 const char *buf
, size_t count
)
192 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
193 struct scsi_device
*sdp
= sdkp
->device
;
195 if (!capable(CAP_SYS_ADMIN
))
198 if (sdp
->type
!= TYPE_DISK
)
201 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
207 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
210 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
211 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
213 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
217 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
219 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
221 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
225 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
228 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
229 struct scsi_device
*sdp
= sdkp
->device
;
231 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
235 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
238 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
240 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
244 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
247 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
249 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
253 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
256 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
258 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
261 static struct device_attribute sd_disk_attrs
[] = {
262 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
263 sd_store_cache_type
),
264 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
265 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
266 sd_store_allow_restart
),
267 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
268 sd_store_manage_start_stop
),
269 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
270 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
274 static struct class sd_disk_class
= {
276 .owner
= THIS_MODULE
,
277 .dev_release
= scsi_disk_release
,
278 .dev_attrs
= sd_disk_attrs
,
281 static struct scsi_driver sd_template
= {
282 .owner
= THIS_MODULE
,
287 .suspend
= sd_suspend
,
289 .shutdown
= sd_shutdown
,
296 * Device no to disk mapping:
298 * major disc2 disc p1
299 * |............|.............|....|....| <- dev_t
302 * Inside a major, we have 16k disks, however mapped non-
303 * contiguously. The first 16 disks are for major0, the next
304 * ones with major1, ... Disk 256 is for major0 again, disk 272
306 * As we stay compatible with our numbering scheme, we can reuse
307 * the well-know SCSI majors 8, 65--71, 136--143.
309 static int sd_major(int major_idx
)
313 return SCSI_DISK0_MAJOR
;
315 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
317 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
320 return 0; /* shut up gcc */
324 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
326 struct scsi_disk
*sdkp
= NULL
;
328 if (disk
->private_data
) {
329 sdkp
= scsi_disk(disk
);
330 if (scsi_device_get(sdkp
->device
) == 0)
331 get_device(&sdkp
->dev
);
338 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
340 struct scsi_disk
*sdkp
;
342 mutex_lock(&sd_ref_mutex
);
343 sdkp
= __scsi_disk_get(disk
);
344 mutex_unlock(&sd_ref_mutex
);
348 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
350 struct scsi_disk
*sdkp
;
352 mutex_lock(&sd_ref_mutex
);
353 sdkp
= dev_get_drvdata(dev
);
355 sdkp
= __scsi_disk_get(sdkp
->disk
);
356 mutex_unlock(&sd_ref_mutex
);
360 static void scsi_disk_put(struct scsi_disk
*sdkp
)
362 struct scsi_device
*sdev
= sdkp
->device
;
364 mutex_lock(&sd_ref_mutex
);
365 put_device(&sdkp
->dev
);
366 scsi_device_put(sdev
);
367 mutex_unlock(&sd_ref_mutex
);
371 * sd_init_command - build a scsi (read or write) command from
372 * information in the request structure.
373 * @SCpnt: pointer to mid-level's per scsi command structure that
374 * contains request and into which the scsi command is written
376 * Returns 1 if successful and 0 if error (or cannot be done now).
378 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
380 struct scsi_cmnd
*SCpnt
;
381 struct scsi_device
*sdp
= q
->queuedata
;
382 struct gendisk
*disk
= rq
->rq_disk
;
383 struct scsi_disk
*sdkp
;
384 sector_t block
= rq
->sector
;
386 unsigned int this_count
= rq
->nr_sectors
;
389 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
390 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
392 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
396 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
397 if (ret
!= BLKPREP_OK
)
400 sdkp
= scsi_disk(disk
);
402 /* from here on until we're complete, any goto out
403 * is used for a killable error condition */
406 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
407 "sd_init_command: block=%llu, "
409 (unsigned long long)block
,
412 if (!sdp
|| !scsi_device_online(sdp
) ||
413 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
414 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
415 "Finishing %ld sectors\n",
417 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
418 "Retry with 0x%p\n", SCpnt
));
424 * quietly refuse to do anything to a changed disc until
425 * the changed bit has been reset
427 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
432 * Some SD card readers can't handle multi-sector accesses which touch
433 * the last one or two hardware sectors. Split accesses as needed.
435 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
436 (sdp
->sector_size
/ 512);
438 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
439 if (block
< threshold
) {
440 /* Access up to the threshold but not beyond */
441 this_count
= threshold
- block
;
443 /* Access only a single hardware sector */
444 this_count
= sdp
->sector_size
/ 512;
448 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
449 (unsigned long long)block
));
452 * If we have a 1K hardware sectorsize, prevent access to single
453 * 512 byte sectors. In theory we could handle this - in fact
454 * the scsi cdrom driver must be able to handle this because
455 * we typically use 1K blocksizes, and cdroms typically have
456 * 2K hardware sectorsizes. Of course, things are simpler
457 * with the cdrom, since it is read-only. For performance
458 * reasons, the filesystems should be able to handle this
459 * and not force the scsi disk driver to use bounce buffers
462 if (sdp
->sector_size
== 1024) {
463 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
464 scmd_printk(KERN_ERR
, SCpnt
,
465 "Bad block number requested\n");
469 this_count
= this_count
>> 1;
472 if (sdp
->sector_size
== 2048) {
473 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
474 scmd_printk(KERN_ERR
, SCpnt
,
475 "Bad block number requested\n");
479 this_count
= this_count
>> 2;
482 if (sdp
->sector_size
== 4096) {
483 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
484 scmd_printk(KERN_ERR
, SCpnt
,
485 "Bad block number requested\n");
489 this_count
= this_count
>> 3;
492 if (rq_data_dir(rq
) == WRITE
) {
493 if (!sdp
->writeable
) {
496 SCpnt
->cmnd
[0] = WRITE_6
;
497 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
499 if (blk_integrity_rq(rq
) &&
500 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
503 } else if (rq_data_dir(rq
) == READ
) {
504 SCpnt
->cmnd
[0] = READ_6
;
505 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
507 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
511 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
512 "%s %d/%ld 512 byte blocks.\n",
513 (rq_data_dir(rq
) == WRITE
) ?
514 "writing" : "reading", this_count
,
517 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
518 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
520 SCpnt
->cmnd
[1] = 1 << 5;
524 if (block
> 0xffffffff) {
525 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
526 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
527 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
528 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
529 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
530 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
531 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
532 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
533 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
534 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
535 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
536 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
537 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
538 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
539 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
540 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
541 scsi_device_protection(SCpnt
->device
) ||
542 SCpnt
->device
->use_10_for_rw
) {
543 if (this_count
> 0xffff)
546 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
547 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
548 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
549 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
550 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
551 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
552 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
553 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
554 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
556 if (unlikely(blk_fua_rq(rq
))) {
558 * This happens only if this drive failed
559 * 10byte rw command with ILLEGAL_REQUEST
560 * during operation and thus turned off
563 scmd_printk(KERN_ERR
, SCpnt
,
564 "FUA write on READ/WRITE(6) drive\n");
568 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
569 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
570 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
571 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
574 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
576 /* If DIF or DIX is enabled, tell HBA how to handle request */
577 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
578 sd_dif_op(SCpnt
, host_dif
, scsi_prot_sg_count(SCpnt
),
579 sdkp
->protection_type
);
582 * We shouldn't disconnect in the middle of a sector, so with a dumb
583 * host adapter, it's safe to assume that we can at least transfer
584 * this many bytes between each connect / disconnect.
586 SCpnt
->transfersize
= sdp
->sector_size
;
587 SCpnt
->underflow
= this_count
<< 9;
588 SCpnt
->allowed
= SD_MAX_RETRIES
;
591 * This indicates that the command is ready from our end to be
596 return scsi_prep_return(q
, rq
, ret
);
600 * sd_open - open a scsi disk device
601 * @inode: only i_rdev member may be used
602 * @filp: only f_mode and f_flags may be used
604 * Returns 0 if successful. Returns a negated errno value in case
607 * Note: This can be called from a user context (e.g. fsck(1) )
608 * or from within the kernel (e.g. as a result of a mount(1) ).
609 * In the latter case @inode and @filp carry an abridged amount
610 * of information as noted above.
612 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
614 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
615 struct scsi_device
*sdev
;
621 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
626 * If the device is in error recovery, wait until it is done.
627 * If the device is offline, then disallow any access to it.
630 if (!scsi_block_when_processing_errors(sdev
))
633 if (sdev
->removable
|| sdkp
->write_prot
)
634 check_disk_change(bdev
);
637 * If the drive is empty, just let the open fail.
640 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
644 * If the device has the write protect tab set, have the open fail
645 * if the user expects to be able to write to the thing.
648 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
652 * It is possible that the disk changing stuff resulted in
653 * the device being taken offline. If this is the case,
654 * report this to the user, and don't pretend that the
655 * open actually succeeded.
658 if (!scsi_device_online(sdev
))
661 if (!sdkp
->openers
++ && sdev
->removable
) {
662 if (scsi_block_when_processing_errors(sdev
))
663 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
674 * sd_release - invoked when the (last) close(2) is called on this
676 * @inode: only i_rdev member may be used
677 * @filp: only f_mode and f_flags may be used
681 * Note: may block (uninterruptible) if error recovery is underway
684 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
686 struct scsi_disk
*sdkp
= scsi_disk(disk
);
687 struct scsi_device
*sdev
= sdkp
->device
;
689 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
691 if (!--sdkp
->openers
&& sdev
->removable
) {
692 if (scsi_block_when_processing_errors(sdev
))
693 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
697 * XXX and what if there are packets in flight and this close()
698 * XXX is followed by a "rmmod sd_mod"?
704 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
706 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
707 struct scsi_device
*sdp
= sdkp
->device
;
708 struct Scsi_Host
*host
= sdp
->host
;
711 /* default to most commonly used values */
712 diskinfo
[0] = 0x40; /* 1 << 6 */
713 diskinfo
[1] = 0x20; /* 1 << 5 */
714 diskinfo
[2] = sdkp
->capacity
>> 11;
716 /* override with calculated, extended default, or driver values */
717 if (host
->hostt
->bios_param
)
718 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
720 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
722 geo
->heads
= diskinfo
[0];
723 geo
->sectors
= diskinfo
[1];
724 geo
->cylinders
= diskinfo
[2];
729 * sd_ioctl - process an ioctl
730 * @inode: only i_rdev/i_bdev members may be used
731 * @filp: only f_mode and f_flags may be used
732 * @cmd: ioctl command number
733 * @arg: this is third argument given to ioctl(2) system call.
734 * Often contains a pointer.
736 * Returns 0 if successful (some ioctls return postive numbers on
737 * success as well). Returns a negated errno value in case of error.
739 * Note: most ioctls are forward onto the block subsystem or further
740 * down in the scsi subsystem.
742 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
743 unsigned int cmd
, unsigned long arg
)
745 struct gendisk
*disk
= bdev
->bd_disk
;
746 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
747 void __user
*p
= (void __user
*)arg
;
750 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
751 disk
->disk_name
, cmd
));
754 * If we are in the middle of error recovery, don't let anyone
755 * else try and use this device. Also, if error recovery fails, it
756 * may try and take the device offline, in which case all further
757 * access to the device is prohibited.
759 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
760 (mode
& FMODE_NDELAY
) != 0);
761 if (!scsi_block_when_processing_errors(sdp
) || !error
)
765 * Send SCSI addressing ioctls directly to mid level, send other
766 * ioctls to block level and then onto mid level if they can't be
770 case SCSI_IOCTL_GET_IDLUN
:
771 case SCSI_IOCTL_GET_BUS_NUMBER
:
772 return scsi_ioctl(sdp
, cmd
, p
);
774 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
775 if (error
!= -ENOTTY
)
778 return scsi_ioctl(sdp
, cmd
, p
);
781 static void set_media_not_present(struct scsi_disk
*sdkp
)
783 sdkp
->media_present
= 0;
785 sdkp
->device
->changed
= 1;
789 * sd_media_changed - check if our medium changed
790 * @disk: kernel device descriptor
792 * Returns 0 if not applicable or no change; 1 if change
794 * Note: this function is invoked from the block subsystem.
796 static int sd_media_changed(struct gendisk
*disk
)
798 struct scsi_disk
*sdkp
= scsi_disk(disk
);
799 struct scsi_device
*sdp
= sdkp
->device
;
800 struct scsi_sense_hdr
*sshdr
= NULL
;
803 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
809 * If the device is offline, don't send any commands - just pretend as
810 * if the command failed. If the device ever comes back online, we
811 * can deal with it then. It is only because of unrecoverable errors
812 * that we would ever take a device offline in the first place.
814 if (!scsi_device_online(sdp
)) {
815 set_media_not_present(sdkp
);
821 * Using TEST_UNIT_READY enables differentiation between drive with
822 * no cartridge loaded - NOT READY, drive with changed cartridge -
823 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
825 * Drives that auto spin down. eg iomega jaz 1G, will be started
826 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
827 * sd_revalidate() is called.
831 if (scsi_block_when_processing_errors(sdp
)) {
832 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
833 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
838 * Unable to test, unit probably not ready. This usually
839 * means there is no disc in the drive. Mark as changed,
840 * and we will figure it out later once the drive is
843 if (retval
|| (scsi_sense_valid(sshdr
) &&
844 /* 0x3a is medium not present */
845 sshdr
->asc
== 0x3a)) {
846 set_media_not_present(sdkp
);
852 * For removable scsi disk we have to recognise the presence
853 * of a disk in the drive. This is kept in the struct scsi_disk
854 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
856 sdkp
->media_present
= 1;
858 retval
= sdp
->changed
;
861 if (retval
!= sdkp
->previous_state
)
862 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
863 sdkp
->previous_state
= retval
;
868 static int sd_sync_cache(struct scsi_disk
*sdkp
)
871 struct scsi_device
*sdp
= sdkp
->device
;
872 struct scsi_sense_hdr sshdr
;
874 if (!scsi_device_online(sdp
))
878 for (retries
= 3; retries
> 0; --retries
) {
879 unsigned char cmd
[10] = { 0 };
881 cmd
[0] = SYNCHRONIZE_CACHE
;
883 * Leave the rest of the command zero to indicate
886 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
887 SD_TIMEOUT
, SD_MAX_RETRIES
);
893 sd_print_result(sdkp
, res
);
894 if (driver_byte(res
) & DRIVER_SENSE
)
895 sd_print_sense_hdr(sdkp
, &sshdr
);
903 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
905 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
906 rq
->timeout
= SD_TIMEOUT
;
907 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
911 static void sd_rescan(struct device
*dev
)
913 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
916 revalidate_disk(sdkp
->disk
);
924 * This gets directly called from VFS. When the ioctl
925 * is not recognized we go back to the other translation paths.
927 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
928 unsigned int cmd
, unsigned long arg
)
930 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
933 * If we are in the middle of error recovery, don't let anyone
934 * else try and use this device. Also, if error recovery fails, it
935 * may try and take the device offline, in which case all further
936 * access to the device is prohibited.
938 if (!scsi_block_when_processing_errors(sdev
))
941 if (sdev
->host
->hostt
->compat_ioctl
) {
944 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
950 * Let the static ioctl translation table take care of it.
956 static struct block_device_operations sd_fops
= {
957 .owner
= THIS_MODULE
,
959 .release
= sd_release
,
960 .locked_ioctl
= sd_ioctl
,
963 .compat_ioctl
= sd_compat_ioctl
,
965 .media_changed
= sd_media_changed
,
966 .revalidate_disk
= sd_revalidate_disk
,
969 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
971 u64 start_lba
= scmd
->request
->sector
;
972 u64 end_lba
= scmd
->request
->sector
+ (scsi_bufflen(scmd
) / 512);
976 if (!blk_fs_request(scmd
->request
))
979 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
980 SCSI_SENSE_BUFFERSIZE
,
985 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
988 if (scmd
->device
->sector_size
< 512) {
989 /* only legitimate sector_size here is 256 */
993 /* be careful ... don't want any overflows */
994 u64 factor
= scmd
->device
->sector_size
/ 512;
995 do_div(start_lba
, factor
);
996 do_div(end_lba
, factor
);
999 /* The bad lba was reported incorrectly, we have no idea where
1002 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1005 /* This computation should always be done in terms of
1006 * the resolution of the device's medium.
1008 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1012 * sd_done - bottom half handler: called when the lower level
1013 * driver has completed (successfully or otherwise) a scsi command.
1014 * @SCpnt: mid-level's per command structure.
1016 * Note: potentially run from within an ISR. Must not block.
1018 static int sd_done(struct scsi_cmnd
*SCpnt
)
1020 int result
= SCpnt
->result
;
1021 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1022 struct scsi_sense_hdr sshdr
;
1023 int sense_valid
= 0;
1024 int sense_deferred
= 0;
1027 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1029 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1031 #ifdef CONFIG_SCSI_LOGGING
1032 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1034 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1035 "sd_done: sb[respc,sk,asc,"
1036 "ascq]=%x,%x,%x,%x\n",
1037 sshdr
.response_code
,
1038 sshdr
.sense_key
, sshdr
.asc
,
1042 if (driver_byte(result
) != DRIVER_SENSE
&&
1043 (!sense_valid
|| sense_deferred
))
1046 switch (sshdr
.sense_key
) {
1047 case HARDWARE_ERROR
:
1049 good_bytes
= sd_completed_bytes(SCpnt
);
1051 case RECOVERED_ERROR
:
1052 /* Inform the user, but make sure that it's not treated
1055 scsi_print_sense("sd", SCpnt
);
1057 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1058 good_bytes
= scsi_bufflen(SCpnt
);
1061 /* This indicates a false check condition, so ignore it. An
1062 * unknown amount of data was transferred so treat it as an
1065 scsi_print_sense("sd", SCpnt
);
1067 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1069 case ABORTED_COMMAND
:
1070 if (sshdr
.asc
== 0x10) { /* DIF: Disk detected corruption */
1071 scsi_print_result(SCpnt
);
1072 scsi_print_sense("sd", SCpnt
);
1073 good_bytes
= sd_completed_bytes(SCpnt
);
1076 case ILLEGAL_REQUEST
:
1077 if (sshdr
.asc
== 0x10) { /* DIX: HBA detected corruption */
1078 scsi_print_result(SCpnt
);
1079 scsi_print_sense("sd", SCpnt
);
1080 good_bytes
= sd_completed_bytes(SCpnt
);
1087 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1088 sd_dif_complete(SCpnt
, good_bytes
);
1093 static int media_not_present(struct scsi_disk
*sdkp
,
1094 struct scsi_sense_hdr
*sshdr
)
1097 if (!scsi_sense_valid(sshdr
))
1099 /* not invoked for commands that could return deferred errors */
1100 if (sshdr
->sense_key
!= NOT_READY
&&
1101 sshdr
->sense_key
!= UNIT_ATTENTION
)
1103 if (sshdr
->asc
!= 0x3A) /* medium not present */
1106 set_media_not_present(sdkp
);
1111 * spinup disk - called only in sd_revalidate_disk()
1114 sd_spinup_disk(struct scsi_disk
*sdkp
)
1116 unsigned char cmd
[10];
1117 unsigned long spintime_expire
= 0;
1118 int retries
, spintime
;
1119 unsigned int the_result
;
1120 struct scsi_sense_hdr sshdr
;
1121 int sense_valid
= 0;
1125 /* Spin up drives, as required. Only do this at boot time */
1126 /* Spinup needs to be done for module loads too. */
1131 cmd
[0] = TEST_UNIT_READY
;
1132 memset((void *) &cmd
[1], 0, 9);
1134 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1140 * If the drive has indicated to us that it
1141 * doesn't have any media in it, don't bother
1142 * with any more polling.
1144 if (media_not_present(sdkp
, &sshdr
))
1148 sense_valid
= scsi_sense_valid(&sshdr
);
1150 } while (retries
< 3 &&
1151 (!scsi_status_is_good(the_result
) ||
1152 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1153 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1155 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1156 /* no sense, TUR either succeeded or failed
1157 * with a status error */
1158 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1159 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1160 sd_print_result(sdkp
, the_result
);
1166 * The device does not want the automatic start to be issued.
1168 if (sdkp
->device
->no_start_on_add
) {
1173 * If manual intervention is required, or this is an
1174 * absent USB storage device, a spinup is meaningless.
1177 sshdr
.sense_key
== NOT_READY
&&
1178 sshdr
.asc
== 4 && sshdr
.ascq
== 3) {
1179 break; /* manual intervention required */
1182 * Issue command to spin up drive when not ready
1184 } else if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1186 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1187 cmd
[0] = START_STOP
;
1188 cmd
[1] = 1; /* Return immediately */
1189 memset((void *) &cmd
[2], 0, 8);
1190 cmd
[4] = 1; /* Start spin cycle */
1191 if (sdkp
->device
->start_stop_pwr_cond
)
1193 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1195 SD_TIMEOUT
, SD_MAX_RETRIES
);
1196 spintime_expire
= jiffies
+ 100 * HZ
;
1199 /* Wait 1 second for next try */
1204 * Wait for USB flash devices with slow firmware.
1205 * Yes, this sense key/ASC combination shouldn't
1206 * occur here. It's characteristic of these devices.
1208 } else if (sense_valid
&&
1209 sshdr
.sense_key
== UNIT_ATTENTION
&&
1210 sshdr
.asc
== 0x28) {
1212 spintime_expire
= jiffies
+ 5 * HZ
;
1215 /* Wait 1 second for next try */
1218 /* we don't understand the sense code, so it's
1219 * probably pointless to loop */
1221 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1222 sd_print_sense_hdr(sdkp
, &sshdr
);
1227 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1230 if (scsi_status_is_good(the_result
))
1233 printk("not responding...\n");
1239 * Determine whether disk supports Data Integrity Field.
1241 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1243 struct scsi_device
*sdp
= sdkp
->device
;
1246 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1249 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1251 sdkp
->protection_type
= type
;
1254 case SD_DIF_TYPE0_PROTECTION
:
1255 case SD_DIF_TYPE1_PROTECTION
:
1256 case SD_DIF_TYPE3_PROTECTION
:
1259 case SD_DIF_TYPE2_PROTECTION
:
1260 sd_printk(KERN_ERR
, sdkp
, "formatted with DIF Type 2 " \
1261 "protection which is currently unsupported. " \
1262 "Disabling disk!\n");
1266 sd_printk(KERN_ERR
, sdkp
, "formatted with unknown " \
1267 "protection type %d. Disabling disk!\n", type
);
1278 * read disk capacity
1281 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1283 unsigned char cmd
[16];
1284 int the_result
, retries
;
1285 int sector_size
= 0;
1286 /* Force READ CAPACITY(16) when PROTECT=1 */
1287 int longrc
= scsi_device_protection(sdkp
->device
) ? 1 : 0;
1288 struct scsi_sense_hdr sshdr
;
1289 int sense_valid
= 0;
1290 struct scsi_device
*sdp
= sdkp
->device
;
1296 memset((void *) cmd
, 0, 16);
1297 cmd
[0] = SERVICE_ACTION_IN
;
1298 cmd
[1] = SAI_READ_CAPACITY_16
;
1300 memset((void *) buffer
, 0, 13);
1302 cmd
[0] = READ_CAPACITY
;
1303 memset((void *) &cmd
[1], 0, 9);
1304 memset((void *) buffer
, 0, 8);
1307 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1308 buffer
, longrc
? 13 : 8, &sshdr
,
1309 SD_TIMEOUT
, SD_MAX_RETRIES
);
1311 if (media_not_present(sdkp
, &sshdr
))
1315 sense_valid
= scsi_sense_valid(&sshdr
);
1318 } while (the_result
&& retries
);
1320 if (the_result
&& !longrc
) {
1321 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1322 sd_print_result(sdkp
, the_result
);
1323 if (driver_byte(the_result
) & DRIVER_SENSE
)
1324 sd_print_sense_hdr(sdkp
, &sshdr
);
1326 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1328 /* Set dirty bit for removable devices if not ready -
1329 * sometimes drives will not report this properly. */
1330 if (sdp
->removable
&&
1331 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1334 /* Either no media are present but the drive didn't tell us,
1335 or they are present but the read capacity command fails */
1336 /* sdkp->media_present = 0; -- not always correct */
1337 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1340 } else if (the_result
&& longrc
) {
1341 /* READ CAPACITY(16) has been failed */
1342 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1343 sd_print_result(sdkp
, the_result
);
1344 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1346 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1351 sector_size
= (buffer
[4] << 24) |
1352 (buffer
[5] << 16) | (buffer
[6] << 8) | buffer
[7];
1353 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1354 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1355 if(sizeof(sdkp
->capacity
) > 4) {
1356 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1357 "Trying to use READ CAPACITY(16).\n");
1361 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1362 "a kernel compiled with support for large "
1363 "block devices.\n");
1367 sdkp
->capacity
= 1 + (((sector_t
)buffer
[0] << 24) |
1372 sdkp
->capacity
= 1 + (((u64
)buffer
[0] << 56) |
1373 ((u64
)buffer
[1] << 48) |
1374 ((u64
)buffer
[2] << 40) |
1375 ((u64
)buffer
[3] << 32) |
1376 ((sector_t
)buffer
[4] << 24) |
1377 ((sector_t
)buffer
[5] << 16) |
1378 ((sector_t
)buffer
[6] << 8) |
1379 (sector_t
)buffer
[7]);
1381 sector_size
= (buffer
[8] << 24) |
1382 (buffer
[9] << 16) | (buffer
[10] << 8) | buffer
[11];
1384 sd_read_protection_type(sdkp
, buffer
);
1387 /* Some devices return the total number of sectors, not the
1388 * highest sector number. Make the necessary adjustment. */
1389 if (sdp
->fix_capacity
) {
1392 /* Some devices have version which report the correct sizes
1393 * and others which do not. We guess size according to a heuristic
1394 * and err on the side of lowering the capacity. */
1396 if (sdp
->guess_capacity
)
1397 if (sdkp
->capacity
& 0x01) /* odd sizes are odd */
1402 if (sector_size
== 0) {
1404 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1408 if (sector_size
!= 512 &&
1409 sector_size
!= 1024 &&
1410 sector_size
!= 2048 &&
1411 sector_size
!= 4096 &&
1412 sector_size
!= 256) {
1413 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1416 * The user might want to re-format the drive with
1417 * a supported sectorsize. Once this happens, it
1418 * would be relatively trivial to set the thing up.
1419 * For this reason, we leave the thing in the table.
1423 * set a bogus sector size so the normal read/write
1424 * logic in the block layer will eventually refuse any
1425 * request on this device without tripping over power
1426 * of two sector size assumptions
1430 blk_queue_hardsect_size(sdp
->request_queue
, sector_size
);
1433 char cap_str_2
[10], cap_str_10
[10];
1434 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1436 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1438 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1439 sizeof(cap_str_10
));
1441 sd_printk(KERN_NOTICE
, sdkp
,
1442 "%llu %d-byte hardware sectors: (%s/%s)\n",
1443 (unsigned long long)sdkp
->capacity
,
1444 sector_size
, cap_str_10
, cap_str_2
);
1447 /* Rescale capacity to 512-byte units */
1448 if (sector_size
== 4096)
1449 sdkp
->capacity
<<= 3;
1450 else if (sector_size
== 2048)
1451 sdkp
->capacity
<<= 2;
1452 else if (sector_size
== 1024)
1453 sdkp
->capacity
<<= 1;
1454 else if (sector_size
== 256)
1455 sdkp
->capacity
>>= 1;
1457 sdkp
->device
->sector_size
= sector_size
;
1460 /* called with buffer of length 512 */
1462 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1463 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1464 struct scsi_sense_hdr
*sshdr
)
1466 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1467 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1472 * read write protect setting, if possible - called only in sd_revalidate_disk()
1473 * called with buffer of length SD_BUF_SIZE
1476 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1479 struct scsi_device
*sdp
= sdkp
->device
;
1480 struct scsi_mode_data data
;
1482 set_disk_ro(sdkp
->disk
, 0);
1483 if (sdp
->skip_ms_page_3f
) {
1484 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1488 if (sdp
->use_192_bytes_for_3f
) {
1489 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1492 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1493 * We have to start carefully: some devices hang if we ask
1494 * for more than is available.
1496 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1499 * Second attempt: ask for page 0 When only page 0 is
1500 * implemented, a request for page 3F may return Sense Key
1501 * 5: Illegal Request, Sense Code 24: Invalid field in
1504 if (!scsi_status_is_good(res
))
1505 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1508 * Third attempt: ask 255 bytes, as we did earlier.
1510 if (!scsi_status_is_good(res
))
1511 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1515 if (!scsi_status_is_good(res
)) {
1516 sd_printk(KERN_WARNING
, sdkp
,
1517 "Test WP failed, assume Write Enabled\n");
1519 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1520 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1521 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1522 sdkp
->write_prot
? "on" : "off");
1523 sd_printk(KERN_DEBUG
, sdkp
,
1524 "Mode Sense: %02x %02x %02x %02x\n",
1525 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1530 * sd_read_cache_type - called only from sd_revalidate_disk()
1531 * called with buffer of length SD_BUF_SIZE
1534 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1537 struct scsi_device
*sdp
= sdkp
->device
;
1541 struct scsi_mode_data data
;
1542 struct scsi_sense_hdr sshdr
;
1544 if (sdp
->skip_ms_page_8
)
1547 if (sdp
->type
== TYPE_RBC
) {
1555 /* cautiously ask */
1556 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1558 if (!scsi_status_is_good(res
))
1561 if (!data
.header_length
) {
1563 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1566 /* that went OK, now ask for the proper length */
1570 * We're only interested in the first three bytes, actually.
1571 * But the data cache page is defined for the first 20.
1578 /* Take headers and block descriptors into account */
1579 len
+= data
.header_length
+ data
.block_descriptor_length
;
1580 if (len
> SD_BUF_SIZE
)
1584 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1586 if (scsi_status_is_good(res
)) {
1587 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1589 if (offset
>= SD_BUF_SIZE
- 2) {
1590 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1594 if ((buffer
[offset
] & 0x3f) != modepage
) {
1595 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1599 if (modepage
== 8) {
1600 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1601 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1603 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1607 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1608 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1609 sd_printk(KERN_NOTICE
, sdkp
,
1610 "Uses READ/WRITE(6), disabling FUA\n");
1614 sd_printk(KERN_NOTICE
, sdkp
,
1615 "Write cache: %s, read cache: %s, %s\n",
1616 sdkp
->WCE
? "enabled" : "disabled",
1617 sdkp
->RCD
? "disabled" : "enabled",
1618 sdkp
->DPOFUA
? "supports DPO and FUA"
1619 : "doesn't support DPO or FUA");
1625 if (scsi_sense_valid(&sshdr
) &&
1626 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1627 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1628 /* Invalid field in CDB */
1629 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1631 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1634 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1641 * The ATO bit indicates whether the DIF application tag is available
1642 * for use by the operating system.
1644 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1647 struct scsi_device
*sdp
= sdkp
->device
;
1648 struct scsi_mode_data data
;
1649 struct scsi_sense_hdr sshdr
;
1651 if (sdp
->type
!= TYPE_DISK
)
1654 if (sdkp
->protection_type
== 0)
1657 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1658 SD_MAX_RETRIES
, &data
, &sshdr
);
1660 if (!scsi_status_is_good(res
) || !data
.header_length
||
1662 sd_printk(KERN_WARNING
, sdkp
,
1663 "getting Control mode page failed, assume no ATO\n");
1665 if (scsi_sense_valid(&sshdr
))
1666 sd_print_sense_hdr(sdkp
, &sshdr
);
1671 offset
= data
.header_length
+ data
.block_descriptor_length
;
1673 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1674 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1678 if ((buffer
[offset
+ 5] & 0x80) == 0)
1687 * sd_revalidate_disk - called the first time a new disk is seen,
1688 * performs disk spin up, read_capacity, etc.
1689 * @disk: struct gendisk we care about
1691 static int sd_revalidate_disk(struct gendisk
*disk
)
1693 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1694 struct scsi_device
*sdp
= sdkp
->device
;
1695 unsigned char *buffer
;
1698 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1699 "sd_revalidate_disk\n"));
1702 * If the device is offline, don't try and read capacity or any
1703 * of the other niceties.
1705 if (!scsi_device_online(sdp
))
1708 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1710 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1711 "allocation failure.\n");
1715 /* defaults, until the device tells us otherwise */
1716 sdp
->sector_size
= 512;
1718 sdkp
->media_present
= 1;
1719 sdkp
->write_prot
= 0;
1724 sd_spinup_disk(sdkp
);
1727 * Without media there is no reason to ask; moreover, some devices
1728 * react badly if we do.
1730 if (sdkp
->media_present
) {
1731 sd_read_capacity(sdkp
, buffer
);
1732 sd_read_write_protect_flag(sdkp
, buffer
);
1733 sd_read_cache_type(sdkp
, buffer
);
1734 sd_read_app_tag_own(sdkp
, buffer
);
1738 * We now have all cache related info, determine how we deal
1739 * with ordered requests. Note that as the current SCSI
1740 * dispatch function can alter request order, we cannot use
1741 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1744 ordered
= sdkp
->DPOFUA
1745 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1747 ordered
= QUEUE_ORDERED_DRAIN
;
1749 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1751 set_capacity(disk
, sdkp
->capacity
);
1759 * sd_format_disk_name - format disk name
1760 * @prefix: name prefix - ie. "sd" for SCSI disks
1761 * @index: index of the disk to format name for
1762 * @buf: output buffer
1763 * @buflen: length of the output buffer
1765 * SCSI disk names starts at sda. The 26th device is sdz and the
1766 * 27th is sdaa. The last one for two lettered suffix is sdzz
1767 * which is followed by sdaaa.
1769 * This is basically 26 base counting with one extra 'nil' entry
1770 * at the beggining from the second digit on and can be
1771 * determined using similar method as 26 base conversion with the
1772 * index shifted -1 after each digit is computed.
1778 * 0 on success, -errno on failure.
1780 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
1782 const int base
= 'z' - 'a' + 1;
1783 char *begin
= buf
+ strlen(prefix
);
1784 char *end
= buf
+ buflen
;
1794 *--p
= 'a' + (index
% unit
);
1795 index
= (index
/ unit
) - 1;
1796 } while (index
>= 0);
1798 memmove(begin
, p
, end
- p
);
1799 memcpy(buf
, prefix
, strlen(prefix
));
1805 * sd_probe - called during driver initialization and whenever a
1806 * new scsi device is attached to the system. It is called once
1807 * for each scsi device (not just disks) present.
1808 * @dev: pointer to device object
1810 * Returns 0 if successful (or not interested in this scsi device
1811 * (e.g. scanner)); 1 when there is an error.
1813 * Note: this function is invoked from the scsi mid-level.
1814 * This function sets up the mapping between a given
1815 * <host,channel,id,lun> (found in sdp) and new device name
1816 * (e.g. /dev/sda). More precisely it is the block device major
1817 * and minor number that is chosen here.
1819 * Assume sd_attach is not re-entrant (for time being)
1820 * Also think about sd_attach() and sd_remove() running coincidentally.
1822 static int sd_probe(struct device
*dev
)
1824 struct scsi_device
*sdp
= to_scsi_device(dev
);
1825 struct scsi_disk
*sdkp
;
1831 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1834 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1838 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1842 gd
= alloc_disk(SD_MINORS
);
1847 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
1850 error
= ida_get_new(&sd_index_ida
, &index
);
1851 } while (error
== -EAGAIN
);
1856 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
1858 goto out_free_index
;
1861 sdkp
->driver
= &sd_template
;
1863 sdkp
->index
= index
;
1865 sdkp
->previous_state
= 1;
1867 if (!sdp
->request_queue
->rq_timeout
) {
1868 if (sdp
->type
!= TYPE_MOD
)
1869 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
1871 blk_queue_rq_timeout(sdp
->request_queue
,
1875 device_initialize(&sdkp
->dev
);
1876 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
1877 sdkp
->dev
.class = &sd_disk_class
;
1878 strncpy(sdkp
->dev
.bus_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1880 if (device_add(&sdkp
->dev
))
1881 goto out_free_index
;
1883 get_device(&sdp
->sdev_gendev
);
1885 if (index
< SD_MAX_DISKS
) {
1886 gd
->major
= sd_major((index
& 0xf0) >> 4);
1887 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1888 gd
->minors
= SD_MINORS
;
1890 gd
->fops
= &sd_fops
;
1891 gd
->private_data
= &sdkp
->driver
;
1892 gd
->queue
= sdkp
->device
->request_queue
;
1894 sd_revalidate_disk(gd
);
1896 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
1898 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1899 gd
->flags
= GENHD_FL_EXT_DEVT
| GENHD_FL_DRIVERFS
;
1901 gd
->flags
|= GENHD_FL_REMOVABLE
;
1903 dev_set_drvdata(dev
, sdkp
);
1905 sd_dif_config_host(sdkp
);
1907 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1908 sdp
->removable
? "removable " : "");
1913 ida_remove(&sd_index_ida
, index
);
1923 * sd_remove - called whenever a scsi disk (previously recognized by
1924 * sd_probe) is detached from the system. It is called (potentially
1925 * multiple times) during sd module unload.
1926 * @sdp: pointer to mid level scsi device object
1928 * Note: this function is invoked from the scsi mid-level.
1929 * This function potentially frees up a device name (e.g. /dev/sdc)
1930 * that could be re-used by a subsequent sd_probe().
1931 * This function is not called when the built-in sd driver is "exit-ed".
1933 static int sd_remove(struct device
*dev
)
1935 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1937 device_del(&sdkp
->dev
);
1938 del_gendisk(sdkp
->disk
);
1941 mutex_lock(&sd_ref_mutex
);
1942 dev_set_drvdata(dev
, NULL
);
1943 put_device(&sdkp
->dev
);
1944 mutex_unlock(&sd_ref_mutex
);
1950 * scsi_disk_release - Called to free the scsi_disk structure
1951 * @dev: pointer to embedded class device
1953 * sd_ref_mutex must be held entering this routine. Because it is
1954 * called on last put, you should always use the scsi_disk_get()
1955 * scsi_disk_put() helpers which manipulate the semaphore directly
1956 * and never do a direct put_device.
1958 static void scsi_disk_release(struct device
*dev
)
1960 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
1961 struct gendisk
*disk
= sdkp
->disk
;
1963 ida_remove(&sd_index_ida
, sdkp
->index
);
1965 disk
->private_data
= NULL
;
1967 put_device(&sdkp
->device
->sdev_gendev
);
1972 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1974 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1975 struct scsi_sense_hdr sshdr
;
1976 struct scsi_device
*sdp
= sdkp
->device
;
1980 cmd
[4] |= 1; /* START */
1982 if (sdp
->start_stop_pwr_cond
)
1983 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
1985 if (!scsi_device_online(sdp
))
1988 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1989 SD_TIMEOUT
, SD_MAX_RETRIES
);
1991 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1992 sd_print_result(sdkp
, res
);
1993 if (driver_byte(res
) & DRIVER_SENSE
)
1994 sd_print_sense_hdr(sdkp
, &sshdr
);
2001 * Send a SYNCHRONIZE CACHE instruction down to the device through
2002 * the normal SCSI command structure. Wait for the command to
2005 static void sd_shutdown(struct device
*dev
)
2007 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2010 return; /* this can happen */
2013 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2014 sd_sync_cache(sdkp
);
2017 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2018 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2019 sd_start_stop_device(sdkp
, 0);
2022 scsi_disk_put(sdkp
);
2025 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2027 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2031 return 0; /* this can happen */
2034 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2035 ret
= sd_sync_cache(sdkp
);
2040 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2041 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2042 ret
= sd_start_stop_device(sdkp
, 0);
2046 scsi_disk_put(sdkp
);
2050 static int sd_resume(struct device
*dev
)
2052 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2055 if (!sdkp
->device
->manage_start_stop
)
2058 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2059 ret
= sd_start_stop_device(sdkp
, 1);
2062 scsi_disk_put(sdkp
);
2067 * init_sd - entry point for this driver (both when built in or when
2070 * Note: this function registers this driver with the scsi mid-level.
2072 static int __init
init_sd(void)
2074 int majors
= 0, i
, err
;
2076 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2078 for (i
= 0; i
< SD_MAJORS
; i
++)
2079 if (register_blkdev(sd_major(i
), "sd") == 0)
2085 err
= class_register(&sd_disk_class
);
2089 err
= scsi_register_driver(&sd_template
.gendrv
);
2096 class_unregister(&sd_disk_class
);
2098 for (i
= 0; i
< SD_MAJORS
; i
++)
2099 unregister_blkdev(sd_major(i
), "sd");
2104 * exit_sd - exit point for this driver (when it is a module).
2106 * Note: this function unregisters this driver from the scsi mid-level.
2108 static void __exit
exit_sd(void)
2112 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2114 scsi_unregister_driver(&sd_template
.gendrv
);
2115 class_unregister(&sd_disk_class
);
2117 for (i
= 0; i
< SD_MAJORS
; i
++)
2118 unregister_blkdev(sd_major(i
), "sd");
2121 module_init(init_sd
);
2122 module_exit(exit_sd
);
2124 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2125 struct scsi_sense_hdr
*sshdr
)
2127 sd_printk(KERN_INFO
, sdkp
, "");
2128 scsi_show_sense_hdr(sshdr
);
2129 sd_printk(KERN_INFO
, sdkp
, "");
2130 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2133 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2135 sd_printk(KERN_INFO
, sdkp
, "");
2136 scsi_show_result(result
);