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 <asm/uaccess.h>
51 #include <asm/unaligned.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 static int sd_revalidate_disk(struct gendisk
*disk
);
91 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
);
92 static int sd_probe(struct device
*);
93 static int sd_remove(struct device
*);
94 static void sd_shutdown(struct device
*dev
);
95 static int sd_suspend(struct device
*dev
, pm_message_t state
);
96 static int sd_resume(struct device
*dev
);
97 static void sd_rescan(struct device
*);
98 static int sd_init_command(struct scsi_cmnd
*);
99 static int sd_issue_flush(struct device
*, sector_t
*);
100 static void sd_prepare_flush(request_queue_t
*, struct request
*);
101 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
102 static void scsi_disk_release(struct class_device
*cdev
);
103 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
104 static void sd_print_result(struct scsi_disk
*, int);
106 static DEFINE_IDA(sd_index_ida
);
108 /* This semaphore is used to mediate the 0->1 reference get in the
109 * face of object destruction (i.e. we can't allow a get on an
110 * object after last put) */
111 static DEFINE_MUTEX(sd_ref_mutex
);
113 static const char *sd_cache_types
[] = {
114 "write through", "none", "write back",
115 "write back, no read (daft)"
118 static ssize_t
sd_store_cache_type(struct class_device
*cdev
, const char *buf
,
121 int i
, ct
= -1, rcd
, wce
, sp
;
122 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
123 struct scsi_device
*sdp
= sdkp
->device
;
126 struct scsi_mode_data data
;
127 struct scsi_sense_hdr sshdr
;
130 if (sdp
->type
!= TYPE_DISK
)
131 /* no cache control on RBC devices; theoretically they
132 * can do it, but there's probably so many exceptions
133 * it's not worth the risk */
136 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
137 const int len
= strlen(sd_cache_types
[i
]);
138 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
146 rcd
= ct
& 0x01 ? 1 : 0;
147 wce
= ct
& 0x02 ? 1 : 0;
148 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
149 SD_MAX_RETRIES
, &data
, NULL
))
151 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
152 data
.block_descriptor_length
);
153 buffer_data
= buffer
+ data
.header_length
+
154 data
.block_descriptor_length
;
155 buffer_data
[2] &= ~0x05;
156 buffer_data
[2] |= wce
<< 2 | rcd
;
157 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
159 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
160 SD_MAX_RETRIES
, &data
, &sshdr
)) {
161 if (scsi_sense_valid(&sshdr
))
162 sd_print_sense_hdr(sdkp
, &sshdr
);
165 sd_revalidate_disk(sdkp
->disk
);
169 static ssize_t
sd_store_manage_start_stop(struct class_device
*cdev
,
170 const char *buf
, size_t count
)
172 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
173 struct scsi_device
*sdp
= sdkp
->device
;
175 if (!capable(CAP_SYS_ADMIN
))
178 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
183 static ssize_t
sd_store_allow_restart(struct class_device
*cdev
, const char *buf
,
186 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
187 struct scsi_device
*sdp
= sdkp
->device
;
189 if (!capable(CAP_SYS_ADMIN
))
192 if (sdp
->type
!= TYPE_DISK
)
195 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
200 static ssize_t
sd_show_cache_type(struct class_device
*cdev
, char *buf
)
202 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
203 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
205 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
208 static ssize_t
sd_show_fua(struct class_device
*cdev
, char *buf
)
210 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
212 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
215 static ssize_t
sd_show_manage_start_stop(struct class_device
*cdev
, char *buf
)
217 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
218 struct scsi_device
*sdp
= sdkp
->device
;
220 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
223 static ssize_t
sd_show_allow_restart(struct class_device
*cdev
, char *buf
)
225 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
227 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
230 static struct class_device_attribute sd_disk_attrs
[] = {
231 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
232 sd_store_cache_type
),
233 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
234 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
235 sd_store_allow_restart
),
236 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
237 sd_store_manage_start_stop
),
241 static struct class sd_disk_class
= {
243 .owner
= THIS_MODULE
,
244 .release
= scsi_disk_release
,
245 .class_dev_attrs
= sd_disk_attrs
,
248 static struct scsi_driver sd_template
= {
249 .owner
= THIS_MODULE
,
254 .suspend
= sd_suspend
,
256 .shutdown
= sd_shutdown
,
259 .init_command
= sd_init_command
,
260 .issue_flush
= sd_issue_flush
,
264 * Device no to disk mapping:
266 * major disc2 disc p1
267 * |............|.............|....|....| <- dev_t
270 * Inside a major, we have 16k disks, however mapped non-
271 * contiguously. The first 16 disks are for major0, the next
272 * ones with major1, ... Disk 256 is for major0 again, disk 272
274 * As we stay compatible with our numbering scheme, we can reuse
275 * the well-know SCSI majors 8, 65--71, 136--143.
277 static int sd_major(int major_idx
)
281 return SCSI_DISK0_MAJOR
;
283 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
285 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
288 return 0; /* shut up gcc */
292 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
294 struct scsi_disk
*sdkp
= NULL
;
296 if (disk
->private_data
) {
297 sdkp
= scsi_disk(disk
);
298 if (scsi_device_get(sdkp
->device
) == 0)
299 class_device_get(&sdkp
->cdev
);
306 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
308 struct scsi_disk
*sdkp
;
310 mutex_lock(&sd_ref_mutex
);
311 sdkp
= __scsi_disk_get(disk
);
312 mutex_unlock(&sd_ref_mutex
);
316 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
318 struct scsi_disk
*sdkp
;
320 mutex_lock(&sd_ref_mutex
);
321 sdkp
= dev_get_drvdata(dev
);
323 sdkp
= __scsi_disk_get(sdkp
->disk
);
324 mutex_unlock(&sd_ref_mutex
);
328 static void scsi_disk_put(struct scsi_disk
*sdkp
)
330 struct scsi_device
*sdev
= sdkp
->device
;
332 mutex_lock(&sd_ref_mutex
);
333 class_device_put(&sdkp
->cdev
);
334 scsi_device_put(sdev
);
335 mutex_unlock(&sd_ref_mutex
);
339 * sd_init_command - build a scsi (read or write) command from
340 * information in the request structure.
341 * @SCpnt: pointer to mid-level's per scsi command structure that
342 * contains request and into which the scsi command is written
344 * Returns 1 if successful and 0 if error (or cannot be done now).
346 static int sd_init_command(struct scsi_cmnd
* SCpnt
)
348 struct scsi_device
*sdp
= SCpnt
->device
;
349 struct request
*rq
= SCpnt
->request
;
350 struct gendisk
*disk
= rq
->rq_disk
;
351 sector_t block
= rq
->sector
;
353 unsigned int this_count
= SCpnt
->request_bufflen
>> 9;
354 unsigned int timeout
= sdp
->timeout
;
356 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
357 "sd_init_command: block=%llu, "
359 (unsigned long long)block
,
362 if (!sdp
|| !scsi_device_online(sdp
) ||
363 block
+ rq
->nr_sectors
> get_capacity(disk
)) {
364 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
365 "Finishing %ld sectors\n",
367 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
368 "Retry with 0x%p\n", SCpnt
));
374 * quietly refuse to do anything to a changed disc until
375 * the changed bit has been reset
377 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
382 * Some SD card readers can't handle multi-sector accesses which touch
383 * the last one or two hardware sectors. Split accesses as needed.
385 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
386 (sdp
->sector_size
/ 512);
388 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
389 if (block
< threshold
) {
390 /* Access up to the threshold but not beyond */
391 this_count
= threshold
- block
;
393 /* Access only a single hardware sector */
394 this_count
= sdp
->sector_size
/ 512;
398 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
399 (unsigned long long)block
));
402 * If we have a 1K hardware sectorsize, prevent access to single
403 * 512 byte sectors. In theory we could handle this - in fact
404 * the scsi cdrom driver must be able to handle this because
405 * we typically use 1K blocksizes, and cdroms typically have
406 * 2K hardware sectorsizes. Of course, things are simpler
407 * with the cdrom, since it is read-only. For performance
408 * reasons, the filesystems should be able to handle this
409 * and not force the scsi disk driver to use bounce buffers
412 if (sdp
->sector_size
== 1024) {
413 if ((block
& 1) || (rq
->nr_sectors
& 1)) {
414 scmd_printk(KERN_ERR
, SCpnt
,
415 "Bad block number requested\n");
419 this_count
= this_count
>> 1;
422 if (sdp
->sector_size
== 2048) {
423 if ((block
& 3) || (rq
->nr_sectors
& 3)) {
424 scmd_printk(KERN_ERR
, SCpnt
,
425 "Bad block number requested\n");
429 this_count
= this_count
>> 2;
432 if (sdp
->sector_size
== 4096) {
433 if ((block
& 7) || (rq
->nr_sectors
& 7)) {
434 scmd_printk(KERN_ERR
, SCpnt
,
435 "Bad block number requested\n");
439 this_count
= this_count
>> 3;
442 if (rq_data_dir(rq
) == WRITE
) {
443 if (!sdp
->writeable
) {
446 SCpnt
->cmnd
[0] = WRITE_6
;
447 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
448 } else if (rq_data_dir(rq
) == READ
) {
449 SCpnt
->cmnd
[0] = READ_6
;
450 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
452 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
456 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
457 "%s %d/%ld 512 byte blocks.\n",
458 (rq_data_dir(rq
) == WRITE
) ?
459 "writing" : "reading", this_count
,
464 if (block
> 0xffffffff) {
465 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
466 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
467 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
468 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
469 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
470 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
471 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
472 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
473 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
474 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
475 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
476 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
477 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
478 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
479 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
480 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
481 SCpnt
->device
->use_10_for_rw
) {
482 if (this_count
> 0xffff)
485 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
486 SCpnt
->cmnd
[1] |= blk_fua_rq(rq
) ? 0x8 : 0;
487 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
488 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
489 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
490 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
491 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
492 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
493 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
495 if (unlikely(blk_fua_rq(rq
))) {
497 * This happens only if this drive failed
498 * 10byte rw command with ILLEGAL_REQUEST
499 * during operation and thus turned off
502 scmd_printk(KERN_ERR
, SCpnt
,
503 "FUA write on READ/WRITE(6) drive\n");
507 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
508 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
509 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
510 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
513 SCpnt
->request_bufflen
= this_count
* sdp
->sector_size
;
516 * We shouldn't disconnect in the middle of a sector, so with a dumb
517 * host adapter, it's safe to assume that we can at least transfer
518 * this many bytes between each connect / disconnect.
520 SCpnt
->transfersize
= sdp
->sector_size
;
521 SCpnt
->underflow
= this_count
<< 9;
522 SCpnt
->allowed
= SD_MAX_RETRIES
;
523 SCpnt
->timeout_per_command
= timeout
;
526 * This is the completion routine we use. This is matched in terms
527 * of capability to this function.
529 SCpnt
->done
= sd_rw_intr
;
532 * This indicates that the command is ready from our end to be
539 * sd_open - open a scsi disk device
540 * @inode: only i_rdev member may be used
541 * @filp: only f_mode and f_flags may be used
543 * Returns 0 if successful. Returns a negated errno value in case
546 * Note: This can be called from a user context (e.g. fsck(1) )
547 * or from within the kernel (e.g. as a result of a mount(1) ).
548 * In the latter case @inode and @filp carry an abridged amount
549 * of information as noted above.
551 static int sd_open(struct inode
*inode
, struct file
*filp
)
553 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
554 struct scsi_disk
*sdkp
;
555 struct scsi_device
*sdev
;
558 if (!(sdkp
= scsi_disk_get(disk
)))
562 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
567 * If the device is in error recovery, wait until it is done.
568 * If the device is offline, then disallow any access to it.
571 if (!scsi_block_when_processing_errors(sdev
))
574 if (sdev
->removable
|| sdkp
->write_prot
)
575 check_disk_change(inode
->i_bdev
);
578 * If the drive is empty, just let the open fail.
581 if (sdev
->removable
&& !sdkp
->media_present
&&
582 !(filp
->f_flags
& O_NDELAY
))
586 * If the device has the write protect tab set, have the open fail
587 * if the user expects to be able to write to the thing.
590 if (sdkp
->write_prot
&& (filp
->f_mode
& FMODE_WRITE
))
594 * It is possible that the disk changing stuff resulted in
595 * the device being taken offline. If this is the case,
596 * report this to the user, and don't pretend that the
597 * open actually succeeded.
600 if (!scsi_device_online(sdev
))
603 if (!sdkp
->openers
++ && sdev
->removable
) {
604 if (scsi_block_when_processing_errors(sdev
))
605 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
616 * sd_release - invoked when the (last) close(2) is called on this
618 * @inode: only i_rdev member may be used
619 * @filp: only f_mode and f_flags may be used
623 * Note: may block (uninterruptible) if error recovery is underway
626 static int sd_release(struct inode
*inode
, struct file
*filp
)
628 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
629 struct scsi_disk
*sdkp
= scsi_disk(disk
);
630 struct scsi_device
*sdev
= sdkp
->device
;
632 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
634 if (!--sdkp
->openers
&& sdev
->removable
) {
635 if (scsi_block_when_processing_errors(sdev
))
636 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
640 * XXX and what if there are packets in flight and this close()
641 * XXX is followed by a "rmmod sd_mod"?
647 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
649 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
650 struct scsi_device
*sdp
= sdkp
->device
;
651 struct Scsi_Host
*host
= sdp
->host
;
654 /* default to most commonly used values */
655 diskinfo
[0] = 0x40; /* 1 << 6 */
656 diskinfo
[1] = 0x20; /* 1 << 5 */
657 diskinfo
[2] = sdkp
->capacity
>> 11;
659 /* override with calculated, extended default, or driver values */
660 if (host
->hostt
->bios_param
)
661 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
663 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
665 geo
->heads
= diskinfo
[0];
666 geo
->sectors
= diskinfo
[1];
667 geo
->cylinders
= diskinfo
[2];
672 * sd_ioctl - process an ioctl
673 * @inode: only i_rdev/i_bdev members may be used
674 * @filp: only f_mode and f_flags may be used
675 * @cmd: ioctl command number
676 * @arg: this is third argument given to ioctl(2) system call.
677 * Often contains a pointer.
679 * Returns 0 if successful (some ioctls return postive numbers on
680 * success as well). Returns a negated errno value in case of error.
682 * Note: most ioctls are forward onto the block subsystem or further
683 * down in the scsi subsytem.
685 static int sd_ioctl(struct inode
* inode
, struct file
* filp
,
686 unsigned int cmd
, unsigned long arg
)
688 struct block_device
*bdev
= inode
->i_bdev
;
689 struct gendisk
*disk
= bdev
->bd_disk
;
690 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
691 void __user
*p
= (void __user
*)arg
;
694 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
695 disk
->disk_name
, cmd
));
698 * If we are in the middle of error recovery, don't let anyone
699 * else try and use this device. Also, if error recovery fails, it
700 * may try and take the device offline, in which case all further
701 * access to the device is prohibited.
703 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
, filp
);
704 if (!scsi_block_when_processing_errors(sdp
) || !error
)
708 * Send SCSI addressing ioctls directly to mid level, send other
709 * ioctls to block level and then onto mid level if they can't be
713 case SCSI_IOCTL_GET_IDLUN
:
714 case SCSI_IOCTL_GET_BUS_NUMBER
:
715 return scsi_ioctl(sdp
, cmd
, p
);
717 error
= scsi_cmd_ioctl(filp
, disk
, cmd
, p
);
718 if (error
!= -ENOTTY
)
721 return scsi_ioctl(sdp
, cmd
, p
);
724 static void set_media_not_present(struct scsi_disk
*sdkp
)
726 sdkp
->media_present
= 0;
728 sdkp
->device
->changed
= 1;
732 * sd_media_changed - check if our medium changed
733 * @disk: kernel device descriptor
735 * Returns 0 if not applicable or no change; 1 if change
737 * Note: this function is invoked from the block subsystem.
739 static int sd_media_changed(struct gendisk
*disk
)
741 struct scsi_disk
*sdkp
= scsi_disk(disk
);
742 struct scsi_device
*sdp
= sdkp
->device
;
745 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
751 * If the device is offline, don't send any commands - just pretend as
752 * if the command failed. If the device ever comes back online, we
753 * can deal with it then. It is only because of unrecoverable errors
754 * that we would ever take a device offline in the first place.
756 if (!scsi_device_online(sdp
))
760 * Using TEST_UNIT_READY enables differentiation between drive with
761 * no cartridge loaded - NOT READY, drive with changed cartridge -
762 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
764 * Drives that auto spin down. eg iomega jaz 1G, will be started
765 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
766 * sd_revalidate() is called.
769 if (scsi_block_when_processing_errors(sdp
))
770 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
);
773 * Unable to test, unit probably not ready. This usually
774 * means there is no disc in the drive. Mark as changed,
775 * and we will figure it out later once the drive is
782 * For removable scsi disk we have to recognise the presence
783 * of a disk in the drive. This is kept in the struct scsi_disk
784 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
786 sdkp
->media_present
= 1;
788 retval
= sdp
->changed
;
794 set_media_not_present(sdkp
);
798 static int sd_sync_cache(struct scsi_disk
*sdkp
)
801 struct scsi_device
*sdp
= sdkp
->device
;
802 struct scsi_sense_hdr sshdr
;
804 if (!scsi_device_online(sdp
))
808 for (retries
= 3; retries
> 0; --retries
) {
809 unsigned char cmd
[10] = { 0 };
811 cmd
[0] = SYNCHRONIZE_CACHE
;
813 * Leave the rest of the command zero to indicate
816 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
817 SD_TIMEOUT
, SD_MAX_RETRIES
);
823 sd_print_result(sdkp
, res
);
824 if (driver_byte(res
) & DRIVER_SENSE
)
825 sd_print_sense_hdr(sdkp
, &sshdr
);
833 static int sd_issue_flush(struct device
*dev
, sector_t
*error_sector
)
836 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
842 ret
= sd_sync_cache(sdkp
);
847 static void sd_prepare_flush(request_queue_t
*q
, struct request
*rq
)
849 memset(rq
->cmd
, 0, sizeof(rq
->cmd
));
850 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
851 rq
->timeout
= SD_TIMEOUT
;
852 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
856 static void sd_rescan(struct device
*dev
)
858 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
861 sd_revalidate_disk(sdkp
->disk
);
869 * This gets directly called from VFS. When the ioctl
870 * is not recognized we go back to the other translation paths.
872 static long sd_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
874 struct block_device
*bdev
= file
->f_path
.dentry
->d_inode
->i_bdev
;
875 struct gendisk
*disk
= bdev
->bd_disk
;
876 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
879 * If we are in the middle of error recovery, don't let anyone
880 * else try and use this device. Also, if error recovery fails, it
881 * may try and take the device offline, in which case all further
882 * access to the device is prohibited.
884 if (!scsi_block_when_processing_errors(sdev
))
887 if (sdev
->host
->hostt
->compat_ioctl
) {
890 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
896 * Let the static ioctl translation table take care of it.
902 static struct block_device_operations sd_fops
= {
903 .owner
= THIS_MODULE
,
905 .release
= sd_release
,
909 .compat_ioctl
= sd_compat_ioctl
,
911 .media_changed
= sd_media_changed
,
912 .revalidate_disk
= sd_revalidate_disk
,
916 * sd_rw_intr - bottom half handler: called when the lower level
917 * driver has completed (successfully or otherwise) a scsi command.
918 * @SCpnt: mid-level's per command structure.
920 * Note: potentially run from within an ISR. Must not block.
922 static void sd_rw_intr(struct scsi_cmnd
* SCpnt
)
924 int result
= SCpnt
->result
;
925 unsigned int xfer_size
= SCpnt
->request_bufflen
;
926 unsigned int good_bytes
= result
? 0 : xfer_size
;
927 u64 start_lba
= SCpnt
->request
->sector
;
928 u64 end_lba
= SCpnt
->request
->sector
+ (xfer_size
/ 512);
930 struct scsi_sense_hdr sshdr
;
932 int sense_deferred
= 0;
936 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
938 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
940 #ifdef CONFIG_SCSI_LOGGING
941 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
943 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
944 "sd_rw_intr: sb[respc,sk,asc,"
945 "ascq]=%x,%x,%x,%x\n",
947 sshdr
.sense_key
, sshdr
.asc
,
951 if (driver_byte(result
) != DRIVER_SENSE
&&
952 (!sense_valid
|| sense_deferred
))
955 switch (sshdr
.sense_key
) {
958 if (!blk_fs_request(SCpnt
->request
))
960 info_valid
= scsi_get_sense_info_fld(SCpnt
->sense_buffer
,
961 SCSI_SENSE_BUFFERSIZE
,
965 if (xfer_size
<= SCpnt
->device
->sector_size
)
967 if (SCpnt
->device
->sector_size
< 512) {
968 /* only legitimate sector_size here is 256 */
972 /* be careful ... don't want any overflows */
973 u64 factor
= SCpnt
->device
->sector_size
/ 512;
974 do_div(start_lba
, factor
);
975 do_div(end_lba
, factor
);
978 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
979 /* the bad lba was reported incorrectly, we have
980 * no idea where the error is
984 /* This computation should always be done in terms of
985 * the resolution of the device's medium.
987 good_bytes
= (bad_lba
- start_lba
)*SCpnt
->device
->sector_size
;
989 case RECOVERED_ERROR
:
990 good_bytes
= xfer_size
;
993 /* This indicates a false check condition, so ignore it. An
994 * unknown amount of data was transferred so treat it as an
997 scsi_print_sense("sd", SCpnt
);
999 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1001 case ILLEGAL_REQUEST
:
1002 if (SCpnt
->device
->use_10_for_rw
&&
1003 (SCpnt
->cmnd
[0] == READ_10
||
1004 SCpnt
->cmnd
[0] == WRITE_10
))
1005 SCpnt
->device
->use_10_for_rw
= 0;
1006 if (SCpnt
->device
->use_10_for_ms
&&
1007 (SCpnt
->cmnd
[0] == MODE_SENSE_10
||
1008 SCpnt
->cmnd
[0] == MODE_SELECT_10
))
1009 SCpnt
->device
->use_10_for_ms
= 0;
1015 scsi_io_completion(SCpnt
, good_bytes
);
1018 static int media_not_present(struct scsi_disk
*sdkp
,
1019 struct scsi_sense_hdr
*sshdr
)
1022 if (!scsi_sense_valid(sshdr
))
1024 /* not invoked for commands that could return deferred errors */
1025 if (sshdr
->sense_key
!= NOT_READY
&&
1026 sshdr
->sense_key
!= UNIT_ATTENTION
)
1028 if (sshdr
->asc
!= 0x3A) /* medium not present */
1031 set_media_not_present(sdkp
);
1036 * spinup disk - called only in sd_revalidate_disk()
1039 sd_spinup_disk(struct scsi_disk
*sdkp
)
1041 unsigned char cmd
[10];
1042 unsigned long spintime_expire
= 0;
1043 int retries
, spintime
;
1044 unsigned int the_result
;
1045 struct scsi_sense_hdr sshdr
;
1046 int sense_valid
= 0;
1050 /* Spin up drives, as required. Only do this at boot time */
1051 /* Spinup needs to be done for module loads too. */
1056 cmd
[0] = TEST_UNIT_READY
;
1057 memset((void *) &cmd
[1], 0, 9);
1059 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1065 * If the drive has indicated to us that it
1066 * doesn't have any media in it, don't bother
1067 * with any more polling.
1069 if (media_not_present(sdkp
, &sshdr
))
1073 sense_valid
= scsi_sense_valid(&sshdr
);
1075 } while (retries
< 3 &&
1076 (!scsi_status_is_good(the_result
) ||
1077 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1078 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1080 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1081 /* no sense, TUR either succeeded or failed
1082 * with a status error */
1083 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1084 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1085 sd_print_result(sdkp
, the_result
);
1091 * The device does not want the automatic start to be issued.
1093 if (sdkp
->device
->no_start_on_add
)
1096 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1097 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1098 break; /* manual intervention required */
1099 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1100 break; /* standby */
1101 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1102 break; /* unavailable */
1104 * Issue command to spin up drive when not ready
1107 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1108 cmd
[0] = START_STOP
;
1109 cmd
[1] = 1; /* Return immediately */
1110 memset((void *) &cmd
[2], 0, 8);
1111 cmd
[4] = 1; /* Start spin cycle */
1112 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1114 SD_TIMEOUT
, SD_MAX_RETRIES
);
1115 spintime_expire
= jiffies
+ 100 * HZ
;
1118 /* Wait 1 second for next try */
1123 * Wait for USB flash devices with slow firmware.
1124 * Yes, this sense key/ASC combination shouldn't
1125 * occur here. It's characteristic of these devices.
1127 } else if (sense_valid
&&
1128 sshdr
.sense_key
== UNIT_ATTENTION
&&
1129 sshdr
.asc
== 0x28) {
1131 spintime_expire
= jiffies
+ 5 * HZ
;
1134 /* Wait 1 second for next try */
1137 /* we don't understand the sense code, so it's
1138 * probably pointless to loop */
1140 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1141 sd_print_sense_hdr(sdkp
, &sshdr
);
1146 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1149 if (scsi_status_is_good(the_result
))
1152 printk("not responding...\n");
1157 * read disk capacity
1160 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1162 unsigned char cmd
[16];
1163 int the_result
, retries
;
1164 int sector_size
= 0;
1166 struct scsi_sense_hdr sshdr
;
1167 int sense_valid
= 0;
1168 struct scsi_device
*sdp
= sdkp
->device
;
1169 sector_t old_capacity
= sdkp
->capacity
;
1175 memset((void *) cmd
, 0, 16);
1176 cmd
[0] = SERVICE_ACTION_IN
;
1177 cmd
[1] = SAI_READ_CAPACITY_16
;
1179 memset((void *) buffer
, 0, 12);
1181 cmd
[0] = READ_CAPACITY
;
1182 memset((void *) &cmd
[1], 0, 9);
1183 memset((void *) buffer
, 0, 8);
1186 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1187 buffer
, longrc
? 12 : 8, &sshdr
,
1188 SD_TIMEOUT
, SD_MAX_RETRIES
);
1190 if (media_not_present(sdkp
, &sshdr
))
1194 sense_valid
= scsi_sense_valid(&sshdr
);
1197 } while (the_result
&& retries
);
1199 if (the_result
&& !longrc
) {
1200 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1201 sd_print_result(sdkp
, the_result
);
1202 if (driver_byte(the_result
) & DRIVER_SENSE
)
1203 sd_print_sense_hdr(sdkp
, &sshdr
);
1205 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1207 /* Set dirty bit for removable devices if not ready -
1208 * sometimes drives will not report this properly. */
1209 if (sdp
->removable
&&
1210 sense_valid
&& sshdr
.sense_key
== NOT_READY
)
1213 /* Either no media are present but the drive didn't tell us,
1214 or they are present but the read capacity command fails */
1215 /* sdkp->media_present = 0; -- not always correct */
1216 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1219 } else if (the_result
&& longrc
) {
1220 /* READ CAPACITY(16) has been failed */
1221 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1222 sd_print_result(sdkp
, the_result
);
1223 sd_printk(KERN_NOTICE
, sdkp
, "Use 0xffffffff as device size\n");
1225 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1230 sector_size
= get_unaligned_be32(&buffer
[4]);
1231 if (buffer
[0] == 0xff && buffer
[1] == 0xff &&
1232 buffer
[2] == 0xff && buffer
[3] == 0xff) {
1233 if(sizeof(sdkp
->capacity
) > 4) {
1234 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1235 "Trying to use READ CAPACITY(16).\n");
1239 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use "
1240 "a kernel compiled with support for large "
1241 "block devices.\n");
1245 sdkp
->capacity
= 1 + (sector_t
)get_unaligned_be32(&buffer
[0]);
1247 sdkp
->capacity
= 1 + get_unaligned_be64(&buffer
[0]);
1249 sector_size
= get_unaligned_be32(&buffer
[8]);
1252 /* Some devices are known to return the total number of blocks,
1253 * not the highest block number. Some devices have versions
1254 * which do this and others which do not. Some devices we might
1255 * suspect of doing this but we don't know for certain.
1257 * If we know the reported capacity is wrong, decrement it. If
1258 * we can only guess, then assume the number of blocks is even
1259 * (usually true but not always) and err on the side of lowering
1262 if (sdp
->fix_capacity
||
1263 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1264 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1265 "from its reported value: %llu\n",
1266 (unsigned long long) sdkp
->capacity
);
1271 if (sector_size
== 0) {
1273 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1277 if (sector_size
!= 512 &&
1278 sector_size
!= 1024 &&
1279 sector_size
!= 2048 &&
1280 sector_size
!= 4096 &&
1281 sector_size
!= 256) {
1282 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1285 * The user might want to re-format the drive with
1286 * a supported sectorsize. Once this happens, it
1287 * would be relatively trivial to set the thing up.
1288 * For this reason, we leave the thing in the table.
1292 * set a bogus sector size so the normal read/write
1293 * logic in the block layer will eventually refuse any
1294 * request on this device without tripping over power
1295 * of two sector size assumptions
1301 * The msdos fs needs to know the hardware sector size
1302 * So I have created this table. See ll_rw_blk.c
1303 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1305 int hard_sector
= sector_size
;
1306 sector_t sz
= (sdkp
->capacity
/2) * (hard_sector
/256);
1307 request_queue_t
*queue
= sdp
->request_queue
;
1310 blk_queue_hardsect_size(queue
, hard_sector
);
1311 /* avoid 64-bit division on 32-bit platforms */
1312 sector_div(sz
, 625);
1314 sector_div(mb
, 1950);
1316 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
)
1317 sd_printk(KERN_NOTICE
, sdkp
,
1318 "%llu %d-byte hardware sectors (%llu MB)\n",
1319 (unsigned long long)sdkp
->capacity
,
1320 hard_sector
, (unsigned long long)mb
);
1323 /* Rescale capacity to 512-byte units */
1324 if (sector_size
== 4096)
1325 sdkp
->capacity
<<= 3;
1326 else if (sector_size
== 2048)
1327 sdkp
->capacity
<<= 2;
1328 else if (sector_size
== 1024)
1329 sdkp
->capacity
<<= 1;
1330 else if (sector_size
== 256)
1331 sdkp
->capacity
>>= 1;
1333 sdkp
->device
->sector_size
= sector_size
;
1336 /* called with buffer of length 512 */
1338 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1339 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1340 struct scsi_sense_hdr
*sshdr
)
1342 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1343 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1348 * read write protect setting, if possible - called only in sd_revalidate_disk()
1349 * called with buffer of length SD_BUF_SIZE
1352 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1355 struct scsi_device
*sdp
= sdkp
->device
;
1356 struct scsi_mode_data data
;
1357 int old_wp
= sdkp
->write_prot
;
1359 set_disk_ro(sdkp
->disk
, 0);
1360 if (sdp
->skip_ms_page_3f
) {
1361 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1365 if (sdp
->use_192_bytes_for_3f
) {
1366 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1369 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1370 * We have to start carefully: some devices hang if we ask
1371 * for more than is available.
1373 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1376 * Second attempt: ask for page 0 When only page 0 is
1377 * implemented, a request for page 3F may return Sense Key
1378 * 5: Illegal Request, Sense Code 24: Invalid field in
1381 if (!scsi_status_is_good(res
))
1382 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1385 * Third attempt: ask 255 bytes, as we did earlier.
1387 if (!scsi_status_is_good(res
))
1388 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1392 if (!scsi_status_is_good(res
)) {
1393 sd_printk(KERN_WARNING
, sdkp
,
1394 "Test WP failed, assume Write Enabled\n");
1396 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1397 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1398 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
1399 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1400 sdkp
->write_prot
? "on" : "off");
1401 sd_printk(KERN_DEBUG
, sdkp
,
1402 "Mode Sense: %02x %02x %02x %02x\n",
1403 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1409 * sd_read_cache_type - called only from sd_revalidate_disk()
1410 * called with buffer of length SD_BUF_SIZE
1413 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1416 struct scsi_device
*sdp
= sdkp
->device
;
1417 int old_wce
= sdkp
->WCE
;
1418 int old_rcd
= sdkp
->RCD
;
1419 int old_dpofua
= sdkp
->DPOFUA
;
1423 struct scsi_mode_data data
;
1424 struct scsi_sense_hdr sshdr
;
1426 if (sdp
->skip_ms_page_8
)
1429 if (sdp
->type
== TYPE_RBC
) {
1437 /* cautiously ask */
1438 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1440 if (!scsi_status_is_good(res
))
1443 if (!data
.header_length
) {
1445 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1448 /* that went OK, now ask for the proper length */
1452 * We're only interested in the first three bytes, actually.
1453 * But the data cache page is defined for the first 20.
1460 /* Take headers and block descriptors into account */
1461 len
+= data
.header_length
+ data
.block_descriptor_length
;
1462 if (len
> SD_BUF_SIZE
)
1466 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1468 if (scsi_status_is_good(res
)) {
1469 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1471 if (offset
>= SD_BUF_SIZE
- 2) {
1472 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1476 if ((buffer
[offset
] & 0x3f) != modepage
) {
1477 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1481 if (modepage
== 8) {
1482 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1483 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1485 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1489 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1490 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1491 sd_printk(KERN_NOTICE
, sdkp
,
1492 "Uses READ/WRITE(6), disabling FUA\n");
1496 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
1497 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
1498 sd_printk(KERN_NOTICE
, sdkp
,
1499 "Write cache: %s, read cache: %s, %s\n",
1500 sdkp
->WCE
? "enabled" : "disabled",
1501 sdkp
->RCD
? "disabled" : "enabled",
1502 sdkp
->DPOFUA
? "supports DPO and FUA"
1503 : "doesn't support DPO or FUA");
1509 if (scsi_sense_valid(&sshdr
) &&
1510 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1511 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1512 /* Invalid field in CDB */
1513 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1515 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1518 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1525 * sd_revalidate_disk - called the first time a new disk is seen,
1526 * performs disk spin up, read_capacity, etc.
1527 * @disk: struct gendisk we care about
1529 static int sd_revalidate_disk(struct gendisk
*disk
)
1531 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1532 struct scsi_device
*sdp
= sdkp
->device
;
1533 unsigned char *buffer
;
1536 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
1537 "sd_revalidate_disk\n"));
1540 * If the device is offline, don't try and read capacity or any
1541 * of the other niceties.
1543 if (!scsi_device_online(sdp
))
1546 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
1548 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
1549 "allocation failure.\n");
1553 sd_spinup_disk(sdkp
);
1556 * Without media there is no reason to ask; moreover, some devices
1557 * react badly if we do.
1559 if (sdkp
->media_present
) {
1560 sd_read_capacity(sdkp
, buffer
);
1561 sd_read_write_protect_flag(sdkp
, buffer
);
1562 sd_read_cache_type(sdkp
, buffer
);
1565 sdkp
->first_scan
= 0;
1568 * We now have all cache related info, determine how we deal
1569 * with ordered requests. Note that as the current SCSI
1570 * dispatch function can alter request order, we cannot use
1571 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1574 ordered
= sdkp
->DPOFUA
1575 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
1577 ordered
= QUEUE_ORDERED_DRAIN
;
1579 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
1581 set_capacity(disk
, sdkp
->capacity
);
1589 * sd_probe - called during driver initialization and whenever a
1590 * new scsi device is attached to the system. It is called once
1591 * for each scsi device (not just disks) present.
1592 * @dev: pointer to device object
1594 * Returns 0 if successful (or not interested in this scsi device
1595 * (e.g. scanner)); 1 when there is an error.
1597 * Note: this function is invoked from the scsi mid-level.
1598 * This function sets up the mapping between a given
1599 * <host,channel,id,lun> (found in sdp) and new device name
1600 * (e.g. /dev/sda). More precisely it is the block device major
1601 * and minor number that is chosen here.
1603 * Assume sd_attach is not re-entrant (for time being)
1604 * Also think about sd_attach() and sd_remove() running coincidentally.
1606 static int sd_probe(struct device
*dev
)
1608 struct scsi_device
*sdp
= to_scsi_device(dev
);
1609 struct scsi_disk
*sdkp
;
1615 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
1618 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
1622 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
1626 gd
= alloc_disk(16);
1631 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
1634 error
= ida_get_new(&sd_index_ida
, &index
);
1635 } while (error
== -EAGAIN
);
1641 if (index
>= SD_MAX_DISKS
)
1642 goto out_free_index
;
1645 sdkp
->driver
= &sd_template
;
1647 sdkp
->index
= index
;
1650 if (!sdp
->timeout
) {
1651 if (sdp
->type
!= TYPE_MOD
)
1652 sdp
->timeout
= SD_TIMEOUT
;
1654 sdp
->timeout
= SD_MOD_TIMEOUT
;
1657 class_device_initialize(&sdkp
->cdev
);
1658 sdkp
->cdev
.dev
= &sdp
->sdev_gendev
;
1659 sdkp
->cdev
.class = &sd_disk_class
;
1660 strncpy(sdkp
->cdev
.class_id
, sdp
->sdev_gendev
.bus_id
, BUS_ID_SIZE
);
1662 if (class_device_add(&sdkp
->cdev
))
1663 goto out_free_index
;
1665 get_device(&sdp
->sdev_gendev
);
1667 gd
->major
= sd_major((index
& 0xf0) >> 4);
1668 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
1670 gd
->fops
= &sd_fops
;
1673 sprintf(gd
->disk_name
, "sd%c", 'a' + index
% 26);
1674 } else if (index
< (26 + 1) * 26) {
1675 sprintf(gd
->disk_name
, "sd%c%c",
1676 'a' + index
/ 26 - 1,'a' + index
% 26);
1678 const unsigned int m1
= (index
/ 26 - 1) / 26 - 1;
1679 const unsigned int m2
= (index
/ 26 - 1) % 26;
1680 const unsigned int m3
= index
% 26;
1681 sprintf(gd
->disk_name
, "sd%c%c%c",
1682 'a' + m1
, 'a' + m2
, 'a' + m3
);
1685 gd
->private_data
= &sdkp
->driver
;
1686 gd
->queue
= sdkp
->device
->request_queue
;
1688 /* defaults, until the device tells us otherwise */
1689 sdp
->sector_size
= 512;
1691 sdkp
->media_present
= 1;
1692 sdkp
->write_prot
= 0;
1695 sdkp
->first_scan
= 1;
1697 sd_revalidate_disk(gd
);
1699 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
1700 gd
->flags
= GENHD_FL_DRIVERFS
;
1702 gd
->flags
|= GENHD_FL_REMOVABLE
;
1704 dev_set_drvdata(dev
, sdkp
);
1707 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
1708 sdp
->removable
? "removable " : "");
1713 ida_remove(&sd_index_ida
, index
);
1723 * sd_remove - called whenever a scsi disk (previously recognized by
1724 * sd_probe) is detached from the system. It is called (potentially
1725 * multiple times) during sd module unload.
1726 * @sdp: pointer to mid level scsi device object
1728 * Note: this function is invoked from the scsi mid-level.
1729 * This function potentially frees up a device name (e.g. /dev/sdc)
1730 * that could be re-used by a subsequent sd_probe().
1731 * This function is not called when the built-in sd driver is "exit-ed".
1733 static int sd_remove(struct device
*dev
)
1735 struct scsi_disk
*sdkp
= dev_get_drvdata(dev
);
1737 class_device_del(&sdkp
->cdev
);
1738 del_gendisk(sdkp
->disk
);
1741 mutex_lock(&sd_ref_mutex
);
1742 dev_set_drvdata(dev
, NULL
);
1743 class_device_put(&sdkp
->cdev
);
1744 mutex_unlock(&sd_ref_mutex
);
1750 * scsi_disk_release - Called to free the scsi_disk structure
1751 * @cdev: pointer to embedded class device
1753 * sd_ref_mutex must be held entering this routine. Because it is
1754 * called on last put, you should always use the scsi_disk_get()
1755 * scsi_disk_put() helpers which manipulate the semaphore directly
1756 * and never do a direct class_device_put().
1758 static void scsi_disk_release(struct class_device
*cdev
)
1760 struct scsi_disk
*sdkp
= to_scsi_disk(cdev
);
1761 struct gendisk
*disk
= sdkp
->disk
;
1763 ida_remove(&sd_index_ida
, sdkp
->index
);
1765 disk
->private_data
= NULL
;
1767 put_device(&sdkp
->device
->sdev_gendev
);
1772 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
1774 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
1775 struct scsi_sense_hdr sshdr
;
1776 struct scsi_device
*sdp
= sdkp
->device
;
1780 cmd
[4] |= 1; /* START */
1782 if (!scsi_device_online(sdp
))
1785 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1786 SD_TIMEOUT
, SD_MAX_RETRIES
);
1788 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
1789 sd_print_result(sdkp
, res
);
1790 if (driver_byte(res
) & DRIVER_SENSE
)
1791 sd_print_sense_hdr(sdkp
, &sshdr
);
1798 * Send a SYNCHRONIZE CACHE instruction down to the device through
1799 * the normal SCSI command structure. Wait for the command to
1802 static void sd_shutdown(struct device
*dev
)
1804 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1807 return; /* this can happen */
1810 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1811 sd_sync_cache(sdkp
);
1814 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
1815 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1816 sd_start_stop_device(sdkp
, 0);
1819 scsi_disk_put(sdkp
);
1822 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
1824 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1828 return 0; /* this can happen */
1831 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
1832 ret
= sd_sync_cache(sdkp
);
1837 if (mesg
.event
== PM_EVENT_SUSPEND
&&
1838 sdkp
->device
->manage_start_stop
) {
1839 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
1840 ret
= sd_start_stop_device(sdkp
, 0);
1844 scsi_disk_put(sdkp
);
1848 static int sd_resume(struct device
*dev
)
1850 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1853 if (!sdkp
->device
->manage_start_stop
)
1856 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
1857 ret
= sd_start_stop_device(sdkp
, 1);
1860 scsi_disk_put(sdkp
);
1865 * init_sd - entry point for this driver (both when built in or when
1868 * Note: this function registers this driver with the scsi mid-level.
1870 static int __init
init_sd(void)
1872 int majors
= 0, i
, err
;
1874 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1876 for (i
= 0; i
< SD_MAJORS
; i
++)
1877 if (register_blkdev(sd_major(i
), "sd") == 0)
1883 err
= class_register(&sd_disk_class
);
1887 err
= scsi_register_driver(&sd_template
.gendrv
);
1894 class_unregister(&sd_disk_class
);
1896 for (i
= 0; i
< SD_MAJORS
; i
++)
1897 unregister_blkdev(sd_major(i
), "sd");
1902 * exit_sd - exit point for this driver (when it is a module).
1904 * Note: this function unregisters this driver from the scsi mid-level.
1906 static void __exit
exit_sd(void)
1910 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1912 scsi_unregister_driver(&sd_template
.gendrv
);
1913 class_unregister(&sd_disk_class
);
1915 for (i
= 0; i
< SD_MAJORS
; i
++)
1916 unregister_blkdev(sd_major(i
), "sd");
1919 module_init(init_sd
);
1920 module_exit(exit_sd
);
1922 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
1923 struct scsi_sense_hdr
*sshdr
)
1925 sd_printk(KERN_INFO
, sdkp
, "");
1926 scsi_show_sense_hdr(sshdr
);
1927 sd_printk(KERN_INFO
, sdkp
, "");
1928 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
1931 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
1933 sd_printk(KERN_INFO
, sdkp
, "");
1934 scsi_show_result(result
);