2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
35 #include <linux/module.h>
37 #include <linux/kernel.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <asm/uaccess.h>
54 #include <asm/unaligned.h>
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_cmnd.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h>
64 #include <scsi/scsicam.h>
67 #include "scsi_logging.h"
69 MODULE_AUTHOR("Eric Youngdale");
70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
71 MODULE_LICENSE("GPL");
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
99 static int sd_revalidate_disk(struct gendisk
*);
100 static int sd_probe(struct device
*);
101 static int sd_remove(struct device
*);
102 static void sd_shutdown(struct device
*);
103 static int sd_suspend(struct device
*, pm_message_t state
);
104 static int sd_resume(struct device
*);
105 static void sd_rescan(struct device
*);
106 static int sd_done(struct scsi_cmnd
*);
107 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
108 static void scsi_disk_release(struct device
*cdev
);
109 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
110 static void sd_print_result(struct scsi_disk
*, int);
112 static DEFINE_SPINLOCK(sd_index_lock
);
113 static DEFINE_IDA(sd_index_ida
);
115 /* This semaphore is used to mediate the 0->1 reference get in the
116 * face of object destruction (i.e. we can't allow a get on an
117 * object after last put) */
118 static DEFINE_MUTEX(sd_ref_mutex
);
120 struct kmem_cache
*sd_cdb_cache
;
121 mempool_t
*sd_cdb_pool
;
123 static const char *sd_cache_types
[] = {
124 "write through", "none", "write back",
125 "write back, no read (daft)"
129 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
130 const char *buf
, size_t count
)
132 int i
, ct
= -1, rcd
, wce
, sp
;
133 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
134 struct scsi_device
*sdp
= sdkp
->device
;
137 struct scsi_mode_data data
;
138 struct scsi_sense_hdr sshdr
;
141 if (sdp
->type
!= TYPE_DISK
)
142 /* no cache control on RBC devices; theoretically they
143 * can do it, but there's probably so many exceptions
144 * it's not worth the risk */
147 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
148 const int len
= strlen(sd_cache_types
[i
]);
149 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
157 rcd
= ct
& 0x01 ? 1 : 0;
158 wce
= ct
& 0x02 ? 1 : 0;
159 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
160 SD_MAX_RETRIES
, &data
, NULL
))
162 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
163 data
.block_descriptor_length
);
164 buffer_data
= buffer
+ data
.header_length
+
165 data
.block_descriptor_length
;
166 buffer_data
[2] &= ~0x05;
167 buffer_data
[2] |= wce
<< 2 | rcd
;
168 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
170 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
171 SD_MAX_RETRIES
, &data
, &sshdr
)) {
172 if (scsi_sense_valid(&sshdr
))
173 sd_print_sense_hdr(sdkp
, &sshdr
);
176 revalidate_disk(sdkp
->disk
);
181 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
182 const char *buf
, size_t count
)
184 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
185 struct scsi_device
*sdp
= sdkp
->device
;
187 if (!capable(CAP_SYS_ADMIN
))
190 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
196 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
197 const char *buf
, size_t count
)
199 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
200 struct scsi_device
*sdp
= sdkp
->device
;
202 if (!capable(CAP_SYS_ADMIN
))
205 if (sdp
->type
!= TYPE_DISK
)
208 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
214 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
217 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
218 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
220 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
224 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
226 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
228 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
232 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
235 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
236 struct scsi_device
*sdp
= sdkp
->device
;
238 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
242 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
245 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
247 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
251 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
254 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
256 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
260 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
263 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
265 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
269 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
272 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
274 return snprintf(buf
, 20, "%u\n", sdkp
->thin_provisioning
);
277 static struct device_attribute sd_disk_attrs
[] = {
278 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
279 sd_store_cache_type
),
280 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
281 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
282 sd_store_allow_restart
),
283 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
284 sd_store_manage_start_stop
),
285 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
286 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
287 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
291 static struct class sd_disk_class
= {
293 .owner
= THIS_MODULE
,
294 .dev_release
= scsi_disk_release
,
295 .dev_attrs
= sd_disk_attrs
,
298 static struct scsi_driver sd_template
= {
299 .owner
= THIS_MODULE
,
304 .suspend
= sd_suspend
,
306 .shutdown
= sd_shutdown
,
313 * Device no to disk mapping:
315 * major disc2 disc p1
316 * |............|.............|....|....| <- dev_t
319 * Inside a major, we have 16k disks, however mapped non-
320 * contiguously. The first 16 disks are for major0, the next
321 * ones with major1, ... Disk 256 is for major0 again, disk 272
323 * As we stay compatible with our numbering scheme, we can reuse
324 * the well-know SCSI majors 8, 65--71, 136--143.
326 static int sd_major(int major_idx
)
330 return SCSI_DISK0_MAJOR
;
332 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
334 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
337 return 0; /* shut up gcc */
341 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
343 struct scsi_disk
*sdkp
= NULL
;
345 if (disk
->private_data
) {
346 sdkp
= scsi_disk(disk
);
347 if (scsi_device_get(sdkp
->device
) == 0)
348 get_device(&sdkp
->dev
);
355 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
357 struct scsi_disk
*sdkp
;
359 mutex_lock(&sd_ref_mutex
);
360 sdkp
= __scsi_disk_get(disk
);
361 mutex_unlock(&sd_ref_mutex
);
365 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
367 struct scsi_disk
*sdkp
;
369 mutex_lock(&sd_ref_mutex
);
370 sdkp
= dev_get_drvdata(dev
);
372 sdkp
= __scsi_disk_get(sdkp
->disk
);
373 mutex_unlock(&sd_ref_mutex
);
377 static void scsi_disk_put(struct scsi_disk
*sdkp
)
379 struct scsi_device
*sdev
= sdkp
->device
;
381 mutex_lock(&sd_ref_mutex
);
382 put_device(&sdkp
->dev
);
383 scsi_device_put(sdev
);
384 mutex_unlock(&sd_ref_mutex
);
387 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
389 unsigned int prot_op
= SCSI_PROT_NORMAL
;
390 unsigned int dix
= scsi_prot_sg_count(scmd
);
392 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
394 prot_op
= SCSI_PROT_READ_PASS
;
395 else if (dif
&& !dix
)
396 prot_op
= SCSI_PROT_READ_STRIP
;
397 else if (!dif
&& dix
)
398 prot_op
= SCSI_PROT_READ_INSERT
;
401 prot_op
= SCSI_PROT_WRITE_PASS
;
402 else if (dif
&& !dix
)
403 prot_op
= SCSI_PROT_WRITE_INSERT
;
404 else if (!dif
&& dix
)
405 prot_op
= SCSI_PROT_WRITE_STRIP
;
408 scsi_set_prot_op(scmd
, prot_op
);
409 scsi_set_prot_type(scmd
, dif
);
413 * sd_prepare_discard - unmap blocks on thinly provisioned device
414 * @rq: Request to prepare
416 * Will issue either UNMAP or WRITE SAME(16) depending on preference
417 * indicated by target device.
419 static int sd_prepare_discard(struct request
*rq
)
421 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
422 struct bio
*bio
= rq
->bio
;
423 sector_t sector
= bio
->bi_sector
;
424 unsigned int num
= bio_sectors(bio
);
426 if (sdkp
->device
->sector_size
== 4096) {
431 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
432 rq
->timeout
= SD_TIMEOUT
;
434 memset(rq
->cmd
, 0, rq
->cmd_len
);
437 char *buf
= kmap_atomic(bio_page(bio
), KM_USER0
);
443 /* Ensure that data length matches payload */
444 rq
->__data_len
= bio
->bi_size
= bio
->bi_io_vec
->bv_len
= 24;
446 put_unaligned_be16(6 + 16, &buf
[0]);
447 put_unaligned_be16(16, &buf
[2]);
448 put_unaligned_be64(sector
, &buf
[8]);
449 put_unaligned_be32(num
, &buf
[16]);
451 kunmap_atomic(buf
, KM_USER0
);
453 rq
->cmd
[0] = WRITE_SAME_16
;
454 rq
->cmd
[1] = 0x8; /* UNMAP */
455 put_unaligned_be64(sector
, &rq
->cmd
[2]);
456 put_unaligned_be32(num
, &rq
->cmd
[10]);
464 * sd_init_command - build a scsi (read or write) command from
465 * information in the request structure.
466 * @SCpnt: pointer to mid-level's per scsi command structure that
467 * contains request and into which the scsi command is written
469 * Returns 1 if successful and 0 if error (or cannot be done now).
471 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
473 struct scsi_cmnd
*SCpnt
;
474 struct scsi_device
*sdp
= q
->queuedata
;
475 struct gendisk
*disk
= rq
->rq_disk
;
476 struct scsi_disk
*sdkp
;
477 sector_t block
= blk_rq_pos(rq
);
479 unsigned int this_count
= blk_rq_sectors(rq
);
481 unsigned char protect
;
484 * Discard request come in as REQ_TYPE_FS but we turn them into
485 * block PC requests to make life easier.
487 if (blk_discard_rq(rq
))
488 ret
= sd_prepare_discard(rq
);
490 if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
491 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
493 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
497 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
498 if (ret
!= BLKPREP_OK
)
501 sdkp
= scsi_disk(disk
);
503 /* from here on until we're complete, any goto out
504 * is used for a killable error condition */
507 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
508 "sd_init_command: block=%llu, "
510 (unsigned long long)block
,
513 if (!sdp
|| !scsi_device_online(sdp
) ||
514 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
515 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
516 "Finishing %u sectors\n",
517 blk_rq_sectors(rq
)));
518 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
519 "Retry with 0x%p\n", SCpnt
));
525 * quietly refuse to do anything to a changed disc until
526 * the changed bit has been reset
528 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
533 * Some SD card readers can't handle multi-sector accesses which touch
534 * the last one or two hardware sectors. Split accesses as needed.
536 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
537 (sdp
->sector_size
/ 512);
539 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
540 if (block
< threshold
) {
541 /* Access up to the threshold but not beyond */
542 this_count
= threshold
- block
;
544 /* Access only a single hardware sector */
545 this_count
= sdp
->sector_size
/ 512;
549 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
550 (unsigned long long)block
));
553 * If we have a 1K hardware sectorsize, prevent access to single
554 * 512 byte sectors. In theory we could handle this - in fact
555 * the scsi cdrom driver must be able to handle this because
556 * we typically use 1K blocksizes, and cdroms typically have
557 * 2K hardware sectorsizes. Of course, things are simpler
558 * with the cdrom, since it is read-only. For performance
559 * reasons, the filesystems should be able to handle this
560 * and not force the scsi disk driver to use bounce buffers
563 if (sdp
->sector_size
== 1024) {
564 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
565 scmd_printk(KERN_ERR
, SCpnt
,
566 "Bad block number requested\n");
570 this_count
= this_count
>> 1;
573 if (sdp
->sector_size
== 2048) {
574 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
575 scmd_printk(KERN_ERR
, SCpnt
,
576 "Bad block number requested\n");
580 this_count
= this_count
>> 2;
583 if (sdp
->sector_size
== 4096) {
584 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
585 scmd_printk(KERN_ERR
, SCpnt
,
586 "Bad block number requested\n");
590 this_count
= this_count
>> 3;
593 if (rq_data_dir(rq
) == WRITE
) {
594 if (!sdp
->writeable
) {
597 SCpnt
->cmnd
[0] = WRITE_6
;
598 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
600 if (blk_integrity_rq(rq
) &&
601 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
604 } else if (rq_data_dir(rq
) == READ
) {
605 SCpnt
->cmnd
[0] = READ_6
;
606 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
608 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
612 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
613 "%s %d/%u 512 byte blocks.\n",
614 (rq_data_dir(rq
) == WRITE
) ?
615 "writing" : "reading", this_count
,
616 blk_rq_sectors(rq
)));
618 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
619 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
625 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
626 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
628 if (unlikely(SCpnt
->cmnd
== NULL
)) {
633 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
634 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
635 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
636 SCpnt
->cmnd
[7] = 0x18;
637 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
638 SCpnt
->cmnd
[10] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
641 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
642 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
643 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
644 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
645 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
646 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
647 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
648 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
650 /* Expected Indirect LBA */
651 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
652 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
653 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
654 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
656 /* Transfer length */
657 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
658 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
659 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
660 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
661 } else if (block
> 0xffffffff) {
662 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
663 SCpnt
->cmnd
[1] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
664 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
665 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
666 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
667 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
668 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
669 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
670 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
671 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
672 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
673 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
674 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
675 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
676 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
677 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
678 scsi_device_protection(SCpnt
->device
) ||
679 SCpnt
->device
->use_10_for_rw
) {
680 if (this_count
> 0xffff)
683 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
684 SCpnt
->cmnd
[1] = protect
| (blk_fua_rq(rq
) ? 0x8 : 0);
685 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
686 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
687 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
688 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
689 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
690 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
691 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
693 if (unlikely(blk_fua_rq(rq
))) {
695 * This happens only if this drive failed
696 * 10byte rw command with ILLEGAL_REQUEST
697 * during operation and thus turned off
700 scmd_printk(KERN_ERR
, SCpnt
,
701 "FUA write on READ/WRITE(6) drive\n");
705 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
706 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
707 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
708 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
711 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
713 /* If DIF or DIX is enabled, tell HBA how to handle request */
714 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
715 sd_prot_op(SCpnt
, host_dif
);
718 * We shouldn't disconnect in the middle of a sector, so with a dumb
719 * host adapter, it's safe to assume that we can at least transfer
720 * this many bytes between each connect / disconnect.
722 SCpnt
->transfersize
= sdp
->sector_size
;
723 SCpnt
->underflow
= this_count
<< 9;
724 SCpnt
->allowed
= SD_MAX_RETRIES
;
727 * This indicates that the command is ready from our end to be
732 return scsi_prep_return(q
, rq
, ret
);
736 * sd_open - open a scsi disk device
737 * @inode: only i_rdev member may be used
738 * @filp: only f_mode and f_flags may be used
740 * Returns 0 if successful. Returns a negated errno value in case
743 * Note: This can be called from a user context (e.g. fsck(1) )
744 * or from within the kernel (e.g. as a result of a mount(1) ).
745 * In the latter case @inode and @filp carry an abridged amount
746 * of information as noted above.
748 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
750 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
751 struct scsi_device
*sdev
;
757 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
762 * If the device is in error recovery, wait until it is done.
763 * If the device is offline, then disallow any access to it.
766 if (!scsi_block_when_processing_errors(sdev
))
769 if (sdev
->removable
|| sdkp
->write_prot
)
770 check_disk_change(bdev
);
773 * If the drive is empty, just let the open fail.
776 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
780 * If the device has the write protect tab set, have the open fail
781 * if the user expects to be able to write to the thing.
784 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
788 * It is possible that the disk changing stuff resulted in
789 * the device being taken offline. If this is the case,
790 * report this to the user, and don't pretend that the
791 * open actually succeeded.
794 if (!scsi_device_online(sdev
))
797 if (!sdkp
->openers
++ && sdev
->removable
) {
798 if (scsi_block_when_processing_errors(sdev
))
799 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
810 * sd_release - invoked when the (last) close(2) is called on this
812 * @inode: only i_rdev member may be used
813 * @filp: only f_mode and f_flags may be used
817 * Note: may block (uninterruptible) if error recovery is underway
820 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
822 struct scsi_disk
*sdkp
= scsi_disk(disk
);
823 struct scsi_device
*sdev
= sdkp
->device
;
825 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
827 if (!--sdkp
->openers
&& sdev
->removable
) {
828 if (scsi_block_when_processing_errors(sdev
))
829 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
833 * XXX and what if there are packets in flight and this close()
834 * XXX is followed by a "rmmod sd_mod"?
840 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
842 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
843 struct scsi_device
*sdp
= sdkp
->device
;
844 struct Scsi_Host
*host
= sdp
->host
;
847 /* default to most commonly used values */
848 diskinfo
[0] = 0x40; /* 1 << 6 */
849 diskinfo
[1] = 0x20; /* 1 << 5 */
850 diskinfo
[2] = sdkp
->capacity
>> 11;
852 /* override with calculated, extended default, or driver values */
853 if (host
->hostt
->bios_param
)
854 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
856 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
858 geo
->heads
= diskinfo
[0];
859 geo
->sectors
= diskinfo
[1];
860 geo
->cylinders
= diskinfo
[2];
865 * sd_ioctl - process an ioctl
866 * @inode: only i_rdev/i_bdev members may be used
867 * @filp: only f_mode and f_flags may be used
868 * @cmd: ioctl command number
869 * @arg: this is third argument given to ioctl(2) system call.
870 * Often contains a pointer.
872 * Returns 0 if successful (some ioctls return postive numbers on
873 * success as well). Returns a negated errno value in case of error.
875 * Note: most ioctls are forward onto the block subsystem or further
876 * down in the scsi subsystem.
878 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
879 unsigned int cmd
, unsigned long arg
)
881 struct gendisk
*disk
= bdev
->bd_disk
;
882 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
883 void __user
*p
= (void __user
*)arg
;
886 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
887 disk
->disk_name
, cmd
));
890 * If we are in the middle of error recovery, don't let anyone
891 * else try and use this device. Also, if error recovery fails, it
892 * may try and take the device offline, in which case all further
893 * access to the device is prohibited.
895 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
896 (mode
& FMODE_NDELAY
) != 0);
897 if (!scsi_block_when_processing_errors(sdp
) || !error
)
901 * Send SCSI addressing ioctls directly to mid level, send other
902 * ioctls to block level and then onto mid level if they can't be
906 case SCSI_IOCTL_GET_IDLUN
:
907 case SCSI_IOCTL_GET_BUS_NUMBER
:
908 return scsi_ioctl(sdp
, cmd
, p
);
910 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
911 if (error
!= -ENOTTY
)
914 return scsi_ioctl(sdp
, cmd
, p
);
917 static void set_media_not_present(struct scsi_disk
*sdkp
)
919 sdkp
->media_present
= 0;
921 sdkp
->device
->changed
= 1;
925 * sd_media_changed - check if our medium changed
926 * @disk: kernel device descriptor
928 * Returns 0 if not applicable or no change; 1 if change
930 * Note: this function is invoked from the block subsystem.
932 static int sd_media_changed(struct gendisk
*disk
)
934 struct scsi_disk
*sdkp
= scsi_disk(disk
);
935 struct scsi_device
*sdp
= sdkp
->device
;
936 struct scsi_sense_hdr
*sshdr
= NULL
;
939 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
945 * If the device is offline, don't send any commands - just pretend as
946 * if the command failed. If the device ever comes back online, we
947 * can deal with it then. It is only because of unrecoverable errors
948 * that we would ever take a device offline in the first place.
950 if (!scsi_device_online(sdp
)) {
951 set_media_not_present(sdkp
);
957 * Using TEST_UNIT_READY enables differentiation between drive with
958 * no cartridge loaded - NOT READY, drive with changed cartridge -
959 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
961 * Drives that auto spin down. eg iomega jaz 1G, will be started
962 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
963 * sd_revalidate() is called.
967 if (scsi_block_when_processing_errors(sdp
)) {
968 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
969 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
974 * Unable to test, unit probably not ready. This usually
975 * means there is no disc in the drive. Mark as changed,
976 * and we will figure it out later once the drive is
979 if (retval
|| (scsi_sense_valid(sshdr
) &&
980 /* 0x3a is medium not present */
981 sshdr
->asc
== 0x3a)) {
982 set_media_not_present(sdkp
);
988 * For removable scsi disk we have to recognise the presence
989 * of a disk in the drive. This is kept in the struct scsi_disk
990 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
992 sdkp
->media_present
= 1;
994 retval
= sdp
->changed
;
997 if (retval
!= sdkp
->previous_state
)
998 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
999 sdkp
->previous_state
= retval
;
1004 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1007 struct scsi_device
*sdp
= sdkp
->device
;
1008 struct scsi_sense_hdr sshdr
;
1010 if (!scsi_device_online(sdp
))
1014 for (retries
= 3; retries
> 0; --retries
) {
1015 unsigned char cmd
[10] = { 0 };
1017 cmd
[0] = SYNCHRONIZE_CACHE
;
1019 * Leave the rest of the command zero to indicate
1022 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1023 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1029 sd_print_result(sdkp
, res
);
1030 if (driver_byte(res
) & DRIVER_SENSE
)
1031 sd_print_sense_hdr(sdkp
, &sshdr
);
1039 static void sd_prepare_flush(struct request_queue
*q
, struct request
*rq
)
1041 rq
->cmd_type
= REQ_TYPE_BLOCK_PC
;
1042 rq
->timeout
= SD_TIMEOUT
;
1043 rq
->retries
= SD_MAX_RETRIES
;
1044 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
1048 static void sd_rescan(struct device
*dev
)
1050 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1053 revalidate_disk(sdkp
->disk
);
1054 scsi_disk_put(sdkp
);
1059 #ifdef CONFIG_COMPAT
1061 * This gets directly called from VFS. When the ioctl
1062 * is not recognized we go back to the other translation paths.
1064 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1065 unsigned int cmd
, unsigned long arg
)
1067 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1070 * If we are in the middle of error recovery, don't let anyone
1071 * else try and use this device. Also, if error recovery fails, it
1072 * may try and take the device offline, in which case all further
1073 * access to the device is prohibited.
1075 if (!scsi_block_when_processing_errors(sdev
))
1078 if (sdev
->host
->hostt
->compat_ioctl
) {
1081 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1087 * Let the static ioctl translation table take care of it.
1089 return -ENOIOCTLCMD
;
1093 static const struct block_device_operations sd_fops
= {
1094 .owner
= THIS_MODULE
,
1096 .release
= sd_release
,
1097 .locked_ioctl
= sd_ioctl
,
1098 .getgeo
= sd_getgeo
,
1099 #ifdef CONFIG_COMPAT
1100 .compat_ioctl
= sd_compat_ioctl
,
1102 .media_changed
= sd_media_changed
,
1103 .revalidate_disk
= sd_revalidate_disk
,
1106 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1108 u64 start_lba
= blk_rq_pos(scmd
->request
);
1109 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1113 if (!blk_fs_request(scmd
->request
))
1116 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1117 SCSI_SENSE_BUFFERSIZE
,
1122 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1125 if (scmd
->device
->sector_size
< 512) {
1126 /* only legitimate sector_size here is 256 */
1130 /* be careful ... don't want any overflows */
1131 u64 factor
= scmd
->device
->sector_size
/ 512;
1132 do_div(start_lba
, factor
);
1133 do_div(end_lba
, factor
);
1136 /* The bad lba was reported incorrectly, we have no idea where
1139 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1142 /* This computation should always be done in terms of
1143 * the resolution of the device's medium.
1145 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1149 * sd_done - bottom half handler: called when the lower level
1150 * driver has completed (successfully or otherwise) a scsi command.
1151 * @SCpnt: mid-level's per command structure.
1153 * Note: potentially run from within an ISR. Must not block.
1155 static int sd_done(struct scsi_cmnd
*SCpnt
)
1157 int result
= SCpnt
->result
;
1158 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1159 struct scsi_sense_hdr sshdr
;
1160 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1161 int sense_valid
= 0;
1162 int sense_deferred
= 0;
1165 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1167 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1169 #ifdef CONFIG_SCSI_LOGGING
1170 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1172 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1173 "sd_done: sb[respc,sk,asc,"
1174 "ascq]=%x,%x,%x,%x\n",
1175 sshdr
.response_code
,
1176 sshdr
.sense_key
, sshdr
.asc
,
1180 if (driver_byte(result
) != DRIVER_SENSE
&&
1181 (!sense_valid
|| sense_deferred
))
1184 switch (sshdr
.sense_key
) {
1185 case HARDWARE_ERROR
:
1187 good_bytes
= sd_completed_bytes(SCpnt
);
1189 case RECOVERED_ERROR
:
1190 good_bytes
= scsi_bufflen(SCpnt
);
1193 /* This indicates a false check condition, so ignore it. An
1194 * unknown amount of data was transferred so treat it as an
1197 scsi_print_sense("sd", SCpnt
);
1199 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1201 case ABORTED_COMMAND
: /* DIF: Target detected corruption */
1202 case ILLEGAL_REQUEST
: /* DIX: Host detected corruption */
1203 if (sshdr
.asc
== 0x10)
1204 good_bytes
= sd_completed_bytes(SCpnt
);
1210 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1211 sd_dif_complete(SCpnt
, good_bytes
);
1213 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1214 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1216 /* We have to print a failed command here as the
1217 * extended CDB gets freed before scsi_io_completion()
1221 scsi_print_command(SCpnt
);
1223 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1231 static int media_not_present(struct scsi_disk
*sdkp
,
1232 struct scsi_sense_hdr
*sshdr
)
1235 if (!scsi_sense_valid(sshdr
))
1237 /* not invoked for commands that could return deferred errors */
1238 if (sshdr
->sense_key
!= NOT_READY
&&
1239 sshdr
->sense_key
!= UNIT_ATTENTION
)
1241 if (sshdr
->asc
!= 0x3A) /* medium not present */
1244 set_media_not_present(sdkp
);
1249 * spinup disk - called only in sd_revalidate_disk()
1252 sd_spinup_disk(struct scsi_disk
*sdkp
)
1254 unsigned char cmd
[10];
1255 unsigned long spintime_expire
= 0;
1256 int retries
, spintime
;
1257 unsigned int the_result
;
1258 struct scsi_sense_hdr sshdr
;
1259 int sense_valid
= 0;
1263 /* Spin up drives, as required. Only do this at boot time */
1264 /* Spinup needs to be done for module loads too. */
1269 cmd
[0] = TEST_UNIT_READY
;
1270 memset((void *) &cmd
[1], 0, 9);
1272 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1275 SD_MAX_RETRIES
, NULL
);
1278 * If the drive has indicated to us that it
1279 * doesn't have any media in it, don't bother
1280 * with any more polling.
1282 if (media_not_present(sdkp
, &sshdr
))
1286 sense_valid
= scsi_sense_valid(&sshdr
);
1288 } while (retries
< 3 &&
1289 (!scsi_status_is_good(the_result
) ||
1290 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1291 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1293 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1294 /* no sense, TUR either succeeded or failed
1295 * with a status error */
1296 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1297 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1298 sd_print_result(sdkp
, the_result
);
1304 * The device does not want the automatic start to be issued.
1306 if (sdkp
->device
->no_start_on_add
)
1309 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1310 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1311 break; /* manual intervention required */
1312 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1313 break; /* standby */
1314 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1315 break; /* unavailable */
1317 * Issue command to spin up drive when not ready
1320 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1321 cmd
[0] = START_STOP
;
1322 cmd
[1] = 1; /* Return immediately */
1323 memset((void *) &cmd
[2], 0, 8);
1324 cmd
[4] = 1; /* Start spin cycle */
1325 if (sdkp
->device
->start_stop_pwr_cond
)
1327 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1329 SD_TIMEOUT
, SD_MAX_RETRIES
,
1331 spintime_expire
= jiffies
+ 100 * HZ
;
1334 /* Wait 1 second for next try */
1339 * Wait for USB flash devices with slow firmware.
1340 * Yes, this sense key/ASC combination shouldn't
1341 * occur here. It's characteristic of these devices.
1343 } else if (sense_valid
&&
1344 sshdr
.sense_key
== UNIT_ATTENTION
&&
1345 sshdr
.asc
== 0x28) {
1347 spintime_expire
= jiffies
+ 5 * HZ
;
1350 /* Wait 1 second for next try */
1353 /* we don't understand the sense code, so it's
1354 * probably pointless to loop */
1356 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1357 sd_print_sense_hdr(sdkp
, &sshdr
);
1362 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1365 if (scsi_status_is_good(the_result
))
1368 printk("not responding...\n");
1374 * Determine whether disk supports Data Integrity Field.
1376 void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1378 struct scsi_device
*sdp
= sdkp
->device
;
1381 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1384 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1386 if (type
== sdkp
->protection_type
|| !sdkp
->first_scan
)
1389 sdkp
->protection_type
= type
;
1391 if (type
> SD_DIF_TYPE3_PROTECTION
) {
1392 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported " \
1393 "protection type %u. Disabling disk!\n", type
);
1398 if (scsi_host_dif_capable(sdp
->host
, type
))
1399 sd_printk(KERN_NOTICE
, sdkp
,
1400 "Enabling DIF Type %u protection\n", type
);
1402 sd_printk(KERN_NOTICE
, sdkp
,
1403 "Disabling DIF Type %u protection\n", type
);
1406 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1407 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1410 sd_print_result(sdkp
, the_result
);
1411 if (driver_byte(the_result
) & DRIVER_SENSE
)
1412 sd_print_sense_hdr(sdkp
, sshdr
);
1414 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1417 * Set dirty bit for removable devices if not ready -
1418 * sometimes drives will not report this properly.
1420 if (sdp
->removable
&&
1421 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1425 * We used to set media_present to 0 here to indicate no media
1426 * in the drive, but some drives fail read capacity even with
1427 * media present, so we can't do that.
1429 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1433 #if RC16_LEN > SD_BUF_SIZE
1434 #error RC16_LEN must not be more than SD_BUF_SIZE
1437 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1438 unsigned char *buffer
)
1440 unsigned char cmd
[16];
1441 struct scsi_sense_hdr sshdr
;
1442 int sense_valid
= 0;
1445 unsigned int alignment
;
1446 unsigned long long lba
;
1447 unsigned sector_size
;
1451 cmd
[0] = SERVICE_ACTION_IN
;
1452 cmd
[1] = SAI_READ_CAPACITY_16
;
1454 memset(buffer
, 0, RC16_LEN
);
1456 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1457 buffer
, RC16_LEN
, &sshdr
,
1458 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1460 if (media_not_present(sdkp
, &sshdr
))
1464 sense_valid
= scsi_sense_valid(&sshdr
);
1466 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1467 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1469 /* Invalid Command Operation Code or
1470 * Invalid Field in CDB, just retry
1471 * silently with RC10 */
1476 } while (the_result
&& retries
);
1479 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1480 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1484 sector_size
= get_unaligned_be32(&buffer
[8]);
1485 lba
= get_unaligned_be64(&buffer
[0]);
1487 sd_read_protection_type(sdkp
, buffer
);
1489 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1490 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1491 "kernel compiled with support for large block "
1497 /* Logical blocks per physical block exponent */
1498 sdkp
->hw_sector_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1500 /* Lowest aligned logical block */
1501 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1502 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1503 if (alignment
&& sdkp
->first_scan
)
1504 sd_printk(KERN_NOTICE
, sdkp
,
1505 "physical block alignment offset: %u\n", alignment
);
1507 if (buffer
[14] & 0x80) { /* TPE */
1508 struct request_queue
*q
= sdp
->request_queue
;
1510 sdkp
->thin_provisioning
= 1;
1511 q
->limits
.discard_granularity
= sdkp
->hw_sector_size
;
1512 q
->limits
.max_discard_sectors
= 0xffffffff;
1514 if (buffer
[14] & 0x40) /* TPRZ */
1515 q
->limits
.discard_zeroes_data
= 1;
1517 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
1520 sdkp
->capacity
= lba
+ 1;
1524 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1525 unsigned char *buffer
)
1527 unsigned char cmd
[16];
1528 struct scsi_sense_hdr sshdr
;
1529 int sense_valid
= 0;
1533 unsigned sector_size
;
1536 cmd
[0] = READ_CAPACITY
;
1537 memset(&cmd
[1], 0, 9);
1538 memset(buffer
, 0, 8);
1540 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1542 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1544 if (media_not_present(sdkp
, &sshdr
))
1548 sense_valid
= scsi_sense_valid(&sshdr
);
1551 } while (the_result
&& retries
);
1554 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1555 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1559 sector_size
= get_unaligned_be32(&buffer
[4]);
1560 lba
= get_unaligned_be32(&buffer
[0]);
1562 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1563 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1564 "kernel compiled with support for large block "
1570 sdkp
->capacity
= lba
+ 1;
1571 sdkp
->hw_sector_size
= sector_size
;
1575 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1577 if (sdp
->scsi_level
> SCSI_SPC_2
)
1579 if (scsi_device_protection(sdp
))
1585 * read disk capacity
1588 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1591 struct scsi_device
*sdp
= sdkp
->device
;
1592 sector_t old_capacity
= sdkp
->capacity
;
1594 if (sd_try_rc16_first(sdp
)) {
1595 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1596 if (sector_size
== -EOVERFLOW
)
1598 if (sector_size
== -ENODEV
)
1600 if (sector_size
< 0)
1601 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1602 if (sector_size
< 0)
1605 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1606 if (sector_size
== -EOVERFLOW
)
1608 if (sector_size
< 0)
1610 if ((sizeof(sdkp
->capacity
) > 4) &&
1611 (sdkp
->capacity
> 0xffffffffULL
)) {
1612 int old_sector_size
= sector_size
;
1613 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1614 "Trying to use READ CAPACITY(16).\n");
1615 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1616 if (sector_size
< 0) {
1617 sd_printk(KERN_NOTICE
, sdkp
,
1618 "Using 0xffffffff as device size\n");
1619 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1620 sector_size
= old_sector_size
;
1626 /* Some devices are known to return the total number of blocks,
1627 * not the highest block number. Some devices have versions
1628 * which do this and others which do not. Some devices we might
1629 * suspect of doing this but we don't know for certain.
1631 * If we know the reported capacity is wrong, decrement it. If
1632 * we can only guess, then assume the number of blocks is even
1633 * (usually true but not always) and err on the side of lowering
1636 if (sdp
->fix_capacity
||
1637 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1638 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1639 "from its reported value: %llu\n",
1640 (unsigned long long) sdkp
->capacity
);
1645 if (sector_size
== 0) {
1647 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1651 if (sector_size
!= 512 &&
1652 sector_size
!= 1024 &&
1653 sector_size
!= 2048 &&
1654 sector_size
!= 4096 &&
1655 sector_size
!= 256) {
1656 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1659 * The user might want to re-format the drive with
1660 * a supported sectorsize. Once this happens, it
1661 * would be relatively trivial to set the thing up.
1662 * For this reason, we leave the thing in the table.
1666 * set a bogus sector size so the normal read/write
1667 * logic in the block layer will eventually refuse any
1668 * request on this device without tripping over power
1669 * of two sector size assumptions
1673 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
1676 char cap_str_2
[10], cap_str_10
[10];
1677 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1679 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1681 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1682 sizeof(cap_str_10
));
1684 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
1685 sd_printk(KERN_NOTICE
, sdkp
,
1686 "%llu %d-byte logical blocks: (%s/%s)\n",
1687 (unsigned long long)sdkp
->capacity
,
1688 sector_size
, cap_str_10
, cap_str_2
);
1690 if (sdkp
->hw_sector_size
!= sector_size
)
1691 sd_printk(KERN_NOTICE
, sdkp
,
1692 "%u-byte physical blocks\n",
1693 sdkp
->hw_sector_size
);
1697 /* Rescale capacity to 512-byte units */
1698 if (sector_size
== 4096)
1699 sdkp
->capacity
<<= 3;
1700 else if (sector_size
== 2048)
1701 sdkp
->capacity
<<= 2;
1702 else if (sector_size
== 1024)
1703 sdkp
->capacity
<<= 1;
1704 else if (sector_size
== 256)
1705 sdkp
->capacity
>>= 1;
1707 blk_queue_physical_block_size(sdp
->request_queue
, sdkp
->hw_sector_size
);
1708 sdkp
->device
->sector_size
= sector_size
;
1711 /* called with buffer of length 512 */
1713 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1714 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1715 struct scsi_sense_hdr
*sshdr
)
1717 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1718 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1723 * read write protect setting, if possible - called only in sd_revalidate_disk()
1724 * called with buffer of length SD_BUF_SIZE
1727 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1730 struct scsi_device
*sdp
= sdkp
->device
;
1731 struct scsi_mode_data data
;
1732 int old_wp
= sdkp
->write_prot
;
1734 set_disk_ro(sdkp
->disk
, 0);
1735 if (sdp
->skip_ms_page_3f
) {
1736 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1740 if (sdp
->use_192_bytes_for_3f
) {
1741 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1744 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1745 * We have to start carefully: some devices hang if we ask
1746 * for more than is available.
1748 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1751 * Second attempt: ask for page 0 When only page 0 is
1752 * implemented, a request for page 3F may return Sense Key
1753 * 5: Illegal Request, Sense Code 24: Invalid field in
1756 if (!scsi_status_is_good(res
))
1757 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1760 * Third attempt: ask 255 bytes, as we did earlier.
1762 if (!scsi_status_is_good(res
))
1763 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1767 if (!scsi_status_is_good(res
)) {
1768 sd_printk(KERN_WARNING
, sdkp
,
1769 "Test WP failed, assume Write Enabled\n");
1771 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1772 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1773 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
1774 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1775 sdkp
->write_prot
? "on" : "off");
1776 sd_printk(KERN_DEBUG
, sdkp
,
1777 "Mode Sense: %02x %02x %02x %02x\n",
1778 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1784 * sd_read_cache_type - called only from sd_revalidate_disk()
1785 * called with buffer of length SD_BUF_SIZE
1788 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1791 struct scsi_device
*sdp
= sdkp
->device
;
1795 struct scsi_mode_data data
;
1796 struct scsi_sense_hdr sshdr
;
1797 int old_wce
= sdkp
->WCE
;
1798 int old_rcd
= sdkp
->RCD
;
1799 int old_dpofua
= sdkp
->DPOFUA
;
1801 if (sdp
->skip_ms_page_8
)
1804 if (sdp
->type
== TYPE_RBC
) {
1812 /* cautiously ask */
1813 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1815 if (!scsi_status_is_good(res
))
1818 if (!data
.header_length
) {
1820 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1823 /* that went OK, now ask for the proper length */
1827 * We're only interested in the first three bytes, actually.
1828 * But the data cache page is defined for the first 20.
1835 /* Take headers and block descriptors into account */
1836 len
+= data
.header_length
+ data
.block_descriptor_length
;
1837 if (len
> SD_BUF_SIZE
)
1841 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1843 if (scsi_status_is_good(res
)) {
1844 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1846 if (offset
>= SD_BUF_SIZE
- 2) {
1847 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1851 if ((buffer
[offset
] & 0x3f) != modepage
) {
1852 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1856 if (modepage
== 8) {
1857 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1858 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1860 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1864 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1865 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1866 sd_printk(KERN_NOTICE
, sdkp
,
1867 "Uses READ/WRITE(6), disabling FUA\n");
1871 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
1872 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
1873 sd_printk(KERN_NOTICE
, sdkp
,
1874 "Write cache: %s, read cache: %s, %s\n",
1875 sdkp
->WCE
? "enabled" : "disabled",
1876 sdkp
->RCD
? "disabled" : "enabled",
1877 sdkp
->DPOFUA
? "supports DPO and FUA"
1878 : "doesn't support DPO or FUA");
1884 if (scsi_sense_valid(&sshdr
) &&
1885 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1886 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1887 /* Invalid field in CDB */
1888 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1890 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1893 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1900 * The ATO bit indicates whether the DIF application tag is available
1901 * for use by the operating system.
1903 void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1906 struct scsi_device
*sdp
= sdkp
->device
;
1907 struct scsi_mode_data data
;
1908 struct scsi_sense_hdr sshdr
;
1910 if (sdp
->type
!= TYPE_DISK
)
1913 if (sdkp
->protection_type
== 0)
1916 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
1917 SD_MAX_RETRIES
, &data
, &sshdr
);
1919 if (!scsi_status_is_good(res
) || !data
.header_length
||
1921 sd_printk(KERN_WARNING
, sdkp
,
1922 "getting Control mode page failed, assume no ATO\n");
1924 if (scsi_sense_valid(&sshdr
))
1925 sd_print_sense_hdr(sdkp
, &sshdr
);
1930 offset
= data
.header_length
+ data
.block_descriptor_length
;
1932 if ((buffer
[offset
] & 0x3f) != 0x0a) {
1933 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
1937 if ((buffer
[offset
+ 5] & 0x80) == 0)
1946 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1947 * @disk: disk to query
1949 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
1951 struct request_queue
*q
= sdkp
->disk
->queue
;
1952 unsigned int sector_sz
= sdkp
->device
->sector_size
;
1953 const int vpd_len
= 64;
1954 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
1957 /* Block Limits VPD */
1958 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
1961 blk_queue_io_min(sdkp
->disk
->queue
,
1962 get_unaligned_be16(&buffer
[6]) * sector_sz
);
1963 blk_queue_io_opt(sdkp
->disk
->queue
,
1964 get_unaligned_be32(&buffer
[12]) * sector_sz
);
1966 /* Thin provisioning enabled and page length indicates TP support */
1967 if (sdkp
->thin_provisioning
&& buffer
[3] == 0x3c) {
1968 unsigned int lba_count
, desc_count
, granularity
;
1970 lba_count
= get_unaligned_be32(&buffer
[20]);
1971 desc_count
= get_unaligned_be32(&buffer
[24]);
1974 q
->limits
.max_discard_sectors
=
1975 lba_count
* sector_sz
>> 9;
1981 granularity
= get_unaligned_be32(&buffer
[28]);
1984 q
->limits
.discard_granularity
= granularity
* sector_sz
;
1986 if (buffer
[32] & 0x80)
1987 q
->limits
.discard_alignment
=
1988 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
1996 * sd_read_block_characteristics - Query block dev. characteristics
1997 * @disk: disk to query
1999 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2001 unsigned char *buffer
;
2003 const int vpd_len
= 64;
2005 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2008 /* Block Device Characteristics VPD */
2009 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2012 rot
= get_unaligned_be16(&buffer
[4]);
2015 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2021 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2024 * Although VPD inquiries can go to SCSI-2 type devices,
2025 * some USB ones crash on receiving them, and the pages
2026 * we currently ask for are for SPC-3 and beyond
2028 if (sdp
->scsi_level
> SCSI_SPC_2
)
2034 * sd_revalidate_disk - called the first time a new disk is seen,
2035 * performs disk spin up, read_capacity, etc.
2036 * @disk: struct gendisk we care about
2038 static int sd_revalidate_disk(struct gendisk
*disk
)
2040 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2041 struct scsi_device
*sdp
= sdkp
->device
;
2042 unsigned char *buffer
;
2045 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2046 "sd_revalidate_disk\n"));
2049 * If the device is offline, don't try and read capacity or any
2050 * of the other niceties.
2052 if (!scsi_device_online(sdp
))
2055 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2057 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2058 "allocation failure.\n");
2062 sd_spinup_disk(sdkp
);
2065 * Without media there is no reason to ask; moreover, some devices
2066 * react badly if we do.
2068 if (sdkp
->media_present
) {
2069 sd_read_capacity(sdkp
, buffer
);
2071 if (sd_try_extended_inquiry(sdp
)) {
2072 sd_read_block_limits(sdkp
);
2073 sd_read_block_characteristics(sdkp
);
2076 sd_read_write_protect_flag(sdkp
, buffer
);
2077 sd_read_cache_type(sdkp
, buffer
);
2078 sd_read_app_tag_own(sdkp
, buffer
);
2081 sdkp
->first_scan
= 0;
2084 * We now have all cache related info, determine how we deal
2085 * with ordered requests. Note that as the current SCSI
2086 * dispatch function can alter request order, we cannot use
2087 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2090 ordered
= sdkp
->DPOFUA
2091 ? QUEUE_ORDERED_DRAIN_FUA
: QUEUE_ORDERED_DRAIN_FLUSH
;
2093 ordered
= QUEUE_ORDERED_DRAIN
;
2095 blk_queue_ordered(sdkp
->disk
->queue
, ordered
, sd_prepare_flush
);
2097 set_capacity(disk
, sdkp
->capacity
);
2105 * sd_format_disk_name - format disk name
2106 * @prefix: name prefix - ie. "sd" for SCSI disks
2107 * @index: index of the disk to format name for
2108 * @buf: output buffer
2109 * @buflen: length of the output buffer
2111 * SCSI disk names starts at sda. The 26th device is sdz and the
2112 * 27th is sdaa. The last one for two lettered suffix is sdzz
2113 * which is followed by sdaaa.
2115 * This is basically 26 base counting with one extra 'nil' entry
2116 * at the beginning from the second digit on and can be
2117 * determined using similar method as 26 base conversion with the
2118 * index shifted -1 after each digit is computed.
2124 * 0 on success, -errno on failure.
2126 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2128 const int base
= 'z' - 'a' + 1;
2129 char *begin
= buf
+ strlen(prefix
);
2130 char *end
= buf
+ buflen
;
2140 *--p
= 'a' + (index
% unit
);
2141 index
= (index
/ unit
) - 1;
2142 } while (index
>= 0);
2144 memmove(begin
, p
, end
- p
);
2145 memcpy(buf
, prefix
, strlen(prefix
));
2151 * The asynchronous part of sd_probe
2153 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2155 struct scsi_disk
*sdkp
= data
;
2156 struct scsi_device
*sdp
;
2163 index
= sdkp
->index
;
2164 dev
= &sdp
->sdev_gendev
;
2166 if (index
< SD_MAX_DISKS
) {
2167 gd
->major
= sd_major((index
& 0xf0) >> 4);
2168 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2169 gd
->minors
= SD_MINORS
;
2171 gd
->fops
= &sd_fops
;
2172 gd
->private_data
= &sdkp
->driver
;
2173 gd
->queue
= sdkp
->device
->request_queue
;
2175 /* defaults, until the device tells us otherwise */
2176 sdp
->sector_size
= 512;
2178 sdkp
->media_present
= 1;
2179 sdkp
->write_prot
= 0;
2183 sdkp
->first_scan
= 1;
2185 sd_revalidate_disk(gd
);
2187 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2189 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2190 gd
->flags
= GENHD_FL_EXT_DEVT
;
2192 gd
->flags
|= GENHD_FL_REMOVABLE
;
2194 dev_set_drvdata(dev
, sdkp
);
2196 sd_dif_config_host(sdkp
);
2198 sd_revalidate_disk(gd
);
2200 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2201 sdp
->removable
? "removable " : "");
2202 put_device(&sdkp
->dev
);
2206 * sd_probe - called during driver initialization and whenever a
2207 * new scsi device is attached to the system. It is called once
2208 * for each scsi device (not just disks) present.
2209 * @dev: pointer to device object
2211 * Returns 0 if successful (or not interested in this scsi device
2212 * (e.g. scanner)); 1 when there is an error.
2214 * Note: this function is invoked from the scsi mid-level.
2215 * This function sets up the mapping between a given
2216 * <host,channel,id,lun> (found in sdp) and new device name
2217 * (e.g. /dev/sda). More precisely it is the block device major
2218 * and minor number that is chosen here.
2220 * Assume sd_attach is not re-entrant (for time being)
2221 * Also think about sd_attach() and sd_remove() running coincidentally.
2223 static int sd_probe(struct device
*dev
)
2225 struct scsi_device
*sdp
= to_scsi_device(dev
);
2226 struct scsi_disk
*sdkp
;
2232 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2235 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2239 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2243 gd
= alloc_disk(SD_MINORS
);
2248 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2251 spin_lock(&sd_index_lock
);
2252 error
= ida_get_new(&sd_index_ida
, &index
);
2253 spin_unlock(&sd_index_lock
);
2254 } while (error
== -EAGAIN
);
2259 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2261 goto out_free_index
;
2264 sdkp
->driver
= &sd_template
;
2266 sdkp
->index
= index
;
2268 sdkp
->previous_state
= 1;
2270 if (!sdp
->request_queue
->rq_timeout
) {
2271 if (sdp
->type
!= TYPE_MOD
)
2272 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2274 blk_queue_rq_timeout(sdp
->request_queue
,
2278 device_initialize(&sdkp
->dev
);
2279 sdkp
->dev
.parent
= &sdp
->sdev_gendev
;
2280 sdkp
->dev
.class = &sd_disk_class
;
2281 dev_set_name(&sdkp
->dev
, dev_name(&sdp
->sdev_gendev
));
2283 if (device_add(&sdkp
->dev
))
2284 goto out_free_index
;
2286 get_device(&sdp
->sdev_gendev
);
2288 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2289 async_schedule(sd_probe_async
, sdkp
);
2294 spin_lock(&sd_index_lock
);
2295 ida_remove(&sd_index_ida
, index
);
2296 spin_unlock(&sd_index_lock
);
2306 * sd_remove - called whenever a scsi disk (previously recognized by
2307 * sd_probe) is detached from the system. It is called (potentially
2308 * multiple times) during sd module unload.
2309 * @sdp: pointer to mid level scsi device object
2311 * Note: this function is invoked from the scsi mid-level.
2312 * This function potentially frees up a device name (e.g. /dev/sdc)
2313 * that could be re-used by a subsequent sd_probe().
2314 * This function is not called when the built-in sd driver is "exit-ed".
2316 static int sd_remove(struct device
*dev
)
2318 struct scsi_disk
*sdkp
;
2320 async_synchronize_full();
2321 sdkp
= dev_get_drvdata(dev
);
2322 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2323 device_del(&sdkp
->dev
);
2324 del_gendisk(sdkp
->disk
);
2327 mutex_lock(&sd_ref_mutex
);
2328 dev_set_drvdata(dev
, NULL
);
2329 put_device(&sdkp
->dev
);
2330 mutex_unlock(&sd_ref_mutex
);
2336 * scsi_disk_release - Called to free the scsi_disk structure
2337 * @dev: pointer to embedded class device
2339 * sd_ref_mutex must be held entering this routine. Because it is
2340 * called on last put, you should always use the scsi_disk_get()
2341 * scsi_disk_put() helpers which manipulate the semaphore directly
2342 * and never do a direct put_device.
2344 static void scsi_disk_release(struct device
*dev
)
2346 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2347 struct gendisk
*disk
= sdkp
->disk
;
2349 spin_lock(&sd_index_lock
);
2350 ida_remove(&sd_index_ida
, sdkp
->index
);
2351 spin_unlock(&sd_index_lock
);
2353 disk
->private_data
= NULL
;
2355 put_device(&sdkp
->device
->sdev_gendev
);
2360 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2362 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2363 struct scsi_sense_hdr sshdr
;
2364 struct scsi_device
*sdp
= sdkp
->device
;
2368 cmd
[4] |= 1; /* START */
2370 if (sdp
->start_stop_pwr_cond
)
2371 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2373 if (!scsi_device_online(sdp
))
2376 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2377 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2379 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2380 sd_print_result(sdkp
, res
);
2381 if (driver_byte(res
) & DRIVER_SENSE
)
2382 sd_print_sense_hdr(sdkp
, &sshdr
);
2389 * Send a SYNCHRONIZE CACHE instruction down to the device through
2390 * the normal SCSI command structure. Wait for the command to
2393 static void sd_shutdown(struct device
*dev
)
2395 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2398 return; /* this can happen */
2401 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2402 sd_sync_cache(sdkp
);
2405 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2406 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2407 sd_start_stop_device(sdkp
, 0);
2410 scsi_disk_put(sdkp
);
2413 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2415 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2419 return 0; /* this can happen */
2422 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2423 ret
= sd_sync_cache(sdkp
);
2428 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2429 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2430 ret
= sd_start_stop_device(sdkp
, 0);
2434 scsi_disk_put(sdkp
);
2438 static int sd_resume(struct device
*dev
)
2440 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2443 if (!sdkp
->device
->manage_start_stop
)
2446 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2447 ret
= sd_start_stop_device(sdkp
, 1);
2450 scsi_disk_put(sdkp
);
2455 * init_sd - entry point for this driver (both when built in or when
2458 * Note: this function registers this driver with the scsi mid-level.
2460 static int __init
init_sd(void)
2462 int majors
= 0, i
, err
;
2464 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2466 for (i
= 0; i
< SD_MAJORS
; i
++)
2467 if (register_blkdev(sd_major(i
), "sd") == 0)
2473 err
= class_register(&sd_disk_class
);
2477 err
= scsi_register_driver(&sd_template
.gendrv
);
2481 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2483 if (!sd_cdb_cache
) {
2484 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2488 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2490 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2497 kmem_cache_destroy(sd_cdb_cache
);
2500 class_unregister(&sd_disk_class
);
2502 for (i
= 0; i
< SD_MAJORS
; i
++)
2503 unregister_blkdev(sd_major(i
), "sd");
2508 * exit_sd - exit point for this driver (when it is a module).
2510 * Note: this function unregisters this driver from the scsi mid-level.
2512 static void __exit
exit_sd(void)
2516 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2518 mempool_destroy(sd_cdb_pool
);
2519 kmem_cache_destroy(sd_cdb_cache
);
2521 scsi_unregister_driver(&sd_template
.gendrv
);
2522 class_unregister(&sd_disk_class
);
2524 for (i
= 0; i
< SD_MAJORS
; i
++)
2525 unregister_blkdev(sd_major(i
), "sd");
2528 module_init(init_sd
);
2529 module_exit(exit_sd
);
2531 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2532 struct scsi_sense_hdr
*sshdr
)
2534 sd_printk(KERN_INFO
, sdkp
, "");
2535 scsi_show_sense_hdr(sshdr
);
2536 sd_printk(KERN_INFO
, sdkp
, "");
2537 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2540 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2542 sd_printk(KERN_INFO
, sdkp
, "");
2543 scsi_show_result(result
);