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/smp_lock.h>
50 #include <linux/mutex.h>
51 #include <linux/string_helpers.h>
52 #include <linux/async.h>
53 #include <linux/slab.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
68 #include "scsi_logging.h"
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR
);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR
);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR
);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR
);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR
);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR
);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR
);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR
);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR
);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR
);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR
);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR
);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR
);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR
);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR
);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR
);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK
);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD
);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC
);
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
100 static int sd_revalidate_disk(struct gendisk
*);
101 static void sd_unlock_native_capacity(struct gendisk
*disk
);
102 static int sd_probe(struct device
*);
103 static int sd_remove(struct device
*);
104 static void sd_shutdown(struct device
*);
105 static int sd_suspend(struct device
*, pm_message_t state
);
106 static int sd_resume(struct device
*);
107 static void sd_rescan(struct device
*);
108 static int sd_done(struct scsi_cmnd
*);
109 static void sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
);
110 static void scsi_disk_release(struct device
*cdev
);
111 static void sd_print_sense_hdr(struct scsi_disk
*, struct scsi_sense_hdr
*);
112 static void sd_print_result(struct scsi_disk
*, int);
114 static DEFINE_SPINLOCK(sd_index_lock
);
115 static DEFINE_IDA(sd_index_ida
);
117 /* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
120 static DEFINE_MUTEX(sd_ref_mutex
);
122 static struct kmem_cache
*sd_cdb_cache
;
123 static mempool_t
*sd_cdb_pool
;
125 static const char *sd_cache_types
[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
131 sd_store_cache_type(struct device
*dev
, struct device_attribute
*attr
,
132 const char *buf
, size_t count
)
134 int i
, ct
= -1, rcd
, wce
, sp
;
135 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
136 struct scsi_device
*sdp
= sdkp
->device
;
139 struct scsi_mode_data data
;
140 struct scsi_sense_hdr sshdr
;
143 if (sdp
->type
!= TYPE_DISK
)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
149 for (i
= 0; i
< ARRAY_SIZE(sd_cache_types
); i
++) {
150 len
= strlen(sd_cache_types
[i
]);
151 if (strncmp(sd_cache_types
[i
], buf
, len
) == 0 &&
159 rcd
= ct
& 0x01 ? 1 : 0;
160 wce
= ct
& 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp
, 0x08, 8, buffer
, sizeof(buffer
), SD_TIMEOUT
,
162 SD_MAX_RETRIES
, &data
, NULL
))
164 len
= min_t(size_t, sizeof(buffer
), data
.length
- data
.header_length
-
165 data
.block_descriptor_length
);
166 buffer_data
= buffer
+ data
.header_length
+
167 data
.block_descriptor_length
;
168 buffer_data
[2] &= ~0x05;
169 buffer_data
[2] |= wce
<< 2 | rcd
;
170 sp
= buffer_data
[0] & 0x80 ? 1 : 0;
172 if (scsi_mode_select(sdp
, 1, sp
, 8, buffer_data
, len
, SD_TIMEOUT
,
173 SD_MAX_RETRIES
, &data
, &sshdr
)) {
174 if (scsi_sense_valid(&sshdr
))
175 sd_print_sense_hdr(sdkp
, &sshdr
);
178 revalidate_disk(sdkp
->disk
);
183 sd_store_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
184 const char *buf
, size_t count
)
186 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
187 struct scsi_device
*sdp
= sdkp
->device
;
189 if (!capable(CAP_SYS_ADMIN
))
192 sdp
->manage_start_stop
= simple_strtoul(buf
, NULL
, 10);
198 sd_store_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
199 const char *buf
, size_t count
)
201 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
202 struct scsi_device
*sdp
= sdkp
->device
;
204 if (!capable(CAP_SYS_ADMIN
))
207 if (sdp
->type
!= TYPE_DISK
)
210 sdp
->allow_restart
= simple_strtoul(buf
, NULL
, 10);
216 sd_show_cache_type(struct device
*dev
, struct device_attribute
*attr
,
219 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
220 int ct
= sdkp
->RCD
+ 2*sdkp
->WCE
;
222 return snprintf(buf
, 40, "%s\n", sd_cache_types
[ct
]);
226 sd_show_fua(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
228 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
230 return snprintf(buf
, 20, "%u\n", sdkp
->DPOFUA
);
234 sd_show_manage_start_stop(struct device
*dev
, struct device_attribute
*attr
,
237 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
238 struct scsi_device
*sdp
= sdkp
->device
;
240 return snprintf(buf
, 20, "%u\n", sdp
->manage_start_stop
);
244 sd_show_allow_restart(struct device
*dev
, struct device_attribute
*attr
,
247 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
249 return snprintf(buf
, 40, "%d\n", sdkp
->device
->allow_restart
);
253 sd_show_protection_type(struct device
*dev
, struct device_attribute
*attr
,
256 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
258 return snprintf(buf
, 20, "%u\n", sdkp
->protection_type
);
262 sd_show_protection_mode(struct device
*dev
, struct device_attribute
*attr
,
265 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
266 struct scsi_device
*sdp
= sdkp
->device
;
267 unsigned int dif
, dix
;
269 dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
270 dix
= scsi_host_dix_capable(sdp
->host
, sdkp
->protection_type
);
272 if (!dix
&& scsi_host_dix_capable(sdp
->host
, SD_DIF_TYPE0_PROTECTION
)) {
278 return snprintf(buf
, 20, "none\n");
280 return snprintf(buf
, 20, "%s%u\n", dix
? "dix" : "dif", dif
);
284 sd_show_app_tag_own(struct device
*dev
, struct device_attribute
*attr
,
287 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
289 return snprintf(buf
, 20, "%u\n", sdkp
->ATO
);
293 sd_show_thin_provisioning(struct device
*dev
, struct device_attribute
*attr
,
296 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
298 return snprintf(buf
, 20, "%u\n", sdkp
->thin_provisioning
);
301 static struct device_attribute sd_disk_attrs
[] = {
302 __ATTR(cache_type
, S_IRUGO
|S_IWUSR
, sd_show_cache_type
,
303 sd_store_cache_type
),
304 __ATTR(FUA
, S_IRUGO
, sd_show_fua
, NULL
),
305 __ATTR(allow_restart
, S_IRUGO
|S_IWUSR
, sd_show_allow_restart
,
306 sd_store_allow_restart
),
307 __ATTR(manage_start_stop
, S_IRUGO
|S_IWUSR
, sd_show_manage_start_stop
,
308 sd_store_manage_start_stop
),
309 __ATTR(protection_type
, S_IRUGO
, sd_show_protection_type
, NULL
),
310 __ATTR(protection_mode
, S_IRUGO
, sd_show_protection_mode
, NULL
),
311 __ATTR(app_tag_own
, S_IRUGO
, sd_show_app_tag_own
, NULL
),
312 __ATTR(thin_provisioning
, S_IRUGO
, sd_show_thin_provisioning
, NULL
),
316 static struct class sd_disk_class
= {
318 .owner
= THIS_MODULE
,
319 .dev_release
= scsi_disk_release
,
320 .dev_attrs
= sd_disk_attrs
,
323 static struct scsi_driver sd_template
= {
324 .owner
= THIS_MODULE
,
329 .suspend
= sd_suspend
,
331 .shutdown
= sd_shutdown
,
338 * Device no to disk mapping:
340 * major disc2 disc p1
341 * |............|.............|....|....| <- dev_t
344 * Inside a major, we have 16k disks, however mapped non-
345 * contiguously. The first 16 disks are for major0, the next
346 * ones with major1, ... Disk 256 is for major0 again, disk 272
348 * As we stay compatible with our numbering scheme, we can reuse
349 * the well-know SCSI majors 8, 65--71, 136--143.
351 static int sd_major(int major_idx
)
355 return SCSI_DISK0_MAJOR
;
357 return SCSI_DISK1_MAJOR
+ major_idx
- 1;
359 return SCSI_DISK8_MAJOR
+ major_idx
- 8;
362 return 0; /* shut up gcc */
366 static struct scsi_disk
*__scsi_disk_get(struct gendisk
*disk
)
368 struct scsi_disk
*sdkp
= NULL
;
370 if (disk
->private_data
) {
371 sdkp
= scsi_disk(disk
);
372 if (scsi_device_get(sdkp
->device
) == 0)
373 get_device(&sdkp
->dev
);
380 static struct scsi_disk
*scsi_disk_get(struct gendisk
*disk
)
382 struct scsi_disk
*sdkp
;
384 mutex_lock(&sd_ref_mutex
);
385 sdkp
= __scsi_disk_get(disk
);
386 mutex_unlock(&sd_ref_mutex
);
390 static struct scsi_disk
*scsi_disk_get_from_dev(struct device
*dev
)
392 struct scsi_disk
*sdkp
;
394 mutex_lock(&sd_ref_mutex
);
395 sdkp
= dev_get_drvdata(dev
);
397 sdkp
= __scsi_disk_get(sdkp
->disk
);
398 mutex_unlock(&sd_ref_mutex
);
402 static void scsi_disk_put(struct scsi_disk
*sdkp
)
404 struct scsi_device
*sdev
= sdkp
->device
;
406 mutex_lock(&sd_ref_mutex
);
407 put_device(&sdkp
->dev
);
408 scsi_device_put(sdev
);
409 mutex_unlock(&sd_ref_mutex
);
412 static void sd_prot_op(struct scsi_cmnd
*scmd
, unsigned int dif
)
414 unsigned int prot_op
= SCSI_PROT_NORMAL
;
415 unsigned int dix
= scsi_prot_sg_count(scmd
);
417 if (scmd
->sc_data_direction
== DMA_FROM_DEVICE
) {
419 prot_op
= SCSI_PROT_READ_PASS
;
420 else if (dif
&& !dix
)
421 prot_op
= SCSI_PROT_READ_STRIP
;
422 else if (!dif
&& dix
)
423 prot_op
= SCSI_PROT_READ_INSERT
;
426 prot_op
= SCSI_PROT_WRITE_PASS
;
427 else if (dif
&& !dix
)
428 prot_op
= SCSI_PROT_WRITE_INSERT
;
429 else if (!dif
&& dix
)
430 prot_op
= SCSI_PROT_WRITE_STRIP
;
433 scsi_set_prot_op(scmd
, prot_op
);
434 scsi_set_prot_type(scmd
, dif
);
438 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
439 * @sdp: scsi device to operate one
440 * @rq: Request to prepare
442 * Will issue either UNMAP or WRITE SAME(16) depending on preference
443 * indicated by target device.
445 static int scsi_setup_discard_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
447 struct scsi_disk
*sdkp
= scsi_disk(rq
->rq_disk
);
448 struct bio
*bio
= rq
->bio
;
449 sector_t sector
= bio
->bi_sector
;
450 unsigned int nr_sectors
= bio_sectors(bio
);
455 if (sdkp
->device
->sector_size
== 4096) {
460 rq
->timeout
= SD_TIMEOUT
;
462 memset(rq
->cmd
, 0, rq
->cmd_len
);
464 page
= alloc_page(GFP_ATOMIC
| __GFP_ZERO
);
466 return BLKPREP_DEFER
;
469 char *buf
= page_address(page
);
475 put_unaligned_be16(6 + 16, &buf
[0]);
476 put_unaligned_be16(16, &buf
[2]);
477 put_unaligned_be64(sector
, &buf
[8]);
478 put_unaligned_be32(nr_sectors
, &buf
[16]);
483 rq
->cmd
[0] = WRITE_SAME_16
;
484 rq
->cmd
[1] = 0x8; /* UNMAP */
485 put_unaligned_be64(sector
, &rq
->cmd
[2]);
486 put_unaligned_be32(nr_sectors
, &rq
->cmd
[10]);
488 len
= sdkp
->device
->sector_size
;
491 blk_add_request_payload(rq
, page
, len
);
492 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
493 rq
->buffer
= page_address(page
);
494 if (ret
!= BLKPREP_OK
) {
501 static int scsi_setup_flush_cmnd(struct scsi_device
*sdp
, struct request
*rq
)
503 rq
->timeout
= SD_FLUSH_TIMEOUT
;
504 rq
->retries
= SD_MAX_RETRIES
;
505 rq
->cmd
[0] = SYNCHRONIZE_CACHE
;
508 return scsi_setup_blk_pc_cmnd(sdp
, rq
);
511 static void sd_unprep_fn(struct request_queue
*q
, struct request
*rq
)
513 if (rq
->cmd_flags
& REQ_DISCARD
) {
514 free_page((unsigned long)rq
->buffer
);
520 * sd_init_command - build a scsi (read or write) command from
521 * information in the request structure.
522 * @SCpnt: pointer to mid-level's per scsi command structure that
523 * contains request and into which the scsi command is written
525 * Returns 1 if successful and 0 if error (or cannot be done now).
527 static int sd_prep_fn(struct request_queue
*q
, struct request
*rq
)
529 struct scsi_cmnd
*SCpnt
;
530 struct scsi_device
*sdp
= q
->queuedata
;
531 struct gendisk
*disk
= rq
->rq_disk
;
532 struct scsi_disk
*sdkp
;
533 sector_t block
= blk_rq_pos(rq
);
535 unsigned int this_count
= blk_rq_sectors(rq
);
537 unsigned char protect
;
540 * Discard request come in as REQ_TYPE_FS but we turn them into
541 * block PC requests to make life easier.
543 if (rq
->cmd_flags
& REQ_DISCARD
) {
544 ret
= scsi_setup_discard_cmnd(sdp
, rq
);
546 } else if (rq
->cmd_flags
& REQ_FLUSH
) {
547 ret
= scsi_setup_flush_cmnd(sdp
, rq
);
549 } else if (rq
->cmd_type
== REQ_TYPE_BLOCK_PC
) {
550 ret
= scsi_setup_blk_pc_cmnd(sdp
, rq
);
552 } else if (rq
->cmd_type
!= REQ_TYPE_FS
) {
556 ret
= scsi_setup_fs_cmnd(sdp
, rq
);
557 if (ret
!= BLKPREP_OK
)
560 sdkp
= scsi_disk(disk
);
562 /* from here on until we're complete, any goto out
563 * is used for a killable error condition */
566 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO
, SCpnt
,
567 "sd_init_command: block=%llu, "
569 (unsigned long long)block
,
572 if (!sdp
|| !scsi_device_online(sdp
) ||
573 block
+ blk_rq_sectors(rq
) > get_capacity(disk
)) {
574 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
575 "Finishing %u sectors\n",
576 blk_rq_sectors(rq
)));
577 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
578 "Retry with 0x%p\n", SCpnt
));
584 * quietly refuse to do anything to a changed disc until
585 * the changed bit has been reset
587 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
592 * Some SD card readers can't handle multi-sector accesses which touch
593 * the last one or two hardware sectors. Split accesses as needed.
595 threshold
= get_capacity(disk
) - SD_LAST_BUGGY_SECTORS
*
596 (sdp
->sector_size
/ 512);
598 if (unlikely(sdp
->last_sector_bug
&& block
+ this_count
> threshold
)) {
599 if (block
< threshold
) {
600 /* Access up to the threshold but not beyond */
601 this_count
= threshold
- block
;
603 /* Access only a single hardware sector */
604 this_count
= sdp
->sector_size
/ 512;
608 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
, "block=%llu\n",
609 (unsigned long long)block
));
612 * If we have a 1K hardware sectorsize, prevent access to single
613 * 512 byte sectors. In theory we could handle this - in fact
614 * the scsi cdrom driver must be able to handle this because
615 * we typically use 1K blocksizes, and cdroms typically have
616 * 2K hardware sectorsizes. Of course, things are simpler
617 * with the cdrom, since it is read-only. For performance
618 * reasons, the filesystems should be able to handle this
619 * and not force the scsi disk driver to use bounce buffers
622 if (sdp
->sector_size
== 1024) {
623 if ((block
& 1) || (blk_rq_sectors(rq
) & 1)) {
624 scmd_printk(KERN_ERR
, SCpnt
,
625 "Bad block number requested\n");
629 this_count
= this_count
>> 1;
632 if (sdp
->sector_size
== 2048) {
633 if ((block
& 3) || (blk_rq_sectors(rq
) & 3)) {
634 scmd_printk(KERN_ERR
, SCpnt
,
635 "Bad block number requested\n");
639 this_count
= this_count
>> 2;
642 if (sdp
->sector_size
== 4096) {
643 if ((block
& 7) || (blk_rq_sectors(rq
) & 7)) {
644 scmd_printk(KERN_ERR
, SCpnt
,
645 "Bad block number requested\n");
649 this_count
= this_count
>> 3;
652 if (rq_data_dir(rq
) == WRITE
) {
653 if (!sdp
->writeable
) {
656 SCpnt
->cmnd
[0] = WRITE_6
;
657 SCpnt
->sc_data_direction
= DMA_TO_DEVICE
;
659 if (blk_integrity_rq(rq
) &&
660 sd_dif_prepare(rq
, block
, sdp
->sector_size
) == -EIO
)
663 } else if (rq_data_dir(rq
) == READ
) {
664 SCpnt
->cmnd
[0] = READ_6
;
665 SCpnt
->sc_data_direction
= DMA_FROM_DEVICE
;
667 scmd_printk(KERN_ERR
, SCpnt
, "Unknown command %x\n", rq
->cmd_flags
);
671 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO
, SCpnt
,
672 "%s %d/%u 512 byte blocks.\n",
673 (rq_data_dir(rq
) == WRITE
) ?
674 "writing" : "reading", this_count
,
675 blk_rq_sectors(rq
)));
677 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
678 host_dif
= scsi_host_dif_capable(sdp
->host
, sdkp
->protection_type
);
684 if (host_dif
== SD_DIF_TYPE2_PROTECTION
) {
685 SCpnt
->cmnd
= mempool_alloc(sd_cdb_pool
, GFP_ATOMIC
);
687 if (unlikely(SCpnt
->cmnd
== NULL
)) {
692 SCpnt
->cmd_len
= SD_EXT_CDB_SIZE
;
693 memset(SCpnt
->cmnd
, 0, SCpnt
->cmd_len
);
694 SCpnt
->cmnd
[0] = VARIABLE_LENGTH_CMD
;
695 SCpnt
->cmnd
[7] = 0x18;
696 SCpnt
->cmnd
[9] = (rq_data_dir(rq
) == READ
) ? READ_32
: WRITE_32
;
697 SCpnt
->cmnd
[10] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
700 SCpnt
->cmnd
[12] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
701 SCpnt
->cmnd
[13] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
702 SCpnt
->cmnd
[14] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
703 SCpnt
->cmnd
[15] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
704 SCpnt
->cmnd
[16] = (unsigned char) (block
>> 24) & 0xff;
705 SCpnt
->cmnd
[17] = (unsigned char) (block
>> 16) & 0xff;
706 SCpnt
->cmnd
[18] = (unsigned char) (block
>> 8) & 0xff;
707 SCpnt
->cmnd
[19] = (unsigned char) block
& 0xff;
709 /* Expected Indirect LBA */
710 SCpnt
->cmnd
[20] = (unsigned char) (block
>> 24) & 0xff;
711 SCpnt
->cmnd
[21] = (unsigned char) (block
>> 16) & 0xff;
712 SCpnt
->cmnd
[22] = (unsigned char) (block
>> 8) & 0xff;
713 SCpnt
->cmnd
[23] = (unsigned char) block
& 0xff;
715 /* Transfer length */
716 SCpnt
->cmnd
[28] = (unsigned char) (this_count
>> 24) & 0xff;
717 SCpnt
->cmnd
[29] = (unsigned char) (this_count
>> 16) & 0xff;
718 SCpnt
->cmnd
[30] = (unsigned char) (this_count
>> 8) & 0xff;
719 SCpnt
->cmnd
[31] = (unsigned char) this_count
& 0xff;
720 } else if (block
> 0xffffffff) {
721 SCpnt
->cmnd
[0] += READ_16
- READ_6
;
722 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
723 SCpnt
->cmnd
[2] = sizeof(block
) > 4 ? (unsigned char) (block
>> 56) & 0xff : 0;
724 SCpnt
->cmnd
[3] = sizeof(block
) > 4 ? (unsigned char) (block
>> 48) & 0xff : 0;
725 SCpnt
->cmnd
[4] = sizeof(block
) > 4 ? (unsigned char) (block
>> 40) & 0xff : 0;
726 SCpnt
->cmnd
[5] = sizeof(block
) > 4 ? (unsigned char) (block
>> 32) & 0xff : 0;
727 SCpnt
->cmnd
[6] = (unsigned char) (block
>> 24) & 0xff;
728 SCpnt
->cmnd
[7] = (unsigned char) (block
>> 16) & 0xff;
729 SCpnt
->cmnd
[8] = (unsigned char) (block
>> 8) & 0xff;
730 SCpnt
->cmnd
[9] = (unsigned char) block
& 0xff;
731 SCpnt
->cmnd
[10] = (unsigned char) (this_count
>> 24) & 0xff;
732 SCpnt
->cmnd
[11] = (unsigned char) (this_count
>> 16) & 0xff;
733 SCpnt
->cmnd
[12] = (unsigned char) (this_count
>> 8) & 0xff;
734 SCpnt
->cmnd
[13] = (unsigned char) this_count
& 0xff;
735 SCpnt
->cmnd
[14] = SCpnt
->cmnd
[15] = 0;
736 } else if ((this_count
> 0xff) || (block
> 0x1fffff) ||
737 scsi_device_protection(SCpnt
->device
) ||
738 SCpnt
->device
->use_10_for_rw
) {
739 if (this_count
> 0xffff)
742 SCpnt
->cmnd
[0] += READ_10
- READ_6
;
743 SCpnt
->cmnd
[1] = protect
| ((rq
->cmd_flags
& REQ_FUA
) ? 0x8 : 0);
744 SCpnt
->cmnd
[2] = (unsigned char) (block
>> 24) & 0xff;
745 SCpnt
->cmnd
[3] = (unsigned char) (block
>> 16) & 0xff;
746 SCpnt
->cmnd
[4] = (unsigned char) (block
>> 8) & 0xff;
747 SCpnt
->cmnd
[5] = (unsigned char) block
& 0xff;
748 SCpnt
->cmnd
[6] = SCpnt
->cmnd
[9] = 0;
749 SCpnt
->cmnd
[7] = (unsigned char) (this_count
>> 8) & 0xff;
750 SCpnt
->cmnd
[8] = (unsigned char) this_count
& 0xff;
752 if (unlikely(rq
->cmd_flags
& REQ_FUA
)) {
754 * This happens only if this drive failed
755 * 10byte rw command with ILLEGAL_REQUEST
756 * during operation and thus turned off
759 scmd_printk(KERN_ERR
, SCpnt
,
760 "FUA write on READ/WRITE(6) drive\n");
764 SCpnt
->cmnd
[1] |= (unsigned char) ((block
>> 16) & 0x1f);
765 SCpnt
->cmnd
[2] = (unsigned char) ((block
>> 8) & 0xff);
766 SCpnt
->cmnd
[3] = (unsigned char) block
& 0xff;
767 SCpnt
->cmnd
[4] = (unsigned char) this_count
;
770 SCpnt
->sdb
.length
= this_count
* sdp
->sector_size
;
772 /* If DIF or DIX is enabled, tell HBA how to handle request */
773 if (host_dif
|| scsi_prot_sg_count(SCpnt
))
774 sd_prot_op(SCpnt
, host_dif
);
777 * We shouldn't disconnect in the middle of a sector, so with a dumb
778 * host adapter, it's safe to assume that we can at least transfer
779 * this many bytes between each connect / disconnect.
781 SCpnt
->transfersize
= sdp
->sector_size
;
782 SCpnt
->underflow
= this_count
<< 9;
783 SCpnt
->allowed
= SD_MAX_RETRIES
;
786 * This indicates that the command is ready from our end to be
791 return scsi_prep_return(q
, rq
, ret
);
795 * sd_open - open a scsi disk device
796 * @inode: only i_rdev member may be used
797 * @filp: only f_mode and f_flags may be used
799 * Returns 0 if successful. Returns a negated errno value in case
802 * Note: This can be called from a user context (e.g. fsck(1) )
803 * or from within the kernel (e.g. as a result of a mount(1) ).
804 * In the latter case @inode and @filp carry an abridged amount
805 * of information as noted above.
807 * Locking: called with bdev->bd_mutex held.
809 static int sd_open(struct block_device
*bdev
, fmode_t mode
)
811 struct scsi_disk
*sdkp
= scsi_disk_get(bdev
->bd_disk
);
812 struct scsi_device
*sdev
;
818 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_open\n"));
822 retval
= scsi_autopm_get_device(sdev
);
827 * If the device is in error recovery, wait until it is done.
828 * If the device is offline, then disallow any access to it.
831 if (!scsi_block_when_processing_errors(sdev
))
834 if (sdev
->removable
|| sdkp
->write_prot
)
835 check_disk_change(bdev
);
838 * If the drive is empty, just let the open fail.
841 if (sdev
->removable
&& !sdkp
->media_present
&& !(mode
& FMODE_NDELAY
))
845 * If the device has the write protect tab set, have the open fail
846 * if the user expects to be able to write to the thing.
849 if (sdkp
->write_prot
&& (mode
& FMODE_WRITE
))
853 * It is possible that the disk changing stuff resulted in
854 * the device being taken offline. If this is the case,
855 * report this to the user, and don't pretend that the
856 * open actually succeeded.
859 if (!scsi_device_online(sdev
))
862 if ((atomic_inc_return(&sdkp
->openers
) == 1) && sdev
->removable
) {
863 if (scsi_block_when_processing_errors(sdev
))
864 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_PREVENT
);
870 scsi_autopm_put_device(sdev
);
877 * sd_release - invoked when the (last) close(2) is called on this
879 * @inode: only i_rdev member may be used
880 * @filp: only f_mode and f_flags may be used
884 * Note: may block (uninterruptible) if error recovery is underway
887 * Locking: called with bdev->bd_mutex held.
889 static int sd_release(struct gendisk
*disk
, fmode_t mode
)
891 struct scsi_disk
*sdkp
= scsi_disk(disk
);
892 struct scsi_device
*sdev
= sdkp
->device
;
894 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_release\n"));
896 if (atomic_dec_return(&sdkp
->openers
) == 0 && sdev
->removable
) {
897 if (scsi_block_when_processing_errors(sdev
))
898 scsi_set_medium_removal(sdev
, SCSI_REMOVAL_ALLOW
);
902 * XXX and what if there are packets in flight and this close()
903 * XXX is followed by a "rmmod sd_mod"?
906 scsi_autopm_put_device(sdev
);
911 static int sd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
913 struct scsi_disk
*sdkp
= scsi_disk(bdev
->bd_disk
);
914 struct scsi_device
*sdp
= sdkp
->device
;
915 struct Scsi_Host
*host
= sdp
->host
;
918 /* default to most commonly used values */
919 diskinfo
[0] = 0x40; /* 1 << 6 */
920 diskinfo
[1] = 0x20; /* 1 << 5 */
921 diskinfo
[2] = sdkp
->capacity
>> 11;
923 /* override with calculated, extended default, or driver values */
924 if (host
->hostt
->bios_param
)
925 host
->hostt
->bios_param(sdp
, bdev
, sdkp
->capacity
, diskinfo
);
927 scsicam_bios_param(bdev
, sdkp
->capacity
, diskinfo
);
929 geo
->heads
= diskinfo
[0];
930 geo
->sectors
= diskinfo
[1];
931 geo
->cylinders
= diskinfo
[2];
936 * sd_ioctl - process an ioctl
937 * @inode: only i_rdev/i_bdev members may be used
938 * @filp: only f_mode and f_flags may be used
939 * @cmd: ioctl command number
940 * @arg: this is third argument given to ioctl(2) system call.
941 * Often contains a pointer.
943 * Returns 0 if successful (some ioctls return postive numbers on
944 * success as well). Returns a negated errno value in case of error.
946 * Note: most ioctls are forward onto the block subsystem or further
947 * down in the scsi subsystem.
949 static int sd_ioctl(struct block_device
*bdev
, fmode_t mode
,
950 unsigned int cmd
, unsigned long arg
)
952 struct gendisk
*disk
= bdev
->bd_disk
;
953 struct scsi_device
*sdp
= scsi_disk(disk
)->device
;
954 void __user
*p
= (void __user
*)arg
;
957 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
958 disk
->disk_name
, cmd
));
961 * If we are in the middle of error recovery, don't let anyone
962 * else try and use this device. Also, if error recovery fails, it
963 * may try and take the device offline, in which case all further
964 * access to the device is prohibited.
966 error
= scsi_nonblockable_ioctl(sdp
, cmd
, p
,
967 (mode
& FMODE_NDELAY
) != 0);
968 if (!scsi_block_when_processing_errors(sdp
) || !error
)
972 * Send SCSI addressing ioctls directly to mid level, send other
973 * ioctls to block level and then onto mid level if they can't be
977 case SCSI_IOCTL_GET_IDLUN
:
978 case SCSI_IOCTL_GET_BUS_NUMBER
:
979 error
= scsi_ioctl(sdp
, cmd
, p
);
982 error
= scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, p
);
983 if (error
!= -ENOTTY
)
985 error
= scsi_ioctl(sdp
, cmd
, p
);
992 static void set_media_not_present(struct scsi_disk
*sdkp
)
994 sdkp
->media_present
= 0;
996 sdkp
->device
->changed
= 1;
1000 * sd_media_changed - check if our medium changed
1001 * @disk: kernel device descriptor
1003 * Returns 0 if not applicable or no change; 1 if change
1005 * Note: this function is invoked from the block subsystem.
1007 static int sd_media_changed(struct gendisk
*disk
)
1009 struct scsi_disk
*sdkp
= scsi_disk(disk
);
1010 struct scsi_device
*sdp
= sdkp
->device
;
1011 struct scsi_sense_hdr
*sshdr
= NULL
;
1014 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
, "sd_media_changed\n"));
1016 if (!sdp
->removable
)
1020 * If the device is offline, don't send any commands - just pretend as
1021 * if the command failed. If the device ever comes back online, we
1022 * can deal with it then. It is only because of unrecoverable errors
1023 * that we would ever take a device offline in the first place.
1025 if (!scsi_device_online(sdp
)) {
1026 set_media_not_present(sdkp
);
1032 * Using TEST_UNIT_READY enables differentiation between drive with
1033 * no cartridge loaded - NOT READY, drive with changed cartridge -
1034 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1036 * Drives that auto spin down. eg iomega jaz 1G, will be started
1037 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1038 * sd_revalidate() is called.
1042 if (scsi_block_when_processing_errors(sdp
)) {
1043 sshdr
= kzalloc(sizeof(*sshdr
), GFP_KERNEL
);
1044 retval
= scsi_test_unit_ready(sdp
, SD_TIMEOUT
, SD_MAX_RETRIES
,
1049 set_media_not_present(sdkp
);
1055 * For removable scsi disk we have to recognise the presence
1056 * of a disk in the drive. This is kept in the struct scsi_disk
1057 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1059 sdkp
->media_present
= 1;
1061 retval
= sdp
->changed
;
1064 if (retval
!= sdkp
->previous_state
)
1065 sdev_evt_send_simple(sdp
, SDEV_EVT_MEDIA_CHANGE
, GFP_KERNEL
);
1066 sdkp
->previous_state
= retval
;
1071 static int sd_sync_cache(struct scsi_disk
*sdkp
)
1074 struct scsi_device
*sdp
= sdkp
->device
;
1075 struct scsi_sense_hdr sshdr
;
1077 if (!scsi_device_online(sdp
))
1081 for (retries
= 3; retries
> 0; --retries
) {
1082 unsigned char cmd
[10] = { 0 };
1084 cmd
[0] = SYNCHRONIZE_CACHE
;
1086 * Leave the rest of the command zero to indicate
1089 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
1090 SD_FLUSH_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1096 sd_print_result(sdkp
, res
);
1097 if (driver_byte(res
) & DRIVER_SENSE
)
1098 sd_print_sense_hdr(sdkp
, &sshdr
);
1106 static void sd_rescan(struct device
*dev
)
1108 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
1111 revalidate_disk(sdkp
->disk
);
1112 scsi_disk_put(sdkp
);
1117 #ifdef CONFIG_COMPAT
1119 * This gets directly called from VFS. When the ioctl
1120 * is not recognized we go back to the other translation paths.
1122 static int sd_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
1123 unsigned int cmd
, unsigned long arg
)
1125 struct scsi_device
*sdev
= scsi_disk(bdev
->bd_disk
)->device
;
1128 * If we are in the middle of error recovery, don't let anyone
1129 * else try and use this device. Also, if error recovery fails, it
1130 * may try and take the device offline, in which case all further
1131 * access to the device is prohibited.
1133 if (!scsi_block_when_processing_errors(sdev
))
1136 if (sdev
->host
->hostt
->compat_ioctl
) {
1139 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd
, (void __user
*)arg
);
1145 * Let the static ioctl translation table take care of it.
1147 return -ENOIOCTLCMD
;
1151 static const struct block_device_operations sd_fops
= {
1152 .owner
= THIS_MODULE
,
1154 .release
= sd_release
,
1156 .getgeo
= sd_getgeo
,
1157 #ifdef CONFIG_COMPAT
1158 .compat_ioctl
= sd_compat_ioctl
,
1160 .media_changed
= sd_media_changed
,
1161 .revalidate_disk
= sd_revalidate_disk
,
1162 .unlock_native_capacity
= sd_unlock_native_capacity
,
1165 static unsigned int sd_completed_bytes(struct scsi_cmnd
*scmd
)
1167 u64 start_lba
= blk_rq_pos(scmd
->request
);
1168 u64 end_lba
= blk_rq_pos(scmd
->request
) + (scsi_bufflen(scmd
) / 512);
1172 if (scmd
->request
->cmd_type
!= REQ_TYPE_FS
)
1175 info_valid
= scsi_get_sense_info_fld(scmd
->sense_buffer
,
1176 SCSI_SENSE_BUFFERSIZE
,
1181 if (scsi_bufflen(scmd
) <= scmd
->device
->sector_size
)
1184 if (scmd
->device
->sector_size
< 512) {
1185 /* only legitimate sector_size here is 256 */
1189 /* be careful ... don't want any overflows */
1190 u64 factor
= scmd
->device
->sector_size
/ 512;
1191 do_div(start_lba
, factor
);
1192 do_div(end_lba
, factor
);
1195 /* The bad lba was reported incorrectly, we have no idea where
1198 if (bad_lba
< start_lba
|| bad_lba
>= end_lba
)
1201 /* This computation should always be done in terms of
1202 * the resolution of the device's medium.
1204 return (bad_lba
- start_lba
) * scmd
->device
->sector_size
;
1208 * sd_done - bottom half handler: called when the lower level
1209 * driver has completed (successfully or otherwise) a scsi command.
1210 * @SCpnt: mid-level's per command structure.
1212 * Note: potentially run from within an ISR. Must not block.
1214 static int sd_done(struct scsi_cmnd
*SCpnt
)
1216 int result
= SCpnt
->result
;
1217 unsigned int good_bytes
= result
? 0 : scsi_bufflen(SCpnt
);
1218 struct scsi_sense_hdr sshdr
;
1219 struct scsi_disk
*sdkp
= scsi_disk(SCpnt
->request
->rq_disk
);
1220 int sense_valid
= 0;
1221 int sense_deferred
= 0;
1223 if (SCpnt
->request
->cmd_flags
& REQ_DISCARD
) {
1225 scsi_set_resid(SCpnt
, 0);
1230 sense_valid
= scsi_command_normalize_sense(SCpnt
, &sshdr
);
1232 sense_deferred
= scsi_sense_is_deferred(&sshdr
);
1234 #ifdef CONFIG_SCSI_LOGGING
1235 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt
));
1237 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO
, SCpnt
,
1238 "sd_done: sb[respc,sk,asc,"
1239 "ascq]=%x,%x,%x,%x\n",
1240 sshdr
.response_code
,
1241 sshdr
.sense_key
, sshdr
.asc
,
1245 if (driver_byte(result
) != DRIVER_SENSE
&&
1246 (!sense_valid
|| sense_deferred
))
1249 switch (sshdr
.sense_key
) {
1250 case HARDWARE_ERROR
:
1252 good_bytes
= sd_completed_bytes(SCpnt
);
1254 case RECOVERED_ERROR
:
1255 good_bytes
= scsi_bufflen(SCpnt
);
1258 /* This indicates a false check condition, so ignore it. An
1259 * unknown amount of data was transferred so treat it as an
1262 scsi_print_sense("sd", SCpnt
);
1264 memset(SCpnt
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1266 case ABORTED_COMMAND
: /* DIF: Target detected corruption */
1267 case ILLEGAL_REQUEST
: /* DIX: Host detected corruption */
1268 if (sshdr
.asc
== 0x10)
1269 good_bytes
= sd_completed_bytes(SCpnt
);
1275 if (rq_data_dir(SCpnt
->request
) == READ
&& scsi_prot_sg_count(SCpnt
))
1276 sd_dif_complete(SCpnt
, good_bytes
);
1278 if (scsi_host_dif_capable(sdkp
->device
->host
, sdkp
->protection_type
)
1279 == SD_DIF_TYPE2_PROTECTION
&& SCpnt
->cmnd
!= SCpnt
->request
->cmd
) {
1281 /* We have to print a failed command here as the
1282 * extended CDB gets freed before scsi_io_completion()
1286 scsi_print_command(SCpnt
);
1288 mempool_free(SCpnt
->cmnd
, sd_cdb_pool
);
1296 static int media_not_present(struct scsi_disk
*sdkp
,
1297 struct scsi_sense_hdr
*sshdr
)
1300 if (!scsi_sense_valid(sshdr
))
1302 /* not invoked for commands that could return deferred errors */
1303 if (sshdr
->sense_key
!= NOT_READY
&&
1304 sshdr
->sense_key
!= UNIT_ATTENTION
)
1306 if (sshdr
->asc
!= 0x3A) /* medium not present */
1309 set_media_not_present(sdkp
);
1314 * spinup disk - called only in sd_revalidate_disk()
1317 sd_spinup_disk(struct scsi_disk
*sdkp
)
1319 unsigned char cmd
[10];
1320 unsigned long spintime_expire
= 0;
1321 int retries
, spintime
;
1322 unsigned int the_result
;
1323 struct scsi_sense_hdr sshdr
;
1324 int sense_valid
= 0;
1328 /* Spin up drives, as required. Only do this at boot time */
1329 /* Spinup needs to be done for module loads too. */
1334 cmd
[0] = TEST_UNIT_READY
;
1335 memset((void *) &cmd
[1], 0, 9);
1337 the_result
= scsi_execute_req(sdkp
->device
, cmd
,
1340 SD_MAX_RETRIES
, NULL
);
1343 * If the drive has indicated to us that it
1344 * doesn't have any media in it, don't bother
1345 * with any more polling.
1347 if (media_not_present(sdkp
, &sshdr
))
1351 sense_valid
= scsi_sense_valid(&sshdr
);
1353 } while (retries
< 3 &&
1354 (!scsi_status_is_good(the_result
) ||
1355 ((driver_byte(the_result
) & DRIVER_SENSE
) &&
1356 sense_valid
&& sshdr
.sense_key
== UNIT_ATTENTION
)));
1358 if ((driver_byte(the_result
) & DRIVER_SENSE
) == 0) {
1359 /* no sense, TUR either succeeded or failed
1360 * with a status error */
1361 if(!spintime
&& !scsi_status_is_good(the_result
)) {
1362 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1363 sd_print_result(sdkp
, the_result
);
1369 * The device does not want the automatic start to be issued.
1371 if (sdkp
->device
->no_start_on_add
)
1374 if (sense_valid
&& sshdr
.sense_key
== NOT_READY
) {
1375 if (sshdr
.asc
== 4 && sshdr
.ascq
== 3)
1376 break; /* manual intervention required */
1377 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xb)
1378 break; /* standby */
1379 if (sshdr
.asc
== 4 && sshdr
.ascq
== 0xc)
1380 break; /* unavailable */
1382 * Issue command to spin up drive when not ready
1385 sd_printk(KERN_NOTICE
, sdkp
, "Spinning up disk...");
1386 cmd
[0] = START_STOP
;
1387 cmd
[1] = 1; /* Return immediately */
1388 memset((void *) &cmd
[2], 0, 8);
1389 cmd
[4] = 1; /* Start spin cycle */
1390 if (sdkp
->device
->start_stop_pwr_cond
)
1392 scsi_execute_req(sdkp
->device
, cmd
, DMA_NONE
,
1394 SD_TIMEOUT
, SD_MAX_RETRIES
,
1396 spintime_expire
= jiffies
+ 100 * HZ
;
1399 /* Wait 1 second for next try */
1404 * Wait for USB flash devices with slow firmware.
1405 * Yes, this sense key/ASC combination shouldn't
1406 * occur here. It's characteristic of these devices.
1408 } else if (sense_valid
&&
1409 sshdr
.sense_key
== UNIT_ATTENTION
&&
1410 sshdr
.asc
== 0x28) {
1412 spintime_expire
= jiffies
+ 5 * HZ
;
1415 /* Wait 1 second for next try */
1418 /* we don't understand the sense code, so it's
1419 * probably pointless to loop */
1421 sd_printk(KERN_NOTICE
, sdkp
, "Unit Not Ready\n");
1422 sd_print_sense_hdr(sdkp
, &sshdr
);
1427 } while (spintime
&& time_before_eq(jiffies
, spintime_expire
));
1430 if (scsi_status_is_good(the_result
))
1433 printk("not responding...\n");
1439 * Determine whether disk supports Data Integrity Field.
1441 static void sd_read_protection_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1443 struct scsi_device
*sdp
= sdkp
->device
;
1446 if (scsi_device_protection(sdp
) == 0 || (buffer
[12] & 1) == 0)
1449 type
= ((buffer
[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1451 if (type
== sdkp
->protection_type
|| !sdkp
->first_scan
)
1454 sdkp
->protection_type
= type
;
1456 if (type
> SD_DIF_TYPE3_PROTECTION
) {
1457 sd_printk(KERN_ERR
, sdkp
, "formatted with unsupported " \
1458 "protection type %u. Disabling disk!\n", type
);
1463 if (scsi_host_dif_capable(sdp
->host
, type
))
1464 sd_printk(KERN_NOTICE
, sdkp
,
1465 "Enabling DIF Type %u protection\n", type
);
1467 sd_printk(KERN_NOTICE
, sdkp
,
1468 "Disabling DIF Type %u protection\n", type
);
1471 static void read_capacity_error(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1472 struct scsi_sense_hdr
*sshdr
, int sense_valid
,
1475 sd_print_result(sdkp
, the_result
);
1476 if (driver_byte(the_result
) & DRIVER_SENSE
)
1477 sd_print_sense_hdr(sdkp
, sshdr
);
1479 sd_printk(KERN_NOTICE
, sdkp
, "Sense not available.\n");
1482 * Set dirty bit for removable devices if not ready -
1483 * sometimes drives will not report this properly.
1485 if (sdp
->removable
&&
1486 sense_valid
&& sshdr
->sense_key
== NOT_READY
)
1490 * We used to set media_present to 0 here to indicate no media
1491 * in the drive, but some drives fail read capacity even with
1492 * media present, so we can't do that.
1494 sdkp
->capacity
= 0; /* unknown mapped to zero - as usual */
1498 #if RC16_LEN > SD_BUF_SIZE
1499 #error RC16_LEN must not be more than SD_BUF_SIZE
1502 #define READ_CAPACITY_RETRIES_ON_RESET 10
1504 static int read_capacity_16(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1505 unsigned char *buffer
)
1507 unsigned char cmd
[16];
1508 struct scsi_sense_hdr sshdr
;
1509 int sense_valid
= 0;
1511 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1512 unsigned int alignment
;
1513 unsigned long long lba
;
1514 unsigned sector_size
;
1516 if (sdp
->no_read_capacity_16
)
1521 cmd
[0] = SERVICE_ACTION_IN
;
1522 cmd
[1] = SAI_READ_CAPACITY_16
;
1524 memset(buffer
, 0, RC16_LEN
);
1526 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1527 buffer
, RC16_LEN
, &sshdr
,
1528 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1530 if (media_not_present(sdkp
, &sshdr
))
1534 sense_valid
= scsi_sense_valid(&sshdr
);
1536 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1537 (sshdr
.asc
== 0x20 || sshdr
.asc
== 0x24) &&
1539 /* Invalid Command Operation Code or
1540 * Invalid Field in CDB, just retry
1541 * silently with RC10 */
1544 sshdr
.sense_key
== UNIT_ATTENTION
&&
1545 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1546 /* Device reset might occur several times,
1547 * give it one more chance */
1548 if (--reset_retries
> 0)
1553 } while (the_result
&& retries
);
1556 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY(16) failed\n");
1557 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1561 sector_size
= get_unaligned_be32(&buffer
[8]);
1562 lba
= get_unaligned_be64(&buffer
[0]);
1564 sd_read_protection_type(sdkp
, buffer
);
1566 if ((sizeof(sdkp
->capacity
) == 4) && (lba
>= 0xffffffffULL
)) {
1567 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1568 "kernel compiled with support for large block "
1574 /* Logical blocks per physical block exponent */
1575 sdkp
->physical_block_size
= (1 << (buffer
[13] & 0xf)) * sector_size
;
1577 /* Lowest aligned logical block */
1578 alignment
= ((buffer
[14] & 0x3f) << 8 | buffer
[15]) * sector_size
;
1579 blk_queue_alignment_offset(sdp
->request_queue
, alignment
);
1580 if (alignment
&& sdkp
->first_scan
)
1581 sd_printk(KERN_NOTICE
, sdkp
,
1582 "physical block alignment offset: %u\n", alignment
);
1584 if (buffer
[14] & 0x80) { /* TPE */
1585 struct request_queue
*q
= sdp
->request_queue
;
1587 sdkp
->thin_provisioning
= 1;
1588 q
->limits
.discard_granularity
= sdkp
->physical_block_size
;
1589 q
->limits
.max_discard_sectors
= 0xffffffff;
1591 if (buffer
[14] & 0x40) /* TPRZ */
1592 q
->limits
.discard_zeroes_data
= 1;
1594 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD
, q
);
1597 sdkp
->capacity
= lba
+ 1;
1601 static int read_capacity_10(struct scsi_disk
*sdkp
, struct scsi_device
*sdp
,
1602 unsigned char *buffer
)
1604 unsigned char cmd
[16];
1605 struct scsi_sense_hdr sshdr
;
1606 int sense_valid
= 0;
1608 int retries
= 3, reset_retries
= READ_CAPACITY_RETRIES_ON_RESET
;
1610 unsigned sector_size
;
1613 cmd
[0] = READ_CAPACITY
;
1614 memset(&cmd
[1], 0, 9);
1615 memset(buffer
, 0, 8);
1617 the_result
= scsi_execute_req(sdp
, cmd
, DMA_FROM_DEVICE
,
1619 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
1621 if (media_not_present(sdkp
, &sshdr
))
1625 sense_valid
= scsi_sense_valid(&sshdr
);
1627 sshdr
.sense_key
== UNIT_ATTENTION
&&
1628 sshdr
.asc
== 0x29 && sshdr
.ascq
== 0x00)
1629 /* Device reset might occur several times,
1630 * give it one more chance */
1631 if (--reset_retries
> 0)
1636 } while (the_result
&& retries
);
1639 sd_printk(KERN_NOTICE
, sdkp
, "READ CAPACITY failed\n");
1640 read_capacity_error(sdkp
, sdp
, &sshdr
, sense_valid
, the_result
);
1644 sector_size
= get_unaligned_be32(&buffer
[4]);
1645 lba
= get_unaligned_be32(&buffer
[0]);
1647 if (sdp
->no_read_capacity_16
&& (lba
== 0xffffffff)) {
1648 /* Some buggy (usb cardreader) devices return an lba of
1649 0xffffffff when the want to report a size of 0 (with
1650 which they really mean no media is present) */
1652 sdkp
->physical_block_size
= sector_size
;
1656 if ((sizeof(sdkp
->capacity
) == 4) && (lba
== 0xffffffff)) {
1657 sd_printk(KERN_ERR
, sdkp
, "Too big for this kernel. Use a "
1658 "kernel compiled with support for large block "
1664 sdkp
->capacity
= lba
+ 1;
1665 sdkp
->physical_block_size
= sector_size
;
1669 static int sd_try_rc16_first(struct scsi_device
*sdp
)
1671 if (sdp
->host
->max_cmd_len
< 16)
1673 if (sdp
->scsi_level
> SCSI_SPC_2
)
1675 if (scsi_device_protection(sdp
))
1681 * read disk capacity
1684 sd_read_capacity(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1687 struct scsi_device
*sdp
= sdkp
->device
;
1688 sector_t old_capacity
= sdkp
->capacity
;
1690 if (sd_try_rc16_first(sdp
)) {
1691 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1692 if (sector_size
== -EOVERFLOW
)
1694 if (sector_size
== -ENODEV
)
1696 if (sector_size
< 0)
1697 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1698 if (sector_size
< 0)
1701 sector_size
= read_capacity_10(sdkp
, sdp
, buffer
);
1702 if (sector_size
== -EOVERFLOW
)
1704 if (sector_size
< 0)
1706 if ((sizeof(sdkp
->capacity
) > 4) &&
1707 (sdkp
->capacity
> 0xffffffffULL
)) {
1708 int old_sector_size
= sector_size
;
1709 sd_printk(KERN_NOTICE
, sdkp
, "Very big device. "
1710 "Trying to use READ CAPACITY(16).\n");
1711 sector_size
= read_capacity_16(sdkp
, sdp
, buffer
);
1712 if (sector_size
< 0) {
1713 sd_printk(KERN_NOTICE
, sdkp
,
1714 "Using 0xffffffff as device size\n");
1715 sdkp
->capacity
= 1 + (sector_t
) 0xffffffff;
1716 sector_size
= old_sector_size
;
1722 /* Some devices are known to return the total number of blocks,
1723 * not the highest block number. Some devices have versions
1724 * which do this and others which do not. Some devices we might
1725 * suspect of doing this but we don't know for certain.
1727 * If we know the reported capacity is wrong, decrement it. If
1728 * we can only guess, then assume the number of blocks is even
1729 * (usually true but not always) and err on the side of lowering
1732 if (sdp
->fix_capacity
||
1733 (sdp
->guess_capacity
&& (sdkp
->capacity
& 0x01))) {
1734 sd_printk(KERN_INFO
, sdkp
, "Adjusting the sector count "
1735 "from its reported value: %llu\n",
1736 (unsigned long long) sdkp
->capacity
);
1741 if (sector_size
== 0) {
1743 sd_printk(KERN_NOTICE
, sdkp
, "Sector size 0 reported, "
1747 if (sector_size
!= 512 &&
1748 sector_size
!= 1024 &&
1749 sector_size
!= 2048 &&
1750 sector_size
!= 4096 &&
1751 sector_size
!= 256) {
1752 sd_printk(KERN_NOTICE
, sdkp
, "Unsupported sector size %d.\n",
1755 * The user might want to re-format the drive with
1756 * a supported sectorsize. Once this happens, it
1757 * would be relatively trivial to set the thing up.
1758 * For this reason, we leave the thing in the table.
1762 * set a bogus sector size so the normal read/write
1763 * logic in the block layer will eventually refuse any
1764 * request on this device without tripping over power
1765 * of two sector size assumptions
1769 blk_queue_logical_block_size(sdp
->request_queue
, sector_size
);
1772 char cap_str_2
[10], cap_str_10
[10];
1773 u64 sz
= (u64
)sdkp
->capacity
<< ilog2(sector_size
);
1775 string_get_size(sz
, STRING_UNITS_2
, cap_str_2
,
1777 string_get_size(sz
, STRING_UNITS_10
, cap_str_10
,
1778 sizeof(cap_str_10
));
1780 if (sdkp
->first_scan
|| old_capacity
!= sdkp
->capacity
) {
1781 sd_printk(KERN_NOTICE
, sdkp
,
1782 "%llu %d-byte logical blocks: (%s/%s)\n",
1783 (unsigned long long)sdkp
->capacity
,
1784 sector_size
, cap_str_10
, cap_str_2
);
1786 if (sdkp
->physical_block_size
!= sector_size
)
1787 sd_printk(KERN_NOTICE
, sdkp
,
1788 "%u-byte physical blocks\n",
1789 sdkp
->physical_block_size
);
1793 /* Rescale capacity to 512-byte units */
1794 if (sector_size
== 4096)
1795 sdkp
->capacity
<<= 3;
1796 else if (sector_size
== 2048)
1797 sdkp
->capacity
<<= 2;
1798 else if (sector_size
== 1024)
1799 sdkp
->capacity
<<= 1;
1800 else if (sector_size
== 256)
1801 sdkp
->capacity
>>= 1;
1803 blk_queue_physical_block_size(sdp
->request_queue
,
1804 sdkp
->physical_block_size
);
1805 sdkp
->device
->sector_size
= sector_size
;
1808 /* called with buffer of length 512 */
1810 sd_do_mode_sense(struct scsi_device
*sdp
, int dbd
, int modepage
,
1811 unsigned char *buffer
, int len
, struct scsi_mode_data
*data
,
1812 struct scsi_sense_hdr
*sshdr
)
1814 return scsi_mode_sense(sdp
, dbd
, modepage
, buffer
, len
,
1815 SD_TIMEOUT
, SD_MAX_RETRIES
, data
,
1820 * read write protect setting, if possible - called only in sd_revalidate_disk()
1821 * called with buffer of length SD_BUF_SIZE
1824 sd_read_write_protect_flag(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1827 struct scsi_device
*sdp
= sdkp
->device
;
1828 struct scsi_mode_data data
;
1829 int old_wp
= sdkp
->write_prot
;
1831 set_disk_ro(sdkp
->disk
, 0);
1832 if (sdp
->skip_ms_page_3f
) {
1833 sd_printk(KERN_NOTICE
, sdkp
, "Assuming Write Enabled\n");
1837 if (sdp
->use_192_bytes_for_3f
) {
1838 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 192, &data
, NULL
);
1841 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1842 * We have to start carefully: some devices hang if we ask
1843 * for more than is available.
1845 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 4, &data
, NULL
);
1848 * Second attempt: ask for page 0 When only page 0 is
1849 * implemented, a request for page 3F may return Sense Key
1850 * 5: Illegal Request, Sense Code 24: Invalid field in
1853 if (!scsi_status_is_good(res
))
1854 res
= sd_do_mode_sense(sdp
, 0, 0, buffer
, 4, &data
, NULL
);
1857 * Third attempt: ask 255 bytes, as we did earlier.
1859 if (!scsi_status_is_good(res
))
1860 res
= sd_do_mode_sense(sdp
, 0, 0x3F, buffer
, 255,
1864 if (!scsi_status_is_good(res
)) {
1865 sd_printk(KERN_WARNING
, sdkp
,
1866 "Test WP failed, assume Write Enabled\n");
1868 sdkp
->write_prot
= ((data
.device_specific
& 0x80) != 0);
1869 set_disk_ro(sdkp
->disk
, sdkp
->write_prot
);
1870 if (sdkp
->first_scan
|| old_wp
!= sdkp
->write_prot
) {
1871 sd_printk(KERN_NOTICE
, sdkp
, "Write Protect is %s\n",
1872 sdkp
->write_prot
? "on" : "off");
1873 sd_printk(KERN_DEBUG
, sdkp
,
1874 "Mode Sense: %02x %02x %02x %02x\n",
1875 buffer
[0], buffer
[1], buffer
[2], buffer
[3]);
1881 * sd_read_cache_type - called only from sd_revalidate_disk()
1882 * called with buffer of length SD_BUF_SIZE
1885 sd_read_cache_type(struct scsi_disk
*sdkp
, unsigned char *buffer
)
1888 struct scsi_device
*sdp
= sdkp
->device
;
1892 struct scsi_mode_data data
;
1893 struct scsi_sense_hdr sshdr
;
1894 int old_wce
= sdkp
->WCE
;
1895 int old_rcd
= sdkp
->RCD
;
1896 int old_dpofua
= sdkp
->DPOFUA
;
1898 if (sdp
->skip_ms_page_8
)
1901 if (sdp
->type
== TYPE_RBC
) {
1909 /* cautiously ask */
1910 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, 4, &data
, &sshdr
);
1912 if (!scsi_status_is_good(res
))
1915 if (!data
.header_length
) {
1917 sd_printk(KERN_ERR
, sdkp
, "Missing header in MODE_SENSE response\n");
1920 /* that went OK, now ask for the proper length */
1924 * We're only interested in the first three bytes, actually.
1925 * But the data cache page is defined for the first 20.
1932 /* Take headers and block descriptors into account */
1933 len
+= data
.header_length
+ data
.block_descriptor_length
;
1934 if (len
> SD_BUF_SIZE
)
1938 res
= sd_do_mode_sense(sdp
, dbd
, modepage
, buffer
, len
, &data
, &sshdr
);
1940 if (scsi_status_is_good(res
)) {
1941 int offset
= data
.header_length
+ data
.block_descriptor_length
;
1943 if (offset
>= SD_BUF_SIZE
- 2) {
1944 sd_printk(KERN_ERR
, sdkp
, "Malformed MODE SENSE response\n");
1948 if ((buffer
[offset
] & 0x3f) != modepage
) {
1949 sd_printk(KERN_ERR
, sdkp
, "Got wrong page\n");
1953 if (modepage
== 8) {
1954 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x04) != 0);
1955 sdkp
->RCD
= ((buffer
[offset
+ 2] & 0x01) != 0);
1957 sdkp
->WCE
= ((buffer
[offset
+ 2] & 0x01) == 0);
1961 sdkp
->DPOFUA
= (data
.device_specific
& 0x10) != 0;
1962 if (sdkp
->DPOFUA
&& !sdkp
->device
->use_10_for_rw
) {
1963 sd_printk(KERN_NOTICE
, sdkp
,
1964 "Uses READ/WRITE(6), disabling FUA\n");
1968 if (sdkp
->first_scan
|| old_wce
!= sdkp
->WCE
||
1969 old_rcd
!= sdkp
->RCD
|| old_dpofua
!= sdkp
->DPOFUA
)
1970 sd_printk(KERN_NOTICE
, sdkp
,
1971 "Write cache: %s, read cache: %s, %s\n",
1972 sdkp
->WCE
? "enabled" : "disabled",
1973 sdkp
->RCD
? "disabled" : "enabled",
1974 sdkp
->DPOFUA
? "supports DPO and FUA"
1975 : "doesn't support DPO or FUA");
1981 if (scsi_sense_valid(&sshdr
) &&
1982 sshdr
.sense_key
== ILLEGAL_REQUEST
&&
1983 sshdr
.asc
== 0x24 && sshdr
.ascq
== 0x0)
1984 /* Invalid field in CDB */
1985 sd_printk(KERN_NOTICE
, sdkp
, "Cache data unavailable\n");
1987 sd_printk(KERN_ERR
, sdkp
, "Asking for cache data failed\n");
1990 sd_printk(KERN_ERR
, sdkp
, "Assuming drive cache: write through\n");
1997 * The ATO bit indicates whether the DIF application tag is available
1998 * for use by the operating system.
2000 static void sd_read_app_tag_own(struct scsi_disk
*sdkp
, unsigned char *buffer
)
2003 struct scsi_device
*sdp
= sdkp
->device
;
2004 struct scsi_mode_data data
;
2005 struct scsi_sense_hdr sshdr
;
2007 if (sdp
->type
!= TYPE_DISK
)
2010 if (sdkp
->protection_type
== 0)
2013 res
= scsi_mode_sense(sdp
, 1, 0x0a, buffer
, 36, SD_TIMEOUT
,
2014 SD_MAX_RETRIES
, &data
, &sshdr
);
2016 if (!scsi_status_is_good(res
) || !data
.header_length
||
2018 sd_printk(KERN_WARNING
, sdkp
,
2019 "getting Control mode page failed, assume no ATO\n");
2021 if (scsi_sense_valid(&sshdr
))
2022 sd_print_sense_hdr(sdkp
, &sshdr
);
2027 offset
= data
.header_length
+ data
.block_descriptor_length
;
2029 if ((buffer
[offset
] & 0x3f) != 0x0a) {
2030 sd_printk(KERN_ERR
, sdkp
, "ATO Got wrong page\n");
2034 if ((buffer
[offset
+ 5] & 0x80) == 0)
2043 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2044 * @disk: disk to query
2046 static void sd_read_block_limits(struct scsi_disk
*sdkp
)
2048 struct request_queue
*q
= sdkp
->disk
->queue
;
2049 unsigned int sector_sz
= sdkp
->device
->sector_size
;
2050 const int vpd_len
= 64;
2051 unsigned char *buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2054 /* Block Limits VPD */
2055 scsi_get_vpd_page(sdkp
->device
, 0xb0, buffer
, vpd_len
))
2058 blk_queue_io_min(sdkp
->disk
->queue
,
2059 get_unaligned_be16(&buffer
[6]) * sector_sz
);
2060 blk_queue_io_opt(sdkp
->disk
->queue
,
2061 get_unaligned_be32(&buffer
[12]) * sector_sz
);
2063 /* Thin provisioning enabled and page length indicates TP support */
2064 if (sdkp
->thin_provisioning
&& buffer
[3] == 0x3c) {
2065 unsigned int lba_count
, desc_count
, granularity
;
2067 lba_count
= get_unaligned_be32(&buffer
[20]);
2068 desc_count
= get_unaligned_be32(&buffer
[24]);
2070 if (lba_count
&& desc_count
) {
2071 if (sdkp
->tpvpd
&& !sdkp
->tpu
)
2077 if (sdkp
->tpvpd
&& !sdkp
->tpu
&& !sdkp
->tpws
) {
2078 sd_printk(KERN_ERR
, sdkp
, "Thin provisioning is " \
2079 "enabled but neither TPU, nor TPWS are " \
2080 "set. Disabling discard!\n");
2085 q
->limits
.max_discard_sectors
=
2086 lba_count
* sector_sz
>> 9;
2088 granularity
= get_unaligned_be32(&buffer
[28]);
2091 q
->limits
.discard_granularity
= granularity
* sector_sz
;
2093 if (buffer
[32] & 0x80)
2094 q
->limits
.discard_alignment
=
2095 get_unaligned_be32(&buffer
[32]) & ~(1 << 31);
2103 * sd_read_block_characteristics - Query block dev. characteristics
2104 * @disk: disk to query
2106 static void sd_read_block_characteristics(struct scsi_disk
*sdkp
)
2108 unsigned char *buffer
;
2110 const int vpd_len
= 64;
2112 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2115 /* Block Device Characteristics VPD */
2116 scsi_get_vpd_page(sdkp
->device
, 0xb1, buffer
, vpd_len
))
2119 rot
= get_unaligned_be16(&buffer
[4]);
2122 queue_flag_set_unlocked(QUEUE_FLAG_NONROT
, sdkp
->disk
->queue
);
2129 * sd_read_thin_provisioning - Query thin provisioning VPD page
2130 * @disk: disk to query
2132 static void sd_read_thin_provisioning(struct scsi_disk
*sdkp
)
2134 unsigned char *buffer
;
2135 const int vpd_len
= 8;
2137 if (sdkp
->thin_provisioning
== 0)
2140 buffer
= kmalloc(vpd_len
, GFP_KERNEL
);
2142 if (!buffer
|| scsi_get_vpd_page(sdkp
->device
, 0xb2, buffer
, vpd_len
))
2146 sdkp
->tpu
= (buffer
[5] >> 7) & 1; /* UNMAP */
2147 sdkp
->tpws
= (buffer
[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2153 static int sd_try_extended_inquiry(struct scsi_device
*sdp
)
2156 * Although VPD inquiries can go to SCSI-2 type devices,
2157 * some USB ones crash on receiving them, and the pages
2158 * we currently ask for are for SPC-3 and beyond
2160 if (sdp
->scsi_level
> SCSI_SPC_2
)
2166 * sd_revalidate_disk - called the first time a new disk is seen,
2167 * performs disk spin up, read_capacity, etc.
2168 * @disk: struct gendisk we care about
2170 static int sd_revalidate_disk(struct gendisk
*disk
)
2172 struct scsi_disk
*sdkp
= scsi_disk(disk
);
2173 struct scsi_device
*sdp
= sdkp
->device
;
2174 unsigned char *buffer
;
2177 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO
, sdkp
,
2178 "sd_revalidate_disk\n"));
2181 * If the device is offline, don't try and read capacity or any
2182 * of the other niceties.
2184 if (!scsi_device_online(sdp
))
2187 buffer
= kmalloc(SD_BUF_SIZE
, GFP_KERNEL
);
2189 sd_printk(KERN_WARNING
, sdkp
, "sd_revalidate_disk: Memory "
2190 "allocation failure.\n");
2194 sd_spinup_disk(sdkp
);
2197 * Without media there is no reason to ask; moreover, some devices
2198 * react badly if we do.
2200 if (sdkp
->media_present
) {
2201 sd_read_capacity(sdkp
, buffer
);
2203 if (sd_try_extended_inquiry(sdp
)) {
2204 sd_read_thin_provisioning(sdkp
);
2205 sd_read_block_limits(sdkp
);
2206 sd_read_block_characteristics(sdkp
);
2209 sd_read_write_protect_flag(sdkp
, buffer
);
2210 sd_read_cache_type(sdkp
, buffer
);
2211 sd_read_app_tag_own(sdkp
, buffer
);
2214 sdkp
->first_scan
= 0;
2217 * We now have all cache related info, determine how we deal
2218 * with flush requests.
2226 blk_queue_flush(sdkp
->disk
->queue
, flush
);
2228 set_capacity(disk
, sdkp
->capacity
);
2236 * sd_unlock_native_capacity - unlock native capacity
2237 * @disk: struct gendisk to set capacity for
2239 * Block layer calls this function if it detects that partitions
2240 * on @disk reach beyond the end of the device. If the SCSI host
2241 * implements ->unlock_native_capacity() method, it's invoked to
2242 * give it a chance to adjust the device capacity.
2245 * Defined by block layer. Might sleep.
2247 static void sd_unlock_native_capacity(struct gendisk
*disk
)
2249 struct scsi_device
*sdev
= scsi_disk(disk
)->device
;
2251 if (sdev
->host
->hostt
->unlock_native_capacity
)
2252 sdev
->host
->hostt
->unlock_native_capacity(sdev
);
2256 * sd_format_disk_name - format disk name
2257 * @prefix: name prefix - ie. "sd" for SCSI disks
2258 * @index: index of the disk to format name for
2259 * @buf: output buffer
2260 * @buflen: length of the output buffer
2262 * SCSI disk names starts at sda. The 26th device is sdz and the
2263 * 27th is sdaa. The last one for two lettered suffix is sdzz
2264 * which is followed by sdaaa.
2266 * This is basically 26 base counting with one extra 'nil' entry
2267 * at the beginning from the second digit on and can be
2268 * determined using similar method as 26 base conversion with the
2269 * index shifted -1 after each digit is computed.
2275 * 0 on success, -errno on failure.
2277 static int sd_format_disk_name(char *prefix
, int index
, char *buf
, int buflen
)
2279 const int base
= 'z' - 'a' + 1;
2280 char *begin
= buf
+ strlen(prefix
);
2281 char *end
= buf
+ buflen
;
2291 *--p
= 'a' + (index
% unit
);
2292 index
= (index
/ unit
) - 1;
2293 } while (index
>= 0);
2295 memmove(begin
, p
, end
- p
);
2296 memcpy(buf
, prefix
, strlen(prefix
));
2302 * The asynchronous part of sd_probe
2304 static void sd_probe_async(void *data
, async_cookie_t cookie
)
2306 struct scsi_disk
*sdkp
= data
;
2307 struct scsi_device
*sdp
;
2314 index
= sdkp
->index
;
2315 dev
= &sdp
->sdev_gendev
;
2317 gd
->major
= sd_major((index
& 0xf0) >> 4);
2318 gd
->first_minor
= ((index
& 0xf) << 4) | (index
& 0xfff00);
2319 gd
->minors
= SD_MINORS
;
2321 gd
->fops
= &sd_fops
;
2322 gd
->private_data
= &sdkp
->driver
;
2323 gd
->queue
= sdkp
->device
->request_queue
;
2325 /* defaults, until the device tells us otherwise */
2326 sdp
->sector_size
= 512;
2328 sdkp
->media_present
= 1;
2329 sdkp
->write_prot
= 0;
2333 sdkp
->first_scan
= 1;
2335 sd_revalidate_disk(gd
);
2337 blk_queue_prep_rq(sdp
->request_queue
, sd_prep_fn
);
2338 blk_queue_unprep_rq(sdp
->request_queue
, sd_unprep_fn
);
2340 gd
->driverfs_dev
= &sdp
->sdev_gendev
;
2341 gd
->flags
= GENHD_FL_EXT_DEVT
;
2343 gd
->flags
|= GENHD_FL_REMOVABLE
;
2346 sd_dif_config_host(sdkp
);
2348 sd_revalidate_disk(gd
);
2350 sd_printk(KERN_NOTICE
, sdkp
, "Attached SCSI %sdisk\n",
2351 sdp
->removable
? "removable " : "");
2352 scsi_autopm_put_device(sdp
);
2353 put_device(&sdkp
->dev
);
2357 * sd_probe - called during driver initialization and whenever a
2358 * new scsi device is attached to the system. It is called once
2359 * for each scsi device (not just disks) present.
2360 * @dev: pointer to device object
2362 * Returns 0 if successful (or not interested in this scsi device
2363 * (e.g. scanner)); 1 when there is an error.
2365 * Note: this function is invoked from the scsi mid-level.
2366 * This function sets up the mapping between a given
2367 * <host,channel,id,lun> (found in sdp) and new device name
2368 * (e.g. /dev/sda). More precisely it is the block device major
2369 * and minor number that is chosen here.
2371 * Assume sd_attach is not re-entrant (for time being)
2372 * Also think about sd_attach() and sd_remove() running coincidentally.
2374 static int sd_probe(struct device
*dev
)
2376 struct scsi_device
*sdp
= to_scsi_device(dev
);
2377 struct scsi_disk
*sdkp
;
2383 if (sdp
->type
!= TYPE_DISK
&& sdp
->type
!= TYPE_MOD
&& sdp
->type
!= TYPE_RBC
)
2386 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO
, sdp
,
2390 sdkp
= kzalloc(sizeof(*sdkp
), GFP_KERNEL
);
2394 gd
= alloc_disk(SD_MINORS
);
2399 if (!ida_pre_get(&sd_index_ida
, GFP_KERNEL
))
2402 spin_lock(&sd_index_lock
);
2403 error
= ida_get_new(&sd_index_ida
, &index
);
2404 spin_unlock(&sd_index_lock
);
2405 } while (error
== -EAGAIN
);
2410 if (index
>= SD_MAX_DISKS
) {
2412 sdev_printk(KERN_WARNING
, sdp
, "SCSI disk (sd) name space exhausted.\n");
2413 goto out_free_index
;
2416 error
= sd_format_disk_name("sd", index
, gd
->disk_name
, DISK_NAME_LEN
);
2418 goto out_free_index
;
2421 sdkp
->driver
= &sd_template
;
2423 sdkp
->index
= index
;
2424 atomic_set(&sdkp
->openers
, 0);
2425 sdkp
->previous_state
= 1;
2427 if (!sdp
->request_queue
->rq_timeout
) {
2428 if (sdp
->type
!= TYPE_MOD
)
2429 blk_queue_rq_timeout(sdp
->request_queue
, SD_TIMEOUT
);
2431 blk_queue_rq_timeout(sdp
->request_queue
,
2435 device_initialize(&sdkp
->dev
);
2436 sdkp
->dev
.parent
= dev
;
2437 sdkp
->dev
.class = &sd_disk_class
;
2438 dev_set_name(&sdkp
->dev
, dev_name(dev
));
2440 if (device_add(&sdkp
->dev
))
2441 goto out_free_index
;
2444 dev_set_drvdata(dev
, sdkp
);
2446 get_device(&sdkp
->dev
); /* prevent release before async_schedule */
2447 async_schedule(sd_probe_async
, sdkp
);
2452 spin_lock(&sd_index_lock
);
2453 ida_remove(&sd_index_ida
, index
);
2454 spin_unlock(&sd_index_lock
);
2464 * sd_remove - called whenever a scsi disk (previously recognized by
2465 * sd_probe) is detached from the system. It is called (potentially
2466 * multiple times) during sd module unload.
2467 * @sdp: pointer to mid level scsi device object
2469 * Note: this function is invoked from the scsi mid-level.
2470 * This function potentially frees up a device name (e.g. /dev/sdc)
2471 * that could be re-used by a subsequent sd_probe().
2472 * This function is not called when the built-in sd driver is "exit-ed".
2474 static int sd_remove(struct device
*dev
)
2476 struct scsi_disk
*sdkp
;
2478 sdkp
= dev_get_drvdata(dev
);
2479 scsi_autopm_get_device(sdkp
->device
);
2481 async_synchronize_full();
2482 blk_queue_prep_rq(sdkp
->device
->request_queue
, scsi_prep_fn
);
2483 blk_queue_unprep_rq(sdkp
->device
->request_queue
, NULL
);
2484 device_del(&sdkp
->dev
);
2485 del_gendisk(sdkp
->disk
);
2488 mutex_lock(&sd_ref_mutex
);
2489 dev_set_drvdata(dev
, NULL
);
2490 put_device(&sdkp
->dev
);
2491 mutex_unlock(&sd_ref_mutex
);
2497 * scsi_disk_release - Called to free the scsi_disk structure
2498 * @dev: pointer to embedded class device
2500 * sd_ref_mutex must be held entering this routine. Because it is
2501 * called on last put, you should always use the scsi_disk_get()
2502 * scsi_disk_put() helpers which manipulate the semaphore directly
2503 * and never do a direct put_device.
2505 static void scsi_disk_release(struct device
*dev
)
2507 struct scsi_disk
*sdkp
= to_scsi_disk(dev
);
2508 struct gendisk
*disk
= sdkp
->disk
;
2510 spin_lock(&sd_index_lock
);
2511 ida_remove(&sd_index_ida
, sdkp
->index
);
2512 spin_unlock(&sd_index_lock
);
2514 disk
->private_data
= NULL
;
2516 put_device(&sdkp
->device
->sdev_gendev
);
2521 static int sd_start_stop_device(struct scsi_disk
*sdkp
, int start
)
2523 unsigned char cmd
[6] = { START_STOP
}; /* START_VALID */
2524 struct scsi_sense_hdr sshdr
;
2525 struct scsi_device
*sdp
= sdkp
->device
;
2529 cmd
[4] |= 1; /* START */
2531 if (sdp
->start_stop_pwr_cond
)
2532 cmd
[4] |= start
? 1 << 4 : 3 << 4; /* Active or Standby */
2534 if (!scsi_device_online(sdp
))
2537 res
= scsi_execute_req(sdp
, cmd
, DMA_NONE
, NULL
, 0, &sshdr
,
2538 SD_TIMEOUT
, SD_MAX_RETRIES
, NULL
);
2540 sd_printk(KERN_WARNING
, sdkp
, "START_STOP FAILED\n");
2541 sd_print_result(sdkp
, res
);
2542 if (driver_byte(res
) & DRIVER_SENSE
)
2543 sd_print_sense_hdr(sdkp
, &sshdr
);
2550 * Send a SYNCHRONIZE CACHE instruction down to the device through
2551 * the normal SCSI command structure. Wait for the command to
2554 static void sd_shutdown(struct device
*dev
)
2556 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2559 return; /* this can happen */
2562 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2563 sd_sync_cache(sdkp
);
2566 if (system_state
!= SYSTEM_RESTART
&& sdkp
->device
->manage_start_stop
) {
2567 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2568 sd_start_stop_device(sdkp
, 0);
2571 scsi_disk_put(sdkp
);
2574 static int sd_suspend(struct device
*dev
, pm_message_t mesg
)
2576 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2580 return 0; /* this can happen */
2583 sd_printk(KERN_NOTICE
, sdkp
, "Synchronizing SCSI cache\n");
2584 ret
= sd_sync_cache(sdkp
);
2589 if ((mesg
.event
& PM_EVENT_SLEEP
) && sdkp
->device
->manage_start_stop
) {
2590 sd_printk(KERN_NOTICE
, sdkp
, "Stopping disk\n");
2591 ret
= sd_start_stop_device(sdkp
, 0);
2595 scsi_disk_put(sdkp
);
2599 static int sd_resume(struct device
*dev
)
2601 struct scsi_disk
*sdkp
= scsi_disk_get_from_dev(dev
);
2604 if (!sdkp
->device
->manage_start_stop
)
2607 sd_printk(KERN_NOTICE
, sdkp
, "Starting disk\n");
2608 ret
= sd_start_stop_device(sdkp
, 1);
2611 scsi_disk_put(sdkp
);
2616 * init_sd - entry point for this driver (both when built in or when
2619 * Note: this function registers this driver with the scsi mid-level.
2621 static int __init
init_sd(void)
2623 int majors
= 0, i
, err
;
2625 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2627 for (i
= 0; i
< SD_MAJORS
; i
++)
2628 if (register_blkdev(sd_major(i
), "sd") == 0)
2634 err
= class_register(&sd_disk_class
);
2638 err
= scsi_register_driver(&sd_template
.gendrv
);
2642 sd_cdb_cache
= kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE
,
2644 if (!sd_cdb_cache
) {
2645 printk(KERN_ERR
"sd: can't init extended cdb cache\n");
2649 sd_cdb_pool
= mempool_create_slab_pool(SD_MEMPOOL_SIZE
, sd_cdb_cache
);
2651 printk(KERN_ERR
"sd: can't init extended cdb pool\n");
2658 kmem_cache_destroy(sd_cdb_cache
);
2661 class_unregister(&sd_disk_class
);
2663 for (i
= 0; i
< SD_MAJORS
; i
++)
2664 unregister_blkdev(sd_major(i
), "sd");
2669 * exit_sd - exit point for this driver (when it is a module).
2671 * Note: this function unregisters this driver from the scsi mid-level.
2673 static void __exit
exit_sd(void)
2677 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2679 mempool_destroy(sd_cdb_pool
);
2680 kmem_cache_destroy(sd_cdb_cache
);
2682 scsi_unregister_driver(&sd_template
.gendrv
);
2683 class_unregister(&sd_disk_class
);
2685 for (i
= 0; i
< SD_MAJORS
; i
++)
2686 unregister_blkdev(sd_major(i
), "sd");
2689 module_init(init_sd
);
2690 module_exit(exit_sd
);
2692 static void sd_print_sense_hdr(struct scsi_disk
*sdkp
,
2693 struct scsi_sense_hdr
*sshdr
)
2695 sd_printk(KERN_INFO
, sdkp
, " ");
2696 scsi_show_sense_hdr(sshdr
);
2697 sd_printk(KERN_INFO
, sdkp
, " ");
2698 scsi_show_extd_sense(sshdr
->asc
, sshdr
->ascq
);
2701 static void sd_print_result(struct scsi_disk
*sdkp
, int result
)
2703 sd_printk(KERN_INFO
, sdkp
, " ");
2704 scsi_show_result(result
);