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 void sd_unlock_native_capacity(struct gendisk *disk);
101 static int sd_probe(struct device *);
102 static int sd_remove(struct device *);
103 static void sd_shutdown(struct device *);
104 static int sd_suspend(struct device *, pm_message_t state);
105 static int sd_resume(struct device *);
106 static void sd_rescan(struct device *);
107 static int sd_done(struct scsi_cmnd *);
108 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
109 static void scsi_disk_release(struct device *cdev);
110 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
111 static void sd_print_result(struct scsi_disk *, int);
113 static DEFINE_SPINLOCK(sd_index_lock);
114 static DEFINE_IDA(sd_index_ida);
116 /* This semaphore is used to mediate the 0->1 reference get in the
117 * face of object destruction (i.e. we can't allow a get on an
118 * object after last put) */
119 static DEFINE_MUTEX(sd_ref_mutex);
121 struct kmem_cache *sd_cdb_cache;
122 mempool_t *sd_cdb_pool;
124 static const char *sd_cache_types[] = {
125 "write through", "none", "write back",
126 "write back, no read (daft)"
130 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
131 const char *buf, size_t count)
133 int i, ct = -1, rcd, wce, sp;
134 struct scsi_disk *sdkp = to_scsi_disk(dev);
135 struct scsi_device *sdp = sdkp->device;
138 struct scsi_mode_data data;
139 struct scsi_sense_hdr sshdr;
142 if (sdp->type != TYPE_DISK)
143 /* no cache control on RBC devices; theoretically they
144 * can do it, but there's probably so many exceptions
145 * it's not worth the risk */
148 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
149 const int len = strlen(sd_cache_types[i]);
150 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
158 rcd = ct & 0x01 ? 1 : 0;
159 wce = ct & 0x02 ? 1 : 0;
160 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
161 SD_MAX_RETRIES, &data, NULL))
163 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
164 data.block_descriptor_length);
165 buffer_data = buffer + data.header_length +
166 data.block_descriptor_length;
167 buffer_data[2] &= ~0x05;
168 buffer_data[2] |= wce << 2 | rcd;
169 sp = buffer_data[0] & 0x80 ? 1 : 0;
171 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
172 SD_MAX_RETRIES, &data, &sshdr)) {
173 if (scsi_sense_valid(&sshdr))
174 sd_print_sense_hdr(sdkp, &sshdr);
177 revalidate_disk(sdkp->disk);
182 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
183 const char *buf, size_t count)
185 struct scsi_disk *sdkp = to_scsi_disk(dev);
186 struct scsi_device *sdp = sdkp->device;
188 if (!capable(CAP_SYS_ADMIN))
191 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
197 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
198 const char *buf, size_t count)
200 struct scsi_disk *sdkp = to_scsi_disk(dev);
201 struct scsi_device *sdp = sdkp->device;
203 if (!capable(CAP_SYS_ADMIN))
206 if (sdp->type != TYPE_DISK)
209 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
215 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
218 struct scsi_disk *sdkp = to_scsi_disk(dev);
219 int ct = sdkp->RCD + 2*sdkp->WCE;
221 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
225 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
227 struct scsi_disk *sdkp = to_scsi_disk(dev);
229 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
233 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
236 struct scsi_disk *sdkp = to_scsi_disk(dev);
237 struct scsi_device *sdp = sdkp->device;
239 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
243 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
246 struct scsi_disk *sdkp = to_scsi_disk(dev);
248 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
252 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
255 struct scsi_disk *sdkp = to_scsi_disk(dev);
257 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
261 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
264 struct scsi_disk *sdkp = to_scsi_disk(dev);
266 return snprintf(buf, 20, "%u\n", sdkp->ATO);
270 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
273 struct scsi_disk *sdkp = to_scsi_disk(dev);
275 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
278 static struct device_attribute sd_disk_attrs[] = {
279 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
280 sd_store_cache_type),
281 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
282 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
283 sd_store_allow_restart),
284 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
285 sd_store_manage_start_stop),
286 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
287 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
288 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
292 static struct class sd_disk_class = {
294 .owner = THIS_MODULE,
295 .dev_release = scsi_disk_release,
296 .dev_attrs = sd_disk_attrs,
299 static struct scsi_driver sd_template = {
300 .owner = THIS_MODULE,
305 .suspend = sd_suspend,
307 .shutdown = sd_shutdown,
314 * Device no to disk mapping:
316 * major disc2 disc p1
317 * |............|.............|....|....| <- dev_t
320 * Inside a major, we have 16k disks, however mapped non-
321 * contiguously. The first 16 disks are for major0, the next
322 * ones with major1, ... Disk 256 is for major0 again, disk 272
324 * As we stay compatible with our numbering scheme, we can reuse
325 * the well-know SCSI majors 8, 65--71, 136--143.
327 static int sd_major(int major_idx)
331 return SCSI_DISK0_MAJOR;
333 return SCSI_DISK1_MAJOR + major_idx - 1;
335 return SCSI_DISK8_MAJOR + major_idx - 8;
338 return 0; /* shut up gcc */
342 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
344 struct scsi_disk *sdkp = NULL;
346 if (disk->private_data) {
347 sdkp = scsi_disk(disk);
348 if (scsi_device_get(sdkp->device) == 0)
349 get_device(&sdkp->dev);
356 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
358 struct scsi_disk *sdkp;
360 mutex_lock(&sd_ref_mutex);
361 sdkp = __scsi_disk_get(disk);
362 mutex_unlock(&sd_ref_mutex);
366 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
368 struct scsi_disk *sdkp;
370 mutex_lock(&sd_ref_mutex);
371 sdkp = dev_get_drvdata(dev);
373 sdkp = __scsi_disk_get(sdkp->disk);
374 mutex_unlock(&sd_ref_mutex);
378 static void scsi_disk_put(struct scsi_disk *sdkp)
380 struct scsi_device *sdev = sdkp->device;
382 mutex_lock(&sd_ref_mutex);
383 put_device(&sdkp->dev);
384 scsi_device_put(sdev);
385 mutex_unlock(&sd_ref_mutex);
388 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
390 unsigned int prot_op = SCSI_PROT_NORMAL;
391 unsigned int dix = scsi_prot_sg_count(scmd);
393 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
395 prot_op = SCSI_PROT_READ_PASS;
396 else if (dif && !dix)
397 prot_op = SCSI_PROT_READ_STRIP;
398 else if (!dif && dix)
399 prot_op = SCSI_PROT_READ_INSERT;
402 prot_op = SCSI_PROT_WRITE_PASS;
403 else if (dif && !dix)
404 prot_op = SCSI_PROT_WRITE_INSERT;
405 else if (!dif && dix)
406 prot_op = SCSI_PROT_WRITE_STRIP;
409 scsi_set_prot_op(scmd, prot_op);
410 scsi_set_prot_type(scmd, dif);
414 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
415 * @sdp: scsi device to operate one
416 * @rq: Request to prepare
418 * Will issue either UNMAP or WRITE SAME(16) depending on preference
419 * indicated by target device.
421 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
423 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
424 struct bio *bio = rq->bio;
425 sector_t sector = bio->bi_sector;
426 unsigned int nr_sectors = bio_sectors(bio);
431 if (sdkp->device->sector_size == 4096) {
436 rq->cmd_type = REQ_TYPE_BLOCK_PC;
437 rq->timeout = SD_TIMEOUT;
439 memset(rq->cmd, 0, rq->cmd_len);
441 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
443 return BLKPREP_DEFER;
446 char *buf = page_address(page);
452 put_unaligned_be16(6 + 16, &buf[0]);
453 put_unaligned_be16(16, &buf[2]);
454 put_unaligned_be64(sector, &buf[8]);
455 put_unaligned_be32(nr_sectors, &buf[16]);
460 rq->cmd[0] = WRITE_SAME_16;
461 rq->cmd[1] = 0x8; /* UNMAP */
462 put_unaligned_be64(sector, &rq->cmd[2]);
463 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
465 len = sdkp->device->sector_size;
468 blk_add_request_payload(rq, page, len);
469 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
470 rq->buffer = page_address(page);
474 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
476 /* for now, we use REQ_TYPE_BLOCK_PC. */
477 rq->cmd_type = REQ_TYPE_BLOCK_PC;
478 rq->timeout = SD_TIMEOUT;
479 rq->retries = SD_MAX_RETRIES;
480 rq->cmd[0] = SYNCHRONIZE_CACHE;
483 return scsi_setup_blk_pc_cmnd(sdp, rq);
486 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
488 if (rq->cmd_flags & REQ_DISCARD)
489 __free_page(virt_to_page(rq->buffer));
493 * sd_init_command - build a scsi (read or write) command from
494 * information in the request structure.
495 * @SCpnt: pointer to mid-level's per scsi command structure that
496 * contains request and into which the scsi command is written
498 * Returns 1 if successful and 0 if error (or cannot be done now).
500 static int sd_prep_fn(struct request_queue *q, struct request *rq)
502 struct scsi_cmnd *SCpnt;
503 struct scsi_device *sdp = q->queuedata;
504 struct gendisk *disk = rq->rq_disk;
505 struct scsi_disk *sdkp;
506 sector_t block = blk_rq_pos(rq);
508 unsigned int this_count = blk_rq_sectors(rq);
510 unsigned char protect;
513 * Discard request come in as REQ_TYPE_FS but we turn them into
514 * block PC requests to make life easier.
516 if (rq->cmd_flags & REQ_DISCARD) {
517 ret = scsi_setup_discard_cmnd(sdp, rq);
519 } else if (rq->cmd_flags & REQ_FLUSH) {
520 ret = scsi_setup_flush_cmnd(sdp, rq);
522 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
523 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
525 } else if (rq->cmd_type != REQ_TYPE_FS) {
529 ret = scsi_setup_fs_cmnd(sdp, rq);
530 if (ret != BLKPREP_OK)
533 sdkp = scsi_disk(disk);
535 /* from here on until we're complete, any goto out
536 * is used for a killable error condition */
539 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
540 "sd_init_command: block=%llu, "
542 (unsigned long long)block,
545 if (!sdp || !scsi_device_online(sdp) ||
546 block + blk_rq_sectors(rq) > get_capacity(disk)) {
547 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
548 "Finishing %u sectors\n",
549 blk_rq_sectors(rq)));
550 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
551 "Retry with 0x%p\n", SCpnt));
557 * quietly refuse to do anything to a changed disc until
558 * the changed bit has been reset
560 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
565 * Some SD card readers can't handle multi-sector accesses which touch
566 * the last one or two hardware sectors. Split accesses as needed.
568 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
569 (sdp->sector_size / 512);
571 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
572 if (block < threshold) {
573 /* Access up to the threshold but not beyond */
574 this_count = threshold - block;
576 /* Access only a single hardware sector */
577 this_count = sdp->sector_size / 512;
581 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
582 (unsigned long long)block));
585 * If we have a 1K hardware sectorsize, prevent access to single
586 * 512 byte sectors. In theory we could handle this - in fact
587 * the scsi cdrom driver must be able to handle this because
588 * we typically use 1K blocksizes, and cdroms typically have
589 * 2K hardware sectorsizes. Of course, things are simpler
590 * with the cdrom, since it is read-only. For performance
591 * reasons, the filesystems should be able to handle this
592 * and not force the scsi disk driver to use bounce buffers
595 if (sdp->sector_size == 1024) {
596 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
597 scmd_printk(KERN_ERR, SCpnt,
598 "Bad block number requested\n");
602 this_count = this_count >> 1;
605 if (sdp->sector_size == 2048) {
606 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
607 scmd_printk(KERN_ERR, SCpnt,
608 "Bad block number requested\n");
612 this_count = this_count >> 2;
615 if (sdp->sector_size == 4096) {
616 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
617 scmd_printk(KERN_ERR, SCpnt,
618 "Bad block number requested\n");
622 this_count = this_count >> 3;
625 if (rq_data_dir(rq) == WRITE) {
626 if (!sdp->writeable) {
629 SCpnt->cmnd[0] = WRITE_6;
630 SCpnt->sc_data_direction = DMA_TO_DEVICE;
632 if (blk_integrity_rq(rq) &&
633 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
636 } else if (rq_data_dir(rq) == READ) {
637 SCpnt->cmnd[0] = READ_6;
638 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
640 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
644 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
645 "%s %d/%u 512 byte blocks.\n",
646 (rq_data_dir(rq) == WRITE) ?
647 "writing" : "reading", this_count,
648 blk_rq_sectors(rq)));
650 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
651 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
657 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
658 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
660 if (unlikely(SCpnt->cmnd == NULL)) {
665 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
666 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
667 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
668 SCpnt->cmnd[7] = 0x18;
669 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
670 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
673 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
674 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
675 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
676 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
677 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
678 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
679 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
680 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
682 /* Expected Indirect LBA */
683 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
684 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
685 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
686 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
688 /* Transfer length */
689 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
690 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
691 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
692 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
693 } else if (block > 0xffffffff) {
694 SCpnt->cmnd[0] += READ_16 - READ_6;
695 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
696 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
697 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
698 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
699 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
700 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
701 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
702 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
703 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
704 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
705 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
706 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
707 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
708 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
709 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
710 scsi_device_protection(SCpnt->device) ||
711 SCpnt->device->use_10_for_rw) {
712 if (this_count > 0xffff)
715 SCpnt->cmnd[0] += READ_10 - READ_6;
716 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
717 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
718 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
719 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
720 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
721 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
722 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
723 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
725 if (unlikely(rq->cmd_flags & REQ_FUA)) {
727 * This happens only if this drive failed
728 * 10byte rw command with ILLEGAL_REQUEST
729 * during operation and thus turned off
732 scmd_printk(KERN_ERR, SCpnt,
733 "FUA write on READ/WRITE(6) drive\n");
737 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
738 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
739 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
740 SCpnt->cmnd[4] = (unsigned char) this_count;
743 SCpnt->sdb.length = this_count * sdp->sector_size;
745 /* If DIF or DIX is enabled, tell HBA how to handle request */
746 if (host_dif || scsi_prot_sg_count(SCpnt))
747 sd_prot_op(SCpnt, host_dif);
750 * We shouldn't disconnect in the middle of a sector, so with a dumb
751 * host adapter, it's safe to assume that we can at least transfer
752 * this many bytes between each connect / disconnect.
754 SCpnt->transfersize = sdp->sector_size;
755 SCpnt->underflow = this_count << 9;
756 SCpnt->allowed = SD_MAX_RETRIES;
759 * This indicates that the command is ready from our end to be
764 return scsi_prep_return(q, rq, ret);
768 * sd_open - open a scsi disk device
769 * @inode: only i_rdev member may be used
770 * @filp: only f_mode and f_flags may be used
772 * Returns 0 if successful. Returns a negated errno value in case
775 * Note: This can be called from a user context (e.g. fsck(1) )
776 * or from within the kernel (e.g. as a result of a mount(1) ).
777 * In the latter case @inode and @filp carry an abridged amount
778 * of information as noted above.
780 static int sd_open(struct block_device *bdev, fmode_t mode)
782 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
783 struct scsi_device *sdev;
789 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
794 * If the device is in error recovery, wait until it is done.
795 * If the device is offline, then disallow any access to it.
798 if (!scsi_block_when_processing_errors(sdev))
801 if (sdev->removable || sdkp->write_prot)
802 check_disk_change(bdev);
805 * If the drive is empty, just let the open fail.
808 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
812 * If the device has the write protect tab set, have the open fail
813 * if the user expects to be able to write to the thing.
816 if (sdkp->write_prot && (mode & FMODE_WRITE))
820 * It is possible that the disk changing stuff resulted in
821 * the device being taken offline. If this is the case,
822 * report this to the user, and don't pretend that the
823 * open actually succeeded.
826 if (!scsi_device_online(sdev))
829 if (!sdkp->openers++ && sdev->removable) {
830 if (scsi_block_when_processing_errors(sdev))
831 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
842 * sd_release - invoked when the (last) close(2) is called on this
844 * @inode: only i_rdev member may be used
845 * @filp: only f_mode and f_flags may be used
849 * Note: may block (uninterruptible) if error recovery is underway
852 static int sd_release(struct gendisk *disk, fmode_t mode)
854 struct scsi_disk *sdkp = scsi_disk(disk);
855 struct scsi_device *sdev = sdkp->device;
857 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
859 if (!--sdkp->openers && sdev->removable) {
860 if (scsi_block_when_processing_errors(sdev))
861 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
865 * XXX and what if there are packets in flight and this close()
866 * XXX is followed by a "rmmod sd_mod"?
872 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
874 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
875 struct scsi_device *sdp = sdkp->device;
876 struct Scsi_Host *host = sdp->host;
879 /* default to most commonly used values */
880 diskinfo[0] = 0x40; /* 1 << 6 */
881 diskinfo[1] = 0x20; /* 1 << 5 */
882 diskinfo[2] = sdkp->capacity >> 11;
884 /* override with calculated, extended default, or driver values */
885 if (host->hostt->bios_param)
886 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
888 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
890 geo->heads = diskinfo[0];
891 geo->sectors = diskinfo[1];
892 geo->cylinders = diskinfo[2];
897 * sd_ioctl - process an ioctl
898 * @inode: only i_rdev/i_bdev members may be used
899 * @filp: only f_mode and f_flags may be used
900 * @cmd: ioctl command number
901 * @arg: this is third argument given to ioctl(2) system call.
902 * Often contains a pointer.
904 * Returns 0 if successful (some ioctls return postive numbers on
905 * success as well). Returns a negated errno value in case of error.
907 * Note: most ioctls are forward onto the block subsystem or further
908 * down in the scsi subsystem.
910 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
911 unsigned int cmd, unsigned long arg)
913 struct gendisk *disk = bdev->bd_disk;
914 struct scsi_device *sdp = scsi_disk(disk)->device;
915 void __user *p = (void __user *)arg;
918 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
919 disk->disk_name, cmd));
922 * If we are in the middle of error recovery, don't let anyone
923 * else try and use this device. Also, if error recovery fails, it
924 * may try and take the device offline, in which case all further
925 * access to the device is prohibited.
927 error = scsi_nonblockable_ioctl(sdp, cmd, p,
928 (mode & FMODE_NDELAY) != 0);
929 if (!scsi_block_when_processing_errors(sdp) || !error)
933 * Send SCSI addressing ioctls directly to mid level, send other
934 * ioctls to block level and then onto mid level if they can't be
938 case SCSI_IOCTL_GET_IDLUN:
939 case SCSI_IOCTL_GET_BUS_NUMBER:
940 return scsi_ioctl(sdp, cmd, p);
942 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
943 if (error != -ENOTTY)
946 return scsi_ioctl(sdp, cmd, p);
949 static void set_media_not_present(struct scsi_disk *sdkp)
951 sdkp->media_present = 0;
953 sdkp->device->changed = 1;
957 * sd_media_changed - check if our medium changed
958 * @disk: kernel device descriptor
960 * Returns 0 if not applicable or no change; 1 if change
962 * Note: this function is invoked from the block subsystem.
964 static int sd_media_changed(struct gendisk *disk)
966 struct scsi_disk *sdkp = scsi_disk(disk);
967 struct scsi_device *sdp = sdkp->device;
968 struct scsi_sense_hdr *sshdr = NULL;
971 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
977 * If the device is offline, don't send any commands - just pretend as
978 * if the command failed. If the device ever comes back online, we
979 * can deal with it then. It is only because of unrecoverable errors
980 * that we would ever take a device offline in the first place.
982 if (!scsi_device_online(sdp)) {
983 set_media_not_present(sdkp);
989 * Using TEST_UNIT_READY enables differentiation between drive with
990 * no cartridge loaded - NOT READY, drive with changed cartridge -
991 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
993 * Drives that auto spin down. eg iomega jaz 1G, will be started
994 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
995 * sd_revalidate() is called.
999 if (scsi_block_when_processing_errors(sdp)) {
1000 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1001 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1006 * Unable to test, unit probably not ready. This usually
1007 * means there is no disc in the drive. Mark as changed,
1008 * and we will figure it out later once the drive is
1011 if (retval || (scsi_sense_valid(sshdr) &&
1012 /* 0x3a is medium not present */
1013 sshdr->asc == 0x3a)) {
1014 set_media_not_present(sdkp);
1020 * For removable scsi disk we have to recognise the presence
1021 * of a disk in the drive. This is kept in the struct scsi_disk
1022 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1024 sdkp->media_present = 1;
1026 retval = sdp->changed;
1029 if (retval != sdkp->previous_state)
1030 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1031 sdkp->previous_state = retval;
1036 static int sd_sync_cache(struct scsi_disk *sdkp)
1039 struct scsi_device *sdp = sdkp->device;
1040 struct scsi_sense_hdr sshdr;
1042 if (!scsi_device_online(sdp))
1046 for (retries = 3; retries > 0; --retries) {
1047 unsigned char cmd[10] = { 0 };
1049 cmd[0] = SYNCHRONIZE_CACHE;
1051 * Leave the rest of the command zero to indicate
1054 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1055 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1061 sd_print_result(sdkp, res);
1062 if (driver_byte(res) & DRIVER_SENSE)
1063 sd_print_sense_hdr(sdkp, &sshdr);
1071 static void sd_rescan(struct device *dev)
1073 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1076 revalidate_disk(sdkp->disk);
1077 scsi_disk_put(sdkp);
1082 #ifdef CONFIG_COMPAT
1084 * This gets directly called from VFS. When the ioctl
1085 * is not recognized we go back to the other translation paths.
1087 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1088 unsigned int cmd, unsigned long arg)
1090 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1093 * If we are in the middle of error recovery, don't let anyone
1094 * else try and use this device. Also, if error recovery fails, it
1095 * may try and take the device offline, in which case all further
1096 * access to the device is prohibited.
1098 if (!scsi_block_when_processing_errors(sdev))
1101 if (sdev->host->hostt->compat_ioctl) {
1104 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1110 * Let the static ioctl translation table take care of it.
1112 return -ENOIOCTLCMD;
1116 static const struct block_device_operations sd_fops = {
1117 .owner = THIS_MODULE,
1119 .release = sd_release,
1120 .locked_ioctl = sd_ioctl,
1121 .getgeo = sd_getgeo,
1122 #ifdef CONFIG_COMPAT
1123 .compat_ioctl = sd_compat_ioctl,
1125 .media_changed = sd_media_changed,
1126 .revalidate_disk = sd_revalidate_disk,
1127 .unlock_native_capacity = sd_unlock_native_capacity,
1130 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1132 u64 start_lba = blk_rq_pos(scmd->request);
1133 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1137 if (scmd->request->cmd_type != REQ_TYPE_FS)
1140 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1141 SCSI_SENSE_BUFFERSIZE,
1146 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1149 if (scmd->device->sector_size < 512) {
1150 /* only legitimate sector_size here is 256 */
1154 /* be careful ... don't want any overflows */
1155 u64 factor = scmd->device->sector_size / 512;
1156 do_div(start_lba, factor);
1157 do_div(end_lba, factor);
1160 /* The bad lba was reported incorrectly, we have no idea where
1163 if (bad_lba < start_lba || bad_lba >= end_lba)
1166 /* This computation should always be done in terms of
1167 * the resolution of the device's medium.
1169 return (bad_lba - start_lba) * scmd->device->sector_size;
1173 * sd_done - bottom half handler: called when the lower level
1174 * driver has completed (successfully or otherwise) a scsi command.
1175 * @SCpnt: mid-level's per command structure.
1177 * Note: potentially run from within an ISR. Must not block.
1179 static int sd_done(struct scsi_cmnd *SCpnt)
1181 int result = SCpnt->result;
1182 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1183 struct scsi_sense_hdr sshdr;
1184 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1185 int sense_valid = 0;
1186 int sense_deferred = 0;
1189 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1191 sense_deferred = scsi_sense_is_deferred(&sshdr);
1193 #ifdef CONFIG_SCSI_LOGGING
1194 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1196 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1197 "sd_done: sb[respc,sk,asc,"
1198 "ascq]=%x,%x,%x,%x\n",
1199 sshdr.response_code,
1200 sshdr.sense_key, sshdr.asc,
1204 if (driver_byte(result) != DRIVER_SENSE &&
1205 (!sense_valid || sense_deferred))
1208 switch (sshdr.sense_key) {
1209 case HARDWARE_ERROR:
1211 good_bytes = sd_completed_bytes(SCpnt);
1213 case RECOVERED_ERROR:
1214 good_bytes = scsi_bufflen(SCpnt);
1217 /* This indicates a false check condition, so ignore it. An
1218 * unknown amount of data was transferred so treat it as an
1221 scsi_print_sense("sd", SCpnt);
1223 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1225 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1226 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1227 if (sshdr.asc == 0x10)
1228 good_bytes = sd_completed_bytes(SCpnt);
1234 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1235 sd_dif_complete(SCpnt, good_bytes);
1237 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1238 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1240 /* We have to print a failed command here as the
1241 * extended CDB gets freed before scsi_io_completion()
1245 scsi_print_command(SCpnt);
1247 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1255 static int media_not_present(struct scsi_disk *sdkp,
1256 struct scsi_sense_hdr *sshdr)
1259 if (!scsi_sense_valid(sshdr))
1261 /* not invoked for commands that could return deferred errors */
1262 if (sshdr->sense_key != NOT_READY &&
1263 sshdr->sense_key != UNIT_ATTENTION)
1265 if (sshdr->asc != 0x3A) /* medium not present */
1268 set_media_not_present(sdkp);
1273 * spinup disk - called only in sd_revalidate_disk()
1276 sd_spinup_disk(struct scsi_disk *sdkp)
1278 unsigned char cmd[10];
1279 unsigned long spintime_expire = 0;
1280 int retries, spintime;
1281 unsigned int the_result;
1282 struct scsi_sense_hdr sshdr;
1283 int sense_valid = 0;
1287 /* Spin up drives, as required. Only do this at boot time */
1288 /* Spinup needs to be done for module loads too. */
1293 cmd[0] = TEST_UNIT_READY;
1294 memset((void *) &cmd[1], 0, 9);
1296 the_result = scsi_execute_req(sdkp->device, cmd,
1299 SD_MAX_RETRIES, NULL);
1302 * If the drive has indicated to us that it
1303 * doesn't have any media in it, don't bother
1304 * with any more polling.
1306 if (media_not_present(sdkp, &sshdr))
1310 sense_valid = scsi_sense_valid(&sshdr);
1312 } while (retries < 3 &&
1313 (!scsi_status_is_good(the_result) ||
1314 ((driver_byte(the_result) & DRIVER_SENSE) &&
1315 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1317 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1318 /* no sense, TUR either succeeded or failed
1319 * with a status error */
1320 if(!spintime && !scsi_status_is_good(the_result)) {
1321 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1322 sd_print_result(sdkp, the_result);
1328 * The device does not want the automatic start to be issued.
1330 if (sdkp->device->no_start_on_add)
1333 if (sense_valid && sshdr.sense_key == NOT_READY) {
1334 if (sshdr.asc == 4 && sshdr.ascq == 3)
1335 break; /* manual intervention required */
1336 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1337 break; /* standby */
1338 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1339 break; /* unavailable */
1341 * Issue command to spin up drive when not ready
1344 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1345 cmd[0] = START_STOP;
1346 cmd[1] = 1; /* Return immediately */
1347 memset((void *) &cmd[2], 0, 8);
1348 cmd[4] = 1; /* Start spin cycle */
1349 if (sdkp->device->start_stop_pwr_cond)
1351 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1353 SD_TIMEOUT, SD_MAX_RETRIES,
1355 spintime_expire = jiffies + 100 * HZ;
1358 /* Wait 1 second for next try */
1363 * Wait for USB flash devices with slow firmware.
1364 * Yes, this sense key/ASC combination shouldn't
1365 * occur here. It's characteristic of these devices.
1367 } else if (sense_valid &&
1368 sshdr.sense_key == UNIT_ATTENTION &&
1369 sshdr.asc == 0x28) {
1371 spintime_expire = jiffies + 5 * HZ;
1374 /* Wait 1 second for next try */
1377 /* we don't understand the sense code, so it's
1378 * probably pointless to loop */
1380 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1381 sd_print_sense_hdr(sdkp, &sshdr);
1386 } while (spintime && time_before_eq(jiffies, spintime_expire));
1389 if (scsi_status_is_good(the_result))
1392 printk("not responding...\n");
1398 * Determine whether disk supports Data Integrity Field.
1400 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1402 struct scsi_device *sdp = sdkp->device;
1405 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1408 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1410 if (type == sdkp->protection_type || !sdkp->first_scan)
1413 sdkp->protection_type = type;
1415 if (type > SD_DIF_TYPE3_PROTECTION) {
1416 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1417 "protection type %u. Disabling disk!\n", type);
1422 if (scsi_host_dif_capable(sdp->host, type))
1423 sd_printk(KERN_NOTICE, sdkp,
1424 "Enabling DIF Type %u protection\n", type);
1426 sd_printk(KERN_NOTICE, sdkp,
1427 "Disabling DIF Type %u protection\n", type);
1430 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1431 struct scsi_sense_hdr *sshdr, int sense_valid,
1434 sd_print_result(sdkp, the_result);
1435 if (driver_byte(the_result) & DRIVER_SENSE)
1436 sd_print_sense_hdr(sdkp, sshdr);
1438 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1441 * Set dirty bit for removable devices if not ready -
1442 * sometimes drives will not report this properly.
1444 if (sdp->removable &&
1445 sense_valid && sshdr->sense_key == NOT_READY)
1449 * We used to set media_present to 0 here to indicate no media
1450 * in the drive, but some drives fail read capacity even with
1451 * media present, so we can't do that.
1453 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1457 #if RC16_LEN > SD_BUF_SIZE
1458 #error RC16_LEN must not be more than SD_BUF_SIZE
1461 #define READ_CAPACITY_RETRIES_ON_RESET 10
1463 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1464 unsigned char *buffer)
1466 unsigned char cmd[16];
1467 struct scsi_sense_hdr sshdr;
1468 int sense_valid = 0;
1470 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1471 unsigned int alignment;
1472 unsigned long long lba;
1473 unsigned sector_size;
1477 cmd[0] = SERVICE_ACTION_IN;
1478 cmd[1] = SAI_READ_CAPACITY_16;
1480 memset(buffer, 0, RC16_LEN);
1482 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1483 buffer, RC16_LEN, &sshdr,
1484 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1486 if (media_not_present(sdkp, &sshdr))
1490 sense_valid = scsi_sense_valid(&sshdr);
1492 sshdr.sense_key == ILLEGAL_REQUEST &&
1493 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1495 /* Invalid Command Operation Code or
1496 * Invalid Field in CDB, just retry
1497 * silently with RC10 */
1500 sshdr.sense_key == UNIT_ATTENTION &&
1501 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1502 /* Device reset might occur several times,
1503 * give it one more chance */
1504 if (--reset_retries > 0)
1509 } while (the_result && retries);
1512 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1513 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1517 sector_size = get_unaligned_be32(&buffer[8]);
1518 lba = get_unaligned_be64(&buffer[0]);
1520 sd_read_protection_type(sdkp, buffer);
1522 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1523 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1524 "kernel compiled with support for large block "
1530 /* Logical blocks per physical block exponent */
1531 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1533 /* Lowest aligned logical block */
1534 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1535 blk_queue_alignment_offset(sdp->request_queue, alignment);
1536 if (alignment && sdkp->first_scan)
1537 sd_printk(KERN_NOTICE, sdkp,
1538 "physical block alignment offset: %u\n", alignment);
1540 if (buffer[14] & 0x80) { /* TPE */
1541 struct request_queue *q = sdp->request_queue;
1543 sdkp->thin_provisioning = 1;
1544 q->limits.discard_granularity = sdkp->hw_sector_size;
1545 q->limits.max_discard_sectors = 0xffffffff;
1547 if (buffer[14] & 0x40) /* TPRZ */
1548 q->limits.discard_zeroes_data = 1;
1550 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1553 sdkp->capacity = lba + 1;
1557 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1558 unsigned char *buffer)
1560 unsigned char cmd[16];
1561 struct scsi_sense_hdr sshdr;
1562 int sense_valid = 0;
1564 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1566 unsigned sector_size;
1569 cmd[0] = READ_CAPACITY;
1570 memset(&cmd[1], 0, 9);
1571 memset(buffer, 0, 8);
1573 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1575 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1577 if (media_not_present(sdkp, &sshdr))
1581 sense_valid = scsi_sense_valid(&sshdr);
1583 sshdr.sense_key == UNIT_ATTENTION &&
1584 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1585 /* Device reset might occur several times,
1586 * give it one more chance */
1587 if (--reset_retries > 0)
1592 } while (the_result && retries);
1595 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1596 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1600 sector_size = get_unaligned_be32(&buffer[4]);
1601 lba = get_unaligned_be32(&buffer[0]);
1603 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1604 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1605 "kernel compiled with support for large block "
1611 sdkp->capacity = lba + 1;
1612 sdkp->hw_sector_size = sector_size;
1616 static int sd_try_rc16_first(struct scsi_device *sdp)
1618 if (sdp->host->max_cmd_len < 16)
1620 if (sdp->scsi_level > SCSI_SPC_2)
1622 if (scsi_device_protection(sdp))
1628 * read disk capacity
1631 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1634 struct scsi_device *sdp = sdkp->device;
1635 sector_t old_capacity = sdkp->capacity;
1637 if (sd_try_rc16_first(sdp)) {
1638 sector_size = read_capacity_16(sdkp, sdp, buffer);
1639 if (sector_size == -EOVERFLOW)
1641 if (sector_size == -ENODEV)
1643 if (sector_size < 0)
1644 sector_size = read_capacity_10(sdkp, sdp, buffer);
1645 if (sector_size < 0)
1648 sector_size = read_capacity_10(sdkp, sdp, buffer);
1649 if (sector_size == -EOVERFLOW)
1651 if (sector_size < 0)
1653 if ((sizeof(sdkp->capacity) > 4) &&
1654 (sdkp->capacity > 0xffffffffULL)) {
1655 int old_sector_size = sector_size;
1656 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1657 "Trying to use READ CAPACITY(16).\n");
1658 sector_size = read_capacity_16(sdkp, sdp, buffer);
1659 if (sector_size < 0) {
1660 sd_printk(KERN_NOTICE, sdkp,
1661 "Using 0xffffffff as device size\n");
1662 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1663 sector_size = old_sector_size;
1669 /* Some devices are known to return the total number of blocks,
1670 * not the highest block number. Some devices have versions
1671 * which do this and others which do not. Some devices we might
1672 * suspect of doing this but we don't know for certain.
1674 * If we know the reported capacity is wrong, decrement it. If
1675 * we can only guess, then assume the number of blocks is even
1676 * (usually true but not always) and err on the side of lowering
1679 if (sdp->fix_capacity ||
1680 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1681 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1682 "from its reported value: %llu\n",
1683 (unsigned long long) sdkp->capacity);
1688 if (sector_size == 0) {
1690 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1694 if (sector_size != 512 &&
1695 sector_size != 1024 &&
1696 sector_size != 2048 &&
1697 sector_size != 4096 &&
1698 sector_size != 256) {
1699 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1702 * The user might want to re-format the drive with
1703 * a supported sectorsize. Once this happens, it
1704 * would be relatively trivial to set the thing up.
1705 * For this reason, we leave the thing in the table.
1709 * set a bogus sector size so the normal read/write
1710 * logic in the block layer will eventually refuse any
1711 * request on this device without tripping over power
1712 * of two sector size assumptions
1716 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1719 char cap_str_2[10], cap_str_10[10];
1720 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1722 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1724 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1725 sizeof(cap_str_10));
1727 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1728 sd_printk(KERN_NOTICE, sdkp,
1729 "%llu %d-byte logical blocks: (%s/%s)\n",
1730 (unsigned long long)sdkp->capacity,
1731 sector_size, cap_str_10, cap_str_2);
1733 if (sdkp->hw_sector_size != sector_size)
1734 sd_printk(KERN_NOTICE, sdkp,
1735 "%u-byte physical blocks\n",
1736 sdkp->hw_sector_size);
1740 /* Rescale capacity to 512-byte units */
1741 if (sector_size == 4096)
1742 sdkp->capacity <<= 3;
1743 else if (sector_size == 2048)
1744 sdkp->capacity <<= 2;
1745 else if (sector_size == 1024)
1746 sdkp->capacity <<= 1;
1747 else if (sector_size == 256)
1748 sdkp->capacity >>= 1;
1750 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1751 sdkp->device->sector_size = sector_size;
1754 /* called with buffer of length 512 */
1756 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1757 unsigned char *buffer, int len, struct scsi_mode_data *data,
1758 struct scsi_sense_hdr *sshdr)
1760 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1761 SD_TIMEOUT, SD_MAX_RETRIES, data,
1766 * read write protect setting, if possible - called only in sd_revalidate_disk()
1767 * called with buffer of length SD_BUF_SIZE
1770 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1773 struct scsi_device *sdp = sdkp->device;
1774 struct scsi_mode_data data;
1775 int old_wp = sdkp->write_prot;
1777 set_disk_ro(sdkp->disk, 0);
1778 if (sdp->skip_ms_page_3f) {
1779 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1783 if (sdp->use_192_bytes_for_3f) {
1784 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1787 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1788 * We have to start carefully: some devices hang if we ask
1789 * for more than is available.
1791 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1794 * Second attempt: ask for page 0 When only page 0 is
1795 * implemented, a request for page 3F may return Sense Key
1796 * 5: Illegal Request, Sense Code 24: Invalid field in
1799 if (!scsi_status_is_good(res))
1800 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1803 * Third attempt: ask 255 bytes, as we did earlier.
1805 if (!scsi_status_is_good(res))
1806 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1810 if (!scsi_status_is_good(res)) {
1811 sd_printk(KERN_WARNING, sdkp,
1812 "Test WP failed, assume Write Enabled\n");
1814 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1815 set_disk_ro(sdkp->disk, sdkp->write_prot);
1816 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1817 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1818 sdkp->write_prot ? "on" : "off");
1819 sd_printk(KERN_DEBUG, sdkp,
1820 "Mode Sense: %02x %02x %02x %02x\n",
1821 buffer[0], buffer[1], buffer[2], buffer[3]);
1827 * sd_read_cache_type - called only from sd_revalidate_disk()
1828 * called with buffer of length SD_BUF_SIZE
1831 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1834 struct scsi_device *sdp = sdkp->device;
1838 struct scsi_mode_data data;
1839 struct scsi_sense_hdr sshdr;
1840 int old_wce = sdkp->WCE;
1841 int old_rcd = sdkp->RCD;
1842 int old_dpofua = sdkp->DPOFUA;
1844 if (sdp->skip_ms_page_8)
1847 if (sdp->type == TYPE_RBC) {
1855 /* cautiously ask */
1856 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1858 if (!scsi_status_is_good(res))
1861 if (!data.header_length) {
1863 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1866 /* that went OK, now ask for the proper length */
1870 * We're only interested in the first three bytes, actually.
1871 * But the data cache page is defined for the first 20.
1878 /* Take headers and block descriptors into account */
1879 len += data.header_length + data.block_descriptor_length;
1880 if (len > SD_BUF_SIZE)
1884 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1886 if (scsi_status_is_good(res)) {
1887 int offset = data.header_length + data.block_descriptor_length;
1889 if (offset >= SD_BUF_SIZE - 2) {
1890 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1894 if ((buffer[offset] & 0x3f) != modepage) {
1895 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1899 if (modepage == 8) {
1900 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1901 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1903 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1907 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1908 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1909 sd_printk(KERN_NOTICE, sdkp,
1910 "Uses READ/WRITE(6), disabling FUA\n");
1914 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1915 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1916 sd_printk(KERN_NOTICE, sdkp,
1917 "Write cache: %s, read cache: %s, %s\n",
1918 sdkp->WCE ? "enabled" : "disabled",
1919 sdkp->RCD ? "disabled" : "enabled",
1920 sdkp->DPOFUA ? "supports DPO and FUA"
1921 : "doesn't support DPO or FUA");
1927 if (scsi_sense_valid(&sshdr) &&
1928 sshdr.sense_key == ILLEGAL_REQUEST &&
1929 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1930 /* Invalid field in CDB */
1931 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1933 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1936 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1943 * The ATO bit indicates whether the DIF application tag is available
1944 * for use by the operating system.
1946 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1949 struct scsi_device *sdp = sdkp->device;
1950 struct scsi_mode_data data;
1951 struct scsi_sense_hdr sshdr;
1953 if (sdp->type != TYPE_DISK)
1956 if (sdkp->protection_type == 0)
1959 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1960 SD_MAX_RETRIES, &data, &sshdr);
1962 if (!scsi_status_is_good(res) || !data.header_length ||
1964 sd_printk(KERN_WARNING, sdkp,
1965 "getting Control mode page failed, assume no ATO\n");
1967 if (scsi_sense_valid(&sshdr))
1968 sd_print_sense_hdr(sdkp, &sshdr);
1973 offset = data.header_length + data.block_descriptor_length;
1975 if ((buffer[offset] & 0x3f) != 0x0a) {
1976 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1980 if ((buffer[offset + 5] & 0x80) == 0)
1989 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1990 * @disk: disk to query
1992 static void sd_read_block_limits(struct scsi_disk *sdkp)
1994 struct request_queue *q = sdkp->disk->queue;
1995 unsigned int sector_sz = sdkp->device->sector_size;
1996 const int vpd_len = 64;
1997 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2000 /* Block Limits VPD */
2001 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2004 blk_queue_io_min(sdkp->disk->queue,
2005 get_unaligned_be16(&buffer[6]) * sector_sz);
2006 blk_queue_io_opt(sdkp->disk->queue,
2007 get_unaligned_be32(&buffer[12]) * sector_sz);
2009 /* Thin provisioning enabled and page length indicates TP support */
2010 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2011 unsigned int lba_count, desc_count, granularity;
2013 lba_count = get_unaligned_be32(&buffer[20]);
2014 desc_count = get_unaligned_be32(&buffer[24]);
2017 q->limits.max_discard_sectors =
2018 lba_count * sector_sz >> 9;
2024 granularity = get_unaligned_be32(&buffer[28]);
2027 q->limits.discard_granularity = granularity * sector_sz;
2029 if (buffer[32] & 0x80)
2030 q->limits.discard_alignment =
2031 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2039 * sd_read_block_characteristics - Query block dev. characteristics
2040 * @disk: disk to query
2042 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2044 unsigned char *buffer;
2046 const int vpd_len = 64;
2048 buffer = kmalloc(vpd_len, GFP_KERNEL);
2051 /* Block Device Characteristics VPD */
2052 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2055 rot = get_unaligned_be16(&buffer[4]);
2058 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2064 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2067 * Although VPD inquiries can go to SCSI-2 type devices,
2068 * some USB ones crash on receiving them, and the pages
2069 * we currently ask for are for SPC-3 and beyond
2071 if (sdp->scsi_level > SCSI_SPC_2)
2077 * sd_revalidate_disk - called the first time a new disk is seen,
2078 * performs disk spin up, read_capacity, etc.
2079 * @disk: struct gendisk we care about
2081 static int sd_revalidate_disk(struct gendisk *disk)
2083 struct scsi_disk *sdkp = scsi_disk(disk);
2084 struct scsi_device *sdp = sdkp->device;
2085 unsigned char *buffer;
2088 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2089 "sd_revalidate_disk\n"));
2092 * If the device is offline, don't try and read capacity or any
2093 * of the other niceties.
2095 if (!scsi_device_online(sdp))
2098 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2100 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2101 "allocation failure.\n");
2105 sd_spinup_disk(sdkp);
2108 * Without media there is no reason to ask; moreover, some devices
2109 * react badly if we do.
2111 if (sdkp->media_present) {
2112 sd_read_capacity(sdkp, buffer);
2114 if (sd_try_extended_inquiry(sdp)) {
2115 sd_read_block_limits(sdkp);
2116 sd_read_block_characteristics(sdkp);
2119 sd_read_write_protect_flag(sdkp, buffer);
2120 sd_read_cache_type(sdkp, buffer);
2121 sd_read_app_tag_own(sdkp, buffer);
2124 sdkp->first_scan = 0;
2127 * We now have all cache related info, determine how we deal
2128 * with ordered requests. Note that as the current SCSI
2129 * dispatch function can alter request order, we cannot use
2130 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2133 ordered = sdkp->DPOFUA
2134 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2136 ordered = QUEUE_ORDERED_DRAIN;
2138 blk_queue_ordered(sdkp->disk->queue, ordered, NULL);
2140 set_capacity(disk, sdkp->capacity);
2148 * sd_unlock_native_capacity - unlock native capacity
2149 * @disk: struct gendisk to set capacity for
2151 * Block layer calls this function if it detects that partitions
2152 * on @disk reach beyond the end of the device. If the SCSI host
2153 * implements ->unlock_native_capacity() method, it's invoked to
2154 * give it a chance to adjust the device capacity.
2157 * Defined by block layer. Might sleep.
2159 static void sd_unlock_native_capacity(struct gendisk *disk)
2161 struct scsi_device *sdev = scsi_disk(disk)->device;
2163 if (sdev->host->hostt->unlock_native_capacity)
2164 sdev->host->hostt->unlock_native_capacity(sdev);
2168 * sd_format_disk_name - format disk name
2169 * @prefix: name prefix - ie. "sd" for SCSI disks
2170 * @index: index of the disk to format name for
2171 * @buf: output buffer
2172 * @buflen: length of the output buffer
2174 * SCSI disk names starts at sda. The 26th device is sdz and the
2175 * 27th is sdaa. The last one for two lettered suffix is sdzz
2176 * which is followed by sdaaa.
2178 * This is basically 26 base counting with one extra 'nil' entry
2179 * at the beginning from the second digit on and can be
2180 * determined using similar method as 26 base conversion with the
2181 * index shifted -1 after each digit is computed.
2187 * 0 on success, -errno on failure.
2189 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2191 const int base = 'z' - 'a' + 1;
2192 char *begin = buf + strlen(prefix);
2193 char *end = buf + buflen;
2203 *--p = 'a' + (index % unit);
2204 index = (index / unit) - 1;
2205 } while (index >= 0);
2207 memmove(begin, p, end - p);
2208 memcpy(buf, prefix, strlen(prefix));
2214 * The asynchronous part of sd_probe
2216 static void sd_probe_async(void *data, async_cookie_t cookie)
2218 struct scsi_disk *sdkp = data;
2219 struct scsi_device *sdp;
2226 index = sdkp->index;
2227 dev = &sdp->sdev_gendev;
2229 if (index < SD_MAX_DISKS) {
2230 gd->major = sd_major((index & 0xf0) >> 4);
2231 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2232 gd->minors = SD_MINORS;
2234 gd->fops = &sd_fops;
2235 gd->private_data = &sdkp->driver;
2236 gd->queue = sdkp->device->request_queue;
2238 /* defaults, until the device tells us otherwise */
2239 sdp->sector_size = 512;
2241 sdkp->media_present = 1;
2242 sdkp->write_prot = 0;
2246 sdkp->first_scan = 1;
2248 sd_revalidate_disk(gd);
2250 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2251 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2253 gd->driverfs_dev = &sdp->sdev_gendev;
2254 gd->flags = GENHD_FL_EXT_DEVT;
2256 gd->flags |= GENHD_FL_REMOVABLE;
2258 dev_set_drvdata(dev, sdkp);
2260 sd_dif_config_host(sdkp);
2262 sd_revalidate_disk(gd);
2264 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2265 sdp->removable ? "removable " : "");
2266 put_device(&sdkp->dev);
2270 * sd_probe - called during driver initialization and whenever a
2271 * new scsi device is attached to the system. It is called once
2272 * for each scsi device (not just disks) present.
2273 * @dev: pointer to device object
2275 * Returns 0 if successful (or not interested in this scsi device
2276 * (e.g. scanner)); 1 when there is an error.
2278 * Note: this function is invoked from the scsi mid-level.
2279 * This function sets up the mapping between a given
2280 * <host,channel,id,lun> (found in sdp) and new device name
2281 * (e.g. /dev/sda). More precisely it is the block device major
2282 * and minor number that is chosen here.
2284 * Assume sd_attach is not re-entrant (for time being)
2285 * Also think about sd_attach() and sd_remove() running coincidentally.
2287 static int sd_probe(struct device *dev)
2289 struct scsi_device *sdp = to_scsi_device(dev);
2290 struct scsi_disk *sdkp;
2296 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2299 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2303 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2307 gd = alloc_disk(SD_MINORS);
2312 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2315 spin_lock(&sd_index_lock);
2316 error = ida_get_new(&sd_index_ida, &index);
2317 spin_unlock(&sd_index_lock);
2318 } while (error == -EAGAIN);
2323 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2325 goto out_free_index;
2328 sdkp->driver = &sd_template;
2330 sdkp->index = index;
2332 sdkp->previous_state = 1;
2334 if (!sdp->request_queue->rq_timeout) {
2335 if (sdp->type != TYPE_MOD)
2336 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2338 blk_queue_rq_timeout(sdp->request_queue,
2342 device_initialize(&sdkp->dev);
2343 sdkp->dev.parent = &sdp->sdev_gendev;
2344 sdkp->dev.class = &sd_disk_class;
2345 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2347 if (device_add(&sdkp->dev))
2348 goto out_free_index;
2350 get_device(&sdp->sdev_gendev);
2352 get_device(&sdkp->dev); /* prevent release before async_schedule */
2353 async_schedule(sd_probe_async, sdkp);
2358 spin_lock(&sd_index_lock);
2359 ida_remove(&sd_index_ida, index);
2360 spin_unlock(&sd_index_lock);
2370 * sd_remove - called whenever a scsi disk (previously recognized by
2371 * sd_probe) is detached from the system. It is called (potentially
2372 * multiple times) during sd module unload.
2373 * @sdp: pointer to mid level scsi device object
2375 * Note: this function is invoked from the scsi mid-level.
2376 * This function potentially frees up a device name (e.g. /dev/sdc)
2377 * that could be re-used by a subsequent sd_probe().
2378 * This function is not called when the built-in sd driver is "exit-ed".
2380 static int sd_remove(struct device *dev)
2382 struct scsi_disk *sdkp;
2384 async_synchronize_full();
2385 sdkp = dev_get_drvdata(dev);
2386 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2387 device_del(&sdkp->dev);
2388 del_gendisk(sdkp->disk);
2391 mutex_lock(&sd_ref_mutex);
2392 dev_set_drvdata(dev, NULL);
2393 put_device(&sdkp->dev);
2394 mutex_unlock(&sd_ref_mutex);
2400 * scsi_disk_release - Called to free the scsi_disk structure
2401 * @dev: pointer to embedded class device
2403 * sd_ref_mutex must be held entering this routine. Because it is
2404 * called on last put, you should always use the scsi_disk_get()
2405 * scsi_disk_put() helpers which manipulate the semaphore directly
2406 * and never do a direct put_device.
2408 static void scsi_disk_release(struct device *dev)
2410 struct scsi_disk *sdkp = to_scsi_disk(dev);
2411 struct gendisk *disk = sdkp->disk;
2413 spin_lock(&sd_index_lock);
2414 ida_remove(&sd_index_ida, sdkp->index);
2415 spin_unlock(&sd_index_lock);
2417 disk->private_data = NULL;
2419 put_device(&sdkp->device->sdev_gendev);
2424 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2426 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2427 struct scsi_sense_hdr sshdr;
2428 struct scsi_device *sdp = sdkp->device;
2432 cmd[4] |= 1; /* START */
2434 if (sdp->start_stop_pwr_cond)
2435 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2437 if (!scsi_device_online(sdp))
2440 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2441 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2443 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2444 sd_print_result(sdkp, res);
2445 if (driver_byte(res) & DRIVER_SENSE)
2446 sd_print_sense_hdr(sdkp, &sshdr);
2453 * Send a SYNCHRONIZE CACHE instruction down to the device through
2454 * the normal SCSI command structure. Wait for the command to
2457 static void sd_shutdown(struct device *dev)
2459 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2462 return; /* this can happen */
2465 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2466 sd_sync_cache(sdkp);
2469 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2470 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2471 sd_start_stop_device(sdkp, 0);
2474 scsi_disk_put(sdkp);
2477 static int sd_suspend(struct device *dev, pm_message_t mesg)
2479 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2483 return 0; /* this can happen */
2486 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2487 ret = sd_sync_cache(sdkp);
2492 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2493 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2494 ret = sd_start_stop_device(sdkp, 0);
2498 scsi_disk_put(sdkp);
2502 static int sd_resume(struct device *dev)
2504 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2507 if (!sdkp->device->manage_start_stop)
2510 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2511 ret = sd_start_stop_device(sdkp, 1);
2514 scsi_disk_put(sdkp);
2519 * init_sd - entry point for this driver (both when built in or when
2522 * Note: this function registers this driver with the scsi mid-level.
2524 static int __init init_sd(void)
2526 int majors = 0, i, err;
2528 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2530 for (i = 0; i < SD_MAJORS; i++)
2531 if (register_blkdev(sd_major(i), "sd") == 0)
2537 err = class_register(&sd_disk_class);
2541 err = scsi_register_driver(&sd_template.gendrv);
2545 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2547 if (!sd_cdb_cache) {
2548 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2552 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2554 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2561 kmem_cache_destroy(sd_cdb_cache);
2564 class_unregister(&sd_disk_class);
2566 for (i = 0; i < SD_MAJORS; i++)
2567 unregister_blkdev(sd_major(i), "sd");
2572 * exit_sd - exit point for this driver (when it is a module).
2574 * Note: this function unregisters this driver from the scsi mid-level.
2576 static void __exit exit_sd(void)
2580 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2582 mempool_destroy(sd_cdb_pool);
2583 kmem_cache_destroy(sd_cdb_cache);
2585 scsi_unregister_driver(&sd_template.gendrv);
2586 class_unregister(&sd_disk_class);
2588 for (i = 0; i < SD_MAJORS; i++)
2589 unregister_blkdev(sd_major(i), "sd");
2592 module_init(init_sd);
2593 module_exit(exit_sd);
2595 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2596 struct scsi_sense_hdr *sshdr)
2598 sd_printk(KERN_INFO, sdkp, "");
2599 scsi_show_sense_hdr(sshdr);
2600 sd_printk(KERN_INFO, sdkp, "");
2601 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2604 static void sd_print_result(struct scsi_disk *sdkp, int result)
2606 sd_printk(KERN_INFO, sdkp, "");
2607 scsi_show_result(result);