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_app_tag_own(struct device *dev, struct device_attribute *attr,
265 struct scsi_disk *sdkp = to_scsi_disk(dev);
267 return snprintf(buf, 20, "%u\n", sdkp->ATO);
271 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
274 struct scsi_disk *sdkp = to_scsi_disk(dev);
276 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
279 static struct device_attribute sd_disk_attrs[] = {
280 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
281 sd_store_cache_type),
282 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
283 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
284 sd_store_allow_restart),
285 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
286 sd_store_manage_start_stop),
287 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
288 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
289 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
293 static struct class sd_disk_class = {
295 .owner = THIS_MODULE,
296 .dev_release = scsi_disk_release,
297 .dev_attrs = sd_disk_attrs,
300 static struct scsi_driver sd_template = {
301 .owner = THIS_MODULE,
306 .suspend = sd_suspend,
308 .shutdown = sd_shutdown,
315 * Device no to disk mapping:
317 * major disc2 disc p1
318 * |............|.............|....|....| <- dev_t
321 * Inside a major, we have 16k disks, however mapped non-
322 * contiguously. The first 16 disks are for major0, the next
323 * ones with major1, ... Disk 256 is for major0 again, disk 272
325 * As we stay compatible with our numbering scheme, we can reuse
326 * the well-know SCSI majors 8, 65--71, 136--143.
328 static int sd_major(int major_idx)
332 return SCSI_DISK0_MAJOR;
334 return SCSI_DISK1_MAJOR + major_idx - 1;
336 return SCSI_DISK8_MAJOR + major_idx - 8;
339 return 0; /* shut up gcc */
343 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
345 struct scsi_disk *sdkp = NULL;
347 if (disk->private_data) {
348 sdkp = scsi_disk(disk);
349 if (scsi_device_get(sdkp->device) == 0)
350 get_device(&sdkp->dev);
357 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
359 struct scsi_disk *sdkp;
361 mutex_lock(&sd_ref_mutex);
362 sdkp = __scsi_disk_get(disk);
363 mutex_unlock(&sd_ref_mutex);
367 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
369 struct scsi_disk *sdkp;
371 mutex_lock(&sd_ref_mutex);
372 sdkp = dev_get_drvdata(dev);
374 sdkp = __scsi_disk_get(sdkp->disk);
375 mutex_unlock(&sd_ref_mutex);
379 static void scsi_disk_put(struct scsi_disk *sdkp)
381 struct scsi_device *sdev = sdkp->device;
383 mutex_lock(&sd_ref_mutex);
384 put_device(&sdkp->dev);
385 scsi_device_put(sdev);
386 mutex_unlock(&sd_ref_mutex);
389 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
391 unsigned int prot_op = SCSI_PROT_NORMAL;
392 unsigned int dix = scsi_prot_sg_count(scmd);
394 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
396 prot_op = SCSI_PROT_READ_PASS;
397 else if (dif && !dix)
398 prot_op = SCSI_PROT_READ_STRIP;
399 else if (!dif && dix)
400 prot_op = SCSI_PROT_READ_INSERT;
403 prot_op = SCSI_PROT_WRITE_PASS;
404 else if (dif && !dix)
405 prot_op = SCSI_PROT_WRITE_INSERT;
406 else if (!dif && dix)
407 prot_op = SCSI_PROT_WRITE_STRIP;
410 scsi_set_prot_op(scmd, prot_op);
411 scsi_set_prot_type(scmd, dif);
415 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
416 * @sdp: scsi device to operate one
417 * @rq: Request to prepare
419 * Will issue either UNMAP or WRITE SAME(16) depending on preference
420 * indicated by target device.
422 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
424 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
425 struct bio *bio = rq->bio;
426 sector_t sector = bio->bi_sector;
427 unsigned int nr_sectors = bio_sectors(bio);
432 if (sdkp->device->sector_size == 4096) {
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);
471 if (ret != BLKPREP_OK) {
478 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
480 rq->timeout = SD_FLUSH_TIMEOUT;
481 rq->retries = SD_MAX_RETRIES;
482 rq->cmd[0] = SYNCHRONIZE_CACHE;
485 return scsi_setup_blk_pc_cmnd(sdp, rq);
488 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
490 if (rq->cmd_flags & REQ_DISCARD) {
491 free_page((unsigned long)rq->buffer);
497 * sd_init_command - build a scsi (read or write) command from
498 * information in the request structure.
499 * @SCpnt: pointer to mid-level's per scsi command structure that
500 * contains request and into which the scsi command is written
502 * Returns 1 if successful and 0 if error (or cannot be done now).
504 static int sd_prep_fn(struct request_queue *q, struct request *rq)
506 struct scsi_cmnd *SCpnt;
507 struct scsi_device *sdp = q->queuedata;
508 struct gendisk *disk = rq->rq_disk;
509 struct scsi_disk *sdkp;
510 sector_t block = blk_rq_pos(rq);
512 unsigned int this_count = blk_rq_sectors(rq);
514 unsigned char protect;
517 * Discard request come in as REQ_TYPE_FS but we turn them into
518 * block PC requests to make life easier.
520 if (rq->cmd_flags & REQ_DISCARD) {
521 ret = scsi_setup_discard_cmnd(sdp, rq);
523 } else if (rq->cmd_flags & REQ_FLUSH) {
524 ret = scsi_setup_flush_cmnd(sdp, rq);
526 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
527 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
529 } else if (rq->cmd_type != REQ_TYPE_FS) {
533 ret = scsi_setup_fs_cmnd(sdp, rq);
534 if (ret != BLKPREP_OK)
537 sdkp = scsi_disk(disk);
539 /* from here on until we're complete, any goto out
540 * is used for a killable error condition */
543 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
544 "sd_init_command: block=%llu, "
546 (unsigned long long)block,
549 if (!sdp || !scsi_device_online(sdp) ||
550 block + blk_rq_sectors(rq) > get_capacity(disk)) {
551 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
552 "Finishing %u sectors\n",
553 blk_rq_sectors(rq)));
554 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
555 "Retry with 0x%p\n", SCpnt));
561 * quietly refuse to do anything to a changed disc until
562 * the changed bit has been reset
564 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
569 * Some SD card readers can't handle multi-sector accesses which touch
570 * the last one or two hardware sectors. Split accesses as needed.
572 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
573 (sdp->sector_size / 512);
575 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
576 if (block < threshold) {
577 /* Access up to the threshold but not beyond */
578 this_count = threshold - block;
580 /* Access only a single hardware sector */
581 this_count = sdp->sector_size / 512;
585 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
586 (unsigned long long)block));
589 * If we have a 1K hardware sectorsize, prevent access to single
590 * 512 byte sectors. In theory we could handle this - in fact
591 * the scsi cdrom driver must be able to handle this because
592 * we typically use 1K blocksizes, and cdroms typically have
593 * 2K hardware sectorsizes. Of course, things are simpler
594 * with the cdrom, since it is read-only. For performance
595 * reasons, the filesystems should be able to handle this
596 * and not force the scsi disk driver to use bounce buffers
599 if (sdp->sector_size == 1024) {
600 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
601 scmd_printk(KERN_ERR, SCpnt,
602 "Bad block number requested\n");
606 this_count = this_count >> 1;
609 if (sdp->sector_size == 2048) {
610 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
611 scmd_printk(KERN_ERR, SCpnt,
612 "Bad block number requested\n");
616 this_count = this_count >> 2;
619 if (sdp->sector_size == 4096) {
620 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
621 scmd_printk(KERN_ERR, SCpnt,
622 "Bad block number requested\n");
626 this_count = this_count >> 3;
629 if (rq_data_dir(rq) == WRITE) {
630 if (!sdp->writeable) {
633 SCpnt->cmnd[0] = WRITE_6;
634 SCpnt->sc_data_direction = DMA_TO_DEVICE;
636 if (blk_integrity_rq(rq) &&
637 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
640 } else if (rq_data_dir(rq) == READ) {
641 SCpnt->cmnd[0] = READ_6;
642 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
644 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
648 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
649 "%s %d/%u 512 byte blocks.\n",
650 (rq_data_dir(rq) == WRITE) ?
651 "writing" : "reading", this_count,
652 blk_rq_sectors(rq)));
654 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
655 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
661 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
662 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
664 if (unlikely(SCpnt->cmnd == NULL)) {
669 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
670 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
671 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
672 SCpnt->cmnd[7] = 0x18;
673 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
674 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
677 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
678 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
679 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
680 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
681 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
682 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
683 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
684 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
686 /* Expected Indirect LBA */
687 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
688 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
689 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
690 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
692 /* Transfer length */
693 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
694 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
695 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
696 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
697 } else if (block > 0xffffffff) {
698 SCpnt->cmnd[0] += READ_16 - READ_6;
699 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
700 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
701 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
702 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
703 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
704 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
705 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
706 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
707 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
708 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
709 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
710 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
711 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
712 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
713 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
714 scsi_device_protection(SCpnt->device) ||
715 SCpnt->device->use_10_for_rw) {
716 if (this_count > 0xffff)
719 SCpnt->cmnd[0] += READ_10 - READ_6;
720 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
721 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
722 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
723 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
724 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
725 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
726 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
727 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
729 if (unlikely(rq->cmd_flags & REQ_FUA)) {
731 * This happens only if this drive failed
732 * 10byte rw command with ILLEGAL_REQUEST
733 * during operation and thus turned off
736 scmd_printk(KERN_ERR, SCpnt,
737 "FUA write on READ/WRITE(6) drive\n");
741 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
742 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
743 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
744 SCpnt->cmnd[4] = (unsigned char) this_count;
747 SCpnt->sdb.length = this_count * sdp->sector_size;
749 /* If DIF or DIX is enabled, tell HBA how to handle request */
750 if (host_dif || scsi_prot_sg_count(SCpnt))
751 sd_prot_op(SCpnt, host_dif);
754 * We shouldn't disconnect in the middle of a sector, so with a dumb
755 * host adapter, it's safe to assume that we can at least transfer
756 * this many bytes between each connect / disconnect.
758 SCpnt->transfersize = sdp->sector_size;
759 SCpnt->underflow = this_count << 9;
760 SCpnt->allowed = SD_MAX_RETRIES;
763 * This indicates that the command is ready from our end to be
768 return scsi_prep_return(q, rq, ret);
772 * sd_open - open a scsi disk device
773 * @inode: only i_rdev member may be used
774 * @filp: only f_mode and f_flags may be used
776 * Returns 0 if successful. Returns a negated errno value in case
779 * Note: This can be called from a user context (e.g. fsck(1) )
780 * or from within the kernel (e.g. as a result of a mount(1) ).
781 * In the latter case @inode and @filp carry an abridged amount
782 * of information as noted above.
784 * Locking: called with bdev->bd_mutex held.
786 static int sd_open(struct block_device *bdev, fmode_t mode)
788 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
789 struct scsi_device *sdev;
795 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
799 retval = scsi_autopm_get_device(sdev);
804 * If the device is in error recovery, wait until it is done.
805 * If the device is offline, then disallow any access to it.
808 if (!scsi_block_when_processing_errors(sdev))
811 if (sdev->removable || sdkp->write_prot)
812 check_disk_change(bdev);
815 * If the drive is empty, just let the open fail.
818 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
822 * If the device has the write protect tab set, have the open fail
823 * if the user expects to be able to write to the thing.
826 if (sdkp->write_prot && (mode & FMODE_WRITE))
830 * It is possible that the disk changing stuff resulted in
831 * the device being taken offline. If this is the case,
832 * report this to the user, and don't pretend that the
833 * open actually succeeded.
836 if (!scsi_device_online(sdev))
839 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
840 if (scsi_block_when_processing_errors(sdev))
841 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
847 scsi_autopm_put_device(sdev);
854 * sd_release - invoked when the (last) close(2) is called on this
856 * @inode: only i_rdev member may be used
857 * @filp: only f_mode and f_flags may be used
861 * Note: may block (uninterruptible) if error recovery is underway
864 * Locking: called with bdev->bd_mutex held.
866 static int sd_release(struct gendisk *disk, fmode_t mode)
868 struct scsi_disk *sdkp = scsi_disk(disk);
869 struct scsi_device *sdev = sdkp->device;
871 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
873 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
874 if (scsi_block_when_processing_errors(sdev))
875 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
879 * XXX and what if there are packets in flight and this close()
880 * XXX is followed by a "rmmod sd_mod"?
883 scsi_autopm_put_device(sdev);
888 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
890 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
891 struct scsi_device *sdp = sdkp->device;
892 struct Scsi_Host *host = sdp->host;
895 /* default to most commonly used values */
896 diskinfo[0] = 0x40; /* 1 << 6 */
897 diskinfo[1] = 0x20; /* 1 << 5 */
898 diskinfo[2] = sdkp->capacity >> 11;
900 /* override with calculated, extended default, or driver values */
901 if (host->hostt->bios_param)
902 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
904 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
906 geo->heads = diskinfo[0];
907 geo->sectors = diskinfo[1];
908 geo->cylinders = diskinfo[2];
913 * sd_ioctl - process an ioctl
914 * @inode: only i_rdev/i_bdev members may be used
915 * @filp: only f_mode and f_flags may be used
916 * @cmd: ioctl command number
917 * @arg: this is third argument given to ioctl(2) system call.
918 * Often contains a pointer.
920 * Returns 0 if successful (some ioctls return postive numbers on
921 * success as well). Returns a negated errno value in case of error.
923 * Note: most ioctls are forward onto the block subsystem or further
924 * down in the scsi subsystem.
926 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
927 unsigned int cmd, unsigned long arg)
929 struct gendisk *disk = bdev->bd_disk;
930 struct scsi_device *sdp = scsi_disk(disk)->device;
931 void __user *p = (void __user *)arg;
934 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
935 disk->disk_name, cmd));
938 * If we are in the middle of error recovery, don't let anyone
939 * else try and use this device. Also, if error recovery fails, it
940 * may try and take the device offline, in which case all further
941 * access to the device is prohibited.
943 error = scsi_nonblockable_ioctl(sdp, cmd, p,
944 (mode & FMODE_NDELAY) != 0);
945 if (!scsi_block_when_processing_errors(sdp) || !error)
949 * Send SCSI addressing ioctls directly to mid level, send other
950 * ioctls to block level and then onto mid level if they can't be
954 case SCSI_IOCTL_GET_IDLUN:
955 case SCSI_IOCTL_GET_BUS_NUMBER:
956 error = scsi_ioctl(sdp, cmd, p);
959 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
960 if (error != -ENOTTY)
962 error = scsi_ioctl(sdp, cmd, p);
969 static void set_media_not_present(struct scsi_disk *sdkp)
971 sdkp->media_present = 0;
973 sdkp->device->changed = 1;
977 * sd_media_changed - check if our medium changed
978 * @disk: kernel device descriptor
980 * Returns 0 if not applicable or no change; 1 if change
982 * Note: this function is invoked from the block subsystem.
984 static int sd_media_changed(struct gendisk *disk)
986 struct scsi_disk *sdkp = scsi_disk(disk);
987 struct scsi_device *sdp = sdkp->device;
988 struct scsi_sense_hdr *sshdr = NULL;
991 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
997 * If the device is offline, don't send any commands - just pretend as
998 * if the command failed. If the device ever comes back online, we
999 * can deal with it then. It is only because of unrecoverable errors
1000 * that we would ever take a device offline in the first place.
1002 if (!scsi_device_online(sdp)) {
1003 set_media_not_present(sdkp);
1009 * Using TEST_UNIT_READY enables differentiation between drive with
1010 * no cartridge loaded - NOT READY, drive with changed cartridge -
1011 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1013 * Drives that auto spin down. eg iomega jaz 1G, will be started
1014 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1015 * sd_revalidate() is called.
1019 if (scsi_block_when_processing_errors(sdp)) {
1020 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1021 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1026 * Unable to test, unit probably not ready. This usually
1027 * means there is no disc in the drive. Mark as changed,
1028 * and we will figure it out later once the drive is
1031 if (retval || (scsi_sense_valid(sshdr) &&
1032 /* 0x3a is medium not present */
1033 sshdr->asc == 0x3a)) {
1034 set_media_not_present(sdkp);
1040 * For removable scsi disk we have to recognise the presence
1041 * of a disk in the drive. This is kept in the struct scsi_disk
1042 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1044 sdkp->media_present = 1;
1046 retval = sdp->changed;
1049 if (retval != sdkp->previous_state)
1050 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1051 sdkp->previous_state = retval;
1056 static int sd_sync_cache(struct scsi_disk *sdkp)
1059 struct scsi_device *sdp = sdkp->device;
1060 struct scsi_sense_hdr sshdr;
1062 if (!scsi_device_online(sdp))
1066 for (retries = 3; retries > 0; --retries) {
1067 unsigned char cmd[10] = { 0 };
1069 cmd[0] = SYNCHRONIZE_CACHE;
1071 * Leave the rest of the command zero to indicate
1074 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1075 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1081 sd_print_result(sdkp, res);
1082 if (driver_byte(res) & DRIVER_SENSE)
1083 sd_print_sense_hdr(sdkp, &sshdr);
1091 static void sd_rescan(struct device *dev)
1093 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1096 revalidate_disk(sdkp->disk);
1097 scsi_disk_put(sdkp);
1102 #ifdef CONFIG_COMPAT
1104 * This gets directly called from VFS. When the ioctl
1105 * is not recognized we go back to the other translation paths.
1107 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1108 unsigned int cmd, unsigned long arg)
1110 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1113 * If we are in the middle of error recovery, don't let anyone
1114 * else try and use this device. Also, if error recovery fails, it
1115 * may try and take the device offline, in which case all further
1116 * access to the device is prohibited.
1118 if (!scsi_block_when_processing_errors(sdev))
1121 if (sdev->host->hostt->compat_ioctl) {
1124 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1130 * Let the static ioctl translation table take care of it.
1132 return -ENOIOCTLCMD;
1136 static const struct block_device_operations sd_fops = {
1137 .owner = THIS_MODULE,
1139 .release = sd_release,
1141 .getgeo = sd_getgeo,
1142 #ifdef CONFIG_COMPAT
1143 .compat_ioctl = sd_compat_ioctl,
1145 .media_changed = sd_media_changed,
1146 .revalidate_disk = sd_revalidate_disk,
1147 .unlock_native_capacity = sd_unlock_native_capacity,
1150 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1152 u64 start_lba = blk_rq_pos(scmd->request);
1153 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1157 if (scmd->request->cmd_type != REQ_TYPE_FS)
1160 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1161 SCSI_SENSE_BUFFERSIZE,
1166 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1169 if (scmd->device->sector_size < 512) {
1170 /* only legitimate sector_size here is 256 */
1174 /* be careful ... don't want any overflows */
1175 u64 factor = scmd->device->sector_size / 512;
1176 do_div(start_lba, factor);
1177 do_div(end_lba, factor);
1180 /* The bad lba was reported incorrectly, we have no idea where
1183 if (bad_lba < start_lba || bad_lba >= end_lba)
1186 /* This computation should always be done in terms of
1187 * the resolution of the device's medium.
1189 return (bad_lba - start_lba) * scmd->device->sector_size;
1193 * sd_done - bottom half handler: called when the lower level
1194 * driver has completed (successfully or otherwise) a scsi command.
1195 * @SCpnt: mid-level's per command structure.
1197 * Note: potentially run from within an ISR. Must not block.
1199 static int sd_done(struct scsi_cmnd *SCpnt)
1201 int result = SCpnt->result;
1202 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1203 struct scsi_sense_hdr sshdr;
1204 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1205 int sense_valid = 0;
1206 int sense_deferred = 0;
1208 if (SCpnt->request->cmd_flags & REQ_DISCARD) {
1210 scsi_set_resid(SCpnt, 0);
1215 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1217 sense_deferred = scsi_sense_is_deferred(&sshdr);
1219 #ifdef CONFIG_SCSI_LOGGING
1220 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1222 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1223 "sd_done: sb[respc,sk,asc,"
1224 "ascq]=%x,%x,%x,%x\n",
1225 sshdr.response_code,
1226 sshdr.sense_key, sshdr.asc,
1230 if (driver_byte(result) != DRIVER_SENSE &&
1231 (!sense_valid || sense_deferred))
1234 switch (sshdr.sense_key) {
1235 case HARDWARE_ERROR:
1237 good_bytes = sd_completed_bytes(SCpnt);
1239 case RECOVERED_ERROR:
1240 good_bytes = scsi_bufflen(SCpnt);
1243 /* This indicates a false check condition, so ignore it. An
1244 * unknown amount of data was transferred so treat it as an
1247 scsi_print_sense("sd", SCpnt);
1249 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1251 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1252 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1253 if (sshdr.asc == 0x10)
1254 good_bytes = sd_completed_bytes(SCpnt);
1260 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1261 sd_dif_complete(SCpnt, good_bytes);
1263 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1264 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1266 /* We have to print a failed command here as the
1267 * extended CDB gets freed before scsi_io_completion()
1271 scsi_print_command(SCpnt);
1273 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1281 static int media_not_present(struct scsi_disk *sdkp,
1282 struct scsi_sense_hdr *sshdr)
1285 if (!scsi_sense_valid(sshdr))
1287 /* not invoked for commands that could return deferred errors */
1288 if (sshdr->sense_key != NOT_READY &&
1289 sshdr->sense_key != UNIT_ATTENTION)
1291 if (sshdr->asc != 0x3A) /* medium not present */
1294 set_media_not_present(sdkp);
1299 * spinup disk - called only in sd_revalidate_disk()
1302 sd_spinup_disk(struct scsi_disk *sdkp)
1304 unsigned char cmd[10];
1305 unsigned long spintime_expire = 0;
1306 int retries, spintime;
1307 unsigned int the_result;
1308 struct scsi_sense_hdr sshdr;
1309 int sense_valid = 0;
1313 /* Spin up drives, as required. Only do this at boot time */
1314 /* Spinup needs to be done for module loads too. */
1319 cmd[0] = TEST_UNIT_READY;
1320 memset((void *) &cmd[1], 0, 9);
1322 the_result = scsi_execute_req(sdkp->device, cmd,
1325 SD_MAX_RETRIES, NULL);
1328 * If the drive has indicated to us that it
1329 * doesn't have any media in it, don't bother
1330 * with any more polling.
1332 if (media_not_present(sdkp, &sshdr))
1336 sense_valid = scsi_sense_valid(&sshdr);
1338 } while (retries < 3 &&
1339 (!scsi_status_is_good(the_result) ||
1340 ((driver_byte(the_result) & DRIVER_SENSE) &&
1341 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1343 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1344 /* no sense, TUR either succeeded or failed
1345 * with a status error */
1346 if(!spintime && !scsi_status_is_good(the_result)) {
1347 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1348 sd_print_result(sdkp, the_result);
1354 * The device does not want the automatic start to be issued.
1356 if (sdkp->device->no_start_on_add)
1359 if (sense_valid && sshdr.sense_key == NOT_READY) {
1360 if (sshdr.asc == 4 && sshdr.ascq == 3)
1361 break; /* manual intervention required */
1362 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1363 break; /* standby */
1364 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1365 break; /* unavailable */
1367 * Issue command to spin up drive when not ready
1370 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1371 cmd[0] = START_STOP;
1372 cmd[1] = 1; /* Return immediately */
1373 memset((void *) &cmd[2], 0, 8);
1374 cmd[4] = 1; /* Start spin cycle */
1375 if (sdkp->device->start_stop_pwr_cond)
1377 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1379 SD_TIMEOUT, SD_MAX_RETRIES,
1381 spintime_expire = jiffies + 100 * HZ;
1384 /* Wait 1 second for next try */
1389 * Wait for USB flash devices with slow firmware.
1390 * Yes, this sense key/ASC combination shouldn't
1391 * occur here. It's characteristic of these devices.
1393 } else if (sense_valid &&
1394 sshdr.sense_key == UNIT_ATTENTION &&
1395 sshdr.asc == 0x28) {
1397 spintime_expire = jiffies + 5 * HZ;
1400 /* Wait 1 second for next try */
1403 /* we don't understand the sense code, so it's
1404 * probably pointless to loop */
1406 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1407 sd_print_sense_hdr(sdkp, &sshdr);
1412 } while (spintime && time_before_eq(jiffies, spintime_expire));
1415 if (scsi_status_is_good(the_result))
1418 printk("not responding...\n");
1424 * Determine whether disk supports Data Integrity Field.
1426 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1428 struct scsi_device *sdp = sdkp->device;
1431 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1434 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1436 if (type == sdkp->protection_type || !sdkp->first_scan)
1439 sdkp->protection_type = type;
1441 if (type > SD_DIF_TYPE3_PROTECTION) {
1442 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1443 "protection type %u. Disabling disk!\n", type);
1448 if (scsi_host_dif_capable(sdp->host, type))
1449 sd_printk(KERN_NOTICE, sdkp,
1450 "Enabling DIF Type %u protection\n", type);
1452 sd_printk(KERN_NOTICE, sdkp,
1453 "Disabling DIF Type %u protection\n", type);
1456 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1457 struct scsi_sense_hdr *sshdr, int sense_valid,
1460 sd_print_result(sdkp, the_result);
1461 if (driver_byte(the_result) & DRIVER_SENSE)
1462 sd_print_sense_hdr(sdkp, sshdr);
1464 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1467 * Set dirty bit for removable devices if not ready -
1468 * sometimes drives will not report this properly.
1470 if (sdp->removable &&
1471 sense_valid && sshdr->sense_key == NOT_READY)
1475 * We used to set media_present to 0 here to indicate no media
1476 * in the drive, but some drives fail read capacity even with
1477 * media present, so we can't do that.
1479 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1483 #if RC16_LEN > SD_BUF_SIZE
1484 #error RC16_LEN must not be more than SD_BUF_SIZE
1487 #define READ_CAPACITY_RETRIES_ON_RESET 10
1489 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1490 unsigned char *buffer)
1492 unsigned char cmd[16];
1493 struct scsi_sense_hdr sshdr;
1494 int sense_valid = 0;
1496 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1497 unsigned int alignment;
1498 unsigned long long lba;
1499 unsigned sector_size;
1503 cmd[0] = SERVICE_ACTION_IN;
1504 cmd[1] = SAI_READ_CAPACITY_16;
1506 memset(buffer, 0, RC16_LEN);
1508 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1509 buffer, RC16_LEN, &sshdr,
1510 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1512 if (media_not_present(sdkp, &sshdr))
1516 sense_valid = scsi_sense_valid(&sshdr);
1518 sshdr.sense_key == ILLEGAL_REQUEST &&
1519 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1521 /* Invalid Command Operation Code or
1522 * Invalid Field in CDB, just retry
1523 * silently with RC10 */
1526 sshdr.sense_key == UNIT_ATTENTION &&
1527 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1528 /* Device reset might occur several times,
1529 * give it one more chance */
1530 if (--reset_retries > 0)
1535 } while (the_result && retries);
1538 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1539 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1543 sector_size = get_unaligned_be32(&buffer[8]);
1544 lba = get_unaligned_be64(&buffer[0]);
1546 sd_read_protection_type(sdkp, buffer);
1548 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1549 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1550 "kernel compiled with support for large block "
1556 /* Logical blocks per physical block exponent */
1557 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1559 /* Lowest aligned logical block */
1560 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1561 blk_queue_alignment_offset(sdp->request_queue, alignment);
1562 if (alignment && sdkp->first_scan)
1563 sd_printk(KERN_NOTICE, sdkp,
1564 "physical block alignment offset: %u\n", alignment);
1566 if (buffer[14] & 0x80) { /* TPE */
1567 struct request_queue *q = sdp->request_queue;
1569 sdkp->thin_provisioning = 1;
1570 q->limits.discard_granularity = sdkp->physical_block_size;
1571 q->limits.max_discard_sectors = 0xffffffff;
1573 if (buffer[14] & 0x40) /* TPRZ */
1574 q->limits.discard_zeroes_data = 1;
1576 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1579 sdkp->capacity = lba + 1;
1583 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1584 unsigned char *buffer)
1586 unsigned char cmd[16];
1587 struct scsi_sense_hdr sshdr;
1588 int sense_valid = 0;
1590 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1592 unsigned sector_size;
1595 cmd[0] = READ_CAPACITY;
1596 memset(&cmd[1], 0, 9);
1597 memset(buffer, 0, 8);
1599 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1601 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1603 if (media_not_present(sdkp, &sshdr))
1607 sense_valid = scsi_sense_valid(&sshdr);
1609 sshdr.sense_key == UNIT_ATTENTION &&
1610 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1611 /* Device reset might occur several times,
1612 * give it one more chance */
1613 if (--reset_retries > 0)
1618 } while (the_result && retries);
1621 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1622 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1626 sector_size = get_unaligned_be32(&buffer[4]);
1627 lba = get_unaligned_be32(&buffer[0]);
1629 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1630 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1631 "kernel compiled with support for large block "
1637 sdkp->capacity = lba + 1;
1638 sdkp->physical_block_size = sector_size;
1642 static int sd_try_rc16_first(struct scsi_device *sdp)
1644 if (sdp->host->max_cmd_len < 16)
1646 if (sdp->scsi_level > SCSI_SPC_2)
1648 if (scsi_device_protection(sdp))
1654 * read disk capacity
1657 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1660 struct scsi_device *sdp = sdkp->device;
1661 sector_t old_capacity = sdkp->capacity;
1663 if (sd_try_rc16_first(sdp)) {
1664 sector_size = read_capacity_16(sdkp, sdp, buffer);
1665 if (sector_size == -EOVERFLOW)
1667 if (sector_size == -ENODEV)
1669 if (sector_size < 0)
1670 sector_size = read_capacity_10(sdkp, sdp, buffer);
1671 if (sector_size < 0)
1674 sector_size = read_capacity_10(sdkp, sdp, buffer);
1675 if (sector_size == -EOVERFLOW)
1677 if (sector_size < 0)
1679 if ((sizeof(sdkp->capacity) > 4) &&
1680 (sdkp->capacity > 0xffffffffULL)) {
1681 int old_sector_size = sector_size;
1682 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1683 "Trying to use READ CAPACITY(16).\n");
1684 sector_size = read_capacity_16(sdkp, sdp, buffer);
1685 if (sector_size < 0) {
1686 sd_printk(KERN_NOTICE, sdkp,
1687 "Using 0xffffffff as device size\n");
1688 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1689 sector_size = old_sector_size;
1695 /* Some devices are known to return the total number of blocks,
1696 * not the highest block number. Some devices have versions
1697 * which do this and others which do not. Some devices we might
1698 * suspect of doing this but we don't know for certain.
1700 * If we know the reported capacity is wrong, decrement it. If
1701 * we can only guess, then assume the number of blocks is even
1702 * (usually true but not always) and err on the side of lowering
1705 if (sdp->fix_capacity ||
1706 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1707 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1708 "from its reported value: %llu\n",
1709 (unsigned long long) sdkp->capacity);
1714 if (sector_size == 0) {
1716 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1720 if (sector_size != 512 &&
1721 sector_size != 1024 &&
1722 sector_size != 2048 &&
1723 sector_size != 4096 &&
1724 sector_size != 256) {
1725 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1728 * The user might want to re-format the drive with
1729 * a supported sectorsize. Once this happens, it
1730 * would be relatively trivial to set the thing up.
1731 * For this reason, we leave the thing in the table.
1735 * set a bogus sector size so the normal read/write
1736 * logic in the block layer will eventually refuse any
1737 * request on this device without tripping over power
1738 * of two sector size assumptions
1742 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1745 char cap_str_2[10], cap_str_10[10];
1746 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1748 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1750 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1751 sizeof(cap_str_10));
1753 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1754 sd_printk(KERN_NOTICE, sdkp,
1755 "%llu %d-byte logical blocks: (%s/%s)\n",
1756 (unsigned long long)sdkp->capacity,
1757 sector_size, cap_str_10, cap_str_2);
1759 if (sdkp->physical_block_size != sector_size)
1760 sd_printk(KERN_NOTICE, sdkp,
1761 "%u-byte physical blocks\n",
1762 sdkp->physical_block_size);
1766 /* Rescale capacity to 512-byte units */
1767 if (sector_size == 4096)
1768 sdkp->capacity <<= 3;
1769 else if (sector_size == 2048)
1770 sdkp->capacity <<= 2;
1771 else if (sector_size == 1024)
1772 sdkp->capacity <<= 1;
1773 else if (sector_size == 256)
1774 sdkp->capacity >>= 1;
1776 blk_queue_physical_block_size(sdp->request_queue,
1777 sdkp->physical_block_size);
1778 sdkp->device->sector_size = sector_size;
1781 /* called with buffer of length 512 */
1783 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1784 unsigned char *buffer, int len, struct scsi_mode_data *data,
1785 struct scsi_sense_hdr *sshdr)
1787 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1788 SD_TIMEOUT, SD_MAX_RETRIES, data,
1793 * read write protect setting, if possible - called only in sd_revalidate_disk()
1794 * called with buffer of length SD_BUF_SIZE
1797 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1800 struct scsi_device *sdp = sdkp->device;
1801 struct scsi_mode_data data;
1802 int old_wp = sdkp->write_prot;
1804 set_disk_ro(sdkp->disk, 0);
1805 if (sdp->skip_ms_page_3f) {
1806 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1810 if (sdp->use_192_bytes_for_3f) {
1811 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1814 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1815 * We have to start carefully: some devices hang if we ask
1816 * for more than is available.
1818 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1821 * Second attempt: ask for page 0 When only page 0 is
1822 * implemented, a request for page 3F may return Sense Key
1823 * 5: Illegal Request, Sense Code 24: Invalid field in
1826 if (!scsi_status_is_good(res))
1827 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1830 * Third attempt: ask 255 bytes, as we did earlier.
1832 if (!scsi_status_is_good(res))
1833 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1837 if (!scsi_status_is_good(res)) {
1838 sd_printk(KERN_WARNING, sdkp,
1839 "Test WP failed, assume Write Enabled\n");
1841 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1842 set_disk_ro(sdkp->disk, sdkp->write_prot);
1843 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1844 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1845 sdkp->write_prot ? "on" : "off");
1846 sd_printk(KERN_DEBUG, sdkp,
1847 "Mode Sense: %02x %02x %02x %02x\n",
1848 buffer[0], buffer[1], buffer[2], buffer[3]);
1854 * sd_read_cache_type - called only from sd_revalidate_disk()
1855 * called with buffer of length SD_BUF_SIZE
1858 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1861 struct scsi_device *sdp = sdkp->device;
1865 struct scsi_mode_data data;
1866 struct scsi_sense_hdr sshdr;
1867 int old_wce = sdkp->WCE;
1868 int old_rcd = sdkp->RCD;
1869 int old_dpofua = sdkp->DPOFUA;
1871 if (sdp->skip_ms_page_8)
1874 if (sdp->type == TYPE_RBC) {
1882 /* cautiously ask */
1883 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1885 if (!scsi_status_is_good(res))
1888 if (!data.header_length) {
1890 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1893 /* that went OK, now ask for the proper length */
1897 * We're only interested in the first three bytes, actually.
1898 * But the data cache page is defined for the first 20.
1905 /* Take headers and block descriptors into account */
1906 len += data.header_length + data.block_descriptor_length;
1907 if (len > SD_BUF_SIZE)
1911 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1913 if (scsi_status_is_good(res)) {
1914 int offset = data.header_length + data.block_descriptor_length;
1916 if (offset >= SD_BUF_SIZE - 2) {
1917 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1921 if ((buffer[offset] & 0x3f) != modepage) {
1922 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1926 if (modepage == 8) {
1927 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1928 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1930 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1934 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1935 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1936 sd_printk(KERN_NOTICE, sdkp,
1937 "Uses READ/WRITE(6), disabling FUA\n");
1941 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1942 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1943 sd_printk(KERN_NOTICE, sdkp,
1944 "Write cache: %s, read cache: %s, %s\n",
1945 sdkp->WCE ? "enabled" : "disabled",
1946 sdkp->RCD ? "disabled" : "enabled",
1947 sdkp->DPOFUA ? "supports DPO and FUA"
1948 : "doesn't support DPO or FUA");
1954 if (scsi_sense_valid(&sshdr) &&
1955 sshdr.sense_key == ILLEGAL_REQUEST &&
1956 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1957 /* Invalid field in CDB */
1958 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1960 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1963 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1970 * The ATO bit indicates whether the DIF application tag is available
1971 * for use by the operating system.
1973 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1976 struct scsi_device *sdp = sdkp->device;
1977 struct scsi_mode_data data;
1978 struct scsi_sense_hdr sshdr;
1980 if (sdp->type != TYPE_DISK)
1983 if (sdkp->protection_type == 0)
1986 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1987 SD_MAX_RETRIES, &data, &sshdr);
1989 if (!scsi_status_is_good(res) || !data.header_length ||
1991 sd_printk(KERN_WARNING, sdkp,
1992 "getting Control mode page failed, assume no ATO\n");
1994 if (scsi_sense_valid(&sshdr))
1995 sd_print_sense_hdr(sdkp, &sshdr);
2000 offset = data.header_length + data.block_descriptor_length;
2002 if ((buffer[offset] & 0x3f) != 0x0a) {
2003 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2007 if ((buffer[offset + 5] & 0x80) == 0)
2016 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2017 * @disk: disk to query
2019 static void sd_read_block_limits(struct scsi_disk *sdkp)
2021 struct request_queue *q = sdkp->disk->queue;
2022 unsigned int sector_sz = sdkp->device->sector_size;
2023 const int vpd_len = 64;
2024 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2027 /* Block Limits VPD */
2028 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2031 blk_queue_io_min(sdkp->disk->queue,
2032 get_unaligned_be16(&buffer[6]) * sector_sz);
2033 blk_queue_io_opt(sdkp->disk->queue,
2034 get_unaligned_be32(&buffer[12]) * sector_sz);
2036 /* Thin provisioning enabled and page length indicates TP support */
2037 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2038 unsigned int lba_count, desc_count, granularity;
2040 lba_count = get_unaligned_be32(&buffer[20]);
2041 desc_count = get_unaligned_be32(&buffer[24]);
2043 if (lba_count && desc_count) {
2044 if (sdkp->tpvpd && !sdkp->tpu)
2050 if (sdkp->tpvpd && !sdkp->tpu && !sdkp->tpws) {
2051 sd_printk(KERN_ERR, sdkp, "Thin provisioning is " \
2052 "enabled but neither TPU, nor TPWS are " \
2053 "set. Disabling discard!\n");
2058 q->limits.max_discard_sectors =
2059 lba_count * sector_sz >> 9;
2061 granularity = get_unaligned_be32(&buffer[28]);
2064 q->limits.discard_granularity = granularity * sector_sz;
2066 if (buffer[32] & 0x80)
2067 q->limits.discard_alignment =
2068 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2076 * sd_read_block_characteristics - Query block dev. characteristics
2077 * @disk: disk to query
2079 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2081 unsigned char *buffer;
2083 const int vpd_len = 64;
2085 buffer = kmalloc(vpd_len, GFP_KERNEL);
2088 /* Block Device Characteristics VPD */
2089 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2092 rot = get_unaligned_be16(&buffer[4]);
2095 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2102 * sd_read_thin_provisioning - Query thin provisioning VPD page
2103 * @disk: disk to query
2105 static void sd_read_thin_provisioning(struct scsi_disk *sdkp)
2107 unsigned char *buffer;
2108 const int vpd_len = 8;
2110 if (sdkp->thin_provisioning == 0)
2113 buffer = kmalloc(vpd_len, GFP_KERNEL);
2115 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2119 sdkp->tpu = (buffer[5] >> 7) & 1; /* UNMAP */
2120 sdkp->tpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2126 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2129 * Although VPD inquiries can go to SCSI-2 type devices,
2130 * some USB ones crash on receiving them, and the pages
2131 * we currently ask for are for SPC-3 and beyond
2133 if (sdp->scsi_level > SCSI_SPC_2)
2139 * sd_revalidate_disk - called the first time a new disk is seen,
2140 * performs disk spin up, read_capacity, etc.
2141 * @disk: struct gendisk we care about
2143 static int sd_revalidate_disk(struct gendisk *disk)
2145 struct scsi_disk *sdkp = scsi_disk(disk);
2146 struct scsi_device *sdp = sdkp->device;
2147 unsigned char *buffer;
2150 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2151 "sd_revalidate_disk\n"));
2154 * If the device is offline, don't try and read capacity or any
2155 * of the other niceties.
2157 if (!scsi_device_online(sdp))
2160 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2162 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2163 "allocation failure.\n");
2167 sd_spinup_disk(sdkp);
2170 * Without media there is no reason to ask; moreover, some devices
2171 * react badly if we do.
2173 if (sdkp->media_present) {
2174 sd_read_capacity(sdkp, buffer);
2176 if (sd_try_extended_inquiry(sdp)) {
2177 sd_read_thin_provisioning(sdkp);
2178 sd_read_block_limits(sdkp);
2179 sd_read_block_characteristics(sdkp);
2182 sd_read_write_protect_flag(sdkp, buffer);
2183 sd_read_cache_type(sdkp, buffer);
2184 sd_read_app_tag_own(sdkp, buffer);
2187 sdkp->first_scan = 0;
2190 * We now have all cache related info, determine how we deal
2191 * with flush requests.
2199 blk_queue_flush(sdkp->disk->queue, flush);
2201 set_capacity(disk, sdkp->capacity);
2209 * sd_unlock_native_capacity - unlock native capacity
2210 * @disk: struct gendisk to set capacity for
2212 * Block layer calls this function if it detects that partitions
2213 * on @disk reach beyond the end of the device. If the SCSI host
2214 * implements ->unlock_native_capacity() method, it's invoked to
2215 * give it a chance to adjust the device capacity.
2218 * Defined by block layer. Might sleep.
2220 static void sd_unlock_native_capacity(struct gendisk *disk)
2222 struct scsi_device *sdev = scsi_disk(disk)->device;
2224 if (sdev->host->hostt->unlock_native_capacity)
2225 sdev->host->hostt->unlock_native_capacity(sdev);
2229 * sd_format_disk_name - format disk name
2230 * @prefix: name prefix - ie. "sd" for SCSI disks
2231 * @index: index of the disk to format name for
2232 * @buf: output buffer
2233 * @buflen: length of the output buffer
2235 * SCSI disk names starts at sda. The 26th device is sdz and the
2236 * 27th is sdaa. The last one for two lettered suffix is sdzz
2237 * which is followed by sdaaa.
2239 * This is basically 26 base counting with one extra 'nil' entry
2240 * at the beginning from the second digit on and can be
2241 * determined using similar method as 26 base conversion with the
2242 * index shifted -1 after each digit is computed.
2248 * 0 on success, -errno on failure.
2250 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2252 const int base = 'z' - 'a' + 1;
2253 char *begin = buf + strlen(prefix);
2254 char *end = buf + buflen;
2264 *--p = 'a' + (index % unit);
2265 index = (index / unit) - 1;
2266 } while (index >= 0);
2268 memmove(begin, p, end - p);
2269 memcpy(buf, prefix, strlen(prefix));
2275 * The asynchronous part of sd_probe
2277 static void sd_probe_async(void *data, async_cookie_t cookie)
2279 struct scsi_disk *sdkp = data;
2280 struct scsi_device *sdp;
2287 index = sdkp->index;
2288 dev = &sdp->sdev_gendev;
2290 gd->major = sd_major((index & 0xf0) >> 4);
2291 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2292 gd->minors = SD_MINORS;
2294 gd->fops = &sd_fops;
2295 gd->private_data = &sdkp->driver;
2296 gd->queue = sdkp->device->request_queue;
2298 /* defaults, until the device tells us otherwise */
2299 sdp->sector_size = 512;
2301 sdkp->media_present = 1;
2302 sdkp->write_prot = 0;
2306 sdkp->first_scan = 1;
2308 sd_revalidate_disk(gd);
2310 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2311 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2313 gd->driverfs_dev = &sdp->sdev_gendev;
2314 gd->flags = GENHD_FL_EXT_DEVT;
2316 gd->flags |= GENHD_FL_REMOVABLE;
2319 sd_dif_config_host(sdkp);
2321 sd_revalidate_disk(gd);
2323 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2324 sdp->removable ? "removable " : "");
2325 scsi_autopm_put_device(sdp);
2326 put_device(&sdkp->dev);
2330 * sd_probe - called during driver initialization and whenever a
2331 * new scsi device is attached to the system. It is called once
2332 * for each scsi device (not just disks) present.
2333 * @dev: pointer to device object
2335 * Returns 0 if successful (or not interested in this scsi device
2336 * (e.g. scanner)); 1 when there is an error.
2338 * Note: this function is invoked from the scsi mid-level.
2339 * This function sets up the mapping between a given
2340 * <host,channel,id,lun> (found in sdp) and new device name
2341 * (e.g. /dev/sda). More precisely it is the block device major
2342 * and minor number that is chosen here.
2344 * Assume sd_attach is not re-entrant (for time being)
2345 * Also think about sd_attach() and sd_remove() running coincidentally.
2347 static int sd_probe(struct device *dev)
2349 struct scsi_device *sdp = to_scsi_device(dev);
2350 struct scsi_disk *sdkp;
2356 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2359 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2363 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2367 gd = alloc_disk(SD_MINORS);
2372 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2375 spin_lock(&sd_index_lock);
2376 error = ida_get_new(&sd_index_ida, &index);
2377 spin_unlock(&sd_index_lock);
2378 } while (error == -EAGAIN);
2383 if (index >= SD_MAX_DISKS) {
2385 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n");
2386 goto out_free_index;
2389 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2391 goto out_free_index;
2394 sdkp->driver = &sd_template;
2396 sdkp->index = index;
2397 atomic_set(&sdkp->openers, 0);
2398 sdkp->previous_state = 1;
2400 if (!sdp->request_queue->rq_timeout) {
2401 if (sdp->type != TYPE_MOD)
2402 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2404 blk_queue_rq_timeout(sdp->request_queue,
2408 device_initialize(&sdkp->dev);
2409 sdkp->dev.parent = dev;
2410 sdkp->dev.class = &sd_disk_class;
2411 dev_set_name(&sdkp->dev, dev_name(dev));
2413 if (device_add(&sdkp->dev))
2414 goto out_free_index;
2417 dev_set_drvdata(dev, sdkp);
2419 get_device(&sdkp->dev); /* prevent release before async_schedule */
2420 async_schedule(sd_probe_async, sdkp);
2425 spin_lock(&sd_index_lock);
2426 ida_remove(&sd_index_ida, index);
2427 spin_unlock(&sd_index_lock);
2437 * sd_remove - called whenever a scsi disk (previously recognized by
2438 * sd_probe) is detached from the system. It is called (potentially
2439 * multiple times) during sd module unload.
2440 * @sdp: pointer to mid level scsi device object
2442 * Note: this function is invoked from the scsi mid-level.
2443 * This function potentially frees up a device name (e.g. /dev/sdc)
2444 * that could be re-used by a subsequent sd_probe().
2445 * This function is not called when the built-in sd driver is "exit-ed".
2447 static int sd_remove(struct device *dev)
2449 struct scsi_disk *sdkp;
2451 sdkp = dev_get_drvdata(dev);
2452 scsi_autopm_get_device(sdkp->device);
2454 async_synchronize_full();
2455 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2456 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2457 device_del(&sdkp->dev);
2458 del_gendisk(sdkp->disk);
2461 mutex_lock(&sd_ref_mutex);
2462 dev_set_drvdata(dev, NULL);
2463 put_device(&sdkp->dev);
2464 mutex_unlock(&sd_ref_mutex);
2470 * scsi_disk_release - Called to free the scsi_disk structure
2471 * @dev: pointer to embedded class device
2473 * sd_ref_mutex must be held entering this routine. Because it is
2474 * called on last put, you should always use the scsi_disk_get()
2475 * scsi_disk_put() helpers which manipulate the semaphore directly
2476 * and never do a direct put_device.
2478 static void scsi_disk_release(struct device *dev)
2480 struct scsi_disk *sdkp = to_scsi_disk(dev);
2481 struct gendisk *disk = sdkp->disk;
2483 spin_lock(&sd_index_lock);
2484 ida_remove(&sd_index_ida, sdkp->index);
2485 spin_unlock(&sd_index_lock);
2487 disk->private_data = NULL;
2489 put_device(&sdkp->device->sdev_gendev);
2494 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2496 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2497 struct scsi_sense_hdr sshdr;
2498 struct scsi_device *sdp = sdkp->device;
2502 cmd[4] |= 1; /* START */
2504 if (sdp->start_stop_pwr_cond)
2505 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2507 if (!scsi_device_online(sdp))
2510 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2511 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2513 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2514 sd_print_result(sdkp, res);
2515 if (driver_byte(res) & DRIVER_SENSE)
2516 sd_print_sense_hdr(sdkp, &sshdr);
2523 * Send a SYNCHRONIZE CACHE instruction down to the device through
2524 * the normal SCSI command structure. Wait for the command to
2527 static void sd_shutdown(struct device *dev)
2529 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2532 return; /* this can happen */
2535 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2536 sd_sync_cache(sdkp);
2539 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2540 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2541 sd_start_stop_device(sdkp, 0);
2544 scsi_disk_put(sdkp);
2547 static int sd_suspend(struct device *dev, pm_message_t mesg)
2549 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2553 return 0; /* this can happen */
2556 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2557 ret = sd_sync_cache(sdkp);
2562 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2563 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2564 ret = sd_start_stop_device(sdkp, 0);
2568 scsi_disk_put(sdkp);
2572 static int sd_resume(struct device *dev)
2574 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2577 if (!sdkp->device->manage_start_stop)
2580 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2581 ret = sd_start_stop_device(sdkp, 1);
2584 scsi_disk_put(sdkp);
2589 * init_sd - entry point for this driver (both when built in or when
2592 * Note: this function registers this driver with the scsi mid-level.
2594 static int __init init_sd(void)
2596 int majors = 0, i, err;
2598 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2600 for (i = 0; i < SD_MAJORS; i++)
2601 if (register_blkdev(sd_major(i), "sd") == 0)
2607 err = class_register(&sd_disk_class);
2611 err = scsi_register_driver(&sd_template.gendrv);
2615 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2617 if (!sd_cdb_cache) {
2618 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2622 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2624 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2631 kmem_cache_destroy(sd_cdb_cache);
2634 class_unregister(&sd_disk_class);
2636 for (i = 0; i < SD_MAJORS; i++)
2637 unregister_blkdev(sd_major(i), "sd");
2642 * exit_sd - exit point for this driver (when it is a module).
2644 * Note: this function unregisters this driver from the scsi mid-level.
2646 static void __exit exit_sd(void)
2650 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2652 mempool_destroy(sd_cdb_pool);
2653 kmem_cache_destroy(sd_cdb_cache);
2655 scsi_unregister_driver(&sd_template.gendrv);
2656 class_unregister(&sd_disk_class);
2658 for (i = 0; i < SD_MAJORS; i++)
2659 unregister_blkdev(sd_major(i), "sd");
2662 module_init(init_sd);
2663 module_exit(exit_sd);
2665 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2666 struct scsi_sense_hdr *sshdr)
2668 sd_printk(KERN_INFO, sdkp, " ");
2669 scsi_show_sense_hdr(sshdr);
2670 sd_printk(KERN_INFO, sdkp, " ");
2671 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2674 static void sd_print_result(struct scsi_disk *sdkp, int result)
2676 sd_printk(KERN_INFO, sdkp, " ");
2677 scsi_show_result(result);