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 struct kmem_cache *sd_cdb_cache;
123 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 const int 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->cmd_type = REQ_TYPE_BLOCK_PC;
438 rq->timeout = SD_TIMEOUT;
440 memset(rq->cmd, 0, rq->cmd_len);
442 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
444 return BLKPREP_DEFER;
447 char *buf = page_address(page);
453 put_unaligned_be16(6 + 16, &buf[0]);
454 put_unaligned_be16(16, &buf[2]);
455 put_unaligned_be64(sector, &buf[8]);
456 put_unaligned_be32(nr_sectors, &buf[16]);
461 rq->cmd[0] = WRITE_SAME_16;
462 rq->cmd[1] = 0x8; /* UNMAP */
463 put_unaligned_be64(sector, &rq->cmd[2]);
464 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
466 len = sdkp->device->sector_size;
469 blk_add_request_payload(rq, page, len);
470 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
471 rq->buffer = page_address(page);
472 if (ret != BLKPREP_OK) {
479 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
481 /* for now, we use REQ_TYPE_BLOCK_PC. */
482 rq->cmd_type = REQ_TYPE_BLOCK_PC;
483 rq->timeout = SD_TIMEOUT;
484 rq->retries = SD_MAX_RETRIES;
485 rq->cmd[0] = SYNCHRONIZE_CACHE;
488 return scsi_setup_blk_pc_cmnd(sdp, rq);
491 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
493 if (rq->cmd_flags & REQ_DISCARD) {
494 free_page((unsigned long)rq->buffer);
500 * sd_init_command - build a scsi (read or write) command from
501 * information in the request structure.
502 * @SCpnt: pointer to mid-level's per scsi command structure that
503 * contains request and into which the scsi command is written
505 * Returns 1 if successful and 0 if error (or cannot be done now).
507 static int sd_prep_fn(struct request_queue *q, struct request *rq)
509 struct scsi_cmnd *SCpnt;
510 struct scsi_device *sdp = q->queuedata;
511 struct gendisk *disk = rq->rq_disk;
512 struct scsi_disk *sdkp;
513 sector_t block = blk_rq_pos(rq);
515 unsigned int this_count = blk_rq_sectors(rq);
517 unsigned char protect;
520 * Discard request come in as REQ_TYPE_FS but we turn them into
521 * block PC requests to make life easier.
523 if (rq->cmd_flags & REQ_DISCARD) {
524 ret = scsi_setup_discard_cmnd(sdp, rq);
526 } else if (rq->cmd_flags & REQ_FLUSH) {
527 ret = scsi_setup_flush_cmnd(sdp, rq);
529 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
530 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
532 } else if (rq->cmd_type != REQ_TYPE_FS) {
536 ret = scsi_setup_fs_cmnd(sdp, rq);
537 if (ret != BLKPREP_OK)
540 sdkp = scsi_disk(disk);
542 /* from here on until we're complete, any goto out
543 * is used for a killable error condition */
546 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
547 "sd_init_command: block=%llu, "
549 (unsigned long long)block,
552 if (!sdp || !scsi_device_online(sdp) ||
553 block + blk_rq_sectors(rq) > get_capacity(disk)) {
554 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
555 "Finishing %u sectors\n",
556 blk_rq_sectors(rq)));
557 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
558 "Retry with 0x%p\n", SCpnt));
564 * quietly refuse to do anything to a changed disc until
565 * the changed bit has been reset
567 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
572 * Some SD card readers can't handle multi-sector accesses which touch
573 * the last one or two hardware sectors. Split accesses as needed.
575 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
576 (sdp->sector_size / 512);
578 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
579 if (block < threshold) {
580 /* Access up to the threshold but not beyond */
581 this_count = threshold - block;
583 /* Access only a single hardware sector */
584 this_count = sdp->sector_size / 512;
588 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
589 (unsigned long long)block));
592 * If we have a 1K hardware sectorsize, prevent access to single
593 * 512 byte sectors. In theory we could handle this - in fact
594 * the scsi cdrom driver must be able to handle this because
595 * we typically use 1K blocksizes, and cdroms typically have
596 * 2K hardware sectorsizes. Of course, things are simpler
597 * with the cdrom, since it is read-only. For performance
598 * reasons, the filesystems should be able to handle this
599 * and not force the scsi disk driver to use bounce buffers
602 if (sdp->sector_size == 1024) {
603 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
604 scmd_printk(KERN_ERR, SCpnt,
605 "Bad block number requested\n");
609 this_count = this_count >> 1;
612 if (sdp->sector_size == 2048) {
613 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
614 scmd_printk(KERN_ERR, SCpnt,
615 "Bad block number requested\n");
619 this_count = this_count >> 2;
622 if (sdp->sector_size == 4096) {
623 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
624 scmd_printk(KERN_ERR, SCpnt,
625 "Bad block number requested\n");
629 this_count = this_count >> 3;
632 if (rq_data_dir(rq) == WRITE) {
633 if (!sdp->writeable) {
636 SCpnt->cmnd[0] = WRITE_6;
637 SCpnt->sc_data_direction = DMA_TO_DEVICE;
639 if (blk_integrity_rq(rq) &&
640 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
643 } else if (rq_data_dir(rq) == READ) {
644 SCpnt->cmnd[0] = READ_6;
645 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
647 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
651 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
652 "%s %d/%u 512 byte blocks.\n",
653 (rq_data_dir(rq) == WRITE) ?
654 "writing" : "reading", this_count,
655 blk_rq_sectors(rq)));
657 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
658 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
664 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
665 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
667 if (unlikely(SCpnt->cmnd == NULL)) {
672 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
673 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
674 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
675 SCpnt->cmnd[7] = 0x18;
676 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
677 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
680 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
681 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
682 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
683 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
684 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
685 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
686 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
687 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
689 /* Expected Indirect LBA */
690 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
691 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
692 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
693 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
695 /* Transfer length */
696 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
697 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
698 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
699 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
700 } else if (block > 0xffffffff) {
701 SCpnt->cmnd[0] += READ_16 - READ_6;
702 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
703 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
704 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
705 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
706 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
707 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
708 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
709 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
710 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
711 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
712 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
713 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
714 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
715 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
716 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
717 scsi_device_protection(SCpnt->device) ||
718 SCpnt->device->use_10_for_rw) {
719 if (this_count > 0xffff)
722 SCpnt->cmnd[0] += READ_10 - READ_6;
723 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
724 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
725 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
726 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
727 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
728 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
729 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
730 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
732 if (unlikely(rq->cmd_flags & REQ_FUA)) {
734 * This happens only if this drive failed
735 * 10byte rw command with ILLEGAL_REQUEST
736 * during operation and thus turned off
739 scmd_printk(KERN_ERR, SCpnt,
740 "FUA write on READ/WRITE(6) drive\n");
744 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
745 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
746 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
747 SCpnt->cmnd[4] = (unsigned char) this_count;
750 SCpnt->sdb.length = this_count * sdp->sector_size;
752 /* If DIF or DIX is enabled, tell HBA how to handle request */
753 if (host_dif || scsi_prot_sg_count(SCpnt))
754 sd_prot_op(SCpnt, host_dif);
757 * We shouldn't disconnect in the middle of a sector, so with a dumb
758 * host adapter, it's safe to assume that we can at least transfer
759 * this many bytes between each connect / disconnect.
761 SCpnt->transfersize = sdp->sector_size;
762 SCpnt->underflow = this_count << 9;
763 SCpnt->allowed = SD_MAX_RETRIES;
766 * This indicates that the command is ready from our end to be
771 return scsi_prep_return(q, rq, ret);
775 * sd_open - open a scsi disk device
776 * @inode: only i_rdev member may be used
777 * @filp: only f_mode and f_flags may be used
779 * Returns 0 if successful. Returns a negated errno value in case
782 * Note: This can be called from a user context (e.g. fsck(1) )
783 * or from within the kernel (e.g. as a result of a mount(1) ).
784 * In the latter case @inode and @filp carry an abridged amount
785 * of information as noted above.
787 static int sd_open(struct block_device *bdev, fmode_t mode)
789 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
790 struct scsi_device *sdev;
796 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
802 * If the device is in error recovery, wait until it is done.
803 * If the device is offline, then disallow any access to it.
806 if (!scsi_block_when_processing_errors(sdev))
809 if (sdev->removable || sdkp->write_prot)
810 check_disk_change(bdev);
813 * If the drive is empty, just let the open fail.
816 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
820 * If the device has the write protect tab set, have the open fail
821 * if the user expects to be able to write to the thing.
824 if (sdkp->write_prot && (mode & FMODE_WRITE))
828 * It is possible that the disk changing stuff resulted in
829 * the device being taken offline. If this is the case,
830 * report this to the user, and don't pretend that the
831 * open actually succeeded.
834 if (!scsi_device_online(sdev))
837 if (!sdkp->openers++ && sdev->removable) {
838 if (scsi_block_when_processing_errors(sdev))
839 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
852 * sd_release - invoked when the (last) close(2) is called on this
854 * @inode: only i_rdev member may be used
855 * @filp: only f_mode and f_flags may be used
859 * Note: may block (uninterruptible) if error recovery is underway
862 static int sd_release(struct gendisk *disk, fmode_t mode)
864 struct scsi_disk *sdkp = scsi_disk(disk);
865 struct scsi_device *sdev = sdkp->device;
867 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
870 if (!--sdkp->openers && sdev->removable) {
871 if (scsi_block_when_processing_errors(sdev))
872 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
876 * XXX and what if there are packets in flight and this close()
877 * XXX is followed by a "rmmod sd_mod"?
884 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
886 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
887 struct scsi_device *sdp = sdkp->device;
888 struct Scsi_Host *host = sdp->host;
891 /* default to most commonly used values */
892 diskinfo[0] = 0x40; /* 1 << 6 */
893 diskinfo[1] = 0x20; /* 1 << 5 */
894 diskinfo[2] = sdkp->capacity >> 11;
896 /* override with calculated, extended default, or driver values */
897 if (host->hostt->bios_param)
898 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
900 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
902 geo->heads = diskinfo[0];
903 geo->sectors = diskinfo[1];
904 geo->cylinders = diskinfo[2];
909 * sd_ioctl - process an ioctl
910 * @inode: only i_rdev/i_bdev members may be used
911 * @filp: only f_mode and f_flags may be used
912 * @cmd: ioctl command number
913 * @arg: this is third argument given to ioctl(2) system call.
914 * Often contains a pointer.
916 * Returns 0 if successful (some ioctls return postive numbers on
917 * success as well). Returns a negated errno value in case of error.
919 * Note: most ioctls are forward onto the block subsystem or further
920 * down in the scsi subsystem.
922 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
923 unsigned int cmd, unsigned long arg)
925 struct gendisk *disk = bdev->bd_disk;
926 struct scsi_device *sdp = scsi_disk(disk)->device;
927 void __user *p = (void __user *)arg;
930 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
931 disk->disk_name, cmd));
935 * If we are in the middle of error recovery, don't let anyone
936 * else try and use this device. Also, if error recovery fails, it
937 * may try and take the device offline, in which case all further
938 * access to the device is prohibited.
940 error = scsi_nonblockable_ioctl(sdp, cmd, p,
941 (mode & FMODE_NDELAY) != 0);
942 if (!scsi_block_when_processing_errors(sdp) || !error)
946 * Send SCSI addressing ioctls directly to mid level, send other
947 * ioctls to block level and then onto mid level if they can't be
951 case SCSI_IOCTL_GET_IDLUN:
952 case SCSI_IOCTL_GET_BUS_NUMBER:
953 error = scsi_ioctl(sdp, cmd, p);
956 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
957 if (error != -ENOTTY)
959 error = scsi_ioctl(sdp, cmd, p);
967 static void set_media_not_present(struct scsi_disk *sdkp)
969 sdkp->media_present = 0;
971 sdkp->device->changed = 1;
975 * sd_media_changed - check if our medium changed
976 * @disk: kernel device descriptor
978 * Returns 0 if not applicable or no change; 1 if change
980 * Note: this function is invoked from the block subsystem.
982 static int sd_media_changed(struct gendisk *disk)
984 struct scsi_disk *sdkp = scsi_disk(disk);
985 struct scsi_device *sdp = sdkp->device;
986 struct scsi_sense_hdr *sshdr = NULL;
989 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
995 * If the device is offline, don't send any commands - just pretend as
996 * if the command failed. If the device ever comes back online, we
997 * can deal with it then. It is only because of unrecoverable errors
998 * that we would ever take a device offline in the first place.
1000 if (!scsi_device_online(sdp)) {
1001 set_media_not_present(sdkp);
1007 * Using TEST_UNIT_READY enables differentiation between drive with
1008 * no cartridge loaded - NOT READY, drive with changed cartridge -
1009 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1011 * Drives that auto spin down. eg iomega jaz 1G, will be started
1012 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1013 * sd_revalidate() is called.
1017 if (scsi_block_when_processing_errors(sdp)) {
1018 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1019 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1024 * Unable to test, unit probably not ready. This usually
1025 * means there is no disc in the drive. Mark as changed,
1026 * and we will figure it out later once the drive is
1029 if (retval || (scsi_sense_valid(sshdr) &&
1030 /* 0x3a is medium not present */
1031 sshdr->asc == 0x3a)) {
1032 set_media_not_present(sdkp);
1038 * For removable scsi disk we have to recognise the presence
1039 * of a disk in the drive. This is kept in the struct scsi_disk
1040 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1042 sdkp->media_present = 1;
1044 retval = sdp->changed;
1047 if (retval != sdkp->previous_state)
1048 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1049 sdkp->previous_state = retval;
1054 static int sd_sync_cache(struct scsi_disk *sdkp)
1057 struct scsi_device *sdp = sdkp->device;
1058 struct scsi_sense_hdr sshdr;
1060 if (!scsi_device_online(sdp))
1064 for (retries = 3; retries > 0; --retries) {
1065 unsigned char cmd[10] = { 0 };
1067 cmd[0] = SYNCHRONIZE_CACHE;
1069 * Leave the rest of the command zero to indicate
1072 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1073 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1079 sd_print_result(sdkp, res);
1080 if (driver_byte(res) & DRIVER_SENSE)
1081 sd_print_sense_hdr(sdkp, &sshdr);
1089 static void sd_rescan(struct device *dev)
1091 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1094 revalidate_disk(sdkp->disk);
1095 scsi_disk_put(sdkp);
1100 #ifdef CONFIG_COMPAT
1102 * This gets directly called from VFS. When the ioctl
1103 * is not recognized we go back to the other translation paths.
1105 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1106 unsigned int cmd, unsigned long arg)
1108 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1111 * If we are in the middle of error recovery, don't let anyone
1112 * else try and use this device. Also, if error recovery fails, it
1113 * may try and take the device offline, in which case all further
1114 * access to the device is prohibited.
1116 if (!scsi_block_when_processing_errors(sdev))
1119 if (sdev->host->hostt->compat_ioctl) {
1122 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1128 * Let the static ioctl translation table take care of it.
1130 return -ENOIOCTLCMD;
1134 static const struct block_device_operations sd_fops = {
1135 .owner = THIS_MODULE,
1137 .release = sd_release,
1139 .getgeo = sd_getgeo,
1140 #ifdef CONFIG_COMPAT
1141 .compat_ioctl = sd_compat_ioctl,
1143 .media_changed = sd_media_changed,
1144 .revalidate_disk = sd_revalidate_disk,
1145 .unlock_native_capacity = sd_unlock_native_capacity,
1148 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1150 u64 start_lba = blk_rq_pos(scmd->request);
1151 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1155 if (scmd->request->cmd_type != REQ_TYPE_FS)
1158 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1159 SCSI_SENSE_BUFFERSIZE,
1164 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1167 if (scmd->device->sector_size < 512) {
1168 /* only legitimate sector_size here is 256 */
1172 /* be careful ... don't want any overflows */
1173 u64 factor = scmd->device->sector_size / 512;
1174 do_div(start_lba, factor);
1175 do_div(end_lba, factor);
1178 /* The bad lba was reported incorrectly, we have no idea where
1181 if (bad_lba < start_lba || bad_lba >= end_lba)
1184 /* This computation should always be done in terms of
1185 * the resolution of the device's medium.
1187 return (bad_lba - start_lba) * scmd->device->sector_size;
1191 * sd_done - bottom half handler: called when the lower level
1192 * driver has completed (successfully or otherwise) a scsi command.
1193 * @SCpnt: mid-level's per command structure.
1195 * Note: potentially run from within an ISR. Must not block.
1197 static int sd_done(struct scsi_cmnd *SCpnt)
1199 int result = SCpnt->result;
1200 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1201 struct scsi_sense_hdr sshdr;
1202 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1203 int sense_valid = 0;
1204 int sense_deferred = 0;
1207 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1209 sense_deferred = scsi_sense_is_deferred(&sshdr);
1211 #ifdef CONFIG_SCSI_LOGGING
1212 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1214 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1215 "sd_done: sb[respc,sk,asc,"
1216 "ascq]=%x,%x,%x,%x\n",
1217 sshdr.response_code,
1218 sshdr.sense_key, sshdr.asc,
1222 if (driver_byte(result) != DRIVER_SENSE &&
1223 (!sense_valid || sense_deferred))
1226 switch (sshdr.sense_key) {
1227 case HARDWARE_ERROR:
1229 good_bytes = sd_completed_bytes(SCpnt);
1231 case RECOVERED_ERROR:
1232 good_bytes = scsi_bufflen(SCpnt);
1235 /* This indicates a false check condition, so ignore it. An
1236 * unknown amount of data was transferred so treat it as an
1239 scsi_print_sense("sd", SCpnt);
1241 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1243 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1244 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1245 if (sshdr.asc == 0x10)
1246 good_bytes = sd_completed_bytes(SCpnt);
1252 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1253 sd_dif_complete(SCpnt, good_bytes);
1255 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1256 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1258 /* We have to print a failed command here as the
1259 * extended CDB gets freed before scsi_io_completion()
1263 scsi_print_command(SCpnt);
1265 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1273 static int media_not_present(struct scsi_disk *sdkp,
1274 struct scsi_sense_hdr *sshdr)
1277 if (!scsi_sense_valid(sshdr))
1279 /* not invoked for commands that could return deferred errors */
1280 if (sshdr->sense_key != NOT_READY &&
1281 sshdr->sense_key != UNIT_ATTENTION)
1283 if (sshdr->asc != 0x3A) /* medium not present */
1286 set_media_not_present(sdkp);
1291 * spinup disk - called only in sd_revalidate_disk()
1294 sd_spinup_disk(struct scsi_disk *sdkp)
1296 unsigned char cmd[10];
1297 unsigned long spintime_expire = 0;
1298 int retries, spintime;
1299 unsigned int the_result;
1300 struct scsi_sense_hdr sshdr;
1301 int sense_valid = 0;
1305 /* Spin up drives, as required. Only do this at boot time */
1306 /* Spinup needs to be done for module loads too. */
1311 cmd[0] = TEST_UNIT_READY;
1312 memset((void *) &cmd[1], 0, 9);
1314 the_result = scsi_execute_req(sdkp->device, cmd,
1317 SD_MAX_RETRIES, NULL);
1320 * If the drive has indicated to us that it
1321 * doesn't have any media in it, don't bother
1322 * with any more polling.
1324 if (media_not_present(sdkp, &sshdr))
1328 sense_valid = scsi_sense_valid(&sshdr);
1330 } while (retries < 3 &&
1331 (!scsi_status_is_good(the_result) ||
1332 ((driver_byte(the_result) & DRIVER_SENSE) &&
1333 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1335 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1336 /* no sense, TUR either succeeded or failed
1337 * with a status error */
1338 if(!spintime && !scsi_status_is_good(the_result)) {
1339 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1340 sd_print_result(sdkp, the_result);
1346 * The device does not want the automatic start to be issued.
1348 if (sdkp->device->no_start_on_add)
1351 if (sense_valid && sshdr.sense_key == NOT_READY) {
1352 if (sshdr.asc == 4 && sshdr.ascq == 3)
1353 break; /* manual intervention required */
1354 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1355 break; /* standby */
1356 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1357 break; /* unavailable */
1359 * Issue command to spin up drive when not ready
1362 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1363 cmd[0] = START_STOP;
1364 cmd[1] = 1; /* Return immediately */
1365 memset((void *) &cmd[2], 0, 8);
1366 cmd[4] = 1; /* Start spin cycle */
1367 if (sdkp->device->start_stop_pwr_cond)
1369 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1371 SD_TIMEOUT, SD_MAX_RETRIES,
1373 spintime_expire = jiffies + 100 * HZ;
1376 /* Wait 1 second for next try */
1381 * Wait for USB flash devices with slow firmware.
1382 * Yes, this sense key/ASC combination shouldn't
1383 * occur here. It's characteristic of these devices.
1385 } else if (sense_valid &&
1386 sshdr.sense_key == UNIT_ATTENTION &&
1387 sshdr.asc == 0x28) {
1389 spintime_expire = jiffies + 5 * HZ;
1392 /* Wait 1 second for next try */
1395 /* we don't understand the sense code, so it's
1396 * probably pointless to loop */
1398 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1399 sd_print_sense_hdr(sdkp, &sshdr);
1404 } while (spintime && time_before_eq(jiffies, spintime_expire));
1407 if (scsi_status_is_good(the_result))
1410 printk("not responding...\n");
1416 * Determine whether disk supports Data Integrity Field.
1418 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1420 struct scsi_device *sdp = sdkp->device;
1423 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1426 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1428 if (type == sdkp->protection_type || !sdkp->first_scan)
1431 sdkp->protection_type = type;
1433 if (type > SD_DIF_TYPE3_PROTECTION) {
1434 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1435 "protection type %u. Disabling disk!\n", type);
1440 if (scsi_host_dif_capable(sdp->host, type))
1441 sd_printk(KERN_NOTICE, sdkp,
1442 "Enabling DIF Type %u protection\n", type);
1444 sd_printk(KERN_NOTICE, sdkp,
1445 "Disabling DIF Type %u protection\n", type);
1448 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1449 struct scsi_sense_hdr *sshdr, int sense_valid,
1452 sd_print_result(sdkp, the_result);
1453 if (driver_byte(the_result) & DRIVER_SENSE)
1454 sd_print_sense_hdr(sdkp, sshdr);
1456 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1459 * Set dirty bit for removable devices if not ready -
1460 * sometimes drives will not report this properly.
1462 if (sdp->removable &&
1463 sense_valid && sshdr->sense_key == NOT_READY)
1467 * We used to set media_present to 0 here to indicate no media
1468 * in the drive, but some drives fail read capacity even with
1469 * media present, so we can't do that.
1471 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1475 #if RC16_LEN > SD_BUF_SIZE
1476 #error RC16_LEN must not be more than SD_BUF_SIZE
1479 #define READ_CAPACITY_RETRIES_ON_RESET 10
1481 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1482 unsigned char *buffer)
1484 unsigned char cmd[16];
1485 struct scsi_sense_hdr sshdr;
1486 int sense_valid = 0;
1488 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1489 unsigned int alignment;
1490 unsigned long long lba;
1491 unsigned sector_size;
1495 cmd[0] = SERVICE_ACTION_IN;
1496 cmd[1] = SAI_READ_CAPACITY_16;
1498 memset(buffer, 0, RC16_LEN);
1500 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1501 buffer, RC16_LEN, &sshdr,
1502 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1504 if (media_not_present(sdkp, &sshdr))
1508 sense_valid = scsi_sense_valid(&sshdr);
1510 sshdr.sense_key == ILLEGAL_REQUEST &&
1511 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1513 /* Invalid Command Operation Code or
1514 * Invalid Field in CDB, just retry
1515 * silently with RC10 */
1518 sshdr.sense_key == UNIT_ATTENTION &&
1519 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1520 /* Device reset might occur several times,
1521 * give it one more chance */
1522 if (--reset_retries > 0)
1527 } while (the_result && retries);
1530 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1531 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1535 sector_size = get_unaligned_be32(&buffer[8]);
1536 lba = get_unaligned_be64(&buffer[0]);
1538 sd_read_protection_type(sdkp, buffer);
1540 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1541 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1542 "kernel compiled with support for large block "
1548 /* Logical blocks per physical block exponent */
1549 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1551 /* Lowest aligned logical block */
1552 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1553 blk_queue_alignment_offset(sdp->request_queue, alignment);
1554 if (alignment && sdkp->first_scan)
1555 sd_printk(KERN_NOTICE, sdkp,
1556 "physical block alignment offset: %u\n", alignment);
1558 if (buffer[14] & 0x80) { /* TPE */
1559 struct request_queue *q = sdp->request_queue;
1561 sdkp->thin_provisioning = 1;
1562 q->limits.discard_granularity = sdkp->hw_sector_size;
1563 q->limits.max_discard_sectors = 0xffffffff;
1565 if (buffer[14] & 0x40) /* TPRZ */
1566 q->limits.discard_zeroes_data = 1;
1568 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1571 sdkp->capacity = lba + 1;
1575 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1576 unsigned char *buffer)
1578 unsigned char cmd[16];
1579 struct scsi_sense_hdr sshdr;
1580 int sense_valid = 0;
1582 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1584 unsigned sector_size;
1587 cmd[0] = READ_CAPACITY;
1588 memset(&cmd[1], 0, 9);
1589 memset(buffer, 0, 8);
1591 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1593 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1595 if (media_not_present(sdkp, &sshdr))
1599 sense_valid = scsi_sense_valid(&sshdr);
1601 sshdr.sense_key == UNIT_ATTENTION &&
1602 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1603 /* Device reset might occur several times,
1604 * give it one more chance */
1605 if (--reset_retries > 0)
1610 } while (the_result && retries);
1613 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1614 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1618 sector_size = get_unaligned_be32(&buffer[4]);
1619 lba = get_unaligned_be32(&buffer[0]);
1621 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1622 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1623 "kernel compiled with support for large block "
1629 sdkp->capacity = lba + 1;
1630 sdkp->hw_sector_size = sector_size;
1634 static int sd_try_rc16_first(struct scsi_device *sdp)
1636 if (sdp->host->max_cmd_len < 16)
1638 if (sdp->scsi_level > SCSI_SPC_2)
1640 if (scsi_device_protection(sdp))
1646 * read disk capacity
1649 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1652 struct scsi_device *sdp = sdkp->device;
1653 sector_t old_capacity = sdkp->capacity;
1655 if (sd_try_rc16_first(sdp)) {
1656 sector_size = read_capacity_16(sdkp, sdp, buffer);
1657 if (sector_size == -EOVERFLOW)
1659 if (sector_size == -ENODEV)
1661 if (sector_size < 0)
1662 sector_size = read_capacity_10(sdkp, sdp, buffer);
1663 if (sector_size < 0)
1666 sector_size = read_capacity_10(sdkp, sdp, buffer);
1667 if (sector_size == -EOVERFLOW)
1669 if (sector_size < 0)
1671 if ((sizeof(sdkp->capacity) > 4) &&
1672 (sdkp->capacity > 0xffffffffULL)) {
1673 int old_sector_size = sector_size;
1674 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1675 "Trying to use READ CAPACITY(16).\n");
1676 sector_size = read_capacity_16(sdkp, sdp, buffer);
1677 if (sector_size < 0) {
1678 sd_printk(KERN_NOTICE, sdkp,
1679 "Using 0xffffffff as device size\n");
1680 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1681 sector_size = old_sector_size;
1687 /* Some devices are known to return the total number of blocks,
1688 * not the highest block number. Some devices have versions
1689 * which do this and others which do not. Some devices we might
1690 * suspect of doing this but we don't know for certain.
1692 * If we know the reported capacity is wrong, decrement it. If
1693 * we can only guess, then assume the number of blocks is even
1694 * (usually true but not always) and err on the side of lowering
1697 if (sdp->fix_capacity ||
1698 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1699 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1700 "from its reported value: %llu\n",
1701 (unsigned long long) sdkp->capacity);
1706 if (sector_size == 0) {
1708 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1712 if (sector_size != 512 &&
1713 sector_size != 1024 &&
1714 sector_size != 2048 &&
1715 sector_size != 4096 &&
1716 sector_size != 256) {
1717 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1720 * The user might want to re-format the drive with
1721 * a supported sectorsize. Once this happens, it
1722 * would be relatively trivial to set the thing up.
1723 * For this reason, we leave the thing in the table.
1727 * set a bogus sector size so the normal read/write
1728 * logic in the block layer will eventually refuse any
1729 * request on this device without tripping over power
1730 * of two sector size assumptions
1734 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1737 char cap_str_2[10], cap_str_10[10];
1738 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1740 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1742 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1743 sizeof(cap_str_10));
1745 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1746 sd_printk(KERN_NOTICE, sdkp,
1747 "%llu %d-byte logical blocks: (%s/%s)\n",
1748 (unsigned long long)sdkp->capacity,
1749 sector_size, cap_str_10, cap_str_2);
1751 if (sdkp->hw_sector_size != sector_size)
1752 sd_printk(KERN_NOTICE, sdkp,
1753 "%u-byte physical blocks\n",
1754 sdkp->hw_sector_size);
1758 /* Rescale capacity to 512-byte units */
1759 if (sector_size == 4096)
1760 sdkp->capacity <<= 3;
1761 else if (sector_size == 2048)
1762 sdkp->capacity <<= 2;
1763 else if (sector_size == 1024)
1764 sdkp->capacity <<= 1;
1765 else if (sector_size == 256)
1766 sdkp->capacity >>= 1;
1768 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1769 sdkp->device->sector_size = sector_size;
1772 /* called with buffer of length 512 */
1774 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1775 unsigned char *buffer, int len, struct scsi_mode_data *data,
1776 struct scsi_sense_hdr *sshdr)
1778 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1779 SD_TIMEOUT, SD_MAX_RETRIES, data,
1784 * read write protect setting, if possible - called only in sd_revalidate_disk()
1785 * called with buffer of length SD_BUF_SIZE
1788 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1791 struct scsi_device *sdp = sdkp->device;
1792 struct scsi_mode_data data;
1793 int old_wp = sdkp->write_prot;
1795 set_disk_ro(sdkp->disk, 0);
1796 if (sdp->skip_ms_page_3f) {
1797 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1801 if (sdp->use_192_bytes_for_3f) {
1802 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1805 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1806 * We have to start carefully: some devices hang if we ask
1807 * for more than is available.
1809 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1812 * Second attempt: ask for page 0 When only page 0 is
1813 * implemented, a request for page 3F may return Sense Key
1814 * 5: Illegal Request, Sense Code 24: Invalid field in
1817 if (!scsi_status_is_good(res))
1818 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1821 * Third attempt: ask 255 bytes, as we did earlier.
1823 if (!scsi_status_is_good(res))
1824 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1828 if (!scsi_status_is_good(res)) {
1829 sd_printk(KERN_WARNING, sdkp,
1830 "Test WP failed, assume Write Enabled\n");
1832 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1833 set_disk_ro(sdkp->disk, sdkp->write_prot);
1834 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1835 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1836 sdkp->write_prot ? "on" : "off");
1837 sd_printk(KERN_DEBUG, sdkp,
1838 "Mode Sense: %02x %02x %02x %02x\n",
1839 buffer[0], buffer[1], buffer[2], buffer[3]);
1845 * sd_read_cache_type - called only from sd_revalidate_disk()
1846 * called with buffer of length SD_BUF_SIZE
1849 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1852 struct scsi_device *sdp = sdkp->device;
1856 struct scsi_mode_data data;
1857 struct scsi_sense_hdr sshdr;
1858 int old_wce = sdkp->WCE;
1859 int old_rcd = sdkp->RCD;
1860 int old_dpofua = sdkp->DPOFUA;
1862 if (sdp->skip_ms_page_8)
1865 if (sdp->type == TYPE_RBC) {
1873 /* cautiously ask */
1874 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1876 if (!scsi_status_is_good(res))
1879 if (!data.header_length) {
1881 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1884 /* that went OK, now ask for the proper length */
1888 * We're only interested in the first three bytes, actually.
1889 * But the data cache page is defined for the first 20.
1896 /* Take headers and block descriptors into account */
1897 len += data.header_length + data.block_descriptor_length;
1898 if (len > SD_BUF_SIZE)
1902 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1904 if (scsi_status_is_good(res)) {
1905 int offset = data.header_length + data.block_descriptor_length;
1907 if (offset >= SD_BUF_SIZE - 2) {
1908 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1912 if ((buffer[offset] & 0x3f) != modepage) {
1913 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1917 if (modepage == 8) {
1918 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1919 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1921 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1925 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1926 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1927 sd_printk(KERN_NOTICE, sdkp,
1928 "Uses READ/WRITE(6), disabling FUA\n");
1932 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1933 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1934 sd_printk(KERN_NOTICE, sdkp,
1935 "Write cache: %s, read cache: %s, %s\n",
1936 sdkp->WCE ? "enabled" : "disabled",
1937 sdkp->RCD ? "disabled" : "enabled",
1938 sdkp->DPOFUA ? "supports DPO and FUA"
1939 : "doesn't support DPO or FUA");
1945 if (scsi_sense_valid(&sshdr) &&
1946 sshdr.sense_key == ILLEGAL_REQUEST &&
1947 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1948 /* Invalid field in CDB */
1949 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1951 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1954 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1961 * The ATO bit indicates whether the DIF application tag is available
1962 * for use by the operating system.
1964 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1967 struct scsi_device *sdp = sdkp->device;
1968 struct scsi_mode_data data;
1969 struct scsi_sense_hdr sshdr;
1971 if (sdp->type != TYPE_DISK)
1974 if (sdkp->protection_type == 0)
1977 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1978 SD_MAX_RETRIES, &data, &sshdr);
1980 if (!scsi_status_is_good(res) || !data.header_length ||
1982 sd_printk(KERN_WARNING, sdkp,
1983 "getting Control mode page failed, assume no ATO\n");
1985 if (scsi_sense_valid(&sshdr))
1986 sd_print_sense_hdr(sdkp, &sshdr);
1991 offset = data.header_length + data.block_descriptor_length;
1993 if ((buffer[offset] & 0x3f) != 0x0a) {
1994 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1998 if ((buffer[offset + 5] & 0x80) == 0)
2007 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2008 * @disk: disk to query
2010 static void sd_read_block_limits(struct scsi_disk *sdkp)
2012 struct request_queue *q = sdkp->disk->queue;
2013 unsigned int sector_sz = sdkp->device->sector_size;
2014 const int vpd_len = 64;
2015 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2018 /* Block Limits VPD */
2019 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2022 blk_queue_io_min(sdkp->disk->queue,
2023 get_unaligned_be16(&buffer[6]) * sector_sz);
2024 blk_queue_io_opt(sdkp->disk->queue,
2025 get_unaligned_be32(&buffer[12]) * sector_sz);
2027 /* Thin provisioning enabled and page length indicates TP support */
2028 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2029 unsigned int lba_count, desc_count, granularity;
2031 lba_count = get_unaligned_be32(&buffer[20]);
2032 desc_count = get_unaligned_be32(&buffer[24]);
2035 q->limits.max_discard_sectors =
2036 lba_count * sector_sz >> 9;
2042 granularity = get_unaligned_be32(&buffer[28]);
2045 q->limits.discard_granularity = granularity * sector_sz;
2047 if (buffer[32] & 0x80)
2048 q->limits.discard_alignment =
2049 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2057 * sd_read_block_characteristics - Query block dev. characteristics
2058 * @disk: disk to query
2060 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2062 unsigned char *buffer;
2064 const int vpd_len = 64;
2066 buffer = kmalloc(vpd_len, GFP_KERNEL);
2069 /* Block Device Characteristics VPD */
2070 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2073 rot = get_unaligned_be16(&buffer[4]);
2076 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2082 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2085 * Although VPD inquiries can go to SCSI-2 type devices,
2086 * some USB ones crash on receiving them, and the pages
2087 * we currently ask for are for SPC-3 and beyond
2089 if (sdp->scsi_level > SCSI_SPC_2)
2095 * sd_revalidate_disk - called the first time a new disk is seen,
2096 * performs disk spin up, read_capacity, etc.
2097 * @disk: struct gendisk we care about
2099 static int sd_revalidate_disk(struct gendisk *disk)
2101 struct scsi_disk *sdkp = scsi_disk(disk);
2102 struct scsi_device *sdp = sdkp->device;
2103 unsigned char *buffer;
2106 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2107 "sd_revalidate_disk\n"));
2110 * If the device is offline, don't try and read capacity or any
2111 * of the other niceties.
2113 if (!scsi_device_online(sdp))
2116 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2118 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2119 "allocation failure.\n");
2123 sd_spinup_disk(sdkp);
2126 * Without media there is no reason to ask; moreover, some devices
2127 * react badly if we do.
2129 if (sdkp->media_present) {
2130 sd_read_capacity(sdkp, buffer);
2132 if (sd_try_extended_inquiry(sdp)) {
2133 sd_read_block_limits(sdkp);
2134 sd_read_block_characteristics(sdkp);
2137 sd_read_write_protect_flag(sdkp, buffer);
2138 sd_read_cache_type(sdkp, buffer);
2139 sd_read_app_tag_own(sdkp, buffer);
2142 sdkp->first_scan = 0;
2145 * We now have all cache related info, determine how we deal
2146 * with ordered requests. Note that as the current SCSI
2147 * dispatch function can alter request order, we cannot use
2148 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2151 ordered = sdkp->DPOFUA
2152 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2154 ordered = QUEUE_ORDERED_DRAIN;
2156 blk_queue_ordered(sdkp->disk->queue, ordered);
2158 set_capacity(disk, sdkp->capacity);
2166 * sd_unlock_native_capacity - unlock native capacity
2167 * @disk: struct gendisk to set capacity for
2169 * Block layer calls this function if it detects that partitions
2170 * on @disk reach beyond the end of the device. If the SCSI host
2171 * implements ->unlock_native_capacity() method, it's invoked to
2172 * give it a chance to adjust the device capacity.
2175 * Defined by block layer. Might sleep.
2177 static void sd_unlock_native_capacity(struct gendisk *disk)
2179 struct scsi_device *sdev = scsi_disk(disk)->device;
2181 if (sdev->host->hostt->unlock_native_capacity)
2182 sdev->host->hostt->unlock_native_capacity(sdev);
2186 * sd_format_disk_name - format disk name
2187 * @prefix: name prefix - ie. "sd" for SCSI disks
2188 * @index: index of the disk to format name for
2189 * @buf: output buffer
2190 * @buflen: length of the output buffer
2192 * SCSI disk names starts at sda. The 26th device is sdz and the
2193 * 27th is sdaa. The last one for two lettered suffix is sdzz
2194 * which is followed by sdaaa.
2196 * This is basically 26 base counting with one extra 'nil' entry
2197 * at the beginning from the second digit on and can be
2198 * determined using similar method as 26 base conversion with the
2199 * index shifted -1 after each digit is computed.
2205 * 0 on success, -errno on failure.
2207 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2209 const int base = 'z' - 'a' + 1;
2210 char *begin = buf + strlen(prefix);
2211 char *end = buf + buflen;
2221 *--p = 'a' + (index % unit);
2222 index = (index / unit) - 1;
2223 } while (index >= 0);
2225 memmove(begin, p, end - p);
2226 memcpy(buf, prefix, strlen(prefix));
2232 * The asynchronous part of sd_probe
2234 static void sd_probe_async(void *data, async_cookie_t cookie)
2236 struct scsi_disk *sdkp = data;
2237 struct scsi_device *sdp;
2244 index = sdkp->index;
2245 dev = &sdp->sdev_gendev;
2247 if (index < SD_MAX_DISKS) {
2248 gd->major = sd_major((index & 0xf0) >> 4);
2249 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2250 gd->minors = SD_MINORS;
2252 gd->fops = &sd_fops;
2253 gd->private_data = &sdkp->driver;
2254 gd->queue = sdkp->device->request_queue;
2256 /* defaults, until the device tells us otherwise */
2257 sdp->sector_size = 512;
2259 sdkp->media_present = 1;
2260 sdkp->write_prot = 0;
2264 sdkp->first_scan = 1;
2266 sd_revalidate_disk(gd);
2268 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2269 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2271 gd->driverfs_dev = &sdp->sdev_gendev;
2272 gd->flags = GENHD_FL_EXT_DEVT;
2274 gd->flags |= GENHD_FL_REMOVABLE;
2276 dev_set_drvdata(dev, sdkp);
2278 sd_dif_config_host(sdkp);
2280 sd_revalidate_disk(gd);
2282 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2283 sdp->removable ? "removable " : "");
2284 put_device(&sdkp->dev);
2288 * sd_probe - called during driver initialization and whenever a
2289 * new scsi device is attached to the system. It is called once
2290 * for each scsi device (not just disks) present.
2291 * @dev: pointer to device object
2293 * Returns 0 if successful (or not interested in this scsi device
2294 * (e.g. scanner)); 1 when there is an error.
2296 * Note: this function is invoked from the scsi mid-level.
2297 * This function sets up the mapping between a given
2298 * <host,channel,id,lun> (found in sdp) and new device name
2299 * (e.g. /dev/sda). More precisely it is the block device major
2300 * and minor number that is chosen here.
2302 * Assume sd_attach is not re-entrant (for time being)
2303 * Also think about sd_attach() and sd_remove() running coincidentally.
2305 static int sd_probe(struct device *dev)
2307 struct scsi_device *sdp = to_scsi_device(dev);
2308 struct scsi_disk *sdkp;
2314 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2317 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2321 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2325 gd = alloc_disk(SD_MINORS);
2330 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2333 spin_lock(&sd_index_lock);
2334 error = ida_get_new(&sd_index_ida, &index);
2335 spin_unlock(&sd_index_lock);
2336 } while (error == -EAGAIN);
2341 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2343 goto out_free_index;
2346 sdkp->driver = &sd_template;
2348 sdkp->index = index;
2350 sdkp->previous_state = 1;
2352 if (!sdp->request_queue->rq_timeout) {
2353 if (sdp->type != TYPE_MOD)
2354 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2356 blk_queue_rq_timeout(sdp->request_queue,
2360 device_initialize(&sdkp->dev);
2361 sdkp->dev.parent = &sdp->sdev_gendev;
2362 sdkp->dev.class = &sd_disk_class;
2363 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2365 if (device_add(&sdkp->dev))
2366 goto out_free_index;
2368 get_device(&sdp->sdev_gendev);
2370 get_device(&sdkp->dev); /* prevent release before async_schedule */
2371 async_schedule(sd_probe_async, sdkp);
2376 spin_lock(&sd_index_lock);
2377 ida_remove(&sd_index_ida, index);
2378 spin_unlock(&sd_index_lock);
2388 * sd_remove - called whenever a scsi disk (previously recognized by
2389 * sd_probe) is detached from the system. It is called (potentially
2390 * multiple times) during sd module unload.
2391 * @sdp: pointer to mid level scsi device object
2393 * Note: this function is invoked from the scsi mid-level.
2394 * This function potentially frees up a device name (e.g. /dev/sdc)
2395 * that could be re-used by a subsequent sd_probe().
2396 * This function is not called when the built-in sd driver is "exit-ed".
2398 static int sd_remove(struct device *dev)
2400 struct scsi_disk *sdkp;
2402 async_synchronize_full();
2403 sdkp = dev_get_drvdata(dev);
2404 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2405 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2406 device_del(&sdkp->dev);
2407 del_gendisk(sdkp->disk);
2410 mutex_lock(&sd_ref_mutex);
2411 dev_set_drvdata(dev, NULL);
2412 put_device(&sdkp->dev);
2413 mutex_unlock(&sd_ref_mutex);
2419 * scsi_disk_release - Called to free the scsi_disk structure
2420 * @dev: pointer to embedded class device
2422 * sd_ref_mutex must be held entering this routine. Because it is
2423 * called on last put, you should always use the scsi_disk_get()
2424 * scsi_disk_put() helpers which manipulate the semaphore directly
2425 * and never do a direct put_device.
2427 static void scsi_disk_release(struct device *dev)
2429 struct scsi_disk *sdkp = to_scsi_disk(dev);
2430 struct gendisk *disk = sdkp->disk;
2432 spin_lock(&sd_index_lock);
2433 ida_remove(&sd_index_ida, sdkp->index);
2434 spin_unlock(&sd_index_lock);
2436 disk->private_data = NULL;
2438 put_device(&sdkp->device->sdev_gendev);
2443 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2445 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2446 struct scsi_sense_hdr sshdr;
2447 struct scsi_device *sdp = sdkp->device;
2451 cmd[4] |= 1; /* START */
2453 if (sdp->start_stop_pwr_cond)
2454 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2456 if (!scsi_device_online(sdp))
2459 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2460 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2462 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2463 sd_print_result(sdkp, res);
2464 if (driver_byte(res) & DRIVER_SENSE)
2465 sd_print_sense_hdr(sdkp, &sshdr);
2472 * Send a SYNCHRONIZE CACHE instruction down to the device through
2473 * the normal SCSI command structure. Wait for the command to
2476 static void sd_shutdown(struct device *dev)
2478 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2481 return; /* this can happen */
2484 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2485 sd_sync_cache(sdkp);
2488 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2489 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2490 sd_start_stop_device(sdkp, 0);
2493 scsi_disk_put(sdkp);
2496 static int sd_suspend(struct device *dev, pm_message_t mesg)
2498 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2502 return 0; /* this can happen */
2505 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2506 ret = sd_sync_cache(sdkp);
2511 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2512 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2513 ret = sd_start_stop_device(sdkp, 0);
2517 scsi_disk_put(sdkp);
2521 static int sd_resume(struct device *dev)
2523 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2526 if (!sdkp->device->manage_start_stop)
2529 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2530 ret = sd_start_stop_device(sdkp, 1);
2533 scsi_disk_put(sdkp);
2538 * init_sd - entry point for this driver (both when built in or when
2541 * Note: this function registers this driver with the scsi mid-level.
2543 static int __init init_sd(void)
2545 int majors = 0, i, err;
2547 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2549 for (i = 0; i < SD_MAJORS; i++)
2550 if (register_blkdev(sd_major(i), "sd") == 0)
2556 err = class_register(&sd_disk_class);
2560 err = scsi_register_driver(&sd_template.gendrv);
2564 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2566 if (!sd_cdb_cache) {
2567 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2571 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2573 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2580 kmem_cache_destroy(sd_cdb_cache);
2583 class_unregister(&sd_disk_class);
2585 for (i = 0; i < SD_MAJORS; i++)
2586 unregister_blkdev(sd_major(i), "sd");
2591 * exit_sd - exit point for this driver (when it is a module).
2593 * Note: this function unregisters this driver from the scsi mid-level.
2595 static void __exit exit_sd(void)
2599 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2601 mempool_destroy(sd_cdb_pool);
2602 kmem_cache_destroy(sd_cdb_cache);
2604 scsi_unregister_driver(&sd_template.gendrv);
2605 class_unregister(&sd_disk_class);
2607 for (i = 0; i < SD_MAJORS; i++)
2608 unregister_blkdev(sd_major(i), "sd");
2611 module_init(init_sd);
2612 module_exit(exit_sd);
2614 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2615 struct scsi_sense_hdr *sshdr)
2617 sd_printk(KERN_INFO, sdkp, "");
2618 scsi_show_sense_hdr(sshdr);
2619 sd_printk(KERN_INFO, sdkp, "");
2620 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2623 static void sd_print_result(struct scsi_disk *sdkp, int result)
2625 sd_printk(KERN_INFO, sdkp, "");
2626 scsi_show_result(result);