2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
35 #include <linux/module.h>
37 #include <linux/kernel.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <asm/uaccess.h>
54 #include <asm/unaligned.h>
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_cmnd.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h>
64 #include <scsi/scsicam.h>
67 #include "scsi_logging.h"
69 MODULE_AUTHOR("Eric Youngdale");
70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
71 MODULE_LICENSE("GPL");
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
99 static int sd_revalidate_disk(struct gendisk *);
100 static int sd_probe(struct device *);
101 static int sd_remove(struct device *);
102 static void sd_shutdown(struct device *);
103 static int sd_suspend(struct device *, pm_message_t state);
104 static int sd_resume(struct device *);
105 static void sd_rescan(struct device *);
106 static int sd_done(struct scsi_cmnd *);
107 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
108 static void scsi_disk_release(struct device *cdev);
109 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
110 static void sd_print_result(struct scsi_disk *, int);
112 static DEFINE_SPINLOCK(sd_index_lock);
113 static DEFINE_IDA(sd_index_ida);
115 /* This semaphore is used to mediate the 0->1 reference get in the
116 * face of object destruction (i.e. we can't allow a get on an
117 * object after last put) */
118 static DEFINE_MUTEX(sd_ref_mutex);
120 struct kmem_cache *sd_cdb_cache;
121 mempool_t *sd_cdb_pool;
123 static const char *sd_cache_types[] = {
124 "write through", "none", "write back",
125 "write back, no read (daft)"
129 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
130 const char *buf, size_t count)
132 int i, ct = -1, rcd, wce, sp;
133 struct scsi_disk *sdkp = to_scsi_disk(dev);
134 struct scsi_device *sdp = sdkp->device;
137 struct scsi_mode_data data;
138 struct scsi_sense_hdr sshdr;
141 if (sdp->type != TYPE_DISK)
142 /* no cache control on RBC devices; theoretically they
143 * can do it, but there's probably so many exceptions
144 * it's not worth the risk */
147 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
148 const int len = strlen(sd_cache_types[i]);
149 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
157 rcd = ct & 0x01 ? 1 : 0;
158 wce = ct & 0x02 ? 1 : 0;
159 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
160 SD_MAX_RETRIES, &data, NULL))
162 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
163 data.block_descriptor_length);
164 buffer_data = buffer + data.header_length +
165 data.block_descriptor_length;
166 buffer_data[2] &= ~0x05;
167 buffer_data[2] |= wce << 2 | rcd;
168 sp = buffer_data[0] & 0x80 ? 1 : 0;
170 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
171 SD_MAX_RETRIES, &data, &sshdr)) {
172 if (scsi_sense_valid(&sshdr))
173 sd_print_sense_hdr(sdkp, &sshdr);
176 revalidate_disk(sdkp->disk);
181 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
182 const char *buf, size_t count)
184 struct scsi_disk *sdkp = to_scsi_disk(dev);
185 struct scsi_device *sdp = sdkp->device;
187 if (!capable(CAP_SYS_ADMIN))
190 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
196 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
197 const char *buf, size_t count)
199 struct scsi_disk *sdkp = to_scsi_disk(dev);
200 struct scsi_device *sdp = sdkp->device;
202 if (!capable(CAP_SYS_ADMIN))
205 if (sdp->type != TYPE_DISK)
208 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
214 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
217 struct scsi_disk *sdkp = to_scsi_disk(dev);
218 int ct = sdkp->RCD + 2*sdkp->WCE;
220 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
224 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
226 struct scsi_disk *sdkp = to_scsi_disk(dev);
228 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
232 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
235 struct scsi_disk *sdkp = to_scsi_disk(dev);
236 struct scsi_device *sdp = sdkp->device;
238 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
242 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
245 struct scsi_disk *sdkp = to_scsi_disk(dev);
247 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
251 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
254 struct scsi_disk *sdkp = to_scsi_disk(dev);
256 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
260 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
263 struct scsi_disk *sdkp = to_scsi_disk(dev);
265 return snprintf(buf, 20, "%u\n", sdkp->ATO);
269 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
272 struct scsi_disk *sdkp = to_scsi_disk(dev);
274 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
277 static struct device_attribute sd_disk_attrs[] = {
278 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
279 sd_store_cache_type),
280 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
281 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
282 sd_store_allow_restart),
283 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
284 sd_store_manage_start_stop),
285 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
286 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
287 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
291 static struct class sd_disk_class = {
293 .owner = THIS_MODULE,
294 .dev_release = scsi_disk_release,
295 .dev_attrs = sd_disk_attrs,
298 static struct scsi_driver sd_template = {
299 .owner = THIS_MODULE,
304 .suspend = sd_suspend,
306 .shutdown = sd_shutdown,
313 * Device no to disk mapping:
315 * major disc2 disc p1
316 * |............|.............|....|....| <- dev_t
319 * Inside a major, we have 16k disks, however mapped non-
320 * contiguously. The first 16 disks are for major0, the next
321 * ones with major1, ... Disk 256 is for major0 again, disk 272
323 * As we stay compatible with our numbering scheme, we can reuse
324 * the well-know SCSI majors 8, 65--71, 136--143.
326 static int sd_major(int major_idx)
330 return SCSI_DISK0_MAJOR;
332 return SCSI_DISK1_MAJOR + major_idx - 1;
334 return SCSI_DISK8_MAJOR + major_idx - 8;
337 return 0; /* shut up gcc */
341 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
343 struct scsi_disk *sdkp = NULL;
345 if (disk->private_data) {
346 sdkp = scsi_disk(disk);
347 if (scsi_device_get(sdkp->device) == 0)
348 get_device(&sdkp->dev);
355 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
357 struct scsi_disk *sdkp;
359 mutex_lock(&sd_ref_mutex);
360 sdkp = __scsi_disk_get(disk);
361 mutex_unlock(&sd_ref_mutex);
365 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
367 struct scsi_disk *sdkp;
369 mutex_lock(&sd_ref_mutex);
370 sdkp = dev_get_drvdata(dev);
372 sdkp = __scsi_disk_get(sdkp->disk);
373 mutex_unlock(&sd_ref_mutex);
377 static void scsi_disk_put(struct scsi_disk *sdkp)
379 struct scsi_device *sdev = sdkp->device;
381 mutex_lock(&sd_ref_mutex);
382 put_device(&sdkp->dev);
383 scsi_device_put(sdev);
384 mutex_unlock(&sd_ref_mutex);
387 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
389 unsigned int prot_op = SCSI_PROT_NORMAL;
390 unsigned int dix = scsi_prot_sg_count(scmd);
392 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
394 prot_op = SCSI_PROT_READ_PASS;
395 else if (dif && !dix)
396 prot_op = SCSI_PROT_READ_STRIP;
397 else if (!dif && dix)
398 prot_op = SCSI_PROT_READ_INSERT;
401 prot_op = SCSI_PROT_WRITE_PASS;
402 else if (dif && !dix)
403 prot_op = SCSI_PROT_WRITE_INSERT;
404 else if (!dif && dix)
405 prot_op = SCSI_PROT_WRITE_STRIP;
408 scsi_set_prot_op(scmd, prot_op);
409 scsi_set_prot_type(scmd, dif);
413 * sd_prepare_discard - unmap blocks on thinly provisioned device
414 * @rq: Request to prepare
416 * Will issue either UNMAP or WRITE SAME(16) depending on preference
417 * indicated by target device.
419 static int sd_prepare_discard(struct request *rq)
421 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
422 struct bio *bio = rq->bio;
423 sector_t sector = bio->bi_sector;
424 unsigned int num = bio_sectors(bio);
426 if (sdkp->device->sector_size == 4096) {
431 rq->cmd_type = REQ_TYPE_BLOCK_PC;
432 rq->timeout = SD_TIMEOUT;
434 memset(rq->cmd, 0, rq->cmd_len);
437 char *buf = kmap_atomic(bio_page(bio), KM_USER0);
443 /* Ensure that data length matches payload */
444 rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24;
446 put_unaligned_be16(6 + 16, &buf[0]);
447 put_unaligned_be16(16, &buf[2]);
448 put_unaligned_be64(sector, &buf[8]);
449 put_unaligned_be32(num, &buf[16]);
451 kunmap_atomic(buf, KM_USER0);
453 rq->cmd[0] = WRITE_SAME_16;
454 rq->cmd[1] = 0x8; /* UNMAP */
455 put_unaligned_be64(sector, &rq->cmd[2]);
456 put_unaligned_be32(num, &rq->cmd[10]);
464 * sd_init_command - build a scsi (read or write) command from
465 * information in the request structure.
466 * @SCpnt: pointer to mid-level's per scsi command structure that
467 * contains request and into which the scsi command is written
469 * Returns 1 if successful and 0 if error (or cannot be done now).
471 static int sd_prep_fn(struct request_queue *q, struct request *rq)
473 struct scsi_cmnd *SCpnt;
474 struct scsi_device *sdp = q->queuedata;
475 struct gendisk *disk = rq->rq_disk;
476 struct scsi_disk *sdkp;
477 sector_t block = blk_rq_pos(rq);
479 unsigned int this_count = blk_rq_sectors(rq);
481 unsigned char protect;
484 * Discard request come in as REQ_TYPE_FS but we turn them into
485 * block PC requests to make life easier.
487 if (blk_discard_rq(rq))
488 ret = sd_prepare_discard(rq);
490 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
491 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
493 } else if (rq->cmd_type != REQ_TYPE_FS) {
497 ret = scsi_setup_fs_cmnd(sdp, rq);
498 if (ret != BLKPREP_OK)
501 sdkp = scsi_disk(disk);
503 /* from here on until we're complete, any goto out
504 * is used for a killable error condition */
507 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
508 "sd_init_command: block=%llu, "
510 (unsigned long long)block,
513 if (!sdp || !scsi_device_online(sdp) ||
514 block + blk_rq_sectors(rq) > get_capacity(disk)) {
515 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
516 "Finishing %u sectors\n",
517 blk_rq_sectors(rq)));
518 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
519 "Retry with 0x%p\n", SCpnt));
525 * quietly refuse to do anything to a changed disc until
526 * the changed bit has been reset
528 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
533 * Some SD card readers can't handle multi-sector accesses which touch
534 * the last one or two hardware sectors. Split accesses as needed.
536 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
537 (sdp->sector_size / 512);
539 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
540 if (block < threshold) {
541 /* Access up to the threshold but not beyond */
542 this_count = threshold - block;
544 /* Access only a single hardware sector */
545 this_count = sdp->sector_size / 512;
549 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
550 (unsigned long long)block));
553 * If we have a 1K hardware sectorsize, prevent access to single
554 * 512 byte sectors. In theory we could handle this - in fact
555 * the scsi cdrom driver must be able to handle this because
556 * we typically use 1K blocksizes, and cdroms typically have
557 * 2K hardware sectorsizes. Of course, things are simpler
558 * with the cdrom, since it is read-only. For performance
559 * reasons, the filesystems should be able to handle this
560 * and not force the scsi disk driver to use bounce buffers
563 if (sdp->sector_size == 1024) {
564 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
565 scmd_printk(KERN_ERR, SCpnt,
566 "Bad block number requested\n");
570 this_count = this_count >> 1;
573 if (sdp->sector_size == 2048) {
574 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
575 scmd_printk(KERN_ERR, SCpnt,
576 "Bad block number requested\n");
580 this_count = this_count >> 2;
583 if (sdp->sector_size == 4096) {
584 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
585 scmd_printk(KERN_ERR, SCpnt,
586 "Bad block number requested\n");
590 this_count = this_count >> 3;
593 if (rq_data_dir(rq) == WRITE) {
594 if (!sdp->writeable) {
597 SCpnt->cmnd[0] = WRITE_6;
598 SCpnt->sc_data_direction = DMA_TO_DEVICE;
600 if (blk_integrity_rq(rq) &&
601 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
604 } else if (rq_data_dir(rq) == READ) {
605 SCpnt->cmnd[0] = READ_6;
606 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
608 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
612 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
613 "%s %d/%u 512 byte blocks.\n",
614 (rq_data_dir(rq) == WRITE) ?
615 "writing" : "reading", this_count,
616 blk_rq_sectors(rq)));
618 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
619 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
625 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
626 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
628 if (unlikely(SCpnt->cmnd == NULL)) {
633 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
634 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
635 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
636 SCpnt->cmnd[7] = 0x18;
637 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
638 SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
641 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
642 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
643 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
644 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
645 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
646 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
647 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
648 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
650 /* Expected Indirect LBA */
651 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
652 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
653 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
654 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
656 /* Transfer length */
657 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
658 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
659 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
660 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
661 } else if (block > 0xffffffff) {
662 SCpnt->cmnd[0] += READ_16 - READ_6;
663 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
664 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
665 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
666 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
667 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
668 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
669 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
670 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
671 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
672 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
673 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
674 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
675 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
676 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
677 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
678 scsi_device_protection(SCpnt->device) ||
679 SCpnt->device->use_10_for_rw) {
680 if (this_count > 0xffff)
683 SCpnt->cmnd[0] += READ_10 - READ_6;
684 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
685 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
686 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
687 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
688 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
689 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
690 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
691 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
693 if (unlikely(blk_fua_rq(rq))) {
695 * This happens only if this drive failed
696 * 10byte rw command with ILLEGAL_REQUEST
697 * during operation and thus turned off
700 scmd_printk(KERN_ERR, SCpnt,
701 "FUA write on READ/WRITE(6) drive\n");
705 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
706 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
707 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
708 SCpnt->cmnd[4] = (unsigned char) this_count;
711 SCpnt->sdb.length = this_count * sdp->sector_size;
713 /* If DIF or DIX is enabled, tell HBA how to handle request */
714 if (host_dif || scsi_prot_sg_count(SCpnt))
715 sd_prot_op(SCpnt, host_dif);
718 * We shouldn't disconnect in the middle of a sector, so with a dumb
719 * host adapter, it's safe to assume that we can at least transfer
720 * this many bytes between each connect / disconnect.
722 SCpnt->transfersize = sdp->sector_size;
723 SCpnt->underflow = this_count << 9;
724 SCpnt->allowed = SD_MAX_RETRIES;
727 * This indicates that the command is ready from our end to be
732 return scsi_prep_return(q, rq, ret);
736 * sd_open - open a scsi disk device
737 * @inode: only i_rdev member may be used
738 * @filp: only f_mode and f_flags may be used
740 * Returns 0 if successful. Returns a negated errno value in case
743 * Note: This can be called from a user context (e.g. fsck(1) )
744 * or from within the kernel (e.g. as a result of a mount(1) ).
745 * In the latter case @inode and @filp carry an abridged amount
746 * of information as noted above.
748 static int sd_open(struct block_device *bdev, fmode_t mode)
750 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
751 struct scsi_device *sdev;
757 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
762 * If the device is in error recovery, wait until it is done.
763 * If the device is offline, then disallow any access to it.
766 if (!scsi_block_when_processing_errors(sdev))
769 if (sdev->removable || sdkp->write_prot)
770 check_disk_change(bdev);
773 * If the drive is empty, just let the open fail.
776 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
780 * If the device has the write protect tab set, have the open fail
781 * if the user expects to be able to write to the thing.
784 if (sdkp->write_prot && (mode & FMODE_WRITE))
788 * It is possible that the disk changing stuff resulted in
789 * the device being taken offline. If this is the case,
790 * report this to the user, and don't pretend that the
791 * open actually succeeded.
794 if (!scsi_device_online(sdev))
797 if (!sdkp->openers++ && sdev->removable) {
798 if (scsi_block_when_processing_errors(sdev))
799 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
810 * sd_release - invoked when the (last) close(2) is called on this
812 * @inode: only i_rdev member may be used
813 * @filp: only f_mode and f_flags may be used
817 * Note: may block (uninterruptible) if error recovery is underway
820 static int sd_release(struct gendisk *disk, fmode_t mode)
822 struct scsi_disk *sdkp = scsi_disk(disk);
823 struct scsi_device *sdev = sdkp->device;
825 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
827 if (!--sdkp->openers && sdev->removable) {
828 if (scsi_block_when_processing_errors(sdev))
829 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
833 * XXX and what if there are packets in flight and this close()
834 * XXX is followed by a "rmmod sd_mod"?
840 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
842 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
843 struct scsi_device *sdp = sdkp->device;
844 struct Scsi_Host *host = sdp->host;
847 /* default to most commonly used values */
848 diskinfo[0] = 0x40; /* 1 << 6 */
849 diskinfo[1] = 0x20; /* 1 << 5 */
850 diskinfo[2] = sdkp->capacity >> 11;
852 /* override with calculated, extended default, or driver values */
853 if (host->hostt->bios_param)
854 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
856 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
858 geo->heads = diskinfo[0];
859 geo->sectors = diskinfo[1];
860 geo->cylinders = diskinfo[2];
865 * sd_ioctl - process an ioctl
866 * @inode: only i_rdev/i_bdev members may be used
867 * @filp: only f_mode and f_flags may be used
868 * @cmd: ioctl command number
869 * @arg: this is third argument given to ioctl(2) system call.
870 * Often contains a pointer.
872 * Returns 0 if successful (some ioctls return postive numbers on
873 * success as well). Returns a negated errno value in case of error.
875 * Note: most ioctls are forward onto the block subsystem or further
876 * down in the scsi subsystem.
878 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
879 unsigned int cmd, unsigned long arg)
881 struct gendisk *disk = bdev->bd_disk;
882 struct scsi_device *sdp = scsi_disk(disk)->device;
883 void __user *p = (void __user *)arg;
886 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
887 disk->disk_name, cmd));
890 * If we are in the middle of error recovery, don't let anyone
891 * else try and use this device. Also, if error recovery fails, it
892 * may try and take the device offline, in which case all further
893 * access to the device is prohibited.
895 error = scsi_nonblockable_ioctl(sdp, cmd, p,
896 (mode & FMODE_NDELAY) != 0);
897 if (!scsi_block_when_processing_errors(sdp) || !error)
901 * Send SCSI addressing ioctls directly to mid level, send other
902 * ioctls to block level and then onto mid level if they can't be
906 case SCSI_IOCTL_GET_IDLUN:
907 case SCSI_IOCTL_GET_BUS_NUMBER:
908 return scsi_ioctl(sdp, cmd, p);
910 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
911 if (error != -ENOTTY)
914 return scsi_ioctl(sdp, cmd, p);
917 static void set_media_not_present(struct scsi_disk *sdkp)
919 sdkp->media_present = 0;
921 sdkp->device->changed = 1;
925 * sd_media_changed - check if our medium changed
926 * @disk: kernel device descriptor
928 * Returns 0 if not applicable or no change; 1 if change
930 * Note: this function is invoked from the block subsystem.
932 static int sd_media_changed(struct gendisk *disk)
934 struct scsi_disk *sdkp = scsi_disk(disk);
935 struct scsi_device *sdp = sdkp->device;
936 struct scsi_sense_hdr *sshdr = NULL;
939 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
945 * If the device is offline, don't send any commands - just pretend as
946 * if the command failed. If the device ever comes back online, we
947 * can deal with it then. It is only because of unrecoverable errors
948 * that we would ever take a device offline in the first place.
950 if (!scsi_device_online(sdp)) {
951 set_media_not_present(sdkp);
957 * Using TEST_UNIT_READY enables differentiation between drive with
958 * no cartridge loaded - NOT READY, drive with changed cartridge -
959 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
961 * Drives that auto spin down. eg iomega jaz 1G, will be started
962 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
963 * sd_revalidate() is called.
967 if (scsi_block_when_processing_errors(sdp)) {
968 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
969 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
974 * Unable to test, unit probably not ready. This usually
975 * means there is no disc in the drive. Mark as changed,
976 * and we will figure it out later once the drive is
979 if (retval || (scsi_sense_valid(sshdr) &&
980 /* 0x3a is medium not present */
981 sshdr->asc == 0x3a)) {
982 set_media_not_present(sdkp);
988 * For removable scsi disk we have to recognise the presence
989 * of a disk in the drive. This is kept in the struct scsi_disk
990 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
992 sdkp->media_present = 1;
994 retval = sdp->changed;
997 if (retval != sdkp->previous_state)
998 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
999 sdkp->previous_state = retval;
1004 static int sd_sync_cache(struct scsi_disk *sdkp)
1007 struct scsi_device *sdp = sdkp->device;
1008 struct scsi_sense_hdr sshdr;
1010 if (!scsi_device_online(sdp))
1014 for (retries = 3; retries > 0; --retries) {
1015 unsigned char cmd[10] = { 0 };
1017 cmd[0] = SYNCHRONIZE_CACHE;
1019 * Leave the rest of the command zero to indicate
1022 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1023 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1029 sd_print_result(sdkp, res);
1030 if (driver_byte(res) & DRIVER_SENSE)
1031 sd_print_sense_hdr(sdkp, &sshdr);
1039 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
1041 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1042 rq->timeout = SD_TIMEOUT;
1043 rq->cmd[0] = SYNCHRONIZE_CACHE;
1047 static void sd_rescan(struct device *dev)
1049 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1052 revalidate_disk(sdkp->disk);
1053 scsi_disk_put(sdkp);
1058 #ifdef CONFIG_COMPAT
1060 * This gets directly called from VFS. When the ioctl
1061 * is not recognized we go back to the other translation paths.
1063 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1064 unsigned int cmd, unsigned long arg)
1066 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1069 * If we are in the middle of error recovery, don't let anyone
1070 * else try and use this device. Also, if error recovery fails, it
1071 * may try and take the device offline, in which case all further
1072 * access to the device is prohibited.
1074 if (!scsi_block_when_processing_errors(sdev))
1077 if (sdev->host->hostt->compat_ioctl) {
1080 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1086 * Let the static ioctl translation table take care of it.
1088 return -ENOIOCTLCMD;
1092 static const struct block_device_operations sd_fops = {
1093 .owner = THIS_MODULE,
1095 .release = sd_release,
1096 .locked_ioctl = sd_ioctl,
1097 .getgeo = sd_getgeo,
1098 #ifdef CONFIG_COMPAT
1099 .compat_ioctl = sd_compat_ioctl,
1101 .media_changed = sd_media_changed,
1102 .revalidate_disk = sd_revalidate_disk,
1105 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1107 u64 start_lba = blk_rq_pos(scmd->request);
1108 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1112 if (!blk_fs_request(scmd->request))
1115 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1116 SCSI_SENSE_BUFFERSIZE,
1121 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1124 if (scmd->device->sector_size < 512) {
1125 /* only legitimate sector_size here is 256 */
1129 /* be careful ... don't want any overflows */
1130 u64 factor = scmd->device->sector_size / 512;
1131 do_div(start_lba, factor);
1132 do_div(end_lba, factor);
1135 /* The bad lba was reported incorrectly, we have no idea where
1138 if (bad_lba < start_lba || bad_lba >= end_lba)
1141 /* This computation should always be done in terms of
1142 * the resolution of the device's medium.
1144 return (bad_lba - start_lba) * scmd->device->sector_size;
1148 * sd_done - bottom half handler: called when the lower level
1149 * driver has completed (successfully or otherwise) a scsi command.
1150 * @SCpnt: mid-level's per command structure.
1152 * Note: potentially run from within an ISR. Must not block.
1154 static int sd_done(struct scsi_cmnd *SCpnt)
1156 int result = SCpnt->result;
1157 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1158 struct scsi_sense_hdr sshdr;
1159 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1160 int sense_valid = 0;
1161 int sense_deferred = 0;
1164 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1166 sense_deferred = scsi_sense_is_deferred(&sshdr);
1168 #ifdef CONFIG_SCSI_LOGGING
1169 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1171 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1172 "sd_done: sb[respc,sk,asc,"
1173 "ascq]=%x,%x,%x,%x\n",
1174 sshdr.response_code,
1175 sshdr.sense_key, sshdr.asc,
1179 if (driver_byte(result) != DRIVER_SENSE &&
1180 (!sense_valid || sense_deferred))
1183 switch (sshdr.sense_key) {
1184 case HARDWARE_ERROR:
1186 good_bytes = sd_completed_bytes(SCpnt);
1188 case RECOVERED_ERROR:
1189 good_bytes = scsi_bufflen(SCpnt);
1192 /* This indicates a false check condition, so ignore it. An
1193 * unknown amount of data was transferred so treat it as an
1196 scsi_print_sense("sd", SCpnt);
1198 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1200 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1201 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1202 if (sshdr.asc == 0x10)
1203 good_bytes = sd_completed_bytes(SCpnt);
1209 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1210 sd_dif_complete(SCpnt, good_bytes);
1212 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1213 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1215 /* We have to print a failed command here as the
1216 * extended CDB gets freed before scsi_io_completion()
1220 scsi_print_command(SCpnt);
1222 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1230 static int media_not_present(struct scsi_disk *sdkp,
1231 struct scsi_sense_hdr *sshdr)
1234 if (!scsi_sense_valid(sshdr))
1236 /* not invoked for commands that could return deferred errors */
1237 if (sshdr->sense_key != NOT_READY &&
1238 sshdr->sense_key != UNIT_ATTENTION)
1240 if (sshdr->asc != 0x3A) /* medium not present */
1243 set_media_not_present(sdkp);
1248 * spinup disk - called only in sd_revalidate_disk()
1251 sd_spinup_disk(struct scsi_disk *sdkp)
1253 unsigned char cmd[10];
1254 unsigned long spintime_expire = 0;
1255 int retries, spintime;
1256 unsigned int the_result;
1257 struct scsi_sense_hdr sshdr;
1258 int sense_valid = 0;
1262 /* Spin up drives, as required. Only do this at boot time */
1263 /* Spinup needs to be done for module loads too. */
1268 cmd[0] = TEST_UNIT_READY;
1269 memset((void *) &cmd[1], 0, 9);
1271 the_result = scsi_execute_req(sdkp->device, cmd,
1274 SD_MAX_RETRIES, NULL);
1277 * If the drive has indicated to us that it
1278 * doesn't have any media in it, don't bother
1279 * with any more polling.
1281 if (media_not_present(sdkp, &sshdr))
1285 sense_valid = scsi_sense_valid(&sshdr);
1287 } while (retries < 3 &&
1288 (!scsi_status_is_good(the_result) ||
1289 ((driver_byte(the_result) & DRIVER_SENSE) &&
1290 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1292 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1293 /* no sense, TUR either succeeded or failed
1294 * with a status error */
1295 if(!spintime && !scsi_status_is_good(the_result)) {
1296 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1297 sd_print_result(sdkp, the_result);
1303 * The device does not want the automatic start to be issued.
1305 if (sdkp->device->no_start_on_add)
1308 if (sense_valid && sshdr.sense_key == NOT_READY) {
1309 if (sshdr.asc == 4 && sshdr.ascq == 3)
1310 break; /* manual intervention required */
1311 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1312 break; /* standby */
1313 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1314 break; /* unavailable */
1316 * Issue command to spin up drive when not ready
1319 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1320 cmd[0] = START_STOP;
1321 cmd[1] = 1; /* Return immediately */
1322 memset((void *) &cmd[2], 0, 8);
1323 cmd[4] = 1; /* Start spin cycle */
1324 if (sdkp->device->start_stop_pwr_cond)
1326 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1328 SD_TIMEOUT, SD_MAX_RETRIES,
1330 spintime_expire = jiffies + 100 * HZ;
1333 /* Wait 1 second for next try */
1338 * Wait for USB flash devices with slow firmware.
1339 * Yes, this sense key/ASC combination shouldn't
1340 * occur here. It's characteristic of these devices.
1342 } else if (sense_valid &&
1343 sshdr.sense_key == UNIT_ATTENTION &&
1344 sshdr.asc == 0x28) {
1346 spintime_expire = jiffies + 5 * HZ;
1349 /* Wait 1 second for next try */
1352 /* we don't understand the sense code, so it's
1353 * probably pointless to loop */
1355 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1356 sd_print_sense_hdr(sdkp, &sshdr);
1361 } while (spintime && time_before_eq(jiffies, spintime_expire));
1364 if (scsi_status_is_good(the_result))
1367 printk("not responding...\n");
1373 * Determine whether disk supports Data Integrity Field.
1375 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1377 struct scsi_device *sdp = sdkp->device;
1380 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1383 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1385 if (type == sdkp->protection_type || !sdkp->first_scan)
1388 sdkp->protection_type = type;
1390 if (type > SD_DIF_TYPE3_PROTECTION) {
1391 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1392 "protection type %u. Disabling disk!\n", type);
1397 if (scsi_host_dif_capable(sdp->host, type))
1398 sd_printk(KERN_NOTICE, sdkp,
1399 "Enabling DIF Type %u protection\n", type);
1401 sd_printk(KERN_NOTICE, sdkp,
1402 "Disabling DIF Type %u protection\n", type);
1405 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1406 struct scsi_sense_hdr *sshdr, int sense_valid,
1409 sd_print_result(sdkp, the_result);
1410 if (driver_byte(the_result) & DRIVER_SENSE)
1411 sd_print_sense_hdr(sdkp, sshdr);
1413 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1416 * Set dirty bit for removable devices if not ready -
1417 * sometimes drives will not report this properly.
1419 if (sdp->removable &&
1420 sense_valid && sshdr->sense_key == NOT_READY)
1424 * We used to set media_present to 0 here to indicate no media
1425 * in the drive, but some drives fail read capacity even with
1426 * media present, so we can't do that.
1428 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1432 #if RC16_LEN > SD_BUF_SIZE
1433 #error RC16_LEN must not be more than SD_BUF_SIZE
1436 #define READ_CAPACITY_RETRIES_ON_RESET 10
1438 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1439 unsigned char *buffer)
1441 unsigned char cmd[16];
1442 struct scsi_sense_hdr sshdr;
1443 int sense_valid = 0;
1445 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1446 unsigned int alignment;
1447 unsigned long long lba;
1448 unsigned sector_size;
1452 cmd[0] = SERVICE_ACTION_IN;
1453 cmd[1] = SAI_READ_CAPACITY_16;
1455 memset(buffer, 0, RC16_LEN);
1457 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1458 buffer, RC16_LEN, &sshdr,
1459 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1461 if (media_not_present(sdkp, &sshdr))
1465 sense_valid = scsi_sense_valid(&sshdr);
1467 sshdr.sense_key == ILLEGAL_REQUEST &&
1468 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1470 /* Invalid Command Operation Code or
1471 * Invalid Field in CDB, just retry
1472 * silently with RC10 */
1475 sshdr.sense_key == UNIT_ATTENTION &&
1476 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1477 /* Device reset might occur several times,
1478 * give it one more chance */
1479 if (--reset_retries > 0)
1484 } while (the_result && retries);
1487 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1488 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1492 sector_size = get_unaligned_be32(&buffer[8]);
1493 lba = get_unaligned_be64(&buffer[0]);
1495 sd_read_protection_type(sdkp, buffer);
1497 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1498 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1499 "kernel compiled with support for large block "
1505 /* Logical blocks per physical block exponent */
1506 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1508 /* Lowest aligned logical block */
1509 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1510 blk_queue_alignment_offset(sdp->request_queue, alignment);
1511 if (alignment && sdkp->first_scan)
1512 sd_printk(KERN_NOTICE, sdkp,
1513 "physical block alignment offset: %u\n", alignment);
1515 if (buffer[14] & 0x80) { /* TPE */
1516 struct request_queue *q = sdp->request_queue;
1518 sdkp->thin_provisioning = 1;
1519 q->limits.discard_granularity = sdkp->hw_sector_size;
1520 q->limits.max_discard_sectors = 0xffffffff;
1522 if (buffer[14] & 0x40) /* TPRZ */
1523 q->limits.discard_zeroes_data = 1;
1525 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1528 sdkp->capacity = lba + 1;
1532 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1533 unsigned char *buffer)
1535 unsigned char cmd[16];
1536 struct scsi_sense_hdr sshdr;
1537 int sense_valid = 0;
1539 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1541 unsigned sector_size;
1544 cmd[0] = READ_CAPACITY;
1545 memset(&cmd[1], 0, 9);
1546 memset(buffer, 0, 8);
1548 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1550 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1552 if (media_not_present(sdkp, &sshdr))
1556 sense_valid = scsi_sense_valid(&sshdr);
1558 sshdr.sense_key == UNIT_ATTENTION &&
1559 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1560 /* Device reset might occur several times,
1561 * give it one more chance */
1562 if (--reset_retries > 0)
1567 } while (the_result && retries);
1570 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1571 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1575 sector_size = get_unaligned_be32(&buffer[4]);
1576 lba = get_unaligned_be32(&buffer[0]);
1578 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1579 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1580 "kernel compiled with support for large block "
1586 sdkp->capacity = lba + 1;
1587 sdkp->hw_sector_size = sector_size;
1591 static int sd_try_rc16_first(struct scsi_device *sdp)
1593 if (sdp->host->max_cmd_len < 16)
1595 if (sdp->scsi_level > SCSI_SPC_2)
1597 if (scsi_device_protection(sdp))
1603 * read disk capacity
1606 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1609 struct scsi_device *sdp = sdkp->device;
1610 sector_t old_capacity = sdkp->capacity;
1612 if (sd_try_rc16_first(sdp)) {
1613 sector_size = read_capacity_16(sdkp, sdp, buffer);
1614 if (sector_size == -EOVERFLOW)
1616 if (sector_size == -ENODEV)
1618 if (sector_size < 0)
1619 sector_size = read_capacity_10(sdkp, sdp, buffer);
1620 if (sector_size < 0)
1623 sector_size = read_capacity_10(sdkp, sdp, buffer);
1624 if (sector_size == -EOVERFLOW)
1626 if (sector_size < 0)
1628 if ((sizeof(sdkp->capacity) > 4) &&
1629 (sdkp->capacity > 0xffffffffULL)) {
1630 int old_sector_size = sector_size;
1631 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1632 "Trying to use READ CAPACITY(16).\n");
1633 sector_size = read_capacity_16(sdkp, sdp, buffer);
1634 if (sector_size < 0) {
1635 sd_printk(KERN_NOTICE, sdkp,
1636 "Using 0xffffffff as device size\n");
1637 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1638 sector_size = old_sector_size;
1644 /* Some devices are known to return the total number of blocks,
1645 * not the highest block number. Some devices have versions
1646 * which do this and others which do not. Some devices we might
1647 * suspect of doing this but we don't know for certain.
1649 * If we know the reported capacity is wrong, decrement it. If
1650 * we can only guess, then assume the number of blocks is even
1651 * (usually true but not always) and err on the side of lowering
1654 if (sdp->fix_capacity ||
1655 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1656 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1657 "from its reported value: %llu\n",
1658 (unsigned long long) sdkp->capacity);
1663 if (sector_size == 0) {
1665 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1669 if (sector_size != 512 &&
1670 sector_size != 1024 &&
1671 sector_size != 2048 &&
1672 sector_size != 4096 &&
1673 sector_size != 256) {
1674 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1677 * The user might want to re-format the drive with
1678 * a supported sectorsize. Once this happens, it
1679 * would be relatively trivial to set the thing up.
1680 * For this reason, we leave the thing in the table.
1684 * set a bogus sector size so the normal read/write
1685 * logic in the block layer will eventually refuse any
1686 * request on this device without tripping over power
1687 * of two sector size assumptions
1691 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1694 char cap_str_2[10], cap_str_10[10];
1695 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1697 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1699 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1700 sizeof(cap_str_10));
1702 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1703 sd_printk(KERN_NOTICE, sdkp,
1704 "%llu %d-byte logical blocks: (%s/%s)\n",
1705 (unsigned long long)sdkp->capacity,
1706 sector_size, cap_str_10, cap_str_2);
1708 if (sdkp->hw_sector_size != sector_size)
1709 sd_printk(KERN_NOTICE, sdkp,
1710 "%u-byte physical blocks\n",
1711 sdkp->hw_sector_size);
1715 /* Rescale capacity to 512-byte units */
1716 if (sector_size == 4096)
1717 sdkp->capacity <<= 3;
1718 else if (sector_size == 2048)
1719 sdkp->capacity <<= 2;
1720 else if (sector_size == 1024)
1721 sdkp->capacity <<= 1;
1722 else if (sector_size == 256)
1723 sdkp->capacity >>= 1;
1725 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1726 sdkp->device->sector_size = sector_size;
1729 /* called with buffer of length 512 */
1731 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1732 unsigned char *buffer, int len, struct scsi_mode_data *data,
1733 struct scsi_sense_hdr *sshdr)
1735 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1736 SD_TIMEOUT, SD_MAX_RETRIES, data,
1741 * read write protect setting, if possible - called only in sd_revalidate_disk()
1742 * called with buffer of length SD_BUF_SIZE
1745 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1748 struct scsi_device *sdp = sdkp->device;
1749 struct scsi_mode_data data;
1750 int old_wp = sdkp->write_prot;
1752 set_disk_ro(sdkp->disk, 0);
1753 if (sdp->skip_ms_page_3f) {
1754 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1758 if (sdp->use_192_bytes_for_3f) {
1759 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1762 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1763 * We have to start carefully: some devices hang if we ask
1764 * for more than is available.
1766 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1769 * Second attempt: ask for page 0 When only page 0 is
1770 * implemented, a request for page 3F may return Sense Key
1771 * 5: Illegal Request, Sense Code 24: Invalid field in
1774 if (!scsi_status_is_good(res))
1775 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1778 * Third attempt: ask 255 bytes, as we did earlier.
1780 if (!scsi_status_is_good(res))
1781 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1785 if (!scsi_status_is_good(res)) {
1786 sd_printk(KERN_WARNING, sdkp,
1787 "Test WP failed, assume Write Enabled\n");
1789 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1790 set_disk_ro(sdkp->disk, sdkp->write_prot);
1791 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1792 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1793 sdkp->write_prot ? "on" : "off");
1794 sd_printk(KERN_DEBUG, sdkp,
1795 "Mode Sense: %02x %02x %02x %02x\n",
1796 buffer[0], buffer[1], buffer[2], buffer[3]);
1802 * sd_read_cache_type - called only from sd_revalidate_disk()
1803 * called with buffer of length SD_BUF_SIZE
1806 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1809 struct scsi_device *sdp = sdkp->device;
1813 struct scsi_mode_data data;
1814 struct scsi_sense_hdr sshdr;
1815 int old_wce = sdkp->WCE;
1816 int old_rcd = sdkp->RCD;
1817 int old_dpofua = sdkp->DPOFUA;
1819 if (sdp->skip_ms_page_8)
1822 if (sdp->type == TYPE_RBC) {
1830 /* cautiously ask */
1831 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1833 if (!scsi_status_is_good(res))
1836 if (!data.header_length) {
1838 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1841 /* that went OK, now ask for the proper length */
1845 * We're only interested in the first three bytes, actually.
1846 * But the data cache page is defined for the first 20.
1853 /* Take headers and block descriptors into account */
1854 len += data.header_length + data.block_descriptor_length;
1855 if (len > SD_BUF_SIZE)
1859 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1861 if (scsi_status_is_good(res)) {
1862 int offset = data.header_length + data.block_descriptor_length;
1864 if (offset >= SD_BUF_SIZE - 2) {
1865 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1869 if ((buffer[offset] & 0x3f) != modepage) {
1870 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1874 if (modepage == 8) {
1875 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1876 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1878 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1882 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1883 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1884 sd_printk(KERN_NOTICE, sdkp,
1885 "Uses READ/WRITE(6), disabling FUA\n");
1889 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1890 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1891 sd_printk(KERN_NOTICE, sdkp,
1892 "Write cache: %s, read cache: %s, %s\n",
1893 sdkp->WCE ? "enabled" : "disabled",
1894 sdkp->RCD ? "disabled" : "enabled",
1895 sdkp->DPOFUA ? "supports DPO and FUA"
1896 : "doesn't support DPO or FUA");
1902 if (scsi_sense_valid(&sshdr) &&
1903 sshdr.sense_key == ILLEGAL_REQUEST &&
1904 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1905 /* Invalid field in CDB */
1906 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1908 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1911 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1918 * The ATO bit indicates whether the DIF application tag is available
1919 * for use by the operating system.
1921 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1924 struct scsi_device *sdp = sdkp->device;
1925 struct scsi_mode_data data;
1926 struct scsi_sense_hdr sshdr;
1928 if (sdp->type != TYPE_DISK)
1931 if (sdkp->protection_type == 0)
1934 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1935 SD_MAX_RETRIES, &data, &sshdr);
1937 if (!scsi_status_is_good(res) || !data.header_length ||
1939 sd_printk(KERN_WARNING, sdkp,
1940 "getting Control mode page failed, assume no ATO\n");
1942 if (scsi_sense_valid(&sshdr))
1943 sd_print_sense_hdr(sdkp, &sshdr);
1948 offset = data.header_length + data.block_descriptor_length;
1950 if ((buffer[offset] & 0x3f) != 0x0a) {
1951 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1955 if ((buffer[offset + 5] & 0x80) == 0)
1964 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1965 * @disk: disk to query
1967 static void sd_read_block_limits(struct scsi_disk *sdkp)
1969 struct request_queue *q = sdkp->disk->queue;
1970 unsigned int sector_sz = sdkp->device->sector_size;
1971 const int vpd_len = 64;
1972 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
1975 /* Block Limits VPD */
1976 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
1979 blk_queue_io_min(sdkp->disk->queue,
1980 get_unaligned_be16(&buffer[6]) * sector_sz);
1981 blk_queue_io_opt(sdkp->disk->queue,
1982 get_unaligned_be32(&buffer[12]) * sector_sz);
1984 /* Thin provisioning enabled and page length indicates TP support */
1985 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
1986 unsigned int lba_count, desc_count, granularity;
1988 lba_count = get_unaligned_be32(&buffer[20]);
1989 desc_count = get_unaligned_be32(&buffer[24]);
1992 q->limits.max_discard_sectors =
1993 lba_count * sector_sz >> 9;
1999 granularity = get_unaligned_be32(&buffer[28]);
2002 q->limits.discard_granularity = granularity * sector_sz;
2004 if (buffer[32] & 0x80)
2005 q->limits.discard_alignment =
2006 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2014 * sd_read_block_characteristics - Query block dev. characteristics
2015 * @disk: disk to query
2017 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2019 unsigned char *buffer;
2021 const int vpd_len = 64;
2023 buffer = kmalloc(vpd_len, GFP_KERNEL);
2026 /* Block Device Characteristics VPD */
2027 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2030 rot = get_unaligned_be16(&buffer[4]);
2033 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2039 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2042 * Although VPD inquiries can go to SCSI-2 type devices,
2043 * some USB ones crash on receiving them, and the pages
2044 * we currently ask for are for SPC-3 and beyond
2046 if (sdp->scsi_level > SCSI_SPC_2)
2052 * sd_revalidate_disk - called the first time a new disk is seen,
2053 * performs disk spin up, read_capacity, etc.
2054 * @disk: struct gendisk we care about
2056 static int sd_revalidate_disk(struct gendisk *disk)
2058 struct scsi_disk *sdkp = scsi_disk(disk);
2059 struct scsi_device *sdp = sdkp->device;
2060 unsigned char *buffer;
2063 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2064 "sd_revalidate_disk\n"));
2067 * If the device is offline, don't try and read capacity or any
2068 * of the other niceties.
2070 if (!scsi_device_online(sdp))
2073 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2075 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2076 "allocation failure.\n");
2080 sd_spinup_disk(sdkp);
2083 * Without media there is no reason to ask; moreover, some devices
2084 * react badly if we do.
2086 if (sdkp->media_present) {
2087 sd_read_capacity(sdkp, buffer);
2089 if (sd_try_extended_inquiry(sdp)) {
2090 sd_read_block_limits(sdkp);
2091 sd_read_block_characteristics(sdkp);
2094 sd_read_write_protect_flag(sdkp, buffer);
2095 sd_read_cache_type(sdkp, buffer);
2096 sd_read_app_tag_own(sdkp, buffer);
2099 sdkp->first_scan = 0;
2102 * We now have all cache related info, determine how we deal
2103 * with ordered requests. Note that as the current SCSI
2104 * dispatch function can alter request order, we cannot use
2105 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2108 ordered = sdkp->DPOFUA
2109 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2111 ordered = QUEUE_ORDERED_DRAIN;
2113 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
2115 set_capacity(disk, sdkp->capacity);
2123 * sd_format_disk_name - format disk name
2124 * @prefix: name prefix - ie. "sd" for SCSI disks
2125 * @index: index of the disk to format name for
2126 * @buf: output buffer
2127 * @buflen: length of the output buffer
2129 * SCSI disk names starts at sda. The 26th device is sdz and the
2130 * 27th is sdaa. The last one for two lettered suffix is sdzz
2131 * which is followed by sdaaa.
2133 * This is basically 26 base counting with one extra 'nil' entry
2134 * at the beginning from the second digit on and can be
2135 * determined using similar method as 26 base conversion with the
2136 * index shifted -1 after each digit is computed.
2142 * 0 on success, -errno on failure.
2144 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2146 const int base = 'z' - 'a' + 1;
2147 char *begin = buf + strlen(prefix);
2148 char *end = buf + buflen;
2158 *--p = 'a' + (index % unit);
2159 index = (index / unit) - 1;
2160 } while (index >= 0);
2162 memmove(begin, p, end - p);
2163 memcpy(buf, prefix, strlen(prefix));
2169 * The asynchronous part of sd_probe
2171 static void sd_probe_async(void *data, async_cookie_t cookie)
2173 struct scsi_disk *sdkp = data;
2174 struct scsi_device *sdp;
2181 index = sdkp->index;
2182 dev = &sdp->sdev_gendev;
2184 if (index < SD_MAX_DISKS) {
2185 gd->major = sd_major((index & 0xf0) >> 4);
2186 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2187 gd->minors = SD_MINORS;
2189 gd->fops = &sd_fops;
2190 gd->private_data = &sdkp->driver;
2191 gd->queue = sdkp->device->request_queue;
2193 /* defaults, until the device tells us otherwise */
2194 sdp->sector_size = 512;
2196 sdkp->media_present = 1;
2197 sdkp->write_prot = 0;
2201 sdkp->first_scan = 1;
2203 sd_revalidate_disk(gd);
2205 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2207 gd->driverfs_dev = &sdp->sdev_gendev;
2208 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
2210 gd->flags |= GENHD_FL_REMOVABLE;
2212 dev_set_drvdata(dev, sdkp);
2214 sd_dif_config_host(sdkp);
2216 sd_revalidate_disk(gd);
2218 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2219 sdp->removable ? "removable " : "");
2220 put_device(&sdkp->dev);
2224 * sd_probe - called during driver initialization and whenever a
2225 * new scsi device is attached to the system. It is called once
2226 * for each scsi device (not just disks) present.
2227 * @dev: pointer to device object
2229 * Returns 0 if successful (or not interested in this scsi device
2230 * (e.g. scanner)); 1 when there is an error.
2232 * Note: this function is invoked from the scsi mid-level.
2233 * This function sets up the mapping between a given
2234 * <host,channel,id,lun> (found in sdp) and new device name
2235 * (e.g. /dev/sda). More precisely it is the block device major
2236 * and minor number that is chosen here.
2238 * Assume sd_attach is not re-entrant (for time being)
2239 * Also think about sd_attach() and sd_remove() running coincidentally.
2241 static int sd_probe(struct device *dev)
2243 struct scsi_device *sdp = to_scsi_device(dev);
2244 struct scsi_disk *sdkp;
2250 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2253 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2257 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2261 gd = alloc_disk(SD_MINORS);
2266 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2269 spin_lock(&sd_index_lock);
2270 error = ida_get_new(&sd_index_ida, &index);
2271 spin_unlock(&sd_index_lock);
2272 } while (error == -EAGAIN);
2277 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2279 goto out_free_index;
2282 sdkp->driver = &sd_template;
2284 sdkp->index = index;
2286 sdkp->previous_state = 1;
2288 if (!sdp->request_queue->rq_timeout) {
2289 if (sdp->type != TYPE_MOD)
2290 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2292 blk_queue_rq_timeout(sdp->request_queue,
2296 device_initialize(&sdkp->dev);
2297 sdkp->dev.parent = &sdp->sdev_gendev;
2298 sdkp->dev.class = &sd_disk_class;
2299 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2301 if (device_add(&sdkp->dev))
2302 goto out_free_index;
2304 get_device(&sdp->sdev_gendev);
2306 get_device(&sdkp->dev); /* prevent release before async_schedule */
2307 async_schedule(sd_probe_async, sdkp);
2312 spin_lock(&sd_index_lock);
2313 ida_remove(&sd_index_ida, index);
2314 spin_unlock(&sd_index_lock);
2324 * sd_remove - called whenever a scsi disk (previously recognized by
2325 * sd_probe) is detached from the system. It is called (potentially
2326 * multiple times) during sd module unload.
2327 * @sdp: pointer to mid level scsi device object
2329 * Note: this function is invoked from the scsi mid-level.
2330 * This function potentially frees up a device name (e.g. /dev/sdc)
2331 * that could be re-used by a subsequent sd_probe().
2332 * This function is not called when the built-in sd driver is "exit-ed".
2334 static int sd_remove(struct device *dev)
2336 struct scsi_disk *sdkp;
2338 async_synchronize_full();
2339 sdkp = dev_get_drvdata(dev);
2340 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2341 device_del(&sdkp->dev);
2342 del_gendisk(sdkp->disk);
2345 mutex_lock(&sd_ref_mutex);
2346 dev_set_drvdata(dev, NULL);
2347 put_device(&sdkp->dev);
2348 mutex_unlock(&sd_ref_mutex);
2354 * scsi_disk_release - Called to free the scsi_disk structure
2355 * @dev: pointer to embedded class device
2357 * sd_ref_mutex must be held entering this routine. Because it is
2358 * called on last put, you should always use the scsi_disk_get()
2359 * scsi_disk_put() helpers which manipulate the semaphore directly
2360 * and never do a direct put_device.
2362 static void scsi_disk_release(struct device *dev)
2364 struct scsi_disk *sdkp = to_scsi_disk(dev);
2365 struct gendisk *disk = sdkp->disk;
2367 spin_lock(&sd_index_lock);
2368 ida_remove(&sd_index_ida, sdkp->index);
2369 spin_unlock(&sd_index_lock);
2371 disk->private_data = NULL;
2373 put_device(&sdkp->device->sdev_gendev);
2378 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2380 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2381 struct scsi_sense_hdr sshdr;
2382 struct scsi_device *sdp = sdkp->device;
2386 cmd[4] |= 1; /* START */
2388 if (sdp->start_stop_pwr_cond)
2389 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2391 if (!scsi_device_online(sdp))
2394 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2395 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2397 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2398 sd_print_result(sdkp, res);
2399 if (driver_byte(res) & DRIVER_SENSE)
2400 sd_print_sense_hdr(sdkp, &sshdr);
2407 * Send a SYNCHRONIZE CACHE instruction down to the device through
2408 * the normal SCSI command structure. Wait for the command to
2411 static void sd_shutdown(struct device *dev)
2413 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2416 return; /* this can happen */
2419 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2420 sd_sync_cache(sdkp);
2423 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2424 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2425 sd_start_stop_device(sdkp, 0);
2428 scsi_disk_put(sdkp);
2431 static int sd_suspend(struct device *dev, pm_message_t mesg)
2433 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2437 return 0; /* this can happen */
2440 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2441 ret = sd_sync_cache(sdkp);
2446 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2447 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2448 ret = sd_start_stop_device(sdkp, 0);
2452 scsi_disk_put(sdkp);
2456 static int sd_resume(struct device *dev)
2458 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2461 if (!sdkp->device->manage_start_stop)
2464 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2465 ret = sd_start_stop_device(sdkp, 1);
2468 scsi_disk_put(sdkp);
2473 * init_sd - entry point for this driver (both when built in or when
2476 * Note: this function registers this driver with the scsi mid-level.
2478 static int __init init_sd(void)
2480 int majors = 0, i, err;
2482 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2484 for (i = 0; i < SD_MAJORS; i++)
2485 if (register_blkdev(sd_major(i), "sd") == 0)
2491 err = class_register(&sd_disk_class);
2495 err = scsi_register_driver(&sd_template.gendrv);
2499 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2501 if (!sd_cdb_cache) {
2502 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2506 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2508 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2515 kmem_cache_destroy(sd_cdb_cache);
2518 class_unregister(&sd_disk_class);
2520 for (i = 0; i < SD_MAJORS; i++)
2521 unregister_blkdev(sd_major(i), "sd");
2526 * exit_sd - exit point for this driver (when it is a module).
2528 * Note: this function unregisters this driver from the scsi mid-level.
2530 static void __exit exit_sd(void)
2534 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2536 mempool_destroy(sd_cdb_pool);
2537 kmem_cache_destroy(sd_cdb_cache);
2539 scsi_unregister_driver(&sd_template.gendrv);
2540 class_unregister(&sd_disk_class);
2542 for (i = 0; i < SD_MAJORS; i++)
2543 unregister_blkdev(sd_major(i), "sd");
2546 module_init(init_sd);
2547 module_exit(exit_sd);
2549 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2550 struct scsi_sense_hdr *sshdr)
2552 sd_printk(KERN_INFO, sdkp, "");
2553 scsi_show_sense_hdr(sshdr);
2554 sd_printk(KERN_INFO, sdkp, "");
2555 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2558 static void sd_print_result(struct scsi_disk *sdkp, int result)
2560 sd_printk(KERN_INFO, sdkp, "");
2561 scsi_show_result(result);