ALSA: hda - Add quirk for Dell Vostro 1220
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / sd.c
blobde6c60320f6ffb70f1b9d00a1677f1f36caabba0
1 /*
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>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.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>
66 #include "sd.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)
94 #define SD_MINORS 16
95 #else
96 #define SD_MINORS 0
97 #endif
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)"
128 static ssize_t
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;
135 char buffer[64];
136 char *buffer_data;
137 struct scsi_mode_data data;
138 struct scsi_sense_hdr sshdr;
139 int len;
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 */
145 return -EINVAL;
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 &&
150 buf[len] == '\n') {
151 ct = i;
152 break;
155 if (ct < 0)
156 return -EINVAL;
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))
161 return -EINVAL;
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);
174 return -EINVAL;
176 revalidate_disk(sdkp->disk);
177 return count;
180 static ssize_t
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))
188 return -EACCES;
190 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
192 return count;
195 static ssize_t
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))
203 return -EACCES;
205 if (sdp->type != TYPE_DISK)
206 return -EINVAL;
208 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
210 return count;
213 static ssize_t
214 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
215 char *buf)
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]);
223 static ssize_t
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);
231 static ssize_t
232 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
233 char *buf)
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);
241 static ssize_t
242 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
243 char *buf)
245 struct scsi_disk *sdkp = to_scsi_disk(dev);
247 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250 static ssize_t
251 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
252 char *buf)
254 struct scsi_disk *sdkp = to_scsi_disk(dev);
256 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
259 static ssize_t
260 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
261 char *buf)
263 struct scsi_disk *sdkp = to_scsi_disk(dev);
265 return snprintf(buf, 20, "%u\n", sdkp->ATO);
268 static ssize_t
269 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
270 char *buf)
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),
288 __ATTR_NULL,
291 static struct class sd_disk_class = {
292 .name = "scsi_disk",
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,
300 .gendrv = {
301 .name = "sd",
302 .probe = sd_probe,
303 .remove = sd_remove,
304 .suspend = sd_suspend,
305 .resume = sd_resume,
306 .shutdown = sd_shutdown,
308 .rescan = sd_rescan,
309 .done = sd_done,
313 * Device no to disk mapping:
315 * major disc2 disc p1
316 * |............|.............|....|....| <- dev_t
317 * 31 20 19 8 7 4 3 0
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
322 * for major1, ...
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)
328 switch (major_idx) {
329 case 0:
330 return SCSI_DISK0_MAJOR;
331 case 1 ... 7:
332 return SCSI_DISK1_MAJOR + major_idx - 1;
333 case 8 ... 15:
334 return SCSI_DISK8_MAJOR + major_idx - 8;
335 default:
336 BUG();
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);
349 else
350 sdkp = NULL;
352 return sdkp;
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);
362 return sdkp;
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);
371 if (sdkp)
372 sdkp = __scsi_disk_get(sdkp->disk);
373 mutex_unlock(&sd_ref_mutex);
374 return sdkp;
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) {
393 if (dif && dix)
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;
399 } else {
400 if (dif && dix)
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) {
427 sector >>= 3;
428 num >>= 3;
431 rq->cmd_type = REQ_TYPE_BLOCK_PC;
432 rq->timeout = SD_TIMEOUT;
434 memset(rq->cmd, 0, rq->cmd_len);
436 if (sdkp->unmap) {
437 char *buf = kmap_atomic(bio_page(bio), KM_USER0);
439 rq->cmd[0] = UNMAP;
440 rq->cmd[8] = 24;
441 rq->cmd_len = 10;
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);
452 } else {
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]);
457 rq->cmd_len = 16;
460 return BLKPREP_OK;
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);
478 sector_t threshold;
479 unsigned int this_count = blk_rq_sectors(rq);
480 int ret, host_dif;
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);
492 goto out;
493 } else if (rq->cmd_type != REQ_TYPE_FS) {
494 ret = BLKPREP_KILL;
495 goto out;
497 ret = scsi_setup_fs_cmnd(sdp, rq);
498 if (ret != BLKPREP_OK)
499 goto out;
500 SCpnt = rq->special;
501 sdkp = scsi_disk(disk);
503 /* from here on until we're complete, any goto out
504 * is used for a killable error condition */
505 ret = BLKPREP_KILL;
507 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
508 "sd_init_command: block=%llu, "
509 "count=%d\n",
510 (unsigned long long)block,
511 this_count));
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));
520 goto out;
523 if (sdp->changed) {
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"); */
529 goto out;
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;
543 } else {
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
561 * for this.
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");
567 goto out;
568 } else {
569 block = block >> 1;
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");
577 goto out;
578 } else {
579 block = block >> 2;
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");
587 goto out;
588 } else {
589 block = block >> 3;
590 this_count = this_count >> 3;
593 if (rq_data_dir(rq) == WRITE) {
594 if (!sdp->writeable) {
595 goto out;
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)
602 goto out;
604 } else if (rq_data_dir(rq) == READ) {
605 SCpnt->cmnd[0] = READ_6;
606 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
607 } else {
608 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
609 goto out;
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);
620 if (host_dif)
621 protect = 1 << 5;
622 else
623 protect = 0;
625 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
626 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
628 if (unlikely(SCpnt->cmnd == NULL)) {
629 ret = BLKPREP_DEFER;
630 goto out;
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);
640 /* LBA */
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)
681 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;
692 } else {
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
698 * use_10_for_rw.
700 scmd_printk(KERN_ERR, SCpnt,
701 "FUA write on READ/WRITE(6) drive\n");
702 goto out;
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;
709 SCpnt->cmnd[5] = 0;
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
728 * queued.
730 ret = BLKPREP_OK;
731 out:
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
741 * of error.
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;
752 int retval;
754 if (!sdkp)
755 return -ENXIO;
757 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
759 sdev = sdkp->device;
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.
765 retval = -ENXIO;
766 if (!scsi_block_when_processing_errors(sdev))
767 goto error_out;
769 if (sdev->removable || sdkp->write_prot)
770 check_disk_change(bdev);
773 * If the drive is empty, just let the open fail.
775 retval = -ENOMEDIUM;
776 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
777 goto error_out;
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.
783 retval = -EROFS;
784 if (sdkp->write_prot && (mode & FMODE_WRITE))
785 goto error_out;
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.
793 retval = -ENXIO;
794 if (!scsi_device_online(sdev))
795 goto error_out;
797 if (!sdkp->openers++ && sdev->removable) {
798 if (scsi_block_when_processing_errors(sdev))
799 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
802 return 0;
804 error_out:
805 scsi_disk_put(sdkp);
806 return retval;
810 * sd_release - invoked when the (last) close(2) is called on this
811 * scsi disk.
812 * @inode: only i_rdev member may be used
813 * @filp: only f_mode and f_flags may be used
815 * Returns 0.
817 * Note: may block (uninterruptible) if error recovery is underway
818 * on this disk.
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"?
836 scsi_disk_put(sdkp);
837 return 0;
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;
845 int diskinfo[4];
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);
855 else
856 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
858 geo->heads = diskinfo[0];
859 geo->sectors = diskinfo[1];
860 geo->cylinders = diskinfo[2];
861 return 0;
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;
884 int error;
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)
898 return 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
903 * resolved.
905 switch (cmd) {
906 case SCSI_IOCTL_GET_IDLUN:
907 case SCSI_IOCTL_GET_BUS_NUMBER:
908 return scsi_ioctl(sdp, cmd, p);
909 default:
910 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
911 if (error != -ENOTTY)
912 return error;
914 return scsi_ioctl(sdp, cmd, p);
917 static void set_media_not_present(struct scsi_disk *sdkp)
919 sdkp->media_present = 0;
920 sdkp->capacity = 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;
937 int retval;
939 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
941 if (!sdp->removable)
942 return 0;
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);
952 retval = 1;
953 goto out;
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.
965 retval = -ENODEV;
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,
970 sshdr);
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
977 * available again.
979 if (retval || (scsi_sense_valid(sshdr) &&
980 /* 0x3a is medium not present */
981 sshdr->asc == 0x3a)) {
982 set_media_not_present(sdkp);
983 retval = 1;
984 goto out;
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;
995 sdp->changed = 0;
996 out:
997 if (retval != sdkp->previous_state)
998 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
999 sdkp->previous_state = retval;
1000 kfree(sshdr);
1001 return retval;
1004 static int sd_sync_cache(struct scsi_disk *sdkp)
1006 int retries, res;
1007 struct scsi_device *sdp = sdkp->device;
1008 struct scsi_sense_hdr sshdr;
1010 if (!scsi_device_online(sdp))
1011 return -ENODEV;
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
1020 * flush everything.
1022 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1023 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1024 if (res == 0)
1025 break;
1028 if (res) {
1029 sd_print_result(sdkp, res);
1030 if (driver_byte(res) & DRIVER_SENSE)
1031 sd_print_sense_hdr(sdkp, &sshdr);
1034 if (res)
1035 return -EIO;
1036 return 0;
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->retries = SD_MAX_RETRIES;
1044 rq->cmd[0] = SYNCHRONIZE_CACHE;
1045 rq->cmd_len = 10;
1048 static void sd_rescan(struct device *dev)
1050 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1052 if (sdkp) {
1053 revalidate_disk(sdkp->disk);
1054 scsi_disk_put(sdkp);
1059 #ifdef CONFIG_COMPAT
1061 * This gets directly called from VFS. When the ioctl
1062 * is not recognized we go back to the other translation paths.
1064 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1065 unsigned int cmd, unsigned long arg)
1067 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1070 * If we are in the middle of error recovery, don't let anyone
1071 * else try and use this device. Also, if error recovery fails, it
1072 * may try and take the device offline, in which case all further
1073 * access to the device is prohibited.
1075 if (!scsi_block_when_processing_errors(sdev))
1076 return -ENODEV;
1078 if (sdev->host->hostt->compat_ioctl) {
1079 int ret;
1081 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1083 return ret;
1087 * Let the static ioctl translation table take care of it.
1089 return -ENOIOCTLCMD;
1091 #endif
1093 static const struct block_device_operations sd_fops = {
1094 .owner = THIS_MODULE,
1095 .open = sd_open,
1096 .release = sd_release,
1097 .locked_ioctl = sd_ioctl,
1098 .getgeo = sd_getgeo,
1099 #ifdef CONFIG_COMPAT
1100 .compat_ioctl = sd_compat_ioctl,
1101 #endif
1102 .media_changed = sd_media_changed,
1103 .revalidate_disk = sd_revalidate_disk,
1106 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1108 u64 start_lba = blk_rq_pos(scmd->request);
1109 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1110 u64 bad_lba;
1111 int info_valid;
1113 if (!blk_fs_request(scmd->request))
1114 return 0;
1116 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1117 SCSI_SENSE_BUFFERSIZE,
1118 &bad_lba);
1119 if (!info_valid)
1120 return 0;
1122 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1123 return 0;
1125 if (scmd->device->sector_size < 512) {
1126 /* only legitimate sector_size here is 256 */
1127 start_lba <<= 1;
1128 end_lba <<= 1;
1129 } else {
1130 /* be careful ... don't want any overflows */
1131 u64 factor = scmd->device->sector_size / 512;
1132 do_div(start_lba, factor);
1133 do_div(end_lba, factor);
1136 /* The bad lba was reported incorrectly, we have no idea where
1137 * the error is.
1139 if (bad_lba < start_lba || bad_lba >= end_lba)
1140 return 0;
1142 /* This computation should always be done in terms of
1143 * the resolution of the device's medium.
1145 return (bad_lba - start_lba) * scmd->device->sector_size;
1149 * sd_done - bottom half handler: called when the lower level
1150 * driver has completed (successfully or otherwise) a scsi command.
1151 * @SCpnt: mid-level's per command structure.
1153 * Note: potentially run from within an ISR. Must not block.
1155 static int sd_done(struct scsi_cmnd *SCpnt)
1157 int result = SCpnt->result;
1158 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1159 struct scsi_sense_hdr sshdr;
1160 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1161 int sense_valid = 0;
1162 int sense_deferred = 0;
1164 if (result) {
1165 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1166 if (sense_valid)
1167 sense_deferred = scsi_sense_is_deferred(&sshdr);
1169 #ifdef CONFIG_SCSI_LOGGING
1170 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1171 if (sense_valid) {
1172 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1173 "sd_done: sb[respc,sk,asc,"
1174 "ascq]=%x,%x,%x,%x\n",
1175 sshdr.response_code,
1176 sshdr.sense_key, sshdr.asc,
1177 sshdr.ascq));
1179 #endif
1180 if (driver_byte(result) != DRIVER_SENSE &&
1181 (!sense_valid || sense_deferred))
1182 goto out;
1184 switch (sshdr.sense_key) {
1185 case HARDWARE_ERROR:
1186 case MEDIUM_ERROR:
1187 good_bytes = sd_completed_bytes(SCpnt);
1188 break;
1189 case RECOVERED_ERROR:
1190 good_bytes = scsi_bufflen(SCpnt);
1191 break;
1192 case NO_SENSE:
1193 /* This indicates a false check condition, so ignore it. An
1194 * unknown amount of data was transferred so treat it as an
1195 * error.
1197 scsi_print_sense("sd", SCpnt);
1198 SCpnt->result = 0;
1199 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1200 break;
1201 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1202 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1203 if (sshdr.asc == 0x10)
1204 good_bytes = sd_completed_bytes(SCpnt);
1205 break;
1206 default:
1207 break;
1209 out:
1210 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1211 sd_dif_complete(SCpnt, good_bytes);
1213 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1214 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1216 /* We have to print a failed command here as the
1217 * extended CDB gets freed before scsi_io_completion()
1218 * is called.
1220 if (result)
1221 scsi_print_command(SCpnt);
1223 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1224 SCpnt->cmnd = NULL;
1225 SCpnt->cmd_len = 0;
1228 return good_bytes;
1231 static int media_not_present(struct scsi_disk *sdkp,
1232 struct scsi_sense_hdr *sshdr)
1235 if (!scsi_sense_valid(sshdr))
1236 return 0;
1237 /* not invoked for commands that could return deferred errors */
1238 if (sshdr->sense_key != NOT_READY &&
1239 sshdr->sense_key != UNIT_ATTENTION)
1240 return 0;
1241 if (sshdr->asc != 0x3A) /* medium not present */
1242 return 0;
1244 set_media_not_present(sdkp);
1245 return 1;
1249 * spinup disk - called only in sd_revalidate_disk()
1251 static void
1252 sd_spinup_disk(struct scsi_disk *sdkp)
1254 unsigned char cmd[10];
1255 unsigned long spintime_expire = 0;
1256 int retries, spintime;
1257 unsigned int the_result;
1258 struct scsi_sense_hdr sshdr;
1259 int sense_valid = 0;
1261 spintime = 0;
1263 /* Spin up drives, as required. Only do this at boot time */
1264 /* Spinup needs to be done for module loads too. */
1265 do {
1266 retries = 0;
1268 do {
1269 cmd[0] = TEST_UNIT_READY;
1270 memset((void *) &cmd[1], 0, 9);
1272 the_result = scsi_execute_req(sdkp->device, cmd,
1273 DMA_NONE, NULL, 0,
1274 &sshdr, SD_TIMEOUT,
1275 SD_MAX_RETRIES, NULL);
1278 * If the drive has indicated to us that it
1279 * doesn't have any media in it, don't bother
1280 * with any more polling.
1282 if (media_not_present(sdkp, &sshdr))
1283 return;
1285 if (the_result)
1286 sense_valid = scsi_sense_valid(&sshdr);
1287 retries++;
1288 } while (retries < 3 &&
1289 (!scsi_status_is_good(the_result) ||
1290 ((driver_byte(the_result) & DRIVER_SENSE) &&
1291 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1293 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1294 /* no sense, TUR either succeeded or failed
1295 * with a status error */
1296 if(!spintime && !scsi_status_is_good(the_result)) {
1297 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1298 sd_print_result(sdkp, the_result);
1300 break;
1304 * The device does not want the automatic start to be issued.
1306 if (sdkp->device->no_start_on_add)
1307 break;
1309 if (sense_valid && sshdr.sense_key == NOT_READY) {
1310 if (sshdr.asc == 4 && sshdr.ascq == 3)
1311 break; /* manual intervention required */
1312 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1313 break; /* standby */
1314 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1315 break; /* unavailable */
1317 * Issue command to spin up drive when not ready
1319 if (!spintime) {
1320 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1321 cmd[0] = START_STOP;
1322 cmd[1] = 1; /* Return immediately */
1323 memset((void *) &cmd[2], 0, 8);
1324 cmd[4] = 1; /* Start spin cycle */
1325 if (sdkp->device->start_stop_pwr_cond)
1326 cmd[4] |= 1 << 4;
1327 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1328 NULL, 0, &sshdr,
1329 SD_TIMEOUT, SD_MAX_RETRIES,
1330 NULL);
1331 spintime_expire = jiffies + 100 * HZ;
1332 spintime = 1;
1334 /* Wait 1 second for next try */
1335 msleep(1000);
1336 printk(".");
1339 * Wait for USB flash devices with slow firmware.
1340 * Yes, this sense key/ASC combination shouldn't
1341 * occur here. It's characteristic of these devices.
1343 } else if (sense_valid &&
1344 sshdr.sense_key == UNIT_ATTENTION &&
1345 sshdr.asc == 0x28) {
1346 if (!spintime) {
1347 spintime_expire = jiffies + 5 * HZ;
1348 spintime = 1;
1350 /* Wait 1 second for next try */
1351 msleep(1000);
1352 } else {
1353 /* we don't understand the sense code, so it's
1354 * probably pointless to loop */
1355 if(!spintime) {
1356 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1357 sd_print_sense_hdr(sdkp, &sshdr);
1359 break;
1362 } while (spintime && time_before_eq(jiffies, spintime_expire));
1364 if (spintime) {
1365 if (scsi_status_is_good(the_result))
1366 printk("ready\n");
1367 else
1368 printk("not responding...\n");
1374 * Determine whether disk supports Data Integrity Field.
1376 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1378 struct scsi_device *sdp = sdkp->device;
1379 u8 type;
1381 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1382 return;
1384 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1386 if (type == sdkp->protection_type || !sdkp->first_scan)
1387 return;
1389 sdkp->protection_type = type;
1391 if (type > SD_DIF_TYPE3_PROTECTION) {
1392 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1393 "protection type %u. Disabling disk!\n", type);
1394 sdkp->capacity = 0;
1395 return;
1398 if (scsi_host_dif_capable(sdp->host, type))
1399 sd_printk(KERN_NOTICE, sdkp,
1400 "Enabling DIF Type %u protection\n", type);
1401 else
1402 sd_printk(KERN_NOTICE, sdkp,
1403 "Disabling DIF Type %u protection\n", type);
1406 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1407 struct scsi_sense_hdr *sshdr, int sense_valid,
1408 int the_result)
1410 sd_print_result(sdkp, the_result);
1411 if (driver_byte(the_result) & DRIVER_SENSE)
1412 sd_print_sense_hdr(sdkp, sshdr);
1413 else
1414 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1417 * Set dirty bit for removable devices if not ready -
1418 * sometimes drives will not report this properly.
1420 if (sdp->removable &&
1421 sense_valid && sshdr->sense_key == NOT_READY)
1422 sdp->changed = 1;
1425 * We used to set media_present to 0 here to indicate no media
1426 * in the drive, but some drives fail read capacity even with
1427 * media present, so we can't do that.
1429 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1432 #define RC16_LEN 32
1433 #if RC16_LEN > SD_BUF_SIZE
1434 #error RC16_LEN must not be more than SD_BUF_SIZE
1435 #endif
1437 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1438 unsigned char *buffer)
1440 unsigned char cmd[16];
1441 struct scsi_sense_hdr sshdr;
1442 int sense_valid = 0;
1443 int the_result;
1444 int retries = 3;
1445 unsigned int alignment;
1446 unsigned long long lba;
1447 unsigned sector_size;
1449 do {
1450 memset(cmd, 0, 16);
1451 cmd[0] = SERVICE_ACTION_IN;
1452 cmd[1] = SAI_READ_CAPACITY_16;
1453 cmd[13] = RC16_LEN;
1454 memset(buffer, 0, RC16_LEN);
1456 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1457 buffer, RC16_LEN, &sshdr,
1458 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1460 if (media_not_present(sdkp, &sshdr))
1461 return -ENODEV;
1463 if (the_result) {
1464 sense_valid = scsi_sense_valid(&sshdr);
1465 if (sense_valid &&
1466 sshdr.sense_key == ILLEGAL_REQUEST &&
1467 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1468 sshdr.ascq == 0x00)
1469 /* Invalid Command Operation Code or
1470 * Invalid Field in CDB, just retry
1471 * silently with RC10 */
1472 return -EINVAL;
1474 retries--;
1476 } while (the_result && retries);
1478 if (the_result) {
1479 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1480 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1481 return -EINVAL;
1484 sector_size = get_unaligned_be32(&buffer[8]);
1485 lba = get_unaligned_be64(&buffer[0]);
1487 sd_read_protection_type(sdkp, buffer);
1489 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1490 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1491 "kernel compiled with support for large block "
1492 "devices.\n");
1493 sdkp->capacity = 0;
1494 return -EOVERFLOW;
1497 /* Logical blocks per physical block exponent */
1498 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1500 /* Lowest aligned logical block */
1501 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1502 blk_queue_alignment_offset(sdp->request_queue, alignment);
1503 if (alignment && sdkp->first_scan)
1504 sd_printk(KERN_NOTICE, sdkp,
1505 "physical block alignment offset: %u\n", alignment);
1507 if (buffer[14] & 0x80) { /* TPE */
1508 struct request_queue *q = sdp->request_queue;
1510 sdkp->thin_provisioning = 1;
1511 q->limits.discard_granularity = sdkp->hw_sector_size;
1512 q->limits.max_discard_sectors = 0xffffffff;
1514 if (buffer[14] & 0x40) /* TPRZ */
1515 q->limits.discard_zeroes_data = 1;
1517 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1520 sdkp->capacity = lba + 1;
1521 return sector_size;
1524 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1525 unsigned char *buffer)
1527 unsigned char cmd[16];
1528 struct scsi_sense_hdr sshdr;
1529 int sense_valid = 0;
1530 int the_result;
1531 int retries = 3;
1532 sector_t lba;
1533 unsigned sector_size;
1535 do {
1536 cmd[0] = READ_CAPACITY;
1537 memset(&cmd[1], 0, 9);
1538 memset(buffer, 0, 8);
1540 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1541 buffer, 8, &sshdr,
1542 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1544 if (media_not_present(sdkp, &sshdr))
1545 return -ENODEV;
1547 if (the_result)
1548 sense_valid = scsi_sense_valid(&sshdr);
1549 retries--;
1551 } while (the_result && retries);
1553 if (the_result) {
1554 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1555 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1556 return -EINVAL;
1559 sector_size = get_unaligned_be32(&buffer[4]);
1560 lba = get_unaligned_be32(&buffer[0]);
1562 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1563 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1564 "kernel compiled with support for large block "
1565 "devices.\n");
1566 sdkp->capacity = 0;
1567 return -EOVERFLOW;
1570 sdkp->capacity = lba + 1;
1571 sdkp->hw_sector_size = sector_size;
1572 return sector_size;
1575 static int sd_try_rc16_first(struct scsi_device *sdp)
1577 if (sdp->scsi_level > SCSI_SPC_2)
1578 return 1;
1579 if (scsi_device_protection(sdp))
1580 return 1;
1581 return 0;
1585 * read disk capacity
1587 static void
1588 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1590 int sector_size;
1591 struct scsi_device *sdp = sdkp->device;
1592 sector_t old_capacity = sdkp->capacity;
1594 if (sd_try_rc16_first(sdp)) {
1595 sector_size = read_capacity_16(sdkp, sdp, buffer);
1596 if (sector_size == -EOVERFLOW)
1597 goto got_data;
1598 if (sector_size == -ENODEV)
1599 return;
1600 if (sector_size < 0)
1601 sector_size = read_capacity_10(sdkp, sdp, buffer);
1602 if (sector_size < 0)
1603 return;
1604 } else {
1605 sector_size = read_capacity_10(sdkp, sdp, buffer);
1606 if (sector_size == -EOVERFLOW)
1607 goto got_data;
1608 if (sector_size < 0)
1609 return;
1610 if ((sizeof(sdkp->capacity) > 4) &&
1611 (sdkp->capacity > 0xffffffffULL)) {
1612 int old_sector_size = sector_size;
1613 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1614 "Trying to use READ CAPACITY(16).\n");
1615 sector_size = read_capacity_16(sdkp, sdp, buffer);
1616 if (sector_size < 0) {
1617 sd_printk(KERN_NOTICE, sdkp,
1618 "Using 0xffffffff as device size\n");
1619 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1620 sector_size = old_sector_size;
1621 goto got_data;
1626 /* Some devices are known to return the total number of blocks,
1627 * not the highest block number. Some devices have versions
1628 * which do this and others which do not. Some devices we might
1629 * suspect of doing this but we don't know for certain.
1631 * If we know the reported capacity is wrong, decrement it. If
1632 * we can only guess, then assume the number of blocks is even
1633 * (usually true but not always) and err on the side of lowering
1634 * the capacity.
1636 if (sdp->fix_capacity ||
1637 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1638 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1639 "from its reported value: %llu\n",
1640 (unsigned long long) sdkp->capacity);
1641 --sdkp->capacity;
1644 got_data:
1645 if (sector_size == 0) {
1646 sector_size = 512;
1647 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1648 "assuming 512.\n");
1651 if (sector_size != 512 &&
1652 sector_size != 1024 &&
1653 sector_size != 2048 &&
1654 sector_size != 4096 &&
1655 sector_size != 256) {
1656 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1657 sector_size);
1659 * The user might want to re-format the drive with
1660 * a supported sectorsize. Once this happens, it
1661 * would be relatively trivial to set the thing up.
1662 * For this reason, we leave the thing in the table.
1664 sdkp->capacity = 0;
1666 * set a bogus sector size so the normal read/write
1667 * logic in the block layer will eventually refuse any
1668 * request on this device without tripping over power
1669 * of two sector size assumptions
1671 sector_size = 512;
1673 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1676 char cap_str_2[10], cap_str_10[10];
1677 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1679 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1680 sizeof(cap_str_2));
1681 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1682 sizeof(cap_str_10));
1684 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1685 sd_printk(KERN_NOTICE, sdkp,
1686 "%llu %d-byte logical blocks: (%s/%s)\n",
1687 (unsigned long long)sdkp->capacity,
1688 sector_size, cap_str_10, cap_str_2);
1690 if (sdkp->hw_sector_size != sector_size)
1691 sd_printk(KERN_NOTICE, sdkp,
1692 "%u-byte physical blocks\n",
1693 sdkp->hw_sector_size);
1697 /* Rescale capacity to 512-byte units */
1698 if (sector_size == 4096)
1699 sdkp->capacity <<= 3;
1700 else if (sector_size == 2048)
1701 sdkp->capacity <<= 2;
1702 else if (sector_size == 1024)
1703 sdkp->capacity <<= 1;
1704 else if (sector_size == 256)
1705 sdkp->capacity >>= 1;
1707 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1708 sdkp->device->sector_size = sector_size;
1711 /* called with buffer of length 512 */
1712 static inline int
1713 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1714 unsigned char *buffer, int len, struct scsi_mode_data *data,
1715 struct scsi_sense_hdr *sshdr)
1717 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1718 SD_TIMEOUT, SD_MAX_RETRIES, data,
1719 sshdr);
1723 * read write protect setting, if possible - called only in sd_revalidate_disk()
1724 * called with buffer of length SD_BUF_SIZE
1726 static void
1727 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1729 int res;
1730 struct scsi_device *sdp = sdkp->device;
1731 struct scsi_mode_data data;
1732 int old_wp = sdkp->write_prot;
1734 set_disk_ro(sdkp->disk, 0);
1735 if (sdp->skip_ms_page_3f) {
1736 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1737 return;
1740 if (sdp->use_192_bytes_for_3f) {
1741 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1742 } else {
1744 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1745 * We have to start carefully: some devices hang if we ask
1746 * for more than is available.
1748 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1751 * Second attempt: ask for page 0 When only page 0 is
1752 * implemented, a request for page 3F may return Sense Key
1753 * 5: Illegal Request, Sense Code 24: Invalid field in
1754 * CDB.
1756 if (!scsi_status_is_good(res))
1757 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1760 * Third attempt: ask 255 bytes, as we did earlier.
1762 if (!scsi_status_is_good(res))
1763 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1764 &data, NULL);
1767 if (!scsi_status_is_good(res)) {
1768 sd_printk(KERN_WARNING, sdkp,
1769 "Test WP failed, assume Write Enabled\n");
1770 } else {
1771 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1772 set_disk_ro(sdkp->disk, sdkp->write_prot);
1773 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1774 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1775 sdkp->write_prot ? "on" : "off");
1776 sd_printk(KERN_DEBUG, sdkp,
1777 "Mode Sense: %02x %02x %02x %02x\n",
1778 buffer[0], buffer[1], buffer[2], buffer[3]);
1784 * sd_read_cache_type - called only from sd_revalidate_disk()
1785 * called with buffer of length SD_BUF_SIZE
1787 static void
1788 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1790 int len = 0, res;
1791 struct scsi_device *sdp = sdkp->device;
1793 int dbd;
1794 int modepage;
1795 struct scsi_mode_data data;
1796 struct scsi_sense_hdr sshdr;
1797 int old_wce = sdkp->WCE;
1798 int old_rcd = sdkp->RCD;
1799 int old_dpofua = sdkp->DPOFUA;
1801 if (sdp->skip_ms_page_8)
1802 goto defaults;
1804 if (sdp->type == TYPE_RBC) {
1805 modepage = 6;
1806 dbd = 8;
1807 } else {
1808 modepage = 8;
1809 dbd = 0;
1812 /* cautiously ask */
1813 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1815 if (!scsi_status_is_good(res))
1816 goto bad_sense;
1818 if (!data.header_length) {
1819 modepage = 6;
1820 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1823 /* that went OK, now ask for the proper length */
1824 len = data.length;
1827 * We're only interested in the first three bytes, actually.
1828 * But the data cache page is defined for the first 20.
1830 if (len < 3)
1831 goto bad_sense;
1832 if (len > 20)
1833 len = 20;
1835 /* Take headers and block descriptors into account */
1836 len += data.header_length + data.block_descriptor_length;
1837 if (len > SD_BUF_SIZE)
1838 goto bad_sense;
1840 /* Get the data */
1841 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1843 if (scsi_status_is_good(res)) {
1844 int offset = data.header_length + data.block_descriptor_length;
1846 if (offset >= SD_BUF_SIZE - 2) {
1847 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1848 goto defaults;
1851 if ((buffer[offset] & 0x3f) != modepage) {
1852 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1853 goto defaults;
1856 if (modepage == 8) {
1857 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1858 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1859 } else {
1860 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1861 sdkp->RCD = 0;
1864 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1865 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1866 sd_printk(KERN_NOTICE, sdkp,
1867 "Uses READ/WRITE(6), disabling FUA\n");
1868 sdkp->DPOFUA = 0;
1871 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1872 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1873 sd_printk(KERN_NOTICE, sdkp,
1874 "Write cache: %s, read cache: %s, %s\n",
1875 sdkp->WCE ? "enabled" : "disabled",
1876 sdkp->RCD ? "disabled" : "enabled",
1877 sdkp->DPOFUA ? "supports DPO and FUA"
1878 : "doesn't support DPO or FUA");
1880 return;
1883 bad_sense:
1884 if (scsi_sense_valid(&sshdr) &&
1885 sshdr.sense_key == ILLEGAL_REQUEST &&
1886 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1887 /* Invalid field in CDB */
1888 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1889 else
1890 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1892 defaults:
1893 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1894 sdkp->WCE = 0;
1895 sdkp->RCD = 0;
1896 sdkp->DPOFUA = 0;
1900 * The ATO bit indicates whether the DIF application tag is available
1901 * for use by the operating system.
1903 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1905 int res, offset;
1906 struct scsi_device *sdp = sdkp->device;
1907 struct scsi_mode_data data;
1908 struct scsi_sense_hdr sshdr;
1910 if (sdp->type != TYPE_DISK)
1911 return;
1913 if (sdkp->protection_type == 0)
1914 return;
1916 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1917 SD_MAX_RETRIES, &data, &sshdr);
1919 if (!scsi_status_is_good(res) || !data.header_length ||
1920 data.length < 6) {
1921 sd_printk(KERN_WARNING, sdkp,
1922 "getting Control mode page failed, assume no ATO\n");
1924 if (scsi_sense_valid(&sshdr))
1925 sd_print_sense_hdr(sdkp, &sshdr);
1927 return;
1930 offset = data.header_length + data.block_descriptor_length;
1932 if ((buffer[offset] & 0x3f) != 0x0a) {
1933 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1934 return;
1937 if ((buffer[offset + 5] & 0x80) == 0)
1938 return;
1940 sdkp->ATO = 1;
1942 return;
1946 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1947 * @disk: disk to query
1949 static void sd_read_block_limits(struct scsi_disk *sdkp)
1951 struct request_queue *q = sdkp->disk->queue;
1952 unsigned int sector_sz = sdkp->device->sector_size;
1953 const int vpd_len = 64;
1954 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
1956 if (!buffer ||
1957 /* Block Limits VPD */
1958 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
1959 goto out;
1961 blk_queue_io_min(sdkp->disk->queue,
1962 get_unaligned_be16(&buffer[6]) * sector_sz);
1963 blk_queue_io_opt(sdkp->disk->queue,
1964 get_unaligned_be32(&buffer[12]) * sector_sz);
1966 /* Thin provisioning enabled and page length indicates TP support */
1967 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
1968 unsigned int lba_count, desc_count, granularity;
1970 lba_count = get_unaligned_be32(&buffer[20]);
1971 desc_count = get_unaligned_be32(&buffer[24]);
1973 if (lba_count) {
1974 q->limits.max_discard_sectors =
1975 lba_count * sector_sz >> 9;
1977 if (desc_count)
1978 sdkp->unmap = 1;
1981 granularity = get_unaligned_be32(&buffer[28]);
1983 if (granularity)
1984 q->limits.discard_granularity = granularity * sector_sz;
1986 if (buffer[32] & 0x80)
1987 q->limits.discard_alignment =
1988 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
1991 out:
1992 kfree(buffer);
1996 * sd_read_block_characteristics - Query block dev. characteristics
1997 * @disk: disk to query
1999 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2001 unsigned char *buffer;
2002 u16 rot;
2003 const int vpd_len = 64;
2005 buffer = kmalloc(vpd_len, GFP_KERNEL);
2007 if (!buffer ||
2008 /* Block Device Characteristics VPD */
2009 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2010 goto out;
2012 rot = get_unaligned_be16(&buffer[4]);
2014 if (rot == 1)
2015 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2017 out:
2018 kfree(buffer);
2021 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2024 * Although VPD inquiries can go to SCSI-2 type devices,
2025 * some USB ones crash on receiving them, and the pages
2026 * we currently ask for are for SPC-3 and beyond
2028 if (sdp->scsi_level > SCSI_SPC_2)
2029 return 1;
2030 return 0;
2034 * sd_revalidate_disk - called the first time a new disk is seen,
2035 * performs disk spin up, read_capacity, etc.
2036 * @disk: struct gendisk we care about
2038 static int sd_revalidate_disk(struct gendisk *disk)
2040 struct scsi_disk *sdkp = scsi_disk(disk);
2041 struct scsi_device *sdp = sdkp->device;
2042 unsigned char *buffer;
2043 unsigned ordered;
2045 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2046 "sd_revalidate_disk\n"));
2049 * If the device is offline, don't try and read capacity or any
2050 * of the other niceties.
2052 if (!scsi_device_online(sdp))
2053 goto out;
2055 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2056 if (!buffer) {
2057 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2058 "allocation failure.\n");
2059 goto out;
2062 sd_spinup_disk(sdkp);
2065 * Without media there is no reason to ask; moreover, some devices
2066 * react badly if we do.
2068 if (sdkp->media_present) {
2069 sd_read_capacity(sdkp, buffer);
2071 if (sd_try_extended_inquiry(sdp)) {
2072 sd_read_block_limits(sdkp);
2073 sd_read_block_characteristics(sdkp);
2076 sd_read_write_protect_flag(sdkp, buffer);
2077 sd_read_cache_type(sdkp, buffer);
2078 sd_read_app_tag_own(sdkp, buffer);
2081 sdkp->first_scan = 0;
2084 * We now have all cache related info, determine how we deal
2085 * with ordered requests. Note that as the current SCSI
2086 * dispatch function can alter request order, we cannot use
2087 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2089 if (sdkp->WCE)
2090 ordered = sdkp->DPOFUA
2091 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2092 else
2093 ordered = QUEUE_ORDERED_DRAIN;
2095 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
2097 set_capacity(disk, sdkp->capacity);
2098 kfree(buffer);
2100 out:
2101 return 0;
2105 * sd_format_disk_name - format disk name
2106 * @prefix: name prefix - ie. "sd" for SCSI disks
2107 * @index: index of the disk to format name for
2108 * @buf: output buffer
2109 * @buflen: length of the output buffer
2111 * SCSI disk names starts at sda. The 26th device is sdz and the
2112 * 27th is sdaa. The last one for two lettered suffix is sdzz
2113 * which is followed by sdaaa.
2115 * This is basically 26 base counting with one extra 'nil' entry
2116 * at the beginning from the second digit on and can be
2117 * determined using similar method as 26 base conversion with the
2118 * index shifted -1 after each digit is computed.
2120 * CONTEXT:
2121 * Don't care.
2123 * RETURNS:
2124 * 0 on success, -errno on failure.
2126 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2128 const int base = 'z' - 'a' + 1;
2129 char *begin = buf + strlen(prefix);
2130 char *end = buf + buflen;
2131 char *p;
2132 int unit;
2134 p = end - 1;
2135 *p = '\0';
2136 unit = base;
2137 do {
2138 if (p == begin)
2139 return -EINVAL;
2140 *--p = 'a' + (index % unit);
2141 index = (index / unit) - 1;
2142 } while (index >= 0);
2144 memmove(begin, p, end - p);
2145 memcpy(buf, prefix, strlen(prefix));
2147 return 0;
2151 * The asynchronous part of sd_probe
2153 static void sd_probe_async(void *data, async_cookie_t cookie)
2155 struct scsi_disk *sdkp = data;
2156 struct scsi_device *sdp;
2157 struct gendisk *gd;
2158 u32 index;
2159 struct device *dev;
2161 sdp = sdkp->device;
2162 gd = sdkp->disk;
2163 index = sdkp->index;
2164 dev = &sdp->sdev_gendev;
2166 if (index < SD_MAX_DISKS) {
2167 gd->major = sd_major((index & 0xf0) >> 4);
2168 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2169 gd->minors = SD_MINORS;
2171 gd->fops = &sd_fops;
2172 gd->private_data = &sdkp->driver;
2173 gd->queue = sdkp->device->request_queue;
2175 /* defaults, until the device tells us otherwise */
2176 sdp->sector_size = 512;
2177 sdkp->capacity = 0;
2178 sdkp->media_present = 1;
2179 sdkp->write_prot = 0;
2180 sdkp->WCE = 0;
2181 sdkp->RCD = 0;
2182 sdkp->ATO = 0;
2183 sdkp->first_scan = 1;
2185 sd_revalidate_disk(gd);
2187 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2189 gd->driverfs_dev = &sdp->sdev_gendev;
2190 gd->flags = GENHD_FL_EXT_DEVT;
2191 if (sdp->removable)
2192 gd->flags |= GENHD_FL_REMOVABLE;
2194 dev_set_drvdata(dev, sdkp);
2195 add_disk(gd);
2196 sd_dif_config_host(sdkp);
2198 sd_revalidate_disk(gd);
2200 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2201 sdp->removable ? "removable " : "");
2202 put_device(&sdkp->dev);
2206 * sd_probe - called during driver initialization and whenever a
2207 * new scsi device is attached to the system. It is called once
2208 * for each scsi device (not just disks) present.
2209 * @dev: pointer to device object
2211 * Returns 0 if successful (or not interested in this scsi device
2212 * (e.g. scanner)); 1 when there is an error.
2214 * Note: this function is invoked from the scsi mid-level.
2215 * This function sets up the mapping between a given
2216 * <host,channel,id,lun> (found in sdp) and new device name
2217 * (e.g. /dev/sda). More precisely it is the block device major
2218 * and minor number that is chosen here.
2220 * Assume sd_attach is not re-entrant (for time being)
2221 * Also think about sd_attach() and sd_remove() running coincidentally.
2223 static int sd_probe(struct device *dev)
2225 struct scsi_device *sdp = to_scsi_device(dev);
2226 struct scsi_disk *sdkp;
2227 struct gendisk *gd;
2228 u32 index;
2229 int error;
2231 error = -ENODEV;
2232 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2233 goto out;
2235 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2236 "sd_attach\n"));
2238 error = -ENOMEM;
2239 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2240 if (!sdkp)
2241 goto out;
2243 gd = alloc_disk(SD_MINORS);
2244 if (!gd)
2245 goto out_free;
2247 do {
2248 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2249 goto out_put;
2251 spin_lock(&sd_index_lock);
2252 error = ida_get_new(&sd_index_ida, &index);
2253 spin_unlock(&sd_index_lock);
2254 } while (error == -EAGAIN);
2256 if (error)
2257 goto out_put;
2259 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2260 if (error)
2261 goto out_free_index;
2263 sdkp->device = sdp;
2264 sdkp->driver = &sd_template;
2265 sdkp->disk = gd;
2266 sdkp->index = index;
2267 sdkp->openers = 0;
2268 sdkp->previous_state = 1;
2270 if (!sdp->request_queue->rq_timeout) {
2271 if (sdp->type != TYPE_MOD)
2272 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2273 else
2274 blk_queue_rq_timeout(sdp->request_queue,
2275 SD_MOD_TIMEOUT);
2278 device_initialize(&sdkp->dev);
2279 sdkp->dev.parent = &sdp->sdev_gendev;
2280 sdkp->dev.class = &sd_disk_class;
2281 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2283 if (device_add(&sdkp->dev))
2284 goto out_free_index;
2286 get_device(&sdp->sdev_gendev);
2288 get_device(&sdkp->dev); /* prevent release before async_schedule */
2289 async_schedule(sd_probe_async, sdkp);
2291 return 0;
2293 out_free_index:
2294 spin_lock(&sd_index_lock);
2295 ida_remove(&sd_index_ida, index);
2296 spin_unlock(&sd_index_lock);
2297 out_put:
2298 put_disk(gd);
2299 out_free:
2300 kfree(sdkp);
2301 out:
2302 return error;
2306 * sd_remove - called whenever a scsi disk (previously recognized by
2307 * sd_probe) is detached from the system. It is called (potentially
2308 * multiple times) during sd module unload.
2309 * @sdp: pointer to mid level scsi device object
2311 * Note: this function is invoked from the scsi mid-level.
2312 * This function potentially frees up a device name (e.g. /dev/sdc)
2313 * that could be re-used by a subsequent sd_probe().
2314 * This function is not called when the built-in sd driver is "exit-ed".
2316 static int sd_remove(struct device *dev)
2318 struct scsi_disk *sdkp;
2320 async_synchronize_full();
2321 sdkp = dev_get_drvdata(dev);
2322 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2323 device_del(&sdkp->dev);
2324 del_gendisk(sdkp->disk);
2325 sd_shutdown(dev);
2327 mutex_lock(&sd_ref_mutex);
2328 dev_set_drvdata(dev, NULL);
2329 put_device(&sdkp->dev);
2330 mutex_unlock(&sd_ref_mutex);
2332 return 0;
2336 * scsi_disk_release - Called to free the scsi_disk structure
2337 * @dev: pointer to embedded class device
2339 * sd_ref_mutex must be held entering this routine. Because it is
2340 * called on last put, you should always use the scsi_disk_get()
2341 * scsi_disk_put() helpers which manipulate the semaphore directly
2342 * and never do a direct put_device.
2344 static void scsi_disk_release(struct device *dev)
2346 struct scsi_disk *sdkp = to_scsi_disk(dev);
2347 struct gendisk *disk = sdkp->disk;
2349 spin_lock(&sd_index_lock);
2350 ida_remove(&sd_index_ida, sdkp->index);
2351 spin_unlock(&sd_index_lock);
2353 disk->private_data = NULL;
2354 put_disk(disk);
2355 put_device(&sdkp->device->sdev_gendev);
2357 kfree(sdkp);
2360 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2362 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2363 struct scsi_sense_hdr sshdr;
2364 struct scsi_device *sdp = sdkp->device;
2365 int res;
2367 if (start)
2368 cmd[4] |= 1; /* START */
2370 if (sdp->start_stop_pwr_cond)
2371 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2373 if (!scsi_device_online(sdp))
2374 return -ENODEV;
2376 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2377 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2378 if (res) {
2379 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2380 sd_print_result(sdkp, res);
2381 if (driver_byte(res) & DRIVER_SENSE)
2382 sd_print_sense_hdr(sdkp, &sshdr);
2385 return res;
2389 * Send a SYNCHRONIZE CACHE instruction down to the device through
2390 * the normal SCSI command structure. Wait for the command to
2391 * complete.
2393 static void sd_shutdown(struct device *dev)
2395 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2397 if (!sdkp)
2398 return; /* this can happen */
2400 if (sdkp->WCE) {
2401 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2402 sd_sync_cache(sdkp);
2405 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2406 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2407 sd_start_stop_device(sdkp, 0);
2410 scsi_disk_put(sdkp);
2413 static int sd_suspend(struct device *dev, pm_message_t mesg)
2415 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2416 int ret = 0;
2418 if (!sdkp)
2419 return 0; /* this can happen */
2421 if (sdkp->WCE) {
2422 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2423 ret = sd_sync_cache(sdkp);
2424 if (ret)
2425 goto done;
2428 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2429 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2430 ret = sd_start_stop_device(sdkp, 0);
2433 done:
2434 scsi_disk_put(sdkp);
2435 return ret;
2438 static int sd_resume(struct device *dev)
2440 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2441 int ret = 0;
2443 if (!sdkp->device->manage_start_stop)
2444 goto done;
2446 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2447 ret = sd_start_stop_device(sdkp, 1);
2449 done:
2450 scsi_disk_put(sdkp);
2451 return ret;
2455 * init_sd - entry point for this driver (both when built in or when
2456 * a module).
2458 * Note: this function registers this driver with the scsi mid-level.
2460 static int __init init_sd(void)
2462 int majors = 0, i, err;
2464 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2466 for (i = 0; i < SD_MAJORS; i++)
2467 if (register_blkdev(sd_major(i), "sd") == 0)
2468 majors++;
2470 if (!majors)
2471 return -ENODEV;
2473 err = class_register(&sd_disk_class);
2474 if (err)
2475 goto err_out;
2477 err = scsi_register_driver(&sd_template.gendrv);
2478 if (err)
2479 goto err_out_class;
2481 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2482 0, 0, NULL);
2483 if (!sd_cdb_cache) {
2484 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2485 goto err_out_class;
2488 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2489 if (!sd_cdb_pool) {
2490 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2491 goto err_out_cache;
2494 return 0;
2496 err_out_cache:
2497 kmem_cache_destroy(sd_cdb_cache);
2499 err_out_class:
2500 class_unregister(&sd_disk_class);
2501 err_out:
2502 for (i = 0; i < SD_MAJORS; i++)
2503 unregister_blkdev(sd_major(i), "sd");
2504 return err;
2508 * exit_sd - exit point for this driver (when it is a module).
2510 * Note: this function unregisters this driver from the scsi mid-level.
2512 static void __exit exit_sd(void)
2514 int i;
2516 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2518 mempool_destroy(sd_cdb_pool);
2519 kmem_cache_destroy(sd_cdb_cache);
2521 scsi_unregister_driver(&sd_template.gendrv);
2522 class_unregister(&sd_disk_class);
2524 for (i = 0; i < SD_MAJORS; i++)
2525 unregister_blkdev(sd_major(i), "sd");
2528 module_init(init_sd);
2529 module_exit(exit_sd);
2531 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2532 struct scsi_sense_hdr *sshdr)
2534 sd_printk(KERN_INFO, sdkp, "");
2535 scsi_show_sense_hdr(sshdr);
2536 sd_printk(KERN_INFO, sdkp, "");
2537 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2540 static void sd_print_result(struct scsi_disk *sdkp, int result)
2542 sd_printk(KERN_INFO, sdkp, "");
2543 scsi_show_result(result);