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 <asm/uaccess.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_device.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_eh.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/scsicam.h>
63 #include "scsi_logging.h"
65 MODULE_AUTHOR("Eric Youngdale");
66 MODULE_DESCRIPTION("SCSI disk (sd) driver");
67 MODULE_LICENSE("GPL");
69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
85 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
89 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
95 static int sd_revalidate_disk(struct gendisk *);
96 static int sd_probe(struct device *);
97 static int sd_remove(struct device *);
98 static void sd_shutdown(struct device *);
99 static int sd_suspend(struct device *, pm_message_t state);
100 static int sd_resume(struct device *);
101 static void sd_rescan(struct device *);
102 static int sd_done(struct scsi_cmnd *);
103 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
104 static void scsi_disk_release(struct device *cdev);
105 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
106 static void sd_print_result(struct scsi_disk *, int);
108 static DEFINE_IDA(sd_index_ida);
110 /* This semaphore is used to mediate the 0->1 reference get in the
111 * face of object destruction (i.e. we can't allow a get on an
112 * object after last put) */
113 static DEFINE_MUTEX(sd_ref_mutex);
115 static const char *sd_cache_types[] = {
116 "write through", "none", "write back",
117 "write back, no read (daft)"
121 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
122 const char *buf, size_t count)
124 int i, ct = -1, rcd, wce, sp;
125 struct scsi_disk *sdkp = to_scsi_disk(dev);
126 struct scsi_device *sdp = sdkp->device;
129 struct scsi_mode_data data;
130 struct scsi_sense_hdr sshdr;
133 if (sdp->type != TYPE_DISK)
134 /* no cache control on RBC devices; theoretically they
135 * can do it, but there's probably so many exceptions
136 * it's not worth the risk */
139 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
140 const int len = strlen(sd_cache_types[i]);
141 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
149 rcd = ct & 0x01 ? 1 : 0;
150 wce = ct & 0x02 ? 1 : 0;
151 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
152 SD_MAX_RETRIES, &data, NULL))
154 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
155 data.block_descriptor_length);
156 buffer_data = buffer + data.header_length +
157 data.block_descriptor_length;
158 buffer_data[2] &= ~0x05;
159 buffer_data[2] |= wce << 2 | rcd;
160 sp = buffer_data[0] & 0x80 ? 1 : 0;
162 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
163 SD_MAX_RETRIES, &data, &sshdr)) {
164 if (scsi_sense_valid(&sshdr))
165 sd_print_sense_hdr(sdkp, &sshdr);
168 revalidate_disk(sdkp->disk);
173 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
174 const char *buf, size_t count)
176 struct scsi_disk *sdkp = to_scsi_disk(dev);
177 struct scsi_device *sdp = sdkp->device;
179 if (!capable(CAP_SYS_ADMIN))
182 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
188 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
189 const char *buf, size_t count)
191 struct scsi_disk *sdkp = to_scsi_disk(dev);
192 struct scsi_device *sdp = sdkp->device;
194 if (!capable(CAP_SYS_ADMIN))
197 if (sdp->type != TYPE_DISK)
200 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
206 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
209 struct scsi_disk *sdkp = to_scsi_disk(dev);
210 int ct = sdkp->RCD + 2*sdkp->WCE;
212 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
216 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
218 struct scsi_disk *sdkp = to_scsi_disk(dev);
220 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
224 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
227 struct scsi_disk *sdkp = to_scsi_disk(dev);
228 struct scsi_device *sdp = sdkp->device;
230 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
234 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
237 struct scsi_disk *sdkp = to_scsi_disk(dev);
239 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
243 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
246 struct scsi_disk *sdkp = to_scsi_disk(dev);
248 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
252 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
255 struct scsi_disk *sdkp = to_scsi_disk(dev);
257 return snprintf(buf, 20, "%u\n", sdkp->ATO);
260 static struct device_attribute sd_disk_attrs[] = {
261 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
262 sd_store_cache_type),
263 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
264 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
265 sd_store_allow_restart),
266 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
267 sd_store_manage_start_stop),
268 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
269 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
273 static struct class sd_disk_class = {
275 .owner = THIS_MODULE,
276 .dev_release = scsi_disk_release,
277 .dev_attrs = sd_disk_attrs,
280 static struct scsi_driver sd_template = {
281 .owner = THIS_MODULE,
286 .suspend = sd_suspend,
288 .shutdown = sd_shutdown,
295 * Device no to disk mapping:
297 * major disc2 disc p1
298 * |............|.............|....|....| <- dev_t
301 * Inside a major, we have 16k disks, however mapped non-
302 * contiguously. The first 16 disks are for major0, the next
303 * ones with major1, ... Disk 256 is for major0 again, disk 272
305 * As we stay compatible with our numbering scheme, we can reuse
306 * the well-know SCSI majors 8, 65--71, 136--143.
308 static int sd_major(int major_idx)
312 return SCSI_DISK0_MAJOR;
314 return SCSI_DISK1_MAJOR + major_idx - 1;
316 return SCSI_DISK8_MAJOR + major_idx - 8;
319 return 0; /* shut up gcc */
323 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
325 struct scsi_disk *sdkp = NULL;
327 if (disk->private_data) {
328 sdkp = scsi_disk(disk);
329 if (scsi_device_get(sdkp->device) == 0)
330 get_device(&sdkp->dev);
337 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
339 struct scsi_disk *sdkp;
341 mutex_lock(&sd_ref_mutex);
342 sdkp = __scsi_disk_get(disk);
343 mutex_unlock(&sd_ref_mutex);
347 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
349 struct scsi_disk *sdkp;
351 mutex_lock(&sd_ref_mutex);
352 sdkp = dev_get_drvdata(dev);
354 sdkp = __scsi_disk_get(sdkp->disk);
355 mutex_unlock(&sd_ref_mutex);
359 static void scsi_disk_put(struct scsi_disk *sdkp)
361 struct scsi_device *sdev = sdkp->device;
363 mutex_lock(&sd_ref_mutex);
364 put_device(&sdkp->dev);
365 scsi_device_put(sdev);
366 mutex_unlock(&sd_ref_mutex);
370 * sd_init_command - build a scsi (read or write) command from
371 * information in the request structure.
372 * @SCpnt: pointer to mid-level's per scsi command structure that
373 * contains request and into which the scsi command is written
375 * Returns 1 if successful and 0 if error (or cannot be done now).
377 static int sd_prep_fn(struct request_queue *q, struct request *rq)
379 struct scsi_cmnd *SCpnt;
380 struct scsi_device *sdp = q->queuedata;
381 struct gendisk *disk = rq->rq_disk;
382 struct scsi_disk *sdkp;
383 sector_t block = rq->sector;
385 unsigned int this_count = rq->nr_sectors;
388 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
389 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
391 } else if (rq->cmd_type != REQ_TYPE_FS) {
395 ret = scsi_setup_fs_cmnd(sdp, rq);
396 if (ret != BLKPREP_OK)
399 sdkp = scsi_disk(disk);
401 /* from here on until we're complete, any goto out
402 * is used for a killable error condition */
405 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
406 "sd_init_command: block=%llu, "
408 (unsigned long long)block,
411 if (!sdp || !scsi_device_online(sdp) ||
412 block + rq->nr_sectors > get_capacity(disk)) {
413 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
414 "Finishing %ld sectors\n",
416 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
417 "Retry with 0x%p\n", SCpnt));
423 * quietly refuse to do anything to a changed disc until
424 * the changed bit has been reset
426 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
431 * Some SD card readers can't handle multi-sector accesses which touch
432 * the last one or two hardware sectors. Split accesses as needed.
434 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
435 (sdp->sector_size / 512);
437 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
438 if (block < threshold) {
439 /* Access up to the threshold but not beyond */
440 this_count = threshold - block;
442 /* Access only a single hardware sector */
443 this_count = sdp->sector_size / 512;
447 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
448 (unsigned long long)block));
451 * If we have a 1K hardware sectorsize, prevent access to single
452 * 512 byte sectors. In theory we could handle this - in fact
453 * the scsi cdrom driver must be able to handle this because
454 * we typically use 1K blocksizes, and cdroms typically have
455 * 2K hardware sectorsizes. Of course, things are simpler
456 * with the cdrom, since it is read-only. For performance
457 * reasons, the filesystems should be able to handle this
458 * and not force the scsi disk driver to use bounce buffers
461 if (sdp->sector_size == 1024) {
462 if ((block & 1) || (rq->nr_sectors & 1)) {
463 scmd_printk(KERN_ERR, SCpnt,
464 "Bad block number requested\n");
468 this_count = this_count >> 1;
471 if (sdp->sector_size == 2048) {
472 if ((block & 3) || (rq->nr_sectors & 3)) {
473 scmd_printk(KERN_ERR, SCpnt,
474 "Bad block number requested\n");
478 this_count = this_count >> 2;
481 if (sdp->sector_size == 4096) {
482 if ((block & 7) || (rq->nr_sectors & 7)) {
483 scmd_printk(KERN_ERR, SCpnt,
484 "Bad block number requested\n");
488 this_count = this_count >> 3;
491 if (rq_data_dir(rq) == WRITE) {
492 if (!sdp->writeable) {
495 SCpnt->cmnd[0] = WRITE_6;
496 SCpnt->sc_data_direction = DMA_TO_DEVICE;
498 if (blk_integrity_rq(rq) &&
499 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
502 } else if (rq_data_dir(rq) == READ) {
503 SCpnt->cmnd[0] = READ_6;
504 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
506 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
510 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
511 "%s %d/%ld 512 byte blocks.\n",
512 (rq_data_dir(rq) == WRITE) ?
513 "writing" : "reading", this_count,
516 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
517 if (scsi_host_dif_capable(sdp->host, sdkp->protection_type))
518 SCpnt->cmnd[1] = 1 << 5;
522 if (block > 0xffffffff) {
523 SCpnt->cmnd[0] += READ_16 - READ_6;
524 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
525 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
526 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
527 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
528 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
529 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
530 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
531 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
532 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
533 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
534 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
535 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
536 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
537 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
538 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
539 scsi_device_protection(SCpnt->device) ||
540 SCpnt->device->use_10_for_rw) {
541 if (this_count > 0xffff)
544 SCpnt->cmnd[0] += READ_10 - READ_6;
545 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
546 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
547 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
548 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
549 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
550 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
551 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
552 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
554 if (unlikely(blk_fua_rq(rq))) {
556 * This happens only if this drive failed
557 * 10byte rw command with ILLEGAL_REQUEST
558 * during operation and thus turned off
561 scmd_printk(KERN_ERR, SCpnt,
562 "FUA write on READ/WRITE(6) drive\n");
566 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
567 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
568 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
569 SCpnt->cmnd[4] = (unsigned char) this_count;
572 SCpnt->sdb.length = this_count * sdp->sector_size;
574 /* If DIF or DIX is enabled, tell HBA how to handle request */
575 if (sdkp->protection_type || scsi_prot_sg_count(SCpnt))
576 sd_dif_op(SCpnt, sdkp->protection_type, scsi_prot_sg_count(SCpnt));
579 * We shouldn't disconnect in the middle of a sector, so with a dumb
580 * host adapter, it's safe to assume that we can at least transfer
581 * this many bytes between each connect / disconnect.
583 SCpnt->transfersize = sdp->sector_size;
584 SCpnt->underflow = this_count << 9;
585 SCpnt->allowed = SD_MAX_RETRIES;
588 * This indicates that the command is ready from our end to be
593 return scsi_prep_return(q, rq, ret);
597 * sd_open - open a scsi disk device
598 * @inode: only i_rdev member may be used
599 * @filp: only f_mode and f_flags may be used
601 * Returns 0 if successful. Returns a negated errno value in case
604 * Note: This can be called from a user context (e.g. fsck(1) )
605 * or from within the kernel (e.g. as a result of a mount(1) ).
606 * In the latter case @inode and @filp carry an abridged amount
607 * of information as noted above.
609 static int sd_open(struct inode *inode, struct file *filp)
611 struct gendisk *disk = inode->i_bdev->bd_disk;
612 struct scsi_disk *sdkp;
613 struct scsi_device *sdev;
616 if (!(sdkp = scsi_disk_get(disk)))
620 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
625 * If the device is in error recovery, wait until it is done.
626 * If the device is offline, then disallow any access to it.
629 if (!scsi_block_when_processing_errors(sdev))
632 if (sdev->removable || sdkp->write_prot)
633 check_disk_change(inode->i_bdev);
636 * If the drive is empty, just let the open fail.
639 if (sdev->removable && !sdkp->media_present &&
640 !(filp->f_flags & O_NDELAY))
644 * If the device has the write protect tab set, have the open fail
645 * if the user expects to be able to write to the thing.
648 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
652 * It is possible that the disk changing stuff resulted in
653 * the device being taken offline. If this is the case,
654 * report this to the user, and don't pretend that the
655 * open actually succeeded.
658 if (!scsi_device_online(sdev))
661 if (!sdkp->openers++ && sdev->removable) {
662 if (scsi_block_when_processing_errors(sdev))
663 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
674 * sd_release - invoked when the (last) close(2) is called on this
676 * @inode: only i_rdev member may be used
677 * @filp: only f_mode and f_flags may be used
681 * Note: may block (uninterruptible) if error recovery is underway
684 static int sd_release(struct inode *inode, struct file *filp)
686 struct gendisk *disk = inode->i_bdev->bd_disk;
687 struct scsi_disk *sdkp = scsi_disk(disk);
688 struct scsi_device *sdev = sdkp->device;
690 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
692 if (!--sdkp->openers && sdev->removable) {
693 if (scsi_block_when_processing_errors(sdev))
694 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
698 * XXX and what if there are packets in flight and this close()
699 * XXX is followed by a "rmmod sd_mod"?
705 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
707 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
708 struct scsi_device *sdp = sdkp->device;
709 struct Scsi_Host *host = sdp->host;
712 /* default to most commonly used values */
713 diskinfo[0] = 0x40; /* 1 << 6 */
714 diskinfo[1] = 0x20; /* 1 << 5 */
715 diskinfo[2] = sdkp->capacity >> 11;
717 /* override with calculated, extended default, or driver values */
718 if (host->hostt->bios_param)
719 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
721 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
723 geo->heads = diskinfo[0];
724 geo->sectors = diskinfo[1];
725 geo->cylinders = diskinfo[2];
730 * sd_ioctl - process an ioctl
731 * @inode: only i_rdev/i_bdev members may be used
732 * @filp: only f_mode and f_flags may be used
733 * @cmd: ioctl command number
734 * @arg: this is third argument given to ioctl(2) system call.
735 * Often contains a pointer.
737 * Returns 0 if successful (some ioctls return postive numbers on
738 * success as well). Returns a negated errno value in case of error.
740 * Note: most ioctls are forward onto the block subsystem or further
741 * down in the scsi subsystem.
743 static int sd_ioctl(struct inode * inode, struct file * filp,
744 unsigned int cmd, unsigned long arg)
746 struct block_device *bdev = inode->i_bdev;
747 struct gendisk *disk = bdev->bd_disk;
748 struct scsi_device *sdp = scsi_disk(disk)->device;
749 void __user *p = (void __user *)arg;
752 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
753 disk->disk_name, cmd));
756 * If we are in the middle of error recovery, don't let anyone
757 * else try and use this device. Also, if error recovery fails, it
758 * may try and take the device offline, in which case all further
759 * access to the device is prohibited.
761 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
762 if (!scsi_block_when_processing_errors(sdp) || !error)
766 * Send SCSI addressing ioctls directly to mid level, send other
767 * ioctls to block level and then onto mid level if they can't be
771 case SCSI_IOCTL_GET_IDLUN:
772 case SCSI_IOCTL_GET_BUS_NUMBER:
773 return scsi_ioctl(sdp, cmd, p);
775 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
776 if (error != -ENOTTY)
779 return scsi_ioctl(sdp, cmd, p);
782 static void set_media_not_present(struct scsi_disk *sdkp)
784 sdkp->media_present = 0;
786 sdkp->device->changed = 1;
790 * sd_media_changed - check if our medium changed
791 * @disk: kernel device descriptor
793 * Returns 0 if not applicable or no change; 1 if change
795 * Note: this function is invoked from the block subsystem.
797 static int sd_media_changed(struct gendisk *disk)
799 struct scsi_disk *sdkp = scsi_disk(disk);
800 struct scsi_device *sdp = sdkp->device;
801 struct scsi_sense_hdr *sshdr = NULL;
804 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
810 * If the device is offline, don't send any commands - just pretend as
811 * if the command failed. If the device ever comes back online, we
812 * can deal with it then. It is only because of unrecoverable errors
813 * that we would ever take a device offline in the first place.
815 if (!scsi_device_online(sdp)) {
816 set_media_not_present(sdkp);
822 * Using TEST_UNIT_READY enables differentiation between drive with
823 * no cartridge loaded - NOT READY, drive with changed cartridge -
824 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
826 * Drives that auto spin down. eg iomega jaz 1G, will be started
827 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
828 * sd_revalidate() is called.
832 if (scsi_block_when_processing_errors(sdp)) {
833 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
834 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
839 * Unable to test, unit probably not ready. This usually
840 * means there is no disc in the drive. Mark as changed,
841 * and we will figure it out later once the drive is
844 if (retval || (scsi_sense_valid(sshdr) &&
845 /* 0x3a is medium not present */
846 sshdr->asc == 0x3a)) {
847 set_media_not_present(sdkp);
853 * For removable scsi disk we have to recognise the presence
854 * of a disk in the drive. This is kept in the struct scsi_disk
855 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
857 sdkp->media_present = 1;
859 retval = sdp->changed;
862 if (retval != sdkp->previous_state)
863 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
864 sdkp->previous_state = retval;
869 static int sd_sync_cache(struct scsi_disk *sdkp)
872 struct scsi_device *sdp = sdkp->device;
873 struct scsi_sense_hdr sshdr;
875 if (!scsi_device_online(sdp))
879 for (retries = 3; retries > 0; --retries) {
880 unsigned char cmd[10] = { 0 };
882 cmd[0] = SYNCHRONIZE_CACHE;
884 * Leave the rest of the command zero to indicate
887 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
888 SD_TIMEOUT, SD_MAX_RETRIES);
894 sd_print_result(sdkp, res);
895 if (driver_byte(res) & DRIVER_SENSE)
896 sd_print_sense_hdr(sdkp, &sshdr);
904 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
906 rq->cmd_type = REQ_TYPE_BLOCK_PC;
907 rq->timeout = SD_TIMEOUT;
908 rq->cmd[0] = SYNCHRONIZE_CACHE;
912 static void sd_rescan(struct device *dev)
914 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
917 revalidate_disk(sdkp->disk);
925 * This gets directly called from VFS. When the ioctl
926 * is not recognized we go back to the other translation paths.
928 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
930 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
931 struct gendisk *disk = bdev->bd_disk;
932 struct scsi_device *sdev = scsi_disk(disk)->device;
935 * If we are in the middle of error recovery, don't let anyone
936 * else try and use this device. Also, if error recovery fails, it
937 * may try and take the device offline, in which case all further
938 * access to the device is prohibited.
940 if (!scsi_block_when_processing_errors(sdev))
943 if (sdev->host->hostt->compat_ioctl) {
946 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
952 * Let the static ioctl translation table take care of it.
958 static struct block_device_operations sd_fops = {
959 .owner = THIS_MODULE,
961 .release = sd_release,
965 .compat_ioctl = sd_compat_ioctl,
967 .media_changed = sd_media_changed,
968 .revalidate_disk = sd_revalidate_disk,
971 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
973 u64 start_lba = scmd->request->sector;
974 u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512);
978 if (!blk_fs_request(scmd->request))
981 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
982 SCSI_SENSE_BUFFERSIZE,
987 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
990 if (scmd->device->sector_size < 512) {
991 /* only legitimate sector_size here is 256 */
995 /* be careful ... don't want any overflows */
996 u64 factor = scmd->device->sector_size / 512;
997 do_div(start_lba, factor);
998 do_div(end_lba, factor);
1001 /* The bad lba was reported incorrectly, we have no idea where
1004 if (bad_lba < start_lba || bad_lba >= end_lba)
1007 /* This computation should always be done in terms of
1008 * the resolution of the device's medium.
1010 return (bad_lba - start_lba) * scmd->device->sector_size;
1014 * sd_done - bottom half handler: called when the lower level
1015 * driver has completed (successfully or otherwise) a scsi command.
1016 * @SCpnt: mid-level's per command structure.
1018 * Note: potentially run from within an ISR. Must not block.
1020 static int sd_done(struct scsi_cmnd *SCpnt)
1022 int result = SCpnt->result;
1023 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1024 struct scsi_sense_hdr sshdr;
1025 int sense_valid = 0;
1026 int sense_deferred = 0;
1029 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1031 sense_deferred = scsi_sense_is_deferred(&sshdr);
1033 #ifdef CONFIG_SCSI_LOGGING
1034 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1036 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1037 "sd_done: sb[respc,sk,asc,"
1038 "ascq]=%x,%x,%x,%x\n",
1039 sshdr.response_code,
1040 sshdr.sense_key, sshdr.asc,
1044 if (driver_byte(result) != DRIVER_SENSE &&
1045 (!sense_valid || sense_deferred))
1048 switch (sshdr.sense_key) {
1049 case HARDWARE_ERROR:
1051 good_bytes = sd_completed_bytes(SCpnt);
1053 case RECOVERED_ERROR:
1055 /* Inform the user, but make sure that it's not treated
1058 scsi_print_sense("sd", SCpnt);
1060 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1061 good_bytes = scsi_bufflen(SCpnt);
1063 case ABORTED_COMMAND:
1064 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
1065 scsi_print_result(SCpnt);
1066 scsi_print_sense("sd", SCpnt);
1067 good_bytes = sd_completed_bytes(SCpnt);
1070 case ILLEGAL_REQUEST:
1071 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
1072 scsi_print_result(SCpnt);
1073 scsi_print_sense("sd", SCpnt);
1074 good_bytes = sd_completed_bytes(SCpnt);
1076 if (!scsi_device_protection(SCpnt->device) &&
1077 SCpnt->device->use_10_for_rw &&
1078 (SCpnt->cmnd[0] == READ_10 ||
1079 SCpnt->cmnd[0] == WRITE_10))
1080 SCpnt->device->use_10_for_rw = 0;
1081 if (SCpnt->device->use_10_for_ms &&
1082 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
1083 SCpnt->cmnd[0] == MODE_SELECT_10))
1084 SCpnt->device->use_10_for_ms = 0;
1090 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1091 sd_dif_complete(SCpnt, good_bytes);
1096 static int media_not_present(struct scsi_disk *sdkp,
1097 struct scsi_sense_hdr *sshdr)
1100 if (!scsi_sense_valid(sshdr))
1102 /* not invoked for commands that could return deferred errors */
1103 if (sshdr->sense_key != NOT_READY &&
1104 sshdr->sense_key != UNIT_ATTENTION)
1106 if (sshdr->asc != 0x3A) /* medium not present */
1109 set_media_not_present(sdkp);
1114 * spinup disk - called only in sd_revalidate_disk()
1117 sd_spinup_disk(struct scsi_disk *sdkp)
1119 unsigned char cmd[10];
1120 unsigned long spintime_expire = 0;
1121 int retries, spintime;
1122 unsigned int the_result;
1123 struct scsi_sense_hdr sshdr;
1124 int sense_valid = 0;
1128 /* Spin up drives, as required. Only do this at boot time */
1129 /* Spinup needs to be done for module loads too. */
1134 cmd[0] = TEST_UNIT_READY;
1135 memset((void *) &cmd[1], 0, 9);
1137 the_result = scsi_execute_req(sdkp->device, cmd,
1143 * If the drive has indicated to us that it
1144 * doesn't have any media in it, don't bother
1145 * with any more polling.
1147 if (media_not_present(sdkp, &sshdr))
1151 sense_valid = scsi_sense_valid(&sshdr);
1153 } while (retries < 3 &&
1154 (!scsi_status_is_good(the_result) ||
1155 ((driver_byte(the_result) & DRIVER_SENSE) &&
1156 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1158 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1159 /* no sense, TUR either succeeded or failed
1160 * with a status error */
1161 if(!spintime && !scsi_status_is_good(the_result)) {
1162 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1163 sd_print_result(sdkp, the_result);
1169 * The device does not want the automatic start to be issued.
1171 if (sdkp->device->no_start_on_add) {
1176 * If manual intervention is required, or this is an
1177 * absent USB storage device, a spinup is meaningless.
1180 sshdr.sense_key == NOT_READY &&
1181 sshdr.asc == 4 && sshdr.ascq == 3) {
1182 break; /* manual intervention required */
1185 * Issue command to spin up drive when not ready
1187 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1189 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1190 cmd[0] = START_STOP;
1191 cmd[1] = 1; /* Return immediately */
1192 memset((void *) &cmd[2], 0, 8);
1193 cmd[4] = 1; /* Start spin cycle */
1194 if (sdkp->device->start_stop_pwr_cond)
1196 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1198 SD_TIMEOUT, SD_MAX_RETRIES);
1199 spintime_expire = jiffies + 100 * HZ;
1202 /* Wait 1 second for next try */
1207 * Wait for USB flash devices with slow firmware.
1208 * Yes, this sense key/ASC combination shouldn't
1209 * occur here. It's characteristic of these devices.
1211 } else if (sense_valid &&
1212 sshdr.sense_key == UNIT_ATTENTION &&
1213 sshdr.asc == 0x28) {
1215 spintime_expire = jiffies + 5 * HZ;
1218 /* Wait 1 second for next try */
1221 /* we don't understand the sense code, so it's
1222 * probably pointless to loop */
1224 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1225 sd_print_sense_hdr(sdkp, &sshdr);
1230 } while (spintime && time_before_eq(jiffies, spintime_expire));
1233 if (scsi_status_is_good(the_result))
1236 printk("not responding...\n");
1242 * Determine whether disk supports Data Integrity Field.
1244 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1246 struct scsi_device *sdp = sdkp->device;
1249 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1252 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1255 case SD_DIF_TYPE0_PROTECTION:
1256 sdkp->protection_type = 0;
1259 case SD_DIF_TYPE1_PROTECTION:
1260 case SD_DIF_TYPE3_PROTECTION:
1261 sdkp->protection_type = type;
1264 case SD_DIF_TYPE2_PROTECTION:
1265 sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
1266 "protection which is currently unsupported. " \
1267 "Disabling disk!\n");
1271 sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
1272 "protection type %d. Disabling disk!\n", type);
1279 sdkp->protection_type = 0;
1284 * read disk capacity
1287 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1289 unsigned char cmd[16];
1290 int the_result, retries;
1291 int sector_size = 0;
1292 /* Force READ CAPACITY(16) when PROTECT=1 */
1293 int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
1294 struct scsi_sense_hdr sshdr;
1295 int sense_valid = 0;
1296 struct scsi_device *sdp = sdkp->device;
1302 memset((void *) cmd, 0, 16);
1303 cmd[0] = SERVICE_ACTION_IN;
1304 cmd[1] = SAI_READ_CAPACITY_16;
1306 memset((void *) buffer, 0, 13);
1308 cmd[0] = READ_CAPACITY;
1309 memset((void *) &cmd[1], 0, 9);
1310 memset((void *) buffer, 0, 8);
1313 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1314 buffer, longrc ? 13 : 8, &sshdr,
1315 SD_TIMEOUT, SD_MAX_RETRIES);
1317 if (media_not_present(sdkp, &sshdr))
1321 sense_valid = scsi_sense_valid(&sshdr);
1324 } while (the_result && retries);
1326 if (the_result && !longrc) {
1327 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1328 sd_print_result(sdkp, the_result);
1329 if (driver_byte(the_result) & DRIVER_SENSE)
1330 sd_print_sense_hdr(sdkp, &sshdr);
1332 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1334 /* Set dirty bit for removable devices if not ready -
1335 * sometimes drives will not report this properly. */
1336 if (sdp->removable &&
1337 sense_valid && sshdr.sense_key == NOT_READY)
1340 /* Either no media are present but the drive didn't tell us,
1341 or they are present but the read capacity command fails */
1342 /* sdkp->media_present = 0; -- not always correct */
1343 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1346 } else if (the_result && longrc) {
1347 /* READ CAPACITY(16) has been failed */
1348 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1349 sd_print_result(sdkp, the_result);
1350 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1352 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1357 sector_size = (buffer[4] << 24) |
1358 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1359 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1360 buffer[2] == 0xff && buffer[3] == 0xff) {
1361 if(sizeof(sdkp->capacity) > 4) {
1362 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1363 "Trying to use READ CAPACITY(16).\n");
1367 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1368 "a kernel compiled with support for large "
1369 "block devices.\n");
1373 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1378 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1379 ((u64)buffer[1] << 48) |
1380 ((u64)buffer[2] << 40) |
1381 ((u64)buffer[3] << 32) |
1382 ((sector_t)buffer[4] << 24) |
1383 ((sector_t)buffer[5] << 16) |
1384 ((sector_t)buffer[6] << 8) |
1385 (sector_t)buffer[7]);
1387 sector_size = (buffer[8] << 24) |
1388 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1390 sd_read_protection_type(sdkp, buffer);
1393 /* Some devices return the total number of sectors, not the
1394 * highest sector number. Make the necessary adjustment. */
1395 if (sdp->fix_capacity) {
1398 /* Some devices have version which report the correct sizes
1399 * and others which do not. We guess size according to a heuristic
1400 * and err on the side of lowering the capacity. */
1402 if (sdp->guess_capacity)
1403 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1408 if (sector_size == 0) {
1410 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1414 if (sector_size != 512 &&
1415 sector_size != 1024 &&
1416 sector_size != 2048 &&
1417 sector_size != 4096 &&
1418 sector_size != 256) {
1419 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1422 * The user might want to re-format the drive with
1423 * a supported sectorsize. Once this happens, it
1424 * would be relatively trivial to set the thing up.
1425 * For this reason, we leave the thing in the table.
1429 * set a bogus sector size so the normal read/write
1430 * logic in the block layer will eventually refuse any
1431 * request on this device without tripping over power
1432 * of two sector size assumptions
1438 * The msdos fs needs to know the hardware sector size
1439 * So I have created this table. See ll_rw_blk.c
1440 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1442 int hard_sector = sector_size;
1443 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
1444 struct request_queue *queue = sdp->request_queue;
1447 blk_queue_hardsect_size(queue, hard_sector);
1448 /* avoid 64-bit division on 32-bit platforms */
1449 sector_div(sz, 625);
1451 sector_div(mb, 1950);
1453 sd_printk(KERN_NOTICE, sdkp,
1454 "%llu %d-byte hardware sectors (%llu MB)\n",
1455 (unsigned long long)sdkp->capacity,
1456 hard_sector, (unsigned long long)mb);
1459 /* Rescale capacity to 512-byte units */
1460 if (sector_size == 4096)
1461 sdkp->capacity <<= 3;
1462 else if (sector_size == 2048)
1463 sdkp->capacity <<= 2;
1464 else if (sector_size == 1024)
1465 sdkp->capacity <<= 1;
1466 else if (sector_size == 256)
1467 sdkp->capacity >>= 1;
1469 sdkp->device->sector_size = sector_size;
1472 /* called with buffer of length 512 */
1474 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1475 unsigned char *buffer, int len, struct scsi_mode_data *data,
1476 struct scsi_sense_hdr *sshdr)
1478 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1479 SD_TIMEOUT, SD_MAX_RETRIES, data,
1484 * read write protect setting, if possible - called only in sd_revalidate_disk()
1485 * called with buffer of length SD_BUF_SIZE
1488 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1491 struct scsi_device *sdp = sdkp->device;
1492 struct scsi_mode_data data;
1494 set_disk_ro(sdkp->disk, 0);
1495 if (sdp->skip_ms_page_3f) {
1496 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1500 if (sdp->use_192_bytes_for_3f) {
1501 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1504 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1505 * We have to start carefully: some devices hang if we ask
1506 * for more than is available.
1508 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1511 * Second attempt: ask for page 0 When only page 0 is
1512 * implemented, a request for page 3F may return Sense Key
1513 * 5: Illegal Request, Sense Code 24: Invalid field in
1516 if (!scsi_status_is_good(res))
1517 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1520 * Third attempt: ask 255 bytes, as we did earlier.
1522 if (!scsi_status_is_good(res))
1523 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1527 if (!scsi_status_is_good(res)) {
1528 sd_printk(KERN_WARNING, sdkp,
1529 "Test WP failed, assume Write Enabled\n");
1531 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1532 set_disk_ro(sdkp->disk, sdkp->write_prot);
1533 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1534 sdkp->write_prot ? "on" : "off");
1535 sd_printk(KERN_DEBUG, sdkp,
1536 "Mode Sense: %02x %02x %02x %02x\n",
1537 buffer[0], buffer[1], buffer[2], buffer[3]);
1542 * sd_read_cache_type - called only from sd_revalidate_disk()
1543 * called with buffer of length SD_BUF_SIZE
1546 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1549 struct scsi_device *sdp = sdkp->device;
1553 struct scsi_mode_data data;
1554 struct scsi_sense_hdr sshdr;
1556 if (sdp->skip_ms_page_8)
1559 if (sdp->type == TYPE_RBC) {
1567 /* cautiously ask */
1568 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1570 if (!scsi_status_is_good(res))
1573 if (!data.header_length) {
1575 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1578 /* that went OK, now ask for the proper length */
1582 * We're only interested in the first three bytes, actually.
1583 * But the data cache page is defined for the first 20.
1590 /* Take headers and block descriptors into account */
1591 len += data.header_length + data.block_descriptor_length;
1592 if (len > SD_BUF_SIZE)
1596 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1598 if (scsi_status_is_good(res)) {
1599 int offset = data.header_length + data.block_descriptor_length;
1601 if (offset >= SD_BUF_SIZE - 2) {
1602 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1606 if ((buffer[offset] & 0x3f) != modepage) {
1607 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1611 if (modepage == 8) {
1612 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1613 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1615 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1619 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1620 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1621 sd_printk(KERN_NOTICE, sdkp,
1622 "Uses READ/WRITE(6), disabling FUA\n");
1626 sd_printk(KERN_NOTICE, sdkp,
1627 "Write cache: %s, read cache: %s, %s\n",
1628 sdkp->WCE ? "enabled" : "disabled",
1629 sdkp->RCD ? "disabled" : "enabled",
1630 sdkp->DPOFUA ? "supports DPO and FUA"
1631 : "doesn't support DPO or FUA");
1637 if (scsi_sense_valid(&sshdr) &&
1638 sshdr.sense_key == ILLEGAL_REQUEST &&
1639 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1640 /* Invalid field in CDB */
1641 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1643 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1646 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1653 * The ATO bit indicates whether the DIF application tag is available
1654 * for use by the operating system.
1656 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1659 struct scsi_device *sdp = sdkp->device;
1660 struct scsi_mode_data data;
1661 struct scsi_sense_hdr sshdr;
1663 if (sdp->type != TYPE_DISK)
1666 if (sdkp->protection_type == 0)
1669 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1670 SD_MAX_RETRIES, &data, &sshdr);
1672 if (!scsi_status_is_good(res) || !data.header_length ||
1674 sd_printk(KERN_WARNING, sdkp,
1675 "getting Control mode page failed, assume no ATO\n");
1677 if (scsi_sense_valid(&sshdr))
1678 sd_print_sense_hdr(sdkp, &sshdr);
1683 offset = data.header_length + data.block_descriptor_length;
1685 if ((buffer[offset] & 0x3f) != 0x0a) {
1686 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1690 if ((buffer[offset + 5] & 0x80) == 0)
1699 * sd_revalidate_disk - called the first time a new disk is seen,
1700 * performs disk spin up, read_capacity, etc.
1701 * @disk: struct gendisk we care about
1703 static int sd_revalidate_disk(struct gendisk *disk)
1705 struct scsi_disk *sdkp = scsi_disk(disk);
1706 struct scsi_device *sdp = sdkp->device;
1707 unsigned char *buffer;
1710 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1711 "sd_revalidate_disk\n"));
1714 * If the device is offline, don't try and read capacity or any
1715 * of the other niceties.
1717 if (!scsi_device_online(sdp))
1720 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1722 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1723 "allocation failure.\n");
1727 /* defaults, until the device tells us otherwise */
1728 sdp->sector_size = 512;
1730 sdkp->media_present = 1;
1731 sdkp->write_prot = 0;
1736 sd_spinup_disk(sdkp);
1739 * Without media there is no reason to ask; moreover, some devices
1740 * react badly if we do.
1742 if (sdkp->media_present) {
1743 sd_read_capacity(sdkp, buffer);
1744 sd_read_write_protect_flag(sdkp, buffer);
1745 sd_read_cache_type(sdkp, buffer);
1746 sd_read_app_tag_own(sdkp, buffer);
1750 * We now have all cache related info, determine how we deal
1751 * with ordered requests. Note that as the current SCSI
1752 * dispatch function can alter request order, we cannot use
1753 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1756 ordered = sdkp->DPOFUA
1757 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1759 ordered = QUEUE_ORDERED_DRAIN;
1761 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1763 set_capacity(disk, sdkp->capacity);
1771 * sd_format_disk_name - format disk name
1772 * @prefix: name prefix - ie. "sd" for SCSI disks
1773 * @index: index of the disk to format name for
1774 * @buf: output buffer
1775 * @buflen: length of the output buffer
1777 * SCSI disk names starts at sda. The 26th device is sdz and the
1778 * 27th is sdaa. The last one for two lettered suffix is sdzz
1779 * which is followed by sdaaa.
1781 * This is basically 26 base counting with one extra 'nil' entry
1782 * at the beggining from the second digit on and can be
1783 * determined using similar method as 26 base conversion with the
1784 * index shifted -1 after each digit is computed.
1790 * 0 on success, -errno on failure.
1792 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
1794 const int base = 'z' - 'a' + 1;
1795 char *begin = buf + strlen(prefix);
1796 char *end = buf + buflen;
1806 *--p = 'a' + (index % unit);
1807 index = (index / unit) - 1;
1808 } while (index >= 0);
1810 memmove(begin, p, end - p);
1811 memcpy(buf, prefix, strlen(prefix));
1817 * sd_probe - called during driver initialization and whenever a
1818 * new scsi device is attached to the system. It is called once
1819 * for each scsi device (not just disks) present.
1820 * @dev: pointer to device object
1822 * Returns 0 if successful (or not interested in this scsi device
1823 * (e.g. scanner)); 1 when there is an error.
1825 * Note: this function is invoked from the scsi mid-level.
1826 * This function sets up the mapping between a given
1827 * <host,channel,id,lun> (found in sdp) and new device name
1828 * (e.g. /dev/sda). More precisely it is the block device major
1829 * and minor number that is chosen here.
1831 * Assume sd_attach is not re-entrant (for time being)
1832 * Also think about sd_attach() and sd_remove() running coincidentally.
1834 static int sd_probe(struct device *dev)
1836 struct scsi_device *sdp = to_scsi_device(dev);
1837 struct scsi_disk *sdkp;
1843 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1846 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1850 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1854 gd = alloc_disk(SD_MINORS);
1859 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
1862 error = ida_get_new(&sd_index_ida, &index);
1863 } while (error == -EAGAIN);
1868 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
1870 goto out_free_index;
1873 sdkp->driver = &sd_template;
1875 sdkp->index = index;
1877 sdkp->previous_state = 1;
1879 if (!sdp->request_queue->rq_timeout) {
1880 if (sdp->type != TYPE_MOD)
1881 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
1883 blk_queue_rq_timeout(sdp->request_queue,
1887 device_initialize(&sdkp->dev);
1888 sdkp->dev.parent = &sdp->sdev_gendev;
1889 sdkp->dev.class = &sd_disk_class;
1890 strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1892 if (device_add(&sdkp->dev))
1893 goto out_free_index;
1895 get_device(&sdp->sdev_gendev);
1897 if (index < SD_MAX_DISKS) {
1898 gd->major = sd_major((index & 0xf0) >> 4);
1899 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1900 gd->minors = SD_MINORS;
1902 gd->fops = &sd_fops;
1903 gd->private_data = &sdkp->driver;
1904 gd->queue = sdkp->device->request_queue;
1906 sd_revalidate_disk(gd);
1908 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1910 gd->driverfs_dev = &sdp->sdev_gendev;
1911 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
1913 gd->flags |= GENHD_FL_REMOVABLE;
1915 dev_set_drvdata(dev, sdkp);
1917 sd_dif_config_host(sdkp);
1919 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1920 sdp->removable ? "removable " : "");
1925 ida_remove(&sd_index_ida, index);
1935 * sd_remove - called whenever a scsi disk (previously recognized by
1936 * sd_probe) is detached from the system. It is called (potentially
1937 * multiple times) during sd module unload.
1938 * @sdp: pointer to mid level scsi device object
1940 * Note: this function is invoked from the scsi mid-level.
1941 * This function potentially frees up a device name (e.g. /dev/sdc)
1942 * that could be re-used by a subsequent sd_probe().
1943 * This function is not called when the built-in sd driver is "exit-ed".
1945 static int sd_remove(struct device *dev)
1947 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1949 device_del(&sdkp->dev);
1950 del_gendisk(sdkp->disk);
1953 mutex_lock(&sd_ref_mutex);
1954 dev_set_drvdata(dev, NULL);
1955 put_device(&sdkp->dev);
1956 mutex_unlock(&sd_ref_mutex);
1962 * scsi_disk_release - Called to free the scsi_disk structure
1963 * @dev: pointer to embedded class device
1965 * sd_ref_mutex must be held entering this routine. Because it is
1966 * called on last put, you should always use the scsi_disk_get()
1967 * scsi_disk_put() helpers which manipulate the semaphore directly
1968 * and never do a direct put_device.
1970 static void scsi_disk_release(struct device *dev)
1972 struct scsi_disk *sdkp = to_scsi_disk(dev);
1973 struct gendisk *disk = sdkp->disk;
1975 ida_remove(&sd_index_ida, sdkp->index);
1977 disk->private_data = NULL;
1979 put_device(&sdkp->device->sdev_gendev);
1984 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1986 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1987 struct scsi_sense_hdr sshdr;
1988 struct scsi_device *sdp = sdkp->device;
1992 cmd[4] |= 1; /* START */
1994 if (sdp->start_stop_pwr_cond)
1995 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
1997 if (!scsi_device_online(sdp))
2000 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2001 SD_TIMEOUT, SD_MAX_RETRIES);
2003 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2004 sd_print_result(sdkp, res);
2005 if (driver_byte(res) & DRIVER_SENSE)
2006 sd_print_sense_hdr(sdkp, &sshdr);
2013 * Send a SYNCHRONIZE CACHE instruction down to the device through
2014 * the normal SCSI command structure. Wait for the command to
2017 static void sd_shutdown(struct device *dev)
2019 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2022 return; /* this can happen */
2025 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2026 sd_sync_cache(sdkp);
2029 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2030 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2031 sd_start_stop_device(sdkp, 0);
2034 scsi_disk_put(sdkp);
2037 static int sd_suspend(struct device *dev, pm_message_t mesg)
2039 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2043 return 0; /* this can happen */
2046 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2047 ret = sd_sync_cache(sdkp);
2052 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2053 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2054 ret = sd_start_stop_device(sdkp, 0);
2058 scsi_disk_put(sdkp);
2062 static int sd_resume(struct device *dev)
2064 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2067 if (!sdkp->device->manage_start_stop)
2070 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2071 ret = sd_start_stop_device(sdkp, 1);
2074 scsi_disk_put(sdkp);
2079 * init_sd - entry point for this driver (both when built in or when
2082 * Note: this function registers this driver with the scsi mid-level.
2084 static int __init init_sd(void)
2086 int majors = 0, i, err;
2088 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2090 for (i = 0; i < SD_MAJORS; i++)
2091 if (register_blkdev(sd_major(i), "sd") == 0)
2097 err = class_register(&sd_disk_class);
2101 err = scsi_register_driver(&sd_template.gendrv);
2108 class_unregister(&sd_disk_class);
2110 for (i = 0; i < SD_MAJORS; i++)
2111 unregister_blkdev(sd_major(i), "sd");
2116 * exit_sd - exit point for this driver (when it is a module).
2118 * Note: this function unregisters this driver from the scsi mid-level.
2120 static void __exit exit_sd(void)
2124 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2126 scsi_unregister_driver(&sd_template.gendrv);
2127 class_unregister(&sd_disk_class);
2129 for (i = 0; i < SD_MAJORS; i++)
2130 unregister_blkdev(sd_major(i), "sd");
2133 module_init(init_sd);
2134 module_exit(exit_sd);
2136 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2137 struct scsi_sense_hdr *sshdr)
2139 sd_printk(KERN_INFO, sdkp, "");
2140 scsi_show_sense_hdr(sshdr);
2141 sd_printk(KERN_INFO, sdkp, "");
2142 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2145 static void sd_print_result(struct scsi_disk *sdkp, int result)
2147 sd_printk(KERN_INFO, sdkp, "");
2148 scsi_show_result(result);