blob: 3dda77c31f504e50519232bbae9e7345381a3e28 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
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.
25 *
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.
33 */
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <linux/delay.h>
Arjan van de Ven0b950672006-01-11 13:16:10 +010049#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <asm/uaccess.h>
51
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#include <scsi/scsicam.h>
Martin K. Petersene73aec82007-02-27 22:40:55 -050061#include <scsi/sd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#include "scsi_logging.h"
64
Rene Hermanf018fa52006-03-08 00:14:20 -080065MODULE_AUTHOR("Eric Youngdale");
66MODULE_DESCRIPTION("SCSI disk (sd) driver");
67MODULE_LICENSE("GPL");
68
69MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
70MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
71MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
73MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086static DEFINE_IDR(sd_index_idr);
87static DEFINE_SPINLOCK(sd_index_lock);
88
89/* This semaphore is used to mediate the 0->1 reference get in the
90 * face of object destruction (i.e. we can't allow a get on an
91 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +010092static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
James Bottomley6bdaa1f2006-03-18 14:14:21 -060094static const char *sd_cache_types[] = {
95 "write through", "none", "write back",
96 "write back, no read (daft)"
97};
98
99static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
100 size_t count)
101{
102 int i, ct = -1, rcd, wce, sp;
103 struct scsi_disk *sdkp = to_scsi_disk(cdev);
104 struct scsi_device *sdp = sdkp->device;
105 char buffer[64];
106 char *buffer_data;
107 struct scsi_mode_data data;
108 struct scsi_sense_hdr sshdr;
109 int len;
110
111 if (sdp->type != TYPE_DISK)
112 /* no cache control on RBC devices; theoretically they
113 * can do it, but there's probably so many exceptions
114 * it's not worth the risk */
115 return -EINVAL;
116
Tobias Klauser6391a112006-06-08 22:23:48 -0700117 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600118 const int len = strlen(sd_cache_types[i]);
119 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
120 buf[len] == '\n') {
121 ct = i;
122 break;
123 }
124 }
125 if (ct < 0)
126 return -EINVAL;
127 rcd = ct & 0x01 ? 1 : 0;
128 wce = ct & 0x02 ? 1 : 0;
129 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
130 SD_MAX_RETRIES, &data, NULL))
131 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800132 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600133 data.block_descriptor_length);
134 buffer_data = buffer + data.header_length +
135 data.block_descriptor_length;
136 buffer_data[2] &= ~0x05;
137 buffer_data[2] |= wce << 2 | rcd;
138 sp = buffer_data[0] & 0x80 ? 1 : 0;
139
140 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
141 SD_MAX_RETRIES, &data, &sshdr)) {
142 if (scsi_sense_valid(&sshdr))
Martin K. Petersene73aec82007-02-27 22:40:55 -0500143 sd_print_sense_hdr(sdkp, &sshdr);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600144 return -EINVAL;
145 }
146 sd_revalidate_disk(sdkp->disk);
147 return count;
148}
149
Brian Kinga144c5a2006-06-27 11:10:31 -0500150static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf,
151 size_t count)
152{
153 struct scsi_disk *sdkp = to_scsi_disk(cdev);
154 struct scsi_device *sdp = sdkp->device;
155
156 if (!capable(CAP_SYS_ADMIN))
157 return -EACCES;
158
159 if (sdp->type != TYPE_DISK)
160 return -EINVAL;
161
162 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
163
164 return count;
165}
166
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600167static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
168{
169 struct scsi_disk *sdkp = to_scsi_disk(cdev);
170 int ct = sdkp->RCD + 2*sdkp->WCE;
171
172 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
173}
174
175static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
176{
177 struct scsi_disk *sdkp = to_scsi_disk(cdev);
178
179 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
180}
181
Brian Kinga144c5a2006-06-27 11:10:31 -0500182static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf)
183{
184 struct scsi_disk *sdkp = to_scsi_disk(cdev);
185
186 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
187}
188
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600189static struct class_device_attribute sd_disk_attrs[] = {
190 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
191 sd_store_cache_type),
192 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
Brian Kinga144c5a2006-06-27 11:10:31 -0500193 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
194 sd_store_allow_restart),
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600195 __ATTR_NULL,
196};
197
198static struct class sd_disk_class = {
199 .name = "scsi_disk",
200 .owner = THIS_MODULE,
201 .release = scsi_disk_release,
202 .class_dev_attrs = sd_disk_attrs,
203};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205static struct scsi_driver sd_template = {
206 .owner = THIS_MODULE,
207 .gendrv = {
208 .name = "sd",
209 .probe = sd_probe,
210 .remove = sd_remove,
211 .shutdown = sd_shutdown,
212 },
213 .rescan = sd_rescan,
214 .init_command = sd_init_command,
215 .issue_flush = sd_issue_flush,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216};
217
218/*
219 * Device no to disk mapping:
220 *
221 * major disc2 disc p1
222 * |............|.............|....|....| <- dev_t
223 * 31 20 19 8 7 4 3 0
224 *
225 * Inside a major, we have 16k disks, however mapped non-
226 * contiguously. The first 16 disks are for major0, the next
227 * ones with major1, ... Disk 256 is for major0 again, disk 272
228 * for major1, ...
229 * As we stay compatible with our numbering scheme, we can reuse
230 * the well-know SCSI majors 8, 65--71, 136--143.
231 */
232static int sd_major(int major_idx)
233{
234 switch (major_idx) {
235 case 0:
236 return SCSI_DISK0_MAJOR;
237 case 1 ... 7:
238 return SCSI_DISK1_MAJOR + major_idx - 1;
239 case 8 ... 15:
240 return SCSI_DISK8_MAJOR + major_idx - 8;
241 default:
242 BUG();
243 return 0; /* shut up gcc */
244 }
245}
246
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
248{
249 return container_of(disk->private_data, struct scsi_disk, driver);
250}
251
Alan Stern39b7f1e2005-11-04 14:44:41 -0500252static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
254 struct scsi_disk *sdkp = NULL;
255
Alan Stern39b7f1e2005-11-04 14:44:41 -0500256 if (disk->private_data) {
257 sdkp = scsi_disk(disk);
258 if (scsi_device_get(sdkp->device) == 0)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600259 class_device_get(&sdkp->cdev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500260 else
261 sdkp = NULL;
262 }
263 return sdkp;
264}
265
266static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
267{
268 struct scsi_disk *sdkp;
269
Arjan van de Ven0b950672006-01-11 13:16:10 +0100270 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500271 sdkp = __scsi_disk_get(disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100272 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 return sdkp;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500274}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Alan Stern39b7f1e2005-11-04 14:44:41 -0500276static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
277{
278 struct scsi_disk *sdkp;
279
Arjan van de Ven0b950672006-01-11 13:16:10 +0100280 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500281 sdkp = dev_get_drvdata(dev);
282 if (sdkp)
283 sdkp = __scsi_disk_get(sdkp->disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100284 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return sdkp;
286}
287
288static void scsi_disk_put(struct scsi_disk *sdkp)
289{
290 struct scsi_device *sdev = sdkp->device;
291
Arjan van de Ven0b950672006-01-11 13:16:10 +0100292 mutex_lock(&sd_ref_mutex);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600293 class_device_put(&sdkp->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100295 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298/**
299 * sd_init_command - build a scsi (read or write) command from
300 * information in the request structure.
301 * @SCpnt: pointer to mid-level's per scsi command structure that
302 * contains request and into which the scsi command is written
303 *
304 * Returns 1 if successful and 0 if error (or cannot be done now).
305 **/
306static int sd_init_command(struct scsi_cmnd * SCpnt)
307{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 struct scsi_device *sdp = SCpnt->device;
309 struct request *rq = SCpnt->request;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100310 struct gendisk *disk = rq->rq_disk;
311 sector_t block = rq->sector;
312 unsigned int this_count = SCpnt->request_bufflen >> 9;
313 unsigned int timeout = sdp->timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500315 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
316 "sd_init_command: block=%llu, "
317 "count=%d\n",
318 (unsigned long long)block,
319 this_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
321 if (!sdp || !scsi_device_online(sdp) ||
322 block + rq->nr_sectors > get_capacity(disk)) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500323 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
324 "Finishing %ld sectors\n",
325 rq->nr_sectors));
326 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
327 "Retry with 0x%p\n", SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 return 0;
329 }
330
331 if (sdp->changed) {
332 /*
333 * quietly refuse to do anything to a changed disc until
334 * the changed bit has been reset
335 */
336 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
337 return 0;
338 }
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500339 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
340 (unsigned long long)block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342 /*
343 * If we have a 1K hardware sectorsize, prevent access to single
344 * 512 byte sectors. In theory we could handle this - in fact
345 * the scsi cdrom driver must be able to handle this because
346 * we typically use 1K blocksizes, and cdroms typically have
347 * 2K hardware sectorsizes. Of course, things are simpler
348 * with the cdrom, since it is read-only. For performance
349 * reasons, the filesystems should be able to handle this
350 * and not force the scsi disk driver to use bounce buffers
351 * for this.
352 */
353 if (sdp->sector_size == 1024) {
354 if ((block & 1) || (rq->nr_sectors & 1)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500355 scmd_printk(KERN_ERR, SCpnt,
356 "Bad block number requested\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 return 0;
358 } else {
359 block = block >> 1;
360 this_count = this_count >> 1;
361 }
362 }
363 if (sdp->sector_size == 2048) {
364 if ((block & 3) || (rq->nr_sectors & 3)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500365 scmd_printk(KERN_ERR, SCpnt,
366 "Bad block number requested\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 return 0;
368 } else {
369 block = block >> 2;
370 this_count = this_count >> 2;
371 }
372 }
373 if (sdp->sector_size == 4096) {
374 if ((block & 7) || (rq->nr_sectors & 7)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500375 scmd_printk(KERN_ERR, SCpnt,
376 "Bad block number requested\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return 0;
378 } else {
379 block = block >> 3;
380 this_count = this_count >> 3;
381 }
382 }
383 if (rq_data_dir(rq) == WRITE) {
384 if (!sdp->writeable) {
385 return 0;
386 }
387 SCpnt->cmnd[0] = WRITE_6;
388 SCpnt->sc_data_direction = DMA_TO_DEVICE;
389 } else if (rq_data_dir(rq) == READ) {
390 SCpnt->cmnd[0] = READ_6;
391 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
392 } else {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500393 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 return 0;
395 }
396
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500397 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
398 "%s %d/%ld 512 byte blocks.\n",
399 (rq_data_dir(rq) == WRITE) ?
400 "writing" : "reading", this_count,
401 rq->nr_sectors));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403 SCpnt->cmnd[1] = 0;
404
405 if (block > 0xffffffff) {
406 SCpnt->cmnd[0] += READ_16 - READ_6;
Tejun Heo007365a2006-01-06 09:53:52 +0100407 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
409 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
410 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
411 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
412 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
413 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
414 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
415 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
416 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
417 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
418 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
419 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
420 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
421 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
422 SCpnt->device->use_10_for_rw) {
423 if (this_count > 0xffff)
424 this_count = 0xffff;
425
426 SCpnt->cmnd[0] += READ_10 - READ_6;
Tejun Heo007365a2006-01-06 09:53:52 +0100427 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
429 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
430 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
431 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
432 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
433 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
434 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
435 } else {
Tejun Heo007365a2006-01-06 09:53:52 +0100436 if (unlikely(blk_fua_rq(rq))) {
437 /*
438 * This happens only if this drive failed
439 * 10byte rw command with ILLEGAL_REQUEST
440 * during operation and thus turned off
441 * use_10_for_rw.
442 */
Martin K. Petersene73aec82007-02-27 22:40:55 -0500443 scmd_printk(KERN_ERR, SCpnt,
444 "FUA write on READ/WRITE(6) drive\n");
Tejun Heo007365a2006-01-06 09:53:52 +0100445 return 0;
446 }
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
449 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
450 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
451 SCpnt->cmnd[4] = (unsigned char) this_count;
452 SCpnt->cmnd[5] = 0;
453 }
Christoph Hellwig631c2282006-07-08 20:42:15 +0200454 SCpnt->request_bufflen = this_count * sdp->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456 /*
457 * We shouldn't disconnect in the middle of a sector, so with a dumb
458 * host adapter, it's safe to assume that we can at least transfer
459 * this many bytes between each connect / disconnect.
460 */
461 SCpnt->transfersize = sdp->sector_size;
462 SCpnt->underflow = this_count << 9;
463 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 SCpnt->timeout_per_command = timeout;
465
466 /*
467 * This is the completion routine we use. This is matched in terms
468 * of capability to this function.
469 */
470 SCpnt->done = sd_rw_intr;
471
472 /*
473 * This indicates that the command is ready from our end to be
474 * queued.
475 */
476 return 1;
477}
478
479/**
480 * sd_open - open a scsi disk device
481 * @inode: only i_rdev member may be used
482 * @filp: only f_mode and f_flags may be used
483 *
484 * Returns 0 if successful. Returns a negated errno value in case
485 * of error.
486 *
487 * Note: This can be called from a user context (e.g. fsck(1) )
488 * or from within the kernel (e.g. as a result of a mount(1) ).
489 * In the latter case @inode and @filp carry an abridged amount
490 * of information as noted above.
491 **/
492static int sd_open(struct inode *inode, struct file *filp)
493{
494 struct gendisk *disk = inode->i_bdev->bd_disk;
495 struct scsi_disk *sdkp;
496 struct scsi_device *sdev;
497 int retval;
498
499 if (!(sdkp = scsi_disk_get(disk)))
500 return -ENXIO;
501
502
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500503 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 sdev = sdkp->device;
506
507 /*
508 * If the device is in error recovery, wait until it is done.
509 * If the device is offline, then disallow any access to it.
510 */
511 retval = -ENXIO;
512 if (!scsi_block_when_processing_errors(sdev))
513 goto error_out;
514
515 if (sdev->removable || sdkp->write_prot)
516 check_disk_change(inode->i_bdev);
517
518 /*
519 * If the drive is empty, just let the open fail.
520 */
521 retval = -ENOMEDIUM;
522 if (sdev->removable && !sdkp->media_present &&
523 !(filp->f_flags & O_NDELAY))
524 goto error_out;
525
526 /*
527 * If the device has the write protect tab set, have the open fail
528 * if the user expects to be able to write to the thing.
529 */
530 retval = -EROFS;
531 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
532 goto error_out;
533
534 /*
535 * It is possible that the disk changing stuff resulted in
536 * the device being taken offline. If this is the case,
537 * report this to the user, and don't pretend that the
538 * open actually succeeded.
539 */
540 retval = -ENXIO;
541 if (!scsi_device_online(sdev))
542 goto error_out;
543
544 if (!sdkp->openers++ && sdev->removable) {
545 if (scsi_block_when_processing_errors(sdev))
546 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
547 }
548
549 return 0;
550
551error_out:
552 scsi_disk_put(sdkp);
553 return retval;
554}
555
556/**
557 * sd_release - invoked when the (last) close(2) is called on this
558 * scsi disk.
559 * @inode: only i_rdev member may be used
560 * @filp: only f_mode and f_flags may be used
561 *
562 * Returns 0.
563 *
564 * Note: may block (uninterruptible) if error recovery is underway
565 * on this disk.
566 **/
567static int sd_release(struct inode *inode, struct file *filp)
568{
569 struct gendisk *disk = inode->i_bdev->bd_disk;
570 struct scsi_disk *sdkp = scsi_disk(disk);
571 struct scsi_device *sdev = sdkp->device;
572
James Bottomley56937f72007-03-11 12:25:33 -0500573 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575 if (!--sdkp->openers && sdev->removable) {
576 if (scsi_block_when_processing_errors(sdev))
577 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
578 }
579
580 /*
581 * XXX and what if there are packets in flight and this close()
582 * XXX is followed by a "rmmod sd_mod"?
583 */
584 scsi_disk_put(sdkp);
585 return 0;
586}
587
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800588static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
590 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
591 struct scsi_device *sdp = sdkp->device;
592 struct Scsi_Host *host = sdp->host;
593 int diskinfo[4];
594
595 /* default to most commonly used values */
596 diskinfo[0] = 0x40; /* 1 << 6 */
597 diskinfo[1] = 0x20; /* 1 << 5 */
598 diskinfo[2] = sdkp->capacity >> 11;
599
600 /* override with calculated, extended default, or driver values */
601 if (host->hostt->bios_param)
602 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
603 else
604 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
605
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800606 geo->heads = diskinfo[0];
607 geo->sectors = diskinfo[1];
608 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 return 0;
610}
611
612/**
613 * sd_ioctl - process an ioctl
614 * @inode: only i_rdev/i_bdev members may be used
615 * @filp: only f_mode and f_flags may be used
616 * @cmd: ioctl command number
617 * @arg: this is third argument given to ioctl(2) system call.
618 * Often contains a pointer.
619 *
620 * Returns 0 if successful (some ioctls return postive numbers on
621 * success as well). Returns a negated errno value in case of error.
622 *
623 * Note: most ioctls are forward onto the block subsystem or further
624 * down in the scsi subsytem.
625 **/
626static int sd_ioctl(struct inode * inode, struct file * filp,
627 unsigned int cmd, unsigned long arg)
628{
629 struct block_device *bdev = inode->i_bdev;
630 struct gendisk *disk = bdev->bd_disk;
631 struct scsi_device *sdp = scsi_disk(disk)->device;
632 void __user *p = (void __user *)arg;
633 int error;
634
635 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
636 disk->disk_name, cmd));
637
638 /*
639 * If we are in the middle of error recovery, don't let anyone
640 * else try and use this device. Also, if error recovery fails, it
641 * may try and take the device offline, in which case all further
642 * access to the device is prohibited.
643 */
644 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
645 if (!scsi_block_when_processing_errors(sdp) || !error)
646 return error;
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 /*
649 * Send SCSI addressing ioctls directly to mid level, send other
650 * ioctls to block level and then onto mid level if they can't be
651 * resolved.
652 */
653 switch (cmd) {
654 case SCSI_IOCTL_GET_IDLUN:
655 case SCSI_IOCTL_GET_BUS_NUMBER:
656 return scsi_ioctl(sdp, cmd, p);
657 default:
658 error = scsi_cmd_ioctl(filp, disk, cmd, p);
659 if (error != -ENOTTY)
660 return error;
661 }
662 return scsi_ioctl(sdp, cmd, p);
663}
664
665static void set_media_not_present(struct scsi_disk *sdkp)
666{
667 sdkp->media_present = 0;
668 sdkp->capacity = 0;
669 sdkp->device->changed = 1;
670}
671
672/**
673 * sd_media_changed - check if our medium changed
674 * @disk: kernel device descriptor
675 *
676 * Returns 0 if not applicable or no change; 1 if change
677 *
678 * Note: this function is invoked from the block subsystem.
679 **/
680static int sd_media_changed(struct gendisk *disk)
681{
682 struct scsi_disk *sdkp = scsi_disk(disk);
683 struct scsi_device *sdp = sdkp->device;
684 int retval;
685
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500686 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
688 if (!sdp->removable)
689 return 0;
690
691 /*
692 * If the device is offline, don't send any commands - just pretend as
693 * if the command failed. If the device ever comes back online, we
694 * can deal with it then. It is only because of unrecoverable errors
695 * that we would ever take a device offline in the first place.
696 */
697 if (!scsi_device_online(sdp))
698 goto not_present;
699
700 /*
701 * Using TEST_UNIT_READY enables differentiation between drive with
702 * no cartridge loaded - NOT READY, drive with changed cartridge -
703 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
704 *
705 * Drives that auto spin down. eg iomega jaz 1G, will be started
706 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
707 * sd_revalidate() is called.
708 */
709 retval = -ENODEV;
710 if (scsi_block_when_processing_errors(sdp))
711 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
712
713 /*
714 * Unable to test, unit probably not ready. This usually
715 * means there is no disc in the drive. Mark as changed,
716 * and we will figure it out later once the drive is
717 * available again.
718 */
719 if (retval)
720 goto not_present;
721
722 /*
723 * For removable scsi disk we have to recognise the presence
724 * of a disk in the drive. This is kept in the struct scsi_disk
725 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
726 */
727 sdkp->media_present = 1;
728
729 retval = sdp->changed;
730 sdp->changed = 0;
731
732 return retval;
733
734not_present:
735 set_media_not_present(sdkp);
736 return 1;
737}
738
Martin K. Petersene73aec82007-02-27 22:40:55 -0500739static int sd_sync_cache(struct scsi_disk *sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 int retries, res;
Martin K. Petersene73aec82007-02-27 22:40:55 -0500742 struct scsi_device *sdp = sdkp->device;
James Bottomleyea73a9f2005-08-28 11:33:52 -0500743 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
745 if (!scsi_device_online(sdp))
746 return -ENODEV;
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 for (retries = 3; retries > 0; --retries) {
750 unsigned char cmd[10] = { 0 };
751
752 cmd[0] = SYNCHRONIZE_CACHE;
753 /*
754 * Leave the rest of the command zero to indicate
755 * flush everything.
756 */
James Bottomleyea73a9f2005-08-28 11:33:52 -0500757 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
758 SD_TIMEOUT, SD_MAX_RETRIES);
759 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 break;
761 }
762
Martin K. Petersene73aec82007-02-27 22:40:55 -0500763 if (res) {
764 sd_print_result(sdkp, res);
765 if (driver_byte(res) & DRIVER_SENSE)
766 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 }
768
Tejun Heo37210502007-03-21 00:07:18 +0900769 if (res)
770 return -EIO;
771 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}
773
774static int sd_issue_flush(struct device *dev, sector_t *error_sector)
775{
Alan Stern39b7f1e2005-11-04 14:44:41 -0500776 int ret = 0;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500777 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
779 if (!sdkp)
780 return -ENODEV;
781
Alan Stern39b7f1e2005-11-04 14:44:41 -0500782 if (sdkp->WCE)
Martin K. Petersene73aec82007-02-27 22:40:55 -0500783 ret = sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500784 scsi_disk_put(sdkp);
785 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786}
787
Tejun Heo461d4e92006-01-06 09:52:55 +0100788static void sd_prepare_flush(request_queue_t *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789{
James Bottomleyc0ed79a2005-11-08 09:21:07 -0500790 memset(rq->cmd, 0, sizeof(rq->cmd));
Jens Axboe4aff5e22006-08-10 08:44:47 +0200791 rq->cmd_type = REQ_TYPE_BLOCK_PC;
James Bottomleyc0ed79a2005-11-08 09:21:07 -0500792 rq->timeout = SD_TIMEOUT;
793 rq->cmd[0] = SYNCHRONIZE_CACHE;
Tejun Heo461d4e92006-01-06 09:52:55 +0100794 rq->cmd_len = 10;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795}
796
797static void sd_rescan(struct device *dev)
798{
Alan Stern39b7f1e2005-11-04 14:44:41 -0500799 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
800
801 if (sdkp) {
802 sd_revalidate_disk(sdkp->disk);
803 scsi_disk_put(sdkp);
804 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805}
806
807
808#ifdef CONFIG_COMPAT
809/*
810 * This gets directly called from VFS. When the ioctl
811 * is not recognized we go back to the other translation paths.
812 */
813static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
814{
Josef Sipek7ac62072006-12-08 02:37:37 -0800815 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 struct gendisk *disk = bdev->bd_disk;
817 struct scsi_device *sdev = scsi_disk(disk)->device;
818
819 /*
820 * If we are in the middle of error recovery, don't let anyone
821 * else try and use this device. Also, if error recovery fails, it
822 * may try and take the device offline, in which case all further
823 * access to the device is prohibited.
824 */
825 if (!scsi_block_when_processing_errors(sdev))
826 return -ENODEV;
827
828 if (sdev->host->hostt->compat_ioctl) {
829 int ret;
830
831 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
832
833 return ret;
834 }
835
836 /*
837 * Let the static ioctl translation table take care of it.
838 */
839 return -ENOIOCTLCMD;
840}
841#endif
842
843static struct block_device_operations sd_fops = {
844 .owner = THIS_MODULE,
845 .open = sd_open,
846 .release = sd_release,
847 .ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800848 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849#ifdef CONFIG_COMPAT
850 .compat_ioctl = sd_compat_ioctl,
851#endif
852 .media_changed = sd_media_changed,
853 .revalidate_disk = sd_revalidate_disk,
854};
855
856/**
857 * sd_rw_intr - bottom half handler: called when the lower level
858 * driver has completed (successfully or otherwise) a scsi command.
859 * @SCpnt: mid-level's per command structure.
860 *
861 * Note: potentially run from within an ISR. Must not block.
862 **/
863static void sd_rw_intr(struct scsi_cmnd * SCpnt)
864{
865 int result = SCpnt->result;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700866 unsigned int xfer_size = SCpnt->request_bufflen;
867 unsigned int good_bytes = result ? 0 : xfer_size;
868 u64 start_lba = SCpnt->request->sector;
869 u64 bad_lba;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 struct scsi_sense_hdr sshdr;
871 int sense_valid = 0;
872 int sense_deferred = 0;
873 int info_valid;
874
875 if (result) {
876 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
877 if (sense_valid)
878 sense_deferred = scsi_sense_is_deferred(&sshdr);
879 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880#ifdef CONFIG_SCSI_LOGGING
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500881 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 if (sense_valid) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500883 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
884 "sd_rw_intr: sb[respc,sk,asc,"
885 "ascq]=%x,%x,%x,%x\n",
886 sshdr.response_code,
887 sshdr.sense_key, sshdr.asc,
888 sshdr.ascq));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 }
890#endif
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700891 if (driver_byte(result) != DRIVER_SENSE &&
892 (!sense_valid || sense_deferred))
893 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700895 switch (sshdr.sense_key) {
896 case HARDWARE_ERROR:
897 case MEDIUM_ERROR:
898 if (!blk_fs_request(SCpnt->request))
899 goto out;
900 info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer,
901 SCSI_SENSE_BUFFERSIZE,
902 &bad_lba);
903 if (!info_valid)
904 goto out;
905 if (xfer_size <= SCpnt->device->sector_size)
906 goto out;
907 switch (SCpnt->device->sector_size) {
908 case 256:
909 start_lba <<= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700911 case 512:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700913 case 1024:
914 start_lba >>= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700916 case 2048:
917 start_lba >>= 2;
918 break;
919 case 4096:
920 start_lba >>= 3;
921 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 default:
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700923 /* Print something here with limiting frequency. */
924 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 break;
926 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700927 /* This computation should always be done in terms of
928 * the resolution of the device's medium.
929 */
930 good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size;
931 break;
932 case RECOVERED_ERROR:
933 case NO_SENSE:
934 /* Inform the user, but make sure that it's not treated
935 * as a hard error.
936 */
937 scsi_print_sense("sd", SCpnt);
938 SCpnt->result = 0;
939 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
940 good_bytes = xfer_size;
941 break;
942 case ILLEGAL_REQUEST:
943 if (SCpnt->device->use_10_for_rw &&
944 (SCpnt->cmnd[0] == READ_10 ||
945 SCpnt->cmnd[0] == WRITE_10))
946 SCpnt->device->use_10_for_rw = 0;
947 if (SCpnt->device->use_10_for_ms &&
948 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
949 SCpnt->cmnd[0] == MODE_SELECT_10))
950 SCpnt->device->use_10_for_ms = 0;
951 break;
952 default:
953 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -0700955 out:
956 scsi_io_completion(SCpnt, good_bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957}
958
James Bottomleyea73a9f2005-08-28 11:33:52 -0500959static int media_not_present(struct scsi_disk *sdkp,
960 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
James Bottomleyea73a9f2005-08-28 11:33:52 -0500963 if (!scsi_sense_valid(sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 return 0;
965 /* not invoked for commands that could return deferred errors */
James Bottomleyea73a9f2005-08-28 11:33:52 -0500966 if (sshdr->sense_key != NOT_READY &&
967 sshdr->sense_key != UNIT_ATTENTION)
968 return 0;
969 if (sshdr->asc != 0x3A) /* medium not present */
970 return 0;
971
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 set_media_not_present(sdkp);
973 return 1;
974}
975
976/*
977 * spinup disk - called only in sd_revalidate_disk()
978 */
979static void
Martin K. Petersene73aec82007-02-27 22:40:55 -0500980sd_spinup_disk(struct scsi_disk *sdkp)
James Bottomleyea73a9f2005-08-28 11:33:52 -0500981{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -0400983 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 int retries, spintime;
985 unsigned int the_result;
986 struct scsi_sense_hdr sshdr;
987 int sense_valid = 0;
988
989 spintime = 0;
990
991 /* Spin up drives, as required. Only do this at boot time */
992 /* Spinup needs to be done for module loads too. */
993 do {
994 retries = 0;
995
996 do {
997 cmd[0] = TEST_UNIT_READY;
998 memset((void *) &cmd[1], 0, 9);
999
James Bottomleyea73a9f2005-08-28 11:33:52 -05001000 the_result = scsi_execute_req(sdkp->device, cmd,
1001 DMA_NONE, NULL, 0,
1002 &sshdr, SD_TIMEOUT,
1003 SD_MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
Alan Sternb4d38e32006-10-11 16:48:28 -04001005 /*
1006 * If the drive has indicated to us that it
1007 * doesn't have any media in it, don't bother
1008 * with any more polling.
1009 */
1010 if (media_not_present(sdkp, &sshdr))
1011 return;
1012
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001014 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 retries++;
1016 } while (retries < 3 &&
1017 (!scsi_status_is_good(the_result) ||
1018 ((driver_byte(the_result) & DRIVER_SENSE) &&
1019 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1020
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1022 /* no sense, TUR either succeeded or failed
1023 * with a status error */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001024 if(!spintime && !scsi_status_is_good(the_result)) {
1025 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1026 sd_print_result(sdkp, the_result);
1027 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 break;
1029 }
1030
1031 /*
1032 * The device does not want the automatic start to be issued.
1033 */
1034 if (sdkp->device->no_start_on_add) {
1035 break;
1036 }
1037
1038 /*
1039 * If manual intervention is required, or this is an
1040 * absent USB storage device, a spinup is meaningless.
1041 */
1042 if (sense_valid &&
1043 sshdr.sense_key == NOT_READY &&
1044 sshdr.asc == 4 && sshdr.ascq == 3) {
1045 break; /* manual intervention required */
1046
1047 /*
1048 * Issue command to spin up drive when not ready
1049 */
1050 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1051 if (!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001052 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 cmd[0] = START_STOP;
1054 cmd[1] = 1; /* Return immediately */
1055 memset((void *) &cmd[2], 0, 8);
1056 cmd[4] = 1; /* Start spin cycle */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001057 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1058 NULL, 0, &sshdr,
1059 SD_TIMEOUT, SD_MAX_RETRIES);
Alan Stern4451e472005-07-12 10:45:17 -04001060 spintime_expire = jiffies + 100 * HZ;
1061 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 /* Wait 1 second for next try */
1064 msleep(1000);
1065 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001066
1067 /*
1068 * Wait for USB flash devices with slow firmware.
1069 * Yes, this sense key/ASC combination shouldn't
1070 * occur here. It's characteristic of these devices.
1071 */
1072 } else if (sense_valid &&
1073 sshdr.sense_key == UNIT_ATTENTION &&
1074 sshdr.asc == 0x28) {
1075 if (!spintime) {
1076 spintime_expire = jiffies + 5 * HZ;
1077 spintime = 1;
1078 }
1079 /* Wait 1 second for next try */
1080 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 } else {
1082 /* we don't understand the sense code, so it's
1083 * probably pointless to loop */
1084 if(!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001085 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1086 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 }
1088 break;
1089 }
1090
Alan Stern4451e472005-07-12 10:45:17 -04001091 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
1093 if (spintime) {
1094 if (scsi_status_is_good(the_result))
1095 printk("ready\n");
1096 else
1097 printk("not responding...\n");
1098 }
1099}
1100
1101/*
1102 * read disk capacity
1103 */
1104static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001105sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001106{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 int the_result, retries;
1109 int sector_size = 0;
1110 int longrc = 0;
1111 struct scsi_sense_hdr sshdr;
1112 int sense_valid = 0;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001113 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115repeat:
1116 retries = 3;
1117 do {
1118 if (longrc) {
1119 memset((void *) cmd, 0, 16);
1120 cmd[0] = SERVICE_ACTION_IN;
1121 cmd[1] = SAI_READ_CAPACITY_16;
1122 cmd[13] = 12;
1123 memset((void *) buffer, 0, 12);
1124 } else {
1125 cmd[0] = READ_CAPACITY;
1126 memset((void *) &cmd[1], 0, 9);
1127 memset((void *) buffer, 0, 8);
1128 }
1129
James Bottomleyea73a9f2005-08-28 11:33:52 -05001130 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1131 buffer, longrc ? 12 : 8, &sshdr,
1132 SD_TIMEOUT, SD_MAX_RETRIES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
James Bottomleyea73a9f2005-08-28 11:33:52 -05001134 if (media_not_present(sdkp, &sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 return;
1136
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001138 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 retries--;
1140
1141 } while (the_result && retries);
1142
1143 if (the_result && !longrc) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001144 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1145 sd_print_result(sdkp, the_result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 if (driver_byte(the_result) & DRIVER_SENSE)
Martin K. Petersene73aec82007-02-27 22:40:55 -05001147 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05001149 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150
1151 /* Set dirty bit for removable devices if not ready -
1152 * sometimes drives will not report this properly. */
1153 if (sdp->removable &&
1154 sense_valid && sshdr.sense_key == NOT_READY)
1155 sdp->changed = 1;
1156
1157 /* Either no media are present but the drive didn't tell us,
1158 or they are present but the read capacity command fails */
1159 /* sdkp->media_present = 0; -- not always correct */
Hannes Reinecke69bdd882006-09-01 15:50:23 +02001160 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
1162 return;
1163 } else if (the_result && longrc) {
1164 /* READ CAPACITY(16) has been failed */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001165 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1166 sd_print_result(sdkp, the_result);
1167 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1168
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1170 goto got_data;
1171 }
1172
1173 if (!longrc) {
1174 sector_size = (buffer[4] << 24) |
1175 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1176 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1177 buffer[2] == 0xff && buffer[3] == 0xff) {
1178 if(sizeof(sdkp->capacity) > 4) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001179 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1180 "Trying to use READ CAPACITY(16).\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 longrc = 1;
1182 goto repeat;
1183 }
Martin K. Petersene73aec82007-02-27 22:40:55 -05001184 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1185 "a kernel compiled with support for large "
1186 "block devices.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 sdkp->capacity = 0;
1188 goto got_data;
1189 }
1190 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1191 (buffer[1] << 16) |
1192 (buffer[2] << 8) |
1193 buffer[3]);
1194 } else {
1195 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1196 ((u64)buffer[1] << 48) |
1197 ((u64)buffer[2] << 40) |
1198 ((u64)buffer[3] << 32) |
1199 ((sector_t)buffer[4] << 24) |
1200 ((sector_t)buffer[5] << 16) |
1201 ((sector_t)buffer[6] << 8) |
1202 (sector_t)buffer[7]);
1203
1204 sector_size = (buffer[8] << 24) |
1205 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1206 }
1207
1208 /* Some devices return the total number of sectors, not the
1209 * highest sector number. Make the necessary adjustment. */
Oliver Neukum61bf54b2007-02-08 09:04:48 +01001210 if (sdp->fix_capacity) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 --sdkp->capacity;
1212
Oliver Neukum61bf54b2007-02-08 09:04:48 +01001213 /* Some devices have version which report the correct sizes
1214 * and others which do not. We guess size according to a heuristic
1215 * and err on the side of lowering the capacity. */
1216 } else {
1217 if (sdp->guess_capacity)
1218 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1219 --sdkp->capacity;
1220 }
1221
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222got_data:
1223 if (sector_size == 0) {
1224 sector_size = 512;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001225 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1226 "assuming 512.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 }
1228
1229 if (sector_size != 512 &&
1230 sector_size != 1024 &&
1231 sector_size != 2048 &&
1232 sector_size != 4096 &&
1233 sector_size != 256) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001234 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1235 sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 /*
1237 * The user might want to re-format the drive with
1238 * a supported sectorsize. Once this happens, it
1239 * would be relatively trivial to set the thing up.
1240 * For this reason, we leave the thing in the table.
1241 */
1242 sdkp->capacity = 0;
1243 /*
1244 * set a bogus sector size so the normal read/write
1245 * logic in the block layer will eventually refuse any
1246 * request on this device without tripping over power
1247 * of two sector size assumptions
1248 */
1249 sector_size = 512;
1250 }
1251 {
1252 /*
1253 * The msdos fs needs to know the hardware sector size
1254 * So I have created this table. See ll_rw_blk.c
1255 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1256 */
1257 int hard_sector = sector_size;
James Bottomley7a691bd2005-10-28 13:17:30 -05001258 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 request_queue_t *queue = sdp->request_queue;
James Bottomley7a691bd2005-10-28 13:17:30 -05001260 sector_t mb = sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261
1262 blk_queue_hardsect_size(queue, hard_sector);
1263 /* avoid 64-bit division on 32-bit platforms */
James Bottomley7a691bd2005-10-28 13:17:30 -05001264 sector_div(sz, 625);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 mb -= sz - 974;
1266 sector_div(mb, 1950);
1267
Martin K. Petersene73aec82007-02-27 22:40:55 -05001268 sd_printk(KERN_NOTICE, sdkp,
1269 "%llu %d-byte hardware sectors (%llu MB)\n",
1270 (unsigned long long)sdkp->capacity,
1271 hard_sector, (unsigned long long)mb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 }
1273
1274 /* Rescale capacity to 512-byte units */
1275 if (sector_size == 4096)
1276 sdkp->capacity <<= 3;
1277 else if (sector_size == 2048)
1278 sdkp->capacity <<= 2;
1279 else if (sector_size == 1024)
1280 sdkp->capacity <<= 1;
1281 else if (sector_size == 256)
1282 sdkp->capacity >>= 1;
1283
1284 sdkp->device->sector_size = sector_size;
1285}
1286
1287/* called with buffer of length 512 */
1288static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05001289sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1290 unsigned char *buffer, int len, struct scsi_mode_data *data,
1291 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292{
James Bottomleyea73a9f2005-08-28 11:33:52 -05001293 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05001294 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001295 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296}
1297
1298/*
1299 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001300 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 */
1302static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001303sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001304{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001306 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 struct scsi_mode_data data;
1308
1309 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001310 if (sdp->skip_ms_page_3f) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001311 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 return;
1313 }
1314
James Bottomleyea73a9f2005-08-28 11:33:52 -05001315 if (sdp->use_192_bytes_for_3f) {
1316 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 } else {
1318 /*
1319 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1320 * We have to start carefully: some devices hang if we ask
1321 * for more than is available.
1322 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001323 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
1325 /*
1326 * Second attempt: ask for page 0 When only page 0 is
1327 * implemented, a request for page 3F may return Sense Key
1328 * 5: Illegal Request, Sense Code 24: Invalid field in
1329 * CDB.
1330 */
1331 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001332 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
1334 /*
1335 * Third attempt: ask 255 bytes, as we did earlier.
1336 */
1337 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001338 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1339 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 }
1341
1342 if (!scsi_status_is_good(res)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001343 sd_printk(KERN_WARNING, sdkp,
1344 "Test WP failed, assume Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 } else {
1346 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1347 set_disk_ro(sdkp->disk, sdkp->write_prot);
Martin K. Petersene73aec82007-02-27 22:40:55 -05001348 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1349 sdkp->write_prot ? "on" : "off");
1350 sd_printk(KERN_DEBUG, sdkp,
1351 "Mode Sense: %02x %02x %02x %02x\n",
1352 buffer[0], buffer[1], buffer[2], buffer[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 }
1354}
1355
1356/*
1357 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001358 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 */
1360static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001361sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01001362{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001364 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
Al Viro 631e8a12005-05-16 01:59:55 +01001366 int dbd;
1367 int modepage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 struct scsi_mode_data data;
1369 struct scsi_sense_hdr sshdr;
1370
James Bottomleyea73a9f2005-08-28 11:33:52 -05001371 if (sdp->skip_ms_page_8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 goto defaults;
1373
James Bottomleyea73a9f2005-08-28 11:33:52 -05001374 if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01001375 modepage = 6;
1376 dbd = 8;
1377 } else {
1378 modepage = 8;
1379 dbd = 0;
1380 }
1381
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 /* cautiously ask */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001383 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
1385 if (!scsi_status_is_good(res))
1386 goto bad_sense;
1387
Al Viro6d73c852006-02-23 02:03:16 +01001388 if (!data.header_length) {
1389 modepage = 6;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001390 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
Al Viro6d73c852006-02-23 02:03:16 +01001391 }
1392
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 /* that went OK, now ask for the proper length */
1394 len = data.length;
1395
1396 /*
1397 * We're only interested in the first three bytes, actually.
1398 * But the data cache page is defined for the first 20.
1399 */
1400 if (len < 3)
1401 goto bad_sense;
1402 if (len > 20)
1403 len = 20;
1404
1405 /* Take headers and block descriptors into account */
1406 len += data.header_length + data.block_descriptor_length;
Al Viro48970802006-02-26 08:34:10 -06001407 if (len > SD_BUF_SIZE)
1408 goto bad_sense;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
1410 /* Get the data */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001411 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
1413 if (scsi_status_is_good(res)) {
Al Viro 631e8a12005-05-16 01:59:55 +01001414 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
Al Viro48970802006-02-26 08:34:10 -06001416 if (offset >= SD_BUF_SIZE - 2) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001417 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
Al Viro48970802006-02-26 08:34:10 -06001418 goto defaults;
1419 }
1420
Al Viro 631e8a12005-05-16 01:59:55 +01001421 if ((buffer[offset] & 0x3f) != modepage) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001422 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
Al Viro 631e8a12005-05-16 01:59:55 +01001423 goto defaults;
1424 }
1425
1426 if (modepage == 8) {
1427 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1428 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1429 } else {
1430 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1431 sdkp->RCD = 0;
1432 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433
Tejun Heo007365a2006-01-06 09:53:52 +01001434 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1435 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001436 sd_printk(KERN_NOTICE, sdkp,
1437 "Uses READ/WRITE(6), disabling FUA\n");
Tejun Heo007365a2006-01-06 09:53:52 +01001438 sdkp->DPOFUA = 0;
1439 }
1440
Martin K. Petersene73aec82007-02-27 22:40:55 -05001441 sd_printk(KERN_NOTICE, sdkp,
1442 "Write cache: %s, read cache: %s, %s\n",
Luben Tuikovfd44bab2006-11-15 12:47:08 -08001443 sdkp->WCE ? "enabled" : "disabled",
1444 sdkp->RCD ? "disabled" : "enabled",
1445 sdkp->DPOFUA ? "supports DPO and FUA"
1446 : "doesn't support DPO or FUA");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
1448 return;
1449 }
1450
1451bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05001452 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 sshdr.sense_key == ILLEGAL_REQUEST &&
1454 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
Martin K. Petersene73aec82007-02-27 22:40:55 -05001455 /* Invalid field in CDB */
1456 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05001458 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
1460defaults:
Martin K. Petersene73aec82007-02-27 22:40:55 -05001461 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 sdkp->WCE = 0;
1463 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06001464 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465}
1466
1467/**
1468 * sd_revalidate_disk - called the first time a new disk is seen,
1469 * performs disk spin up, read_capacity, etc.
1470 * @disk: struct gendisk we care about
1471 **/
1472static int sd_revalidate_disk(struct gendisk *disk)
1473{
1474 struct scsi_disk *sdkp = scsi_disk(disk);
1475 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 unsigned char *buffer;
Tejun Heo461d4e92006-01-06 09:52:55 +01001477 unsigned ordered;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001479 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1480 "sd_revalidate_disk\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481
1482 /*
1483 * If the device is offline, don't try and read capacity or any
1484 * of the other niceties.
1485 */
1486 if (!scsi_device_online(sdp))
1487 goto out;
1488
Al Viro48970802006-02-26 08:34:10 -06001489 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 if (!buffer) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001491 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1492 "allocation failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05001493 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 }
1495
1496 /* defaults, until the device tells us otherwise */
1497 sdp->sector_size = 512;
1498 sdkp->capacity = 0;
1499 sdkp->media_present = 1;
1500 sdkp->write_prot = 0;
1501 sdkp->WCE = 0;
1502 sdkp->RCD = 0;
1503
Martin K. Petersene73aec82007-02-27 22:40:55 -05001504 sd_spinup_disk(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505
1506 /*
1507 * Without media there is no reason to ask; moreover, some devices
1508 * react badly if we do.
1509 */
1510 if (sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001511 sd_read_capacity(sdkp, buffer);
1512 sd_read_write_protect_flag(sdkp, buffer);
1513 sd_read_cache_type(sdkp, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 }
Tejun Heo461d4e92006-01-06 09:52:55 +01001515
1516 /*
1517 * We now have all cache related info, determine how we deal
1518 * with ordered requests. Note that as the current SCSI
1519 * dispatch function can alter request order, we cannot use
1520 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1521 */
1522 if (sdkp->WCE)
Tejun Heo007365a2006-01-06 09:53:52 +01001523 ordered = sdkp->DPOFUA
1524 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
Tejun Heo461d4e92006-01-06 09:52:55 +01001525 else
1526 ordered = QUEUE_ORDERED_DRAIN;
1527
1528 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1529
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 set_capacity(disk, sdkp->capacity);
1531 kfree(buffer);
1532
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533 out:
1534 return 0;
1535}
1536
1537/**
1538 * sd_probe - called during driver initialization and whenever a
1539 * new scsi device is attached to the system. It is called once
1540 * for each scsi device (not just disks) present.
1541 * @dev: pointer to device object
1542 *
1543 * Returns 0 if successful (or not interested in this scsi device
1544 * (e.g. scanner)); 1 when there is an error.
1545 *
1546 * Note: this function is invoked from the scsi mid-level.
1547 * This function sets up the mapping between a given
1548 * <host,channel,id,lun> (found in sdp) and new device name
1549 * (e.g. /dev/sda). More precisely it is the block device major
1550 * and minor number that is chosen here.
1551 *
1552 * Assume sd_attach is not re-entrant (for time being)
1553 * Also think about sd_attach() and sd_remove() running coincidentally.
1554 **/
1555static int sd_probe(struct device *dev)
1556{
1557 struct scsi_device *sdp = to_scsi_device(dev);
1558 struct scsi_disk *sdkp;
1559 struct gendisk *gd;
1560 u32 index;
1561 int error;
1562
1563 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01001564 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 goto out;
1566
James Bottomley9ccfc752005-10-02 11:45:08 -05001567 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1568 "sd_attach\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569
1570 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05001571 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 if (!sdkp)
1573 goto out;
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 gd = alloc_disk(16);
1576 if (!gd)
1577 goto out_free;
1578
1579 if (!idr_pre_get(&sd_index_idr, GFP_KERNEL))
1580 goto out_put;
1581
1582 spin_lock(&sd_index_lock);
1583 error = idr_get_new(&sd_index_idr, NULL, &index);
1584 spin_unlock(&sd_index_lock);
1585
1586 if (index >= SD_MAX_DISKS)
1587 error = -EBUSY;
1588 if (error)
1589 goto out_put;
1590
1591 sdkp->device = sdp;
1592 sdkp->driver = &sd_template;
1593 sdkp->disk = gd;
1594 sdkp->index = index;
1595 sdkp->openers = 0;
1596
1597 if (!sdp->timeout) {
Al Viro 631e8a12005-05-16 01:59:55 +01001598 if (sdp->type != TYPE_MOD)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 sdp->timeout = SD_TIMEOUT;
1600 else
1601 sdp->timeout = SD_MOD_TIMEOUT;
1602 }
1603
Nagendra Singh Tomar017f2e32007-02-02 17:34:56 +05301604 class_device_initialize(&sdkp->cdev);
1605 sdkp->cdev.dev = &sdp->sdev_gendev;
1606 sdkp->cdev.class = &sd_disk_class;
1607 strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1608
1609 if (class_device_add(&sdkp->cdev))
1610 goto out_put;
1611
1612 get_device(&sdp->sdev_gendev);
1613
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 gd->major = sd_major((index & 0xf0) >> 4);
1615 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1616 gd->minors = 16;
1617 gd->fops = &sd_fops;
1618
1619 if (index < 26) {
1620 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1621 } else if (index < (26 + 1) * 26) {
1622 sprintf(gd->disk_name, "sd%c%c",
1623 'a' + index / 26 - 1,'a' + index % 26);
1624 } else {
1625 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1626 const unsigned int m2 = (index / 26 - 1) % 26;
1627 const unsigned int m3 = index % 26;
1628 sprintf(gd->disk_name, "sd%c%c%c",
1629 'a' + m1, 'a' + m2, 'a' + m3);
1630 }
1631
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 gd->private_data = &sdkp->driver;
Tejun Heo461d4e92006-01-06 09:52:55 +01001633 gd->queue = sdkp->device->request_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634
1635 sd_revalidate_disk(gd);
1636
1637 gd->driverfs_dev = &sdp->sdev_gendev;
1638 gd->flags = GENHD_FL_DRIVERFS;
1639 if (sdp->removable)
1640 gd->flags |= GENHD_FL_REMOVABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641
1642 dev_set_drvdata(dev, sdkp);
1643 add_disk(gd);
1644
Martin K. Petersene73aec82007-02-27 22:40:55 -05001645 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1646 sdp->removable ? "removable " : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647
1648 return 0;
1649
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001650 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001652 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001654 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 return error;
1656}
1657
1658/**
1659 * sd_remove - called whenever a scsi disk (previously recognized by
1660 * sd_probe) is detached from the system. It is called (potentially
1661 * multiple times) during sd module unload.
1662 * @sdp: pointer to mid level scsi device object
1663 *
1664 * Note: this function is invoked from the scsi mid-level.
1665 * This function potentially frees up a device name (e.g. /dev/sdc)
1666 * that could be re-used by a subsequent sd_probe().
1667 * This function is not called when the built-in sd driver is "exit-ed".
1668 **/
1669static int sd_remove(struct device *dev)
1670{
1671 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1672
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001673 class_device_del(&sdkp->cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 del_gendisk(sdkp->disk);
1675 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001676
Arjan van de Ven0b950672006-01-11 13:16:10 +01001677 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001678 dev_set_drvdata(dev, NULL);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001679 class_device_put(&sdkp->cdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001680 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681
1682 return 0;
1683}
1684
1685/**
1686 * scsi_disk_release - Called to free the scsi_disk structure
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001687 * @cdev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01001689 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 * called on last put, you should always use the scsi_disk_get()
1691 * scsi_disk_put() helpers which manipulate the semaphore directly
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001692 * and never do a direct class_device_put().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 **/
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001694static void scsi_disk_release(struct class_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695{
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001696 struct scsi_disk *sdkp = to_scsi_disk(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 struct gendisk *disk = sdkp->disk;
1698
1699 spin_lock(&sd_index_lock);
1700 idr_remove(&sd_index_idr, sdkp->index);
1701 spin_unlock(&sd_index_lock);
1702
1703 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001705 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
1707 kfree(sdkp);
1708}
1709
1710/*
1711 * Send a SYNCHRONIZE CACHE instruction down to the device through
1712 * the normal SCSI command structure. Wait for the command to
1713 * complete.
1714 */
1715static void sd_shutdown(struct device *dev)
1716{
Alan Stern39b7f1e2005-11-04 14:44:41 -05001717 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718
1719 if (!sdkp)
1720 return; /* this can happen */
1721
Alan Stern39b7f1e2005-11-04 14:44:41 -05001722 if (sdkp->WCE) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001723 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1724 sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001725 }
1726 scsi_disk_put(sdkp);
1727}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728
1729/**
1730 * init_sd - entry point for this driver (both when built in or when
1731 * a module).
1732 *
1733 * Note: this function registers this driver with the scsi mid-level.
1734 **/
1735static int __init init_sd(void)
1736{
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001737 int majors = 0, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738
1739 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
1740
1741 for (i = 0; i < SD_MAJORS; i++)
1742 if (register_blkdev(sd_major(i), "sd") == 0)
1743 majors++;
1744
1745 if (!majors)
1746 return -ENODEV;
1747
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001748 err = class_register(&sd_disk_class);
1749 if (err)
1750 goto err_out;
James Bottomley6bdaa1f2006-03-18 14:14:21 -06001751
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001752 err = scsi_register_driver(&sd_template.gendrv);
1753 if (err)
1754 goto err_out_class;
1755
1756 return 0;
1757
1758err_out_class:
1759 class_unregister(&sd_disk_class);
1760err_out:
1761 for (i = 0; i < SD_MAJORS; i++)
1762 unregister_blkdev(sd_major(i), "sd");
1763 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764}
1765
1766/**
1767 * exit_sd - exit point for this driver (when it is a module).
1768 *
1769 * Note: this function unregisters this driver from the scsi mid-level.
1770 **/
1771static void __exit exit_sd(void)
1772{
1773 int i;
1774
1775 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
1776
1777 scsi_unregister_driver(&sd_template.gendrv);
Jeff Garzik5e4009b2006-10-04 05:32:54 -04001778 class_unregister(&sd_disk_class);
1779
Linus Torvalds1da177e2005-04-16 15:20:36 -07001780 for (i = 0; i < SD_MAJORS; i++)
1781 unregister_blkdev(sd_major(i), "sd");
1782}
1783
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784module_init(init_sd);
1785module_exit(exit_sd);
Martin K. Petersene73aec82007-02-27 22:40:55 -05001786
1787static void sd_print_sense_hdr(struct scsi_disk *sdkp,
1788 struct scsi_sense_hdr *sshdr)
1789{
1790 sd_printk(KERN_INFO, sdkp, "");
1791 scsi_show_sense_hdr(sshdr);
1792 sd_printk(KERN_INFO, sdkp, "");
1793 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
1794}
1795
1796static void sd_print_result(struct scsi_disk *sdkp, int result)
1797{
1798 sd_printk(KERN_INFO, sdkp, "");
1799 scsi_show_result(result);
1800}
1801