blob: 9093c7261f330085bf4ba843b18b8e53ad4270cd [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>
James Bottomley7404ad32008-08-31 10:41:52 -050050#include <linux/string_helpers.h>
Arjan van de Ven4ace92f2009-01-04 05:32:28 -080051#include <linux/async.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <asm/uaccess.h>
Dave Hansen8f76d152009-04-21 16:43:27 -070053#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55#include <scsi/scsi.h>
56#include <scsi/scsi_cmnd.h>
57#include <scsi/scsi_dbg.h>
58#include <scsi/scsi_device.h>
59#include <scsi/scsi_driver.h>
60#include <scsi/scsi_eh.h>
61#include <scsi/scsi_host.h>
62#include <scsi/scsi_ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#include <scsi/scsicam.h>
64
Martin K. Petersenaa916962008-06-17 12:47:32 -040065#include "sd.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include "scsi_logging.h"
67
Rene Hermanf018fa52006-03-08 00:14:20 -080068MODULE_AUTHOR("Eric Youngdale");
69MODULE_DESCRIPTION("SCSI disk (sd) driver");
70MODULE_LICENSE("GPL");
71
72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
73MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040088MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
89MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
90MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
Rene Hermanf018fa52006-03-08 00:14:20 -080091
Tejun Heo870d6652008-08-25 19:47:25 +090092#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
Tejun Heof615b482008-08-25 19:47:24 +090093#define SD_MINORS 16
Tejun Heo870d6652008-08-25 19:47:25 +090094#else
Tejun Heo3e1a7ff2008-08-25 19:56:17 +090095#define SD_MINORS 0
Tejun Heo870d6652008-08-25 19:47:25 +090096#endif
97
Linus Torvalds7b3d9542008-01-06 10:17:12 -080098static int sd_revalidate_disk(struct gendisk *);
99static int sd_probe(struct device *);
100static int sd_remove(struct device *);
101static void sd_shutdown(struct device *);
102static int sd_suspend(struct device *, pm_message_t state);
103static int sd_resume(struct device *);
104static void sd_rescan(struct device *);
105static int sd_done(struct scsi_cmnd *);
106static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
Tony Jonesee959b02008-02-22 00:13:36 +0100107static void scsi_disk_release(struct device *cdev);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800108static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
109static void sd_print_result(struct scsi_disk *, int);
110
Tejun Heo4034cc62009-02-21 11:04:45 +0900111static DEFINE_SPINLOCK(sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +0900112static DEFINE_IDA(sd_index_ida);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114/* This semaphore is used to mediate the 0->1 reference get in the
115 * face of object destruction (i.e. we can't allow a get on an
116 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100117static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400119struct kmem_cache *sd_cdb_cache;
120mempool_t *sd_cdb_pool;
121
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600122static const char *sd_cache_types[] = {
123 "write through", "none", "write back",
124 "write back, no read (daft)"
125};
126
Tony Jonesee959b02008-02-22 00:13:36 +0100127static ssize_t
128sd_store_cache_type(struct device *dev, struct device_attribute *attr,
129 const char *buf, size_t count)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600130{
131 int i, ct = -1, rcd, wce, sp;
Tony Jonesee959b02008-02-22 00:13:36 +0100132 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600133 struct scsi_device *sdp = sdkp->device;
134 char buffer[64];
135 char *buffer_data;
136 struct scsi_mode_data data;
137 struct scsi_sense_hdr sshdr;
138 int len;
139
140 if (sdp->type != TYPE_DISK)
141 /* no cache control on RBC devices; theoretically they
142 * can do it, but there's probably so many exceptions
143 * it's not worth the risk */
144 return -EINVAL;
145
Tobias Klauser6391a112006-06-08 22:23:48 -0700146 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600147 const int len = strlen(sd_cache_types[i]);
148 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
149 buf[len] == '\n') {
150 ct = i;
151 break;
152 }
153 }
154 if (ct < 0)
155 return -EINVAL;
156 rcd = ct & 0x01 ? 1 : 0;
157 wce = ct & 0x02 ? 1 : 0;
158 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
159 SD_MAX_RETRIES, &data, NULL))
160 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800161 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600162 data.block_descriptor_length);
163 buffer_data = buffer + data.header_length +
164 data.block_descriptor_length;
165 buffer_data[2] &= ~0x05;
166 buffer_data[2] |= wce << 2 | rcd;
167 sp = buffer_data[0] & 0x80 ? 1 : 0;
168
169 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
170 SD_MAX_RETRIES, &data, &sshdr)) {
171 if (scsi_sense_valid(&sshdr))
Martin K. Petersene73aec82007-02-27 22:40:55 -0500172 sd_print_sense_hdr(sdkp, &sshdr);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600173 return -EINVAL;
174 }
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -0600175 revalidate_disk(sdkp->disk);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600176 return count;
177}
178
Tony Jonesee959b02008-02-22 00:13:36 +0100179static ssize_t
180sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
181 const char *buf, size_t count)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900182{
Tony Jonesee959b02008-02-22 00:13:36 +0100183 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900184 struct scsi_device *sdp = sdkp->device;
185
186 if (!capable(CAP_SYS_ADMIN))
187 return -EACCES;
188
189 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
190
191 return count;
192}
193
Tony Jonesee959b02008-02-22 00:13:36 +0100194static ssize_t
195sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
196 const char *buf, size_t count)
Brian Kinga144c5a2006-06-27 11:10:31 -0500197{
Tony Jonesee959b02008-02-22 00:13:36 +0100198 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500199 struct scsi_device *sdp = sdkp->device;
200
201 if (!capable(CAP_SYS_ADMIN))
202 return -EACCES;
203
204 if (sdp->type != TYPE_DISK)
205 return -EINVAL;
206
207 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
208
209 return count;
210}
211
Tony Jonesee959b02008-02-22 00:13:36 +0100212static ssize_t
213sd_show_cache_type(struct device *dev, struct device_attribute *attr,
214 char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600215{
Tony Jonesee959b02008-02-22 00:13:36 +0100216 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600217 int ct = sdkp->RCD + 2*sdkp->WCE;
218
219 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
220}
221
Tony Jonesee959b02008-02-22 00:13:36 +0100222static ssize_t
223sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600224{
Tony Jonesee959b02008-02-22 00:13:36 +0100225 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600226
227 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
228}
229
Tony Jonesee959b02008-02-22 00:13:36 +0100230static ssize_t
231sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
232 char *buf)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900233{
Tony Jonesee959b02008-02-22 00:13:36 +0100234 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900235 struct scsi_device *sdp = sdkp->device;
236
237 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
238}
239
Tony Jonesee959b02008-02-22 00:13:36 +0100240static ssize_t
241sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
242 char *buf)
Brian Kinga144c5a2006-06-27 11:10:31 -0500243{
Tony Jonesee959b02008-02-22 00:13:36 +0100244 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500245
246 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
247}
248
Martin K. Petersene0597d72008-07-17 04:28:34 -0400249static ssize_t
250sd_show_protection_type(struct device *dev, struct device_attribute *attr,
251 char *buf)
252{
253 struct scsi_disk *sdkp = to_scsi_disk(dev);
254
255 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
256}
257
258static ssize_t
259sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
260 char *buf)
261{
262 struct scsi_disk *sdkp = to_scsi_disk(dev);
263
264 return snprintf(buf, 20, "%u\n", sdkp->ATO);
265}
266
Tony Jonesee959b02008-02-22 00:13:36 +0100267static struct device_attribute sd_disk_attrs[] = {
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600268 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
269 sd_store_cache_type),
270 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
Brian Kinga144c5a2006-06-27 11:10:31 -0500271 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
272 sd_store_allow_restart),
Tejun Heoc3c94c52007-03-21 00:13:59 +0900273 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
274 sd_store_manage_start_stop),
Martin K. Petersene0597d72008-07-17 04:28:34 -0400275 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
276 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600277 __ATTR_NULL,
278};
279
280static struct class sd_disk_class = {
281 .name = "scsi_disk",
282 .owner = THIS_MODULE,
Tony Jonesee959b02008-02-22 00:13:36 +0100283 .dev_release = scsi_disk_release,
284 .dev_attrs = sd_disk_attrs,
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600285};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287static struct scsi_driver sd_template = {
288 .owner = THIS_MODULE,
289 .gendrv = {
290 .name = "sd",
291 .probe = sd_probe,
292 .remove = sd_remove,
Tejun Heoc3c94c52007-03-21 00:13:59 +0900293 .suspend = sd_suspend,
294 .resume = sd_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 .shutdown = sd_shutdown,
296 },
297 .rescan = sd_rescan,
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800298 .done = sd_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
300
301/*
302 * Device no to disk mapping:
303 *
304 * major disc2 disc p1
305 * |............|.............|....|....| <- dev_t
306 * 31 20 19 8 7 4 3 0
307 *
308 * Inside a major, we have 16k disks, however mapped non-
309 * contiguously. The first 16 disks are for major0, the next
310 * ones with major1, ... Disk 256 is for major0 again, disk 272
311 * for major1, ...
312 * As we stay compatible with our numbering scheme, we can reuse
313 * the well-know SCSI majors 8, 65--71, 136--143.
314 */
315static int sd_major(int major_idx)
316{
317 switch (major_idx) {
318 case 0:
319 return SCSI_DISK0_MAJOR;
320 case 1 ... 7:
321 return SCSI_DISK1_MAJOR + major_idx - 1;
322 case 8 ... 15:
323 return SCSI_DISK8_MAJOR + major_idx - 8;
324 default:
325 BUG();
326 return 0; /* shut up gcc */
327 }
328}
329
Alan Stern39b7f1e2005-11-04 14:44:41 -0500330static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
332 struct scsi_disk *sdkp = NULL;
333
Alan Stern39b7f1e2005-11-04 14:44:41 -0500334 if (disk->private_data) {
335 sdkp = scsi_disk(disk);
336 if (scsi_device_get(sdkp->device) == 0)
Tony Jonesee959b02008-02-22 00:13:36 +0100337 get_device(&sdkp->dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500338 else
339 sdkp = NULL;
340 }
341 return sdkp;
342}
343
344static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
345{
346 struct scsi_disk *sdkp;
347
Arjan van de Ven0b950672006-01-11 13:16:10 +0100348 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500349 sdkp = __scsi_disk_get(disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100350 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 return sdkp;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500352}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Alan Stern39b7f1e2005-11-04 14:44:41 -0500354static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
355{
356 struct scsi_disk *sdkp;
357
Arjan van de Ven0b950672006-01-11 13:16:10 +0100358 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500359 sdkp = dev_get_drvdata(dev);
360 if (sdkp)
361 sdkp = __scsi_disk_get(sdkp->disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100362 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 return sdkp;
364}
365
366static void scsi_disk_put(struct scsi_disk *sdkp)
367{
368 struct scsi_device *sdev = sdkp->device;
369
Arjan van de Ven0b950672006-01-11 13:16:10 +0100370 mutex_lock(&sd_ref_mutex);
Tony Jonesee959b02008-02-22 00:13:36 +0100371 put_device(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100373 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
375
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400376static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
377{
378 unsigned int prot_op = SCSI_PROT_NORMAL;
379 unsigned int dix = scsi_prot_sg_count(scmd);
380
381 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
382 if (dif && dix)
383 prot_op = SCSI_PROT_READ_PASS;
384 else if (dif && !dix)
385 prot_op = SCSI_PROT_READ_STRIP;
386 else if (!dif && dix)
387 prot_op = SCSI_PROT_READ_INSERT;
388 } else {
389 if (dif && dix)
390 prot_op = SCSI_PROT_WRITE_PASS;
391 else if (dif && !dix)
392 prot_op = SCSI_PROT_WRITE_INSERT;
393 else if (!dif && dix)
394 prot_op = SCSI_PROT_WRITE_STRIP;
395 }
396
397 scsi_set_prot_op(scmd, prot_op);
398 scsi_set_prot_type(scmd, dif);
399}
400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401/**
402 * sd_init_command - build a scsi (read or write) command from
403 * information in the request structure.
404 * @SCpnt: pointer to mid-level's per scsi command structure that
405 * contains request and into which the scsi command is written
406 *
407 * Returns 1 if successful and 0 if error (or cannot be done now).
408 **/
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500409static int sd_prep_fn(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500411 struct scsi_cmnd *SCpnt;
412 struct scsi_device *sdp = q->queuedata;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100413 struct gendisk *disk = rq->rq_disk;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400414 struct scsi_disk *sdkp;
Tejun Heo83096eb2009-05-07 22:24:39 +0900415 sector_t block = blk_rq_pos(rq);
Linus Torvalds18351072008-08-05 21:42:21 -0700416 sector_t threshold;
Tejun Heo83096eb2009-05-07 22:24:39 +0900417 unsigned int this_count = blk_rq_sectors(rq);
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400418 int ret, host_dif;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400419 unsigned char protect;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500420
421 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
422 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
423 goto out;
424 } else if (rq->cmd_type != REQ_TYPE_FS) {
425 ret = BLKPREP_KILL;
426 goto out;
427 }
428 ret = scsi_setup_fs_cmnd(sdp, rq);
429 if (ret != BLKPREP_OK)
430 goto out;
431 SCpnt = rq->special;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400432 sdkp = scsi_disk(disk);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500433
434 /* from here on until we're complete, any goto out
435 * is used for a killable error condition */
436 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500438 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
439 "sd_init_command: block=%llu, "
440 "count=%d\n",
441 (unsigned long long)block,
442 this_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 if (!sdp || !scsi_device_online(sdp) ||
Tejun Heo83096eb2009-05-07 22:24:39 +0900445 block + blk_rq_sectors(rq) > get_capacity(disk)) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500446 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900447 "Finishing %u sectors\n",
448 blk_rq_sectors(rq)));
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500449 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
450 "Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500451 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 }
453
454 if (sdp->changed) {
455 /*
456 * quietly refuse to do anything to a changed disc until
457 * the changed bit has been reset
458 */
459 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500460 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 }
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500462
Hans de Goedea0899d42008-01-20 11:12:26 +0100463 /*
Linus Torvalds18351072008-08-05 21:42:21 -0700464 * Some SD card readers can't handle multi-sector accesses which touch
465 * the last one or two hardware sectors. Split accesses as needed.
Hans de Goedea0899d42008-01-20 11:12:26 +0100466 */
Linus Torvalds18351072008-08-05 21:42:21 -0700467 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
468 (sdp->sector_size / 512);
469
470 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
471 if (block < threshold) {
472 /* Access up to the threshold but not beyond */
473 this_count = threshold - block;
474 } else {
475 /* Access only a single hardware sector */
476 this_count = sdp->sector_size / 512;
477 }
478 }
Hans de Goedea0899d42008-01-20 11:12:26 +0100479
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500480 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
481 (unsigned long long)block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 /*
484 * If we have a 1K hardware sectorsize, prevent access to single
485 * 512 byte sectors. In theory we could handle this - in fact
486 * the scsi cdrom driver must be able to handle this because
487 * we typically use 1K blocksizes, and cdroms typically have
488 * 2K hardware sectorsizes. Of course, things are simpler
489 * with the cdrom, since it is read-only. For performance
490 * reasons, the filesystems should be able to handle this
491 * and not force the scsi disk driver to use bounce buffers
492 * for this.
493 */
494 if (sdp->sector_size == 1024) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900495 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500496 scmd_printk(KERN_ERR, SCpnt,
497 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500498 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 } else {
500 block = block >> 1;
501 this_count = this_count >> 1;
502 }
503 }
504 if (sdp->sector_size == 2048) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900505 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500506 scmd_printk(KERN_ERR, SCpnt,
507 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500508 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 } else {
510 block = block >> 2;
511 this_count = this_count >> 2;
512 }
513 }
514 if (sdp->sector_size == 4096) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900515 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500516 scmd_printk(KERN_ERR, SCpnt,
517 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500518 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 } else {
520 block = block >> 3;
521 this_count = this_count >> 3;
522 }
523 }
524 if (rq_data_dir(rq) == WRITE) {
525 if (!sdp->writeable) {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500526 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
528 SCpnt->cmnd[0] = WRITE_6;
529 SCpnt->sc_data_direction = DMA_TO_DEVICE;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400530
531 if (blk_integrity_rq(rq) &&
532 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
533 goto out;
534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 } else if (rq_data_dir(rq) == READ) {
536 SCpnt->cmnd[0] = READ_6;
537 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
538 } else {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500539 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500540 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 }
542
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500543 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900544 "%s %d/%u 512 byte blocks.\n",
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500545 (rq_data_dir(rq) == WRITE) ?
546 "writing" : "reading", this_count,
Tejun Heo83096eb2009-05-07 22:24:39 +0900547 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400549 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400550 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
551 if (host_dif)
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400552 protect = 1 << 5;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400553 else
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400554 protect = 0;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400555
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400556 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
557 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
558
559 if (unlikely(SCpnt->cmnd == NULL)) {
560 ret = BLKPREP_DEFER;
561 goto out;
562 }
563
564 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
565 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
566 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
567 SCpnt->cmnd[7] = 0x18;
568 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
569 SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
570
571 /* LBA */
572 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
573 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
574 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
575 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
576 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
577 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
578 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
579 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
580
581 /* Expected Indirect LBA */
582 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
583 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
584 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
585 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
586
587 /* Transfer length */
588 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
589 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
590 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
591 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
592 } else if (block > 0xffffffff) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 SCpnt->cmnd[0] += READ_16 - READ_6;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400594 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
596 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
597 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
598 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
599 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
600 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
601 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
602 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
603 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
604 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
605 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
606 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
607 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
608 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400609 scsi_device_protection(SCpnt->device) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 SCpnt->device->use_10_for_rw) {
611 if (this_count > 0xffff)
612 this_count = 0xffff;
613
614 SCpnt->cmnd[0] += READ_10 - READ_6;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400615 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
617 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
618 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
619 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
620 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
621 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
622 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
623 } else {
Tejun Heo007365a2006-01-06 09:53:52 +0100624 if (unlikely(blk_fua_rq(rq))) {
625 /*
626 * This happens only if this drive failed
627 * 10byte rw command with ILLEGAL_REQUEST
628 * during operation and thus turned off
629 * use_10_for_rw.
630 */
Martin K. Petersene73aec82007-02-27 22:40:55 -0500631 scmd_printk(KERN_ERR, SCpnt,
632 "FUA write on READ/WRITE(6) drive\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500633 goto out;
Tejun Heo007365a2006-01-06 09:53:52 +0100634 }
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
637 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
638 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
639 SCpnt->cmnd[4] = (unsigned char) this_count;
640 SCpnt->cmnd[5] = 0;
641 }
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200642 SCpnt->sdb.length = this_count * sdp->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400644 /* If DIF or DIX is enabled, tell HBA how to handle request */
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400645 if (host_dif || scsi_prot_sg_count(SCpnt))
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400646 sd_prot_op(SCpnt, host_dif);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 /*
649 * We shouldn't disconnect in the middle of a sector, so with a dumb
650 * host adapter, it's safe to assume that we can at least transfer
651 * this many bytes between each connect / disconnect.
652 */
653 SCpnt->transfersize = sdp->sector_size;
654 SCpnt->underflow = this_count << 9;
655 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
657 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 * This indicates that the command is ready from our end to be
659 * queued.
660 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500661 ret = BLKPREP_OK;
662 out:
663 return scsi_prep_return(q, rq, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664}
665
666/**
667 * sd_open - open a scsi disk device
668 * @inode: only i_rdev member may be used
669 * @filp: only f_mode and f_flags may be used
670 *
671 * Returns 0 if successful. Returns a negated errno value in case
672 * of error.
673 *
674 * Note: This can be called from a user context (e.g. fsck(1) )
675 * or from within the kernel (e.g. as a result of a mount(1) ).
676 * In the latter case @inode and @filp carry an abridged amount
677 * of information as noted above.
678 **/
Al Viro0338e292008-03-02 10:41:04 -0500679static int sd_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680{
Al Viro0338e292008-03-02 10:41:04 -0500681 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 struct scsi_device *sdev;
683 int retval;
684
Al Viro0338e292008-03-02 10:41:04 -0500685 if (!sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 return -ENXIO;
687
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500688 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
690 sdev = sdkp->device;
691
692 /*
693 * If the device is in error recovery, wait until it is done.
694 * If the device is offline, then disallow any access to it.
695 */
696 retval = -ENXIO;
697 if (!scsi_block_when_processing_errors(sdev))
698 goto error_out;
699
700 if (sdev->removable || sdkp->write_prot)
Al Viro0338e292008-03-02 10:41:04 -0500701 check_disk_change(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 /*
704 * If the drive is empty, just let the open fail.
705 */
706 retval = -ENOMEDIUM;
Al Viro0338e292008-03-02 10:41:04 -0500707 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 goto error_out;
709
710 /*
711 * If the device has the write protect tab set, have the open fail
712 * if the user expects to be able to write to the thing.
713 */
714 retval = -EROFS;
Al Viro0338e292008-03-02 10:41:04 -0500715 if (sdkp->write_prot && (mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 goto error_out;
717
718 /*
719 * It is possible that the disk changing stuff resulted in
720 * the device being taken offline. If this is the case,
721 * report this to the user, and don't pretend that the
722 * open actually succeeded.
723 */
724 retval = -ENXIO;
725 if (!scsi_device_online(sdev))
726 goto error_out;
727
728 if (!sdkp->openers++ && sdev->removable) {
729 if (scsi_block_when_processing_errors(sdev))
730 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
731 }
732
733 return 0;
734
735error_out:
736 scsi_disk_put(sdkp);
737 return retval;
738}
739
740/**
741 * sd_release - invoked when the (last) close(2) is called on this
742 * scsi disk.
743 * @inode: only i_rdev member may be used
744 * @filp: only f_mode and f_flags may be used
745 *
746 * Returns 0.
747 *
748 * Note: may block (uninterruptible) if error recovery is underway
749 * on this disk.
750 **/
Al Viro0338e292008-03-02 10:41:04 -0500751static int sd_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 struct scsi_disk *sdkp = scsi_disk(disk);
754 struct scsi_device *sdev = sdkp->device;
755
James Bottomley56937f72007-03-11 12:25:33 -0500756 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758 if (!--sdkp->openers && sdev->removable) {
759 if (scsi_block_when_processing_errors(sdev))
760 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
761 }
762
763 /*
764 * XXX and what if there are packets in flight and this close()
765 * XXX is followed by a "rmmod sd_mod"?
766 */
767 scsi_disk_put(sdkp);
768 return 0;
769}
770
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800771static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772{
773 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
774 struct scsi_device *sdp = sdkp->device;
775 struct Scsi_Host *host = sdp->host;
776 int diskinfo[4];
777
778 /* default to most commonly used values */
779 diskinfo[0] = 0x40; /* 1 << 6 */
780 diskinfo[1] = 0x20; /* 1 << 5 */
781 diskinfo[2] = sdkp->capacity >> 11;
782
783 /* override with calculated, extended default, or driver values */
784 if (host->hostt->bios_param)
785 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
786 else
787 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
788
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800789 geo->heads = diskinfo[0];
790 geo->sectors = diskinfo[1];
791 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 return 0;
793}
794
795/**
796 * sd_ioctl - process an ioctl
797 * @inode: only i_rdev/i_bdev members may be used
798 * @filp: only f_mode and f_flags may be used
799 * @cmd: ioctl command number
800 * @arg: this is third argument given to ioctl(2) system call.
801 * Often contains a pointer.
802 *
803 * Returns 0 if successful (some ioctls return postive numbers on
804 * success as well). Returns a negated errno value in case of error.
805 *
806 * Note: most ioctls are forward onto the block subsystem or further
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200807 * down in the scsi subsystem.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 **/
Al Viro0338e292008-03-02 10:41:04 -0500809static int sd_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 unsigned int cmd, unsigned long arg)
811{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 struct gendisk *disk = bdev->bd_disk;
813 struct scsi_device *sdp = scsi_disk(disk)->device;
814 void __user *p = (void __user *)arg;
815 int error;
816
817 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
818 disk->disk_name, cmd));
819
820 /*
821 * If we are in the middle of error recovery, don't let anyone
822 * else try and use this device. Also, if error recovery fails, it
823 * may try and take the device offline, in which case all further
824 * access to the device is prohibited.
825 */
Al Viro83ff6fe2008-03-02 08:15:49 -0500826 error = scsi_nonblockable_ioctl(sdp, cmd, p,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +0100827 (mode & FMODE_NDELAY) != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 if (!scsi_block_when_processing_errors(sdp) || !error)
829 return error;
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 /*
832 * Send SCSI addressing ioctls directly to mid level, send other
833 * ioctls to block level and then onto mid level if they can't be
834 * resolved.
835 */
836 switch (cmd) {
837 case SCSI_IOCTL_GET_IDLUN:
838 case SCSI_IOCTL_GET_BUS_NUMBER:
839 return scsi_ioctl(sdp, cmd, p);
840 default:
Al Viro0338e292008-03-02 10:41:04 -0500841 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 if (error != -ENOTTY)
843 return error;
844 }
845 return scsi_ioctl(sdp, cmd, p);
846}
847
848static void set_media_not_present(struct scsi_disk *sdkp)
849{
850 sdkp->media_present = 0;
851 sdkp->capacity = 0;
852 sdkp->device->changed = 1;
853}
854
855/**
856 * sd_media_changed - check if our medium changed
857 * @disk: kernel device descriptor
858 *
859 * Returns 0 if not applicable or no change; 1 if change
860 *
861 * Note: this function is invoked from the block subsystem.
862 **/
863static int sd_media_changed(struct gendisk *disk)
864{
865 struct scsi_disk *sdkp = scsi_disk(disk);
866 struct scsi_device *sdp = sdkp->device;
James Bottomley001aac22007-12-02 19:10:40 +0200867 struct scsi_sense_hdr *sshdr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 int retval;
869
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500870 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872 if (!sdp->removable)
873 return 0;
874
875 /*
876 * If the device is offline, don't send any commands - just pretend as
877 * if the command failed. If the device ever comes back online, we
878 * can deal with it then. It is only because of unrecoverable errors
879 * that we would ever take a device offline in the first place.
880 */
Kay Sievers285e9672007-08-14 14:10:39 +0200881 if (!scsi_device_online(sdp)) {
882 set_media_not_present(sdkp);
883 retval = 1;
884 goto out;
885 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887 /*
888 * Using TEST_UNIT_READY enables differentiation between drive with
889 * no cartridge loaded - NOT READY, drive with changed cartridge -
890 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
891 *
892 * Drives that auto spin down. eg iomega jaz 1G, will be started
893 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
894 * sd_revalidate() is called.
895 */
896 retval = -ENODEV;
Kay Sievers285e9672007-08-14 14:10:39 +0200897
James Bottomley001aac22007-12-02 19:10:40 +0200898 if (scsi_block_when_processing_errors(sdp)) {
899 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
900 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
901 sshdr);
902 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
904 /*
905 * Unable to test, unit probably not ready. This usually
906 * means there is no disc in the drive. Mark as changed,
907 * and we will figure it out later once the drive is
908 * available again.
909 */
James Bottomley001aac22007-12-02 19:10:40 +0200910 if (retval || (scsi_sense_valid(sshdr) &&
911 /* 0x3a is medium not present */
912 sshdr->asc == 0x3a)) {
Kay Sievers285e9672007-08-14 14:10:39 +0200913 set_media_not_present(sdkp);
914 retval = 1;
915 goto out;
916 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
918 /*
919 * For removable scsi disk we have to recognise the presence
920 * of a disk in the drive. This is kept in the struct scsi_disk
921 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
922 */
923 sdkp->media_present = 1;
924
925 retval = sdp->changed;
926 sdp->changed = 0;
Kay Sievers285e9672007-08-14 14:10:39 +0200927out:
928 if (retval != sdkp->previous_state)
929 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
930 sdkp->previous_state = retval;
James Bottomley001aac22007-12-02 19:10:40 +0200931 kfree(sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933}
934
Martin K. Petersene73aec82007-02-27 22:40:55 -0500935static int sd_sync_cache(struct scsi_disk *sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 int retries, res;
Martin K. Petersene73aec82007-02-27 22:40:55 -0500938 struct scsi_device *sdp = sdkp->device;
James Bottomleyea73a9f2005-08-28 11:33:52 -0500939 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941 if (!scsi_device_online(sdp))
942 return -ENODEV;
943
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 for (retries = 3; retries > 0; --retries) {
946 unsigned char cmd[10] = { 0 };
947
948 cmd[0] = SYNCHRONIZE_CACHE;
949 /*
950 * Leave the rest of the command zero to indicate
951 * flush everything.
952 */
James Bottomleyea73a9f2005-08-28 11:33:52 -0500953 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900954 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
James Bottomleyea73a9f2005-08-28 11:33:52 -0500955 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 break;
957 }
958
Martin K. Petersene73aec82007-02-27 22:40:55 -0500959 if (res) {
960 sd_print_result(sdkp, res);
961 if (driver_byte(res) & DRIVER_SENSE)
962 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 }
964
Tejun Heo37210502007-03-21 00:07:18 +0900965 if (res)
966 return -EIO;
967 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968}
969
Jens Axboe165125e2007-07-24 09:28:11 +0200970static void sd_prepare_flush(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971{
Jens Axboe4aff5e22006-08-10 08:44:47 +0200972 rq->cmd_type = REQ_TYPE_BLOCK_PC;
James Bottomleyc0ed79a2005-11-08 09:21:07 -0500973 rq->timeout = SD_TIMEOUT;
974 rq->cmd[0] = SYNCHRONIZE_CACHE;
Tejun Heo461d4e92006-01-06 09:52:55 +0100975 rq->cmd_len = 10;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
978static void sd_rescan(struct device *dev)
979{
Alan Stern39b7f1e2005-11-04 14:44:41 -0500980 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
981
982 if (sdkp) {
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -0600983 revalidate_disk(sdkp->disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500984 scsi_disk_put(sdkp);
985 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986}
987
988
989#ifdef CONFIG_COMPAT
990/*
991 * This gets directly called from VFS. When the ioctl
992 * is not recognized we go back to the other translation paths.
993 */
Al Viro0338e292008-03-02 10:41:04 -0500994static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
995 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996{
Al Viro0338e292008-03-02 10:41:04 -0500997 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
999 /*
1000 * If we are in the middle of error recovery, don't let anyone
1001 * else try and use this device. Also, if error recovery fails, it
1002 * may try and take the device offline, in which case all further
1003 * access to the device is prohibited.
1004 */
1005 if (!scsi_block_when_processing_errors(sdev))
1006 return -ENODEV;
1007
1008 if (sdev->host->hostt->compat_ioctl) {
1009 int ret;
1010
1011 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1012
1013 return ret;
1014 }
1015
1016 /*
1017 * Let the static ioctl translation table take care of it.
1018 */
1019 return -ENOIOCTLCMD;
1020}
1021#endif
1022
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07001023static const struct block_device_operations sd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 .owner = THIS_MODULE,
Al Viro0338e292008-03-02 10:41:04 -05001025 .open = sd_open,
1026 .release = sd_release,
1027 .locked_ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001028 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029#ifdef CONFIG_COMPAT
Al Viro0338e292008-03-02 10:41:04 -05001030 .compat_ioctl = sd_compat_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031#endif
1032 .media_changed = sd_media_changed,
1033 .revalidate_disk = sd_revalidate_disk,
1034};
1035
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001036static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1037{
Tejun Heo83096eb2009-05-07 22:24:39 +09001038 u64 start_lba = blk_rq_pos(scmd->request);
1039 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001040 u64 bad_lba;
1041 int info_valid;
1042
1043 if (!blk_fs_request(scmd->request))
1044 return 0;
1045
1046 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1047 SCSI_SENSE_BUFFERSIZE,
1048 &bad_lba);
1049 if (!info_valid)
1050 return 0;
1051
1052 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1053 return 0;
1054
1055 if (scmd->device->sector_size < 512) {
1056 /* only legitimate sector_size here is 256 */
1057 start_lba <<= 1;
1058 end_lba <<= 1;
1059 } else {
1060 /* be careful ... don't want any overflows */
1061 u64 factor = scmd->device->sector_size / 512;
1062 do_div(start_lba, factor);
1063 do_div(end_lba, factor);
1064 }
1065
1066 /* The bad lba was reported incorrectly, we have no idea where
1067 * the error is.
1068 */
1069 if (bad_lba < start_lba || bad_lba >= end_lba)
1070 return 0;
1071
1072 /* This computation should always be done in terms of
1073 * the resolution of the device's medium.
1074 */
1075 return (bad_lba - start_lba) * scmd->device->sector_size;
1076}
1077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078/**
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001079 * sd_done - bottom half handler: called when the lower level
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 * driver has completed (successfully or otherwise) a scsi command.
1081 * @SCpnt: mid-level's per command structure.
1082 *
1083 * Note: potentially run from within an ISR. Must not block.
1084 **/
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001085static int sd_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
1087 int result = SCpnt->result;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001088 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 struct scsi_sense_hdr sshdr;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001090 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 int sense_valid = 0;
1092 int sense_deferred = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094 if (result) {
1095 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1096 if (sense_valid)
1097 sense_deferred = scsi_sense_is_deferred(&sshdr);
1098 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099#ifdef CONFIG_SCSI_LOGGING
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001100 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 if (sense_valid) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001102 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001103 "sd_done: sb[respc,sk,asc,"
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001104 "ascq]=%x,%x,%x,%x\n",
1105 sshdr.response_code,
1106 sshdr.sense_key, sshdr.asc,
1107 sshdr.ascq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 }
1109#endif
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001110 if (driver_byte(result) != DRIVER_SENSE &&
1111 (!sense_valid || sense_deferred))
1112 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001114 switch (sshdr.sense_key) {
1115 case HARDWARE_ERROR:
1116 case MEDIUM_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001117 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001118 break;
1119 case RECOVERED_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001120 good_bytes = scsi_bufflen(SCpnt);
1121 break;
Jamie Wellnitz10dab222008-09-11 21:39:36 -04001122 case NO_SENSE:
1123 /* This indicates a false check condition, so ignore it. An
1124 * unknown amount of data was transferred so treat it as an
1125 * error.
1126 */
1127 scsi_print_sense("sd", SCpnt);
1128 SCpnt->result = 0;
1129 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1130 break;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001131 case ABORTED_COMMAND:
1132 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
1133 scsi_print_result(SCpnt);
1134 scsi_print_sense("sd", SCpnt);
1135 good_bytes = sd_completed_bytes(SCpnt);
1136 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001137 break;
1138 case ILLEGAL_REQUEST:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001139 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
1140 scsi_print_result(SCpnt);
1141 scsi_print_sense("sd", SCpnt);
1142 good_bytes = sd_completed_bytes(SCpnt);
1143 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001144 break;
1145 default:
1146 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001148 out:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001149 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1150 sd_dif_complete(SCpnt, good_bytes);
1151
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001152 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1153 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd)
1154 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1155
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001156 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157}
1158
James Bottomleyea73a9f2005-08-28 11:33:52 -05001159static int media_not_present(struct scsi_disk *sdkp,
1160 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
James Bottomleyea73a9f2005-08-28 11:33:52 -05001163 if (!scsi_sense_valid(sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 return 0;
1165 /* not invoked for commands that could return deferred errors */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001166 if (sshdr->sense_key != NOT_READY &&
1167 sshdr->sense_key != UNIT_ATTENTION)
1168 return 0;
1169 if (sshdr->asc != 0x3A) /* medium not present */
1170 return 0;
1171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 set_media_not_present(sdkp);
1173 return 1;
1174}
1175
1176/*
1177 * spinup disk - called only in sd_revalidate_disk()
1178 */
1179static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001180sd_spinup_disk(struct scsi_disk *sdkp)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001181{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -04001183 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 int retries, spintime;
1185 unsigned int the_result;
1186 struct scsi_sense_hdr sshdr;
1187 int sense_valid = 0;
1188
1189 spintime = 0;
1190
1191 /* Spin up drives, as required. Only do this at boot time */
1192 /* Spinup needs to be done for module loads too. */
1193 do {
1194 retries = 0;
1195
1196 do {
1197 cmd[0] = TEST_UNIT_READY;
1198 memset((void *) &cmd[1], 0, 9);
1199
James Bottomleyea73a9f2005-08-28 11:33:52 -05001200 the_result = scsi_execute_req(sdkp->device, cmd,
1201 DMA_NONE, NULL, 0,
1202 &sshdr, SD_TIMEOUT,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001203 SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204
Alan Sternb4d38e32006-10-11 16:48:28 -04001205 /*
1206 * If the drive has indicated to us that it
1207 * doesn't have any media in it, don't bother
1208 * with any more polling.
1209 */
1210 if (media_not_present(sdkp, &sshdr))
1211 return;
1212
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001214 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 retries++;
1216 } while (retries < 3 &&
1217 (!scsi_status_is_good(the_result) ||
1218 ((driver_byte(the_result) & DRIVER_SENSE) &&
1219 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1220
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1222 /* no sense, TUR either succeeded or failed
1223 * with a status error */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001224 if(!spintime && !scsi_status_is_good(the_result)) {
1225 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1226 sd_print_result(sdkp, the_result);
1227 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 break;
1229 }
1230
1231 /*
1232 * The device does not want the automatic start to be issued.
1233 */
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001234 if (sdkp->device->no_start_on_add)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001237 if (sense_valid && sshdr.sense_key == NOT_READY) {
1238 if (sshdr.asc == 4 && sshdr.ascq == 3)
1239 break; /* manual intervention required */
1240 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1241 break; /* standby */
1242 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1243 break; /* unavailable */
1244 /*
1245 * Issue command to spin up drive when not ready
1246 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 if (!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001248 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 cmd[0] = START_STOP;
1250 cmd[1] = 1; /* Return immediately */
1251 memset((void *) &cmd[2], 0, 8);
1252 cmd[4] = 1; /* Start spin cycle */
Stefan Richterd2886ea2008-05-11 00:34:07 +02001253 if (sdkp->device->start_stop_pwr_cond)
1254 cmd[4] |= 1 << 4;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001255 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1256 NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001257 SD_TIMEOUT, SD_MAX_RETRIES,
1258 NULL);
Alan Stern4451e472005-07-12 10:45:17 -04001259 spintime_expire = jiffies + 100 * HZ;
1260 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 /* Wait 1 second for next try */
1263 msleep(1000);
1264 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001265
1266 /*
1267 * Wait for USB flash devices with slow firmware.
1268 * Yes, this sense key/ASC combination shouldn't
1269 * occur here. It's characteristic of these devices.
1270 */
1271 } else if (sense_valid &&
1272 sshdr.sense_key == UNIT_ATTENTION &&
1273 sshdr.asc == 0x28) {
1274 if (!spintime) {
1275 spintime_expire = jiffies + 5 * HZ;
1276 spintime = 1;
1277 }
1278 /* Wait 1 second for next try */
1279 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 } else {
1281 /* we don't understand the sense code, so it's
1282 * probably pointless to loop */
1283 if(!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001284 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1285 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 }
1287 break;
1288 }
1289
Alan Stern4451e472005-07-12 10:45:17 -04001290 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292 if (spintime) {
1293 if (scsi_status_is_good(the_result))
1294 printk("ready\n");
1295 else
1296 printk("not responding...\n");
1297 }
1298}
1299
Martin K. Petersene0597d72008-07-17 04:28:34 -04001300
1301/*
1302 * Determine whether disk supports Data Integrity Field.
1303 */
1304void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1305{
1306 struct scsi_device *sdp = sdkp->device;
1307 u8 type;
1308
1309 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001310 return;
1311
1312 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1313
1314 if (type == sdkp->protection_type || !sdkp->first_scan)
1315 return;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001316
Martin K. Petersenbe922f42008-09-19 18:47:20 -04001317 sdkp->protection_type = type;
1318
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001319 if (type > SD_DIF_TYPE3_PROTECTION) {
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001320 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1321 "protection type %u. Disabling disk!\n", type);
1322 sdkp->capacity = 0;
1323 return;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001324 }
1325
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001326 if (scsi_host_dif_capable(sdp->host, type))
1327 sd_printk(KERN_NOTICE, sdkp,
1328 "Enabling DIF Type %u protection\n", type);
1329 else
1330 sd_printk(KERN_NOTICE, sdkp,
1331 "Disabling DIF Type %u protection\n", type);
Martin K. Petersene0597d72008-07-17 04:28:34 -04001332}
1333
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001334static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1335 struct scsi_sense_hdr *sshdr, int sense_valid,
1336 int the_result)
1337{
1338 sd_print_result(sdkp, the_result);
1339 if (driver_byte(the_result) & DRIVER_SENSE)
1340 sd_print_sense_hdr(sdkp, sshdr);
1341 else
1342 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1343
1344 /*
1345 * Set dirty bit for removable devices if not ready -
1346 * sometimes drives will not report this properly.
1347 */
1348 if (sdp->removable &&
1349 sense_valid && sshdr->sense_key == NOT_READY)
1350 sdp->changed = 1;
1351
1352 /*
1353 * We used to set media_present to 0 here to indicate no media
1354 * in the drive, but some drives fail read capacity even with
1355 * media present, so we can't do that.
1356 */
1357 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1358}
1359
1360#define RC16_LEN 32
1361#if RC16_LEN > SD_BUF_SIZE
1362#error RC16_LEN must not be more than SD_BUF_SIZE
1363#endif
1364
1365static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1366 unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001367{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 struct scsi_sense_hdr sshdr;
1370 int sense_valid = 0;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001371 int the_result;
1372 int retries = 3;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001373 unsigned int alignment;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001374 unsigned long long lba;
1375 unsigned sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 do {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001378 memset(cmd, 0, 16);
1379 cmd[0] = SERVICE_ACTION_IN;
1380 cmd[1] = SAI_READ_CAPACITY_16;
1381 cmd[13] = RC16_LEN;
1382 memset(buffer, 0, RC16_LEN);
1383
James Bottomleyea73a9f2005-08-28 11:33:52 -05001384 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001385 buffer, RC16_LEN, &sshdr,
1386 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
James Bottomleyea73a9f2005-08-28 11:33:52 -05001388 if (media_not_present(sdkp, &sshdr))
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001389 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
Matthew Wilcox2b301302009-03-12 14:20:30 -04001391 if (the_result) {
James Bottomleyea73a9f2005-08-28 11:33:52 -05001392 sense_valid = scsi_sense_valid(&sshdr);
Matthew Wilcox2b301302009-03-12 14:20:30 -04001393 if (sense_valid &&
1394 sshdr.sense_key == ILLEGAL_REQUEST &&
1395 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1396 sshdr.ascq == 0x00)
1397 /* Invalid Command Operation Code or
1398 * Invalid Field in CDB, just retry
1399 * silently with RC10 */
1400 return -EINVAL;
1401 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 retries--;
1403
1404 } while (the_result && retries);
1405
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001406 if (the_result) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001407 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001408 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1409 return -EINVAL;
1410 }
Martin K. Petersene73aec82007-02-27 22:40:55 -05001411
Dave Hansen8f76d152009-04-21 16:43:27 -07001412 sector_size = get_unaligned_be32(&buffer[8]);
1413 lba = get_unaligned_be64(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001414
1415 sd_read_protection_type(sdkp, buffer);
1416
1417 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1418 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1419 "kernel compiled with support for large block "
1420 "devices.\n");
1421 sdkp->capacity = 0;
1422 return -EOVERFLOW;
1423 }
1424
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001425 /* Logical blocks per physical block exponent */
1426 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1427
1428 /* Lowest aligned logical block */
1429 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1430 blk_queue_alignment_offset(sdp->request_queue, alignment);
1431 if (alignment && sdkp->first_scan)
1432 sd_printk(KERN_NOTICE, sdkp,
1433 "physical block alignment offset: %u\n", alignment);
1434
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001435 sdkp->capacity = lba + 1;
1436 return sector_size;
1437}
1438
1439static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1440 unsigned char *buffer)
1441{
1442 unsigned char cmd[16];
1443 struct scsi_sense_hdr sshdr;
1444 int sense_valid = 0;
1445 int the_result;
1446 int retries = 3;
1447 sector_t lba;
1448 unsigned sector_size;
1449
1450 do {
1451 cmd[0] = READ_CAPACITY;
1452 memset(&cmd[1], 0, 9);
1453 memset(buffer, 0, 8);
1454
1455 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1456 buffer, 8, &sshdr,
1457 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1458
1459 if (media_not_present(sdkp, &sshdr))
1460 return -ENODEV;
1461
1462 if (the_result)
1463 sense_valid = scsi_sense_valid(&sshdr);
1464 retries--;
1465
1466 } while (the_result && retries);
1467
1468 if (the_result) {
1469 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1470 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1471 return -EINVAL;
1472 }
1473
Dave Hansen8f76d152009-04-21 16:43:27 -07001474 sector_size = get_unaligned_be32(&buffer[4]);
1475 lba = get_unaligned_be32(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001476
1477 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1478 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1479 "kernel compiled with support for large block "
1480 "devices.\n");
1481 sdkp->capacity = 0;
1482 return -EOVERFLOW;
1483 }
1484
1485 sdkp->capacity = lba + 1;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001486 sdkp->hw_sector_size = sector_size;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001487 return sector_size;
1488}
1489
Matthew Wilcox2b301302009-03-12 14:20:30 -04001490static int sd_try_rc16_first(struct scsi_device *sdp)
1491{
1492 if (sdp->scsi_level > SCSI_SPC_2)
1493 return 1;
1494 if (scsi_device_protection(sdp))
1495 return 1;
1496 return 0;
1497}
1498
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001499/*
1500 * read disk capacity
1501 */
1502static void
1503sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1504{
1505 int sector_size;
1506 struct scsi_device *sdp = sdkp->device;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001507 sector_t old_capacity = sdkp->capacity;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001508
Matthew Wilcox2b301302009-03-12 14:20:30 -04001509 if (sd_try_rc16_first(sdp)) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001510 sector_size = read_capacity_16(sdkp, sdp, buffer);
1511 if (sector_size == -EOVERFLOW)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 goto got_data;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001513 if (sector_size == -ENODEV)
1514 return;
1515 if (sector_size < 0)
1516 sector_size = read_capacity_10(sdkp, sdp, buffer);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001517 if (sector_size < 0)
1518 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 } else {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001520 sector_size = read_capacity_10(sdkp, sdp, buffer);
1521 if (sector_size == -EOVERFLOW)
1522 goto got_data;
1523 if (sector_size < 0)
1524 return;
1525 if ((sizeof(sdkp->capacity) > 4) &&
1526 (sdkp->capacity > 0xffffffffULL)) {
1527 int old_sector_size = sector_size;
1528 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1529 "Trying to use READ CAPACITY(16).\n");
1530 sector_size = read_capacity_16(sdkp, sdp, buffer);
1531 if (sector_size < 0) {
1532 sd_printk(KERN_NOTICE, sdkp,
1533 "Using 0xffffffff as device size\n");
1534 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1535 sector_size = old_sector_size;
1536 goto got_data;
1537 }
1538 }
1539 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540
Alan Stern5c211ca2009-02-18 10:54:44 -05001541 /* Some devices are known to return the total number of blocks,
1542 * not the highest block number. Some devices have versions
1543 * which do this and others which do not. Some devices we might
1544 * suspect of doing this but we don't know for certain.
1545 *
1546 * If we know the reported capacity is wrong, decrement it. If
1547 * we can only guess, then assume the number of blocks is even
1548 * (usually true but not always) and err on the side of lowering
1549 * the capacity.
1550 */
1551 if (sdp->fix_capacity ||
1552 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1553 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1554 "from its reported value: %llu\n",
1555 (unsigned long long) sdkp->capacity);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 --sdkp->capacity;
Oliver Neukum61bf54b2007-02-08 09:04:48 +01001557 }
1558
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559got_data:
1560 if (sector_size == 0) {
1561 sector_size = 512;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001562 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1563 "assuming 512.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 }
1565
1566 if (sector_size != 512 &&
1567 sector_size != 1024 &&
1568 sector_size != 2048 &&
1569 sector_size != 4096 &&
1570 sector_size != 256) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001571 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1572 sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 /*
1574 * The user might want to re-format the drive with
1575 * a supported sectorsize. Once this happens, it
1576 * would be relatively trivial to set the thing up.
1577 * For this reason, we leave the thing in the table.
1578 */
1579 sdkp->capacity = 0;
1580 /*
1581 * set a bogus sector size so the normal read/write
1582 * logic in the block layer will eventually refuse any
1583 * request on this device without tripping over power
1584 * of two sector size assumptions
1585 */
1586 sector_size = 512;
1587 }
Martin K. Petersene1defc42009-05-22 17:17:49 -04001588 blk_queue_logical_block_size(sdp->request_queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589
James Bottomley7404ad32008-08-31 10:41:52 -05001590 {
1591 char cap_str_2[10], cap_str_10[10];
H. Peter Anvin520a2c22008-10-14 11:34:20 -07001592 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
James Bottomley7404ad32008-08-31 10:41:52 -05001593
1594 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1595 sizeof(cap_str_2));
1596 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1597 sizeof(cap_str_10));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001599 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001600 sd_printk(KERN_NOTICE, sdkp,
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001601 "%llu %d-byte logical blocks: (%s/%s)\n",
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001602 (unsigned long long)sdkp->capacity,
1603 sector_size, cap_str_10, cap_str_2);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001604
1605 if (sdkp->hw_sector_size != sector_size)
1606 sd_printk(KERN_NOTICE, sdkp,
1607 "%u-byte physical blocks\n",
1608 sdkp->hw_sector_size);
1609 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 }
1611
1612 /* Rescale capacity to 512-byte units */
1613 if (sector_size == 4096)
1614 sdkp->capacity <<= 3;
1615 else if (sector_size == 2048)
1616 sdkp->capacity <<= 2;
1617 else if (sector_size == 1024)
1618 sdkp->capacity <<= 1;
1619 else if (sector_size == 256)
1620 sdkp->capacity >>= 1;
1621
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001622 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 sdkp->device->sector_size = sector_size;
1624}
1625
1626/* called with buffer of length 512 */
1627static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05001628sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1629 unsigned char *buffer, int len, struct scsi_mode_data *data,
1630 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631{
James Bottomleyea73a9f2005-08-28 11:33:52 -05001632 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05001633 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001634 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635}
1636
1637/*
1638 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001639 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 */
1641static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001642sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001643{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001645 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 struct scsi_mode_data data;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001647 int old_wp = sdkp->write_prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648
1649 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001650 if (sdp->skip_ms_page_3f) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001651 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 return;
1653 }
1654
James Bottomleyea73a9f2005-08-28 11:33:52 -05001655 if (sdp->use_192_bytes_for_3f) {
1656 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657 } else {
1658 /*
1659 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1660 * We have to start carefully: some devices hang if we ask
1661 * for more than is available.
1662 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001663 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664
1665 /*
1666 * Second attempt: ask for page 0 When only page 0 is
1667 * implemented, a request for page 3F may return Sense Key
1668 * 5: Illegal Request, Sense Code 24: Invalid field in
1669 * CDB.
1670 */
1671 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001672 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673
1674 /*
1675 * Third attempt: ask 255 bytes, as we did earlier.
1676 */
1677 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001678 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1679 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 }
1681
1682 if (!scsi_status_is_good(res)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001683 sd_printk(KERN_WARNING, sdkp,
1684 "Test WP failed, assume Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 } else {
1686 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1687 set_disk_ro(sdkp->disk, sdkp->write_prot);
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001688 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1689 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1690 sdkp->write_prot ? "on" : "off");
1691 sd_printk(KERN_DEBUG, sdkp,
1692 "Mode Sense: %02x %02x %02x %02x\n",
1693 buffer[0], buffer[1], buffer[2], buffer[3]);
1694 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 }
1696}
1697
1698/*
1699 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001700 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 */
1702static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001703sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01001704{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001706 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707
Al Viro 631e8a12005-05-16 01:59:55 +01001708 int dbd;
1709 int modepage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 struct scsi_mode_data data;
1711 struct scsi_sense_hdr sshdr;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001712 int old_wce = sdkp->WCE;
1713 int old_rcd = sdkp->RCD;
1714 int old_dpofua = sdkp->DPOFUA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715
James Bottomleyea73a9f2005-08-28 11:33:52 -05001716 if (sdp->skip_ms_page_8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717 goto defaults;
1718
James Bottomleyea73a9f2005-08-28 11:33:52 -05001719 if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01001720 modepage = 6;
1721 dbd = 8;
1722 } else {
1723 modepage = 8;
1724 dbd = 0;
1725 }
1726
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 /* cautiously ask */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001728 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729
1730 if (!scsi_status_is_good(res))
1731 goto bad_sense;
1732
Al Viro6d73c852006-02-23 02:03:16 +01001733 if (!data.header_length) {
1734 modepage = 6;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001735 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
Al Viro6d73c852006-02-23 02:03:16 +01001736 }
1737
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 /* that went OK, now ask for the proper length */
1739 len = data.length;
1740
1741 /*
1742 * We're only interested in the first three bytes, actually.
1743 * But the data cache page is defined for the first 20.
1744 */
1745 if (len < 3)
1746 goto bad_sense;
1747 if (len > 20)
1748 len = 20;
1749
1750 /* Take headers and block descriptors into account */
1751 len += data.header_length + data.block_descriptor_length;
Al Viro48970802006-02-26 08:34:10 -06001752 if (len > SD_BUF_SIZE)
1753 goto bad_sense;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754
1755 /* Get the data */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001756 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757
1758 if (scsi_status_is_good(res)) {
Al Viro 631e8a12005-05-16 01:59:55 +01001759 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760
Al Viro48970802006-02-26 08:34:10 -06001761 if (offset >= SD_BUF_SIZE - 2) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001762 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
Al Viro48970802006-02-26 08:34:10 -06001763 goto defaults;
1764 }
1765
Al Viro 631e8a12005-05-16 01:59:55 +01001766 if ((buffer[offset] & 0x3f) != modepage) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001767 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
Al Viro 631e8a12005-05-16 01:59:55 +01001768 goto defaults;
1769 }
1770
1771 if (modepage == 8) {
1772 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1773 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1774 } else {
1775 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1776 sdkp->RCD = 0;
1777 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778
Tejun Heo007365a2006-01-06 09:53:52 +01001779 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1780 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001781 sd_printk(KERN_NOTICE, sdkp,
1782 "Uses READ/WRITE(6), disabling FUA\n");
Tejun Heo007365a2006-01-06 09:53:52 +01001783 sdkp->DPOFUA = 0;
1784 }
1785
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001786 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1787 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1788 sd_printk(KERN_NOTICE, sdkp,
1789 "Write cache: %s, read cache: %s, %s\n",
1790 sdkp->WCE ? "enabled" : "disabled",
1791 sdkp->RCD ? "disabled" : "enabled",
1792 sdkp->DPOFUA ? "supports DPO and FUA"
1793 : "doesn't support DPO or FUA");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
1795 return;
1796 }
1797
1798bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05001799 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 sshdr.sense_key == ILLEGAL_REQUEST &&
1801 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
Martin K. Petersene73aec82007-02-27 22:40:55 -05001802 /* Invalid field in CDB */
1803 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05001805 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806
1807defaults:
Martin K. Petersene73aec82007-02-27 22:40:55 -05001808 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 sdkp->WCE = 0;
1810 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06001811 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812}
1813
Martin K. Petersene0597d72008-07-17 04:28:34 -04001814/*
1815 * The ATO bit indicates whether the DIF application tag is available
1816 * for use by the operating system.
1817 */
1818void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1819{
1820 int res, offset;
1821 struct scsi_device *sdp = sdkp->device;
1822 struct scsi_mode_data data;
1823 struct scsi_sense_hdr sshdr;
1824
1825 if (sdp->type != TYPE_DISK)
1826 return;
1827
1828 if (sdkp->protection_type == 0)
1829 return;
1830
1831 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1832 SD_MAX_RETRIES, &data, &sshdr);
1833
1834 if (!scsi_status_is_good(res) || !data.header_length ||
1835 data.length < 6) {
1836 sd_printk(KERN_WARNING, sdkp,
1837 "getting Control mode page failed, assume no ATO\n");
1838
1839 if (scsi_sense_valid(&sshdr))
1840 sd_print_sense_hdr(sdkp, &sshdr);
1841
1842 return;
1843 }
1844
1845 offset = data.header_length + data.block_descriptor_length;
1846
1847 if ((buffer[offset] & 0x3f) != 0x0a) {
1848 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1849 return;
1850 }
1851
1852 if ((buffer[offset + 5] & 0x80) == 0)
1853 return;
1854
1855 sdkp->ATO = 1;
1856
1857 return;
1858}
1859
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860/**
Martin K. Petersend11b6912009-05-23 11:43:39 -04001861 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1862 * @disk: disk to query
1863 */
1864static void sd_read_block_limits(struct scsi_disk *sdkp)
1865{
1866 unsigned int sector_sz = sdkp->device->sector_size;
1867 char *buffer;
1868
1869 /* Block Limits VPD */
1870 buffer = scsi_get_vpd_page(sdkp->device, 0xb0);
1871
1872 if (buffer == NULL)
1873 return;
1874
1875 blk_queue_io_min(sdkp->disk->queue,
1876 get_unaligned_be16(&buffer[6]) * sector_sz);
1877 blk_queue_io_opt(sdkp->disk->queue,
1878 get_unaligned_be32(&buffer[12]) * sector_sz);
1879
1880 kfree(buffer);
1881}
1882
1883/**
Martin K. Petersen3821d762009-05-23 11:43:38 -04001884 * sd_read_block_characteristics - Query block dev. characteristics
1885 * @disk: disk to query
1886 */
1887static void sd_read_block_characteristics(struct scsi_disk *sdkp)
1888{
1889 char *buffer;
1890 u16 rot;
1891
1892 /* Block Device Characteristics VPD */
1893 buffer = scsi_get_vpd_page(sdkp->device, 0xb1);
1894
1895 if (buffer == NULL)
1896 return;
1897
1898 rot = get_unaligned_be16(&buffer[4]);
1899
1900 if (rot == 1)
1901 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
1902
1903 kfree(buffer);
1904}
1905
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04001906static int sd_try_extended_inquiry(struct scsi_device *sdp)
1907{
1908 /*
1909 * Although VPD inquiries can go to SCSI-2 type devices,
1910 * some USB ones crash on receiving them, and the pages
1911 * we currently ask for are for SPC-3 and beyond
1912 */
1913 if (sdp->scsi_level > SCSI_SPC_2)
1914 return 1;
1915 return 0;
1916}
1917
Martin K. Petersen3821d762009-05-23 11:43:38 -04001918/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 * sd_revalidate_disk - called the first time a new disk is seen,
1920 * performs disk spin up, read_capacity, etc.
1921 * @disk: struct gendisk we care about
1922 **/
1923static int sd_revalidate_disk(struct gendisk *disk)
1924{
1925 struct scsi_disk *sdkp = scsi_disk(disk);
1926 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 unsigned char *buffer;
Tejun Heo461d4e92006-01-06 09:52:55 +01001928 unsigned ordered;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001930 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1931 "sd_revalidate_disk\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932
1933 /*
1934 * If the device is offline, don't try and read capacity or any
1935 * of the other niceties.
1936 */
1937 if (!scsi_device_online(sdp))
1938 goto out;
1939
Bernhard Wallea6123f12007-05-21 17:15:26 +02001940 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 if (!buffer) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001942 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1943 "allocation failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05001944 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 }
1946
Martin K. Petersene73aec82007-02-27 22:40:55 -05001947 sd_spinup_disk(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948
1949 /*
1950 * Without media there is no reason to ask; moreover, some devices
1951 * react badly if we do.
1952 */
1953 if (sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001954 sd_read_capacity(sdkp, buffer);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04001955
1956 if (sd_try_extended_inquiry(sdp)) {
1957 sd_read_block_limits(sdkp);
1958 sd_read_block_characteristics(sdkp);
1959 }
1960
Martin K. Petersene73aec82007-02-27 22:40:55 -05001961 sd_read_write_protect_flag(sdkp, buffer);
1962 sd_read_cache_type(sdkp, buffer);
Martin K. Petersene0597d72008-07-17 04:28:34 -04001963 sd_read_app_tag_own(sdkp, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 }
Tejun Heo461d4e92006-01-06 09:52:55 +01001965
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001966 sdkp->first_scan = 0;
1967
Tejun Heo461d4e92006-01-06 09:52:55 +01001968 /*
1969 * We now have all cache related info, determine how we deal
1970 * with ordered requests. Note that as the current SCSI
1971 * dispatch function can alter request order, we cannot use
1972 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1973 */
1974 if (sdkp->WCE)
Tejun Heo007365a2006-01-06 09:53:52 +01001975 ordered = sdkp->DPOFUA
1976 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
Tejun Heo461d4e92006-01-06 09:52:55 +01001977 else
1978 ordered = QUEUE_ORDERED_DRAIN;
1979
1980 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1981
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 set_capacity(disk, sdkp->capacity);
1983 kfree(buffer);
1984
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 out:
1986 return 0;
1987}
1988
1989/**
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09001990 * sd_format_disk_name - format disk name
1991 * @prefix: name prefix - ie. "sd" for SCSI disks
1992 * @index: index of the disk to format name for
1993 * @buf: output buffer
1994 * @buflen: length of the output buffer
1995 *
1996 * SCSI disk names starts at sda. The 26th device is sdz and the
1997 * 27th is sdaa. The last one for two lettered suffix is sdzz
1998 * which is followed by sdaaa.
1999 *
2000 * This is basically 26 base counting with one extra 'nil' entry
2001 * at the beggining from the second digit on and can be
2002 * determined using similar method as 26 base conversion with the
2003 * index shifted -1 after each digit is computed.
2004 *
2005 * CONTEXT:
2006 * Don't care.
2007 *
2008 * RETURNS:
2009 * 0 on success, -errno on failure.
2010 */
2011static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2012{
2013 const int base = 'z' - 'a' + 1;
2014 char *begin = buf + strlen(prefix);
2015 char *end = buf + buflen;
2016 char *p;
2017 int unit;
2018
2019 p = end - 1;
2020 *p = '\0';
2021 unit = base;
2022 do {
2023 if (p == begin)
2024 return -EINVAL;
2025 *--p = 'a' + (index % unit);
2026 index = (index / unit) - 1;
2027 } while (index >= 0);
2028
2029 memmove(begin, p, end - p);
2030 memcpy(buf, prefix, strlen(prefix));
2031
2032 return 0;
2033}
2034
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002035/*
2036 * The asynchronous part of sd_probe
2037 */
2038static void sd_probe_async(void *data, async_cookie_t cookie)
2039{
2040 struct scsi_disk *sdkp = data;
2041 struct scsi_device *sdp;
2042 struct gendisk *gd;
2043 u32 index;
2044 struct device *dev;
2045
2046 sdp = sdkp->device;
2047 gd = sdkp->disk;
2048 index = sdkp->index;
2049 dev = &sdp->sdev_gendev;
2050
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002051 if (index < SD_MAX_DISKS) {
2052 gd->major = sd_major((index & 0xf0) >> 4);
2053 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2054 gd->minors = SD_MINORS;
2055 }
2056 gd->fops = &sd_fops;
2057 gd->private_data = &sdkp->driver;
2058 gd->queue = sdkp->device->request_queue;
2059
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002060 /* defaults, until the device tells us otherwise */
2061 sdp->sector_size = 512;
2062 sdkp->capacity = 0;
2063 sdkp->media_present = 1;
2064 sdkp->write_prot = 0;
2065 sdkp->WCE = 0;
2066 sdkp->RCD = 0;
2067 sdkp->ATO = 0;
2068 sdkp->first_scan = 1;
2069
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002070 sd_revalidate_disk(gd);
2071
2072 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2073
2074 gd->driverfs_dev = &sdp->sdev_gendev;
2075 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
2076 if (sdp->removable)
2077 gd->flags |= GENHD_FL_REMOVABLE;
2078
2079 dev_set_drvdata(dev, sdkp);
2080 add_disk(gd);
2081 sd_dif_config_host(sdkp);
2082
Martin K. Petersen3821d762009-05-23 11:43:38 -04002083 sd_revalidate_disk(gd);
2084
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002085 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2086 sdp->removable ? "removable " : "");
James Bottomleyea038f62009-08-21 09:47:54 -06002087 put_device(&sdkp->dev);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002088}
2089
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002090/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 * sd_probe - called during driver initialization and whenever a
2092 * new scsi device is attached to the system. It is called once
2093 * for each scsi device (not just disks) present.
2094 * @dev: pointer to device object
2095 *
2096 * Returns 0 if successful (or not interested in this scsi device
2097 * (e.g. scanner)); 1 when there is an error.
2098 *
2099 * Note: this function is invoked from the scsi mid-level.
2100 * This function sets up the mapping between a given
2101 * <host,channel,id,lun> (found in sdp) and new device name
2102 * (e.g. /dev/sda). More precisely it is the block device major
2103 * and minor number that is chosen here.
2104 *
2105 * Assume sd_attach is not re-entrant (for time being)
2106 * Also think about sd_attach() and sd_remove() running coincidentally.
2107 **/
2108static int sd_probe(struct device *dev)
2109{
2110 struct scsi_device *sdp = to_scsi_device(dev);
2111 struct scsi_disk *sdkp;
2112 struct gendisk *gd;
2113 u32 index;
2114 int error;
2115
2116 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01002117 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 goto out;
2119
James Bottomley9ccfc752005-10-02 11:45:08 -05002120 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2121 "sd_attach\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122
2123 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05002124 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125 if (!sdkp)
2126 goto out;
2127
Tejun Heo689d6fa2008-08-25 19:56:16 +09002128 gd = alloc_disk(SD_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129 if (!gd)
2130 goto out_free;
2131
Tejun Heof27bac22008-07-14 14:59:30 +09002132 do {
2133 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2134 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135
Tejun Heo4034cc62009-02-21 11:04:45 +09002136 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002137 error = ida_get_new(&sd_index_ida, &index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002138 spin_unlock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002139 } while (error == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141 if (error)
2142 goto out_put;
2143
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002144 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2145 if (error)
Tejun Heof27bac22008-07-14 14:59:30 +09002146 goto out_free_index;
2147
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148 sdkp->device = sdp;
2149 sdkp->driver = &sd_template;
2150 sdkp->disk = gd;
2151 sdkp->index = index;
2152 sdkp->openers = 0;
Kay Sieversc02e6002008-03-19 13:09:56 +01002153 sdkp->previous_state = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154
James Bottomley601e7632009-05-26 20:35:48 +00002155 if (!sdp->request_queue->rq_timeout) {
2156 if (sdp->type != TYPE_MOD)
2157 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2158 else
2159 blk_queue_rq_timeout(sdp->request_queue,
2160 SD_MOD_TIMEOUT);
2161 }
2162
2163 device_initialize(&sdkp->dev);
2164 sdkp->dev.parent = &sdp->sdev_gendev;
2165 sdkp->dev.class = &sd_disk_class;
2166 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2167
2168 if (device_add(&sdkp->dev))
2169 goto out_free_index;
2170
2171 get_device(&sdp->sdev_gendev);
2172
James Bottomleyea038f62009-08-21 09:47:54 -06002173 get_device(&sdkp->dev); /* prevent release before async_schedule */
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002174 async_schedule(sd_probe_async, sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175
2176 return 0;
2177
Tejun Heof27bac22008-07-14 14:59:30 +09002178 out_free_index:
Tejun Heo4034cc62009-02-21 11:04:45 +09002179 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002180 ida_remove(&sd_index_ida, index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002181 spin_unlock(&sd_index_lock);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002182 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002184 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002186 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187 return error;
2188}
2189
2190/**
2191 * sd_remove - called whenever a scsi disk (previously recognized by
2192 * sd_probe) is detached from the system. It is called (potentially
2193 * multiple times) during sd module unload.
2194 * @sdp: pointer to mid level scsi device object
2195 *
2196 * Note: this function is invoked from the scsi mid-level.
2197 * This function potentially frees up a device name (e.g. /dev/sdc)
2198 * that could be re-used by a subsequent sd_probe().
2199 * This function is not called when the built-in sd driver is "exit-ed".
2200 **/
2201static int sd_remove(struct device *dev)
2202{
James Bottomley601e7632009-05-26 20:35:48 +00002203 struct scsi_disk *sdkp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204
James Bottomley601e7632009-05-26 20:35:48 +00002205 async_synchronize_full();
2206 sdkp = dev_get_drvdata(dev);
Hannes Reineckeb3912772009-06-18 09:57:18 +02002207 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
Tony Jonesee959b02008-02-22 00:13:36 +01002208 device_del(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 del_gendisk(sdkp->disk);
2210 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002211
Arjan van de Ven0b950672006-01-11 13:16:10 +01002212 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002213 dev_set_drvdata(dev, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01002214 put_device(&sdkp->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01002215 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216
2217 return 0;
2218}
2219
2220/**
2221 * scsi_disk_release - Called to free the scsi_disk structure
Tony Jonesee959b02008-02-22 00:13:36 +01002222 * @dev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01002224 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225 * called on last put, you should always use the scsi_disk_get()
2226 * scsi_disk_put() helpers which manipulate the semaphore directly
Tony Jonesee959b02008-02-22 00:13:36 +01002227 * and never do a direct put_device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 **/
Tony Jonesee959b02008-02-22 00:13:36 +01002229static void scsi_disk_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002230{
Tony Jonesee959b02008-02-22 00:13:36 +01002231 struct scsi_disk *sdkp = to_scsi_disk(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002232 struct gendisk *disk = sdkp->disk;
2233
Tejun Heo4034cc62009-02-21 11:04:45 +09002234 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002235 ida_remove(&sd_index_ida, sdkp->index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002236 spin_unlock(&sd_index_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237
2238 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002240 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002241
2242 kfree(sdkp);
2243}
2244
James Bottomleycc5d2c82007-03-20 12:26:03 -05002245static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
Tejun Heoc3c94c52007-03-21 00:13:59 +09002246{
2247 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2248 struct scsi_sense_hdr sshdr;
James Bottomleycc5d2c82007-03-20 12:26:03 -05002249 struct scsi_device *sdp = sdkp->device;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002250 int res;
2251
2252 if (start)
2253 cmd[4] |= 1; /* START */
2254
Stefan Richterd2886ea2008-05-11 00:34:07 +02002255 if (sdp->start_stop_pwr_cond)
2256 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2257
Tejun Heoc3c94c52007-03-21 00:13:59 +09002258 if (!scsi_device_online(sdp))
2259 return -ENODEV;
2260
2261 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09002262 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002263 if (res) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002264 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2265 sd_print_result(sdkp, res);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002266 if (driver_byte(res) & DRIVER_SENSE)
James Bottomleycc5d2c82007-03-20 12:26:03 -05002267 sd_print_sense_hdr(sdkp, &sshdr);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002268 }
2269
2270 return res;
2271}
2272
Linus Torvalds1da177e2005-04-16 15:20:36 -07002273/*
2274 * Send a SYNCHRONIZE CACHE instruction down to the device through
2275 * the normal SCSI command structure. Wait for the command to
2276 * complete.
2277 */
2278static void sd_shutdown(struct device *dev)
2279{
Alan Stern39b7f1e2005-11-04 14:44:41 -05002280 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281
2282 if (!sdkp)
2283 return; /* this can happen */
2284
Alan Stern39b7f1e2005-11-04 14:44:41 -05002285 if (sdkp->WCE) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002286 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2287 sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002288 }
Tejun Heoc3c94c52007-03-21 00:13:59 +09002289
James Bottomleycc5d2c82007-03-20 12:26:03 -05002290 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2291 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2292 sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002293 }
2294
Alan Stern39b7f1e2005-11-04 14:44:41 -05002295 scsi_disk_put(sdkp);
2296}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297
Tejun Heoc3c94c52007-03-21 00:13:59 +09002298static int sd_suspend(struct device *dev, pm_message_t mesg)
2299{
Tejun Heoc3c94c52007-03-21 00:13:59 +09002300 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04002301 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002302
2303 if (!sdkp)
2304 return 0; /* this can happen */
2305
2306 if (sdkp->WCE) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002307 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
Tejun Heoc3c94c52007-03-21 00:13:59 +09002308 ret = sd_sync_cache(sdkp);
2309 if (ret)
Alan Stern09ff92f2007-05-21 09:55:04 -04002310 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002311 }
2312
Rafael J. Wysocki3a2d5b72008-02-23 19:13:25 +01002313 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002314 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2315 ret = sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002316 }
2317
Alan Stern09ff92f2007-05-21 09:55:04 -04002318done:
2319 scsi_disk_put(sdkp);
2320 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002321}
2322
2323static int sd_resume(struct device *dev)
2324{
Tejun Heoc3c94c52007-03-21 00:13:59 +09002325 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04002326 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002327
James Bottomleycc5d2c82007-03-20 12:26:03 -05002328 if (!sdkp->device->manage_start_stop)
Alan Stern09ff92f2007-05-21 09:55:04 -04002329 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002330
James Bottomleycc5d2c82007-03-20 12:26:03 -05002331 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
Alan Stern09ff92f2007-05-21 09:55:04 -04002332 ret = sd_start_stop_device(sdkp, 1);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002333
Alan Stern09ff92f2007-05-21 09:55:04 -04002334done:
2335 scsi_disk_put(sdkp);
2336 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002337}
2338
Linus Torvalds1da177e2005-04-16 15:20:36 -07002339/**
2340 * init_sd - entry point for this driver (both when built in or when
2341 * a module).
2342 *
2343 * Note: this function registers this driver with the scsi mid-level.
2344 **/
2345static int __init init_sd(void)
2346{
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002347 int majors = 0, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348
2349 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2350
2351 for (i = 0; i < SD_MAJORS; i++)
2352 if (register_blkdev(sd_major(i), "sd") == 0)
2353 majors++;
2354
2355 if (!majors)
2356 return -ENODEV;
2357
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002358 err = class_register(&sd_disk_class);
2359 if (err)
2360 goto err_out;
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002361
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002362 err = scsi_register_driver(&sd_template.gendrv);
2363 if (err)
2364 goto err_out_class;
2365
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002366 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2367 0, 0, NULL);
2368 if (!sd_cdb_cache) {
2369 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2370 goto err_out_class;
2371 }
2372
2373 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2374 if (!sd_cdb_pool) {
2375 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2376 goto err_out_cache;
2377 }
2378
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002379 return 0;
2380
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002381err_out_cache:
2382 kmem_cache_destroy(sd_cdb_cache);
2383
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002384err_out_class:
2385 class_unregister(&sd_disk_class);
2386err_out:
2387 for (i = 0; i < SD_MAJORS; i++)
2388 unregister_blkdev(sd_major(i), "sd");
2389 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390}
2391
2392/**
2393 * exit_sd - exit point for this driver (when it is a module).
2394 *
2395 * Note: this function unregisters this driver from the scsi mid-level.
2396 **/
2397static void __exit exit_sd(void)
2398{
2399 int i;
2400
2401 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2402
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002403 mempool_destroy(sd_cdb_pool);
2404 kmem_cache_destroy(sd_cdb_cache);
2405
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406 scsi_unregister_driver(&sd_template.gendrv);
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002407 class_unregister(&sd_disk_class);
2408
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409 for (i = 0; i < SD_MAJORS; i++)
2410 unregister_blkdev(sd_major(i), "sd");
2411}
2412
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413module_init(init_sd);
2414module_exit(exit_sd);
Martin K. Petersene73aec82007-02-27 22:40:55 -05002415
2416static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2417 struct scsi_sense_hdr *sshdr)
2418{
2419 sd_printk(KERN_INFO, sdkp, "");
2420 scsi_show_sense_hdr(sshdr);
2421 sd_printk(KERN_INFO, sdkp, "");
2422 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2423}
2424
2425static void sd_print_result(struct scsi_disk *sdkp, int result)
2426{
2427 sd_printk(KERN_INFO, sdkp, "");
2428 scsi_show_result(result);
2429}
2430