blob: 953773cb26d9a6204a52d56e75884622632c4c0c [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 Bottomley7404ad3b2008-08-31 10:41:52 -050050#include <linux/string_helpers.h>
Arjan van de Ven4ace92f2009-01-04 05:32:28 -080051#include <linux/async.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090052#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <asm/uaccess.h>
Dave Hansen8f76d152009-04-21 16:43:27 -070054#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56#include <scsi/scsi.h>
57#include <scsi/scsi_cmnd.h>
58#include <scsi/scsi_dbg.h>
59#include <scsi/scsi_device.h>
60#include <scsi/scsi_driver.h>
61#include <scsi/scsi_eh.h>
62#include <scsi/scsi_host.h>
63#include <scsi/scsi_ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#include <scsi/scsicam.h>
65
Martin K. Petersenaa916962008-06-17 12:47:32 -040066#include "sd.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include "scsi_logging.h"
68
Rene Hermanf018fa52006-03-08 00:14:20 -080069MODULE_AUTHOR("Eric Youngdale");
70MODULE_DESCRIPTION("SCSI disk (sd) driver");
71MODULE_LICENSE("GPL");
72
73MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040089MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
Rene Hermanf018fa52006-03-08 00:14:20 -080092
Tejun Heo870d6652008-08-25 19:47:25 +090093#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
Tejun Heof615b482008-08-25 19:47:24 +090094#define SD_MINORS 16
Tejun Heo870d6652008-08-25 19:47:25 +090095#else
Tejun Heo3e1a7ff2008-08-25 19:56:17 +090096#define SD_MINORS 0
Tejun Heo870d6652008-08-25 19:47:25 +090097#endif
98
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -050099static void sd_config_discard(struct scsi_disk *, unsigned int);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800100static int sd_revalidate_disk(struct gendisk *);
Tejun Heo72ec24b2010-05-15 20:09:32 +0200101static void sd_unlock_native_capacity(struct gendisk *disk);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800102static int sd_probe(struct device *);
103static int sd_remove(struct device *);
104static void sd_shutdown(struct device *);
105static int sd_suspend(struct device *, pm_message_t state);
106static int sd_resume(struct device *);
107static void sd_rescan(struct device *);
108static int sd_done(struct scsi_cmnd *);
109static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
Tony Jonesee959b02008-02-22 00:13:36 +0100110static void scsi_disk_release(struct device *cdev);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800111static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
112static void sd_print_result(struct scsi_disk *, int);
113
Tejun Heo4034cc62009-02-21 11:04:45 +0900114static DEFINE_SPINLOCK(sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +0900115static DEFINE_IDA(sd_index_ida);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117/* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100120static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700122static struct kmem_cache *sd_cdb_cache;
123static mempool_t *sd_cdb_pool;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400124
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600125static const char *sd_cache_types[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
128};
129
Tony Jonesee959b02008-02-22 00:13:36 +0100130static ssize_t
131sd_store_cache_type(struct device *dev, struct device_attribute *attr,
132 const char *buf, size_t count)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600133{
134 int i, ct = -1, rcd, wce, sp;
Tony Jonesee959b02008-02-22 00:13:36 +0100135 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600136 struct scsi_device *sdp = sdkp->device;
137 char buffer[64];
138 char *buffer_data;
139 struct scsi_mode_data data;
140 struct scsi_sense_hdr sshdr;
141 int len;
142
143 if (sdp->type != TYPE_DISK)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
147 return -EINVAL;
148
Tobias Klauser6391a112006-06-08 22:23:48 -0700149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700150 len = strlen(sd_cache_types[i]);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600151 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
152 buf[len] == '\n') {
153 ct = i;
154 break;
155 }
156 }
157 if (ct < 0)
158 return -EINVAL;
159 rcd = ct & 0x01 ? 1 : 0;
160 wce = ct & 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
162 SD_MAX_RETRIES, &data, NULL))
163 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600165 data.block_descriptor_length);
166 buffer_data = buffer + data.header_length +
167 data.block_descriptor_length;
168 buffer_data[2] &= ~0x05;
169 buffer_data[2] |= wce << 2 | rcd;
170 sp = buffer_data[0] & 0x80 ? 1 : 0;
171
172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
173 SD_MAX_RETRIES, &data, &sshdr)) {
174 if (scsi_sense_valid(&sshdr))
Martin K. Petersene73aec82007-02-27 22:40:55 -0500175 sd_print_sense_hdr(sdkp, &sshdr);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600176 return -EINVAL;
177 }
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -0600178 revalidate_disk(sdkp->disk);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600179 return count;
180}
181
Tony Jonesee959b02008-02-22 00:13:36 +0100182static ssize_t
183sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
184 const char *buf, size_t count)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900185{
Tony Jonesee959b02008-02-22 00:13:36 +0100186 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900187 struct scsi_device *sdp = sdkp->device;
188
189 if (!capable(CAP_SYS_ADMIN))
190 return -EACCES;
191
192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
193
194 return count;
195}
196
Tony Jonesee959b02008-02-22 00:13:36 +0100197static ssize_t
198sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
199 const char *buf, size_t count)
Brian Kinga144c5a2006-06-27 11:10:31 -0500200{
Tony Jonesee959b02008-02-22 00:13:36 +0100201 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500202 struct scsi_device *sdp = sdkp->device;
203
204 if (!capable(CAP_SYS_ADMIN))
205 return -EACCES;
206
207 if (sdp->type != TYPE_DISK)
208 return -EINVAL;
209
210 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
211
212 return count;
213}
214
Tony Jonesee959b02008-02-22 00:13:36 +0100215static ssize_t
216sd_show_cache_type(struct device *dev, struct device_attribute *attr,
217 char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600218{
Tony Jonesee959b02008-02-22 00:13:36 +0100219 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600220 int ct = sdkp->RCD + 2*sdkp->WCE;
221
222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
223}
224
Tony Jonesee959b02008-02-22 00:13:36 +0100225static ssize_t
226sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600227{
Tony Jonesee959b02008-02-22 00:13:36 +0100228 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600229
230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
231}
232
Tony Jonesee959b02008-02-22 00:13:36 +0100233static ssize_t
234sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
235 char *buf)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900236{
Tony Jonesee959b02008-02-22 00:13:36 +0100237 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900238 struct scsi_device *sdp = sdkp->device;
239
240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
241}
242
Tony Jonesee959b02008-02-22 00:13:36 +0100243static ssize_t
244sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
245 char *buf)
Brian Kinga144c5a2006-06-27 11:10:31 -0500246{
Tony Jonesee959b02008-02-22 00:13:36 +0100247 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500248
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250}
251
Martin K. Petersene0597d72008-07-17 04:28:34 -0400252static ssize_t
253sd_show_protection_type(struct device *dev, struct device_attribute *attr,
254 char *buf)
255{
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257
258 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
259}
260
261static ssize_t
Martin K. Petersen518fa8e2010-10-08 01:36:24 -0400262sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
263 char *buf)
264{
265 struct scsi_disk *sdkp = to_scsi_disk(dev);
266 struct scsi_device *sdp = sdkp->device;
267 unsigned int dif, dix;
268
269 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
270 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
271
272 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
273 dif = 0;
274 dix = 1;
275 }
276
277 if (!dif && !dix)
278 return snprintf(buf, 20, "none\n");
279
280 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
281}
282
283static ssize_t
Martin K. Petersene0597d72008-07-17 04:28:34 -0400284sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
285 char *buf)
286{
287 struct scsi_disk *sdkp = to_scsi_disk(dev);
288
289 return snprintf(buf, 20, "%u\n", sdkp->ATO);
290}
291
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500292static ssize_t
293sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
294 char *buf)
295{
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
297
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500298 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
299}
300
301static const char *lbp_mode[] = {
302 [SD_LBP_FULL] = "full",
303 [SD_LBP_UNMAP] = "unmap",
304 [SD_LBP_WS16] = "writesame_16",
305 [SD_LBP_WS10] = "writesame_10",
306 [SD_LBP_ZERO] = "writesame_zero",
307 [SD_LBP_DISABLE] = "disabled",
308};
309
310static ssize_t
311sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
312 char *buf)
313{
314 struct scsi_disk *sdkp = to_scsi_disk(dev);
315
316 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
317}
318
319static ssize_t
320sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
321 const char *buf, size_t count)
322{
323 struct scsi_disk *sdkp = to_scsi_disk(dev);
324 struct scsi_device *sdp = sdkp->device;
325
326 if (!capable(CAP_SYS_ADMIN))
327 return -EACCES;
328
329 if (sdp->type != TYPE_DISK)
330 return -EINVAL;
331
332 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
333 sd_config_discard(sdkp, SD_LBP_UNMAP);
334 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
335 sd_config_discard(sdkp, SD_LBP_WS16);
336 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
337 sd_config_discard(sdkp, SD_LBP_WS10);
338 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
339 sd_config_discard(sdkp, SD_LBP_ZERO);
340 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
341 sd_config_discard(sdkp, SD_LBP_DISABLE);
342 else
343 return -EINVAL;
344
345 return count;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500346}
347
Tony Jonesee959b02008-02-22 00:13:36 +0100348static struct device_attribute sd_disk_attrs[] = {
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600349 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
350 sd_store_cache_type),
351 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
Brian Kinga144c5a2006-06-27 11:10:31 -0500352 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
353 sd_store_allow_restart),
Tejun Heoc3c94c52007-03-21 00:13:59 +0900354 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
355 sd_store_manage_start_stop),
Martin K. Petersene0597d72008-07-17 04:28:34 -0400356 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
Martin K. Petersen518fa8e2010-10-08 01:36:24 -0400357 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
Martin K. Petersene0597d72008-07-17 04:28:34 -0400358 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500359 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500360 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
361 sd_store_provisioning_mode),
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600362 __ATTR_NULL,
363};
364
365static struct class sd_disk_class = {
366 .name = "scsi_disk",
367 .owner = THIS_MODULE,
Tony Jonesee959b02008-02-22 00:13:36 +0100368 .dev_release = scsi_disk_release,
369 .dev_attrs = sd_disk_attrs,
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600370};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372static struct scsi_driver sd_template = {
373 .owner = THIS_MODULE,
374 .gendrv = {
375 .name = "sd",
376 .probe = sd_probe,
377 .remove = sd_remove,
Tejun Heoc3c94c52007-03-21 00:13:59 +0900378 .suspend = sd_suspend,
379 .resume = sd_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 .shutdown = sd_shutdown,
381 },
382 .rescan = sd_rescan,
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800383 .done = sd_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384};
385
386/*
387 * Device no to disk mapping:
388 *
389 * major disc2 disc p1
390 * |............|.............|....|....| <- dev_t
391 * 31 20 19 8 7 4 3 0
392 *
393 * Inside a major, we have 16k disks, however mapped non-
394 * contiguously. The first 16 disks are for major0, the next
395 * ones with major1, ... Disk 256 is for major0 again, disk 272
396 * for major1, ...
397 * As we stay compatible with our numbering scheme, we can reuse
398 * the well-know SCSI majors 8, 65--71, 136--143.
399 */
400static int sd_major(int major_idx)
401{
402 switch (major_idx) {
403 case 0:
404 return SCSI_DISK0_MAJOR;
405 case 1 ... 7:
406 return SCSI_DISK1_MAJOR + major_idx - 1;
407 case 8 ... 15:
408 return SCSI_DISK8_MAJOR + major_idx - 8;
409 default:
410 BUG();
411 return 0; /* shut up gcc */
412 }
413}
414
Alan Stern39b7f1e2005-11-04 14:44:41 -0500415static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
417 struct scsi_disk *sdkp = NULL;
418
Alan Stern39b7f1e2005-11-04 14:44:41 -0500419 if (disk->private_data) {
420 sdkp = scsi_disk(disk);
421 if (scsi_device_get(sdkp->device) == 0)
Tony Jonesee959b02008-02-22 00:13:36 +0100422 get_device(&sdkp->dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500423 else
424 sdkp = NULL;
425 }
426 return sdkp;
427}
428
429static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
430{
431 struct scsi_disk *sdkp;
432
Arjan van de Ven0b950672006-01-11 13:16:10 +0100433 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500434 sdkp = __scsi_disk_get(disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100435 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 return sdkp;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500437}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
Alan Stern39b7f1e2005-11-04 14:44:41 -0500439static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
440{
441 struct scsi_disk *sdkp;
442
Arjan van de Ven0b950672006-01-11 13:16:10 +0100443 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500444 sdkp = dev_get_drvdata(dev);
445 if (sdkp)
446 sdkp = __scsi_disk_get(sdkp->disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100447 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 return sdkp;
449}
450
451static void scsi_disk_put(struct scsi_disk *sdkp)
452{
453 struct scsi_device *sdev = sdkp->device;
454
Arjan van de Ven0b950672006-01-11 13:16:10 +0100455 mutex_lock(&sd_ref_mutex);
Tony Jonesee959b02008-02-22 00:13:36 +0100456 put_device(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100458 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
460
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400461static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
462{
463 unsigned int prot_op = SCSI_PROT_NORMAL;
464 unsigned int dix = scsi_prot_sg_count(scmd);
465
466 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
467 if (dif && dix)
468 prot_op = SCSI_PROT_READ_PASS;
469 else if (dif && !dix)
470 prot_op = SCSI_PROT_READ_STRIP;
471 else if (!dif && dix)
472 prot_op = SCSI_PROT_READ_INSERT;
473 } else {
474 if (dif && dix)
475 prot_op = SCSI_PROT_WRITE_PASS;
476 else if (dif && !dix)
477 prot_op = SCSI_PROT_WRITE_INSERT;
478 else if (!dif && dix)
479 prot_op = SCSI_PROT_WRITE_STRIP;
480 }
481
482 scsi_set_prot_op(scmd, prot_op);
483 scsi_set_prot_type(scmd, dif);
484}
485
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500486static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
487{
488 struct request_queue *q = sdkp->disk->queue;
489 unsigned int logical_block_size = sdkp->device->sector_size;
490 unsigned int max_blocks = 0;
491
492 q->limits.discard_zeroes_data = sdkp->lbprz;
Martin K. Petersen2a8cfad2011-05-18 00:31:07 -0400493 q->limits.discard_alignment = sdkp->unmap_alignment *
494 logical_block_size;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500495 q->limits.discard_granularity =
496 max(sdkp->physical_block_size,
497 sdkp->unmap_granularity * logical_block_size);
498
499 switch (mode) {
500
501 case SD_LBP_DISABLE:
502 q->limits.max_discard_sectors = 0;
503 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
504 return;
505
506 case SD_LBP_UNMAP:
507 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
508 break;
509
510 case SD_LBP_WS16:
511 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
512 break;
513
514 case SD_LBP_WS10:
515 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
516 break;
517
518 case SD_LBP_ZERO:
519 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
520 q->limits.discard_zeroes_data = 1;
521 break;
522 }
523
524 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
525 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
526
527 sdkp->provisioning_mode = mode;
528}
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530/**
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200531 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
532 * @sdp: scsi device to operate one
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500533 * @rq: Request to prepare
534 *
535 * Will issue either UNMAP or WRITE SAME(16) depending on preference
536 * indicated by target device.
537 **/
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200538static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500539{
540 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
541 struct bio *bio = rq->bio;
542 sector_t sector = bio->bi_sector;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200543 unsigned int nr_sectors = bio_sectors(bio);
544 unsigned int len;
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900545 int ret;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500546 char *buf;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200547 struct page *page;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500548
549 if (sdkp->device->sector_size == 4096) {
550 sector >>= 3;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200551 nr_sectors >>= 3;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500552 }
553
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500554 rq->timeout = SD_TIMEOUT;
555
556 memset(rq->cmd, 0, rq->cmd_len);
557
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200558 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
559 if (!page)
560 return BLKPREP_DEFER;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500561
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500562 switch (sdkp->provisioning_mode) {
563 case SD_LBP_UNMAP:
564 buf = page_address(page);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200565
566 rq->cmd_len = 10;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500567 rq->cmd[0] = UNMAP;
568 rq->cmd[8] = 24;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500569
570 put_unaligned_be16(6 + 16, &buf[0]);
571 put_unaligned_be16(16, &buf[2]);
572 put_unaligned_be64(sector, &buf[8]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200573 put_unaligned_be32(nr_sectors, &buf[16]);
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500574
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200575 len = 24;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500576 break;
577
578 case SD_LBP_WS16:
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200579 rq->cmd_len = 16;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500580 rq->cmd[0] = WRITE_SAME_16;
581 rq->cmd[1] = 0x8; /* UNMAP */
582 put_unaligned_be64(sector, &rq->cmd[2]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200583 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
584
585 len = sdkp->device->sector_size;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500586 break;
587
588 case SD_LBP_WS10:
589 case SD_LBP_ZERO:
590 rq->cmd_len = 10;
591 rq->cmd[0] = WRITE_SAME;
592 if (sdkp->provisioning_mode == SD_LBP_WS10)
593 rq->cmd[1] = 0x8; /* UNMAP */
594 put_unaligned_be32(sector, &rq->cmd[2]);
595 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
596
597 len = sdkp->device->sector_size;
598 break;
599
600 default:
Martin K. Petersen09b9cc42011-03-22 00:27:42 -0400601 ret = BLKPREP_KILL;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500602 goto out;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500603 }
604
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200605 blk_add_request_payload(rq, page, len);
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900606 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
607 rq->buffer = page_address(page);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500608
609out:
FUJITA Tomonori610a6342010-07-08 10:16:17 +0200610 if (ret != BLKPREP_OK) {
611 __free_page(page);
612 rq->buffer = NULL;
613 }
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900614 return ret;
615}
616
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900617static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
618{
Mike Christiee3b3e622010-08-11 11:06:25 -0500619 rq->timeout = SD_FLUSH_TIMEOUT;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900620 rq->retries = SD_MAX_RETRIES;
621 rq->cmd[0] = SYNCHRONIZE_CACHE;
622 rq->cmd_len = 10;
623
624 return scsi_setup_blk_pc_cmnd(sdp, rq);
625}
626
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900627static void sd_unprep_fn(struct request_queue *q, struct request *rq)
628{
FUJITA Tomonori610a6342010-07-08 10:16:17 +0200629 if (rq->cmd_flags & REQ_DISCARD) {
630 free_page((unsigned long)rq->buffer);
631 rq->buffer = NULL;
632 }
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500633}
634
635/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 * sd_init_command - build a scsi (read or write) command from
637 * information in the request structure.
638 * @SCpnt: pointer to mid-level's per scsi command structure that
639 * contains request and into which the scsi command is written
640 *
641 * Returns 1 if successful and 0 if error (or cannot be done now).
642 **/
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500643static int sd_prep_fn(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500645 struct scsi_cmnd *SCpnt;
646 struct scsi_device *sdp = q->queuedata;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100647 struct gendisk *disk = rq->rq_disk;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400648 struct scsi_disk *sdkp;
Tejun Heo83096eb2009-05-07 22:24:39 +0900649 sector_t block = blk_rq_pos(rq);
Linus Torvalds18351072008-08-05 21:42:21 -0700650 sector_t threshold;
Tejun Heo83096eb2009-05-07 22:24:39 +0900651 unsigned int this_count = blk_rq_sectors(rq);
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400652 int ret, host_dif;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400653 unsigned char protect;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500654
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500655 /*
656 * Discard request come in as REQ_TYPE_FS but we turn them into
657 * block PC requests to make life easier.
658 */
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200659 if (rq->cmd_flags & REQ_DISCARD) {
660 ret = scsi_setup_discard_cmnd(sdp, rq);
661 goto out;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900662 } else if (rq->cmd_flags & REQ_FLUSH) {
663 ret = scsi_setup_flush_cmnd(sdp, rq);
664 goto out;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200665 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500666 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
667 goto out;
668 } else if (rq->cmd_type != REQ_TYPE_FS) {
669 ret = BLKPREP_KILL;
670 goto out;
671 }
672 ret = scsi_setup_fs_cmnd(sdp, rq);
673 if (ret != BLKPREP_OK)
674 goto out;
675 SCpnt = rq->special;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400676 sdkp = scsi_disk(disk);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500677
678 /* from here on until we're complete, any goto out
679 * is used for a killable error condition */
680 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500682 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
683 "sd_init_command: block=%llu, "
684 "count=%d\n",
685 (unsigned long long)block,
686 this_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
688 if (!sdp || !scsi_device_online(sdp) ||
Tejun Heo83096eb2009-05-07 22:24:39 +0900689 block + blk_rq_sectors(rq) > get_capacity(disk)) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500690 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900691 "Finishing %u sectors\n",
692 blk_rq_sectors(rq)));
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500693 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
694 "Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500695 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 }
697
698 if (sdp->changed) {
699 /*
700 * quietly refuse to do anything to a changed disc until
701 * the changed bit has been reset
702 */
Alan Stern3ff55882010-09-07 11:44:01 -0400703 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500704 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 }
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500706
Hans de Goedea0899d42008-01-20 11:12:26 +0100707 /*
Linus Torvalds18351072008-08-05 21:42:21 -0700708 * Some SD card readers can't handle multi-sector accesses which touch
709 * the last one or two hardware sectors. Split accesses as needed.
Hans de Goedea0899d42008-01-20 11:12:26 +0100710 */
Linus Torvalds18351072008-08-05 21:42:21 -0700711 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
712 (sdp->sector_size / 512);
713
714 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
715 if (block < threshold) {
716 /* Access up to the threshold but not beyond */
717 this_count = threshold - block;
718 } else {
719 /* Access only a single hardware sector */
720 this_count = sdp->sector_size / 512;
721 }
722 }
Hans de Goedea0899d42008-01-20 11:12:26 +0100723
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500724 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
725 (unsigned long long)block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
727 /*
728 * If we have a 1K hardware sectorsize, prevent access to single
729 * 512 byte sectors. In theory we could handle this - in fact
730 * the scsi cdrom driver must be able to handle this because
731 * we typically use 1K blocksizes, and cdroms typically have
732 * 2K hardware sectorsizes. Of course, things are simpler
733 * with the cdrom, since it is read-only. For performance
734 * reasons, the filesystems should be able to handle this
735 * and not force the scsi disk driver to use bounce buffers
736 * for this.
737 */
738 if (sdp->sector_size == 1024) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900739 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500740 scmd_printk(KERN_ERR, SCpnt,
741 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500742 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 } else {
744 block = block >> 1;
745 this_count = this_count >> 1;
746 }
747 }
748 if (sdp->sector_size == 2048) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900749 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500750 scmd_printk(KERN_ERR, SCpnt,
751 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500752 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 } else {
754 block = block >> 2;
755 this_count = this_count >> 2;
756 }
757 }
758 if (sdp->sector_size == 4096) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900759 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500760 scmd_printk(KERN_ERR, SCpnt,
761 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500762 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 } else {
764 block = block >> 3;
765 this_count = this_count >> 3;
766 }
767 }
768 if (rq_data_dir(rq) == WRITE) {
769 if (!sdp->writeable) {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500770 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 }
772 SCpnt->cmnd[0] = WRITE_6;
773 SCpnt->sc_data_direction = DMA_TO_DEVICE;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400774
775 if (blk_integrity_rq(rq) &&
776 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
777 goto out;
778
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 } else if (rq_data_dir(rq) == READ) {
780 SCpnt->cmnd[0] = READ_6;
781 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
782 } else {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500783 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500784 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 }
786
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500787 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900788 "%s %d/%u 512 byte blocks.\n",
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500789 (rq_data_dir(rq) == WRITE) ?
790 "writing" : "reading", this_count,
Tejun Heo83096eb2009-05-07 22:24:39 +0900791 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400793 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400794 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
795 if (host_dif)
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400796 protect = 1 << 5;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400797 else
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400798 protect = 0;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400799
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400800 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
801 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
802
803 if (unlikely(SCpnt->cmnd == NULL)) {
804 ret = BLKPREP_DEFER;
805 goto out;
806 }
807
808 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
809 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
810 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
811 SCpnt->cmnd[7] = 0x18;
812 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200813 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400814
815 /* LBA */
816 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
817 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
818 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
819 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
820 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
821 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
822 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
823 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
824
825 /* Expected Indirect LBA */
826 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
827 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
828 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
829 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
830
831 /* Transfer length */
832 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
833 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
834 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
835 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
836 } else if (block > 0xffffffff) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 SCpnt->cmnd[0] += READ_16 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200838 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
840 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
841 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
842 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
843 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
844 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
845 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
846 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
847 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
848 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
849 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
850 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
851 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
852 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400853 scsi_device_protection(SCpnt->device) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 SCpnt->device->use_10_for_rw) {
855 if (this_count > 0xffff)
856 this_count = 0xffff;
857
858 SCpnt->cmnd[0] += READ_10 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200859 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
861 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
862 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
863 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
864 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
865 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
866 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
867 } else {
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200868 if (unlikely(rq->cmd_flags & REQ_FUA)) {
Tejun Heo007365a2006-01-06 09:53:52 +0100869 /*
870 * This happens only if this drive failed
871 * 10byte rw command with ILLEGAL_REQUEST
872 * during operation and thus turned off
873 * use_10_for_rw.
874 */
Martin K. Petersene73aec82007-02-27 22:40:55 -0500875 scmd_printk(KERN_ERR, SCpnt,
876 "FUA write on READ/WRITE(6) drive\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500877 goto out;
Tejun Heo007365a2006-01-06 09:53:52 +0100878 }
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
881 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
882 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
883 SCpnt->cmnd[4] = (unsigned char) this_count;
884 SCpnt->cmnd[5] = 0;
885 }
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200886 SCpnt->sdb.length = this_count * sdp->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400888 /* If DIF or DIX is enabled, tell HBA how to handle request */
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400889 if (host_dif || scsi_prot_sg_count(SCpnt))
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400890 sd_prot_op(SCpnt, host_dif);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 /*
893 * We shouldn't disconnect in the middle of a sector, so with a dumb
894 * host adapter, it's safe to assume that we can at least transfer
895 * this many bytes between each connect / disconnect.
896 */
897 SCpnt->transfersize = sdp->sector_size;
898 SCpnt->underflow = this_count << 9;
899 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
901 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 * This indicates that the command is ready from our end to be
903 * queued.
904 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500905 ret = BLKPREP_OK;
906 out:
907 return scsi_prep_return(q, rq, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908}
909
910/**
911 * sd_open - open a scsi disk device
912 * @inode: only i_rdev member may be used
913 * @filp: only f_mode and f_flags may be used
914 *
915 * Returns 0 if successful. Returns a negated errno value in case
916 * of error.
917 *
918 * Note: This can be called from a user context (e.g. fsck(1) )
919 * or from within the kernel (e.g. as a result of a mount(1) ).
920 * In the latter case @inode and @filp carry an abridged amount
921 * of information as noted above.
Arnd Bergmann409f3492010-07-07 16:51:29 +0200922 *
923 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 **/
Al Viro0338e292008-03-02 10:41:04 -0500925static int sd_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926{
Al Viro0338e292008-03-02 10:41:04 -0500927 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 struct scsi_device *sdev;
929 int retval;
930
Al Viro0338e292008-03-02 10:41:04 -0500931 if (!sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 return -ENXIO;
933
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500934 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
936 sdev = sdkp->device;
937
Alan Stern478a8a02010-06-16 14:52:17 -0400938 retval = scsi_autopm_get_device(sdev);
939 if (retval)
940 goto error_autopm;
941
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 /*
943 * If the device is in error recovery, wait until it is done.
944 * If the device is offline, then disallow any access to it.
945 */
946 retval = -ENXIO;
947 if (!scsi_block_when_processing_errors(sdev))
948 goto error_out;
949
950 if (sdev->removable || sdkp->write_prot)
Al Viro0338e292008-03-02 10:41:04 -0500951 check_disk_change(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 /*
954 * If the drive is empty, just let the open fail.
955 */
956 retval = -ENOMEDIUM;
Al Viro0338e292008-03-02 10:41:04 -0500957 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 goto error_out;
959
960 /*
961 * If the device has the write protect tab set, have the open fail
962 * if the user expects to be able to write to the thing.
963 */
964 retval = -EROFS;
Al Viro0338e292008-03-02 10:41:04 -0500965 if (sdkp->write_prot && (mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 goto error_out;
967
968 /*
969 * It is possible that the disk changing stuff resulted in
970 * the device being taken offline. If this is the case,
971 * report this to the user, and don't pretend that the
972 * open actually succeeded.
973 */
974 retval = -ENXIO;
975 if (!scsi_device_online(sdev))
976 goto error_out;
977
Arnd Bergmann409f3492010-07-07 16:51:29 +0200978 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (scsi_block_when_processing_errors(sdev))
980 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
981 }
982
983 return 0;
984
985error_out:
Alan Stern478a8a02010-06-16 14:52:17 -0400986 scsi_autopm_put_device(sdev);
987error_autopm:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 scsi_disk_put(sdkp);
989 return retval;
990}
991
992/**
993 * sd_release - invoked when the (last) close(2) is called on this
994 * scsi disk.
995 * @inode: only i_rdev member may be used
996 * @filp: only f_mode and f_flags may be used
997 *
998 * Returns 0.
999 *
1000 * Note: may block (uninterruptible) if error recovery is underway
1001 * on this disk.
Arnd Bergmann409f3492010-07-07 16:51:29 +02001002 *
1003 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 **/
Al Viro0338e292008-03-02 10:41:04 -05001005static int sd_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 struct scsi_disk *sdkp = scsi_disk(disk);
1008 struct scsi_device *sdev = sdkp->device;
1009
James Bottomley56937f72007-03-11 12:25:33 -05001010 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
Alan Stern7e443312010-09-07 11:27:52 -04001012 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 if (scsi_block_when_processing_errors(sdev))
1014 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1015 }
1016
1017 /*
1018 * XXX and what if there are packets in flight and this close()
1019 * XXX is followed by a "rmmod sd_mod"?
1020 */
Alan Stern478a8a02010-06-16 14:52:17 -04001021
1022 scsi_autopm_put_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 scsi_disk_put(sdkp);
1024 return 0;
1025}
1026
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001027static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028{
1029 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1030 struct scsi_device *sdp = sdkp->device;
1031 struct Scsi_Host *host = sdp->host;
1032 int diskinfo[4];
1033
1034 /* default to most commonly used values */
1035 diskinfo[0] = 0x40; /* 1 << 6 */
1036 diskinfo[1] = 0x20; /* 1 << 5 */
1037 diskinfo[2] = sdkp->capacity >> 11;
1038
1039 /* override with calculated, extended default, or driver values */
1040 if (host->hostt->bios_param)
1041 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1042 else
1043 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1044
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001045 geo->heads = diskinfo[0];
1046 geo->sectors = diskinfo[1];
1047 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 return 0;
1049}
1050
1051/**
1052 * sd_ioctl - process an ioctl
1053 * @inode: only i_rdev/i_bdev members may be used
1054 * @filp: only f_mode and f_flags may be used
1055 * @cmd: ioctl command number
1056 * @arg: this is third argument given to ioctl(2) system call.
1057 * Often contains a pointer.
1058 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001059 * Returns 0 if successful (some ioctls return positive numbers on
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 * success as well). Returns a negated errno value in case of error.
1061 *
1062 * Note: most ioctls are forward onto the block subsystem or further
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +02001063 * down in the scsi subsystem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 **/
Al Viro0338e292008-03-02 10:41:04 -05001065static int sd_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 unsigned int cmd, unsigned long arg)
1067{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 struct gendisk *disk = bdev->bd_disk;
1069 struct scsi_device *sdp = scsi_disk(disk)->device;
1070 void __user *p = (void __user *)arg;
1071 int error;
1072
1073 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
1074 disk->disk_name, cmd));
1075
1076 /*
1077 * If we are in the middle of error recovery, don't let anyone
1078 * else try and use this device. Also, if error recovery fails, it
1079 * may try and take the device offline, in which case all further
1080 * access to the device is prohibited.
1081 */
Al Viro83ff6fe2008-03-02 08:15:49 -05001082 error = scsi_nonblockable_ioctl(sdp, cmd, p,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +01001083 (mode & FMODE_NDELAY) != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 if (!scsi_block_when_processing_errors(sdp) || !error)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001085 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 /*
1088 * Send SCSI addressing ioctls directly to mid level, send other
1089 * ioctls to block level and then onto mid level if they can't be
1090 * resolved.
1091 */
1092 switch (cmd) {
1093 case SCSI_IOCTL_GET_IDLUN:
1094 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001095 error = scsi_ioctl(sdp, cmd, p);
1096 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 default:
Al Viro0338e292008-03-02 10:41:04 -05001098 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 if (error != -ENOTTY)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001100 break;
1101 error = scsi_ioctl(sdp, cmd, p);
1102 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 }
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001104out:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001105 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106}
1107
1108static void set_media_not_present(struct scsi_disk *sdkp)
1109{
Tejun Heo2bae0092010-12-18 18:42:23 +01001110 if (sdkp->media_present)
1111 sdkp->device->changed = 1;
1112
1113 if (sdkp->device->removable) {
1114 sdkp->media_present = 0;
1115 sdkp->capacity = 0;
1116 }
1117}
1118
1119static int media_not_present(struct scsi_disk *sdkp,
1120 struct scsi_sense_hdr *sshdr)
1121{
1122 if (!scsi_sense_valid(sshdr))
1123 return 0;
1124
1125 /* not invoked for commands that could return deferred errors */
1126 switch (sshdr->sense_key) {
1127 case UNIT_ATTENTION:
1128 case NOT_READY:
1129 /* medium not present */
1130 if (sshdr->asc == 0x3A) {
1131 set_media_not_present(sdkp);
1132 return 1;
1133 }
1134 }
1135 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136}
1137
1138/**
Tejun Heo2bae0092010-12-18 18:42:23 +01001139 * sd_check_events - check media events
1140 * @disk: kernel device descriptor
1141 * @clearing: disk events currently being cleared
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 *
Tejun Heo2bae0092010-12-18 18:42:23 +01001143 * Returns mask of DISK_EVENT_*.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 *
1145 * Note: this function is invoked from the block subsystem.
1146 **/
Tejun Heo2bae0092010-12-18 18:42:23 +01001147static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148{
1149 struct scsi_disk *sdkp = scsi_disk(disk);
1150 struct scsi_device *sdp = sdkp->device;
James Bottomley001aac22007-12-02 19:10:40 +02001151 struct scsi_sense_hdr *sshdr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 int retval;
1153
Tejun Heo2bae0092010-12-18 18:42:23 +01001154 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155
1156 /*
1157 * If the device is offline, don't send any commands - just pretend as
1158 * if the command failed. If the device ever comes back online, we
1159 * can deal with it then. It is only because of unrecoverable errors
1160 * that we would ever take a device offline in the first place.
1161 */
Kay Sievers285e9672007-08-14 14:10:39 +02001162 if (!scsi_device_online(sdp)) {
1163 set_media_not_present(sdkp);
Kay Sievers285e9672007-08-14 14:10:39 +02001164 goto out;
1165 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
1167 /*
1168 * Using TEST_UNIT_READY enables differentiation between drive with
1169 * no cartridge loaded - NOT READY, drive with changed cartridge -
1170 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1171 *
1172 * Drives that auto spin down. eg iomega jaz 1G, will be started
1173 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1174 * sd_revalidate() is called.
1175 */
1176 retval = -ENODEV;
Kay Sievers285e9672007-08-14 14:10:39 +02001177
James Bottomley001aac22007-12-02 19:10:40 +02001178 if (scsi_block_when_processing_errors(sdp)) {
1179 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1180 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1181 sshdr);
1182 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
Tejun Heo2bae0092010-12-18 18:42:23 +01001184 /* failed to execute TUR, assume media not present */
1185 if (host_byte(retval)) {
Kay Sievers285e9672007-08-14 14:10:39 +02001186 set_media_not_present(sdkp);
Kay Sievers285e9672007-08-14 14:10:39 +02001187 goto out;
1188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
Tejun Heo2bae0092010-12-18 18:42:23 +01001190 if (media_not_present(sdkp, sshdr))
1191 goto out;
1192
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 /*
1194 * For removable scsi disk we have to recognise the presence
Tejun Heo2bae0092010-12-18 18:42:23 +01001195 * of a disk in the drive.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 */
Tejun Heo2bae0092010-12-18 18:42:23 +01001197 if (!sdkp->media_present)
1198 sdp->changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 sdkp->media_present = 1;
Kay Sievers285e9672007-08-14 14:10:39 +02001200out:
Alan Stern3ff55882010-09-07 11:44:01 -04001201 /*
Tejun Heo2bae0092010-12-18 18:42:23 +01001202 * sdp->changed is set under the following conditions:
Alan Stern3ff55882010-09-07 11:44:01 -04001203 *
Tejun Heo2bae0092010-12-18 18:42:23 +01001204 * Medium present state has changed in either direction.
1205 * Device has indicated UNIT_ATTENTION.
Alan Stern3ff55882010-09-07 11:44:01 -04001206 */
James Bottomley001aac22007-12-02 19:10:40 +02001207 kfree(sshdr);
Tejun Heo2bae0092010-12-18 18:42:23 +01001208 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1209 sdp->changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211}
1212
Martin K. Petersene73aec82007-02-27 22:40:55 -05001213static int sd_sync_cache(struct scsi_disk *sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 int retries, res;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001216 struct scsi_device *sdp = sdkp->device;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001217 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
1219 if (!scsi_device_online(sdp))
1220 return -ENODEV;
1221
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 for (retries = 3; retries > 0; --retries) {
1224 unsigned char cmd[10] = { 0 };
1225
1226 cmd[0] = SYNCHRONIZE_CACHE;
1227 /*
1228 * Leave the rest of the command zero to indicate
1229 * flush everything.
1230 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001231 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
Mike Christiee3b3e622010-08-11 11:06:25 -05001232 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001233 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 break;
1235 }
1236
Martin K. Petersene73aec82007-02-27 22:40:55 -05001237 if (res) {
1238 sd_print_result(sdkp, res);
1239 if (driver_byte(res) & DRIVER_SENSE)
1240 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 }
1242
Tejun Heo37210502007-03-21 00:07:18 +09001243 if (res)
1244 return -EIO;
1245 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246}
1247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248static void sd_rescan(struct device *dev)
1249{
Alan Stern39b7f1e2005-11-04 14:44:41 -05001250 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1251
1252 if (sdkp) {
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -06001253 revalidate_disk(sdkp->disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001254 scsi_disk_put(sdkp);
1255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256}
1257
1258
1259#ifdef CONFIG_COMPAT
1260/*
1261 * This gets directly called from VFS. When the ioctl
1262 * is not recognized we go back to the other translation paths.
1263 */
Al Viro0338e292008-03-02 10:41:04 -05001264static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1265 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266{
Al Viro0338e292008-03-02 10:41:04 -05001267 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268
1269 /*
1270 * If we are in the middle of error recovery, don't let anyone
1271 * else try and use this device. Also, if error recovery fails, it
1272 * may try and take the device offline, in which case all further
1273 * access to the device is prohibited.
1274 */
1275 if (!scsi_block_when_processing_errors(sdev))
1276 return -ENODEV;
1277
1278 if (sdev->host->hostt->compat_ioctl) {
1279 int ret;
1280
1281 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1282
1283 return ret;
1284 }
1285
1286 /*
1287 * Let the static ioctl translation table take care of it.
1288 */
1289 return -ENOIOCTLCMD;
1290}
1291#endif
1292
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07001293static const struct block_device_operations sd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 .owner = THIS_MODULE,
Al Viro0338e292008-03-02 10:41:04 -05001295 .open = sd_open,
1296 .release = sd_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001297 .ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001298 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299#ifdef CONFIG_COMPAT
Al Viro0338e292008-03-02 10:41:04 -05001300 .compat_ioctl = sd_compat_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301#endif
Tejun Heo2bae0092010-12-18 18:42:23 +01001302 .check_events = sd_check_events,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 .revalidate_disk = sd_revalidate_disk,
Tejun Heo72ec24b2010-05-15 20:09:32 +02001304 .unlock_native_capacity = sd_unlock_native_capacity,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305};
1306
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001307static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1308{
Tejun Heo83096eb2009-05-07 22:24:39 +09001309 u64 start_lba = blk_rq_pos(scmd->request);
1310 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001311 u64 bad_lba;
1312 int info_valid;
James Bottomleya8733c72010-12-17 15:36:34 -05001313 /*
1314 * resid is optional but mostly filled in. When it's unused,
1315 * its value is zero, so we assume the whole buffer transferred
1316 */
1317 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1318 unsigned int good_bytes;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001319
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001320 if (scmd->request->cmd_type != REQ_TYPE_FS)
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001321 return 0;
1322
1323 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1324 SCSI_SENSE_BUFFERSIZE,
1325 &bad_lba);
1326 if (!info_valid)
1327 return 0;
1328
1329 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1330 return 0;
1331
1332 if (scmd->device->sector_size < 512) {
1333 /* only legitimate sector_size here is 256 */
1334 start_lba <<= 1;
1335 end_lba <<= 1;
1336 } else {
1337 /* be careful ... don't want any overflows */
1338 u64 factor = scmd->device->sector_size / 512;
1339 do_div(start_lba, factor);
1340 do_div(end_lba, factor);
1341 }
1342
1343 /* The bad lba was reported incorrectly, we have no idea where
1344 * the error is.
1345 */
1346 if (bad_lba < start_lba || bad_lba >= end_lba)
1347 return 0;
1348
1349 /* This computation should always be done in terms of
1350 * the resolution of the device's medium.
1351 */
James Bottomleya8733c72010-12-17 15:36:34 -05001352 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1353 return min(good_bytes, transferred);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001354}
1355
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356/**
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001357 * sd_done - bottom half handler: called when the lower level
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 * driver has completed (successfully or otherwise) a scsi command.
1359 * @SCpnt: mid-level's per command structure.
1360 *
1361 * Note: potentially run from within an ISR. Must not block.
1362 **/
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001363static int sd_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364{
1365 int result = SCpnt->result;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001366 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 struct scsi_sense_hdr sshdr;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001368 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 int sense_valid = 0;
1370 int sense_deferred = 0;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001371 unsigned char op = SCpnt->cmnd[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001373 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1374 scsi_set_resid(SCpnt, 0);
FUJITA Tomonori6a32a8a2010-07-21 10:29:37 +09001375
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 if (result) {
1377 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1378 if (sense_valid)
1379 sense_deferred = scsi_sense_is_deferred(&sshdr);
1380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381#ifdef CONFIG_SCSI_LOGGING
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001382 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 if (sense_valid) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001384 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001385 "sd_done: sb[respc,sk,asc,"
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001386 "ascq]=%x,%x,%x,%x\n",
1387 sshdr.response_code,
1388 sshdr.sense_key, sshdr.asc,
1389 sshdr.ascq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 }
1391#endif
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001392 if (driver_byte(result) != DRIVER_SENSE &&
1393 (!sense_valid || sense_deferred))
1394 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001396 switch (sshdr.sense_key) {
1397 case HARDWARE_ERROR:
1398 case MEDIUM_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001399 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001400 break;
1401 case RECOVERED_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001402 good_bytes = scsi_bufflen(SCpnt);
1403 break;
Jamie Wellnitz10dab222008-09-11 21:39:36 -04001404 case NO_SENSE:
1405 /* This indicates a false check condition, so ignore it. An
1406 * unknown amount of data was transferred so treat it as an
1407 * error.
1408 */
1409 scsi_print_sense("sd", SCpnt);
1410 SCpnt->result = 0;
1411 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1412 break;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001413 case ABORTED_COMMAND:
1414 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001415 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001416 break;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001417 case ILLEGAL_REQUEST:
1418 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1419 good_bytes = sd_completed_bytes(SCpnt);
1420 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1421 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1422 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1423 sd_config_discard(sdkp, SD_LBP_DISABLE);
1424 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001425 default:
1426 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001428 out:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001429 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1430 sd_dif_complete(SCpnt, good_bytes);
1431
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001432 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
Martin K. Petersen77c9cfc2010-01-20 02:20:43 -05001433 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1434
1435 /* We have to print a failed command here as the
1436 * extended CDB gets freed before scsi_io_completion()
1437 * is called.
1438 */
1439 if (result)
1440 scsi_print_command(SCpnt);
1441
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001442 mempool_free(SCpnt->cmnd, sd_cdb_pool);
Martin K. Petersen77c9cfc2010-01-20 02:20:43 -05001443 SCpnt->cmnd = NULL;
1444 SCpnt->cmd_len = 0;
1445 }
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001446
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001447 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448}
1449
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450/*
1451 * spinup disk - called only in sd_revalidate_disk()
1452 */
1453static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001454sd_spinup_disk(struct scsi_disk *sdkp)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001455{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -04001457 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 int retries, spintime;
1459 unsigned int the_result;
1460 struct scsi_sense_hdr sshdr;
1461 int sense_valid = 0;
1462
1463 spintime = 0;
1464
1465 /* Spin up drives, as required. Only do this at boot time */
1466 /* Spinup needs to be done for module loads too. */
1467 do {
1468 retries = 0;
1469
1470 do {
1471 cmd[0] = TEST_UNIT_READY;
1472 memset((void *) &cmd[1], 0, 9);
1473
James Bottomleyea73a9f2005-08-28 11:33:52 -05001474 the_result = scsi_execute_req(sdkp->device, cmd,
1475 DMA_NONE, NULL, 0,
1476 &sshdr, SD_TIMEOUT,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001477 SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478
Alan Sternb4d38e32006-10-11 16:48:28 -04001479 /*
1480 * If the drive has indicated to us that it
1481 * doesn't have any media in it, don't bother
1482 * with any more polling.
1483 */
1484 if (media_not_present(sdkp, &sshdr))
1485 return;
1486
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001488 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 retries++;
1490 } while (retries < 3 &&
1491 (!scsi_status_is_good(the_result) ||
1492 ((driver_byte(the_result) & DRIVER_SENSE) &&
1493 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1494
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1496 /* no sense, TUR either succeeded or failed
1497 * with a status error */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001498 if(!spintime && !scsi_status_is_good(the_result)) {
1499 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1500 sd_print_result(sdkp, the_result);
1501 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 break;
1503 }
1504
1505 /*
1506 * The device does not want the automatic start to be issued.
1507 */
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001508 if (sdkp->device->no_start_on_add)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001511 if (sense_valid && sshdr.sense_key == NOT_READY) {
1512 if (sshdr.asc == 4 && sshdr.ascq == 3)
1513 break; /* manual intervention required */
1514 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1515 break; /* standby */
1516 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1517 break; /* unavailable */
1518 /*
1519 * Issue command to spin up drive when not ready
1520 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 if (!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001522 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 cmd[0] = START_STOP;
1524 cmd[1] = 1; /* Return immediately */
1525 memset((void *) &cmd[2], 0, 8);
1526 cmd[4] = 1; /* Start spin cycle */
Stefan Richterd2886ea2008-05-11 00:34:07 +02001527 if (sdkp->device->start_stop_pwr_cond)
1528 cmd[4] |= 1 << 4;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001529 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1530 NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001531 SD_TIMEOUT, SD_MAX_RETRIES,
1532 NULL);
Alan Stern4451e472005-07-12 10:45:17 -04001533 spintime_expire = jiffies + 100 * HZ;
1534 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 /* Wait 1 second for next try */
1537 msleep(1000);
1538 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001539
1540 /*
1541 * Wait for USB flash devices with slow firmware.
1542 * Yes, this sense key/ASC combination shouldn't
1543 * occur here. It's characteristic of these devices.
1544 */
1545 } else if (sense_valid &&
1546 sshdr.sense_key == UNIT_ATTENTION &&
1547 sshdr.asc == 0x28) {
1548 if (!spintime) {
1549 spintime_expire = jiffies + 5 * HZ;
1550 spintime = 1;
1551 }
1552 /* Wait 1 second for next try */
1553 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 } else {
1555 /* we don't understand the sense code, so it's
1556 * probably pointless to loop */
1557 if(!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001558 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1559 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 }
1561 break;
1562 }
1563
Alan Stern4451e472005-07-12 10:45:17 -04001564 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
1566 if (spintime) {
1567 if (scsi_status_is_good(the_result))
1568 printk("ready\n");
1569 else
1570 printk("not responding...\n");
1571 }
1572}
1573
Martin K. Petersene0597d72008-07-17 04:28:34 -04001574
1575/*
1576 * Determine whether disk supports Data Integrity Field.
1577 */
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07001578static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04001579{
1580 struct scsi_device *sdp = sdkp->device;
1581 u8 type;
1582
1583 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001584 return;
1585
1586 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1587
1588 if (type == sdkp->protection_type || !sdkp->first_scan)
1589 return;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001590
Martin K. Petersenbe922f42008-09-19 18:47:20 -04001591 sdkp->protection_type = type;
1592
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001593 if (type > SD_DIF_TYPE3_PROTECTION) {
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001594 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1595 "protection type %u. Disabling disk!\n", type);
1596 sdkp->capacity = 0;
1597 return;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001598 }
1599
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001600 if (scsi_host_dif_capable(sdp->host, type))
1601 sd_printk(KERN_NOTICE, sdkp,
1602 "Enabling DIF Type %u protection\n", type);
1603 else
1604 sd_printk(KERN_NOTICE, sdkp,
1605 "Disabling DIF Type %u protection\n", type);
Martin K. Petersene0597d72008-07-17 04:28:34 -04001606}
1607
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001608static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1609 struct scsi_sense_hdr *sshdr, int sense_valid,
1610 int the_result)
1611{
1612 sd_print_result(sdkp, the_result);
1613 if (driver_byte(the_result) & DRIVER_SENSE)
1614 sd_print_sense_hdr(sdkp, sshdr);
1615 else
1616 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1617
1618 /*
1619 * Set dirty bit for removable devices if not ready -
1620 * sometimes drives will not report this properly.
1621 */
1622 if (sdp->removable &&
1623 sense_valid && sshdr->sense_key == NOT_READY)
Tejun Heo2bae0092010-12-18 18:42:23 +01001624 set_media_not_present(sdkp);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001625
1626 /*
1627 * We used to set media_present to 0 here to indicate no media
1628 * in the drive, but some drives fail read capacity even with
1629 * media present, so we can't do that.
1630 */
1631 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1632}
1633
1634#define RC16_LEN 32
1635#if RC16_LEN > SD_BUF_SIZE
1636#error RC16_LEN must not be more than SD_BUF_SIZE
1637#endif
1638
James Bottomley3233ac12010-04-01 10:30:01 -04001639#define READ_CAPACITY_RETRIES_ON_RESET 10
1640
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001641static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1642 unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001643{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645 struct scsi_sense_hdr sshdr;
1646 int sense_valid = 0;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001647 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04001648 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001649 unsigned int alignment;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001650 unsigned long long lba;
1651 unsigned sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652
Hans de Goede5ce524b2010-10-01 14:20:10 -07001653 if (sdp->no_read_capacity_16)
1654 return -EINVAL;
1655
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 do {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001657 memset(cmd, 0, 16);
1658 cmd[0] = SERVICE_ACTION_IN;
1659 cmd[1] = SAI_READ_CAPACITY_16;
1660 cmd[13] = RC16_LEN;
1661 memset(buffer, 0, RC16_LEN);
1662
James Bottomleyea73a9f2005-08-28 11:33:52 -05001663 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001664 buffer, RC16_LEN, &sshdr,
1665 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666
James Bottomleyea73a9f2005-08-28 11:33:52 -05001667 if (media_not_present(sdkp, &sshdr))
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001668 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669
Matthew Wilcox2b301302009-03-12 14:20:30 -04001670 if (the_result) {
James Bottomleyea73a9f2005-08-28 11:33:52 -05001671 sense_valid = scsi_sense_valid(&sshdr);
Matthew Wilcox2b301302009-03-12 14:20:30 -04001672 if (sense_valid &&
1673 sshdr.sense_key == ILLEGAL_REQUEST &&
1674 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1675 sshdr.ascq == 0x00)
1676 /* Invalid Command Operation Code or
1677 * Invalid Field in CDB, just retry
1678 * silently with RC10 */
1679 return -EINVAL;
James Bottomley3233ac12010-04-01 10:30:01 -04001680 if (sense_valid &&
1681 sshdr.sense_key == UNIT_ATTENTION &&
1682 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1683 /* Device reset might occur several times,
1684 * give it one more chance */
1685 if (--reset_retries > 0)
1686 continue;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001687 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 retries--;
1689
1690 } while (the_result && retries);
1691
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001692 if (the_result) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001693 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001694 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1695 return -EINVAL;
1696 }
Martin K. Petersene73aec82007-02-27 22:40:55 -05001697
Dave Hansen8f76d152009-04-21 16:43:27 -07001698 sector_size = get_unaligned_be32(&buffer[8]);
1699 lba = get_unaligned_be64(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001700
1701 sd_read_protection_type(sdkp, buffer);
1702
1703 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1704 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1705 "kernel compiled with support for large block "
1706 "devices.\n");
1707 sdkp->capacity = 0;
1708 return -EOVERFLOW;
1709 }
1710
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001711 /* Logical blocks per physical block exponent */
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001712 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001713
1714 /* Lowest aligned logical block */
1715 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1716 blk_queue_alignment_offset(sdp->request_queue, alignment);
1717 if (alignment && sdkp->first_scan)
1718 sd_printk(KERN_NOTICE, sdkp,
1719 "physical block alignment offset: %u\n", alignment);
1720
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001721 if (buffer[14] & 0x80) { /* LBPME */
1722 sdkp->lbpme = 1;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05001723
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001724 if (buffer[14] & 0x40) /* LBPRZ */
1725 sdkp->lbprz = 1;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05001726
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001727 sd_config_discard(sdkp, SD_LBP_WS16);
Martin K. Petersene339c1a2009-11-26 12:00:40 -05001728 }
1729
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001730 sdkp->capacity = lba + 1;
1731 return sector_size;
1732}
1733
1734static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1735 unsigned char *buffer)
1736{
1737 unsigned char cmd[16];
1738 struct scsi_sense_hdr sshdr;
1739 int sense_valid = 0;
1740 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04001741 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001742 sector_t lba;
1743 unsigned sector_size;
1744
1745 do {
1746 cmd[0] = READ_CAPACITY;
1747 memset(&cmd[1], 0, 9);
1748 memset(buffer, 0, 8);
1749
1750 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1751 buffer, 8, &sshdr,
1752 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1753
1754 if (media_not_present(sdkp, &sshdr))
1755 return -ENODEV;
1756
James Bottomley3233ac12010-04-01 10:30:01 -04001757 if (the_result) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001758 sense_valid = scsi_sense_valid(&sshdr);
James Bottomley3233ac12010-04-01 10:30:01 -04001759 if (sense_valid &&
1760 sshdr.sense_key == UNIT_ATTENTION &&
1761 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1762 /* Device reset might occur several times,
1763 * give it one more chance */
1764 if (--reset_retries > 0)
1765 continue;
1766 }
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001767 retries--;
1768
1769 } while (the_result && retries);
1770
1771 if (the_result) {
1772 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1773 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1774 return -EINVAL;
1775 }
1776
Dave Hansen8f76d152009-04-21 16:43:27 -07001777 sector_size = get_unaligned_be32(&buffer[4]);
1778 lba = get_unaligned_be32(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001779
Hans de Goede5ce524b2010-10-01 14:20:10 -07001780 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1781 /* Some buggy (usb cardreader) devices return an lba of
1782 0xffffffff when the want to report a size of 0 (with
1783 which they really mean no media is present) */
1784 sdkp->capacity = 0;
Linus Torvalds5cc10352010-10-22 20:30:48 -07001785 sdkp->physical_block_size = sector_size;
Hans de Goede5ce524b2010-10-01 14:20:10 -07001786 return sector_size;
1787 }
1788
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001789 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1790 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1791 "kernel compiled with support for large block "
1792 "devices.\n");
1793 sdkp->capacity = 0;
1794 return -EOVERFLOW;
1795 }
1796
1797 sdkp->capacity = lba + 1;
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001798 sdkp->physical_block_size = sector_size;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001799 return sector_size;
1800}
1801
Matthew Wilcox2b301302009-03-12 14:20:30 -04001802static int sd_try_rc16_first(struct scsi_device *sdp)
1803{
Hannes Reineckef87146b2010-03-29 09:29:24 +02001804 if (sdp->host->max_cmd_len < 16)
1805 return 0;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001806 if (sdp->scsi_level > SCSI_SPC_2)
1807 return 1;
1808 if (scsi_device_protection(sdp))
1809 return 1;
1810 return 0;
1811}
1812
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001813/*
1814 * read disk capacity
1815 */
1816static void
1817sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1818{
1819 int sector_size;
1820 struct scsi_device *sdp = sdkp->device;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001821 sector_t old_capacity = sdkp->capacity;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001822
Matthew Wilcox2b301302009-03-12 14:20:30 -04001823 if (sd_try_rc16_first(sdp)) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001824 sector_size = read_capacity_16(sdkp, sdp, buffer);
1825 if (sector_size == -EOVERFLOW)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 goto got_data;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001827 if (sector_size == -ENODEV)
1828 return;
1829 if (sector_size < 0)
1830 sector_size = read_capacity_10(sdkp, sdp, buffer);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001831 if (sector_size < 0)
1832 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 } else {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001834 sector_size = read_capacity_10(sdkp, sdp, buffer);
1835 if (sector_size == -EOVERFLOW)
1836 goto got_data;
1837 if (sector_size < 0)
1838 return;
1839 if ((sizeof(sdkp->capacity) > 4) &&
1840 (sdkp->capacity > 0xffffffffULL)) {
1841 int old_sector_size = sector_size;
1842 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1843 "Trying to use READ CAPACITY(16).\n");
1844 sector_size = read_capacity_16(sdkp, sdp, buffer);
1845 if (sector_size < 0) {
1846 sd_printk(KERN_NOTICE, sdkp,
1847 "Using 0xffffffff as device size\n");
1848 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1849 sector_size = old_sector_size;
1850 goto got_data;
1851 }
1852 }
1853 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854
Alan Stern5c211ca2009-02-18 10:54:44 -05001855 /* Some devices are known to return the total number of blocks,
1856 * not the highest block number. Some devices have versions
1857 * which do this and others which do not. Some devices we might
1858 * suspect of doing this but we don't know for certain.
1859 *
1860 * If we know the reported capacity is wrong, decrement it. If
1861 * we can only guess, then assume the number of blocks is even
1862 * (usually true but not always) and err on the side of lowering
1863 * the capacity.
1864 */
1865 if (sdp->fix_capacity ||
1866 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1867 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1868 "from its reported value: %llu\n",
1869 (unsigned long long) sdkp->capacity);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 --sdkp->capacity;
Oliver Neukum61bf54b2007-02-08 09:04:48 +01001871 }
1872
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873got_data:
1874 if (sector_size == 0) {
1875 sector_size = 512;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001876 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1877 "assuming 512.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 }
1879
1880 if (sector_size != 512 &&
1881 sector_size != 1024 &&
1882 sector_size != 2048 &&
1883 sector_size != 4096 &&
1884 sector_size != 256) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001885 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1886 sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 /*
1888 * The user might want to re-format the drive with
1889 * a supported sectorsize. Once this happens, it
1890 * would be relatively trivial to set the thing up.
1891 * For this reason, we leave the thing in the table.
1892 */
1893 sdkp->capacity = 0;
1894 /*
1895 * set a bogus sector size so the normal read/write
1896 * logic in the block layer will eventually refuse any
1897 * request on this device without tripping over power
1898 * of two sector size assumptions
1899 */
1900 sector_size = 512;
1901 }
Martin K. Petersene1defc42009-05-22 17:17:49 -04001902 blk_queue_logical_block_size(sdp->request_queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903
James Bottomley7404ad3b2008-08-31 10:41:52 -05001904 {
1905 char cap_str_2[10], cap_str_10[10];
H. Peter Anvin520a2c22008-10-14 11:34:20 -07001906 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
James Bottomley7404ad3b2008-08-31 10:41:52 -05001907
1908 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1909 sizeof(cap_str_2));
1910 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1911 sizeof(cap_str_10));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001913 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001914 sd_printk(KERN_NOTICE, sdkp,
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001915 "%llu %d-byte logical blocks: (%s/%s)\n",
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001916 (unsigned long long)sdkp->capacity,
1917 sector_size, cap_str_10, cap_str_2);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001918
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001919 if (sdkp->physical_block_size != sector_size)
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001920 sd_printk(KERN_NOTICE, sdkp,
1921 "%u-byte physical blocks\n",
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001922 sdkp->physical_block_size);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001923 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 }
1925
1926 /* Rescale capacity to 512-byte units */
1927 if (sector_size == 4096)
1928 sdkp->capacity <<= 3;
1929 else if (sector_size == 2048)
1930 sdkp->capacity <<= 2;
1931 else if (sector_size == 1024)
1932 sdkp->capacity <<= 1;
1933 else if (sector_size == 256)
1934 sdkp->capacity >>= 1;
1935
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001936 blk_queue_physical_block_size(sdp->request_queue,
1937 sdkp->physical_block_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 sdkp->device->sector_size = sector_size;
1939}
1940
1941/* called with buffer of length 512 */
1942static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05001943sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1944 unsigned char *buffer, int len, struct scsi_mode_data *data,
1945 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946{
James Bottomleyea73a9f2005-08-28 11:33:52 -05001947 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05001948 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001949 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950}
1951
1952/*
1953 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001954 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955 */
1956static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001957sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001958{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001960 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 struct scsi_mode_data data;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001962 int old_wp = sdkp->write_prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963
1964 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001965 if (sdp->skip_ms_page_3f) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001966 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 return;
1968 }
1969
James Bottomleyea73a9f2005-08-28 11:33:52 -05001970 if (sdp->use_192_bytes_for_3f) {
1971 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 } else {
1973 /*
1974 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1975 * We have to start carefully: some devices hang if we ask
1976 * for more than is available.
1977 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001978 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
1980 /*
1981 * Second attempt: ask for page 0 When only page 0 is
1982 * implemented, a request for page 3F may return Sense Key
1983 * 5: Illegal Request, Sense Code 24: Invalid field in
1984 * CDB.
1985 */
1986 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001987 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988
1989 /*
1990 * Third attempt: ask 255 bytes, as we did earlier.
1991 */
1992 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001993 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1994 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 }
1996
1997 if (!scsi_status_is_good(res)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001998 sd_printk(KERN_WARNING, sdkp,
1999 "Test WP failed, assume Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 } else {
2001 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2002 set_disk_ro(sdkp->disk, sdkp->write_prot);
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002003 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2004 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2005 sdkp->write_prot ? "on" : "off");
2006 sd_printk(KERN_DEBUG, sdkp,
2007 "Mode Sense: %02x %02x %02x %02x\n",
2008 buffer[0], buffer[1], buffer[2], buffer[3]);
2009 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 }
2011}
2012
2013/*
2014 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06002015 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 */
2017static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05002018sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01002019{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05002021 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022
Al Viro 631e8a12005-05-16 01:59:55 +01002023 int dbd;
2024 int modepage;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002025 int first_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 struct scsi_mode_data data;
2027 struct scsi_sense_hdr sshdr;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002028 int old_wce = sdkp->WCE;
2029 int old_rcd = sdkp->RCD;
2030 int old_dpofua = sdkp->DPOFUA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002032 first_len = 4;
2033 if (sdp->skip_ms_page_8) {
2034 if (sdp->type == TYPE_RBC)
2035 goto defaults;
2036 else {
2037 if (sdp->skip_ms_page_3f)
2038 goto defaults;
2039 modepage = 0x3F;
2040 if (sdp->use_192_bytes_for_3f)
2041 first_len = 192;
2042 dbd = 0;
2043 }
2044 } else if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01002045 modepage = 6;
2046 dbd = 8;
2047 } else {
2048 modepage = 8;
2049 dbd = 0;
2050 }
2051
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 /* cautiously ask */
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002053 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2054 &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002055
2056 if (!scsi_status_is_good(res))
2057 goto bad_sense;
2058
Al Viro6d73c852006-02-23 02:03:16 +01002059 if (!data.header_length) {
2060 modepage = 6;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002061 first_len = 0;
Martin K. Petersene73aec82007-02-27 22:40:55 -05002062 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
Al Viro6d73c852006-02-23 02:03:16 +01002063 }
2064
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065 /* that went OK, now ask for the proper length */
2066 len = data.length;
2067
2068 /*
2069 * We're only interested in the first three bytes, actually.
2070 * But the data cache page is defined for the first 20.
2071 */
2072 if (len < 3)
2073 goto bad_sense;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002074 else if (len > SD_BUF_SIZE) {
2075 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2076 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2077 len = SD_BUF_SIZE;
2078 }
2079 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2080 len = 192;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081
2082 /* Get the data */
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002083 if (len > first_len)
2084 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2085 &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086
2087 if (scsi_status_is_good(res)) {
Al Viro 631e8a12005-05-16 01:59:55 +01002088 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002090 while (offset < len) {
2091 u8 page_code = buffer[offset] & 0x3F;
2092 u8 spf = buffer[offset] & 0x40;
2093
2094 if (page_code == 8 || page_code == 6) {
2095 /* We're interested only in the first 3 bytes.
2096 */
2097 if (len - offset <= 2) {
2098 sd_printk(KERN_ERR, sdkp, "Incomplete "
2099 "mode parameter data\n");
2100 goto defaults;
2101 } else {
2102 modepage = page_code;
2103 goto Page_found;
2104 }
2105 } else {
2106 /* Go to the next page */
2107 if (spf && len - offset > 3)
2108 offset += 4 + (buffer[offset+2] << 8) +
2109 buffer[offset+3];
2110 else if (!spf && len - offset > 1)
2111 offset += 2 + buffer[offset+1];
2112 else {
2113 sd_printk(KERN_ERR, sdkp, "Incomplete "
2114 "mode parameter data\n");
2115 goto defaults;
2116 }
2117 }
Al Viro48970802006-02-26 08:34:10 -06002118 }
2119
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002120 if (modepage == 0x3F) {
2121 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2122 "present\n");
2123 goto defaults;
2124 } else if ((buffer[offset] & 0x3f) != modepage) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002125 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
Al Viro 631e8a12005-05-16 01:59:55 +01002126 goto defaults;
2127 }
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002128 Page_found:
Al Viro 631e8a12005-05-16 01:59:55 +01002129 if (modepage == 8) {
2130 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2131 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2132 } else {
2133 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2134 sdkp->RCD = 0;
2135 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136
Tejun Heo007365a2006-01-06 09:53:52 +01002137 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2138 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002139 sd_printk(KERN_NOTICE, sdkp,
2140 "Uses READ/WRITE(6), disabling FUA\n");
Tejun Heo007365a2006-01-06 09:53:52 +01002141 sdkp->DPOFUA = 0;
2142 }
2143
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002144 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2145 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2146 sd_printk(KERN_NOTICE, sdkp,
2147 "Write cache: %s, read cache: %s, %s\n",
2148 sdkp->WCE ? "enabled" : "disabled",
2149 sdkp->RCD ? "disabled" : "enabled",
2150 sdkp->DPOFUA ? "supports DPO and FUA"
2151 : "doesn't support DPO or FUA");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152
2153 return;
2154 }
2155
2156bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05002157 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158 sshdr.sense_key == ILLEGAL_REQUEST &&
2159 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
Martin K. Petersene73aec82007-02-27 22:40:55 -05002160 /* Invalid field in CDB */
2161 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05002163 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164
2165defaults:
Martin K. Petersene73aec82007-02-27 22:40:55 -05002166 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 sdkp->WCE = 0;
2168 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06002169 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170}
2171
Martin K. Petersene0597d72008-07-17 04:28:34 -04002172/*
2173 * The ATO bit indicates whether the DIF application tag is available
2174 * for use by the operating system.
2175 */
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07002176static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04002177{
2178 int res, offset;
2179 struct scsi_device *sdp = sdkp->device;
2180 struct scsi_mode_data data;
2181 struct scsi_sense_hdr sshdr;
2182
2183 if (sdp->type != TYPE_DISK)
2184 return;
2185
2186 if (sdkp->protection_type == 0)
2187 return;
2188
2189 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2190 SD_MAX_RETRIES, &data, &sshdr);
2191
2192 if (!scsi_status_is_good(res) || !data.header_length ||
2193 data.length < 6) {
2194 sd_printk(KERN_WARNING, sdkp,
2195 "getting Control mode page failed, assume no ATO\n");
2196
2197 if (scsi_sense_valid(&sshdr))
2198 sd_print_sense_hdr(sdkp, &sshdr);
2199
2200 return;
2201 }
2202
2203 offset = data.header_length + data.block_descriptor_length;
2204
2205 if ((buffer[offset] & 0x3f) != 0x0a) {
2206 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2207 return;
2208 }
2209
2210 if ((buffer[offset + 5] & 0x80) == 0)
2211 return;
2212
2213 sdkp->ATO = 1;
2214
2215 return;
2216}
2217
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218/**
Martin K. Petersend11b6912009-05-23 11:43:39 -04002219 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2220 * @disk: disk to query
2221 */
2222static void sd_read_block_limits(struct scsi_disk *sdkp)
2223{
2224 unsigned int sector_sz = sdkp->device->sector_size;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002225 const int vpd_len = 64;
James Bottomleye3deec02009-11-03 12:33:07 -06002226 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersend11b6912009-05-23 11:43:39 -04002227
James Bottomleye3deec02009-11-03 12:33:07 -06002228 if (!buffer ||
2229 /* Block Limits VPD */
2230 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2231 goto out;
Martin K. Petersend11b6912009-05-23 11:43:39 -04002232
2233 blk_queue_io_min(sdkp->disk->queue,
2234 get_unaligned_be16(&buffer[6]) * sector_sz);
2235 blk_queue_io_opt(sdkp->disk->queue,
2236 get_unaligned_be32(&buffer[12]) * sector_sz);
2237
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002238 if (buffer[3] == 0x3c) {
2239 unsigned int lba_count, desc_count;
2240
2241 sdkp->max_ws_blocks =
2242 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2243 (u64)0xffffffff);
2244
2245 if (!sdkp->lbpme)
2246 goto out;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002247
2248 lba_count = get_unaligned_be32(&buffer[20]);
2249 desc_count = get_unaligned_be32(&buffer[24]);
2250
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002251 if (lba_count && desc_count)
2252 sdkp->max_unmap_blocks = lba_count;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002253
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002254 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002255
2256 if (buffer[32] & 0x80)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002257 sdkp->unmap_alignment =
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002258 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002259
2260 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2261
2262 if (sdkp->max_unmap_blocks)
2263 sd_config_discard(sdkp, SD_LBP_UNMAP);
2264 else
2265 sd_config_discard(sdkp, SD_LBP_WS16);
2266
2267 } else { /* LBP VPD page tells us what to use */
2268
2269 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2270 sd_config_discard(sdkp, SD_LBP_UNMAP);
2271 else if (sdkp->lbpws)
2272 sd_config_discard(sdkp, SD_LBP_WS16);
2273 else if (sdkp->lbpws10)
2274 sd_config_discard(sdkp, SD_LBP_WS10);
2275 else
2276 sd_config_discard(sdkp, SD_LBP_DISABLE);
2277 }
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002278 }
2279
James Bottomleye3deec02009-11-03 12:33:07 -06002280 out:
Martin K. Petersend11b6912009-05-23 11:43:39 -04002281 kfree(buffer);
2282}
2283
2284/**
Martin K. Petersen3821d762009-05-23 11:43:38 -04002285 * sd_read_block_characteristics - Query block dev. characteristics
2286 * @disk: disk to query
2287 */
2288static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2289{
James Bottomleye3deec02009-11-03 12:33:07 -06002290 unsigned char *buffer;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002291 u16 rot;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002292 const int vpd_len = 64;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002293
James Bottomleye3deec02009-11-03 12:33:07 -06002294 buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersen3821d762009-05-23 11:43:38 -04002295
James Bottomleye3deec02009-11-03 12:33:07 -06002296 if (!buffer ||
2297 /* Block Device Characteristics VPD */
2298 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2299 goto out;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002300
2301 rot = get_unaligned_be16(&buffer[4]);
2302
2303 if (rot == 1)
2304 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2305
James Bottomleye3deec02009-11-03 12:33:07 -06002306 out:
Martin K. Petersen3821d762009-05-23 11:43:38 -04002307 kfree(buffer);
2308}
2309
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002310/**
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002311 * sd_read_block_provisioning - Query provisioning VPD page
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002312 * @disk: disk to query
2313 */
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002314static void sd_read_block_provisioning(struct scsi_disk *sdkp)
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002315{
2316 unsigned char *buffer;
2317 const int vpd_len = 8;
2318
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002319 if (sdkp->lbpme == 0)
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002320 return;
2321
2322 buffer = kmalloc(vpd_len, GFP_KERNEL);
2323
2324 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2325 goto out;
2326
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002327 sdkp->lbpvpd = 1;
2328 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2329 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2330 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002331
2332 out:
2333 kfree(buffer);
2334}
2335
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002336static int sd_try_extended_inquiry(struct scsi_device *sdp)
2337{
2338 /*
2339 * Although VPD inquiries can go to SCSI-2 type devices,
2340 * some USB ones crash on receiving them, and the pages
2341 * we currently ask for are for SPC-3 and beyond
2342 */
2343 if (sdp->scsi_level > SCSI_SPC_2)
2344 return 1;
2345 return 0;
2346}
2347
Martin K. Petersen3821d762009-05-23 11:43:38 -04002348/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349 * sd_revalidate_disk - called the first time a new disk is seen,
2350 * performs disk spin up, read_capacity, etc.
2351 * @disk: struct gendisk we care about
2352 **/
2353static int sd_revalidate_disk(struct gendisk *disk)
2354{
2355 struct scsi_disk *sdkp = scsi_disk(disk);
2356 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 unsigned char *buffer;
Tejun Heo4913efe2010-09-03 11:56:16 +02002358 unsigned flush = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05002360 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2361 "sd_revalidate_disk\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362
2363 /*
2364 * If the device is offline, don't try and read capacity or any
2365 * of the other niceties.
2366 */
2367 if (!scsi_device_online(sdp))
2368 goto out;
2369
Bernhard Wallea6123f12007-05-21 17:15:26 +02002370 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 if (!buffer) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002372 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2373 "allocation failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05002374 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002375 }
2376
Martin K. Petersene73aec82007-02-27 22:40:55 -05002377 sd_spinup_disk(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378
2379 /*
2380 * Without media there is no reason to ask; moreover, some devices
2381 * react badly if we do.
2382 */
2383 if (sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002384 sd_read_capacity(sdkp, buffer);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002385
2386 if (sd_try_extended_inquiry(sdp)) {
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002387 sd_read_block_provisioning(sdkp);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002388 sd_read_block_limits(sdkp);
2389 sd_read_block_characteristics(sdkp);
2390 }
2391
Martin K. Petersene73aec82007-02-27 22:40:55 -05002392 sd_read_write_protect_flag(sdkp, buffer);
2393 sd_read_cache_type(sdkp, buffer);
Martin K. Petersene0597d72008-07-17 04:28:34 -04002394 sd_read_app_tag_own(sdkp, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395 }
Tejun Heo461d4e92006-01-06 09:52:55 +01002396
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002397 sdkp->first_scan = 0;
2398
Tejun Heo461d4e92006-01-06 09:52:55 +01002399 /*
2400 * We now have all cache related info, determine how we deal
Tejun Heo4913efe2010-09-03 11:56:16 +02002401 * with flush requests.
Tejun Heo461d4e92006-01-06 09:52:55 +01002402 */
Tejun Heo4913efe2010-09-03 11:56:16 +02002403 if (sdkp->WCE) {
2404 flush |= REQ_FLUSH;
2405 if (sdkp->DPOFUA)
2406 flush |= REQ_FUA;
2407 }
Tejun Heo461d4e92006-01-06 09:52:55 +01002408
Tejun Heo4913efe2010-09-03 11:56:16 +02002409 blk_queue_flush(sdkp->disk->queue, flush);
Tejun Heo461d4e92006-01-06 09:52:55 +01002410
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411 set_capacity(disk, sdkp->capacity);
2412 kfree(buffer);
2413
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414 out:
2415 return 0;
2416}
2417
2418/**
Tejun Heo72ec24b2010-05-15 20:09:32 +02002419 * sd_unlock_native_capacity - unlock native capacity
2420 * @disk: struct gendisk to set capacity for
2421 *
2422 * Block layer calls this function if it detects that partitions
2423 * on @disk reach beyond the end of the device. If the SCSI host
2424 * implements ->unlock_native_capacity() method, it's invoked to
2425 * give it a chance to adjust the device capacity.
2426 *
2427 * CONTEXT:
2428 * Defined by block layer. Might sleep.
2429 */
2430static void sd_unlock_native_capacity(struct gendisk *disk)
2431{
2432 struct scsi_device *sdev = scsi_disk(disk)->device;
2433
2434 if (sdev->host->hostt->unlock_native_capacity)
2435 sdev->host->hostt->unlock_native_capacity(sdev);
2436}
2437
2438/**
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002439 * sd_format_disk_name - format disk name
2440 * @prefix: name prefix - ie. "sd" for SCSI disks
2441 * @index: index of the disk to format name for
2442 * @buf: output buffer
2443 * @buflen: length of the output buffer
2444 *
2445 * SCSI disk names starts at sda. The 26th device is sdz and the
2446 * 27th is sdaa. The last one for two lettered suffix is sdzz
2447 * which is followed by sdaaa.
2448 *
2449 * This is basically 26 base counting with one extra 'nil' entry
Daniel Mack3ad2f3f2010-02-03 08:01:28 +08002450 * at the beginning from the second digit on and can be
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002451 * determined using similar method as 26 base conversion with the
2452 * index shifted -1 after each digit is computed.
2453 *
2454 * CONTEXT:
2455 * Don't care.
2456 *
2457 * RETURNS:
2458 * 0 on success, -errno on failure.
2459 */
2460static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2461{
2462 const int base = 'z' - 'a' + 1;
2463 char *begin = buf + strlen(prefix);
2464 char *end = buf + buflen;
2465 char *p;
2466 int unit;
2467
2468 p = end - 1;
2469 *p = '\0';
2470 unit = base;
2471 do {
2472 if (p == begin)
2473 return -EINVAL;
2474 *--p = 'a' + (index % unit);
2475 index = (index / unit) - 1;
2476 } while (index >= 0);
2477
2478 memmove(begin, p, end - p);
2479 memcpy(buf, prefix, strlen(prefix));
2480
2481 return 0;
2482}
2483
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002484/*
2485 * The asynchronous part of sd_probe
2486 */
2487static void sd_probe_async(void *data, async_cookie_t cookie)
2488{
2489 struct scsi_disk *sdkp = data;
2490 struct scsi_device *sdp;
2491 struct gendisk *gd;
2492 u32 index;
2493 struct device *dev;
2494
2495 sdp = sdkp->device;
2496 gd = sdkp->disk;
2497 index = sdkp->index;
2498 dev = &sdp->sdev_gendev;
2499
Michael Reed1a03ae02010-09-20 11:20:22 -05002500 gd->major = sd_major((index & 0xf0) >> 4);
2501 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2502 gd->minors = SD_MINORS;
2503
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002504 gd->fops = &sd_fops;
2505 gd->private_data = &sdkp->driver;
2506 gd->queue = sdkp->device->request_queue;
2507
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002508 /* defaults, until the device tells us otherwise */
2509 sdp->sector_size = 512;
2510 sdkp->capacity = 0;
2511 sdkp->media_present = 1;
2512 sdkp->write_prot = 0;
2513 sdkp->WCE = 0;
2514 sdkp->RCD = 0;
2515 sdkp->ATO = 0;
2516 sdkp->first_scan = 1;
2517
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002518 sd_revalidate_disk(gd);
2519
2520 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
FUJITA Tomonorif1126e92010-07-01 19:49:18 +09002521 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002522
2523 gd->driverfs_dev = &sdp->sdev_gendev;
NeilBrown97fedbb2010-03-16 08:55:32 +01002524 gd->flags = GENHD_FL_EXT_DEVT;
Tejun Heo2bae0092010-12-18 18:42:23 +01002525 if (sdp->removable) {
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002526 gd->flags |= GENHD_FL_REMOVABLE;
Tejun Heo2bae0092010-12-18 18:42:23 +01002527 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2528 }
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002529
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002530 add_disk(gd);
2531 sd_dif_config_host(sdkp);
2532
Martin K. Petersen3821d762009-05-23 11:43:38 -04002533 sd_revalidate_disk(gd);
2534
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002535 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2536 sdp->removable ? "removable " : "");
Alan Stern478a8a02010-06-16 14:52:17 -04002537 scsi_autopm_put_device(sdp);
James Bottomleyea038f62009-08-21 09:47:54 -06002538 put_device(&sdkp->dev);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002539}
2540
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002541/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542 * sd_probe - called during driver initialization and whenever a
2543 * new scsi device is attached to the system. It is called once
2544 * for each scsi device (not just disks) present.
2545 * @dev: pointer to device object
2546 *
2547 * Returns 0 if successful (or not interested in this scsi device
2548 * (e.g. scanner)); 1 when there is an error.
2549 *
2550 * Note: this function is invoked from the scsi mid-level.
2551 * This function sets up the mapping between a given
2552 * <host,channel,id,lun> (found in sdp) and new device name
2553 * (e.g. /dev/sda). More precisely it is the block device major
2554 * and minor number that is chosen here.
2555 *
2556 * Assume sd_attach is not re-entrant (for time being)
2557 * Also think about sd_attach() and sd_remove() running coincidentally.
2558 **/
2559static int sd_probe(struct device *dev)
2560{
2561 struct scsi_device *sdp = to_scsi_device(dev);
2562 struct scsi_disk *sdkp;
2563 struct gendisk *gd;
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07002564 int index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002565 int error;
2566
2567 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01002568 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 goto out;
2570
James Bottomley9ccfc752005-10-02 11:45:08 -05002571 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2572 "sd_attach\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573
2574 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05002575 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002576 if (!sdkp)
2577 goto out;
2578
Tejun Heo689d6fa2008-08-25 19:56:16 +09002579 gd = alloc_disk(SD_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002580 if (!gd)
2581 goto out_free;
2582
Tejun Heof27bac22008-07-14 14:59:30 +09002583 do {
2584 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2585 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586
Tejun Heo4034cc62009-02-21 11:04:45 +09002587 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002588 error = ida_get_new(&sd_index_ida, &index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002589 spin_unlock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002590 } while (error == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591
Linus Torvalds1da177e2005-04-16 15:20:36 -07002592 if (error)
2593 goto out_put;
2594
Michael Reed1a03ae02010-09-20 11:20:22 -05002595 if (index >= SD_MAX_DISKS) {
2596 error = -ENODEV;
2597 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n");
2598 goto out_free_index;
2599 }
2600
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002601 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2602 if (error)
Tejun Heof27bac22008-07-14 14:59:30 +09002603 goto out_free_index;
2604
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 sdkp->device = sdp;
2606 sdkp->driver = &sd_template;
2607 sdkp->disk = gd;
2608 sdkp->index = index;
Arnd Bergmann409f3492010-07-07 16:51:29 +02002609 atomic_set(&sdkp->openers, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002610
James Bottomley601e7632009-05-26 20:35:48 +00002611 if (!sdp->request_queue->rq_timeout) {
2612 if (sdp->type != TYPE_MOD)
2613 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2614 else
2615 blk_queue_rq_timeout(sdp->request_queue,
2616 SD_MOD_TIMEOUT);
2617 }
2618
2619 device_initialize(&sdkp->dev);
Alan Stern478a8a02010-06-16 14:52:17 -04002620 sdkp->dev.parent = dev;
James Bottomley601e7632009-05-26 20:35:48 +00002621 sdkp->dev.class = &sd_disk_class;
Alan Stern478a8a02010-06-16 14:52:17 -04002622 dev_set_name(&sdkp->dev, dev_name(dev));
James Bottomley601e7632009-05-26 20:35:48 +00002623
2624 if (device_add(&sdkp->dev))
2625 goto out_free_index;
2626
Alan Stern478a8a02010-06-16 14:52:17 -04002627 get_device(dev);
2628 dev_set_drvdata(dev, sdkp);
James Bottomley601e7632009-05-26 20:35:48 +00002629
James Bottomleyea038f62009-08-21 09:47:54 -06002630 get_device(&sdkp->dev); /* prevent release before async_schedule */
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002631 async_schedule(sd_probe_async, sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632
2633 return 0;
2634
Tejun Heof27bac22008-07-14 14:59:30 +09002635 out_free_index:
Tejun Heo4034cc62009-02-21 11:04:45 +09002636 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002637 ida_remove(&sd_index_ida, index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002638 spin_unlock(&sd_index_lock);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002639 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002641 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002643 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644 return error;
2645}
2646
2647/**
2648 * sd_remove - called whenever a scsi disk (previously recognized by
2649 * sd_probe) is detached from the system. It is called (potentially
2650 * multiple times) during sd module unload.
2651 * @sdp: pointer to mid level scsi device object
2652 *
2653 * Note: this function is invoked from the scsi mid-level.
2654 * This function potentially frees up a device name (e.g. /dev/sdc)
2655 * that could be re-used by a subsequent sd_probe().
2656 * This function is not called when the built-in sd driver is "exit-ed".
2657 **/
2658static int sd_remove(struct device *dev)
2659{
James Bottomley601e7632009-05-26 20:35:48 +00002660 struct scsi_disk *sdkp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661
James Bottomley601e7632009-05-26 20:35:48 +00002662 sdkp = dev_get_drvdata(dev);
Alan Stern478a8a02010-06-16 14:52:17 -04002663 scsi_autopm_get_device(sdkp->device);
2664
2665 async_synchronize_full();
Hannes Reineckeb3912772009-06-18 09:57:18 +02002666 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
FUJITA Tomonori82b6d572010-07-03 08:07:04 -06002667 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01002668 device_del(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002669 del_gendisk(sdkp->disk);
2670 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002671
Arjan van de Ven0b950672006-01-11 13:16:10 +01002672 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002673 dev_set_drvdata(dev, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01002674 put_device(&sdkp->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01002675 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676
2677 return 0;
2678}
2679
2680/**
2681 * scsi_disk_release - Called to free the scsi_disk structure
Tony Jonesee959b02008-02-22 00:13:36 +01002682 * @dev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01002684 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685 * called on last put, you should always use the scsi_disk_get()
2686 * scsi_disk_put() helpers which manipulate the semaphore directly
Tony Jonesee959b02008-02-22 00:13:36 +01002687 * and never do a direct put_device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688 **/
Tony Jonesee959b02008-02-22 00:13:36 +01002689static void scsi_disk_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002690{
Tony Jonesee959b02008-02-22 00:13:36 +01002691 struct scsi_disk *sdkp = to_scsi_disk(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692 struct gendisk *disk = sdkp->disk;
2693
Tejun Heo4034cc62009-02-21 11:04:45 +09002694 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002695 ida_remove(&sd_index_ida, sdkp->index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002696 spin_unlock(&sd_index_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697
2698 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002700 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701
2702 kfree(sdkp);
2703}
2704
James Bottomleycc5d2c82007-03-20 12:26:03 -05002705static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
Tejun Heoc3c94c52007-03-21 00:13:59 +09002706{
2707 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2708 struct scsi_sense_hdr sshdr;
James Bottomleycc5d2c82007-03-20 12:26:03 -05002709 struct scsi_device *sdp = sdkp->device;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002710 int res;
2711
2712 if (start)
2713 cmd[4] |= 1; /* START */
2714
Stefan Richterd2886ea2008-05-11 00:34:07 +02002715 if (sdp->start_stop_pwr_cond)
2716 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2717
Tejun Heoc3c94c52007-03-21 00:13:59 +09002718 if (!scsi_device_online(sdp))
2719 return -ENODEV;
2720
2721 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09002722 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002723 if (res) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002724 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2725 sd_print_result(sdkp, res);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002726 if (driver_byte(res) & DRIVER_SENSE)
James Bottomleycc5d2c82007-03-20 12:26:03 -05002727 sd_print_sense_hdr(sdkp, &sshdr);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002728 }
2729
2730 return res;
2731}
2732
Linus Torvalds1da177e2005-04-16 15:20:36 -07002733/*
2734 * Send a SYNCHRONIZE CACHE instruction down to the device through
2735 * the normal SCSI command structure. Wait for the command to
2736 * complete.
2737 */
2738static void sd_shutdown(struct device *dev)
2739{
Alan Stern39b7f1e2005-11-04 14:44:41 -05002740 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741
2742 if (!sdkp)
2743 return; /* this can happen */
2744
Alan Stern39b7f1e2005-11-04 14:44:41 -05002745 if (sdkp->WCE) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002746 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2747 sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002748 }
Tejun Heoc3c94c52007-03-21 00:13:59 +09002749
James Bottomleycc5d2c82007-03-20 12:26:03 -05002750 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2751 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2752 sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002753 }
2754
Alan Stern39b7f1e2005-11-04 14:44:41 -05002755 scsi_disk_put(sdkp);
2756}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002757
Tejun Heoc3c94c52007-03-21 00:13:59 +09002758static int sd_suspend(struct device *dev, pm_message_t mesg)
2759{
Tejun Heoc3c94c52007-03-21 00:13:59 +09002760 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04002761 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002762
2763 if (!sdkp)
2764 return 0; /* this can happen */
2765
2766 if (sdkp->WCE) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002767 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
Tejun Heoc3c94c52007-03-21 00:13:59 +09002768 ret = sd_sync_cache(sdkp);
2769 if (ret)
Alan Stern09ff92f2007-05-21 09:55:04 -04002770 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002771 }
2772
Rafael J. Wysocki3a2d5b72008-02-23 19:13:25 +01002773 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002774 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2775 ret = sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002776 }
2777
Alan Stern09ff92f2007-05-21 09:55:04 -04002778done:
2779 scsi_disk_put(sdkp);
2780 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002781}
2782
2783static int sd_resume(struct device *dev)
2784{
Tejun Heoc3c94c52007-03-21 00:13:59 +09002785 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04002786 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002787
James Bottomleycc5d2c82007-03-20 12:26:03 -05002788 if (!sdkp->device->manage_start_stop)
Alan Stern09ff92f2007-05-21 09:55:04 -04002789 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002790
James Bottomleycc5d2c82007-03-20 12:26:03 -05002791 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
Alan Stern09ff92f2007-05-21 09:55:04 -04002792 ret = sd_start_stop_device(sdkp, 1);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002793
Alan Stern09ff92f2007-05-21 09:55:04 -04002794done:
2795 scsi_disk_put(sdkp);
2796 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002797}
2798
Linus Torvalds1da177e2005-04-16 15:20:36 -07002799/**
2800 * init_sd - entry point for this driver (both when built in or when
2801 * a module).
2802 *
2803 * Note: this function registers this driver with the scsi mid-level.
2804 **/
2805static int __init init_sd(void)
2806{
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002807 int majors = 0, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808
2809 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2810
2811 for (i = 0; i < SD_MAJORS; i++)
2812 if (register_blkdev(sd_major(i), "sd") == 0)
2813 majors++;
2814
2815 if (!majors)
2816 return -ENODEV;
2817
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002818 err = class_register(&sd_disk_class);
2819 if (err)
2820 goto err_out;
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002821
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002822 err = scsi_register_driver(&sd_template.gendrv);
2823 if (err)
2824 goto err_out_class;
2825
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002826 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2827 0, 0, NULL);
2828 if (!sd_cdb_cache) {
2829 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2830 goto err_out_class;
2831 }
2832
2833 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2834 if (!sd_cdb_pool) {
2835 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2836 goto err_out_cache;
2837 }
2838
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002839 return 0;
2840
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002841err_out_cache:
2842 kmem_cache_destroy(sd_cdb_cache);
2843
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002844err_out_class:
2845 class_unregister(&sd_disk_class);
2846err_out:
2847 for (i = 0; i < SD_MAJORS; i++)
2848 unregister_blkdev(sd_major(i), "sd");
2849 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002850}
2851
2852/**
2853 * exit_sd - exit point for this driver (when it is a module).
2854 *
2855 * Note: this function unregisters this driver from the scsi mid-level.
2856 **/
2857static void __exit exit_sd(void)
2858{
2859 int i;
2860
2861 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2862
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002863 mempool_destroy(sd_cdb_pool);
2864 kmem_cache_destroy(sd_cdb_cache);
2865
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866 scsi_unregister_driver(&sd_template.gendrv);
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002867 class_unregister(&sd_disk_class);
2868
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869 for (i = 0; i < SD_MAJORS; i++)
2870 unregister_blkdev(sd_major(i), "sd");
2871}
2872
Linus Torvalds1da177e2005-04-16 15:20:36 -07002873module_init(init_sd);
2874module_exit(exit_sd);
Martin K. Petersene73aec82007-02-27 22:40:55 -05002875
2876static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2877 struct scsi_sense_hdr *sshdr)
2878{
David Miller2e4c3322010-08-31 13:35:31 -07002879 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05002880 scsi_show_sense_hdr(sshdr);
David Miller2e4c3322010-08-31 13:35:31 -07002881 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05002882 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2883}
2884
2885static void sd_print_result(struct scsi_disk *sdkp, int result)
2886{
David Miller2e4c3322010-08-31 13:35:31 -07002887 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05002888 scsi_show_result(result);
2889}
2890