blob: e62d17d41d4e7b84ddf7469194aa0c63d541d59d [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>
Lin Ming54f575882011-12-05 09:20:26 +080053#include <linux/pm_runtime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <asm/uaccess.h>
Dave Hansen8f76d152009-04-21 16:43:27 -070055#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#include <scsi/scsi.h>
58#include <scsi/scsi_cmnd.h>
59#include <scsi/scsi_dbg.h>
60#include <scsi/scsi_device.h>
61#include <scsi/scsi_driver.h>
62#include <scsi/scsi_eh.h>
63#include <scsi/scsi_host.h>
64#include <scsi/scsi_ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <scsi/scsicam.h>
66
Martin K. Petersenaa916962008-06-17 12:47:32 -040067#include "sd.h"
Dan Williamsa7a20d12012-03-22 17:05:11 -070068#include "scsi_priv.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include "scsi_logging.h"
70
Rene Hermanf018fa52006-03-08 00:14:20 -080071MODULE_AUTHOR("Eric Youngdale");
72MODULE_DESCRIPTION("SCSI disk (sd) driver");
73MODULE_LICENSE("GPL");
74
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040091MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
Rene Hermanf018fa52006-03-08 00:14:20 -080094
Tejun Heo870d6652008-08-25 19:47:25 +090095#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
Tejun Heof615b482008-08-25 19:47:24 +090096#define SD_MINORS 16
Tejun Heo870d6652008-08-25 19:47:25 +090097#else
Tejun Heo3e1a7ff2008-08-25 19:56:17 +090098#define SD_MINORS 0
Tejun Heo870d6652008-08-25 19:47:25 +090099#endif
100
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500101static void sd_config_discard(struct scsi_disk *, unsigned int);
Martin K. Petersen5db44862012-09-18 12:19:32 -0400102static void sd_config_write_same(struct scsi_disk *);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800103static int sd_revalidate_disk(struct gendisk *);
Tejun Heo72ec24b2010-05-15 20:09:32 +0200104static void sd_unlock_native_capacity(struct gendisk *disk);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800105static int sd_probe(struct device *);
106static int sd_remove(struct device *);
107static void sd_shutdown(struct device *);
Aaron Lu691e3d32012-11-09 15:27:55 +0800108static int sd_suspend(struct device *);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800109static int sd_resume(struct device *);
110static void sd_rescan(struct device *);
111static int sd_done(struct scsi_cmnd *);
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500112static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800113static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
Tony Jonesee959b02008-02-22 00:13:36 +0100114static void scsi_disk_release(struct device *cdev);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800115static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116static void sd_print_result(struct scsi_disk *, int);
117
Tejun Heo4034cc62009-02-21 11:04:45 +0900118static DEFINE_SPINLOCK(sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +0900119static DEFINE_IDA(sd_index_ida);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121/* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100124static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700126static struct kmem_cache *sd_cdb_cache;
127static mempool_t *sd_cdb_pool;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400128
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600129static const char *sd_cache_types[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
132};
133
Tony Jonesee959b02008-02-22 00:13:36 +0100134static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700135cache_type_store(struct device *dev, struct device_attribute *attr,
136 const char *buf, size_t count)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600137{
138 int i, ct = -1, rcd, wce, sp;
Tony Jonesee959b02008-02-22 00:13:36 +0100139 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600140 struct scsi_device *sdp = sdkp->device;
141 char buffer[64];
142 char *buffer_data;
143 struct scsi_mode_data data;
144 struct scsi_sense_hdr sshdr;
Ben Hutchings2ee3e262013-05-27 19:07:19 +0100145 static const char temp[] = "temporary ";
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600146 int len;
147
148 if (sdp->type != TYPE_DISK)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
152 return -EINVAL;
153
James Bottomley39c60a02013-04-24 14:02:53 -0700154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
155 buf += sizeof(temp) - 1;
156 sdkp->cache_override = 1;
157 } else {
158 sdkp->cache_override = 0;
159 }
160
Tobias Klauser6391a112006-06-08 22:23:48 -0700161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700162 len = strlen(sd_cache_types[i]);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600163 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
164 buf[len] == '\n') {
165 ct = i;
166 break;
167 }
168 }
169 if (ct < 0)
170 return -EINVAL;
171 rcd = ct & 0x01 ? 1 : 0;
172 wce = ct & 0x02 ? 1 : 0;
James Bottomley39c60a02013-04-24 14:02:53 -0700173
174 if (sdkp->cache_override) {
175 sdkp->WCE = wce;
176 sdkp->RCD = rcd;
177 return count;
178 }
179
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
181 SD_MAX_RETRIES, &data, NULL))
182 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600184 data.block_descriptor_length);
185 buffer_data = buffer + data.header_length +
186 data.block_descriptor_length;
187 buffer_data[2] &= ~0x05;
188 buffer_data[2] |= wce << 2 | rcd;
189 sp = buffer_data[0] & 0x80 ? 1 : 0;
190
191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
192 SD_MAX_RETRIES, &data, &sshdr)) {
193 if (scsi_sense_valid(&sshdr))
Martin K. Petersene73aec82007-02-27 22:40:55 -0500194 sd_print_sense_hdr(sdkp, &sshdr);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600195 return -EINVAL;
196 }
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -0600197 revalidate_disk(sdkp->disk);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600198 return count;
199}
200
Tony Jonesee959b02008-02-22 00:13:36 +0100201static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700202manage_start_stop_show(struct device *dev, struct device_attribute *attr,
203 char *buf)
204{
205 struct scsi_disk *sdkp = to_scsi_disk(dev);
206 struct scsi_device *sdp = sdkp->device;
207
208 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
209}
210
211static ssize_t
212manage_start_stop_store(struct device *dev, struct device_attribute *attr,
213 const char *buf, size_t count)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900214{
Tony Jonesee959b02008-02-22 00:13:36 +0100215 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900216 struct scsi_device *sdp = sdkp->device;
217
218 if (!capable(CAP_SYS_ADMIN))
219 return -EACCES;
220
221 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
222
223 return count;
224}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700225static DEVICE_ATTR_RW(manage_start_stop);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900226
Tony Jonesee959b02008-02-22 00:13:36 +0100227static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700228allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
229{
230 struct scsi_disk *sdkp = to_scsi_disk(dev);
231
232 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
233}
234
235static ssize_t
236allow_restart_store(struct device *dev, struct device_attribute *attr,
237 const char *buf, size_t count)
Brian Kinga144c5a2006-06-27 11:10:31 -0500238{
Tony Jonesee959b02008-02-22 00:13:36 +0100239 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500240 struct scsi_device *sdp = sdkp->device;
241
242 if (!capable(CAP_SYS_ADMIN))
243 return -EACCES;
244
245 if (sdp->type != TYPE_DISK)
246 return -EINVAL;
247
248 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
249
250 return count;
251}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700252static DEVICE_ATTR_RW(allow_restart);
Brian Kinga144c5a2006-06-27 11:10:31 -0500253
Tony Jonesee959b02008-02-22 00:13:36 +0100254static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700255cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600256{
Tony Jonesee959b02008-02-22 00:13:36 +0100257 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600258 int ct = sdkp->RCD + 2*sdkp->WCE;
259
260 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
261}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700262static DEVICE_ATTR_RW(cache_type);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600263
Tony Jonesee959b02008-02-22 00:13:36 +0100264static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700265FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600266{
Tony Jonesee959b02008-02-22 00:13:36 +0100267 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600268
269 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
270}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700271static DEVICE_ATTR_RO(FUA);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600272
Tony Jonesee959b02008-02-22 00:13:36 +0100273static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700274protection_type_show(struct device *dev, struct device_attribute *attr,
275 char *buf)
Martin K. Petersene0597d72008-07-17 04:28:34 -0400276{
277 struct scsi_disk *sdkp = to_scsi_disk(dev);
278
279 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
280}
281
282static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700283protection_type_store(struct device *dev, struct device_attribute *attr,
284 const char *buf, size_t count)
Martin K. Petersen81724992012-08-28 14:29:34 -0400285{
286 struct scsi_disk *sdkp = to_scsi_disk(dev);
287 unsigned int val;
288 int err;
289
290 if (!capable(CAP_SYS_ADMIN))
291 return -EACCES;
292
293 err = kstrtouint(buf, 10, &val);
294
295 if (err)
296 return err;
297
298 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
299 sdkp->protection_type = val;
300
301 return count;
302}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700303static DEVICE_ATTR_RW(protection_type);
Martin K. Petersen81724992012-08-28 14:29:34 -0400304
305static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700306protection_mode_show(struct device *dev, struct device_attribute *attr,
307 char *buf)
Martin K. Petersen518fa8e2010-10-08 01:36:24 -0400308{
309 struct scsi_disk *sdkp = to_scsi_disk(dev);
310 struct scsi_device *sdp = sdkp->device;
311 unsigned int dif, dix;
312
313 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
314 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
315
316 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
317 dif = 0;
318 dix = 1;
319 }
320
321 if (!dif && !dix)
322 return snprintf(buf, 20, "none\n");
323
324 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
325}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700326static DEVICE_ATTR_RO(protection_mode);
Martin K. Petersen518fa8e2010-10-08 01:36:24 -0400327
328static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700329app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
Martin K. Petersene0597d72008-07-17 04:28:34 -0400330{
331 struct scsi_disk *sdkp = to_scsi_disk(dev);
332
333 return snprintf(buf, 20, "%u\n", sdkp->ATO);
334}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700335static DEVICE_ATTR_RO(app_tag_own);
Martin K. Petersene0597d72008-07-17 04:28:34 -0400336
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500337static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700338thin_provisioning_show(struct device *dev, struct device_attribute *attr,
339 char *buf)
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500340{
341 struct scsi_disk *sdkp = to_scsi_disk(dev);
342
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500343 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
344}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700345static DEVICE_ATTR_RO(thin_provisioning);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500346
347static const char *lbp_mode[] = {
348 [SD_LBP_FULL] = "full",
349 [SD_LBP_UNMAP] = "unmap",
350 [SD_LBP_WS16] = "writesame_16",
351 [SD_LBP_WS10] = "writesame_10",
352 [SD_LBP_ZERO] = "writesame_zero",
353 [SD_LBP_DISABLE] = "disabled",
354};
355
356static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700357provisioning_mode_show(struct device *dev, struct device_attribute *attr,
358 char *buf)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500359{
360 struct scsi_disk *sdkp = to_scsi_disk(dev);
361
362 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
363}
364
365static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700366provisioning_mode_store(struct device *dev, struct device_attribute *attr,
367 const char *buf, size_t count)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500368{
369 struct scsi_disk *sdkp = to_scsi_disk(dev);
370 struct scsi_device *sdp = sdkp->device;
371
372 if (!capable(CAP_SYS_ADMIN))
373 return -EACCES;
374
375 if (sdp->type != TYPE_DISK)
376 return -EINVAL;
377
378 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
379 sd_config_discard(sdkp, SD_LBP_UNMAP);
380 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
381 sd_config_discard(sdkp, SD_LBP_WS16);
382 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
383 sd_config_discard(sdkp, SD_LBP_WS10);
384 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
385 sd_config_discard(sdkp, SD_LBP_ZERO);
386 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
387 sd_config_discard(sdkp, SD_LBP_DISABLE);
388 else
389 return -EINVAL;
390
391 return count;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500392}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700393static DEVICE_ATTR_RW(provisioning_mode);
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500394
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500395static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700396max_medium_access_timeouts_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500398{
399 struct scsi_disk *sdkp = to_scsi_disk(dev);
400
401 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
402}
403
404static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700405max_medium_access_timeouts_store(struct device *dev,
406 struct device_attribute *attr, const char *buf,
407 size_t count)
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500408{
409 struct scsi_disk *sdkp = to_scsi_disk(dev);
410 int err;
411
412 if (!capable(CAP_SYS_ADMIN))
413 return -EACCES;
414
415 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
416
417 return err ? err : count;
418}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700419static DEVICE_ATTR_RW(max_medium_access_timeouts);
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500420
Martin K. Petersen5db44862012-09-18 12:19:32 -0400421static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700422max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
423 char *buf)
Martin K. Petersen5db44862012-09-18 12:19:32 -0400424{
425 struct scsi_disk *sdkp = to_scsi_disk(dev);
426
427 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
428}
429
430static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700431max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
432 const char *buf, size_t count)
Martin K. Petersen5db44862012-09-18 12:19:32 -0400433{
434 struct scsi_disk *sdkp = to_scsi_disk(dev);
435 struct scsi_device *sdp = sdkp->device;
436 unsigned long max;
437 int err;
438
439 if (!capable(CAP_SYS_ADMIN))
440 return -EACCES;
441
442 if (sdp->type != TYPE_DISK)
443 return -EINVAL;
444
445 err = kstrtoul(buf, 10, &max);
446
447 if (err)
448 return err;
449
450 if (max == 0)
451 sdp->no_write_same = 1;
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400452 else if (max <= SD_MAX_WS16_BLOCKS) {
453 sdp->no_write_same = 0;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400454 sdkp->max_ws_blocks = max;
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400455 }
Martin K. Petersen5db44862012-09-18 12:19:32 -0400456
457 sd_config_write_same(sdkp);
458
459 return count;
460}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700461static DEVICE_ATTR_RW(max_write_same_blocks);
Martin K. Petersen5db44862012-09-18 12:19:32 -0400462
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700463static struct attribute *sd_disk_attrs[] = {
464 &dev_attr_cache_type.attr,
465 &dev_attr_FUA.attr,
466 &dev_attr_allow_restart.attr,
467 &dev_attr_manage_start_stop.attr,
468 &dev_attr_protection_type.attr,
469 &dev_attr_protection_mode.attr,
470 &dev_attr_app_tag_own.attr,
471 &dev_attr_thin_provisioning.attr,
472 &dev_attr_provisioning_mode.attr,
473 &dev_attr_max_write_same_blocks.attr,
474 &dev_attr_max_medium_access_timeouts.attr,
475 NULL,
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600476};
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700477ATTRIBUTE_GROUPS(sd_disk);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600478
479static struct class sd_disk_class = {
480 .name = "scsi_disk",
481 .owner = THIS_MODULE,
Tony Jonesee959b02008-02-22 00:13:36 +0100482 .dev_release = scsi_disk_release,
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700483 .dev_groups = sd_disk_groups,
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600484};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Aaron Lu691e3d32012-11-09 15:27:55 +0800486static const struct dev_pm_ops sd_pm_ops = {
487 .suspend = sd_suspend,
488 .resume = sd_resume,
489 .poweroff = sd_suspend,
490 .restore = sd_resume,
491 .runtime_suspend = sd_suspend,
492 .runtime_resume = sd_resume,
493};
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495static struct scsi_driver sd_template = {
496 .owner = THIS_MODULE,
497 .gendrv = {
498 .name = "sd",
499 .probe = sd_probe,
500 .remove = sd_remove,
501 .shutdown = sd_shutdown,
Aaron Lu691e3d32012-11-09 15:27:55 +0800502 .pm = &sd_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 },
504 .rescan = sd_rescan,
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800505 .done = sd_done,
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500506 .eh_action = sd_eh_action,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507};
508
509/*
Hannes Reinecke0761df92013-05-10 11:06:16 +0200510 * Dummy kobj_map->probe function.
511 * The default ->probe function will call modprobe, which is
512 * pointless as this module is already loaded.
513 */
514static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
515{
516 return NULL;
517}
518
519/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 * Device no to disk mapping:
521 *
522 * major disc2 disc p1
523 * |............|.............|....|....| <- dev_t
524 * 31 20 19 8 7 4 3 0
525 *
526 * Inside a major, we have 16k disks, however mapped non-
527 * contiguously. The first 16 disks are for major0, the next
528 * ones with major1, ... Disk 256 is for major0 again, disk 272
529 * for major1, ...
530 * As we stay compatible with our numbering scheme, we can reuse
531 * the well-know SCSI majors 8, 65--71, 136--143.
532 */
533static int sd_major(int major_idx)
534{
535 switch (major_idx) {
536 case 0:
537 return SCSI_DISK0_MAJOR;
538 case 1 ... 7:
539 return SCSI_DISK1_MAJOR + major_idx - 1;
540 case 8 ... 15:
541 return SCSI_DISK8_MAJOR + major_idx - 8;
542 default:
543 BUG();
544 return 0; /* shut up gcc */
545 }
546}
547
Alan Stern39b7f1e2005-11-04 14:44:41 -0500548static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549{
550 struct scsi_disk *sdkp = NULL;
551
Alan Stern39b7f1e2005-11-04 14:44:41 -0500552 if (disk->private_data) {
553 sdkp = scsi_disk(disk);
554 if (scsi_device_get(sdkp->device) == 0)
Tony Jonesee959b02008-02-22 00:13:36 +0100555 get_device(&sdkp->dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500556 else
557 sdkp = NULL;
558 }
559 return sdkp;
560}
561
562static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
563{
564 struct scsi_disk *sdkp;
565
Arjan van de Ven0b950672006-01-11 13:16:10 +0100566 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500567 sdkp = __scsi_disk_get(disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100568 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 return sdkp;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500570}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Alan Stern39b7f1e2005-11-04 14:44:41 -0500572static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
573{
574 struct scsi_disk *sdkp;
575
Arjan van de Ven0b950672006-01-11 13:16:10 +0100576 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500577 sdkp = dev_get_drvdata(dev);
578 if (sdkp)
579 sdkp = __scsi_disk_get(sdkp->disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100580 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 return sdkp;
582}
583
584static void scsi_disk_put(struct scsi_disk *sdkp)
585{
586 struct scsi_device *sdev = sdkp->device;
587
Arjan van de Ven0b950672006-01-11 13:16:10 +0100588 mutex_lock(&sd_ref_mutex);
Tony Jonesee959b02008-02-22 00:13:36 +0100589 put_device(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100591 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592}
593
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400594static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
595{
596 unsigned int prot_op = SCSI_PROT_NORMAL;
597 unsigned int dix = scsi_prot_sg_count(scmd);
598
599 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
600 if (dif && dix)
601 prot_op = SCSI_PROT_READ_PASS;
602 else if (dif && !dix)
603 prot_op = SCSI_PROT_READ_STRIP;
604 else if (!dif && dix)
605 prot_op = SCSI_PROT_READ_INSERT;
606 } else {
607 if (dif && dix)
608 prot_op = SCSI_PROT_WRITE_PASS;
609 else if (dif && !dix)
610 prot_op = SCSI_PROT_WRITE_INSERT;
611 else if (!dif && dix)
612 prot_op = SCSI_PROT_WRITE_STRIP;
613 }
614
615 scsi_set_prot_op(scmd, prot_op);
616 scsi_set_prot_type(scmd, dif);
617}
618
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500619static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
620{
621 struct request_queue *q = sdkp->disk->queue;
622 unsigned int logical_block_size = sdkp->device->sector_size;
623 unsigned int max_blocks = 0;
624
625 q->limits.discard_zeroes_data = sdkp->lbprz;
Martin K. Petersen2a8cfad2011-05-18 00:31:07 -0400626 q->limits.discard_alignment = sdkp->unmap_alignment *
627 logical_block_size;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500628 q->limits.discard_granularity =
629 max(sdkp->physical_block_size,
630 sdkp->unmap_granularity * logical_block_size);
631
Martin K. Petersen89730392012-02-13 15:39:00 -0500632 sdkp->provisioning_mode = mode;
633
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500634 switch (mode) {
635
636 case SD_LBP_DISABLE:
637 q->limits.max_discard_sectors = 0;
638 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
639 return;
640
641 case SD_LBP_UNMAP:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400642 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
643 (u32)SD_MAX_WS16_BLOCKS);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500644 break;
645
646 case SD_LBP_WS16:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400647 max_blocks = min_not_zero(sdkp->max_ws_blocks,
648 (u32)SD_MAX_WS16_BLOCKS);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500649 break;
650
651 case SD_LBP_WS10:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400652 max_blocks = min_not_zero(sdkp->max_ws_blocks,
653 (u32)SD_MAX_WS10_BLOCKS);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500654 break;
655
656 case SD_LBP_ZERO:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400657 max_blocks = min_not_zero(sdkp->max_ws_blocks,
658 (u32)SD_MAX_WS10_BLOCKS);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500659 q->limits.discard_zeroes_data = 1;
660 break;
661 }
662
663 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
664 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500665}
666
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667/**
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400668 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200669 * @sdp: scsi device to operate one
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500670 * @rq: Request to prepare
671 *
672 * Will issue either UNMAP or WRITE SAME(16) depending on preference
673 * indicated by target device.
674 **/
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400675static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500676{
677 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400678 sector_t sector = blk_rq_pos(rq);
679 unsigned int nr_sectors = blk_rq_sectors(rq);
680 unsigned int nr_bytes = blk_rq_bytes(rq);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200681 unsigned int len;
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900682 int ret;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500683 char *buf;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200684 struct page *page;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500685
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400686 sector >>= ilog2(sdp->sector_size) - 9;
687 nr_sectors >>= ilog2(sdp->sector_size) - 9;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500688 rq->timeout = SD_TIMEOUT;
689
690 memset(rq->cmd, 0, rq->cmd_len);
691
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200692 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
693 if (!page)
694 return BLKPREP_DEFER;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500695
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500696 switch (sdkp->provisioning_mode) {
697 case SD_LBP_UNMAP:
698 buf = page_address(page);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200699
700 rq->cmd_len = 10;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500701 rq->cmd[0] = UNMAP;
702 rq->cmd[8] = 24;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500703
704 put_unaligned_be16(6 + 16, &buf[0]);
705 put_unaligned_be16(16, &buf[2]);
706 put_unaligned_be64(sector, &buf[8]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200707 put_unaligned_be32(nr_sectors, &buf[16]);
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500708
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200709 len = 24;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500710 break;
711
712 case SD_LBP_WS16:
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200713 rq->cmd_len = 16;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500714 rq->cmd[0] = WRITE_SAME_16;
715 rq->cmd[1] = 0x8; /* UNMAP */
716 put_unaligned_be64(sector, &rq->cmd[2]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200717 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
718
719 len = sdkp->device->sector_size;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500720 break;
721
722 case SD_LBP_WS10:
723 case SD_LBP_ZERO:
724 rq->cmd_len = 10;
725 rq->cmd[0] = WRITE_SAME;
726 if (sdkp->provisioning_mode == SD_LBP_WS10)
727 rq->cmd[1] = 0x8; /* UNMAP */
728 put_unaligned_be32(sector, &rq->cmd[2]);
729 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
730
731 len = sdkp->device->sector_size;
732 break;
733
734 default:
Martin K. Petersen09b9cc42011-03-22 00:27:42 -0400735 ret = BLKPREP_KILL;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500736 goto out;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500737 }
738
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200739 blk_add_request_payload(rq, page, len);
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900740 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
741 rq->buffer = page_address(page);
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400742 rq->__data_len = nr_bytes;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500743
744out:
FUJITA Tomonori610a6342010-07-08 10:16:17 +0200745 if (ret != BLKPREP_OK) {
746 __free_page(page);
747 rq->buffer = NULL;
748 }
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900749 return ret;
750}
751
Martin K. Petersen5db44862012-09-18 12:19:32 -0400752static void sd_config_write_same(struct scsi_disk *sdkp)
753{
754 struct request_queue *q = sdkp->disk->queue;
755 unsigned int logical_block_size = sdkp->device->sector_size;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400756
757 if (sdkp->device->no_write_same) {
758 sdkp->max_ws_blocks = 0;
759 goto out;
760 }
761
762 /* Some devices can not handle block counts above 0xffff despite
763 * supporting WRITE SAME(16). Consequently we default to 64k
764 * blocks per I/O unless the device explicitly advertises a
765 * bigger limit.
766 */
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400767 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
768 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
769 (u32)SD_MAX_WS16_BLOCKS);
770 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
771 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
772 (u32)SD_MAX_WS10_BLOCKS);
773 else {
774 sdkp->device->no_write_same = 1;
775 sdkp->max_ws_blocks = 0;
776 }
Martin K. Petersen5db44862012-09-18 12:19:32 -0400777
778out:
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400779 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
780 (logical_block_size >> 9));
Martin K. Petersen5db44862012-09-18 12:19:32 -0400781}
782
783/**
784 * sd_setup_write_same_cmnd - write the same data to multiple blocks
785 * @sdp: scsi device to operate one
786 * @rq: Request to prepare
787 *
788 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
789 * preference indicated by target device.
790 **/
791static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
792{
793 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
794 struct bio *bio = rq->bio;
795 sector_t sector = blk_rq_pos(rq);
796 unsigned int nr_sectors = blk_rq_sectors(rq);
797 unsigned int nr_bytes = blk_rq_bytes(rq);
798 int ret;
799
800 if (sdkp->device->no_write_same)
801 return BLKPREP_KILL;
802
803 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
804
805 sector >>= ilog2(sdp->sector_size) - 9;
806 nr_sectors >>= ilog2(sdp->sector_size) - 9;
807
808 rq->__data_len = sdp->sector_size;
809 rq->timeout = SD_WRITE_SAME_TIMEOUT;
810 memset(rq->cmd, 0, rq->cmd_len);
811
812 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
813 rq->cmd_len = 16;
814 rq->cmd[0] = WRITE_SAME_16;
815 put_unaligned_be64(sector, &rq->cmd[2]);
816 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
817 } else {
818 rq->cmd_len = 10;
819 rq->cmd[0] = WRITE_SAME;
820 put_unaligned_be32(sector, &rq->cmd[2]);
821 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
822 }
823
824 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
825 rq->__data_len = nr_bytes;
826
827 return ret;
828}
829
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900830static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
831{
Mike Christiee3b3e622010-08-11 11:06:25 -0500832 rq->timeout = SD_FLUSH_TIMEOUT;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900833 rq->retries = SD_MAX_RETRIES;
834 rq->cmd[0] = SYNCHRONIZE_CACHE;
835 rq->cmd_len = 10;
836
837 return scsi_setup_blk_pc_cmnd(sdp, rq);
838}
839
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900840static void sd_unprep_fn(struct request_queue *q, struct request *rq)
841{
Ewan D. Milne085b5132012-11-02 09:38:34 -0400842 struct scsi_cmnd *SCpnt = rq->special;
843
FUJITA Tomonori610a6342010-07-08 10:16:17 +0200844 if (rq->cmd_flags & REQ_DISCARD) {
845 free_page((unsigned long)rq->buffer);
846 rq->buffer = NULL;
847 }
Ewan D. Milne085b5132012-11-02 09:38:34 -0400848 if (SCpnt->cmnd != rq->cmd) {
849 mempool_free(SCpnt->cmnd, sd_cdb_pool);
850 SCpnt->cmnd = NULL;
851 SCpnt->cmd_len = 0;
852 }
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500853}
854
855/**
Petr Uzel2db93ce2012-02-24 16:56:54 +0100856 * sd_prep_fn - build a scsi (read or write) command from
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 * information in the request structure.
858 * @SCpnt: pointer to mid-level's per scsi command structure that
859 * contains request and into which the scsi command is written
860 *
861 * Returns 1 if successful and 0 if error (or cannot be done now).
862 **/
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500863static int sd_prep_fn(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864{
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500865 struct scsi_cmnd *SCpnt;
866 struct scsi_device *sdp = q->queuedata;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100867 struct gendisk *disk = rq->rq_disk;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400868 struct scsi_disk *sdkp;
Tejun Heo83096eb2009-05-07 22:24:39 +0900869 sector_t block = blk_rq_pos(rq);
Linus Torvalds18351072008-08-05 21:42:21 -0700870 sector_t threshold;
Tejun Heo83096eb2009-05-07 22:24:39 +0900871 unsigned int this_count = blk_rq_sectors(rq);
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400872 int ret, host_dif;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400873 unsigned char protect;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500874
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500875 /*
876 * Discard request come in as REQ_TYPE_FS but we turn them into
877 * block PC requests to make life easier.
878 */
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200879 if (rq->cmd_flags & REQ_DISCARD) {
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400880 ret = sd_setup_discard_cmnd(sdp, rq);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200881 goto out;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400882 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
883 ret = sd_setup_write_same_cmnd(sdp, rq);
884 goto out;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900885 } else if (rq->cmd_flags & REQ_FLUSH) {
886 ret = scsi_setup_flush_cmnd(sdp, rq);
887 goto out;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200888 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500889 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
890 goto out;
891 } else if (rq->cmd_type != REQ_TYPE_FS) {
892 ret = BLKPREP_KILL;
893 goto out;
894 }
895 ret = scsi_setup_fs_cmnd(sdp, rq);
896 if (ret != BLKPREP_OK)
897 goto out;
898 SCpnt = rq->special;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400899 sdkp = scsi_disk(disk);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500900
901 /* from here on until we're complete, any goto out
902 * is used for a killable error condition */
903 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500905 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
Petr Uzel2db93ce2012-02-24 16:56:54 +0100906 "sd_prep_fn: block=%llu, "
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500907 "count=%d\n",
908 (unsigned long long)block,
909 this_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
911 if (!sdp || !scsi_device_online(sdp) ||
Tejun Heo83096eb2009-05-07 22:24:39 +0900912 block + blk_rq_sectors(rq) > get_capacity(disk)) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500913 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900914 "Finishing %u sectors\n",
915 blk_rq_sectors(rq)));
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500916 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
917 "Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500918 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 }
920
921 if (sdp->changed) {
922 /*
923 * quietly refuse to do anything to a changed disc until
924 * the changed bit has been reset
925 */
Alan Stern3ff55882010-09-07 11:44:01 -0400926 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500927 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 }
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500929
Hans de Goedea0899d42008-01-20 11:12:26 +0100930 /*
Linus Torvalds18351072008-08-05 21:42:21 -0700931 * Some SD card readers can't handle multi-sector accesses which touch
932 * the last one or two hardware sectors. Split accesses as needed.
Hans de Goedea0899d42008-01-20 11:12:26 +0100933 */
Linus Torvalds18351072008-08-05 21:42:21 -0700934 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
935 (sdp->sector_size / 512);
936
937 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
938 if (block < threshold) {
939 /* Access up to the threshold but not beyond */
940 this_count = threshold - block;
941 } else {
942 /* Access only a single hardware sector */
943 this_count = sdp->sector_size / 512;
944 }
945 }
Hans de Goedea0899d42008-01-20 11:12:26 +0100946
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500947 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
948 (unsigned long long)block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950 /*
951 * If we have a 1K hardware sectorsize, prevent access to single
952 * 512 byte sectors. In theory we could handle this - in fact
953 * the scsi cdrom driver must be able to handle this because
954 * we typically use 1K blocksizes, and cdroms typically have
955 * 2K hardware sectorsizes. Of course, things are simpler
956 * with the cdrom, since it is read-only. For performance
957 * reasons, the filesystems should be able to handle this
958 * and not force the scsi disk driver to use bounce buffers
959 * for this.
960 */
961 if (sdp->sector_size == 1024) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900962 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500963 scmd_printk(KERN_ERR, SCpnt,
964 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500965 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 } else {
967 block = block >> 1;
968 this_count = this_count >> 1;
969 }
970 }
971 if (sdp->sector_size == 2048) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900972 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500973 scmd_printk(KERN_ERR, SCpnt,
974 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500975 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 } else {
977 block = block >> 2;
978 this_count = this_count >> 2;
979 }
980 }
981 if (sdp->sector_size == 4096) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900982 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500983 scmd_printk(KERN_ERR, SCpnt,
984 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500985 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 } else {
987 block = block >> 3;
988 this_count = this_count >> 3;
989 }
990 }
991 if (rq_data_dir(rq) == WRITE) {
992 if (!sdp->writeable) {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500993 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 }
995 SCpnt->cmnd[0] = WRITE_6;
996 SCpnt->sc_data_direction = DMA_TO_DEVICE;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400997
Martin K. Petersen8c579ab2012-08-28 14:29:33 -0400998 if (blk_integrity_rq(rq))
999 sd_dif_prepare(rq, block, sdp->sector_size);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001000
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 } else if (rq_data_dir(rq) == READ) {
1002 SCpnt->cmnd[0] = READ_6;
1003 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
1004 } else {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001005 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
James Bottomley7f9a6bc2007-08-04 10:06:25 -05001006 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 }
1008
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001009 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +09001010 "%s %d/%u 512 byte blocks.\n",
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001011 (rq_data_dir(rq) == WRITE) ?
1012 "writing" : "reading", this_count,
Tejun Heo83096eb2009-05-07 22:24:39 +09001013 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001015 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
Martin K. Petersenbd623e72008-09-19 18:47:19 -04001016 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1017 if (host_dif)
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001018 protect = 1 << 5;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001019 else
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001020 protect = 0;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001021
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001022 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1023 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1024
1025 if (unlikely(SCpnt->cmnd == NULL)) {
1026 ret = BLKPREP_DEFER;
1027 goto out;
1028 }
1029
1030 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1031 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1032 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1033 SCpnt->cmnd[7] = 0x18;
1034 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001035 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001036
1037 /* LBA */
1038 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1039 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1040 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1041 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1042 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1043 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1044 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1045 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1046
1047 /* Expected Indirect LBA */
1048 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1049 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1050 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1051 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1052
1053 /* Transfer length */
1054 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1055 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1056 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1057 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
Jason J. Herne53ad5702012-11-14 17:03:22 -05001058 } else if (sdp->use_16_for_rw) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 SCpnt->cmnd[0] += READ_16 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001060 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1062 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1063 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1064 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1065 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1066 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1067 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1068 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1069 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1070 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1071 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1072 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1073 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1074 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001075 scsi_device_protection(SCpnt->device) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 SCpnt->device->use_10_for_rw) {
1077 if (this_count > 0xffff)
1078 this_count = 0xffff;
1079
1080 SCpnt->cmnd[0] += READ_10 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001081 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1083 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1084 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1085 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1086 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1087 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1088 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1089 } else {
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001090 if (unlikely(rq->cmd_flags & REQ_FUA)) {
Tejun Heo007365a2006-01-06 09:53:52 +01001091 /*
1092 * This happens only if this drive failed
1093 * 10byte rw command with ILLEGAL_REQUEST
1094 * during operation and thus turned off
1095 * use_10_for_rw.
1096 */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001097 scmd_printk(KERN_ERR, SCpnt,
1098 "FUA write on READ/WRITE(6) drive\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -05001099 goto out;
Tejun Heo007365a2006-01-06 09:53:52 +01001100 }
1101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1103 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1104 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1105 SCpnt->cmnd[4] = (unsigned char) this_count;
1106 SCpnt->cmnd[5] = 0;
1107 }
Boaz Harrosh30b0c372007-12-13 13:47:40 +02001108 SCpnt->sdb.length = this_count * sdp->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001110 /* If DIF or DIX is enabled, tell HBA how to handle request */
Martin K. Petersenbd623e72008-09-19 18:47:19 -04001111 if (host_dif || scsi_prot_sg_count(SCpnt))
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001112 sd_prot_op(SCpnt, host_dif);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 /*
1115 * We shouldn't disconnect in the middle of a sector, so with a dumb
1116 * host adapter, it's safe to assume that we can at least transfer
1117 * this many bytes between each connect / disconnect.
1118 */
1119 SCpnt->transfersize = sdp->sector_size;
1120 SCpnt->underflow = this_count << 9;
1121 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122
1123 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 * This indicates that the command is ready from our end to be
1125 * queued.
1126 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -05001127 ret = BLKPREP_OK;
1128 out:
1129 return scsi_prep_return(q, rq, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130}
1131
1132/**
1133 * sd_open - open a scsi disk device
1134 * @inode: only i_rdev member may be used
1135 * @filp: only f_mode and f_flags may be used
1136 *
1137 * Returns 0 if successful. Returns a negated errno value in case
1138 * of error.
1139 *
1140 * Note: This can be called from a user context (e.g. fsck(1) )
1141 * or from within the kernel (e.g. as a result of a mount(1) ).
1142 * In the latter case @inode and @filp carry an abridged amount
1143 * of information as noted above.
Arnd Bergmann409f3492010-07-07 16:51:29 +02001144 *
1145 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 **/
Al Viro0338e292008-03-02 10:41:04 -05001147static int sd_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148{
Al Viro0338e292008-03-02 10:41:04 -05001149 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 struct scsi_device *sdev;
1151 int retval;
1152
Al Viro0338e292008-03-02 10:41:04 -05001153 if (!sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 return -ENXIO;
1155
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001156 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
1158 sdev = sdkp->device;
1159
1160 /*
1161 * If the device is in error recovery, wait until it is done.
1162 * If the device is offline, then disallow any access to it.
1163 */
1164 retval = -ENXIO;
1165 if (!scsi_block_when_processing_errors(sdev))
1166 goto error_out;
1167
1168 if (sdev->removable || sdkp->write_prot)
Al Viro0338e292008-03-02 10:41:04 -05001169 check_disk_change(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
1171 /*
1172 * If the drive is empty, just let the open fail.
1173 */
1174 retval = -ENOMEDIUM;
Al Viro0338e292008-03-02 10:41:04 -05001175 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 goto error_out;
1177
1178 /*
1179 * If the device has the write protect tab set, have the open fail
1180 * if the user expects to be able to write to the thing.
1181 */
1182 retval = -EROFS;
Al Viro0338e292008-03-02 10:41:04 -05001183 if (sdkp->write_prot && (mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 goto error_out;
1185
1186 /*
1187 * It is possible that the disk changing stuff resulted in
1188 * the device being taken offline. If this is the case,
1189 * report this to the user, and don't pretend that the
1190 * open actually succeeded.
1191 */
1192 retval = -ENXIO;
1193 if (!scsi_device_online(sdev))
1194 goto error_out;
1195
Arnd Bergmann409f3492010-07-07 16:51:29 +02001196 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 if (scsi_block_when_processing_errors(sdev))
1198 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1199 }
1200
1201 return 0;
1202
1203error_out:
1204 scsi_disk_put(sdkp);
1205 return retval;
1206}
1207
1208/**
1209 * sd_release - invoked when the (last) close(2) is called on this
1210 * scsi disk.
1211 * @inode: only i_rdev member may be used
1212 * @filp: only f_mode and f_flags may be used
1213 *
1214 * Returns 0.
1215 *
1216 * Note: may block (uninterruptible) if error recovery is underway
1217 * on this disk.
Arnd Bergmann409f3492010-07-07 16:51:29 +02001218 *
1219 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 **/
Al Virodb2a1442013-05-05 21:52:57 -04001221static void sd_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 struct scsi_disk *sdkp = scsi_disk(disk);
1224 struct scsi_device *sdev = sdkp->device;
1225
James Bottomley56937f72007-03-11 12:25:33 -05001226 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
Alan Stern7e443312010-09-07 11:27:52 -04001228 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 if (scsi_block_when_processing_errors(sdev))
1230 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1231 }
1232
1233 /*
1234 * XXX and what if there are packets in flight and this close()
1235 * XXX is followed by a "rmmod sd_mod"?
1236 */
Alan Stern478a8a02010-06-16 14:52:17 -04001237
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 scsi_disk_put(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239}
1240
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001241static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242{
1243 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1244 struct scsi_device *sdp = sdkp->device;
1245 struct Scsi_Host *host = sdp->host;
1246 int diskinfo[4];
1247
1248 /* default to most commonly used values */
1249 diskinfo[0] = 0x40; /* 1 << 6 */
1250 diskinfo[1] = 0x20; /* 1 << 5 */
1251 diskinfo[2] = sdkp->capacity >> 11;
1252
1253 /* override with calculated, extended default, or driver values */
1254 if (host->hostt->bios_param)
1255 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1256 else
1257 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1258
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001259 geo->heads = diskinfo[0];
1260 geo->sectors = diskinfo[1];
1261 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 return 0;
1263}
1264
1265/**
1266 * sd_ioctl - process an ioctl
1267 * @inode: only i_rdev/i_bdev members may be used
1268 * @filp: only f_mode and f_flags may be used
1269 * @cmd: ioctl command number
1270 * @arg: this is third argument given to ioctl(2) system call.
1271 * Often contains a pointer.
1272 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001273 * Returns 0 if successful (some ioctls return positive numbers on
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 * success as well). Returns a negated errno value in case of error.
1275 *
1276 * Note: most ioctls are forward onto the block subsystem or further
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +02001277 * down in the scsi subsystem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 **/
Al Viro0338e292008-03-02 10:41:04 -05001279static int sd_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 unsigned int cmd, unsigned long arg)
1281{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 struct gendisk *disk = bdev->bd_disk;
Nao Nishijimafe2d1852011-08-25 18:04:14 +09001283 struct scsi_disk *sdkp = scsi_disk(disk);
1284 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 void __user *p = (void __user *)arg;
1286 int error;
1287
Nao Nishijimafe2d1852011-08-25 18:04:14 +09001288 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1289 "cmd=0x%x\n", disk->disk_name, cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +01001291 error = scsi_verify_blk_ioctl(bdev, cmd);
1292 if (error < 0)
1293 return error;
1294
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 /*
1296 * If we are in the middle of error recovery, don't let anyone
1297 * else try and use this device. Also, if error recovery fails, it
1298 * may try and take the device offline, in which case all further
1299 * access to the device is prohibited.
1300 */
Al Viro83ff6fe2008-03-02 08:15:49 -05001301 error = scsi_nonblockable_ioctl(sdp, cmd, p,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +01001302 (mode & FMODE_NDELAY) != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 if (!scsi_block_when_processing_errors(sdp) || !error)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001304 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 /*
1307 * Send SCSI addressing ioctls directly to mid level, send other
1308 * ioctls to block level and then onto mid level if they can't be
1309 * resolved.
1310 */
1311 switch (cmd) {
1312 case SCSI_IOCTL_GET_IDLUN:
1313 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001314 error = scsi_ioctl(sdp, cmd, p);
1315 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 default:
Paolo Bonzini577ebb32012-01-12 16:01:27 +01001317 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 if (error != -ENOTTY)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001319 break;
1320 error = scsi_ioctl(sdp, cmd, p);
1321 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 }
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001323out:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001324 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325}
1326
1327static void set_media_not_present(struct scsi_disk *sdkp)
1328{
Tejun Heo2bae0092010-12-18 18:42:23 +01001329 if (sdkp->media_present)
1330 sdkp->device->changed = 1;
1331
1332 if (sdkp->device->removable) {
1333 sdkp->media_present = 0;
1334 sdkp->capacity = 0;
1335 }
1336}
1337
1338static int media_not_present(struct scsi_disk *sdkp,
1339 struct scsi_sense_hdr *sshdr)
1340{
1341 if (!scsi_sense_valid(sshdr))
1342 return 0;
1343
1344 /* not invoked for commands that could return deferred errors */
1345 switch (sshdr->sense_key) {
1346 case UNIT_ATTENTION:
1347 case NOT_READY:
1348 /* medium not present */
1349 if (sshdr->asc == 0x3A) {
1350 set_media_not_present(sdkp);
1351 return 1;
1352 }
1353 }
1354 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355}
1356
1357/**
Tejun Heo2bae0092010-12-18 18:42:23 +01001358 * sd_check_events - check media events
1359 * @disk: kernel device descriptor
1360 * @clearing: disk events currently being cleared
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 *
Tejun Heo2bae0092010-12-18 18:42:23 +01001362 * Returns mask of DISK_EVENT_*.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 *
1364 * Note: this function is invoked from the block subsystem.
1365 **/
Tejun Heo2bae0092010-12-18 18:42:23 +01001366static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367{
1368 struct scsi_disk *sdkp = scsi_disk(disk);
1369 struct scsi_device *sdp = sdkp->device;
James Bottomley001aac22007-12-02 19:10:40 +02001370 struct scsi_sense_hdr *sshdr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 int retval;
1372
Tejun Heo2bae0092010-12-18 18:42:23 +01001373 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374
1375 /*
1376 * If the device is offline, don't send any commands - just pretend as
1377 * if the command failed. If the device ever comes back online, we
1378 * can deal with it then. It is only because of unrecoverable errors
1379 * that we would ever take a device offline in the first place.
1380 */
Kay Sievers285e9672007-08-14 14:10:39 +02001381 if (!scsi_device_online(sdp)) {
1382 set_media_not_present(sdkp);
Kay Sievers285e9672007-08-14 14:10:39 +02001383 goto out;
1384 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
1386 /*
1387 * Using TEST_UNIT_READY enables differentiation between drive with
1388 * no cartridge loaded - NOT READY, drive with changed cartridge -
1389 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1390 *
1391 * Drives that auto spin down. eg iomega jaz 1G, will be started
1392 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1393 * sd_revalidate() is called.
1394 */
1395 retval = -ENODEV;
Kay Sievers285e9672007-08-14 14:10:39 +02001396
James Bottomley001aac22007-12-02 19:10:40 +02001397 if (scsi_block_when_processing_errors(sdp)) {
1398 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1399 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1400 sshdr);
1401 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
Tejun Heo2bae0092010-12-18 18:42:23 +01001403 /* failed to execute TUR, assume media not present */
1404 if (host_byte(retval)) {
Kay Sievers285e9672007-08-14 14:10:39 +02001405 set_media_not_present(sdkp);
Kay Sievers285e9672007-08-14 14:10:39 +02001406 goto out;
1407 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408
Tejun Heo2bae0092010-12-18 18:42:23 +01001409 if (media_not_present(sdkp, sshdr))
1410 goto out;
1411
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 /*
1413 * For removable scsi disk we have to recognise the presence
Tejun Heo2bae0092010-12-18 18:42:23 +01001414 * of a disk in the drive.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 */
Tejun Heo2bae0092010-12-18 18:42:23 +01001416 if (!sdkp->media_present)
1417 sdp->changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 sdkp->media_present = 1;
Kay Sievers285e9672007-08-14 14:10:39 +02001419out:
Alan Stern3ff55882010-09-07 11:44:01 -04001420 /*
Tejun Heo2bae0092010-12-18 18:42:23 +01001421 * sdp->changed is set under the following conditions:
Alan Stern3ff55882010-09-07 11:44:01 -04001422 *
Tejun Heo2bae0092010-12-18 18:42:23 +01001423 * Medium present state has changed in either direction.
1424 * Device has indicated UNIT_ATTENTION.
Alan Stern3ff55882010-09-07 11:44:01 -04001425 */
James Bottomley001aac22007-12-02 19:10:40 +02001426 kfree(sshdr);
Tejun Heo2bae0092010-12-18 18:42:23 +01001427 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1428 sdp->changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430}
1431
Martin K. Petersene73aec82007-02-27 22:40:55 -05001432static int sd_sync_cache(struct scsi_disk *sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 int retries, res;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001435 struct scsi_device *sdp = sdkp->device;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001436 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
1438 if (!scsi_device_online(sdp))
1439 return -ENODEV;
1440
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 for (retries = 3; retries > 0; --retries) {
1443 unsigned char cmd[10] = { 0 };
1444
1445 cmd[0] = SYNCHRONIZE_CACHE;
1446 /*
1447 * Leave the rest of the command zero to indicate
1448 * flush everything.
1449 */
Lin Ming9b214932013-03-23 11:42:25 +08001450 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1451 &sshdr, SD_FLUSH_TIMEOUT,
1452 SD_MAX_RETRIES, NULL, REQ_PM);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001453 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 break;
1455 }
1456
Martin K. Petersene73aec82007-02-27 22:40:55 -05001457 if (res) {
1458 sd_print_result(sdkp, res);
1459 if (driver_byte(res) & DRIVER_SENSE)
1460 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 }
1462
Tejun Heo37210502007-03-21 00:07:18 +09001463 if (res)
1464 return -EIO;
1465 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466}
1467
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468static void sd_rescan(struct device *dev)
1469{
Alan Stern39b7f1e2005-11-04 14:44:41 -05001470 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1471
1472 if (sdkp) {
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -06001473 revalidate_disk(sdkp->disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001474 scsi_disk_put(sdkp);
1475 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476}
1477
1478
1479#ifdef CONFIG_COMPAT
1480/*
1481 * This gets directly called from VFS. When the ioctl
1482 * is not recognized we go back to the other translation paths.
1483 */
Al Viro0338e292008-03-02 10:41:04 -05001484static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1485 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486{
Al Viro0338e292008-03-02 10:41:04 -05001487 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +01001488 int ret;
1489
1490 ret = scsi_verify_blk_ioctl(bdev, cmd);
1491 if (ret < 0)
1492 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493
1494 /*
1495 * If we are in the middle of error recovery, don't let anyone
1496 * else try and use this device. Also, if error recovery fails, it
1497 * may try and take the device offline, in which case all further
1498 * access to the device is prohibited.
1499 */
1500 if (!scsi_block_when_processing_errors(sdev))
1501 return -ENODEV;
1502
1503 if (sdev->host->hostt->compat_ioctl) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1505
1506 return ret;
1507 }
1508
1509 /*
1510 * Let the static ioctl translation table take care of it.
1511 */
1512 return -ENOIOCTLCMD;
1513}
1514#endif
1515
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07001516static const struct block_device_operations sd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 .owner = THIS_MODULE,
Al Viro0338e292008-03-02 10:41:04 -05001518 .open = sd_open,
1519 .release = sd_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001520 .ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001521 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522#ifdef CONFIG_COMPAT
Al Viro0338e292008-03-02 10:41:04 -05001523 .compat_ioctl = sd_compat_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524#endif
Tejun Heo2bae0092010-12-18 18:42:23 +01001525 .check_events = sd_check_events,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 .revalidate_disk = sd_revalidate_disk,
Tejun Heo72ec24b2010-05-15 20:09:32 +02001527 .unlock_native_capacity = sd_unlock_native_capacity,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528};
1529
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001530/**
1531 * sd_eh_action - error handling callback
1532 * @scmd: sd-issued command that has failed
1533 * @eh_cmnd: The command that was sent during error handling
1534 * @eh_cmnd_len: Length of eh_cmnd in bytes
1535 * @eh_disp: The recovery disposition suggested by the midlayer
1536 *
1537 * This function is called by the SCSI midlayer upon completion of
1538 * an error handling command (TEST UNIT READY, START STOP UNIT,
1539 * etc.) The command sent to the device by the error handler is
1540 * stored in eh_cmnd. The result of sending the eh command is
1541 * passed in eh_disp.
1542 **/
1543static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1544 int eh_cmnd_len, int eh_disp)
1545{
1546 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1547
1548 if (!scsi_device_online(scmd->device) ||
1549 !scsi_medium_access_command(scmd))
1550 return eh_disp;
1551
1552 /*
1553 * The device has timed out executing a medium access command.
1554 * However, the TEST UNIT READY command sent during error
1555 * handling completed successfully. Either the device is in the
1556 * process of recovering or has it suffered an internal failure
1557 * that prevents access to the storage medium.
1558 */
1559 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1560 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1561 sdkp->medium_access_timed_out++;
1562
1563 /*
1564 * If the device keeps failing read/write commands but TEST UNIT
1565 * READY always completes successfully we assume that medium
1566 * access is no longer possible and take the device offline.
1567 */
1568 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1569 scmd_printk(KERN_ERR, scmd,
1570 "Medium access timeout failure. Offlining disk!\n");
1571 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1572
1573 return FAILED;
1574 }
1575
1576 return eh_disp;
1577}
1578
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001579static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1580{
Tejun Heo83096eb2009-05-07 22:24:39 +09001581 u64 start_lba = blk_rq_pos(scmd->request);
1582 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001583 u64 bad_lba;
1584 int info_valid;
James Bottomleya8733c72010-12-17 15:36:34 -05001585 /*
1586 * resid is optional but mostly filled in. When it's unused,
1587 * its value is zero, so we assume the whole buffer transferred
1588 */
1589 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1590 unsigned int good_bytes;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001591
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001592 if (scmd->request->cmd_type != REQ_TYPE_FS)
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001593 return 0;
1594
1595 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1596 SCSI_SENSE_BUFFERSIZE,
1597 &bad_lba);
1598 if (!info_valid)
1599 return 0;
1600
1601 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1602 return 0;
1603
1604 if (scmd->device->sector_size < 512) {
1605 /* only legitimate sector_size here is 256 */
1606 start_lba <<= 1;
1607 end_lba <<= 1;
1608 } else {
1609 /* be careful ... don't want any overflows */
1610 u64 factor = scmd->device->sector_size / 512;
1611 do_div(start_lba, factor);
1612 do_div(end_lba, factor);
1613 }
1614
1615 /* The bad lba was reported incorrectly, we have no idea where
1616 * the error is.
1617 */
1618 if (bad_lba < start_lba || bad_lba >= end_lba)
1619 return 0;
1620
1621 /* This computation should always be done in terms of
1622 * the resolution of the device's medium.
1623 */
James Bottomleya8733c72010-12-17 15:36:34 -05001624 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1625 return min(good_bytes, transferred);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001626}
1627
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628/**
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001629 * sd_done - bottom half handler: called when the lower level
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 * driver has completed (successfully or otherwise) a scsi command.
1631 * @SCpnt: mid-level's per command structure.
1632 *
1633 * Note: potentially run from within an ISR. Must not block.
1634 **/
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001635static int sd_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636{
1637 int result = SCpnt->result;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001638 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 struct scsi_sense_hdr sshdr;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001640 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
Martin K. Petersen26e85fc2012-09-18 12:19:31 -04001641 struct request *req = SCpnt->request;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 int sense_valid = 0;
1643 int sense_deferred = 0;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001644 unsigned char op = SCpnt->cmnd[0];
Martin K. Petersen5db44862012-09-18 12:19:32 -04001645 unsigned char unmap = SCpnt->cmnd[1] & 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646
Martin K. Petersen5db44862012-09-18 12:19:32 -04001647 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
Martin K. Petersen26e85fc2012-09-18 12:19:31 -04001648 if (!result) {
1649 good_bytes = blk_rq_bytes(req);
1650 scsi_set_resid(SCpnt, 0);
1651 } else {
1652 good_bytes = 0;
1653 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1654 }
1655 }
FUJITA Tomonori6a32a8a2010-07-21 10:29:37 +09001656
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657 if (result) {
1658 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1659 if (sense_valid)
1660 sense_deferred = scsi_sense_is_deferred(&sshdr);
1661 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662#ifdef CONFIG_SCSI_LOGGING
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001663 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 if (sense_valid) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001665 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001666 "sd_done: sb[respc,sk,asc,"
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001667 "ascq]=%x,%x,%x,%x\n",
1668 sshdr.response_code,
1669 sshdr.sense_key, sshdr.asc,
1670 sshdr.ascq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 }
1672#endif
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001673 if (driver_byte(result) != DRIVER_SENSE &&
1674 (!sense_valid || sense_deferred))
1675 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001677 sdkp->medium_access_timed_out = 0;
1678
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001679 switch (sshdr.sense_key) {
1680 case HARDWARE_ERROR:
1681 case MEDIUM_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001682 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001683 break;
1684 case RECOVERED_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001685 good_bytes = scsi_bufflen(SCpnt);
1686 break;
Jamie Wellnitz10dab222008-09-11 21:39:36 -04001687 case NO_SENSE:
1688 /* This indicates a false check condition, so ignore it. An
1689 * unknown amount of data was transferred so treat it as an
1690 * error.
1691 */
1692 scsi_print_sense("sd", SCpnt);
1693 SCpnt->result = 0;
1694 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1695 break;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001696 case ABORTED_COMMAND:
1697 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001698 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001699 break;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001700 case ILLEGAL_REQUEST:
1701 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1702 good_bytes = sd_completed_bytes(SCpnt);
1703 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
Martin K. Petersen5db44862012-09-18 12:19:32 -04001704 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1705 switch (op) {
1706 case UNMAP:
1707 sd_config_discard(sdkp, SD_LBP_DISABLE);
1708 break;
1709 case WRITE_SAME_16:
1710 case WRITE_SAME:
1711 if (unmap)
1712 sd_config_discard(sdkp, SD_LBP_DISABLE);
1713 else {
1714 sdkp->device->no_write_same = 1;
1715 sd_config_write_same(sdkp);
1716
1717 good_bytes = 0;
1718 req->__data_len = blk_rq_bytes(req);
1719 req->cmd_flags |= REQ_QUIET;
1720 }
1721 }
1722 }
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001723 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001724 default:
1725 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001727 out:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001728 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1729 sd_dif_complete(SCpnt, good_bytes);
1730
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001731 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732}
1733
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734/*
1735 * spinup disk - called only in sd_revalidate_disk()
1736 */
1737static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001738sd_spinup_disk(struct scsi_disk *sdkp)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001739{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -04001741 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 int retries, spintime;
1743 unsigned int the_result;
1744 struct scsi_sense_hdr sshdr;
1745 int sense_valid = 0;
1746
1747 spintime = 0;
1748
1749 /* Spin up drives, as required. Only do this at boot time */
1750 /* Spinup needs to be done for module loads too. */
1751 do {
1752 retries = 0;
1753
1754 do {
1755 cmd[0] = TEST_UNIT_READY;
1756 memset((void *) &cmd[1], 0, 9);
1757
James Bottomleyea73a9f2005-08-28 11:33:52 -05001758 the_result = scsi_execute_req(sdkp->device, cmd,
1759 DMA_NONE, NULL, 0,
1760 &sshdr, SD_TIMEOUT,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001761 SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001762
Alan Sternb4d38e32006-10-11 16:48:28 -04001763 /*
1764 * If the drive has indicated to us that it
1765 * doesn't have any media in it, don't bother
1766 * with any more polling.
1767 */
1768 if (media_not_present(sdkp, &sshdr))
1769 return;
1770
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001772 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 retries++;
1774 } while (retries < 3 &&
1775 (!scsi_status_is_good(the_result) ||
1776 ((driver_byte(the_result) & DRIVER_SENSE) &&
1777 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1778
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1780 /* no sense, TUR either succeeded or failed
1781 * with a status error */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001782 if(!spintime && !scsi_status_is_good(the_result)) {
1783 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1784 sd_print_result(sdkp, the_result);
1785 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 break;
1787 }
1788
1789 /*
1790 * The device does not want the automatic start to be issued.
1791 */
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001792 if (sdkp->device->no_start_on_add)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001795 if (sense_valid && sshdr.sense_key == NOT_READY) {
1796 if (sshdr.asc == 4 && sshdr.ascq == 3)
1797 break; /* manual intervention required */
1798 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1799 break; /* standby */
1800 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1801 break; /* unavailable */
1802 /*
1803 * Issue command to spin up drive when not ready
1804 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 if (!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001806 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 cmd[0] = START_STOP;
1808 cmd[1] = 1; /* Return immediately */
1809 memset((void *) &cmd[2], 0, 8);
1810 cmd[4] = 1; /* Start spin cycle */
Stefan Richterd2886ea2008-05-11 00:34:07 +02001811 if (sdkp->device->start_stop_pwr_cond)
1812 cmd[4] |= 1 << 4;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001813 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1814 NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001815 SD_TIMEOUT, SD_MAX_RETRIES,
1816 NULL);
Alan Stern4451e472005-07-12 10:45:17 -04001817 spintime_expire = jiffies + 100 * HZ;
1818 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 /* Wait 1 second for next try */
1821 msleep(1000);
1822 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001823
1824 /*
1825 * Wait for USB flash devices with slow firmware.
1826 * Yes, this sense key/ASC combination shouldn't
1827 * occur here. It's characteristic of these devices.
1828 */
1829 } else if (sense_valid &&
1830 sshdr.sense_key == UNIT_ATTENTION &&
1831 sshdr.asc == 0x28) {
1832 if (!spintime) {
1833 spintime_expire = jiffies + 5 * HZ;
1834 spintime = 1;
1835 }
1836 /* Wait 1 second for next try */
1837 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 } else {
1839 /* we don't understand the sense code, so it's
1840 * probably pointless to loop */
1841 if(!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001842 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1843 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 }
1845 break;
1846 }
1847
Alan Stern4451e472005-07-12 10:45:17 -04001848 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849
1850 if (spintime) {
1851 if (scsi_status_is_good(the_result))
1852 printk("ready\n");
1853 else
1854 printk("not responding...\n");
1855 }
1856}
1857
Martin K. Petersene0597d72008-07-17 04:28:34 -04001858
1859/*
1860 * Determine whether disk supports Data Integrity Field.
1861 */
Martin K. Petersenfe542392012-09-21 12:44:12 -04001862static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04001863{
1864 struct scsi_device *sdp = sdkp->device;
1865 u8 type;
Martin K. Petersenfe542392012-09-21 12:44:12 -04001866 int ret = 0;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001867
1868 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
Martin K. Petersenfe542392012-09-21 12:44:12 -04001869 return ret;
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001870
1871 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1872
Martin K. Petersenfe542392012-09-21 12:44:12 -04001873 if (type > SD_DIF_TYPE3_PROTECTION)
1874 ret = -ENODEV;
1875 else if (scsi_host_dif_capable(sdp->host, type))
1876 ret = 1;
1877
1878 if (sdkp->first_scan || type != sdkp->protection_type)
1879 switch (ret) {
1880 case -ENODEV:
1881 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1882 " protection type %u. Disabling disk!\n",
1883 type);
1884 break;
1885 case 1:
1886 sd_printk(KERN_NOTICE, sdkp,
1887 "Enabling DIF Type %u protection\n", type);
1888 break;
1889 case 0:
1890 sd_printk(KERN_NOTICE, sdkp,
1891 "Disabling DIF Type %u protection\n", type);
1892 break;
1893 }
Martin K. Petersene0597d72008-07-17 04:28:34 -04001894
Martin K. Petersenbe922f42008-09-19 18:47:20 -04001895 sdkp->protection_type = type;
1896
Martin K. Petersenfe542392012-09-21 12:44:12 -04001897 return ret;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001898}
1899
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001900static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1901 struct scsi_sense_hdr *sshdr, int sense_valid,
1902 int the_result)
1903{
1904 sd_print_result(sdkp, the_result);
1905 if (driver_byte(the_result) & DRIVER_SENSE)
1906 sd_print_sense_hdr(sdkp, sshdr);
1907 else
1908 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1909
1910 /*
1911 * Set dirty bit for removable devices if not ready -
1912 * sometimes drives will not report this properly.
1913 */
1914 if (sdp->removable &&
1915 sense_valid && sshdr->sense_key == NOT_READY)
Tejun Heo2bae0092010-12-18 18:42:23 +01001916 set_media_not_present(sdkp);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001917
1918 /*
1919 * We used to set media_present to 0 here to indicate no media
1920 * in the drive, but some drives fail read capacity even with
1921 * media present, so we can't do that.
1922 */
1923 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1924}
1925
1926#define RC16_LEN 32
1927#if RC16_LEN > SD_BUF_SIZE
1928#error RC16_LEN must not be more than SD_BUF_SIZE
1929#endif
1930
James Bottomley3233ac12010-04-01 10:30:01 -04001931#define READ_CAPACITY_RETRIES_ON_RESET 10
1932
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001933static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1934 unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001935{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937 struct scsi_sense_hdr sshdr;
1938 int sense_valid = 0;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001939 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04001940 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001941 unsigned int alignment;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001942 unsigned long long lba;
1943 unsigned sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944
Hans de Goede5ce524b2010-10-01 14:20:10 -07001945 if (sdp->no_read_capacity_16)
1946 return -EINVAL;
1947
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 do {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001949 memset(cmd, 0, 16);
1950 cmd[0] = SERVICE_ACTION_IN;
1951 cmd[1] = SAI_READ_CAPACITY_16;
1952 cmd[13] = RC16_LEN;
1953 memset(buffer, 0, RC16_LEN);
1954
James Bottomleyea73a9f2005-08-28 11:33:52 -05001955 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001956 buffer, RC16_LEN, &sshdr,
1957 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958
James Bottomleyea73a9f2005-08-28 11:33:52 -05001959 if (media_not_present(sdkp, &sshdr))
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001960 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961
Matthew Wilcox2b301302009-03-12 14:20:30 -04001962 if (the_result) {
James Bottomleyea73a9f2005-08-28 11:33:52 -05001963 sense_valid = scsi_sense_valid(&sshdr);
Matthew Wilcox2b301302009-03-12 14:20:30 -04001964 if (sense_valid &&
1965 sshdr.sense_key == ILLEGAL_REQUEST &&
1966 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1967 sshdr.ascq == 0x00)
1968 /* Invalid Command Operation Code or
1969 * Invalid Field in CDB, just retry
1970 * silently with RC10 */
1971 return -EINVAL;
James Bottomley3233ac12010-04-01 10:30:01 -04001972 if (sense_valid &&
1973 sshdr.sense_key == UNIT_ATTENTION &&
1974 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1975 /* Device reset might occur several times,
1976 * give it one more chance */
1977 if (--reset_retries > 0)
1978 continue;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001979 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 retries--;
1981
1982 } while (the_result && retries);
1983
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001984 if (the_result) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001985 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001986 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1987 return -EINVAL;
1988 }
Martin K. Petersene73aec82007-02-27 22:40:55 -05001989
Dave Hansen8f76d152009-04-21 16:43:27 -07001990 sector_size = get_unaligned_be32(&buffer[8]);
1991 lba = get_unaligned_be64(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001992
Martin K. Petersenfe542392012-09-21 12:44:12 -04001993 if (sd_read_protection_type(sdkp, buffer) < 0) {
1994 sdkp->capacity = 0;
1995 return -ENODEV;
1996 }
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001997
1998 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1999 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2000 "kernel compiled with support for large block "
2001 "devices.\n");
2002 sdkp->capacity = 0;
2003 return -EOVERFLOW;
2004 }
2005
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002006 /* Logical blocks per physical block exponent */
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002007 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002008
2009 /* Lowest aligned logical block */
2010 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2011 blk_queue_alignment_offset(sdp->request_queue, alignment);
2012 if (alignment && sdkp->first_scan)
2013 sd_printk(KERN_NOTICE, sdkp,
2014 "physical block alignment offset: %u\n", alignment);
2015
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002016 if (buffer[14] & 0x80) { /* LBPME */
2017 sdkp->lbpme = 1;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002018
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002019 if (buffer[14] & 0x40) /* LBPRZ */
2020 sdkp->lbprz = 1;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002021
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002022 sd_config_discard(sdkp, SD_LBP_WS16);
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002023 }
2024
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002025 sdkp->capacity = lba + 1;
2026 return sector_size;
2027}
2028
2029static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2030 unsigned char *buffer)
2031{
2032 unsigned char cmd[16];
2033 struct scsi_sense_hdr sshdr;
2034 int sense_valid = 0;
2035 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04002036 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002037 sector_t lba;
2038 unsigned sector_size;
2039
2040 do {
2041 cmd[0] = READ_CAPACITY;
2042 memset(&cmd[1], 0, 9);
2043 memset(buffer, 0, 8);
2044
2045 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2046 buffer, 8, &sshdr,
2047 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2048
2049 if (media_not_present(sdkp, &sshdr))
2050 return -ENODEV;
2051
James Bottomley3233ac12010-04-01 10:30:01 -04002052 if (the_result) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002053 sense_valid = scsi_sense_valid(&sshdr);
James Bottomley3233ac12010-04-01 10:30:01 -04002054 if (sense_valid &&
2055 sshdr.sense_key == UNIT_ATTENTION &&
2056 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2057 /* Device reset might occur several times,
2058 * give it one more chance */
2059 if (--reset_retries > 0)
2060 continue;
2061 }
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002062 retries--;
2063
2064 } while (the_result && retries);
2065
2066 if (the_result) {
2067 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2068 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2069 return -EINVAL;
2070 }
2071
Dave Hansen8f76d152009-04-21 16:43:27 -07002072 sector_size = get_unaligned_be32(&buffer[4]);
2073 lba = get_unaligned_be32(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002074
Hans de Goede5ce524b2010-10-01 14:20:10 -07002075 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2076 /* Some buggy (usb cardreader) devices return an lba of
2077 0xffffffff when the want to report a size of 0 (with
2078 which they really mean no media is present) */
2079 sdkp->capacity = 0;
Linus Torvalds5cc10352010-10-22 20:30:48 -07002080 sdkp->physical_block_size = sector_size;
Hans de Goede5ce524b2010-10-01 14:20:10 -07002081 return sector_size;
2082 }
2083
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002084 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2085 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2086 "kernel compiled with support for large block "
2087 "devices.\n");
2088 sdkp->capacity = 0;
2089 return -EOVERFLOW;
2090 }
2091
2092 sdkp->capacity = lba + 1;
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002093 sdkp->physical_block_size = sector_size;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002094 return sector_size;
2095}
2096
Matthew Wilcox2b301302009-03-12 14:20:30 -04002097static int sd_try_rc16_first(struct scsi_device *sdp)
2098{
Hannes Reineckef87146b2010-03-29 09:29:24 +02002099 if (sdp->host->max_cmd_len < 16)
2100 return 0;
Alan Stern6a0bdff2012-06-20 16:04:19 -04002101 if (sdp->try_rc_10_first)
2102 return 0;
Matthew Wilcox2b301302009-03-12 14:20:30 -04002103 if (sdp->scsi_level > SCSI_SPC_2)
2104 return 1;
2105 if (scsi_device_protection(sdp))
2106 return 1;
2107 return 0;
2108}
2109
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002110/*
2111 * read disk capacity
2112 */
2113static void
2114sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2115{
2116 int sector_size;
2117 struct scsi_device *sdp = sdkp->device;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002118 sector_t old_capacity = sdkp->capacity;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002119
Matthew Wilcox2b301302009-03-12 14:20:30 -04002120 if (sd_try_rc16_first(sdp)) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002121 sector_size = read_capacity_16(sdkp, sdp, buffer);
2122 if (sector_size == -EOVERFLOW)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123 goto got_data;
Matthew Wilcox2b301302009-03-12 14:20:30 -04002124 if (sector_size == -ENODEV)
2125 return;
2126 if (sector_size < 0)
2127 sector_size = read_capacity_10(sdkp, sdp, buffer);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002128 if (sector_size < 0)
2129 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130 } else {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002131 sector_size = read_capacity_10(sdkp, sdp, buffer);
2132 if (sector_size == -EOVERFLOW)
2133 goto got_data;
2134 if (sector_size < 0)
2135 return;
2136 if ((sizeof(sdkp->capacity) > 4) &&
2137 (sdkp->capacity > 0xffffffffULL)) {
2138 int old_sector_size = sector_size;
2139 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2140 "Trying to use READ CAPACITY(16).\n");
2141 sector_size = read_capacity_16(sdkp, sdp, buffer);
2142 if (sector_size < 0) {
2143 sd_printk(KERN_NOTICE, sdkp,
2144 "Using 0xffffffff as device size\n");
2145 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2146 sector_size = old_sector_size;
2147 goto got_data;
2148 }
2149 }
2150 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002151
Alan Stern5c211ca2009-02-18 10:54:44 -05002152 /* Some devices are known to return the total number of blocks,
2153 * not the highest block number. Some devices have versions
2154 * which do this and others which do not. Some devices we might
2155 * suspect of doing this but we don't know for certain.
2156 *
2157 * If we know the reported capacity is wrong, decrement it. If
2158 * we can only guess, then assume the number of blocks is even
2159 * (usually true but not always) and err on the side of lowering
2160 * the capacity.
2161 */
2162 if (sdp->fix_capacity ||
2163 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2164 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2165 "from its reported value: %llu\n",
2166 (unsigned long long) sdkp->capacity);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 --sdkp->capacity;
Oliver Neukum61bf54b2007-02-08 09:04:48 +01002168 }
2169
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170got_data:
2171 if (sector_size == 0) {
2172 sector_size = 512;
Martin K. Petersene73aec82007-02-27 22:40:55 -05002173 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2174 "assuming 512.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 }
2176
2177 if (sector_size != 512 &&
2178 sector_size != 1024 &&
2179 sector_size != 2048 &&
2180 sector_size != 4096 &&
2181 sector_size != 256) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002182 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2183 sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184 /*
2185 * The user might want to re-format the drive with
2186 * a supported sectorsize. Once this happens, it
2187 * would be relatively trivial to set the thing up.
2188 * For this reason, we leave the thing in the table.
2189 */
2190 sdkp->capacity = 0;
2191 /*
2192 * set a bogus sector size so the normal read/write
2193 * logic in the block layer will eventually refuse any
2194 * request on this device without tripping over power
2195 * of two sector size assumptions
2196 */
2197 sector_size = 512;
2198 }
Martin K. Petersene1defc42009-05-22 17:17:49 -04002199 blk_queue_logical_block_size(sdp->request_queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200
James Bottomley7404ad3b2008-08-31 10:41:52 -05002201 {
2202 char cap_str_2[10], cap_str_10[10];
H. Peter Anvin520a2c22008-10-14 11:34:20 -07002203 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
James Bottomley7404ad3b2008-08-31 10:41:52 -05002204
2205 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2206 sizeof(cap_str_2));
2207 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2208 sizeof(cap_str_10));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002210 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002211 sd_printk(KERN_NOTICE, sdkp,
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002212 "%llu %d-byte logical blocks: (%s/%s)\n",
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002213 (unsigned long long)sdkp->capacity,
2214 sector_size, cap_str_10, cap_str_2);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002215
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002216 if (sdkp->physical_block_size != sector_size)
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002217 sd_printk(KERN_NOTICE, sdkp,
2218 "%u-byte physical blocks\n",
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002219 sdkp->physical_block_size);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002220 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221 }
2222
Jason J. Herne53ad5702012-11-14 17:03:22 -05002223 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2224
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225 /* Rescale capacity to 512-byte units */
2226 if (sector_size == 4096)
2227 sdkp->capacity <<= 3;
2228 else if (sector_size == 2048)
2229 sdkp->capacity <<= 2;
2230 else if (sector_size == 1024)
2231 sdkp->capacity <<= 1;
2232 else if (sector_size == 256)
2233 sdkp->capacity >>= 1;
2234
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002235 blk_queue_physical_block_size(sdp->request_queue,
2236 sdkp->physical_block_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 sdkp->device->sector_size = sector_size;
2238}
2239
2240/* called with buffer of length 512 */
2241static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05002242sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2243 unsigned char *buffer, int len, struct scsi_mode_data *data,
2244 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245{
James Bottomleyea73a9f2005-08-28 11:33:52 -05002246 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05002247 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05002248 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249}
2250
2251/*
2252 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06002253 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254 */
2255static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05002256sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05002257{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05002259 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 struct scsi_mode_data data;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002261 int old_wp = sdkp->write_prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262
2263 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05002264 if (sdp->skip_ms_page_3f) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002265 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266 return;
2267 }
2268
James Bottomleyea73a9f2005-08-28 11:33:52 -05002269 if (sdp->use_192_bytes_for_3f) {
2270 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271 } else {
2272 /*
2273 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2274 * We have to start carefully: some devices hang if we ask
2275 * for more than is available.
2276 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05002277 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278
2279 /*
2280 * Second attempt: ask for page 0 When only page 0 is
2281 * implemented, a request for page 3F may return Sense Key
2282 * 5: Illegal Request, Sense Code 24: Invalid field in
2283 * CDB.
2284 */
2285 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05002286 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287
2288 /*
2289 * Third attempt: ask 255 bytes, as we did earlier.
2290 */
2291 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05002292 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2293 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 }
2295
2296 if (!scsi_status_is_good(res)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002297 sd_printk(KERN_WARNING, sdkp,
2298 "Test WP failed, assume Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299 } else {
2300 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2301 set_disk_ro(sdkp->disk, sdkp->write_prot);
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002302 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2303 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2304 sdkp->write_prot ? "on" : "off");
2305 sd_printk(KERN_DEBUG, sdkp,
2306 "Mode Sense: %02x %02x %02x %02x\n",
2307 buffer[0], buffer[1], buffer[2], buffer[3]);
2308 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 }
2310}
2311
2312/*
2313 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06002314 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 */
2316static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05002317sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01002318{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05002320 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321
Al Viro 631e8a12005-05-16 01:59:55 +01002322 int dbd;
2323 int modepage;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002324 int first_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325 struct scsi_mode_data data;
2326 struct scsi_sense_hdr sshdr;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002327 int old_wce = sdkp->WCE;
2328 int old_rcd = sdkp->RCD;
2329 int old_dpofua = sdkp->DPOFUA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330
James Bottomley39c60a02013-04-24 14:02:53 -07002331
2332 if (sdkp->cache_override)
2333 return;
2334
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002335 first_len = 4;
2336 if (sdp->skip_ms_page_8) {
2337 if (sdp->type == TYPE_RBC)
2338 goto defaults;
2339 else {
2340 if (sdp->skip_ms_page_3f)
2341 goto defaults;
2342 modepage = 0x3F;
2343 if (sdp->use_192_bytes_for_3f)
2344 first_len = 192;
2345 dbd = 0;
2346 }
2347 } else if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01002348 modepage = 6;
2349 dbd = 8;
2350 } else {
2351 modepage = 8;
2352 dbd = 0;
2353 }
2354
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 /* cautiously ask */
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002356 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2357 &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358
2359 if (!scsi_status_is_good(res))
2360 goto bad_sense;
2361
Al Viro6d73c852006-02-23 02:03:16 +01002362 if (!data.header_length) {
2363 modepage = 6;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002364 first_len = 0;
Martin K. Petersene73aec82007-02-27 22:40:55 -05002365 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
Al Viro6d73c852006-02-23 02:03:16 +01002366 }
2367
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368 /* that went OK, now ask for the proper length */
2369 len = data.length;
2370
2371 /*
2372 * We're only interested in the first three bytes, actually.
2373 * But the data cache page is defined for the first 20.
2374 */
2375 if (len < 3)
2376 goto bad_sense;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002377 else if (len > SD_BUF_SIZE) {
2378 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2379 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2380 len = SD_BUF_SIZE;
2381 }
2382 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2383 len = 192;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384
2385 /* Get the data */
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002386 if (len > first_len)
2387 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2388 &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389
2390 if (scsi_status_is_good(res)) {
Al Viro 631e8a12005-05-16 01:59:55 +01002391 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002393 while (offset < len) {
2394 u8 page_code = buffer[offset] & 0x3F;
2395 u8 spf = buffer[offset] & 0x40;
2396
2397 if (page_code == 8 || page_code == 6) {
2398 /* We're interested only in the first 3 bytes.
2399 */
2400 if (len - offset <= 2) {
2401 sd_printk(KERN_ERR, sdkp, "Incomplete "
2402 "mode parameter data\n");
2403 goto defaults;
2404 } else {
2405 modepage = page_code;
2406 goto Page_found;
2407 }
2408 } else {
2409 /* Go to the next page */
2410 if (spf && len - offset > 3)
2411 offset += 4 + (buffer[offset+2] << 8) +
2412 buffer[offset+3];
2413 else if (!spf && len - offset > 1)
2414 offset += 2 + buffer[offset+1];
2415 else {
2416 sd_printk(KERN_ERR, sdkp, "Incomplete "
2417 "mode parameter data\n");
2418 goto defaults;
2419 }
2420 }
Al Viro48970802006-02-26 08:34:10 -06002421 }
2422
Alan Stern984f1732013-09-06 11:49:51 -04002423 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2424 goto defaults;
2425
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002426 Page_found:
Al Viro 631e8a12005-05-16 01:59:55 +01002427 if (modepage == 8) {
2428 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2429 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2430 } else {
2431 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2432 sdkp->RCD = 0;
2433 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434
Tejun Heo007365a2006-01-06 09:53:52 +01002435 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2436 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002437 sd_printk(KERN_NOTICE, sdkp,
2438 "Uses READ/WRITE(6), disabling FUA\n");
Tejun Heo007365a2006-01-06 09:53:52 +01002439 sdkp->DPOFUA = 0;
2440 }
2441
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002442 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2443 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2444 sd_printk(KERN_NOTICE, sdkp,
2445 "Write cache: %s, read cache: %s, %s\n",
2446 sdkp->WCE ? "enabled" : "disabled",
2447 sdkp->RCD ? "disabled" : "enabled",
2448 sdkp->DPOFUA ? "supports DPO and FUA"
2449 : "doesn't support DPO or FUA");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002450
2451 return;
2452 }
2453
2454bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05002455 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002456 sshdr.sense_key == ILLEGAL_REQUEST &&
2457 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
Martin K. Petersene73aec82007-02-27 22:40:55 -05002458 /* Invalid field in CDB */
2459 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05002461 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462
2463defaults:
Namjae Jeonb81478d2012-07-07 23:05:08 -04002464 if (sdp->wce_default_on) {
2465 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2466 sdkp->WCE = 1;
2467 } else {
2468 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2469 sdkp->WCE = 0;
2470 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002471 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06002472 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473}
2474
Martin K. Petersene0597d72008-07-17 04:28:34 -04002475/*
2476 * The ATO bit indicates whether the DIF application tag is available
2477 * for use by the operating system.
2478 */
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07002479static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04002480{
2481 int res, offset;
2482 struct scsi_device *sdp = sdkp->device;
2483 struct scsi_mode_data data;
2484 struct scsi_sense_hdr sshdr;
2485
2486 if (sdp->type != TYPE_DISK)
2487 return;
2488
2489 if (sdkp->protection_type == 0)
2490 return;
2491
2492 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2493 SD_MAX_RETRIES, &data, &sshdr);
2494
2495 if (!scsi_status_is_good(res) || !data.header_length ||
2496 data.length < 6) {
2497 sd_printk(KERN_WARNING, sdkp,
2498 "getting Control mode page failed, assume no ATO\n");
2499
2500 if (scsi_sense_valid(&sshdr))
2501 sd_print_sense_hdr(sdkp, &sshdr);
2502
2503 return;
2504 }
2505
2506 offset = data.header_length + data.block_descriptor_length;
2507
2508 if ((buffer[offset] & 0x3f) != 0x0a) {
2509 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2510 return;
2511 }
2512
2513 if ((buffer[offset + 5] & 0x80) == 0)
2514 return;
2515
2516 sdkp->ATO = 1;
2517
2518 return;
2519}
2520
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521/**
Martin K. Petersend11b6912009-05-23 11:43:39 -04002522 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2523 * @disk: disk to query
2524 */
2525static void sd_read_block_limits(struct scsi_disk *sdkp)
2526{
2527 unsigned int sector_sz = sdkp->device->sector_size;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002528 const int vpd_len = 64;
James Bottomleye3deec02009-11-03 12:33:07 -06002529 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersend11b6912009-05-23 11:43:39 -04002530
James Bottomleye3deec02009-11-03 12:33:07 -06002531 if (!buffer ||
2532 /* Block Limits VPD */
2533 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2534 goto out;
Martin K. Petersend11b6912009-05-23 11:43:39 -04002535
2536 blk_queue_io_min(sdkp->disk->queue,
2537 get_unaligned_be16(&buffer[6]) * sector_sz);
2538 blk_queue_io_opt(sdkp->disk->queue,
2539 get_unaligned_be32(&buffer[12]) * sector_sz);
2540
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002541 if (buffer[3] == 0x3c) {
2542 unsigned int lba_count, desc_count;
2543
Martin K. Petersen5db44862012-09-18 12:19:32 -04002544 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002545
2546 if (!sdkp->lbpme)
2547 goto out;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002548
2549 lba_count = get_unaligned_be32(&buffer[20]);
2550 desc_count = get_unaligned_be32(&buffer[24]);
2551
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002552 if (lba_count && desc_count)
2553 sdkp->max_unmap_blocks = lba_count;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002554
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002555 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002556
2557 if (buffer[32] & 0x80)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002558 sdkp->unmap_alignment =
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002559 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002560
2561 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2562
2563 if (sdkp->max_unmap_blocks)
2564 sd_config_discard(sdkp, SD_LBP_UNMAP);
2565 else
2566 sd_config_discard(sdkp, SD_LBP_WS16);
2567
2568 } else { /* LBP VPD page tells us what to use */
2569
2570 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2571 sd_config_discard(sdkp, SD_LBP_UNMAP);
2572 else if (sdkp->lbpws)
2573 sd_config_discard(sdkp, SD_LBP_WS16);
2574 else if (sdkp->lbpws10)
2575 sd_config_discard(sdkp, SD_LBP_WS10);
2576 else
2577 sd_config_discard(sdkp, SD_LBP_DISABLE);
2578 }
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002579 }
2580
James Bottomleye3deec02009-11-03 12:33:07 -06002581 out:
Martin K. Petersend11b6912009-05-23 11:43:39 -04002582 kfree(buffer);
2583}
2584
2585/**
Martin K. Petersen3821d762009-05-23 11:43:38 -04002586 * sd_read_block_characteristics - Query block dev. characteristics
2587 * @disk: disk to query
2588 */
2589static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2590{
James Bottomleye3deec02009-11-03 12:33:07 -06002591 unsigned char *buffer;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002592 u16 rot;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002593 const int vpd_len = 64;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002594
James Bottomleye3deec02009-11-03 12:33:07 -06002595 buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersen3821d762009-05-23 11:43:38 -04002596
James Bottomleye3deec02009-11-03 12:33:07 -06002597 if (!buffer ||
2598 /* Block Device Characteristics VPD */
2599 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2600 goto out;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002601
2602 rot = get_unaligned_be16(&buffer[4]);
2603
2604 if (rot == 1)
2605 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2606
James Bottomleye3deec02009-11-03 12:33:07 -06002607 out:
Martin K. Petersen3821d762009-05-23 11:43:38 -04002608 kfree(buffer);
2609}
2610
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002611/**
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002612 * sd_read_block_provisioning - Query provisioning VPD page
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002613 * @disk: disk to query
2614 */
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002615static void sd_read_block_provisioning(struct scsi_disk *sdkp)
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002616{
2617 unsigned char *buffer;
2618 const int vpd_len = 8;
2619
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002620 if (sdkp->lbpme == 0)
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002621 return;
2622
2623 buffer = kmalloc(vpd_len, GFP_KERNEL);
2624
2625 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2626 goto out;
2627
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002628 sdkp->lbpvpd = 1;
2629 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2630 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2631 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002632
2633 out:
2634 kfree(buffer);
2635}
2636
Martin K. Petersen5db44862012-09-18 12:19:32 -04002637static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2638{
Martin K. Petersen66c28f92013-06-06 22:15:55 -04002639 struct scsi_device *sdev = sdkp->device;
2640
2641 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2642 sdev->no_report_opcodes = 1;
2643
2644 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2645 * CODES is unsupported and the device has an ATA
2646 * Information VPD page (SAT).
2647 */
2648 if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE))
2649 sdev->no_write_same = 1;
2650 }
2651
2652 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
Martin K. Petersen5db44862012-09-18 12:19:32 -04002653 sdkp->ws16 = 1;
Martin K. Petersen66c28f92013-06-06 22:15:55 -04002654
2655 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2656 sdkp->ws10 = 1;
Martin K. Petersen5db44862012-09-18 12:19:32 -04002657}
2658
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002659static int sd_try_extended_inquiry(struct scsi_device *sdp)
2660{
2661 /*
2662 * Although VPD inquiries can go to SCSI-2 type devices,
2663 * some USB ones crash on receiving them, and the pages
2664 * we currently ask for are for SPC-3 and beyond
2665 */
Alan Stern09b6b512012-01-10 13:43:30 -05002666 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002667 return 1;
2668 return 0;
2669}
2670
Martin K. Petersen3821d762009-05-23 11:43:38 -04002671/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672 * sd_revalidate_disk - called the first time a new disk is seen,
2673 * performs disk spin up, read_capacity, etc.
2674 * @disk: struct gendisk we care about
2675 **/
2676static int sd_revalidate_disk(struct gendisk *disk)
2677{
2678 struct scsi_disk *sdkp = scsi_disk(disk);
2679 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002680 unsigned char *buffer;
Tejun Heo4913efe2010-09-03 11:56:16 +02002681 unsigned flush = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05002683 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2684 "sd_revalidate_disk\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002685
2686 /*
2687 * If the device is offline, don't try and read capacity or any
2688 * of the other niceties.
2689 */
2690 if (!scsi_device_online(sdp))
2691 goto out;
2692
Bernhard Wallea6123f12007-05-21 17:15:26 +02002693 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694 if (!buffer) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002695 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2696 "allocation failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05002697 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698 }
2699
Martin K. Petersene73aec82007-02-27 22:40:55 -05002700 sd_spinup_disk(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701
2702 /*
2703 * Without media there is no reason to ask; moreover, some devices
2704 * react badly if we do.
2705 */
2706 if (sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002707 sd_read_capacity(sdkp, buffer);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002708
2709 if (sd_try_extended_inquiry(sdp)) {
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002710 sd_read_block_provisioning(sdkp);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002711 sd_read_block_limits(sdkp);
2712 sd_read_block_characteristics(sdkp);
2713 }
2714
Martin K. Petersene73aec82007-02-27 22:40:55 -05002715 sd_read_write_protect_flag(sdkp, buffer);
2716 sd_read_cache_type(sdkp, buffer);
Martin K. Petersene0597d72008-07-17 04:28:34 -04002717 sd_read_app_tag_own(sdkp, buffer);
Martin K. Petersen5db44862012-09-18 12:19:32 -04002718 sd_read_write_same(sdkp, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719 }
Tejun Heo461d4e92006-01-06 09:52:55 +01002720
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002721 sdkp->first_scan = 0;
2722
Tejun Heo461d4e92006-01-06 09:52:55 +01002723 /*
2724 * We now have all cache related info, determine how we deal
Tejun Heo4913efe2010-09-03 11:56:16 +02002725 * with flush requests.
Tejun Heo461d4e92006-01-06 09:52:55 +01002726 */
Tejun Heo4913efe2010-09-03 11:56:16 +02002727 if (sdkp->WCE) {
2728 flush |= REQ_FLUSH;
2729 if (sdkp->DPOFUA)
2730 flush |= REQ_FUA;
2731 }
Tejun Heo461d4e92006-01-06 09:52:55 +01002732
Tejun Heo4913efe2010-09-03 11:56:16 +02002733 blk_queue_flush(sdkp->disk->queue, flush);
Tejun Heo461d4e92006-01-06 09:52:55 +01002734
Linus Torvalds1da177e2005-04-16 15:20:36 -07002735 set_capacity(disk, sdkp->capacity);
Martin K. Petersen5db44862012-09-18 12:19:32 -04002736 sd_config_write_same(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002737 kfree(buffer);
2738
Linus Torvalds1da177e2005-04-16 15:20:36 -07002739 out:
2740 return 0;
2741}
2742
2743/**
Tejun Heo72ec24b2010-05-15 20:09:32 +02002744 * sd_unlock_native_capacity - unlock native capacity
2745 * @disk: struct gendisk to set capacity for
2746 *
2747 * Block layer calls this function if it detects that partitions
2748 * on @disk reach beyond the end of the device. If the SCSI host
2749 * implements ->unlock_native_capacity() method, it's invoked to
2750 * give it a chance to adjust the device capacity.
2751 *
2752 * CONTEXT:
2753 * Defined by block layer. Might sleep.
2754 */
2755static void sd_unlock_native_capacity(struct gendisk *disk)
2756{
2757 struct scsi_device *sdev = scsi_disk(disk)->device;
2758
2759 if (sdev->host->hostt->unlock_native_capacity)
2760 sdev->host->hostt->unlock_native_capacity(sdev);
2761}
2762
2763/**
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002764 * sd_format_disk_name - format disk name
2765 * @prefix: name prefix - ie. "sd" for SCSI disks
2766 * @index: index of the disk to format name for
2767 * @buf: output buffer
2768 * @buflen: length of the output buffer
2769 *
2770 * SCSI disk names starts at sda. The 26th device is sdz and the
2771 * 27th is sdaa. The last one for two lettered suffix is sdzz
2772 * which is followed by sdaaa.
2773 *
2774 * This is basically 26 base counting with one extra 'nil' entry
Daniel Mack3ad2f3f2010-02-03 08:01:28 +08002775 * at the beginning from the second digit on and can be
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002776 * determined using similar method as 26 base conversion with the
2777 * index shifted -1 after each digit is computed.
2778 *
2779 * CONTEXT:
2780 * Don't care.
2781 *
2782 * RETURNS:
2783 * 0 on success, -errno on failure.
2784 */
2785static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2786{
2787 const int base = 'z' - 'a' + 1;
2788 char *begin = buf + strlen(prefix);
2789 char *end = buf + buflen;
2790 char *p;
2791 int unit;
2792
2793 p = end - 1;
2794 *p = '\0';
2795 unit = base;
2796 do {
2797 if (p == begin)
2798 return -EINVAL;
2799 *--p = 'a' + (index % unit);
2800 index = (index / unit) - 1;
2801 } while (index >= 0);
2802
2803 memmove(begin, p, end - p);
2804 memcpy(buf, prefix, strlen(prefix));
2805
2806 return 0;
2807}
2808
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002809/*
2810 * The asynchronous part of sd_probe
2811 */
2812static void sd_probe_async(void *data, async_cookie_t cookie)
2813{
2814 struct scsi_disk *sdkp = data;
2815 struct scsi_device *sdp;
2816 struct gendisk *gd;
2817 u32 index;
2818 struct device *dev;
2819
2820 sdp = sdkp->device;
2821 gd = sdkp->disk;
2822 index = sdkp->index;
2823 dev = &sdp->sdev_gendev;
2824
Michael Reed1a03ae02010-09-20 11:20:22 -05002825 gd->major = sd_major((index & 0xf0) >> 4);
2826 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2827 gd->minors = SD_MINORS;
2828
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002829 gd->fops = &sd_fops;
2830 gd->private_data = &sdkp->driver;
2831 gd->queue = sdkp->device->request_queue;
2832
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002833 /* defaults, until the device tells us otherwise */
2834 sdp->sector_size = 512;
2835 sdkp->capacity = 0;
2836 sdkp->media_present = 1;
2837 sdkp->write_prot = 0;
James Bottomley39c60a02013-04-24 14:02:53 -07002838 sdkp->cache_override = 0;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002839 sdkp->WCE = 0;
2840 sdkp->RCD = 0;
2841 sdkp->ATO = 0;
2842 sdkp->first_scan = 1;
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05002843 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002844
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002845 sd_revalidate_disk(gd);
2846
2847 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
FUJITA Tomonorif1126e92010-07-01 19:49:18 +09002848 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002849
2850 gd->driverfs_dev = &sdp->sdev_gendev;
NeilBrown97fedbb2010-03-16 08:55:32 +01002851 gd->flags = GENHD_FL_EXT_DEVT;
Tejun Heo2bae0092010-12-18 18:42:23 +01002852 if (sdp->removable) {
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002853 gd->flags |= GENHD_FL_REMOVABLE;
Tejun Heo2bae0092010-12-18 18:42:23 +01002854 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2855 }
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002856
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002857 add_disk(gd);
Martin K. Petersenfe542392012-09-21 12:44:12 -04002858 if (sdkp->capacity)
2859 sd_dif_config_host(sdkp);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002860
Martin K. Petersen3821d762009-05-23 11:43:38 -04002861 sd_revalidate_disk(gd);
2862
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002863 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2864 sdp->removable ? "removable " : "");
Lin Ming6df339a2013-03-23 11:42:28 +08002865 blk_pm_runtime_init(sdp->request_queue, dev);
Alan Stern478a8a02010-06-16 14:52:17 -04002866 scsi_autopm_put_device(sdp);
James Bottomleyea038f62009-08-21 09:47:54 -06002867 put_device(&sdkp->dev);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002868}
2869
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002870/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871 * sd_probe - called during driver initialization and whenever a
2872 * new scsi device is attached to the system. It is called once
2873 * for each scsi device (not just disks) present.
2874 * @dev: pointer to device object
2875 *
2876 * Returns 0 if successful (or not interested in this scsi device
2877 * (e.g. scanner)); 1 when there is an error.
2878 *
2879 * Note: this function is invoked from the scsi mid-level.
2880 * This function sets up the mapping between a given
2881 * <host,channel,id,lun> (found in sdp) and new device name
2882 * (e.g. /dev/sda). More precisely it is the block device major
2883 * and minor number that is chosen here.
2884 *
Petr Uzel2db93ce2012-02-24 16:56:54 +01002885 * Assume sd_probe is not re-entrant (for time being)
2886 * Also think about sd_probe() and sd_remove() running coincidentally.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002887 **/
2888static int sd_probe(struct device *dev)
2889{
2890 struct scsi_device *sdp = to_scsi_device(dev);
2891 struct scsi_disk *sdkp;
2892 struct gendisk *gd;
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07002893 int index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894 int error;
2895
2896 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01002897 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898 goto out;
2899
James Bottomley9ccfc752005-10-02 11:45:08 -05002900 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
Petr Uzel2db93ce2012-02-24 16:56:54 +01002901 "sd_probe\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902
2903 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05002904 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 if (!sdkp)
2906 goto out;
2907
Tejun Heo689d6fa2008-08-25 19:56:16 +09002908 gd = alloc_disk(SD_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909 if (!gd)
2910 goto out_free;
2911
Tejun Heof27bac22008-07-14 14:59:30 +09002912 do {
2913 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2914 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002915
Tejun Heo4034cc62009-02-21 11:04:45 +09002916 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002917 error = ida_get_new(&sd_index_ida, &index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002918 spin_unlock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002919 } while (error == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002920
Dave Kleikamp21208ae2011-10-19 11:49:04 -05002921 if (error) {
2922 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 goto out_put;
Michael Reed1a03ae02010-09-20 11:20:22 -05002924 }
2925
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002926 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
Dave Kleikamp21208ae2011-10-19 11:49:04 -05002927 if (error) {
2928 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
Tejun Heof27bac22008-07-14 14:59:30 +09002929 goto out_free_index;
Dave Kleikamp21208ae2011-10-19 11:49:04 -05002930 }
Tejun Heof27bac22008-07-14 14:59:30 +09002931
Linus Torvalds1da177e2005-04-16 15:20:36 -07002932 sdkp->device = sdp;
2933 sdkp->driver = &sd_template;
2934 sdkp->disk = gd;
2935 sdkp->index = index;
Arnd Bergmann409f3492010-07-07 16:51:29 +02002936 atomic_set(&sdkp->openers, 0);
Josh Hunt9e1a1532012-06-09 07:03:39 -07002937 atomic_set(&sdkp->device->ioerr_cnt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002938
James Bottomley601e7632009-05-26 20:35:48 +00002939 if (!sdp->request_queue->rq_timeout) {
2940 if (sdp->type != TYPE_MOD)
2941 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2942 else
2943 blk_queue_rq_timeout(sdp->request_queue,
2944 SD_MOD_TIMEOUT);
2945 }
2946
2947 device_initialize(&sdkp->dev);
Alan Stern478a8a02010-06-16 14:52:17 -04002948 sdkp->dev.parent = dev;
James Bottomley601e7632009-05-26 20:35:48 +00002949 sdkp->dev.class = &sd_disk_class;
Kees Cook02aa2a32013-07-03 15:04:56 -07002950 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
James Bottomley601e7632009-05-26 20:35:48 +00002951
2952 if (device_add(&sdkp->dev))
2953 goto out_free_index;
2954
Alan Stern478a8a02010-06-16 14:52:17 -04002955 get_device(dev);
2956 dev_set_drvdata(dev, sdkp);
James Bottomley601e7632009-05-26 20:35:48 +00002957
James Bottomleyea038f62009-08-21 09:47:54 -06002958 get_device(&sdkp->dev); /* prevent release before async_schedule */
Dan Williamsa7a20d12012-03-22 17:05:11 -07002959 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002960
2961 return 0;
2962
Tejun Heof27bac22008-07-14 14:59:30 +09002963 out_free_index:
Tejun Heo4034cc62009-02-21 11:04:45 +09002964 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002965 ida_remove(&sd_index_ida, index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002966 spin_unlock(&sd_index_lock);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002967 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002968 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002969 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002970 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002971 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 return error;
2973}
2974
2975/**
2976 * sd_remove - called whenever a scsi disk (previously recognized by
2977 * sd_probe) is detached from the system. It is called (potentially
2978 * multiple times) during sd module unload.
2979 * @sdp: pointer to mid level scsi device object
2980 *
2981 * Note: this function is invoked from the scsi mid-level.
2982 * This function potentially frees up a device name (e.g. /dev/sdc)
2983 * that could be re-used by a subsequent sd_probe().
2984 * This function is not called when the built-in sd driver is "exit-ed".
2985 **/
2986static int sd_remove(struct device *dev)
2987{
James Bottomley601e7632009-05-26 20:35:48 +00002988 struct scsi_disk *sdkp;
Hannes Reinecke0761df92013-05-10 11:06:16 +02002989 dev_t devt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002990
James Bottomley601e7632009-05-26 20:35:48 +00002991 sdkp = dev_get_drvdata(dev);
Hannes Reinecke0761df92013-05-10 11:06:16 +02002992 devt = disk_devt(sdkp->disk);
Alan Stern478a8a02010-06-16 14:52:17 -04002993 scsi_autopm_get_device(sdkp->device);
2994
Dan Williamsa7a20d12012-03-22 17:05:11 -07002995 async_synchronize_full_domain(&scsi_sd_probe_domain);
Hannes Reineckeb3912772009-06-18 09:57:18 +02002996 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
FUJITA Tomonori82b6d572010-07-03 08:07:04 -06002997 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01002998 device_del(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002999 del_gendisk(sdkp->disk);
3000 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003001
Hannes Reinecke0761df92013-05-10 11:06:16 +02003002 blk_register_region(devt, SD_MINORS, NULL,
3003 sd_default_probe, NULL, NULL);
3004
Arjan van de Ven0b950672006-01-11 13:16:10 +01003005 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003006 dev_set_drvdata(dev, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01003007 put_device(&sdkp->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01003008 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003009
3010 return 0;
3011}
3012
3013/**
3014 * scsi_disk_release - Called to free the scsi_disk structure
Tony Jonesee959b02008-02-22 00:13:36 +01003015 * @dev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003016 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01003017 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 * called on last put, you should always use the scsi_disk_get()
3019 * scsi_disk_put() helpers which manipulate the semaphore directly
Tony Jonesee959b02008-02-22 00:13:36 +01003020 * and never do a direct put_device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003021 **/
Tony Jonesee959b02008-02-22 00:13:36 +01003022static void scsi_disk_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023{
Tony Jonesee959b02008-02-22 00:13:36 +01003024 struct scsi_disk *sdkp = to_scsi_disk(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003025 struct gendisk *disk = sdkp->disk;
3026
Tejun Heo4034cc62009-02-21 11:04:45 +09003027 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09003028 ida_remove(&sd_index_ida, sdkp->index);
Tejun Heo4034cc62009-02-21 11:04:45 +09003029 spin_unlock(&sd_index_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003030
3031 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003032 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003033 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003034
3035 kfree(sdkp);
3036}
3037
James Bottomleycc5d2c82007-03-20 12:26:03 -05003038static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
Tejun Heoc3c94c52007-03-21 00:13:59 +09003039{
3040 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3041 struct scsi_sense_hdr sshdr;
James Bottomleycc5d2c82007-03-20 12:26:03 -05003042 struct scsi_device *sdp = sdkp->device;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003043 int res;
3044
3045 if (start)
3046 cmd[4] |= 1; /* START */
3047
Stefan Richterd2886ea2008-05-11 00:34:07 +02003048 if (sdp->start_stop_pwr_cond)
3049 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3050
Tejun Heoc3c94c52007-03-21 00:13:59 +09003051 if (!scsi_device_online(sdp))
3052 return -ENODEV;
3053
Lin Ming9b214932013-03-23 11:42:25 +08003054 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3055 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003056 if (res) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05003057 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3058 sd_print_result(sdkp, res);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003059 if (driver_byte(res) & DRIVER_SENSE)
James Bottomleycc5d2c82007-03-20 12:26:03 -05003060 sd_print_sense_hdr(sdkp, &sshdr);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003061 }
3062
3063 return res;
3064}
3065
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066/*
3067 * Send a SYNCHRONIZE CACHE instruction down to the device through
3068 * the normal SCSI command structure. Wait for the command to
3069 * complete.
3070 */
3071static void sd_shutdown(struct device *dev)
3072{
Alan Stern39b7f1e2005-11-04 14:44:41 -05003073 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003074
3075 if (!sdkp)
3076 return; /* this can happen */
3077
Lin Ming54f575882011-12-05 09:20:26 +08003078 if (pm_runtime_suspended(dev))
3079 goto exit;
3080
Alan Stern39b7f1e2005-11-04 14:44:41 -05003081 if (sdkp->WCE) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05003082 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3083 sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003084 }
Tejun Heoc3c94c52007-03-21 00:13:59 +09003085
James Bottomleycc5d2c82007-03-20 12:26:03 -05003086 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3087 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3088 sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003089 }
3090
Lin Ming54f575882011-12-05 09:20:26 +08003091exit:
Alan Stern39b7f1e2005-11-04 14:44:41 -05003092 scsi_disk_put(sdkp);
3093}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003094
Aaron Lu691e3d32012-11-09 15:27:55 +08003095static int sd_suspend(struct device *dev)
Tejun Heoc3c94c52007-03-21 00:13:59 +09003096{
Tejun Heoc3c94c52007-03-21 00:13:59 +09003097 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04003098 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003099
3100 if (!sdkp)
3101 return 0; /* this can happen */
3102
3103 if (sdkp->WCE) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05003104 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
Tejun Heoc3c94c52007-03-21 00:13:59 +09003105 ret = sd_sync_cache(sdkp);
3106 if (ret)
Alan Stern09ff92f2007-05-21 09:55:04 -04003107 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003108 }
3109
Aaron Lu691e3d32012-11-09 15:27:55 +08003110 if (sdkp->device->manage_start_stop) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05003111 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3112 ret = sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003113 }
3114
Alan Stern09ff92f2007-05-21 09:55:04 -04003115done:
3116 scsi_disk_put(sdkp);
3117 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003118}
3119
3120static int sd_resume(struct device *dev)
3121{
Tejun Heoc3c94c52007-03-21 00:13:59 +09003122 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04003123 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003124
James Bottomleycc5d2c82007-03-20 12:26:03 -05003125 if (!sdkp->device->manage_start_stop)
Alan Stern09ff92f2007-05-21 09:55:04 -04003126 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003127
James Bottomleycc5d2c82007-03-20 12:26:03 -05003128 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
Alan Stern09ff92f2007-05-21 09:55:04 -04003129 ret = sd_start_stop_device(sdkp, 1);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003130
Alan Stern09ff92f2007-05-21 09:55:04 -04003131done:
3132 scsi_disk_put(sdkp);
3133 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003134}
3135
Linus Torvalds1da177e2005-04-16 15:20:36 -07003136/**
3137 * init_sd - entry point for this driver (both when built in or when
3138 * a module).
3139 *
3140 * Note: this function registers this driver with the scsi mid-level.
3141 **/
3142static int __init init_sd(void)
3143{
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003144 int majors = 0, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003145
3146 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3147
Hannes Reinecke0761df92013-05-10 11:06:16 +02003148 for (i = 0; i < SD_MAJORS; i++) {
3149 if (register_blkdev(sd_major(i), "sd") != 0)
3150 continue;
3151 majors++;
3152 blk_register_region(sd_major(i), SD_MINORS, NULL,
3153 sd_default_probe, NULL, NULL);
3154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003155
3156 if (!majors)
3157 return -ENODEV;
3158
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003159 err = class_register(&sd_disk_class);
3160 if (err)
3161 goto err_out;
James Bottomley6bdaa1f2006-03-18 14:14:21 -06003162
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003163 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3164 0, 0, NULL);
3165 if (!sd_cdb_cache) {
3166 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3167 goto err_out_class;
3168 }
3169
3170 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3171 if (!sd_cdb_pool) {
3172 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3173 goto err_out_cache;
3174 }
3175
Joel D. Diazafd5e342012-10-10 10:36:11 +02003176 err = scsi_register_driver(&sd_template.gendrv);
3177 if (err)
3178 goto err_out_driver;
3179
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003180 return 0;
3181
Joel D. Diazafd5e342012-10-10 10:36:11 +02003182err_out_driver:
3183 mempool_destroy(sd_cdb_pool);
3184
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003185err_out_cache:
3186 kmem_cache_destroy(sd_cdb_cache);
3187
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003188err_out_class:
3189 class_unregister(&sd_disk_class);
3190err_out:
3191 for (i = 0; i < SD_MAJORS; i++)
3192 unregister_blkdev(sd_major(i), "sd");
3193 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003194}
3195
3196/**
3197 * exit_sd - exit point for this driver (when it is a module).
3198 *
3199 * Note: this function unregisters this driver from the scsi mid-level.
3200 **/
3201static void __exit exit_sd(void)
3202{
3203 int i;
3204
3205 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3206
Joel D. Diazafd5e342012-10-10 10:36:11 +02003207 scsi_unregister_driver(&sd_template.gendrv);
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003208 mempool_destroy(sd_cdb_pool);
3209 kmem_cache_destroy(sd_cdb_cache);
3210
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003211 class_unregister(&sd_disk_class);
3212
Hannes Reinecke0761df92013-05-10 11:06:16 +02003213 for (i = 0; i < SD_MAJORS; i++) {
3214 blk_unregister_region(sd_major(i), SD_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003215 unregister_blkdev(sd_major(i), "sd");
Hannes Reinecke0761df92013-05-10 11:06:16 +02003216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003217}
3218
Linus Torvalds1da177e2005-04-16 15:20:36 -07003219module_init(init_sd);
3220module_exit(exit_sd);
Martin K. Petersene73aec82007-02-27 22:40:55 -05003221
3222static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3223 struct scsi_sense_hdr *sshdr)
3224{
David Miller2e4c3322010-08-31 13:35:31 -07003225 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05003226 scsi_show_sense_hdr(sshdr);
David Miller2e4c3322010-08-31 13:35:31 -07003227 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05003228 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3229}
3230
3231static void sd_print_result(struct scsi_disk *sdkp, int result)
3232{
David Miller2e4c3322010-08-31 13:35:31 -07003233 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05003234 scsi_show_result(result);
3235}
3236