blob: 3d22fc3e3c1a7ba6df90665f59cf10e8d38ef715 [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>
Christoph Hellwig924d55b2015-10-15 14:10:49 +020054#include <linux/pr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <asm/uaccess.h>
Dave Hansen8f76d152009-04-21 16:43:27 -070056#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58#include <scsi/scsi.h>
59#include <scsi/scsi_cmnd.h>
60#include <scsi/scsi_dbg.h>
61#include <scsi/scsi_device.h>
62#include <scsi/scsi_driver.h>
63#include <scsi/scsi_eh.h>
64#include <scsi/scsi_host.h>
65#include <scsi/scsi_ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <scsi/scsicam.h>
67
Martin K. Petersenaa916962008-06-17 12:47:32 -040068#include "sd.h"
Dan Williamsa7a20d12012-03-22 17:05:11 -070069#include "scsi_priv.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include "scsi_logging.h"
71
Rene Hermanf018fa52006-03-08 00:14:20 -080072MODULE_AUTHOR("Eric Youngdale");
73MODULE_DESCRIPTION("SCSI disk (sd) driver");
74MODULE_LICENSE("GPL");
75
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040092MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
93MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
Rene Hermanf018fa52006-03-08 00:14:20 -080095
Tejun Heo870d6652008-08-25 19:47:25 +090096#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
Tejun Heof615b482008-08-25 19:47:24 +090097#define SD_MINORS 16
Tejun Heo870d6652008-08-25 19:47:25 +090098#else
Tejun Heo3e1a7ff2008-08-25 19:56:17 +090099#define SD_MINORS 0
Tejun Heo870d6652008-08-25 19:47:25 +0900100#endif
101
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500102static void sd_config_discard(struct scsi_disk *, unsigned int);
Martin K. Petersen5db44862012-09-18 12:19:32 -0400103static void sd_config_write_same(struct scsi_disk *);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800104static int sd_revalidate_disk(struct gendisk *);
Tejun Heo72ec24b2010-05-15 20:09:32 +0200105static void sd_unlock_native_capacity(struct gendisk *disk);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800106static int sd_probe(struct device *);
107static int sd_remove(struct device *);
108static void sd_shutdown(struct device *);
Oliver Neukum95897912013-09-16 13:28:15 +0200109static int sd_suspend_system(struct device *);
110static int sd_suspend_runtime(struct device *);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800111static int sd_resume(struct device *);
112static void sd_rescan(struct device *);
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +0200113static int sd_init_command(struct scsi_cmnd *SCpnt);
114static void sd_uninit_command(struct scsi_cmnd *SCpnt);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800115static int sd_done(struct scsi_cmnd *);
James Bottomley24510792013-11-11 13:44:53 +0100116static int sd_eh_action(struct scsi_cmnd *, int);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800117static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
Tony Jonesee959b02008-02-22 00:13:36 +0100118static void scsi_disk_release(struct device *cdev);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800119static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
Hannes Reineckeef613292014-10-24 14:27:00 +0200120static void sd_print_result(const struct scsi_disk *, const char *, int);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800121
Tejun Heo4034cc62009-02-21 11:04:45 +0900122static DEFINE_SPINLOCK(sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +0900123static DEFINE_IDA(sd_index_ida);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125/* This semaphore is used to mediate the 0->1 reference get in the
126 * face of object destruction (i.e. we can't allow a get on an
127 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100128static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700130static struct kmem_cache *sd_cdb_cache;
131static mempool_t *sd_cdb_pool;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400132
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600133static const char *sd_cache_types[] = {
134 "write through", "none", "write back",
135 "write back, no read (daft)"
136};
137
Vaughan Caocb2fb682014-06-03 17:37:30 +0800138static void sd_set_flush_flag(struct scsi_disk *sdkp)
139{
140 unsigned flush = 0;
141
142 if (sdkp->WCE) {
143 flush |= REQ_FLUSH;
144 if (sdkp->DPOFUA)
145 flush |= REQ_FUA;
146 }
147
148 blk_queue_flush(sdkp->disk->queue, flush);
149}
150
Tony Jonesee959b02008-02-22 00:13:36 +0100151static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700152cache_type_store(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600154{
155 int i, ct = -1, rcd, wce, sp;
Tony Jonesee959b02008-02-22 00:13:36 +0100156 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600157 struct scsi_device *sdp = sdkp->device;
158 char buffer[64];
159 char *buffer_data;
160 struct scsi_mode_data data;
161 struct scsi_sense_hdr sshdr;
Ben Hutchings2ee3e262013-05-27 19:07:19 +0100162 static const char temp[] = "temporary ";
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600163 int len;
164
165 if (sdp->type != TYPE_DISK)
166 /* no cache control on RBC devices; theoretically they
167 * can do it, but there's probably so many exceptions
168 * it's not worth the risk */
169 return -EINVAL;
170
James Bottomley39c60a02013-04-24 14:02:53 -0700171 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
172 buf += sizeof(temp) - 1;
173 sdkp->cache_override = 1;
174 } else {
175 sdkp->cache_override = 0;
176 }
177
Tobias Klauser6391a112006-06-08 22:23:48 -0700178 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700179 len = strlen(sd_cache_types[i]);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600180 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
181 buf[len] == '\n') {
182 ct = i;
183 break;
184 }
185 }
186 if (ct < 0)
187 return -EINVAL;
188 rcd = ct & 0x01 ? 1 : 0;
Sujit Reddy Thumma2eefd572014-08-11 15:40:37 +0300189 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
James Bottomley39c60a02013-04-24 14:02:53 -0700190
191 if (sdkp->cache_override) {
192 sdkp->WCE = wce;
193 sdkp->RCD = rcd;
Vaughan Caocb2fb682014-06-03 17:37:30 +0800194 sd_set_flush_flag(sdkp);
James Bottomley39c60a02013-04-24 14:02:53 -0700195 return count;
196 }
197
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600198 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
199 SD_MAX_RETRIES, &data, NULL))
200 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800201 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600202 data.block_descriptor_length);
203 buffer_data = buffer + data.header_length +
204 data.block_descriptor_length;
205 buffer_data[2] &= ~0x05;
206 buffer_data[2] |= wce << 2 | rcd;
207 sp = buffer_data[0] & 0x80 ? 1 : 0;
Gabriel Krisman Bertazi2c5d16d2015-10-30 16:04:43 -0200208 buffer_data[0] &= ~0x80;
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600209
210 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
211 SD_MAX_RETRIES, &data, &sshdr)) {
212 if (scsi_sense_valid(&sshdr))
Martin K. Petersene73aec82007-02-27 22:40:55 -0500213 sd_print_sense_hdr(sdkp, &sshdr);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600214 return -EINVAL;
215 }
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -0600216 revalidate_disk(sdkp->disk);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600217 return count;
218}
219
Tony Jonesee959b02008-02-22 00:13:36 +0100220static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700221manage_start_stop_show(struct device *dev, struct device_attribute *attr,
222 char *buf)
223{
224 struct scsi_disk *sdkp = to_scsi_disk(dev);
225 struct scsi_device *sdp = sdkp->device;
226
227 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
228}
229
230static ssize_t
231manage_start_stop_store(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900233{
Tony Jonesee959b02008-02-22 00:13:36 +0100234 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900235 struct scsi_device *sdp = sdkp->device;
236
237 if (!capable(CAP_SYS_ADMIN))
238 return -EACCES;
239
240 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
241
242 return count;
243}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700244static DEVICE_ATTR_RW(manage_start_stop);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900245
Tony Jonesee959b02008-02-22 00:13:36 +0100246static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700247allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
248{
249 struct scsi_disk *sdkp = to_scsi_disk(dev);
250
251 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
252}
253
254static ssize_t
255allow_restart_store(struct device *dev, struct device_attribute *attr,
256 const char *buf, size_t count)
Brian Kinga144c5a2006-06-27 11:10:31 -0500257{
Tony Jonesee959b02008-02-22 00:13:36 +0100258 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500259 struct scsi_device *sdp = sdkp->device;
260
261 if (!capable(CAP_SYS_ADMIN))
262 return -EACCES;
263
264 if (sdp->type != TYPE_DISK)
265 return -EINVAL;
266
267 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
268
269 return count;
270}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700271static DEVICE_ATTR_RW(allow_restart);
Brian Kinga144c5a2006-06-27 11:10:31 -0500272
Tony Jonesee959b02008-02-22 00:13:36 +0100273static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700274cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600275{
Tony Jonesee959b02008-02-22 00:13:36 +0100276 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600277 int ct = sdkp->RCD + 2*sdkp->WCE;
278
279 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
280}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700281static DEVICE_ATTR_RW(cache_type);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600282
Tony Jonesee959b02008-02-22 00:13:36 +0100283static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700284FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600285{
Tony Jonesee959b02008-02-22 00:13:36 +0100286 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600287
288 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
289}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700290static DEVICE_ATTR_RO(FUA);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600291
Tony Jonesee959b02008-02-22 00:13:36 +0100292static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700293protection_type_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
Martin K. Petersene0597d72008-07-17 04:28:34 -0400295{
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
297
298 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
299}
300
301static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700302protection_type_store(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t count)
Martin K. Petersen81724992012-08-28 14:29:34 -0400304{
305 struct scsi_disk *sdkp = to_scsi_disk(dev);
306 unsigned int val;
307 int err;
308
309 if (!capable(CAP_SYS_ADMIN))
310 return -EACCES;
311
312 err = kstrtouint(buf, 10, &val);
313
314 if (err)
315 return err;
316
317 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
318 sdkp->protection_type = val;
319
320 return count;
321}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700322static DEVICE_ATTR_RW(protection_type);
Martin K. Petersen81724992012-08-28 14:29:34 -0400323
324static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700325protection_mode_show(struct device *dev, struct device_attribute *attr,
326 char *buf)
Martin K. Petersen518fa8e2010-10-08 01:36:24 -0400327{
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329 struct scsi_device *sdp = sdkp->device;
330 unsigned int dif, dix;
331
332 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
333 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
334
335 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
336 dif = 0;
337 dix = 1;
338 }
339
340 if (!dif && !dix)
341 return snprintf(buf, 20, "none\n");
342
343 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
344}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700345static DEVICE_ATTR_RO(protection_mode);
Martin K. Petersen518fa8e2010-10-08 01:36:24 -0400346
347static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700348app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
Martin K. Petersene0597d72008-07-17 04:28:34 -0400349{
350 struct scsi_disk *sdkp = to_scsi_disk(dev);
351
352 return snprintf(buf, 20, "%u\n", sdkp->ATO);
353}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700354static DEVICE_ATTR_RO(app_tag_own);
Martin K. Petersene0597d72008-07-17 04:28:34 -0400355
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500356static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700357thin_provisioning_show(struct device *dev, struct device_attribute *attr,
358 char *buf)
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500359{
360 struct scsi_disk *sdkp = to_scsi_disk(dev);
361
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500362 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
363}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700364static DEVICE_ATTR_RO(thin_provisioning);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500365
366static const char *lbp_mode[] = {
367 [SD_LBP_FULL] = "full",
368 [SD_LBP_UNMAP] = "unmap",
369 [SD_LBP_WS16] = "writesame_16",
370 [SD_LBP_WS10] = "writesame_10",
371 [SD_LBP_ZERO] = "writesame_zero",
372 [SD_LBP_DISABLE] = "disabled",
373};
374
375static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700376provisioning_mode_show(struct device *dev, struct device_attribute *attr,
377 char *buf)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500378{
379 struct scsi_disk *sdkp = to_scsi_disk(dev);
380
381 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
382}
383
384static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700385provisioning_mode_store(struct device *dev, struct device_attribute *attr,
386 const char *buf, size_t count)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500387{
388 struct scsi_disk *sdkp = to_scsi_disk(dev);
389 struct scsi_device *sdp = sdkp->device;
390
391 if (!capable(CAP_SYS_ADMIN))
392 return -EACCES;
393
394 if (sdp->type != TYPE_DISK)
395 return -EINVAL;
396
397 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
398 sd_config_discard(sdkp, SD_LBP_UNMAP);
399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
400 sd_config_discard(sdkp, SD_LBP_WS16);
401 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
402 sd_config_discard(sdkp, SD_LBP_WS10);
403 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
404 sd_config_discard(sdkp, SD_LBP_ZERO);
405 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
406 sd_config_discard(sdkp, SD_LBP_DISABLE);
407 else
408 return -EINVAL;
409
410 return count;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500411}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700412static DEVICE_ATTR_RW(provisioning_mode);
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500413
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500414static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700415max_medium_access_timeouts_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500417{
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
421}
422
423static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700424max_medium_access_timeouts_store(struct device *dev,
425 struct device_attribute *attr, const char *buf,
426 size_t count)
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500427{
428 struct scsi_disk *sdkp = to_scsi_disk(dev);
429 int err;
430
431 if (!capable(CAP_SYS_ADMIN))
432 return -EACCES;
433
434 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
435
436 return err ? err : count;
437}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700438static DEVICE_ATTR_RW(max_medium_access_timeouts);
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500439
Martin K. Petersen5db44862012-09-18 12:19:32 -0400440static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700441max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
442 char *buf)
Martin K. Petersen5db44862012-09-18 12:19:32 -0400443{
444 struct scsi_disk *sdkp = to_scsi_disk(dev);
445
446 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
447}
448
449static ssize_t
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700450max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
451 const char *buf, size_t count)
Martin K. Petersen5db44862012-09-18 12:19:32 -0400452{
453 struct scsi_disk *sdkp = to_scsi_disk(dev);
454 struct scsi_device *sdp = sdkp->device;
455 unsigned long max;
456 int err;
457
458 if (!capable(CAP_SYS_ADMIN))
459 return -EACCES;
460
461 if (sdp->type != TYPE_DISK)
462 return -EINVAL;
463
464 err = kstrtoul(buf, 10, &max);
465
466 if (err)
467 return err;
468
469 if (max == 0)
470 sdp->no_write_same = 1;
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400471 else if (max <= SD_MAX_WS16_BLOCKS) {
472 sdp->no_write_same = 0;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400473 sdkp->max_ws_blocks = max;
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400474 }
Martin K. Petersen5db44862012-09-18 12:19:32 -0400475
476 sd_config_write_same(sdkp);
477
478 return count;
479}
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700480static DEVICE_ATTR_RW(max_write_same_blocks);
Martin K. Petersen5db44862012-09-18 12:19:32 -0400481
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700482static struct attribute *sd_disk_attrs[] = {
483 &dev_attr_cache_type.attr,
484 &dev_attr_FUA.attr,
485 &dev_attr_allow_restart.attr,
486 &dev_attr_manage_start_stop.attr,
487 &dev_attr_protection_type.attr,
488 &dev_attr_protection_mode.attr,
489 &dev_attr_app_tag_own.attr,
490 &dev_attr_thin_provisioning.attr,
491 &dev_attr_provisioning_mode.attr,
492 &dev_attr_max_write_same_blocks.attr,
493 &dev_attr_max_medium_access_timeouts.attr,
494 NULL,
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600495};
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700496ATTRIBUTE_GROUPS(sd_disk);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600497
498static struct class sd_disk_class = {
499 .name = "scsi_disk",
500 .owner = THIS_MODULE,
Tony Jonesee959b02008-02-22 00:13:36 +0100501 .dev_release = scsi_disk_release,
Greg Kroah-Hartmane1ea2352013-07-24 15:05:28 -0700502 .dev_groups = sd_disk_groups,
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600503};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Aaron Lu691e3d32012-11-09 15:27:55 +0800505static const struct dev_pm_ops sd_pm_ops = {
Oliver Neukum95897912013-09-16 13:28:15 +0200506 .suspend = sd_suspend_system,
Aaron Lu691e3d32012-11-09 15:27:55 +0800507 .resume = sd_resume,
Oliver Neukum95897912013-09-16 13:28:15 +0200508 .poweroff = sd_suspend_system,
Aaron Lu691e3d32012-11-09 15:27:55 +0800509 .restore = sd_resume,
Oliver Neukum95897912013-09-16 13:28:15 +0200510 .runtime_suspend = sd_suspend_runtime,
Aaron Lu691e3d32012-11-09 15:27:55 +0800511 .runtime_resume = sd_resume,
512};
513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514static struct scsi_driver sd_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 .gendrv = {
516 .name = "sd",
Christoph Hellwig3af6b352014-11-12 18:34:51 +0100517 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 .probe = sd_probe,
519 .remove = sd_remove,
520 .shutdown = sd_shutdown,
Aaron Lu691e3d32012-11-09 15:27:55 +0800521 .pm = &sd_pm_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 },
523 .rescan = sd_rescan,
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +0200524 .init_command = sd_init_command,
525 .uninit_command = sd_uninit_command,
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800526 .done = sd_done,
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -0500527 .eh_action = sd_eh_action,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528};
529
530/*
Hannes Reinecke0761df92013-05-10 11:06:16 +0200531 * Dummy kobj_map->probe function.
532 * The default ->probe function will call modprobe, which is
533 * pointless as this module is already loaded.
534 */
535static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
536{
537 return NULL;
538}
539
540/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 * Device no to disk mapping:
542 *
543 * major disc2 disc p1
544 * |............|.............|....|....| <- dev_t
545 * 31 20 19 8 7 4 3 0
546 *
547 * Inside a major, we have 16k disks, however mapped non-
548 * contiguously. The first 16 disks are for major0, the next
549 * ones with major1, ... Disk 256 is for major0 again, disk 272
550 * for major1, ...
551 * As we stay compatible with our numbering scheme, we can reuse
552 * the well-know SCSI majors 8, 65--71, 136--143.
553 */
554static int sd_major(int major_idx)
555{
556 switch (major_idx) {
557 case 0:
558 return SCSI_DISK0_MAJOR;
559 case 1 ... 7:
560 return SCSI_DISK1_MAJOR + major_idx - 1;
561 case 8 ... 15:
562 return SCSI_DISK8_MAJOR + major_idx - 8;
563 default:
564 BUG();
565 return 0; /* shut up gcc */
566 }
567}
568
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +0100569static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
571 struct scsi_disk *sdkp = NULL;
572
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +0100573 mutex_lock(&sd_ref_mutex);
574
Alan Stern39b7f1e2005-11-04 14:44:41 -0500575 if (disk->private_data) {
576 sdkp = scsi_disk(disk);
577 if (scsi_device_get(sdkp->device) == 0)
Tony Jonesee959b02008-02-22 00:13:36 +0100578 get_device(&sdkp->dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500579 else
580 sdkp = NULL;
581 }
Arjan van de Ven0b950672006-01-11 13:16:10 +0100582 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 return sdkp;
584}
585
586static void scsi_disk_put(struct scsi_disk *sdkp)
587{
588 struct scsi_device *sdev = sdkp->device;
589
Arjan van de Ven0b950672006-01-11 13:16:10 +0100590 mutex_lock(&sd_ref_mutex);
Tony Jonesee959b02008-02-22 00:13:36 +0100591 put_device(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100593 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
Martin K. Petersenc6115292014-09-26 19:20:08 -0400596static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
597 unsigned int dix, unsigned int dif)
598{
599 struct bio *bio = scmd->request->bio;
600 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
601 unsigned int protect = 0;
602
603 if (dix) { /* DIX Type 0, 1, 2, 3 */
604 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
605 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
606
607 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
608 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
609 }
610
611 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
612 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
613
614 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
615 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
616 }
617
618 if (dif) { /* DIX/DIF Type 1, 2, 3 */
619 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
620
621 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
622 protect = 3 << 5; /* Disable target PI checking */
623 else
624 protect = 1 << 5; /* Enable target PI checking */
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400625 }
626
627 scsi_set_prot_op(scmd, prot_op);
628 scsi_set_prot_type(scmd, dif);
Martin K. Petersenc6115292014-09-26 19:20:08 -0400629 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
630
631 return protect;
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400632}
633
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500634static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
635{
636 struct request_queue *q = sdkp->disk->queue;
637 unsigned int logical_block_size = sdkp->device->sector_size;
638 unsigned int max_blocks = 0;
639
Martin K. Petersen79850902014-11-07 00:08:13 -0500640 q->limits.discard_zeroes_data = 0;
Martin K. Petersen39773722015-11-13 16:46:47 -0500641
642 /*
643 * When LBPRZ is reported, discard alignment and granularity
644 * must be fixed to the logical block size. Otherwise the block
645 * layer will drop misaligned portions of the request which can
646 * lead to data corruption. If LBPRZ is not set, we honor the
647 * device preference.
648 */
649 if (sdkp->lbprz) {
650 q->limits.discard_alignment = 0;
651 q->limits.discard_granularity = 1;
652 } else {
653 q->limits.discard_alignment = sdkp->unmap_alignment *
654 logical_block_size;
655 q->limits.discard_granularity =
656 max(sdkp->physical_block_size,
657 sdkp->unmap_granularity * logical_block_size);
658 }
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500659
Martin K. Petersen89730392012-02-13 15:39:00 -0500660 sdkp->provisioning_mode = mode;
661
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500662 switch (mode) {
663
664 case SD_LBP_DISABLE:
Jens Axboe2bb4cd52015-07-14 08:15:12 -0600665 blk_queue_max_discard_sectors(q, 0);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500666 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
667 return;
668
669 case SD_LBP_UNMAP:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400670 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
671 (u32)SD_MAX_WS16_BLOCKS);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500672 break;
673
674 case SD_LBP_WS16:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400675 max_blocks = min_not_zero(sdkp->max_ws_blocks,
676 (u32)SD_MAX_WS16_BLOCKS);
Martin K. Petersen79850902014-11-07 00:08:13 -0500677 q->limits.discard_zeroes_data = sdkp->lbprz;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500678 break;
679
680 case SD_LBP_WS10:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400681 max_blocks = min_not_zero(sdkp->max_ws_blocks,
682 (u32)SD_MAX_WS10_BLOCKS);
Martin K. Petersen79850902014-11-07 00:08:13 -0500683 q->limits.discard_zeroes_data = sdkp->lbprz;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500684 break;
685
686 case SD_LBP_ZERO:
Martin K. Petersen5db44862012-09-18 12:19:32 -0400687 max_blocks = min_not_zero(sdkp->max_ws_blocks,
688 (u32)SD_MAX_WS10_BLOCKS);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500689 q->limits.discard_zeroes_data = 1;
690 break;
691 }
692
Jens Axboe2bb4cd52015-07-14 08:15:12 -0600693 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500694 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500695}
696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697/**
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400698 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200699 * @sdp: scsi device to operate one
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500700 * @rq: Request to prepare
701 *
702 * Will issue either UNMAP or WRITE SAME(16) depending on preference
703 * indicated by target device.
704 **/
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200705static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500706{
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200707 struct request *rq = cmd->request;
708 struct scsi_device *sdp = cmd->device;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500709 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400710 sector_t sector = blk_rq_pos(rq);
711 unsigned int nr_sectors = blk_rq_sectors(rq);
712 unsigned int nr_bytes = blk_rq_bytes(rq);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200713 unsigned int len;
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900714 int ret;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500715 char *buf;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200716 struct page *page;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500717
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400718 sector >>= ilog2(sdp->sector_size) - 9;
719 nr_sectors >>= ilog2(sdp->sector_size) - 9;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500720
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200721 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
722 if (!page)
723 return BLKPREP_DEFER;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500724
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500725 switch (sdkp->provisioning_mode) {
726 case SD_LBP_UNMAP:
727 buf = page_address(page);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200728
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200729 cmd->cmd_len = 10;
730 cmd->cmnd[0] = UNMAP;
731 cmd->cmnd[8] = 24;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500732
733 put_unaligned_be16(6 + 16, &buf[0]);
734 put_unaligned_be16(16, &buf[2]);
735 put_unaligned_be64(sector, &buf[8]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200736 put_unaligned_be32(nr_sectors, &buf[16]);
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500737
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200738 len = 24;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500739 break;
740
741 case SD_LBP_WS16:
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200742 cmd->cmd_len = 16;
743 cmd->cmnd[0] = WRITE_SAME_16;
744 cmd->cmnd[1] = 0x8; /* UNMAP */
745 put_unaligned_be64(sector, &cmd->cmnd[2]);
746 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200747
748 len = sdkp->device->sector_size;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500749 break;
750
751 case SD_LBP_WS10:
752 case SD_LBP_ZERO:
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200753 cmd->cmd_len = 10;
754 cmd->cmnd[0] = WRITE_SAME;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500755 if (sdkp->provisioning_mode == SD_LBP_WS10)
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200756 cmd->cmnd[1] = 0x8; /* UNMAP */
757 put_unaligned_be32(sector, &cmd->cmnd[2]);
758 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500759
760 len = sdkp->device->sector_size;
761 break;
762
763 default:
Martin K. Petersen09b9cc42011-03-22 00:27:42 -0400764 ret = BLKPREP_KILL;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500765 goto out;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500766 }
767
Jens Axboedc4a9302014-04-16 21:37:30 -0600768 rq->completion_data = page;
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200769 rq->timeout = SD_TIMEOUT;
770
771 cmd->transfersize = len;
Christoph Hellwige4200f82014-06-28 16:18:59 +0200772 cmd->allowed = SD_MAX_RETRIES;
Christoph Hellwig6a7b4392014-06-28 12:35:13 +0200773
774 /*
775 * Initially __data_len is set to the amount of data that needs to be
776 * transferred to the target. This amount depends on whether WRITE SAME
777 * or UNMAP is being used. After the scatterlist has been mapped by
778 * scsi_init_io() we set __data_len to the size of the area to be
779 * discarded on disk. This allows us to report completion on the full
780 * amount of blocks described by the request.
781 */
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200782 blk_add_request_payload(rq, page, len);
Christoph Hellwig3c356bd2014-09-05 18:20:23 -0700783 ret = scsi_init_io(cmd);
Martin K. Petersen26e85fc2012-09-18 12:19:31 -0400784 rq->__data_len = nr_bytes;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -0500785
786out:
Jens Axboeb4f42e22014-04-10 09:46:28 -0600787 if (ret != BLKPREP_OK)
FUJITA Tomonori610a6342010-07-08 10:16:17 +0200788 __free_page(page);
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900789 return ret;
790}
791
Martin K. Petersen5db44862012-09-18 12:19:32 -0400792static void sd_config_write_same(struct scsi_disk *sdkp)
793{
794 struct request_queue *q = sdkp->disk->queue;
795 unsigned int logical_block_size = sdkp->device->sector_size;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400796
797 if (sdkp->device->no_write_same) {
798 sdkp->max_ws_blocks = 0;
799 goto out;
800 }
801
802 /* Some devices can not handle block counts above 0xffff despite
803 * supporting WRITE SAME(16). Consequently we default to 64k
804 * blocks per I/O unless the device explicitly advertises a
805 * bigger limit.
806 */
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400807 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
808 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
809 (u32)SD_MAX_WS16_BLOCKS);
810 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
811 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
812 (u32)SD_MAX_WS10_BLOCKS);
813 else {
814 sdkp->device->no_write_same = 1;
815 sdkp->max_ws_blocks = 0;
816 }
Martin K. Petersen5db44862012-09-18 12:19:32 -0400817
818out:
Martin K. Petersen66c28f92013-06-06 22:15:55 -0400819 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
820 (logical_block_size >> 9));
Martin K. Petersen5db44862012-09-18 12:19:32 -0400821}
822
823/**
824 * sd_setup_write_same_cmnd - write the same data to multiple blocks
Christoph Hellwig59b11342014-06-28 12:22:22 +0200825 * @cmd: command to prepare
Martin K. Petersen5db44862012-09-18 12:19:32 -0400826 *
827 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
828 * preference indicated by target device.
829 **/
Christoph Hellwig59b11342014-06-28 12:22:22 +0200830static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
Martin K. Petersen5db44862012-09-18 12:19:32 -0400831{
Christoph Hellwig59b11342014-06-28 12:22:22 +0200832 struct request *rq = cmd->request;
833 struct scsi_device *sdp = cmd->device;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400834 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
835 struct bio *bio = rq->bio;
836 sector_t sector = blk_rq_pos(rq);
837 unsigned int nr_sectors = blk_rq_sectors(rq);
838 unsigned int nr_bytes = blk_rq_bytes(rq);
839 int ret;
840
841 if (sdkp->device->no_write_same)
842 return BLKPREP_KILL;
843
Kent Overstreeta4ad39b12013-08-07 14:24:32 -0700844 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
Martin K. Petersen5db44862012-09-18 12:19:32 -0400845
846 sector >>= ilog2(sdp->sector_size) - 9;
847 nr_sectors >>= ilog2(sdp->sector_size) - 9;
848
Martin K. Petersen5db44862012-09-18 12:19:32 -0400849 rq->timeout = SD_WRITE_SAME_TIMEOUT;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400850
851 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
Christoph Hellwig59b11342014-06-28 12:22:22 +0200852 cmd->cmd_len = 16;
853 cmd->cmnd[0] = WRITE_SAME_16;
854 put_unaligned_be64(sector, &cmd->cmnd[2]);
855 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
Martin K. Petersen5db44862012-09-18 12:19:32 -0400856 } else {
Christoph Hellwig59b11342014-06-28 12:22:22 +0200857 cmd->cmd_len = 10;
858 cmd->cmnd[0] = WRITE_SAME;
859 put_unaligned_be32(sector, &cmd->cmnd[2]);
860 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
Martin K. Petersen5db44862012-09-18 12:19:32 -0400861 }
862
Christoph Hellwig59b11342014-06-28 12:22:22 +0200863 cmd->transfersize = sdp->sector_size;
Christoph Hellwiga25ee542014-06-28 12:29:19 +0200864 cmd->allowed = SD_MAX_RETRIES;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400865
Christoph Hellwig59b11342014-06-28 12:22:22 +0200866 /*
867 * For WRITE_SAME the data transferred in the DATA IN buffer is
868 * different from the amount of data actually written to the target.
869 *
870 * We set up __data_len to the amount of data transferred from the
871 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
872 * to transfer a single sector of data first, but then reset it to
873 * the amount of data to be written right after so that the I/O path
874 * knows how much to actually write.
875 */
876 rq->__data_len = sdp->sector_size;
Christoph Hellwig3c356bd2014-09-05 18:20:23 -0700877 ret = scsi_init_io(cmd);
Christoph Hellwig59b11342014-06-28 12:22:22 +0200878 rq->__data_len = nr_bytes;
Martin K. Petersen5db44862012-09-18 12:19:32 -0400879 return ret;
880}
881
Christoph Hellwiga118c6c2014-06-28 12:08:05 +0200882static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900883{
Christoph Hellwiga118c6c2014-06-28 12:08:05 +0200884 struct request *rq = cmd->request;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900885
Christoph Hellwiga118c6c2014-06-28 12:08:05 +0200886 /* flush requests don't perform I/O, zero the S/G table */
887 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
888
889 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
890 cmd->cmd_len = 10;
891 cmd->transfersize = 0;
892 cmd->allowed = SD_MAX_RETRIES;
893
K. Y. Srinivasan26b9fd82014-07-18 17:11:27 +0200894 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
Christoph Hellwiga118c6c2014-06-28 12:08:05 +0200895 return BLKPREP_OK;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900896}
897
Christoph Hellwig87949ee2014-06-28 12:40:18 +0200898static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899{
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +0200900 struct request *rq = SCpnt->request;
901 struct scsi_device *sdp = SCpnt->device;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100902 struct gendisk *disk = rq->rq_disk;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400903 struct scsi_disk *sdkp;
Tejun Heo83096eb2009-05-07 22:24:39 +0900904 sector_t block = blk_rq_pos(rq);
Linus Torvalds18351072008-08-05 21:42:21 -0700905 sector_t threshold;
Tejun Heo83096eb2009-05-07 22:24:39 +0900906 unsigned int this_count = blk_rq_sectors(rq);
Martin K. Petersenc6115292014-09-26 19:20:08 -0400907 unsigned int dif, dix;
908 int ret;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400909 unsigned char protect;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500910
Christoph Hellwig3c356bd2014-09-05 18:20:23 -0700911 ret = scsi_init_io(SCpnt);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500912 if (ret != BLKPREP_OK)
913 goto out;
914 SCpnt = rq->special;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400915 sdkp = scsi_disk(disk);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500916
917 /* from here on until we're complete, any goto out
918 * is used for a killable error condition */
919 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +0200921 SCSI_LOG_HLQUEUE(1,
922 scmd_printk(KERN_INFO, SCpnt,
923 "%s: block=%llu, count=%d\n",
924 __func__, (unsigned long long)block, this_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
926 if (!sdp || !scsi_device_online(sdp) ||
Tejun Heo83096eb2009-05-07 22:24:39 +0900927 block + blk_rq_sectors(rq) > get_capacity(disk)) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500928 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900929 "Finishing %u sectors\n",
930 blk_rq_sectors(rq)));
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500931 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
932 "Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500933 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 }
935
936 if (sdp->changed) {
937 /*
938 * quietly refuse to do anything to a changed disc until
939 * the changed bit has been reset
940 */
Alan Stern3ff55882010-09-07 11:44:01 -0400941 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500942 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 }
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500944
Hans de Goedea0899d42008-01-20 11:12:26 +0100945 /*
Linus Torvalds18351072008-08-05 21:42:21 -0700946 * Some SD card readers can't handle multi-sector accesses which touch
947 * the last one or two hardware sectors. Split accesses as needed.
Hans de Goedea0899d42008-01-20 11:12:26 +0100948 */
Linus Torvalds18351072008-08-05 21:42:21 -0700949 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
950 (sdp->sector_size / 512);
951
952 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
953 if (block < threshold) {
954 /* Access up to the threshold but not beyond */
955 this_count = threshold - block;
956 } else {
957 /* Access only a single hardware sector */
958 this_count = sdp->sector_size / 512;
959 }
960 }
Hans de Goedea0899d42008-01-20 11:12:26 +0100961
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500962 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
963 (unsigned long long)block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964
965 /*
966 * If we have a 1K hardware sectorsize, prevent access to single
967 * 512 byte sectors. In theory we could handle this - in fact
968 * the scsi cdrom driver must be able to handle this because
969 * we typically use 1K blocksizes, and cdroms typically have
970 * 2K hardware sectorsizes. Of course, things are simpler
971 * with the cdrom, since it is read-only. For performance
972 * reasons, the filesystems should be able to handle this
973 * and not force the scsi disk driver to use bounce buffers
974 * for this.
975 */
976 if (sdp->sector_size == 1024) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900977 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500978 scmd_printk(KERN_ERR, SCpnt,
979 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500980 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 } else {
982 block = block >> 1;
983 this_count = this_count >> 1;
984 }
985 }
986 if (sdp->sector_size == 2048) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900987 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500988 scmd_printk(KERN_ERR, SCpnt,
989 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500990 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 } else {
992 block = block >> 2;
993 this_count = this_count >> 2;
994 }
995 }
996 if (sdp->sector_size == 4096) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900997 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500998 scmd_printk(KERN_ERR, SCpnt,
999 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -05001000 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 } else {
1002 block = block >> 3;
1003 this_count = this_count >> 3;
1004 }
1005 }
1006 if (rq_data_dir(rq) == WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 SCpnt->cmnd[0] = WRITE_6;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001008
Martin K. Petersen8c579ab2012-08-28 14:29:33 -04001009 if (blk_integrity_rq(rq))
Martin K. Petersenc6115292014-09-26 19:20:08 -04001010 sd_dif_prepare(SCpnt);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 } else if (rq_data_dir(rq) == READ) {
1013 SCpnt->cmnd[0] = READ_6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 } else {
Jens Axboe59533162013-05-23 12:25:08 +02001015 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
James Bottomley7f9a6bc2007-08-04 10:06:25 -05001016 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 }
1018
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001019 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +09001020 "%s %d/%u 512 byte blocks.\n",
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001021 (rq_data_dir(rq) == WRITE) ?
1022 "writing" : "reading", this_count,
Tejun Heo83096eb2009-05-07 22:24:39 +09001023 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Martin K. Petersenc6115292014-09-26 19:20:08 -04001025 dix = scsi_prot_sg_count(SCpnt);
1026 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1027
1028 if (dif || dix)
1029 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001030 else
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001031 protect = 0;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001032
Martin K. Petersenc6115292014-09-26 19:20:08 -04001033 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001034 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1035
1036 if (unlikely(SCpnt->cmnd == NULL)) {
1037 ret = BLKPREP_DEFER;
1038 goto out;
1039 }
1040
1041 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1042 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1043 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1044 SCpnt->cmnd[7] = 0x18;
1045 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001046 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001047
1048 /* LBA */
1049 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1050 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1051 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1052 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1053 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1054 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1055 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1056 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1057
1058 /* Expected Indirect LBA */
1059 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1060 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1061 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1062 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1063
1064 /* Transfer length */
1065 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1066 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1067 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1068 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
Akinobu Mitae430cbc2014-06-02 22:56:47 +09001069 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 SCpnt->cmnd[0] += READ_16 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001071 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1073 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1074 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1075 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1076 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1077 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1078 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1079 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1080 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1081 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1082 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1083 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1084 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1085 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001086 scsi_device_protection(SCpnt->device) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 SCpnt->device->use_10_for_rw) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 SCpnt->cmnd[0] += READ_10 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001089 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1091 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1092 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1093 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1094 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1095 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1096 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1097 } else {
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001098 if (unlikely(rq->cmd_flags & REQ_FUA)) {
Tejun Heo007365a2006-01-06 09:53:52 +01001099 /*
1100 * This happens only if this drive failed
1101 * 10byte rw command with ILLEGAL_REQUEST
1102 * during operation and thus turned off
1103 * use_10_for_rw.
1104 */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001105 scmd_printk(KERN_ERR, SCpnt,
1106 "FUA write on READ/WRITE(6) drive\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -05001107 goto out;
Tejun Heo007365a2006-01-06 09:53:52 +01001108 }
1109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1111 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1112 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1113 SCpnt->cmnd[4] = (unsigned char) this_count;
1114 SCpnt->cmnd[5] = 0;
1115 }
Boaz Harrosh30b0c372007-12-13 13:47:40 +02001116 SCpnt->sdb.length = this_count * sdp->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
1118 /*
1119 * We shouldn't disconnect in the middle of a sector, so with a dumb
1120 * host adapter, it's safe to assume that we can at least transfer
1121 * this many bytes between each connect / disconnect.
1122 */
1123 SCpnt->transfersize = sdp->sector_size;
1124 SCpnt->underflow = this_count << 9;
1125 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
1127 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 * This indicates that the command is ready from our end to be
1129 * queued.
1130 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -05001131 ret = BLKPREP_OK;
1132 out:
Christoph Hellwiga1b73fc2014-05-01 16:51:04 +02001133 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134}
1135
Christoph Hellwig87949ee2014-06-28 12:40:18 +02001136static int sd_init_command(struct scsi_cmnd *cmd)
1137{
1138 struct request *rq = cmd->request;
1139
1140 if (rq->cmd_flags & REQ_DISCARD)
1141 return sd_setup_discard_cmnd(cmd);
1142 else if (rq->cmd_flags & REQ_WRITE_SAME)
1143 return sd_setup_write_same_cmnd(cmd);
1144 else if (rq->cmd_flags & REQ_FLUSH)
1145 return sd_setup_flush_cmnd(cmd);
1146 else
1147 return sd_setup_read_write_cmnd(cmd);
1148}
1149
1150static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1151{
1152 struct request *rq = SCpnt->request;
1153
1154 if (rq->cmd_flags & REQ_DISCARD)
1155 __free_page(rq->completion_data);
1156
1157 if (SCpnt->cmnd != rq->cmd) {
1158 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1159 SCpnt->cmnd = NULL;
1160 SCpnt->cmd_len = 0;
1161 }
1162}
1163
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164/**
1165 * sd_open - open a scsi disk device
1166 * @inode: only i_rdev member may be used
1167 * @filp: only f_mode and f_flags may be used
1168 *
1169 * Returns 0 if successful. Returns a negated errno value in case
1170 * of error.
1171 *
1172 * Note: This can be called from a user context (e.g. fsck(1) )
1173 * or from within the kernel (e.g. as a result of a mount(1) ).
1174 * In the latter case @inode and @filp carry an abridged amount
1175 * of information as noted above.
Arnd Bergmann409f3492010-07-07 16:51:29 +02001176 *
1177 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 **/
Al Viro0338e292008-03-02 10:41:04 -05001179static int sd_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180{
Al Viro0338e292008-03-02 10:41:04 -05001181 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 struct scsi_device *sdev;
1183 int retval;
1184
Al Viro0338e292008-03-02 10:41:04 -05001185 if (!sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 return -ENXIO;
1187
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001188 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
1190 sdev = sdkp->device;
1191
1192 /*
1193 * If the device is in error recovery, wait until it is done.
1194 * If the device is offline, then disallow any access to it.
1195 */
1196 retval = -ENXIO;
1197 if (!scsi_block_when_processing_errors(sdev))
1198 goto error_out;
1199
1200 if (sdev->removable || sdkp->write_prot)
Al Viro0338e292008-03-02 10:41:04 -05001201 check_disk_change(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
1203 /*
1204 * If the drive is empty, just let the open fail.
1205 */
1206 retval = -ENOMEDIUM;
Al Viro0338e292008-03-02 10:41:04 -05001207 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 goto error_out;
1209
1210 /*
1211 * If the device has the write protect tab set, have the open fail
1212 * if the user expects to be able to write to the thing.
1213 */
1214 retval = -EROFS;
Al Viro0338e292008-03-02 10:41:04 -05001215 if (sdkp->write_prot && (mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 goto error_out;
1217
1218 /*
1219 * It is possible that the disk changing stuff resulted in
1220 * the device being taken offline. If this is the case,
1221 * report this to the user, and don't pretend that the
1222 * open actually succeeded.
1223 */
1224 retval = -ENXIO;
1225 if (!scsi_device_online(sdev))
1226 goto error_out;
1227
Arnd Bergmann409f3492010-07-07 16:51:29 +02001228 if ((atomic_inc_return(&sdkp->openers) == 1) && 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_PREVENT);
1231 }
1232
1233 return 0;
1234
1235error_out:
1236 scsi_disk_put(sdkp);
1237 return retval;
1238}
1239
1240/**
1241 * sd_release - invoked when the (last) close(2) is called on this
1242 * scsi disk.
1243 * @inode: only i_rdev member may be used
1244 * @filp: only f_mode and f_flags may be used
1245 *
1246 * Returns 0.
1247 *
1248 * Note: may block (uninterruptible) if error recovery is underway
1249 * on this disk.
Arnd Bergmann409f3492010-07-07 16:51:29 +02001250 *
1251 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 **/
Al Virodb2a1442013-05-05 21:52:57 -04001253static void sd_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 struct scsi_disk *sdkp = scsi_disk(disk);
1256 struct scsi_device *sdev = sdkp->device;
1257
James Bottomley56937f72007-03-11 12:25:33 -05001258 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
Alan Stern7e443312010-09-07 11:27:52 -04001260 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 if (scsi_block_when_processing_errors(sdev))
1262 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1263 }
1264
1265 /*
1266 * XXX and what if there are packets in flight and this close()
1267 * XXX is followed by a "rmmod sd_mod"?
1268 */
Alan Stern478a8a02010-06-16 14:52:17 -04001269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 scsi_disk_put(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271}
1272
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001273static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274{
1275 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1276 struct scsi_device *sdp = sdkp->device;
1277 struct Scsi_Host *host = sdp->host;
1278 int diskinfo[4];
1279
1280 /* default to most commonly used values */
1281 diskinfo[0] = 0x40; /* 1 << 6 */
1282 diskinfo[1] = 0x20; /* 1 << 5 */
1283 diskinfo[2] = sdkp->capacity >> 11;
1284
1285 /* override with calculated, extended default, or driver values */
1286 if (host->hostt->bios_param)
1287 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1288 else
1289 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1290
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001291 geo->heads = diskinfo[0];
1292 geo->sectors = diskinfo[1];
1293 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 return 0;
1295}
1296
1297/**
1298 * sd_ioctl - process an ioctl
1299 * @inode: only i_rdev/i_bdev members may be used
1300 * @filp: only f_mode and f_flags may be used
1301 * @cmd: ioctl command number
1302 * @arg: this is third argument given to ioctl(2) system call.
1303 * Often contains a pointer.
1304 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001305 * Returns 0 if successful (some ioctls return positive numbers on
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 * success as well). Returns a negated errno value in case of error.
1307 *
1308 * Note: most ioctls are forward onto the block subsystem or further
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +02001309 * down in the scsi subsystem.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 **/
Al Viro0338e292008-03-02 10:41:04 -05001311static int sd_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 unsigned int cmd, unsigned long arg)
1313{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 struct gendisk *disk = bdev->bd_disk;
Nao Nishijimafe2d1852011-08-25 18:04:14 +09001315 struct scsi_disk *sdkp = scsi_disk(disk);
1316 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 void __user *p = (void __user *)arg;
1318 int error;
1319
Nao Nishijimafe2d1852011-08-25 18:04:14 +09001320 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1321 "cmd=0x%x\n", disk->disk_name, cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +01001323 error = scsi_verify_blk_ioctl(bdev, cmd);
1324 if (error < 0)
1325 return error;
1326
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 /*
1328 * If we are in the middle of error recovery, don't let anyone
1329 * else try and use this device. Also, if error recovery fails, it
1330 * may try and take the device offline, in which case all further
1331 * access to the device is prohibited.
1332 */
Christoph Hellwig906d15f2014-10-11 16:25:31 +02001333 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1334 (mode & FMODE_NDELAY) != 0);
1335 if (error)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001336 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 /*
1339 * Send SCSI addressing ioctls directly to mid level, send other
1340 * ioctls to block level and then onto mid level if they can't be
1341 * resolved.
1342 */
1343 switch (cmd) {
1344 case SCSI_IOCTL_GET_IDLUN:
1345 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001346 error = scsi_ioctl(sdp, cmd, p);
1347 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 default:
Paolo Bonzini577ebb32012-01-12 16:01:27 +01001349 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 if (error != -ENOTTY)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001351 break;
1352 error = scsi_ioctl(sdp, cmd, p);
1353 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 }
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001355out:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001356 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357}
1358
1359static void set_media_not_present(struct scsi_disk *sdkp)
1360{
Tejun Heo2bae0092010-12-18 18:42:23 +01001361 if (sdkp->media_present)
1362 sdkp->device->changed = 1;
1363
1364 if (sdkp->device->removable) {
1365 sdkp->media_present = 0;
1366 sdkp->capacity = 0;
1367 }
1368}
1369
1370static int media_not_present(struct scsi_disk *sdkp,
1371 struct scsi_sense_hdr *sshdr)
1372{
1373 if (!scsi_sense_valid(sshdr))
1374 return 0;
1375
1376 /* not invoked for commands that could return deferred errors */
1377 switch (sshdr->sense_key) {
1378 case UNIT_ATTENTION:
1379 case NOT_READY:
1380 /* medium not present */
1381 if (sshdr->asc == 0x3A) {
1382 set_media_not_present(sdkp);
1383 return 1;
1384 }
1385 }
1386 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387}
1388
1389/**
Tejun Heo2bae0092010-12-18 18:42:23 +01001390 * sd_check_events - check media events
1391 * @disk: kernel device descriptor
1392 * @clearing: disk events currently being cleared
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 *
Tejun Heo2bae0092010-12-18 18:42:23 +01001394 * Returns mask of DISK_EVENT_*.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 *
1396 * Note: this function is invoked from the block subsystem.
1397 **/
Tejun Heo2bae0092010-12-18 18:42:23 +01001398static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399{
1400 struct scsi_disk *sdkp = scsi_disk(disk);
1401 struct scsi_device *sdp = sdkp->device;
James Bottomley001aac22007-12-02 19:10:40 +02001402 struct scsi_sense_hdr *sshdr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 int retval;
1404
Tejun Heo2bae0092010-12-18 18:42:23 +01001405 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406
1407 /*
1408 * If the device is offline, don't send any commands - just pretend as
1409 * if the command failed. If the device ever comes back online, we
1410 * can deal with it then. It is only because of unrecoverable errors
1411 * that we would ever take a device offline in the first place.
1412 */
Kay Sievers285e9672007-08-14 14:10:39 +02001413 if (!scsi_device_online(sdp)) {
1414 set_media_not_present(sdkp);
Kay Sievers285e9672007-08-14 14:10:39 +02001415 goto out;
1416 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
1418 /*
1419 * Using TEST_UNIT_READY enables differentiation between drive with
1420 * no cartridge loaded - NOT READY, drive with changed cartridge -
1421 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1422 *
1423 * Drives that auto spin down. eg iomega jaz 1G, will be started
1424 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1425 * sd_revalidate() is called.
1426 */
1427 retval = -ENODEV;
Kay Sievers285e9672007-08-14 14:10:39 +02001428
James Bottomley001aac22007-12-02 19:10:40 +02001429 if (scsi_block_when_processing_errors(sdp)) {
1430 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1431 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1432 sshdr);
1433 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434
Tejun Heo2bae0092010-12-18 18:42:23 +01001435 /* failed to execute TUR, assume media not present */
1436 if (host_byte(retval)) {
Kay Sievers285e9672007-08-14 14:10:39 +02001437 set_media_not_present(sdkp);
Kay Sievers285e9672007-08-14 14:10:39 +02001438 goto out;
1439 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440
Tejun Heo2bae0092010-12-18 18:42:23 +01001441 if (media_not_present(sdkp, sshdr))
1442 goto out;
1443
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 /*
1445 * For removable scsi disk we have to recognise the presence
Tejun Heo2bae0092010-12-18 18:42:23 +01001446 * of a disk in the drive.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 */
Tejun Heo2bae0092010-12-18 18:42:23 +01001448 if (!sdkp->media_present)
1449 sdp->changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 sdkp->media_present = 1;
Kay Sievers285e9672007-08-14 14:10:39 +02001451out:
Alan Stern3ff55882010-09-07 11:44:01 -04001452 /*
Tejun Heo2bae0092010-12-18 18:42:23 +01001453 * sdp->changed is set under the following conditions:
Alan Stern3ff55882010-09-07 11:44:01 -04001454 *
Tejun Heo2bae0092010-12-18 18:42:23 +01001455 * Medium present state has changed in either direction.
1456 * Device has indicated UNIT_ATTENTION.
Alan Stern3ff55882010-09-07 11:44:01 -04001457 */
James Bottomley001aac22007-12-02 19:10:40 +02001458 kfree(sshdr);
Tejun Heo2bae0092010-12-18 18:42:23 +01001459 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1460 sdp->changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462}
1463
Martin K. Petersene73aec82007-02-27 22:40:55 -05001464static int sd_sync_cache(struct scsi_disk *sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 int retries, res;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001467 struct scsi_device *sdp = sdkp->device;
James Bottomley7e660102013-10-04 21:42:24 +00001468 const int timeout = sdp->request_queue->rq_timeout
1469 * SD_FLUSH_TIMEOUT_MULTIPLIER;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001470 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471
1472 if (!scsi_device_online(sdp))
1473 return -ENODEV;
1474
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 for (retries = 3; retries > 0; --retries) {
1476 unsigned char cmd[10] = { 0 };
1477
1478 cmd[0] = SYNCHRONIZE_CACHE;
1479 /*
1480 * Leave the rest of the command zero to indicate
1481 * flush everything.
1482 */
Lin Ming9b214932013-03-23 11:42:25 +08001483 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
James Bottomley7e660102013-10-04 21:42:24 +00001484 &sshdr, timeout, SD_MAX_RETRIES,
1485 NULL, REQ_PM);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001486 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 break;
1488 }
1489
Martin K. Petersene73aec82007-02-27 22:40:55 -05001490 if (res) {
Hannes Reineckeef613292014-10-24 14:27:00 +02001491 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
Oliver Neukum95897912013-09-16 13:28:15 +02001492
Martin K. Petersene73aec82007-02-27 22:40:55 -05001493 if (driver_byte(res) & DRIVER_SENSE)
1494 sd_print_sense_hdr(sdkp, &sshdr);
Oliver Neukum95897912013-09-16 13:28:15 +02001495 /* we need to evaluate the error return */
1496 if (scsi_sense_valid(&sshdr) &&
Alan Stern7aae5132014-01-15 15:37:04 -05001497 (sshdr.asc == 0x3a || /* medium not present */
1498 sshdr.asc == 0x20)) /* invalid command */
Oliver Neukum95897912013-09-16 13:28:15 +02001499 /* this is no error here */
1500 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501
Oliver Neukum95897912013-09-16 13:28:15 +02001502 switch (host_byte(res)) {
1503 /* ignore errors due to racing a disconnection */
1504 case DID_BAD_TARGET:
1505 case DID_NO_CONNECT:
1506 return 0;
1507 /* signal the upper layer it might try again */
1508 case DID_BUS_BUSY:
1509 case DID_IMM_RETRY:
1510 case DID_REQUEUE:
1511 case DID_SOFT_ERROR:
1512 return -EBUSY;
1513 default:
1514 return -EIO;
1515 }
1516 }
Tejun Heo37210502007-03-21 00:07:18 +09001517 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518}
1519
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520static void sd_rescan(struct device *dev)
1521{
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01001522 struct scsi_disk *sdkp = dev_get_drvdata(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001523
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01001524 revalidate_disk(sdkp->disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525}
1526
1527
1528#ifdef CONFIG_COMPAT
1529/*
1530 * This gets directly called from VFS. When the ioctl
1531 * is not recognized we go back to the other translation paths.
1532 */
Al Viro0338e292008-03-02 10:41:04 -05001533static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1534 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535{
Al Viro0338e292008-03-02 10:41:04 -05001536 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
Christoph Hellwig21a9d4c2014-10-24 18:39:37 +02001537 int error;
Paolo Bonzini0bfc96c2012-01-12 16:01:28 +01001538
Christoph Hellwig21a9d4c2014-10-24 18:39:37 +02001539 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1540 (mode & FMODE_NDELAY) != 0);
1541 if (error)
1542 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 /*
1545 * Let the static ioctl translation table take care of it.
1546 */
Christoph Hellwig21a9d4c2014-10-24 18:39:37 +02001547 if (!sdev->host->hostt->compat_ioctl)
1548 return -ENOIOCTLCMD;
1549 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550}
1551#endif
1552
Christoph Hellwig924d55b2015-10-15 14:10:49 +02001553static char sd_pr_type(enum pr_type type)
1554{
1555 switch (type) {
1556 case PR_WRITE_EXCLUSIVE:
1557 return 0x01;
1558 case PR_EXCLUSIVE_ACCESS:
1559 return 0x03;
1560 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1561 return 0x05;
1562 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1563 return 0x06;
1564 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1565 return 0x07;
1566 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1567 return 0x08;
1568 default:
1569 return 0;
1570 }
1571};
1572
1573static int sd_pr_command(struct block_device *bdev, u8 sa,
1574 u64 key, u64 sa_key, u8 type, u8 flags)
1575{
1576 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1577 struct scsi_sense_hdr sshdr;
1578 int result;
1579 u8 cmd[16] = { 0, };
1580 u8 data[24] = { 0, };
1581
1582 cmd[0] = PERSISTENT_RESERVE_OUT;
1583 cmd[1] = sa;
1584 cmd[2] = type;
1585 put_unaligned_be32(sizeof(data), &cmd[5]);
1586
1587 put_unaligned_be64(key, &data[0]);
1588 put_unaligned_be64(sa_key, &data[8]);
1589 data[20] = flags;
1590
1591 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1592 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1593
1594 if ((driver_byte(result) & DRIVER_SENSE) &&
1595 (scsi_sense_valid(&sshdr))) {
1596 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1597 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1598 }
1599
1600 return result;
1601}
1602
1603static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1604 u32 flags)
1605{
1606 if (flags & ~PR_FL_IGNORE_KEY)
1607 return -EOPNOTSUPP;
1608 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1609 old_key, new_key, 0,
1610 (1 << 0) /* APTPL */ |
1611 (1 << 2) /* ALL_TG_PT */);
1612}
1613
1614static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1615 u32 flags)
1616{
1617 if (flags)
1618 return -EOPNOTSUPP;
1619 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1620}
1621
1622static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1623{
1624 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1625}
1626
1627static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1628 enum pr_type type, bool abort)
1629{
1630 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1631 sd_pr_type(type), 0);
1632}
1633
1634static int sd_pr_clear(struct block_device *bdev, u64 key)
1635{
1636 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1637}
1638
1639static const struct pr_ops sd_pr_ops = {
1640 .pr_register = sd_pr_register,
1641 .pr_reserve = sd_pr_reserve,
1642 .pr_release = sd_pr_release,
1643 .pr_preempt = sd_pr_preempt,
1644 .pr_clear = sd_pr_clear,
1645};
1646
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07001647static const struct block_device_operations sd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 .owner = THIS_MODULE,
Al Viro0338e292008-03-02 10:41:04 -05001649 .open = sd_open,
1650 .release = sd_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001651 .ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001652 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653#ifdef CONFIG_COMPAT
Al Viro0338e292008-03-02 10:41:04 -05001654 .compat_ioctl = sd_compat_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655#endif
Tejun Heo2bae0092010-12-18 18:42:23 +01001656 .check_events = sd_check_events,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657 .revalidate_disk = sd_revalidate_disk,
Tejun Heo72ec24b2010-05-15 20:09:32 +02001658 .unlock_native_capacity = sd_unlock_native_capacity,
Christoph Hellwig924d55b2015-10-15 14:10:49 +02001659 .pr_ops = &sd_pr_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660};
1661
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001662/**
1663 * sd_eh_action - error handling callback
1664 * @scmd: sd-issued command that has failed
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001665 * @eh_disp: The recovery disposition suggested by the midlayer
1666 *
James Bottomley24510792013-11-11 13:44:53 +01001667 * This function is called by the SCSI midlayer upon completion of an
1668 * error test command (currently TEST UNIT READY). The result of sending
1669 * the eh command is passed in eh_disp. We're looking for devices that
1670 * fail medium access commands but are OK with non access commands like
1671 * test unit ready (so wrongly see the device as having a successful
1672 * recovery)
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001673 **/
James Bottomley24510792013-11-11 13:44:53 +01001674static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001675{
1676 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1677
1678 if (!scsi_device_online(scmd->device) ||
James Bottomley24510792013-11-11 13:44:53 +01001679 !scsi_medium_access_command(scmd) ||
1680 host_byte(scmd->result) != DID_TIME_OUT ||
1681 eh_disp != SUCCESS)
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001682 return eh_disp;
1683
1684 /*
1685 * The device has timed out executing a medium access command.
1686 * However, the TEST UNIT READY command sent during error
1687 * handling completed successfully. Either the device is in the
1688 * process of recovering or has it suffered an internal failure
1689 * that prevents access to the storage medium.
1690 */
James Bottomley24510792013-11-11 13:44:53 +01001691 sdkp->medium_access_timed_out++;
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05001692
1693 /*
1694 * If the device keeps failing read/write commands but TEST UNIT
1695 * READY always completes successfully we assume that medium
1696 * access is no longer possible and take the device offline.
1697 */
1698 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1699 scmd_printk(KERN_ERR, scmd,
1700 "Medium access timeout failure. Offlining disk!\n");
1701 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1702
1703 return FAILED;
1704 }
1705
1706 return eh_disp;
1707}
1708
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001709static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1710{
Tejun Heo83096eb2009-05-07 22:24:39 +09001711 u64 start_lba = blk_rq_pos(scmd->request);
1712 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
Mark Hounschell74856fb2015-05-13 10:49:09 +02001713 u64 factor = scmd->device->sector_size / 512;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001714 u64 bad_lba;
1715 int info_valid;
James Bottomleya8733c72010-12-17 15:36:34 -05001716 /*
1717 * resid is optional but mostly filled in. When it's unused,
1718 * its value is zero, so we assume the whole buffer transferred
1719 */
1720 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1721 unsigned int good_bytes;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001722
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001723 if (scmd->request->cmd_type != REQ_TYPE_FS)
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001724 return 0;
1725
1726 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1727 SCSI_SENSE_BUFFERSIZE,
1728 &bad_lba);
1729 if (!info_valid)
1730 return 0;
1731
1732 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1733 return 0;
1734
Mark Hounschell74856fb2015-05-13 10:49:09 +02001735 /* be careful ... don't want any overflows */
1736 do_div(start_lba, factor);
1737 do_div(end_lba, factor);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001738
1739 /* The bad lba was reported incorrectly, we have no idea where
1740 * the error is.
1741 */
1742 if (bad_lba < start_lba || bad_lba >= end_lba)
1743 return 0;
1744
1745 /* This computation should always be done in terms of
1746 * the resolution of the device's medium.
1747 */
James Bottomleya8733c72010-12-17 15:36:34 -05001748 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1749 return min(good_bytes, transferred);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001750}
1751
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752/**
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001753 * sd_done - bottom half handler: called when the lower level
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 * driver has completed (successfully or otherwise) a scsi command.
1755 * @SCpnt: mid-level's per command structure.
1756 *
1757 * Note: potentially run from within an ISR. Must not block.
1758 **/
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001759static int sd_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760{
1761 int result = SCpnt->result;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001762 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 struct scsi_sense_hdr sshdr;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001764 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
Martin K. Petersen26e85fc2012-09-18 12:19:31 -04001765 struct request *req = SCpnt->request;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 int sense_valid = 0;
1767 int sense_deferred = 0;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001768 unsigned char op = SCpnt->cmnd[0];
Martin K. Petersen5db44862012-09-18 12:19:32 -04001769 unsigned char unmap = SCpnt->cmnd[1] & 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770
Martin K. Petersen5db44862012-09-18 12:19:32 -04001771 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
Martin K. Petersen26e85fc2012-09-18 12:19:31 -04001772 if (!result) {
1773 good_bytes = blk_rq_bytes(req);
1774 scsi_set_resid(SCpnt, 0);
1775 } else {
1776 good_bytes = 0;
1777 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1778 }
1779 }
FUJITA Tomonori6a32a8a2010-07-21 10:29:37 +09001780
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 if (result) {
1782 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1783 if (sense_valid)
1784 sense_deferred = scsi_sense_is_deferred(&sshdr);
1785 }
David Jeffery2a863ba2014-04-10 11:08:30 -04001786 sdkp->medium_access_timed_out = 0;
1787
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001788 if (driver_byte(result) != DRIVER_SENSE &&
1789 (!sense_valid || sense_deferred))
1790 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001792 switch (sshdr.sense_key) {
1793 case HARDWARE_ERROR:
1794 case MEDIUM_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001795 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001796 break;
1797 case RECOVERED_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001798 good_bytes = scsi_bufflen(SCpnt);
1799 break;
Jamie Wellnitz10dab222008-09-11 21:39:36 -04001800 case NO_SENSE:
1801 /* This indicates a false check condition, so ignore it. An
1802 * unknown amount of data was transferred so treat it as an
1803 * error.
1804 */
Jamie Wellnitz10dab222008-09-11 21:39:36 -04001805 SCpnt->result = 0;
1806 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1807 break;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001808 case ABORTED_COMMAND:
1809 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001810 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001811 break;
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001812 case ILLEGAL_REQUEST:
1813 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1814 good_bytes = sd_completed_bytes(SCpnt);
1815 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
Martin K. Petersen5db44862012-09-18 12:19:32 -04001816 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1817 switch (op) {
1818 case UNMAP:
1819 sd_config_discard(sdkp, SD_LBP_DISABLE);
1820 break;
1821 case WRITE_SAME_16:
1822 case WRITE_SAME:
1823 if (unmap)
1824 sd_config_discard(sdkp, SD_LBP_DISABLE);
1825 else {
1826 sdkp->device->no_write_same = 1;
1827 sd_config_write_same(sdkp);
1828
1829 good_bytes = 0;
1830 req->__data_len = blk_rq_bytes(req);
1831 req->cmd_flags |= REQ_QUIET;
1832 }
1833 }
1834 }
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05001835 break;
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001836 default:
1837 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001839 out:
Hannes Reineckeef613292014-10-24 14:27:00 +02001840 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1841 "sd_done: completed %d of %d bytes\n",
1842 good_bytes, scsi_bufflen(SCpnt)));
1843
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001844 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1845 sd_dif_complete(SCpnt, good_bytes);
1846
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001847 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848}
1849
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850/*
1851 * spinup disk - called only in sd_revalidate_disk()
1852 */
1853static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001854sd_spinup_disk(struct scsi_disk *sdkp)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001855{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -04001857 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 int retries, spintime;
1859 unsigned int the_result;
1860 struct scsi_sense_hdr sshdr;
1861 int sense_valid = 0;
1862
1863 spintime = 0;
1864
1865 /* Spin up drives, as required. Only do this at boot time */
1866 /* Spinup needs to be done for module loads too. */
1867 do {
1868 retries = 0;
1869
1870 do {
1871 cmd[0] = TEST_UNIT_READY;
1872 memset((void *) &cmd[1], 0, 9);
1873
James Bottomleyea73a9f2005-08-28 11:33:52 -05001874 the_result = scsi_execute_req(sdkp->device, cmd,
1875 DMA_NONE, NULL, 0,
1876 &sshdr, SD_TIMEOUT,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001877 SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878
Alan Sternb4d38e32006-10-11 16:48:28 -04001879 /*
1880 * If the drive has indicated to us that it
1881 * doesn't have any media in it, don't bother
1882 * with any more polling.
1883 */
1884 if (media_not_present(sdkp, &sshdr))
1885 return;
1886
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001888 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 retries++;
1890 } while (retries < 3 &&
1891 (!scsi_status_is_good(the_result) ||
1892 ((driver_byte(the_result) & DRIVER_SENSE) &&
1893 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1894
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1896 /* no sense, TUR either succeeded or failed
1897 * with a status error */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001898 if(!spintime && !scsi_status_is_good(the_result)) {
Hannes Reineckeef613292014-10-24 14:27:00 +02001899 sd_print_result(sdkp, "Test Unit Ready failed",
1900 the_result);
Martin K. Petersene73aec82007-02-27 22:40:55 -05001901 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 break;
1903 }
Hannes Reineckeef613292014-10-24 14:27:00 +02001904
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 /*
1906 * The device does not want the automatic start to be issued.
1907 */
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001908 if (sdkp->device->no_start_on_add)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001911 if (sense_valid && sshdr.sense_key == NOT_READY) {
1912 if (sshdr.asc == 4 && sshdr.ascq == 3)
1913 break; /* manual intervention required */
1914 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1915 break; /* standby */
1916 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1917 break; /* unavailable */
1918 /*
1919 * Issue command to spin up drive when not ready
1920 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 if (!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001922 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 cmd[0] = START_STOP;
1924 cmd[1] = 1; /* Return immediately */
1925 memset((void *) &cmd[2], 0, 8);
1926 cmd[4] = 1; /* Start spin cycle */
Stefan Richterd2886ea2008-05-11 00:34:07 +02001927 if (sdkp->device->start_stop_pwr_cond)
1928 cmd[4] |= 1 << 4;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001929 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1930 NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001931 SD_TIMEOUT, SD_MAX_RETRIES,
1932 NULL);
Alan Stern4451e472005-07-12 10:45:17 -04001933 spintime_expire = jiffies + 100 * HZ;
1934 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 /* Wait 1 second for next try */
1937 msleep(1000);
1938 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001939
1940 /*
1941 * Wait for USB flash devices with slow firmware.
1942 * Yes, this sense key/ASC combination shouldn't
1943 * occur here. It's characteristic of these devices.
1944 */
1945 } else if (sense_valid &&
1946 sshdr.sense_key == UNIT_ATTENTION &&
1947 sshdr.asc == 0x28) {
1948 if (!spintime) {
1949 spintime_expire = jiffies + 5 * HZ;
1950 spintime = 1;
1951 }
1952 /* Wait 1 second for next try */
1953 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 } else {
1955 /* we don't understand the sense code, so it's
1956 * probably pointless to loop */
1957 if(!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001958 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1959 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960 }
1961 break;
1962 }
1963
Alan Stern4451e472005-07-12 10:45:17 -04001964 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965
1966 if (spintime) {
1967 if (scsi_status_is_good(the_result))
1968 printk("ready\n");
1969 else
1970 printk("not responding...\n");
1971 }
1972}
1973
Martin K. Petersene0597d72008-07-17 04:28:34 -04001974
1975/*
1976 * Determine whether disk supports Data Integrity Field.
1977 */
Martin K. Petersenfe542392012-09-21 12:44:12 -04001978static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04001979{
1980 struct scsi_device *sdp = sdkp->device;
1981 u8 type;
Martin K. Petersenfe542392012-09-21 12:44:12 -04001982 int ret = 0;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001983
1984 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
Martin K. Petersenfe542392012-09-21 12:44:12 -04001985 return ret;
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001986
1987 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1988
Martin K. Petersenfe542392012-09-21 12:44:12 -04001989 if (type > SD_DIF_TYPE3_PROTECTION)
1990 ret = -ENODEV;
1991 else if (scsi_host_dif_capable(sdp->host, type))
1992 ret = 1;
1993
1994 if (sdkp->first_scan || type != sdkp->protection_type)
1995 switch (ret) {
1996 case -ENODEV:
1997 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1998 " protection type %u. Disabling disk!\n",
1999 type);
2000 break;
2001 case 1:
2002 sd_printk(KERN_NOTICE, sdkp,
2003 "Enabling DIF Type %u protection\n", type);
2004 break;
2005 case 0:
2006 sd_printk(KERN_NOTICE, sdkp,
2007 "Disabling DIF Type %u protection\n", type);
2008 break;
2009 }
Martin K. Petersene0597d72008-07-17 04:28:34 -04002010
Martin K. Petersenbe922f42008-09-19 18:47:20 -04002011 sdkp->protection_type = type;
2012
Martin K. Petersenfe542392012-09-21 12:44:12 -04002013 return ret;
Martin K. Petersene0597d72008-07-17 04:28:34 -04002014}
2015
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002016static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2017 struct scsi_sense_hdr *sshdr, int sense_valid,
2018 int the_result)
2019{
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002020 if (driver_byte(the_result) & DRIVER_SENSE)
2021 sd_print_sense_hdr(sdkp, sshdr);
2022 else
2023 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2024
2025 /*
2026 * Set dirty bit for removable devices if not ready -
2027 * sometimes drives will not report this properly.
2028 */
2029 if (sdp->removable &&
2030 sense_valid && sshdr->sense_key == NOT_READY)
Tejun Heo2bae0092010-12-18 18:42:23 +01002031 set_media_not_present(sdkp);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002032
2033 /*
2034 * We used to set media_present to 0 here to indicate no media
2035 * in the drive, but some drives fail read capacity even with
2036 * media present, so we can't do that.
2037 */
2038 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2039}
2040
2041#define RC16_LEN 32
2042#if RC16_LEN > SD_BUF_SIZE
2043#error RC16_LEN must not be more than SD_BUF_SIZE
2044#endif
2045
James Bottomley3233ac12010-04-01 10:30:01 -04002046#define READ_CAPACITY_RETRIES_ON_RESET 10
2047
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002048static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2049 unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05002050{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 struct scsi_sense_hdr sshdr;
2053 int sense_valid = 0;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002054 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04002055 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002056 unsigned int alignment;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002057 unsigned long long lba;
2058 unsigned sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059
Hans de Goede5ce524b2010-10-01 14:20:10 -07002060 if (sdp->no_read_capacity_16)
2061 return -EINVAL;
2062
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 do {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002064 memset(cmd, 0, 16);
Hannes Reineckeeb846d92014-11-17 14:25:19 +01002065 cmd[0] = SERVICE_ACTION_IN_16;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002066 cmd[1] = SAI_READ_CAPACITY_16;
2067 cmd[13] = RC16_LEN;
2068 memset(buffer, 0, RC16_LEN);
2069
James Bottomleyea73a9f2005-08-28 11:33:52 -05002070 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002071 buffer, RC16_LEN, &sshdr,
2072 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073
James Bottomleyea73a9f2005-08-28 11:33:52 -05002074 if (media_not_present(sdkp, &sshdr))
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002075 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002076
Matthew Wilcox2b301302009-03-12 14:20:30 -04002077 if (the_result) {
James Bottomleyea73a9f2005-08-28 11:33:52 -05002078 sense_valid = scsi_sense_valid(&sshdr);
Matthew Wilcox2b301302009-03-12 14:20:30 -04002079 if (sense_valid &&
2080 sshdr.sense_key == ILLEGAL_REQUEST &&
2081 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2082 sshdr.ascq == 0x00)
2083 /* Invalid Command Operation Code or
2084 * Invalid Field in CDB, just retry
2085 * silently with RC10 */
2086 return -EINVAL;
James Bottomley3233ac12010-04-01 10:30:01 -04002087 if (sense_valid &&
2088 sshdr.sense_key == UNIT_ATTENTION &&
2089 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2090 /* Device reset might occur several times,
2091 * give it one more chance */
2092 if (--reset_retries > 0)
2093 continue;
Matthew Wilcox2b301302009-03-12 14:20:30 -04002094 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095 retries--;
2096
2097 } while (the_result && retries);
2098
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002099 if (the_result) {
Hannes Reineckeef613292014-10-24 14:27:00 +02002100 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002101 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2102 return -EINVAL;
2103 }
Martin K. Petersene73aec82007-02-27 22:40:55 -05002104
Dave Hansen8f76d152009-04-21 16:43:27 -07002105 sector_size = get_unaligned_be32(&buffer[8]);
2106 lba = get_unaligned_be64(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002107
Martin K. Petersenfe542392012-09-21 12:44:12 -04002108 if (sd_read_protection_type(sdkp, buffer) < 0) {
2109 sdkp->capacity = 0;
2110 return -ENODEV;
2111 }
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002112
2113 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2114 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2115 "kernel compiled with support for large block "
2116 "devices.\n");
2117 sdkp->capacity = 0;
2118 return -EOVERFLOW;
2119 }
2120
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002121 /* Logical blocks per physical block exponent */
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002122 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002123
2124 /* Lowest aligned logical block */
2125 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2126 blk_queue_alignment_offset(sdp->request_queue, alignment);
2127 if (alignment && sdkp->first_scan)
2128 sd_printk(KERN_NOTICE, sdkp,
2129 "physical block alignment offset: %u\n", alignment);
2130
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002131 if (buffer[14] & 0x80) { /* LBPME */
2132 sdkp->lbpme = 1;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002133
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002134 if (buffer[14] & 0x40) /* LBPRZ */
2135 sdkp->lbprz = 1;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002136
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002137 sd_config_discard(sdkp, SD_LBP_WS16);
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002138 }
2139
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002140 sdkp->capacity = lba + 1;
2141 return sector_size;
2142}
2143
2144static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2145 unsigned char *buffer)
2146{
2147 unsigned char cmd[16];
2148 struct scsi_sense_hdr sshdr;
2149 int sense_valid = 0;
2150 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04002151 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002152 sector_t lba;
2153 unsigned sector_size;
2154
2155 do {
2156 cmd[0] = READ_CAPACITY;
2157 memset(&cmd[1], 0, 9);
2158 memset(buffer, 0, 8);
2159
2160 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2161 buffer, 8, &sshdr,
2162 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2163
2164 if (media_not_present(sdkp, &sshdr))
2165 return -ENODEV;
2166
James Bottomley3233ac12010-04-01 10:30:01 -04002167 if (the_result) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002168 sense_valid = scsi_sense_valid(&sshdr);
James Bottomley3233ac12010-04-01 10:30:01 -04002169 if (sense_valid &&
2170 sshdr.sense_key == UNIT_ATTENTION &&
2171 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2172 /* Device reset might occur several times,
2173 * give it one more chance */
2174 if (--reset_retries > 0)
2175 continue;
2176 }
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002177 retries--;
2178
2179 } while (the_result && retries);
2180
2181 if (the_result) {
Hannes Reineckeef613292014-10-24 14:27:00 +02002182 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002183 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2184 return -EINVAL;
2185 }
2186
Dave Hansen8f76d152009-04-21 16:43:27 -07002187 sector_size = get_unaligned_be32(&buffer[4]);
2188 lba = get_unaligned_be32(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002189
Hans de Goede5ce524b2010-10-01 14:20:10 -07002190 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2191 /* Some buggy (usb cardreader) devices return an lba of
2192 0xffffffff when the want to report a size of 0 (with
2193 which they really mean no media is present) */
2194 sdkp->capacity = 0;
Linus Torvalds5cc10352010-10-22 20:30:48 -07002195 sdkp->physical_block_size = sector_size;
Hans de Goede5ce524b2010-10-01 14:20:10 -07002196 return sector_size;
2197 }
2198
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002199 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2200 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2201 "kernel compiled with support for large block "
2202 "devices.\n");
2203 sdkp->capacity = 0;
2204 return -EOVERFLOW;
2205 }
2206
2207 sdkp->capacity = lba + 1;
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002208 sdkp->physical_block_size = sector_size;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002209 return sector_size;
2210}
2211
Matthew Wilcox2b301302009-03-12 14:20:30 -04002212static int sd_try_rc16_first(struct scsi_device *sdp)
2213{
Hannes Reineckef87146b2010-03-29 09:29:24 +02002214 if (sdp->host->max_cmd_len < 16)
2215 return 0;
Alan Stern6a0bdff2012-06-20 16:04:19 -04002216 if (sdp->try_rc_10_first)
2217 return 0;
Matthew Wilcox2b301302009-03-12 14:20:30 -04002218 if (sdp->scsi_level > SCSI_SPC_2)
2219 return 1;
2220 if (scsi_device_protection(sdp))
2221 return 1;
2222 return 0;
2223}
2224
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002225/*
2226 * read disk capacity
2227 */
2228static void
2229sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2230{
2231 int sector_size;
2232 struct scsi_device *sdp = sdkp->device;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002233 sector_t old_capacity = sdkp->capacity;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002234
Matthew Wilcox2b301302009-03-12 14:20:30 -04002235 if (sd_try_rc16_first(sdp)) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002236 sector_size = read_capacity_16(sdkp, sdp, buffer);
2237 if (sector_size == -EOVERFLOW)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238 goto got_data;
Matthew Wilcox2b301302009-03-12 14:20:30 -04002239 if (sector_size == -ENODEV)
2240 return;
2241 if (sector_size < 0)
2242 sector_size = read_capacity_10(sdkp, sdp, buffer);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002243 if (sector_size < 0)
2244 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245 } else {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04002246 sector_size = read_capacity_10(sdkp, sdp, buffer);
2247 if (sector_size == -EOVERFLOW)
2248 goto got_data;
2249 if (sector_size < 0)
2250 return;
2251 if ((sizeof(sdkp->capacity) > 4) &&
2252 (sdkp->capacity > 0xffffffffULL)) {
2253 int old_sector_size = sector_size;
2254 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2255 "Trying to use READ CAPACITY(16).\n");
2256 sector_size = read_capacity_16(sdkp, sdp, buffer);
2257 if (sector_size < 0) {
2258 sd_printk(KERN_NOTICE, sdkp,
2259 "Using 0xffffffff as device size\n");
2260 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2261 sector_size = old_sector_size;
2262 goto got_data;
2263 }
2264 }
2265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266
Alan Stern5c211ca2009-02-18 10:54:44 -05002267 /* Some devices are known to return the total number of blocks,
2268 * not the highest block number. Some devices have versions
2269 * which do this and others which do not. Some devices we might
2270 * suspect of doing this but we don't know for certain.
2271 *
2272 * If we know the reported capacity is wrong, decrement it. If
2273 * we can only guess, then assume the number of blocks is even
2274 * (usually true but not always) and err on the side of lowering
2275 * the capacity.
2276 */
2277 if (sdp->fix_capacity ||
2278 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2279 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2280 "from its reported value: %llu\n",
2281 (unsigned long long) sdkp->capacity);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 --sdkp->capacity;
Oliver Neukum61bf54b2007-02-08 09:04:48 +01002283 }
2284
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285got_data:
2286 if (sector_size == 0) {
2287 sector_size = 512;
Martin K. Petersene73aec82007-02-27 22:40:55 -05002288 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2289 "assuming 512.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 }
2291
2292 if (sector_size != 512 &&
2293 sector_size != 1024 &&
2294 sector_size != 2048 &&
Mark Hounschell74856fb2015-05-13 10:49:09 +02002295 sector_size != 4096) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002296 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2297 sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298 /*
2299 * The user might want to re-format the drive with
2300 * a supported sectorsize. Once this happens, it
2301 * would be relatively trivial to set the thing up.
2302 * For this reason, we leave the thing in the table.
2303 */
2304 sdkp->capacity = 0;
2305 /*
2306 * set a bogus sector size so the normal read/write
2307 * logic in the block layer will eventually refuse any
2308 * request on this device without tripping over power
2309 * of two sector size assumptions
2310 */
2311 sector_size = 512;
2312 }
Martin K. Petersene1defc42009-05-22 17:17:49 -04002313 blk_queue_logical_block_size(sdp->request_queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314
James Bottomley7404ad3b2008-08-31 10:41:52 -05002315 {
2316 char cap_str_2[10], cap_str_10[10];
James Bottomley7404ad3b2008-08-31 10:41:52 -05002317
James Bottomleyb9f28d82015-03-05 18:47:01 -08002318 string_get_size(sdkp->capacity, sector_size,
2319 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2320 string_get_size(sdkp->capacity, sector_size,
2321 STRING_UNITS_10, cap_str_10,
James Bottomley7404ad3b2008-08-31 10:41:52 -05002322 sizeof(cap_str_10));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002324 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002325 sd_printk(KERN_NOTICE, sdkp,
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002326 "%llu %d-byte logical blocks: (%s/%s)\n",
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002327 (unsigned long long)sdkp->capacity,
2328 sector_size, cap_str_10, cap_str_2);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002329
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002330 if (sdkp->physical_block_size != sector_size)
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002331 sd_printk(KERN_NOTICE, sdkp,
2332 "%u-byte physical blocks\n",
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002333 sdkp->physical_block_size);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04002334 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002335 }
2336
Martin K. Petersenca369d52015-11-13 16:46:48 -05002337 if (sdkp->capacity > 0xffffffff)
Martin K. Petersenbcdb2472014-06-03 18:45:51 -04002338 sdp->use_16_for_rw = 1;
Jason J. Herne53ad5702012-11-14 17:03:22 -05002339
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 /* Rescale capacity to 512-byte units */
2341 if (sector_size == 4096)
2342 sdkp->capacity <<= 3;
2343 else if (sector_size == 2048)
2344 sdkp->capacity <<= 2;
2345 else if (sector_size == 1024)
2346 sdkp->capacity <<= 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347
Martin K. Petersen526f7c72010-09-28 14:48:47 -04002348 blk_queue_physical_block_size(sdp->request_queue,
2349 sdkp->physical_block_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002350 sdkp->device->sector_size = sector_size;
2351}
2352
2353/* called with buffer of length 512 */
2354static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05002355sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2356 unsigned char *buffer, int len, struct scsi_mode_data *data,
2357 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358{
James Bottomleyea73a9f2005-08-28 11:33:52 -05002359 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05002360 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05002361 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362}
2363
2364/*
2365 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06002366 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 */
2368static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05002369sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05002370{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05002372 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 struct scsi_mode_data data;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002374 int old_wp = sdkp->write_prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002375
2376 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05002377 if (sdp->skip_ms_page_3f) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002378 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379 return;
2380 }
2381
James Bottomleyea73a9f2005-08-28 11:33:52 -05002382 if (sdp->use_192_bytes_for_3f) {
2383 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384 } else {
2385 /*
2386 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2387 * We have to start carefully: some devices hang if we ask
2388 * for more than is available.
2389 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05002390 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391
2392 /*
2393 * Second attempt: ask for page 0 When only page 0 is
2394 * implemented, a request for page 3F may return Sense Key
2395 * 5: Illegal Request, Sense Code 24: Invalid field in
2396 * CDB.
2397 */
2398 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05002399 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002400
2401 /*
2402 * Third attempt: ask 255 bytes, as we did earlier.
2403 */
2404 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05002405 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2406 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002407 }
2408
2409 if (!scsi_status_is_good(res)) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002410 sd_first_printk(KERN_WARNING, sdkp,
Martin K. Petersene73aec82007-02-27 22:40:55 -05002411 "Test WP failed, assume Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002412 } else {
2413 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2414 set_disk_ro(sdkp->disk, sdkp->write_prot);
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002415 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2416 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2417 sdkp->write_prot ? "on" : "off");
2418 sd_printk(KERN_DEBUG, sdkp,
2419 "Mode Sense: %02x %02x %02x %02x\n",
2420 buffer[0], buffer[1], buffer[2], buffer[3]);
2421 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002422 }
2423}
2424
2425/*
2426 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06002427 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 */
2429static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05002430sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01002431{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002432 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05002433 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434
Al Viro 631e8a12005-05-16 01:59:55 +01002435 int dbd;
2436 int modepage;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002437 int first_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 struct scsi_mode_data data;
2439 struct scsi_sense_hdr sshdr;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002440 int old_wce = sdkp->WCE;
2441 int old_rcd = sdkp->RCD;
2442 int old_dpofua = sdkp->DPOFUA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443
James Bottomley39c60a02013-04-24 14:02:53 -07002444
2445 if (sdkp->cache_override)
2446 return;
2447
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002448 first_len = 4;
2449 if (sdp->skip_ms_page_8) {
2450 if (sdp->type == TYPE_RBC)
2451 goto defaults;
2452 else {
2453 if (sdp->skip_ms_page_3f)
2454 goto defaults;
2455 modepage = 0x3F;
2456 if (sdp->use_192_bytes_for_3f)
2457 first_len = 192;
2458 dbd = 0;
2459 }
2460 } else if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01002461 modepage = 6;
2462 dbd = 8;
2463 } else {
2464 modepage = 8;
2465 dbd = 0;
2466 }
2467
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468 /* cautiously ask */
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002469 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2470 &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002471
2472 if (!scsi_status_is_good(res))
2473 goto bad_sense;
2474
Al Viro6d73c852006-02-23 02:03:16 +01002475 if (!data.header_length) {
2476 modepage = 6;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002477 first_len = 0;
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002478 sd_first_printk(KERN_ERR, sdkp,
2479 "Missing header in MODE_SENSE response\n");
Al Viro6d73c852006-02-23 02:03:16 +01002480 }
2481
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 /* that went OK, now ask for the proper length */
2483 len = data.length;
2484
2485 /*
2486 * We're only interested in the first three bytes, actually.
2487 * But the data cache page is defined for the first 20.
2488 */
2489 if (len < 3)
2490 goto bad_sense;
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002491 else if (len > SD_BUF_SIZE) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002492 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002493 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2494 len = SD_BUF_SIZE;
2495 }
2496 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2497 len = 192;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498
2499 /* Get the data */
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002500 if (len > first_len)
2501 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2502 &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503
2504 if (scsi_status_is_good(res)) {
Al Viro 631e8a12005-05-16 01:59:55 +01002505 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002506
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002507 while (offset < len) {
2508 u8 page_code = buffer[offset] & 0x3F;
2509 u8 spf = buffer[offset] & 0x40;
2510
2511 if (page_code == 8 || page_code == 6) {
2512 /* We're interested only in the first 3 bytes.
2513 */
2514 if (len - offset <= 2) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002515 sd_first_printk(KERN_ERR, sdkp,
2516 "Incomplete mode parameter "
2517 "data\n");
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002518 goto defaults;
2519 } else {
2520 modepage = page_code;
2521 goto Page_found;
2522 }
2523 } else {
2524 /* Go to the next page */
2525 if (spf && len - offset > 3)
2526 offset += 4 + (buffer[offset+2] << 8) +
2527 buffer[offset+3];
2528 else if (!spf && len - offset > 1)
2529 offset += 2 + buffer[offset+1];
2530 else {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002531 sd_first_printk(KERN_ERR, sdkp,
2532 "Incomplete mode "
2533 "parameter data\n");
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002534 goto defaults;
2535 }
2536 }
Al Viro48970802006-02-26 08:34:10 -06002537 }
2538
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002539 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
Alan Stern984f1732013-09-06 11:49:51 -04002540 goto defaults;
2541
Luben Tuikov0bcaa112011-05-19 00:00:58 -07002542 Page_found:
Al Viro 631e8a12005-05-16 01:59:55 +01002543 if (modepage == 8) {
2544 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2545 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2546 } else {
2547 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2548 sdkp->RCD = 0;
2549 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002550
Tejun Heo007365a2006-01-06 09:53:52 +01002551 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
Alan Sternb14bf2d2014-06-30 11:04:21 -04002552 if (sdp->broken_fua) {
2553 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2554 sdkp->DPOFUA = 0;
2555 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002556 sd_first_printk(KERN_NOTICE, sdkp,
Martin K. Petersene73aec82007-02-27 22:40:55 -05002557 "Uses READ/WRITE(6), disabling FUA\n");
Tejun Heo007365a2006-01-06 09:53:52 +01002558 sdkp->DPOFUA = 0;
2559 }
2560
Sujit Reddy Thumma2eefd572014-08-11 15:40:37 +03002561 /* No cache flush allowed for write protected devices */
2562 if (sdkp->WCE && sdkp->write_prot)
2563 sdkp->WCE = 0;
2564
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002565 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2566 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2567 sd_printk(KERN_NOTICE, sdkp,
2568 "Write cache: %s, read cache: %s, %s\n",
2569 sdkp->WCE ? "enabled" : "disabled",
2570 sdkp->RCD ? "disabled" : "enabled",
2571 sdkp->DPOFUA ? "supports DPO and FUA"
2572 : "doesn't support DPO or FUA");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573
2574 return;
2575 }
2576
2577bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05002578 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002579 sshdr.sense_key == ILLEGAL_REQUEST &&
2580 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
Martin K. Petersene73aec82007-02-27 22:40:55 -05002581 /* Invalid field in CDB */
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002582 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583 else
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002584 sd_first_printk(KERN_ERR, sdkp,
2585 "Asking for cache data failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586
2587defaults:
Namjae Jeonb81478d2012-07-07 23:05:08 -04002588 if (sdp->wce_default_on) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002589 sd_first_printk(KERN_NOTICE, sdkp,
2590 "Assuming drive cache: write back\n");
Namjae Jeonb81478d2012-07-07 23:05:08 -04002591 sdkp->WCE = 1;
2592 } else {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002593 sd_first_printk(KERN_ERR, sdkp,
2594 "Assuming drive cache: write through\n");
Namjae Jeonb81478d2012-07-07 23:05:08 -04002595 sdkp->WCE = 0;
2596 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06002598 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599}
2600
Martin K. Petersene0597d72008-07-17 04:28:34 -04002601/*
2602 * The ATO bit indicates whether the DIF application tag is available
2603 * for use by the operating system.
2604 */
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07002605static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04002606{
2607 int res, offset;
2608 struct scsi_device *sdp = sdkp->device;
2609 struct scsi_mode_data data;
2610 struct scsi_sense_hdr sshdr;
2611
2612 if (sdp->type != TYPE_DISK)
2613 return;
2614
2615 if (sdkp->protection_type == 0)
2616 return;
2617
2618 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2619 SD_MAX_RETRIES, &data, &sshdr);
2620
2621 if (!scsi_status_is_good(res) || !data.header_length ||
2622 data.length < 6) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002623 sd_first_printk(KERN_WARNING, sdkp,
Martin K. Petersene0597d72008-07-17 04:28:34 -04002624 "getting Control mode page failed, assume no ATO\n");
2625
2626 if (scsi_sense_valid(&sshdr))
2627 sd_print_sense_hdr(sdkp, &sshdr);
2628
2629 return;
2630 }
2631
2632 offset = data.header_length + data.block_descriptor_length;
2633
2634 if ((buffer[offset] & 0x3f) != 0x0a) {
Martin K. Petersenb2bff6c2014-01-03 18:19:26 -05002635 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
Martin K. Petersene0597d72008-07-17 04:28:34 -04002636 return;
2637 }
2638
2639 if ((buffer[offset + 5] & 0x80) == 0)
2640 return;
2641
2642 sdkp->ATO = 1;
2643
2644 return;
2645}
2646
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647/**
Martin K. Petersend11b6912009-05-23 11:43:39 -04002648 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2649 * @disk: disk to query
2650 */
2651static void sd_read_block_limits(struct scsi_disk *sdkp)
2652{
2653 unsigned int sector_sz = sdkp->device->sector_size;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002654 const int vpd_len = 64;
James Bottomleye3deec02009-11-03 12:33:07 -06002655 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersend11b6912009-05-23 11:43:39 -04002656
James Bottomleye3deec02009-11-03 12:33:07 -06002657 if (!buffer ||
2658 /* Block Limits VPD */
2659 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2660 goto out;
Martin K. Petersend11b6912009-05-23 11:43:39 -04002661
2662 blk_queue_io_min(sdkp->disk->queue,
2663 get_unaligned_be16(&buffer[6]) * sector_sz);
Martin K. Petersenca369d52015-11-13 16:46:48 -05002664
2665 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2666 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
Martin K. Petersend11b6912009-05-23 11:43:39 -04002667
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002668 if (buffer[3] == 0x3c) {
2669 unsigned int lba_count, desc_count;
2670
Martin K. Petersen5db44862012-09-18 12:19:32 -04002671 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002672
2673 if (!sdkp->lbpme)
2674 goto out;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002675
2676 lba_count = get_unaligned_be32(&buffer[20]);
2677 desc_count = get_unaligned_be32(&buffer[24]);
2678
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002679 if (lba_count && desc_count)
2680 sdkp->max_unmap_blocks = lba_count;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002681
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002682 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002683
2684 if (buffer[32] & 0x80)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002685 sdkp->unmap_alignment =
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002686 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002687
2688 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2689
2690 if (sdkp->max_unmap_blocks)
2691 sd_config_discard(sdkp, SD_LBP_UNMAP);
2692 else
2693 sd_config_discard(sdkp, SD_LBP_WS16);
2694
2695 } else { /* LBP VPD page tells us what to use */
Martin K. Petersene4613382014-12-05 08:58:03 -05002696 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2697 sd_config_discard(sdkp, SD_LBP_UNMAP);
2698 else if (sdkp->lbpws)
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002699 sd_config_discard(sdkp, SD_LBP_WS16);
2700 else if (sdkp->lbpws10)
2701 sd_config_discard(sdkp, SD_LBP_WS10);
Martin K. Petersen79850902014-11-07 00:08:13 -05002702 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2703 sd_config_discard(sdkp, SD_LBP_UNMAP);
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002704 else
2705 sd_config_discard(sdkp, SD_LBP_DISABLE);
2706 }
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002707 }
2708
James Bottomleye3deec02009-11-03 12:33:07 -06002709 out:
Martin K. Petersend11b6912009-05-23 11:43:39 -04002710 kfree(buffer);
2711}
2712
2713/**
Martin K. Petersen3821d762009-05-23 11:43:38 -04002714 * sd_read_block_characteristics - Query block dev. characteristics
2715 * @disk: disk to query
2716 */
2717static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2718{
James Bottomleye3deec02009-11-03 12:33:07 -06002719 unsigned char *buffer;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002720 u16 rot;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002721 const int vpd_len = 64;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002722
James Bottomleye3deec02009-11-03 12:33:07 -06002723 buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersen3821d762009-05-23 11:43:38 -04002724
James Bottomleye3deec02009-11-03 12:33:07 -06002725 if (!buffer ||
2726 /* Block Device Characteristics VPD */
2727 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2728 goto out;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002729
2730 rot = get_unaligned_be16(&buffer[4]);
2731
Mike Snitzerb277da02014-10-04 10:55:32 -06002732 if (rot == 1) {
Martin K. Petersen3821d762009-05-23 11:43:38 -04002733 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
Mike Snitzerb277da02014-10-04 10:55:32 -06002734 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2735 }
Martin K. Petersen3821d762009-05-23 11:43:38 -04002736
James Bottomleye3deec02009-11-03 12:33:07 -06002737 out:
Martin K. Petersen3821d762009-05-23 11:43:38 -04002738 kfree(buffer);
2739}
2740
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002741/**
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002742 * sd_read_block_provisioning - Query provisioning VPD page
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002743 * @disk: disk to query
2744 */
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002745static void sd_read_block_provisioning(struct scsi_disk *sdkp)
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002746{
2747 unsigned char *buffer;
2748 const int vpd_len = 8;
2749
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002750 if (sdkp->lbpme == 0)
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002751 return;
2752
2753 buffer = kmalloc(vpd_len, GFP_KERNEL);
2754
2755 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2756 goto out;
2757
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002758 sdkp->lbpvpd = 1;
2759 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2760 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2761 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002762
2763 out:
2764 kfree(buffer);
2765}
2766
Martin K. Petersen5db44862012-09-18 12:19:32 -04002767static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2768{
Martin K. Petersen66c28f92013-06-06 22:15:55 -04002769 struct scsi_device *sdev = sdkp->device;
2770
Martin K. Petersen54b2b502013-10-23 06:25:40 -04002771 if (sdev->host->no_write_same) {
2772 sdev->no_write_same = 1;
2773
2774 return;
2775 }
2776
Martin K. Petersen66c28f92013-06-06 22:15:55 -04002777 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
Bernd Schubertaf736232013-09-23 14:47:32 +02002778 /* too large values might cause issues with arcmsr */
2779 int vpd_buf_len = 64;
2780
Martin K. Petersen66c28f92013-06-06 22:15:55 -04002781 sdev->no_report_opcodes = 1;
2782
2783 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2784 * CODES is unsupported and the device has an ATA
2785 * Information VPD page (SAT).
2786 */
Bernd Schubertaf736232013-09-23 14:47:32 +02002787 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
Martin K. Petersen66c28f92013-06-06 22:15:55 -04002788 sdev->no_write_same = 1;
2789 }
2790
2791 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
Martin K. Petersen5db44862012-09-18 12:19:32 -04002792 sdkp->ws16 = 1;
Martin K. Petersen66c28f92013-06-06 22:15:55 -04002793
2794 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2795 sdkp->ws10 = 1;
Martin K. Petersen5db44862012-09-18 12:19:32 -04002796}
2797
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002798static int sd_try_extended_inquiry(struct scsi_device *sdp)
2799{
Martin K. Petersenc1d40a52014-07-15 12:49:17 -04002800 /* Attempt VPD inquiry if the device blacklist explicitly calls
2801 * for it.
2802 */
2803 if (sdp->try_vpd_pages)
2804 return 1;
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002805 /*
2806 * Although VPD inquiries can go to SCSI-2 type devices,
2807 * some USB ones crash on receiving them, and the pages
2808 * we currently ask for are for SPC-3 and beyond
2809 */
Alan Stern09b6b512012-01-10 13:43:30 -05002810 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002811 return 1;
2812 return 0;
2813}
2814
Martin K. Petersenca369d52015-11-13 16:46:48 -05002815static inline u32 logical_to_sectors(struct scsi_device *sdev, u32 blocks)
2816{
2817 return blocks << (ilog2(sdev->sector_size) - 9);
2818}
2819
Martin K. Petersen3821d762009-05-23 11:43:38 -04002820/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821 * sd_revalidate_disk - called the first time a new disk is seen,
2822 * performs disk spin up, read_capacity, etc.
2823 * @disk: struct gendisk we care about
2824 **/
2825static int sd_revalidate_disk(struct gendisk *disk)
2826{
2827 struct scsi_disk *sdkp = scsi_disk(disk);
2828 struct scsi_device *sdp = sdkp->device;
Martin K. Petersenca369d52015-11-13 16:46:48 -05002829 struct request_queue *q = sdkp->disk->queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002830 unsigned char *buffer;
Martin K. Petersenca369d52015-11-13 16:46:48 -05002831 unsigned int dev_max, rw_max;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05002833 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2834 "sd_revalidate_disk\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002835
2836 /*
2837 * If the device is offline, don't try and read capacity or any
2838 * of the other niceties.
2839 */
2840 if (!scsi_device_online(sdp))
2841 goto out;
2842
Bernhard Wallea6123f12007-05-21 17:15:26 +02002843 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002844 if (!buffer) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002845 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2846 "allocation failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05002847 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002848 }
2849
Martin K. Petersene73aec82007-02-27 22:40:55 -05002850 sd_spinup_disk(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002851
2852 /*
2853 * Without media there is no reason to ask; moreover, some devices
2854 * react badly if we do.
2855 */
2856 if (sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002857 sd_read_capacity(sdkp, buffer);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002858
2859 if (sd_try_extended_inquiry(sdp)) {
Martin K. Petersenc98a0eb2011-03-08 02:07:15 -05002860 sd_read_block_provisioning(sdkp);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002861 sd_read_block_limits(sdkp);
2862 sd_read_block_characteristics(sdkp);
2863 }
2864
Martin K. Petersene73aec82007-02-27 22:40:55 -05002865 sd_read_write_protect_flag(sdkp, buffer);
2866 sd_read_cache_type(sdkp, buffer);
Martin K. Petersene0597d72008-07-17 04:28:34 -04002867 sd_read_app_tag_own(sdkp, buffer);
Martin K. Petersen5db44862012-09-18 12:19:32 -04002868 sd_read_write_same(sdkp, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869 }
Tejun Heo461d4e92006-01-06 09:52:55 +01002870
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002871 sdkp->first_scan = 0;
2872
Tejun Heo461d4e92006-01-06 09:52:55 +01002873 /*
2874 * We now have all cache related info, determine how we deal
Tejun Heo4913efe2010-09-03 11:56:16 +02002875 * with flush requests.
Tejun Heo461d4e92006-01-06 09:52:55 +01002876 */
Vaughan Caocb2fb682014-06-03 17:37:30 +08002877 sd_set_flush_flag(sdkp);
Tejun Heo461d4e92006-01-06 09:52:55 +01002878
Martin K. Petersenca369d52015-11-13 16:46:48 -05002879 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2880 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
Brian King3a9794d2015-01-29 15:54:40 -06002881
Martin K. Petersenca369d52015-11-13 16:46:48 -05002882 /* Some devices report a maximum block count for READ/WRITE requests. */
2883 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2884 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2885
2886 /*
2887 * Use the device's preferred I/O size for reads and writes
2888 * unless the reported value is unreasonably large (or garbage).
2889 */
2890 if (sdkp->opt_xfer_blocks && sdkp->opt_xfer_blocks <= dev_max &&
2891 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS)
2892 rw_max = q->limits.io_opt =
2893 logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2894 else
2895 rw_max = BLK_DEF_MAX_SECTORS;
2896
2897 /* Combine with controller limits */
2898 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
Martin K. Petersen4f258a42015-06-23 12:13:59 -04002899
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 set_capacity(disk, sdkp->capacity);
Martin K. Petersen5db44862012-09-18 12:19:32 -04002901 sd_config_write_same(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902 kfree(buffer);
2903
Linus Torvalds1da177e2005-04-16 15:20:36 -07002904 out:
2905 return 0;
2906}
2907
2908/**
Tejun Heo72ec24b2010-05-15 20:09:32 +02002909 * sd_unlock_native_capacity - unlock native capacity
2910 * @disk: struct gendisk to set capacity for
2911 *
2912 * Block layer calls this function if it detects that partitions
2913 * on @disk reach beyond the end of the device. If the SCSI host
2914 * implements ->unlock_native_capacity() method, it's invoked to
2915 * give it a chance to adjust the device capacity.
2916 *
2917 * CONTEXT:
2918 * Defined by block layer. Might sleep.
2919 */
2920static void sd_unlock_native_capacity(struct gendisk *disk)
2921{
2922 struct scsi_device *sdev = scsi_disk(disk)->device;
2923
2924 if (sdev->host->hostt->unlock_native_capacity)
2925 sdev->host->hostt->unlock_native_capacity(sdev);
2926}
2927
2928/**
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002929 * sd_format_disk_name - format disk name
2930 * @prefix: name prefix - ie. "sd" for SCSI disks
2931 * @index: index of the disk to format name for
2932 * @buf: output buffer
2933 * @buflen: length of the output buffer
2934 *
2935 * SCSI disk names starts at sda. The 26th device is sdz and the
2936 * 27th is sdaa. The last one for two lettered suffix is sdzz
2937 * which is followed by sdaaa.
2938 *
2939 * This is basically 26 base counting with one extra 'nil' entry
Daniel Mack3ad2f3f2010-02-03 08:01:28 +08002940 * at the beginning from the second digit on and can be
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002941 * determined using similar method as 26 base conversion with the
2942 * index shifted -1 after each digit is computed.
2943 *
2944 * CONTEXT:
2945 * Don't care.
2946 *
2947 * RETURNS:
2948 * 0 on success, -errno on failure.
2949 */
2950static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2951{
2952 const int base = 'z' - 'a' + 1;
2953 char *begin = buf + strlen(prefix);
2954 char *end = buf + buflen;
2955 char *p;
2956 int unit;
2957
2958 p = end - 1;
2959 *p = '\0';
2960 unit = base;
2961 do {
2962 if (p == begin)
2963 return -EINVAL;
2964 *--p = 'a' + (index % unit);
2965 index = (index / unit) - 1;
2966 } while (index >= 0);
2967
2968 memmove(begin, p, end - p);
2969 memcpy(buf, prefix, strlen(prefix));
2970
2971 return 0;
2972}
2973
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002974/*
2975 * The asynchronous part of sd_probe
2976 */
2977static void sd_probe_async(void *data, async_cookie_t cookie)
2978{
2979 struct scsi_disk *sdkp = data;
2980 struct scsi_device *sdp;
2981 struct gendisk *gd;
2982 u32 index;
2983 struct device *dev;
2984
2985 sdp = sdkp->device;
2986 gd = sdkp->disk;
2987 index = sdkp->index;
2988 dev = &sdp->sdev_gendev;
2989
Michael Reed1a03ae02010-09-20 11:20:22 -05002990 gd->major = sd_major((index & 0xf0) >> 4);
2991 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2992 gd->minors = SD_MINORS;
2993
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002994 gd->fops = &sd_fops;
2995 gd->private_data = &sdkp->driver;
2996 gd->queue = sdkp->device->request_queue;
2997
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002998 /* defaults, until the device tells us otherwise */
2999 sdp->sector_size = 512;
3000 sdkp->capacity = 0;
3001 sdkp->media_present = 1;
3002 sdkp->write_prot = 0;
James Bottomley39c60a02013-04-24 14:02:53 -07003003 sdkp->cache_override = 0;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04003004 sdkp->WCE = 0;
3005 sdkp->RCD = 0;
3006 sdkp->ATO = 0;
3007 sdkp->first_scan = 1;
Martin K. Petersen18a4d0a2012-02-09 13:48:53 -05003008 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04003009
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003010 sd_revalidate_disk(gd);
3011
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003012 gd->driverfs_dev = &sdp->sdev_gendev;
NeilBrown97fedbb2010-03-16 08:55:32 +01003013 gd->flags = GENHD_FL_EXT_DEVT;
Tejun Heo2bae0092010-12-18 18:42:23 +01003014 if (sdp->removable) {
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003015 gd->flags |= GENHD_FL_REMOVABLE;
Tejun Heo2bae0092010-12-18 18:42:23 +01003016 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3017 }
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003018
Aaron Lu10c580e2013-10-10 13:22:36 +08003019 blk_pm_runtime_init(sdp->request_queue, dev);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003020 add_disk(gd);
Martin K. Petersenfe542392012-09-21 12:44:12 -04003021 if (sdkp->capacity)
3022 sd_dif_config_host(sdkp);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003023
Martin K. Petersen3821d762009-05-23 11:43:38 -04003024 sd_revalidate_disk(gd);
3025
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003026 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3027 sdp->removable ? "removable " : "");
Alan Stern478a8a02010-06-16 14:52:17 -04003028 scsi_autopm_put_device(sdp);
James Bottomleyea038f62009-08-21 09:47:54 -06003029 put_device(&sdkp->dev);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08003030}
3031
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09003032/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07003033 * sd_probe - called during driver initialization and whenever a
3034 * new scsi device is attached to the system. It is called once
3035 * for each scsi device (not just disks) present.
3036 * @dev: pointer to device object
3037 *
3038 * Returns 0 if successful (or not interested in this scsi device
3039 * (e.g. scanner)); 1 when there is an error.
3040 *
3041 * Note: this function is invoked from the scsi mid-level.
3042 * This function sets up the mapping between a given
3043 * <host,channel,id,lun> (found in sdp) and new device name
3044 * (e.g. /dev/sda). More precisely it is the block device major
3045 * and minor number that is chosen here.
3046 *
Petr Uzel2db93ce2012-02-24 16:56:54 +01003047 * Assume sd_probe is not re-entrant (for time being)
3048 * Also think about sd_probe() and sd_remove() running coincidentally.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049 **/
3050static int sd_probe(struct device *dev)
3051{
3052 struct scsi_device *sdp = to_scsi_device(dev);
3053 struct scsi_disk *sdkp;
3054 struct gendisk *gd;
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07003055 int index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003056 int error;
3057
Subhash Jadavani6fe8c1d2014-09-10 14:54:09 +03003058 scsi_autopm_get_device(sdp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01003060 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003061 goto out;
3062
James Bottomley9ccfc752005-10-02 11:45:08 -05003063 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
Petr Uzel2db93ce2012-02-24 16:56:54 +01003064 "sd_probe\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003065
3066 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05003067 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068 if (!sdkp)
3069 goto out;
3070
Tejun Heo689d6fa2008-08-25 19:56:16 +09003071 gd = alloc_disk(SD_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003072 if (!gd)
3073 goto out_free;
3074
Tejun Heof27bac22008-07-14 14:59:30 +09003075 do {
3076 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3077 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003078
Tejun Heo4034cc62009-02-21 11:04:45 +09003079 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09003080 error = ida_get_new(&sd_index_ida, &index);
Tejun Heo4034cc62009-02-21 11:04:45 +09003081 spin_unlock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09003082 } while (error == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003083
Dave Kleikamp21208ae2011-10-19 11:49:04 -05003084 if (error) {
3085 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003086 goto out_put;
Michael Reed1a03ae02010-09-20 11:20:22 -05003087 }
3088
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09003089 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
Dave Kleikamp21208ae2011-10-19 11:49:04 -05003090 if (error) {
3091 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
Tejun Heof27bac22008-07-14 14:59:30 +09003092 goto out_free_index;
Dave Kleikamp21208ae2011-10-19 11:49:04 -05003093 }
Tejun Heof27bac22008-07-14 14:59:30 +09003094
Linus Torvalds1da177e2005-04-16 15:20:36 -07003095 sdkp->device = sdp;
3096 sdkp->driver = &sd_template;
3097 sdkp->disk = gd;
3098 sdkp->index = index;
Arnd Bergmann409f3492010-07-07 16:51:29 +02003099 atomic_set(&sdkp->openers, 0);
Josh Hunt9e1a1532012-06-09 07:03:39 -07003100 atomic_set(&sdkp->device->ioerr_cnt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003101
James Bottomley601e7632009-05-26 20:35:48 +00003102 if (!sdp->request_queue->rq_timeout) {
3103 if (sdp->type != TYPE_MOD)
3104 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3105 else
3106 blk_queue_rq_timeout(sdp->request_queue,
3107 SD_MOD_TIMEOUT);
3108 }
3109
3110 device_initialize(&sdkp->dev);
Alan Stern478a8a02010-06-16 14:52:17 -04003111 sdkp->dev.parent = dev;
James Bottomley601e7632009-05-26 20:35:48 +00003112 sdkp->dev.class = &sd_disk_class;
Kees Cook02aa2a32013-07-03 15:04:56 -07003113 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
James Bottomley601e7632009-05-26 20:35:48 +00003114
Dan Carpenterdee05862015-01-19 17:41:12 +03003115 error = device_add(&sdkp->dev);
3116 if (error)
James Bottomley601e7632009-05-26 20:35:48 +00003117 goto out_free_index;
3118
Alan Stern478a8a02010-06-16 14:52:17 -04003119 get_device(dev);
3120 dev_set_drvdata(dev, sdkp);
James Bottomley601e7632009-05-26 20:35:48 +00003121
James Bottomleyea038f62009-08-21 09:47:54 -06003122 get_device(&sdkp->dev); /* prevent release before async_schedule */
Dan Williamsa7a20d12012-03-22 17:05:11 -07003123 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003124
3125 return 0;
3126
Tejun Heof27bac22008-07-14 14:59:30 +09003127 out_free_index:
Tejun Heo4034cc62009-02-21 11:04:45 +09003128 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09003129 ida_remove(&sd_index_ida, index);
Tejun Heo4034cc62009-02-21 11:04:45 +09003130 spin_unlock(&sd_index_lock);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06003131 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003132 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06003133 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003134 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06003135 out:
Subhash Jadavani6fe8c1d2014-09-10 14:54:09 +03003136 scsi_autopm_put_device(sdp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003137 return error;
3138}
3139
3140/**
3141 * sd_remove - called whenever a scsi disk (previously recognized by
3142 * sd_probe) is detached from the system. It is called (potentially
3143 * multiple times) during sd module unload.
3144 * @sdp: pointer to mid level scsi device object
3145 *
3146 * Note: this function is invoked from the scsi mid-level.
3147 * This function potentially frees up a device name (e.g. /dev/sdc)
3148 * that could be re-used by a subsequent sd_probe().
3149 * This function is not called when the built-in sd driver is "exit-ed".
3150 **/
3151static int sd_remove(struct device *dev)
3152{
James Bottomley601e7632009-05-26 20:35:48 +00003153 struct scsi_disk *sdkp;
Hannes Reinecke0761df92013-05-10 11:06:16 +02003154 dev_t devt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003155
James Bottomley601e7632009-05-26 20:35:48 +00003156 sdkp = dev_get_drvdata(dev);
Hannes Reinecke0761df92013-05-10 11:06:16 +02003157 devt = disk_devt(sdkp->disk);
Alan Stern478a8a02010-06-16 14:52:17 -04003158 scsi_autopm_get_device(sdkp->device);
3159
Dan Williams3c31b522014-04-10 15:30:35 -07003160 async_synchronize_full_domain(&scsi_sd_pm_domain);
Dan Williamsa7a20d12012-03-22 17:05:11 -07003161 async_synchronize_full_domain(&scsi_sd_probe_domain);
Tony Jonesee959b02008-02-22 00:13:36 +01003162 device_del(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003163 del_gendisk(sdkp->disk);
3164 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003165
Hannes Reinecke0761df92013-05-10 11:06:16 +02003166 blk_register_region(devt, SD_MINORS, NULL,
3167 sd_default_probe, NULL, NULL);
3168
Arjan van de Ven0b950672006-01-11 13:16:10 +01003169 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003170 dev_set_drvdata(dev, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01003171 put_device(&sdkp->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01003172 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003173
3174 return 0;
3175}
3176
3177/**
3178 * scsi_disk_release - Called to free the scsi_disk structure
Tony Jonesee959b02008-02-22 00:13:36 +01003179 * @dev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07003180 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01003181 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07003182 * called on last put, you should always use the scsi_disk_get()
3183 * scsi_disk_put() helpers which manipulate the semaphore directly
Tony Jonesee959b02008-02-22 00:13:36 +01003184 * and never do a direct put_device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003185 **/
Tony Jonesee959b02008-02-22 00:13:36 +01003186static void scsi_disk_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003187{
Tony Jonesee959b02008-02-22 00:13:36 +01003188 struct scsi_disk *sdkp = to_scsi_disk(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003189 struct gendisk *disk = sdkp->disk;
3190
Tejun Heo4034cc62009-02-21 11:04:45 +09003191 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09003192 ida_remove(&sd_index_ida, sdkp->index);
Tejun Heo4034cc62009-02-21 11:04:45 +09003193 spin_unlock(&sd_index_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003194
3195 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003196 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003197 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003198
3199 kfree(sdkp);
3200}
3201
James Bottomleycc5d2c82007-03-20 12:26:03 -05003202static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
Tejun Heoc3c94c52007-03-21 00:13:59 +09003203{
3204 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3205 struct scsi_sense_hdr sshdr;
James Bottomleycc5d2c82007-03-20 12:26:03 -05003206 struct scsi_device *sdp = sdkp->device;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003207 int res;
3208
3209 if (start)
3210 cmd[4] |= 1; /* START */
3211
Stefan Richterd2886ea2008-05-11 00:34:07 +02003212 if (sdp->start_stop_pwr_cond)
3213 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3214
Tejun Heoc3c94c52007-03-21 00:13:59 +09003215 if (!scsi_device_online(sdp))
3216 return -ENODEV;
3217
Lin Ming9b214932013-03-23 11:42:25 +08003218 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3219 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003220 if (res) {
Hannes Reineckeef613292014-10-24 14:27:00 +02003221 sd_print_result(sdkp, "Start/Stop Unit failed", res);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003222 if (driver_byte(res) & DRIVER_SENSE)
James Bottomleycc5d2c82007-03-20 12:26:03 -05003223 sd_print_sense_hdr(sdkp, &sshdr);
Oliver Neukum95897912013-09-16 13:28:15 +02003224 if (scsi_sense_valid(&sshdr) &&
3225 /* 0x3a is medium not present */
3226 sshdr.asc == 0x3a)
3227 res = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003228 }
3229
Oliver Neukum95897912013-09-16 13:28:15 +02003230 /* SCSI error codes must not go to the generic layer */
3231 if (res)
3232 return -EIO;
3233
3234 return 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003235}
3236
Linus Torvalds1da177e2005-04-16 15:20:36 -07003237/*
3238 * Send a SYNCHRONIZE CACHE instruction down to the device through
3239 * the normal SCSI command structure. Wait for the command to
3240 * complete.
3241 */
3242static void sd_shutdown(struct device *dev)
3243{
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01003244 struct scsi_disk *sdkp = dev_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003245
3246 if (!sdkp)
3247 return; /* this can happen */
3248
Lin Ming54f575882011-12-05 09:20:26 +08003249 if (pm_runtime_suspended(dev))
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01003250 return;
Lin Ming54f575882011-12-05 09:20:26 +08003251
Oliver Neukum95897912013-09-16 13:28:15 +02003252 if (sdkp->WCE && sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05003253 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3254 sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -05003255 }
Tejun Heoc3c94c52007-03-21 00:13:59 +09003256
James Bottomleycc5d2c82007-03-20 12:26:03 -05003257 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3258 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3259 sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003260 }
Alan Stern39b7f1e2005-11-04 14:44:41 -05003261}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003262
Oliver Neukum95897912013-09-16 13:28:15 +02003263static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
Tejun Heoc3c94c52007-03-21 00:13:59 +09003264{
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01003265 struct scsi_disk *sdkp = dev_get_drvdata(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04003266 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003267
3268 if (!sdkp)
3269 return 0; /* this can happen */
3270
Oliver Neukum95897912013-09-16 13:28:15 +02003271 if (sdkp->WCE && sdkp->media_present) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05003272 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
Tejun Heoc3c94c52007-03-21 00:13:59 +09003273 ret = sd_sync_cache(sdkp);
Oliver Neukum95897912013-09-16 13:28:15 +02003274 if (ret) {
3275 /* ignore OFFLINE device */
3276 if (ret == -ENODEV)
3277 ret = 0;
Alan Stern09ff92f2007-05-21 09:55:04 -04003278 goto done;
Oliver Neukum95897912013-09-16 13:28:15 +02003279 }
Tejun Heoc3c94c52007-03-21 00:13:59 +09003280 }
3281
Aaron Lu691e3d32012-11-09 15:27:55 +08003282 if (sdkp->device->manage_start_stop) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05003283 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
Oliver Neukum95897912013-09-16 13:28:15 +02003284 /* an error is not worth aborting a system sleep */
James Bottomleycc5d2c82007-03-20 12:26:03 -05003285 ret = sd_start_stop_device(sdkp, 0);
Oliver Neukum95897912013-09-16 13:28:15 +02003286 if (ignore_stop_errors)
3287 ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003288 }
3289
Alan Stern09ff92f2007-05-21 09:55:04 -04003290done:
Alan Stern09ff92f2007-05-21 09:55:04 -04003291 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003292}
3293
Oliver Neukum95897912013-09-16 13:28:15 +02003294static int sd_suspend_system(struct device *dev)
3295{
3296 return sd_suspend_common(dev, true);
3297}
3298
3299static int sd_suspend_runtime(struct device *dev)
3300{
3301 return sd_suspend_common(dev, false);
3302}
3303
Tejun Heoc3c94c52007-03-21 00:13:59 +09003304static int sd_resume(struct device *dev)
3305{
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01003306 struct scsi_disk *sdkp = dev_get_drvdata(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003307
James Bottomleycc5d2c82007-03-20 12:26:03 -05003308 if (!sdkp->device->manage_start_stop)
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01003309 return 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09003310
James Bottomleycc5d2c82007-03-20 12:26:03 -05003311 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
Christoph Hellwig3d9a1f52015-02-02 14:01:25 +01003312 return sd_start_stop_device(sdkp, 1);
Tejun Heoc3c94c52007-03-21 00:13:59 +09003313}
3314
Linus Torvalds1da177e2005-04-16 15:20:36 -07003315/**
3316 * init_sd - entry point for this driver (both when built in or when
3317 * a module).
3318 *
3319 * Note: this function registers this driver with the scsi mid-level.
3320 **/
3321static int __init init_sd(void)
3322{
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003323 int majors = 0, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003324
3325 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3326
Hannes Reinecke0761df92013-05-10 11:06:16 +02003327 for (i = 0; i < SD_MAJORS; i++) {
3328 if (register_blkdev(sd_major(i), "sd") != 0)
3329 continue;
3330 majors++;
3331 blk_register_region(sd_major(i), SD_MINORS, NULL,
3332 sd_default_probe, NULL, NULL);
3333 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003334
3335 if (!majors)
3336 return -ENODEV;
3337
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003338 err = class_register(&sd_disk_class);
3339 if (err)
3340 goto err_out;
James Bottomley6bdaa1f2006-03-18 14:14:21 -06003341
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003342 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3343 0, 0, NULL);
3344 if (!sd_cdb_cache) {
3345 printk(KERN_ERR "sd: can't init extended cdb cache\n");
Clément Calmels8d964472014-06-03 23:34:25 +02003346 err = -ENOMEM;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003347 goto err_out_class;
3348 }
3349
3350 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3351 if (!sd_cdb_pool) {
3352 printk(KERN_ERR "sd: can't init extended cdb pool\n");
Clément Calmels8d964472014-06-03 23:34:25 +02003353 err = -ENOMEM;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003354 goto err_out_cache;
3355 }
3356
Joel D. Diazafd5e342012-10-10 10:36:11 +02003357 err = scsi_register_driver(&sd_template.gendrv);
3358 if (err)
3359 goto err_out_driver;
3360
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003361 return 0;
3362
Joel D. Diazafd5e342012-10-10 10:36:11 +02003363err_out_driver:
3364 mempool_destroy(sd_cdb_pool);
3365
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003366err_out_cache:
3367 kmem_cache_destroy(sd_cdb_cache);
3368
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003369err_out_class:
3370 class_unregister(&sd_disk_class);
3371err_out:
3372 for (i = 0; i < SD_MAJORS; i++)
3373 unregister_blkdev(sd_major(i), "sd");
3374 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003375}
3376
3377/**
3378 * exit_sd - exit point for this driver (when it is a module).
3379 *
3380 * Note: this function unregisters this driver from the scsi mid-level.
3381 **/
3382static void __exit exit_sd(void)
3383{
3384 int i;
3385
3386 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3387
Joel D. Diazafd5e342012-10-10 10:36:11 +02003388 scsi_unregister_driver(&sd_template.gendrv);
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04003389 mempool_destroy(sd_cdb_pool);
3390 kmem_cache_destroy(sd_cdb_cache);
3391
Jeff Garzik5e4009b2006-10-04 05:32:54 -04003392 class_unregister(&sd_disk_class);
3393
Hannes Reinecke0761df92013-05-10 11:06:16 +02003394 for (i = 0; i < SD_MAJORS; i++) {
3395 blk_unregister_region(sd_major(i), SD_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003396 unregister_blkdev(sd_major(i), "sd");
Hannes Reinecke0761df92013-05-10 11:06:16 +02003397 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003398}
3399
Linus Torvalds1da177e2005-04-16 15:20:36 -07003400module_init(init_sd);
3401module_exit(exit_sd);
Martin K. Petersene73aec82007-02-27 22:40:55 -05003402
3403static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3404 struct scsi_sense_hdr *sshdr)
3405{
Hannes Reinecke21045512015-01-08 07:43:46 +01003406 scsi_print_sense_hdr(sdkp->device,
3407 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
Martin K. Petersene73aec82007-02-27 22:40:55 -05003408}
3409
Hannes Reineckeef613292014-10-24 14:27:00 +02003410static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3411 int result)
Martin K. Petersene73aec82007-02-27 22:40:55 -05003412{
Hannes Reineckeef613292014-10-24 14:27:00 +02003413 const char *hb_string = scsi_hostbyte_string(result);
3414 const char *db_string = scsi_driverbyte_string(result);
3415
3416 if (hb_string || db_string)
3417 sd_printk(KERN_INFO, sdkp,
3418 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3419 hb_string ? hb_string : "invalid",
3420 db_string ? db_string : "invalid");
3421 else
3422 sd_printk(KERN_INFO, sdkp,
3423 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3424 msg, host_byte(result), driver_byte(result));
Martin K. Petersene73aec82007-02-27 22:40:55 -05003425}
3426