blob: 57d1e3e1bd4478548f89ef9f3a472ee4418c71b3 [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>
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +020049#include <linux/smp_lock.h>
Arjan van de Ven0b950672006-01-11 13:16:10 +010050#include <linux/mutex.h>
James Bottomley7404ad3b2008-08-31 10:41:52 -050051#include <linux/string_helpers.h>
Arjan van de Ven4ace92f2009-01-04 05:32:28 -080052#include <linux/async.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090053#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <asm/uaccess.h>
Dave Hansen8f76d152009-04-21 16:43:27 -070055#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#include <scsi/scsi.h>
58#include <scsi/scsi_cmnd.h>
59#include <scsi/scsi_dbg.h>
60#include <scsi/scsi_device.h>
61#include <scsi/scsi_driver.h>
62#include <scsi/scsi_eh.h>
63#include <scsi/scsi_host.h>
64#include <scsi/scsi_ioctl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <scsi/scsicam.h>
66
Martin K. Petersenaa916962008-06-17 12:47:32 -040067#include "sd.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include "scsi_logging.h"
69
Rene Hermanf018fa52006-03-08 00:14:20 -080070MODULE_AUTHOR("Eric Youngdale");
71MODULE_DESCRIPTION("SCSI disk (sd) driver");
72MODULE_LICENSE("GPL");
73
74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
Michael Tokarevd7b8bcb2006-10-27 16:02:37 +040090MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
91MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
92MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
Rene Hermanf018fa52006-03-08 00:14:20 -080093
Tejun Heo870d6652008-08-25 19:47:25 +090094#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
Tejun Heof615b482008-08-25 19:47:24 +090095#define SD_MINORS 16
Tejun Heo870d6652008-08-25 19:47:25 +090096#else
Tejun Heo3e1a7ff2008-08-25 19:56:17 +090097#define SD_MINORS 0
Tejun Heo870d6652008-08-25 19:47:25 +090098#endif
99
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800100static int sd_revalidate_disk(struct gendisk *);
Tejun Heo72ec24b2010-05-15 20:09:32 +0200101static void sd_unlock_native_capacity(struct gendisk *disk);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800102static int sd_probe(struct device *);
103static int sd_remove(struct device *);
104static void sd_shutdown(struct device *);
105static int sd_suspend(struct device *, pm_message_t state);
106static int sd_resume(struct device *);
107static void sd_rescan(struct device *);
108static int sd_done(struct scsi_cmnd *);
109static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
Tony Jonesee959b02008-02-22 00:13:36 +0100110static void scsi_disk_release(struct device *cdev);
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800111static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
112static void sd_print_result(struct scsi_disk *, int);
113
Tejun Heo4034cc62009-02-21 11:04:45 +0900114static DEFINE_SPINLOCK(sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +0900115static DEFINE_IDA(sd_index_ida);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117/* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
Arjan van de Ven0b950672006-01-11 13:16:10 +0100120static DEFINE_MUTEX(sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700122static struct kmem_cache *sd_cdb_cache;
123static mempool_t *sd_cdb_pool;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400124
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600125static const char *sd_cache_types[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
128};
129
Tony Jonesee959b02008-02-22 00:13:36 +0100130static ssize_t
131sd_store_cache_type(struct device *dev, struct device_attribute *attr,
132 const char *buf, size_t count)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600133{
134 int i, ct = -1, rcd, wce, sp;
Tony Jonesee959b02008-02-22 00:13:36 +0100135 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600136 struct scsi_device *sdp = sdkp->device;
137 char buffer[64];
138 char *buffer_data;
139 struct scsi_mode_data data;
140 struct scsi_sense_hdr sshdr;
141 int len;
142
143 if (sdp->type != TYPE_DISK)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
147 return -EINVAL;
148
Tobias Klauser6391a112006-06-08 22:23:48 -0700149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
H Hartley Sweeten439d77f2010-08-10 18:01:20 -0700150 len = strlen(sd_cache_types[i]);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600151 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
152 buf[len] == '\n') {
153 ct = i;
154 break;
155 }
156 }
157 if (ct < 0)
158 return -EINVAL;
159 rcd = ct & 0x01 ? 1 : 0;
160 wce = ct & 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
162 SD_MAX_RETRIES, &data, NULL))
163 return -EINVAL;
Andrew Mortona9312fb2006-03-25 03:08:30 -0800164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600165 data.block_descriptor_length);
166 buffer_data = buffer + data.header_length +
167 data.block_descriptor_length;
168 buffer_data[2] &= ~0x05;
169 buffer_data[2] |= wce << 2 | rcd;
170 sp = buffer_data[0] & 0x80 ? 1 : 0;
171
172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
173 SD_MAX_RETRIES, &data, &sshdr)) {
174 if (scsi_sense_valid(&sshdr))
Martin K. Petersene73aec82007-02-27 22:40:55 -0500175 sd_print_sense_hdr(sdkp, &sshdr);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600176 return -EINVAL;
177 }
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -0600178 revalidate_disk(sdkp->disk);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600179 return count;
180}
181
Tony Jonesee959b02008-02-22 00:13:36 +0100182static ssize_t
183sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
184 const char *buf, size_t count)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900185{
Tony Jonesee959b02008-02-22 00:13:36 +0100186 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900187 struct scsi_device *sdp = sdkp->device;
188
189 if (!capable(CAP_SYS_ADMIN))
190 return -EACCES;
191
192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
193
194 return count;
195}
196
Tony Jonesee959b02008-02-22 00:13:36 +0100197static ssize_t
198sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
199 const char *buf, size_t count)
Brian Kinga144c5a2006-06-27 11:10:31 -0500200{
Tony Jonesee959b02008-02-22 00:13:36 +0100201 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500202 struct scsi_device *sdp = sdkp->device;
203
204 if (!capable(CAP_SYS_ADMIN))
205 return -EACCES;
206
207 if (sdp->type != TYPE_DISK)
208 return -EINVAL;
209
210 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
211
212 return count;
213}
214
Tony Jonesee959b02008-02-22 00:13:36 +0100215static ssize_t
216sd_show_cache_type(struct device *dev, struct device_attribute *attr,
217 char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600218{
Tony Jonesee959b02008-02-22 00:13:36 +0100219 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600220 int ct = sdkp->RCD + 2*sdkp->WCE;
221
222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
223}
224
Tony Jonesee959b02008-02-22 00:13:36 +0100225static ssize_t
226sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600227{
Tony Jonesee959b02008-02-22 00:13:36 +0100228 struct scsi_disk *sdkp = to_scsi_disk(dev);
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600229
230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
231}
232
Tony Jonesee959b02008-02-22 00:13:36 +0100233static ssize_t
234sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
235 char *buf)
Tejun Heoc3c94c52007-03-21 00:13:59 +0900236{
Tony Jonesee959b02008-02-22 00:13:36 +0100237 struct scsi_disk *sdkp = to_scsi_disk(dev);
Tejun Heoc3c94c52007-03-21 00:13:59 +0900238 struct scsi_device *sdp = sdkp->device;
239
240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
241}
242
Tony Jonesee959b02008-02-22 00:13:36 +0100243static ssize_t
244sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
245 char *buf)
Brian Kinga144c5a2006-06-27 11:10:31 -0500246{
Tony Jonesee959b02008-02-22 00:13:36 +0100247 struct scsi_disk *sdkp = to_scsi_disk(dev);
Brian Kinga144c5a2006-06-27 11:10:31 -0500248
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250}
251
Martin K. Petersene0597d72008-07-17 04:28:34 -0400252static ssize_t
253sd_show_protection_type(struct device *dev, struct device_attribute *attr,
254 char *buf)
255{
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257
258 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
259}
260
261static ssize_t
262sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
263 char *buf)
264{
265 struct scsi_disk *sdkp = to_scsi_disk(dev);
266
267 return snprintf(buf, 20, "%u\n", sdkp->ATO);
268}
269
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500270static ssize_t
271sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
272 char *buf)
273{
274 struct scsi_disk *sdkp = to_scsi_disk(dev);
275
276 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
277}
278
Tony Jonesee959b02008-02-22 00:13:36 +0100279static struct device_attribute sd_disk_attrs[] = {
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600280 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
281 sd_store_cache_type),
282 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
Brian Kinga144c5a2006-06-27 11:10:31 -0500283 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
284 sd_store_allow_restart),
Tejun Heoc3c94c52007-03-21 00:13:59 +0900285 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
286 sd_store_manage_start_stop),
Martin K. Petersene0597d72008-07-17 04:28:34 -0400287 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
288 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500289 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600290 __ATTR_NULL,
291};
292
293static struct class sd_disk_class = {
294 .name = "scsi_disk",
295 .owner = THIS_MODULE,
Tony Jonesee959b02008-02-22 00:13:36 +0100296 .dev_release = scsi_disk_release,
297 .dev_attrs = sd_disk_attrs,
James Bottomley6bdaa1f2006-03-18 14:14:21 -0600298};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300static struct scsi_driver sd_template = {
301 .owner = THIS_MODULE,
302 .gendrv = {
303 .name = "sd",
304 .probe = sd_probe,
305 .remove = sd_remove,
Tejun Heoc3c94c52007-03-21 00:13:59 +0900306 .suspend = sd_suspend,
307 .resume = sd_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 .shutdown = sd_shutdown,
309 },
310 .rescan = sd_rescan,
Linus Torvalds7b3d9542008-01-06 10:17:12 -0800311 .done = sd_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312};
313
314/*
315 * Device no to disk mapping:
316 *
317 * major disc2 disc p1
318 * |............|.............|....|....| <- dev_t
319 * 31 20 19 8 7 4 3 0
320 *
321 * Inside a major, we have 16k disks, however mapped non-
322 * contiguously. The first 16 disks are for major0, the next
323 * ones with major1, ... Disk 256 is for major0 again, disk 272
324 * for major1, ...
325 * As we stay compatible with our numbering scheme, we can reuse
326 * the well-know SCSI majors 8, 65--71, 136--143.
327 */
328static int sd_major(int major_idx)
329{
330 switch (major_idx) {
331 case 0:
332 return SCSI_DISK0_MAJOR;
333 case 1 ... 7:
334 return SCSI_DISK1_MAJOR + major_idx - 1;
335 case 8 ... 15:
336 return SCSI_DISK8_MAJOR + major_idx - 8;
337 default:
338 BUG();
339 return 0; /* shut up gcc */
340 }
341}
342
Alan Stern39b7f1e2005-11-04 14:44:41 -0500343static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345 struct scsi_disk *sdkp = NULL;
346
Alan Stern39b7f1e2005-11-04 14:44:41 -0500347 if (disk->private_data) {
348 sdkp = scsi_disk(disk);
349 if (scsi_device_get(sdkp->device) == 0)
Tony Jonesee959b02008-02-22 00:13:36 +0100350 get_device(&sdkp->dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500351 else
352 sdkp = NULL;
353 }
354 return sdkp;
355}
356
357static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
358{
359 struct scsi_disk *sdkp;
360
Arjan van de Ven0b950672006-01-11 13:16:10 +0100361 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500362 sdkp = __scsi_disk_get(disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100363 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 return sdkp;
Alan Stern39b7f1e2005-11-04 14:44:41 -0500365}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Alan Stern39b7f1e2005-11-04 14:44:41 -0500367static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
368{
369 struct scsi_disk *sdkp;
370
Arjan van de Ven0b950672006-01-11 13:16:10 +0100371 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -0500372 sdkp = dev_get_drvdata(dev);
373 if (sdkp)
374 sdkp = __scsi_disk_get(sdkp->disk);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100375 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 return sdkp;
377}
378
379static void scsi_disk_put(struct scsi_disk *sdkp)
380{
381 struct scsi_device *sdev = sdkp->device;
382
Arjan van de Ven0b950672006-01-11 13:16:10 +0100383 mutex_lock(&sd_ref_mutex);
Tony Jonesee959b02008-02-22 00:13:36 +0100384 put_device(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 scsi_device_put(sdev);
Arjan van de Ven0b950672006-01-11 13:16:10 +0100386 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387}
388
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400389static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
390{
391 unsigned int prot_op = SCSI_PROT_NORMAL;
392 unsigned int dix = scsi_prot_sg_count(scmd);
393
394 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
395 if (dif && dix)
396 prot_op = SCSI_PROT_READ_PASS;
397 else if (dif && !dix)
398 prot_op = SCSI_PROT_READ_STRIP;
399 else if (!dif && dix)
400 prot_op = SCSI_PROT_READ_INSERT;
401 } else {
402 if (dif && dix)
403 prot_op = SCSI_PROT_WRITE_PASS;
404 else if (dif && !dix)
405 prot_op = SCSI_PROT_WRITE_INSERT;
406 else if (!dif && dix)
407 prot_op = SCSI_PROT_WRITE_STRIP;
408 }
409
410 scsi_set_prot_op(scmd, prot_op);
411 scsi_set_prot_type(scmd, dif);
412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414/**
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200415 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
416 * @sdp: scsi device to operate one
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500417 * @rq: Request to prepare
418 *
419 * Will issue either UNMAP or WRITE SAME(16) depending on preference
420 * indicated by target device.
421 **/
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200422static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500423{
424 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
425 struct bio *bio = rq->bio;
426 sector_t sector = bio->bi_sector;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200427 unsigned int nr_sectors = bio_sectors(bio);
428 unsigned int len;
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900429 int ret;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200430 struct page *page;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500431
432 if (sdkp->device->sector_size == 4096) {
433 sector >>= 3;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200434 nr_sectors >>= 3;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500435 }
436
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500437 rq->timeout = SD_TIMEOUT;
438
439 memset(rq->cmd, 0, rq->cmd_len);
440
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200441 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
442 if (!page)
443 return BLKPREP_DEFER;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500444
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200445 if (sdkp->unmap) {
446 char *buf = page_address(page);
447
448 rq->cmd_len = 10;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500449 rq->cmd[0] = UNMAP;
450 rq->cmd[8] = 24;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500451
452 put_unaligned_be16(6 + 16, &buf[0]);
453 put_unaligned_be16(16, &buf[2]);
454 put_unaligned_be64(sector, &buf[8]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200455 put_unaligned_be32(nr_sectors, &buf[16]);
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500456
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200457 len = 24;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500458 } else {
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200459 rq->cmd_len = 16;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500460 rq->cmd[0] = WRITE_SAME_16;
461 rq->cmd[1] = 0x8; /* UNMAP */
462 put_unaligned_be64(sector, &rq->cmd[2]);
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200463 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
464
465 len = sdkp->device->sector_size;
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500466 }
467
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200468 blk_add_request_payload(rq, page, len);
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900469 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
470 rq->buffer = page_address(page);
FUJITA Tomonori610a6342010-07-08 10:16:17 +0200471 if (ret != BLKPREP_OK) {
472 __free_page(page);
473 rq->buffer = NULL;
474 }
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900475 return ret;
476}
477
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900478static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
479{
Mike Christiee3b3e622010-08-11 11:06:25 -0500480 rq->timeout = SD_FLUSH_TIMEOUT;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900481 rq->retries = SD_MAX_RETRIES;
482 rq->cmd[0] = SYNCHRONIZE_CACHE;
483 rq->cmd_len = 10;
484
485 return scsi_setup_blk_pc_cmnd(sdp, rq);
486}
487
FUJITA Tomonorif1126e92010-07-01 19:49:18 +0900488static void sd_unprep_fn(struct request_queue *q, struct request *rq)
489{
FUJITA Tomonori610a6342010-07-08 10:16:17 +0200490 if (rq->cmd_flags & REQ_DISCARD) {
491 free_page((unsigned long)rq->buffer);
492 rq->buffer = NULL;
493 }
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500494}
495
496/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 * sd_init_command - build a scsi (read or write) command from
498 * information in the request structure.
499 * @SCpnt: pointer to mid-level's per scsi command structure that
500 * contains request and into which the scsi command is written
501 *
502 * Returns 1 if successful and 0 if error (or cannot be done now).
503 **/
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500504static int sd_prep_fn(struct request_queue *q, struct request *rq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500506 struct scsi_cmnd *SCpnt;
507 struct scsi_device *sdp = q->queuedata;
Christoph Hellwig776b23a2006-01-06 18:34:07 +0100508 struct gendisk *disk = rq->rq_disk;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400509 struct scsi_disk *sdkp;
Tejun Heo83096eb2009-05-07 22:24:39 +0900510 sector_t block = blk_rq_pos(rq);
Linus Torvalds18351072008-08-05 21:42:21 -0700511 sector_t threshold;
Tejun Heo83096eb2009-05-07 22:24:39 +0900512 unsigned int this_count = blk_rq_sectors(rq);
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400513 int ret, host_dif;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400514 unsigned char protect;
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500515
Martin K. Petersene339c1a2009-11-26 12:00:40 -0500516 /*
517 * Discard request come in as REQ_TYPE_FS but we turn them into
518 * block PC requests to make life easier.
519 */
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200520 if (rq->cmd_flags & REQ_DISCARD) {
521 ret = scsi_setup_discard_cmnd(sdp, rq);
522 goto out;
FUJITA Tomonori90467c22010-07-03 17:45:34 +0900523 } else if (rq->cmd_flags & REQ_FLUSH) {
524 ret = scsi_setup_flush_cmnd(sdp, rq);
525 goto out;
Christoph Hellwig66ac0282010-06-18 16:59:42 +0200526 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500527 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
528 goto out;
529 } else if (rq->cmd_type != REQ_TYPE_FS) {
530 ret = BLKPREP_KILL;
531 goto out;
532 }
533 ret = scsi_setup_fs_cmnd(sdp, rq);
534 if (ret != BLKPREP_OK)
535 goto out;
536 SCpnt = rq->special;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400537 sdkp = scsi_disk(disk);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500538
539 /* from here on until we're complete, any goto out
540 * is used for a killable error condition */
541 ret = BLKPREP_KILL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500543 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
544 "sd_init_command: block=%llu, "
545 "count=%d\n",
546 (unsigned long long)block,
547 this_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
549 if (!sdp || !scsi_device_online(sdp) ||
Tejun Heo83096eb2009-05-07 22:24:39 +0900550 block + blk_rq_sectors(rq) > get_capacity(disk)) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500551 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900552 "Finishing %u sectors\n",
553 blk_rq_sectors(rq)));
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500554 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
555 "Retry with 0x%p\n", SCpnt));
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500556 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 }
558
559 if (sdp->changed) {
560 /*
561 * quietly refuse to do anything to a changed disc until
562 * the changed bit has been reset
563 */
564 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500565 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 }
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500567
Hans de Goedea0899d42008-01-20 11:12:26 +0100568 /*
Linus Torvalds18351072008-08-05 21:42:21 -0700569 * Some SD card readers can't handle multi-sector accesses which touch
570 * the last one or two hardware sectors. Split accesses as needed.
Hans de Goedea0899d42008-01-20 11:12:26 +0100571 */
Linus Torvalds18351072008-08-05 21:42:21 -0700572 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
573 (sdp->sector_size / 512);
574
575 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
576 if (block < threshold) {
577 /* Access up to the threshold but not beyond */
578 this_count = threshold - block;
579 } else {
580 /* Access only a single hardware sector */
581 this_count = sdp->sector_size / 512;
582 }
583 }
Hans de Goedea0899d42008-01-20 11:12:26 +0100584
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500585 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
586 (unsigned long long)block));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 /*
589 * If we have a 1K hardware sectorsize, prevent access to single
590 * 512 byte sectors. In theory we could handle this - in fact
591 * the scsi cdrom driver must be able to handle this because
592 * we typically use 1K blocksizes, and cdroms typically have
593 * 2K hardware sectorsizes. Of course, things are simpler
594 * with the cdrom, since it is read-only. For performance
595 * reasons, the filesystems should be able to handle this
596 * and not force the scsi disk driver to use bounce buffers
597 * for this.
598 */
599 if (sdp->sector_size == 1024) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900600 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500601 scmd_printk(KERN_ERR, SCpnt,
602 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500603 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 } else {
605 block = block >> 1;
606 this_count = this_count >> 1;
607 }
608 }
609 if (sdp->sector_size == 2048) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900610 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500611 scmd_printk(KERN_ERR, SCpnt,
612 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500613 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 } else {
615 block = block >> 2;
616 this_count = this_count >> 2;
617 }
618 }
619 if (sdp->sector_size == 4096) {
Tejun Heo83096eb2009-05-07 22:24:39 +0900620 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500621 scmd_printk(KERN_ERR, SCpnt,
622 "Bad block number requested\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500623 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 } else {
625 block = block >> 3;
626 this_count = this_count >> 3;
627 }
628 }
629 if (rq_data_dir(rq) == WRITE) {
630 if (!sdp->writeable) {
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500631 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 }
633 SCpnt->cmnd[0] = WRITE_6;
634 SCpnt->sc_data_direction = DMA_TO_DEVICE;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400635
636 if (blk_integrity_rq(rq) &&
637 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
638 goto out;
639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 } else if (rq_data_dir(rq) == READ) {
641 SCpnt->cmnd[0] = READ_6;
642 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
643 } else {
Martin K. Petersene73aec82007-02-27 22:40:55 -0500644 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500645 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 }
647
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500648 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
Tejun Heo83096eb2009-05-07 22:24:39 +0900649 "%s %d/%u 512 byte blocks.\n",
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500650 (rq_data_dir(rq) == WRITE) ?
651 "writing" : "reading", this_count,
Tejun Heo83096eb2009-05-07 22:24:39 +0900652 blk_rq_sectors(rq)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400654 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400655 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
656 if (host_dif)
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400657 protect = 1 << 5;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400658 else
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400659 protect = 0;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400660
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400661 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
662 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
663
664 if (unlikely(SCpnt->cmnd == NULL)) {
665 ret = BLKPREP_DEFER;
666 goto out;
667 }
668
669 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
670 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
671 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
672 SCpnt->cmnd[7] = 0x18;
673 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200674 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Martin K. Petersen4e7392e2009-09-20 16:49:38 -0400675
676 /* LBA */
677 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
678 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
679 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
680 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
681 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
682 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
683 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
684 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
685
686 /* Expected Indirect LBA */
687 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
688 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
689 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
690 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
691
692 /* Transfer length */
693 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
694 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
695 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
696 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
697 } else if (block > 0xffffffff) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 SCpnt->cmnd[0] += READ_16 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200699 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
701 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
702 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
703 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
704 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
705 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
706 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
707 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
708 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
709 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
710 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
711 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
712 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
713 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400714 scsi_device_protection(SCpnt->device) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 SCpnt->device->use_10_for_rw) {
716 if (this_count > 0xffff)
717 this_count = 0xffff;
718
719 SCpnt->cmnd[0] += READ_10 - READ_6;
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200720 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
722 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
723 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
724 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
725 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
726 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
727 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
728 } else {
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200729 if (unlikely(rq->cmd_flags & REQ_FUA)) {
Tejun Heo007365a2006-01-06 09:53:52 +0100730 /*
731 * This happens only if this drive failed
732 * 10byte rw command with ILLEGAL_REQUEST
733 * during operation and thus turned off
734 * use_10_for_rw.
735 */
Martin K. Petersene73aec82007-02-27 22:40:55 -0500736 scmd_printk(KERN_ERR, SCpnt,
737 "FUA write on READ/WRITE(6) drive\n");
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500738 goto out;
Tejun Heo007365a2006-01-06 09:53:52 +0100739 }
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
742 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
743 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
744 SCpnt->cmnd[4] = (unsigned char) this_count;
745 SCpnt->cmnd[5] = 0;
746 }
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200747 SCpnt->sdb.length = this_count * sdp->sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400749 /* If DIF or DIX is enabled, tell HBA how to handle request */
Martin K. Petersenbd623e72008-09-19 18:47:19 -0400750 if (host_dif || scsi_prot_sg_count(SCpnt))
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -0400751 sd_prot_op(SCpnt, host_dif);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -0400752
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 /*
754 * We shouldn't disconnect in the middle of a sector, so with a dumb
755 * host adapter, it's safe to assume that we can at least transfer
756 * this many bytes between each connect / disconnect.
757 */
758 SCpnt->transfersize = sdp->sector_size;
759 SCpnt->underflow = this_count << 9;
760 SCpnt->allowed = SD_MAX_RETRIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
762 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 * This indicates that the command is ready from our end to be
764 * queued.
765 */
James Bottomley7f9a6bc2007-08-04 10:06:25 -0500766 ret = BLKPREP_OK;
767 out:
768 return scsi_prep_return(q, rq, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
771/**
772 * sd_open - open a scsi disk device
773 * @inode: only i_rdev member may be used
774 * @filp: only f_mode and f_flags may be used
775 *
776 * Returns 0 if successful. Returns a negated errno value in case
777 * of error.
778 *
779 * Note: This can be called from a user context (e.g. fsck(1) )
780 * or from within the kernel (e.g. as a result of a mount(1) ).
781 * In the latter case @inode and @filp carry an abridged amount
782 * of information as noted above.
Arnd Bergmann409f3492010-07-07 16:51:29 +0200783 *
784 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 **/
Al Viro0338e292008-03-02 10:41:04 -0500786static int sd_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787{
Al Viro0338e292008-03-02 10:41:04 -0500788 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 struct scsi_device *sdev;
790 int retval;
791
Al Viro0338e292008-03-02 10:41:04 -0500792 if (!sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 return -ENXIO;
794
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500795 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
797 sdev = sdkp->device;
798
Alan Stern478a8a02010-06-16 14:52:17 -0400799 retval = scsi_autopm_get_device(sdev);
800 if (retval)
801 goto error_autopm;
802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 /*
804 * If the device is in error recovery, wait until it is done.
805 * If the device is offline, then disallow any access to it.
806 */
807 retval = -ENXIO;
808 if (!scsi_block_when_processing_errors(sdev))
809 goto error_out;
810
811 if (sdev->removable || sdkp->write_prot)
Al Viro0338e292008-03-02 10:41:04 -0500812 check_disk_change(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 /*
815 * If the drive is empty, just let the open fail.
816 */
817 retval = -ENOMEDIUM;
Al Viro0338e292008-03-02 10:41:04 -0500818 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 goto error_out;
820
821 /*
822 * If the device has the write protect tab set, have the open fail
823 * if the user expects to be able to write to the thing.
824 */
825 retval = -EROFS;
Al Viro0338e292008-03-02 10:41:04 -0500826 if (sdkp->write_prot && (mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 goto error_out;
828
829 /*
830 * It is possible that the disk changing stuff resulted in
831 * the device being taken offline. If this is the case,
832 * report this to the user, and don't pretend that the
833 * open actually succeeded.
834 */
835 retval = -ENXIO;
836 if (!scsi_device_online(sdev))
837 goto error_out;
838
Arnd Bergmann409f3492010-07-07 16:51:29 +0200839 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 if (scsi_block_when_processing_errors(sdev))
841 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
842 }
843
844 return 0;
845
846error_out:
Alan Stern478a8a02010-06-16 14:52:17 -0400847 scsi_autopm_put_device(sdev);
848error_autopm:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 scsi_disk_put(sdkp);
850 return retval;
851}
852
853/**
854 * sd_release - invoked when the (last) close(2) is called on this
855 * scsi disk.
856 * @inode: only i_rdev member may be used
857 * @filp: only f_mode and f_flags may be used
858 *
859 * Returns 0.
860 *
861 * Note: may block (uninterruptible) if error recovery is underway
862 * on this disk.
Arnd Bergmann409f3492010-07-07 16:51:29 +0200863 *
864 * Locking: called with bdev->bd_mutex held.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 **/
Al Viro0338e292008-03-02 10:41:04 -0500866static int sd_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 struct scsi_disk *sdkp = scsi_disk(disk);
869 struct scsi_device *sdev = sdkp->device;
870
James Bottomley56937f72007-03-11 12:25:33 -0500871 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Alan Stern7e443312010-09-07 11:27:52 -0400873 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 if (scsi_block_when_processing_errors(sdev))
875 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
876 }
877
878 /*
879 * XXX and what if there are packets in flight and this close()
880 * XXX is followed by a "rmmod sd_mod"?
881 */
Alan Stern478a8a02010-06-16 14:52:17 -0400882
883 scsi_autopm_put_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 scsi_disk_put(sdkp);
885 return 0;
886}
887
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800888static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889{
890 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
891 struct scsi_device *sdp = sdkp->device;
892 struct Scsi_Host *host = sdp->host;
893 int diskinfo[4];
894
895 /* default to most commonly used values */
896 diskinfo[0] = 0x40; /* 1 << 6 */
897 diskinfo[1] = 0x20; /* 1 << 5 */
898 diskinfo[2] = sdkp->capacity >> 11;
899
900 /* override with calculated, extended default, or driver values */
901 if (host->hostt->bios_param)
902 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
903 else
904 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
905
Christoph Hellwiga885c8c2006-01-08 01:02:50 -0800906 geo->heads = diskinfo[0];
907 geo->sectors = diskinfo[1];
908 geo->cylinders = diskinfo[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 return 0;
910}
911
912/**
913 * sd_ioctl - process an ioctl
914 * @inode: only i_rdev/i_bdev members may be used
915 * @filp: only f_mode and f_flags may be used
916 * @cmd: ioctl command number
917 * @arg: this is third argument given to ioctl(2) system call.
918 * Often contains a pointer.
919 *
920 * Returns 0 if successful (some ioctls return postive numbers on
921 * success as well). Returns a negated errno value in case of error.
922 *
923 * Note: most ioctls are forward onto the block subsystem or further
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200924 * down in the scsi subsystem.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 **/
Al Viro0338e292008-03-02 10:41:04 -0500926static int sd_ioctl(struct block_device *bdev, fmode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 unsigned int cmd, unsigned long arg)
928{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 struct gendisk *disk = bdev->bd_disk;
930 struct scsi_device *sdp = scsi_disk(disk)->device;
931 void __user *p = (void __user *)arg;
932 int error;
933
934 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
935 disk->disk_name, cmd));
936
937 /*
938 * If we are in the middle of error recovery, don't let anyone
939 * else try and use this device. Also, if error recovery fails, it
940 * may try and take the device offline, in which case all further
941 * access to the device is prohibited.
942 */
Al Viro83ff6fe2008-03-02 08:15:49 -0500943 error = scsi_nonblockable_ioctl(sdp, cmd, p,
Christoph Hellwigfd4ce1a2008-11-05 14:58:42 +0100944 (mode & FMODE_NDELAY) != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 if (!scsi_block_when_processing_errors(sdp) || !error)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200946 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 /*
949 * Send SCSI addressing ioctls directly to mid level, send other
950 * ioctls to block level and then onto mid level if they can't be
951 * resolved.
952 */
953 switch (cmd) {
954 case SCSI_IOCTL_GET_IDLUN:
955 case SCSI_IOCTL_GET_BUS_NUMBER:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200956 error = scsi_ioctl(sdp, cmd, p);
957 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 default:
Al Viro0338e292008-03-02 10:41:04 -0500959 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 if (error != -ENOTTY)
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200961 break;
962 error = scsi_ioctl(sdp, cmd, p);
963 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 }
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200965out:
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +0200966 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967}
968
969static void set_media_not_present(struct scsi_disk *sdkp)
970{
971 sdkp->media_present = 0;
972 sdkp->capacity = 0;
973 sdkp->device->changed = 1;
974}
975
976/**
977 * sd_media_changed - check if our medium changed
978 * @disk: kernel device descriptor
979 *
980 * Returns 0 if not applicable or no change; 1 if change
981 *
982 * Note: this function is invoked from the block subsystem.
983 **/
984static int sd_media_changed(struct gendisk *disk)
985{
986 struct scsi_disk *sdkp = scsi_disk(disk);
987 struct scsi_device *sdp = sdkp->device;
James Bottomley001aac22007-12-02 19:10:40 +0200988 struct scsi_sense_hdr *sshdr = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 int retval;
990
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -0500991 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
993 if (!sdp->removable)
994 return 0;
995
996 /*
997 * If the device is offline, don't send any commands - just pretend as
998 * if the command failed. If the device ever comes back online, we
999 * can deal with it then. It is only because of unrecoverable errors
1000 * that we would ever take a device offline in the first place.
1001 */
Kay Sievers285e9672007-08-14 14:10:39 +02001002 if (!scsi_device_online(sdp)) {
1003 set_media_not_present(sdkp);
1004 retval = 1;
1005 goto out;
1006 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
1008 /*
1009 * Using TEST_UNIT_READY enables differentiation between drive with
1010 * no cartridge loaded - NOT READY, drive with changed cartridge -
1011 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1012 *
1013 * Drives that auto spin down. eg iomega jaz 1G, will be started
1014 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1015 * sd_revalidate() is called.
1016 */
1017 retval = -ENODEV;
Kay Sievers285e9672007-08-14 14:10:39 +02001018
James Bottomley001aac22007-12-02 19:10:40 +02001019 if (scsi_block_when_processing_errors(sdp)) {
1020 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1021 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1022 sshdr);
1023 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
1025 /*
1026 * Unable to test, unit probably not ready. This usually
1027 * means there is no disc in the drive. Mark as changed,
1028 * and we will figure it out later once the drive is
1029 * available again.
1030 */
James Bottomley001aac22007-12-02 19:10:40 +02001031 if (retval || (scsi_sense_valid(sshdr) &&
1032 /* 0x3a is medium not present */
1033 sshdr->asc == 0x3a)) {
Kay Sievers285e9672007-08-14 14:10:39 +02001034 set_media_not_present(sdkp);
1035 retval = 1;
1036 goto out;
1037 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
1039 /*
1040 * For removable scsi disk we have to recognise the presence
1041 * of a disk in the drive. This is kept in the struct scsi_disk
1042 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
1043 */
1044 sdkp->media_present = 1;
1045
1046 retval = sdp->changed;
1047 sdp->changed = 0;
Kay Sievers285e9672007-08-14 14:10:39 +02001048out:
1049 if (retval != sdkp->previous_state)
1050 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1051 sdkp->previous_state = retval;
James Bottomley001aac22007-12-02 19:10:40 +02001052 kfree(sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054}
1055
Martin K. Petersene73aec82007-02-27 22:40:55 -05001056static int sd_sync_cache(struct scsi_disk *sdkp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 int retries, res;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001059 struct scsi_device *sdp = sdkp->device;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001060 struct scsi_sense_hdr sshdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
1062 if (!scsi_device_online(sdp))
1063 return -ENODEV;
1064
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 for (retries = 3; retries > 0; --retries) {
1067 unsigned char cmd[10] = { 0 };
1068
1069 cmd[0] = SYNCHRONIZE_CACHE;
1070 /*
1071 * Leave the rest of the command zero to indicate
1072 * flush everything.
1073 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001074 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
Mike Christiee3b3e622010-08-11 11:06:25 -05001075 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001076 if (res == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 break;
1078 }
1079
Martin K. Petersene73aec82007-02-27 22:40:55 -05001080 if (res) {
1081 sd_print_result(sdkp, res);
1082 if (driver_byte(res) & DRIVER_SENSE)
1083 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 }
1085
Tejun Heo37210502007-03-21 00:07:18 +09001086 if (res)
1087 return -EIO;
1088 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089}
1090
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091static void sd_rescan(struct device *dev)
1092{
Alan Stern39b7f1e2005-11-04 14:44:41 -05001093 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1094
1095 if (sdkp) {
Andrew Pattersonf98a8ca2008-09-04 14:27:35 -06001096 revalidate_disk(sdkp->disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05001097 scsi_disk_put(sdkp);
1098 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099}
1100
1101
1102#ifdef CONFIG_COMPAT
1103/*
1104 * This gets directly called from VFS. When the ioctl
1105 * is not recognized we go back to the other translation paths.
1106 */
Al Viro0338e292008-03-02 10:41:04 -05001107static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1108 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109{
Al Viro0338e292008-03-02 10:41:04 -05001110 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111
1112 /*
1113 * If we are in the middle of error recovery, don't let anyone
1114 * else try and use this device. Also, if error recovery fails, it
1115 * may try and take the device offline, in which case all further
1116 * access to the device is prohibited.
1117 */
1118 if (!scsi_block_when_processing_errors(sdev))
1119 return -ENODEV;
1120
1121 if (sdev->host->hostt->compat_ioctl) {
1122 int ret;
1123
1124 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1125
1126 return ret;
1127 }
1128
1129 /*
1130 * Let the static ioctl translation table take care of it.
1131 */
1132 return -ENOIOCTLCMD;
1133}
1134#endif
1135
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -07001136static const struct block_device_operations sd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 .owner = THIS_MODULE,
Al Viro0338e292008-03-02 10:41:04 -05001138 .open = sd_open,
1139 .release = sd_release,
Arnd Bergmann8a6cfeb2010-07-08 10:18:46 +02001140 .ioctl = sd_ioctl,
Christoph Hellwiga885c8c2006-01-08 01:02:50 -08001141 .getgeo = sd_getgeo,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142#ifdef CONFIG_COMPAT
Al Viro0338e292008-03-02 10:41:04 -05001143 .compat_ioctl = sd_compat_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144#endif
1145 .media_changed = sd_media_changed,
1146 .revalidate_disk = sd_revalidate_disk,
Tejun Heo72ec24b2010-05-15 20:09:32 +02001147 .unlock_native_capacity = sd_unlock_native_capacity,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148};
1149
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001150static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1151{
Tejun Heo83096eb2009-05-07 22:24:39 +09001152 u64 start_lba = blk_rq_pos(scmd->request);
1153 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001154 u64 bad_lba;
1155 int info_valid;
1156
Christoph Hellwig33659eb2010-08-07 18:17:56 +02001157 if (scmd->request->cmd_type != REQ_TYPE_FS)
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001158 return 0;
1159
1160 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1161 SCSI_SENSE_BUFFERSIZE,
1162 &bad_lba);
1163 if (!info_valid)
1164 return 0;
1165
1166 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1167 return 0;
1168
1169 if (scmd->device->sector_size < 512) {
1170 /* only legitimate sector_size here is 256 */
1171 start_lba <<= 1;
1172 end_lba <<= 1;
1173 } else {
1174 /* be careful ... don't want any overflows */
1175 u64 factor = scmd->device->sector_size / 512;
1176 do_div(start_lba, factor);
1177 do_div(end_lba, factor);
1178 }
1179
1180 /* The bad lba was reported incorrectly, we have no idea where
1181 * the error is.
1182 */
1183 if (bad_lba < start_lba || bad_lba >= end_lba)
1184 return 0;
1185
1186 /* This computation should always be done in terms of
1187 * the resolution of the device's medium.
1188 */
1189 return (bad_lba - start_lba) * scmd->device->sector_size;
1190}
1191
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192/**
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001193 * sd_done - bottom half handler: called when the lower level
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 * driver has completed (successfully or otherwise) a scsi command.
1195 * @SCpnt: mid-level's per command structure.
1196 *
1197 * Note: potentially run from within an ISR. Must not block.
1198 **/
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001199static int sd_done(struct scsi_cmnd *SCpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200{
1201 int result = SCpnt->result;
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001202 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 struct scsi_sense_hdr sshdr;
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001204 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 int sense_valid = 0;
1206 int sense_deferred = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
FUJITA Tomonori6a32a8a2010-07-21 10:29:37 +09001208 if (SCpnt->request->cmd_flags & REQ_DISCARD) {
1209 if (!result)
1210 scsi_set_resid(SCpnt, 0);
1211 return good_bytes;
1212 }
1213
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 if (result) {
1215 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1216 if (sense_valid)
1217 sense_deferred = scsi_sense_is_deferred(&sshdr);
1218 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219#ifdef CONFIG_SCSI_LOGGING
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001220 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 if (sense_valid) {
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001222 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001223 "sd_done: sb[respc,sk,asc,"
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05001224 "ascq]=%x,%x,%x,%x\n",
1225 sshdr.response_code,
1226 sshdr.sense_key, sshdr.asc,
1227 sshdr.ascq));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 }
1229#endif
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001230 if (driver_byte(result) != DRIVER_SENSE &&
1231 (!sense_valid || sense_deferred))
1232 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001234 switch (sshdr.sense_key) {
1235 case HARDWARE_ERROR:
1236 case MEDIUM_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001237 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001238 break;
1239 case RECOVERED_ERROR:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001240 good_bytes = scsi_bufflen(SCpnt);
1241 break;
Jamie Wellnitz10dab222008-09-11 21:39:36 -04001242 case NO_SENSE:
1243 /* This indicates a false check condition, so ignore it. An
1244 * unknown amount of data was transferred so treat it as an
1245 * error.
1246 */
1247 scsi_print_sense("sd", SCpnt);
1248 SCpnt->result = 0;
1249 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1250 break;
Martin K. Petersenfa4698f2010-01-18 18:43:18 -05001251 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1252 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1253 if (sshdr.asc == 0x10)
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001254 good_bytes = sd_completed_bytes(SCpnt);
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001255 break;
1256 default:
1257 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 }
Luben Tuikov03aba2f2006-06-23 09:39:09 -07001259 out:
Martin K. Petersenaf55ff62008-07-17 04:28:35 -04001260 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1261 sd_dif_complete(SCpnt, good_bytes);
1262
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001263 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
Martin K. Petersen77c9cfc2010-01-20 02:20:43 -05001264 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1265
1266 /* We have to print a failed command here as the
1267 * extended CDB gets freed before scsi_io_completion()
1268 * is called.
1269 */
1270 if (result)
1271 scsi_print_command(SCpnt);
1272
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001273 mempool_free(SCpnt->cmnd, sd_cdb_pool);
Martin K. Petersen77c9cfc2010-01-20 02:20:43 -05001274 SCpnt->cmnd = NULL;
1275 SCpnt->cmd_len = 0;
1276 }
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001277
Linus Torvalds7b3d9542008-01-06 10:17:12 -08001278 return good_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279}
1280
James Bottomleyea73a9f2005-08-28 11:33:52 -05001281static int media_not_present(struct scsi_disk *sdkp,
1282 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
James Bottomleyea73a9f2005-08-28 11:33:52 -05001285 if (!scsi_sense_valid(sshdr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 return 0;
1287 /* not invoked for commands that could return deferred errors */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001288 if (sshdr->sense_key != NOT_READY &&
1289 sshdr->sense_key != UNIT_ATTENTION)
1290 return 0;
1291 if (sshdr->asc != 0x3A) /* medium not present */
1292 return 0;
1293
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 set_media_not_present(sdkp);
1295 return 1;
1296}
1297
1298/*
1299 * spinup disk - called only in sd_revalidate_disk()
1300 */
1301static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001302sd_spinup_disk(struct scsi_disk *sdkp)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001303{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 unsigned char cmd[10];
Alan Stern4451e472005-07-12 10:45:17 -04001305 unsigned long spintime_expire = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 int retries, spintime;
1307 unsigned int the_result;
1308 struct scsi_sense_hdr sshdr;
1309 int sense_valid = 0;
1310
1311 spintime = 0;
1312
1313 /* Spin up drives, as required. Only do this at boot time */
1314 /* Spinup needs to be done for module loads too. */
1315 do {
1316 retries = 0;
1317
1318 do {
1319 cmd[0] = TEST_UNIT_READY;
1320 memset((void *) &cmd[1], 0, 9);
1321
James Bottomleyea73a9f2005-08-28 11:33:52 -05001322 the_result = scsi_execute_req(sdkp->device, cmd,
1323 DMA_NONE, NULL, 0,
1324 &sshdr, SD_TIMEOUT,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001325 SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
Alan Sternb4d38e32006-10-11 16:48:28 -04001327 /*
1328 * If the drive has indicated to us that it
1329 * doesn't have any media in it, don't bother
1330 * with any more polling.
1331 */
1332 if (media_not_present(sdkp, &sshdr))
1333 return;
1334
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 if (the_result)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001336 sense_valid = scsi_sense_valid(&sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 retries++;
1338 } while (retries < 3 &&
1339 (!scsi_status_is_good(the_result) ||
1340 ((driver_byte(the_result) & DRIVER_SENSE) &&
1341 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1342
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1344 /* no sense, TUR either succeeded or failed
1345 * with a status error */
Martin K. Petersene73aec82007-02-27 22:40:55 -05001346 if(!spintime && !scsi_status_is_good(the_result)) {
1347 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1348 sd_print_result(sdkp, the_result);
1349 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 break;
1351 }
1352
1353 /*
1354 * The device does not want the automatic start to be issued.
1355 */
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001356 if (sdkp->device->no_start_on_add)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
Matthew Wilcox33dd6f92009-02-20 06:53:48 -07001359 if (sense_valid && sshdr.sense_key == NOT_READY) {
1360 if (sshdr.asc == 4 && sshdr.ascq == 3)
1361 break; /* manual intervention required */
1362 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1363 break; /* standby */
1364 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1365 break; /* unavailable */
1366 /*
1367 * Issue command to spin up drive when not ready
1368 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 if (!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001370 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 cmd[0] = START_STOP;
1372 cmd[1] = 1; /* Return immediately */
1373 memset((void *) &cmd[2], 0, 8);
1374 cmd[4] = 1; /* Start spin cycle */
Stefan Richterd2886ea2008-05-11 00:34:07 +02001375 if (sdkp->device->start_stop_pwr_cond)
1376 cmd[4] |= 1 << 4;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001377 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1378 NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001379 SD_TIMEOUT, SD_MAX_RETRIES,
1380 NULL);
Alan Stern4451e472005-07-12 10:45:17 -04001381 spintime_expire = jiffies + 100 * HZ;
1382 spintime = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 /* Wait 1 second for next try */
1385 msleep(1000);
1386 printk(".");
Alan Stern4451e472005-07-12 10:45:17 -04001387
1388 /*
1389 * Wait for USB flash devices with slow firmware.
1390 * Yes, this sense key/ASC combination shouldn't
1391 * occur here. It's characteristic of these devices.
1392 */
1393 } else if (sense_valid &&
1394 sshdr.sense_key == UNIT_ATTENTION &&
1395 sshdr.asc == 0x28) {
1396 if (!spintime) {
1397 spintime_expire = jiffies + 5 * HZ;
1398 spintime = 1;
1399 }
1400 /* Wait 1 second for next try */
1401 msleep(1000);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 } else {
1403 /* we don't understand the sense code, so it's
1404 * probably pointless to loop */
1405 if(!spintime) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001406 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1407 sd_print_sense_hdr(sdkp, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 }
1409 break;
1410 }
1411
Alan Stern4451e472005-07-12 10:45:17 -04001412 } while (spintime && time_before_eq(jiffies, spintime_expire));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
1414 if (spintime) {
1415 if (scsi_status_is_good(the_result))
1416 printk("ready\n");
1417 else
1418 printk("not responding...\n");
1419 }
1420}
1421
Martin K. Petersene0597d72008-07-17 04:28:34 -04001422
1423/*
1424 * Determine whether disk supports Data Integrity Field.
1425 */
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07001426static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04001427{
1428 struct scsi_device *sdp = sdkp->device;
1429 u8 type;
1430
1431 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001432 return;
1433
1434 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1435
1436 if (type == sdkp->protection_type || !sdkp->first_scan)
1437 return;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001438
Martin K. Petersenbe922f42008-09-19 18:47:20 -04001439 sdkp->protection_type = type;
1440
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04001441 if (type > SD_DIF_TYPE3_PROTECTION) {
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001442 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1443 "protection type %u. Disabling disk!\n", type);
1444 sdkp->capacity = 0;
1445 return;
Martin K. Petersene0597d72008-07-17 04:28:34 -04001446 }
1447
Martin K. Petersen35e1a5d2009-09-18 17:33:00 -04001448 if (scsi_host_dif_capable(sdp->host, type))
1449 sd_printk(KERN_NOTICE, sdkp,
1450 "Enabling DIF Type %u protection\n", type);
1451 else
1452 sd_printk(KERN_NOTICE, sdkp,
1453 "Disabling DIF Type %u protection\n", type);
Martin K. Petersene0597d72008-07-17 04:28:34 -04001454}
1455
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001456static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1457 struct scsi_sense_hdr *sshdr, int sense_valid,
1458 int the_result)
1459{
1460 sd_print_result(sdkp, the_result);
1461 if (driver_byte(the_result) & DRIVER_SENSE)
1462 sd_print_sense_hdr(sdkp, sshdr);
1463 else
1464 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1465
1466 /*
1467 * Set dirty bit for removable devices if not ready -
1468 * sometimes drives will not report this properly.
1469 */
1470 if (sdp->removable &&
1471 sense_valid && sshdr->sense_key == NOT_READY)
1472 sdp->changed = 1;
1473
1474 /*
1475 * We used to set media_present to 0 here to indicate no media
1476 * in the drive, but some drives fail read capacity even with
1477 * media present, so we can't do that.
1478 */
1479 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1480}
1481
1482#define RC16_LEN 32
1483#if RC16_LEN > SD_BUF_SIZE
1484#error RC16_LEN must not be more than SD_BUF_SIZE
1485#endif
1486
James Bottomley3233ac12010-04-01 10:30:01 -04001487#define READ_CAPACITY_RETRIES_ON_RESET 10
1488
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001489static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1490 unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001491{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 unsigned char cmd[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 struct scsi_sense_hdr sshdr;
1494 int sense_valid = 0;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001495 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04001496 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001497 unsigned int alignment;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001498 unsigned long long lba;
1499 unsigned sector_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
Hans de Goede5ce524b2010-10-01 14:20:10 -07001501 if (sdp->no_read_capacity_16)
1502 return -EINVAL;
1503
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 do {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001505 memset(cmd, 0, 16);
1506 cmd[0] = SERVICE_ACTION_IN;
1507 cmd[1] = SAI_READ_CAPACITY_16;
1508 cmd[13] = RC16_LEN;
1509 memset(buffer, 0, RC16_LEN);
1510
James Bottomleyea73a9f2005-08-28 11:33:52 -05001511 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001512 buffer, RC16_LEN, &sshdr,
1513 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514
James Bottomleyea73a9f2005-08-28 11:33:52 -05001515 if (media_not_present(sdkp, &sshdr))
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001516 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517
Matthew Wilcox2b301302009-03-12 14:20:30 -04001518 if (the_result) {
James Bottomleyea73a9f2005-08-28 11:33:52 -05001519 sense_valid = scsi_sense_valid(&sshdr);
Matthew Wilcox2b301302009-03-12 14:20:30 -04001520 if (sense_valid &&
1521 sshdr.sense_key == ILLEGAL_REQUEST &&
1522 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1523 sshdr.ascq == 0x00)
1524 /* Invalid Command Operation Code or
1525 * Invalid Field in CDB, just retry
1526 * silently with RC10 */
1527 return -EINVAL;
James Bottomley3233ac12010-04-01 10:30:01 -04001528 if (sense_valid &&
1529 sshdr.sense_key == UNIT_ATTENTION &&
1530 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1531 /* Device reset might occur several times,
1532 * give it one more chance */
1533 if (--reset_retries > 0)
1534 continue;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001535 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 retries--;
1537
1538 } while (the_result && retries);
1539
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001540 if (the_result) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001541 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001542 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1543 return -EINVAL;
1544 }
Martin K. Petersene73aec82007-02-27 22:40:55 -05001545
Dave Hansen8f76d152009-04-21 16:43:27 -07001546 sector_size = get_unaligned_be32(&buffer[8]);
1547 lba = get_unaligned_be64(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001548
1549 sd_read_protection_type(sdkp, buffer);
1550
1551 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1552 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1553 "kernel compiled with support for large block "
1554 "devices.\n");
1555 sdkp->capacity = 0;
1556 return -EOVERFLOW;
1557 }
1558
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001559 /* Logical blocks per physical block exponent */
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001560 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001561
1562 /* Lowest aligned logical block */
1563 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1564 blk_queue_alignment_offset(sdp->request_queue, alignment);
1565 if (alignment && sdkp->first_scan)
1566 sd_printk(KERN_NOTICE, sdkp,
1567 "physical block alignment offset: %u\n", alignment);
1568
Martin K. Petersene339c1a2009-11-26 12:00:40 -05001569 if (buffer[14] & 0x80) { /* TPE */
1570 struct request_queue *q = sdp->request_queue;
1571
1572 sdkp->thin_provisioning = 1;
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001573 q->limits.discard_granularity = sdkp->physical_block_size;
Martin K. Petersene339c1a2009-11-26 12:00:40 -05001574 q->limits.max_discard_sectors = 0xffffffff;
1575
1576 if (buffer[14] & 0x40) /* TPRZ */
1577 q->limits.discard_zeroes_data = 1;
1578
1579 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1580 }
1581
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001582 sdkp->capacity = lba + 1;
1583 return sector_size;
1584}
1585
1586static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1587 unsigned char *buffer)
1588{
1589 unsigned char cmd[16];
1590 struct scsi_sense_hdr sshdr;
1591 int sense_valid = 0;
1592 int the_result;
James Bottomley3233ac12010-04-01 10:30:01 -04001593 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001594 sector_t lba;
1595 unsigned sector_size;
1596
1597 do {
1598 cmd[0] = READ_CAPACITY;
1599 memset(&cmd[1], 0, 9);
1600 memset(buffer, 0, 8);
1601
1602 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1603 buffer, 8, &sshdr,
1604 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1605
1606 if (media_not_present(sdkp, &sshdr))
1607 return -ENODEV;
1608
James Bottomley3233ac12010-04-01 10:30:01 -04001609 if (the_result) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001610 sense_valid = scsi_sense_valid(&sshdr);
James Bottomley3233ac12010-04-01 10:30:01 -04001611 if (sense_valid &&
1612 sshdr.sense_key == UNIT_ATTENTION &&
1613 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1614 /* Device reset might occur several times,
1615 * give it one more chance */
1616 if (--reset_retries > 0)
1617 continue;
1618 }
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001619 retries--;
1620
1621 } while (the_result && retries);
1622
1623 if (the_result) {
1624 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1625 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1626 return -EINVAL;
1627 }
1628
Dave Hansen8f76d152009-04-21 16:43:27 -07001629 sector_size = get_unaligned_be32(&buffer[4]);
1630 lba = get_unaligned_be32(&buffer[0]);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001631
Hans de Goede5ce524b2010-10-01 14:20:10 -07001632 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1633 /* Some buggy (usb cardreader) devices return an lba of
1634 0xffffffff when the want to report a size of 0 (with
1635 which they really mean no media is present) */
1636 sdkp->capacity = 0;
Linus Torvalds5cc10352010-10-22 20:30:48 -07001637 sdkp->physical_block_size = sector_size;
Hans de Goede5ce524b2010-10-01 14:20:10 -07001638 return sector_size;
1639 }
1640
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001641 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1642 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1643 "kernel compiled with support for large block "
1644 "devices.\n");
1645 sdkp->capacity = 0;
1646 return -EOVERFLOW;
1647 }
1648
1649 sdkp->capacity = lba + 1;
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001650 sdkp->physical_block_size = sector_size;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001651 return sector_size;
1652}
1653
Matthew Wilcox2b301302009-03-12 14:20:30 -04001654static int sd_try_rc16_first(struct scsi_device *sdp)
1655{
Hannes Reineckef87146b2010-03-29 09:29:24 +02001656 if (sdp->host->max_cmd_len < 16)
1657 return 0;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001658 if (sdp->scsi_level > SCSI_SPC_2)
1659 return 1;
1660 if (scsi_device_protection(sdp))
1661 return 1;
1662 return 0;
1663}
1664
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001665/*
1666 * read disk capacity
1667 */
1668static void
1669sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1670{
1671 int sector_size;
1672 struct scsi_device *sdp = sdkp->device;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001673 sector_t old_capacity = sdkp->capacity;
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001674
Matthew Wilcox2b301302009-03-12 14:20:30 -04001675 if (sd_try_rc16_first(sdp)) {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001676 sector_size = read_capacity_16(sdkp, sdp, buffer);
1677 if (sector_size == -EOVERFLOW)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678 goto got_data;
Matthew Wilcox2b301302009-03-12 14:20:30 -04001679 if (sector_size == -ENODEV)
1680 return;
1681 if (sector_size < 0)
1682 sector_size = read_capacity_10(sdkp, sdp, buffer);
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001683 if (sector_size < 0)
1684 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 } else {
Matthew Wilcox0da205e2009-03-12 14:20:29 -04001686 sector_size = read_capacity_10(sdkp, sdp, buffer);
1687 if (sector_size == -EOVERFLOW)
1688 goto got_data;
1689 if (sector_size < 0)
1690 return;
1691 if ((sizeof(sdkp->capacity) > 4) &&
1692 (sdkp->capacity > 0xffffffffULL)) {
1693 int old_sector_size = sector_size;
1694 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1695 "Trying to use READ CAPACITY(16).\n");
1696 sector_size = read_capacity_16(sdkp, sdp, buffer);
1697 if (sector_size < 0) {
1698 sd_printk(KERN_NOTICE, sdkp,
1699 "Using 0xffffffff as device size\n");
1700 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1701 sector_size = old_sector_size;
1702 goto got_data;
1703 }
1704 }
1705 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706
Alan Stern5c211ca2009-02-18 10:54:44 -05001707 /* Some devices are known to return the total number of blocks,
1708 * not the highest block number. Some devices have versions
1709 * which do this and others which do not. Some devices we might
1710 * suspect of doing this but we don't know for certain.
1711 *
1712 * If we know the reported capacity is wrong, decrement it. If
1713 * we can only guess, then assume the number of blocks is even
1714 * (usually true but not always) and err on the side of lowering
1715 * the capacity.
1716 */
1717 if (sdp->fix_capacity ||
1718 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1719 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1720 "from its reported value: %llu\n",
1721 (unsigned long long) sdkp->capacity);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 --sdkp->capacity;
Oliver Neukum61bf54b2007-02-08 09:04:48 +01001723 }
1724
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725got_data:
1726 if (sector_size == 0) {
1727 sector_size = 512;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001728 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1729 "assuming 512.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 }
1731
1732 if (sector_size != 512 &&
1733 sector_size != 1024 &&
1734 sector_size != 2048 &&
1735 sector_size != 4096 &&
1736 sector_size != 256) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001737 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1738 sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 /*
1740 * The user might want to re-format the drive with
1741 * a supported sectorsize. Once this happens, it
1742 * would be relatively trivial to set the thing up.
1743 * For this reason, we leave the thing in the table.
1744 */
1745 sdkp->capacity = 0;
1746 /*
1747 * set a bogus sector size so the normal read/write
1748 * logic in the block layer will eventually refuse any
1749 * request on this device without tripping over power
1750 * of two sector size assumptions
1751 */
1752 sector_size = 512;
1753 }
Martin K. Petersene1defc42009-05-22 17:17:49 -04001754 blk_queue_logical_block_size(sdp->request_queue, sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755
James Bottomley7404ad3b2008-08-31 10:41:52 -05001756 {
1757 char cap_str_2[10], cap_str_10[10];
H. Peter Anvin520a2c22008-10-14 11:34:20 -07001758 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
James Bottomley7404ad3b2008-08-31 10:41:52 -05001759
1760 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1761 sizeof(cap_str_2));
1762 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1763 sizeof(cap_str_10));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001765 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001766 sd_printk(KERN_NOTICE, sdkp,
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001767 "%llu %d-byte logical blocks: (%s/%s)\n",
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001768 (unsigned long long)sdkp->capacity,
1769 sector_size, cap_str_10, cap_str_2);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001770
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001771 if (sdkp->physical_block_size != sector_size)
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001772 sd_printk(KERN_NOTICE, sdkp,
1773 "%u-byte physical blocks\n",
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001774 sdkp->physical_block_size);
Martin K. Petersenea09bcc2009-05-23 11:43:37 -04001775 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 }
1777
1778 /* Rescale capacity to 512-byte units */
1779 if (sector_size == 4096)
1780 sdkp->capacity <<= 3;
1781 else if (sector_size == 2048)
1782 sdkp->capacity <<= 2;
1783 else if (sector_size == 1024)
1784 sdkp->capacity <<= 1;
1785 else if (sector_size == 256)
1786 sdkp->capacity >>= 1;
1787
Martin K. Petersen526f7c72010-09-28 14:48:47 -04001788 blk_queue_physical_block_size(sdp->request_queue,
1789 sdkp->physical_block_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 sdkp->device->sector_size = sector_size;
1791}
1792
1793/* called with buffer of length 512 */
1794static inline int
James Bottomleyea73a9f2005-08-28 11:33:52 -05001795sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1796 unsigned char *buffer, int len, struct scsi_mode_data *data,
1797 struct scsi_sense_hdr *sshdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798{
James Bottomleyea73a9f2005-08-28 11:33:52 -05001799 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
James Bottomley1cf72692005-08-28 11:27:01 -05001800 SD_TIMEOUT, SD_MAX_RETRIES, data,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001801 sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802}
1803
1804/*
1805 * read write protect setting, if possible - called only in sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001806 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 */
1808static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001809sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
James Bottomleyea73a9f2005-08-28 11:33:52 -05001810{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 int res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001812 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 struct scsi_mode_data data;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001814 int old_wp = sdkp->write_prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815
1816 set_disk_ro(sdkp->disk, 0);
James Bottomleyea73a9f2005-08-28 11:33:52 -05001817 if (sdp->skip_ms_page_3f) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001818 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 return;
1820 }
1821
James Bottomleyea73a9f2005-08-28 11:33:52 -05001822 if (sdp->use_192_bytes_for_3f) {
1823 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 } else {
1825 /*
1826 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1827 * We have to start carefully: some devices hang if we ask
1828 * for more than is available.
1829 */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001830 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831
1832 /*
1833 * Second attempt: ask for page 0 When only page 0 is
1834 * implemented, a request for page 3F may return Sense Key
1835 * 5: Illegal Request, Sense Code 24: Invalid field in
1836 * CDB.
1837 */
1838 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001839 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840
1841 /*
1842 * Third attempt: ask 255 bytes, as we did earlier.
1843 */
1844 if (!scsi_status_is_good(res))
James Bottomleyea73a9f2005-08-28 11:33:52 -05001845 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1846 &data, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 }
1848
1849 if (!scsi_status_is_good(res)) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001850 sd_printk(KERN_WARNING, sdkp,
1851 "Test WP failed, assume Write Enabled\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 } else {
1853 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1854 set_disk_ro(sdkp->disk, sdkp->write_prot);
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001855 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1856 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1857 sdkp->write_prot ? "on" : "off");
1858 sd_printk(KERN_DEBUG, sdkp,
1859 "Mode Sense: %02x %02x %02x %02x\n",
1860 buffer[0], buffer[1], buffer[2], buffer[3]);
1861 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 }
1863}
1864
1865/*
1866 * sd_read_cache_type - called only from sd_revalidate_disk()
Al Viro48970802006-02-26 08:34:10 -06001867 * called with buffer of length SD_BUF_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 */
1869static void
Martin K. Petersene73aec82007-02-27 22:40:55 -05001870sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
Al Viro 631e8a12005-05-16 01:59:55 +01001871{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 int len = 0, res;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001873 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874
Al Viro 631e8a12005-05-16 01:59:55 +01001875 int dbd;
1876 int modepage;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 struct scsi_mode_data data;
1878 struct scsi_sense_hdr sshdr;
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001879 int old_wce = sdkp->WCE;
1880 int old_rcd = sdkp->RCD;
1881 int old_dpofua = sdkp->DPOFUA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882
James Bottomleyea73a9f2005-08-28 11:33:52 -05001883 if (sdp->skip_ms_page_8)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 goto defaults;
1885
James Bottomleyea73a9f2005-08-28 11:33:52 -05001886 if (sdp->type == TYPE_RBC) {
Al Viro 631e8a12005-05-16 01:59:55 +01001887 modepage = 6;
1888 dbd = 8;
1889 } else {
1890 modepage = 8;
1891 dbd = 0;
1892 }
1893
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 /* cautiously ask */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001895 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896
1897 if (!scsi_status_is_good(res))
1898 goto bad_sense;
1899
Al Viro6d73c852006-02-23 02:03:16 +01001900 if (!data.header_length) {
1901 modepage = 6;
Martin K. Petersene73aec82007-02-27 22:40:55 -05001902 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
Al Viro6d73c852006-02-23 02:03:16 +01001903 }
1904
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 /* that went OK, now ask for the proper length */
1906 len = data.length;
1907
1908 /*
1909 * We're only interested in the first three bytes, actually.
1910 * But the data cache page is defined for the first 20.
1911 */
1912 if (len < 3)
1913 goto bad_sense;
1914 if (len > 20)
1915 len = 20;
1916
1917 /* Take headers and block descriptors into account */
1918 len += data.header_length + data.block_descriptor_length;
Al Viro48970802006-02-26 08:34:10 -06001919 if (len > SD_BUF_SIZE)
1920 goto bad_sense;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921
1922 /* Get the data */
James Bottomleyea73a9f2005-08-28 11:33:52 -05001923 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
1925 if (scsi_status_is_good(res)) {
Al Viro 631e8a12005-05-16 01:59:55 +01001926 int offset = data.header_length + data.block_descriptor_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927
Al Viro48970802006-02-26 08:34:10 -06001928 if (offset >= SD_BUF_SIZE - 2) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001929 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
Al Viro48970802006-02-26 08:34:10 -06001930 goto defaults;
1931 }
1932
Al Viro 631e8a12005-05-16 01:59:55 +01001933 if ((buffer[offset] & 0x3f) != modepage) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001934 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
Al Viro 631e8a12005-05-16 01:59:55 +01001935 goto defaults;
1936 }
1937
1938 if (modepage == 8) {
1939 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1940 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1941 } else {
1942 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1943 sdkp->RCD = 0;
1944 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945
Tejun Heo007365a2006-01-06 09:53:52 +01001946 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1947 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05001948 sd_printk(KERN_NOTICE, sdkp,
1949 "Uses READ/WRITE(6), disabling FUA\n");
Tejun Heo007365a2006-01-06 09:53:52 +01001950 sdkp->DPOFUA = 0;
1951 }
1952
Martin K. Petersen70a9b872009-03-09 11:33:31 -04001953 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1954 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1955 sd_printk(KERN_NOTICE, sdkp,
1956 "Write cache: %s, read cache: %s, %s\n",
1957 sdkp->WCE ? "enabled" : "disabled",
1958 sdkp->RCD ? "disabled" : "enabled",
1959 sdkp->DPOFUA ? "supports DPO and FUA"
1960 : "doesn't support DPO or FUA");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961
1962 return;
1963 }
1964
1965bad_sense:
James Bottomleyea73a9f2005-08-28 11:33:52 -05001966 if (scsi_sense_valid(&sshdr) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 sshdr.sense_key == ILLEGAL_REQUEST &&
1968 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
Martin K. Petersene73aec82007-02-27 22:40:55 -05001969 /* Invalid field in CDB */
1970 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 else
Martin K. Petersene73aec82007-02-27 22:40:55 -05001972 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973
1974defaults:
Martin K. Petersene73aec82007-02-27 22:40:55 -05001975 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 sdkp->WCE = 0;
1977 sdkp->RCD = 0;
Al Viro48970802006-02-26 08:34:10 -06001978 sdkp->DPOFUA = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979}
1980
Martin K. Petersene0597d72008-07-17 04:28:34 -04001981/*
1982 * The ATO bit indicates whether the DIF application tag is available
1983 * for use by the operating system.
1984 */
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07001985static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
Martin K. Petersene0597d72008-07-17 04:28:34 -04001986{
1987 int res, offset;
1988 struct scsi_device *sdp = sdkp->device;
1989 struct scsi_mode_data data;
1990 struct scsi_sense_hdr sshdr;
1991
1992 if (sdp->type != TYPE_DISK)
1993 return;
1994
1995 if (sdkp->protection_type == 0)
1996 return;
1997
1998 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1999 SD_MAX_RETRIES, &data, &sshdr);
2000
2001 if (!scsi_status_is_good(res) || !data.header_length ||
2002 data.length < 6) {
2003 sd_printk(KERN_WARNING, sdkp,
2004 "getting Control mode page failed, assume no ATO\n");
2005
2006 if (scsi_sense_valid(&sshdr))
2007 sd_print_sense_hdr(sdkp, &sshdr);
2008
2009 return;
2010 }
2011
2012 offset = data.header_length + data.block_descriptor_length;
2013
2014 if ((buffer[offset] & 0x3f) != 0x0a) {
2015 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2016 return;
2017 }
2018
2019 if ((buffer[offset + 5] & 0x80) == 0)
2020 return;
2021
2022 sdkp->ATO = 1;
2023
2024 return;
2025}
2026
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027/**
Martin K. Petersend11b6912009-05-23 11:43:39 -04002028 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2029 * @disk: disk to query
2030 */
2031static void sd_read_block_limits(struct scsi_disk *sdkp)
2032{
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002033 struct request_queue *q = sdkp->disk->queue;
Martin K. Petersend11b6912009-05-23 11:43:39 -04002034 unsigned int sector_sz = sdkp->device->sector_size;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002035 const int vpd_len = 64;
James Bottomleye3deec02009-11-03 12:33:07 -06002036 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersend11b6912009-05-23 11:43:39 -04002037
James Bottomleye3deec02009-11-03 12:33:07 -06002038 if (!buffer ||
2039 /* Block Limits VPD */
2040 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2041 goto out;
Martin K. Petersend11b6912009-05-23 11:43:39 -04002042
2043 blk_queue_io_min(sdkp->disk->queue,
2044 get_unaligned_be16(&buffer[6]) * sector_sz);
2045 blk_queue_io_opt(sdkp->disk->queue,
2046 get_unaligned_be32(&buffer[12]) * sector_sz);
2047
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002048 /* Thin provisioning enabled and page length indicates TP support */
2049 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2050 unsigned int lba_count, desc_count, granularity;
2051
2052 lba_count = get_unaligned_be32(&buffer[20]);
2053 desc_count = get_unaligned_be32(&buffer[24]);
2054
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002055 if (lba_count && desc_count) {
2056 if (sdkp->tpvpd && !sdkp->tpu)
2057 sdkp->unmap = 0;
2058 else
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002059 sdkp->unmap = 1;
2060 }
2061
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002062 if (sdkp->tpvpd && !sdkp->tpu && !sdkp->tpws) {
2063 sd_printk(KERN_ERR, sdkp, "Thin provisioning is " \
2064 "enabled but neither TPU, nor TPWS are " \
2065 "set. Disabling discard!\n");
2066 goto out;
2067 }
2068
2069 if (lba_count)
2070 q->limits.max_discard_sectors =
2071 lba_count * sector_sz >> 9;
2072
Martin K. Petersene339c1a2009-11-26 12:00:40 -05002073 granularity = get_unaligned_be32(&buffer[28]);
2074
2075 if (granularity)
2076 q->limits.discard_granularity = granularity * sector_sz;
2077
2078 if (buffer[32] & 0x80)
2079 q->limits.discard_alignment =
2080 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2081 }
2082
James Bottomleye3deec02009-11-03 12:33:07 -06002083 out:
Martin K. Petersend11b6912009-05-23 11:43:39 -04002084 kfree(buffer);
2085}
2086
2087/**
Martin K. Petersen3821d762009-05-23 11:43:38 -04002088 * sd_read_block_characteristics - Query block dev. characteristics
2089 * @disk: disk to query
2090 */
2091static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2092{
James Bottomleye3deec02009-11-03 12:33:07 -06002093 unsigned char *buffer;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002094 u16 rot;
Martin K. Petersenbb2d3de2010-03-02 08:44:34 -05002095 const int vpd_len = 64;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002096
James Bottomleye3deec02009-11-03 12:33:07 -06002097 buffer = kmalloc(vpd_len, GFP_KERNEL);
Martin K. Petersen3821d762009-05-23 11:43:38 -04002098
James Bottomleye3deec02009-11-03 12:33:07 -06002099 if (!buffer ||
2100 /* Block Device Characteristics VPD */
2101 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2102 goto out;
Martin K. Petersen3821d762009-05-23 11:43:38 -04002103
2104 rot = get_unaligned_be16(&buffer[4]);
2105
2106 if (rot == 1)
2107 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2108
James Bottomleye3deec02009-11-03 12:33:07 -06002109 out:
Martin K. Petersen3821d762009-05-23 11:43:38 -04002110 kfree(buffer);
2111}
2112
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002113/**
2114 * sd_read_thin_provisioning - Query thin provisioning VPD page
2115 * @disk: disk to query
2116 */
2117static void sd_read_thin_provisioning(struct scsi_disk *sdkp)
2118{
2119 unsigned char *buffer;
2120 const int vpd_len = 8;
2121
2122 if (sdkp->thin_provisioning == 0)
2123 return;
2124
2125 buffer = kmalloc(vpd_len, GFP_KERNEL);
2126
2127 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2128 goto out;
2129
2130 sdkp->tpvpd = 1;
2131 sdkp->tpu = (buffer[5] >> 7) & 1; /* UNMAP */
2132 sdkp->tpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2133
2134 out:
2135 kfree(buffer);
2136}
2137
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002138static int sd_try_extended_inquiry(struct scsi_device *sdp)
2139{
2140 /*
2141 * Although VPD inquiries can go to SCSI-2 type devices,
2142 * some USB ones crash on receiving them, and the pages
2143 * we currently ask for are for SPC-3 and beyond
2144 */
2145 if (sdp->scsi_level > SCSI_SPC_2)
2146 return 1;
2147 return 0;
2148}
2149
Martin K. Petersen3821d762009-05-23 11:43:38 -04002150/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002151 * sd_revalidate_disk - called the first time a new disk is seen,
2152 * performs disk spin up, read_capacity, etc.
2153 * @disk: struct gendisk we care about
2154 **/
2155static int sd_revalidate_disk(struct gendisk *disk)
2156{
2157 struct scsi_disk *sdkp = scsi_disk(disk);
2158 struct scsi_device *sdp = sdkp->device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 unsigned char *buffer;
Tejun Heo4913efe2010-09-03 11:56:16 +02002160 unsigned flush = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161
Martin K. Petersenfa0d34b2007-02-27 22:41:19 -05002162 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2163 "sd_revalidate_disk\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164
2165 /*
2166 * If the device is offline, don't try and read capacity or any
2167 * of the other niceties.
2168 */
2169 if (!scsi_device_online(sdp))
2170 goto out;
2171
Bernhard Wallea6123f12007-05-21 17:15:26 +02002172 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 if (!buffer) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002174 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2175 "allocation failure.\n");
James Bottomleyea73a9f2005-08-28 11:33:52 -05002176 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177 }
2178
Martin K. Petersene73aec82007-02-27 22:40:55 -05002179 sd_spinup_disk(sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180
2181 /*
2182 * Without media there is no reason to ask; moreover, some devices
2183 * react badly if we do.
2184 */
2185 if (sdkp->media_present) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002186 sd_read_capacity(sdkp, buffer);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002187
2188 if (sd_try_extended_inquiry(sdp)) {
Martin K. Petersen045d3fe2010-09-10 01:22:07 -04002189 sd_read_thin_provisioning(sdkp);
Martin K. Petersenffd4bc22009-07-29 14:06:53 -04002190 sd_read_block_limits(sdkp);
2191 sd_read_block_characteristics(sdkp);
2192 }
2193
Martin K. Petersene73aec82007-02-27 22:40:55 -05002194 sd_read_write_protect_flag(sdkp, buffer);
2195 sd_read_cache_type(sdkp, buffer);
Martin K. Petersene0597d72008-07-17 04:28:34 -04002196 sd_read_app_tag_own(sdkp, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002197 }
Tejun Heo461d4e92006-01-06 09:52:55 +01002198
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002199 sdkp->first_scan = 0;
2200
Tejun Heo461d4e92006-01-06 09:52:55 +01002201 /*
2202 * We now have all cache related info, determine how we deal
Tejun Heo4913efe2010-09-03 11:56:16 +02002203 * with flush requests.
Tejun Heo461d4e92006-01-06 09:52:55 +01002204 */
Tejun Heo4913efe2010-09-03 11:56:16 +02002205 if (sdkp->WCE) {
2206 flush |= REQ_FLUSH;
2207 if (sdkp->DPOFUA)
2208 flush |= REQ_FUA;
2209 }
Tejun Heo461d4e92006-01-06 09:52:55 +01002210
Tejun Heo4913efe2010-09-03 11:56:16 +02002211 blk_queue_flush(sdkp->disk->queue, flush);
Tejun Heo461d4e92006-01-06 09:52:55 +01002212
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213 set_capacity(disk, sdkp->capacity);
2214 kfree(buffer);
2215
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216 out:
2217 return 0;
2218}
2219
2220/**
Tejun Heo72ec24b2010-05-15 20:09:32 +02002221 * sd_unlock_native_capacity - unlock native capacity
2222 * @disk: struct gendisk to set capacity for
2223 *
2224 * Block layer calls this function if it detects that partitions
2225 * on @disk reach beyond the end of the device. If the SCSI host
2226 * implements ->unlock_native_capacity() method, it's invoked to
2227 * give it a chance to adjust the device capacity.
2228 *
2229 * CONTEXT:
2230 * Defined by block layer. Might sleep.
2231 */
2232static void sd_unlock_native_capacity(struct gendisk *disk)
2233{
2234 struct scsi_device *sdev = scsi_disk(disk)->device;
2235
2236 if (sdev->host->hostt->unlock_native_capacity)
2237 sdev->host->hostt->unlock_native_capacity(sdev);
2238}
2239
2240/**
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002241 * sd_format_disk_name - format disk name
2242 * @prefix: name prefix - ie. "sd" for SCSI disks
2243 * @index: index of the disk to format name for
2244 * @buf: output buffer
2245 * @buflen: length of the output buffer
2246 *
2247 * SCSI disk names starts at sda. The 26th device is sdz and the
2248 * 27th is sdaa. The last one for two lettered suffix is sdzz
2249 * which is followed by sdaaa.
2250 *
2251 * This is basically 26 base counting with one extra 'nil' entry
Daniel Mack3ad2f3f2010-02-03 08:01:28 +08002252 * at the beginning from the second digit on and can be
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002253 * determined using similar method as 26 base conversion with the
2254 * index shifted -1 after each digit is computed.
2255 *
2256 * CONTEXT:
2257 * Don't care.
2258 *
2259 * RETURNS:
2260 * 0 on success, -errno on failure.
2261 */
2262static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2263{
2264 const int base = 'z' - 'a' + 1;
2265 char *begin = buf + strlen(prefix);
2266 char *end = buf + buflen;
2267 char *p;
2268 int unit;
2269
2270 p = end - 1;
2271 *p = '\0';
2272 unit = base;
2273 do {
2274 if (p == begin)
2275 return -EINVAL;
2276 *--p = 'a' + (index % unit);
2277 index = (index / unit) - 1;
2278 } while (index >= 0);
2279
2280 memmove(begin, p, end - p);
2281 memcpy(buf, prefix, strlen(prefix));
2282
2283 return 0;
2284}
2285
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002286/*
2287 * The asynchronous part of sd_probe
2288 */
2289static void sd_probe_async(void *data, async_cookie_t cookie)
2290{
2291 struct scsi_disk *sdkp = data;
2292 struct scsi_device *sdp;
2293 struct gendisk *gd;
2294 u32 index;
2295 struct device *dev;
2296
2297 sdp = sdkp->device;
2298 gd = sdkp->disk;
2299 index = sdkp->index;
2300 dev = &sdp->sdev_gendev;
2301
Michael Reed1a03ae02010-09-20 11:20:22 -05002302 gd->major = sd_major((index & 0xf0) >> 4);
2303 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2304 gd->minors = SD_MINORS;
2305
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002306 gd->fops = &sd_fops;
2307 gd->private_data = &sdkp->driver;
2308 gd->queue = sdkp->device->request_queue;
2309
Martin K. Petersen70a9b872009-03-09 11:33:31 -04002310 /* defaults, until the device tells us otherwise */
2311 sdp->sector_size = 512;
2312 sdkp->capacity = 0;
2313 sdkp->media_present = 1;
2314 sdkp->write_prot = 0;
2315 sdkp->WCE = 0;
2316 sdkp->RCD = 0;
2317 sdkp->ATO = 0;
2318 sdkp->first_scan = 1;
2319
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002320 sd_revalidate_disk(gd);
2321
2322 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
FUJITA Tomonorif1126e92010-07-01 19:49:18 +09002323 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002324
2325 gd->driverfs_dev = &sdp->sdev_gendev;
NeilBrown97fedbb2010-03-16 08:55:32 +01002326 gd->flags = GENHD_FL_EXT_DEVT;
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002327 if (sdp->removable)
2328 gd->flags |= GENHD_FL_REMOVABLE;
2329
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002330 add_disk(gd);
2331 sd_dif_config_host(sdkp);
2332
Martin K. Petersen3821d762009-05-23 11:43:38 -04002333 sd_revalidate_disk(gd);
2334
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002335 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2336 sdp->removable ? "removable " : "");
Alan Stern478a8a02010-06-16 14:52:17 -04002337 scsi_autopm_put_device(sdp);
James Bottomleyea038f62009-08-21 09:47:54 -06002338 put_device(&sdkp->dev);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002339}
2340
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002341/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 * sd_probe - called during driver initialization and whenever a
2343 * new scsi device is attached to the system. It is called once
2344 * for each scsi device (not just disks) present.
2345 * @dev: pointer to device object
2346 *
2347 * Returns 0 if successful (or not interested in this scsi device
2348 * (e.g. scanner)); 1 when there is an error.
2349 *
2350 * Note: this function is invoked from the scsi mid-level.
2351 * This function sets up the mapping between a given
2352 * <host,channel,id,lun> (found in sdp) and new device name
2353 * (e.g. /dev/sda). More precisely it is the block device major
2354 * and minor number that is chosen here.
2355 *
2356 * Assume sd_attach is not re-entrant (for time being)
2357 * Also think about sd_attach() and sd_remove() running coincidentally.
2358 **/
2359static int sd_probe(struct device *dev)
2360{
2361 struct scsi_device *sdp = to_scsi_device(dev);
2362 struct scsi_disk *sdkp;
2363 struct gendisk *gd;
H Hartley Sweeten439d77f2010-08-10 18:01:20 -07002364 int index;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365 int error;
2366
2367 error = -ENODEV;
Al Viro 631e8a12005-05-16 01:59:55 +01002368 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369 goto out;
2370
James Bottomley9ccfc752005-10-02 11:45:08 -05002371 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2372 "sd_attach\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373
2374 error = -ENOMEM;
Jes Sorensen24669f752006-01-16 10:31:18 -05002375 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002376 if (!sdkp)
2377 goto out;
2378
Tejun Heo689d6fa2008-08-25 19:56:16 +09002379 gd = alloc_disk(SD_MINORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 if (!gd)
2381 goto out_free;
2382
Tejun Heof27bac22008-07-14 14:59:30 +09002383 do {
2384 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2385 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386
Tejun Heo4034cc62009-02-21 11:04:45 +09002387 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002388 error = ida_get_new(&sd_index_ida, &index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002389 spin_unlock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002390 } while (error == -EAGAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 if (error)
2393 goto out_put;
2394
Michael Reed1a03ae02010-09-20 11:20:22 -05002395 if (index >= SD_MAX_DISKS) {
2396 error = -ENODEV;
2397 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n");
2398 goto out_free_index;
2399 }
2400
Tejun Heo3e1a7ff2008-08-25 19:56:17 +09002401 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2402 if (error)
Tejun Heof27bac22008-07-14 14:59:30 +09002403 goto out_free_index;
2404
Linus Torvalds1da177e2005-04-16 15:20:36 -07002405 sdkp->device = sdp;
2406 sdkp->driver = &sd_template;
2407 sdkp->disk = gd;
2408 sdkp->index = index;
Arnd Bergmann409f3492010-07-07 16:51:29 +02002409 atomic_set(&sdkp->openers, 0);
Kay Sieversc02e6002008-03-19 13:09:56 +01002410 sdkp->previous_state = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411
James Bottomley601e7632009-05-26 20:35:48 +00002412 if (!sdp->request_queue->rq_timeout) {
2413 if (sdp->type != TYPE_MOD)
2414 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2415 else
2416 blk_queue_rq_timeout(sdp->request_queue,
2417 SD_MOD_TIMEOUT);
2418 }
2419
2420 device_initialize(&sdkp->dev);
Alan Stern478a8a02010-06-16 14:52:17 -04002421 sdkp->dev.parent = dev;
James Bottomley601e7632009-05-26 20:35:48 +00002422 sdkp->dev.class = &sd_disk_class;
Alan Stern478a8a02010-06-16 14:52:17 -04002423 dev_set_name(&sdkp->dev, dev_name(dev));
James Bottomley601e7632009-05-26 20:35:48 +00002424
2425 if (device_add(&sdkp->dev))
2426 goto out_free_index;
2427
Alan Stern478a8a02010-06-16 14:52:17 -04002428 get_device(dev);
2429 dev_set_drvdata(dev, sdkp);
James Bottomley601e7632009-05-26 20:35:48 +00002430
James Bottomleyea038f62009-08-21 09:47:54 -06002431 get_device(&sdkp->dev); /* prevent release before async_schedule */
Arjan van de Ven4ace92f2009-01-04 05:32:28 -08002432 async_schedule(sd_probe_async, sdkp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433
2434 return 0;
2435
Tejun Heof27bac22008-07-14 14:59:30 +09002436 out_free_index:
Tejun Heo4034cc62009-02-21 11:04:45 +09002437 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002438 ida_remove(&sd_index_ida, index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002439 spin_unlock(&sd_index_lock);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002440 out_put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002441 put_disk(gd);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002442 out_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002443 kfree(sdkp);
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002444 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445 return error;
2446}
2447
2448/**
2449 * sd_remove - called whenever a scsi disk (previously recognized by
2450 * sd_probe) is detached from the system. It is called (potentially
2451 * multiple times) during sd module unload.
2452 * @sdp: pointer to mid level scsi device object
2453 *
2454 * Note: this function is invoked from the scsi mid-level.
2455 * This function potentially frees up a device name (e.g. /dev/sdc)
2456 * that could be re-used by a subsequent sd_probe().
2457 * This function is not called when the built-in sd driver is "exit-ed".
2458 **/
2459static int sd_remove(struct device *dev)
2460{
James Bottomley601e7632009-05-26 20:35:48 +00002461 struct scsi_disk *sdkp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462
James Bottomley601e7632009-05-26 20:35:48 +00002463 sdkp = dev_get_drvdata(dev);
Alan Stern478a8a02010-06-16 14:52:17 -04002464 scsi_autopm_get_device(sdkp->device);
2465
2466 async_synchronize_full();
Hannes Reineckeb3912772009-06-18 09:57:18 +02002467 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
FUJITA Tomonori82b6d572010-07-03 08:07:04 -06002468 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01002469 device_del(&sdkp->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470 del_gendisk(sdkp->disk);
2471 sd_shutdown(dev);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002472
Arjan van de Ven0b950672006-01-11 13:16:10 +01002473 mutex_lock(&sd_ref_mutex);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002474 dev_set_drvdata(dev, NULL);
Tony Jonesee959b02008-02-22 00:13:36 +01002475 put_device(&sdkp->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01002476 mutex_unlock(&sd_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477
2478 return 0;
2479}
2480
2481/**
2482 * scsi_disk_release - Called to free the scsi_disk structure
Tony Jonesee959b02008-02-22 00:13:36 +01002483 * @dev: pointer to embedded class device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484 *
Arjan van de Ven0b950672006-01-11 13:16:10 +01002485 * sd_ref_mutex must be held entering this routine. Because it is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486 * called on last put, you should always use the scsi_disk_get()
2487 * scsi_disk_put() helpers which manipulate the semaphore directly
Tony Jonesee959b02008-02-22 00:13:36 +01002488 * and never do a direct put_device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 **/
Tony Jonesee959b02008-02-22 00:13:36 +01002490static void scsi_disk_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491{
Tony Jonesee959b02008-02-22 00:13:36 +01002492 struct scsi_disk *sdkp = to_scsi_disk(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493 struct gendisk *disk = sdkp->disk;
2494
Tejun Heo4034cc62009-02-21 11:04:45 +09002495 spin_lock(&sd_index_lock);
Tejun Heof27bac22008-07-14 14:59:30 +09002496 ida_remove(&sd_index_ida, sdkp->index);
Tejun Heo4034cc62009-02-21 11:04:45 +09002497 spin_unlock(&sd_index_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498
2499 disk->private_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002500 put_disk(disk);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002501 put_device(&sdkp->device->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002502
2503 kfree(sdkp);
2504}
2505
James Bottomleycc5d2c82007-03-20 12:26:03 -05002506static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
Tejun Heoc3c94c52007-03-21 00:13:59 +09002507{
2508 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2509 struct scsi_sense_hdr sshdr;
James Bottomleycc5d2c82007-03-20 12:26:03 -05002510 struct scsi_device *sdp = sdkp->device;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002511 int res;
2512
2513 if (start)
2514 cmd[4] |= 1; /* START */
2515
Stefan Richterd2886ea2008-05-11 00:34:07 +02002516 if (sdp->start_stop_pwr_cond)
2517 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2518
Tejun Heoc3c94c52007-03-21 00:13:59 +09002519 if (!scsi_device_online(sdp))
2520 return -ENODEV;
2521
2522 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09002523 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002524 if (res) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002525 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2526 sd_print_result(sdkp, res);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002527 if (driver_byte(res) & DRIVER_SENSE)
James Bottomleycc5d2c82007-03-20 12:26:03 -05002528 sd_print_sense_hdr(sdkp, &sshdr);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002529 }
2530
2531 return res;
2532}
2533
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534/*
2535 * Send a SYNCHRONIZE CACHE instruction down to the device through
2536 * the normal SCSI command structure. Wait for the command to
2537 * complete.
2538 */
2539static void sd_shutdown(struct device *dev)
2540{
Alan Stern39b7f1e2005-11-04 14:44:41 -05002541 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542
2543 if (!sdkp)
2544 return; /* this can happen */
2545
Alan Stern39b7f1e2005-11-04 14:44:41 -05002546 if (sdkp->WCE) {
Martin K. Petersene73aec82007-02-27 22:40:55 -05002547 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2548 sd_sync_cache(sdkp);
Alan Stern39b7f1e2005-11-04 14:44:41 -05002549 }
Tejun Heoc3c94c52007-03-21 00:13:59 +09002550
James Bottomleycc5d2c82007-03-20 12:26:03 -05002551 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2552 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2553 sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002554 }
2555
Alan Stern39b7f1e2005-11-04 14:44:41 -05002556 scsi_disk_put(sdkp);
2557}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002558
Tejun Heoc3c94c52007-03-21 00:13:59 +09002559static int sd_suspend(struct device *dev, pm_message_t mesg)
2560{
Tejun Heoc3c94c52007-03-21 00:13:59 +09002561 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04002562 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002563
2564 if (!sdkp)
2565 return 0; /* this can happen */
2566
2567 if (sdkp->WCE) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002568 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
Tejun Heoc3c94c52007-03-21 00:13:59 +09002569 ret = sd_sync_cache(sdkp);
2570 if (ret)
Alan Stern09ff92f2007-05-21 09:55:04 -04002571 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002572 }
2573
Rafael J. Wysocki3a2d5b72008-02-23 19:13:25 +01002574 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
James Bottomleycc5d2c82007-03-20 12:26:03 -05002575 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2576 ret = sd_start_stop_device(sdkp, 0);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002577 }
2578
Alan Stern09ff92f2007-05-21 09:55:04 -04002579done:
2580 scsi_disk_put(sdkp);
2581 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002582}
2583
2584static int sd_resume(struct device *dev)
2585{
Tejun Heoc3c94c52007-03-21 00:13:59 +09002586 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
Alan Stern09ff92f2007-05-21 09:55:04 -04002587 int ret = 0;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002588
James Bottomleycc5d2c82007-03-20 12:26:03 -05002589 if (!sdkp->device->manage_start_stop)
Alan Stern09ff92f2007-05-21 09:55:04 -04002590 goto done;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002591
James Bottomleycc5d2c82007-03-20 12:26:03 -05002592 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
Alan Stern09ff92f2007-05-21 09:55:04 -04002593 ret = sd_start_stop_device(sdkp, 1);
Tejun Heoc3c94c52007-03-21 00:13:59 +09002594
Alan Stern09ff92f2007-05-21 09:55:04 -04002595done:
2596 scsi_disk_put(sdkp);
2597 return ret;
Tejun Heoc3c94c52007-03-21 00:13:59 +09002598}
2599
Linus Torvalds1da177e2005-04-16 15:20:36 -07002600/**
2601 * init_sd - entry point for this driver (both when built in or when
2602 * a module).
2603 *
2604 * Note: this function registers this driver with the scsi mid-level.
2605 **/
2606static int __init init_sd(void)
2607{
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002608 int majors = 0, i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609
2610 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2611
2612 for (i = 0; i < SD_MAJORS; i++)
2613 if (register_blkdev(sd_major(i), "sd") == 0)
2614 majors++;
2615
2616 if (!majors)
2617 return -ENODEV;
2618
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002619 err = class_register(&sd_disk_class);
2620 if (err)
2621 goto err_out;
James Bottomley6bdaa1f2006-03-18 14:14:21 -06002622
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002623 err = scsi_register_driver(&sd_template.gendrv);
2624 if (err)
2625 goto err_out_class;
2626
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002627 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2628 0, 0, NULL);
2629 if (!sd_cdb_cache) {
2630 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2631 goto err_out_class;
2632 }
2633
2634 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2635 if (!sd_cdb_pool) {
2636 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2637 goto err_out_cache;
2638 }
2639
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002640 return 0;
2641
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002642err_out_cache:
2643 kmem_cache_destroy(sd_cdb_cache);
2644
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002645err_out_class:
2646 class_unregister(&sd_disk_class);
2647err_out:
2648 for (i = 0; i < SD_MAJORS; i++)
2649 unregister_blkdev(sd_major(i), "sd");
2650 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651}
2652
2653/**
2654 * exit_sd - exit point for this driver (when it is a module).
2655 *
2656 * Note: this function unregisters this driver from the scsi mid-level.
2657 **/
2658static void __exit exit_sd(void)
2659{
2660 int i;
2661
2662 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2663
Martin K. Petersen4e7392e2009-09-20 16:49:38 -04002664 mempool_destroy(sd_cdb_pool);
2665 kmem_cache_destroy(sd_cdb_cache);
2666
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667 scsi_unregister_driver(&sd_template.gendrv);
Jeff Garzik5e4009b2006-10-04 05:32:54 -04002668 class_unregister(&sd_disk_class);
2669
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670 for (i = 0; i < SD_MAJORS; i++)
2671 unregister_blkdev(sd_major(i), "sd");
2672}
2673
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674module_init(init_sd);
2675module_exit(exit_sd);
Martin K. Petersene73aec82007-02-27 22:40:55 -05002676
2677static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2678 struct scsi_sense_hdr *sshdr)
2679{
David Miller2e4c3322010-08-31 13:35:31 -07002680 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05002681 scsi_show_sense_hdr(sshdr);
David Miller2e4c3322010-08-31 13:35:31 -07002682 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05002683 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2684}
2685
2686static void sd_print_result(struct scsi_disk *sdkp, int result)
2687{
David Miller2e4c3322010-08-31 13:35:31 -07002688 sd_printk(KERN_INFO, sdkp, " ");
Martin K. Petersene73aec82007-02-27 22:40:55 -05002689 scsi_show_result(result);
2690}
2691