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1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
35 | #include <linux/module.h> |
36 | #include <linux/fs.h> | |
37 | #include <linux/kernel.h> | |
1da177e4 LT |
38 | #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> | |
1da177e4 | 48 | #include <linux/delay.h> |
0b950672 | 49 | #include <linux/mutex.h> |
7404ad3b | 50 | #include <linux/string_helpers.h> |
4ace92fc | 51 | #include <linux/async.h> |
5a0e3ad6 | 52 | #include <linux/slab.h> |
54f57588 | 53 | #include <linux/pm_runtime.h> |
1da177e4 | 54 | #include <asm/uaccess.h> |
8f76d151 | 55 | #include <asm/unaligned.h> |
1da177e4 LT |
56 | |
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> | |
1da177e4 LT |
65 | #include <scsi/scsicam.h> |
66 | ||
aa91696e | 67 | #include "sd.h" |
a7a20d10 | 68 | #include "scsi_priv.h" |
1da177e4 LT |
69 | #include "scsi_logging.h" |
70 | ||
f018fa55 RH |
71 | MODULE_AUTHOR("Eric Youngdale"); |
72 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
73 | MODULE_LICENSE("GPL"); | |
74 | ||
75 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
85 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
86 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
87 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
88 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
89 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
90 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
d7b8bcb0 MT |
91 | MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); |
92 | MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); | |
93 | MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); | |
f018fa55 | 94 | |
870d6656 | 95 | #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) |
f615b48c | 96 | #define SD_MINORS 16 |
870d6656 | 97 | #else |
3e1a7ff8 | 98 | #define SD_MINORS 0 |
870d6656 TH |
99 | #endif |
100 | ||
c98a0eb0 | 101 | static void sd_config_discard(struct scsi_disk *, unsigned int); |
7b3d9545 | 102 | static int sd_revalidate_disk(struct gendisk *); |
72ec24bd | 103 | static void sd_unlock_native_capacity(struct gendisk *disk); |
7b3d9545 LT |
104 | static int sd_probe(struct device *); |
105 | static int sd_remove(struct device *); | |
106 | static void sd_shutdown(struct device *); | |
107 | static int sd_suspend(struct device *, pm_message_t state); | |
108 | static int sd_resume(struct device *); | |
109 | static void sd_rescan(struct device *); | |
110 | static int sd_done(struct scsi_cmnd *); | |
18a4d0a2 | 111 | static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int); |
7b3d9545 | 112 | static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); |
ee959b00 | 113 | static void scsi_disk_release(struct device *cdev); |
7b3d9545 LT |
114 | static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); |
115 | static void sd_print_result(struct scsi_disk *, int); | |
116 | ||
4034cc68 | 117 | static DEFINE_SPINLOCK(sd_index_lock); |
f27bac27 | 118 | static DEFINE_IDA(sd_index_ida); |
1da177e4 LT |
119 | |
120 | /* This semaphore is used to mediate the 0->1 reference get in the | |
121 | * face of object destruction (i.e. we can't allow a get on an | |
122 | * object after last put) */ | |
0b950672 | 123 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 | 124 | |
439d77f7 HS |
125 | static struct kmem_cache *sd_cdb_cache; |
126 | static mempool_t *sd_cdb_pool; | |
4e7392ec | 127 | |
6bdaa1f1 JB |
128 | static const char *sd_cache_types[] = { |
129 | "write through", "none", "write back", | |
130 | "write back, no read (daft)" | |
131 | }; | |
132 | ||
ee959b00 TJ |
133 | static ssize_t |
134 | sd_store_cache_type(struct device *dev, struct device_attribute *attr, | |
135 | const char *buf, size_t count) | |
6bdaa1f1 JB |
136 | { |
137 | int i, ct = -1, rcd, wce, sp; | |
ee959b00 | 138 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
139 | struct scsi_device *sdp = sdkp->device; |
140 | char buffer[64]; | |
141 | char *buffer_data; | |
142 | struct scsi_mode_data data; | |
143 | struct scsi_sense_hdr sshdr; | |
144 | int len; | |
145 | ||
146 | if (sdp->type != TYPE_DISK) | |
147 | /* no cache control on RBC devices; theoretically they | |
148 | * can do it, but there's probably so many exceptions | |
149 | * it's not worth the risk */ | |
150 | return -EINVAL; | |
151 | ||
6391a113 | 152 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
439d77f7 | 153 | len = strlen(sd_cache_types[i]); |
6bdaa1f1 JB |
154 | if (strncmp(sd_cache_types[i], buf, len) == 0 && |
155 | buf[len] == '\n') { | |
156 | ct = i; | |
157 | break; | |
158 | } | |
159 | } | |
160 | if (ct < 0) | |
161 | return -EINVAL; | |
162 | rcd = ct & 0x01 ? 1 : 0; | |
163 | wce = ct & 0x02 ? 1 : 0; | |
164 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
165 | SD_MAX_RETRIES, &data, NULL)) | |
166 | return -EINVAL; | |
a9312fb8 | 167 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
168 | data.block_descriptor_length); |
169 | buffer_data = buffer + data.header_length + | |
170 | data.block_descriptor_length; | |
171 | buffer_data[2] &= ~0x05; | |
172 | buffer_data[2] |= wce << 2 | rcd; | |
173 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
174 | ||
175 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
176 | SD_MAX_RETRIES, &data, &sshdr)) { | |
177 | if (scsi_sense_valid(&sshdr)) | |
e73aec82 | 178 | sd_print_sense_hdr(sdkp, &sshdr); |
6bdaa1f1 JB |
179 | return -EINVAL; |
180 | } | |
f98a8cae | 181 | revalidate_disk(sdkp->disk); |
6bdaa1f1 JB |
182 | return count; |
183 | } | |
184 | ||
ee959b00 TJ |
185 | static ssize_t |
186 | sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
187 | const char *buf, size_t count) | |
c3c94c5a | 188 | { |
ee959b00 | 189 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
190 | struct scsi_device *sdp = sdkp->device; |
191 | ||
192 | if (!capable(CAP_SYS_ADMIN)) | |
193 | return -EACCES; | |
194 | ||
195 | sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); | |
196 | ||
197 | return count; | |
198 | } | |
199 | ||
ee959b00 TJ |
200 | static ssize_t |
201 | sd_store_allow_restart(struct device *dev, struct device_attribute *attr, | |
202 | const char *buf, size_t count) | |
a144c5ae | 203 | { |
ee959b00 | 204 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
205 | struct scsi_device *sdp = sdkp->device; |
206 | ||
207 | if (!capable(CAP_SYS_ADMIN)) | |
208 | return -EACCES; | |
209 | ||
210 | if (sdp->type != TYPE_DISK) | |
211 | return -EINVAL; | |
212 | ||
213 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); | |
214 | ||
215 | return count; | |
216 | } | |
217 | ||
ee959b00 TJ |
218 | static ssize_t |
219 | sd_show_cache_type(struct device *dev, struct device_attribute *attr, | |
220 | char *buf) | |
6bdaa1f1 | 221 | { |
ee959b00 | 222 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
223 | int ct = sdkp->RCD + 2*sdkp->WCE; |
224 | ||
225 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
226 | } | |
227 | ||
ee959b00 TJ |
228 | static ssize_t |
229 | sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) | |
6bdaa1f1 | 230 | { |
ee959b00 | 231 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
232 | |
233 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
234 | } | |
235 | ||
ee959b00 TJ |
236 | static ssize_t |
237 | sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
238 | char *buf) | |
c3c94c5a | 239 | { |
ee959b00 | 240 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
241 | struct scsi_device *sdp = sdkp->device; |
242 | ||
243 | return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); | |
244 | } | |
245 | ||
ee959b00 TJ |
246 | static ssize_t |
247 | sd_show_allow_restart(struct device *dev, struct device_attribute *attr, | |
248 | char *buf) | |
a144c5ae | 249 | { |
ee959b00 | 250 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
251 | |
252 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
253 | } | |
254 | ||
e0597d70 MP |
255 | static ssize_t |
256 | sd_show_protection_type(struct device *dev, struct device_attribute *attr, | |
257 | char *buf) | |
258 | { | |
259 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
260 | ||
261 | return snprintf(buf, 20, "%u\n", sdkp->protection_type); | |
262 | } | |
263 | ||
8172499a MP |
264 | static ssize_t |
265 | sd_store_protection_type(struct device *dev, struct device_attribute *attr, | |
266 | const char *buf, size_t count) | |
267 | { | |
268 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
269 | unsigned int val; | |
270 | int err; | |
271 | ||
272 | if (!capable(CAP_SYS_ADMIN)) | |
273 | return -EACCES; | |
274 | ||
275 | err = kstrtouint(buf, 10, &val); | |
276 | ||
277 | if (err) | |
278 | return err; | |
279 | ||
280 | if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION) | |
281 | sdkp->protection_type = val; | |
282 | ||
283 | return count; | |
284 | } | |
285 | ||
518fa8e3 MP |
286 | static ssize_t |
287 | sd_show_protection_mode(struct device *dev, struct device_attribute *attr, | |
288 | char *buf) | |
289 | { | |
290 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
291 | struct scsi_device *sdp = sdkp->device; | |
292 | unsigned int dif, dix; | |
293 | ||
294 | dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); | |
295 | dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type); | |
296 | ||
297 | if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) { | |
298 | dif = 0; | |
299 | dix = 1; | |
300 | } | |
301 | ||
302 | if (!dif && !dix) | |
303 | return snprintf(buf, 20, "none\n"); | |
304 | ||
305 | return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif); | |
306 | } | |
307 | ||
e0597d70 MP |
308 | static ssize_t |
309 | sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, | |
310 | char *buf) | |
311 | { | |
312 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
313 | ||
314 | return snprintf(buf, 20, "%u\n", sdkp->ATO); | |
315 | } | |
316 | ||
e339c1a7 MP |
317 | static ssize_t |
318 | sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, | |
319 | char *buf) | |
320 | { | |
321 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
322 | ||
c98a0eb0 MP |
323 | return snprintf(buf, 20, "%u\n", sdkp->lbpme); |
324 | } | |
325 | ||
326 | static const char *lbp_mode[] = { | |
327 | [SD_LBP_FULL] = "full", | |
328 | [SD_LBP_UNMAP] = "unmap", | |
329 | [SD_LBP_WS16] = "writesame_16", | |
330 | [SD_LBP_WS10] = "writesame_10", | |
331 | [SD_LBP_ZERO] = "writesame_zero", | |
332 | [SD_LBP_DISABLE] = "disabled", | |
333 | }; | |
334 | ||
335 | static ssize_t | |
336 | sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr, | |
337 | char *buf) | |
338 | { | |
339 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
340 | ||
341 | return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]); | |
342 | } | |
343 | ||
344 | static ssize_t | |
345 | sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr, | |
346 | const char *buf, size_t count) | |
347 | { | |
348 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
349 | struct scsi_device *sdp = sdkp->device; | |
350 | ||
351 | if (!capable(CAP_SYS_ADMIN)) | |
352 | return -EACCES; | |
353 | ||
354 | if (sdp->type != TYPE_DISK) | |
355 | return -EINVAL; | |
356 | ||
357 | if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20)) | |
358 | sd_config_discard(sdkp, SD_LBP_UNMAP); | |
359 | else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20)) | |
360 | sd_config_discard(sdkp, SD_LBP_WS16); | |
361 | else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20)) | |
362 | sd_config_discard(sdkp, SD_LBP_WS10); | |
363 | else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20)) | |
364 | sd_config_discard(sdkp, SD_LBP_ZERO); | |
365 | else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20)) | |
366 | sd_config_discard(sdkp, SD_LBP_DISABLE); | |
367 | else | |
368 | return -EINVAL; | |
369 | ||
370 | return count; | |
e339c1a7 MP |
371 | } |
372 | ||
18a4d0a2 MP |
373 | static ssize_t |
374 | sd_show_max_medium_access_timeouts(struct device *dev, | |
375 | struct device_attribute *attr, char *buf) | |
376 | { | |
377 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
378 | ||
379 | return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts); | |
380 | } | |
381 | ||
382 | static ssize_t | |
383 | sd_store_max_medium_access_timeouts(struct device *dev, | |
384 | struct device_attribute *attr, | |
385 | const char *buf, size_t count) | |
386 | { | |
387 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
388 | int err; | |
389 | ||
390 | if (!capable(CAP_SYS_ADMIN)) | |
391 | return -EACCES; | |
392 | ||
393 | err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts); | |
394 | ||
395 | return err ? err : count; | |
396 | } | |
397 | ||
ee959b00 | 398 | static struct device_attribute sd_disk_attrs[] = { |
6bdaa1f1 JB |
399 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, |
400 | sd_store_cache_type), | |
401 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
a144c5ae BK |
402 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
403 | sd_store_allow_restart), | |
c3c94c5a TH |
404 | __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
405 | sd_store_manage_start_stop), | |
8172499a MP |
406 | __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type, |
407 | sd_store_protection_type), | |
518fa8e3 | 408 | __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL), |
e0597d70 | 409 | __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), |
e339c1a7 | 410 | __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), |
c98a0eb0 MP |
411 | __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode, |
412 | sd_store_provisioning_mode), | |
18a4d0a2 MP |
413 | __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR, |
414 | sd_show_max_medium_access_timeouts, | |
415 | sd_store_max_medium_access_timeouts), | |
6bdaa1f1 JB |
416 | __ATTR_NULL, |
417 | }; | |
418 | ||
419 | static struct class sd_disk_class = { | |
420 | .name = "scsi_disk", | |
421 | .owner = THIS_MODULE, | |
ee959b00 TJ |
422 | .dev_release = scsi_disk_release, |
423 | .dev_attrs = sd_disk_attrs, | |
6bdaa1f1 | 424 | }; |
1da177e4 LT |
425 | |
426 | static struct scsi_driver sd_template = { | |
427 | .owner = THIS_MODULE, | |
428 | .gendrv = { | |
429 | .name = "sd", | |
430 | .probe = sd_probe, | |
431 | .remove = sd_remove, | |
c3c94c5a TH |
432 | .suspend = sd_suspend, |
433 | .resume = sd_resume, | |
1da177e4 LT |
434 | .shutdown = sd_shutdown, |
435 | }, | |
436 | .rescan = sd_rescan, | |
7b3d9545 | 437 | .done = sd_done, |
18a4d0a2 | 438 | .eh_action = sd_eh_action, |
1da177e4 LT |
439 | }; |
440 | ||
441 | /* | |
442 | * Device no to disk mapping: | |
443 | * | |
444 | * major disc2 disc p1 | |
445 | * |............|.............|....|....| <- dev_t | |
446 | * 31 20 19 8 7 4 3 0 | |
447 | * | |
448 | * Inside a major, we have 16k disks, however mapped non- | |
449 | * contiguously. The first 16 disks are for major0, the next | |
450 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
451 | * for major1, ... | |
452 | * As we stay compatible with our numbering scheme, we can reuse | |
453 | * the well-know SCSI majors 8, 65--71, 136--143. | |
454 | */ | |
455 | static int sd_major(int major_idx) | |
456 | { | |
457 | switch (major_idx) { | |
458 | case 0: | |
459 | return SCSI_DISK0_MAJOR; | |
460 | case 1 ... 7: | |
461 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
462 | case 8 ... 15: | |
463 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
464 | default: | |
465 | BUG(); | |
466 | return 0; /* shut up gcc */ | |
467 | } | |
468 | } | |
469 | ||
39b7f1e2 | 470 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
471 | { |
472 | struct scsi_disk *sdkp = NULL; | |
473 | ||
39b7f1e2 AS |
474 | if (disk->private_data) { |
475 | sdkp = scsi_disk(disk); | |
476 | if (scsi_device_get(sdkp->device) == 0) | |
ee959b00 | 477 | get_device(&sdkp->dev); |
39b7f1e2 AS |
478 | else |
479 | sdkp = NULL; | |
480 | } | |
481 | return sdkp; | |
482 | } | |
483 | ||
484 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
485 | { | |
486 | struct scsi_disk *sdkp; | |
487 | ||
0b950672 | 488 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 489 | sdkp = __scsi_disk_get(disk); |
0b950672 | 490 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 491 | return sdkp; |
39b7f1e2 | 492 | } |
1da177e4 | 493 | |
39b7f1e2 AS |
494 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
495 | { | |
496 | struct scsi_disk *sdkp; | |
497 | ||
0b950672 | 498 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
499 | sdkp = dev_get_drvdata(dev); |
500 | if (sdkp) | |
501 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 502 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
503 | return sdkp; |
504 | } | |
505 | ||
506 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
507 | { | |
508 | struct scsi_device *sdev = sdkp->device; | |
509 | ||
0b950672 | 510 | mutex_lock(&sd_ref_mutex); |
ee959b00 | 511 | put_device(&sdkp->dev); |
1da177e4 | 512 | scsi_device_put(sdev); |
0b950672 | 513 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
514 | } |
515 | ||
35e1a5d9 MP |
516 | static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) |
517 | { | |
518 | unsigned int prot_op = SCSI_PROT_NORMAL; | |
519 | unsigned int dix = scsi_prot_sg_count(scmd); | |
520 | ||
521 | if (scmd->sc_data_direction == DMA_FROM_DEVICE) { | |
522 | if (dif && dix) | |
523 | prot_op = SCSI_PROT_READ_PASS; | |
524 | else if (dif && !dix) | |
525 | prot_op = SCSI_PROT_READ_STRIP; | |
526 | else if (!dif && dix) | |
527 | prot_op = SCSI_PROT_READ_INSERT; | |
528 | } else { | |
529 | if (dif && dix) | |
530 | prot_op = SCSI_PROT_WRITE_PASS; | |
531 | else if (dif && !dix) | |
532 | prot_op = SCSI_PROT_WRITE_INSERT; | |
533 | else if (!dif && dix) | |
534 | prot_op = SCSI_PROT_WRITE_STRIP; | |
535 | } | |
536 | ||
537 | scsi_set_prot_op(scmd, prot_op); | |
538 | scsi_set_prot_type(scmd, dif); | |
539 | } | |
540 | ||
c98a0eb0 MP |
541 | static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode) |
542 | { | |
543 | struct request_queue *q = sdkp->disk->queue; | |
544 | unsigned int logical_block_size = sdkp->device->sector_size; | |
545 | unsigned int max_blocks = 0; | |
546 | ||
547 | q->limits.discard_zeroes_data = sdkp->lbprz; | |
2a8cfad0 MP |
548 | q->limits.discard_alignment = sdkp->unmap_alignment * |
549 | logical_block_size; | |
c98a0eb0 MP |
550 | q->limits.discard_granularity = |
551 | max(sdkp->physical_block_size, | |
552 | sdkp->unmap_granularity * logical_block_size); | |
553 | ||
89730393 MP |
554 | sdkp->provisioning_mode = mode; |
555 | ||
c98a0eb0 MP |
556 | switch (mode) { |
557 | ||
558 | case SD_LBP_DISABLE: | |
559 | q->limits.max_discard_sectors = 0; | |
560 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); | |
561 | return; | |
562 | ||
563 | case SD_LBP_UNMAP: | |
564 | max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff); | |
565 | break; | |
566 | ||
567 | case SD_LBP_WS16: | |
568 | max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff); | |
569 | break; | |
570 | ||
571 | case SD_LBP_WS10: | |
572 | max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff); | |
573 | break; | |
574 | ||
575 | case SD_LBP_ZERO: | |
576 | max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff); | |
577 | q->limits.discard_zeroes_data = 1; | |
578 | break; | |
579 | } | |
580 | ||
581 | q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9); | |
582 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
c98a0eb0 MP |
583 | } |
584 | ||
e339c1a7 | 585 | /** |
26e85fcd | 586 | * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device |
66ac0280 | 587 | * @sdp: scsi device to operate one |
e339c1a7 MP |
588 | * @rq: Request to prepare |
589 | * | |
590 | * Will issue either UNMAP or WRITE SAME(16) depending on preference | |
591 | * indicated by target device. | |
592 | **/ | |
26e85fcd | 593 | static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) |
e339c1a7 MP |
594 | { |
595 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); | |
26e85fcd MP |
596 | sector_t sector = blk_rq_pos(rq); |
597 | unsigned int nr_sectors = blk_rq_sectors(rq); | |
598 | unsigned int nr_bytes = blk_rq_bytes(rq); | |
66ac0280 | 599 | unsigned int len; |
f1126e95 | 600 | int ret; |
c98a0eb0 | 601 | char *buf; |
66ac0280 | 602 | struct page *page; |
e339c1a7 | 603 | |
26e85fcd MP |
604 | sector >>= ilog2(sdp->sector_size) - 9; |
605 | nr_sectors >>= ilog2(sdp->sector_size) - 9; | |
e339c1a7 MP |
606 | rq->timeout = SD_TIMEOUT; |
607 | ||
608 | memset(rq->cmd, 0, rq->cmd_len); | |
609 | ||
66ac0280 CH |
610 | page = alloc_page(GFP_ATOMIC | __GFP_ZERO); |
611 | if (!page) | |
612 | return BLKPREP_DEFER; | |
613 | ||
c98a0eb0 MP |
614 | switch (sdkp->provisioning_mode) { |
615 | case SD_LBP_UNMAP: | |
616 | buf = page_address(page); | |
e339c1a7 | 617 | |
66ac0280 | 618 | rq->cmd_len = 10; |
e339c1a7 MP |
619 | rq->cmd[0] = UNMAP; |
620 | rq->cmd[8] = 24; | |
e339c1a7 MP |
621 | |
622 | put_unaligned_be16(6 + 16, &buf[0]); | |
623 | put_unaligned_be16(16, &buf[2]); | |
624 | put_unaligned_be64(sector, &buf[8]); | |
66ac0280 | 625 | put_unaligned_be32(nr_sectors, &buf[16]); |
e339c1a7 | 626 | |
66ac0280 | 627 | len = 24; |
c98a0eb0 MP |
628 | break; |
629 | ||
630 | case SD_LBP_WS16: | |
66ac0280 | 631 | rq->cmd_len = 16; |
e339c1a7 MP |
632 | rq->cmd[0] = WRITE_SAME_16; |
633 | rq->cmd[1] = 0x8; /* UNMAP */ | |
634 | put_unaligned_be64(sector, &rq->cmd[2]); | |
66ac0280 CH |
635 | put_unaligned_be32(nr_sectors, &rq->cmd[10]); |
636 | ||
637 | len = sdkp->device->sector_size; | |
c98a0eb0 MP |
638 | break; |
639 | ||
640 | case SD_LBP_WS10: | |
641 | case SD_LBP_ZERO: | |
642 | rq->cmd_len = 10; | |
643 | rq->cmd[0] = WRITE_SAME; | |
644 | if (sdkp->provisioning_mode == SD_LBP_WS10) | |
645 | rq->cmd[1] = 0x8; /* UNMAP */ | |
646 | put_unaligned_be32(sector, &rq->cmd[2]); | |
647 | put_unaligned_be16(nr_sectors, &rq->cmd[7]); | |
648 | ||
649 | len = sdkp->device->sector_size; | |
650 | break; | |
651 | ||
652 | default: | |
09b9cc44 | 653 | ret = BLKPREP_KILL; |
c98a0eb0 | 654 | goto out; |
e339c1a7 MP |
655 | } |
656 | ||
66ac0280 | 657 | blk_add_request_payload(rq, page, len); |
f1126e95 FT |
658 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); |
659 | rq->buffer = page_address(page); | |
26e85fcd | 660 | rq->__data_len = nr_bytes; |
c98a0eb0 MP |
661 | |
662 | out: | |
610a6349 FT |
663 | if (ret != BLKPREP_OK) { |
664 | __free_page(page); | |
665 | rq->buffer = NULL; | |
666 | } | |
f1126e95 FT |
667 | return ret; |
668 | } | |
669 | ||
90467c29 FT |
670 | static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) |
671 | { | |
e3b3e624 | 672 | rq->timeout = SD_FLUSH_TIMEOUT; |
90467c29 FT |
673 | rq->retries = SD_MAX_RETRIES; |
674 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
675 | rq->cmd_len = 10; | |
676 | ||
677 | return scsi_setup_blk_pc_cmnd(sdp, rq); | |
678 | } | |
679 | ||
f1126e95 FT |
680 | static void sd_unprep_fn(struct request_queue *q, struct request *rq) |
681 | { | |
610a6349 FT |
682 | if (rq->cmd_flags & REQ_DISCARD) { |
683 | free_page((unsigned long)rq->buffer); | |
684 | rq->buffer = NULL; | |
685 | } | |
e339c1a7 MP |
686 | } |
687 | ||
1da177e4 | 688 | /** |
2db93ce8 | 689 | * sd_prep_fn - build a scsi (read or write) command from |
1da177e4 LT |
690 | * information in the request structure. |
691 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
692 | * contains request and into which the scsi command is written | |
693 | * | |
694 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
695 | **/ | |
7f9a6bc4 | 696 | static int sd_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 697 | { |
7f9a6bc4 JB |
698 | struct scsi_cmnd *SCpnt; |
699 | struct scsi_device *sdp = q->queuedata; | |
776b23a0 | 700 | struct gendisk *disk = rq->rq_disk; |
af55ff67 | 701 | struct scsi_disk *sdkp; |
83096ebf | 702 | sector_t block = blk_rq_pos(rq); |
18351070 | 703 | sector_t threshold; |
83096ebf | 704 | unsigned int this_count = blk_rq_sectors(rq); |
bd623e79 | 705 | int ret, host_dif; |
4e7392ec | 706 | unsigned char protect; |
7f9a6bc4 | 707 | |
e339c1a7 MP |
708 | /* |
709 | * Discard request come in as REQ_TYPE_FS but we turn them into | |
710 | * block PC requests to make life easier. | |
711 | */ | |
66ac0280 | 712 | if (rq->cmd_flags & REQ_DISCARD) { |
26e85fcd | 713 | ret = sd_setup_discard_cmnd(sdp, rq); |
66ac0280 | 714 | goto out; |
90467c29 FT |
715 | } else if (rq->cmd_flags & REQ_FLUSH) { |
716 | ret = scsi_setup_flush_cmnd(sdp, rq); | |
717 | goto out; | |
66ac0280 | 718 | } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { |
7f9a6bc4 JB |
719 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); |
720 | goto out; | |
721 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
722 | ret = BLKPREP_KILL; | |
723 | goto out; | |
724 | } | |
725 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
726 | if (ret != BLKPREP_OK) | |
727 | goto out; | |
728 | SCpnt = rq->special; | |
af55ff67 | 729 | sdkp = scsi_disk(disk); |
7f9a6bc4 JB |
730 | |
731 | /* from here on until we're complete, any goto out | |
732 | * is used for a killable error condition */ | |
733 | ret = BLKPREP_KILL; | |
1da177e4 | 734 | |
fa0d34be | 735 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
2db93ce8 | 736 | "sd_prep_fn: block=%llu, " |
fa0d34be MP |
737 | "count=%d\n", |
738 | (unsigned long long)block, | |
739 | this_count)); | |
1da177e4 LT |
740 | |
741 | if (!sdp || !scsi_device_online(sdp) || | |
83096ebf | 742 | block + blk_rq_sectors(rq) > get_capacity(disk)) { |
fa0d34be | 743 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
83096ebf TH |
744 | "Finishing %u sectors\n", |
745 | blk_rq_sectors(rq))); | |
fa0d34be MP |
746 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
747 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 748 | goto out; |
1da177e4 LT |
749 | } |
750 | ||
751 | if (sdp->changed) { | |
752 | /* | |
753 | * quietly refuse to do anything to a changed disc until | |
754 | * the changed bit has been reset | |
755 | */ | |
3ff5588d | 756 | /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */ |
7f9a6bc4 | 757 | goto out; |
1da177e4 | 758 | } |
7f9a6bc4 | 759 | |
a0899d4d | 760 | /* |
18351070 LT |
761 | * Some SD card readers can't handle multi-sector accesses which touch |
762 | * the last one or two hardware sectors. Split accesses as needed. | |
a0899d4d | 763 | */ |
18351070 LT |
764 | threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * |
765 | (sdp->sector_size / 512); | |
766 | ||
767 | if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { | |
768 | if (block < threshold) { | |
769 | /* Access up to the threshold but not beyond */ | |
770 | this_count = threshold - block; | |
771 | } else { | |
772 | /* Access only a single hardware sector */ | |
773 | this_count = sdp->sector_size / 512; | |
774 | } | |
775 | } | |
a0899d4d | 776 | |
fa0d34be MP |
777 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
778 | (unsigned long long)block)); | |
1da177e4 LT |
779 | |
780 | /* | |
781 | * If we have a 1K hardware sectorsize, prevent access to single | |
782 | * 512 byte sectors. In theory we could handle this - in fact | |
783 | * the scsi cdrom driver must be able to handle this because | |
784 | * we typically use 1K blocksizes, and cdroms typically have | |
785 | * 2K hardware sectorsizes. Of course, things are simpler | |
786 | * with the cdrom, since it is read-only. For performance | |
787 | * reasons, the filesystems should be able to handle this | |
788 | * and not force the scsi disk driver to use bounce buffers | |
789 | * for this. | |
790 | */ | |
791 | if (sdp->sector_size == 1024) { | |
83096ebf | 792 | if ((block & 1) || (blk_rq_sectors(rq) & 1)) { |
e73aec82 MP |
793 | scmd_printk(KERN_ERR, SCpnt, |
794 | "Bad block number requested\n"); | |
7f9a6bc4 | 795 | goto out; |
1da177e4 LT |
796 | } else { |
797 | block = block >> 1; | |
798 | this_count = this_count >> 1; | |
799 | } | |
800 | } | |
801 | if (sdp->sector_size == 2048) { | |
83096ebf | 802 | if ((block & 3) || (blk_rq_sectors(rq) & 3)) { |
e73aec82 MP |
803 | scmd_printk(KERN_ERR, SCpnt, |
804 | "Bad block number requested\n"); | |
7f9a6bc4 | 805 | goto out; |
1da177e4 LT |
806 | } else { |
807 | block = block >> 2; | |
808 | this_count = this_count >> 2; | |
809 | } | |
810 | } | |
811 | if (sdp->sector_size == 4096) { | |
83096ebf | 812 | if ((block & 7) || (blk_rq_sectors(rq) & 7)) { |
e73aec82 MP |
813 | scmd_printk(KERN_ERR, SCpnt, |
814 | "Bad block number requested\n"); | |
7f9a6bc4 | 815 | goto out; |
1da177e4 LT |
816 | } else { |
817 | block = block >> 3; | |
818 | this_count = this_count >> 3; | |
819 | } | |
820 | } | |
821 | if (rq_data_dir(rq) == WRITE) { | |
822 | if (!sdp->writeable) { | |
7f9a6bc4 | 823 | goto out; |
1da177e4 LT |
824 | } |
825 | SCpnt->cmnd[0] = WRITE_6; | |
826 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
af55ff67 | 827 | |
8c579ab6 MP |
828 | if (blk_integrity_rq(rq)) |
829 | sd_dif_prepare(rq, block, sdp->sector_size); | |
af55ff67 | 830 | |
1da177e4 LT |
831 | } else if (rq_data_dir(rq) == READ) { |
832 | SCpnt->cmnd[0] = READ_6; | |
833 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
834 | } else { | |
e73aec82 | 835 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
7f9a6bc4 | 836 | goto out; |
1da177e4 LT |
837 | } |
838 | ||
fa0d34be | 839 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
83096ebf | 840 | "%s %d/%u 512 byte blocks.\n", |
fa0d34be MP |
841 | (rq_data_dir(rq) == WRITE) ? |
842 | "writing" : "reading", this_count, | |
83096ebf | 843 | blk_rq_sectors(rq))); |
1da177e4 | 844 | |
af55ff67 | 845 | /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ |
bd623e79 MP |
846 | host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); |
847 | if (host_dif) | |
4e7392ec | 848 | protect = 1 << 5; |
af55ff67 | 849 | else |
4e7392ec MP |
850 | protect = 0; |
851 | ||
852 | if (host_dif == SD_DIF_TYPE2_PROTECTION) { | |
853 | SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); | |
854 | ||
855 | if (unlikely(SCpnt->cmnd == NULL)) { | |
856 | ret = BLKPREP_DEFER; | |
857 | goto out; | |
858 | } | |
af55ff67 | 859 | |
4e7392ec MP |
860 | SCpnt->cmd_len = SD_EXT_CDB_SIZE; |
861 | memset(SCpnt->cmnd, 0, SCpnt->cmd_len); | |
862 | SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; | |
863 | SCpnt->cmnd[7] = 0x18; | |
864 | SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; | |
33659ebb | 865 | SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); |
4e7392ec MP |
866 | |
867 | /* LBA */ | |
868 | SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; | |
869 | SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
870 | SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
871 | SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
872 | SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; | |
873 | SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; | |
874 | SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; | |
875 | SCpnt->cmnd[19] = (unsigned char) block & 0xff; | |
876 | ||
877 | /* Expected Indirect LBA */ | |
878 | SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; | |
879 | SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; | |
880 | SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; | |
881 | SCpnt->cmnd[23] = (unsigned char) block & 0xff; | |
882 | ||
883 | /* Transfer length */ | |
884 | SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; | |
885 | SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; | |
886 | SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; | |
887 | SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; | |
888 | } else if (block > 0xffffffff) { | |
1da177e4 | 889 | SCpnt->cmnd[0] += READ_16 - READ_6; |
33659ebb | 890 | SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); |
1da177e4 LT |
891 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
892 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
893 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
894 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
895 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
896 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
897 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
898 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
899 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
900 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
901 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
902 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
903 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
904 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
af55ff67 | 905 | scsi_device_protection(SCpnt->device) || |
1da177e4 LT |
906 | SCpnt->device->use_10_for_rw) { |
907 | if (this_count > 0xffff) | |
908 | this_count = 0xffff; | |
909 | ||
910 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
33659ebb | 911 | SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0); |
1da177e4 LT |
912 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
913 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
914 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
915 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
916 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
917 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
918 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
919 | } else { | |
33659ebb | 920 | if (unlikely(rq->cmd_flags & REQ_FUA)) { |
007365ad TH |
921 | /* |
922 | * This happens only if this drive failed | |
923 | * 10byte rw command with ILLEGAL_REQUEST | |
924 | * during operation and thus turned off | |
925 | * use_10_for_rw. | |
926 | */ | |
e73aec82 MP |
927 | scmd_printk(KERN_ERR, SCpnt, |
928 | "FUA write on READ/WRITE(6) drive\n"); | |
7f9a6bc4 | 929 | goto out; |
007365ad TH |
930 | } |
931 | ||
1da177e4 LT |
932 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
933 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
934 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
935 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
936 | SCpnt->cmnd[5] = 0; | |
937 | } | |
30b0c37b | 938 | SCpnt->sdb.length = this_count * sdp->sector_size; |
1da177e4 | 939 | |
af55ff67 | 940 | /* If DIF or DIX is enabled, tell HBA how to handle request */ |
bd623e79 | 941 | if (host_dif || scsi_prot_sg_count(SCpnt)) |
35e1a5d9 | 942 | sd_prot_op(SCpnt, host_dif); |
af55ff67 | 943 | |
1da177e4 LT |
944 | /* |
945 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
946 | * host adapter, it's safe to assume that we can at least transfer | |
947 | * this many bytes between each connect / disconnect. | |
948 | */ | |
949 | SCpnt->transfersize = sdp->sector_size; | |
950 | SCpnt->underflow = this_count << 9; | |
951 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 | 952 | |
1da177e4 LT |
953 | /* |
954 | * This indicates that the command is ready from our end to be | |
955 | * queued. | |
956 | */ | |
7f9a6bc4 JB |
957 | ret = BLKPREP_OK; |
958 | out: | |
959 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
960 | } |
961 | ||
962 | /** | |
963 | * sd_open - open a scsi disk device | |
964 | * @inode: only i_rdev member may be used | |
965 | * @filp: only f_mode and f_flags may be used | |
966 | * | |
967 | * Returns 0 if successful. Returns a negated errno value in case | |
968 | * of error. | |
969 | * | |
970 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
971 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
972 | * In the latter case @inode and @filp carry an abridged amount | |
973 | * of information as noted above. | |
409f3499 AB |
974 | * |
975 | * Locking: called with bdev->bd_mutex held. | |
1da177e4 | 976 | **/ |
0338e291 | 977 | static int sd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 978 | { |
0338e291 | 979 | struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); |
1da177e4 LT |
980 | struct scsi_device *sdev; |
981 | int retval; | |
982 | ||
0338e291 | 983 | if (!sdkp) |
1da177e4 LT |
984 | return -ENXIO; |
985 | ||
fa0d34be | 986 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1da177e4 LT |
987 | |
988 | sdev = sdkp->device; | |
989 | ||
478a8a05 AS |
990 | retval = scsi_autopm_get_device(sdev); |
991 | if (retval) | |
992 | goto error_autopm; | |
993 | ||
1da177e4 LT |
994 | /* |
995 | * If the device is in error recovery, wait until it is done. | |
996 | * If the device is offline, then disallow any access to it. | |
997 | */ | |
998 | retval = -ENXIO; | |
999 | if (!scsi_block_when_processing_errors(sdev)) | |
1000 | goto error_out; | |
1001 | ||
1002 | if (sdev->removable || sdkp->write_prot) | |
0338e291 | 1003 | check_disk_change(bdev); |
1da177e4 LT |
1004 | |
1005 | /* | |
1006 | * If the drive is empty, just let the open fail. | |
1007 | */ | |
1008 | retval = -ENOMEDIUM; | |
0338e291 | 1009 | if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) |
1da177e4 LT |
1010 | goto error_out; |
1011 | ||
1012 | /* | |
1013 | * If the device has the write protect tab set, have the open fail | |
1014 | * if the user expects to be able to write to the thing. | |
1015 | */ | |
1016 | retval = -EROFS; | |
0338e291 | 1017 | if (sdkp->write_prot && (mode & FMODE_WRITE)) |
1da177e4 LT |
1018 | goto error_out; |
1019 | ||
1020 | /* | |
1021 | * It is possible that the disk changing stuff resulted in | |
1022 | * the device being taken offline. If this is the case, | |
1023 | * report this to the user, and don't pretend that the | |
1024 | * open actually succeeded. | |
1025 | */ | |
1026 | retval = -ENXIO; | |
1027 | if (!scsi_device_online(sdev)) | |
1028 | goto error_out; | |
1029 | ||
409f3499 | 1030 | if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) { |
1da177e4 LT |
1031 | if (scsi_block_when_processing_errors(sdev)) |
1032 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
1033 | } | |
1034 | ||
1035 | return 0; | |
1036 | ||
1037 | error_out: | |
478a8a05 AS |
1038 | scsi_autopm_put_device(sdev); |
1039 | error_autopm: | |
1da177e4 LT |
1040 | scsi_disk_put(sdkp); |
1041 | return retval; | |
1042 | } | |
1043 | ||
1044 | /** | |
1045 | * sd_release - invoked when the (last) close(2) is called on this | |
1046 | * scsi disk. | |
1047 | * @inode: only i_rdev member may be used | |
1048 | * @filp: only f_mode and f_flags may be used | |
1049 | * | |
1050 | * Returns 0. | |
1051 | * | |
1052 | * Note: may block (uninterruptible) if error recovery is underway | |
1053 | * on this disk. | |
409f3499 AB |
1054 | * |
1055 | * Locking: called with bdev->bd_mutex held. | |
1da177e4 | 1056 | **/ |
0338e291 | 1057 | static int sd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 1058 | { |
1da177e4 LT |
1059 | struct scsi_disk *sdkp = scsi_disk(disk); |
1060 | struct scsi_device *sdev = sdkp->device; | |
1061 | ||
56937f7b | 1062 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); |
1da177e4 | 1063 | |
7e443312 | 1064 | if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) { |
1da177e4 LT |
1065 | if (scsi_block_when_processing_errors(sdev)) |
1066 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * XXX and what if there are packets in flight and this close() | |
1071 | * XXX is followed by a "rmmod sd_mod"? | |
1072 | */ | |
478a8a05 AS |
1073 | |
1074 | scsi_autopm_put_device(sdev); | |
1da177e4 LT |
1075 | scsi_disk_put(sdkp); |
1076 | return 0; | |
1077 | } | |
1078 | ||
a885c8c4 | 1079 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
1080 | { |
1081 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
1082 | struct scsi_device *sdp = sdkp->device; | |
1083 | struct Scsi_Host *host = sdp->host; | |
1084 | int diskinfo[4]; | |
1085 | ||
1086 | /* default to most commonly used values */ | |
1087 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
1088 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
1089 | diskinfo[2] = sdkp->capacity >> 11; | |
1090 | ||
1091 | /* override with calculated, extended default, or driver values */ | |
1092 | if (host->hostt->bios_param) | |
1093 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
1094 | else | |
1095 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
1096 | ||
a885c8c4 CH |
1097 | geo->heads = diskinfo[0]; |
1098 | geo->sectors = diskinfo[1]; | |
1099 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
1100 | return 0; |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * sd_ioctl - process an ioctl | |
1105 | * @inode: only i_rdev/i_bdev members may be used | |
1106 | * @filp: only f_mode and f_flags may be used | |
1107 | * @cmd: ioctl command number | |
1108 | * @arg: this is third argument given to ioctl(2) system call. | |
1109 | * Often contains a pointer. | |
1110 | * | |
25985edc | 1111 | * Returns 0 if successful (some ioctls return positive numbers on |
1da177e4 LT |
1112 | * success as well). Returns a negated errno value in case of error. |
1113 | * | |
1114 | * Note: most ioctls are forward onto the block subsystem or further | |
3a4fa0a2 | 1115 | * down in the scsi subsystem. |
1da177e4 | 1116 | **/ |
0338e291 | 1117 | static int sd_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
1118 | unsigned int cmd, unsigned long arg) |
1119 | { | |
1da177e4 | 1120 | struct gendisk *disk = bdev->bd_disk; |
fe2d1851 NN |
1121 | struct scsi_disk *sdkp = scsi_disk(disk); |
1122 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 LT |
1123 | void __user *p = (void __user *)arg; |
1124 | int error; | |
1125 | ||
fe2d1851 NN |
1126 | SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " |
1127 | "cmd=0x%x\n", disk->disk_name, cmd)); | |
1da177e4 | 1128 | |
0bfc96cb PB |
1129 | error = scsi_verify_blk_ioctl(bdev, cmd); |
1130 | if (error < 0) | |
1131 | return error; | |
1132 | ||
1da177e4 LT |
1133 | /* |
1134 | * If we are in the middle of error recovery, don't let anyone | |
1135 | * else try and use this device. Also, if error recovery fails, it | |
1136 | * may try and take the device offline, in which case all further | |
1137 | * access to the device is prohibited. | |
1138 | */ | |
83ff6fe8 | 1139 | error = scsi_nonblockable_ioctl(sdp, cmd, p, |
fd4ce1ac | 1140 | (mode & FMODE_NDELAY) != 0); |
1da177e4 | 1141 | if (!scsi_block_when_processing_errors(sdp) || !error) |
8a6cfeb6 | 1142 | goto out; |
1da177e4 | 1143 | |
1da177e4 LT |
1144 | /* |
1145 | * Send SCSI addressing ioctls directly to mid level, send other | |
1146 | * ioctls to block level and then onto mid level if they can't be | |
1147 | * resolved. | |
1148 | */ | |
1149 | switch (cmd) { | |
1150 | case SCSI_IOCTL_GET_IDLUN: | |
1151 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 AB |
1152 | error = scsi_ioctl(sdp, cmd, p); |
1153 | break; | |
1da177e4 | 1154 | default: |
577ebb37 | 1155 | error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); |
1da177e4 | 1156 | if (error != -ENOTTY) |
8a6cfeb6 AB |
1157 | break; |
1158 | error = scsi_ioctl(sdp, cmd, p); | |
1159 | break; | |
1da177e4 | 1160 | } |
8a6cfeb6 | 1161 | out: |
8a6cfeb6 | 1162 | return error; |
1da177e4 LT |
1163 | } |
1164 | ||
1165 | static void set_media_not_present(struct scsi_disk *sdkp) | |
1166 | { | |
2bae0093 TH |
1167 | if (sdkp->media_present) |
1168 | sdkp->device->changed = 1; | |
1169 | ||
1170 | if (sdkp->device->removable) { | |
1171 | sdkp->media_present = 0; | |
1172 | sdkp->capacity = 0; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | static int media_not_present(struct scsi_disk *sdkp, | |
1177 | struct scsi_sense_hdr *sshdr) | |
1178 | { | |
1179 | if (!scsi_sense_valid(sshdr)) | |
1180 | return 0; | |
1181 | ||
1182 | /* not invoked for commands that could return deferred errors */ | |
1183 | switch (sshdr->sense_key) { | |
1184 | case UNIT_ATTENTION: | |
1185 | case NOT_READY: | |
1186 | /* medium not present */ | |
1187 | if (sshdr->asc == 0x3A) { | |
1188 | set_media_not_present(sdkp); | |
1189 | return 1; | |
1190 | } | |
1191 | } | |
1192 | return 0; | |
1da177e4 LT |
1193 | } |
1194 | ||
1195 | /** | |
2bae0093 TH |
1196 | * sd_check_events - check media events |
1197 | * @disk: kernel device descriptor | |
1198 | * @clearing: disk events currently being cleared | |
1da177e4 | 1199 | * |
2bae0093 | 1200 | * Returns mask of DISK_EVENT_*. |
1da177e4 LT |
1201 | * |
1202 | * Note: this function is invoked from the block subsystem. | |
1203 | **/ | |
2bae0093 | 1204 | static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) |
1da177e4 LT |
1205 | { |
1206 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1207 | struct scsi_device *sdp = sdkp->device; | |
001aac25 | 1208 | struct scsi_sense_hdr *sshdr = NULL; |
1da177e4 LT |
1209 | int retval; |
1210 | ||
2bae0093 | 1211 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n")); |
1da177e4 LT |
1212 | |
1213 | /* | |
1214 | * If the device is offline, don't send any commands - just pretend as | |
1215 | * if the command failed. If the device ever comes back online, we | |
1216 | * can deal with it then. It is only because of unrecoverable errors | |
1217 | * that we would ever take a device offline in the first place. | |
1218 | */ | |
285e9670 KS |
1219 | if (!scsi_device_online(sdp)) { |
1220 | set_media_not_present(sdkp); | |
285e9670 KS |
1221 | goto out; |
1222 | } | |
1da177e4 LT |
1223 | |
1224 | /* | |
1225 | * Using TEST_UNIT_READY enables differentiation between drive with | |
1226 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
1227 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
1228 | * | |
1229 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
1230 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
1231 | * sd_revalidate() is called. | |
1232 | */ | |
1233 | retval = -ENODEV; | |
285e9670 | 1234 | |
001aac25 | 1235 | if (scsi_block_when_processing_errors(sdp)) { |
4e2247b2 LT |
1236 | retval = scsi_autopm_get_device(sdp); |
1237 | if (retval) | |
1238 | goto out; | |
1239 | ||
001aac25 JB |
1240 | sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); |
1241 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, | |
1242 | sshdr); | |
4e2247b2 | 1243 | scsi_autopm_put_device(sdp); |
001aac25 | 1244 | } |
1da177e4 | 1245 | |
2bae0093 TH |
1246 | /* failed to execute TUR, assume media not present */ |
1247 | if (host_byte(retval)) { | |
285e9670 | 1248 | set_media_not_present(sdkp); |
285e9670 KS |
1249 | goto out; |
1250 | } | |
1da177e4 | 1251 | |
2bae0093 TH |
1252 | if (media_not_present(sdkp, sshdr)) |
1253 | goto out; | |
1254 | ||
1da177e4 LT |
1255 | /* |
1256 | * For removable scsi disk we have to recognise the presence | |
2bae0093 | 1257 | * of a disk in the drive. |
1da177e4 | 1258 | */ |
2bae0093 TH |
1259 | if (!sdkp->media_present) |
1260 | sdp->changed = 1; | |
1da177e4 | 1261 | sdkp->media_present = 1; |
285e9670 | 1262 | out: |
3ff5588d | 1263 | /* |
2bae0093 | 1264 | * sdp->changed is set under the following conditions: |
3ff5588d | 1265 | * |
2bae0093 TH |
1266 | * Medium present state has changed in either direction. |
1267 | * Device has indicated UNIT_ATTENTION. | |
3ff5588d | 1268 | */ |
001aac25 | 1269 | kfree(sshdr); |
2bae0093 TH |
1270 | retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0; |
1271 | sdp->changed = 0; | |
1da177e4 | 1272 | return retval; |
1da177e4 LT |
1273 | } |
1274 | ||
e73aec82 | 1275 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1da177e4 | 1276 | { |
1da177e4 | 1277 | int retries, res; |
e73aec82 | 1278 | struct scsi_device *sdp = sdkp->device; |
ea73a9f2 | 1279 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
1280 | |
1281 | if (!scsi_device_online(sdp)) | |
1282 | return -ENODEV; | |
1283 | ||
1da177e4 | 1284 | |
1da177e4 LT |
1285 | for (retries = 3; retries > 0; --retries) { |
1286 | unsigned char cmd[10] = { 0 }; | |
1287 | ||
1288 | cmd[0] = SYNCHRONIZE_CACHE; | |
1289 | /* | |
1290 | * Leave the rest of the command zero to indicate | |
1291 | * flush everything. | |
1292 | */ | |
ea73a9f2 | 1293 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
e3b3e624 | 1294 | SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL); |
ea73a9f2 | 1295 | if (res == 0) |
1da177e4 LT |
1296 | break; |
1297 | } | |
1298 | ||
e73aec82 MP |
1299 | if (res) { |
1300 | sd_print_result(sdkp, res); | |
1301 | if (driver_byte(res) & DRIVER_SENSE) | |
1302 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1303 | } |
1304 | ||
3721050a TH |
1305 | if (res) |
1306 | return -EIO; | |
1307 | return 0; | |
1da177e4 LT |
1308 | } |
1309 | ||
1da177e4 LT |
1310 | static void sd_rescan(struct device *dev) |
1311 | { | |
39b7f1e2 AS |
1312 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1313 | ||
1314 | if (sdkp) { | |
f98a8cae | 1315 | revalidate_disk(sdkp->disk); |
39b7f1e2 AS |
1316 | scsi_disk_put(sdkp); |
1317 | } | |
1da177e4 LT |
1318 | } |
1319 | ||
1320 | ||
1321 | #ifdef CONFIG_COMPAT | |
1322 | /* | |
1323 | * This gets directly called from VFS. When the ioctl | |
1324 | * is not recognized we go back to the other translation paths. | |
1325 | */ | |
0338e291 AV |
1326 | static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
1327 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1328 | { |
0338e291 | 1329 | struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; |
0bfc96cb PB |
1330 | int ret; |
1331 | ||
1332 | ret = scsi_verify_blk_ioctl(bdev, cmd); | |
1333 | if (ret < 0) | |
1334 | return ret; | |
1da177e4 LT |
1335 | |
1336 | /* | |
1337 | * If we are in the middle of error recovery, don't let anyone | |
1338 | * else try and use this device. Also, if error recovery fails, it | |
1339 | * may try and take the device offline, in which case all further | |
1340 | * access to the device is prohibited. | |
1341 | */ | |
1342 | if (!scsi_block_when_processing_errors(sdev)) | |
1343 | return -ENODEV; | |
1344 | ||
1345 | if (sdev->host->hostt->compat_ioctl) { | |
1da177e4 LT |
1346 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); |
1347 | ||
1348 | return ret; | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Let the static ioctl translation table take care of it. | |
1353 | */ | |
1354 | return -ENOIOCTLCMD; | |
1355 | } | |
1356 | #endif | |
1357 | ||
83d5cde4 | 1358 | static const struct block_device_operations sd_fops = { |
1da177e4 | 1359 | .owner = THIS_MODULE, |
0338e291 AV |
1360 | .open = sd_open, |
1361 | .release = sd_release, | |
8a6cfeb6 | 1362 | .ioctl = sd_ioctl, |
a885c8c4 | 1363 | .getgeo = sd_getgeo, |
1da177e4 | 1364 | #ifdef CONFIG_COMPAT |
0338e291 | 1365 | .compat_ioctl = sd_compat_ioctl, |
1da177e4 | 1366 | #endif |
2bae0093 | 1367 | .check_events = sd_check_events, |
1da177e4 | 1368 | .revalidate_disk = sd_revalidate_disk, |
72ec24bd | 1369 | .unlock_native_capacity = sd_unlock_native_capacity, |
1da177e4 LT |
1370 | }; |
1371 | ||
18a4d0a2 MP |
1372 | /** |
1373 | * sd_eh_action - error handling callback | |
1374 | * @scmd: sd-issued command that has failed | |
1375 | * @eh_cmnd: The command that was sent during error handling | |
1376 | * @eh_cmnd_len: Length of eh_cmnd in bytes | |
1377 | * @eh_disp: The recovery disposition suggested by the midlayer | |
1378 | * | |
1379 | * This function is called by the SCSI midlayer upon completion of | |
1380 | * an error handling command (TEST UNIT READY, START STOP UNIT, | |
1381 | * etc.) The command sent to the device by the error handler is | |
1382 | * stored in eh_cmnd. The result of sending the eh command is | |
1383 | * passed in eh_disp. | |
1384 | **/ | |
1385 | static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd, | |
1386 | int eh_cmnd_len, int eh_disp) | |
1387 | { | |
1388 | struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk); | |
1389 | ||
1390 | if (!scsi_device_online(scmd->device) || | |
1391 | !scsi_medium_access_command(scmd)) | |
1392 | return eh_disp; | |
1393 | ||
1394 | /* | |
1395 | * The device has timed out executing a medium access command. | |
1396 | * However, the TEST UNIT READY command sent during error | |
1397 | * handling completed successfully. Either the device is in the | |
1398 | * process of recovering or has it suffered an internal failure | |
1399 | * that prevents access to the storage medium. | |
1400 | */ | |
1401 | if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS && | |
1402 | eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY) | |
1403 | sdkp->medium_access_timed_out++; | |
1404 | ||
1405 | /* | |
1406 | * If the device keeps failing read/write commands but TEST UNIT | |
1407 | * READY always completes successfully we assume that medium | |
1408 | * access is no longer possible and take the device offline. | |
1409 | */ | |
1410 | if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) { | |
1411 | scmd_printk(KERN_ERR, scmd, | |
1412 | "Medium access timeout failure. Offlining disk!\n"); | |
1413 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); | |
1414 | ||
1415 | return FAILED; | |
1416 | } | |
1417 | ||
1418 | return eh_disp; | |
1419 | } | |
1420 | ||
af55ff67 MP |
1421 | static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) |
1422 | { | |
83096ebf TH |
1423 | u64 start_lba = blk_rq_pos(scmd->request); |
1424 | u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); | |
af55ff67 MP |
1425 | u64 bad_lba; |
1426 | int info_valid; | |
a8733c7b JB |
1427 | /* |
1428 | * resid is optional but mostly filled in. When it's unused, | |
1429 | * its value is zero, so we assume the whole buffer transferred | |
1430 | */ | |
1431 | unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd); | |
1432 | unsigned int good_bytes; | |
af55ff67 | 1433 | |
33659ebb | 1434 | if (scmd->request->cmd_type != REQ_TYPE_FS) |
af55ff67 MP |
1435 | return 0; |
1436 | ||
1437 | info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, | |
1438 | SCSI_SENSE_BUFFERSIZE, | |
1439 | &bad_lba); | |
1440 | if (!info_valid) | |
1441 | return 0; | |
1442 | ||
1443 | if (scsi_bufflen(scmd) <= scmd->device->sector_size) | |
1444 | return 0; | |
1445 | ||
1446 | if (scmd->device->sector_size < 512) { | |
1447 | /* only legitimate sector_size here is 256 */ | |
1448 | start_lba <<= 1; | |
1449 | end_lba <<= 1; | |
1450 | } else { | |
1451 | /* be careful ... don't want any overflows */ | |
1452 | u64 factor = scmd->device->sector_size / 512; | |
1453 | do_div(start_lba, factor); | |
1454 | do_div(end_lba, factor); | |
1455 | } | |
1456 | ||
1457 | /* The bad lba was reported incorrectly, we have no idea where | |
1458 | * the error is. | |
1459 | */ | |
1460 | if (bad_lba < start_lba || bad_lba >= end_lba) | |
1461 | return 0; | |
1462 | ||
1463 | /* This computation should always be done in terms of | |
1464 | * the resolution of the device's medium. | |
1465 | */ | |
a8733c7b JB |
1466 | good_bytes = (bad_lba - start_lba) * scmd->device->sector_size; |
1467 | return min(good_bytes, transferred); | |
af55ff67 MP |
1468 | } |
1469 | ||
1da177e4 | 1470 | /** |
7b3d9545 | 1471 | * sd_done - bottom half handler: called when the lower level |
1da177e4 LT |
1472 | * driver has completed (successfully or otherwise) a scsi command. |
1473 | * @SCpnt: mid-level's per command structure. | |
1474 | * | |
1475 | * Note: potentially run from within an ISR. Must not block. | |
1476 | **/ | |
7b3d9545 | 1477 | static int sd_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
1478 | { |
1479 | int result = SCpnt->result; | |
af55ff67 | 1480 | unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); |
1da177e4 | 1481 | struct scsi_sense_hdr sshdr; |
4e7392ec | 1482 | struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); |
26e85fcd | 1483 | struct request *req = SCpnt->request; |
1da177e4 LT |
1484 | int sense_valid = 0; |
1485 | int sense_deferred = 0; | |
c98a0eb0 | 1486 | unsigned char op = SCpnt->cmnd[0]; |
1da177e4 | 1487 | |
26e85fcd MP |
1488 | if (req->cmd_flags & REQ_DISCARD) { |
1489 | if (!result) { | |
1490 | good_bytes = blk_rq_bytes(req); | |
1491 | scsi_set_resid(SCpnt, 0); | |
1492 | } else { | |
1493 | good_bytes = 0; | |
1494 | scsi_set_resid(SCpnt, blk_rq_bytes(req)); | |
1495 | } | |
1496 | } | |
6a32a8ae | 1497 | |
1da177e4 LT |
1498 | if (result) { |
1499 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
1500 | if (sense_valid) | |
1501 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
1502 | } | |
1da177e4 | 1503 | #ifdef CONFIG_SCSI_LOGGING |
fa0d34be | 1504 | SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
1da177e4 | 1505 | if (sense_valid) { |
fa0d34be | 1506 | SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
7b3d9545 | 1507 | "sd_done: sb[respc,sk,asc," |
fa0d34be MP |
1508 | "ascq]=%x,%x,%x,%x\n", |
1509 | sshdr.response_code, | |
1510 | sshdr.sense_key, sshdr.asc, | |
1511 | sshdr.ascq)); | |
1da177e4 LT |
1512 | } |
1513 | #endif | |
03aba2f7 LT |
1514 | if (driver_byte(result) != DRIVER_SENSE && |
1515 | (!sense_valid || sense_deferred)) | |
1516 | goto out; | |
1517 | ||
18a4d0a2 MP |
1518 | sdkp->medium_access_timed_out = 0; |
1519 | ||
03aba2f7 LT |
1520 | switch (sshdr.sense_key) { |
1521 | case HARDWARE_ERROR: | |
1522 | case MEDIUM_ERROR: | |
af55ff67 | 1523 | good_bytes = sd_completed_bytes(SCpnt); |
03aba2f7 LT |
1524 | break; |
1525 | case RECOVERED_ERROR: | |
af55ff67 MP |
1526 | good_bytes = scsi_bufflen(SCpnt); |
1527 | break; | |
10dab226 JW |
1528 | case NO_SENSE: |
1529 | /* This indicates a false check condition, so ignore it. An | |
1530 | * unknown amount of data was transferred so treat it as an | |
1531 | * error. | |
1532 | */ | |
1533 | scsi_print_sense("sd", SCpnt); | |
1534 | SCpnt->result = 0; | |
1535 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
1536 | break; | |
c98a0eb0 MP |
1537 | case ABORTED_COMMAND: |
1538 | if (sshdr.asc == 0x10) /* DIF: Target detected corruption */ | |
1539 | good_bytes = sd_completed_bytes(SCpnt); | |
1540 | break; | |
1541 | case ILLEGAL_REQUEST: | |
1542 | if (sshdr.asc == 0x10) /* DIX: Host detected corruption */ | |
af55ff67 | 1543 | good_bytes = sd_completed_bytes(SCpnt); |
c98a0eb0 MP |
1544 | /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */ |
1545 | if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) && | |
1546 | (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME)) | |
1547 | sd_config_discard(sdkp, SD_LBP_DISABLE); | |
03aba2f7 LT |
1548 | break; |
1549 | default: | |
1550 | break; | |
1da177e4 | 1551 | } |
03aba2f7 | 1552 | out: |
af55ff67 MP |
1553 | if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) |
1554 | sd_dif_complete(SCpnt, good_bytes); | |
1555 | ||
4e7392ec | 1556 | if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) |
77c9cfc5 MP |
1557 | == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { |
1558 | ||
1559 | /* We have to print a failed command here as the | |
1560 | * extended CDB gets freed before scsi_io_completion() | |
1561 | * is called. | |
1562 | */ | |
1563 | if (result) | |
1564 | scsi_print_command(SCpnt); | |
1565 | ||
4e7392ec | 1566 | mempool_free(SCpnt->cmnd, sd_cdb_pool); |
77c9cfc5 MP |
1567 | SCpnt->cmnd = NULL; |
1568 | SCpnt->cmd_len = 0; | |
1569 | } | |
4e7392ec | 1570 | |
7b3d9545 | 1571 | return good_bytes; |
1da177e4 LT |
1572 | } |
1573 | ||
1da177e4 LT |
1574 | /* |
1575 | * spinup disk - called only in sd_revalidate_disk() | |
1576 | */ | |
1577 | static void | |
e73aec82 | 1578 | sd_spinup_disk(struct scsi_disk *sdkp) |
ea73a9f2 | 1579 | { |
1da177e4 | 1580 | unsigned char cmd[10]; |
4451e472 | 1581 | unsigned long spintime_expire = 0; |
1da177e4 LT |
1582 | int retries, spintime; |
1583 | unsigned int the_result; | |
1584 | struct scsi_sense_hdr sshdr; | |
1585 | int sense_valid = 0; | |
1586 | ||
1587 | spintime = 0; | |
1588 | ||
1589 | /* Spin up drives, as required. Only do this at boot time */ | |
1590 | /* Spinup needs to be done for module loads too. */ | |
1591 | do { | |
1592 | retries = 0; | |
1593 | ||
1594 | do { | |
1595 | cmd[0] = TEST_UNIT_READY; | |
1596 | memset((void *) &cmd[1], 0, 9); | |
1597 | ||
ea73a9f2 JB |
1598 | the_result = scsi_execute_req(sdkp->device, cmd, |
1599 | DMA_NONE, NULL, 0, | |
1600 | &sshdr, SD_TIMEOUT, | |
f4f4e47e | 1601 | SD_MAX_RETRIES, NULL); |
1da177e4 | 1602 | |
b4d38e38 AS |
1603 | /* |
1604 | * If the drive has indicated to us that it | |
1605 | * doesn't have any media in it, don't bother | |
1606 | * with any more polling. | |
1607 | */ | |
1608 | if (media_not_present(sdkp, &sshdr)) | |
1609 | return; | |
1610 | ||
1da177e4 | 1611 | if (the_result) |
ea73a9f2 | 1612 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1613 | retries++; |
1614 | } while (retries < 3 && | |
1615 | (!scsi_status_is_good(the_result) || | |
1616 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1617 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1618 | ||
1da177e4 LT |
1619 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1620 | /* no sense, TUR either succeeded or failed | |
1621 | * with a status error */ | |
e73aec82 MP |
1622 | if(!spintime && !scsi_status_is_good(the_result)) { |
1623 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); | |
1624 | sd_print_result(sdkp, the_result); | |
1625 | } | |
1da177e4 LT |
1626 | break; |
1627 | } | |
1628 | ||
1629 | /* | |
1630 | * The device does not want the automatic start to be issued. | |
1631 | */ | |
33dd6f92 | 1632 | if (sdkp->device->no_start_on_add) |
1da177e4 | 1633 | break; |
1da177e4 | 1634 | |
33dd6f92 MW |
1635 | if (sense_valid && sshdr.sense_key == NOT_READY) { |
1636 | if (sshdr.asc == 4 && sshdr.ascq == 3) | |
1637 | break; /* manual intervention required */ | |
1638 | if (sshdr.asc == 4 && sshdr.ascq == 0xb) | |
1639 | break; /* standby */ | |
1640 | if (sshdr.asc == 4 && sshdr.ascq == 0xc) | |
1641 | break; /* unavailable */ | |
1642 | /* | |
1643 | * Issue command to spin up drive when not ready | |
1644 | */ | |
1da177e4 | 1645 | if (!spintime) { |
e73aec82 | 1646 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1da177e4 LT |
1647 | cmd[0] = START_STOP; |
1648 | cmd[1] = 1; /* Return immediately */ | |
1649 | memset((void *) &cmd[2], 0, 8); | |
1650 | cmd[4] = 1; /* Start spin cycle */ | |
d2886ea3 SR |
1651 | if (sdkp->device->start_stop_pwr_cond) |
1652 | cmd[4] |= 1 << 4; | |
ea73a9f2 JB |
1653 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1654 | NULL, 0, &sshdr, | |
f4f4e47e FT |
1655 | SD_TIMEOUT, SD_MAX_RETRIES, |
1656 | NULL); | |
4451e472 AS |
1657 | spintime_expire = jiffies + 100 * HZ; |
1658 | spintime = 1; | |
1da177e4 | 1659 | } |
1da177e4 LT |
1660 | /* Wait 1 second for next try */ |
1661 | msleep(1000); | |
1662 | printk("."); | |
4451e472 AS |
1663 | |
1664 | /* | |
1665 | * Wait for USB flash devices with slow firmware. | |
1666 | * Yes, this sense key/ASC combination shouldn't | |
1667 | * occur here. It's characteristic of these devices. | |
1668 | */ | |
1669 | } else if (sense_valid && | |
1670 | sshdr.sense_key == UNIT_ATTENTION && | |
1671 | sshdr.asc == 0x28) { | |
1672 | if (!spintime) { | |
1673 | spintime_expire = jiffies + 5 * HZ; | |
1674 | spintime = 1; | |
1675 | } | |
1676 | /* Wait 1 second for next try */ | |
1677 | msleep(1000); | |
1da177e4 LT |
1678 | } else { |
1679 | /* we don't understand the sense code, so it's | |
1680 | * probably pointless to loop */ | |
1681 | if(!spintime) { | |
e73aec82 MP |
1682 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1683 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1684 | } |
1685 | break; | |
1686 | } | |
1687 | ||
4451e472 | 1688 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1689 | |
1690 | if (spintime) { | |
1691 | if (scsi_status_is_good(the_result)) | |
1692 | printk("ready\n"); | |
1693 | else | |
1694 | printk("not responding...\n"); | |
1695 | } | |
1696 | } | |
1697 | ||
e0597d70 MP |
1698 | |
1699 | /* | |
1700 | * Determine whether disk supports Data Integrity Field. | |
1701 | */ | |
fe542396 | 1702 | static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) |
e0597d70 MP |
1703 | { |
1704 | struct scsi_device *sdp = sdkp->device; | |
1705 | u8 type; | |
fe542396 | 1706 | int ret = 0; |
e0597d70 MP |
1707 | |
1708 | if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) | |
fe542396 | 1709 | return ret; |
35e1a5d9 MP |
1710 | |
1711 | type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ | |
1712 | ||
fe542396 MP |
1713 | if (type > SD_DIF_TYPE3_PROTECTION) |
1714 | ret = -ENODEV; | |
1715 | else if (scsi_host_dif_capable(sdp->host, type)) | |
1716 | ret = 1; | |
1717 | ||
1718 | if (sdkp->first_scan || type != sdkp->protection_type) | |
1719 | switch (ret) { | |
1720 | case -ENODEV: | |
1721 | sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \ | |
1722 | " protection type %u. Disabling disk!\n", | |
1723 | type); | |
1724 | break; | |
1725 | case 1: | |
1726 | sd_printk(KERN_NOTICE, sdkp, | |
1727 | "Enabling DIF Type %u protection\n", type); | |
1728 | break; | |
1729 | case 0: | |
1730 | sd_printk(KERN_NOTICE, sdkp, | |
1731 | "Disabling DIF Type %u protection\n", type); | |
1732 | break; | |
1733 | } | |
e0597d70 | 1734 | |
be922f47 MP |
1735 | sdkp->protection_type = type; |
1736 | ||
fe542396 | 1737 | return ret; |
e0597d70 MP |
1738 | } |
1739 | ||
0da205e0 MW |
1740 | static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, |
1741 | struct scsi_sense_hdr *sshdr, int sense_valid, | |
1742 | int the_result) | |
1743 | { | |
1744 | sd_print_result(sdkp, the_result); | |
1745 | if (driver_byte(the_result) & DRIVER_SENSE) | |
1746 | sd_print_sense_hdr(sdkp, sshdr); | |
1747 | else | |
1748 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); | |
1749 | ||
1750 | /* | |
1751 | * Set dirty bit for removable devices if not ready - | |
1752 | * sometimes drives will not report this properly. | |
1753 | */ | |
1754 | if (sdp->removable && | |
1755 | sense_valid && sshdr->sense_key == NOT_READY) | |
2bae0093 | 1756 | set_media_not_present(sdkp); |
0da205e0 MW |
1757 | |
1758 | /* | |
1759 | * We used to set media_present to 0 here to indicate no media | |
1760 | * in the drive, but some drives fail read capacity even with | |
1761 | * media present, so we can't do that. | |
1762 | */ | |
1763 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ | |
1764 | } | |
1765 | ||
1766 | #define RC16_LEN 32 | |
1767 | #if RC16_LEN > SD_BUF_SIZE | |
1768 | #error RC16_LEN must not be more than SD_BUF_SIZE | |
1769 | #endif | |
1770 | ||
3233ac19 JB |
1771 | #define READ_CAPACITY_RETRIES_ON_RESET 10 |
1772 | ||
0da205e0 MW |
1773 | static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, |
1774 | unsigned char *buffer) | |
ea73a9f2 | 1775 | { |
1da177e4 | 1776 | unsigned char cmd[16]; |
1da177e4 LT |
1777 | struct scsi_sense_hdr sshdr; |
1778 | int sense_valid = 0; | |
0da205e0 | 1779 | int the_result; |
3233ac19 | 1780 | int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; |
ea09bcc9 | 1781 | unsigned int alignment; |
0da205e0 MW |
1782 | unsigned long long lba; |
1783 | unsigned sector_size; | |
1da177e4 | 1784 | |
5ce524bd HG |
1785 | if (sdp->no_read_capacity_16) |
1786 | return -EINVAL; | |
1787 | ||
1da177e4 | 1788 | do { |
0da205e0 MW |
1789 | memset(cmd, 0, 16); |
1790 | cmd[0] = SERVICE_ACTION_IN; | |
1791 | cmd[1] = SAI_READ_CAPACITY_16; | |
1792 | cmd[13] = RC16_LEN; | |
1793 | memset(buffer, 0, RC16_LEN); | |
1794 | ||
ea73a9f2 | 1795 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
0da205e0 MW |
1796 | buffer, RC16_LEN, &sshdr, |
1797 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); | |
1da177e4 | 1798 | |
ea73a9f2 | 1799 | if (media_not_present(sdkp, &sshdr)) |
0da205e0 | 1800 | return -ENODEV; |
1da177e4 | 1801 | |
2b301307 | 1802 | if (the_result) { |
ea73a9f2 | 1803 | sense_valid = scsi_sense_valid(&sshdr); |
2b301307 MW |
1804 | if (sense_valid && |
1805 | sshdr.sense_key == ILLEGAL_REQUEST && | |
1806 | (sshdr.asc == 0x20 || sshdr.asc == 0x24) && | |
1807 | sshdr.ascq == 0x00) | |
1808 | /* Invalid Command Operation Code or | |
1809 | * Invalid Field in CDB, just retry | |
1810 | * silently with RC10 */ | |
1811 | return -EINVAL; | |
3233ac19 JB |
1812 | if (sense_valid && |
1813 | sshdr.sense_key == UNIT_ATTENTION && | |
1814 | sshdr.asc == 0x29 && sshdr.ascq == 0x00) | |
1815 | /* Device reset might occur several times, | |
1816 | * give it one more chance */ | |
1817 | if (--reset_retries > 0) | |
1818 | continue; | |
2b301307 | 1819 | } |
1da177e4 LT |
1820 | retries--; |
1821 | ||
1822 | } while (the_result && retries); | |
1823 | ||
0da205e0 | 1824 | if (the_result) { |
e73aec82 | 1825 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
0da205e0 MW |
1826 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); |
1827 | return -EINVAL; | |
1828 | } | |
e73aec82 | 1829 | |
8f76d151 DH |
1830 | sector_size = get_unaligned_be32(&buffer[8]); |
1831 | lba = get_unaligned_be64(&buffer[0]); | |
0da205e0 | 1832 | |
fe542396 MP |
1833 | if (sd_read_protection_type(sdkp, buffer) < 0) { |
1834 | sdkp->capacity = 0; | |
1835 | return -ENODEV; | |
1836 | } | |
0da205e0 MW |
1837 | |
1838 | if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { | |
1839 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " | |
1840 | "kernel compiled with support for large block " | |
1841 | "devices.\n"); | |
1842 | sdkp->capacity = 0; | |
1843 | return -EOVERFLOW; | |
1844 | } | |
1845 | ||
ea09bcc9 | 1846 | /* Logical blocks per physical block exponent */ |
526f7c79 | 1847 | sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size; |
ea09bcc9 MP |
1848 | |
1849 | /* Lowest aligned logical block */ | |
1850 | alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; | |
1851 | blk_queue_alignment_offset(sdp->request_queue, alignment); | |
1852 | if (alignment && sdkp->first_scan) | |
1853 | sd_printk(KERN_NOTICE, sdkp, | |
1854 | "physical block alignment offset: %u\n", alignment); | |
1855 | ||
c98a0eb0 MP |
1856 | if (buffer[14] & 0x80) { /* LBPME */ |
1857 | sdkp->lbpme = 1; | |
e339c1a7 | 1858 | |
c98a0eb0 MP |
1859 | if (buffer[14] & 0x40) /* LBPRZ */ |
1860 | sdkp->lbprz = 1; | |
e339c1a7 | 1861 | |
c98a0eb0 | 1862 | sd_config_discard(sdkp, SD_LBP_WS16); |
e339c1a7 MP |
1863 | } |
1864 | ||
0da205e0 MW |
1865 | sdkp->capacity = lba + 1; |
1866 | return sector_size; | |
1867 | } | |
1868 | ||
1869 | static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, | |
1870 | unsigned char *buffer) | |
1871 | { | |
1872 | unsigned char cmd[16]; | |
1873 | struct scsi_sense_hdr sshdr; | |
1874 | int sense_valid = 0; | |
1875 | int the_result; | |
3233ac19 | 1876 | int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; |
0da205e0 MW |
1877 | sector_t lba; |
1878 | unsigned sector_size; | |
1879 | ||
1880 | do { | |
1881 | cmd[0] = READ_CAPACITY; | |
1882 | memset(&cmd[1], 0, 9); | |
1883 | memset(buffer, 0, 8); | |
1884 | ||
1885 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, | |
1886 | buffer, 8, &sshdr, | |
1887 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); | |
1888 | ||
1889 | if (media_not_present(sdkp, &sshdr)) | |
1890 | return -ENODEV; | |
1891 | ||
3233ac19 | 1892 | if (the_result) { |
0da205e0 | 1893 | sense_valid = scsi_sense_valid(&sshdr); |
3233ac19 JB |
1894 | if (sense_valid && |
1895 | sshdr.sense_key == UNIT_ATTENTION && | |
1896 | sshdr.asc == 0x29 && sshdr.ascq == 0x00) | |
1897 | /* Device reset might occur several times, | |
1898 | * give it one more chance */ | |
1899 | if (--reset_retries > 0) | |
1900 | continue; | |
1901 | } | |
0da205e0 MW |
1902 | retries--; |
1903 | ||
1904 | } while (the_result && retries); | |
1905 | ||
1906 | if (the_result) { | |
1907 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); | |
1908 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); | |
1909 | return -EINVAL; | |
1910 | } | |
1911 | ||
8f76d151 DH |
1912 | sector_size = get_unaligned_be32(&buffer[4]); |
1913 | lba = get_unaligned_be32(&buffer[0]); | |
0da205e0 | 1914 | |
5ce524bd HG |
1915 | if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { |
1916 | /* Some buggy (usb cardreader) devices return an lba of | |
1917 | 0xffffffff when the want to report a size of 0 (with | |
1918 | which they really mean no media is present) */ | |
1919 | sdkp->capacity = 0; | |
5cc10350 | 1920 | sdkp->physical_block_size = sector_size; |
5ce524bd HG |
1921 | return sector_size; |
1922 | } | |
1923 | ||
0da205e0 MW |
1924 | if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { |
1925 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " | |
1926 | "kernel compiled with support for large block " | |
1927 | "devices.\n"); | |
1928 | sdkp->capacity = 0; | |
1929 | return -EOVERFLOW; | |
1930 | } | |
1931 | ||
1932 | sdkp->capacity = lba + 1; | |
526f7c79 | 1933 | sdkp->physical_block_size = sector_size; |
0da205e0 MW |
1934 | return sector_size; |
1935 | } | |
1936 | ||
2b301307 MW |
1937 | static int sd_try_rc16_first(struct scsi_device *sdp) |
1938 | { | |
f87146bb HR |
1939 | if (sdp->host->max_cmd_len < 16) |
1940 | return 0; | |
6a0bdffa AS |
1941 | if (sdp->try_rc_10_first) |
1942 | return 0; | |
2b301307 MW |
1943 | if (sdp->scsi_level > SCSI_SPC_2) |
1944 | return 1; | |
1945 | if (scsi_device_protection(sdp)) | |
1946 | return 1; | |
1947 | return 0; | |
1948 | } | |
1949 | ||
0da205e0 MW |
1950 | /* |
1951 | * read disk capacity | |
1952 | */ | |
1953 | static void | |
1954 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) | |
1955 | { | |
1956 | int sector_size; | |
1957 | struct scsi_device *sdp = sdkp->device; | |
70a9b873 | 1958 | sector_t old_capacity = sdkp->capacity; |
0da205e0 | 1959 | |
2b301307 | 1960 | if (sd_try_rc16_first(sdp)) { |
0da205e0 MW |
1961 | sector_size = read_capacity_16(sdkp, sdp, buffer); |
1962 | if (sector_size == -EOVERFLOW) | |
1da177e4 | 1963 | goto got_data; |
2b301307 MW |
1964 | if (sector_size == -ENODEV) |
1965 | return; | |
1966 | if (sector_size < 0) | |
1967 | sector_size = read_capacity_10(sdkp, sdp, buffer); | |
0da205e0 MW |
1968 | if (sector_size < 0) |
1969 | return; | |
1da177e4 | 1970 | } else { |
0da205e0 MW |
1971 | sector_size = read_capacity_10(sdkp, sdp, buffer); |
1972 | if (sector_size == -EOVERFLOW) | |
1973 | goto got_data; | |
1974 | if (sector_size < 0) | |
1975 | return; | |
1976 | if ((sizeof(sdkp->capacity) > 4) && | |
1977 | (sdkp->capacity > 0xffffffffULL)) { | |
1978 | int old_sector_size = sector_size; | |
1979 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " | |
1980 | "Trying to use READ CAPACITY(16).\n"); | |
1981 | sector_size = read_capacity_16(sdkp, sdp, buffer); | |
1982 | if (sector_size < 0) { | |
1983 | sd_printk(KERN_NOTICE, sdkp, | |
1984 | "Using 0xffffffff as device size\n"); | |
1985 | sdkp->capacity = 1 + (sector_t) 0xffffffff; | |
1986 | sector_size = old_sector_size; | |
1987 | goto got_data; | |
1988 | } | |
1989 | } | |
1990 | } | |
1da177e4 | 1991 | |
5c211caa AS |
1992 | /* Some devices are known to return the total number of blocks, |
1993 | * not the highest block number. Some devices have versions | |
1994 | * which do this and others which do not. Some devices we might | |
1995 | * suspect of doing this but we don't know for certain. | |
1996 | * | |
1997 | * If we know the reported capacity is wrong, decrement it. If | |
1998 | * we can only guess, then assume the number of blocks is even | |
1999 | * (usually true but not always) and err on the side of lowering | |
2000 | * the capacity. | |
2001 | */ | |
2002 | if (sdp->fix_capacity || | |
2003 | (sdp->guess_capacity && (sdkp->capacity & 0x01))) { | |
2004 | sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " | |
2005 | "from its reported value: %llu\n", | |
2006 | (unsigned long long) sdkp->capacity); | |
1da177e4 | 2007 | --sdkp->capacity; |
61bf54b7 ON |
2008 | } |
2009 | ||
1da177e4 LT |
2010 | got_data: |
2011 | if (sector_size == 0) { | |
2012 | sector_size = 512; | |
e73aec82 MP |
2013 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
2014 | "assuming 512.\n"); | |
1da177e4 LT |
2015 | } |
2016 | ||
2017 | if (sector_size != 512 && | |
2018 | sector_size != 1024 && | |
2019 | sector_size != 2048 && | |
2020 | sector_size != 4096 && | |
2021 | sector_size != 256) { | |
e73aec82 MP |
2022 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
2023 | sector_size); | |
1da177e4 LT |
2024 | /* |
2025 | * The user might want to re-format the drive with | |
2026 | * a supported sectorsize. Once this happens, it | |
2027 | * would be relatively trivial to set the thing up. | |
2028 | * For this reason, we leave the thing in the table. | |
2029 | */ | |
2030 | sdkp->capacity = 0; | |
2031 | /* | |
2032 | * set a bogus sector size so the normal read/write | |
2033 | * logic in the block layer will eventually refuse any | |
2034 | * request on this device without tripping over power | |
2035 | * of two sector size assumptions | |
2036 | */ | |
2037 | sector_size = 512; | |
2038 | } | |
e1defc4f | 2039 | blk_queue_logical_block_size(sdp->request_queue, sector_size); |
7404ad3b | 2040 | |
1da177e4 | 2041 | { |
7404ad3b | 2042 | char cap_str_2[10], cap_str_10[10]; |
520a2c27 | 2043 | u64 sz = (u64)sdkp->capacity << ilog2(sector_size); |
1da177e4 | 2044 | |
7404ad3b JB |
2045 | string_get_size(sz, STRING_UNITS_2, cap_str_2, |
2046 | sizeof(cap_str_2)); | |
2047 | string_get_size(sz, STRING_UNITS_10, cap_str_10, | |
2048 | sizeof(cap_str_10)); | |
1da177e4 | 2049 | |
ea09bcc9 | 2050 | if (sdkp->first_scan || old_capacity != sdkp->capacity) { |
70a9b873 | 2051 | sd_printk(KERN_NOTICE, sdkp, |
ea09bcc9 | 2052 | "%llu %d-byte logical blocks: (%s/%s)\n", |
70a9b873 MP |
2053 | (unsigned long long)sdkp->capacity, |
2054 | sector_size, cap_str_10, cap_str_2); | |
ea09bcc9 | 2055 | |
526f7c79 | 2056 | if (sdkp->physical_block_size != sector_size) |
ea09bcc9 MP |
2057 | sd_printk(KERN_NOTICE, sdkp, |
2058 | "%u-byte physical blocks\n", | |
526f7c79 | 2059 | sdkp->physical_block_size); |
ea09bcc9 | 2060 | } |
1da177e4 LT |
2061 | } |
2062 | ||
2063 | /* Rescale capacity to 512-byte units */ | |
2064 | if (sector_size == 4096) | |
2065 | sdkp->capacity <<= 3; | |
2066 | else if (sector_size == 2048) | |
2067 | sdkp->capacity <<= 2; | |
2068 | else if (sector_size == 1024) | |
2069 | sdkp->capacity <<= 1; | |
2070 | else if (sector_size == 256) | |
2071 | sdkp->capacity >>= 1; | |
2072 | ||
526f7c79 MP |
2073 | blk_queue_physical_block_size(sdp->request_queue, |
2074 | sdkp->physical_block_size); | |
1da177e4 LT |
2075 | sdkp->device->sector_size = sector_size; |
2076 | } | |
2077 | ||
2078 | /* called with buffer of length 512 */ | |
2079 | static inline int | |
ea73a9f2 JB |
2080 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
2081 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
2082 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 2083 | { |
ea73a9f2 | 2084 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 2085 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 2086 | sshdr); |
1da177e4 LT |
2087 | } |
2088 | ||
2089 | /* | |
2090 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 2091 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
2092 | */ |
2093 | static void | |
e73aec82 | 2094 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 2095 | { |
1da177e4 | 2096 | int res; |
ea73a9f2 | 2097 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 2098 | struct scsi_mode_data data; |
70a9b873 | 2099 | int old_wp = sdkp->write_prot; |
1da177e4 LT |
2100 | |
2101 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 2102 | if (sdp->skip_ms_page_3f) { |
e73aec82 | 2103 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
1da177e4 LT |
2104 | return; |
2105 | } | |
2106 | ||
ea73a9f2 JB |
2107 | if (sdp->use_192_bytes_for_3f) { |
2108 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
2109 | } else { |
2110 | /* | |
2111 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
2112 | * We have to start carefully: some devices hang if we ask | |
2113 | * for more than is available. | |
2114 | */ | |
ea73a9f2 | 2115 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
2116 | |
2117 | /* | |
2118 | * Second attempt: ask for page 0 When only page 0 is | |
2119 | * implemented, a request for page 3F may return Sense Key | |
2120 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
2121 | * CDB. | |
2122 | */ | |
2123 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 2124 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
2125 | |
2126 | /* | |
2127 | * Third attempt: ask 255 bytes, as we did earlier. | |
2128 | */ | |
2129 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
2130 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
2131 | &data, NULL); | |
1da177e4 LT |
2132 | } |
2133 | ||
2134 | if (!scsi_status_is_good(res)) { | |
e73aec82 MP |
2135 | sd_printk(KERN_WARNING, sdkp, |
2136 | "Test WP failed, assume Write Enabled\n"); | |
1da177e4 LT |
2137 | } else { |
2138 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
2139 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
70a9b873 MP |
2140 | if (sdkp->first_scan || old_wp != sdkp->write_prot) { |
2141 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", | |
2142 | sdkp->write_prot ? "on" : "off"); | |
2143 | sd_printk(KERN_DEBUG, sdkp, | |
2144 | "Mode Sense: %02x %02x %02x %02x\n", | |
2145 | buffer[0], buffer[1], buffer[2], buffer[3]); | |
2146 | } | |
1da177e4 LT |
2147 | } |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 2152 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
2153 | */ |
2154 | static void | |
e73aec82 | 2155 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
631e8a13 | 2156 | { |
1da177e4 | 2157 | int len = 0, res; |
ea73a9f2 | 2158 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 2159 | |
631e8a13 AV |
2160 | int dbd; |
2161 | int modepage; | |
0bcaa111 | 2162 | int first_len; |
1da177e4 LT |
2163 | struct scsi_mode_data data; |
2164 | struct scsi_sense_hdr sshdr; | |
70a9b873 MP |
2165 | int old_wce = sdkp->WCE; |
2166 | int old_rcd = sdkp->RCD; | |
2167 | int old_dpofua = sdkp->DPOFUA; | |
1da177e4 | 2168 | |
0bcaa111 LT |
2169 | first_len = 4; |
2170 | if (sdp->skip_ms_page_8) { | |
2171 | if (sdp->type == TYPE_RBC) | |
2172 | goto defaults; | |
2173 | else { | |
2174 | if (sdp->skip_ms_page_3f) | |
2175 | goto defaults; | |
2176 | modepage = 0x3F; | |
2177 | if (sdp->use_192_bytes_for_3f) | |
2178 | first_len = 192; | |
2179 | dbd = 0; | |
2180 | } | |
2181 | } else if (sdp->type == TYPE_RBC) { | |
631e8a13 AV |
2182 | modepage = 6; |
2183 | dbd = 8; | |
2184 | } else { | |
2185 | modepage = 8; | |
2186 | dbd = 0; | |
2187 | } | |
2188 | ||
1da177e4 | 2189 | /* cautiously ask */ |
0bcaa111 LT |
2190 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len, |
2191 | &data, &sshdr); | |
1da177e4 LT |
2192 | |
2193 | if (!scsi_status_is_good(res)) | |
2194 | goto bad_sense; | |
2195 | ||
6d73c851 AV |
2196 | if (!data.header_length) { |
2197 | modepage = 6; | |
0bcaa111 | 2198 | first_len = 0; |
e73aec82 | 2199 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
6d73c851 AV |
2200 | } |
2201 | ||
1da177e4 LT |
2202 | /* that went OK, now ask for the proper length */ |
2203 | len = data.length; | |
2204 | ||
2205 | /* | |
2206 | * We're only interested in the first three bytes, actually. | |
2207 | * But the data cache page is defined for the first 20. | |
2208 | */ | |
2209 | if (len < 3) | |
2210 | goto bad_sense; | |
0bcaa111 LT |
2211 | else if (len > SD_BUF_SIZE) { |
2212 | sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter " | |
2213 | "data from %d to %d bytes\n", len, SD_BUF_SIZE); | |
2214 | len = SD_BUF_SIZE; | |
2215 | } | |
2216 | if (modepage == 0x3F && sdp->use_192_bytes_for_3f) | |
2217 | len = 192; | |
1da177e4 LT |
2218 | |
2219 | /* Get the data */ | |
0bcaa111 LT |
2220 | if (len > first_len) |
2221 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, | |
2222 | &data, &sshdr); | |
1da177e4 LT |
2223 | |
2224 | if (scsi_status_is_good(res)) { | |
631e8a13 | 2225 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 2226 | |
0bcaa111 LT |
2227 | while (offset < len) { |
2228 | u8 page_code = buffer[offset] & 0x3F; | |
2229 | u8 spf = buffer[offset] & 0x40; | |
2230 | ||
2231 | if (page_code == 8 || page_code == 6) { | |
2232 | /* We're interested only in the first 3 bytes. | |
2233 | */ | |
2234 | if (len - offset <= 2) { | |
2235 | sd_printk(KERN_ERR, sdkp, "Incomplete " | |
2236 | "mode parameter data\n"); | |
2237 | goto defaults; | |
2238 | } else { | |
2239 | modepage = page_code; | |
2240 | goto Page_found; | |
2241 | } | |
2242 | } else { | |
2243 | /* Go to the next page */ | |
2244 | if (spf && len - offset > 3) | |
2245 | offset += 4 + (buffer[offset+2] << 8) + | |
2246 | buffer[offset+3]; | |
2247 | else if (!spf && len - offset > 1) | |
2248 | offset += 2 + buffer[offset+1]; | |
2249 | else { | |
2250 | sd_printk(KERN_ERR, sdkp, "Incomplete " | |
2251 | "mode parameter data\n"); | |
2252 | goto defaults; | |
2253 | } | |
2254 | } | |
48970800 AV |
2255 | } |
2256 | ||
0bcaa111 LT |
2257 | if (modepage == 0x3F) { |
2258 | sd_printk(KERN_ERR, sdkp, "No Caching mode page " | |
2259 | "present\n"); | |
2260 | goto defaults; | |
2261 | } else if ((buffer[offset] & 0x3f) != modepage) { | |
e73aec82 | 2262 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
631e8a13 AV |
2263 | goto defaults; |
2264 | } | |
0bcaa111 | 2265 | Page_found: |
631e8a13 AV |
2266 | if (modepage == 8) { |
2267 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
2268 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
2269 | } else { | |
2270 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
2271 | sdkp->RCD = 0; | |
2272 | } | |
1da177e4 | 2273 | |
007365ad TH |
2274 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
2275 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
e73aec82 MP |
2276 | sd_printk(KERN_NOTICE, sdkp, |
2277 | "Uses READ/WRITE(6), disabling FUA\n"); | |
007365ad TH |
2278 | sdkp->DPOFUA = 0; |
2279 | } | |
2280 | ||
70a9b873 MP |
2281 | if (sdkp->first_scan || old_wce != sdkp->WCE || |
2282 | old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) | |
2283 | sd_printk(KERN_NOTICE, sdkp, | |
2284 | "Write cache: %s, read cache: %s, %s\n", | |
2285 | sdkp->WCE ? "enabled" : "disabled", | |
2286 | sdkp->RCD ? "disabled" : "enabled", | |
2287 | sdkp->DPOFUA ? "supports DPO and FUA" | |
2288 | : "doesn't support DPO or FUA"); | |
1da177e4 LT |
2289 | |
2290 | return; | |
2291 | } | |
2292 | ||
2293 | bad_sense: | |
ea73a9f2 | 2294 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
2295 | sshdr.sense_key == ILLEGAL_REQUEST && |
2296 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
e73aec82 MP |
2297 | /* Invalid field in CDB */ |
2298 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); | |
1da177e4 | 2299 | else |
e73aec82 | 2300 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
1da177e4 LT |
2301 | |
2302 | defaults: | |
b81478d8 NJ |
2303 | if (sdp->wce_default_on) { |
2304 | sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n"); | |
2305 | sdkp->WCE = 1; | |
2306 | } else { | |
2307 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); | |
2308 | sdkp->WCE = 0; | |
2309 | } | |
1da177e4 | 2310 | sdkp->RCD = 0; |
48970800 | 2311 | sdkp->DPOFUA = 0; |
1da177e4 LT |
2312 | } |
2313 | ||
e0597d70 MP |
2314 | /* |
2315 | * The ATO bit indicates whether the DIF application tag is available | |
2316 | * for use by the operating system. | |
2317 | */ | |
439d77f7 | 2318 | static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) |
e0597d70 MP |
2319 | { |
2320 | int res, offset; | |
2321 | struct scsi_device *sdp = sdkp->device; | |
2322 | struct scsi_mode_data data; | |
2323 | struct scsi_sense_hdr sshdr; | |
2324 | ||
2325 | if (sdp->type != TYPE_DISK) | |
2326 | return; | |
2327 | ||
2328 | if (sdkp->protection_type == 0) | |
2329 | return; | |
2330 | ||
2331 | res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, | |
2332 | SD_MAX_RETRIES, &data, &sshdr); | |
2333 | ||
2334 | if (!scsi_status_is_good(res) || !data.header_length || | |
2335 | data.length < 6) { | |
2336 | sd_printk(KERN_WARNING, sdkp, | |
2337 | "getting Control mode page failed, assume no ATO\n"); | |
2338 | ||
2339 | if (scsi_sense_valid(&sshdr)) | |
2340 | sd_print_sense_hdr(sdkp, &sshdr); | |
2341 | ||
2342 | return; | |
2343 | } | |
2344 | ||
2345 | offset = data.header_length + data.block_descriptor_length; | |
2346 | ||
2347 | if ((buffer[offset] & 0x3f) != 0x0a) { | |
2348 | sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); | |
2349 | return; | |
2350 | } | |
2351 | ||
2352 | if ((buffer[offset + 5] & 0x80) == 0) | |
2353 | return; | |
2354 | ||
2355 | sdkp->ATO = 1; | |
2356 | ||
2357 | return; | |
2358 | } | |
2359 | ||
d11b6916 MP |
2360 | /** |
2361 | * sd_read_block_limits - Query disk device for preferred I/O sizes. | |
2362 | * @disk: disk to query | |
2363 | */ | |
2364 | static void sd_read_block_limits(struct scsi_disk *sdkp) | |
2365 | { | |
2366 | unsigned int sector_sz = sdkp->device->sector_size; | |
bb2d3de1 | 2367 | const int vpd_len = 64; |
e3deec09 | 2368 | unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); |
d11b6916 | 2369 | |
e3deec09 JB |
2370 | if (!buffer || |
2371 | /* Block Limits VPD */ | |
2372 | scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) | |
2373 | goto out; | |
d11b6916 MP |
2374 | |
2375 | blk_queue_io_min(sdkp->disk->queue, | |
2376 | get_unaligned_be16(&buffer[6]) * sector_sz); | |
2377 | blk_queue_io_opt(sdkp->disk->queue, | |
2378 | get_unaligned_be32(&buffer[12]) * sector_sz); | |
2379 | ||
c98a0eb0 MP |
2380 | if (buffer[3] == 0x3c) { |
2381 | unsigned int lba_count, desc_count; | |
e339c1a7 | 2382 | |
c98a0eb0 MP |
2383 | sdkp->max_ws_blocks = |
2384 | (u32) min_not_zero(get_unaligned_be64(&buffer[36]), | |
2385 | (u64)0xffffffff); | |
e339c1a7 | 2386 | |
c98a0eb0 | 2387 | if (!sdkp->lbpme) |
045d3fe7 | 2388 | goto out; |
045d3fe7 | 2389 | |
c98a0eb0 MP |
2390 | lba_count = get_unaligned_be32(&buffer[20]); |
2391 | desc_count = get_unaligned_be32(&buffer[24]); | |
045d3fe7 | 2392 | |
c98a0eb0 MP |
2393 | if (lba_count && desc_count) |
2394 | sdkp->max_unmap_blocks = lba_count; | |
e339c1a7 | 2395 | |
c98a0eb0 | 2396 | sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]); |
e339c1a7 MP |
2397 | |
2398 | if (buffer[32] & 0x80) | |
c98a0eb0 | 2399 | sdkp->unmap_alignment = |
e339c1a7 | 2400 | get_unaligned_be32(&buffer[32]) & ~(1 << 31); |
c98a0eb0 MP |
2401 | |
2402 | if (!sdkp->lbpvpd) { /* LBP VPD page not provided */ | |
2403 | ||
2404 | if (sdkp->max_unmap_blocks) | |
2405 | sd_config_discard(sdkp, SD_LBP_UNMAP); | |
2406 | else | |
2407 | sd_config_discard(sdkp, SD_LBP_WS16); | |
2408 | ||
2409 | } else { /* LBP VPD page tells us what to use */ | |
2410 | ||
2411 | if (sdkp->lbpu && sdkp->max_unmap_blocks) | |
2412 | sd_config_discard(sdkp, SD_LBP_UNMAP); | |
2413 | else if (sdkp->lbpws) | |
2414 | sd_config_discard(sdkp, SD_LBP_WS16); | |
2415 | else if (sdkp->lbpws10) | |
2416 | sd_config_discard(sdkp, SD_LBP_WS10); | |
2417 | else | |
2418 | sd_config_discard(sdkp, SD_LBP_DISABLE); | |
2419 | } | |
e339c1a7 MP |
2420 | } |
2421 | ||
e3deec09 | 2422 | out: |
d11b6916 MP |
2423 | kfree(buffer); |
2424 | } | |
2425 | ||
3821d768 MP |
2426 | /** |
2427 | * sd_read_block_characteristics - Query block dev. characteristics | |
2428 | * @disk: disk to query | |
2429 | */ | |
2430 | static void sd_read_block_characteristics(struct scsi_disk *sdkp) | |
2431 | { | |
e3deec09 | 2432 | unsigned char *buffer; |
3821d768 | 2433 | u16 rot; |
bb2d3de1 | 2434 | const int vpd_len = 64; |
3821d768 | 2435 | |
e3deec09 | 2436 | buffer = kmalloc(vpd_len, GFP_KERNEL); |
3821d768 | 2437 | |
e3deec09 JB |
2438 | if (!buffer || |
2439 | /* Block Device Characteristics VPD */ | |
2440 | scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) | |
2441 | goto out; | |
3821d768 MP |
2442 | |
2443 | rot = get_unaligned_be16(&buffer[4]); | |
2444 | ||
2445 | if (rot == 1) | |
2446 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); | |
2447 | ||
e3deec09 | 2448 | out: |
3821d768 MP |
2449 | kfree(buffer); |
2450 | } | |
2451 | ||
045d3fe7 | 2452 | /** |
c98a0eb0 | 2453 | * sd_read_block_provisioning - Query provisioning VPD page |
045d3fe7 MP |
2454 | * @disk: disk to query |
2455 | */ | |
c98a0eb0 | 2456 | static void sd_read_block_provisioning(struct scsi_disk *sdkp) |
045d3fe7 MP |
2457 | { |
2458 | unsigned char *buffer; | |
2459 | const int vpd_len = 8; | |
2460 | ||
c98a0eb0 | 2461 | if (sdkp->lbpme == 0) |
045d3fe7 MP |
2462 | return; |
2463 | ||
2464 | buffer = kmalloc(vpd_len, GFP_KERNEL); | |
2465 | ||
2466 | if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len)) | |
2467 | goto out; | |
2468 | ||
c98a0eb0 MP |
2469 | sdkp->lbpvpd = 1; |
2470 | sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */ | |
2471 | sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */ | |
2472 | sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */ | |
045d3fe7 MP |
2473 | |
2474 | out: | |
2475 | kfree(buffer); | |
2476 | } | |
2477 | ||
ffd4bc2a MP |
2478 | static int sd_try_extended_inquiry(struct scsi_device *sdp) |
2479 | { | |
2480 | /* | |
2481 | * Although VPD inquiries can go to SCSI-2 type devices, | |
2482 | * some USB ones crash on receiving them, and the pages | |
2483 | * we currently ask for are for SPC-3 and beyond | |
2484 | */ | |
09b6b51b | 2485 | if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages) |
ffd4bc2a MP |
2486 | return 1; |
2487 | return 0; | |
2488 | } | |
2489 | ||
1da177e4 LT |
2490 | /** |
2491 | * sd_revalidate_disk - called the first time a new disk is seen, | |
2492 | * performs disk spin up, read_capacity, etc. | |
2493 | * @disk: struct gendisk we care about | |
2494 | **/ | |
2495 | static int sd_revalidate_disk(struct gendisk *disk) | |
2496 | { | |
2497 | struct scsi_disk *sdkp = scsi_disk(disk); | |
2498 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 2499 | unsigned char *buffer; |
4913efe4 | 2500 | unsigned flush = 0; |
1da177e4 | 2501 | |
fa0d34be MP |
2502 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
2503 | "sd_revalidate_disk\n")); | |
1da177e4 LT |
2504 | |
2505 | /* | |
2506 | * If the device is offline, don't try and read capacity or any | |
2507 | * of the other niceties. | |
2508 | */ | |
2509 | if (!scsi_device_online(sdp)) | |
2510 | goto out; | |
2511 | ||
a6123f14 | 2512 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); |
1da177e4 | 2513 | if (!buffer) { |
e73aec82 MP |
2514 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
2515 | "allocation failure.\n"); | |
ea73a9f2 | 2516 | goto out; |
1da177e4 LT |
2517 | } |
2518 | ||
e73aec82 | 2519 | sd_spinup_disk(sdkp); |
1da177e4 LT |
2520 | |
2521 | /* | |
2522 | * Without media there is no reason to ask; moreover, some devices | |
2523 | * react badly if we do. | |
2524 | */ | |
2525 | if (sdkp->media_present) { | |
e73aec82 | 2526 | sd_read_capacity(sdkp, buffer); |
ffd4bc2a MP |
2527 | |
2528 | if (sd_try_extended_inquiry(sdp)) { | |
c98a0eb0 | 2529 | sd_read_block_provisioning(sdkp); |
ffd4bc2a MP |
2530 | sd_read_block_limits(sdkp); |
2531 | sd_read_block_characteristics(sdkp); | |
2532 | } | |
2533 | ||
e73aec82 MP |
2534 | sd_read_write_protect_flag(sdkp, buffer); |
2535 | sd_read_cache_type(sdkp, buffer); | |
e0597d70 | 2536 | sd_read_app_tag_own(sdkp, buffer); |
1da177e4 | 2537 | } |
461d4e90 | 2538 | |
70a9b873 MP |
2539 | sdkp->first_scan = 0; |
2540 | ||
461d4e90 TH |
2541 | /* |
2542 | * We now have all cache related info, determine how we deal | |
4913efe4 | 2543 | * with flush requests. |
461d4e90 | 2544 | */ |
4913efe4 TH |
2545 | if (sdkp->WCE) { |
2546 | flush |= REQ_FLUSH; | |
2547 | if (sdkp->DPOFUA) | |
2548 | flush |= REQ_FUA; | |
2549 | } | |
461d4e90 | 2550 | |
4913efe4 | 2551 | blk_queue_flush(sdkp->disk->queue, flush); |
461d4e90 | 2552 | |
1da177e4 LT |
2553 | set_capacity(disk, sdkp->capacity); |
2554 | kfree(buffer); | |
2555 | ||
1da177e4 LT |
2556 | out: |
2557 | return 0; | |
2558 | } | |
2559 | ||
72ec24bd TH |
2560 | /** |
2561 | * sd_unlock_native_capacity - unlock native capacity | |
2562 | * @disk: struct gendisk to set capacity for | |
2563 | * | |
2564 | * Block layer calls this function if it detects that partitions | |
2565 | * on @disk reach beyond the end of the device. If the SCSI host | |
2566 | * implements ->unlock_native_capacity() method, it's invoked to | |
2567 | * give it a chance to adjust the device capacity. | |
2568 | * | |
2569 | * CONTEXT: | |
2570 | * Defined by block layer. Might sleep. | |
2571 | */ | |
2572 | static void sd_unlock_native_capacity(struct gendisk *disk) | |
2573 | { | |
2574 | struct scsi_device *sdev = scsi_disk(disk)->device; | |
2575 | ||
2576 | if (sdev->host->hostt->unlock_native_capacity) | |
2577 | sdev->host->hostt->unlock_native_capacity(sdev); | |
2578 | } | |
2579 | ||
3e1a7ff8 TH |
2580 | /** |
2581 | * sd_format_disk_name - format disk name | |
2582 | * @prefix: name prefix - ie. "sd" for SCSI disks | |
2583 | * @index: index of the disk to format name for | |
2584 | * @buf: output buffer | |
2585 | * @buflen: length of the output buffer | |
2586 | * | |
2587 | * SCSI disk names starts at sda. The 26th device is sdz and the | |
2588 | * 27th is sdaa. The last one for two lettered suffix is sdzz | |
2589 | * which is followed by sdaaa. | |
2590 | * | |
2591 | * This is basically 26 base counting with one extra 'nil' entry | |
3ad2f3fb | 2592 | * at the beginning from the second digit on and can be |
3e1a7ff8 TH |
2593 | * determined using similar method as 26 base conversion with the |
2594 | * index shifted -1 after each digit is computed. | |
2595 | * | |
2596 | * CONTEXT: | |
2597 | * Don't care. | |
2598 | * | |
2599 | * RETURNS: | |
2600 | * 0 on success, -errno on failure. | |
2601 | */ | |
2602 | static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) | |
2603 | { | |
2604 | const int base = 'z' - 'a' + 1; | |
2605 | char *begin = buf + strlen(prefix); | |
2606 | char *end = buf + buflen; | |
2607 | char *p; | |
2608 | int unit; | |
2609 | ||
2610 | p = end - 1; | |
2611 | *p = '\0'; | |
2612 | unit = base; | |
2613 | do { | |
2614 | if (p == begin) | |
2615 | return -EINVAL; | |
2616 | *--p = 'a' + (index % unit); | |
2617 | index = (index / unit) - 1; | |
2618 | } while (index >= 0); | |
2619 | ||
2620 | memmove(begin, p, end - p); | |
2621 | memcpy(buf, prefix, strlen(prefix)); | |
2622 | ||
2623 | return 0; | |
2624 | } | |
2625 | ||
4ace92fc AV |
2626 | /* |
2627 | * The asynchronous part of sd_probe | |
2628 | */ | |
2629 | static void sd_probe_async(void *data, async_cookie_t cookie) | |
2630 | { | |
2631 | struct scsi_disk *sdkp = data; | |
2632 | struct scsi_device *sdp; | |
2633 | struct gendisk *gd; | |
2634 | u32 index; | |
2635 | struct device *dev; | |
2636 | ||
2637 | sdp = sdkp->device; | |
2638 | gd = sdkp->disk; | |
2639 | index = sdkp->index; | |
2640 | dev = &sdp->sdev_gendev; | |
2641 | ||
1a03ae0f MR |
2642 | gd->major = sd_major((index & 0xf0) >> 4); |
2643 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
2644 | gd->minors = SD_MINORS; | |
2645 | ||
4ace92fc AV |
2646 | gd->fops = &sd_fops; |
2647 | gd->private_data = &sdkp->driver; | |
2648 | gd->queue = sdkp->device->request_queue; | |
2649 | ||
70a9b873 MP |
2650 | /* defaults, until the device tells us otherwise */ |
2651 | sdp->sector_size = 512; | |
2652 | sdkp->capacity = 0; | |
2653 | sdkp->media_present = 1; | |
2654 | sdkp->write_prot = 0; | |
2655 | sdkp->WCE = 0; | |
2656 | sdkp->RCD = 0; | |
2657 | sdkp->ATO = 0; | |
2658 | sdkp->first_scan = 1; | |
18a4d0a2 | 2659 | sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS; |
70a9b873 | 2660 | |
4ace92fc AV |
2661 | sd_revalidate_disk(gd); |
2662 | ||
2663 | blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); | |
f1126e95 | 2664 | blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn); |
4ace92fc AV |
2665 | |
2666 | gd->driverfs_dev = &sdp->sdev_gendev; | |
97fedbbe | 2667 | gd->flags = GENHD_FL_EXT_DEVT; |
2bae0093 | 2668 | if (sdp->removable) { |
4ace92fc | 2669 | gd->flags |= GENHD_FL_REMOVABLE; |
2bae0093 TH |
2670 | gd->events |= DISK_EVENT_MEDIA_CHANGE; |
2671 | } | |
4ace92fc | 2672 | |
4ace92fc | 2673 | add_disk(gd); |
fe542396 MP |
2674 | if (sdkp->capacity) |
2675 | sd_dif_config_host(sdkp); | |
4ace92fc | 2676 | |
3821d768 MP |
2677 | sd_revalidate_disk(gd); |
2678 | ||
4ace92fc AV |
2679 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
2680 | sdp->removable ? "removable " : ""); | |
478a8a05 | 2681 | scsi_autopm_put_device(sdp); |
ea038f63 | 2682 | put_device(&sdkp->dev); |
4ace92fc AV |
2683 | } |
2684 | ||
1da177e4 LT |
2685 | /** |
2686 | * sd_probe - called during driver initialization and whenever a | |
2687 | * new scsi device is attached to the system. It is called once | |
2688 | * for each scsi device (not just disks) present. | |
2689 | * @dev: pointer to device object | |
2690 | * | |
2691 | * Returns 0 if successful (or not interested in this scsi device | |
2692 | * (e.g. scanner)); 1 when there is an error. | |
2693 | * | |
2694 | * Note: this function is invoked from the scsi mid-level. | |
2695 | * This function sets up the mapping between a given | |
2696 | * <host,channel,id,lun> (found in sdp) and new device name | |
2697 | * (e.g. /dev/sda). More precisely it is the block device major | |
2698 | * and minor number that is chosen here. | |
2699 | * | |
2db93ce8 PU |
2700 | * Assume sd_probe is not re-entrant (for time being) |
2701 | * Also think about sd_probe() and sd_remove() running coincidentally. | |
1da177e4 LT |
2702 | **/ |
2703 | static int sd_probe(struct device *dev) | |
2704 | { | |
2705 | struct scsi_device *sdp = to_scsi_device(dev); | |
2706 | struct scsi_disk *sdkp; | |
2707 | struct gendisk *gd; | |
439d77f7 | 2708 | int index; |
1da177e4 LT |
2709 | int error; |
2710 | ||
2711 | error = -ENODEV; | |
631e8a13 | 2712 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
2713 | goto out; |
2714 | ||
9ccfc756 | 2715 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
2db93ce8 | 2716 | "sd_probe\n")); |
1da177e4 LT |
2717 | |
2718 | error = -ENOMEM; | |
24669f75 | 2719 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
2720 | if (!sdkp) |
2721 | goto out; | |
2722 | ||
689d6fac | 2723 | gd = alloc_disk(SD_MINORS); |
1da177e4 LT |
2724 | if (!gd) |
2725 | goto out_free; | |
2726 | ||
f27bac27 TH |
2727 | do { |
2728 | if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) | |
2729 | goto out_put; | |
1da177e4 | 2730 | |
4034cc68 | 2731 | spin_lock(&sd_index_lock); |
f27bac27 | 2732 | error = ida_get_new(&sd_index_ida, &index); |
4034cc68 | 2733 | spin_unlock(&sd_index_lock); |
f27bac27 | 2734 | } while (error == -EAGAIN); |
1da177e4 | 2735 | |
21208ae5 DK |
2736 | if (error) { |
2737 | sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n"); | |
1da177e4 | 2738 | goto out_put; |
1a03ae0f MR |
2739 | } |
2740 | ||
3e1a7ff8 | 2741 | error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); |
21208ae5 DK |
2742 | if (error) { |
2743 | sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n"); | |
f27bac27 | 2744 | goto out_free_index; |
21208ae5 | 2745 | } |
f27bac27 | 2746 | |
1da177e4 LT |
2747 | sdkp->device = sdp; |
2748 | sdkp->driver = &sd_template; | |
2749 | sdkp->disk = gd; | |
2750 | sdkp->index = index; | |
409f3499 | 2751 | atomic_set(&sdkp->openers, 0); |
9e1a1537 | 2752 | atomic_set(&sdkp->device->ioerr_cnt, 0); |
1da177e4 | 2753 | |
601e7638 JB |
2754 | if (!sdp->request_queue->rq_timeout) { |
2755 | if (sdp->type != TYPE_MOD) | |
2756 | blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); | |
2757 | else | |
2758 | blk_queue_rq_timeout(sdp->request_queue, | |
2759 | SD_MOD_TIMEOUT); | |
2760 | } | |
2761 | ||
2762 | device_initialize(&sdkp->dev); | |
478a8a05 | 2763 | sdkp->dev.parent = dev; |
601e7638 | 2764 | sdkp->dev.class = &sd_disk_class; |
478a8a05 | 2765 | dev_set_name(&sdkp->dev, dev_name(dev)); |
601e7638 JB |
2766 | |
2767 | if (device_add(&sdkp->dev)) | |
2768 | goto out_free_index; | |
2769 | ||
478a8a05 AS |
2770 | get_device(dev); |
2771 | dev_set_drvdata(dev, sdkp); | |
601e7638 | 2772 | |
ea038f63 | 2773 | get_device(&sdkp->dev); /* prevent release before async_schedule */ |
a7a20d10 | 2774 | async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); |
1da177e4 LT |
2775 | |
2776 | return 0; | |
2777 | ||
f27bac27 | 2778 | out_free_index: |
4034cc68 | 2779 | spin_lock(&sd_index_lock); |
f27bac27 | 2780 | ida_remove(&sd_index_ida, index); |
4034cc68 | 2781 | spin_unlock(&sd_index_lock); |
6bdaa1f1 | 2782 | out_put: |
1da177e4 | 2783 | put_disk(gd); |
6bdaa1f1 | 2784 | out_free: |
1da177e4 | 2785 | kfree(sdkp); |
6bdaa1f1 | 2786 | out: |
1da177e4 LT |
2787 | return error; |
2788 | } | |
2789 | ||
2790 | /** | |
2791 | * sd_remove - called whenever a scsi disk (previously recognized by | |
2792 | * sd_probe) is detached from the system. It is called (potentially | |
2793 | * multiple times) during sd module unload. | |
2794 | * @sdp: pointer to mid level scsi device object | |
2795 | * | |
2796 | * Note: this function is invoked from the scsi mid-level. | |
2797 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
2798 | * that could be re-used by a subsequent sd_probe(). | |
2799 | * This function is not called when the built-in sd driver is "exit-ed". | |
2800 | **/ | |
2801 | static int sd_remove(struct device *dev) | |
2802 | { | |
601e7638 | 2803 | struct scsi_disk *sdkp; |
1da177e4 | 2804 | |
601e7638 | 2805 | sdkp = dev_get_drvdata(dev); |
478a8a05 AS |
2806 | scsi_autopm_get_device(sdkp->device); |
2807 | ||
a7a20d10 | 2808 | async_synchronize_full_domain(&scsi_sd_probe_domain); |
b391277a | 2809 | blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); |
82b6d57f | 2810 | blk_queue_unprep_rq(sdkp->device->request_queue, NULL); |
ee959b00 | 2811 | device_del(&sdkp->dev); |
1da177e4 LT |
2812 | del_gendisk(sdkp->disk); |
2813 | sd_shutdown(dev); | |
39b7f1e2 | 2814 | |
0b950672 | 2815 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 2816 | dev_set_drvdata(dev, NULL); |
ee959b00 | 2817 | put_device(&sdkp->dev); |
0b950672 | 2818 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
2819 | |
2820 | return 0; | |
2821 | } | |
2822 | ||
2823 | /** | |
2824 | * scsi_disk_release - Called to free the scsi_disk structure | |
ee959b00 | 2825 | * @dev: pointer to embedded class device |
1da177e4 | 2826 | * |
0b950672 | 2827 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
2828 | * called on last put, you should always use the scsi_disk_get() |
2829 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
ee959b00 | 2830 | * and never do a direct put_device. |
1da177e4 | 2831 | **/ |
ee959b00 | 2832 | static void scsi_disk_release(struct device *dev) |
1da177e4 | 2833 | { |
ee959b00 | 2834 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
1da177e4 LT |
2835 | struct gendisk *disk = sdkp->disk; |
2836 | ||
4034cc68 | 2837 | spin_lock(&sd_index_lock); |
f27bac27 | 2838 | ida_remove(&sd_index_ida, sdkp->index); |
4034cc68 | 2839 | spin_unlock(&sd_index_lock); |
1da177e4 LT |
2840 | |
2841 | disk->private_data = NULL; | |
1da177e4 | 2842 | put_disk(disk); |
39b7f1e2 | 2843 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
2844 | |
2845 | kfree(sdkp); | |
2846 | } | |
2847 | ||
cc5d2c8c | 2848 | static int sd_start_stop_device(struct scsi_disk *sdkp, int start) |
c3c94c5a TH |
2849 | { |
2850 | unsigned char cmd[6] = { START_STOP }; /* START_VALID */ | |
2851 | struct scsi_sense_hdr sshdr; | |
cc5d2c8c | 2852 | struct scsi_device *sdp = sdkp->device; |
c3c94c5a TH |
2853 | int res; |
2854 | ||
2855 | if (start) | |
2856 | cmd[4] |= 1; /* START */ | |
2857 | ||
d2886ea3 SR |
2858 | if (sdp->start_stop_pwr_cond) |
2859 | cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ | |
2860 | ||
c3c94c5a TH |
2861 | if (!scsi_device_online(sdp)) |
2862 | return -ENODEV; | |
2863 | ||
2864 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, | |
f4f4e47e | 2865 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
c3c94c5a | 2866 | if (res) { |
cc5d2c8c JB |
2867 | sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
2868 | sd_print_result(sdkp, res); | |
c3c94c5a | 2869 | if (driver_byte(res) & DRIVER_SENSE) |
cc5d2c8c | 2870 | sd_print_sense_hdr(sdkp, &sshdr); |
c3c94c5a TH |
2871 | } |
2872 | ||
2873 | return res; | |
2874 | } | |
2875 | ||
1da177e4 LT |
2876 | /* |
2877 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
2878 | * the normal SCSI command structure. Wait for the command to | |
2879 | * complete. | |
2880 | */ | |
2881 | static void sd_shutdown(struct device *dev) | |
2882 | { | |
39b7f1e2 | 2883 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
2884 | |
2885 | if (!sdkp) | |
2886 | return; /* this can happen */ | |
2887 | ||
54f57588 LM |
2888 | if (pm_runtime_suspended(dev)) |
2889 | goto exit; | |
2890 | ||
39b7f1e2 | 2891 | if (sdkp->WCE) { |
e73aec82 MP |
2892 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
2893 | sd_sync_cache(sdkp); | |
39b7f1e2 | 2894 | } |
c3c94c5a | 2895 | |
cc5d2c8c JB |
2896 | if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { |
2897 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); | |
2898 | sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2899 | } |
2900 | ||
54f57588 | 2901 | exit: |
39b7f1e2 AS |
2902 | scsi_disk_put(sdkp); |
2903 | } | |
1da177e4 | 2904 | |
c3c94c5a TH |
2905 | static int sd_suspend(struct device *dev, pm_message_t mesg) |
2906 | { | |
c3c94c5a | 2907 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2908 | int ret = 0; |
c3c94c5a TH |
2909 | |
2910 | if (!sdkp) | |
2911 | return 0; /* this can happen */ | |
2912 | ||
2913 | if (sdkp->WCE) { | |
cc5d2c8c | 2914 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
c3c94c5a TH |
2915 | ret = sd_sync_cache(sdkp); |
2916 | if (ret) | |
09ff92fe | 2917 | goto done; |
c3c94c5a TH |
2918 | } |
2919 | ||
3a2d5b70 | 2920 | if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { |
cc5d2c8c JB |
2921 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
2922 | ret = sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2923 | } |
2924 | ||
09ff92fe AS |
2925 | done: |
2926 | scsi_disk_put(sdkp); | |
2927 | return ret; | |
c3c94c5a TH |
2928 | } |
2929 | ||
2930 | static int sd_resume(struct device *dev) | |
2931 | { | |
c3c94c5a | 2932 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2933 | int ret = 0; |
c3c94c5a | 2934 | |
cc5d2c8c | 2935 | if (!sdkp->device->manage_start_stop) |
09ff92fe | 2936 | goto done; |
c3c94c5a | 2937 | |
cc5d2c8c | 2938 | sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
09ff92fe | 2939 | ret = sd_start_stop_device(sdkp, 1); |
c3c94c5a | 2940 | |
09ff92fe AS |
2941 | done: |
2942 | scsi_disk_put(sdkp); | |
2943 | return ret; | |
c3c94c5a TH |
2944 | } |
2945 | ||
1da177e4 LT |
2946 | /** |
2947 | * init_sd - entry point for this driver (both when built in or when | |
2948 | * a module). | |
2949 | * | |
2950 | * Note: this function registers this driver with the scsi mid-level. | |
2951 | **/ | |
2952 | static int __init init_sd(void) | |
2953 | { | |
5e4009ba | 2954 | int majors = 0, i, err; |
1da177e4 LT |
2955 | |
2956 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
2957 | ||
2958 | for (i = 0; i < SD_MAJORS; i++) | |
2959 | if (register_blkdev(sd_major(i), "sd") == 0) | |
2960 | majors++; | |
2961 | ||
2962 | if (!majors) | |
2963 | return -ENODEV; | |
2964 | ||
5e4009ba JG |
2965 | err = class_register(&sd_disk_class); |
2966 | if (err) | |
2967 | goto err_out; | |
6bdaa1f1 | 2968 | |
5e4009ba JG |
2969 | err = scsi_register_driver(&sd_template.gendrv); |
2970 | if (err) | |
2971 | goto err_out_class; | |
2972 | ||
4e7392ec MP |
2973 | sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, |
2974 | 0, 0, NULL); | |
2975 | if (!sd_cdb_cache) { | |
2976 | printk(KERN_ERR "sd: can't init extended cdb cache\n"); | |
2977 | goto err_out_class; | |
2978 | } | |
2979 | ||
2980 | sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); | |
2981 | if (!sd_cdb_pool) { | |
2982 | printk(KERN_ERR "sd: can't init extended cdb pool\n"); | |
2983 | goto err_out_cache; | |
2984 | } | |
2985 | ||
5e4009ba JG |
2986 | return 0; |
2987 | ||
4e7392ec MP |
2988 | err_out_cache: |
2989 | kmem_cache_destroy(sd_cdb_cache); | |
2990 | ||
5e4009ba JG |
2991 | err_out_class: |
2992 | class_unregister(&sd_disk_class); | |
2993 | err_out: | |
2994 | for (i = 0; i < SD_MAJORS; i++) | |
2995 | unregister_blkdev(sd_major(i), "sd"); | |
2996 | return err; | |
1da177e4 LT |
2997 | } |
2998 | ||
2999 | /** | |
3000 | * exit_sd - exit point for this driver (when it is a module). | |
3001 | * | |
3002 | * Note: this function unregisters this driver from the scsi mid-level. | |
3003 | **/ | |
3004 | static void __exit exit_sd(void) | |
3005 | { | |
3006 | int i; | |
3007 | ||
3008 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
3009 | ||
4e7392ec MP |
3010 | mempool_destroy(sd_cdb_pool); |
3011 | kmem_cache_destroy(sd_cdb_cache); | |
3012 | ||
1da177e4 | 3013 | scsi_unregister_driver(&sd_template.gendrv); |
5e4009ba JG |
3014 | class_unregister(&sd_disk_class); |
3015 | ||
1da177e4 LT |
3016 | for (i = 0; i < SD_MAJORS; i++) |
3017 | unregister_blkdev(sd_major(i), "sd"); | |
3018 | } | |
3019 | ||
1da177e4 LT |
3020 | module_init(init_sd); |
3021 | module_exit(exit_sd); | |
e73aec82 MP |
3022 | |
3023 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, | |
3024 | struct scsi_sense_hdr *sshdr) | |
3025 | { | |
2e4c3329 | 3026 | sd_printk(KERN_INFO, sdkp, " "); |
e73aec82 | 3027 | scsi_show_sense_hdr(sshdr); |
2e4c3329 | 3028 | sd_printk(KERN_INFO, sdkp, " "); |
e73aec82 MP |
3029 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); |
3030 | } | |
3031 | ||
3032 | static void sd_print_result(struct scsi_disk *sdkp, int result) | |
3033 | { | |
2e4c3329 | 3034 | sd_printk(KERN_INFO, sdkp, " "); |
e73aec82 MP |
3035 | scsi_show_result(result); |
3036 | } | |
3037 |