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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> |
1da177e4 | 53 | #include <asm/uaccess.h> |
8f76d151 | 54 | #include <asm/unaligned.h> |
1da177e4 LT |
55 | |
56 | #include <scsi/scsi.h> | |
57 | #include <scsi/scsi_cmnd.h> | |
58 | #include <scsi/scsi_dbg.h> | |
59 | #include <scsi/scsi_device.h> | |
60 | #include <scsi/scsi_driver.h> | |
61 | #include <scsi/scsi_eh.h> | |
62 | #include <scsi/scsi_host.h> | |
63 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
64 | #include <scsi/scsicam.h> |
65 | ||
aa91696e | 66 | #include "sd.h" |
1da177e4 LT |
67 | #include "scsi_logging.h" |
68 | ||
f018fa55 RH |
69 | MODULE_AUTHOR("Eric Youngdale"); |
70 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
71 | MODULE_LICENSE("GPL"); | |
72 | ||
73 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
74 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
75 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
85 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
86 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
87 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
88 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
d7b8bcb0 MT |
89 | MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); |
90 | MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); | |
91 | MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); | |
f018fa55 | 92 | |
870d6656 | 93 | #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) |
f615b48c | 94 | #define SD_MINORS 16 |
870d6656 | 95 | #else |
3e1a7ff8 | 96 | #define SD_MINORS 0 |
870d6656 TH |
97 | #endif |
98 | ||
7b3d9545 LT |
99 | static int sd_revalidate_disk(struct gendisk *); |
100 | static int sd_probe(struct device *); | |
101 | static int sd_remove(struct device *); | |
102 | static void sd_shutdown(struct device *); | |
103 | static int sd_suspend(struct device *, pm_message_t state); | |
104 | static int sd_resume(struct device *); | |
105 | static void sd_rescan(struct device *); | |
106 | static int sd_done(struct scsi_cmnd *); | |
107 | static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); | |
ee959b00 | 108 | static void scsi_disk_release(struct device *cdev); |
7b3d9545 LT |
109 | static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); |
110 | static void sd_print_result(struct scsi_disk *, int); | |
111 | ||
4034cc68 | 112 | static DEFINE_SPINLOCK(sd_index_lock); |
f27bac27 | 113 | static DEFINE_IDA(sd_index_ida); |
1da177e4 LT |
114 | |
115 | /* This semaphore is used to mediate the 0->1 reference get in the | |
116 | * face of object destruction (i.e. we can't allow a get on an | |
117 | * object after last put) */ | |
0b950672 | 118 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 | 119 | |
4e7392ec MP |
120 | struct kmem_cache *sd_cdb_cache; |
121 | mempool_t *sd_cdb_pool; | |
122 | ||
6bdaa1f1 JB |
123 | static const char *sd_cache_types[] = { |
124 | "write through", "none", "write back", | |
125 | "write back, no read (daft)" | |
126 | }; | |
127 | ||
ee959b00 TJ |
128 | static ssize_t |
129 | sd_store_cache_type(struct device *dev, struct device_attribute *attr, | |
130 | const char *buf, size_t count) | |
6bdaa1f1 JB |
131 | { |
132 | int i, ct = -1, rcd, wce, sp; | |
ee959b00 | 133 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
134 | struct scsi_device *sdp = sdkp->device; |
135 | char buffer[64]; | |
136 | char *buffer_data; | |
137 | struct scsi_mode_data data; | |
138 | struct scsi_sense_hdr sshdr; | |
139 | int len; | |
140 | ||
141 | if (sdp->type != TYPE_DISK) | |
142 | /* no cache control on RBC devices; theoretically they | |
143 | * can do it, but there's probably so many exceptions | |
144 | * it's not worth the risk */ | |
145 | return -EINVAL; | |
146 | ||
6391a113 | 147 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
148 | const int len = strlen(sd_cache_types[i]); |
149 | if (strncmp(sd_cache_types[i], buf, len) == 0 && | |
150 | buf[len] == '\n') { | |
151 | ct = i; | |
152 | break; | |
153 | } | |
154 | } | |
155 | if (ct < 0) | |
156 | return -EINVAL; | |
157 | rcd = ct & 0x01 ? 1 : 0; | |
158 | wce = ct & 0x02 ? 1 : 0; | |
159 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
160 | SD_MAX_RETRIES, &data, NULL)) | |
161 | return -EINVAL; | |
a9312fb8 | 162 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
163 | data.block_descriptor_length); |
164 | buffer_data = buffer + data.header_length + | |
165 | data.block_descriptor_length; | |
166 | buffer_data[2] &= ~0x05; | |
167 | buffer_data[2] |= wce << 2 | rcd; | |
168 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
169 | ||
170 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
171 | SD_MAX_RETRIES, &data, &sshdr)) { | |
172 | if (scsi_sense_valid(&sshdr)) | |
e73aec82 | 173 | sd_print_sense_hdr(sdkp, &sshdr); |
6bdaa1f1 JB |
174 | return -EINVAL; |
175 | } | |
f98a8cae | 176 | revalidate_disk(sdkp->disk); |
6bdaa1f1 JB |
177 | return count; |
178 | } | |
179 | ||
ee959b00 TJ |
180 | static ssize_t |
181 | sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
182 | const char *buf, size_t count) | |
c3c94c5a | 183 | { |
ee959b00 | 184 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
185 | struct scsi_device *sdp = sdkp->device; |
186 | ||
187 | if (!capable(CAP_SYS_ADMIN)) | |
188 | return -EACCES; | |
189 | ||
190 | sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); | |
191 | ||
192 | return count; | |
193 | } | |
194 | ||
ee959b00 TJ |
195 | static ssize_t |
196 | sd_store_allow_restart(struct device *dev, struct device_attribute *attr, | |
197 | const char *buf, size_t count) | |
a144c5ae | 198 | { |
ee959b00 | 199 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
200 | struct scsi_device *sdp = sdkp->device; |
201 | ||
202 | if (!capable(CAP_SYS_ADMIN)) | |
203 | return -EACCES; | |
204 | ||
205 | if (sdp->type != TYPE_DISK) | |
206 | return -EINVAL; | |
207 | ||
208 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); | |
209 | ||
210 | return count; | |
211 | } | |
212 | ||
ee959b00 TJ |
213 | static ssize_t |
214 | sd_show_cache_type(struct device *dev, struct device_attribute *attr, | |
215 | char *buf) | |
6bdaa1f1 | 216 | { |
ee959b00 | 217 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
218 | int ct = sdkp->RCD + 2*sdkp->WCE; |
219 | ||
220 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
221 | } | |
222 | ||
ee959b00 TJ |
223 | static ssize_t |
224 | sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) | |
6bdaa1f1 | 225 | { |
ee959b00 | 226 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
227 | |
228 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
229 | } | |
230 | ||
ee959b00 TJ |
231 | static ssize_t |
232 | sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
233 | char *buf) | |
c3c94c5a | 234 | { |
ee959b00 | 235 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
236 | struct scsi_device *sdp = sdkp->device; |
237 | ||
238 | return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); | |
239 | } | |
240 | ||
ee959b00 TJ |
241 | static ssize_t |
242 | sd_show_allow_restart(struct device *dev, struct device_attribute *attr, | |
243 | char *buf) | |
a144c5ae | 244 | { |
ee959b00 | 245 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
246 | |
247 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
248 | } | |
249 | ||
e0597d70 MP |
250 | static ssize_t |
251 | sd_show_protection_type(struct device *dev, struct device_attribute *attr, | |
252 | char *buf) | |
253 | { | |
254 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
255 | ||
256 | return snprintf(buf, 20, "%u\n", sdkp->protection_type); | |
257 | } | |
258 | ||
259 | static ssize_t | |
260 | sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, | |
261 | char *buf) | |
262 | { | |
263 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
264 | ||
265 | return snprintf(buf, 20, "%u\n", sdkp->ATO); | |
266 | } | |
267 | ||
e339c1a7 MP |
268 | static ssize_t |
269 | sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr, | |
270 | char *buf) | |
271 | { | |
272 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
273 | ||
274 | return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning); | |
275 | } | |
276 | ||
ee959b00 | 277 | static struct device_attribute sd_disk_attrs[] = { |
6bdaa1f1 JB |
278 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, |
279 | sd_store_cache_type), | |
280 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
a144c5ae BK |
281 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
282 | sd_store_allow_restart), | |
c3c94c5a TH |
283 | __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
284 | sd_store_manage_start_stop), | |
e0597d70 MP |
285 | __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), |
286 | __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), | |
e339c1a7 | 287 | __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL), |
6bdaa1f1 JB |
288 | __ATTR_NULL, |
289 | }; | |
290 | ||
291 | static struct class sd_disk_class = { | |
292 | .name = "scsi_disk", | |
293 | .owner = THIS_MODULE, | |
ee959b00 TJ |
294 | .dev_release = scsi_disk_release, |
295 | .dev_attrs = sd_disk_attrs, | |
6bdaa1f1 | 296 | }; |
1da177e4 LT |
297 | |
298 | static struct scsi_driver sd_template = { | |
299 | .owner = THIS_MODULE, | |
300 | .gendrv = { | |
301 | .name = "sd", | |
302 | .probe = sd_probe, | |
303 | .remove = sd_remove, | |
c3c94c5a TH |
304 | .suspend = sd_suspend, |
305 | .resume = sd_resume, | |
1da177e4 LT |
306 | .shutdown = sd_shutdown, |
307 | }, | |
308 | .rescan = sd_rescan, | |
7b3d9545 | 309 | .done = sd_done, |
1da177e4 LT |
310 | }; |
311 | ||
312 | /* | |
313 | * Device no to disk mapping: | |
314 | * | |
315 | * major disc2 disc p1 | |
316 | * |............|.............|....|....| <- dev_t | |
317 | * 31 20 19 8 7 4 3 0 | |
318 | * | |
319 | * Inside a major, we have 16k disks, however mapped non- | |
320 | * contiguously. The first 16 disks are for major0, the next | |
321 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
322 | * for major1, ... | |
323 | * As we stay compatible with our numbering scheme, we can reuse | |
324 | * the well-know SCSI majors 8, 65--71, 136--143. | |
325 | */ | |
326 | static int sd_major(int major_idx) | |
327 | { | |
328 | switch (major_idx) { | |
329 | case 0: | |
330 | return SCSI_DISK0_MAJOR; | |
331 | case 1 ... 7: | |
332 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
333 | case 8 ... 15: | |
334 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
335 | default: | |
336 | BUG(); | |
337 | return 0; /* shut up gcc */ | |
338 | } | |
339 | } | |
340 | ||
39b7f1e2 | 341 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
342 | { |
343 | struct scsi_disk *sdkp = NULL; | |
344 | ||
39b7f1e2 AS |
345 | if (disk->private_data) { |
346 | sdkp = scsi_disk(disk); | |
347 | if (scsi_device_get(sdkp->device) == 0) | |
ee959b00 | 348 | get_device(&sdkp->dev); |
39b7f1e2 AS |
349 | else |
350 | sdkp = NULL; | |
351 | } | |
352 | return sdkp; | |
353 | } | |
354 | ||
355 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
356 | { | |
357 | struct scsi_disk *sdkp; | |
358 | ||
0b950672 | 359 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 360 | sdkp = __scsi_disk_get(disk); |
0b950672 | 361 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 362 | return sdkp; |
39b7f1e2 | 363 | } |
1da177e4 | 364 | |
39b7f1e2 AS |
365 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
366 | { | |
367 | struct scsi_disk *sdkp; | |
368 | ||
0b950672 | 369 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
370 | sdkp = dev_get_drvdata(dev); |
371 | if (sdkp) | |
372 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 373 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
374 | return sdkp; |
375 | } | |
376 | ||
377 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
378 | { | |
379 | struct scsi_device *sdev = sdkp->device; | |
380 | ||
0b950672 | 381 | mutex_lock(&sd_ref_mutex); |
ee959b00 | 382 | put_device(&sdkp->dev); |
1da177e4 | 383 | scsi_device_put(sdev); |
0b950672 | 384 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
385 | } |
386 | ||
35e1a5d9 MP |
387 | static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif) |
388 | { | |
389 | unsigned int prot_op = SCSI_PROT_NORMAL; | |
390 | unsigned int dix = scsi_prot_sg_count(scmd); | |
391 | ||
392 | if (scmd->sc_data_direction == DMA_FROM_DEVICE) { | |
393 | if (dif && dix) | |
394 | prot_op = SCSI_PROT_READ_PASS; | |
395 | else if (dif && !dix) | |
396 | prot_op = SCSI_PROT_READ_STRIP; | |
397 | else if (!dif && dix) | |
398 | prot_op = SCSI_PROT_READ_INSERT; | |
399 | } else { | |
400 | if (dif && dix) | |
401 | prot_op = SCSI_PROT_WRITE_PASS; | |
402 | else if (dif && !dix) | |
403 | prot_op = SCSI_PROT_WRITE_INSERT; | |
404 | else if (!dif && dix) | |
405 | prot_op = SCSI_PROT_WRITE_STRIP; | |
406 | } | |
407 | ||
408 | scsi_set_prot_op(scmd, prot_op); | |
409 | scsi_set_prot_type(scmd, dif); | |
410 | } | |
411 | ||
e339c1a7 MP |
412 | /** |
413 | * sd_prepare_discard - unmap blocks on thinly provisioned device | |
414 | * @rq: Request to prepare | |
415 | * | |
416 | * Will issue either UNMAP or WRITE SAME(16) depending on preference | |
417 | * indicated by target device. | |
418 | **/ | |
419 | static int sd_prepare_discard(struct request *rq) | |
420 | { | |
421 | struct scsi_disk *sdkp = scsi_disk(rq->rq_disk); | |
422 | struct bio *bio = rq->bio; | |
423 | sector_t sector = bio->bi_sector; | |
424 | unsigned int num = bio_sectors(bio); | |
425 | ||
426 | if (sdkp->device->sector_size == 4096) { | |
427 | sector >>= 3; | |
428 | num >>= 3; | |
429 | } | |
430 | ||
431 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
432 | rq->timeout = SD_TIMEOUT; | |
433 | ||
434 | memset(rq->cmd, 0, rq->cmd_len); | |
435 | ||
436 | if (sdkp->unmap) { | |
437 | char *buf = kmap_atomic(bio_page(bio), KM_USER0); | |
438 | ||
439 | rq->cmd[0] = UNMAP; | |
440 | rq->cmd[8] = 24; | |
441 | rq->cmd_len = 10; | |
442 | ||
443 | /* Ensure that data length matches payload */ | |
444 | rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24; | |
445 | ||
446 | put_unaligned_be16(6 + 16, &buf[0]); | |
447 | put_unaligned_be16(16, &buf[2]); | |
448 | put_unaligned_be64(sector, &buf[8]); | |
449 | put_unaligned_be32(num, &buf[16]); | |
450 | ||
451 | kunmap_atomic(buf, KM_USER0); | |
452 | } else { | |
453 | rq->cmd[0] = WRITE_SAME_16; | |
454 | rq->cmd[1] = 0x8; /* UNMAP */ | |
455 | put_unaligned_be64(sector, &rq->cmd[2]); | |
456 | put_unaligned_be32(num, &rq->cmd[10]); | |
457 | rq->cmd_len = 16; | |
458 | } | |
459 | ||
460 | return BLKPREP_OK; | |
461 | } | |
462 | ||
1da177e4 LT |
463 | /** |
464 | * sd_init_command - build a scsi (read or write) command from | |
465 | * information in the request structure. | |
466 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
467 | * contains request and into which the scsi command is written | |
468 | * | |
469 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
470 | **/ | |
7f9a6bc4 | 471 | static int sd_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 472 | { |
7f9a6bc4 JB |
473 | struct scsi_cmnd *SCpnt; |
474 | struct scsi_device *sdp = q->queuedata; | |
776b23a0 | 475 | struct gendisk *disk = rq->rq_disk; |
af55ff67 | 476 | struct scsi_disk *sdkp; |
83096ebf | 477 | sector_t block = blk_rq_pos(rq); |
18351070 | 478 | sector_t threshold; |
83096ebf | 479 | unsigned int this_count = blk_rq_sectors(rq); |
bd623e79 | 480 | int ret, host_dif; |
4e7392ec | 481 | unsigned char protect; |
7f9a6bc4 | 482 | |
e339c1a7 MP |
483 | /* |
484 | * Discard request come in as REQ_TYPE_FS but we turn them into | |
485 | * block PC requests to make life easier. | |
486 | */ | |
487 | if (blk_discard_rq(rq)) | |
488 | ret = sd_prepare_discard(rq); | |
489 | ||
7f9a6bc4 JB |
490 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { |
491 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); | |
492 | goto out; | |
493 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
494 | ret = BLKPREP_KILL; | |
495 | goto out; | |
496 | } | |
497 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
498 | if (ret != BLKPREP_OK) | |
499 | goto out; | |
500 | SCpnt = rq->special; | |
af55ff67 | 501 | sdkp = scsi_disk(disk); |
7f9a6bc4 JB |
502 | |
503 | /* from here on until we're complete, any goto out | |
504 | * is used for a killable error condition */ | |
505 | ret = BLKPREP_KILL; | |
1da177e4 | 506 | |
fa0d34be MP |
507 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
508 | "sd_init_command: block=%llu, " | |
509 | "count=%d\n", | |
510 | (unsigned long long)block, | |
511 | this_count)); | |
1da177e4 LT |
512 | |
513 | if (!sdp || !scsi_device_online(sdp) || | |
83096ebf | 514 | block + blk_rq_sectors(rq) > get_capacity(disk)) { |
fa0d34be | 515 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
83096ebf TH |
516 | "Finishing %u sectors\n", |
517 | blk_rq_sectors(rq))); | |
fa0d34be MP |
518 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
519 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 520 | goto out; |
1da177e4 LT |
521 | } |
522 | ||
523 | if (sdp->changed) { | |
524 | /* | |
525 | * quietly refuse to do anything to a changed disc until | |
526 | * the changed bit has been reset | |
527 | */ | |
528 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
7f9a6bc4 | 529 | goto out; |
1da177e4 | 530 | } |
7f9a6bc4 | 531 | |
a0899d4d | 532 | /* |
18351070 LT |
533 | * Some SD card readers can't handle multi-sector accesses which touch |
534 | * the last one or two hardware sectors. Split accesses as needed. | |
a0899d4d | 535 | */ |
18351070 LT |
536 | threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * |
537 | (sdp->sector_size / 512); | |
538 | ||
539 | if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { | |
540 | if (block < threshold) { | |
541 | /* Access up to the threshold but not beyond */ | |
542 | this_count = threshold - block; | |
543 | } else { | |
544 | /* Access only a single hardware sector */ | |
545 | this_count = sdp->sector_size / 512; | |
546 | } | |
547 | } | |
a0899d4d | 548 | |
fa0d34be MP |
549 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
550 | (unsigned long long)block)); | |
1da177e4 LT |
551 | |
552 | /* | |
553 | * If we have a 1K hardware sectorsize, prevent access to single | |
554 | * 512 byte sectors. In theory we could handle this - in fact | |
555 | * the scsi cdrom driver must be able to handle this because | |
556 | * we typically use 1K blocksizes, and cdroms typically have | |
557 | * 2K hardware sectorsizes. Of course, things are simpler | |
558 | * with the cdrom, since it is read-only. For performance | |
559 | * reasons, the filesystems should be able to handle this | |
560 | * and not force the scsi disk driver to use bounce buffers | |
561 | * for this. | |
562 | */ | |
563 | if (sdp->sector_size == 1024) { | |
83096ebf | 564 | if ((block & 1) || (blk_rq_sectors(rq) & 1)) { |
e73aec82 MP |
565 | scmd_printk(KERN_ERR, SCpnt, |
566 | "Bad block number requested\n"); | |
7f9a6bc4 | 567 | goto out; |
1da177e4 LT |
568 | } else { |
569 | block = block >> 1; | |
570 | this_count = this_count >> 1; | |
571 | } | |
572 | } | |
573 | if (sdp->sector_size == 2048) { | |
83096ebf | 574 | if ((block & 3) || (blk_rq_sectors(rq) & 3)) { |
e73aec82 MP |
575 | scmd_printk(KERN_ERR, SCpnt, |
576 | "Bad block number requested\n"); | |
7f9a6bc4 | 577 | goto out; |
1da177e4 LT |
578 | } else { |
579 | block = block >> 2; | |
580 | this_count = this_count >> 2; | |
581 | } | |
582 | } | |
583 | if (sdp->sector_size == 4096) { | |
83096ebf | 584 | if ((block & 7) || (blk_rq_sectors(rq) & 7)) { |
e73aec82 MP |
585 | scmd_printk(KERN_ERR, SCpnt, |
586 | "Bad block number requested\n"); | |
7f9a6bc4 | 587 | goto out; |
1da177e4 LT |
588 | } else { |
589 | block = block >> 3; | |
590 | this_count = this_count >> 3; | |
591 | } | |
592 | } | |
593 | if (rq_data_dir(rq) == WRITE) { | |
594 | if (!sdp->writeable) { | |
7f9a6bc4 | 595 | goto out; |
1da177e4 LT |
596 | } |
597 | SCpnt->cmnd[0] = WRITE_6; | |
598 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
af55ff67 MP |
599 | |
600 | if (blk_integrity_rq(rq) && | |
601 | sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) | |
602 | goto out; | |
603 | ||
1da177e4 LT |
604 | } else if (rq_data_dir(rq) == READ) { |
605 | SCpnt->cmnd[0] = READ_6; | |
606 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
607 | } else { | |
e73aec82 | 608 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
7f9a6bc4 | 609 | goto out; |
1da177e4 LT |
610 | } |
611 | ||
fa0d34be | 612 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
83096ebf | 613 | "%s %d/%u 512 byte blocks.\n", |
fa0d34be MP |
614 | (rq_data_dir(rq) == WRITE) ? |
615 | "writing" : "reading", this_count, | |
83096ebf | 616 | blk_rq_sectors(rq))); |
1da177e4 | 617 | |
af55ff67 | 618 | /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ |
bd623e79 MP |
619 | host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); |
620 | if (host_dif) | |
4e7392ec | 621 | protect = 1 << 5; |
af55ff67 | 622 | else |
4e7392ec MP |
623 | protect = 0; |
624 | ||
625 | if (host_dif == SD_DIF_TYPE2_PROTECTION) { | |
626 | SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC); | |
627 | ||
628 | if (unlikely(SCpnt->cmnd == NULL)) { | |
629 | ret = BLKPREP_DEFER; | |
630 | goto out; | |
631 | } | |
af55ff67 | 632 | |
4e7392ec MP |
633 | SCpnt->cmd_len = SD_EXT_CDB_SIZE; |
634 | memset(SCpnt->cmnd, 0, SCpnt->cmd_len); | |
635 | SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD; | |
636 | SCpnt->cmnd[7] = 0x18; | |
637 | SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32; | |
638 | SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0); | |
639 | ||
640 | /* LBA */ | |
641 | SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; | |
642 | SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
643 | SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
644 | SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
645 | SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff; | |
646 | SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff; | |
647 | SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff; | |
648 | SCpnt->cmnd[19] = (unsigned char) block & 0xff; | |
649 | ||
650 | /* Expected Indirect LBA */ | |
651 | SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff; | |
652 | SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff; | |
653 | SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff; | |
654 | SCpnt->cmnd[23] = (unsigned char) block & 0xff; | |
655 | ||
656 | /* Transfer length */ | |
657 | SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff; | |
658 | SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff; | |
659 | SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff; | |
660 | SCpnt->cmnd[31] = (unsigned char) this_count & 0xff; | |
661 | } else if (block > 0xffffffff) { | |
1da177e4 | 662 | SCpnt->cmnd[0] += READ_16 - READ_6; |
4e7392ec | 663 | SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); |
1da177e4 LT |
664 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
665 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
666 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
667 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
668 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
669 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
670 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
671 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
672 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
673 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
674 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
675 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
676 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
677 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
af55ff67 | 678 | scsi_device_protection(SCpnt->device) || |
1da177e4 LT |
679 | SCpnt->device->use_10_for_rw) { |
680 | if (this_count > 0xffff) | |
681 | this_count = 0xffff; | |
682 | ||
683 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
4e7392ec | 684 | SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0); |
1da177e4 LT |
685 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
686 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
687 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
688 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
689 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
690 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
691 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
692 | } else { | |
007365ad TH |
693 | if (unlikely(blk_fua_rq(rq))) { |
694 | /* | |
695 | * This happens only if this drive failed | |
696 | * 10byte rw command with ILLEGAL_REQUEST | |
697 | * during operation and thus turned off | |
698 | * use_10_for_rw. | |
699 | */ | |
e73aec82 MP |
700 | scmd_printk(KERN_ERR, SCpnt, |
701 | "FUA write on READ/WRITE(6) drive\n"); | |
7f9a6bc4 | 702 | goto out; |
007365ad TH |
703 | } |
704 | ||
1da177e4 LT |
705 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
706 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
707 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
708 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
709 | SCpnt->cmnd[5] = 0; | |
710 | } | |
30b0c37b | 711 | SCpnt->sdb.length = this_count * sdp->sector_size; |
1da177e4 | 712 | |
af55ff67 | 713 | /* If DIF or DIX is enabled, tell HBA how to handle request */ |
bd623e79 | 714 | if (host_dif || scsi_prot_sg_count(SCpnt)) |
35e1a5d9 | 715 | sd_prot_op(SCpnt, host_dif); |
af55ff67 | 716 | |
1da177e4 LT |
717 | /* |
718 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
719 | * host adapter, it's safe to assume that we can at least transfer | |
720 | * this many bytes between each connect / disconnect. | |
721 | */ | |
722 | SCpnt->transfersize = sdp->sector_size; | |
723 | SCpnt->underflow = this_count << 9; | |
724 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 | 725 | |
1da177e4 LT |
726 | /* |
727 | * This indicates that the command is ready from our end to be | |
728 | * queued. | |
729 | */ | |
7f9a6bc4 JB |
730 | ret = BLKPREP_OK; |
731 | out: | |
732 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
733 | } |
734 | ||
735 | /** | |
736 | * sd_open - open a scsi disk device | |
737 | * @inode: only i_rdev member may be used | |
738 | * @filp: only f_mode and f_flags may be used | |
739 | * | |
740 | * Returns 0 if successful. Returns a negated errno value in case | |
741 | * of error. | |
742 | * | |
743 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
744 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
745 | * In the latter case @inode and @filp carry an abridged amount | |
746 | * of information as noted above. | |
747 | **/ | |
0338e291 | 748 | static int sd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 749 | { |
0338e291 | 750 | struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); |
1da177e4 LT |
751 | struct scsi_device *sdev; |
752 | int retval; | |
753 | ||
0338e291 | 754 | if (!sdkp) |
1da177e4 LT |
755 | return -ENXIO; |
756 | ||
fa0d34be | 757 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1da177e4 LT |
758 | |
759 | sdev = sdkp->device; | |
760 | ||
761 | /* | |
762 | * If the device is in error recovery, wait until it is done. | |
763 | * If the device is offline, then disallow any access to it. | |
764 | */ | |
765 | retval = -ENXIO; | |
766 | if (!scsi_block_when_processing_errors(sdev)) | |
767 | goto error_out; | |
768 | ||
769 | if (sdev->removable || sdkp->write_prot) | |
0338e291 | 770 | check_disk_change(bdev); |
1da177e4 LT |
771 | |
772 | /* | |
773 | * If the drive is empty, just let the open fail. | |
774 | */ | |
775 | retval = -ENOMEDIUM; | |
0338e291 | 776 | if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) |
1da177e4 LT |
777 | goto error_out; |
778 | ||
779 | /* | |
780 | * If the device has the write protect tab set, have the open fail | |
781 | * if the user expects to be able to write to the thing. | |
782 | */ | |
783 | retval = -EROFS; | |
0338e291 | 784 | if (sdkp->write_prot && (mode & FMODE_WRITE)) |
1da177e4 LT |
785 | goto error_out; |
786 | ||
787 | /* | |
788 | * It is possible that the disk changing stuff resulted in | |
789 | * the device being taken offline. If this is the case, | |
790 | * report this to the user, and don't pretend that the | |
791 | * open actually succeeded. | |
792 | */ | |
793 | retval = -ENXIO; | |
794 | if (!scsi_device_online(sdev)) | |
795 | goto error_out; | |
796 | ||
797 | if (!sdkp->openers++ && sdev->removable) { | |
798 | if (scsi_block_when_processing_errors(sdev)) | |
799 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
800 | } | |
801 | ||
802 | return 0; | |
803 | ||
804 | error_out: | |
805 | scsi_disk_put(sdkp); | |
806 | return retval; | |
807 | } | |
808 | ||
809 | /** | |
810 | * sd_release - invoked when the (last) close(2) is called on this | |
811 | * scsi disk. | |
812 | * @inode: only i_rdev member may be used | |
813 | * @filp: only f_mode and f_flags may be used | |
814 | * | |
815 | * Returns 0. | |
816 | * | |
817 | * Note: may block (uninterruptible) if error recovery is underway | |
818 | * on this disk. | |
819 | **/ | |
0338e291 | 820 | static int sd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 821 | { |
1da177e4 LT |
822 | struct scsi_disk *sdkp = scsi_disk(disk); |
823 | struct scsi_device *sdev = sdkp->device; | |
824 | ||
56937f7b | 825 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); |
1da177e4 LT |
826 | |
827 | if (!--sdkp->openers && sdev->removable) { | |
828 | if (scsi_block_when_processing_errors(sdev)) | |
829 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
830 | } | |
831 | ||
832 | /* | |
833 | * XXX and what if there are packets in flight and this close() | |
834 | * XXX is followed by a "rmmod sd_mod"? | |
835 | */ | |
836 | scsi_disk_put(sdkp); | |
837 | return 0; | |
838 | } | |
839 | ||
a885c8c4 | 840 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
841 | { |
842 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
843 | struct scsi_device *sdp = sdkp->device; | |
844 | struct Scsi_Host *host = sdp->host; | |
845 | int diskinfo[4]; | |
846 | ||
847 | /* default to most commonly used values */ | |
848 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
849 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
850 | diskinfo[2] = sdkp->capacity >> 11; | |
851 | ||
852 | /* override with calculated, extended default, or driver values */ | |
853 | if (host->hostt->bios_param) | |
854 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
855 | else | |
856 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
857 | ||
a885c8c4 CH |
858 | geo->heads = diskinfo[0]; |
859 | geo->sectors = diskinfo[1]; | |
860 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
861 | return 0; |
862 | } | |
863 | ||
864 | /** | |
865 | * sd_ioctl - process an ioctl | |
866 | * @inode: only i_rdev/i_bdev members may be used | |
867 | * @filp: only f_mode and f_flags may be used | |
868 | * @cmd: ioctl command number | |
869 | * @arg: this is third argument given to ioctl(2) system call. | |
870 | * Often contains a pointer. | |
871 | * | |
872 | * Returns 0 if successful (some ioctls return postive numbers on | |
873 | * success as well). Returns a negated errno value in case of error. | |
874 | * | |
875 | * Note: most ioctls are forward onto the block subsystem or further | |
3a4fa0a2 | 876 | * down in the scsi subsystem. |
1da177e4 | 877 | **/ |
0338e291 | 878 | static int sd_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
879 | unsigned int cmd, unsigned long arg) |
880 | { | |
1da177e4 LT |
881 | struct gendisk *disk = bdev->bd_disk; |
882 | struct scsi_device *sdp = scsi_disk(disk)->device; | |
883 | void __user *p = (void __user *)arg; | |
884 | int error; | |
885 | ||
886 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", | |
887 | disk->disk_name, cmd)); | |
888 | ||
889 | /* | |
890 | * If we are in the middle of error recovery, don't let anyone | |
891 | * else try and use this device. Also, if error recovery fails, it | |
892 | * may try and take the device offline, in which case all further | |
893 | * access to the device is prohibited. | |
894 | */ | |
83ff6fe8 | 895 | error = scsi_nonblockable_ioctl(sdp, cmd, p, |
fd4ce1ac | 896 | (mode & FMODE_NDELAY) != 0); |
1da177e4 LT |
897 | if (!scsi_block_when_processing_errors(sdp) || !error) |
898 | return error; | |
899 | ||
1da177e4 LT |
900 | /* |
901 | * Send SCSI addressing ioctls directly to mid level, send other | |
902 | * ioctls to block level and then onto mid level if they can't be | |
903 | * resolved. | |
904 | */ | |
905 | switch (cmd) { | |
906 | case SCSI_IOCTL_GET_IDLUN: | |
907 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
908 | return scsi_ioctl(sdp, cmd, p); | |
909 | default: | |
0338e291 | 910 | error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); |
1da177e4 LT |
911 | if (error != -ENOTTY) |
912 | return error; | |
913 | } | |
914 | return scsi_ioctl(sdp, cmd, p); | |
915 | } | |
916 | ||
917 | static void set_media_not_present(struct scsi_disk *sdkp) | |
918 | { | |
919 | sdkp->media_present = 0; | |
920 | sdkp->capacity = 0; | |
921 | sdkp->device->changed = 1; | |
922 | } | |
923 | ||
924 | /** | |
925 | * sd_media_changed - check if our medium changed | |
926 | * @disk: kernel device descriptor | |
927 | * | |
928 | * Returns 0 if not applicable or no change; 1 if change | |
929 | * | |
930 | * Note: this function is invoked from the block subsystem. | |
931 | **/ | |
932 | static int sd_media_changed(struct gendisk *disk) | |
933 | { | |
934 | struct scsi_disk *sdkp = scsi_disk(disk); | |
935 | struct scsi_device *sdp = sdkp->device; | |
001aac25 | 936 | struct scsi_sense_hdr *sshdr = NULL; |
1da177e4 LT |
937 | int retval; |
938 | ||
fa0d34be | 939 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); |
1da177e4 LT |
940 | |
941 | if (!sdp->removable) | |
942 | return 0; | |
943 | ||
944 | /* | |
945 | * If the device is offline, don't send any commands - just pretend as | |
946 | * if the command failed. If the device ever comes back online, we | |
947 | * can deal with it then. It is only because of unrecoverable errors | |
948 | * that we would ever take a device offline in the first place. | |
949 | */ | |
285e9670 KS |
950 | if (!scsi_device_online(sdp)) { |
951 | set_media_not_present(sdkp); | |
952 | retval = 1; | |
953 | goto out; | |
954 | } | |
1da177e4 LT |
955 | |
956 | /* | |
957 | * Using TEST_UNIT_READY enables differentiation between drive with | |
958 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
959 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
960 | * | |
961 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
962 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
963 | * sd_revalidate() is called. | |
964 | */ | |
965 | retval = -ENODEV; | |
285e9670 | 966 | |
001aac25 JB |
967 | if (scsi_block_when_processing_errors(sdp)) { |
968 | sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); | |
969 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, | |
970 | sshdr); | |
971 | } | |
1da177e4 LT |
972 | |
973 | /* | |
974 | * Unable to test, unit probably not ready. This usually | |
975 | * means there is no disc in the drive. Mark as changed, | |
976 | * and we will figure it out later once the drive is | |
977 | * available again. | |
978 | */ | |
001aac25 JB |
979 | if (retval || (scsi_sense_valid(sshdr) && |
980 | /* 0x3a is medium not present */ | |
981 | sshdr->asc == 0x3a)) { | |
285e9670 KS |
982 | set_media_not_present(sdkp); |
983 | retval = 1; | |
984 | goto out; | |
985 | } | |
1da177e4 LT |
986 | |
987 | /* | |
988 | * For removable scsi disk we have to recognise the presence | |
989 | * of a disk in the drive. This is kept in the struct scsi_disk | |
990 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
991 | */ | |
992 | sdkp->media_present = 1; | |
993 | ||
994 | retval = sdp->changed; | |
995 | sdp->changed = 0; | |
285e9670 KS |
996 | out: |
997 | if (retval != sdkp->previous_state) | |
998 | sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); | |
999 | sdkp->previous_state = retval; | |
001aac25 | 1000 | kfree(sshdr); |
1da177e4 | 1001 | return retval; |
1da177e4 LT |
1002 | } |
1003 | ||
e73aec82 | 1004 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1da177e4 | 1005 | { |
1da177e4 | 1006 | int retries, res; |
e73aec82 | 1007 | struct scsi_device *sdp = sdkp->device; |
ea73a9f2 | 1008 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
1009 | |
1010 | if (!scsi_device_online(sdp)) | |
1011 | return -ENODEV; | |
1012 | ||
1da177e4 | 1013 | |
1da177e4 LT |
1014 | for (retries = 3; retries > 0; --retries) { |
1015 | unsigned char cmd[10] = { 0 }; | |
1016 | ||
1017 | cmd[0] = SYNCHRONIZE_CACHE; | |
1018 | /* | |
1019 | * Leave the rest of the command zero to indicate | |
1020 | * flush everything. | |
1021 | */ | |
ea73a9f2 | 1022 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
f4f4e47e | 1023 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
ea73a9f2 | 1024 | if (res == 0) |
1da177e4 LT |
1025 | break; |
1026 | } | |
1027 | ||
e73aec82 MP |
1028 | if (res) { |
1029 | sd_print_result(sdkp, res); | |
1030 | if (driver_byte(res) & DRIVER_SENSE) | |
1031 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1032 | } |
1033 | ||
3721050a TH |
1034 | if (res) |
1035 | return -EIO; | |
1036 | return 0; | |
1da177e4 LT |
1037 | } |
1038 | ||
165125e1 | 1039 | static void sd_prepare_flush(struct request_queue *q, struct request *rq) |
1da177e4 | 1040 | { |
4aff5e23 | 1041 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
c0ed79a3 | 1042 | rq->timeout = SD_TIMEOUT; |
c213e140 | 1043 | rq->retries = SD_MAX_RETRIES; |
c0ed79a3 | 1044 | rq->cmd[0] = SYNCHRONIZE_CACHE; |
461d4e90 | 1045 | rq->cmd_len = 10; |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | static void sd_rescan(struct device *dev) | |
1049 | { | |
39b7f1e2 AS |
1050 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1051 | ||
1052 | if (sdkp) { | |
f98a8cae | 1053 | revalidate_disk(sdkp->disk); |
39b7f1e2 AS |
1054 | scsi_disk_put(sdkp); |
1055 | } | |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | ||
1059 | #ifdef CONFIG_COMPAT | |
1060 | /* | |
1061 | * This gets directly called from VFS. When the ioctl | |
1062 | * is not recognized we go back to the other translation paths. | |
1063 | */ | |
0338e291 AV |
1064 | static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
1065 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 1066 | { |
0338e291 | 1067 | struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; |
1da177e4 LT |
1068 | |
1069 | /* | |
1070 | * If we are in the middle of error recovery, don't let anyone | |
1071 | * else try and use this device. Also, if error recovery fails, it | |
1072 | * may try and take the device offline, in which case all further | |
1073 | * access to the device is prohibited. | |
1074 | */ | |
1075 | if (!scsi_block_when_processing_errors(sdev)) | |
1076 | return -ENODEV; | |
1077 | ||
1078 | if (sdev->host->hostt->compat_ioctl) { | |
1079 | int ret; | |
1080 | ||
1081 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
1082 | ||
1083 | return ret; | |
1084 | } | |
1085 | ||
1086 | /* | |
1087 | * Let the static ioctl translation table take care of it. | |
1088 | */ | |
1089 | return -ENOIOCTLCMD; | |
1090 | } | |
1091 | #endif | |
1092 | ||
83d5cde4 | 1093 | static const struct block_device_operations sd_fops = { |
1da177e4 | 1094 | .owner = THIS_MODULE, |
0338e291 AV |
1095 | .open = sd_open, |
1096 | .release = sd_release, | |
1097 | .locked_ioctl = sd_ioctl, | |
a885c8c4 | 1098 | .getgeo = sd_getgeo, |
1da177e4 | 1099 | #ifdef CONFIG_COMPAT |
0338e291 | 1100 | .compat_ioctl = sd_compat_ioctl, |
1da177e4 LT |
1101 | #endif |
1102 | .media_changed = sd_media_changed, | |
1103 | .revalidate_disk = sd_revalidate_disk, | |
1104 | }; | |
1105 | ||
af55ff67 MP |
1106 | static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) |
1107 | { | |
83096ebf TH |
1108 | u64 start_lba = blk_rq_pos(scmd->request); |
1109 | u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); | |
af55ff67 MP |
1110 | u64 bad_lba; |
1111 | int info_valid; | |
1112 | ||
1113 | if (!blk_fs_request(scmd->request)) | |
1114 | return 0; | |
1115 | ||
1116 | info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, | |
1117 | SCSI_SENSE_BUFFERSIZE, | |
1118 | &bad_lba); | |
1119 | if (!info_valid) | |
1120 | return 0; | |
1121 | ||
1122 | if (scsi_bufflen(scmd) <= scmd->device->sector_size) | |
1123 | return 0; | |
1124 | ||
1125 | if (scmd->device->sector_size < 512) { | |
1126 | /* only legitimate sector_size here is 256 */ | |
1127 | start_lba <<= 1; | |
1128 | end_lba <<= 1; | |
1129 | } else { | |
1130 | /* be careful ... don't want any overflows */ | |
1131 | u64 factor = scmd->device->sector_size / 512; | |
1132 | do_div(start_lba, factor); | |
1133 | do_div(end_lba, factor); | |
1134 | } | |
1135 | ||
1136 | /* The bad lba was reported incorrectly, we have no idea where | |
1137 | * the error is. | |
1138 | */ | |
1139 | if (bad_lba < start_lba || bad_lba >= end_lba) | |
1140 | return 0; | |
1141 | ||
1142 | /* This computation should always be done in terms of | |
1143 | * the resolution of the device's medium. | |
1144 | */ | |
1145 | return (bad_lba - start_lba) * scmd->device->sector_size; | |
1146 | } | |
1147 | ||
1da177e4 | 1148 | /** |
7b3d9545 | 1149 | * sd_done - bottom half handler: called when the lower level |
1da177e4 LT |
1150 | * driver has completed (successfully or otherwise) a scsi command. |
1151 | * @SCpnt: mid-level's per command structure. | |
1152 | * | |
1153 | * Note: potentially run from within an ISR. Must not block. | |
1154 | **/ | |
7b3d9545 | 1155 | static int sd_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
1156 | { |
1157 | int result = SCpnt->result; | |
af55ff67 | 1158 | unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); |
1da177e4 | 1159 | struct scsi_sense_hdr sshdr; |
4e7392ec | 1160 | struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk); |
1da177e4 LT |
1161 | int sense_valid = 0; |
1162 | int sense_deferred = 0; | |
1da177e4 LT |
1163 | |
1164 | if (result) { | |
1165 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
1166 | if (sense_valid) | |
1167 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
1168 | } | |
1da177e4 | 1169 | #ifdef CONFIG_SCSI_LOGGING |
fa0d34be | 1170 | SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
1da177e4 | 1171 | if (sense_valid) { |
fa0d34be | 1172 | SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
7b3d9545 | 1173 | "sd_done: sb[respc,sk,asc," |
fa0d34be MP |
1174 | "ascq]=%x,%x,%x,%x\n", |
1175 | sshdr.response_code, | |
1176 | sshdr.sense_key, sshdr.asc, | |
1177 | sshdr.ascq)); | |
1da177e4 LT |
1178 | } |
1179 | #endif | |
03aba2f7 LT |
1180 | if (driver_byte(result) != DRIVER_SENSE && |
1181 | (!sense_valid || sense_deferred)) | |
1182 | goto out; | |
1183 | ||
1184 | switch (sshdr.sense_key) { | |
1185 | case HARDWARE_ERROR: | |
1186 | case MEDIUM_ERROR: | |
af55ff67 | 1187 | good_bytes = sd_completed_bytes(SCpnt); |
03aba2f7 LT |
1188 | break; |
1189 | case RECOVERED_ERROR: | |
af55ff67 MP |
1190 | good_bytes = scsi_bufflen(SCpnt); |
1191 | break; | |
10dab226 JW |
1192 | case NO_SENSE: |
1193 | /* This indicates a false check condition, so ignore it. An | |
1194 | * unknown amount of data was transferred so treat it as an | |
1195 | * error. | |
1196 | */ | |
1197 | scsi_print_sense("sd", SCpnt); | |
1198 | SCpnt->result = 0; | |
1199 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
1200 | break; | |
fa4698fc MP |
1201 | case ABORTED_COMMAND: /* DIF: Target detected corruption */ |
1202 | case ILLEGAL_REQUEST: /* DIX: Host detected corruption */ | |
1203 | if (sshdr.asc == 0x10) | |
af55ff67 | 1204 | good_bytes = sd_completed_bytes(SCpnt); |
03aba2f7 LT |
1205 | break; |
1206 | default: | |
1207 | break; | |
1da177e4 | 1208 | } |
03aba2f7 | 1209 | out: |
af55ff67 MP |
1210 | if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) |
1211 | sd_dif_complete(SCpnt, good_bytes); | |
1212 | ||
4e7392ec | 1213 | if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type) |
77c9cfc5 MP |
1214 | == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) { |
1215 | ||
1216 | /* We have to print a failed command here as the | |
1217 | * extended CDB gets freed before scsi_io_completion() | |
1218 | * is called. | |
1219 | */ | |
1220 | if (result) | |
1221 | scsi_print_command(SCpnt); | |
1222 | ||
4e7392ec | 1223 | mempool_free(SCpnt->cmnd, sd_cdb_pool); |
77c9cfc5 MP |
1224 | SCpnt->cmnd = NULL; |
1225 | SCpnt->cmd_len = 0; | |
1226 | } | |
4e7392ec | 1227 | |
7b3d9545 | 1228 | return good_bytes; |
1da177e4 LT |
1229 | } |
1230 | ||
ea73a9f2 JB |
1231 | static int media_not_present(struct scsi_disk *sdkp, |
1232 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1233 | { |
1da177e4 | 1234 | |
ea73a9f2 | 1235 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
1236 | return 0; |
1237 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
1238 | if (sshdr->sense_key != NOT_READY && |
1239 | sshdr->sense_key != UNIT_ATTENTION) | |
1240 | return 0; | |
1241 | if (sshdr->asc != 0x3A) /* medium not present */ | |
1242 | return 0; | |
1243 | ||
1da177e4 LT |
1244 | set_media_not_present(sdkp); |
1245 | return 1; | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * spinup disk - called only in sd_revalidate_disk() | |
1250 | */ | |
1251 | static void | |
e73aec82 | 1252 | sd_spinup_disk(struct scsi_disk *sdkp) |
ea73a9f2 | 1253 | { |
1da177e4 | 1254 | unsigned char cmd[10]; |
4451e472 | 1255 | unsigned long spintime_expire = 0; |
1da177e4 LT |
1256 | int retries, spintime; |
1257 | unsigned int the_result; | |
1258 | struct scsi_sense_hdr sshdr; | |
1259 | int sense_valid = 0; | |
1260 | ||
1261 | spintime = 0; | |
1262 | ||
1263 | /* Spin up drives, as required. Only do this at boot time */ | |
1264 | /* Spinup needs to be done for module loads too. */ | |
1265 | do { | |
1266 | retries = 0; | |
1267 | ||
1268 | do { | |
1269 | cmd[0] = TEST_UNIT_READY; | |
1270 | memset((void *) &cmd[1], 0, 9); | |
1271 | ||
ea73a9f2 JB |
1272 | the_result = scsi_execute_req(sdkp->device, cmd, |
1273 | DMA_NONE, NULL, 0, | |
1274 | &sshdr, SD_TIMEOUT, | |
f4f4e47e | 1275 | SD_MAX_RETRIES, NULL); |
1da177e4 | 1276 | |
b4d38e38 AS |
1277 | /* |
1278 | * If the drive has indicated to us that it | |
1279 | * doesn't have any media in it, don't bother | |
1280 | * with any more polling. | |
1281 | */ | |
1282 | if (media_not_present(sdkp, &sshdr)) | |
1283 | return; | |
1284 | ||
1da177e4 | 1285 | if (the_result) |
ea73a9f2 | 1286 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1287 | retries++; |
1288 | } while (retries < 3 && | |
1289 | (!scsi_status_is_good(the_result) || | |
1290 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1291 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1292 | ||
1da177e4 LT |
1293 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1294 | /* no sense, TUR either succeeded or failed | |
1295 | * with a status error */ | |
e73aec82 MP |
1296 | if(!spintime && !scsi_status_is_good(the_result)) { |
1297 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); | |
1298 | sd_print_result(sdkp, the_result); | |
1299 | } | |
1da177e4 LT |
1300 | break; |
1301 | } | |
1302 | ||
1303 | /* | |
1304 | * The device does not want the automatic start to be issued. | |
1305 | */ | |
33dd6f92 | 1306 | if (sdkp->device->no_start_on_add) |
1da177e4 | 1307 | break; |
1da177e4 | 1308 | |
33dd6f92 MW |
1309 | if (sense_valid && sshdr.sense_key == NOT_READY) { |
1310 | if (sshdr.asc == 4 && sshdr.ascq == 3) | |
1311 | break; /* manual intervention required */ | |
1312 | if (sshdr.asc == 4 && sshdr.ascq == 0xb) | |
1313 | break; /* standby */ | |
1314 | if (sshdr.asc == 4 && sshdr.ascq == 0xc) | |
1315 | break; /* unavailable */ | |
1316 | /* | |
1317 | * Issue command to spin up drive when not ready | |
1318 | */ | |
1da177e4 | 1319 | if (!spintime) { |
e73aec82 | 1320 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1da177e4 LT |
1321 | cmd[0] = START_STOP; |
1322 | cmd[1] = 1; /* Return immediately */ | |
1323 | memset((void *) &cmd[2], 0, 8); | |
1324 | cmd[4] = 1; /* Start spin cycle */ | |
d2886ea3 SR |
1325 | if (sdkp->device->start_stop_pwr_cond) |
1326 | cmd[4] |= 1 << 4; | |
ea73a9f2 JB |
1327 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1328 | NULL, 0, &sshdr, | |
f4f4e47e FT |
1329 | SD_TIMEOUT, SD_MAX_RETRIES, |
1330 | NULL); | |
4451e472 AS |
1331 | spintime_expire = jiffies + 100 * HZ; |
1332 | spintime = 1; | |
1da177e4 | 1333 | } |
1da177e4 LT |
1334 | /* Wait 1 second for next try */ |
1335 | msleep(1000); | |
1336 | printk("."); | |
4451e472 AS |
1337 | |
1338 | /* | |
1339 | * Wait for USB flash devices with slow firmware. | |
1340 | * Yes, this sense key/ASC combination shouldn't | |
1341 | * occur here. It's characteristic of these devices. | |
1342 | */ | |
1343 | } else if (sense_valid && | |
1344 | sshdr.sense_key == UNIT_ATTENTION && | |
1345 | sshdr.asc == 0x28) { | |
1346 | if (!spintime) { | |
1347 | spintime_expire = jiffies + 5 * HZ; | |
1348 | spintime = 1; | |
1349 | } | |
1350 | /* Wait 1 second for next try */ | |
1351 | msleep(1000); | |
1da177e4 LT |
1352 | } else { |
1353 | /* we don't understand the sense code, so it's | |
1354 | * probably pointless to loop */ | |
1355 | if(!spintime) { | |
e73aec82 MP |
1356 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1357 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1358 | } |
1359 | break; | |
1360 | } | |
1361 | ||
4451e472 | 1362 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1363 | |
1364 | if (spintime) { | |
1365 | if (scsi_status_is_good(the_result)) | |
1366 | printk("ready\n"); | |
1367 | else | |
1368 | printk("not responding...\n"); | |
1369 | } | |
1370 | } | |
1371 | ||
e0597d70 MP |
1372 | |
1373 | /* | |
1374 | * Determine whether disk supports Data Integrity Field. | |
1375 | */ | |
1376 | void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) | |
1377 | { | |
1378 | struct scsi_device *sdp = sdkp->device; | |
1379 | u8 type; | |
1380 | ||
1381 | if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) | |
35e1a5d9 MP |
1382 | return; |
1383 | ||
1384 | type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ | |
1385 | ||
1386 | if (type == sdkp->protection_type || !sdkp->first_scan) | |
1387 | return; | |
e0597d70 | 1388 | |
be922f47 MP |
1389 | sdkp->protection_type = type; |
1390 | ||
4e7392ec | 1391 | if (type > SD_DIF_TYPE3_PROTECTION) { |
35e1a5d9 MP |
1392 | sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \ |
1393 | "protection type %u. Disabling disk!\n", type); | |
1394 | sdkp->capacity = 0; | |
1395 | return; | |
e0597d70 MP |
1396 | } |
1397 | ||
35e1a5d9 MP |
1398 | if (scsi_host_dif_capable(sdp->host, type)) |
1399 | sd_printk(KERN_NOTICE, sdkp, | |
1400 | "Enabling DIF Type %u protection\n", type); | |
1401 | else | |
1402 | sd_printk(KERN_NOTICE, sdkp, | |
1403 | "Disabling DIF Type %u protection\n", type); | |
e0597d70 MP |
1404 | } |
1405 | ||
0da205e0 MW |
1406 | static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, |
1407 | struct scsi_sense_hdr *sshdr, int sense_valid, | |
1408 | int the_result) | |
1409 | { | |
1410 | sd_print_result(sdkp, the_result); | |
1411 | if (driver_byte(the_result) & DRIVER_SENSE) | |
1412 | sd_print_sense_hdr(sdkp, sshdr); | |
1413 | else | |
1414 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); | |
1415 | ||
1416 | /* | |
1417 | * Set dirty bit for removable devices if not ready - | |
1418 | * sometimes drives will not report this properly. | |
1419 | */ | |
1420 | if (sdp->removable && | |
1421 | sense_valid && sshdr->sense_key == NOT_READY) | |
1422 | sdp->changed = 1; | |
1423 | ||
1424 | /* | |
1425 | * We used to set media_present to 0 here to indicate no media | |
1426 | * in the drive, but some drives fail read capacity even with | |
1427 | * media present, so we can't do that. | |
1428 | */ | |
1429 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ | |
1430 | } | |
1431 | ||
1432 | #define RC16_LEN 32 | |
1433 | #if RC16_LEN > SD_BUF_SIZE | |
1434 | #error RC16_LEN must not be more than SD_BUF_SIZE | |
1435 | #endif | |
1436 | ||
3233ac19 JB |
1437 | #define READ_CAPACITY_RETRIES_ON_RESET 10 |
1438 | ||
0da205e0 MW |
1439 | static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, |
1440 | unsigned char *buffer) | |
ea73a9f2 | 1441 | { |
1da177e4 | 1442 | unsigned char cmd[16]; |
1da177e4 LT |
1443 | struct scsi_sense_hdr sshdr; |
1444 | int sense_valid = 0; | |
0da205e0 | 1445 | int the_result; |
3233ac19 | 1446 | int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; |
ea09bcc9 | 1447 | unsigned int alignment; |
0da205e0 MW |
1448 | unsigned long long lba; |
1449 | unsigned sector_size; | |
1da177e4 | 1450 | |
1da177e4 | 1451 | do { |
0da205e0 MW |
1452 | memset(cmd, 0, 16); |
1453 | cmd[0] = SERVICE_ACTION_IN; | |
1454 | cmd[1] = SAI_READ_CAPACITY_16; | |
1455 | cmd[13] = RC16_LEN; | |
1456 | memset(buffer, 0, RC16_LEN); | |
1457 | ||
ea73a9f2 | 1458 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
0da205e0 MW |
1459 | buffer, RC16_LEN, &sshdr, |
1460 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); | |
1da177e4 | 1461 | |
ea73a9f2 | 1462 | if (media_not_present(sdkp, &sshdr)) |
0da205e0 | 1463 | return -ENODEV; |
1da177e4 | 1464 | |
2b301307 | 1465 | if (the_result) { |
ea73a9f2 | 1466 | sense_valid = scsi_sense_valid(&sshdr); |
2b301307 MW |
1467 | if (sense_valid && |
1468 | sshdr.sense_key == ILLEGAL_REQUEST && | |
1469 | (sshdr.asc == 0x20 || sshdr.asc == 0x24) && | |
1470 | sshdr.ascq == 0x00) | |
1471 | /* Invalid Command Operation Code or | |
1472 | * Invalid Field in CDB, just retry | |
1473 | * silently with RC10 */ | |
1474 | return -EINVAL; | |
3233ac19 JB |
1475 | if (sense_valid && |
1476 | sshdr.sense_key == UNIT_ATTENTION && | |
1477 | sshdr.asc == 0x29 && sshdr.ascq == 0x00) | |
1478 | /* Device reset might occur several times, | |
1479 | * give it one more chance */ | |
1480 | if (--reset_retries > 0) | |
1481 | continue; | |
2b301307 | 1482 | } |
1da177e4 LT |
1483 | retries--; |
1484 | ||
1485 | } while (the_result && retries); | |
1486 | ||
0da205e0 | 1487 | if (the_result) { |
e73aec82 | 1488 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
0da205e0 MW |
1489 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); |
1490 | return -EINVAL; | |
1491 | } | |
e73aec82 | 1492 | |
8f76d151 DH |
1493 | sector_size = get_unaligned_be32(&buffer[8]); |
1494 | lba = get_unaligned_be64(&buffer[0]); | |
0da205e0 MW |
1495 | |
1496 | sd_read_protection_type(sdkp, buffer); | |
1497 | ||
1498 | if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { | |
1499 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " | |
1500 | "kernel compiled with support for large block " | |
1501 | "devices.\n"); | |
1502 | sdkp->capacity = 0; | |
1503 | return -EOVERFLOW; | |
1504 | } | |
1505 | ||
ea09bcc9 MP |
1506 | /* Logical blocks per physical block exponent */ |
1507 | sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; | |
1508 | ||
1509 | /* Lowest aligned logical block */ | |
1510 | alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; | |
1511 | blk_queue_alignment_offset(sdp->request_queue, alignment); | |
1512 | if (alignment && sdkp->first_scan) | |
1513 | sd_printk(KERN_NOTICE, sdkp, | |
1514 | "physical block alignment offset: %u\n", alignment); | |
1515 | ||
e339c1a7 MP |
1516 | if (buffer[14] & 0x80) { /* TPE */ |
1517 | struct request_queue *q = sdp->request_queue; | |
1518 | ||
1519 | sdkp->thin_provisioning = 1; | |
1520 | q->limits.discard_granularity = sdkp->hw_sector_size; | |
1521 | q->limits.max_discard_sectors = 0xffffffff; | |
1522 | ||
1523 | if (buffer[14] & 0x40) /* TPRZ */ | |
1524 | q->limits.discard_zeroes_data = 1; | |
1525 | ||
1526 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); | |
1527 | } | |
1528 | ||
0da205e0 MW |
1529 | sdkp->capacity = lba + 1; |
1530 | return sector_size; | |
1531 | } | |
1532 | ||
1533 | static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, | |
1534 | unsigned char *buffer) | |
1535 | { | |
1536 | unsigned char cmd[16]; | |
1537 | struct scsi_sense_hdr sshdr; | |
1538 | int sense_valid = 0; | |
1539 | int the_result; | |
3233ac19 | 1540 | int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; |
0da205e0 MW |
1541 | sector_t lba; |
1542 | unsigned sector_size; | |
1543 | ||
1544 | do { | |
1545 | cmd[0] = READ_CAPACITY; | |
1546 | memset(&cmd[1], 0, 9); | |
1547 | memset(buffer, 0, 8); | |
1548 | ||
1549 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, | |
1550 | buffer, 8, &sshdr, | |
1551 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); | |
1552 | ||
1553 | if (media_not_present(sdkp, &sshdr)) | |
1554 | return -ENODEV; | |
1555 | ||
3233ac19 | 1556 | if (the_result) { |
0da205e0 | 1557 | sense_valid = scsi_sense_valid(&sshdr); |
3233ac19 JB |
1558 | if (sense_valid && |
1559 | sshdr.sense_key == UNIT_ATTENTION && | |
1560 | sshdr.asc == 0x29 && sshdr.ascq == 0x00) | |
1561 | /* Device reset might occur several times, | |
1562 | * give it one more chance */ | |
1563 | if (--reset_retries > 0) | |
1564 | continue; | |
1565 | } | |
0da205e0 MW |
1566 | retries--; |
1567 | ||
1568 | } while (the_result && retries); | |
1569 | ||
1570 | if (the_result) { | |
1571 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); | |
1572 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); | |
1573 | return -EINVAL; | |
1574 | } | |
1575 | ||
8f76d151 DH |
1576 | sector_size = get_unaligned_be32(&buffer[4]); |
1577 | lba = get_unaligned_be32(&buffer[0]); | |
0da205e0 MW |
1578 | |
1579 | if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { | |
1580 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " | |
1581 | "kernel compiled with support for large block " | |
1582 | "devices.\n"); | |
1583 | sdkp->capacity = 0; | |
1584 | return -EOVERFLOW; | |
1585 | } | |
1586 | ||
1587 | sdkp->capacity = lba + 1; | |
ea09bcc9 | 1588 | sdkp->hw_sector_size = sector_size; |
0da205e0 MW |
1589 | return sector_size; |
1590 | } | |
1591 | ||
2b301307 MW |
1592 | static int sd_try_rc16_first(struct scsi_device *sdp) |
1593 | { | |
f87146bb HR |
1594 | if (sdp->host->max_cmd_len < 16) |
1595 | return 0; | |
2b301307 MW |
1596 | if (sdp->scsi_level > SCSI_SPC_2) |
1597 | return 1; | |
1598 | if (scsi_device_protection(sdp)) | |
1599 | return 1; | |
1600 | return 0; | |
1601 | } | |
1602 | ||
0da205e0 MW |
1603 | /* |
1604 | * read disk capacity | |
1605 | */ | |
1606 | static void | |
1607 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) | |
1608 | { | |
1609 | int sector_size; | |
1610 | struct scsi_device *sdp = sdkp->device; | |
70a9b873 | 1611 | sector_t old_capacity = sdkp->capacity; |
0da205e0 | 1612 | |
2b301307 | 1613 | if (sd_try_rc16_first(sdp)) { |
0da205e0 MW |
1614 | sector_size = read_capacity_16(sdkp, sdp, buffer); |
1615 | if (sector_size == -EOVERFLOW) | |
1da177e4 | 1616 | goto got_data; |
2b301307 MW |
1617 | if (sector_size == -ENODEV) |
1618 | return; | |
1619 | if (sector_size < 0) | |
1620 | sector_size = read_capacity_10(sdkp, sdp, buffer); | |
0da205e0 MW |
1621 | if (sector_size < 0) |
1622 | return; | |
1da177e4 | 1623 | } else { |
0da205e0 MW |
1624 | sector_size = read_capacity_10(sdkp, sdp, buffer); |
1625 | if (sector_size == -EOVERFLOW) | |
1626 | goto got_data; | |
1627 | if (sector_size < 0) | |
1628 | return; | |
1629 | if ((sizeof(sdkp->capacity) > 4) && | |
1630 | (sdkp->capacity > 0xffffffffULL)) { | |
1631 | int old_sector_size = sector_size; | |
1632 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " | |
1633 | "Trying to use READ CAPACITY(16).\n"); | |
1634 | sector_size = read_capacity_16(sdkp, sdp, buffer); | |
1635 | if (sector_size < 0) { | |
1636 | sd_printk(KERN_NOTICE, sdkp, | |
1637 | "Using 0xffffffff as device size\n"); | |
1638 | sdkp->capacity = 1 + (sector_t) 0xffffffff; | |
1639 | sector_size = old_sector_size; | |
1640 | goto got_data; | |
1641 | } | |
1642 | } | |
1643 | } | |
1da177e4 | 1644 | |
5c211caa AS |
1645 | /* Some devices are known to return the total number of blocks, |
1646 | * not the highest block number. Some devices have versions | |
1647 | * which do this and others which do not. Some devices we might | |
1648 | * suspect of doing this but we don't know for certain. | |
1649 | * | |
1650 | * If we know the reported capacity is wrong, decrement it. If | |
1651 | * we can only guess, then assume the number of blocks is even | |
1652 | * (usually true but not always) and err on the side of lowering | |
1653 | * the capacity. | |
1654 | */ | |
1655 | if (sdp->fix_capacity || | |
1656 | (sdp->guess_capacity && (sdkp->capacity & 0x01))) { | |
1657 | sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " | |
1658 | "from its reported value: %llu\n", | |
1659 | (unsigned long long) sdkp->capacity); | |
1da177e4 | 1660 | --sdkp->capacity; |
61bf54b7 ON |
1661 | } |
1662 | ||
1da177e4 LT |
1663 | got_data: |
1664 | if (sector_size == 0) { | |
1665 | sector_size = 512; | |
e73aec82 MP |
1666 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
1667 | "assuming 512.\n"); | |
1da177e4 LT |
1668 | } |
1669 | ||
1670 | if (sector_size != 512 && | |
1671 | sector_size != 1024 && | |
1672 | sector_size != 2048 && | |
1673 | sector_size != 4096 && | |
1674 | sector_size != 256) { | |
e73aec82 MP |
1675 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
1676 | sector_size); | |
1da177e4 LT |
1677 | /* |
1678 | * The user might want to re-format the drive with | |
1679 | * a supported sectorsize. Once this happens, it | |
1680 | * would be relatively trivial to set the thing up. | |
1681 | * For this reason, we leave the thing in the table. | |
1682 | */ | |
1683 | sdkp->capacity = 0; | |
1684 | /* | |
1685 | * set a bogus sector size so the normal read/write | |
1686 | * logic in the block layer will eventually refuse any | |
1687 | * request on this device without tripping over power | |
1688 | * of two sector size assumptions | |
1689 | */ | |
1690 | sector_size = 512; | |
1691 | } | |
e1defc4f | 1692 | blk_queue_logical_block_size(sdp->request_queue, sector_size); |
7404ad3b | 1693 | |
1da177e4 | 1694 | { |
7404ad3b | 1695 | char cap_str_2[10], cap_str_10[10]; |
520a2c27 | 1696 | u64 sz = (u64)sdkp->capacity << ilog2(sector_size); |
1da177e4 | 1697 | |
7404ad3b JB |
1698 | string_get_size(sz, STRING_UNITS_2, cap_str_2, |
1699 | sizeof(cap_str_2)); | |
1700 | string_get_size(sz, STRING_UNITS_10, cap_str_10, | |
1701 | sizeof(cap_str_10)); | |
1da177e4 | 1702 | |
ea09bcc9 | 1703 | if (sdkp->first_scan || old_capacity != sdkp->capacity) { |
70a9b873 | 1704 | sd_printk(KERN_NOTICE, sdkp, |
ea09bcc9 | 1705 | "%llu %d-byte logical blocks: (%s/%s)\n", |
70a9b873 MP |
1706 | (unsigned long long)sdkp->capacity, |
1707 | sector_size, cap_str_10, cap_str_2); | |
ea09bcc9 MP |
1708 | |
1709 | if (sdkp->hw_sector_size != sector_size) | |
1710 | sd_printk(KERN_NOTICE, sdkp, | |
1711 | "%u-byte physical blocks\n", | |
1712 | sdkp->hw_sector_size); | |
1713 | } | |
1da177e4 LT |
1714 | } |
1715 | ||
1716 | /* Rescale capacity to 512-byte units */ | |
1717 | if (sector_size == 4096) | |
1718 | sdkp->capacity <<= 3; | |
1719 | else if (sector_size == 2048) | |
1720 | sdkp->capacity <<= 2; | |
1721 | else if (sector_size == 1024) | |
1722 | sdkp->capacity <<= 1; | |
1723 | else if (sector_size == 256) | |
1724 | sdkp->capacity >>= 1; | |
1725 | ||
ea09bcc9 | 1726 | blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); |
1da177e4 LT |
1727 | sdkp->device->sector_size = sector_size; |
1728 | } | |
1729 | ||
1730 | /* called with buffer of length 512 */ | |
1731 | static inline int | |
ea73a9f2 JB |
1732 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1733 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1734 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1735 | { |
ea73a9f2 | 1736 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1737 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1738 | sshdr); |
1da177e4 LT |
1739 | } |
1740 | ||
1741 | /* | |
1742 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1743 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1744 | */ |
1745 | static void | |
e73aec82 | 1746 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1747 | { |
1da177e4 | 1748 | int res; |
ea73a9f2 | 1749 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1750 | struct scsi_mode_data data; |
70a9b873 | 1751 | int old_wp = sdkp->write_prot; |
1da177e4 LT |
1752 | |
1753 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1754 | if (sdp->skip_ms_page_3f) { |
e73aec82 | 1755 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
1da177e4 LT |
1756 | return; |
1757 | } | |
1758 | ||
ea73a9f2 JB |
1759 | if (sdp->use_192_bytes_for_3f) { |
1760 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1761 | } else { |
1762 | /* | |
1763 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1764 | * We have to start carefully: some devices hang if we ask | |
1765 | * for more than is available. | |
1766 | */ | |
ea73a9f2 | 1767 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1768 | |
1769 | /* | |
1770 | * Second attempt: ask for page 0 When only page 0 is | |
1771 | * implemented, a request for page 3F may return Sense Key | |
1772 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1773 | * CDB. | |
1774 | */ | |
1775 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1776 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1777 | |
1778 | /* | |
1779 | * Third attempt: ask 255 bytes, as we did earlier. | |
1780 | */ | |
1781 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1782 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1783 | &data, NULL); | |
1da177e4 LT |
1784 | } |
1785 | ||
1786 | if (!scsi_status_is_good(res)) { | |
e73aec82 MP |
1787 | sd_printk(KERN_WARNING, sdkp, |
1788 | "Test WP failed, assume Write Enabled\n"); | |
1da177e4 LT |
1789 | } else { |
1790 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1791 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
70a9b873 MP |
1792 | if (sdkp->first_scan || old_wp != sdkp->write_prot) { |
1793 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", | |
1794 | sdkp->write_prot ? "on" : "off"); | |
1795 | sd_printk(KERN_DEBUG, sdkp, | |
1796 | "Mode Sense: %02x %02x %02x %02x\n", | |
1797 | buffer[0], buffer[1], buffer[2], buffer[3]); | |
1798 | } | |
1da177e4 LT |
1799 | } |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1804 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1805 | */ |
1806 | static void | |
e73aec82 | 1807 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
631e8a13 | 1808 | { |
1da177e4 | 1809 | int len = 0, res; |
ea73a9f2 | 1810 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1811 | |
631e8a13 AV |
1812 | int dbd; |
1813 | int modepage; | |
1da177e4 LT |
1814 | struct scsi_mode_data data; |
1815 | struct scsi_sense_hdr sshdr; | |
70a9b873 MP |
1816 | int old_wce = sdkp->WCE; |
1817 | int old_rcd = sdkp->RCD; | |
1818 | int old_dpofua = sdkp->DPOFUA; | |
1da177e4 | 1819 | |
ea73a9f2 | 1820 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1821 | goto defaults; |
1822 | ||
ea73a9f2 | 1823 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1824 | modepage = 6; |
1825 | dbd = 8; | |
1826 | } else { | |
1827 | modepage = 8; | |
1828 | dbd = 0; | |
1829 | } | |
1830 | ||
1da177e4 | 1831 | /* cautiously ask */ |
ea73a9f2 | 1832 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1833 | |
1834 | if (!scsi_status_is_good(res)) | |
1835 | goto bad_sense; | |
1836 | ||
6d73c851 AV |
1837 | if (!data.header_length) { |
1838 | modepage = 6; | |
e73aec82 | 1839 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
6d73c851 AV |
1840 | } |
1841 | ||
1da177e4 LT |
1842 | /* that went OK, now ask for the proper length */ |
1843 | len = data.length; | |
1844 | ||
1845 | /* | |
1846 | * We're only interested in the first three bytes, actually. | |
1847 | * But the data cache page is defined for the first 20. | |
1848 | */ | |
1849 | if (len < 3) | |
1850 | goto bad_sense; | |
1851 | if (len > 20) | |
1852 | len = 20; | |
1853 | ||
1854 | /* Take headers and block descriptors into account */ | |
1855 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1856 | if (len > SD_BUF_SIZE) |
1857 | goto bad_sense; | |
1da177e4 LT |
1858 | |
1859 | /* Get the data */ | |
ea73a9f2 | 1860 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1861 | |
1862 | if (scsi_status_is_good(res)) { | |
631e8a13 | 1863 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1864 | |
48970800 | 1865 | if (offset >= SD_BUF_SIZE - 2) { |
e73aec82 | 1866 | sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); |
48970800 AV |
1867 | goto defaults; |
1868 | } | |
1869 | ||
631e8a13 | 1870 | if ((buffer[offset] & 0x3f) != modepage) { |
e73aec82 | 1871 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
631e8a13 AV |
1872 | goto defaults; |
1873 | } | |
1874 | ||
1875 | if (modepage == 8) { | |
1876 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1877 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1878 | } else { | |
1879 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1880 | sdkp->RCD = 0; | |
1881 | } | |
1da177e4 | 1882 | |
007365ad TH |
1883 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1884 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
e73aec82 MP |
1885 | sd_printk(KERN_NOTICE, sdkp, |
1886 | "Uses READ/WRITE(6), disabling FUA\n"); | |
007365ad TH |
1887 | sdkp->DPOFUA = 0; |
1888 | } | |
1889 | ||
70a9b873 MP |
1890 | if (sdkp->first_scan || old_wce != sdkp->WCE || |
1891 | old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) | |
1892 | sd_printk(KERN_NOTICE, sdkp, | |
1893 | "Write cache: %s, read cache: %s, %s\n", | |
1894 | sdkp->WCE ? "enabled" : "disabled", | |
1895 | sdkp->RCD ? "disabled" : "enabled", | |
1896 | sdkp->DPOFUA ? "supports DPO and FUA" | |
1897 | : "doesn't support DPO or FUA"); | |
1da177e4 LT |
1898 | |
1899 | return; | |
1900 | } | |
1901 | ||
1902 | bad_sense: | |
ea73a9f2 | 1903 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1904 | sshdr.sense_key == ILLEGAL_REQUEST && |
1905 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
e73aec82 MP |
1906 | /* Invalid field in CDB */ |
1907 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); | |
1da177e4 | 1908 | else |
e73aec82 | 1909 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
1da177e4 LT |
1910 | |
1911 | defaults: | |
e73aec82 | 1912 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); |
1da177e4 LT |
1913 | sdkp->WCE = 0; |
1914 | sdkp->RCD = 0; | |
48970800 | 1915 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1916 | } |
1917 | ||
e0597d70 MP |
1918 | /* |
1919 | * The ATO bit indicates whether the DIF application tag is available | |
1920 | * for use by the operating system. | |
1921 | */ | |
1922 | void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) | |
1923 | { | |
1924 | int res, offset; | |
1925 | struct scsi_device *sdp = sdkp->device; | |
1926 | struct scsi_mode_data data; | |
1927 | struct scsi_sense_hdr sshdr; | |
1928 | ||
1929 | if (sdp->type != TYPE_DISK) | |
1930 | return; | |
1931 | ||
1932 | if (sdkp->protection_type == 0) | |
1933 | return; | |
1934 | ||
1935 | res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, | |
1936 | SD_MAX_RETRIES, &data, &sshdr); | |
1937 | ||
1938 | if (!scsi_status_is_good(res) || !data.header_length || | |
1939 | data.length < 6) { | |
1940 | sd_printk(KERN_WARNING, sdkp, | |
1941 | "getting Control mode page failed, assume no ATO\n"); | |
1942 | ||
1943 | if (scsi_sense_valid(&sshdr)) | |
1944 | sd_print_sense_hdr(sdkp, &sshdr); | |
1945 | ||
1946 | return; | |
1947 | } | |
1948 | ||
1949 | offset = data.header_length + data.block_descriptor_length; | |
1950 | ||
1951 | if ((buffer[offset] & 0x3f) != 0x0a) { | |
1952 | sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); | |
1953 | return; | |
1954 | } | |
1955 | ||
1956 | if ((buffer[offset + 5] & 0x80) == 0) | |
1957 | return; | |
1958 | ||
1959 | sdkp->ATO = 1; | |
1960 | ||
1961 | return; | |
1962 | } | |
1963 | ||
d11b6916 MP |
1964 | /** |
1965 | * sd_read_block_limits - Query disk device for preferred I/O sizes. | |
1966 | * @disk: disk to query | |
1967 | */ | |
1968 | static void sd_read_block_limits(struct scsi_disk *sdkp) | |
1969 | { | |
e339c1a7 | 1970 | struct request_queue *q = sdkp->disk->queue; |
d11b6916 | 1971 | unsigned int sector_sz = sdkp->device->sector_size; |
bb2d3de1 | 1972 | const int vpd_len = 64; |
e3deec09 | 1973 | unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL); |
d11b6916 | 1974 | |
e3deec09 JB |
1975 | if (!buffer || |
1976 | /* Block Limits VPD */ | |
1977 | scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len)) | |
1978 | goto out; | |
d11b6916 MP |
1979 | |
1980 | blk_queue_io_min(sdkp->disk->queue, | |
1981 | get_unaligned_be16(&buffer[6]) * sector_sz); | |
1982 | blk_queue_io_opt(sdkp->disk->queue, | |
1983 | get_unaligned_be32(&buffer[12]) * sector_sz); | |
1984 | ||
e339c1a7 MP |
1985 | /* Thin provisioning enabled and page length indicates TP support */ |
1986 | if (sdkp->thin_provisioning && buffer[3] == 0x3c) { | |
1987 | unsigned int lba_count, desc_count, granularity; | |
1988 | ||
1989 | lba_count = get_unaligned_be32(&buffer[20]); | |
1990 | desc_count = get_unaligned_be32(&buffer[24]); | |
1991 | ||
1992 | if (lba_count) { | |
1993 | q->limits.max_discard_sectors = | |
1994 | lba_count * sector_sz >> 9; | |
1995 | ||
1996 | if (desc_count) | |
1997 | sdkp->unmap = 1; | |
1998 | } | |
1999 | ||
2000 | granularity = get_unaligned_be32(&buffer[28]); | |
2001 | ||
2002 | if (granularity) | |
2003 | q->limits.discard_granularity = granularity * sector_sz; | |
2004 | ||
2005 | if (buffer[32] & 0x80) | |
2006 | q->limits.discard_alignment = | |
2007 | get_unaligned_be32(&buffer[32]) & ~(1 << 31); | |
2008 | } | |
2009 | ||
e3deec09 | 2010 | out: |
d11b6916 MP |
2011 | kfree(buffer); |
2012 | } | |
2013 | ||
3821d768 MP |
2014 | /** |
2015 | * sd_read_block_characteristics - Query block dev. characteristics | |
2016 | * @disk: disk to query | |
2017 | */ | |
2018 | static void sd_read_block_characteristics(struct scsi_disk *sdkp) | |
2019 | { | |
e3deec09 | 2020 | unsigned char *buffer; |
3821d768 | 2021 | u16 rot; |
bb2d3de1 | 2022 | const int vpd_len = 64; |
3821d768 | 2023 | |
e3deec09 | 2024 | buffer = kmalloc(vpd_len, GFP_KERNEL); |
3821d768 | 2025 | |
e3deec09 JB |
2026 | if (!buffer || |
2027 | /* Block Device Characteristics VPD */ | |
2028 | scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len)) | |
2029 | goto out; | |
3821d768 MP |
2030 | |
2031 | rot = get_unaligned_be16(&buffer[4]); | |
2032 | ||
2033 | if (rot == 1) | |
2034 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); | |
2035 | ||
e3deec09 | 2036 | out: |
3821d768 MP |
2037 | kfree(buffer); |
2038 | } | |
2039 | ||
ffd4bc2a MP |
2040 | static int sd_try_extended_inquiry(struct scsi_device *sdp) |
2041 | { | |
2042 | /* | |
2043 | * Although VPD inquiries can go to SCSI-2 type devices, | |
2044 | * some USB ones crash on receiving them, and the pages | |
2045 | * we currently ask for are for SPC-3 and beyond | |
2046 | */ | |
2047 | if (sdp->scsi_level > SCSI_SPC_2) | |
2048 | return 1; | |
2049 | return 0; | |
2050 | } | |
2051 | ||
1da177e4 LT |
2052 | /** |
2053 | * sd_revalidate_disk - called the first time a new disk is seen, | |
2054 | * performs disk spin up, read_capacity, etc. | |
2055 | * @disk: struct gendisk we care about | |
2056 | **/ | |
2057 | static int sd_revalidate_disk(struct gendisk *disk) | |
2058 | { | |
2059 | struct scsi_disk *sdkp = scsi_disk(disk); | |
2060 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 2061 | unsigned char *buffer; |
461d4e90 | 2062 | unsigned ordered; |
1da177e4 | 2063 | |
fa0d34be MP |
2064 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
2065 | "sd_revalidate_disk\n")); | |
1da177e4 LT |
2066 | |
2067 | /* | |
2068 | * If the device is offline, don't try and read capacity or any | |
2069 | * of the other niceties. | |
2070 | */ | |
2071 | if (!scsi_device_online(sdp)) | |
2072 | goto out; | |
2073 | ||
a6123f14 | 2074 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); |
1da177e4 | 2075 | if (!buffer) { |
e73aec82 MP |
2076 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
2077 | "allocation failure.\n"); | |
ea73a9f2 | 2078 | goto out; |
1da177e4 LT |
2079 | } |
2080 | ||
e73aec82 | 2081 | sd_spinup_disk(sdkp); |
1da177e4 LT |
2082 | |
2083 | /* | |
2084 | * Without media there is no reason to ask; moreover, some devices | |
2085 | * react badly if we do. | |
2086 | */ | |
2087 | if (sdkp->media_present) { | |
e73aec82 | 2088 | sd_read_capacity(sdkp, buffer); |
ffd4bc2a MP |
2089 | |
2090 | if (sd_try_extended_inquiry(sdp)) { | |
2091 | sd_read_block_limits(sdkp); | |
2092 | sd_read_block_characteristics(sdkp); | |
2093 | } | |
2094 | ||
e73aec82 MP |
2095 | sd_read_write_protect_flag(sdkp, buffer); |
2096 | sd_read_cache_type(sdkp, buffer); | |
e0597d70 | 2097 | sd_read_app_tag_own(sdkp, buffer); |
1da177e4 | 2098 | } |
461d4e90 | 2099 | |
70a9b873 MP |
2100 | sdkp->first_scan = 0; |
2101 | ||
461d4e90 TH |
2102 | /* |
2103 | * We now have all cache related info, determine how we deal | |
2104 | * with ordered requests. Note that as the current SCSI | |
2105 | * dispatch function can alter request order, we cannot use | |
2106 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
2107 | */ | |
2108 | if (sdkp->WCE) | |
007365ad TH |
2109 | ordered = sdkp->DPOFUA |
2110 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
2111 | else |
2112 | ordered = QUEUE_ORDERED_DRAIN; | |
2113 | ||
2114 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
2115 | ||
1da177e4 LT |
2116 | set_capacity(disk, sdkp->capacity); |
2117 | kfree(buffer); | |
2118 | ||
1da177e4 LT |
2119 | out: |
2120 | return 0; | |
2121 | } | |
2122 | ||
3e1a7ff8 TH |
2123 | /** |
2124 | * sd_format_disk_name - format disk name | |
2125 | * @prefix: name prefix - ie. "sd" for SCSI disks | |
2126 | * @index: index of the disk to format name for | |
2127 | * @buf: output buffer | |
2128 | * @buflen: length of the output buffer | |
2129 | * | |
2130 | * SCSI disk names starts at sda. The 26th device is sdz and the | |
2131 | * 27th is sdaa. The last one for two lettered suffix is sdzz | |
2132 | * which is followed by sdaaa. | |
2133 | * | |
2134 | * This is basically 26 base counting with one extra 'nil' entry | |
3ad2f3fb | 2135 | * at the beginning from the second digit on and can be |
3e1a7ff8 TH |
2136 | * determined using similar method as 26 base conversion with the |
2137 | * index shifted -1 after each digit is computed. | |
2138 | * | |
2139 | * CONTEXT: | |
2140 | * Don't care. | |
2141 | * | |
2142 | * RETURNS: | |
2143 | * 0 on success, -errno on failure. | |
2144 | */ | |
2145 | static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) | |
2146 | { | |
2147 | const int base = 'z' - 'a' + 1; | |
2148 | char *begin = buf + strlen(prefix); | |
2149 | char *end = buf + buflen; | |
2150 | char *p; | |
2151 | int unit; | |
2152 | ||
2153 | p = end - 1; | |
2154 | *p = '\0'; | |
2155 | unit = base; | |
2156 | do { | |
2157 | if (p == begin) | |
2158 | return -EINVAL; | |
2159 | *--p = 'a' + (index % unit); | |
2160 | index = (index / unit) - 1; | |
2161 | } while (index >= 0); | |
2162 | ||
2163 | memmove(begin, p, end - p); | |
2164 | memcpy(buf, prefix, strlen(prefix)); | |
2165 | ||
2166 | return 0; | |
2167 | } | |
2168 | ||
4ace92fc AV |
2169 | /* |
2170 | * The asynchronous part of sd_probe | |
2171 | */ | |
2172 | static void sd_probe_async(void *data, async_cookie_t cookie) | |
2173 | { | |
2174 | struct scsi_disk *sdkp = data; | |
2175 | struct scsi_device *sdp; | |
2176 | struct gendisk *gd; | |
2177 | u32 index; | |
2178 | struct device *dev; | |
2179 | ||
2180 | sdp = sdkp->device; | |
2181 | gd = sdkp->disk; | |
2182 | index = sdkp->index; | |
2183 | dev = &sdp->sdev_gendev; | |
2184 | ||
4ace92fc AV |
2185 | if (index < SD_MAX_DISKS) { |
2186 | gd->major = sd_major((index & 0xf0) >> 4); | |
2187 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
2188 | gd->minors = SD_MINORS; | |
2189 | } | |
2190 | gd->fops = &sd_fops; | |
2191 | gd->private_data = &sdkp->driver; | |
2192 | gd->queue = sdkp->device->request_queue; | |
2193 | ||
70a9b873 MP |
2194 | /* defaults, until the device tells us otherwise */ |
2195 | sdp->sector_size = 512; | |
2196 | sdkp->capacity = 0; | |
2197 | sdkp->media_present = 1; | |
2198 | sdkp->write_prot = 0; | |
2199 | sdkp->WCE = 0; | |
2200 | sdkp->RCD = 0; | |
2201 | sdkp->ATO = 0; | |
2202 | sdkp->first_scan = 1; | |
2203 | ||
4ace92fc AV |
2204 | sd_revalidate_disk(gd); |
2205 | ||
2206 | blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); | |
2207 | ||
2208 | gd->driverfs_dev = &sdp->sdev_gendev; | |
97fedbbe | 2209 | gd->flags = GENHD_FL_EXT_DEVT; |
4ace92fc AV |
2210 | if (sdp->removable) |
2211 | gd->flags |= GENHD_FL_REMOVABLE; | |
2212 | ||
2213 | dev_set_drvdata(dev, sdkp); | |
2214 | add_disk(gd); | |
2215 | sd_dif_config_host(sdkp); | |
2216 | ||
3821d768 MP |
2217 | sd_revalidate_disk(gd); |
2218 | ||
4ace92fc AV |
2219 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
2220 | sdp->removable ? "removable " : ""); | |
ea038f63 | 2221 | put_device(&sdkp->dev); |
4ace92fc AV |
2222 | } |
2223 | ||
1da177e4 LT |
2224 | /** |
2225 | * sd_probe - called during driver initialization and whenever a | |
2226 | * new scsi device is attached to the system. It is called once | |
2227 | * for each scsi device (not just disks) present. | |
2228 | * @dev: pointer to device object | |
2229 | * | |
2230 | * Returns 0 if successful (or not interested in this scsi device | |
2231 | * (e.g. scanner)); 1 when there is an error. | |
2232 | * | |
2233 | * Note: this function is invoked from the scsi mid-level. | |
2234 | * This function sets up the mapping between a given | |
2235 | * <host,channel,id,lun> (found in sdp) and new device name | |
2236 | * (e.g. /dev/sda). More precisely it is the block device major | |
2237 | * and minor number that is chosen here. | |
2238 | * | |
2239 | * Assume sd_attach is not re-entrant (for time being) | |
2240 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
2241 | **/ | |
2242 | static int sd_probe(struct device *dev) | |
2243 | { | |
2244 | struct scsi_device *sdp = to_scsi_device(dev); | |
2245 | struct scsi_disk *sdkp; | |
2246 | struct gendisk *gd; | |
2247 | u32 index; | |
2248 | int error; | |
2249 | ||
2250 | error = -ENODEV; | |
631e8a13 | 2251 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
2252 | goto out; |
2253 | ||
9ccfc756 JB |
2254 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
2255 | "sd_attach\n")); | |
1da177e4 LT |
2256 | |
2257 | error = -ENOMEM; | |
24669f75 | 2258 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
2259 | if (!sdkp) |
2260 | goto out; | |
2261 | ||
689d6fac | 2262 | gd = alloc_disk(SD_MINORS); |
1da177e4 LT |
2263 | if (!gd) |
2264 | goto out_free; | |
2265 | ||
f27bac27 TH |
2266 | do { |
2267 | if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) | |
2268 | goto out_put; | |
1da177e4 | 2269 | |
4034cc68 | 2270 | spin_lock(&sd_index_lock); |
f27bac27 | 2271 | error = ida_get_new(&sd_index_ida, &index); |
4034cc68 | 2272 | spin_unlock(&sd_index_lock); |
f27bac27 | 2273 | } while (error == -EAGAIN); |
1da177e4 | 2274 | |
1da177e4 LT |
2275 | if (error) |
2276 | goto out_put; | |
2277 | ||
3e1a7ff8 TH |
2278 | error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); |
2279 | if (error) | |
f27bac27 TH |
2280 | goto out_free_index; |
2281 | ||
1da177e4 LT |
2282 | sdkp->device = sdp; |
2283 | sdkp->driver = &sd_template; | |
2284 | sdkp->disk = gd; | |
2285 | sdkp->index = index; | |
2286 | sdkp->openers = 0; | |
c02e6002 | 2287 | sdkp->previous_state = 1; |
1da177e4 | 2288 | |
601e7638 JB |
2289 | if (!sdp->request_queue->rq_timeout) { |
2290 | if (sdp->type != TYPE_MOD) | |
2291 | blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); | |
2292 | else | |
2293 | blk_queue_rq_timeout(sdp->request_queue, | |
2294 | SD_MOD_TIMEOUT); | |
2295 | } | |
2296 | ||
2297 | device_initialize(&sdkp->dev); | |
2298 | sdkp->dev.parent = &sdp->sdev_gendev; | |
2299 | sdkp->dev.class = &sd_disk_class; | |
2300 | dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); | |
2301 | ||
2302 | if (device_add(&sdkp->dev)) | |
2303 | goto out_free_index; | |
2304 | ||
2305 | get_device(&sdp->sdev_gendev); | |
2306 | ||
ea038f63 | 2307 | get_device(&sdkp->dev); /* prevent release before async_schedule */ |
4ace92fc | 2308 | async_schedule(sd_probe_async, sdkp); |
1da177e4 LT |
2309 | |
2310 | return 0; | |
2311 | ||
f27bac27 | 2312 | out_free_index: |
4034cc68 | 2313 | spin_lock(&sd_index_lock); |
f27bac27 | 2314 | ida_remove(&sd_index_ida, index); |
4034cc68 | 2315 | spin_unlock(&sd_index_lock); |
6bdaa1f1 | 2316 | out_put: |
1da177e4 | 2317 | put_disk(gd); |
6bdaa1f1 | 2318 | out_free: |
1da177e4 | 2319 | kfree(sdkp); |
6bdaa1f1 | 2320 | out: |
1da177e4 LT |
2321 | return error; |
2322 | } | |
2323 | ||
2324 | /** | |
2325 | * sd_remove - called whenever a scsi disk (previously recognized by | |
2326 | * sd_probe) is detached from the system. It is called (potentially | |
2327 | * multiple times) during sd module unload. | |
2328 | * @sdp: pointer to mid level scsi device object | |
2329 | * | |
2330 | * Note: this function is invoked from the scsi mid-level. | |
2331 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
2332 | * that could be re-used by a subsequent sd_probe(). | |
2333 | * This function is not called when the built-in sd driver is "exit-ed". | |
2334 | **/ | |
2335 | static int sd_remove(struct device *dev) | |
2336 | { | |
601e7638 | 2337 | struct scsi_disk *sdkp; |
1da177e4 | 2338 | |
601e7638 JB |
2339 | async_synchronize_full(); |
2340 | sdkp = dev_get_drvdata(dev); | |
b391277a | 2341 | blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); |
ee959b00 | 2342 | device_del(&sdkp->dev); |
1da177e4 LT |
2343 | del_gendisk(sdkp->disk); |
2344 | sd_shutdown(dev); | |
39b7f1e2 | 2345 | |
0b950672 | 2346 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 2347 | dev_set_drvdata(dev, NULL); |
ee959b00 | 2348 | put_device(&sdkp->dev); |
0b950672 | 2349 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
2350 | |
2351 | return 0; | |
2352 | } | |
2353 | ||
2354 | /** | |
2355 | * scsi_disk_release - Called to free the scsi_disk structure | |
ee959b00 | 2356 | * @dev: pointer to embedded class device |
1da177e4 | 2357 | * |
0b950672 | 2358 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
2359 | * called on last put, you should always use the scsi_disk_get() |
2360 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
ee959b00 | 2361 | * and never do a direct put_device. |
1da177e4 | 2362 | **/ |
ee959b00 | 2363 | static void scsi_disk_release(struct device *dev) |
1da177e4 | 2364 | { |
ee959b00 | 2365 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
1da177e4 LT |
2366 | struct gendisk *disk = sdkp->disk; |
2367 | ||
4034cc68 | 2368 | spin_lock(&sd_index_lock); |
f27bac27 | 2369 | ida_remove(&sd_index_ida, sdkp->index); |
4034cc68 | 2370 | spin_unlock(&sd_index_lock); |
1da177e4 LT |
2371 | |
2372 | disk->private_data = NULL; | |
1da177e4 | 2373 | put_disk(disk); |
39b7f1e2 | 2374 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
2375 | |
2376 | kfree(sdkp); | |
2377 | } | |
2378 | ||
cc5d2c8c | 2379 | static int sd_start_stop_device(struct scsi_disk *sdkp, int start) |
c3c94c5a TH |
2380 | { |
2381 | unsigned char cmd[6] = { START_STOP }; /* START_VALID */ | |
2382 | struct scsi_sense_hdr sshdr; | |
cc5d2c8c | 2383 | struct scsi_device *sdp = sdkp->device; |
c3c94c5a TH |
2384 | int res; |
2385 | ||
2386 | if (start) | |
2387 | cmd[4] |= 1; /* START */ | |
2388 | ||
d2886ea3 SR |
2389 | if (sdp->start_stop_pwr_cond) |
2390 | cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ | |
2391 | ||
c3c94c5a TH |
2392 | if (!scsi_device_online(sdp)) |
2393 | return -ENODEV; | |
2394 | ||
2395 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, | |
f4f4e47e | 2396 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
c3c94c5a | 2397 | if (res) { |
cc5d2c8c JB |
2398 | sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
2399 | sd_print_result(sdkp, res); | |
c3c94c5a | 2400 | if (driver_byte(res) & DRIVER_SENSE) |
cc5d2c8c | 2401 | sd_print_sense_hdr(sdkp, &sshdr); |
c3c94c5a TH |
2402 | } |
2403 | ||
2404 | return res; | |
2405 | } | |
2406 | ||
1da177e4 LT |
2407 | /* |
2408 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
2409 | * the normal SCSI command structure. Wait for the command to | |
2410 | * complete. | |
2411 | */ | |
2412 | static void sd_shutdown(struct device *dev) | |
2413 | { | |
39b7f1e2 | 2414 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
2415 | |
2416 | if (!sdkp) | |
2417 | return; /* this can happen */ | |
2418 | ||
39b7f1e2 | 2419 | if (sdkp->WCE) { |
e73aec82 MP |
2420 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
2421 | sd_sync_cache(sdkp); | |
39b7f1e2 | 2422 | } |
c3c94c5a | 2423 | |
cc5d2c8c JB |
2424 | if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { |
2425 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); | |
2426 | sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2427 | } |
2428 | ||
39b7f1e2 AS |
2429 | scsi_disk_put(sdkp); |
2430 | } | |
1da177e4 | 2431 | |
c3c94c5a TH |
2432 | static int sd_suspend(struct device *dev, pm_message_t mesg) |
2433 | { | |
c3c94c5a | 2434 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2435 | int ret = 0; |
c3c94c5a TH |
2436 | |
2437 | if (!sdkp) | |
2438 | return 0; /* this can happen */ | |
2439 | ||
2440 | if (sdkp->WCE) { | |
cc5d2c8c | 2441 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
c3c94c5a TH |
2442 | ret = sd_sync_cache(sdkp); |
2443 | if (ret) | |
09ff92fe | 2444 | goto done; |
c3c94c5a TH |
2445 | } |
2446 | ||
3a2d5b70 | 2447 | if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { |
cc5d2c8c JB |
2448 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
2449 | ret = sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2450 | } |
2451 | ||
09ff92fe AS |
2452 | done: |
2453 | scsi_disk_put(sdkp); | |
2454 | return ret; | |
c3c94c5a TH |
2455 | } |
2456 | ||
2457 | static int sd_resume(struct device *dev) | |
2458 | { | |
c3c94c5a | 2459 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2460 | int ret = 0; |
c3c94c5a | 2461 | |
cc5d2c8c | 2462 | if (!sdkp->device->manage_start_stop) |
09ff92fe | 2463 | goto done; |
c3c94c5a | 2464 | |
cc5d2c8c | 2465 | sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
09ff92fe | 2466 | ret = sd_start_stop_device(sdkp, 1); |
c3c94c5a | 2467 | |
09ff92fe AS |
2468 | done: |
2469 | scsi_disk_put(sdkp); | |
2470 | return ret; | |
c3c94c5a TH |
2471 | } |
2472 | ||
1da177e4 LT |
2473 | /** |
2474 | * init_sd - entry point for this driver (both when built in or when | |
2475 | * a module). | |
2476 | * | |
2477 | * Note: this function registers this driver with the scsi mid-level. | |
2478 | **/ | |
2479 | static int __init init_sd(void) | |
2480 | { | |
5e4009ba | 2481 | int majors = 0, i, err; |
1da177e4 LT |
2482 | |
2483 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
2484 | ||
2485 | for (i = 0; i < SD_MAJORS; i++) | |
2486 | if (register_blkdev(sd_major(i), "sd") == 0) | |
2487 | majors++; | |
2488 | ||
2489 | if (!majors) | |
2490 | return -ENODEV; | |
2491 | ||
5e4009ba JG |
2492 | err = class_register(&sd_disk_class); |
2493 | if (err) | |
2494 | goto err_out; | |
6bdaa1f1 | 2495 | |
5e4009ba JG |
2496 | err = scsi_register_driver(&sd_template.gendrv); |
2497 | if (err) | |
2498 | goto err_out_class; | |
2499 | ||
4e7392ec MP |
2500 | sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE, |
2501 | 0, 0, NULL); | |
2502 | if (!sd_cdb_cache) { | |
2503 | printk(KERN_ERR "sd: can't init extended cdb cache\n"); | |
2504 | goto err_out_class; | |
2505 | } | |
2506 | ||
2507 | sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache); | |
2508 | if (!sd_cdb_pool) { | |
2509 | printk(KERN_ERR "sd: can't init extended cdb pool\n"); | |
2510 | goto err_out_cache; | |
2511 | } | |
2512 | ||
5e4009ba JG |
2513 | return 0; |
2514 | ||
4e7392ec MP |
2515 | err_out_cache: |
2516 | kmem_cache_destroy(sd_cdb_cache); | |
2517 | ||
5e4009ba JG |
2518 | err_out_class: |
2519 | class_unregister(&sd_disk_class); | |
2520 | err_out: | |
2521 | for (i = 0; i < SD_MAJORS; i++) | |
2522 | unregister_blkdev(sd_major(i), "sd"); | |
2523 | return err; | |
1da177e4 LT |
2524 | } |
2525 | ||
2526 | /** | |
2527 | * exit_sd - exit point for this driver (when it is a module). | |
2528 | * | |
2529 | * Note: this function unregisters this driver from the scsi mid-level. | |
2530 | **/ | |
2531 | static void __exit exit_sd(void) | |
2532 | { | |
2533 | int i; | |
2534 | ||
2535 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
2536 | ||
4e7392ec MP |
2537 | mempool_destroy(sd_cdb_pool); |
2538 | kmem_cache_destroy(sd_cdb_cache); | |
2539 | ||
1da177e4 | 2540 | scsi_unregister_driver(&sd_template.gendrv); |
5e4009ba JG |
2541 | class_unregister(&sd_disk_class); |
2542 | ||
1da177e4 LT |
2543 | for (i = 0; i < SD_MAJORS; i++) |
2544 | unregister_blkdev(sd_major(i), "sd"); | |
2545 | } | |
2546 | ||
1da177e4 LT |
2547 | module_init(init_sd); |
2548 | module_exit(exit_sd); | |
e73aec82 MP |
2549 | |
2550 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, | |
2551 | struct scsi_sense_hdr *sshdr) | |
2552 | { | |
2553 | sd_printk(KERN_INFO, sdkp, ""); | |
2554 | scsi_show_sense_hdr(sshdr); | |
2555 | sd_printk(KERN_INFO, sdkp, ""); | |
2556 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); | |
2557 | } | |
2558 | ||
2559 | static void sd_print_result(struct scsi_disk *sdkp, int result) | |
2560 | { | |
2561 | sd_printk(KERN_INFO, sdkp, ""); | |
2562 | scsi_show_result(result); | |
2563 | } | |
2564 |