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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> |
1da177e4 | 52 | #include <asm/uaccess.h> |
8f76d151 | 53 | #include <asm/unaligned.h> |
1da177e4 LT |
54 | |
55 | #include <scsi/scsi.h> | |
56 | #include <scsi/scsi_cmnd.h> | |
57 | #include <scsi/scsi_dbg.h> | |
58 | #include <scsi/scsi_device.h> | |
59 | #include <scsi/scsi_driver.h> | |
60 | #include <scsi/scsi_eh.h> | |
61 | #include <scsi/scsi_host.h> | |
62 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
63 | #include <scsi/scsicam.h> |
64 | ||
aa91696e | 65 | #include "sd.h" |
1da177e4 LT |
66 | #include "scsi_logging.h" |
67 | ||
f018fa55 RH |
68 | MODULE_AUTHOR("Eric Youngdale"); |
69 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
70 | MODULE_LICENSE("GPL"); | |
71 | ||
72 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
73 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
74 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
75 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
85 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
86 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
87 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
d7b8bcb0 MT |
88 | MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); |
89 | MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); | |
90 | MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); | |
f018fa55 | 91 | |
870d6656 | 92 | #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) |
f615b48c | 93 | #define SD_MINORS 16 |
870d6656 | 94 | #else |
3e1a7ff8 | 95 | #define SD_MINORS 0 |
870d6656 TH |
96 | #endif |
97 | ||
7b3d9545 LT |
98 | static int sd_revalidate_disk(struct gendisk *); |
99 | static int sd_probe(struct device *); | |
100 | static int sd_remove(struct device *); | |
101 | static void sd_shutdown(struct device *); | |
102 | static int sd_suspend(struct device *, pm_message_t state); | |
103 | static int sd_resume(struct device *); | |
104 | static void sd_rescan(struct device *); | |
105 | static int sd_done(struct scsi_cmnd *); | |
106 | static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); | |
ee959b00 | 107 | static void scsi_disk_release(struct device *cdev); |
7b3d9545 LT |
108 | static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); |
109 | static void sd_print_result(struct scsi_disk *, int); | |
110 | ||
4034cc68 | 111 | static DEFINE_SPINLOCK(sd_index_lock); |
f27bac27 | 112 | static DEFINE_IDA(sd_index_ida); |
1da177e4 LT |
113 | |
114 | /* This semaphore is used to mediate the 0->1 reference get in the | |
115 | * face of object destruction (i.e. we can't allow a get on an | |
116 | * object after last put) */ | |
0b950672 | 117 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 | 118 | |
6bdaa1f1 JB |
119 | static const char *sd_cache_types[] = { |
120 | "write through", "none", "write back", | |
121 | "write back, no read (daft)" | |
122 | }; | |
123 | ||
ee959b00 TJ |
124 | static ssize_t |
125 | sd_store_cache_type(struct device *dev, struct device_attribute *attr, | |
126 | const char *buf, size_t count) | |
6bdaa1f1 JB |
127 | { |
128 | int i, ct = -1, rcd, wce, sp; | |
ee959b00 | 129 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
130 | struct scsi_device *sdp = sdkp->device; |
131 | char buffer[64]; | |
132 | char *buffer_data; | |
133 | struct scsi_mode_data data; | |
134 | struct scsi_sense_hdr sshdr; | |
135 | int len; | |
136 | ||
137 | if (sdp->type != TYPE_DISK) | |
138 | /* no cache control on RBC devices; theoretically they | |
139 | * can do it, but there's probably so many exceptions | |
140 | * it's not worth the risk */ | |
141 | return -EINVAL; | |
142 | ||
6391a113 | 143 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
144 | const int len = strlen(sd_cache_types[i]); |
145 | if (strncmp(sd_cache_types[i], buf, len) == 0 && | |
146 | buf[len] == '\n') { | |
147 | ct = i; | |
148 | break; | |
149 | } | |
150 | } | |
151 | if (ct < 0) | |
152 | return -EINVAL; | |
153 | rcd = ct & 0x01 ? 1 : 0; | |
154 | wce = ct & 0x02 ? 1 : 0; | |
155 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
156 | SD_MAX_RETRIES, &data, NULL)) | |
157 | return -EINVAL; | |
a9312fb8 | 158 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
159 | data.block_descriptor_length); |
160 | buffer_data = buffer + data.header_length + | |
161 | data.block_descriptor_length; | |
162 | buffer_data[2] &= ~0x05; | |
163 | buffer_data[2] |= wce << 2 | rcd; | |
164 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
165 | ||
166 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
167 | SD_MAX_RETRIES, &data, &sshdr)) { | |
168 | if (scsi_sense_valid(&sshdr)) | |
e73aec82 | 169 | sd_print_sense_hdr(sdkp, &sshdr); |
6bdaa1f1 JB |
170 | return -EINVAL; |
171 | } | |
f98a8cae | 172 | revalidate_disk(sdkp->disk); |
6bdaa1f1 JB |
173 | return count; |
174 | } | |
175 | ||
ee959b00 TJ |
176 | static ssize_t |
177 | sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
178 | const char *buf, size_t count) | |
c3c94c5a | 179 | { |
ee959b00 | 180 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
181 | struct scsi_device *sdp = sdkp->device; |
182 | ||
183 | if (!capable(CAP_SYS_ADMIN)) | |
184 | return -EACCES; | |
185 | ||
186 | sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); | |
187 | ||
188 | return count; | |
189 | } | |
190 | ||
ee959b00 TJ |
191 | static ssize_t |
192 | sd_store_allow_restart(struct device *dev, struct device_attribute *attr, | |
193 | const char *buf, size_t count) | |
a144c5ae | 194 | { |
ee959b00 | 195 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
196 | struct scsi_device *sdp = sdkp->device; |
197 | ||
198 | if (!capable(CAP_SYS_ADMIN)) | |
199 | return -EACCES; | |
200 | ||
201 | if (sdp->type != TYPE_DISK) | |
202 | return -EINVAL; | |
203 | ||
204 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); | |
205 | ||
206 | return count; | |
207 | } | |
208 | ||
ee959b00 TJ |
209 | static ssize_t |
210 | sd_show_cache_type(struct device *dev, struct device_attribute *attr, | |
211 | char *buf) | |
6bdaa1f1 | 212 | { |
ee959b00 | 213 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
214 | int ct = sdkp->RCD + 2*sdkp->WCE; |
215 | ||
216 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
217 | } | |
218 | ||
ee959b00 TJ |
219 | static ssize_t |
220 | sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) | |
6bdaa1f1 | 221 | { |
ee959b00 | 222 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
223 | |
224 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
225 | } | |
226 | ||
ee959b00 TJ |
227 | static ssize_t |
228 | sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
229 | char *buf) | |
c3c94c5a | 230 | { |
ee959b00 | 231 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
232 | struct scsi_device *sdp = sdkp->device; |
233 | ||
234 | return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); | |
235 | } | |
236 | ||
ee959b00 TJ |
237 | static ssize_t |
238 | sd_show_allow_restart(struct device *dev, struct device_attribute *attr, | |
239 | char *buf) | |
a144c5ae | 240 | { |
ee959b00 | 241 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
242 | |
243 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
244 | } | |
245 | ||
e0597d70 MP |
246 | static ssize_t |
247 | sd_show_protection_type(struct device *dev, struct device_attribute *attr, | |
248 | char *buf) | |
249 | { | |
250 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
251 | ||
252 | return snprintf(buf, 20, "%u\n", sdkp->protection_type); | |
253 | } | |
254 | ||
255 | static ssize_t | |
256 | sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, | |
257 | char *buf) | |
258 | { | |
259 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
260 | ||
261 | return snprintf(buf, 20, "%u\n", sdkp->ATO); | |
262 | } | |
263 | ||
ee959b00 | 264 | static struct device_attribute sd_disk_attrs[] = { |
6bdaa1f1 JB |
265 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, |
266 | sd_store_cache_type), | |
267 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
a144c5ae BK |
268 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
269 | sd_store_allow_restart), | |
c3c94c5a TH |
270 | __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
271 | sd_store_manage_start_stop), | |
e0597d70 MP |
272 | __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), |
273 | __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), | |
6bdaa1f1 JB |
274 | __ATTR_NULL, |
275 | }; | |
276 | ||
277 | static struct class sd_disk_class = { | |
278 | .name = "scsi_disk", | |
279 | .owner = THIS_MODULE, | |
ee959b00 TJ |
280 | .dev_release = scsi_disk_release, |
281 | .dev_attrs = sd_disk_attrs, | |
6bdaa1f1 | 282 | }; |
1da177e4 LT |
283 | |
284 | static struct scsi_driver sd_template = { | |
285 | .owner = THIS_MODULE, | |
286 | .gendrv = { | |
287 | .name = "sd", | |
288 | .probe = sd_probe, | |
289 | .remove = sd_remove, | |
c3c94c5a TH |
290 | .suspend = sd_suspend, |
291 | .resume = sd_resume, | |
1da177e4 LT |
292 | .shutdown = sd_shutdown, |
293 | }, | |
294 | .rescan = sd_rescan, | |
7b3d9545 | 295 | .done = sd_done, |
1da177e4 LT |
296 | }; |
297 | ||
298 | /* | |
299 | * Device no to disk mapping: | |
300 | * | |
301 | * major disc2 disc p1 | |
302 | * |............|.............|....|....| <- dev_t | |
303 | * 31 20 19 8 7 4 3 0 | |
304 | * | |
305 | * Inside a major, we have 16k disks, however mapped non- | |
306 | * contiguously. The first 16 disks are for major0, the next | |
307 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
308 | * for major1, ... | |
309 | * As we stay compatible with our numbering scheme, we can reuse | |
310 | * the well-know SCSI majors 8, 65--71, 136--143. | |
311 | */ | |
312 | static int sd_major(int major_idx) | |
313 | { | |
314 | switch (major_idx) { | |
315 | case 0: | |
316 | return SCSI_DISK0_MAJOR; | |
317 | case 1 ... 7: | |
318 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
319 | case 8 ... 15: | |
320 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
321 | default: | |
322 | BUG(); | |
323 | return 0; /* shut up gcc */ | |
324 | } | |
325 | } | |
326 | ||
39b7f1e2 | 327 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
328 | { |
329 | struct scsi_disk *sdkp = NULL; | |
330 | ||
39b7f1e2 AS |
331 | if (disk->private_data) { |
332 | sdkp = scsi_disk(disk); | |
333 | if (scsi_device_get(sdkp->device) == 0) | |
ee959b00 | 334 | get_device(&sdkp->dev); |
39b7f1e2 AS |
335 | else |
336 | sdkp = NULL; | |
337 | } | |
338 | return sdkp; | |
339 | } | |
340 | ||
341 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
342 | { | |
343 | struct scsi_disk *sdkp; | |
344 | ||
0b950672 | 345 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 346 | sdkp = __scsi_disk_get(disk); |
0b950672 | 347 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 348 | return sdkp; |
39b7f1e2 | 349 | } |
1da177e4 | 350 | |
39b7f1e2 AS |
351 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
352 | { | |
353 | struct scsi_disk *sdkp; | |
354 | ||
0b950672 | 355 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
356 | sdkp = dev_get_drvdata(dev); |
357 | if (sdkp) | |
358 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 359 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
360 | return sdkp; |
361 | } | |
362 | ||
363 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
364 | { | |
365 | struct scsi_device *sdev = sdkp->device; | |
366 | ||
0b950672 | 367 | mutex_lock(&sd_ref_mutex); |
ee959b00 | 368 | put_device(&sdkp->dev); |
1da177e4 | 369 | scsi_device_put(sdev); |
0b950672 | 370 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
371 | } |
372 | ||
373 | /** | |
374 | * sd_init_command - build a scsi (read or write) command from | |
375 | * information in the request structure. | |
376 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
377 | * contains request and into which the scsi command is written | |
378 | * | |
379 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
380 | **/ | |
7f9a6bc4 | 381 | static int sd_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 382 | { |
7f9a6bc4 JB |
383 | struct scsi_cmnd *SCpnt; |
384 | struct scsi_device *sdp = q->queuedata; | |
776b23a0 | 385 | struct gendisk *disk = rq->rq_disk; |
af55ff67 | 386 | struct scsi_disk *sdkp; |
83096ebf | 387 | sector_t block = blk_rq_pos(rq); |
18351070 | 388 | sector_t threshold; |
83096ebf | 389 | unsigned int this_count = blk_rq_sectors(rq); |
bd623e79 | 390 | int ret, host_dif; |
7f9a6bc4 JB |
391 | |
392 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { | |
393 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); | |
394 | goto out; | |
395 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
396 | ret = BLKPREP_KILL; | |
397 | goto out; | |
398 | } | |
399 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
400 | if (ret != BLKPREP_OK) | |
401 | goto out; | |
402 | SCpnt = rq->special; | |
af55ff67 | 403 | sdkp = scsi_disk(disk); |
7f9a6bc4 JB |
404 | |
405 | /* from here on until we're complete, any goto out | |
406 | * is used for a killable error condition */ | |
407 | ret = BLKPREP_KILL; | |
1da177e4 | 408 | |
fa0d34be MP |
409 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
410 | "sd_init_command: block=%llu, " | |
411 | "count=%d\n", | |
412 | (unsigned long long)block, | |
413 | this_count)); | |
1da177e4 LT |
414 | |
415 | if (!sdp || !scsi_device_online(sdp) || | |
83096ebf | 416 | block + blk_rq_sectors(rq) > get_capacity(disk)) { |
fa0d34be | 417 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
83096ebf TH |
418 | "Finishing %u sectors\n", |
419 | blk_rq_sectors(rq))); | |
fa0d34be MP |
420 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
421 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 422 | goto out; |
1da177e4 LT |
423 | } |
424 | ||
425 | if (sdp->changed) { | |
426 | /* | |
427 | * quietly refuse to do anything to a changed disc until | |
428 | * the changed bit has been reset | |
429 | */ | |
430 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
7f9a6bc4 | 431 | goto out; |
1da177e4 | 432 | } |
7f9a6bc4 | 433 | |
a0899d4d | 434 | /* |
18351070 LT |
435 | * Some SD card readers can't handle multi-sector accesses which touch |
436 | * the last one or two hardware sectors. Split accesses as needed. | |
a0899d4d | 437 | */ |
18351070 LT |
438 | threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * |
439 | (sdp->sector_size / 512); | |
440 | ||
441 | if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { | |
442 | if (block < threshold) { | |
443 | /* Access up to the threshold but not beyond */ | |
444 | this_count = threshold - block; | |
445 | } else { | |
446 | /* Access only a single hardware sector */ | |
447 | this_count = sdp->sector_size / 512; | |
448 | } | |
449 | } | |
a0899d4d | 450 | |
fa0d34be MP |
451 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
452 | (unsigned long long)block)); | |
1da177e4 LT |
453 | |
454 | /* | |
455 | * If we have a 1K hardware sectorsize, prevent access to single | |
456 | * 512 byte sectors. In theory we could handle this - in fact | |
457 | * the scsi cdrom driver must be able to handle this because | |
458 | * we typically use 1K blocksizes, and cdroms typically have | |
459 | * 2K hardware sectorsizes. Of course, things are simpler | |
460 | * with the cdrom, since it is read-only. For performance | |
461 | * reasons, the filesystems should be able to handle this | |
462 | * and not force the scsi disk driver to use bounce buffers | |
463 | * for this. | |
464 | */ | |
465 | if (sdp->sector_size == 1024) { | |
83096ebf | 466 | if ((block & 1) || (blk_rq_sectors(rq) & 1)) { |
e73aec82 MP |
467 | scmd_printk(KERN_ERR, SCpnt, |
468 | "Bad block number requested\n"); | |
7f9a6bc4 | 469 | goto out; |
1da177e4 LT |
470 | } else { |
471 | block = block >> 1; | |
472 | this_count = this_count >> 1; | |
473 | } | |
474 | } | |
475 | if (sdp->sector_size == 2048) { | |
83096ebf | 476 | if ((block & 3) || (blk_rq_sectors(rq) & 3)) { |
e73aec82 MP |
477 | scmd_printk(KERN_ERR, SCpnt, |
478 | "Bad block number requested\n"); | |
7f9a6bc4 | 479 | goto out; |
1da177e4 LT |
480 | } else { |
481 | block = block >> 2; | |
482 | this_count = this_count >> 2; | |
483 | } | |
484 | } | |
485 | if (sdp->sector_size == 4096) { | |
83096ebf | 486 | if ((block & 7) || (blk_rq_sectors(rq) & 7)) { |
e73aec82 MP |
487 | scmd_printk(KERN_ERR, SCpnt, |
488 | "Bad block number requested\n"); | |
7f9a6bc4 | 489 | goto out; |
1da177e4 LT |
490 | } else { |
491 | block = block >> 3; | |
492 | this_count = this_count >> 3; | |
493 | } | |
494 | } | |
495 | if (rq_data_dir(rq) == WRITE) { | |
496 | if (!sdp->writeable) { | |
7f9a6bc4 | 497 | goto out; |
1da177e4 LT |
498 | } |
499 | SCpnt->cmnd[0] = WRITE_6; | |
500 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
af55ff67 MP |
501 | |
502 | if (blk_integrity_rq(rq) && | |
503 | sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) | |
504 | goto out; | |
505 | ||
1da177e4 LT |
506 | } else if (rq_data_dir(rq) == READ) { |
507 | SCpnt->cmnd[0] = READ_6; | |
508 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
509 | } else { | |
e73aec82 | 510 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
7f9a6bc4 | 511 | goto out; |
1da177e4 LT |
512 | } |
513 | ||
fa0d34be | 514 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
83096ebf | 515 | "%s %d/%u 512 byte blocks.\n", |
fa0d34be MP |
516 | (rq_data_dir(rq) == WRITE) ? |
517 | "writing" : "reading", this_count, | |
83096ebf | 518 | blk_rq_sectors(rq))); |
1da177e4 | 519 | |
af55ff67 | 520 | /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ |
bd623e79 MP |
521 | host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); |
522 | if (host_dif) | |
af55ff67 MP |
523 | SCpnt->cmnd[1] = 1 << 5; |
524 | else | |
525 | SCpnt->cmnd[1] = 0; | |
526 | ||
1da177e4 LT |
527 | if (block > 0xffffffff) { |
528 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
007365ad | 529 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
530 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
531 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
532 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
533 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
534 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
535 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
536 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
537 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
538 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
539 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
540 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
541 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
542 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
543 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
af55ff67 | 544 | scsi_device_protection(SCpnt->device) || |
1da177e4 LT |
545 | SCpnt->device->use_10_for_rw) { |
546 | if (this_count > 0xffff) | |
547 | this_count = 0xffff; | |
548 | ||
549 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
007365ad | 550 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
551 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
552 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
553 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
554 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
555 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
556 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
557 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
558 | } else { | |
007365ad TH |
559 | if (unlikely(blk_fua_rq(rq))) { |
560 | /* | |
561 | * This happens only if this drive failed | |
562 | * 10byte rw command with ILLEGAL_REQUEST | |
563 | * during operation and thus turned off | |
564 | * use_10_for_rw. | |
565 | */ | |
e73aec82 MP |
566 | scmd_printk(KERN_ERR, SCpnt, |
567 | "FUA write on READ/WRITE(6) drive\n"); | |
7f9a6bc4 | 568 | goto out; |
007365ad TH |
569 | } |
570 | ||
1da177e4 LT |
571 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
572 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
573 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
574 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
575 | SCpnt->cmnd[5] = 0; | |
576 | } | |
30b0c37b | 577 | SCpnt->sdb.length = this_count * sdp->sector_size; |
1da177e4 | 578 | |
af55ff67 | 579 | /* If DIF or DIX is enabled, tell HBA how to handle request */ |
bd623e79 | 580 | if (host_dif || scsi_prot_sg_count(SCpnt)) |
9e06688e MP |
581 | sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt), |
582 | sdkp->protection_type); | |
af55ff67 | 583 | |
1da177e4 LT |
584 | /* |
585 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
586 | * host adapter, it's safe to assume that we can at least transfer | |
587 | * this many bytes between each connect / disconnect. | |
588 | */ | |
589 | SCpnt->transfersize = sdp->sector_size; | |
590 | SCpnt->underflow = this_count << 9; | |
591 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 | 592 | |
1da177e4 LT |
593 | /* |
594 | * This indicates that the command is ready from our end to be | |
595 | * queued. | |
596 | */ | |
7f9a6bc4 JB |
597 | ret = BLKPREP_OK; |
598 | out: | |
599 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
600 | } |
601 | ||
602 | /** | |
603 | * sd_open - open a scsi disk device | |
604 | * @inode: only i_rdev member may be used | |
605 | * @filp: only f_mode and f_flags may be used | |
606 | * | |
607 | * Returns 0 if successful. Returns a negated errno value in case | |
608 | * of error. | |
609 | * | |
610 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
611 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
612 | * In the latter case @inode and @filp carry an abridged amount | |
613 | * of information as noted above. | |
614 | **/ | |
0338e291 | 615 | static int sd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 616 | { |
0338e291 | 617 | struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); |
1da177e4 LT |
618 | struct scsi_device *sdev; |
619 | int retval; | |
620 | ||
0338e291 | 621 | if (!sdkp) |
1da177e4 LT |
622 | return -ENXIO; |
623 | ||
fa0d34be | 624 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1da177e4 LT |
625 | |
626 | sdev = sdkp->device; | |
627 | ||
628 | /* | |
629 | * If the device is in error recovery, wait until it is done. | |
630 | * If the device is offline, then disallow any access to it. | |
631 | */ | |
632 | retval = -ENXIO; | |
633 | if (!scsi_block_when_processing_errors(sdev)) | |
634 | goto error_out; | |
635 | ||
636 | if (sdev->removable || sdkp->write_prot) | |
0338e291 | 637 | check_disk_change(bdev); |
1da177e4 LT |
638 | |
639 | /* | |
640 | * If the drive is empty, just let the open fail. | |
641 | */ | |
642 | retval = -ENOMEDIUM; | |
0338e291 | 643 | if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) |
1da177e4 LT |
644 | goto error_out; |
645 | ||
646 | /* | |
647 | * If the device has the write protect tab set, have the open fail | |
648 | * if the user expects to be able to write to the thing. | |
649 | */ | |
650 | retval = -EROFS; | |
0338e291 | 651 | if (sdkp->write_prot && (mode & FMODE_WRITE)) |
1da177e4 LT |
652 | goto error_out; |
653 | ||
654 | /* | |
655 | * It is possible that the disk changing stuff resulted in | |
656 | * the device being taken offline. If this is the case, | |
657 | * report this to the user, and don't pretend that the | |
658 | * open actually succeeded. | |
659 | */ | |
660 | retval = -ENXIO; | |
661 | if (!scsi_device_online(sdev)) | |
662 | goto error_out; | |
663 | ||
664 | if (!sdkp->openers++ && sdev->removable) { | |
665 | if (scsi_block_when_processing_errors(sdev)) | |
666 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
667 | } | |
668 | ||
669 | return 0; | |
670 | ||
671 | error_out: | |
672 | scsi_disk_put(sdkp); | |
673 | return retval; | |
674 | } | |
675 | ||
676 | /** | |
677 | * sd_release - invoked when the (last) close(2) is called on this | |
678 | * scsi disk. | |
679 | * @inode: only i_rdev member may be used | |
680 | * @filp: only f_mode and f_flags may be used | |
681 | * | |
682 | * Returns 0. | |
683 | * | |
684 | * Note: may block (uninterruptible) if error recovery is underway | |
685 | * on this disk. | |
686 | **/ | |
0338e291 | 687 | static int sd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 688 | { |
1da177e4 LT |
689 | struct scsi_disk *sdkp = scsi_disk(disk); |
690 | struct scsi_device *sdev = sdkp->device; | |
691 | ||
56937f7b | 692 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); |
1da177e4 LT |
693 | |
694 | if (!--sdkp->openers && sdev->removable) { | |
695 | if (scsi_block_when_processing_errors(sdev)) | |
696 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
697 | } | |
698 | ||
699 | /* | |
700 | * XXX and what if there are packets in flight and this close() | |
701 | * XXX is followed by a "rmmod sd_mod"? | |
702 | */ | |
703 | scsi_disk_put(sdkp); | |
704 | return 0; | |
705 | } | |
706 | ||
a885c8c4 | 707 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
708 | { |
709 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
710 | struct scsi_device *sdp = sdkp->device; | |
711 | struct Scsi_Host *host = sdp->host; | |
712 | int diskinfo[4]; | |
713 | ||
714 | /* default to most commonly used values */ | |
715 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
716 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
717 | diskinfo[2] = sdkp->capacity >> 11; | |
718 | ||
719 | /* override with calculated, extended default, or driver values */ | |
720 | if (host->hostt->bios_param) | |
721 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
722 | else | |
723 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
724 | ||
a885c8c4 CH |
725 | geo->heads = diskinfo[0]; |
726 | geo->sectors = diskinfo[1]; | |
727 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
728 | return 0; |
729 | } | |
730 | ||
731 | /** | |
732 | * sd_ioctl - process an ioctl | |
733 | * @inode: only i_rdev/i_bdev members may be used | |
734 | * @filp: only f_mode and f_flags may be used | |
735 | * @cmd: ioctl command number | |
736 | * @arg: this is third argument given to ioctl(2) system call. | |
737 | * Often contains a pointer. | |
738 | * | |
739 | * Returns 0 if successful (some ioctls return postive numbers on | |
740 | * success as well). Returns a negated errno value in case of error. | |
741 | * | |
742 | * Note: most ioctls are forward onto the block subsystem or further | |
3a4fa0a2 | 743 | * down in the scsi subsystem. |
1da177e4 | 744 | **/ |
0338e291 | 745 | static int sd_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
746 | unsigned int cmd, unsigned long arg) |
747 | { | |
1da177e4 LT |
748 | struct gendisk *disk = bdev->bd_disk; |
749 | struct scsi_device *sdp = scsi_disk(disk)->device; | |
750 | void __user *p = (void __user *)arg; | |
751 | int error; | |
752 | ||
753 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", | |
754 | disk->disk_name, cmd)); | |
755 | ||
756 | /* | |
757 | * If we are in the middle of error recovery, don't let anyone | |
758 | * else try and use this device. Also, if error recovery fails, it | |
759 | * may try and take the device offline, in which case all further | |
760 | * access to the device is prohibited. | |
761 | */ | |
83ff6fe8 | 762 | error = scsi_nonblockable_ioctl(sdp, cmd, p, |
fd4ce1ac | 763 | (mode & FMODE_NDELAY) != 0); |
1da177e4 LT |
764 | if (!scsi_block_when_processing_errors(sdp) || !error) |
765 | return error; | |
766 | ||
1da177e4 LT |
767 | /* |
768 | * Send SCSI addressing ioctls directly to mid level, send other | |
769 | * ioctls to block level and then onto mid level if they can't be | |
770 | * resolved. | |
771 | */ | |
772 | switch (cmd) { | |
773 | case SCSI_IOCTL_GET_IDLUN: | |
774 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
775 | return scsi_ioctl(sdp, cmd, p); | |
776 | default: | |
0338e291 | 777 | error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); |
1da177e4 LT |
778 | if (error != -ENOTTY) |
779 | return error; | |
780 | } | |
781 | return scsi_ioctl(sdp, cmd, p); | |
782 | } | |
783 | ||
784 | static void set_media_not_present(struct scsi_disk *sdkp) | |
785 | { | |
786 | sdkp->media_present = 0; | |
787 | sdkp->capacity = 0; | |
788 | sdkp->device->changed = 1; | |
789 | } | |
790 | ||
791 | /** | |
792 | * sd_media_changed - check if our medium changed | |
793 | * @disk: kernel device descriptor | |
794 | * | |
795 | * Returns 0 if not applicable or no change; 1 if change | |
796 | * | |
797 | * Note: this function is invoked from the block subsystem. | |
798 | **/ | |
799 | static int sd_media_changed(struct gendisk *disk) | |
800 | { | |
801 | struct scsi_disk *sdkp = scsi_disk(disk); | |
802 | struct scsi_device *sdp = sdkp->device; | |
001aac25 | 803 | struct scsi_sense_hdr *sshdr = NULL; |
1da177e4 LT |
804 | int retval; |
805 | ||
fa0d34be | 806 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); |
1da177e4 LT |
807 | |
808 | if (!sdp->removable) | |
809 | return 0; | |
810 | ||
811 | /* | |
812 | * If the device is offline, don't send any commands - just pretend as | |
813 | * if the command failed. If the device ever comes back online, we | |
814 | * can deal with it then. It is only because of unrecoverable errors | |
815 | * that we would ever take a device offline in the first place. | |
816 | */ | |
285e9670 KS |
817 | if (!scsi_device_online(sdp)) { |
818 | set_media_not_present(sdkp); | |
819 | retval = 1; | |
820 | goto out; | |
821 | } | |
1da177e4 LT |
822 | |
823 | /* | |
824 | * Using TEST_UNIT_READY enables differentiation between drive with | |
825 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
826 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
827 | * | |
828 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
829 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
830 | * sd_revalidate() is called. | |
831 | */ | |
832 | retval = -ENODEV; | |
285e9670 | 833 | |
001aac25 JB |
834 | if (scsi_block_when_processing_errors(sdp)) { |
835 | sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); | |
836 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, | |
837 | sshdr); | |
838 | } | |
1da177e4 LT |
839 | |
840 | /* | |
841 | * Unable to test, unit probably not ready. This usually | |
842 | * means there is no disc in the drive. Mark as changed, | |
843 | * and we will figure it out later once the drive is | |
844 | * available again. | |
845 | */ | |
001aac25 JB |
846 | if (retval || (scsi_sense_valid(sshdr) && |
847 | /* 0x3a is medium not present */ | |
848 | sshdr->asc == 0x3a)) { | |
285e9670 KS |
849 | set_media_not_present(sdkp); |
850 | retval = 1; | |
851 | goto out; | |
852 | } | |
1da177e4 LT |
853 | |
854 | /* | |
855 | * For removable scsi disk we have to recognise the presence | |
856 | * of a disk in the drive. This is kept in the struct scsi_disk | |
857 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
858 | */ | |
859 | sdkp->media_present = 1; | |
860 | ||
861 | retval = sdp->changed; | |
862 | sdp->changed = 0; | |
285e9670 KS |
863 | out: |
864 | if (retval != sdkp->previous_state) | |
865 | sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); | |
866 | sdkp->previous_state = retval; | |
001aac25 | 867 | kfree(sshdr); |
1da177e4 | 868 | return retval; |
1da177e4 LT |
869 | } |
870 | ||
e73aec82 | 871 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1da177e4 | 872 | { |
1da177e4 | 873 | int retries, res; |
e73aec82 | 874 | struct scsi_device *sdp = sdkp->device; |
ea73a9f2 | 875 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
876 | |
877 | if (!scsi_device_online(sdp)) | |
878 | return -ENODEV; | |
879 | ||
1da177e4 | 880 | |
1da177e4 LT |
881 | for (retries = 3; retries > 0; --retries) { |
882 | unsigned char cmd[10] = { 0 }; | |
883 | ||
884 | cmd[0] = SYNCHRONIZE_CACHE; | |
885 | /* | |
886 | * Leave the rest of the command zero to indicate | |
887 | * flush everything. | |
888 | */ | |
ea73a9f2 | 889 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
f4f4e47e | 890 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
ea73a9f2 | 891 | if (res == 0) |
1da177e4 LT |
892 | break; |
893 | } | |
894 | ||
e73aec82 MP |
895 | if (res) { |
896 | sd_print_result(sdkp, res); | |
897 | if (driver_byte(res) & DRIVER_SENSE) | |
898 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
899 | } |
900 | ||
3721050a TH |
901 | if (res) |
902 | return -EIO; | |
903 | return 0; | |
1da177e4 LT |
904 | } |
905 | ||
165125e1 | 906 | static void sd_prepare_flush(struct request_queue *q, struct request *rq) |
1da177e4 | 907 | { |
4aff5e23 | 908 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
c0ed79a3 JB |
909 | rq->timeout = SD_TIMEOUT; |
910 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
461d4e90 | 911 | rq->cmd_len = 10; |
1da177e4 LT |
912 | } |
913 | ||
914 | static void sd_rescan(struct device *dev) | |
915 | { | |
39b7f1e2 AS |
916 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
917 | ||
918 | if (sdkp) { | |
f98a8cae | 919 | revalidate_disk(sdkp->disk); |
39b7f1e2 AS |
920 | scsi_disk_put(sdkp); |
921 | } | |
1da177e4 LT |
922 | } |
923 | ||
924 | ||
925 | #ifdef CONFIG_COMPAT | |
926 | /* | |
927 | * This gets directly called from VFS. When the ioctl | |
928 | * is not recognized we go back to the other translation paths. | |
929 | */ | |
0338e291 AV |
930 | static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
931 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 932 | { |
0338e291 | 933 | struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; |
1da177e4 LT |
934 | |
935 | /* | |
936 | * If we are in the middle of error recovery, don't let anyone | |
937 | * else try and use this device. Also, if error recovery fails, it | |
938 | * may try and take the device offline, in which case all further | |
939 | * access to the device is prohibited. | |
940 | */ | |
941 | if (!scsi_block_when_processing_errors(sdev)) | |
942 | return -ENODEV; | |
943 | ||
944 | if (sdev->host->hostt->compat_ioctl) { | |
945 | int ret; | |
946 | ||
947 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
948 | ||
949 | return ret; | |
950 | } | |
951 | ||
952 | /* | |
953 | * Let the static ioctl translation table take care of it. | |
954 | */ | |
955 | return -ENOIOCTLCMD; | |
956 | } | |
957 | #endif | |
958 | ||
959 | static struct block_device_operations sd_fops = { | |
960 | .owner = THIS_MODULE, | |
0338e291 AV |
961 | .open = sd_open, |
962 | .release = sd_release, | |
963 | .locked_ioctl = sd_ioctl, | |
a885c8c4 | 964 | .getgeo = sd_getgeo, |
1da177e4 | 965 | #ifdef CONFIG_COMPAT |
0338e291 | 966 | .compat_ioctl = sd_compat_ioctl, |
1da177e4 LT |
967 | #endif |
968 | .media_changed = sd_media_changed, | |
969 | .revalidate_disk = sd_revalidate_disk, | |
970 | }; | |
971 | ||
af55ff67 MP |
972 | static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd) |
973 | { | |
83096ebf TH |
974 | u64 start_lba = blk_rq_pos(scmd->request); |
975 | u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512); | |
af55ff67 MP |
976 | u64 bad_lba; |
977 | int info_valid; | |
978 | ||
979 | if (!blk_fs_request(scmd->request)) | |
980 | return 0; | |
981 | ||
982 | info_valid = scsi_get_sense_info_fld(scmd->sense_buffer, | |
983 | SCSI_SENSE_BUFFERSIZE, | |
984 | &bad_lba); | |
985 | if (!info_valid) | |
986 | return 0; | |
987 | ||
988 | if (scsi_bufflen(scmd) <= scmd->device->sector_size) | |
989 | return 0; | |
990 | ||
991 | if (scmd->device->sector_size < 512) { | |
992 | /* only legitimate sector_size here is 256 */ | |
993 | start_lba <<= 1; | |
994 | end_lba <<= 1; | |
995 | } else { | |
996 | /* be careful ... don't want any overflows */ | |
997 | u64 factor = scmd->device->sector_size / 512; | |
998 | do_div(start_lba, factor); | |
999 | do_div(end_lba, factor); | |
1000 | } | |
1001 | ||
1002 | /* The bad lba was reported incorrectly, we have no idea where | |
1003 | * the error is. | |
1004 | */ | |
1005 | if (bad_lba < start_lba || bad_lba >= end_lba) | |
1006 | return 0; | |
1007 | ||
1008 | /* This computation should always be done in terms of | |
1009 | * the resolution of the device's medium. | |
1010 | */ | |
1011 | return (bad_lba - start_lba) * scmd->device->sector_size; | |
1012 | } | |
1013 | ||
1da177e4 | 1014 | /** |
7b3d9545 | 1015 | * sd_done - bottom half handler: called when the lower level |
1da177e4 LT |
1016 | * driver has completed (successfully or otherwise) a scsi command. |
1017 | * @SCpnt: mid-level's per command structure. | |
1018 | * | |
1019 | * Note: potentially run from within an ISR. Must not block. | |
1020 | **/ | |
7b3d9545 | 1021 | static int sd_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
1022 | { |
1023 | int result = SCpnt->result; | |
af55ff67 | 1024 | unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); |
1da177e4 LT |
1025 | struct scsi_sense_hdr sshdr; |
1026 | int sense_valid = 0; | |
1027 | int sense_deferred = 0; | |
1da177e4 LT |
1028 | |
1029 | if (result) { | |
1030 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
1031 | if (sense_valid) | |
1032 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
1033 | } | |
1da177e4 | 1034 | #ifdef CONFIG_SCSI_LOGGING |
fa0d34be | 1035 | SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
1da177e4 | 1036 | if (sense_valid) { |
fa0d34be | 1037 | SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
7b3d9545 | 1038 | "sd_done: sb[respc,sk,asc," |
fa0d34be MP |
1039 | "ascq]=%x,%x,%x,%x\n", |
1040 | sshdr.response_code, | |
1041 | sshdr.sense_key, sshdr.asc, | |
1042 | sshdr.ascq)); | |
1da177e4 LT |
1043 | } |
1044 | #endif | |
03aba2f7 LT |
1045 | if (driver_byte(result) != DRIVER_SENSE && |
1046 | (!sense_valid || sense_deferred)) | |
1047 | goto out; | |
1048 | ||
1049 | switch (sshdr.sense_key) { | |
1050 | case HARDWARE_ERROR: | |
1051 | case MEDIUM_ERROR: | |
af55ff67 | 1052 | good_bytes = sd_completed_bytes(SCpnt); |
03aba2f7 LT |
1053 | break; |
1054 | case RECOVERED_ERROR: | |
af55ff67 MP |
1055 | good_bytes = scsi_bufflen(SCpnt); |
1056 | break; | |
10dab226 JW |
1057 | case NO_SENSE: |
1058 | /* This indicates a false check condition, so ignore it. An | |
1059 | * unknown amount of data was transferred so treat it as an | |
1060 | * error. | |
1061 | */ | |
1062 | scsi_print_sense("sd", SCpnt); | |
1063 | SCpnt->result = 0; | |
1064 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
1065 | break; | |
af55ff67 MP |
1066 | case ABORTED_COMMAND: |
1067 | if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */ | |
1068 | scsi_print_result(SCpnt); | |
1069 | scsi_print_sense("sd", SCpnt); | |
1070 | good_bytes = sd_completed_bytes(SCpnt); | |
1071 | } | |
03aba2f7 LT |
1072 | break; |
1073 | case ILLEGAL_REQUEST: | |
af55ff67 MP |
1074 | if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */ |
1075 | scsi_print_result(SCpnt); | |
1076 | scsi_print_sense("sd", SCpnt); | |
1077 | good_bytes = sd_completed_bytes(SCpnt); | |
1078 | } | |
03aba2f7 LT |
1079 | break; |
1080 | default: | |
1081 | break; | |
1da177e4 | 1082 | } |
03aba2f7 | 1083 | out: |
af55ff67 MP |
1084 | if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) |
1085 | sd_dif_complete(SCpnt, good_bytes); | |
1086 | ||
7b3d9545 | 1087 | return good_bytes; |
1da177e4 LT |
1088 | } |
1089 | ||
ea73a9f2 JB |
1090 | static int media_not_present(struct scsi_disk *sdkp, |
1091 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1092 | { |
1da177e4 | 1093 | |
ea73a9f2 | 1094 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
1095 | return 0; |
1096 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
1097 | if (sshdr->sense_key != NOT_READY && |
1098 | sshdr->sense_key != UNIT_ATTENTION) | |
1099 | return 0; | |
1100 | if (sshdr->asc != 0x3A) /* medium not present */ | |
1101 | return 0; | |
1102 | ||
1da177e4 LT |
1103 | set_media_not_present(sdkp); |
1104 | return 1; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * spinup disk - called only in sd_revalidate_disk() | |
1109 | */ | |
1110 | static void | |
e73aec82 | 1111 | sd_spinup_disk(struct scsi_disk *sdkp) |
ea73a9f2 | 1112 | { |
1da177e4 | 1113 | unsigned char cmd[10]; |
4451e472 | 1114 | unsigned long spintime_expire = 0; |
1da177e4 LT |
1115 | int retries, spintime; |
1116 | unsigned int the_result; | |
1117 | struct scsi_sense_hdr sshdr; | |
1118 | int sense_valid = 0; | |
1119 | ||
1120 | spintime = 0; | |
1121 | ||
1122 | /* Spin up drives, as required. Only do this at boot time */ | |
1123 | /* Spinup needs to be done for module loads too. */ | |
1124 | do { | |
1125 | retries = 0; | |
1126 | ||
1127 | do { | |
1128 | cmd[0] = TEST_UNIT_READY; | |
1129 | memset((void *) &cmd[1], 0, 9); | |
1130 | ||
ea73a9f2 JB |
1131 | the_result = scsi_execute_req(sdkp->device, cmd, |
1132 | DMA_NONE, NULL, 0, | |
1133 | &sshdr, SD_TIMEOUT, | |
f4f4e47e | 1134 | SD_MAX_RETRIES, NULL); |
1da177e4 | 1135 | |
b4d38e38 AS |
1136 | /* |
1137 | * If the drive has indicated to us that it | |
1138 | * doesn't have any media in it, don't bother | |
1139 | * with any more polling. | |
1140 | */ | |
1141 | if (media_not_present(sdkp, &sshdr)) | |
1142 | return; | |
1143 | ||
1da177e4 | 1144 | if (the_result) |
ea73a9f2 | 1145 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1146 | retries++; |
1147 | } while (retries < 3 && | |
1148 | (!scsi_status_is_good(the_result) || | |
1149 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1150 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1151 | ||
1da177e4 LT |
1152 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1153 | /* no sense, TUR either succeeded or failed | |
1154 | * with a status error */ | |
e73aec82 MP |
1155 | if(!spintime && !scsi_status_is_good(the_result)) { |
1156 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); | |
1157 | sd_print_result(sdkp, the_result); | |
1158 | } | |
1da177e4 LT |
1159 | break; |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * The device does not want the automatic start to be issued. | |
1164 | */ | |
33dd6f92 | 1165 | if (sdkp->device->no_start_on_add) |
1da177e4 | 1166 | break; |
1da177e4 | 1167 | |
33dd6f92 MW |
1168 | if (sense_valid && sshdr.sense_key == NOT_READY) { |
1169 | if (sshdr.asc == 4 && sshdr.ascq == 3) | |
1170 | break; /* manual intervention required */ | |
1171 | if (sshdr.asc == 4 && sshdr.ascq == 0xb) | |
1172 | break; /* standby */ | |
1173 | if (sshdr.asc == 4 && sshdr.ascq == 0xc) | |
1174 | break; /* unavailable */ | |
1175 | /* | |
1176 | * Issue command to spin up drive when not ready | |
1177 | */ | |
1da177e4 | 1178 | if (!spintime) { |
e73aec82 | 1179 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1da177e4 LT |
1180 | cmd[0] = START_STOP; |
1181 | cmd[1] = 1; /* Return immediately */ | |
1182 | memset((void *) &cmd[2], 0, 8); | |
1183 | cmd[4] = 1; /* Start spin cycle */ | |
d2886ea3 SR |
1184 | if (sdkp->device->start_stop_pwr_cond) |
1185 | cmd[4] |= 1 << 4; | |
ea73a9f2 JB |
1186 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1187 | NULL, 0, &sshdr, | |
f4f4e47e FT |
1188 | SD_TIMEOUT, SD_MAX_RETRIES, |
1189 | NULL); | |
4451e472 AS |
1190 | spintime_expire = jiffies + 100 * HZ; |
1191 | spintime = 1; | |
1da177e4 | 1192 | } |
1da177e4 LT |
1193 | /* Wait 1 second for next try */ |
1194 | msleep(1000); | |
1195 | printk("."); | |
4451e472 AS |
1196 | |
1197 | /* | |
1198 | * Wait for USB flash devices with slow firmware. | |
1199 | * Yes, this sense key/ASC combination shouldn't | |
1200 | * occur here. It's characteristic of these devices. | |
1201 | */ | |
1202 | } else if (sense_valid && | |
1203 | sshdr.sense_key == UNIT_ATTENTION && | |
1204 | sshdr.asc == 0x28) { | |
1205 | if (!spintime) { | |
1206 | spintime_expire = jiffies + 5 * HZ; | |
1207 | spintime = 1; | |
1208 | } | |
1209 | /* Wait 1 second for next try */ | |
1210 | msleep(1000); | |
1da177e4 LT |
1211 | } else { |
1212 | /* we don't understand the sense code, so it's | |
1213 | * probably pointless to loop */ | |
1214 | if(!spintime) { | |
e73aec82 MP |
1215 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1216 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1217 | } |
1218 | break; | |
1219 | } | |
1220 | ||
4451e472 | 1221 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1222 | |
1223 | if (spintime) { | |
1224 | if (scsi_status_is_good(the_result)) | |
1225 | printk("ready\n"); | |
1226 | else | |
1227 | printk("not responding...\n"); | |
1228 | } | |
1229 | } | |
1230 | ||
e0597d70 MP |
1231 | |
1232 | /* | |
1233 | * Determine whether disk supports Data Integrity Field. | |
1234 | */ | |
1235 | void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) | |
1236 | { | |
1237 | struct scsi_device *sdp = sdkp->device; | |
1238 | u8 type; | |
1239 | ||
1240 | if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) | |
1241 | type = 0; | |
1242 | else | |
1243 | type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ | |
1244 | ||
be922f47 MP |
1245 | sdkp->protection_type = type; |
1246 | ||
e0597d70 MP |
1247 | switch (type) { |
1248 | case SD_DIF_TYPE0_PROTECTION: | |
e0597d70 MP |
1249 | case SD_DIF_TYPE1_PROTECTION: |
1250 | case SD_DIF_TYPE3_PROTECTION: | |
e0597d70 MP |
1251 | break; |
1252 | ||
1253 | case SD_DIF_TYPE2_PROTECTION: | |
1254 | sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \ | |
1255 | "protection which is currently unsupported. " \ | |
1256 | "Disabling disk!\n"); | |
1257 | goto disable; | |
1258 | ||
1259 | default: | |
1260 | sd_printk(KERN_ERR, sdkp, "formatted with unknown " \ | |
1261 | "protection type %d. Disabling disk!\n", type); | |
1262 | goto disable; | |
1263 | } | |
1264 | ||
1265 | return; | |
1266 | ||
1267 | disable: | |
e0597d70 MP |
1268 | sdkp->capacity = 0; |
1269 | } | |
1270 | ||
0da205e0 MW |
1271 | static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, |
1272 | struct scsi_sense_hdr *sshdr, int sense_valid, | |
1273 | int the_result) | |
1274 | { | |
1275 | sd_print_result(sdkp, the_result); | |
1276 | if (driver_byte(the_result) & DRIVER_SENSE) | |
1277 | sd_print_sense_hdr(sdkp, sshdr); | |
1278 | else | |
1279 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); | |
1280 | ||
1281 | /* | |
1282 | * Set dirty bit for removable devices if not ready - | |
1283 | * sometimes drives will not report this properly. | |
1284 | */ | |
1285 | if (sdp->removable && | |
1286 | sense_valid && sshdr->sense_key == NOT_READY) | |
1287 | sdp->changed = 1; | |
1288 | ||
1289 | /* | |
1290 | * We used to set media_present to 0 here to indicate no media | |
1291 | * in the drive, but some drives fail read capacity even with | |
1292 | * media present, so we can't do that. | |
1293 | */ | |
1294 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ | |
1295 | } | |
1296 | ||
1297 | #define RC16_LEN 32 | |
1298 | #if RC16_LEN > SD_BUF_SIZE | |
1299 | #error RC16_LEN must not be more than SD_BUF_SIZE | |
1300 | #endif | |
1301 | ||
1302 | static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, | |
1303 | unsigned char *buffer) | |
ea73a9f2 | 1304 | { |
1da177e4 | 1305 | unsigned char cmd[16]; |
1da177e4 LT |
1306 | struct scsi_sense_hdr sshdr; |
1307 | int sense_valid = 0; | |
0da205e0 MW |
1308 | int the_result; |
1309 | int retries = 3; | |
ea09bcc9 | 1310 | unsigned int alignment; |
0da205e0 MW |
1311 | unsigned long long lba; |
1312 | unsigned sector_size; | |
1da177e4 | 1313 | |
1da177e4 | 1314 | do { |
0da205e0 MW |
1315 | memset(cmd, 0, 16); |
1316 | cmd[0] = SERVICE_ACTION_IN; | |
1317 | cmd[1] = SAI_READ_CAPACITY_16; | |
1318 | cmd[13] = RC16_LEN; | |
1319 | memset(buffer, 0, RC16_LEN); | |
1320 | ||
ea73a9f2 | 1321 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
0da205e0 MW |
1322 | buffer, RC16_LEN, &sshdr, |
1323 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); | |
1da177e4 | 1324 | |
ea73a9f2 | 1325 | if (media_not_present(sdkp, &sshdr)) |
0da205e0 | 1326 | return -ENODEV; |
1da177e4 | 1327 | |
2b301307 | 1328 | if (the_result) { |
ea73a9f2 | 1329 | sense_valid = scsi_sense_valid(&sshdr); |
2b301307 MW |
1330 | if (sense_valid && |
1331 | sshdr.sense_key == ILLEGAL_REQUEST && | |
1332 | (sshdr.asc == 0x20 || sshdr.asc == 0x24) && | |
1333 | sshdr.ascq == 0x00) | |
1334 | /* Invalid Command Operation Code or | |
1335 | * Invalid Field in CDB, just retry | |
1336 | * silently with RC10 */ | |
1337 | return -EINVAL; | |
1338 | } | |
1da177e4 LT |
1339 | retries--; |
1340 | ||
1341 | } while (the_result && retries); | |
1342 | ||
0da205e0 | 1343 | if (the_result) { |
e73aec82 | 1344 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
0da205e0 MW |
1345 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); |
1346 | return -EINVAL; | |
1347 | } | |
e73aec82 | 1348 | |
8f76d151 DH |
1349 | sector_size = get_unaligned_be32(&buffer[8]); |
1350 | lba = get_unaligned_be64(&buffer[0]); | |
0da205e0 MW |
1351 | |
1352 | sd_read_protection_type(sdkp, buffer); | |
1353 | ||
1354 | if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) { | |
1355 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " | |
1356 | "kernel compiled with support for large block " | |
1357 | "devices.\n"); | |
1358 | sdkp->capacity = 0; | |
1359 | return -EOVERFLOW; | |
1360 | } | |
1361 | ||
ea09bcc9 MP |
1362 | /* Logical blocks per physical block exponent */ |
1363 | sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size; | |
1364 | ||
1365 | /* Lowest aligned logical block */ | |
1366 | alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size; | |
1367 | blk_queue_alignment_offset(sdp->request_queue, alignment); | |
1368 | if (alignment && sdkp->first_scan) | |
1369 | sd_printk(KERN_NOTICE, sdkp, | |
1370 | "physical block alignment offset: %u\n", alignment); | |
1371 | ||
0da205e0 MW |
1372 | sdkp->capacity = lba + 1; |
1373 | return sector_size; | |
1374 | } | |
1375 | ||
1376 | static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, | |
1377 | unsigned char *buffer) | |
1378 | { | |
1379 | unsigned char cmd[16]; | |
1380 | struct scsi_sense_hdr sshdr; | |
1381 | int sense_valid = 0; | |
1382 | int the_result; | |
1383 | int retries = 3; | |
1384 | sector_t lba; | |
1385 | unsigned sector_size; | |
1386 | ||
1387 | do { | |
1388 | cmd[0] = READ_CAPACITY; | |
1389 | memset(&cmd[1], 0, 9); | |
1390 | memset(buffer, 0, 8); | |
1391 | ||
1392 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, | |
1393 | buffer, 8, &sshdr, | |
1394 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); | |
1395 | ||
1396 | if (media_not_present(sdkp, &sshdr)) | |
1397 | return -ENODEV; | |
1398 | ||
1399 | if (the_result) | |
1400 | sense_valid = scsi_sense_valid(&sshdr); | |
1401 | retries--; | |
1402 | ||
1403 | } while (the_result && retries); | |
1404 | ||
1405 | if (the_result) { | |
1406 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); | |
1407 | read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result); | |
1408 | return -EINVAL; | |
1409 | } | |
1410 | ||
8f76d151 DH |
1411 | sector_size = get_unaligned_be32(&buffer[4]); |
1412 | lba = get_unaligned_be32(&buffer[0]); | |
0da205e0 MW |
1413 | |
1414 | if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { | |
1415 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " | |
1416 | "kernel compiled with support for large block " | |
1417 | "devices.\n"); | |
1418 | sdkp->capacity = 0; | |
1419 | return -EOVERFLOW; | |
1420 | } | |
1421 | ||
1422 | sdkp->capacity = lba + 1; | |
ea09bcc9 | 1423 | sdkp->hw_sector_size = sector_size; |
0da205e0 MW |
1424 | return sector_size; |
1425 | } | |
1426 | ||
2b301307 MW |
1427 | static int sd_try_rc16_first(struct scsi_device *sdp) |
1428 | { | |
1429 | if (sdp->scsi_level > SCSI_SPC_2) | |
1430 | return 1; | |
1431 | if (scsi_device_protection(sdp)) | |
1432 | return 1; | |
1433 | return 0; | |
1434 | } | |
1435 | ||
0da205e0 MW |
1436 | /* |
1437 | * read disk capacity | |
1438 | */ | |
1439 | static void | |
1440 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) | |
1441 | { | |
1442 | int sector_size; | |
1443 | struct scsi_device *sdp = sdkp->device; | |
70a9b873 | 1444 | sector_t old_capacity = sdkp->capacity; |
0da205e0 | 1445 | |
2b301307 | 1446 | if (sd_try_rc16_first(sdp)) { |
0da205e0 MW |
1447 | sector_size = read_capacity_16(sdkp, sdp, buffer); |
1448 | if (sector_size == -EOVERFLOW) | |
1da177e4 | 1449 | goto got_data; |
2b301307 MW |
1450 | if (sector_size == -ENODEV) |
1451 | return; | |
1452 | if (sector_size < 0) | |
1453 | sector_size = read_capacity_10(sdkp, sdp, buffer); | |
0da205e0 MW |
1454 | if (sector_size < 0) |
1455 | return; | |
1da177e4 | 1456 | } else { |
0da205e0 MW |
1457 | sector_size = read_capacity_10(sdkp, sdp, buffer); |
1458 | if (sector_size == -EOVERFLOW) | |
1459 | goto got_data; | |
1460 | if (sector_size < 0) | |
1461 | return; | |
1462 | if ((sizeof(sdkp->capacity) > 4) && | |
1463 | (sdkp->capacity > 0xffffffffULL)) { | |
1464 | int old_sector_size = sector_size; | |
1465 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " | |
1466 | "Trying to use READ CAPACITY(16).\n"); | |
1467 | sector_size = read_capacity_16(sdkp, sdp, buffer); | |
1468 | if (sector_size < 0) { | |
1469 | sd_printk(KERN_NOTICE, sdkp, | |
1470 | "Using 0xffffffff as device size\n"); | |
1471 | sdkp->capacity = 1 + (sector_t) 0xffffffff; | |
1472 | sector_size = old_sector_size; | |
1473 | goto got_data; | |
1474 | } | |
1475 | } | |
1476 | } | |
1da177e4 | 1477 | |
5c211caa AS |
1478 | /* Some devices are known to return the total number of blocks, |
1479 | * not the highest block number. Some devices have versions | |
1480 | * which do this and others which do not. Some devices we might | |
1481 | * suspect of doing this but we don't know for certain. | |
1482 | * | |
1483 | * If we know the reported capacity is wrong, decrement it. If | |
1484 | * we can only guess, then assume the number of blocks is even | |
1485 | * (usually true but not always) and err on the side of lowering | |
1486 | * the capacity. | |
1487 | */ | |
1488 | if (sdp->fix_capacity || | |
1489 | (sdp->guess_capacity && (sdkp->capacity & 0x01))) { | |
1490 | sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " | |
1491 | "from its reported value: %llu\n", | |
1492 | (unsigned long long) sdkp->capacity); | |
1da177e4 | 1493 | --sdkp->capacity; |
61bf54b7 ON |
1494 | } |
1495 | ||
1da177e4 LT |
1496 | got_data: |
1497 | if (sector_size == 0) { | |
1498 | sector_size = 512; | |
e73aec82 MP |
1499 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
1500 | "assuming 512.\n"); | |
1da177e4 LT |
1501 | } |
1502 | ||
1503 | if (sector_size != 512 && | |
1504 | sector_size != 1024 && | |
1505 | sector_size != 2048 && | |
1506 | sector_size != 4096 && | |
1507 | sector_size != 256) { | |
e73aec82 MP |
1508 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
1509 | sector_size); | |
1da177e4 LT |
1510 | /* |
1511 | * The user might want to re-format the drive with | |
1512 | * a supported sectorsize. Once this happens, it | |
1513 | * would be relatively trivial to set the thing up. | |
1514 | * For this reason, we leave the thing in the table. | |
1515 | */ | |
1516 | sdkp->capacity = 0; | |
1517 | /* | |
1518 | * set a bogus sector size so the normal read/write | |
1519 | * logic in the block layer will eventually refuse any | |
1520 | * request on this device without tripping over power | |
1521 | * of two sector size assumptions | |
1522 | */ | |
1523 | sector_size = 512; | |
1524 | } | |
e1defc4f | 1525 | blk_queue_logical_block_size(sdp->request_queue, sector_size); |
7404ad3b | 1526 | |
1da177e4 | 1527 | { |
7404ad3b | 1528 | char cap_str_2[10], cap_str_10[10]; |
520a2c27 | 1529 | u64 sz = (u64)sdkp->capacity << ilog2(sector_size); |
1da177e4 | 1530 | |
7404ad3b JB |
1531 | string_get_size(sz, STRING_UNITS_2, cap_str_2, |
1532 | sizeof(cap_str_2)); | |
1533 | string_get_size(sz, STRING_UNITS_10, cap_str_10, | |
1534 | sizeof(cap_str_10)); | |
1da177e4 | 1535 | |
ea09bcc9 | 1536 | if (sdkp->first_scan || old_capacity != sdkp->capacity) { |
70a9b873 | 1537 | sd_printk(KERN_NOTICE, sdkp, |
ea09bcc9 | 1538 | "%llu %d-byte logical blocks: (%s/%s)\n", |
70a9b873 MP |
1539 | (unsigned long long)sdkp->capacity, |
1540 | sector_size, cap_str_10, cap_str_2); | |
ea09bcc9 MP |
1541 | |
1542 | if (sdkp->hw_sector_size != sector_size) | |
1543 | sd_printk(KERN_NOTICE, sdkp, | |
1544 | "%u-byte physical blocks\n", | |
1545 | sdkp->hw_sector_size); | |
1546 | } | |
1da177e4 LT |
1547 | } |
1548 | ||
1549 | /* Rescale capacity to 512-byte units */ | |
1550 | if (sector_size == 4096) | |
1551 | sdkp->capacity <<= 3; | |
1552 | else if (sector_size == 2048) | |
1553 | sdkp->capacity <<= 2; | |
1554 | else if (sector_size == 1024) | |
1555 | sdkp->capacity <<= 1; | |
1556 | else if (sector_size == 256) | |
1557 | sdkp->capacity >>= 1; | |
1558 | ||
ea09bcc9 | 1559 | blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size); |
1da177e4 LT |
1560 | sdkp->device->sector_size = sector_size; |
1561 | } | |
1562 | ||
1563 | /* called with buffer of length 512 */ | |
1564 | static inline int | |
ea73a9f2 JB |
1565 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1566 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1567 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1568 | { |
ea73a9f2 | 1569 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1570 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1571 | sshdr); |
1da177e4 LT |
1572 | } |
1573 | ||
1574 | /* | |
1575 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1576 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1577 | */ |
1578 | static void | |
e73aec82 | 1579 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1580 | { |
1da177e4 | 1581 | int res; |
ea73a9f2 | 1582 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1583 | struct scsi_mode_data data; |
70a9b873 | 1584 | int old_wp = sdkp->write_prot; |
1da177e4 LT |
1585 | |
1586 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1587 | if (sdp->skip_ms_page_3f) { |
e73aec82 | 1588 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
1da177e4 LT |
1589 | return; |
1590 | } | |
1591 | ||
ea73a9f2 JB |
1592 | if (sdp->use_192_bytes_for_3f) { |
1593 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1594 | } else { |
1595 | /* | |
1596 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1597 | * We have to start carefully: some devices hang if we ask | |
1598 | * for more than is available. | |
1599 | */ | |
ea73a9f2 | 1600 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1601 | |
1602 | /* | |
1603 | * Second attempt: ask for page 0 When only page 0 is | |
1604 | * implemented, a request for page 3F may return Sense Key | |
1605 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1606 | * CDB. | |
1607 | */ | |
1608 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1609 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1610 | |
1611 | /* | |
1612 | * Third attempt: ask 255 bytes, as we did earlier. | |
1613 | */ | |
1614 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1615 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1616 | &data, NULL); | |
1da177e4 LT |
1617 | } |
1618 | ||
1619 | if (!scsi_status_is_good(res)) { | |
e73aec82 MP |
1620 | sd_printk(KERN_WARNING, sdkp, |
1621 | "Test WP failed, assume Write Enabled\n"); | |
1da177e4 LT |
1622 | } else { |
1623 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1624 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
70a9b873 MP |
1625 | if (sdkp->first_scan || old_wp != sdkp->write_prot) { |
1626 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", | |
1627 | sdkp->write_prot ? "on" : "off"); | |
1628 | sd_printk(KERN_DEBUG, sdkp, | |
1629 | "Mode Sense: %02x %02x %02x %02x\n", | |
1630 | buffer[0], buffer[1], buffer[2], buffer[3]); | |
1631 | } | |
1da177e4 LT |
1632 | } |
1633 | } | |
1634 | ||
1635 | /* | |
1636 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1637 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1638 | */ |
1639 | static void | |
e73aec82 | 1640 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
631e8a13 | 1641 | { |
1da177e4 | 1642 | int len = 0, res; |
ea73a9f2 | 1643 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1644 | |
631e8a13 AV |
1645 | int dbd; |
1646 | int modepage; | |
1da177e4 LT |
1647 | struct scsi_mode_data data; |
1648 | struct scsi_sense_hdr sshdr; | |
70a9b873 MP |
1649 | int old_wce = sdkp->WCE; |
1650 | int old_rcd = sdkp->RCD; | |
1651 | int old_dpofua = sdkp->DPOFUA; | |
1da177e4 | 1652 | |
ea73a9f2 | 1653 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1654 | goto defaults; |
1655 | ||
ea73a9f2 | 1656 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1657 | modepage = 6; |
1658 | dbd = 8; | |
1659 | } else { | |
1660 | modepage = 8; | |
1661 | dbd = 0; | |
1662 | } | |
1663 | ||
1da177e4 | 1664 | /* cautiously ask */ |
ea73a9f2 | 1665 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1666 | |
1667 | if (!scsi_status_is_good(res)) | |
1668 | goto bad_sense; | |
1669 | ||
6d73c851 AV |
1670 | if (!data.header_length) { |
1671 | modepage = 6; | |
e73aec82 | 1672 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
6d73c851 AV |
1673 | } |
1674 | ||
1da177e4 LT |
1675 | /* that went OK, now ask for the proper length */ |
1676 | len = data.length; | |
1677 | ||
1678 | /* | |
1679 | * We're only interested in the first three bytes, actually. | |
1680 | * But the data cache page is defined for the first 20. | |
1681 | */ | |
1682 | if (len < 3) | |
1683 | goto bad_sense; | |
1684 | if (len > 20) | |
1685 | len = 20; | |
1686 | ||
1687 | /* Take headers and block descriptors into account */ | |
1688 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1689 | if (len > SD_BUF_SIZE) |
1690 | goto bad_sense; | |
1da177e4 LT |
1691 | |
1692 | /* Get the data */ | |
ea73a9f2 | 1693 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1694 | |
1695 | if (scsi_status_is_good(res)) { | |
631e8a13 | 1696 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1697 | |
48970800 | 1698 | if (offset >= SD_BUF_SIZE - 2) { |
e73aec82 | 1699 | sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); |
48970800 AV |
1700 | goto defaults; |
1701 | } | |
1702 | ||
631e8a13 | 1703 | if ((buffer[offset] & 0x3f) != modepage) { |
e73aec82 | 1704 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
631e8a13 AV |
1705 | goto defaults; |
1706 | } | |
1707 | ||
1708 | if (modepage == 8) { | |
1709 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1710 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1711 | } else { | |
1712 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1713 | sdkp->RCD = 0; | |
1714 | } | |
1da177e4 | 1715 | |
007365ad TH |
1716 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1717 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
e73aec82 MP |
1718 | sd_printk(KERN_NOTICE, sdkp, |
1719 | "Uses READ/WRITE(6), disabling FUA\n"); | |
007365ad TH |
1720 | sdkp->DPOFUA = 0; |
1721 | } | |
1722 | ||
70a9b873 MP |
1723 | if (sdkp->first_scan || old_wce != sdkp->WCE || |
1724 | old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA) | |
1725 | sd_printk(KERN_NOTICE, sdkp, | |
1726 | "Write cache: %s, read cache: %s, %s\n", | |
1727 | sdkp->WCE ? "enabled" : "disabled", | |
1728 | sdkp->RCD ? "disabled" : "enabled", | |
1729 | sdkp->DPOFUA ? "supports DPO and FUA" | |
1730 | : "doesn't support DPO or FUA"); | |
1da177e4 LT |
1731 | |
1732 | return; | |
1733 | } | |
1734 | ||
1735 | bad_sense: | |
ea73a9f2 | 1736 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1737 | sshdr.sense_key == ILLEGAL_REQUEST && |
1738 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
e73aec82 MP |
1739 | /* Invalid field in CDB */ |
1740 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); | |
1da177e4 | 1741 | else |
e73aec82 | 1742 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
1da177e4 LT |
1743 | |
1744 | defaults: | |
e73aec82 | 1745 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); |
1da177e4 LT |
1746 | sdkp->WCE = 0; |
1747 | sdkp->RCD = 0; | |
48970800 | 1748 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1749 | } |
1750 | ||
e0597d70 MP |
1751 | /* |
1752 | * The ATO bit indicates whether the DIF application tag is available | |
1753 | * for use by the operating system. | |
1754 | */ | |
1755 | void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) | |
1756 | { | |
1757 | int res, offset; | |
1758 | struct scsi_device *sdp = sdkp->device; | |
1759 | struct scsi_mode_data data; | |
1760 | struct scsi_sense_hdr sshdr; | |
1761 | ||
1762 | if (sdp->type != TYPE_DISK) | |
1763 | return; | |
1764 | ||
1765 | if (sdkp->protection_type == 0) | |
1766 | return; | |
1767 | ||
1768 | res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, | |
1769 | SD_MAX_RETRIES, &data, &sshdr); | |
1770 | ||
1771 | if (!scsi_status_is_good(res) || !data.header_length || | |
1772 | data.length < 6) { | |
1773 | sd_printk(KERN_WARNING, sdkp, | |
1774 | "getting Control mode page failed, assume no ATO\n"); | |
1775 | ||
1776 | if (scsi_sense_valid(&sshdr)) | |
1777 | sd_print_sense_hdr(sdkp, &sshdr); | |
1778 | ||
1779 | return; | |
1780 | } | |
1781 | ||
1782 | offset = data.header_length + data.block_descriptor_length; | |
1783 | ||
1784 | if ((buffer[offset] & 0x3f) != 0x0a) { | |
1785 | sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); | |
1786 | return; | |
1787 | } | |
1788 | ||
1789 | if ((buffer[offset + 5] & 0x80) == 0) | |
1790 | return; | |
1791 | ||
1792 | sdkp->ATO = 1; | |
1793 | ||
1794 | return; | |
1795 | } | |
1796 | ||
d11b6916 MP |
1797 | /** |
1798 | * sd_read_block_limits - Query disk device for preferred I/O sizes. | |
1799 | * @disk: disk to query | |
1800 | */ | |
1801 | static void sd_read_block_limits(struct scsi_disk *sdkp) | |
1802 | { | |
1803 | unsigned int sector_sz = sdkp->device->sector_size; | |
1804 | char *buffer; | |
1805 | ||
1806 | /* Block Limits VPD */ | |
1807 | buffer = scsi_get_vpd_page(sdkp->device, 0xb0); | |
1808 | ||
1809 | if (buffer == NULL) | |
1810 | return; | |
1811 | ||
1812 | blk_queue_io_min(sdkp->disk->queue, | |
1813 | get_unaligned_be16(&buffer[6]) * sector_sz); | |
1814 | blk_queue_io_opt(sdkp->disk->queue, | |
1815 | get_unaligned_be32(&buffer[12]) * sector_sz); | |
1816 | ||
1817 | kfree(buffer); | |
1818 | } | |
1819 | ||
3821d768 MP |
1820 | /** |
1821 | * sd_read_block_characteristics - Query block dev. characteristics | |
1822 | * @disk: disk to query | |
1823 | */ | |
1824 | static void sd_read_block_characteristics(struct scsi_disk *sdkp) | |
1825 | { | |
1826 | char *buffer; | |
1827 | u16 rot; | |
1828 | ||
1829 | /* Block Device Characteristics VPD */ | |
1830 | buffer = scsi_get_vpd_page(sdkp->device, 0xb1); | |
1831 | ||
1832 | if (buffer == NULL) | |
1833 | return; | |
1834 | ||
1835 | rot = get_unaligned_be16(&buffer[4]); | |
1836 | ||
1837 | if (rot == 1) | |
1838 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue); | |
1839 | ||
1840 | kfree(buffer); | |
1841 | } | |
1842 | ||
ffd4bc2a MP |
1843 | static int sd_try_extended_inquiry(struct scsi_device *sdp) |
1844 | { | |
1845 | /* | |
1846 | * Although VPD inquiries can go to SCSI-2 type devices, | |
1847 | * some USB ones crash on receiving them, and the pages | |
1848 | * we currently ask for are for SPC-3 and beyond | |
1849 | */ | |
1850 | if (sdp->scsi_level > SCSI_SPC_2) | |
1851 | return 1; | |
1852 | return 0; | |
1853 | } | |
1854 | ||
1da177e4 LT |
1855 | /** |
1856 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1857 | * performs disk spin up, read_capacity, etc. | |
1858 | * @disk: struct gendisk we care about | |
1859 | **/ | |
1860 | static int sd_revalidate_disk(struct gendisk *disk) | |
1861 | { | |
1862 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1863 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 1864 | unsigned char *buffer; |
461d4e90 | 1865 | unsigned ordered; |
1da177e4 | 1866 | |
fa0d34be MP |
1867 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
1868 | "sd_revalidate_disk\n")); | |
1da177e4 LT |
1869 | |
1870 | /* | |
1871 | * If the device is offline, don't try and read capacity or any | |
1872 | * of the other niceties. | |
1873 | */ | |
1874 | if (!scsi_device_online(sdp)) | |
1875 | goto out; | |
1876 | ||
a6123f14 | 1877 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); |
1da177e4 | 1878 | if (!buffer) { |
e73aec82 MP |
1879 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
1880 | "allocation failure.\n"); | |
ea73a9f2 | 1881 | goto out; |
1da177e4 LT |
1882 | } |
1883 | ||
e73aec82 | 1884 | sd_spinup_disk(sdkp); |
1da177e4 LT |
1885 | |
1886 | /* | |
1887 | * Without media there is no reason to ask; moreover, some devices | |
1888 | * react badly if we do. | |
1889 | */ | |
1890 | if (sdkp->media_present) { | |
e73aec82 | 1891 | sd_read_capacity(sdkp, buffer); |
ffd4bc2a MP |
1892 | |
1893 | if (sd_try_extended_inquiry(sdp)) { | |
1894 | sd_read_block_limits(sdkp); | |
1895 | sd_read_block_characteristics(sdkp); | |
1896 | } | |
1897 | ||
e73aec82 MP |
1898 | sd_read_write_protect_flag(sdkp, buffer); |
1899 | sd_read_cache_type(sdkp, buffer); | |
e0597d70 | 1900 | sd_read_app_tag_own(sdkp, buffer); |
1da177e4 | 1901 | } |
461d4e90 | 1902 | |
70a9b873 MP |
1903 | sdkp->first_scan = 0; |
1904 | ||
461d4e90 TH |
1905 | /* |
1906 | * We now have all cache related info, determine how we deal | |
1907 | * with ordered requests. Note that as the current SCSI | |
1908 | * dispatch function can alter request order, we cannot use | |
1909 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
1910 | */ | |
1911 | if (sdkp->WCE) | |
007365ad TH |
1912 | ordered = sdkp->DPOFUA |
1913 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
1914 | else |
1915 | ordered = QUEUE_ORDERED_DRAIN; | |
1916 | ||
1917 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
1918 | ||
1da177e4 LT |
1919 | set_capacity(disk, sdkp->capacity); |
1920 | kfree(buffer); | |
1921 | ||
1da177e4 LT |
1922 | out: |
1923 | return 0; | |
1924 | } | |
1925 | ||
3e1a7ff8 TH |
1926 | /** |
1927 | * sd_format_disk_name - format disk name | |
1928 | * @prefix: name prefix - ie. "sd" for SCSI disks | |
1929 | * @index: index of the disk to format name for | |
1930 | * @buf: output buffer | |
1931 | * @buflen: length of the output buffer | |
1932 | * | |
1933 | * SCSI disk names starts at sda. The 26th device is sdz and the | |
1934 | * 27th is sdaa. The last one for two lettered suffix is sdzz | |
1935 | * which is followed by sdaaa. | |
1936 | * | |
1937 | * This is basically 26 base counting with one extra 'nil' entry | |
1938 | * at the beggining from the second digit on and can be | |
1939 | * determined using similar method as 26 base conversion with the | |
1940 | * index shifted -1 after each digit is computed. | |
1941 | * | |
1942 | * CONTEXT: | |
1943 | * Don't care. | |
1944 | * | |
1945 | * RETURNS: | |
1946 | * 0 on success, -errno on failure. | |
1947 | */ | |
1948 | static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) | |
1949 | { | |
1950 | const int base = 'z' - 'a' + 1; | |
1951 | char *begin = buf + strlen(prefix); | |
1952 | char *end = buf + buflen; | |
1953 | char *p; | |
1954 | int unit; | |
1955 | ||
1956 | p = end - 1; | |
1957 | *p = '\0'; | |
1958 | unit = base; | |
1959 | do { | |
1960 | if (p == begin) | |
1961 | return -EINVAL; | |
1962 | *--p = 'a' + (index % unit); | |
1963 | index = (index / unit) - 1; | |
1964 | } while (index >= 0); | |
1965 | ||
1966 | memmove(begin, p, end - p); | |
1967 | memcpy(buf, prefix, strlen(prefix)); | |
1968 | ||
1969 | return 0; | |
1970 | } | |
1971 | ||
4ace92fc AV |
1972 | /* |
1973 | * The asynchronous part of sd_probe | |
1974 | */ | |
1975 | static void sd_probe_async(void *data, async_cookie_t cookie) | |
1976 | { | |
1977 | struct scsi_disk *sdkp = data; | |
1978 | struct scsi_device *sdp; | |
1979 | struct gendisk *gd; | |
1980 | u32 index; | |
1981 | struct device *dev; | |
1982 | ||
1983 | sdp = sdkp->device; | |
1984 | gd = sdkp->disk; | |
1985 | index = sdkp->index; | |
1986 | dev = &sdp->sdev_gendev; | |
1987 | ||
4ace92fc AV |
1988 | if (index < SD_MAX_DISKS) { |
1989 | gd->major = sd_major((index & 0xf0) >> 4); | |
1990 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
1991 | gd->minors = SD_MINORS; | |
1992 | } | |
1993 | gd->fops = &sd_fops; | |
1994 | gd->private_data = &sdkp->driver; | |
1995 | gd->queue = sdkp->device->request_queue; | |
1996 | ||
70a9b873 MP |
1997 | /* defaults, until the device tells us otherwise */ |
1998 | sdp->sector_size = 512; | |
1999 | sdkp->capacity = 0; | |
2000 | sdkp->media_present = 1; | |
2001 | sdkp->write_prot = 0; | |
2002 | sdkp->WCE = 0; | |
2003 | sdkp->RCD = 0; | |
2004 | sdkp->ATO = 0; | |
2005 | sdkp->first_scan = 1; | |
2006 | ||
4ace92fc AV |
2007 | sd_revalidate_disk(gd); |
2008 | ||
2009 | blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); | |
2010 | ||
2011 | gd->driverfs_dev = &sdp->sdev_gendev; | |
2012 | gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS; | |
2013 | if (sdp->removable) | |
2014 | gd->flags |= GENHD_FL_REMOVABLE; | |
2015 | ||
2016 | dev_set_drvdata(dev, sdkp); | |
2017 | add_disk(gd); | |
2018 | sd_dif_config_host(sdkp); | |
2019 | ||
3821d768 MP |
2020 | sd_revalidate_disk(gd); |
2021 | ||
4ace92fc AV |
2022 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
2023 | sdp->removable ? "removable " : ""); | |
ea038f63 | 2024 | put_device(&sdkp->dev); |
4ace92fc AV |
2025 | } |
2026 | ||
1da177e4 LT |
2027 | /** |
2028 | * sd_probe - called during driver initialization and whenever a | |
2029 | * new scsi device is attached to the system. It is called once | |
2030 | * for each scsi device (not just disks) present. | |
2031 | * @dev: pointer to device object | |
2032 | * | |
2033 | * Returns 0 if successful (or not interested in this scsi device | |
2034 | * (e.g. scanner)); 1 when there is an error. | |
2035 | * | |
2036 | * Note: this function is invoked from the scsi mid-level. | |
2037 | * This function sets up the mapping between a given | |
2038 | * <host,channel,id,lun> (found in sdp) and new device name | |
2039 | * (e.g. /dev/sda). More precisely it is the block device major | |
2040 | * and minor number that is chosen here. | |
2041 | * | |
2042 | * Assume sd_attach is not re-entrant (for time being) | |
2043 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
2044 | **/ | |
2045 | static int sd_probe(struct device *dev) | |
2046 | { | |
2047 | struct scsi_device *sdp = to_scsi_device(dev); | |
2048 | struct scsi_disk *sdkp; | |
2049 | struct gendisk *gd; | |
2050 | u32 index; | |
2051 | int error; | |
2052 | ||
2053 | error = -ENODEV; | |
631e8a13 | 2054 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
2055 | goto out; |
2056 | ||
9ccfc756 JB |
2057 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
2058 | "sd_attach\n")); | |
1da177e4 LT |
2059 | |
2060 | error = -ENOMEM; | |
24669f75 | 2061 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
2062 | if (!sdkp) |
2063 | goto out; | |
2064 | ||
689d6fac | 2065 | gd = alloc_disk(SD_MINORS); |
1da177e4 LT |
2066 | if (!gd) |
2067 | goto out_free; | |
2068 | ||
f27bac27 TH |
2069 | do { |
2070 | if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) | |
2071 | goto out_put; | |
1da177e4 | 2072 | |
4034cc68 | 2073 | spin_lock(&sd_index_lock); |
f27bac27 | 2074 | error = ida_get_new(&sd_index_ida, &index); |
4034cc68 | 2075 | spin_unlock(&sd_index_lock); |
f27bac27 | 2076 | } while (error == -EAGAIN); |
1da177e4 | 2077 | |
1da177e4 LT |
2078 | if (error) |
2079 | goto out_put; | |
2080 | ||
3e1a7ff8 TH |
2081 | error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); |
2082 | if (error) | |
f27bac27 TH |
2083 | goto out_free_index; |
2084 | ||
1da177e4 LT |
2085 | sdkp->device = sdp; |
2086 | sdkp->driver = &sd_template; | |
2087 | sdkp->disk = gd; | |
2088 | sdkp->index = index; | |
2089 | sdkp->openers = 0; | |
c02e6002 | 2090 | sdkp->previous_state = 1; |
1da177e4 | 2091 | |
601e7638 JB |
2092 | if (!sdp->request_queue->rq_timeout) { |
2093 | if (sdp->type != TYPE_MOD) | |
2094 | blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); | |
2095 | else | |
2096 | blk_queue_rq_timeout(sdp->request_queue, | |
2097 | SD_MOD_TIMEOUT); | |
2098 | } | |
2099 | ||
2100 | device_initialize(&sdkp->dev); | |
2101 | sdkp->dev.parent = &sdp->sdev_gendev; | |
2102 | sdkp->dev.class = &sd_disk_class; | |
2103 | dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); | |
2104 | ||
2105 | if (device_add(&sdkp->dev)) | |
2106 | goto out_free_index; | |
2107 | ||
2108 | get_device(&sdp->sdev_gendev); | |
2109 | ||
ea038f63 | 2110 | get_device(&sdkp->dev); /* prevent release before async_schedule */ |
4ace92fc | 2111 | async_schedule(sd_probe_async, sdkp); |
1da177e4 LT |
2112 | |
2113 | return 0; | |
2114 | ||
f27bac27 | 2115 | out_free_index: |
4034cc68 | 2116 | spin_lock(&sd_index_lock); |
f27bac27 | 2117 | ida_remove(&sd_index_ida, index); |
4034cc68 | 2118 | spin_unlock(&sd_index_lock); |
6bdaa1f1 | 2119 | out_put: |
1da177e4 | 2120 | put_disk(gd); |
6bdaa1f1 | 2121 | out_free: |
1da177e4 | 2122 | kfree(sdkp); |
6bdaa1f1 | 2123 | out: |
1da177e4 LT |
2124 | return error; |
2125 | } | |
2126 | ||
2127 | /** | |
2128 | * sd_remove - called whenever a scsi disk (previously recognized by | |
2129 | * sd_probe) is detached from the system. It is called (potentially | |
2130 | * multiple times) during sd module unload. | |
2131 | * @sdp: pointer to mid level scsi device object | |
2132 | * | |
2133 | * Note: this function is invoked from the scsi mid-level. | |
2134 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
2135 | * that could be re-used by a subsequent sd_probe(). | |
2136 | * This function is not called when the built-in sd driver is "exit-ed". | |
2137 | **/ | |
2138 | static int sd_remove(struct device *dev) | |
2139 | { | |
601e7638 | 2140 | struct scsi_disk *sdkp; |
1da177e4 | 2141 | |
601e7638 JB |
2142 | async_synchronize_full(); |
2143 | sdkp = dev_get_drvdata(dev); | |
b391277a | 2144 | blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); |
ee959b00 | 2145 | device_del(&sdkp->dev); |
1da177e4 LT |
2146 | del_gendisk(sdkp->disk); |
2147 | sd_shutdown(dev); | |
39b7f1e2 | 2148 | |
0b950672 | 2149 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 2150 | dev_set_drvdata(dev, NULL); |
ee959b00 | 2151 | put_device(&sdkp->dev); |
0b950672 | 2152 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
2153 | |
2154 | return 0; | |
2155 | } | |
2156 | ||
2157 | /** | |
2158 | * scsi_disk_release - Called to free the scsi_disk structure | |
ee959b00 | 2159 | * @dev: pointer to embedded class device |
1da177e4 | 2160 | * |
0b950672 | 2161 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
2162 | * called on last put, you should always use the scsi_disk_get() |
2163 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
ee959b00 | 2164 | * and never do a direct put_device. |
1da177e4 | 2165 | **/ |
ee959b00 | 2166 | static void scsi_disk_release(struct device *dev) |
1da177e4 | 2167 | { |
ee959b00 | 2168 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
1da177e4 LT |
2169 | struct gendisk *disk = sdkp->disk; |
2170 | ||
4034cc68 | 2171 | spin_lock(&sd_index_lock); |
f27bac27 | 2172 | ida_remove(&sd_index_ida, sdkp->index); |
4034cc68 | 2173 | spin_unlock(&sd_index_lock); |
1da177e4 LT |
2174 | |
2175 | disk->private_data = NULL; | |
1da177e4 | 2176 | put_disk(disk); |
39b7f1e2 | 2177 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
2178 | |
2179 | kfree(sdkp); | |
2180 | } | |
2181 | ||
cc5d2c8c | 2182 | static int sd_start_stop_device(struct scsi_disk *sdkp, int start) |
c3c94c5a TH |
2183 | { |
2184 | unsigned char cmd[6] = { START_STOP }; /* START_VALID */ | |
2185 | struct scsi_sense_hdr sshdr; | |
cc5d2c8c | 2186 | struct scsi_device *sdp = sdkp->device; |
c3c94c5a TH |
2187 | int res; |
2188 | ||
2189 | if (start) | |
2190 | cmd[4] |= 1; /* START */ | |
2191 | ||
d2886ea3 SR |
2192 | if (sdp->start_stop_pwr_cond) |
2193 | cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ | |
2194 | ||
c3c94c5a TH |
2195 | if (!scsi_device_online(sdp)) |
2196 | return -ENODEV; | |
2197 | ||
2198 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, | |
f4f4e47e | 2199 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
c3c94c5a | 2200 | if (res) { |
cc5d2c8c JB |
2201 | sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
2202 | sd_print_result(sdkp, res); | |
c3c94c5a | 2203 | if (driver_byte(res) & DRIVER_SENSE) |
cc5d2c8c | 2204 | sd_print_sense_hdr(sdkp, &sshdr); |
c3c94c5a TH |
2205 | } |
2206 | ||
2207 | return res; | |
2208 | } | |
2209 | ||
1da177e4 LT |
2210 | /* |
2211 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
2212 | * the normal SCSI command structure. Wait for the command to | |
2213 | * complete. | |
2214 | */ | |
2215 | static void sd_shutdown(struct device *dev) | |
2216 | { | |
39b7f1e2 | 2217 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
2218 | |
2219 | if (!sdkp) | |
2220 | return; /* this can happen */ | |
2221 | ||
39b7f1e2 | 2222 | if (sdkp->WCE) { |
e73aec82 MP |
2223 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
2224 | sd_sync_cache(sdkp); | |
39b7f1e2 | 2225 | } |
c3c94c5a | 2226 | |
cc5d2c8c JB |
2227 | if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { |
2228 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); | |
2229 | sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2230 | } |
2231 | ||
39b7f1e2 AS |
2232 | scsi_disk_put(sdkp); |
2233 | } | |
1da177e4 | 2234 | |
c3c94c5a TH |
2235 | static int sd_suspend(struct device *dev, pm_message_t mesg) |
2236 | { | |
c3c94c5a | 2237 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2238 | int ret = 0; |
c3c94c5a TH |
2239 | |
2240 | if (!sdkp) | |
2241 | return 0; /* this can happen */ | |
2242 | ||
2243 | if (sdkp->WCE) { | |
cc5d2c8c | 2244 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
c3c94c5a TH |
2245 | ret = sd_sync_cache(sdkp); |
2246 | if (ret) | |
09ff92fe | 2247 | goto done; |
c3c94c5a TH |
2248 | } |
2249 | ||
3a2d5b70 | 2250 | if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { |
cc5d2c8c JB |
2251 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
2252 | ret = sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2253 | } |
2254 | ||
09ff92fe AS |
2255 | done: |
2256 | scsi_disk_put(sdkp); | |
2257 | return ret; | |
c3c94c5a TH |
2258 | } |
2259 | ||
2260 | static int sd_resume(struct device *dev) | |
2261 | { | |
c3c94c5a | 2262 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2263 | int ret = 0; |
c3c94c5a | 2264 | |
cc5d2c8c | 2265 | if (!sdkp->device->manage_start_stop) |
09ff92fe | 2266 | goto done; |
c3c94c5a | 2267 | |
cc5d2c8c | 2268 | sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
09ff92fe | 2269 | ret = sd_start_stop_device(sdkp, 1); |
c3c94c5a | 2270 | |
09ff92fe AS |
2271 | done: |
2272 | scsi_disk_put(sdkp); | |
2273 | return ret; | |
c3c94c5a TH |
2274 | } |
2275 | ||
1da177e4 LT |
2276 | /** |
2277 | * init_sd - entry point for this driver (both when built in or when | |
2278 | * a module). | |
2279 | * | |
2280 | * Note: this function registers this driver with the scsi mid-level. | |
2281 | **/ | |
2282 | static int __init init_sd(void) | |
2283 | { | |
5e4009ba | 2284 | int majors = 0, i, err; |
1da177e4 LT |
2285 | |
2286 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
2287 | ||
2288 | for (i = 0; i < SD_MAJORS; i++) | |
2289 | if (register_blkdev(sd_major(i), "sd") == 0) | |
2290 | majors++; | |
2291 | ||
2292 | if (!majors) | |
2293 | return -ENODEV; | |
2294 | ||
5e4009ba JG |
2295 | err = class_register(&sd_disk_class); |
2296 | if (err) | |
2297 | goto err_out; | |
6bdaa1f1 | 2298 | |
5e4009ba JG |
2299 | err = scsi_register_driver(&sd_template.gendrv); |
2300 | if (err) | |
2301 | goto err_out_class; | |
2302 | ||
2303 | return 0; | |
2304 | ||
2305 | err_out_class: | |
2306 | class_unregister(&sd_disk_class); | |
2307 | err_out: | |
2308 | for (i = 0; i < SD_MAJORS; i++) | |
2309 | unregister_blkdev(sd_major(i), "sd"); | |
2310 | return err; | |
1da177e4 LT |
2311 | } |
2312 | ||
2313 | /** | |
2314 | * exit_sd - exit point for this driver (when it is a module). | |
2315 | * | |
2316 | * Note: this function unregisters this driver from the scsi mid-level. | |
2317 | **/ | |
2318 | static void __exit exit_sd(void) | |
2319 | { | |
2320 | int i; | |
2321 | ||
2322 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
2323 | ||
2324 | scsi_unregister_driver(&sd_template.gendrv); | |
5e4009ba JG |
2325 | class_unregister(&sd_disk_class); |
2326 | ||
1da177e4 LT |
2327 | for (i = 0; i < SD_MAJORS; i++) |
2328 | unregister_blkdev(sd_major(i), "sd"); | |
2329 | } | |
2330 | ||
1da177e4 LT |
2331 | module_init(init_sd); |
2332 | module_exit(exit_sd); | |
e73aec82 MP |
2333 | |
2334 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, | |
2335 | struct scsi_sense_hdr *sshdr) | |
2336 | { | |
2337 | sd_printk(KERN_INFO, sdkp, ""); | |
2338 | scsi_show_sense_hdr(sshdr); | |
2339 | sd_printk(KERN_INFO, sdkp, ""); | |
2340 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); | |
2341 | } | |
2342 | ||
2343 | static void sd_print_result(struct scsi_disk *sdkp, int result) | |
2344 | { | |
2345 | sd_printk(KERN_INFO, sdkp, ""); | |
2346 | scsi_show_result(result); | |
2347 | } | |
2348 |