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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> |
1da177e4 LT |
50 | #include <asm/uaccess.h> |
51 | ||
52 | #include <scsi/scsi.h> | |
53 | #include <scsi/scsi_cmnd.h> | |
54 | #include <scsi/scsi_dbg.h> | |
55 | #include <scsi/scsi_device.h> | |
56 | #include <scsi/scsi_driver.h> | |
57 | #include <scsi/scsi_eh.h> | |
58 | #include <scsi/scsi_host.h> | |
59 | #include <scsi/scsi_ioctl.h> | |
1da177e4 | 60 | #include <scsi/scsicam.h> |
e73aec82 | 61 | #include <scsi/sd.h> |
1da177e4 LT |
62 | |
63 | #include "scsi_logging.h" | |
64 | ||
f018fa55 RH |
65 | MODULE_AUTHOR("Eric Youngdale"); |
66 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
67 | MODULE_LICENSE("GPL"); | |
68 | ||
69 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
70 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
71 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
72 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
73 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
74 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
75 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
d7b8bcb0 MT |
85 | MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); |
86 | MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); | |
87 | MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); | |
f018fa55 | 88 | |
1da177e4 LT |
89 | static DEFINE_IDR(sd_index_idr); |
90 | static DEFINE_SPINLOCK(sd_index_lock); | |
91 | ||
92 | /* This semaphore is used to mediate the 0->1 reference get in the | |
93 | * face of object destruction (i.e. we can't allow a get on an | |
94 | * object after last put) */ | |
0b950672 | 95 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 | 96 | |
6bdaa1f1 JB |
97 | static const char *sd_cache_types[] = { |
98 | "write through", "none", "write back", | |
99 | "write back, no read (daft)" | |
100 | }; | |
101 | ||
102 | static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf, | |
103 | size_t count) | |
104 | { | |
105 | int i, ct = -1, rcd, wce, sp; | |
106 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
107 | struct scsi_device *sdp = sdkp->device; | |
108 | char buffer[64]; | |
109 | char *buffer_data; | |
110 | struct scsi_mode_data data; | |
111 | struct scsi_sense_hdr sshdr; | |
112 | int len; | |
113 | ||
114 | if (sdp->type != TYPE_DISK) | |
115 | /* no cache control on RBC devices; theoretically they | |
116 | * can do it, but there's probably so many exceptions | |
117 | * it's not worth the risk */ | |
118 | return -EINVAL; | |
119 | ||
6391a113 | 120 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
121 | const int len = strlen(sd_cache_types[i]); |
122 | if (strncmp(sd_cache_types[i], buf, len) == 0 && | |
123 | buf[len] == '\n') { | |
124 | ct = i; | |
125 | break; | |
126 | } | |
127 | } | |
128 | if (ct < 0) | |
129 | return -EINVAL; | |
130 | rcd = ct & 0x01 ? 1 : 0; | |
131 | wce = ct & 0x02 ? 1 : 0; | |
132 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
133 | SD_MAX_RETRIES, &data, NULL)) | |
134 | return -EINVAL; | |
a9312fb8 | 135 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
136 | data.block_descriptor_length); |
137 | buffer_data = buffer + data.header_length + | |
138 | data.block_descriptor_length; | |
139 | buffer_data[2] &= ~0x05; | |
140 | buffer_data[2] |= wce << 2 | rcd; | |
141 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
142 | ||
143 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
144 | SD_MAX_RETRIES, &data, &sshdr)) { | |
145 | if (scsi_sense_valid(&sshdr)) | |
e73aec82 | 146 | sd_print_sense_hdr(sdkp, &sshdr); |
6bdaa1f1 JB |
147 | return -EINVAL; |
148 | } | |
149 | sd_revalidate_disk(sdkp->disk); | |
150 | return count; | |
151 | } | |
152 | ||
c3c94c5a TH |
153 | static ssize_t sd_store_manage_start_stop(struct class_device *cdev, |
154 | const char *buf, size_t count) | |
155 | { | |
156 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
157 | struct scsi_device *sdp = sdkp->device; | |
158 | ||
159 | if (!capable(CAP_SYS_ADMIN)) | |
160 | return -EACCES; | |
161 | ||
162 | sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); | |
163 | ||
164 | return count; | |
165 | } | |
166 | ||
a144c5ae BK |
167 | static ssize_t sd_store_allow_restart(struct class_device *cdev, const char *buf, |
168 | size_t count) | |
169 | { | |
170 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
171 | struct scsi_device *sdp = sdkp->device; | |
172 | ||
173 | if (!capable(CAP_SYS_ADMIN)) | |
174 | return -EACCES; | |
175 | ||
176 | if (sdp->type != TYPE_DISK) | |
177 | return -EINVAL; | |
178 | ||
179 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); | |
180 | ||
181 | return count; | |
182 | } | |
183 | ||
6bdaa1f1 JB |
184 | static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf) |
185 | { | |
186 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
187 | int ct = sdkp->RCD + 2*sdkp->WCE; | |
188 | ||
189 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
190 | } | |
191 | ||
192 | static ssize_t sd_show_fua(struct class_device *cdev, char *buf) | |
193 | { | |
194 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
195 | ||
196 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
197 | } | |
198 | ||
c3c94c5a TH |
199 | static ssize_t sd_show_manage_start_stop(struct class_device *cdev, char *buf) |
200 | { | |
201 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
202 | struct scsi_device *sdp = sdkp->device; | |
203 | ||
204 | return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); | |
205 | } | |
206 | ||
a144c5ae BK |
207 | static ssize_t sd_show_allow_restart(struct class_device *cdev, char *buf) |
208 | { | |
209 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
210 | ||
211 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
212 | } | |
213 | ||
6bdaa1f1 JB |
214 | static struct class_device_attribute sd_disk_attrs[] = { |
215 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, | |
216 | sd_store_cache_type), | |
217 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
a144c5ae BK |
218 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
219 | sd_store_allow_restart), | |
c3c94c5a TH |
220 | __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
221 | sd_store_manage_start_stop), | |
6bdaa1f1 JB |
222 | __ATTR_NULL, |
223 | }; | |
224 | ||
225 | static struct class sd_disk_class = { | |
226 | .name = "scsi_disk", | |
227 | .owner = THIS_MODULE, | |
228 | .release = scsi_disk_release, | |
229 | .class_dev_attrs = sd_disk_attrs, | |
230 | }; | |
1da177e4 LT |
231 | |
232 | static struct scsi_driver sd_template = { | |
233 | .owner = THIS_MODULE, | |
234 | .gendrv = { | |
235 | .name = "sd", | |
236 | .probe = sd_probe, | |
237 | .remove = sd_remove, | |
c3c94c5a TH |
238 | .suspend = sd_suspend, |
239 | .resume = sd_resume, | |
1da177e4 LT |
240 | .shutdown = sd_shutdown, |
241 | }, | |
242 | .rescan = sd_rescan, | |
243 | .init_command = sd_init_command, | |
244 | .issue_flush = sd_issue_flush, | |
1da177e4 LT |
245 | }; |
246 | ||
247 | /* | |
248 | * Device no to disk mapping: | |
249 | * | |
250 | * major disc2 disc p1 | |
251 | * |............|.............|....|....| <- dev_t | |
252 | * 31 20 19 8 7 4 3 0 | |
253 | * | |
254 | * Inside a major, we have 16k disks, however mapped non- | |
255 | * contiguously. The first 16 disks are for major0, the next | |
256 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
257 | * for major1, ... | |
258 | * As we stay compatible with our numbering scheme, we can reuse | |
259 | * the well-know SCSI majors 8, 65--71, 136--143. | |
260 | */ | |
261 | static int sd_major(int major_idx) | |
262 | { | |
263 | switch (major_idx) { | |
264 | case 0: | |
265 | return SCSI_DISK0_MAJOR; | |
266 | case 1 ... 7: | |
267 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
268 | case 8 ... 15: | |
269 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
270 | default: | |
271 | BUG(); | |
272 | return 0; /* shut up gcc */ | |
273 | } | |
274 | } | |
275 | ||
1da177e4 LT |
276 | static inline struct scsi_disk *scsi_disk(struct gendisk *disk) |
277 | { | |
278 | return container_of(disk->private_data, struct scsi_disk, driver); | |
279 | } | |
280 | ||
39b7f1e2 | 281 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
282 | { |
283 | struct scsi_disk *sdkp = NULL; | |
284 | ||
39b7f1e2 AS |
285 | if (disk->private_data) { |
286 | sdkp = scsi_disk(disk); | |
287 | if (scsi_device_get(sdkp->device) == 0) | |
6bdaa1f1 | 288 | class_device_get(&sdkp->cdev); |
39b7f1e2 AS |
289 | else |
290 | sdkp = NULL; | |
291 | } | |
292 | return sdkp; | |
293 | } | |
294 | ||
295 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
296 | { | |
297 | struct scsi_disk *sdkp; | |
298 | ||
0b950672 | 299 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 300 | sdkp = __scsi_disk_get(disk); |
0b950672 | 301 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 302 | return sdkp; |
39b7f1e2 | 303 | } |
1da177e4 | 304 | |
39b7f1e2 AS |
305 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
306 | { | |
307 | struct scsi_disk *sdkp; | |
308 | ||
0b950672 | 309 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
310 | sdkp = dev_get_drvdata(dev); |
311 | if (sdkp) | |
312 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 313 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
314 | return sdkp; |
315 | } | |
316 | ||
317 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
318 | { | |
319 | struct scsi_device *sdev = sdkp->device; | |
320 | ||
0b950672 | 321 | mutex_lock(&sd_ref_mutex); |
6bdaa1f1 | 322 | class_device_put(&sdkp->cdev); |
1da177e4 | 323 | scsi_device_put(sdev); |
0b950672 | 324 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
325 | } |
326 | ||
327 | /** | |
328 | * sd_init_command - build a scsi (read or write) command from | |
329 | * information in the request structure. | |
330 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
331 | * contains request and into which the scsi command is written | |
332 | * | |
333 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
334 | **/ | |
335 | static int sd_init_command(struct scsi_cmnd * SCpnt) | |
336 | { | |
1da177e4 LT |
337 | struct scsi_device *sdp = SCpnt->device; |
338 | struct request *rq = SCpnt->request; | |
776b23a0 CH |
339 | struct gendisk *disk = rq->rq_disk; |
340 | sector_t block = rq->sector; | |
341 | unsigned int this_count = SCpnt->request_bufflen >> 9; | |
342 | unsigned int timeout = sdp->timeout; | |
1da177e4 | 343 | |
fa0d34be MP |
344 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
345 | "sd_init_command: block=%llu, " | |
346 | "count=%d\n", | |
347 | (unsigned long long)block, | |
348 | this_count)); | |
1da177e4 LT |
349 | |
350 | if (!sdp || !scsi_device_online(sdp) || | |
351 | block + rq->nr_sectors > get_capacity(disk)) { | |
fa0d34be MP |
352 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
353 | "Finishing %ld sectors\n", | |
354 | rq->nr_sectors)); | |
355 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, | |
356 | "Retry with 0x%p\n", SCpnt)); | |
1da177e4 LT |
357 | return 0; |
358 | } | |
359 | ||
360 | if (sdp->changed) { | |
361 | /* | |
362 | * quietly refuse to do anything to a changed disc until | |
363 | * the changed bit has been reset | |
364 | */ | |
365 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
366 | return 0; | |
367 | } | |
fa0d34be MP |
368 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
369 | (unsigned long long)block)); | |
1da177e4 LT |
370 | |
371 | /* | |
372 | * If we have a 1K hardware sectorsize, prevent access to single | |
373 | * 512 byte sectors. In theory we could handle this - in fact | |
374 | * the scsi cdrom driver must be able to handle this because | |
375 | * we typically use 1K blocksizes, and cdroms typically have | |
376 | * 2K hardware sectorsizes. Of course, things are simpler | |
377 | * with the cdrom, since it is read-only. For performance | |
378 | * reasons, the filesystems should be able to handle this | |
379 | * and not force the scsi disk driver to use bounce buffers | |
380 | * for this. | |
381 | */ | |
382 | if (sdp->sector_size == 1024) { | |
383 | if ((block & 1) || (rq->nr_sectors & 1)) { | |
e73aec82 MP |
384 | scmd_printk(KERN_ERR, SCpnt, |
385 | "Bad block number requested\n"); | |
1da177e4 LT |
386 | return 0; |
387 | } else { | |
388 | block = block >> 1; | |
389 | this_count = this_count >> 1; | |
390 | } | |
391 | } | |
392 | if (sdp->sector_size == 2048) { | |
393 | if ((block & 3) || (rq->nr_sectors & 3)) { | |
e73aec82 MP |
394 | scmd_printk(KERN_ERR, SCpnt, |
395 | "Bad block number requested\n"); | |
1da177e4 LT |
396 | return 0; |
397 | } else { | |
398 | block = block >> 2; | |
399 | this_count = this_count >> 2; | |
400 | } | |
401 | } | |
402 | if (sdp->sector_size == 4096) { | |
403 | if ((block & 7) || (rq->nr_sectors & 7)) { | |
e73aec82 MP |
404 | scmd_printk(KERN_ERR, SCpnt, |
405 | "Bad block number requested\n"); | |
1da177e4 LT |
406 | return 0; |
407 | } else { | |
408 | block = block >> 3; | |
409 | this_count = this_count >> 3; | |
410 | } | |
411 | } | |
412 | if (rq_data_dir(rq) == WRITE) { | |
413 | if (!sdp->writeable) { | |
414 | return 0; | |
415 | } | |
416 | SCpnt->cmnd[0] = WRITE_6; | |
417 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
418 | } else if (rq_data_dir(rq) == READ) { | |
419 | SCpnt->cmnd[0] = READ_6; | |
420 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
421 | } else { | |
e73aec82 | 422 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
1da177e4 LT |
423 | return 0; |
424 | } | |
425 | ||
fa0d34be MP |
426 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
427 | "%s %d/%ld 512 byte blocks.\n", | |
428 | (rq_data_dir(rq) == WRITE) ? | |
429 | "writing" : "reading", this_count, | |
430 | rq->nr_sectors)); | |
1da177e4 LT |
431 | |
432 | SCpnt->cmnd[1] = 0; | |
433 | ||
434 | if (block > 0xffffffff) { | |
435 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
007365ad | 436 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
437 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
438 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
439 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
440 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
441 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
442 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
443 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
444 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
445 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
446 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
447 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
448 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
449 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
450 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
451 | SCpnt->device->use_10_for_rw) { | |
452 | if (this_count > 0xffff) | |
453 | this_count = 0xffff; | |
454 | ||
455 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
007365ad | 456 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
457 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
458 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
459 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
460 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
461 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
462 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
463 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
464 | } else { | |
007365ad TH |
465 | if (unlikely(blk_fua_rq(rq))) { |
466 | /* | |
467 | * This happens only if this drive failed | |
468 | * 10byte rw command with ILLEGAL_REQUEST | |
469 | * during operation and thus turned off | |
470 | * use_10_for_rw. | |
471 | */ | |
e73aec82 MP |
472 | scmd_printk(KERN_ERR, SCpnt, |
473 | "FUA write on READ/WRITE(6) drive\n"); | |
007365ad TH |
474 | return 0; |
475 | } | |
476 | ||
1da177e4 LT |
477 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
478 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
479 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
480 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
481 | SCpnt->cmnd[5] = 0; | |
482 | } | |
631c228c | 483 | SCpnt->request_bufflen = this_count * sdp->sector_size; |
1da177e4 LT |
484 | |
485 | /* | |
486 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
487 | * host adapter, it's safe to assume that we can at least transfer | |
488 | * this many bytes between each connect / disconnect. | |
489 | */ | |
490 | SCpnt->transfersize = sdp->sector_size; | |
491 | SCpnt->underflow = this_count << 9; | |
492 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 LT |
493 | SCpnt->timeout_per_command = timeout; |
494 | ||
495 | /* | |
496 | * This is the completion routine we use. This is matched in terms | |
497 | * of capability to this function. | |
498 | */ | |
499 | SCpnt->done = sd_rw_intr; | |
500 | ||
501 | /* | |
502 | * This indicates that the command is ready from our end to be | |
503 | * queued. | |
504 | */ | |
505 | return 1; | |
506 | } | |
507 | ||
508 | /** | |
509 | * sd_open - open a scsi disk device | |
510 | * @inode: only i_rdev member may be used | |
511 | * @filp: only f_mode and f_flags may be used | |
512 | * | |
513 | * Returns 0 if successful. Returns a negated errno value in case | |
514 | * of error. | |
515 | * | |
516 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
517 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
518 | * In the latter case @inode and @filp carry an abridged amount | |
519 | * of information as noted above. | |
520 | **/ | |
521 | static int sd_open(struct inode *inode, struct file *filp) | |
522 | { | |
523 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
524 | struct scsi_disk *sdkp; | |
525 | struct scsi_device *sdev; | |
526 | int retval; | |
527 | ||
528 | if (!(sdkp = scsi_disk_get(disk))) | |
529 | return -ENXIO; | |
530 | ||
531 | ||
fa0d34be | 532 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1da177e4 LT |
533 | |
534 | sdev = sdkp->device; | |
535 | ||
536 | /* | |
537 | * If the device is in error recovery, wait until it is done. | |
538 | * If the device is offline, then disallow any access to it. | |
539 | */ | |
540 | retval = -ENXIO; | |
541 | if (!scsi_block_when_processing_errors(sdev)) | |
542 | goto error_out; | |
543 | ||
544 | if (sdev->removable || sdkp->write_prot) | |
545 | check_disk_change(inode->i_bdev); | |
546 | ||
547 | /* | |
548 | * If the drive is empty, just let the open fail. | |
549 | */ | |
550 | retval = -ENOMEDIUM; | |
551 | if (sdev->removable && !sdkp->media_present && | |
552 | !(filp->f_flags & O_NDELAY)) | |
553 | goto error_out; | |
554 | ||
555 | /* | |
556 | * If the device has the write protect tab set, have the open fail | |
557 | * if the user expects to be able to write to the thing. | |
558 | */ | |
559 | retval = -EROFS; | |
560 | if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) | |
561 | goto error_out; | |
562 | ||
563 | /* | |
564 | * It is possible that the disk changing stuff resulted in | |
565 | * the device being taken offline. If this is the case, | |
566 | * report this to the user, and don't pretend that the | |
567 | * open actually succeeded. | |
568 | */ | |
569 | retval = -ENXIO; | |
570 | if (!scsi_device_online(sdev)) | |
571 | goto error_out; | |
572 | ||
573 | if (!sdkp->openers++ && sdev->removable) { | |
574 | if (scsi_block_when_processing_errors(sdev)) | |
575 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
576 | } | |
577 | ||
578 | return 0; | |
579 | ||
580 | error_out: | |
581 | scsi_disk_put(sdkp); | |
582 | return retval; | |
583 | } | |
584 | ||
585 | /** | |
586 | * sd_release - invoked when the (last) close(2) is called on this | |
587 | * scsi disk. | |
588 | * @inode: only i_rdev member may be used | |
589 | * @filp: only f_mode and f_flags may be used | |
590 | * | |
591 | * Returns 0. | |
592 | * | |
593 | * Note: may block (uninterruptible) if error recovery is underway | |
594 | * on this disk. | |
595 | **/ | |
596 | static int sd_release(struct inode *inode, struct file *filp) | |
597 | { | |
598 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
599 | struct scsi_disk *sdkp = scsi_disk(disk); | |
600 | struct scsi_device *sdev = sdkp->device; | |
601 | ||
56937f7b | 602 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); |
1da177e4 LT |
603 | |
604 | if (!--sdkp->openers && sdev->removable) { | |
605 | if (scsi_block_when_processing_errors(sdev)) | |
606 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
607 | } | |
608 | ||
609 | /* | |
610 | * XXX and what if there are packets in flight and this close() | |
611 | * XXX is followed by a "rmmod sd_mod"? | |
612 | */ | |
613 | scsi_disk_put(sdkp); | |
614 | return 0; | |
615 | } | |
616 | ||
a885c8c4 | 617 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
618 | { |
619 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
620 | struct scsi_device *sdp = sdkp->device; | |
621 | struct Scsi_Host *host = sdp->host; | |
622 | int diskinfo[4]; | |
623 | ||
624 | /* default to most commonly used values */ | |
625 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
626 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
627 | diskinfo[2] = sdkp->capacity >> 11; | |
628 | ||
629 | /* override with calculated, extended default, or driver values */ | |
630 | if (host->hostt->bios_param) | |
631 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
632 | else | |
633 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
634 | ||
a885c8c4 CH |
635 | geo->heads = diskinfo[0]; |
636 | geo->sectors = diskinfo[1]; | |
637 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
638 | return 0; |
639 | } | |
640 | ||
641 | /** | |
642 | * sd_ioctl - process an ioctl | |
643 | * @inode: only i_rdev/i_bdev members may be used | |
644 | * @filp: only f_mode and f_flags may be used | |
645 | * @cmd: ioctl command number | |
646 | * @arg: this is third argument given to ioctl(2) system call. | |
647 | * Often contains a pointer. | |
648 | * | |
649 | * Returns 0 if successful (some ioctls return postive numbers on | |
650 | * success as well). Returns a negated errno value in case of error. | |
651 | * | |
652 | * Note: most ioctls are forward onto the block subsystem or further | |
653 | * down in the scsi subsytem. | |
654 | **/ | |
655 | static int sd_ioctl(struct inode * inode, struct file * filp, | |
656 | unsigned int cmd, unsigned long arg) | |
657 | { | |
658 | struct block_device *bdev = inode->i_bdev; | |
659 | struct gendisk *disk = bdev->bd_disk; | |
660 | struct scsi_device *sdp = scsi_disk(disk)->device; | |
661 | void __user *p = (void __user *)arg; | |
662 | int error; | |
663 | ||
664 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", | |
665 | disk->disk_name, cmd)); | |
666 | ||
667 | /* | |
668 | * If we are in the middle of error recovery, don't let anyone | |
669 | * else try and use this device. Also, if error recovery fails, it | |
670 | * may try and take the device offline, in which case all further | |
671 | * access to the device is prohibited. | |
672 | */ | |
673 | error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); | |
674 | if (!scsi_block_when_processing_errors(sdp) || !error) | |
675 | return error; | |
676 | ||
1da177e4 LT |
677 | /* |
678 | * Send SCSI addressing ioctls directly to mid level, send other | |
679 | * ioctls to block level and then onto mid level if they can't be | |
680 | * resolved. | |
681 | */ | |
682 | switch (cmd) { | |
683 | case SCSI_IOCTL_GET_IDLUN: | |
684 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
685 | return scsi_ioctl(sdp, cmd, p); | |
686 | default: | |
45e79a3a | 687 | error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p); |
1da177e4 LT |
688 | if (error != -ENOTTY) |
689 | return error; | |
690 | } | |
691 | return scsi_ioctl(sdp, cmd, p); | |
692 | } | |
693 | ||
694 | static void set_media_not_present(struct scsi_disk *sdkp) | |
695 | { | |
696 | sdkp->media_present = 0; | |
697 | sdkp->capacity = 0; | |
698 | sdkp->device->changed = 1; | |
699 | } | |
700 | ||
701 | /** | |
702 | * sd_media_changed - check if our medium changed | |
703 | * @disk: kernel device descriptor | |
704 | * | |
705 | * Returns 0 if not applicable or no change; 1 if change | |
706 | * | |
707 | * Note: this function is invoked from the block subsystem. | |
708 | **/ | |
709 | static int sd_media_changed(struct gendisk *disk) | |
710 | { | |
711 | struct scsi_disk *sdkp = scsi_disk(disk); | |
712 | struct scsi_device *sdp = sdkp->device; | |
713 | int retval; | |
714 | ||
fa0d34be | 715 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); |
1da177e4 LT |
716 | |
717 | if (!sdp->removable) | |
718 | return 0; | |
719 | ||
720 | /* | |
721 | * If the device is offline, don't send any commands - just pretend as | |
722 | * if the command failed. If the device ever comes back online, we | |
723 | * can deal with it then. It is only because of unrecoverable errors | |
724 | * that we would ever take a device offline in the first place. | |
725 | */ | |
726 | if (!scsi_device_online(sdp)) | |
727 | goto not_present; | |
728 | ||
729 | /* | |
730 | * Using TEST_UNIT_READY enables differentiation between drive with | |
731 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
732 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
733 | * | |
734 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
735 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
736 | * sd_revalidate() is called. | |
737 | */ | |
738 | retval = -ENODEV; | |
739 | if (scsi_block_when_processing_errors(sdp)) | |
740 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES); | |
741 | ||
742 | /* | |
743 | * Unable to test, unit probably not ready. This usually | |
744 | * means there is no disc in the drive. Mark as changed, | |
745 | * and we will figure it out later once the drive is | |
746 | * available again. | |
747 | */ | |
748 | if (retval) | |
749 | goto not_present; | |
750 | ||
751 | /* | |
752 | * For removable scsi disk we have to recognise the presence | |
753 | * of a disk in the drive. This is kept in the struct scsi_disk | |
754 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
755 | */ | |
756 | sdkp->media_present = 1; | |
757 | ||
758 | retval = sdp->changed; | |
759 | sdp->changed = 0; | |
760 | ||
761 | return retval; | |
762 | ||
763 | not_present: | |
764 | set_media_not_present(sdkp); | |
765 | return 1; | |
766 | } | |
767 | ||
e73aec82 | 768 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1da177e4 | 769 | { |
1da177e4 | 770 | int retries, res; |
e73aec82 | 771 | struct scsi_device *sdp = sdkp->device; |
ea73a9f2 | 772 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
773 | |
774 | if (!scsi_device_online(sdp)) | |
775 | return -ENODEV; | |
776 | ||
1da177e4 | 777 | |
1da177e4 LT |
778 | for (retries = 3; retries > 0; --retries) { |
779 | unsigned char cmd[10] = { 0 }; | |
780 | ||
781 | cmd[0] = SYNCHRONIZE_CACHE; | |
782 | /* | |
783 | * Leave the rest of the command zero to indicate | |
784 | * flush everything. | |
785 | */ | |
ea73a9f2 JB |
786 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
787 | SD_TIMEOUT, SD_MAX_RETRIES); | |
788 | if (res == 0) | |
1da177e4 LT |
789 | break; |
790 | } | |
791 | ||
e73aec82 MP |
792 | if (res) { |
793 | sd_print_result(sdkp, res); | |
794 | if (driver_byte(res) & DRIVER_SENSE) | |
795 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
796 | } |
797 | ||
3721050a TH |
798 | if (res) |
799 | return -EIO; | |
800 | return 0; | |
1da177e4 LT |
801 | } |
802 | ||
803 | static int sd_issue_flush(struct device *dev, sector_t *error_sector) | |
804 | { | |
39b7f1e2 | 805 | int ret = 0; |
39b7f1e2 | 806 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
807 | |
808 | if (!sdkp) | |
809 | return -ENODEV; | |
810 | ||
39b7f1e2 | 811 | if (sdkp->WCE) |
e73aec82 | 812 | ret = sd_sync_cache(sdkp); |
39b7f1e2 AS |
813 | scsi_disk_put(sdkp); |
814 | return ret; | |
1da177e4 LT |
815 | } |
816 | ||
165125e1 | 817 | static void sd_prepare_flush(struct request_queue *q, struct request *rq) |
1da177e4 | 818 | { |
c0ed79a3 | 819 | memset(rq->cmd, 0, sizeof(rq->cmd)); |
4aff5e23 | 820 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
c0ed79a3 JB |
821 | rq->timeout = SD_TIMEOUT; |
822 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
461d4e90 | 823 | rq->cmd_len = 10; |
1da177e4 LT |
824 | } |
825 | ||
826 | static void sd_rescan(struct device *dev) | |
827 | { | |
39b7f1e2 AS |
828 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
829 | ||
830 | if (sdkp) { | |
831 | sd_revalidate_disk(sdkp->disk); | |
832 | scsi_disk_put(sdkp); | |
833 | } | |
1da177e4 LT |
834 | } |
835 | ||
836 | ||
837 | #ifdef CONFIG_COMPAT | |
838 | /* | |
839 | * This gets directly called from VFS. When the ioctl | |
840 | * is not recognized we go back to the other translation paths. | |
841 | */ | |
842 | static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
843 | { | |
7ac6207b | 844 | struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev; |
1da177e4 LT |
845 | struct gendisk *disk = bdev->bd_disk; |
846 | struct scsi_device *sdev = scsi_disk(disk)->device; | |
847 | ||
848 | /* | |
849 | * If we are in the middle of error recovery, don't let anyone | |
850 | * else try and use this device. Also, if error recovery fails, it | |
851 | * may try and take the device offline, in which case all further | |
852 | * access to the device is prohibited. | |
853 | */ | |
854 | if (!scsi_block_when_processing_errors(sdev)) | |
855 | return -ENODEV; | |
856 | ||
857 | if (sdev->host->hostt->compat_ioctl) { | |
858 | int ret; | |
859 | ||
860 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
861 | ||
862 | return ret; | |
863 | } | |
864 | ||
865 | /* | |
866 | * Let the static ioctl translation table take care of it. | |
867 | */ | |
868 | return -ENOIOCTLCMD; | |
869 | } | |
870 | #endif | |
871 | ||
872 | static struct block_device_operations sd_fops = { | |
873 | .owner = THIS_MODULE, | |
874 | .open = sd_open, | |
875 | .release = sd_release, | |
876 | .ioctl = sd_ioctl, | |
a885c8c4 | 877 | .getgeo = sd_getgeo, |
1da177e4 LT |
878 | #ifdef CONFIG_COMPAT |
879 | .compat_ioctl = sd_compat_ioctl, | |
880 | #endif | |
881 | .media_changed = sd_media_changed, | |
882 | .revalidate_disk = sd_revalidate_disk, | |
883 | }; | |
884 | ||
885 | /** | |
886 | * sd_rw_intr - bottom half handler: called when the lower level | |
887 | * driver has completed (successfully or otherwise) a scsi command. | |
888 | * @SCpnt: mid-level's per command structure. | |
889 | * | |
890 | * Note: potentially run from within an ISR. Must not block. | |
891 | **/ | |
892 | static void sd_rw_intr(struct scsi_cmnd * SCpnt) | |
893 | { | |
894 | int result = SCpnt->result; | |
03aba2f7 LT |
895 | unsigned int xfer_size = SCpnt->request_bufflen; |
896 | unsigned int good_bytes = result ? 0 : xfer_size; | |
897 | u64 start_lba = SCpnt->request->sector; | |
898 | u64 bad_lba; | |
1da177e4 LT |
899 | struct scsi_sense_hdr sshdr; |
900 | int sense_valid = 0; | |
901 | int sense_deferred = 0; | |
902 | int info_valid; | |
903 | ||
904 | if (result) { | |
905 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
906 | if (sense_valid) | |
907 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
908 | } | |
1da177e4 | 909 | #ifdef CONFIG_SCSI_LOGGING |
fa0d34be | 910 | SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
1da177e4 | 911 | if (sense_valid) { |
fa0d34be MP |
912 | SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
913 | "sd_rw_intr: sb[respc,sk,asc," | |
914 | "ascq]=%x,%x,%x,%x\n", | |
915 | sshdr.response_code, | |
916 | sshdr.sense_key, sshdr.asc, | |
917 | sshdr.ascq)); | |
1da177e4 LT |
918 | } |
919 | #endif | |
03aba2f7 LT |
920 | if (driver_byte(result) != DRIVER_SENSE && |
921 | (!sense_valid || sense_deferred)) | |
922 | goto out; | |
923 | ||
924 | switch (sshdr.sense_key) { | |
925 | case HARDWARE_ERROR: | |
926 | case MEDIUM_ERROR: | |
927 | if (!blk_fs_request(SCpnt->request)) | |
928 | goto out; | |
929 | info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, | |
930 | SCSI_SENSE_BUFFERSIZE, | |
931 | &bad_lba); | |
932 | if (!info_valid) | |
933 | goto out; | |
934 | if (xfer_size <= SCpnt->device->sector_size) | |
935 | goto out; | |
936 | switch (SCpnt->device->sector_size) { | |
937 | case 256: | |
938 | start_lba <<= 1; | |
1da177e4 | 939 | break; |
03aba2f7 | 940 | case 512: |
1da177e4 | 941 | break; |
03aba2f7 LT |
942 | case 1024: |
943 | start_lba >>= 1; | |
944 | break; | |
945 | case 2048: | |
946 | start_lba >>= 2; | |
947 | break; | |
948 | case 4096: | |
949 | start_lba >>= 3; | |
1da177e4 | 950 | break; |
1da177e4 | 951 | default: |
03aba2f7 LT |
952 | /* Print something here with limiting frequency. */ |
953 | goto out; | |
1da177e4 LT |
954 | break; |
955 | } | |
03aba2f7 LT |
956 | /* This computation should always be done in terms of |
957 | * the resolution of the device's medium. | |
958 | */ | |
959 | good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; | |
960 | break; | |
961 | case RECOVERED_ERROR: | |
962 | case NO_SENSE: | |
963 | /* Inform the user, but make sure that it's not treated | |
964 | * as a hard error. | |
965 | */ | |
966 | scsi_print_sense("sd", SCpnt); | |
967 | SCpnt->result = 0; | |
968 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
969 | good_bytes = xfer_size; | |
970 | break; | |
971 | case ILLEGAL_REQUEST: | |
972 | if (SCpnt->device->use_10_for_rw && | |
973 | (SCpnt->cmnd[0] == READ_10 || | |
974 | SCpnt->cmnd[0] == WRITE_10)) | |
975 | SCpnt->device->use_10_for_rw = 0; | |
976 | if (SCpnt->device->use_10_for_ms && | |
977 | (SCpnt->cmnd[0] == MODE_SENSE_10 || | |
978 | SCpnt->cmnd[0] == MODE_SELECT_10)) | |
979 | SCpnt->device->use_10_for_ms = 0; | |
980 | break; | |
981 | default: | |
982 | break; | |
1da177e4 | 983 | } |
03aba2f7 LT |
984 | out: |
985 | scsi_io_completion(SCpnt, good_bytes); | |
1da177e4 LT |
986 | } |
987 | ||
ea73a9f2 JB |
988 | static int media_not_present(struct scsi_disk *sdkp, |
989 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 990 | { |
1da177e4 | 991 | |
ea73a9f2 | 992 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
993 | return 0; |
994 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
995 | if (sshdr->sense_key != NOT_READY && |
996 | sshdr->sense_key != UNIT_ATTENTION) | |
997 | return 0; | |
998 | if (sshdr->asc != 0x3A) /* medium not present */ | |
999 | return 0; | |
1000 | ||
1da177e4 LT |
1001 | set_media_not_present(sdkp); |
1002 | return 1; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * spinup disk - called only in sd_revalidate_disk() | |
1007 | */ | |
1008 | static void | |
e73aec82 | 1009 | sd_spinup_disk(struct scsi_disk *sdkp) |
ea73a9f2 | 1010 | { |
1da177e4 | 1011 | unsigned char cmd[10]; |
4451e472 | 1012 | unsigned long spintime_expire = 0; |
1da177e4 LT |
1013 | int retries, spintime; |
1014 | unsigned int the_result; | |
1015 | struct scsi_sense_hdr sshdr; | |
1016 | int sense_valid = 0; | |
1017 | ||
1018 | spintime = 0; | |
1019 | ||
1020 | /* Spin up drives, as required. Only do this at boot time */ | |
1021 | /* Spinup needs to be done for module loads too. */ | |
1022 | do { | |
1023 | retries = 0; | |
1024 | ||
1025 | do { | |
1026 | cmd[0] = TEST_UNIT_READY; | |
1027 | memset((void *) &cmd[1], 0, 9); | |
1028 | ||
ea73a9f2 JB |
1029 | the_result = scsi_execute_req(sdkp->device, cmd, |
1030 | DMA_NONE, NULL, 0, | |
1031 | &sshdr, SD_TIMEOUT, | |
1032 | SD_MAX_RETRIES); | |
1da177e4 | 1033 | |
b4d38e38 AS |
1034 | /* |
1035 | * If the drive has indicated to us that it | |
1036 | * doesn't have any media in it, don't bother | |
1037 | * with any more polling. | |
1038 | */ | |
1039 | if (media_not_present(sdkp, &sshdr)) | |
1040 | return; | |
1041 | ||
1da177e4 | 1042 | if (the_result) |
ea73a9f2 | 1043 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1044 | retries++; |
1045 | } while (retries < 3 && | |
1046 | (!scsi_status_is_good(the_result) || | |
1047 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1048 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1049 | ||
1da177e4 LT |
1050 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1051 | /* no sense, TUR either succeeded or failed | |
1052 | * with a status error */ | |
e73aec82 MP |
1053 | if(!spintime && !scsi_status_is_good(the_result)) { |
1054 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); | |
1055 | sd_print_result(sdkp, the_result); | |
1056 | } | |
1da177e4 LT |
1057 | break; |
1058 | } | |
1059 | ||
1060 | /* | |
1061 | * The device does not want the automatic start to be issued. | |
1062 | */ | |
1063 | if (sdkp->device->no_start_on_add) { | |
1064 | break; | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * If manual intervention is required, or this is an | |
1069 | * absent USB storage device, a spinup is meaningless. | |
1070 | */ | |
1071 | if (sense_valid && | |
1072 | sshdr.sense_key == NOT_READY && | |
1073 | sshdr.asc == 4 && sshdr.ascq == 3) { | |
1074 | break; /* manual intervention required */ | |
1075 | ||
1076 | /* | |
1077 | * Issue command to spin up drive when not ready | |
1078 | */ | |
1079 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { | |
1080 | if (!spintime) { | |
e73aec82 | 1081 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1da177e4 LT |
1082 | cmd[0] = START_STOP; |
1083 | cmd[1] = 1; /* Return immediately */ | |
1084 | memset((void *) &cmd[2], 0, 8); | |
1085 | cmd[4] = 1; /* Start spin cycle */ | |
ea73a9f2 JB |
1086 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1087 | NULL, 0, &sshdr, | |
1088 | SD_TIMEOUT, SD_MAX_RETRIES); | |
4451e472 AS |
1089 | spintime_expire = jiffies + 100 * HZ; |
1090 | spintime = 1; | |
1da177e4 | 1091 | } |
1da177e4 LT |
1092 | /* Wait 1 second for next try */ |
1093 | msleep(1000); | |
1094 | printk("."); | |
4451e472 AS |
1095 | |
1096 | /* | |
1097 | * Wait for USB flash devices with slow firmware. | |
1098 | * Yes, this sense key/ASC combination shouldn't | |
1099 | * occur here. It's characteristic of these devices. | |
1100 | */ | |
1101 | } else if (sense_valid && | |
1102 | sshdr.sense_key == UNIT_ATTENTION && | |
1103 | sshdr.asc == 0x28) { | |
1104 | if (!spintime) { | |
1105 | spintime_expire = jiffies + 5 * HZ; | |
1106 | spintime = 1; | |
1107 | } | |
1108 | /* Wait 1 second for next try */ | |
1109 | msleep(1000); | |
1da177e4 LT |
1110 | } else { |
1111 | /* we don't understand the sense code, so it's | |
1112 | * probably pointless to loop */ | |
1113 | if(!spintime) { | |
e73aec82 MP |
1114 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1115 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1116 | } |
1117 | break; | |
1118 | } | |
1119 | ||
4451e472 | 1120 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1121 | |
1122 | if (spintime) { | |
1123 | if (scsi_status_is_good(the_result)) | |
1124 | printk("ready\n"); | |
1125 | else | |
1126 | printk("not responding...\n"); | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * read disk capacity | |
1132 | */ | |
1133 | static void | |
e73aec82 | 1134 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1135 | { |
1da177e4 | 1136 | unsigned char cmd[16]; |
1da177e4 LT |
1137 | int the_result, retries; |
1138 | int sector_size = 0; | |
1139 | int longrc = 0; | |
1140 | struct scsi_sense_hdr sshdr; | |
1141 | int sense_valid = 0; | |
ea73a9f2 | 1142 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1143 | |
1144 | repeat: | |
1145 | retries = 3; | |
1146 | do { | |
1147 | if (longrc) { | |
1148 | memset((void *) cmd, 0, 16); | |
1149 | cmd[0] = SERVICE_ACTION_IN; | |
1150 | cmd[1] = SAI_READ_CAPACITY_16; | |
1151 | cmd[13] = 12; | |
1152 | memset((void *) buffer, 0, 12); | |
1153 | } else { | |
1154 | cmd[0] = READ_CAPACITY; | |
1155 | memset((void *) &cmd[1], 0, 9); | |
1156 | memset((void *) buffer, 0, 8); | |
1157 | } | |
1158 | ||
ea73a9f2 JB |
1159 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
1160 | buffer, longrc ? 12 : 8, &sshdr, | |
1161 | SD_TIMEOUT, SD_MAX_RETRIES); | |
1da177e4 | 1162 | |
ea73a9f2 | 1163 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1164 | return; |
1165 | ||
1da177e4 | 1166 | if (the_result) |
ea73a9f2 | 1167 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1168 | retries--; |
1169 | ||
1170 | } while (the_result && retries); | |
1171 | ||
1172 | if (the_result && !longrc) { | |
e73aec82 MP |
1173 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); |
1174 | sd_print_result(sdkp, the_result); | |
1da177e4 | 1175 | if (driver_byte(the_result) & DRIVER_SENSE) |
e73aec82 | 1176 | sd_print_sense_hdr(sdkp, &sshdr); |
1da177e4 | 1177 | else |
e73aec82 | 1178 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); |
1da177e4 LT |
1179 | |
1180 | /* Set dirty bit for removable devices if not ready - | |
1181 | * sometimes drives will not report this properly. */ | |
1182 | if (sdp->removable && | |
1183 | sense_valid && sshdr.sense_key == NOT_READY) | |
1184 | sdp->changed = 1; | |
1185 | ||
1186 | /* Either no media are present but the drive didn't tell us, | |
1187 | or they are present but the read capacity command fails */ | |
1188 | /* sdkp->media_present = 0; -- not always correct */ | |
69bdd88c | 1189 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ |
1da177e4 LT |
1190 | |
1191 | return; | |
1192 | } else if (the_result && longrc) { | |
1193 | /* READ CAPACITY(16) has been failed */ | |
e73aec82 MP |
1194 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
1195 | sd_print_result(sdkp, the_result); | |
1196 | sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); | |
1197 | ||
1da177e4 LT |
1198 | sdkp->capacity = 1 + (sector_t) 0xffffffff; |
1199 | goto got_data; | |
1200 | } | |
1201 | ||
1202 | if (!longrc) { | |
1203 | sector_size = (buffer[4] << 24) | | |
1204 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
1205 | if (buffer[0] == 0xff && buffer[1] == 0xff && | |
1206 | buffer[2] == 0xff && buffer[3] == 0xff) { | |
1207 | if(sizeof(sdkp->capacity) > 4) { | |
e73aec82 MP |
1208 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " |
1209 | "Trying to use READ CAPACITY(16).\n"); | |
1da177e4 LT |
1210 | longrc = 1; |
1211 | goto repeat; | |
1212 | } | |
e73aec82 MP |
1213 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " |
1214 | "a kernel compiled with support for large " | |
1215 | "block devices.\n"); | |
1da177e4 LT |
1216 | sdkp->capacity = 0; |
1217 | goto got_data; | |
1218 | } | |
1219 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | | |
1220 | (buffer[1] << 16) | | |
1221 | (buffer[2] << 8) | | |
1222 | buffer[3]); | |
1223 | } else { | |
1224 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | | |
1225 | ((u64)buffer[1] << 48) | | |
1226 | ((u64)buffer[2] << 40) | | |
1227 | ((u64)buffer[3] << 32) | | |
1228 | ((sector_t)buffer[4] << 24) | | |
1229 | ((sector_t)buffer[5] << 16) | | |
1230 | ((sector_t)buffer[6] << 8) | | |
1231 | (sector_t)buffer[7]); | |
1232 | ||
1233 | sector_size = (buffer[8] << 24) | | |
1234 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; | |
1235 | } | |
1236 | ||
1237 | /* Some devices return the total number of sectors, not the | |
1238 | * highest sector number. Make the necessary adjustment. */ | |
61bf54b7 | 1239 | if (sdp->fix_capacity) { |
1da177e4 LT |
1240 | --sdkp->capacity; |
1241 | ||
61bf54b7 ON |
1242 | /* Some devices have version which report the correct sizes |
1243 | * and others which do not. We guess size according to a heuristic | |
1244 | * and err on the side of lowering the capacity. */ | |
1245 | } else { | |
1246 | if (sdp->guess_capacity) | |
1247 | if (sdkp->capacity & 0x01) /* odd sizes are odd */ | |
1248 | --sdkp->capacity; | |
1249 | } | |
1250 | ||
1da177e4 LT |
1251 | got_data: |
1252 | if (sector_size == 0) { | |
1253 | sector_size = 512; | |
e73aec82 MP |
1254 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
1255 | "assuming 512.\n"); | |
1da177e4 LT |
1256 | } |
1257 | ||
1258 | if (sector_size != 512 && | |
1259 | sector_size != 1024 && | |
1260 | sector_size != 2048 && | |
1261 | sector_size != 4096 && | |
1262 | sector_size != 256) { | |
e73aec82 MP |
1263 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
1264 | sector_size); | |
1da177e4 LT |
1265 | /* |
1266 | * The user might want to re-format the drive with | |
1267 | * a supported sectorsize. Once this happens, it | |
1268 | * would be relatively trivial to set the thing up. | |
1269 | * For this reason, we leave the thing in the table. | |
1270 | */ | |
1271 | sdkp->capacity = 0; | |
1272 | /* | |
1273 | * set a bogus sector size so the normal read/write | |
1274 | * logic in the block layer will eventually refuse any | |
1275 | * request on this device without tripping over power | |
1276 | * of two sector size assumptions | |
1277 | */ | |
1278 | sector_size = 512; | |
1279 | } | |
1280 | { | |
1281 | /* | |
1282 | * The msdos fs needs to know the hardware sector size | |
1283 | * So I have created this table. See ll_rw_blk.c | |
1284 | * Jacques Gelinas (Jacques@solucorp.qc.ca) | |
1285 | */ | |
1286 | int hard_sector = sector_size; | |
7a691bd3 | 1287 | sector_t sz = (sdkp->capacity/2) * (hard_sector/256); |
165125e1 | 1288 | struct request_queue *queue = sdp->request_queue; |
7a691bd3 | 1289 | sector_t mb = sz; |
1da177e4 LT |
1290 | |
1291 | blk_queue_hardsect_size(queue, hard_sector); | |
1292 | /* avoid 64-bit division on 32-bit platforms */ | |
7a691bd3 | 1293 | sector_div(sz, 625); |
1da177e4 LT |
1294 | mb -= sz - 974; |
1295 | sector_div(mb, 1950); | |
1296 | ||
e73aec82 MP |
1297 | sd_printk(KERN_NOTICE, sdkp, |
1298 | "%llu %d-byte hardware sectors (%llu MB)\n", | |
1299 | (unsigned long long)sdkp->capacity, | |
1300 | hard_sector, (unsigned long long)mb); | |
1da177e4 LT |
1301 | } |
1302 | ||
1303 | /* Rescale capacity to 512-byte units */ | |
1304 | if (sector_size == 4096) | |
1305 | sdkp->capacity <<= 3; | |
1306 | else if (sector_size == 2048) | |
1307 | sdkp->capacity <<= 2; | |
1308 | else if (sector_size == 1024) | |
1309 | sdkp->capacity <<= 1; | |
1310 | else if (sector_size == 256) | |
1311 | sdkp->capacity >>= 1; | |
1312 | ||
1313 | sdkp->device->sector_size = sector_size; | |
1314 | } | |
1315 | ||
1316 | /* called with buffer of length 512 */ | |
1317 | static inline int | |
ea73a9f2 JB |
1318 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1319 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1320 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1321 | { |
ea73a9f2 | 1322 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1323 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1324 | sshdr); |
1da177e4 LT |
1325 | } |
1326 | ||
1327 | /* | |
1328 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1329 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1330 | */ |
1331 | static void | |
e73aec82 | 1332 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1333 | { |
1da177e4 | 1334 | int res; |
ea73a9f2 | 1335 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1336 | struct scsi_mode_data data; |
1337 | ||
1338 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1339 | if (sdp->skip_ms_page_3f) { |
e73aec82 | 1340 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
1da177e4 LT |
1341 | return; |
1342 | } | |
1343 | ||
ea73a9f2 JB |
1344 | if (sdp->use_192_bytes_for_3f) { |
1345 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1346 | } else { |
1347 | /* | |
1348 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1349 | * We have to start carefully: some devices hang if we ask | |
1350 | * for more than is available. | |
1351 | */ | |
ea73a9f2 | 1352 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1353 | |
1354 | /* | |
1355 | * Second attempt: ask for page 0 When only page 0 is | |
1356 | * implemented, a request for page 3F may return Sense Key | |
1357 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1358 | * CDB. | |
1359 | */ | |
1360 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1361 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1362 | |
1363 | /* | |
1364 | * Third attempt: ask 255 bytes, as we did earlier. | |
1365 | */ | |
1366 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1367 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1368 | &data, NULL); | |
1da177e4 LT |
1369 | } |
1370 | ||
1371 | if (!scsi_status_is_good(res)) { | |
e73aec82 MP |
1372 | sd_printk(KERN_WARNING, sdkp, |
1373 | "Test WP failed, assume Write Enabled\n"); | |
1da177e4 LT |
1374 | } else { |
1375 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1376 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
e73aec82 MP |
1377 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", |
1378 | sdkp->write_prot ? "on" : "off"); | |
1379 | sd_printk(KERN_DEBUG, sdkp, | |
1380 | "Mode Sense: %02x %02x %02x %02x\n", | |
1381 | buffer[0], buffer[1], buffer[2], buffer[3]); | |
1da177e4 LT |
1382 | } |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1387 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1388 | */ |
1389 | static void | |
e73aec82 | 1390 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
631e8a13 | 1391 | { |
1da177e4 | 1392 | int len = 0, res; |
ea73a9f2 | 1393 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1394 | |
631e8a13 AV |
1395 | int dbd; |
1396 | int modepage; | |
1da177e4 LT |
1397 | struct scsi_mode_data data; |
1398 | struct scsi_sense_hdr sshdr; | |
1399 | ||
ea73a9f2 | 1400 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1401 | goto defaults; |
1402 | ||
ea73a9f2 | 1403 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1404 | modepage = 6; |
1405 | dbd = 8; | |
1406 | } else { | |
1407 | modepage = 8; | |
1408 | dbd = 0; | |
1409 | } | |
1410 | ||
1da177e4 | 1411 | /* cautiously ask */ |
ea73a9f2 | 1412 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1413 | |
1414 | if (!scsi_status_is_good(res)) | |
1415 | goto bad_sense; | |
1416 | ||
6d73c851 AV |
1417 | if (!data.header_length) { |
1418 | modepage = 6; | |
e73aec82 | 1419 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
6d73c851 AV |
1420 | } |
1421 | ||
1da177e4 LT |
1422 | /* that went OK, now ask for the proper length */ |
1423 | len = data.length; | |
1424 | ||
1425 | /* | |
1426 | * We're only interested in the first three bytes, actually. | |
1427 | * But the data cache page is defined for the first 20. | |
1428 | */ | |
1429 | if (len < 3) | |
1430 | goto bad_sense; | |
1431 | if (len > 20) | |
1432 | len = 20; | |
1433 | ||
1434 | /* Take headers and block descriptors into account */ | |
1435 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1436 | if (len > SD_BUF_SIZE) |
1437 | goto bad_sense; | |
1da177e4 LT |
1438 | |
1439 | /* Get the data */ | |
ea73a9f2 | 1440 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1441 | |
1442 | if (scsi_status_is_good(res)) { | |
631e8a13 | 1443 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1444 | |
48970800 | 1445 | if (offset >= SD_BUF_SIZE - 2) { |
e73aec82 | 1446 | sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); |
48970800 AV |
1447 | goto defaults; |
1448 | } | |
1449 | ||
631e8a13 | 1450 | if ((buffer[offset] & 0x3f) != modepage) { |
e73aec82 | 1451 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
631e8a13 AV |
1452 | goto defaults; |
1453 | } | |
1454 | ||
1455 | if (modepage == 8) { | |
1456 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1457 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1458 | } else { | |
1459 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1460 | sdkp->RCD = 0; | |
1461 | } | |
1da177e4 | 1462 | |
007365ad TH |
1463 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1464 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
e73aec82 MP |
1465 | sd_printk(KERN_NOTICE, sdkp, |
1466 | "Uses READ/WRITE(6), disabling FUA\n"); | |
007365ad TH |
1467 | sdkp->DPOFUA = 0; |
1468 | } | |
1469 | ||
e73aec82 MP |
1470 | sd_printk(KERN_NOTICE, sdkp, |
1471 | "Write cache: %s, read cache: %s, %s\n", | |
fd44bab5 LT |
1472 | sdkp->WCE ? "enabled" : "disabled", |
1473 | sdkp->RCD ? "disabled" : "enabled", | |
1474 | sdkp->DPOFUA ? "supports DPO and FUA" | |
1475 | : "doesn't support DPO or FUA"); | |
1da177e4 LT |
1476 | |
1477 | return; | |
1478 | } | |
1479 | ||
1480 | bad_sense: | |
ea73a9f2 | 1481 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1482 | sshdr.sense_key == ILLEGAL_REQUEST && |
1483 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
e73aec82 MP |
1484 | /* Invalid field in CDB */ |
1485 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); | |
1da177e4 | 1486 | else |
e73aec82 | 1487 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
1da177e4 LT |
1488 | |
1489 | defaults: | |
e73aec82 | 1490 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); |
1da177e4 LT |
1491 | sdkp->WCE = 0; |
1492 | sdkp->RCD = 0; | |
48970800 | 1493 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | /** | |
1497 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1498 | * performs disk spin up, read_capacity, etc. | |
1499 | * @disk: struct gendisk we care about | |
1500 | **/ | |
1501 | static int sd_revalidate_disk(struct gendisk *disk) | |
1502 | { | |
1503 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1504 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 1505 | unsigned char *buffer; |
461d4e90 | 1506 | unsigned ordered; |
1da177e4 | 1507 | |
fa0d34be MP |
1508 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
1509 | "sd_revalidate_disk\n")); | |
1da177e4 LT |
1510 | |
1511 | /* | |
1512 | * If the device is offline, don't try and read capacity or any | |
1513 | * of the other niceties. | |
1514 | */ | |
1515 | if (!scsi_device_online(sdp)) | |
1516 | goto out; | |
1517 | ||
a6123f14 | 1518 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); |
1da177e4 | 1519 | if (!buffer) { |
e73aec82 MP |
1520 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
1521 | "allocation failure.\n"); | |
ea73a9f2 | 1522 | goto out; |
1da177e4 LT |
1523 | } |
1524 | ||
1525 | /* defaults, until the device tells us otherwise */ | |
1526 | sdp->sector_size = 512; | |
1527 | sdkp->capacity = 0; | |
1528 | sdkp->media_present = 1; | |
1529 | sdkp->write_prot = 0; | |
1530 | sdkp->WCE = 0; | |
1531 | sdkp->RCD = 0; | |
1532 | ||
e73aec82 | 1533 | sd_spinup_disk(sdkp); |
1da177e4 LT |
1534 | |
1535 | /* | |
1536 | * Without media there is no reason to ask; moreover, some devices | |
1537 | * react badly if we do. | |
1538 | */ | |
1539 | if (sdkp->media_present) { | |
e73aec82 MP |
1540 | sd_read_capacity(sdkp, buffer); |
1541 | sd_read_write_protect_flag(sdkp, buffer); | |
1542 | sd_read_cache_type(sdkp, buffer); | |
1da177e4 | 1543 | } |
461d4e90 TH |
1544 | |
1545 | /* | |
1546 | * We now have all cache related info, determine how we deal | |
1547 | * with ordered requests. Note that as the current SCSI | |
1548 | * dispatch function can alter request order, we cannot use | |
1549 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
1550 | */ | |
1551 | if (sdkp->WCE) | |
007365ad TH |
1552 | ordered = sdkp->DPOFUA |
1553 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
1554 | else |
1555 | ordered = QUEUE_ORDERED_DRAIN; | |
1556 | ||
1557 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
1558 | ||
1da177e4 LT |
1559 | set_capacity(disk, sdkp->capacity); |
1560 | kfree(buffer); | |
1561 | ||
1da177e4 LT |
1562 | out: |
1563 | return 0; | |
1564 | } | |
1565 | ||
1566 | /** | |
1567 | * sd_probe - called during driver initialization and whenever a | |
1568 | * new scsi device is attached to the system. It is called once | |
1569 | * for each scsi device (not just disks) present. | |
1570 | * @dev: pointer to device object | |
1571 | * | |
1572 | * Returns 0 if successful (or not interested in this scsi device | |
1573 | * (e.g. scanner)); 1 when there is an error. | |
1574 | * | |
1575 | * Note: this function is invoked from the scsi mid-level. | |
1576 | * This function sets up the mapping between a given | |
1577 | * <host,channel,id,lun> (found in sdp) and new device name | |
1578 | * (e.g. /dev/sda). More precisely it is the block device major | |
1579 | * and minor number that is chosen here. | |
1580 | * | |
1581 | * Assume sd_attach is not re-entrant (for time being) | |
1582 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
1583 | **/ | |
1584 | static int sd_probe(struct device *dev) | |
1585 | { | |
1586 | struct scsi_device *sdp = to_scsi_device(dev); | |
1587 | struct scsi_disk *sdkp; | |
1588 | struct gendisk *gd; | |
1589 | u32 index; | |
1590 | int error; | |
1591 | ||
1592 | error = -ENODEV; | |
631e8a13 | 1593 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
1594 | goto out; |
1595 | ||
9ccfc756 JB |
1596 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
1597 | "sd_attach\n")); | |
1da177e4 LT |
1598 | |
1599 | error = -ENOMEM; | |
24669f75 | 1600 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
1601 | if (!sdkp) |
1602 | goto out; | |
1603 | ||
1da177e4 LT |
1604 | gd = alloc_disk(16); |
1605 | if (!gd) | |
1606 | goto out_free; | |
1607 | ||
1608 | if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) | |
1609 | goto out_put; | |
1610 | ||
1611 | spin_lock(&sd_index_lock); | |
1612 | error = idr_get_new(&sd_index_idr, NULL, &index); | |
1613 | spin_unlock(&sd_index_lock); | |
1614 | ||
1615 | if (index >= SD_MAX_DISKS) | |
1616 | error = -EBUSY; | |
1617 | if (error) | |
1618 | goto out_put; | |
1619 | ||
1620 | sdkp->device = sdp; | |
1621 | sdkp->driver = &sd_template; | |
1622 | sdkp->disk = gd; | |
1623 | sdkp->index = index; | |
1624 | sdkp->openers = 0; | |
1625 | ||
1626 | if (!sdp->timeout) { | |
631e8a13 | 1627 | if (sdp->type != TYPE_MOD) |
1da177e4 LT |
1628 | sdp->timeout = SD_TIMEOUT; |
1629 | else | |
1630 | sdp->timeout = SD_MOD_TIMEOUT; | |
1631 | } | |
1632 | ||
017f2e37 NST |
1633 | class_device_initialize(&sdkp->cdev); |
1634 | sdkp->cdev.dev = &sdp->sdev_gendev; | |
1635 | sdkp->cdev.class = &sd_disk_class; | |
1636 | strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); | |
1637 | ||
1638 | if (class_device_add(&sdkp->cdev)) | |
1639 | goto out_put; | |
1640 | ||
1641 | get_device(&sdp->sdev_gendev); | |
1642 | ||
1da177e4 LT |
1643 | gd->major = sd_major((index & 0xf0) >> 4); |
1644 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
1645 | gd->minors = 16; | |
1646 | gd->fops = &sd_fops; | |
1647 | ||
1648 | if (index < 26) { | |
1649 | sprintf(gd->disk_name, "sd%c", 'a' + index % 26); | |
1650 | } else if (index < (26 + 1) * 26) { | |
1651 | sprintf(gd->disk_name, "sd%c%c", | |
1652 | 'a' + index / 26 - 1,'a' + index % 26); | |
1653 | } else { | |
1654 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
1655 | const unsigned int m2 = (index / 26 - 1) % 26; | |
1656 | const unsigned int m3 = index % 26; | |
1657 | sprintf(gd->disk_name, "sd%c%c%c", | |
1658 | 'a' + m1, 'a' + m2, 'a' + m3); | |
1659 | } | |
1660 | ||
1da177e4 | 1661 | gd->private_data = &sdkp->driver; |
461d4e90 | 1662 | gd->queue = sdkp->device->request_queue; |
1da177e4 LT |
1663 | |
1664 | sd_revalidate_disk(gd); | |
1665 | ||
1666 | gd->driverfs_dev = &sdp->sdev_gendev; | |
1667 | gd->flags = GENHD_FL_DRIVERFS; | |
1668 | if (sdp->removable) | |
1669 | gd->flags |= GENHD_FL_REMOVABLE; | |
1da177e4 LT |
1670 | |
1671 | dev_set_drvdata(dev, sdkp); | |
1672 | add_disk(gd); | |
1673 | ||
e73aec82 MP |
1674 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
1675 | sdp->removable ? "removable " : ""); | |
1da177e4 LT |
1676 | |
1677 | return 0; | |
1678 | ||
6bdaa1f1 | 1679 | out_put: |
1da177e4 | 1680 | put_disk(gd); |
6bdaa1f1 | 1681 | out_free: |
1da177e4 | 1682 | kfree(sdkp); |
6bdaa1f1 | 1683 | out: |
1da177e4 LT |
1684 | return error; |
1685 | } | |
1686 | ||
1687 | /** | |
1688 | * sd_remove - called whenever a scsi disk (previously recognized by | |
1689 | * sd_probe) is detached from the system. It is called (potentially | |
1690 | * multiple times) during sd module unload. | |
1691 | * @sdp: pointer to mid level scsi device object | |
1692 | * | |
1693 | * Note: this function is invoked from the scsi mid-level. | |
1694 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
1695 | * that could be re-used by a subsequent sd_probe(). | |
1696 | * This function is not called when the built-in sd driver is "exit-ed". | |
1697 | **/ | |
1698 | static int sd_remove(struct device *dev) | |
1699 | { | |
1700 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1701 | ||
6bdaa1f1 | 1702 | class_device_del(&sdkp->cdev); |
1da177e4 LT |
1703 | del_gendisk(sdkp->disk); |
1704 | sd_shutdown(dev); | |
39b7f1e2 | 1705 | |
0b950672 | 1706 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 1707 | dev_set_drvdata(dev, NULL); |
6bdaa1f1 | 1708 | class_device_put(&sdkp->cdev); |
0b950672 | 1709 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
1710 | |
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | /** | |
1715 | * scsi_disk_release - Called to free the scsi_disk structure | |
6bdaa1f1 | 1716 | * @cdev: pointer to embedded class device |
1da177e4 | 1717 | * |
0b950672 | 1718 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1719 | * called on last put, you should always use the scsi_disk_get() |
1720 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
6bdaa1f1 | 1721 | * and never do a direct class_device_put(). |
1da177e4 | 1722 | **/ |
6bdaa1f1 | 1723 | static void scsi_disk_release(struct class_device *cdev) |
1da177e4 | 1724 | { |
6bdaa1f1 | 1725 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
1da177e4 LT |
1726 | struct gendisk *disk = sdkp->disk; |
1727 | ||
1728 | spin_lock(&sd_index_lock); | |
1729 | idr_remove(&sd_index_idr, sdkp->index); | |
1730 | spin_unlock(&sd_index_lock); | |
1731 | ||
1732 | disk->private_data = NULL; | |
1da177e4 | 1733 | put_disk(disk); |
39b7f1e2 | 1734 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
1735 | |
1736 | kfree(sdkp); | |
1737 | } | |
1738 | ||
cc5d2c8c | 1739 | static int sd_start_stop_device(struct scsi_disk *sdkp, int start) |
c3c94c5a TH |
1740 | { |
1741 | unsigned char cmd[6] = { START_STOP }; /* START_VALID */ | |
1742 | struct scsi_sense_hdr sshdr; | |
cc5d2c8c | 1743 | struct scsi_device *sdp = sdkp->device; |
c3c94c5a TH |
1744 | int res; |
1745 | ||
1746 | if (start) | |
1747 | cmd[4] |= 1; /* START */ | |
1748 | ||
1749 | if (!scsi_device_online(sdp)) | |
1750 | return -ENODEV; | |
1751 | ||
1752 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, | |
1753 | SD_TIMEOUT, SD_MAX_RETRIES); | |
1754 | if (res) { | |
cc5d2c8c JB |
1755 | sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
1756 | sd_print_result(sdkp, res); | |
c3c94c5a | 1757 | if (driver_byte(res) & DRIVER_SENSE) |
cc5d2c8c | 1758 | sd_print_sense_hdr(sdkp, &sshdr); |
c3c94c5a TH |
1759 | } |
1760 | ||
1761 | return res; | |
1762 | } | |
1763 | ||
1da177e4 LT |
1764 | /* |
1765 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
1766 | * the normal SCSI command structure. Wait for the command to | |
1767 | * complete. | |
1768 | */ | |
1769 | static void sd_shutdown(struct device *dev) | |
1770 | { | |
39b7f1e2 | 1771 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
1772 | |
1773 | if (!sdkp) | |
1774 | return; /* this can happen */ | |
1775 | ||
39b7f1e2 | 1776 | if (sdkp->WCE) { |
e73aec82 MP |
1777 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
1778 | sd_sync_cache(sdkp); | |
39b7f1e2 | 1779 | } |
c3c94c5a | 1780 | |
cc5d2c8c JB |
1781 | if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { |
1782 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); | |
1783 | sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
1784 | } |
1785 | ||
39b7f1e2 AS |
1786 | scsi_disk_put(sdkp); |
1787 | } | |
1da177e4 | 1788 | |
c3c94c5a TH |
1789 | static int sd_suspend(struct device *dev, pm_message_t mesg) |
1790 | { | |
c3c94c5a | 1791 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 1792 | int ret = 0; |
c3c94c5a TH |
1793 | |
1794 | if (!sdkp) | |
1795 | return 0; /* this can happen */ | |
1796 | ||
1797 | if (sdkp->WCE) { | |
cc5d2c8c | 1798 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
c3c94c5a TH |
1799 | ret = sd_sync_cache(sdkp); |
1800 | if (ret) | |
09ff92fe | 1801 | goto done; |
c3c94c5a TH |
1802 | } |
1803 | ||
cc5d2c8c JB |
1804 | if (mesg.event == PM_EVENT_SUSPEND && |
1805 | sdkp->device->manage_start_stop) { | |
1806 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); | |
1807 | ret = sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
1808 | } |
1809 | ||
09ff92fe AS |
1810 | done: |
1811 | scsi_disk_put(sdkp); | |
1812 | return ret; | |
c3c94c5a TH |
1813 | } |
1814 | ||
1815 | static int sd_resume(struct device *dev) | |
1816 | { | |
c3c94c5a | 1817 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 1818 | int ret = 0; |
c3c94c5a | 1819 | |
cc5d2c8c | 1820 | if (!sdkp->device->manage_start_stop) |
09ff92fe | 1821 | goto done; |
c3c94c5a | 1822 | |
cc5d2c8c | 1823 | sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
09ff92fe | 1824 | ret = sd_start_stop_device(sdkp, 1); |
c3c94c5a | 1825 | |
09ff92fe AS |
1826 | done: |
1827 | scsi_disk_put(sdkp); | |
1828 | return ret; | |
c3c94c5a TH |
1829 | } |
1830 | ||
1da177e4 LT |
1831 | /** |
1832 | * init_sd - entry point for this driver (both when built in or when | |
1833 | * a module). | |
1834 | * | |
1835 | * Note: this function registers this driver with the scsi mid-level. | |
1836 | **/ | |
1837 | static int __init init_sd(void) | |
1838 | { | |
5e4009ba | 1839 | int majors = 0, i, err; |
1da177e4 LT |
1840 | |
1841 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
1842 | ||
1843 | for (i = 0; i < SD_MAJORS; i++) | |
1844 | if (register_blkdev(sd_major(i), "sd") == 0) | |
1845 | majors++; | |
1846 | ||
1847 | if (!majors) | |
1848 | return -ENODEV; | |
1849 | ||
5e4009ba JG |
1850 | err = class_register(&sd_disk_class); |
1851 | if (err) | |
1852 | goto err_out; | |
6bdaa1f1 | 1853 | |
5e4009ba JG |
1854 | err = scsi_register_driver(&sd_template.gendrv); |
1855 | if (err) | |
1856 | goto err_out_class; | |
1857 | ||
1858 | return 0; | |
1859 | ||
1860 | err_out_class: | |
1861 | class_unregister(&sd_disk_class); | |
1862 | err_out: | |
1863 | for (i = 0; i < SD_MAJORS; i++) | |
1864 | unregister_blkdev(sd_major(i), "sd"); | |
1865 | return err; | |
1da177e4 LT |
1866 | } |
1867 | ||
1868 | /** | |
1869 | * exit_sd - exit point for this driver (when it is a module). | |
1870 | * | |
1871 | * Note: this function unregisters this driver from the scsi mid-level. | |
1872 | **/ | |
1873 | static void __exit exit_sd(void) | |
1874 | { | |
1875 | int i; | |
1876 | ||
1877 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
1878 | ||
1879 | scsi_unregister_driver(&sd_template.gendrv); | |
5e4009ba JG |
1880 | class_unregister(&sd_disk_class); |
1881 | ||
1da177e4 LT |
1882 | for (i = 0; i < SD_MAJORS; i++) |
1883 | unregister_blkdev(sd_major(i), "sd"); | |
1884 | } | |
1885 | ||
1da177e4 LT |
1886 | module_init(init_sd); |
1887 | module_exit(exit_sd); | |
e73aec82 MP |
1888 | |
1889 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, | |
1890 | struct scsi_sense_hdr *sshdr) | |
1891 | { | |
1892 | sd_printk(KERN_INFO, sdkp, ""); | |
1893 | scsi_show_sense_hdr(sshdr); | |
1894 | sd_printk(KERN_INFO, sdkp, ""); | |
1895 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); | |
1896 | } | |
1897 | ||
1898 | static void sd_print_result(struct scsi_disk *sdkp, int result) | |
1899 | { | |
1900 | sd_printk(KERN_INFO, sdkp, ""); | |
1901 | scsi_show_result(result); | |
1902 | } | |
1903 |