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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 | ||
35 | #include <linux/config.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/bio.h> | |
42 | #include <linux/genhd.h> | |
43 | #include <linux/hdreg.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/idr.h> | |
46 | #include <linux/interrupt.h> | |
47 | #include <linux/init.h> | |
48 | #include <linux/blkdev.h> | |
49 | #include <linux/blkpg.h> | |
1da177e4 | 50 | #include <linux/delay.h> |
0b950672 | 51 | #include <linux/mutex.h> |
1da177e4 LT |
52 | #include <asm/uaccess.h> |
53 | ||
54 | #include <scsi/scsi.h> | |
55 | #include <scsi/scsi_cmnd.h> | |
56 | #include <scsi/scsi_dbg.h> | |
57 | #include <scsi/scsi_device.h> | |
58 | #include <scsi/scsi_driver.h> | |
59 | #include <scsi/scsi_eh.h> | |
60 | #include <scsi/scsi_host.h> | |
61 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
62 | #include <scsi/scsicam.h> |
63 | ||
64 | #include "scsi_logging.h" | |
65 | ||
66 | /* | |
67 | * More than enough for everybody ;) The huge number of majors | |
68 | * is a leftover from 16bit dev_t days, we don't really need that | |
69 | * much numberspace. | |
70 | */ | |
71 | #define SD_MAJORS 16 | |
72 | ||
f018fa55 RH |
73 | MODULE_AUTHOR("Eric Youngdale"); |
74 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
75 | MODULE_LICENSE("GPL"); | |
76 | ||
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
85 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
86 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
87 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
88 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
89 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
90 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
91 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
92 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
93 | ||
1da177e4 LT |
94 | /* |
95 | * This is limited by the naming scheme enforced in sd_probe, | |
96 | * add another character to it if you really need more disks. | |
97 | */ | |
98 | #define SD_MAX_DISKS (((26 * 26) + 26 + 1) * 26) | |
99 | ||
100 | /* | |
101 | * Time out in seconds for disks and Magneto-opticals (which are slower). | |
102 | */ | |
103 | #define SD_TIMEOUT (30 * HZ) | |
104 | #define SD_MOD_TIMEOUT (75 * HZ) | |
105 | ||
106 | /* | |
107 | * Number of allowed retries | |
108 | */ | |
109 | #define SD_MAX_RETRIES 5 | |
110 | #define SD_PASSTHROUGH_RETRIES 1 | |
111 | ||
48970800 AV |
112 | /* |
113 | * Size of the initial data buffer for mode and read capacity data | |
114 | */ | |
115 | #define SD_BUF_SIZE 512 | |
116 | ||
1da177e4 LT |
117 | struct scsi_disk { |
118 | struct scsi_driver *driver; /* always &sd_template */ | |
119 | struct scsi_device *device; | |
6bdaa1f1 | 120 | struct class_device cdev; |
1da177e4 LT |
121 | struct gendisk *disk; |
122 | unsigned int openers; /* protected by BKL for now, yuck */ | |
123 | sector_t capacity; /* size in 512-byte sectors */ | |
124 | u32 index; | |
125 | u8 media_present; | |
126 | u8 write_prot; | |
127 | unsigned WCE : 1; /* state of disk WCE bit */ | |
128 | unsigned RCD : 1; /* state of disk RCD bit, unused */ | |
007365ad | 129 | unsigned DPOFUA : 1; /* state of disk DPOFUA bit */ |
1da177e4 | 130 | }; |
6bdaa1f1 | 131 | #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev) |
1da177e4 LT |
132 | |
133 | static DEFINE_IDR(sd_index_idr); | |
134 | static DEFINE_SPINLOCK(sd_index_lock); | |
135 | ||
136 | /* This semaphore is used to mediate the 0->1 reference get in the | |
137 | * face of object destruction (i.e. we can't allow a get on an | |
138 | * object after last put) */ | |
0b950672 | 139 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 LT |
140 | |
141 | static int sd_revalidate_disk(struct gendisk *disk); | |
142 | static void sd_rw_intr(struct scsi_cmnd * SCpnt); | |
143 | ||
144 | static int sd_probe(struct device *); | |
145 | static int sd_remove(struct device *); | |
146 | static void sd_shutdown(struct device *dev); | |
147 | static void sd_rescan(struct device *); | |
148 | static int sd_init_command(struct scsi_cmnd *); | |
149 | static int sd_issue_flush(struct device *, sector_t *); | |
461d4e90 | 150 | static void sd_prepare_flush(request_queue_t *, struct request *); |
1da177e4 | 151 | static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname, |
ea73a9f2 | 152 | unsigned char *buffer); |
6bdaa1f1 JB |
153 | static void scsi_disk_release(struct class_device *cdev); |
154 | ||
155 | static const char *sd_cache_types[] = { | |
156 | "write through", "none", "write back", | |
157 | "write back, no read (daft)" | |
158 | }; | |
159 | ||
160 | static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf, | |
161 | size_t count) | |
162 | { | |
163 | int i, ct = -1, rcd, wce, sp; | |
164 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
165 | struct scsi_device *sdp = sdkp->device; | |
166 | char buffer[64]; | |
167 | char *buffer_data; | |
168 | struct scsi_mode_data data; | |
169 | struct scsi_sense_hdr sshdr; | |
170 | int len; | |
171 | ||
172 | if (sdp->type != TYPE_DISK) | |
173 | /* no cache control on RBC devices; theoretically they | |
174 | * can do it, but there's probably so many exceptions | |
175 | * it's not worth the risk */ | |
176 | return -EINVAL; | |
177 | ||
6391a113 | 178 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
179 | const int len = strlen(sd_cache_types[i]); |
180 | if (strncmp(sd_cache_types[i], buf, len) == 0 && | |
181 | buf[len] == '\n') { | |
182 | ct = i; | |
183 | break; | |
184 | } | |
185 | } | |
186 | if (ct < 0) | |
187 | return -EINVAL; | |
188 | rcd = ct & 0x01 ? 1 : 0; | |
189 | wce = ct & 0x02 ? 1 : 0; | |
190 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
191 | SD_MAX_RETRIES, &data, NULL)) | |
192 | return -EINVAL; | |
a9312fb8 | 193 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
194 | data.block_descriptor_length); |
195 | buffer_data = buffer + data.header_length + | |
196 | data.block_descriptor_length; | |
197 | buffer_data[2] &= ~0x05; | |
198 | buffer_data[2] |= wce << 2 | rcd; | |
199 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
200 | ||
201 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
202 | SD_MAX_RETRIES, &data, &sshdr)) { | |
203 | if (scsi_sense_valid(&sshdr)) | |
204 | scsi_print_sense_hdr(sdkp->disk->disk_name, &sshdr); | |
205 | return -EINVAL; | |
206 | } | |
207 | sd_revalidate_disk(sdkp->disk); | |
208 | return count; | |
209 | } | |
210 | ||
211 | static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf) | |
212 | { | |
213 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
214 | int ct = sdkp->RCD + 2*sdkp->WCE; | |
215 | ||
216 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
217 | } | |
218 | ||
219 | static ssize_t sd_show_fua(struct class_device *cdev, char *buf) | |
220 | { | |
221 | struct scsi_disk *sdkp = to_scsi_disk(cdev); | |
222 | ||
223 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
224 | } | |
225 | ||
226 | static struct class_device_attribute sd_disk_attrs[] = { | |
227 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, | |
228 | sd_store_cache_type), | |
229 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
230 | __ATTR_NULL, | |
231 | }; | |
232 | ||
233 | static struct class sd_disk_class = { | |
234 | .name = "scsi_disk", | |
235 | .owner = THIS_MODULE, | |
236 | .release = scsi_disk_release, | |
237 | .class_dev_attrs = sd_disk_attrs, | |
238 | }; | |
1da177e4 LT |
239 | |
240 | static struct scsi_driver sd_template = { | |
241 | .owner = THIS_MODULE, | |
242 | .gendrv = { | |
243 | .name = "sd", | |
244 | .probe = sd_probe, | |
245 | .remove = sd_remove, | |
246 | .shutdown = sd_shutdown, | |
247 | }, | |
248 | .rescan = sd_rescan, | |
249 | .init_command = sd_init_command, | |
250 | .issue_flush = sd_issue_flush, | |
1da177e4 LT |
251 | }; |
252 | ||
253 | /* | |
254 | * Device no to disk mapping: | |
255 | * | |
256 | * major disc2 disc p1 | |
257 | * |............|.............|....|....| <- dev_t | |
258 | * 31 20 19 8 7 4 3 0 | |
259 | * | |
260 | * Inside a major, we have 16k disks, however mapped non- | |
261 | * contiguously. The first 16 disks are for major0, the next | |
262 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
263 | * for major1, ... | |
264 | * As we stay compatible with our numbering scheme, we can reuse | |
265 | * the well-know SCSI majors 8, 65--71, 136--143. | |
266 | */ | |
267 | static int sd_major(int major_idx) | |
268 | { | |
269 | switch (major_idx) { | |
270 | case 0: | |
271 | return SCSI_DISK0_MAJOR; | |
272 | case 1 ... 7: | |
273 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
274 | case 8 ... 15: | |
275 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
276 | default: | |
277 | BUG(); | |
278 | return 0; /* shut up gcc */ | |
279 | } | |
280 | } | |
281 | ||
1da177e4 LT |
282 | static inline struct scsi_disk *scsi_disk(struct gendisk *disk) |
283 | { | |
284 | return container_of(disk->private_data, struct scsi_disk, driver); | |
285 | } | |
286 | ||
39b7f1e2 | 287 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
288 | { |
289 | struct scsi_disk *sdkp = NULL; | |
290 | ||
39b7f1e2 AS |
291 | if (disk->private_data) { |
292 | sdkp = scsi_disk(disk); | |
293 | if (scsi_device_get(sdkp->device) == 0) | |
6bdaa1f1 | 294 | class_device_get(&sdkp->cdev); |
39b7f1e2 AS |
295 | else |
296 | sdkp = NULL; | |
297 | } | |
298 | return sdkp; | |
299 | } | |
300 | ||
301 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
302 | { | |
303 | struct scsi_disk *sdkp; | |
304 | ||
0b950672 | 305 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 306 | sdkp = __scsi_disk_get(disk); |
0b950672 | 307 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 308 | return sdkp; |
39b7f1e2 | 309 | } |
1da177e4 | 310 | |
39b7f1e2 AS |
311 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
312 | { | |
313 | struct scsi_disk *sdkp; | |
314 | ||
0b950672 | 315 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
316 | sdkp = dev_get_drvdata(dev); |
317 | if (sdkp) | |
318 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 319 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
320 | return sdkp; |
321 | } | |
322 | ||
323 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
324 | { | |
325 | struct scsi_device *sdev = sdkp->device; | |
326 | ||
0b950672 | 327 | mutex_lock(&sd_ref_mutex); |
6bdaa1f1 | 328 | class_device_put(&sdkp->cdev); |
1da177e4 | 329 | scsi_device_put(sdev); |
0b950672 | 330 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
331 | } |
332 | ||
333 | /** | |
334 | * sd_init_command - build a scsi (read or write) command from | |
335 | * information in the request structure. | |
336 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
337 | * contains request and into which the scsi command is written | |
338 | * | |
339 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
340 | **/ | |
341 | static int sd_init_command(struct scsi_cmnd * SCpnt) | |
342 | { | |
1da177e4 LT |
343 | struct scsi_device *sdp = SCpnt->device; |
344 | struct request *rq = SCpnt->request; | |
776b23a0 CH |
345 | struct gendisk *disk = rq->rq_disk; |
346 | sector_t block = rq->sector; | |
347 | unsigned int this_count = SCpnt->request_bufflen >> 9; | |
348 | unsigned int timeout = sdp->timeout; | |
1da177e4 LT |
349 | |
350 | SCSI_LOG_HLQUEUE(1, printk("sd_init_command: disk=%s, block=%llu, " | |
351 | "count=%d\n", disk->disk_name, | |
352 | (unsigned long long)block, this_count)); | |
353 | ||
354 | if (!sdp || !scsi_device_online(sdp) || | |
355 | block + rq->nr_sectors > get_capacity(disk)) { | |
356 | SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", | |
357 | rq->nr_sectors)); | |
358 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | if (sdp->changed) { | |
363 | /* | |
364 | * quietly refuse to do anything to a changed disc until | |
365 | * the changed bit has been reset | |
366 | */ | |
367 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
368 | return 0; | |
369 | } | |
370 | SCSI_LOG_HLQUEUE(2, printk("%s : block=%llu\n", | |
371 | disk->disk_name, (unsigned long long)block)); | |
372 | ||
373 | /* | |
374 | * If we have a 1K hardware sectorsize, prevent access to single | |
375 | * 512 byte sectors. In theory we could handle this - in fact | |
376 | * the scsi cdrom driver must be able to handle this because | |
377 | * we typically use 1K blocksizes, and cdroms typically have | |
378 | * 2K hardware sectorsizes. Of course, things are simpler | |
379 | * with the cdrom, since it is read-only. For performance | |
380 | * reasons, the filesystems should be able to handle this | |
381 | * and not force the scsi disk driver to use bounce buffers | |
382 | * for this. | |
383 | */ | |
384 | if (sdp->sector_size == 1024) { | |
385 | if ((block & 1) || (rq->nr_sectors & 1)) { | |
386 | printk(KERN_ERR "sd: Bad block number requested"); | |
387 | return 0; | |
388 | } else { | |
389 | block = block >> 1; | |
390 | this_count = this_count >> 1; | |
391 | } | |
392 | } | |
393 | if (sdp->sector_size == 2048) { | |
394 | if ((block & 3) || (rq->nr_sectors & 3)) { | |
395 | printk(KERN_ERR "sd: Bad block number requested"); | |
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)) { | |
404 | printk(KERN_ERR "sd: Bad block number requested"); | |
405 | return 0; | |
406 | } else { | |
407 | block = block >> 3; | |
408 | this_count = this_count >> 3; | |
409 | } | |
410 | } | |
411 | if (rq_data_dir(rq) == WRITE) { | |
412 | if (!sdp->writeable) { | |
413 | return 0; | |
414 | } | |
415 | SCpnt->cmnd[0] = WRITE_6; | |
416 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
417 | } else if (rq_data_dir(rq) == READ) { | |
418 | SCpnt->cmnd[0] = READ_6; | |
419 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
420 | } else { | |
421 | printk(KERN_ERR "sd: Unknown command %lx\n", rq->flags); | |
422 | /* overkill panic("Unknown sd command %lx\n", rq->flags); */ | |
423 | return 0; | |
424 | } | |
425 | ||
426 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n", | |
427 | disk->disk_name, (rq_data_dir(rq) == WRITE) ? | |
428 | "writing" : "reading", this_count, rq->nr_sectors)); | |
429 | ||
430 | SCpnt->cmnd[1] = 0; | |
431 | ||
432 | if (block > 0xffffffff) { | |
433 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
007365ad | 434 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
435 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
436 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
437 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
438 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
439 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
440 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
441 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
442 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
443 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
444 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
445 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
446 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
447 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
448 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
449 | SCpnt->device->use_10_for_rw) { | |
450 | if (this_count > 0xffff) | |
451 | this_count = 0xffff; | |
452 | ||
453 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
007365ad | 454 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
455 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
456 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
457 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
458 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
459 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
460 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
461 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
462 | } else { | |
007365ad TH |
463 | if (unlikely(blk_fua_rq(rq))) { |
464 | /* | |
465 | * This happens only if this drive failed | |
466 | * 10byte rw command with ILLEGAL_REQUEST | |
467 | * during operation and thus turned off | |
468 | * use_10_for_rw. | |
469 | */ | |
470 | printk(KERN_ERR "sd: FUA write on READ/WRITE(6) drive\n"); | |
471 | return 0; | |
472 | } | |
473 | ||
1da177e4 LT |
474 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
475 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
476 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
477 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
478 | SCpnt->cmnd[5] = 0; | |
479 | } | |
480 | SCpnt->request_bufflen = SCpnt->bufflen = | |
481 | this_count * sdp->sector_size; | |
482 | ||
483 | /* | |
484 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
485 | * host adapter, it's safe to assume that we can at least transfer | |
486 | * this many bytes between each connect / disconnect. | |
487 | */ | |
488 | SCpnt->transfersize = sdp->sector_size; | |
489 | SCpnt->underflow = this_count << 9; | |
490 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 LT |
491 | SCpnt->timeout_per_command = timeout; |
492 | ||
493 | /* | |
494 | * This is the completion routine we use. This is matched in terms | |
495 | * of capability to this function. | |
496 | */ | |
497 | SCpnt->done = sd_rw_intr; | |
498 | ||
499 | /* | |
500 | * This indicates that the command is ready from our end to be | |
501 | * queued. | |
502 | */ | |
503 | return 1; | |
504 | } | |
505 | ||
506 | /** | |
507 | * sd_open - open a scsi disk device | |
508 | * @inode: only i_rdev member may be used | |
509 | * @filp: only f_mode and f_flags may be used | |
510 | * | |
511 | * Returns 0 if successful. Returns a negated errno value in case | |
512 | * of error. | |
513 | * | |
514 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
515 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
516 | * In the latter case @inode and @filp carry an abridged amount | |
517 | * of information as noted above. | |
518 | **/ | |
519 | static int sd_open(struct inode *inode, struct file *filp) | |
520 | { | |
521 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
522 | struct scsi_disk *sdkp; | |
523 | struct scsi_device *sdev; | |
524 | int retval; | |
525 | ||
526 | if (!(sdkp = scsi_disk_get(disk))) | |
527 | return -ENXIO; | |
528 | ||
529 | ||
530 | SCSI_LOG_HLQUEUE(3, printk("sd_open: disk=%s\n", disk->disk_name)); | |
531 | ||
532 | sdev = sdkp->device; | |
533 | ||
534 | /* | |
535 | * If the device is in error recovery, wait until it is done. | |
536 | * If the device is offline, then disallow any access to it. | |
537 | */ | |
538 | retval = -ENXIO; | |
539 | if (!scsi_block_when_processing_errors(sdev)) | |
540 | goto error_out; | |
541 | ||
542 | if (sdev->removable || sdkp->write_prot) | |
543 | check_disk_change(inode->i_bdev); | |
544 | ||
545 | /* | |
546 | * If the drive is empty, just let the open fail. | |
547 | */ | |
548 | retval = -ENOMEDIUM; | |
549 | if (sdev->removable && !sdkp->media_present && | |
550 | !(filp->f_flags & O_NDELAY)) | |
551 | goto error_out; | |
552 | ||
553 | /* | |
554 | * If the device has the write protect tab set, have the open fail | |
555 | * if the user expects to be able to write to the thing. | |
556 | */ | |
557 | retval = -EROFS; | |
558 | if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) | |
559 | goto error_out; | |
560 | ||
561 | /* | |
562 | * It is possible that the disk changing stuff resulted in | |
563 | * the device being taken offline. If this is the case, | |
564 | * report this to the user, and don't pretend that the | |
565 | * open actually succeeded. | |
566 | */ | |
567 | retval = -ENXIO; | |
568 | if (!scsi_device_online(sdev)) | |
569 | goto error_out; | |
570 | ||
571 | if (!sdkp->openers++ && sdev->removable) { | |
572 | if (scsi_block_when_processing_errors(sdev)) | |
573 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
574 | } | |
575 | ||
576 | return 0; | |
577 | ||
578 | error_out: | |
579 | scsi_disk_put(sdkp); | |
580 | return retval; | |
581 | } | |
582 | ||
583 | /** | |
584 | * sd_release - invoked when the (last) close(2) is called on this | |
585 | * scsi disk. | |
586 | * @inode: only i_rdev member may be used | |
587 | * @filp: only f_mode and f_flags may be used | |
588 | * | |
589 | * Returns 0. | |
590 | * | |
591 | * Note: may block (uninterruptible) if error recovery is underway | |
592 | * on this disk. | |
593 | **/ | |
594 | static int sd_release(struct inode *inode, struct file *filp) | |
595 | { | |
596 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
597 | struct scsi_disk *sdkp = scsi_disk(disk); | |
598 | struct scsi_device *sdev = sdkp->device; | |
599 | ||
600 | SCSI_LOG_HLQUEUE(3, printk("sd_release: disk=%s\n", disk->disk_name)); | |
601 | ||
602 | if (!--sdkp->openers && sdev->removable) { | |
603 | if (scsi_block_when_processing_errors(sdev)) | |
604 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
605 | } | |
606 | ||
607 | /* | |
608 | * XXX and what if there are packets in flight and this close() | |
609 | * XXX is followed by a "rmmod sd_mod"? | |
610 | */ | |
611 | scsi_disk_put(sdkp); | |
612 | return 0; | |
613 | } | |
614 | ||
a885c8c4 | 615 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
616 | { |
617 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
618 | struct scsi_device *sdp = sdkp->device; | |
619 | struct Scsi_Host *host = sdp->host; | |
620 | int diskinfo[4]; | |
621 | ||
622 | /* default to most commonly used values */ | |
623 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
624 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
625 | diskinfo[2] = sdkp->capacity >> 11; | |
626 | ||
627 | /* override with calculated, extended default, or driver values */ | |
628 | if (host->hostt->bios_param) | |
629 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
630 | else | |
631 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
632 | ||
a885c8c4 CH |
633 | geo->heads = diskinfo[0]; |
634 | geo->sectors = diskinfo[1]; | |
635 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
636 | return 0; |
637 | } | |
638 | ||
639 | /** | |
640 | * sd_ioctl - process an ioctl | |
641 | * @inode: only i_rdev/i_bdev members may be used | |
642 | * @filp: only f_mode and f_flags may be used | |
643 | * @cmd: ioctl command number | |
644 | * @arg: this is third argument given to ioctl(2) system call. | |
645 | * Often contains a pointer. | |
646 | * | |
647 | * Returns 0 if successful (some ioctls return postive numbers on | |
648 | * success as well). Returns a negated errno value in case of error. | |
649 | * | |
650 | * Note: most ioctls are forward onto the block subsystem or further | |
651 | * down in the scsi subsytem. | |
652 | **/ | |
653 | static int sd_ioctl(struct inode * inode, struct file * filp, | |
654 | unsigned int cmd, unsigned long arg) | |
655 | { | |
656 | struct block_device *bdev = inode->i_bdev; | |
657 | struct gendisk *disk = bdev->bd_disk; | |
658 | struct scsi_device *sdp = scsi_disk(disk)->device; | |
659 | void __user *p = (void __user *)arg; | |
660 | int error; | |
661 | ||
662 | SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n", | |
663 | disk->disk_name, cmd)); | |
664 | ||
665 | /* | |
666 | * If we are in the middle of error recovery, don't let anyone | |
667 | * else try and use this device. Also, if error recovery fails, it | |
668 | * may try and take the device offline, in which case all further | |
669 | * access to the device is prohibited. | |
670 | */ | |
671 | error = scsi_nonblockable_ioctl(sdp, cmd, p, filp); | |
672 | if (!scsi_block_when_processing_errors(sdp) || !error) | |
673 | return error; | |
674 | ||
1da177e4 LT |
675 | /* |
676 | * Send SCSI addressing ioctls directly to mid level, send other | |
677 | * ioctls to block level and then onto mid level if they can't be | |
678 | * resolved. | |
679 | */ | |
680 | switch (cmd) { | |
681 | case SCSI_IOCTL_GET_IDLUN: | |
682 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
683 | return scsi_ioctl(sdp, cmd, p); | |
684 | default: | |
685 | error = scsi_cmd_ioctl(filp, disk, cmd, p); | |
686 | if (error != -ENOTTY) | |
687 | return error; | |
688 | } | |
689 | return scsi_ioctl(sdp, cmd, p); | |
690 | } | |
691 | ||
692 | static void set_media_not_present(struct scsi_disk *sdkp) | |
693 | { | |
694 | sdkp->media_present = 0; | |
695 | sdkp->capacity = 0; | |
696 | sdkp->device->changed = 1; | |
697 | } | |
698 | ||
699 | /** | |
700 | * sd_media_changed - check if our medium changed | |
701 | * @disk: kernel device descriptor | |
702 | * | |
703 | * Returns 0 if not applicable or no change; 1 if change | |
704 | * | |
705 | * Note: this function is invoked from the block subsystem. | |
706 | **/ | |
707 | static int sd_media_changed(struct gendisk *disk) | |
708 | { | |
709 | struct scsi_disk *sdkp = scsi_disk(disk); | |
710 | struct scsi_device *sdp = sdkp->device; | |
711 | int retval; | |
712 | ||
713 | SCSI_LOG_HLQUEUE(3, printk("sd_media_changed: disk=%s\n", | |
714 | disk->disk_name)); | |
715 | ||
716 | if (!sdp->removable) | |
717 | return 0; | |
718 | ||
719 | /* | |
720 | * If the device is offline, don't send any commands - just pretend as | |
721 | * if the command failed. If the device ever comes back online, we | |
722 | * can deal with it then. It is only because of unrecoverable errors | |
723 | * that we would ever take a device offline in the first place. | |
724 | */ | |
725 | if (!scsi_device_online(sdp)) | |
726 | goto not_present; | |
727 | ||
728 | /* | |
729 | * Using TEST_UNIT_READY enables differentiation between drive with | |
730 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
731 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
732 | * | |
733 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
734 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
735 | * sd_revalidate() is called. | |
736 | */ | |
737 | retval = -ENODEV; | |
738 | if (scsi_block_when_processing_errors(sdp)) | |
739 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES); | |
740 | ||
741 | /* | |
742 | * Unable to test, unit probably not ready. This usually | |
743 | * means there is no disc in the drive. Mark as changed, | |
744 | * and we will figure it out later once the drive is | |
745 | * available again. | |
746 | */ | |
747 | if (retval) | |
748 | goto not_present; | |
749 | ||
750 | /* | |
751 | * For removable scsi disk we have to recognise the presence | |
752 | * of a disk in the drive. This is kept in the struct scsi_disk | |
753 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
754 | */ | |
755 | sdkp->media_present = 1; | |
756 | ||
757 | retval = sdp->changed; | |
758 | sdp->changed = 0; | |
759 | ||
760 | return retval; | |
761 | ||
762 | not_present: | |
763 | set_media_not_present(sdkp); | |
764 | return 1; | |
765 | } | |
766 | ||
767 | static int sd_sync_cache(struct scsi_device *sdp) | |
768 | { | |
1da177e4 | 769 | int retries, res; |
ea73a9f2 | 770 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
771 | |
772 | if (!scsi_device_online(sdp)) | |
773 | return -ENODEV; | |
774 | ||
1da177e4 | 775 | |
1da177e4 LT |
776 | for (retries = 3; retries > 0; --retries) { |
777 | unsigned char cmd[10] = { 0 }; | |
778 | ||
779 | cmd[0] = SYNCHRONIZE_CACHE; | |
780 | /* | |
781 | * Leave the rest of the command zero to indicate | |
782 | * flush everything. | |
783 | */ | |
ea73a9f2 JB |
784 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
785 | SD_TIMEOUT, SD_MAX_RETRIES); | |
786 | if (res == 0) | |
1da177e4 LT |
787 | break; |
788 | } | |
789 | ||
ea73a9f2 | 790 | if (res) { printk(KERN_WARNING "FAILED\n status = %x, message = %02x, " |
1da177e4 LT |
791 | "host = %d, driver = %02x\n ", |
792 | status_byte(res), msg_byte(res), | |
793 | host_byte(res), driver_byte(res)); | |
794 | if (driver_byte(res) & DRIVER_SENSE) | |
ea73a9f2 | 795 | scsi_print_sense_hdr("sd", &sshdr); |
1da177e4 LT |
796 | } |
797 | ||
1da177e4 LT |
798 | return res; |
799 | } | |
800 | ||
801 | static int sd_issue_flush(struct device *dev, sector_t *error_sector) | |
802 | { | |
39b7f1e2 | 803 | int ret = 0; |
1da177e4 | 804 | struct scsi_device *sdp = to_scsi_device(dev); |
39b7f1e2 | 805 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
806 | |
807 | if (!sdkp) | |
808 | return -ENODEV; | |
809 | ||
39b7f1e2 AS |
810 | if (sdkp->WCE) |
811 | ret = sd_sync_cache(sdp); | |
812 | scsi_disk_put(sdkp); | |
813 | return ret; | |
1da177e4 LT |
814 | } |
815 | ||
461d4e90 | 816 | static void sd_prepare_flush(request_queue_t *q, struct request *rq) |
1da177e4 | 817 | { |
c0ed79a3 | 818 | memset(rq->cmd, 0, sizeof(rq->cmd)); |
461d4e90 | 819 | rq->flags |= REQ_BLOCK_PC; |
c0ed79a3 JB |
820 | rq->timeout = SD_TIMEOUT; |
821 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
461d4e90 | 822 | rq->cmd_len = 10; |
1da177e4 LT |
823 | } |
824 | ||
825 | static void sd_rescan(struct device *dev) | |
826 | { | |
39b7f1e2 AS |
827 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
828 | ||
829 | if (sdkp) { | |
830 | sd_revalidate_disk(sdkp->disk); | |
831 | scsi_disk_put(sdkp); | |
832 | } | |
1da177e4 LT |
833 | } |
834 | ||
835 | ||
836 | #ifdef CONFIG_COMPAT | |
837 | /* | |
838 | * This gets directly called from VFS. When the ioctl | |
839 | * is not recognized we go back to the other translation paths. | |
840 | */ | |
841 | static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
842 | { | |
843 | struct block_device *bdev = file->f_dentry->d_inode->i_bdev; | |
844 | struct gendisk *disk = bdev->bd_disk; | |
845 | struct scsi_device *sdev = scsi_disk(disk)->device; | |
846 | ||
847 | /* | |
848 | * If we are in the middle of error recovery, don't let anyone | |
849 | * else try and use this device. Also, if error recovery fails, it | |
850 | * may try and take the device offline, in which case all further | |
851 | * access to the device is prohibited. | |
852 | */ | |
853 | if (!scsi_block_when_processing_errors(sdev)) | |
854 | return -ENODEV; | |
855 | ||
856 | if (sdev->host->hostt->compat_ioctl) { | |
857 | int ret; | |
858 | ||
859 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg); | |
860 | ||
861 | return ret; | |
862 | } | |
863 | ||
864 | /* | |
865 | * Let the static ioctl translation table take care of it. | |
866 | */ | |
867 | return -ENOIOCTLCMD; | |
868 | } | |
869 | #endif | |
870 | ||
871 | static struct block_device_operations sd_fops = { | |
872 | .owner = THIS_MODULE, | |
873 | .open = sd_open, | |
874 | .release = sd_release, | |
875 | .ioctl = sd_ioctl, | |
a885c8c4 | 876 | .getgeo = sd_getgeo, |
1da177e4 LT |
877 | #ifdef CONFIG_COMPAT |
878 | .compat_ioctl = sd_compat_ioctl, | |
879 | #endif | |
880 | .media_changed = sd_media_changed, | |
881 | .revalidate_disk = sd_revalidate_disk, | |
882 | }; | |
883 | ||
884 | /** | |
885 | * sd_rw_intr - bottom half handler: called when the lower level | |
886 | * driver has completed (successfully or otherwise) a scsi command. | |
887 | * @SCpnt: mid-level's per command structure. | |
888 | * | |
889 | * Note: potentially run from within an ISR. Must not block. | |
890 | **/ | |
891 | static void sd_rw_intr(struct scsi_cmnd * SCpnt) | |
892 | { | |
893 | int result = SCpnt->result; | |
03aba2f7 LT |
894 | unsigned int xfer_size = SCpnt->request_bufflen; |
895 | unsigned int good_bytes = result ? 0 : xfer_size; | |
896 | u64 start_lba = SCpnt->request->sector; | |
897 | u64 bad_lba; | |
1da177e4 LT |
898 | struct scsi_sense_hdr sshdr; |
899 | int sense_valid = 0; | |
900 | int sense_deferred = 0; | |
901 | int info_valid; | |
902 | ||
903 | if (result) { | |
904 | sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); | |
905 | if (sense_valid) | |
906 | sense_deferred = scsi_sense_is_deferred(&sshdr); | |
907 | } | |
1da177e4 LT |
908 | #ifdef CONFIG_SCSI_LOGGING |
909 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: %s: res=0x%x\n", | |
910 | SCpnt->request->rq_disk->disk_name, result)); | |
911 | if (sense_valid) { | |
912 | SCSI_LOG_HLCOMPLETE(1, printk("sd_rw_intr: sb[respc,sk,asc," | |
913 | "ascq]=%x,%x,%x,%x\n", sshdr.response_code, | |
914 | sshdr.sense_key, sshdr.asc, sshdr.ascq)); | |
915 | } | |
916 | #endif | |
03aba2f7 LT |
917 | if (driver_byte(result) != DRIVER_SENSE && |
918 | (!sense_valid || sense_deferred)) | |
919 | goto out; | |
920 | ||
921 | switch (sshdr.sense_key) { | |
922 | case HARDWARE_ERROR: | |
923 | case MEDIUM_ERROR: | |
924 | if (!blk_fs_request(SCpnt->request)) | |
925 | goto out; | |
926 | info_valid = scsi_get_sense_info_fld(SCpnt->sense_buffer, | |
927 | SCSI_SENSE_BUFFERSIZE, | |
928 | &bad_lba); | |
929 | if (!info_valid) | |
930 | goto out; | |
931 | if (xfer_size <= SCpnt->device->sector_size) | |
932 | goto out; | |
933 | switch (SCpnt->device->sector_size) { | |
934 | case 256: | |
935 | start_lba <<= 1; | |
1da177e4 | 936 | break; |
03aba2f7 | 937 | case 512: |
1da177e4 | 938 | break; |
03aba2f7 LT |
939 | case 1024: |
940 | start_lba >>= 1; | |
941 | break; | |
942 | case 2048: | |
943 | start_lba >>= 2; | |
944 | break; | |
945 | case 4096: | |
946 | start_lba >>= 3; | |
1da177e4 | 947 | break; |
1da177e4 | 948 | default: |
03aba2f7 LT |
949 | /* Print something here with limiting frequency. */ |
950 | goto out; | |
1da177e4 LT |
951 | break; |
952 | } | |
03aba2f7 LT |
953 | /* This computation should always be done in terms of |
954 | * the resolution of the device's medium. | |
955 | */ | |
956 | good_bytes = (bad_lba - start_lba)*SCpnt->device->sector_size; | |
957 | break; | |
958 | case RECOVERED_ERROR: | |
959 | case NO_SENSE: | |
960 | /* Inform the user, but make sure that it's not treated | |
961 | * as a hard error. | |
962 | */ | |
963 | scsi_print_sense("sd", SCpnt); | |
964 | SCpnt->result = 0; | |
965 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
966 | good_bytes = xfer_size; | |
967 | break; | |
968 | case ILLEGAL_REQUEST: | |
969 | if (SCpnt->device->use_10_for_rw && | |
970 | (SCpnt->cmnd[0] == READ_10 || | |
971 | SCpnt->cmnd[0] == WRITE_10)) | |
972 | SCpnt->device->use_10_for_rw = 0; | |
973 | if (SCpnt->device->use_10_for_ms && | |
974 | (SCpnt->cmnd[0] == MODE_SENSE_10 || | |
975 | SCpnt->cmnd[0] == MODE_SELECT_10)) | |
976 | SCpnt->device->use_10_for_ms = 0; | |
977 | break; | |
978 | default: | |
979 | break; | |
1da177e4 | 980 | } |
03aba2f7 LT |
981 | out: |
982 | scsi_io_completion(SCpnt, good_bytes); | |
1da177e4 LT |
983 | } |
984 | ||
ea73a9f2 JB |
985 | static int media_not_present(struct scsi_disk *sdkp, |
986 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 987 | { |
1da177e4 | 988 | |
ea73a9f2 | 989 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
990 | return 0; |
991 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
992 | if (sshdr->sense_key != NOT_READY && |
993 | sshdr->sense_key != UNIT_ATTENTION) | |
994 | return 0; | |
995 | if (sshdr->asc != 0x3A) /* medium not present */ | |
996 | return 0; | |
997 | ||
1da177e4 LT |
998 | set_media_not_present(sdkp); |
999 | return 1; | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * spinup disk - called only in sd_revalidate_disk() | |
1004 | */ | |
1005 | static void | |
ea73a9f2 JB |
1006 | sd_spinup_disk(struct scsi_disk *sdkp, char *diskname) |
1007 | { | |
1da177e4 | 1008 | unsigned char cmd[10]; |
4451e472 | 1009 | unsigned long spintime_expire = 0; |
1da177e4 LT |
1010 | int retries, spintime; |
1011 | unsigned int the_result; | |
1012 | struct scsi_sense_hdr sshdr; | |
1013 | int sense_valid = 0; | |
1014 | ||
1015 | spintime = 0; | |
1016 | ||
1017 | /* Spin up drives, as required. Only do this at boot time */ | |
1018 | /* Spinup needs to be done for module loads too. */ | |
1019 | do { | |
1020 | retries = 0; | |
1021 | ||
1022 | do { | |
1023 | cmd[0] = TEST_UNIT_READY; | |
1024 | memset((void *) &cmd[1], 0, 9); | |
1025 | ||
ea73a9f2 JB |
1026 | the_result = scsi_execute_req(sdkp->device, cmd, |
1027 | DMA_NONE, NULL, 0, | |
1028 | &sshdr, SD_TIMEOUT, | |
1029 | SD_MAX_RETRIES); | |
1da177e4 | 1030 | |
1da177e4 | 1031 | if (the_result) |
ea73a9f2 | 1032 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1033 | retries++; |
1034 | } while (retries < 3 && | |
1035 | (!scsi_status_is_good(the_result) || | |
1036 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1037 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1038 | ||
1039 | /* | |
1040 | * If the drive has indicated to us that it doesn't have | |
1041 | * any media in it, don't bother with any of the rest of | |
1042 | * this crap. | |
1043 | */ | |
ea73a9f2 | 1044 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1045 | return; |
1046 | ||
1047 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { | |
1048 | /* no sense, TUR either succeeded or failed | |
1049 | * with a status error */ | |
1050 | if(!spintime && !scsi_status_is_good(the_result)) | |
1051 | printk(KERN_NOTICE "%s: Unit Not Ready, " | |
1052 | "error = 0x%x\n", diskname, the_result); | |
1053 | break; | |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * The device does not want the automatic start to be issued. | |
1058 | */ | |
1059 | if (sdkp->device->no_start_on_add) { | |
1060 | break; | |
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * If manual intervention is required, or this is an | |
1065 | * absent USB storage device, a spinup is meaningless. | |
1066 | */ | |
1067 | if (sense_valid && | |
1068 | sshdr.sense_key == NOT_READY && | |
1069 | sshdr.asc == 4 && sshdr.ascq == 3) { | |
1070 | break; /* manual intervention required */ | |
1071 | ||
1072 | /* | |
1073 | * Issue command to spin up drive when not ready | |
1074 | */ | |
1075 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { | |
1076 | if (!spintime) { | |
1077 | printk(KERN_NOTICE "%s: Spinning up disk...", | |
1078 | diskname); | |
1079 | cmd[0] = START_STOP; | |
1080 | cmd[1] = 1; /* Return immediately */ | |
1081 | memset((void *) &cmd[2], 0, 8); | |
1082 | cmd[4] = 1; /* Start spin cycle */ | |
ea73a9f2 JB |
1083 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1084 | NULL, 0, &sshdr, | |
1085 | SD_TIMEOUT, SD_MAX_RETRIES); | |
4451e472 AS |
1086 | spintime_expire = jiffies + 100 * HZ; |
1087 | spintime = 1; | |
1da177e4 | 1088 | } |
1da177e4 LT |
1089 | /* Wait 1 second for next try */ |
1090 | msleep(1000); | |
1091 | printk("."); | |
4451e472 AS |
1092 | |
1093 | /* | |
1094 | * Wait for USB flash devices with slow firmware. | |
1095 | * Yes, this sense key/ASC combination shouldn't | |
1096 | * occur here. It's characteristic of these devices. | |
1097 | */ | |
1098 | } else if (sense_valid && | |
1099 | sshdr.sense_key == UNIT_ATTENTION && | |
1100 | sshdr.asc == 0x28) { | |
1101 | if (!spintime) { | |
1102 | spintime_expire = jiffies + 5 * HZ; | |
1103 | spintime = 1; | |
1104 | } | |
1105 | /* Wait 1 second for next try */ | |
1106 | msleep(1000); | |
1da177e4 LT |
1107 | } else { |
1108 | /* we don't understand the sense code, so it's | |
1109 | * probably pointless to loop */ | |
1110 | if(!spintime) { | |
1111 | printk(KERN_NOTICE "%s: Unit Not Ready, " | |
1112 | "sense:\n", diskname); | |
ea73a9f2 | 1113 | scsi_print_sense_hdr("", &sshdr); |
1da177e4 LT |
1114 | } |
1115 | break; | |
1116 | } | |
1117 | ||
4451e472 | 1118 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1119 | |
1120 | if (spintime) { | |
1121 | if (scsi_status_is_good(the_result)) | |
1122 | printk("ready\n"); | |
1123 | else | |
1124 | printk("not responding...\n"); | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * read disk capacity | |
1130 | */ | |
1131 | static void | |
1132 | sd_read_capacity(struct scsi_disk *sdkp, char *diskname, | |
ea73a9f2 JB |
1133 | unsigned char *buffer) |
1134 | { | |
1da177e4 | 1135 | unsigned char cmd[16]; |
1da177e4 LT |
1136 | int the_result, retries; |
1137 | int sector_size = 0; | |
1138 | int longrc = 0; | |
1139 | struct scsi_sense_hdr sshdr; | |
1140 | int sense_valid = 0; | |
ea73a9f2 | 1141 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1142 | |
1143 | repeat: | |
1144 | retries = 3; | |
1145 | do { | |
1146 | if (longrc) { | |
1147 | memset((void *) cmd, 0, 16); | |
1148 | cmd[0] = SERVICE_ACTION_IN; | |
1149 | cmd[1] = SAI_READ_CAPACITY_16; | |
1150 | cmd[13] = 12; | |
1151 | memset((void *) buffer, 0, 12); | |
1152 | } else { | |
1153 | cmd[0] = READ_CAPACITY; | |
1154 | memset((void *) &cmd[1], 0, 9); | |
1155 | memset((void *) buffer, 0, 8); | |
1156 | } | |
1157 | ||
ea73a9f2 JB |
1158 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
1159 | buffer, longrc ? 12 : 8, &sshdr, | |
1160 | SD_TIMEOUT, SD_MAX_RETRIES); | |
1da177e4 | 1161 | |
ea73a9f2 | 1162 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1163 | return; |
1164 | ||
1da177e4 | 1165 | if (the_result) |
ea73a9f2 | 1166 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1167 | retries--; |
1168 | ||
1169 | } while (the_result && retries); | |
1170 | ||
1171 | if (the_result && !longrc) { | |
1172 | printk(KERN_NOTICE "%s : READ CAPACITY failed.\n" | |
1173 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", | |
1174 | diskname, diskname, | |
1175 | status_byte(the_result), | |
1176 | msg_byte(the_result), | |
1177 | host_byte(the_result), | |
1178 | driver_byte(the_result)); | |
1179 | ||
1180 | if (driver_byte(the_result) & DRIVER_SENSE) | |
ea73a9f2 | 1181 | scsi_print_sense_hdr("sd", &sshdr); |
1da177e4 LT |
1182 | else |
1183 | printk("%s : sense not available. \n", diskname); | |
1184 | ||
1185 | /* Set dirty bit for removable devices if not ready - | |
1186 | * sometimes drives will not report this properly. */ | |
1187 | if (sdp->removable && | |
1188 | sense_valid && sshdr.sense_key == NOT_READY) | |
1189 | sdp->changed = 1; | |
1190 | ||
1191 | /* Either no media are present but the drive didn't tell us, | |
1192 | or they are present but the read capacity command fails */ | |
1193 | /* sdkp->media_present = 0; -- not always correct */ | |
1194 | sdkp->capacity = 0x200000; /* 1 GB - random */ | |
1195 | ||
1196 | return; | |
1197 | } else if (the_result && longrc) { | |
1198 | /* READ CAPACITY(16) has been failed */ | |
1199 | printk(KERN_NOTICE "%s : READ CAPACITY(16) failed.\n" | |
1200 | "%s : status=%x, message=%02x, host=%d, driver=%02x \n", | |
1201 | diskname, diskname, | |
1202 | status_byte(the_result), | |
1203 | msg_byte(the_result), | |
1204 | host_byte(the_result), | |
1205 | driver_byte(the_result)); | |
1206 | printk(KERN_NOTICE "%s : use 0xffffffff as device size\n", | |
1207 | diskname); | |
1208 | ||
1209 | sdkp->capacity = 1 + (sector_t) 0xffffffff; | |
1210 | goto got_data; | |
1211 | } | |
1212 | ||
1213 | if (!longrc) { | |
1214 | sector_size = (buffer[4] << 24) | | |
1215 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
1216 | if (buffer[0] == 0xff && buffer[1] == 0xff && | |
1217 | buffer[2] == 0xff && buffer[3] == 0xff) { | |
1218 | if(sizeof(sdkp->capacity) > 4) { | |
1219 | printk(KERN_NOTICE "%s : very big device. try to use" | |
1220 | " READ CAPACITY(16).\n", diskname); | |
1221 | longrc = 1; | |
1222 | goto repeat; | |
1223 | } | |
1224 | printk(KERN_ERR "%s: too big for this kernel. Use a " | |
1225 | "kernel compiled with support for large block " | |
1226 | "devices.\n", diskname); | |
1227 | sdkp->capacity = 0; | |
1228 | goto got_data; | |
1229 | } | |
1230 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | | |
1231 | (buffer[1] << 16) | | |
1232 | (buffer[2] << 8) | | |
1233 | buffer[3]); | |
1234 | } else { | |
1235 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | | |
1236 | ((u64)buffer[1] << 48) | | |
1237 | ((u64)buffer[2] << 40) | | |
1238 | ((u64)buffer[3] << 32) | | |
1239 | ((sector_t)buffer[4] << 24) | | |
1240 | ((sector_t)buffer[5] << 16) | | |
1241 | ((sector_t)buffer[6] << 8) | | |
1242 | (sector_t)buffer[7]); | |
1243 | ||
1244 | sector_size = (buffer[8] << 24) | | |
1245 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; | |
1246 | } | |
1247 | ||
1248 | /* Some devices return the total number of sectors, not the | |
1249 | * highest sector number. Make the necessary adjustment. */ | |
1250 | if (sdp->fix_capacity) | |
1251 | --sdkp->capacity; | |
1252 | ||
1253 | got_data: | |
1254 | if (sector_size == 0) { | |
1255 | sector_size = 512; | |
1256 | printk(KERN_NOTICE "%s : sector size 0 reported, " | |
1257 | "assuming 512.\n", diskname); | |
1258 | } | |
1259 | ||
1260 | if (sector_size != 512 && | |
1261 | sector_size != 1024 && | |
1262 | sector_size != 2048 && | |
1263 | sector_size != 4096 && | |
1264 | sector_size != 256) { | |
1265 | printk(KERN_NOTICE "%s : unsupported sector size " | |
1266 | "%d.\n", diskname, sector_size); | |
1267 | /* | |
1268 | * The user might want to re-format the drive with | |
1269 | * a supported sectorsize. Once this happens, it | |
1270 | * would be relatively trivial to set the thing up. | |
1271 | * For this reason, we leave the thing in the table. | |
1272 | */ | |
1273 | sdkp->capacity = 0; | |
1274 | /* | |
1275 | * set a bogus sector size so the normal read/write | |
1276 | * logic in the block layer will eventually refuse any | |
1277 | * request on this device without tripping over power | |
1278 | * of two sector size assumptions | |
1279 | */ | |
1280 | sector_size = 512; | |
1281 | } | |
1282 | { | |
1283 | /* | |
1284 | * The msdos fs needs to know the hardware sector size | |
1285 | * So I have created this table. See ll_rw_blk.c | |
1286 | * Jacques Gelinas (Jacques@solucorp.qc.ca) | |
1287 | */ | |
1288 | int hard_sector = sector_size; | |
7a691bd3 | 1289 | sector_t sz = (sdkp->capacity/2) * (hard_sector/256); |
1da177e4 | 1290 | request_queue_t *queue = sdp->request_queue; |
7a691bd3 | 1291 | sector_t mb = sz; |
1da177e4 LT |
1292 | |
1293 | blk_queue_hardsect_size(queue, hard_sector); | |
1294 | /* avoid 64-bit division on 32-bit platforms */ | |
7a691bd3 | 1295 | sector_div(sz, 625); |
1da177e4 LT |
1296 | mb -= sz - 974; |
1297 | sector_div(mb, 1950); | |
1298 | ||
1299 | printk(KERN_NOTICE "SCSI device %s: " | |
1300 | "%llu %d-byte hdwr sectors (%llu MB)\n", | |
1301 | diskname, (unsigned long long)sdkp->capacity, | |
1302 | hard_sector, (unsigned long long)mb); | |
1303 | } | |
1304 | ||
1305 | /* Rescale capacity to 512-byte units */ | |
1306 | if (sector_size == 4096) | |
1307 | sdkp->capacity <<= 3; | |
1308 | else if (sector_size == 2048) | |
1309 | sdkp->capacity <<= 2; | |
1310 | else if (sector_size == 1024) | |
1311 | sdkp->capacity <<= 1; | |
1312 | else if (sector_size == 256) | |
1313 | sdkp->capacity >>= 1; | |
1314 | ||
1315 | sdkp->device->sector_size = sector_size; | |
1316 | } | |
1317 | ||
1318 | /* called with buffer of length 512 */ | |
1319 | static inline int | |
ea73a9f2 JB |
1320 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1321 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1322 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1323 | { |
ea73a9f2 | 1324 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1325 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1326 | sshdr); |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | /* | |
1330 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1331 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1332 | */ |
1333 | static void | |
1334 | sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname, | |
ea73a9f2 JB |
1335 | unsigned char *buffer) |
1336 | { | |
1da177e4 | 1337 | int res; |
ea73a9f2 | 1338 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1339 | struct scsi_mode_data data; |
1340 | ||
1341 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1342 | if (sdp->skip_ms_page_3f) { |
1da177e4 LT |
1343 | printk(KERN_NOTICE "%s: assuming Write Enabled\n", diskname); |
1344 | return; | |
1345 | } | |
1346 | ||
ea73a9f2 JB |
1347 | if (sdp->use_192_bytes_for_3f) { |
1348 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1349 | } else { |
1350 | /* | |
1351 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1352 | * We have to start carefully: some devices hang if we ask | |
1353 | * for more than is available. | |
1354 | */ | |
ea73a9f2 | 1355 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1356 | |
1357 | /* | |
1358 | * Second attempt: ask for page 0 When only page 0 is | |
1359 | * implemented, a request for page 3F may return Sense Key | |
1360 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1361 | * CDB. | |
1362 | */ | |
1363 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1364 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1365 | |
1366 | /* | |
1367 | * Third attempt: ask 255 bytes, as we did earlier. | |
1368 | */ | |
1369 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1370 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1371 | &data, NULL); | |
1da177e4 LT |
1372 | } |
1373 | ||
1374 | if (!scsi_status_is_good(res)) { | |
1375 | printk(KERN_WARNING | |
1376 | "%s: test WP failed, assume Write Enabled\n", diskname); | |
1377 | } else { | |
1378 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1379 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
1380 | printk(KERN_NOTICE "%s: Write Protect is %s\n", diskname, | |
1381 | sdkp->write_prot ? "on" : "off"); | |
1382 | printk(KERN_DEBUG "%s: Mode Sense: %02x %02x %02x %02x\n", | |
1383 | diskname, buffer[0], buffer[1], buffer[2], buffer[3]); | |
1384 | } | |
1385 | } | |
1386 | ||
1387 | /* | |
1388 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1389 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1390 | */ |
1391 | static void | |
1392 | sd_read_cache_type(struct scsi_disk *sdkp, char *diskname, | |
ea73a9f2 | 1393 | unsigned char *buffer) |
631e8a13 | 1394 | { |
1da177e4 | 1395 | int len = 0, res; |
ea73a9f2 | 1396 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1397 | |
631e8a13 AV |
1398 | int dbd; |
1399 | int modepage; | |
1da177e4 LT |
1400 | struct scsi_mode_data data; |
1401 | struct scsi_sense_hdr sshdr; | |
1402 | ||
ea73a9f2 | 1403 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1404 | goto defaults; |
1405 | ||
ea73a9f2 | 1406 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1407 | modepage = 6; |
1408 | dbd = 8; | |
1409 | } else { | |
1410 | modepage = 8; | |
1411 | dbd = 0; | |
1412 | } | |
1413 | ||
1da177e4 | 1414 | /* cautiously ask */ |
ea73a9f2 | 1415 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1416 | |
1417 | if (!scsi_status_is_good(res)) | |
1418 | goto bad_sense; | |
1419 | ||
6d73c851 AV |
1420 | if (!data.header_length) { |
1421 | modepage = 6; | |
1422 | printk(KERN_ERR "%s: missing header in MODE_SENSE response\n", | |
1423 | diskname); | |
1424 | } | |
1425 | ||
1da177e4 LT |
1426 | /* that went OK, now ask for the proper length */ |
1427 | len = data.length; | |
1428 | ||
1429 | /* | |
1430 | * We're only interested in the first three bytes, actually. | |
1431 | * But the data cache page is defined for the first 20. | |
1432 | */ | |
1433 | if (len < 3) | |
1434 | goto bad_sense; | |
1435 | if (len > 20) | |
1436 | len = 20; | |
1437 | ||
1438 | /* Take headers and block descriptors into account */ | |
1439 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1440 | if (len > SD_BUF_SIZE) |
1441 | goto bad_sense; | |
1da177e4 LT |
1442 | |
1443 | /* Get the data */ | |
ea73a9f2 | 1444 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1445 | |
1446 | if (scsi_status_is_good(res)) { | |
1da177e4 | 1447 | int ct = 0; |
631e8a13 | 1448 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1449 | |
48970800 AV |
1450 | if (offset >= SD_BUF_SIZE - 2) { |
1451 | printk(KERN_ERR "%s: malformed MODE SENSE response", | |
1452 | diskname); | |
1453 | goto defaults; | |
1454 | } | |
1455 | ||
631e8a13 AV |
1456 | if ((buffer[offset] & 0x3f) != modepage) { |
1457 | printk(KERN_ERR "%s: got wrong page\n", diskname); | |
1458 | goto defaults; | |
1459 | } | |
1460 | ||
1461 | if (modepage == 8) { | |
1462 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1463 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1464 | } else { | |
1465 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1466 | sdkp->RCD = 0; | |
1467 | } | |
1da177e4 | 1468 | |
007365ad TH |
1469 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1470 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
1471 | printk(KERN_NOTICE "SCSI device %s: uses " | |
1472 | "READ/WRITE(6), disabling FUA\n", diskname); | |
1473 | sdkp->DPOFUA = 0; | |
1474 | } | |
1475 | ||
1da177e4 LT |
1476 | ct = sdkp->RCD + 2*sdkp->WCE; |
1477 | ||
007365ad | 1478 | printk(KERN_NOTICE "SCSI device %s: drive cache: %s%s\n", |
6bdaa1f1 | 1479 | diskname, sd_cache_types[ct], |
007365ad | 1480 | sdkp->DPOFUA ? " w/ FUA" : ""); |
1da177e4 LT |
1481 | |
1482 | return; | |
1483 | } | |
1484 | ||
1485 | bad_sense: | |
ea73a9f2 | 1486 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1487 | sshdr.sense_key == ILLEGAL_REQUEST && |
1488 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
1489 | printk(KERN_NOTICE "%s: cache data unavailable\n", | |
1490 | diskname); /* Invalid field in CDB */ | |
1491 | else | |
1492 | printk(KERN_ERR "%s: asking for cache data failed\n", | |
1493 | diskname); | |
1494 | ||
1495 | defaults: | |
1496 | printk(KERN_ERR "%s: assuming drive cache: write through\n", | |
1497 | diskname); | |
1498 | sdkp->WCE = 0; | |
1499 | sdkp->RCD = 0; | |
48970800 | 1500 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1501 | } |
1502 | ||
1503 | /** | |
1504 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1505 | * performs disk spin up, read_capacity, etc. | |
1506 | * @disk: struct gendisk we care about | |
1507 | **/ | |
1508 | static int sd_revalidate_disk(struct gendisk *disk) | |
1509 | { | |
1510 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1511 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 1512 | unsigned char *buffer; |
461d4e90 | 1513 | unsigned ordered; |
1da177e4 LT |
1514 | |
1515 | SCSI_LOG_HLQUEUE(3, printk("sd_revalidate_disk: disk=%s\n", disk->disk_name)); | |
1516 | ||
1517 | /* | |
1518 | * If the device is offline, don't try and read capacity or any | |
1519 | * of the other niceties. | |
1520 | */ | |
1521 | if (!scsi_device_online(sdp)) | |
1522 | goto out; | |
1523 | ||
48970800 | 1524 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA); |
1da177e4 LT |
1525 | if (!buffer) { |
1526 | printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation " | |
1527 | "failure.\n"); | |
ea73a9f2 | 1528 | goto out; |
1da177e4 LT |
1529 | } |
1530 | ||
1531 | /* defaults, until the device tells us otherwise */ | |
1532 | sdp->sector_size = 512; | |
1533 | sdkp->capacity = 0; | |
1534 | sdkp->media_present = 1; | |
1535 | sdkp->write_prot = 0; | |
1536 | sdkp->WCE = 0; | |
1537 | sdkp->RCD = 0; | |
1538 | ||
ea73a9f2 | 1539 | sd_spinup_disk(sdkp, disk->disk_name); |
1da177e4 LT |
1540 | |
1541 | /* | |
1542 | * Without media there is no reason to ask; moreover, some devices | |
1543 | * react badly if we do. | |
1544 | */ | |
1545 | if (sdkp->media_present) { | |
ea73a9f2 | 1546 | sd_read_capacity(sdkp, disk->disk_name, buffer); |
38d76df2 | 1547 | sd_read_write_protect_flag(sdkp, disk->disk_name, buffer); |
ea73a9f2 | 1548 | sd_read_cache_type(sdkp, disk->disk_name, buffer); |
1da177e4 | 1549 | } |
461d4e90 TH |
1550 | |
1551 | /* | |
1552 | * We now have all cache related info, determine how we deal | |
1553 | * with ordered requests. Note that as the current SCSI | |
1554 | * dispatch function can alter request order, we cannot use | |
1555 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
1556 | */ | |
1557 | if (sdkp->WCE) | |
007365ad TH |
1558 | ordered = sdkp->DPOFUA |
1559 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
1560 | else |
1561 | ordered = QUEUE_ORDERED_DRAIN; | |
1562 | ||
1563 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
1564 | ||
1da177e4 LT |
1565 | set_capacity(disk, sdkp->capacity); |
1566 | kfree(buffer); | |
1567 | ||
1da177e4 LT |
1568 | out: |
1569 | return 0; | |
1570 | } | |
1571 | ||
1572 | /** | |
1573 | * sd_probe - called during driver initialization and whenever a | |
1574 | * new scsi device is attached to the system. It is called once | |
1575 | * for each scsi device (not just disks) present. | |
1576 | * @dev: pointer to device object | |
1577 | * | |
1578 | * Returns 0 if successful (or not interested in this scsi device | |
1579 | * (e.g. scanner)); 1 when there is an error. | |
1580 | * | |
1581 | * Note: this function is invoked from the scsi mid-level. | |
1582 | * This function sets up the mapping between a given | |
1583 | * <host,channel,id,lun> (found in sdp) and new device name | |
1584 | * (e.g. /dev/sda). More precisely it is the block device major | |
1585 | * and minor number that is chosen here. | |
1586 | * | |
1587 | * Assume sd_attach is not re-entrant (for time being) | |
1588 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
1589 | **/ | |
1590 | static int sd_probe(struct device *dev) | |
1591 | { | |
1592 | struct scsi_device *sdp = to_scsi_device(dev); | |
1593 | struct scsi_disk *sdkp; | |
1594 | struct gendisk *gd; | |
1595 | u32 index; | |
1596 | int error; | |
1597 | ||
1598 | error = -ENODEV; | |
631e8a13 | 1599 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
1600 | goto out; |
1601 | ||
9ccfc756 JB |
1602 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
1603 | "sd_attach\n")); | |
1da177e4 LT |
1604 | |
1605 | error = -ENOMEM; | |
24669f75 | 1606 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
1607 | if (!sdkp) |
1608 | goto out; | |
1609 | ||
1da177e4 LT |
1610 | gd = alloc_disk(16); |
1611 | if (!gd) | |
1612 | goto out_free; | |
1613 | ||
1614 | if (!idr_pre_get(&sd_index_idr, GFP_KERNEL)) | |
1615 | goto out_put; | |
1616 | ||
1617 | spin_lock(&sd_index_lock); | |
1618 | error = idr_get_new(&sd_index_idr, NULL, &index); | |
1619 | spin_unlock(&sd_index_lock); | |
1620 | ||
1621 | if (index >= SD_MAX_DISKS) | |
1622 | error = -EBUSY; | |
1623 | if (error) | |
1624 | goto out_put; | |
1625 | ||
6bdaa1f1 JB |
1626 | class_device_initialize(&sdkp->cdev); |
1627 | sdkp->cdev.dev = &sdp->sdev_gendev; | |
1628 | sdkp->cdev.class = &sd_disk_class; | |
1629 | strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); | |
1630 | ||
1631 | if (class_device_add(&sdkp->cdev)) | |
1632 | goto out_put; | |
1633 | ||
39b7f1e2 | 1634 | get_device(&sdp->sdev_gendev); |
6bdaa1f1 | 1635 | |
1da177e4 LT |
1636 | sdkp->device = sdp; |
1637 | sdkp->driver = &sd_template; | |
1638 | sdkp->disk = gd; | |
1639 | sdkp->index = index; | |
1640 | sdkp->openers = 0; | |
1641 | ||
1642 | if (!sdp->timeout) { | |
631e8a13 | 1643 | if (sdp->type != TYPE_MOD) |
1da177e4 LT |
1644 | sdp->timeout = SD_TIMEOUT; |
1645 | else | |
1646 | sdp->timeout = SD_MOD_TIMEOUT; | |
1647 | } | |
1648 | ||
1649 | gd->major = sd_major((index & 0xf0) >> 4); | |
1650 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
1651 | gd->minors = 16; | |
1652 | gd->fops = &sd_fops; | |
1653 | ||
1654 | if (index < 26) { | |
1655 | sprintf(gd->disk_name, "sd%c", 'a' + index % 26); | |
1656 | } else if (index < (26 + 1) * 26) { | |
1657 | sprintf(gd->disk_name, "sd%c%c", | |
1658 | 'a' + index / 26 - 1,'a' + index % 26); | |
1659 | } else { | |
1660 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
1661 | const unsigned int m2 = (index / 26 - 1) % 26; | |
1662 | const unsigned int m3 = index % 26; | |
1663 | sprintf(gd->disk_name, "sd%c%c%c", | |
1664 | 'a' + m1, 'a' + m2, 'a' + m3); | |
1665 | } | |
1666 | ||
1da177e4 | 1667 | gd->private_data = &sdkp->driver; |
461d4e90 | 1668 | gd->queue = sdkp->device->request_queue; |
1da177e4 LT |
1669 | |
1670 | sd_revalidate_disk(gd); | |
1671 | ||
1672 | gd->driverfs_dev = &sdp->sdev_gendev; | |
1673 | gd->flags = GENHD_FL_DRIVERFS; | |
1674 | if (sdp->removable) | |
1675 | gd->flags |= GENHD_FL_REMOVABLE; | |
1da177e4 LT |
1676 | |
1677 | dev_set_drvdata(dev, sdkp); | |
1678 | add_disk(gd); | |
1679 | ||
9ccfc756 JB |
1680 | sdev_printk(KERN_NOTICE, sdp, "Attached scsi %sdisk %s\n", |
1681 | sdp->removable ? "removable " : "", gd->disk_name); | |
1da177e4 LT |
1682 | |
1683 | return 0; | |
1684 | ||
6bdaa1f1 | 1685 | out_put: |
1da177e4 | 1686 | put_disk(gd); |
6bdaa1f1 | 1687 | out_free: |
1da177e4 | 1688 | kfree(sdkp); |
6bdaa1f1 | 1689 | out: |
1da177e4 LT |
1690 | return error; |
1691 | } | |
1692 | ||
1693 | /** | |
1694 | * sd_remove - called whenever a scsi disk (previously recognized by | |
1695 | * sd_probe) is detached from the system. It is called (potentially | |
1696 | * multiple times) during sd module unload. | |
1697 | * @sdp: pointer to mid level scsi device object | |
1698 | * | |
1699 | * Note: this function is invoked from the scsi mid-level. | |
1700 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
1701 | * that could be re-used by a subsequent sd_probe(). | |
1702 | * This function is not called when the built-in sd driver is "exit-ed". | |
1703 | **/ | |
1704 | static int sd_remove(struct device *dev) | |
1705 | { | |
1706 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1707 | ||
6bdaa1f1 | 1708 | class_device_del(&sdkp->cdev); |
1da177e4 LT |
1709 | del_gendisk(sdkp->disk); |
1710 | sd_shutdown(dev); | |
39b7f1e2 | 1711 | |
0b950672 | 1712 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 1713 | dev_set_drvdata(dev, NULL); |
6bdaa1f1 | 1714 | class_device_put(&sdkp->cdev); |
0b950672 | 1715 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
1716 | |
1717 | return 0; | |
1718 | } | |
1719 | ||
1720 | /** | |
1721 | * scsi_disk_release - Called to free the scsi_disk structure | |
6bdaa1f1 | 1722 | * @cdev: pointer to embedded class device |
1da177e4 | 1723 | * |
0b950672 | 1724 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1725 | * called on last put, you should always use the scsi_disk_get() |
1726 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
6bdaa1f1 | 1727 | * and never do a direct class_device_put(). |
1da177e4 | 1728 | **/ |
6bdaa1f1 | 1729 | static void scsi_disk_release(struct class_device *cdev) |
1da177e4 | 1730 | { |
6bdaa1f1 | 1731 | struct scsi_disk *sdkp = to_scsi_disk(cdev); |
1da177e4 LT |
1732 | struct gendisk *disk = sdkp->disk; |
1733 | ||
1734 | spin_lock(&sd_index_lock); | |
1735 | idr_remove(&sd_index_idr, sdkp->index); | |
1736 | spin_unlock(&sd_index_lock); | |
1737 | ||
1738 | disk->private_data = NULL; | |
1da177e4 | 1739 | put_disk(disk); |
39b7f1e2 | 1740 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
1741 | |
1742 | kfree(sdkp); | |
1743 | } | |
1744 | ||
1745 | /* | |
1746 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
1747 | * the normal SCSI command structure. Wait for the command to | |
1748 | * complete. | |
1749 | */ | |
1750 | static void sd_shutdown(struct device *dev) | |
1751 | { | |
1752 | struct scsi_device *sdp = to_scsi_device(dev); | |
39b7f1e2 | 1753 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
1754 | |
1755 | if (!sdkp) | |
1756 | return; /* this can happen */ | |
1757 | ||
39b7f1e2 AS |
1758 | if (sdkp->WCE) { |
1759 | printk(KERN_NOTICE "Synchronizing SCSI cache for disk %s: \n", | |
1760 | sdkp->disk->disk_name); | |
1761 | sd_sync_cache(sdp); | |
1762 | } | |
1763 | scsi_disk_put(sdkp); | |
1764 | } | |
1da177e4 LT |
1765 | |
1766 | /** | |
1767 | * init_sd - entry point for this driver (both when built in or when | |
1768 | * a module). | |
1769 | * | |
1770 | * Note: this function registers this driver with the scsi mid-level. | |
1771 | **/ | |
1772 | static int __init init_sd(void) | |
1773 | { | |
1774 | int majors = 0, i; | |
1775 | ||
1776 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
1777 | ||
1778 | for (i = 0; i < SD_MAJORS; i++) | |
1779 | if (register_blkdev(sd_major(i), "sd") == 0) | |
1780 | majors++; | |
1781 | ||
1782 | if (!majors) | |
1783 | return -ENODEV; | |
1784 | ||
6bdaa1f1 JB |
1785 | class_register(&sd_disk_class); |
1786 | ||
1da177e4 LT |
1787 | return scsi_register_driver(&sd_template.gendrv); |
1788 | } | |
1789 | ||
1790 | /** | |
1791 | * exit_sd - exit point for this driver (when it is a module). | |
1792 | * | |
1793 | * Note: this function unregisters this driver from the scsi mid-level. | |
1794 | **/ | |
1795 | static void __exit exit_sd(void) | |
1796 | { | |
1797 | int i; | |
1798 | ||
1799 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
1800 | ||
1801 | scsi_unregister_driver(&sd_template.gendrv); | |
1802 | for (i = 0; i < SD_MAJORS; i++) | |
1803 | unregister_blkdev(sd_major(i), "sd"); | |
6bdaa1f1 JB |
1804 | |
1805 | class_unregister(&sd_disk_class); | |
1da177e4 LT |
1806 | } |
1807 | ||
1da177e4 LT |
1808 | module_init(init_sd); |
1809 | module_exit(exit_sd); |