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1da177e4 LT |
1 | /* |
2 | * sr.c Copyright (C) 1992 David Giller | |
3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
4 | * | |
5 | * adapted from: | |
6 | * sd.c Copyright (C) 1992 Drew Eckhardt | |
7 | * Linux scsi disk driver by | |
8 | * Drew Eckhardt <drew@colorado.edu> | |
9 | * | |
10 | * Modified by Eric Youngdale ericy@andante.org to | |
11 | * add scatter-gather, multiple outstanding request, and other | |
12 | * enhancements. | |
13 | * | |
14 | * Modified by Eric Youngdale eric@andante.org to support loadable | |
15 | * low-level scsi drivers. | |
16 | * | |
17 | * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to | |
18 | * provide auto-eject. | |
19 | * | |
20 | * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the | |
21 | * generic cdrom interface | |
22 | * | |
23 | * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() | |
24 | * interface, capabilities probe additions, ioctl cleanups, etc. | |
25 | * | |
26 | * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs | |
27 | * | |
28 | * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM | |
29 | * transparently and lose the GHOST hack | |
30 | * | |
31 | * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
32 | * check resource allocation in sr_init and some cleanups | |
33 | */ | |
34 | ||
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/string.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/cdrom.h> | |
43 | #include <linux/interrupt.h> | |
44 | #include <linux/init.h> | |
45 | #include <linux/blkdev.h> | |
0b950672 | 46 | #include <linux/mutex.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
1da177e4 LT |
48 | #include <asm/uaccess.h> |
49 | ||
50 | #include <scsi/scsi.h> | |
51 | #include <scsi/scsi_dbg.h> | |
52 | #include <scsi/scsi_device.h> | |
53 | #include <scsi/scsi_driver.h> | |
820732b5 | 54 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
55 | #include <scsi/scsi_eh.h> |
56 | #include <scsi/scsi_host.h> | |
57 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ | |
1da177e4 LT |
58 | |
59 | #include "scsi_logging.h" | |
60 | #include "sr.h" | |
61 | ||
62 | ||
f018fa55 RH |
63 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
64 | MODULE_LICENSE("GPL"); | |
65 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); | |
d7b8bcb0 MT |
66 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
67 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); | |
f018fa55 | 68 | |
1da177e4 LT |
69 | #define SR_DISKS 256 |
70 | ||
1da177e4 LT |
71 | #define SR_CAPABILITIES \ |
72 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ | |
73 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ | |
6a2900b6 | 74 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
1da177e4 LT |
75 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
76 | CDC_MRW|CDC_MRW_W|CDC_RAM) | |
77 | ||
2a48fc0a | 78 | static DEFINE_MUTEX(sr_mutex); |
1da177e4 LT |
79 | static int sr_probe(struct device *); |
80 | static int sr_remove(struct device *); | |
7b3d9545 | 81 | static int sr_done(struct scsi_cmnd *); |
1da177e4 LT |
82 | |
83 | static struct scsi_driver sr_template = { | |
84 | .owner = THIS_MODULE, | |
85 | .gendrv = { | |
86 | .name = "sr", | |
87 | .probe = sr_probe, | |
88 | .remove = sr_remove, | |
89 | }, | |
7b3d9545 | 90 | .done = sr_done, |
1da177e4 LT |
91 | }; |
92 | ||
93 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
94 | static DEFINE_SPINLOCK(sr_index_lock); | |
95 | ||
96 | /* This semaphore is used to mediate the 0->1 reference get in the | |
97 | * face of object destruction (i.e. we can't allow a get on an | |
98 | * object after last put) */ | |
0b950672 | 99 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
100 | |
101 | static int sr_open(struct cdrom_device_info *, int); | |
102 | static void sr_release(struct cdrom_device_info *); | |
103 | ||
104 | static void get_sectorsize(struct scsi_cd *); | |
105 | static void get_capabilities(struct scsi_cd *); | |
106 | ||
93aae17a TH |
107 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
108 | unsigned int clearing, int slot); | |
1da177e4 LT |
109 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
110 | ||
111 | static struct cdrom_device_ops sr_dops = { | |
112 | .open = sr_open, | |
113 | .release = sr_release, | |
114 | .drive_status = sr_drive_status, | |
93aae17a | 115 | .check_events = sr_check_events, |
1da177e4 LT |
116 | .tray_move = sr_tray_move, |
117 | .lock_door = sr_lock_door, | |
118 | .select_speed = sr_select_speed, | |
119 | .get_last_session = sr_get_last_session, | |
120 | .get_mcn = sr_get_mcn, | |
121 | .reset = sr_reset, | |
122 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
123 | .capability = SR_CAPABILITIES, |
124 | .generic_packet = sr_packet, | |
125 | }; | |
126 | ||
127 | static void sr_kref_release(struct kref *kref); | |
128 | ||
129 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
130 | { | |
131 | return container_of(disk->private_data, struct scsi_cd, driver); | |
132 | } | |
133 | ||
134 | /* | |
135 | * The get and put routines for the struct scsi_cd. Note this entity | |
136 | * has a scsi_device pointer and owns a reference to this. | |
137 | */ | |
138 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
139 | { | |
140 | struct scsi_cd *cd = NULL; | |
141 | ||
0b950672 | 142 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
143 | if (disk->private_data == NULL) |
144 | goto out; | |
145 | cd = scsi_cd(disk); | |
146 | kref_get(&cd->kref); | |
147 | if (scsi_device_get(cd->device)) | |
148 | goto out_put; | |
149 | goto out; | |
150 | ||
151 | out_put: | |
152 | kref_put(&cd->kref, sr_kref_release); | |
153 | cd = NULL; | |
154 | out: | |
0b950672 | 155 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
156 | return cd; |
157 | } | |
158 | ||
858119e1 | 159 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
160 | { |
161 | struct scsi_device *sdev = cd->device; | |
162 | ||
0b950672 | 163 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
164 | kref_put(&cd->kref, sr_kref_release); |
165 | scsi_device_put(sdev); | |
0b950672 | 166 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
167 | } |
168 | ||
93aae17a TH |
169 | static unsigned int sr_get_events(struct scsi_device *sdev) |
170 | { | |
171 | u8 buf[8]; | |
172 | u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, | |
173 | 1, /* polled */ | |
174 | 0, 0, /* reserved */ | |
175 | 1 << 4, /* notification class: media */ | |
176 | 0, 0, /* reserved */ | |
177 | 0, sizeof(buf), /* allocation length */ | |
178 | 0, /* control */ | |
179 | }; | |
180 | struct event_header *eh = (void *)buf; | |
181 | struct media_event_desc *med = (void *)(buf + 4); | |
182 | struct scsi_sense_hdr sshdr; | |
183 | int result; | |
184 | ||
185 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), | |
186 | &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); | |
187 | if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) | |
188 | return DISK_EVENT_MEDIA_CHANGE; | |
189 | ||
190 | if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) | |
191 | return 0; | |
192 | ||
193 | if (eh->nea || eh->notification_class != 0x4) | |
194 | return 0; | |
195 | ||
196 | if (med->media_event_code == 1) | |
197 | return DISK_EVENT_EJECT_REQUEST; | |
198 | else if (med->media_event_code == 2) | |
199 | return DISK_EVENT_MEDIA_CHANGE; | |
200 | return 0; | |
201 | } | |
202 | ||
1da177e4 | 203 | /* |
93aae17a TH |
204 | * This function checks to see if the media has been changed or eject |
205 | * button has been pressed. It is possible that we have already | |
206 | * sensed a change, or the drive may have sensed one and not yet | |
207 | * reported it. The past events are accumulated in sdev->changed and | |
208 | * returned together with the current state. | |
1da177e4 | 209 | */ |
93aae17a TH |
210 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
211 | unsigned int clearing, int slot) | |
1da177e4 LT |
212 | { |
213 | struct scsi_cd *cd = cdi->handle; | |
93aae17a TH |
214 | bool last_present; |
215 | struct scsi_sense_hdr sshdr; | |
216 | unsigned int events; | |
217 | int ret; | |
1da177e4 | 218 | |
93aae17a TH |
219 | /* no changer support */ |
220 | if (CDSL_CURRENT != slot) | |
221 | return 0; | |
222 | ||
223 | events = sr_get_events(cd->device); | |
224 | /* | |
225 | * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE | |
226 | * is being cleared. Note that there are devices which hang | |
227 | * if asked to execute TUR repeatedly. | |
228 | */ | |
229 | if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) | |
230 | goto skip_tur; | |
231 | ||
232 | /* let's see whether the media is there with TUR */ | |
233 | last_present = cd->media_present; | |
234 | ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); | |
1da177e4 | 235 | |
638428ec TH |
236 | /* |
237 | * Media is considered to be present if TUR succeeds or fails with | |
238 | * sense data indicating something other than media-not-present | |
239 | * (ASC 0x3a). | |
240 | */ | |
93aae17a TH |
241 | cd->media_present = scsi_status_is_good(ret) || |
242 | (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); | |
1da177e4 | 243 | |
93aae17a TH |
244 | if (last_present != cd->media_present) |
245 | events |= DISK_EVENT_MEDIA_CHANGE; | |
246 | skip_tur: | |
247 | if (cd->device->changed) { | |
248 | events |= DISK_EVENT_MEDIA_CHANGE; | |
249 | cd->device->changed = 0; | |
1da177e4 | 250 | } |
285e9670 | 251 | |
93aae17a | 252 | return events; |
1da177e4 | 253 | } |
93aae17a | 254 | |
1da177e4 | 255 | /* |
7b3d9545 | 256 | * sr_done is the interrupt routine for the device driver. |
1da177e4 | 257 | * |
7b3d9545 | 258 | * It will be notified on the end of a SCSI read / write, and will take one |
1da177e4 LT |
259 | * of several actions based on success or failure. |
260 | */ | |
7b3d9545 | 261 | static int sr_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
262 | { |
263 | int result = SCpnt->result; | |
30b0c37b | 264 | int this_count = scsi_bufflen(SCpnt); |
1da177e4 LT |
265 | int good_bytes = (result == 0 ? this_count : 0); |
266 | int block_sectors = 0; | |
267 | long error_sector; | |
268 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
269 | ||
270 | #ifdef DEBUG | |
271 | printk("sr.c done: %x\n", result); | |
272 | #endif | |
273 | ||
274 | /* | |
275 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
276 | * success. Since this is a relatively rare error condition, no | |
277 | * care is taken to avoid unnecessary additional work such as | |
278 | * memcpy's that could be avoided. | |
279 | */ | |
280 | if (driver_byte(result) != 0 && /* An error occurred */ | |
281 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
282 | switch (SCpnt->sense_buffer[2]) { | |
283 | case MEDIUM_ERROR: | |
284 | case VOLUME_OVERFLOW: | |
285 | case ILLEGAL_REQUEST: | |
286 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
287 | break; | |
1da177e4 LT |
288 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
289 | (SCpnt->sense_buffer[4] << 16) | | |
290 | (SCpnt->sense_buffer[5] << 8) | | |
291 | SCpnt->sense_buffer[6]; | |
292 | if (SCpnt->request->bio != NULL) | |
293 | block_sectors = | |
294 | bio_sectors(SCpnt->request->bio); | |
295 | if (block_sectors < 4) | |
296 | block_sectors = 4; | |
297 | if (cd->device->sector_size == 2048) | |
298 | error_sector <<= 2; | |
299 | error_sector &= ~(block_sectors - 1); | |
83096ebf TH |
300 | good_bytes = (error_sector - |
301 | blk_rq_pos(SCpnt->request)) << 9; | |
1da177e4 LT |
302 | if (good_bytes < 0 || good_bytes >= this_count) |
303 | good_bytes = 0; | |
304 | /* | |
305 | * The SCSI specification allows for the value | |
306 | * returned by READ CAPACITY to be up to 75 2K | |
307 | * sectors past the last readable block. | |
308 | * Therefore, if we hit a medium error within the | |
309 | * last 75 2K sectors, we decrease the saved size | |
310 | * value. | |
311 | */ | |
312 | if (error_sector < get_capacity(cd->disk) && | |
313 | cd->capacity - error_sector < 4 * 75) | |
314 | set_capacity(cd->disk, error_sector); | |
315 | break; | |
316 | ||
317 | case RECOVERED_ERROR: | |
1da177e4 LT |
318 | good_bytes = this_count; |
319 | break; | |
320 | ||
321 | default: | |
322 | break; | |
323 | } | |
324 | } | |
325 | ||
7b3d9545 | 326 | return good_bytes; |
1da177e4 LT |
327 | } |
328 | ||
7f9a6bc4 | 329 | static int sr_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 330 | { |
242f9dcb | 331 | int block = 0, this_count, s_size; |
7f9a6bc4 JB |
332 | struct scsi_cd *cd; |
333 | struct scsi_cmnd *SCpnt; | |
334 | struct scsi_device *sdp = q->queuedata; | |
335 | int ret; | |
336 | ||
337 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { | |
338 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); | |
339 | goto out; | |
340 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
341 | ret = BLKPREP_KILL; | |
342 | goto out; | |
343 | } | |
344 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
345 | if (ret != BLKPREP_OK) | |
346 | goto out; | |
347 | SCpnt = rq->special; | |
348 | cd = scsi_cd(rq->rq_disk); | |
349 | ||
350 | /* from here on until we're complete, any goto out | |
351 | * is used for a killable error condition */ | |
352 | ret = BLKPREP_KILL; | |
1da177e4 LT |
353 | |
354 | SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", | |
355 | cd->disk->disk_name, block)); | |
356 | ||
357 | if (!cd->device || !scsi_device_online(cd->device)) { | |
83096ebf TH |
358 | SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", |
359 | blk_rq_sectors(rq))); | |
1da177e4 | 360 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); |
7f9a6bc4 | 361 | goto out; |
1da177e4 LT |
362 | } |
363 | ||
364 | if (cd->device->changed) { | |
365 | /* | |
366 | * quietly refuse to do anything to a changed disc until the | |
367 | * changed bit has been reset | |
368 | */ | |
7f9a6bc4 | 369 | goto out; |
1da177e4 LT |
370 | } |
371 | ||
1da177e4 LT |
372 | /* |
373 | * we do lazy blocksize switching (when reading XA sectors, | |
374 | * see CDROMREADMODE2 ioctl) | |
375 | */ | |
376 | s_size = cd->device->sector_size; | |
377 | if (s_size > 2048) { | |
378 | if (!in_interrupt()) | |
379 | sr_set_blocklength(cd, 2048); | |
380 | else | |
381 | printk("sr: can't switch blocksize: in interrupt\n"); | |
382 | } | |
383 | ||
384 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { | |
3bf743e7 | 385 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
7f9a6bc4 | 386 | goto out; |
1da177e4 LT |
387 | } |
388 | ||
7f9a6bc4 | 389 | if (rq_data_dir(rq) == WRITE) { |
1da177e4 | 390 | if (!cd->device->writeable) |
7f9a6bc4 | 391 | goto out; |
1da177e4 LT |
392 | SCpnt->cmnd[0] = WRITE_10; |
393 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
394 | cd->cdi.media_written = 1; | |
7f9a6bc4 | 395 | } else if (rq_data_dir(rq) == READ) { |
1da177e4 LT |
396 | SCpnt->cmnd[0] = READ_10; |
397 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
398 | } else { | |
7f9a6bc4 JB |
399 | blk_dump_rq_flags(rq, "Unknown sr command"); |
400 | goto out; | |
1da177e4 LT |
401 | } |
402 | ||
403 | { | |
30b0c37b BH |
404 | struct scatterlist *sg; |
405 | int i, size = 0, sg_count = scsi_sg_count(SCpnt); | |
1da177e4 | 406 | |
30b0c37b BH |
407 | scsi_for_each_sg(SCpnt, sg, sg_count, i) |
408 | size += sg->length; | |
409 | ||
410 | if (size != scsi_bufflen(SCpnt)) { | |
3bf743e7 JG |
411 | scmd_printk(KERN_ERR, SCpnt, |
412 | "mismatch count %d, bytes %d\n", | |
30b0c37b BH |
413 | size, scsi_bufflen(SCpnt)); |
414 | if (scsi_bufflen(SCpnt) > size) | |
415 | SCpnt->sdb.length = size; | |
1da177e4 LT |
416 | } |
417 | } | |
418 | ||
419 | /* | |
420 | * request doesn't start on hw block boundary, add scatter pads | |
421 | */ | |
83096ebf | 422 | if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
30b0c37b | 423 | (scsi_bufflen(SCpnt) % s_size)) { |
3bf743e7 | 424 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
7f9a6bc4 | 425 | goto out; |
1da177e4 LT |
426 | } |
427 | ||
30b0c37b | 428 | this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
1da177e4 LT |
429 | |
430 | ||
83096ebf | 431 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", |
1da177e4 | 432 | cd->cdi.name, |
7f9a6bc4 | 433 | (rq_data_dir(rq) == WRITE) ? |
1da177e4 | 434 | "writing" : "reading", |
83096ebf | 435 | this_count, blk_rq_sectors(rq))); |
1da177e4 LT |
436 | |
437 | SCpnt->cmnd[1] = 0; | |
83096ebf | 438 | block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
1da177e4 LT |
439 | |
440 | if (this_count > 0xffff) { | |
441 | this_count = 0xffff; | |
30b0c37b | 442 | SCpnt->sdb.length = this_count * s_size; |
1da177e4 LT |
443 | } |
444 | ||
445 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; | |
446 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
447 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
448 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
449 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
450 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
451 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
452 | ||
453 | /* | |
454 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
455 | * host adapter, it's safe to assume that we can at least transfer | |
456 | * this many bytes between each connect / disconnect. | |
457 | */ | |
458 | SCpnt->transfersize = cd->device->sector_size; | |
459 | SCpnt->underflow = this_count << 9; | |
1da177e4 | 460 | SCpnt->allowed = MAX_RETRIES; |
1da177e4 | 461 | |
1da177e4 LT |
462 | /* |
463 | * This indicates that the command is ready from our end to be | |
464 | * queued. | |
465 | */ | |
7f9a6bc4 JB |
466 | ret = BLKPREP_OK; |
467 | out: | |
468 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
469 | } |
470 | ||
40cc51be | 471 | static int sr_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 472 | { |
6e9624b8 | 473 | struct scsi_cd *cd; |
40cc51be | 474 | int ret = -ENXIO; |
1da177e4 | 475 | |
2a48fc0a | 476 | mutex_lock(&sr_mutex); |
6e9624b8 | 477 | cd = scsi_cd_get(bdev->bd_disk); |
40cc51be AV |
478 | if (cd) { |
479 | ret = cdrom_open(&cd->cdi, bdev, mode); | |
480 | if (ret) | |
481 | scsi_cd_put(cd); | |
482 | } | |
2a48fc0a | 483 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
484 | return ret; |
485 | } | |
486 | ||
40cc51be | 487 | static int sr_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 488 | { |
40cc51be | 489 | struct scsi_cd *cd = scsi_cd(disk); |
2a48fc0a | 490 | mutex_lock(&sr_mutex); |
40cc51be | 491 | cdrom_release(&cd->cdi, mode); |
1da177e4 | 492 | scsi_cd_put(cd); |
2a48fc0a | 493 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
494 | return 0; |
495 | } | |
496 | ||
40cc51be | 497 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
1da177e4 LT |
498 | unsigned long arg) |
499 | { | |
40cc51be | 500 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
1da177e4 | 501 | struct scsi_device *sdev = cd->device; |
6a2900b6 CH |
502 | void __user *argp = (void __user *)arg; |
503 | int ret; | |
1da177e4 | 504 | |
2a48fc0a | 505 | mutex_lock(&sr_mutex); |
8a6cfeb6 | 506 | |
6a2900b6 CH |
507 | /* |
508 | * Send SCSI addressing ioctls directly to mid level, send other | |
509 | * ioctls to cdrom/block level. | |
510 | */ | |
511 | switch (cmd) { | |
512 | case SCSI_IOCTL_GET_IDLUN: | |
513 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 AB |
514 | ret = scsi_ioctl(sdev, cmd, argp); |
515 | goto out; | |
1da177e4 | 516 | } |
6a2900b6 | 517 | |
40cc51be | 518 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
6397256b | 519 | if (ret != -ENOSYS) |
8a6cfeb6 | 520 | goto out; |
6a2900b6 CH |
521 | |
522 | /* | |
523 | * ENODEV means that we didn't recognise the ioctl, or that we | |
524 | * cannot execute it in the current device state. In either | |
525 | * case fall through to scsi_ioctl, which will return ENDOEV again | |
526 | * if it doesn't recognise the ioctl | |
527 | */ | |
83ff6fe8 | 528 | ret = scsi_nonblockable_ioctl(sdev, cmd, argp, |
fd4ce1ac | 529 | (mode & FMODE_NDELAY) != 0); |
6a2900b6 | 530 | if (ret != -ENODEV) |
8a6cfeb6 AB |
531 | goto out; |
532 | ret = scsi_ioctl(sdev, cmd, argp); | |
533 | ||
534 | out: | |
2a48fc0a | 535 | mutex_unlock(&sr_mutex); |
8a6cfeb6 | 536 | return ret; |
1da177e4 LT |
537 | } |
538 | ||
93aae17a TH |
539 | static unsigned int sr_block_check_events(struct gendisk *disk, |
540 | unsigned int clearing) | |
1da177e4 LT |
541 | { |
542 | struct scsi_cd *cd = scsi_cd(disk); | |
93aae17a TH |
543 | return cdrom_check_events(&cd->cdi, clearing); |
544 | } | |
545 | ||
546 | static int sr_block_revalidate_disk(struct gendisk *disk) | |
547 | { | |
548 | struct scsi_cd *cd = scsi_cd(disk); | |
549 | struct scsi_sense_hdr sshdr; | |
550 | ||
551 | /* if the unit is not ready, nothing more to do */ | |
552 | if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) | |
553 | return 0; | |
554 | ||
555 | sr_cd_check(&cd->cdi); | |
556 | get_sectorsize(cd); | |
557 | return 0; | |
1da177e4 LT |
558 | } |
559 | ||
83d5cde4 | 560 | static const struct block_device_operations sr_bdops = |
1da177e4 LT |
561 | { |
562 | .owner = THIS_MODULE, | |
40cc51be AV |
563 | .open = sr_block_open, |
564 | .release = sr_block_release, | |
8a6cfeb6 | 565 | .ioctl = sr_block_ioctl, |
93aae17a TH |
566 | .check_events = sr_block_check_events, |
567 | .revalidate_disk = sr_block_revalidate_disk, | |
1da177e4 LT |
568 | /* |
569 | * No compat_ioctl for now because sr_block_ioctl never | |
25985edc | 570 | * seems to pass arbitrary ioctls down to host drivers. |
1da177e4 LT |
571 | */ |
572 | }; | |
573 | ||
574 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
575 | { | |
576 | struct scsi_cd *cd = cdi->handle; | |
577 | struct scsi_device *sdev = cd->device; | |
578 | int retval; | |
579 | ||
580 | /* | |
581 | * If the device is in error recovery, wait until it is done. | |
582 | * If the device is offline, then disallow any access to it. | |
583 | */ | |
584 | retval = -ENXIO; | |
585 | if (!scsi_block_when_processing_errors(sdev)) | |
586 | goto error_out; | |
587 | ||
1da177e4 LT |
588 | return 0; |
589 | ||
590 | error_out: | |
591 | return retval; | |
592 | } | |
593 | ||
594 | static void sr_release(struct cdrom_device_info *cdi) | |
595 | { | |
596 | struct scsi_cd *cd = cdi->handle; | |
597 | ||
598 | if (cd->device->sector_size > 2048) | |
599 | sr_set_blocklength(cd, 2048); | |
600 | ||
601 | } | |
602 | ||
603 | static int sr_probe(struct device *dev) | |
604 | { | |
605 | struct scsi_device *sdev = to_scsi_device(dev); | |
606 | struct gendisk *disk; | |
607 | struct scsi_cd *cd; | |
608 | int minor, error; | |
609 | ||
610 | error = -ENODEV; | |
611 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
612 | goto fail; | |
613 | ||
614 | error = -ENOMEM; | |
24669f75 | 615 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
616 | if (!cd) |
617 | goto fail; | |
1da177e4 LT |
618 | |
619 | kref_init(&cd->kref); | |
620 | ||
621 | disk = alloc_disk(1); | |
622 | if (!disk) | |
623 | goto fail_free; | |
624 | ||
625 | spin_lock(&sr_index_lock); | |
626 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
627 | if (minor == SR_DISKS) { | |
628 | spin_unlock(&sr_index_lock); | |
629 | error = -EBUSY; | |
630 | goto fail_put; | |
631 | } | |
632 | __set_bit(minor, sr_index_bits); | |
633 | spin_unlock(&sr_index_lock); | |
634 | ||
635 | disk->major = SCSI_CDROM_MAJOR; | |
636 | disk->first_minor = minor; | |
637 | sprintf(disk->disk_name, "sr%d", minor); | |
638 | disk->fops = &sr_bdops; | |
639 | disk->flags = GENHD_FL_CD; | |
93aae17a | 640 | disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
1da177e4 | 641 | |
242f9dcb JA |
642 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
643 | ||
1da177e4 LT |
644 | cd->device = sdev; |
645 | cd->disk = disk; | |
646 | cd->driver = &sr_template; | |
647 | cd->disk = disk; | |
648 | cd->capacity = 0x1fffff; | |
1da177e4 | 649 | cd->device->changed = 1; /* force recheck CD type */ |
93aae17a | 650 | cd->media_present = 1; |
1da177e4 LT |
651 | cd->use = 1; |
652 | cd->readcd_known = 0; | |
653 | cd->readcd_cdda = 0; | |
654 | ||
655 | cd->cdi.ops = &sr_dops; | |
656 | cd->cdi.handle = cd; | |
657 | cd->cdi.mask = 0; | |
658 | cd->cdi.capacity = 1; | |
659 | sprintf(cd->cdi.name, "sr%d", minor); | |
660 | ||
661 | sdev->sector_size = 2048; /* A guess, just in case */ | |
662 | ||
663 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
664 | get_capabilities(cd); | |
7f9a6bc4 | 665 | blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); |
1da177e4 LT |
666 | sr_vendor_init(cd); |
667 | ||
1da177e4 LT |
668 | disk->driverfs_dev = &sdev->sdev_gendev; |
669 | set_capacity(disk, cd->capacity); | |
670 | disk->private_data = &cd->driver; | |
671 | disk->queue = sdev->request_queue; | |
672 | cd->cdi.disk = disk; | |
673 | ||
674 | if (register_cdrom(&cd->cdi)) | |
675 | goto fail_put; | |
676 | ||
677 | dev_set_drvdata(dev, cd); | |
678 | disk->flags |= GENHD_FL_REMOVABLE; | |
679 | add_disk(disk); | |
680 | ||
9ccfc756 JB |
681 | sdev_printk(KERN_DEBUG, sdev, |
682 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
1da177e4 LT |
683 | return 0; |
684 | ||
685 | fail_put: | |
686 | put_disk(disk); | |
687 | fail_free: | |
688 | kfree(cd); | |
689 | fail: | |
690 | return error; | |
691 | } | |
692 | ||
693 | ||
694 | static void get_sectorsize(struct scsi_cd *cd) | |
695 | { | |
696 | unsigned char cmd[10]; | |
62858dac | 697 | unsigned char buffer[8]; |
1da177e4 LT |
698 | int the_result, retries = 3; |
699 | int sector_size; | |
165125e1 | 700 | struct request_queue *queue; |
1da177e4 | 701 | |
1da177e4 LT |
702 | do { |
703 | cmd[0] = READ_CAPACITY; | |
704 | memset((void *) &cmd[1], 0, 9); | |
62858dac | 705 | memset(buffer, 0, sizeof(buffer)); |
1da177e4 LT |
706 | |
707 | /* Do the command and wait.. */ | |
820732b5 | 708 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
62858dac | 709 | buffer, sizeof(buffer), NULL, |
f4f4e47e | 710 | SR_TIMEOUT, MAX_RETRIES, NULL); |
1da177e4 | 711 | |
1da177e4 LT |
712 | retries--; |
713 | ||
714 | } while (the_result && retries); | |
715 | ||
716 | ||
1da177e4 LT |
717 | if (the_result) { |
718 | cd->capacity = 0x1fffff; | |
719 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 | 720 | } else { |
5915136d TH |
721 | long last_written; |
722 | ||
723 | cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | | |
724 | (buffer[2] << 8) | buffer[3]); | |
725 | /* | |
726 | * READ_CAPACITY doesn't return the correct size on | |
727 | * certain UDF media. If last_written is larger, use | |
728 | * it instead. | |
729 | * | |
730 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 | |
731 | */ | |
732 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) | |
733 | cd->capacity = max_t(long, cd->capacity, last_written); | |
734 | ||
1da177e4 LT |
735 | sector_size = (buffer[4] << 24) | |
736 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
737 | switch (sector_size) { | |
738 | /* | |
739 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
740 | * Philips CD-Writers report 2352 byte sectors | |
741 | * | |
742 | * Use 2k sectors for them.. | |
743 | */ | |
744 | case 0: | |
745 | case 2340: | |
746 | case 2352: | |
747 | sector_size = 2048; | |
748 | /* fall through */ | |
749 | case 2048: | |
750 | cd->capacity *= 4; | |
751 | /* fall through */ | |
752 | case 512: | |
753 | break; | |
754 | default: | |
755 | printk("%s: unsupported sector size %d.\n", | |
756 | cd->cdi.name, sector_size); | |
757 | cd->capacity = 0; | |
1da177e4 LT |
758 | } |
759 | ||
760 | cd->device->sector_size = sector_size; | |
761 | ||
762 | /* | |
763 | * Add this so that we have the ability to correctly gauge | |
764 | * what the device is capable of. | |
765 | */ | |
1da177e4 LT |
766 | set_capacity(cd->disk, cd->capacity); |
767 | } | |
768 | ||
769 | queue = cd->device->request_queue; | |
e1defc4f | 770 | blk_queue_logical_block_size(queue, sector_size); |
1da177e4 | 771 | |
62858dac | 772 | return; |
1da177e4 LT |
773 | } |
774 | ||
775 | static void get_capabilities(struct scsi_cd *cd) | |
776 | { | |
777 | unsigned char *buffer; | |
778 | struct scsi_mode_data data; | |
820732b5 | 779 | struct scsi_sense_hdr sshdr; |
38582a62 | 780 | int rc, n; |
1da177e4 | 781 | |
0ad78200 | 782 | static const char *loadmech[] = |
1da177e4 LT |
783 | { |
784 | "caddy", | |
785 | "tray", | |
786 | "pop-up", | |
787 | "", | |
788 | "changer", | |
789 | "cartridge changer", | |
790 | "", | |
791 | "" | |
792 | }; | |
793 | ||
1da177e4 LT |
794 | |
795 | /* allocate transfer buffer */ | |
796 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
797 | if (!buffer) { | |
798 | printk(KERN_ERR "sr: out of memory.\n"); | |
1da177e4 LT |
799 | return; |
800 | } | |
801 | ||
38582a62 | 802 | /* eat unit attentions */ |
9f8a2c23 | 803 | scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
1da177e4 LT |
804 | |
805 | /* ask for mode page 0x2a */ | |
806 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, | |
1cf72699 | 807 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 LT |
808 | |
809 | if (!scsi_status_is_good(rc)) { | |
810 | /* failed, drive doesn't have capabilities mode page */ | |
811 | cd->cdi.speed = 1; | |
812 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
813 | CDC_DVD | CDC_DVD_RAM | |
814 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
815 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 LT |
816 | kfree(buffer); |
817 | printk("%s: scsi-1 drive\n", cd->cdi.name); | |
818 | return; | |
819 | } | |
820 | ||
821 | n = data.header_length + data.block_descriptor_length; | |
822 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; | |
823 | cd->readcd_known = 1; | |
824 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
825 | /* print some capability bits */ | |
826 | printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, | |
827 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, | |
828 | cd->cdi.speed, | |
829 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
830 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
831 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
832 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
833 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
834 | loadmech[buffer[n + 6] >> 5]); | |
835 | if ((buffer[n + 6] >> 5) == 0) | |
836 | /* caddy drives can't close tray... */ | |
837 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
838 | if ((buffer[n + 2] & 0x8) == 0) | |
839 | /* not a DVD drive */ | |
840 | cd->cdi.mask |= CDC_DVD; | |
841 | if ((buffer[n + 3] & 0x20) == 0) | |
842 | /* can't write DVD-RAM media */ | |
843 | cd->cdi.mask |= CDC_DVD_RAM; | |
844 | if ((buffer[n + 3] & 0x10) == 0) | |
845 | /* can't write DVD-R media */ | |
846 | cd->cdi.mask |= CDC_DVD_R; | |
847 | if ((buffer[n + 3] & 0x2) == 0) | |
848 | /* can't write CD-RW media */ | |
849 | cd->cdi.mask |= CDC_CD_RW; | |
850 | if ((buffer[n + 3] & 0x1) == 0) | |
851 | /* can't write CD-R media */ | |
852 | cd->cdi.mask |= CDC_CD_R; | |
853 | if ((buffer[n + 6] & 0x8) == 0) | |
854 | /* can't eject */ | |
855 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
856 | ||
857 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
858 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
859 | cd->cdi.capacity = | |
860 | cdrom_number_of_slots(&cd->cdi); | |
861 | if (cd->cdi.capacity <= 1) | |
862 | /* not a changer */ | |
863 | cd->cdi.mask |= CDC_SELECT_DISC; | |
864 | /*else I don't think it can close its tray | |
865 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
866 | ||
867 | /* | |
868 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
869 | */ | |
870 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
871 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
872 | cd->device->writeable = 1; | |
873 | } | |
874 | ||
1da177e4 LT |
875 | kfree(buffer); |
876 | } | |
877 | ||
878 | /* | |
879 | * sr_packet() is the entry point for the generic commands generated | |
880 | * by the Uniform CD-ROM layer. | |
881 | */ | |
882 | static int sr_packet(struct cdrom_device_info *cdi, | |
883 | struct packet_command *cgc) | |
884 | { | |
8e04d805 HG |
885 | struct scsi_cd *cd = cdi->handle; |
886 | struct scsi_device *sdev = cd->device; | |
887 | ||
888 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) | |
889 | return -EDRIVE_CANT_DO_THIS; | |
890 | ||
1da177e4 LT |
891 | if (cgc->timeout <= 0) |
892 | cgc->timeout = IOCTL_TIMEOUT; | |
893 | ||
8e04d805 | 894 | sr_do_ioctl(cd, cgc); |
1da177e4 LT |
895 | |
896 | return cgc->stat; | |
897 | } | |
898 | ||
899 | /** | |
900 | * sr_kref_release - Called to free the scsi_cd structure | |
901 | * @kref: pointer to embedded kref | |
902 | * | |
0b950672 | 903 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
904 | * called on last put, you should always use the scsi_cd_get() |
905 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
906 | * and never do a direct kref_put(). | |
907 | **/ | |
908 | static void sr_kref_release(struct kref *kref) | |
909 | { | |
910 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
911 | struct gendisk *disk = cd->disk; | |
912 | ||
913 | spin_lock(&sr_index_lock); | |
f331c029 | 914 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
1da177e4 LT |
915 | spin_unlock(&sr_index_lock); |
916 | ||
917 | unregister_cdrom(&cd->cdi); | |
918 | ||
919 | disk->private_data = NULL; | |
920 | ||
921 | put_disk(disk); | |
922 | ||
923 | kfree(cd); | |
924 | } | |
925 | ||
926 | static int sr_remove(struct device *dev) | |
927 | { | |
928 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
929 | ||
b391277a | 930 | blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); |
1da177e4 LT |
931 | del_gendisk(cd->disk); |
932 | ||
0b950672 | 933 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 934 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 935 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
936 | |
937 | return 0; | |
938 | } | |
939 | ||
940 | static int __init init_sr(void) | |
941 | { | |
942 | int rc; | |
943 | ||
944 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
945 | if (rc) | |
946 | return rc; | |
da3962fe AM |
947 | rc = scsi_register_driver(&sr_template.gendrv); |
948 | if (rc) | |
949 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
950 | ||
951 | return rc; | |
1da177e4 LT |
952 | } |
953 | ||
954 | static void __exit exit_sr(void) | |
955 | { | |
956 | scsi_unregister_driver(&sr_template.gendrv); | |
957 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
958 | } | |
959 | ||
960 | module_init(init_sr); | |
961 | module_exit(exit_sr); | |
962 | MODULE_LICENSE("GPL"); |