Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IDE I/O functions | |
3 | * | |
4 | * Basic PIO and command management functionality. | |
5 | * | |
6 | * This code was split off from ide.c. See ide.c for history and original | |
7 | * copyrights. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2, or (at your option) any | |
12 | * later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * For the avoidance of doubt the "preferred form" of this code is one which | |
20 | * is in an open non patent encumbered format. Where cryptographic key signing | |
21 | * forms part of the process of creating an executable the information | |
22 | * including keys needed to generate an equivalently functional executable | |
23 | * are deemed to be part of the source code. | |
24 | */ | |
25 | ||
26 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <linux/types.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/major.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/genhd.h> | |
37 | #include <linux/blkpg.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/pci.h> | |
41 | #include <linux/delay.h> | |
42 | #include <linux/ide.h> | |
3ceca727 | 43 | #include <linux/hdreg.h> |
1da177e4 LT |
44 | #include <linux/completion.h> |
45 | #include <linux/reboot.h> | |
46 | #include <linux/cdrom.h> | |
47 | #include <linux/seq_file.h> | |
48 | #include <linux/device.h> | |
49 | #include <linux/kmod.h> | |
50 | #include <linux/scatterlist.h> | |
1977f032 | 51 | #include <linux/bitops.h> |
1da177e4 LT |
52 | |
53 | #include <asm/byteorder.h> | |
54 | #include <asm/irq.h> | |
55 | #include <asm/uaccess.h> | |
56 | #include <asm/io.h> | |
1da177e4 | 57 | |
a7ff7d41 | 58 | static int __ide_end_request(ide_drive_t *drive, struct request *rq, |
bbc615b1 | 59 | int uptodate, unsigned int nr_bytes, int dequeue) |
1da177e4 LT |
60 | { |
61 | int ret = 1; | |
5e36bb6e KU |
62 | int error = 0; |
63 | ||
64 | if (uptodate <= 0) | |
65 | error = uptodate ? uptodate : -EIO; | |
1da177e4 | 66 | |
1da177e4 LT |
67 | /* |
68 | * if failfast is set on a request, override number of sectors and | |
69 | * complete the whole request right now | |
70 | */ | |
5e36bb6e | 71 | if (blk_noretry_request(rq) && error) |
41e9d344 | 72 | nr_bytes = rq->hard_nr_sectors << 9; |
1da177e4 | 73 | |
5e36bb6e | 74 | if (!blk_fs_request(rq) && error && !rq->errors) |
1da177e4 LT |
75 | rq->errors = -EIO; |
76 | ||
77 | /* | |
78 | * decide whether to reenable DMA -- 3 is a random magic for now, | |
79 | * if we DMA timeout more than 3 times, just stay in PIO | |
80 | */ | |
c3922048 BZ |
81 | if ((drive->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
82 | drive->retry_pio <= 3) { | |
83 | drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; | |
4a546e04 | 84 | ide_dma_on(drive); |
1da177e4 LT |
85 | } |
86 | ||
3c8a2cce | 87 | if (!blk_end_request(rq, error, nr_bytes)) |
1da177e4 | 88 | ret = 0; |
a72b2147 BZ |
89 | |
90 | if (ret == 0 && dequeue) | |
b65fac32 | 91 | drive->hwif->rq = NULL; |
8672d571 | 92 | |
1da177e4 LT |
93 | return ret; |
94 | } | |
1da177e4 LT |
95 | |
96 | /** | |
97 | * ide_end_request - complete an IDE I/O | |
98 | * @drive: IDE device for the I/O | |
99 | * @uptodate: | |
100 | * @nr_sectors: number of sectors completed | |
101 | * | |
102 | * This is our end_request wrapper function. We complete the I/O | |
103 | * update random number input and dequeue the request, which if | |
104 | * it was tagged may be out of order. | |
105 | */ | |
106 | ||
107 | int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors) | |
108 | { | |
41e9d344 | 109 | unsigned int nr_bytes = nr_sectors << 9; |
b65fac32 | 110 | struct request *rq = drive->hwif->rq; |
1da177e4 | 111 | |
41e9d344 JA |
112 | if (!nr_bytes) { |
113 | if (blk_pc_request(rq)) | |
114 | nr_bytes = rq->data_len; | |
115 | else | |
116 | nr_bytes = rq->hard_cur_sectors << 9; | |
117 | } | |
1da177e4 | 118 | |
a72b2147 | 119 | return __ide_end_request(drive, rq, uptodate, nr_bytes, 1); |
1da177e4 LT |
120 | } |
121 | EXPORT_SYMBOL(ide_end_request); | |
122 | ||
dbe217af AC |
123 | /** |
124 | * ide_end_dequeued_request - complete an IDE I/O | |
125 | * @drive: IDE device for the I/O | |
126 | * @uptodate: | |
127 | * @nr_sectors: number of sectors completed | |
128 | * | |
129 | * Complete an I/O that is no longer on the request queue. This | |
130 | * typically occurs when we pull the request and issue a REQUEST_SENSE. | |
131 | * We must still finish the old request but we must not tamper with the | |
132 | * queue in the meantime. | |
133 | * | |
134 | * NOTE: This path does not handle barrier, but barrier is not supported | |
135 | * on ide-cd anyway. | |
136 | */ | |
137 | ||
138 | int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq, | |
139 | int uptodate, int nr_sectors) | |
140 | { | |
4aff5e23 | 141 | BUG_ON(!blk_rq_started(rq)); |
1d0bf587 | 142 | |
a72b2147 | 143 | return __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0); |
dbe217af AC |
144 | } |
145 | EXPORT_SYMBOL_GPL(ide_end_dequeued_request); | |
146 | ||
1da177e4 LT |
147 | /** |
148 | * ide_end_drive_cmd - end an explicit drive command | |
149 | * @drive: command | |
150 | * @stat: status bits | |
151 | * @err: error bits | |
152 | * | |
153 | * Clean up after success/failure of an explicit drive command. | |
154 | * These get thrown onto the queue so they are synchronized with | |
155 | * real I/O operations on the drive. | |
156 | * | |
157 | * In LBA48 mode we have to read the register set twice to get | |
158 | * all the extra information out. | |
159 | */ | |
160 | ||
161 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
162 | { | |
b65fac32 BZ |
163 | ide_hwif_t *hwif = drive->hwif; |
164 | struct request *rq = hwif->rq; | |
1da177e4 | 165 | |
7267c337 | 166 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
167 | ide_task_t *task = (ide_task_t *)rq->special; |
168 | ||
395d8ef5 BZ |
169 | if (task) { |
170 | struct ide_taskfile *tf = &task->tf; | |
650d841d | 171 | |
650d841d | 172 | tf->error = err; |
650d841d | 173 | tf->status = stat; |
1da177e4 | 174 | |
374e042c | 175 | drive->hwif->tp_ops->tf_read(drive, task); |
395d8ef5 BZ |
176 | |
177 | if (task->tf_flags & IDE_TFLAG_DYN) | |
178 | kfree(task); | |
1da177e4 LT |
179 | } |
180 | } else if (blk_pm_request(rq)) { | |
3616b653 | 181 | ide_complete_pm_rq(drive, rq); |
1da177e4 LT |
182 | return; |
183 | } | |
184 | ||
b65fac32 | 185 | hwif->rq = NULL; |
1d0bf587 | 186 | |
1da177e4 | 187 | rq->errors = err; |
1d0bf587 | 188 | |
3c8a2cce BZ |
189 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
190 | blk_rq_bytes(rq)))) | |
5e36bb6e | 191 | BUG(); |
1da177e4 | 192 | } |
1da177e4 LT |
193 | EXPORT_SYMBOL(ide_end_drive_cmd); |
194 | ||
327fa1c2 | 195 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 LT |
196 | { |
197 | if (rq->rq_disk) { | |
7f3c868b | 198 | struct ide_driver *drv; |
1da177e4 | 199 | |
7f3c868b | 200 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
1da177e4 LT |
201 | drv->end_request(drive, 0, 0); |
202 | } else | |
203 | ide_end_request(drive, 0, 0); | |
204 | } | |
205 | ||
57d7366b | 206 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 207 | { |
57d7366b BZ |
208 | tf->nsect = drive->sect; |
209 | tf->lbal = drive->sect; | |
210 | tf->lbam = drive->cyl; | |
211 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 212 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 213 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
214 | } |
215 | ||
57d7366b | 216 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 217 | { |
57d7366b | 218 | tf->nsect = drive->sect; |
aaaade3f | 219 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
220 | } |
221 | ||
57d7366b | 222 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 223 | { |
57d7366b | 224 | tf->nsect = drive->mult_req; |
aaaade3f | 225 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
226 | } |
227 | ||
228 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
229 | { | |
230 | special_t *s = &drive->special; | |
231 | ide_task_t args; | |
232 | ||
233 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 234 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
235 | |
236 | if (s->b.set_geometry) { | |
237 | s->b.set_geometry = 0; | |
57d7366b | 238 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
239 | } else if (s->b.recalibrate) { |
240 | s->b.recalibrate = 0; | |
57d7366b | 241 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
242 | } else if (s->b.set_multmode) { |
243 | s->b.set_multmode = 0; | |
57d7366b | 244 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
245 | } else if (s->all) { |
246 | int special = s->all; | |
247 | s->all = 0; | |
248 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
249 | return ide_stopped; | |
250 | } | |
251 | ||
657cc1a8 | 252 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 253 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 254 | |
1da177e4 LT |
255 | do_rw_taskfile(drive, &args); |
256 | ||
257 | return ide_started; | |
258 | } | |
259 | ||
260 | /** | |
261 | * do_special - issue some special commands | |
262 | * @drive: drive the command is for | |
263 | * | |
aaaade3f BZ |
264 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
265 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
266 | * | |
267 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
268 | */ |
269 | ||
270 | static ide_startstop_t do_special (ide_drive_t *drive) | |
271 | { | |
272 | special_t *s = &drive->special; | |
273 | ||
274 | #ifdef DEBUG | |
275 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
276 | #endif | |
6982daf7 BZ |
277 | if (drive->media == ide_disk) |
278 | return ide_disk_special(drive); | |
1da177e4 | 279 | |
6982daf7 BZ |
280 | s->all = 0; |
281 | drive->mult_req = 0; | |
282 | return ide_stopped; | |
1da177e4 LT |
283 | } |
284 | ||
285 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
286 | { | |
287 | ide_hwif_t *hwif = drive->hwif; | |
288 | struct scatterlist *sg = hwif->sg_table; | |
289 | ||
9e772d01 | 290 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
291 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
292 | hwif->sg_nents = 1; | |
9e772d01 BP |
293 | } else if (!rq->bio) { |
294 | sg_init_one(sg, rq->data, rq->data_len); | |
295 | hwif->sg_nents = 1; | |
296 | } else { | |
297 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 LT |
298 | } |
299 | } | |
300 | ||
301 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
302 | ||
303 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
304 | { | |
305 | ide_hwif_t *hwif = drive->hwif; | |
306 | ||
307 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
308 | hwif->cursg_ofs = 0; |
309 | hwif->cursg = NULL; | |
1da177e4 LT |
310 | } |
311 | ||
312 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
313 | ||
314 | /** | |
315 | * execute_drive_command - issue special drive command | |
338cec32 | 316 | * @drive: the drive to issue the command on |
1da177e4 LT |
317 | * @rq: the request structure holding the command |
318 | * | |
319 | * execute_drive_cmd() issues a special drive command, usually | |
320 | * initiated by ioctl() from the external hdparm program. The | |
321 | * command can be a drive command, drive task or taskfile | |
322 | * operation. Weirdly you can call it with NULL to wait for | |
323 | * all commands to finish. Don't do this as that is due to change | |
324 | */ | |
325 | ||
326 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
327 | struct request *rq) | |
328 | { | |
898ec223 | 329 | ide_hwif_t *hwif = drive->hwif; |
7267c337 | 330 | ide_task_t *task = rq->special; |
1da177e4 | 331 | |
7267c337 | 332 | if (task) { |
21d535c9 | 333 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
334 | |
335 | switch (hwif->data_phase) { | |
336 | case TASKFILE_MULTI_OUT: | |
337 | case TASKFILE_OUT: | |
338 | case TASKFILE_MULTI_IN: | |
339 | case TASKFILE_IN: | |
340 | ide_init_sg_cmd(drive, rq); | |
341 | ide_map_sg(drive, rq); | |
342 | default: | |
343 | break; | |
344 | } | |
74095a91 | 345 | |
21d535c9 BZ |
346 | return do_rw_taskfile(drive, task); |
347 | } | |
348 | ||
1da177e4 LT |
349 | /* |
350 | * NULL is actually a valid way of waiting for | |
351 | * all current requests to be flushed from the queue. | |
352 | */ | |
353 | #ifdef DEBUG | |
354 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
355 | #endif | |
374e042c | 356 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 357 | ide_read_error(drive)); |
64a57fe4 | 358 | |
1da177e4 | 359 | return ide_stopped; |
1bc6daae BZ |
360 | } |
361 | ||
79e36a9f EO |
362 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
363 | { | |
4abdc6ee EO |
364 | u8 cmd = rq->cmd[0]; |
365 | ||
4abdc6ee | 366 | switch (cmd) { |
1bc6daae BZ |
367 | case REQ_PARK_HEADS: |
368 | case REQ_UNPARK_HEADS: | |
369 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 370 | case REQ_DEVSET_EXEC: |
1bc6daae | 371 | return ide_do_devset(drive, rq); |
79e36a9f EO |
372 | case REQ_DRIVE_RESET: |
373 | return ide_do_reset(drive); | |
374 | default: | |
375 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
376 | ide_end_request(drive, 0, 0); | |
377 | return ide_stopped; | |
378 | } | |
379 | } | |
380 | ||
1da177e4 LT |
381 | /** |
382 | * start_request - start of I/O and command issuing for IDE | |
383 | * | |
384 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 385 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
386 | * |
387 | * FIXME: this function needs a rename | |
388 | */ | |
389 | ||
390 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
391 | { | |
392 | ide_startstop_t startstop; | |
1da177e4 | 393 | |
4aff5e23 | 394 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
395 | |
396 | #ifdef DEBUG | |
397 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 398 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
399 | #endif |
400 | ||
401 | /* bail early if we've exceeded max_failures */ | |
402 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 403 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
404 | goto kill_rq; |
405 | } | |
406 | ||
ad3cadda JA |
407 | if (blk_pm_request(rq)) |
408 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
409 | |
410 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
411 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
412 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
413 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
414 | return startstop; | |
415 | } | |
416 | if (!drive->special.all) { | |
7f3c868b | 417 | struct ide_driver *drv; |
1da177e4 | 418 | |
513daadd SS |
419 | /* |
420 | * We reset the drive so we need to issue a SETFEATURES. | |
421 | * Do it _after_ do_special() restored device parameters. | |
422 | */ | |
423 | if (drive->current_speed == 0xff) | |
424 | ide_config_drive_speed(drive, drive->desired_speed); | |
425 | ||
7267c337 | 426 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
427 | return execute_drive_cmd(drive, rq); |
428 | else if (blk_pm_request(rq)) { | |
c00895ab | 429 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
430 | #ifdef DEBUG_PM |
431 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 432 | drive->name, pm->pm_step); |
1da177e4 LT |
433 | #endif |
434 | startstop = ide_start_power_step(drive, rq); | |
435 | if (startstop == ide_stopped && | |
0d346ba0 | 436 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 437 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 438 | return startstop; |
79e36a9f EO |
439 | } else if (!rq->rq_disk && blk_special_request(rq)) |
440 | /* | |
441 | * TODO: Once all ULDs have been modified to | |
442 | * check for specific op codes rather than | |
443 | * blindly accepting any special request, the | |
444 | * check for ->rq_disk above may be replaced | |
445 | * by a more suitable mechanism or even | |
446 | * dropped entirely. | |
447 | */ | |
448 | return ide_special_rq(drive, rq); | |
1da177e4 | 449 | |
7f3c868b | 450 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
451 | |
452 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
453 | } |
454 | return do_special(drive); | |
455 | kill_rq: | |
456 | ide_kill_rq(drive, rq); | |
457 | return ide_stopped; | |
458 | } | |
459 | ||
460 | /** | |
461 | * ide_stall_queue - pause an IDE device | |
462 | * @drive: drive to stall | |
463 | * @timeout: time to stall for (jiffies) | |
464 | * | |
465 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 466 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
467 | */ |
468 | ||
469 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
470 | { | |
471 | if (timeout > WAIT_WORSTCASE) | |
472 | timeout = WAIT_WORSTCASE; | |
473 | drive->sleep = timeout + jiffies; | |
97100fc8 | 474 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 475 | } |
1da177e4 LT |
476 | EXPORT_SYMBOL(ide_stall_queue); |
477 | ||
5b31f855 BZ |
478 | static inline int ide_lock_port(ide_hwif_t *hwif) |
479 | { | |
480 | if (hwif->busy) | |
481 | return 1; | |
482 | ||
483 | hwif->busy = 1; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
489 | { | |
490 | hwif->busy = 0; | |
491 | } | |
492 | ||
493 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
494 | { | |
495 | int rc = 0; | |
496 | ||
497 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
498 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
499 | if (rc == 0) { | |
e354c1d8 BZ |
500 | if (host->get_lock) |
501 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
502 | } |
503 | } | |
504 | return rc; | |
505 | } | |
506 | ||
507 | static inline void ide_unlock_host(struct ide_host *host) | |
508 | { | |
509 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
510 | if (host->release_lock) |
511 | host->release_lock(); | |
5b31f855 BZ |
512 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
513 | } | |
514 | } | |
515 | ||
1da177e4 | 516 | /* |
b65fac32 | 517 | * Issue a new request to a device. |
1da177e4 | 518 | */ |
295f0004 | 519 | void do_ide_request(struct request_queue *q) |
1da177e4 | 520 | { |
201bffa4 BZ |
521 | ide_drive_t *drive = q->queuedata; |
522 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 523 | struct ide_host *host = hwif->host; |
5b31f855 | 524 | struct request *rq = NULL; |
1da177e4 LT |
525 | ide_startstop_t startstop; |
526 | ||
201bffa4 BZ |
527 | /* |
528 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
529 | * though that is 3 requests, it must be seen as a single transaction. | |
530 | * we must not preempt this drive until that is complete | |
531 | */ | |
532 | if (blk_queue_flushing(q)) | |
1da177e4 | 533 | /* |
201bffa4 BZ |
534 | * small race where queue could get replugged during |
535 | * the 3-request flush cycle, just yank the plug since | |
536 | * we want it to finish asap | |
1da177e4 | 537 | */ |
201bffa4 | 538 | blk_remove_plug(q); |
1da177e4 | 539 | |
201bffa4 | 540 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
541 | |
542 | if (ide_lock_host(host, hwif)) | |
543 | goto plug_device_2; | |
544 | ||
b65fac32 | 545 | spin_lock_irq(&hwif->lock); |
295f0004 | 546 | |
5b31f855 | 547 | if (!ide_lock_port(hwif)) { |
42cf2611 | 548 | ide_hwif_t *prev_port; |
201bffa4 | 549 | repeat: |
bd53cbcc | 550 | prev_port = hwif->host->cur_port; |
b65fac32 | 551 | hwif->rq = NULL; |
2fb21150 | 552 | |
201bffa4 BZ |
553 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
554 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 555 | ide_unlock_port(hwif); |
201bffa4 BZ |
556 | goto plug_device; |
557 | } | |
558 | } | |
295f0004 | 559 | |
bd53cbcc BZ |
560 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
561 | hwif != prev_port) { | |
7299a391 | 562 | /* |
42cf2611 | 563 | * set nIEN for previous port, drives in the |
7299a391 BZ |
564 | * quirk_list may not like intr setups/cleanups |
565 | */ | |
b65fac32 | 566 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 567 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
568 | |
569 | hwif->host->cur_port = hwif; | |
1da177e4 | 570 | } |
b65fac32 | 571 | hwif->cur_dev = drive; |
4abdc6ee | 572 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 573 | |
b65fac32 | 574 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 575 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
576 | /* |
577 | * we know that the queue isn't empty, but this can happen | |
578 | * if the q->prep_rq_fn() decides to kill a request | |
579 | */ | |
580 | rq = elv_next_request(drive->queue); | |
201bffa4 | 581 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 582 | spin_lock_irq(&hwif->lock); |
201bffa4 | 583 | |
1da177e4 | 584 | if (!rq) { |
5b31f855 | 585 | ide_unlock_port(hwif); |
201bffa4 | 586 | goto out; |
1da177e4 LT |
587 | } |
588 | ||
589 | /* | |
590 | * Sanity: don't accept a request that isn't a PM request | |
591 | * if we are currently power managed. This is very important as | |
592 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
593 | * above to return us whatever is in the queue. Since we call | |
594 | * ide_do_request() ourselves, we end up taking requests while | |
595 | * the queue is blocked... | |
596 | * | |
597 | * We let requests forced at head of queue with ide-preempt | |
598 | * though. I hope that doesn't happen too much, hopefully not | |
599 | * unless the subdriver triggers such a thing in its own PM | |
600 | * state machine. | |
601 | */ | |
97100fc8 BZ |
602 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
603 | blk_pm_request(rq) == 0 && | |
604 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 605 | /* there should be no pending command at this point */ |
5b31f855 | 606 | ide_unlock_port(hwif); |
295f0004 | 607 | goto plug_device; |
1da177e4 LT |
608 | } |
609 | ||
b65fac32 | 610 | hwif->rq = rq; |
1da177e4 | 611 | |
b65fac32 | 612 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 613 | startstop = start_request(drive, rq); |
b65fac32 | 614 | spin_lock_irq(&hwif->lock); |
295f0004 | 615 | |
201bffa4 BZ |
616 | if (startstop == ide_stopped) |
617 | goto repeat; | |
618 | } else | |
619 | goto plug_device; | |
620 | out: | |
b65fac32 | 621 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
622 | if (rq == NULL) |
623 | ide_unlock_host(host); | |
201bffa4 | 624 | spin_lock_irq(q->queue_lock); |
295f0004 | 625 | return; |
1da177e4 | 626 | |
295f0004 | 627 | plug_device: |
b65fac32 | 628 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
629 | ide_unlock_host(host); |
630 | plug_device_2: | |
201bffa4 BZ |
631 | spin_lock_irq(q->queue_lock); |
632 | ||
633 | if (!elv_queue_empty(q)) | |
634 | blk_plug_device(q); | |
1da177e4 LT |
635 | } |
636 | ||
201bffa4 BZ |
637 | static void ide_plug_device(ide_drive_t *drive) |
638 | { | |
639 | struct request_queue *q = drive->queue; | |
640 | unsigned long flags; | |
641 | ||
642 | spin_lock_irqsave(q->queue_lock, flags); | |
643 | if (!elv_queue_empty(q)) | |
644 | blk_plug_device(q); | |
645 | spin_unlock_irqrestore(q->queue_lock, flags); | |
646 | } | |
647 | ||
b6a45a0b BZ |
648 | static int drive_is_ready(ide_drive_t *drive) |
649 | { | |
650 | ide_hwif_t *hwif = drive->hwif; | |
651 | u8 stat = 0; | |
652 | ||
653 | if (drive->waiting_for_dma) | |
654 | return hwif->dma_ops->dma_test_irq(drive); | |
655 | ||
656 | if (hwif->io_ports.ctl_addr && | |
657 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
658 | stat = hwif->tp_ops->read_altstatus(hwif); | |
659 | else | |
660 | /* Note: this may clear a pending IRQ!! */ | |
661 | stat = hwif->tp_ops->read_status(hwif); | |
662 | ||
663 | if (stat & ATA_BUSY) | |
664 | /* drive busy: definitely not interrupting */ | |
665 | return 0; | |
666 | ||
667 | /* drive ready: *might* be interrupting */ | |
668 | return 1; | |
669 | } | |
670 | ||
1da177e4 LT |
671 | /** |
672 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 673 | * @data: timer callback magic (hwif) |
1da177e4 LT |
674 | * |
675 | * An IDE command has timed out before the expected drive return | |
676 | * occurred. At this point we attempt to clean up the current | |
677 | * mess. If the current handler includes an expiry handler then | |
678 | * we invoke the expiry handler, and providing it is happy the | |
679 | * work is done. If that fails we apply generic recovery rules | |
680 | * invoking the handler and checking the drive DMA status. We | |
681 | * have an excessively incestuous relationship with the DMA | |
682 | * logic that wants cleaning up. | |
683 | */ | |
684 | ||
685 | void ide_timer_expiry (unsigned long data) | |
686 | { | |
b65fac32 | 687 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 688 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 689 | ide_handler_t *handler; |
1da177e4 | 690 | unsigned long flags; |
e0c6dcd8 | 691 | int wait = -1; |
201bffa4 | 692 | int plug_device = 0; |
1da177e4 | 693 | |
b65fac32 BZ |
694 | spin_lock_irqsave(&hwif->lock, flags); |
695 | ||
696 | handler = hwif->handler; | |
1da177e4 | 697 | |
b65fac32 | 698 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
699 | /* |
700 | * Either a marginal timeout occurred | |
701 | * (got the interrupt just as timer expired), | |
702 | * or we were "sleeping" to give other devices a chance. | |
703 | * Either way, we don't really want to complain about anything. | |
704 | */ | |
1da177e4 | 705 | } else { |
c38714ed BZ |
706 | ide_expiry_t *expiry = hwif->expiry; |
707 | ide_startstop_t startstop = ide_stopped; | |
708 | ||
b65fac32 | 709 | drive = hwif->cur_dev; |
c38714ed BZ |
710 | |
711 | if (expiry) { | |
712 | wait = expiry(drive); | |
713 | if (wait > 0) { /* continue */ | |
714 | /* reset timer */ | |
715 | hwif->timer.expires = jiffies + wait; | |
716 | hwif->req_gen_timer = hwif->req_gen; | |
717 | add_timer(&hwif->timer); | |
718 | spin_unlock_irqrestore(&hwif->lock, flags); | |
719 | return; | |
295f0004 | 720 | } |
1da177e4 | 721 | } |
c38714ed BZ |
722 | hwif->handler = NULL; |
723 | /* | |
724 | * We need to simulate a real interrupt when invoking | |
725 | * the handler() function, which means we need to | |
726 | * globally mask the specific IRQ: | |
727 | */ | |
728 | spin_unlock(&hwif->lock); | |
729 | /* disable_irq_nosync ?? */ | |
730 | disable_irq(hwif->irq); | |
731 | /* local CPU only, as if we were handling an interrupt */ | |
732 | local_irq_disable(); | |
733 | if (hwif->polling) { | |
734 | startstop = handler(drive); | |
735 | } else if (drive_is_ready(drive)) { | |
736 | if (drive->waiting_for_dma) | |
737 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
738 | if (hwif->ack_intr) |
739 | hwif->ack_intr(hwif); | |
c38714ed BZ |
740 | printk(KERN_WARNING "%s: lost interrupt\n", |
741 | drive->name); | |
742 | startstop = handler(drive); | |
743 | } else { | |
744 | if (drive->waiting_for_dma) | |
745 | startstop = ide_dma_timeout_retry(drive, wait); | |
746 | else | |
747 | startstop = ide_error(drive, "irq timeout", | |
748 | hwif->tp_ops->read_status(hwif)); | |
749 | } | |
750 | spin_lock_irq(&hwif->lock); | |
751 | enable_irq(hwif->irq); | |
752 | if (startstop == ide_stopped) { | |
753 | ide_unlock_port(hwif); | |
754 | plug_device = 1; | |
755 | } | |
1da177e4 | 756 | } |
b65fac32 | 757 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 758 | |
5b31f855 BZ |
759 | if (plug_device) { |
760 | ide_unlock_host(hwif->host); | |
201bffa4 | 761 | ide_plug_device(drive); |
5b31f855 | 762 | } |
1da177e4 LT |
763 | } |
764 | ||
765 | /** | |
766 | * unexpected_intr - handle an unexpected IDE interrupt | |
767 | * @irq: interrupt line | |
bd53cbcc | 768 | * @hwif: port being processed |
1da177e4 LT |
769 | * |
770 | * There's nothing really useful we can do with an unexpected interrupt, | |
771 | * other than reading the status register (to clear it), and logging it. | |
772 | * There should be no way that an irq can happen before we're ready for it, | |
773 | * so we needn't worry much about losing an "important" interrupt here. | |
774 | * | |
775 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
776 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
777 | * looks "good", we just ignore the interrupt completely. | |
778 | * | |
779 | * This routine assumes __cli() is in effect when called. | |
780 | * | |
781 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
782 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
783 | * we could screw up by interfering with a new request being set up for | |
784 | * irq15. | |
785 | * | |
786 | * In reality, this is a non-issue. The new command is not sent unless | |
787 | * the drive is ready to accept one, in which case we know the drive is | |
788 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
789 | * before completing the issuance of any new drive command, so we will not | |
790 | * be accidentally invoked as a result of any valid command completion | |
791 | * interrupt. | |
1da177e4 | 792 | */ |
bd53cbcc BZ |
793 | |
794 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 795 | { |
ae86afae BZ |
796 | u8 stat = hwif->tp_ops->read_status(hwif); |
797 | ||
798 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
799 | /* Try to not flood the console with msgs */ | |
800 | static unsigned long last_msgtime, count; | |
801 | ++count; | |
802 | ||
803 | if (time_after(jiffies, last_msgtime + HZ)) { | |
804 | last_msgtime = jiffies; | |
805 | printk(KERN_ERR "%s: unexpected interrupt, " | |
806 | "status=0x%02x, count=%ld\n", | |
807 | hwif->name, stat, count); | |
1da177e4 | 808 | } |
ae86afae | 809 | } |
1da177e4 LT |
810 | } |
811 | ||
812 | /** | |
813 | * ide_intr - default IDE interrupt handler | |
814 | * @irq: interrupt number | |
ae86afae | 815 | * @dev_id: hwif |
1da177e4 LT |
816 | * @regs: unused weirdness from the kernel irq layer |
817 | * | |
818 | * This is the default IRQ handler for the IDE layer. You should | |
819 | * not need to override it. If you do be aware it is subtle in | |
820 | * places | |
821 | * | |
bd53cbcc | 822 | * hwif is the interface in the group currently performing |
b65fac32 | 823 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
824 | * the IRQ handler to call. As we issue a command the handlers |
825 | * step through multiple states, reassigning the handler to the | |
826 | * next step in the process. Unlike a smart SCSI controller IDE | |
827 | * expects the main processor to sequence the various transfer | |
828 | * stages. We also manage a poll timer to catch up with most | |
829 | * timeout situations. There are still a few where the handlers | |
830 | * don't ever decide to give up. | |
831 | * | |
832 | * The handler eventually returns ide_stopped to indicate the | |
833 | * request completed. At this point we issue the next request | |
b65fac32 | 834 | * on the port and the process begins again. |
1da177e4 | 835 | */ |
b65fac32 | 836 | |
7d12e780 | 837 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 838 | { |
ae86afae | 839 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 840 | struct ide_host *host = hwif->host; |
201bffa4 | 841 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 842 | ide_handler_t *handler; |
ae86afae | 843 | unsigned long flags; |
1da177e4 | 844 | ide_startstop_t startstop; |
3e0e29f7 | 845 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 846 | int plug_device = 0; |
1da177e4 | 847 | |
255115fb BZ |
848 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
849 | if (hwif != host->cur_port) | |
ae86afae BZ |
850 | goto out_early; |
851 | } | |
bd53cbcc | 852 | |
b65fac32 | 853 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 854 | |
d15a613b | 855 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 856 | goto out; |
1da177e4 | 857 | |
b65fac32 BZ |
858 | handler = hwif->handler; |
859 | ||
860 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
861 | /* |
862 | * Not expecting an interrupt from this drive. | |
863 | * That means this could be: | |
864 | * (1) an interrupt from another PCI device | |
865 | * sharing the same PCI INT# as us. | |
866 | * or (2) a drive just entered sleep or standby mode, | |
867 | * and is interrupting to let us know. | |
868 | * or (3) a spurious interrupt of unknown origin. | |
869 | * | |
870 | * For PCI, we cannot tell the difference, | |
871 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 872 | */ |
255115fb | 873 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
874 | /* |
875 | * Probably not a shared PCI interrupt, | |
876 | * so we can safely try to do something about it: | |
877 | */ | |
bd53cbcc | 878 | unexpected_intr(irq, hwif); |
1da177e4 LT |
879 | } else { |
880 | /* | |
881 | * Whack the status register, just in case | |
882 | * we have a leftover pending IRQ. | |
883 | */ | |
374e042c | 884 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 885 | } |
3e0e29f7 | 886 | goto out; |
1da177e4 | 887 | } |
3e0e29f7 | 888 | |
b65fac32 | 889 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
890 | |
891 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
892 | /* |
893 | * This happens regularly when we share a PCI IRQ with | |
894 | * another device. Unfortunately, it can also happen | |
895 | * with some buggy drives that trigger the IRQ before | |
896 | * their status register is up to date. Hopefully we have | |
897 | * enough advance overhead that the latter isn't a problem. | |
898 | */ | |
3e0e29f7 BZ |
899 | goto out; |
900 | ||
b65fac32 BZ |
901 | hwif->handler = NULL; |
902 | hwif->req_gen++; | |
903 | del_timer(&hwif->timer); | |
904 | spin_unlock(&hwif->lock); | |
1da177e4 | 905 | |
bfa7d8e5 BZ |
906 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
907 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 908 | |
97100fc8 | 909 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 910 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 911 | |
1da177e4 LT |
912 | /* service this interrupt, may set handler for next interrupt */ |
913 | startstop = handler(drive); | |
1da177e4 | 914 | |
b65fac32 | 915 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
916 | /* |
917 | * Note that handler() may have set things up for another | |
918 | * interrupt to occur soon, but it cannot happen until | |
919 | * we exit from this routine, because it will be the | |
920 | * same irq as is currently being serviced here, and Linux | |
921 | * won't allow another of the same (on any CPU) until we return. | |
922 | */ | |
1da177e4 | 923 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
924 | BUG_ON(hwif->handler); |
925 | ide_unlock_port(hwif); | |
926 | plug_device = 1; | |
1da177e4 | 927 | } |
3e0e29f7 BZ |
928 | irq_ret = IRQ_HANDLED; |
929 | out: | |
b65fac32 | 930 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 931 | out_early: |
5b31f855 BZ |
932 | if (plug_device) { |
933 | ide_unlock_host(hwif->host); | |
201bffa4 | 934 | ide_plug_device(drive); |
5b31f855 | 935 | } |
201bffa4 | 936 | |
3e0e29f7 | 937 | return irq_ret; |
1da177e4 | 938 | } |
849d7130 | 939 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 940 | |
9f87abe8 BZ |
941 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
942 | { | |
943 | ide_hwif_t *hwif = drive->hwif; | |
944 | u8 buf[4] = { 0 }; | |
945 | ||
946 | while (len > 0) { | |
947 | if (write) | |
374e042c | 948 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 949 | else |
374e042c | 950 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
951 | len -= 4; |
952 | } | |
953 | } | |
954 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |