Commit | Line | Data |
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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 | ||
e120237c BZ |
147 | static void ide_complete_task(ide_drive_t *drive, ide_task_t *task, |
148 | u8 stat, u8 err) | |
149 | { | |
150 | struct ide_taskfile *tf = &task->tf; | |
151 | ||
152 | tf->error = err; | |
153 | tf->status = stat; | |
154 | ||
155 | drive->hwif->tp_ops->tf_read(drive, task); | |
156 | ||
157 | if (task->tf_flags & IDE_TFLAG_DYN) | |
158 | kfree(task); | |
159 | } | |
160 | ||
1da177e4 LT |
161 | /** |
162 | * ide_end_drive_cmd - end an explicit drive command | |
163 | * @drive: command | |
164 | * @stat: status bits | |
165 | * @err: error bits | |
166 | * | |
167 | * Clean up after success/failure of an explicit drive command. | |
168 | * These get thrown onto the queue so they are synchronized with | |
169 | * real I/O operations on the drive. | |
170 | * | |
171 | * In LBA48 mode we have to read the register set twice to get | |
172 | * all the extra information out. | |
173 | */ | |
174 | ||
175 | void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err) | |
176 | { | |
b65fac32 BZ |
177 | ide_hwif_t *hwif = drive->hwif; |
178 | struct request *rq = hwif->rq; | |
1da177e4 | 179 | |
7267c337 | 180 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
395d8ef5 BZ |
181 | ide_task_t *task = (ide_task_t *)rq->special; |
182 | ||
e120237c BZ |
183 | if (task) |
184 | ide_complete_task(drive, task, stat, err); | |
1da177e4 | 185 | } else if (blk_pm_request(rq)) { |
3616b653 | 186 | ide_complete_pm_rq(drive, rq); |
1da177e4 LT |
187 | return; |
188 | } | |
189 | ||
b65fac32 | 190 | hwif->rq = NULL; |
1d0bf587 | 191 | |
1da177e4 | 192 | rq->errors = err; |
1d0bf587 | 193 | |
3c8a2cce BZ |
194 | if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0), |
195 | blk_rq_bytes(rq)))) | |
5e36bb6e | 196 | BUG(); |
1da177e4 | 197 | } |
1da177e4 LT |
198 | EXPORT_SYMBOL(ide_end_drive_cmd); |
199 | ||
327fa1c2 | 200 | void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
1da177e4 LT |
201 | { |
202 | if (rq->rq_disk) { | |
7f3c868b | 203 | struct ide_driver *drv; |
1da177e4 | 204 | |
7f3c868b | 205 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
1da177e4 LT |
206 | drv->end_request(drive, 0, 0); |
207 | } else | |
208 | ide_end_request(drive, 0, 0); | |
209 | } | |
210 | ||
57d7366b | 211 | static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 212 | { |
57d7366b BZ |
213 | tf->nsect = drive->sect; |
214 | tf->lbal = drive->sect; | |
215 | tf->lbam = drive->cyl; | |
216 | tf->lbah = drive->cyl >> 8; | |
7f612f27 | 217 | tf->device = (drive->head - 1) | drive->select; |
aaaade3f | 218 | tf->command = ATA_CMD_INIT_DEV_PARAMS; |
1da177e4 LT |
219 | } |
220 | ||
57d7366b | 221 | static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 222 | { |
57d7366b | 223 | tf->nsect = drive->sect; |
aaaade3f | 224 | tf->command = ATA_CMD_RESTORE; |
1da177e4 LT |
225 | } |
226 | ||
57d7366b | 227 | static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
1da177e4 | 228 | { |
57d7366b | 229 | tf->nsect = drive->mult_req; |
aaaade3f | 230 | tf->command = ATA_CMD_SET_MULTI; |
1da177e4 LT |
231 | } |
232 | ||
233 | static ide_startstop_t ide_disk_special(ide_drive_t *drive) | |
234 | { | |
235 | special_t *s = &drive->special; | |
236 | ide_task_t args; | |
237 | ||
238 | memset(&args, 0, sizeof(ide_task_t)); | |
ac026ff2 | 239 | args.data_phase = TASKFILE_NO_DATA; |
1da177e4 LT |
240 | |
241 | if (s->b.set_geometry) { | |
242 | s->b.set_geometry = 0; | |
57d7366b | 243 | ide_tf_set_specify_cmd(drive, &args.tf); |
1da177e4 LT |
244 | } else if (s->b.recalibrate) { |
245 | s->b.recalibrate = 0; | |
57d7366b | 246 | ide_tf_set_restore_cmd(drive, &args.tf); |
1da177e4 LT |
247 | } else if (s->b.set_multmode) { |
248 | s->b.set_multmode = 0; | |
57d7366b | 249 | ide_tf_set_setmult_cmd(drive, &args.tf); |
1da177e4 LT |
250 | } else if (s->all) { |
251 | int special = s->all; | |
252 | s->all = 0; | |
253 | printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special); | |
254 | return ide_stopped; | |
255 | } | |
256 | ||
657cc1a8 | 257 | args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE | |
57d7366b | 258 | IDE_TFLAG_CUSTOM_HANDLER; |
74095a91 | 259 | |
1da177e4 LT |
260 | do_rw_taskfile(drive, &args); |
261 | ||
262 | return ide_started; | |
263 | } | |
264 | ||
265 | /** | |
266 | * do_special - issue some special commands | |
267 | * @drive: drive the command is for | |
268 | * | |
aaaade3f BZ |
269 | * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
270 | * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. | |
271 | * | |
272 | * It used to do much more, but has been scaled back. | |
1da177e4 LT |
273 | */ |
274 | ||
275 | static ide_startstop_t do_special (ide_drive_t *drive) | |
276 | { | |
277 | special_t *s = &drive->special; | |
278 | ||
279 | #ifdef DEBUG | |
280 | printk("%s: do_special: 0x%02x\n", drive->name, s->all); | |
281 | #endif | |
6982daf7 BZ |
282 | if (drive->media == ide_disk) |
283 | return ide_disk_special(drive); | |
1da177e4 | 284 | |
6982daf7 BZ |
285 | s->all = 0; |
286 | drive->mult_req = 0; | |
287 | return ide_stopped; | |
1da177e4 LT |
288 | } |
289 | ||
290 | void ide_map_sg(ide_drive_t *drive, struct request *rq) | |
291 | { | |
292 | ide_hwif_t *hwif = drive->hwif; | |
293 | struct scatterlist *sg = hwif->sg_table; | |
294 | ||
9e772d01 | 295 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { |
1da177e4 LT |
296 | sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE); |
297 | hwif->sg_nents = 1; | |
9e772d01 BP |
298 | } else if (!rq->bio) { |
299 | sg_init_one(sg, rq->data, rq->data_len); | |
300 | hwif->sg_nents = 1; | |
301 | } else { | |
302 | hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg); | |
1da177e4 LT |
303 | } |
304 | } | |
305 | ||
306 | EXPORT_SYMBOL_GPL(ide_map_sg); | |
307 | ||
308 | void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq) | |
309 | { | |
310 | ide_hwif_t *hwif = drive->hwif; | |
311 | ||
312 | hwif->nsect = hwif->nleft = rq->nr_sectors; | |
55c16a70 JA |
313 | hwif->cursg_ofs = 0; |
314 | hwif->cursg = NULL; | |
1da177e4 LT |
315 | } |
316 | ||
317 | EXPORT_SYMBOL_GPL(ide_init_sg_cmd); | |
318 | ||
319 | /** | |
320 | * execute_drive_command - issue special drive command | |
338cec32 | 321 | * @drive: the drive to issue the command on |
1da177e4 LT |
322 | * @rq: the request structure holding the command |
323 | * | |
324 | * execute_drive_cmd() issues a special drive command, usually | |
325 | * initiated by ioctl() from the external hdparm program. The | |
326 | * command can be a drive command, drive task or taskfile | |
327 | * operation. Weirdly you can call it with NULL to wait for | |
328 | * all commands to finish. Don't do this as that is due to change | |
329 | */ | |
330 | ||
331 | static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, | |
332 | struct request *rq) | |
333 | { | |
898ec223 | 334 | ide_hwif_t *hwif = drive->hwif; |
7267c337 | 335 | ide_task_t *task = rq->special; |
1da177e4 | 336 | |
7267c337 | 337 | if (task) { |
21d535c9 | 338 | hwif->data_phase = task->data_phase; |
1da177e4 LT |
339 | |
340 | switch (hwif->data_phase) { | |
341 | case TASKFILE_MULTI_OUT: | |
342 | case TASKFILE_OUT: | |
343 | case TASKFILE_MULTI_IN: | |
344 | case TASKFILE_IN: | |
345 | ide_init_sg_cmd(drive, rq); | |
346 | ide_map_sg(drive, rq); | |
347 | default: | |
348 | break; | |
349 | } | |
74095a91 | 350 | |
21d535c9 BZ |
351 | return do_rw_taskfile(drive, task); |
352 | } | |
353 | ||
1da177e4 LT |
354 | /* |
355 | * NULL is actually a valid way of waiting for | |
356 | * all current requests to be flushed from the queue. | |
357 | */ | |
358 | #ifdef DEBUG | |
359 | printk("%s: DRIVE_CMD (null)\n", drive->name); | |
360 | #endif | |
374e042c | 361 | ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif), |
b73c7ee2 | 362 | ide_read_error(drive)); |
64a57fe4 | 363 | |
1da177e4 | 364 | return ide_stopped; |
1bc6daae BZ |
365 | } |
366 | ||
79e36a9f EO |
367 | static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
368 | { | |
4abdc6ee EO |
369 | u8 cmd = rq->cmd[0]; |
370 | ||
4abdc6ee | 371 | switch (cmd) { |
1bc6daae BZ |
372 | case REQ_PARK_HEADS: |
373 | case REQ_UNPARK_HEADS: | |
374 | return ide_do_park_unpark(drive, rq); | |
92f1f8fd | 375 | case REQ_DEVSET_EXEC: |
1bc6daae | 376 | return ide_do_devset(drive, rq); |
79e36a9f EO |
377 | case REQ_DRIVE_RESET: |
378 | return ide_do_reset(drive); | |
379 | default: | |
380 | blk_dump_rq_flags(rq, "ide_special_rq - bad request"); | |
381 | ide_end_request(drive, 0, 0); | |
382 | return ide_stopped; | |
383 | } | |
384 | } | |
385 | ||
1da177e4 LT |
386 | /** |
387 | * start_request - start of I/O and command issuing for IDE | |
388 | * | |
389 | * start_request() initiates handling of a new I/O request. It | |
3c619ffd | 390 | * accepts commands and I/O (read/write) requests. |
1da177e4 LT |
391 | * |
392 | * FIXME: this function needs a rename | |
393 | */ | |
394 | ||
395 | static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) | |
396 | { | |
397 | ide_startstop_t startstop; | |
1da177e4 | 398 | |
4aff5e23 | 399 | BUG_ON(!blk_rq_started(rq)); |
1da177e4 LT |
400 | |
401 | #ifdef DEBUG | |
402 | printk("%s: start_request: current=0x%08lx\n", | |
898ec223 | 403 | drive->hwif->name, (unsigned long) rq); |
1da177e4 LT |
404 | #endif |
405 | ||
406 | /* bail early if we've exceeded max_failures */ | |
407 | if (drive->max_failures && (drive->failures > drive->max_failures)) { | |
b5e1a4e2 | 408 | rq->cmd_flags |= REQ_FAILED; |
1da177e4 LT |
409 | goto kill_rq; |
410 | } | |
411 | ||
ad3cadda JA |
412 | if (blk_pm_request(rq)) |
413 | ide_check_pm_state(drive, rq); | |
1da177e4 LT |
414 | |
415 | SELECT_DRIVE(drive); | |
3a7d2484 BZ |
416 | if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
417 | ATA_BUSY | ATA_DRQ, WAIT_READY)) { | |
1da177e4 LT |
418 | printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
419 | return startstop; | |
420 | } | |
421 | if (!drive->special.all) { | |
7f3c868b | 422 | struct ide_driver *drv; |
1da177e4 | 423 | |
513daadd SS |
424 | /* |
425 | * We reset the drive so we need to issue a SETFEATURES. | |
426 | * Do it _after_ do_special() restored device parameters. | |
427 | */ | |
428 | if (drive->current_speed == 0xff) | |
429 | ide_config_drive_speed(drive, drive->desired_speed); | |
430 | ||
7267c337 | 431 | if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) |
1da177e4 LT |
432 | return execute_drive_cmd(drive, rq); |
433 | else if (blk_pm_request(rq)) { | |
c00895ab | 434 | struct request_pm_state *pm = rq->data; |
1da177e4 LT |
435 | #ifdef DEBUG_PM |
436 | printk("%s: start_power_step(step: %d)\n", | |
6b7d8fc3 | 437 | drive->name, pm->pm_step); |
1da177e4 LT |
438 | #endif |
439 | startstop = ide_start_power_step(drive, rq); | |
440 | if (startstop == ide_stopped && | |
0d346ba0 | 441 | pm->pm_step == IDE_PM_COMPLETED) |
3616b653 | 442 | ide_complete_pm_rq(drive, rq); |
1da177e4 | 443 | return startstop; |
79e36a9f EO |
444 | } else if (!rq->rq_disk && blk_special_request(rq)) |
445 | /* | |
446 | * TODO: Once all ULDs have been modified to | |
447 | * check for specific op codes rather than | |
448 | * blindly accepting any special request, the | |
449 | * check for ->rq_disk above may be replaced | |
450 | * by a more suitable mechanism or even | |
451 | * dropped entirely. | |
452 | */ | |
453 | return ide_special_rq(drive, rq); | |
1da177e4 | 454 | |
7f3c868b | 455 | drv = *(struct ide_driver **)rq->rq_disk->private_data; |
3c619ffd BZ |
456 | |
457 | return drv->do_request(drive, rq, rq->sector); | |
1da177e4 LT |
458 | } |
459 | return do_special(drive); | |
460 | kill_rq: | |
461 | ide_kill_rq(drive, rq); | |
462 | return ide_stopped; | |
463 | } | |
464 | ||
465 | /** | |
466 | * ide_stall_queue - pause an IDE device | |
467 | * @drive: drive to stall | |
468 | * @timeout: time to stall for (jiffies) | |
469 | * | |
470 | * ide_stall_queue() can be used by a drive to give excess bandwidth back | |
b65fac32 | 471 | * to the port by sleeping for timeout jiffies. |
1da177e4 LT |
472 | */ |
473 | ||
474 | void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) | |
475 | { | |
476 | if (timeout > WAIT_WORSTCASE) | |
477 | timeout = WAIT_WORSTCASE; | |
478 | drive->sleep = timeout + jiffies; | |
97100fc8 | 479 | drive->dev_flags |= IDE_DFLAG_SLEEPING; |
1da177e4 | 480 | } |
1da177e4 LT |
481 | EXPORT_SYMBOL(ide_stall_queue); |
482 | ||
5b31f855 BZ |
483 | static inline int ide_lock_port(ide_hwif_t *hwif) |
484 | { | |
485 | if (hwif->busy) | |
486 | return 1; | |
487 | ||
488 | hwif->busy = 1; | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | static inline void ide_unlock_port(ide_hwif_t *hwif) | |
494 | { | |
495 | hwif->busy = 0; | |
496 | } | |
497 | ||
498 | static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) | |
499 | { | |
500 | int rc = 0; | |
501 | ||
502 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
503 | rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); | |
504 | if (rc == 0) { | |
e354c1d8 BZ |
505 | if (host->get_lock) |
506 | host->get_lock(ide_intr, hwif); | |
5b31f855 BZ |
507 | } |
508 | } | |
509 | return rc; | |
510 | } | |
511 | ||
512 | static inline void ide_unlock_host(struct ide_host *host) | |
513 | { | |
514 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { | |
e354c1d8 BZ |
515 | if (host->release_lock) |
516 | host->release_lock(); | |
5b31f855 BZ |
517 | clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
518 | } | |
519 | } | |
520 | ||
1da177e4 | 521 | /* |
b65fac32 | 522 | * Issue a new request to a device. |
1da177e4 | 523 | */ |
295f0004 | 524 | void do_ide_request(struct request_queue *q) |
1da177e4 | 525 | { |
201bffa4 BZ |
526 | ide_drive_t *drive = q->queuedata; |
527 | ide_hwif_t *hwif = drive->hwif; | |
5b31f855 | 528 | struct ide_host *host = hwif->host; |
5b31f855 | 529 | struct request *rq = NULL; |
1da177e4 LT |
530 | ide_startstop_t startstop; |
531 | ||
201bffa4 BZ |
532 | /* |
533 | * drive is doing pre-flush, ordered write, post-flush sequence. even | |
534 | * though that is 3 requests, it must be seen as a single transaction. | |
535 | * we must not preempt this drive until that is complete | |
536 | */ | |
537 | if (blk_queue_flushing(q)) | |
1da177e4 | 538 | /* |
201bffa4 BZ |
539 | * small race where queue could get replugged during |
540 | * the 3-request flush cycle, just yank the plug since | |
541 | * we want it to finish asap | |
1da177e4 | 542 | */ |
201bffa4 | 543 | blk_remove_plug(q); |
1da177e4 | 544 | |
201bffa4 | 545 | spin_unlock_irq(q->queue_lock); |
5b31f855 BZ |
546 | |
547 | if (ide_lock_host(host, hwif)) | |
548 | goto plug_device_2; | |
549 | ||
b65fac32 | 550 | spin_lock_irq(&hwif->lock); |
295f0004 | 551 | |
5b31f855 | 552 | if (!ide_lock_port(hwif)) { |
42cf2611 | 553 | ide_hwif_t *prev_port; |
201bffa4 | 554 | repeat: |
bd53cbcc | 555 | prev_port = hwif->host->cur_port; |
b65fac32 | 556 | hwif->rq = NULL; |
2fb21150 | 557 | |
201bffa4 BZ |
558 | if (drive->dev_flags & IDE_DFLAG_SLEEPING) { |
559 | if (time_before(drive->sleep, jiffies)) { | |
5b31f855 | 560 | ide_unlock_port(hwif); |
201bffa4 BZ |
561 | goto plug_device; |
562 | } | |
563 | } | |
295f0004 | 564 | |
bd53cbcc BZ |
565 | if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
566 | hwif != prev_port) { | |
7299a391 | 567 | /* |
42cf2611 | 568 | * set nIEN for previous port, drives in the |
7299a391 BZ |
569 | * quirk_list may not like intr setups/cleanups |
570 | */ | |
b65fac32 | 571 | if (prev_port && prev_port->cur_dev->quirk_list == 0) |
42cf2611 | 572 | prev_port->tp_ops->set_irq(prev_port, 0); |
bd53cbcc BZ |
573 | |
574 | hwif->host->cur_port = hwif; | |
1da177e4 | 575 | } |
b65fac32 | 576 | hwif->cur_dev = drive; |
4abdc6ee | 577 | drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
1da177e4 | 578 | |
b65fac32 | 579 | spin_unlock_irq(&hwif->lock); |
201bffa4 | 580 | spin_lock_irq(q->queue_lock); |
1da177e4 LT |
581 | /* |
582 | * we know that the queue isn't empty, but this can happen | |
583 | * if the q->prep_rq_fn() decides to kill a request | |
584 | */ | |
585 | rq = elv_next_request(drive->queue); | |
201bffa4 | 586 | spin_unlock_irq(q->queue_lock); |
b65fac32 | 587 | spin_lock_irq(&hwif->lock); |
201bffa4 | 588 | |
1da177e4 | 589 | if (!rq) { |
5b31f855 | 590 | ide_unlock_port(hwif); |
201bffa4 | 591 | goto out; |
1da177e4 LT |
592 | } |
593 | ||
594 | /* | |
595 | * Sanity: don't accept a request that isn't a PM request | |
596 | * if we are currently power managed. This is very important as | |
597 | * blk_stop_queue() doesn't prevent the elv_next_request() | |
598 | * above to return us whatever is in the queue. Since we call | |
599 | * ide_do_request() ourselves, we end up taking requests while | |
600 | * the queue is blocked... | |
601 | * | |
602 | * We let requests forced at head of queue with ide-preempt | |
603 | * though. I hope that doesn't happen too much, hopefully not | |
604 | * unless the subdriver triggers such a thing in its own PM | |
605 | * state machine. | |
606 | */ | |
97100fc8 BZ |
607 | if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
608 | blk_pm_request(rq) == 0 && | |
609 | (rq->cmd_flags & REQ_PREEMPT) == 0) { | |
631de370 | 610 | /* there should be no pending command at this point */ |
5b31f855 | 611 | ide_unlock_port(hwif); |
295f0004 | 612 | goto plug_device; |
1da177e4 LT |
613 | } |
614 | ||
b65fac32 | 615 | hwif->rq = rq; |
1da177e4 | 616 | |
b65fac32 | 617 | spin_unlock_irq(&hwif->lock); |
1da177e4 | 618 | startstop = start_request(drive, rq); |
b65fac32 | 619 | spin_lock_irq(&hwif->lock); |
295f0004 | 620 | |
201bffa4 BZ |
621 | if (startstop == ide_stopped) |
622 | goto repeat; | |
623 | } else | |
624 | goto plug_device; | |
625 | out: | |
b65fac32 | 626 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
627 | if (rq == NULL) |
628 | ide_unlock_host(host); | |
201bffa4 | 629 | spin_lock_irq(q->queue_lock); |
295f0004 | 630 | return; |
1da177e4 | 631 | |
295f0004 | 632 | plug_device: |
b65fac32 | 633 | spin_unlock_irq(&hwif->lock); |
5b31f855 BZ |
634 | ide_unlock_host(host); |
635 | plug_device_2: | |
201bffa4 BZ |
636 | spin_lock_irq(q->queue_lock); |
637 | ||
638 | if (!elv_queue_empty(q)) | |
639 | blk_plug_device(q); | |
1da177e4 LT |
640 | } |
641 | ||
201bffa4 BZ |
642 | static void ide_plug_device(ide_drive_t *drive) |
643 | { | |
644 | struct request_queue *q = drive->queue; | |
645 | unsigned long flags; | |
646 | ||
647 | spin_lock_irqsave(q->queue_lock, flags); | |
648 | if (!elv_queue_empty(q)) | |
649 | blk_plug_device(q); | |
650 | spin_unlock_irqrestore(q->queue_lock, flags); | |
651 | } | |
652 | ||
b6a45a0b BZ |
653 | static int drive_is_ready(ide_drive_t *drive) |
654 | { | |
655 | ide_hwif_t *hwif = drive->hwif; | |
656 | u8 stat = 0; | |
657 | ||
658 | if (drive->waiting_for_dma) | |
659 | return hwif->dma_ops->dma_test_irq(drive); | |
660 | ||
661 | if (hwif->io_ports.ctl_addr && | |
662 | (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) | |
663 | stat = hwif->tp_ops->read_altstatus(hwif); | |
664 | else | |
665 | /* Note: this may clear a pending IRQ!! */ | |
666 | stat = hwif->tp_ops->read_status(hwif); | |
667 | ||
668 | if (stat & ATA_BUSY) | |
669 | /* drive busy: definitely not interrupting */ | |
670 | return 0; | |
671 | ||
672 | /* drive ready: *might* be interrupting */ | |
673 | return 1; | |
674 | } | |
675 | ||
1da177e4 LT |
676 | /** |
677 | * ide_timer_expiry - handle lack of an IDE interrupt | |
b65fac32 | 678 | * @data: timer callback magic (hwif) |
1da177e4 LT |
679 | * |
680 | * An IDE command has timed out before the expected drive return | |
681 | * occurred. At this point we attempt to clean up the current | |
682 | * mess. If the current handler includes an expiry handler then | |
683 | * we invoke the expiry handler, and providing it is happy the | |
684 | * work is done. If that fails we apply generic recovery rules | |
685 | * invoking the handler and checking the drive DMA status. We | |
686 | * have an excessively incestuous relationship with the DMA | |
687 | * logic that wants cleaning up. | |
688 | */ | |
689 | ||
690 | void ide_timer_expiry (unsigned long data) | |
691 | { | |
b65fac32 | 692 | ide_hwif_t *hwif = (ide_hwif_t *)data; |
201bffa4 | 693 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 694 | ide_handler_t *handler; |
1da177e4 | 695 | unsigned long flags; |
e0c6dcd8 | 696 | int wait = -1; |
201bffa4 | 697 | int plug_device = 0; |
1da177e4 | 698 | |
b65fac32 BZ |
699 | spin_lock_irqsave(&hwif->lock, flags); |
700 | ||
701 | handler = hwif->handler; | |
1da177e4 | 702 | |
b65fac32 | 703 | if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
1da177e4 LT |
704 | /* |
705 | * Either a marginal timeout occurred | |
706 | * (got the interrupt just as timer expired), | |
707 | * or we were "sleeping" to give other devices a chance. | |
708 | * Either way, we don't really want to complain about anything. | |
709 | */ | |
1da177e4 | 710 | } else { |
c38714ed BZ |
711 | ide_expiry_t *expiry = hwif->expiry; |
712 | ide_startstop_t startstop = ide_stopped; | |
713 | ||
b65fac32 | 714 | drive = hwif->cur_dev; |
c38714ed BZ |
715 | |
716 | if (expiry) { | |
717 | wait = expiry(drive); | |
718 | if (wait > 0) { /* continue */ | |
719 | /* reset timer */ | |
720 | hwif->timer.expires = jiffies + wait; | |
721 | hwif->req_gen_timer = hwif->req_gen; | |
722 | add_timer(&hwif->timer); | |
723 | spin_unlock_irqrestore(&hwif->lock, flags); | |
724 | return; | |
295f0004 | 725 | } |
1da177e4 | 726 | } |
c38714ed BZ |
727 | hwif->handler = NULL; |
728 | /* | |
729 | * We need to simulate a real interrupt when invoking | |
730 | * the handler() function, which means we need to | |
731 | * globally mask the specific IRQ: | |
732 | */ | |
733 | spin_unlock(&hwif->lock); | |
734 | /* disable_irq_nosync ?? */ | |
735 | disable_irq(hwif->irq); | |
736 | /* local CPU only, as if we were handling an interrupt */ | |
737 | local_irq_disable(); | |
738 | if (hwif->polling) { | |
739 | startstop = handler(drive); | |
740 | } else if (drive_is_ready(drive)) { | |
741 | if (drive->waiting_for_dma) | |
742 | hwif->dma_ops->dma_lost_irq(drive); | |
d15a613b BZ |
743 | if (hwif->ack_intr) |
744 | hwif->ack_intr(hwif); | |
c38714ed BZ |
745 | printk(KERN_WARNING "%s: lost interrupt\n", |
746 | drive->name); | |
747 | startstop = handler(drive); | |
748 | } else { | |
749 | if (drive->waiting_for_dma) | |
750 | startstop = ide_dma_timeout_retry(drive, wait); | |
751 | else | |
752 | startstop = ide_error(drive, "irq timeout", | |
753 | hwif->tp_ops->read_status(hwif)); | |
754 | } | |
755 | spin_lock_irq(&hwif->lock); | |
756 | enable_irq(hwif->irq); | |
757 | if (startstop == ide_stopped) { | |
758 | ide_unlock_port(hwif); | |
759 | plug_device = 1; | |
760 | } | |
1da177e4 | 761 | } |
b65fac32 | 762 | spin_unlock_irqrestore(&hwif->lock, flags); |
201bffa4 | 763 | |
5b31f855 BZ |
764 | if (plug_device) { |
765 | ide_unlock_host(hwif->host); | |
201bffa4 | 766 | ide_plug_device(drive); |
5b31f855 | 767 | } |
1da177e4 LT |
768 | } |
769 | ||
770 | /** | |
771 | * unexpected_intr - handle an unexpected IDE interrupt | |
772 | * @irq: interrupt line | |
bd53cbcc | 773 | * @hwif: port being processed |
1da177e4 LT |
774 | * |
775 | * There's nothing really useful we can do with an unexpected interrupt, | |
776 | * other than reading the status register (to clear it), and logging it. | |
777 | * There should be no way that an irq can happen before we're ready for it, | |
778 | * so we needn't worry much about losing an "important" interrupt here. | |
779 | * | |
780 | * On laptops (and "green" PCs), an unexpected interrupt occurs whenever | |
781 | * the drive enters "idle", "standby", or "sleep" mode, so if the status | |
782 | * looks "good", we just ignore the interrupt completely. | |
783 | * | |
784 | * This routine assumes __cli() is in effect when called. | |
785 | * | |
786 | * If an unexpected interrupt happens on irq15 while we are handling irq14 | |
787 | * and if the two interfaces are "serialized" (CMD640), then it looks like | |
788 | * we could screw up by interfering with a new request being set up for | |
789 | * irq15. | |
790 | * | |
791 | * In reality, this is a non-issue. The new command is not sent unless | |
792 | * the drive is ready to accept one, in which case we know the drive is | |
793 | * not trying to interrupt us. And ide_set_handler() is always invoked | |
794 | * before completing the issuance of any new drive command, so we will not | |
795 | * be accidentally invoked as a result of any valid command completion | |
796 | * interrupt. | |
1da177e4 | 797 | */ |
bd53cbcc BZ |
798 | |
799 | static void unexpected_intr(int irq, ide_hwif_t *hwif) | |
1da177e4 | 800 | { |
ae86afae BZ |
801 | u8 stat = hwif->tp_ops->read_status(hwif); |
802 | ||
803 | if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) { | |
804 | /* Try to not flood the console with msgs */ | |
805 | static unsigned long last_msgtime, count; | |
806 | ++count; | |
807 | ||
808 | if (time_after(jiffies, last_msgtime + HZ)) { | |
809 | last_msgtime = jiffies; | |
810 | printk(KERN_ERR "%s: unexpected interrupt, " | |
811 | "status=0x%02x, count=%ld\n", | |
812 | hwif->name, stat, count); | |
1da177e4 | 813 | } |
ae86afae | 814 | } |
1da177e4 LT |
815 | } |
816 | ||
817 | /** | |
818 | * ide_intr - default IDE interrupt handler | |
819 | * @irq: interrupt number | |
ae86afae | 820 | * @dev_id: hwif |
1da177e4 LT |
821 | * @regs: unused weirdness from the kernel irq layer |
822 | * | |
823 | * This is the default IRQ handler for the IDE layer. You should | |
824 | * not need to override it. If you do be aware it is subtle in | |
825 | * places | |
826 | * | |
bd53cbcc | 827 | * hwif is the interface in the group currently performing |
b65fac32 | 828 | * a command. hwif->cur_dev is the drive and hwif->handler is |
1da177e4 LT |
829 | * the IRQ handler to call. As we issue a command the handlers |
830 | * step through multiple states, reassigning the handler to the | |
831 | * next step in the process. Unlike a smart SCSI controller IDE | |
832 | * expects the main processor to sequence the various transfer | |
833 | * stages. We also manage a poll timer to catch up with most | |
834 | * timeout situations. There are still a few where the handlers | |
835 | * don't ever decide to give up. | |
836 | * | |
837 | * The handler eventually returns ide_stopped to indicate the | |
838 | * request completed. At this point we issue the next request | |
b65fac32 | 839 | * on the port and the process begins again. |
1da177e4 | 840 | */ |
b65fac32 | 841 | |
7d12e780 | 842 | irqreturn_t ide_intr (int irq, void *dev_id) |
1da177e4 | 843 | { |
ae86afae | 844 | ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
255115fb | 845 | struct ide_host *host = hwif->host; |
201bffa4 | 846 | ide_drive_t *uninitialized_var(drive); |
1da177e4 | 847 | ide_handler_t *handler; |
ae86afae | 848 | unsigned long flags; |
1da177e4 | 849 | ide_startstop_t startstop; |
3e0e29f7 | 850 | irqreturn_t irq_ret = IRQ_NONE; |
201bffa4 | 851 | int plug_device = 0; |
1da177e4 | 852 | |
255115fb BZ |
853 | if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
854 | if (hwif != host->cur_port) | |
ae86afae BZ |
855 | goto out_early; |
856 | } | |
bd53cbcc | 857 | |
b65fac32 | 858 | spin_lock_irqsave(&hwif->lock, flags); |
1da177e4 | 859 | |
d15a613b | 860 | if (hwif->ack_intr && hwif->ack_intr(hwif) == 0) |
3e0e29f7 | 861 | goto out; |
1da177e4 | 862 | |
b65fac32 BZ |
863 | handler = hwif->handler; |
864 | ||
865 | if (handler == NULL || hwif->polling) { | |
1da177e4 LT |
866 | /* |
867 | * Not expecting an interrupt from this drive. | |
868 | * That means this could be: | |
869 | * (1) an interrupt from another PCI device | |
870 | * sharing the same PCI INT# as us. | |
871 | * or (2) a drive just entered sleep or standby mode, | |
872 | * and is interrupting to let us know. | |
873 | * or (3) a spurious interrupt of unknown origin. | |
874 | * | |
875 | * For PCI, we cannot tell the difference, | |
876 | * so in that case we just ignore it and hope it goes away. | |
1da177e4 | 877 | */ |
255115fb | 878 | if ((host->irq_flags & IRQF_SHARED) == 0) { |
1da177e4 LT |
879 | /* |
880 | * Probably not a shared PCI interrupt, | |
881 | * so we can safely try to do something about it: | |
882 | */ | |
bd53cbcc | 883 | unexpected_intr(irq, hwif); |
1da177e4 LT |
884 | } else { |
885 | /* | |
886 | * Whack the status register, just in case | |
887 | * we have a leftover pending IRQ. | |
888 | */ | |
374e042c | 889 | (void)hwif->tp_ops->read_status(hwif); |
1da177e4 | 890 | } |
3e0e29f7 | 891 | goto out; |
1da177e4 | 892 | } |
3e0e29f7 | 893 | |
b65fac32 | 894 | drive = hwif->cur_dev; |
3e0e29f7 BZ |
895 | |
896 | if (!drive_is_ready(drive)) | |
1da177e4 LT |
897 | /* |
898 | * This happens regularly when we share a PCI IRQ with | |
899 | * another device. Unfortunately, it can also happen | |
900 | * with some buggy drives that trigger the IRQ before | |
901 | * their status register is up to date. Hopefully we have | |
902 | * enough advance overhead that the latter isn't a problem. | |
903 | */ | |
3e0e29f7 BZ |
904 | goto out; |
905 | ||
b65fac32 BZ |
906 | hwif->handler = NULL; |
907 | hwif->req_gen++; | |
908 | del_timer(&hwif->timer); | |
909 | spin_unlock(&hwif->lock); | |
1da177e4 | 910 | |
bfa7d8e5 BZ |
911 | if (hwif->port_ops && hwif->port_ops->clear_irq) |
912 | hwif->port_ops->clear_irq(drive); | |
f0dd8712 | 913 | |
97100fc8 | 914 | if (drive->dev_flags & IDE_DFLAG_UNMASK) |
366c7f55 | 915 | local_irq_enable_in_hardirq(); |
bfa7d8e5 | 916 | |
1da177e4 LT |
917 | /* service this interrupt, may set handler for next interrupt */ |
918 | startstop = handler(drive); | |
1da177e4 | 919 | |
b65fac32 | 920 | spin_lock_irq(&hwif->lock); |
1da177e4 LT |
921 | /* |
922 | * Note that handler() may have set things up for another | |
923 | * interrupt to occur soon, but it cannot happen until | |
924 | * we exit from this routine, because it will be the | |
925 | * same irq as is currently being serviced here, and Linux | |
926 | * won't allow another of the same (on any CPU) until we return. | |
927 | */ | |
1da177e4 | 928 | if (startstop == ide_stopped) { |
9600dcf1 BZ |
929 | BUG_ON(hwif->handler); |
930 | ide_unlock_port(hwif); | |
931 | plug_device = 1; | |
1da177e4 | 932 | } |
3e0e29f7 BZ |
933 | irq_ret = IRQ_HANDLED; |
934 | out: | |
b65fac32 | 935 | spin_unlock_irqrestore(&hwif->lock, flags); |
ae86afae | 936 | out_early: |
5b31f855 BZ |
937 | if (plug_device) { |
938 | ide_unlock_host(hwif->host); | |
201bffa4 | 939 | ide_plug_device(drive); |
5b31f855 | 940 | } |
201bffa4 | 941 | |
3e0e29f7 | 942 | return irq_ret; |
1da177e4 | 943 | } |
849d7130 | 944 | EXPORT_SYMBOL_GPL(ide_intr); |
1da177e4 | 945 | |
9f87abe8 BZ |
946 | void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
947 | { | |
948 | ide_hwif_t *hwif = drive->hwif; | |
949 | u8 buf[4] = { 0 }; | |
950 | ||
951 | while (len > 0) { | |
952 | if (write) | |
374e042c | 953 | hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
9f87abe8 | 954 | else |
374e042c | 955 | hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
9f87abe8 BZ |
956 | len -= 4; |
957 | } | |
958 | } | |
959 | EXPORT_SYMBOL_GPL(ide_pad_transfer); |