ide: use per-device request queue locks (v2)
[linux-2.6-block.git] / drivers / ide / ide-io.c
CommitLineData
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 58static 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)
91 drive->hwif->hwgroup->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
107int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
108{
41e9d344 109 unsigned int nr_bytes = nr_sectors << 9;
1d0bf587 110 struct request *rq = drive->hwif->hwgroup->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}
121EXPORT_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
138int 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}
145EXPORT_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
161void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
162{
1d0bf587
BZ
163 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
164 struct request *rq = hwgroup->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)) {
c00895ab 181 struct request_pm_state *pm = rq->data;
6b7d8fc3
BZ
182
183 ide_complete_power_step(drive, rq);
0d346ba0 184 if (pm->pm_step == IDE_PM_COMPLETED)
1da177e4
LT
185 ide_complete_pm_request(drive, rq);
186 return;
187 }
188
1d0bf587
BZ
189 hwgroup->rq = NULL;
190
1da177e4 191 rq->errors = err;
1d0bf587 192
3c8a2cce
BZ
193 if (unlikely(blk_end_request(rq, (rq->errors ? -EIO : 0),
194 blk_rq_bytes(rq))))
5e36bb6e 195 BUG();
1da177e4 196}
1da177e4
LT
197EXPORT_SYMBOL(ide_end_drive_cmd);
198
1da177e4
LT
199static void ide_kill_rq(ide_drive_t *drive, struct request *rq)
200{
201 if (rq->rq_disk) {
202 ide_driver_t *drv;
203
204 drv = *(ide_driver_t **)rq->rq_disk->private_data;
205 drv->end_request(drive, 0, 0);
206 } else
207 ide_end_request(drive, 0, 0);
208}
209
210static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
211{
212 ide_hwif_t *hwif = drive->hwif;
213
97100fc8
BZ
214 if ((stat & ATA_BUSY) ||
215 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
1da177e4
LT
216 /* other bits are useless when BUSY */
217 rq->errors |= ERROR_RESET;
3a7d2484 218 } else if (stat & ATA_ERR) {
1da177e4 219 /* err has different meaning on cdrom and tape */
3a7d2484 220 if (err == ATA_ABORTED) {
d1d76714 221 if ((drive->dev_flags & IDE_DFLAG_LBA) &&
aaaade3f
BZ
222 /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
223 hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS)
1da177e4
LT
224 return ide_stopped;
225 } else if ((err & BAD_CRC) == BAD_CRC) {
226 /* UDMA crc error, just retry the operation */
227 drive->crc_count++;
3a7d2484 228 } else if (err & (ATA_BBK | ATA_UNC)) {
1da177e4
LT
229 /* retries won't help these */
230 rq->errors = ERROR_MAX;
3a7d2484 231 } else if (err & ATA_TRK0NF) {
1da177e4
LT
232 /* help it find track zero */
233 rq->errors |= ERROR_RECAL;
234 }
235 }
236
3a7d2484 237 if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ &&
57279a7a
BZ
238 (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) {
239 int nsect = drive->mult_count ? drive->mult_count : 1;
240
241 ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE);
242 }
1da177e4 243
513daadd
SS
244 if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) {
245 ide_kill_rq(drive, rq);
246 return ide_stopped;
247 }
248
3a7d2484 249 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
513daadd 250 rq->errors |= ERROR_RESET;
1da177e4 251
513daadd 252 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
1da177e4 253 ++rq->errors;
513daadd 254 return ide_do_reset(drive);
1da177e4 255 }
513daadd
SS
256
257 if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
258 drive->special.b.recalibrate = 1;
259
260 ++rq->errors;
261
1da177e4
LT
262 return ide_stopped;
263}
264
265static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
266{
267 ide_hwif_t *hwif = drive->hwif;
268
97100fc8
BZ
269 if ((stat & ATA_BUSY) ||
270 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
1da177e4
LT
271 /* other bits are useless when BUSY */
272 rq->errors |= ERROR_RESET;
273 } else {
274 /* add decoding error stuff */
275 }
276
3a7d2484 277 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
1da177e4 278 /* force an abort */
aaaade3f 279 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
1da177e4
LT
280
281 if (rq->errors >= ERROR_MAX) {
282 ide_kill_rq(drive, rq);
283 } else {
284 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
285 ++rq->errors;
286 return ide_do_reset(drive);
287 }
288 ++rq->errors;
289 }
290
291 return ide_stopped;
292}
293
294ide_startstop_t
295__ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
296{
297 if (drive->media == ide_disk)
298 return ide_ata_error(drive, rq, stat, err);
299 return ide_atapi_error(drive, rq, stat, err);
300}
301
302EXPORT_SYMBOL_GPL(__ide_error);
303
304/**
305 * ide_error - handle an error on the IDE
306 * @drive: drive the error occurred on
307 * @msg: message to report
308 * @stat: status bits
309 *
310 * ide_error() takes action based on the error returned by the drive.
311 * For normal I/O that may well include retries. We deal with
312 * both new-style (taskfile) and old style command handling here.
313 * In the case of taskfile command handling there is work left to
314 * do
315 */
316
317ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat)
318{
319 struct request *rq;
320 u8 err;
321
322 err = ide_dump_status(drive, msg, stat);
323
324 if ((rq = HWGROUP(drive)->rq) == NULL)
325 return ide_stopped;
326
327 /* retry only "normal" I/O: */
4aff5e23 328 if (!blk_fs_request(rq)) {
1da177e4
LT
329 rq->errors = 1;
330 ide_end_drive_cmd(drive, stat, err);
331 return ide_stopped;
332 }
333
334 if (rq->rq_disk) {
335 ide_driver_t *drv;
336
337 drv = *(ide_driver_t **)rq->rq_disk->private_data;
338 return drv->error(drive, rq, stat, err);
339 } else
340 return __ide_error(drive, rq, stat, err);
341}
342
343EXPORT_SYMBOL_GPL(ide_error);
344
57d7366b 345static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
1da177e4 346{
57d7366b
BZ
347 tf->nsect = drive->sect;
348 tf->lbal = drive->sect;
349 tf->lbam = drive->cyl;
350 tf->lbah = drive->cyl >> 8;
7f612f27 351 tf->device = (drive->head - 1) | drive->select;
aaaade3f 352 tf->command = ATA_CMD_INIT_DEV_PARAMS;
1da177e4
LT
353}
354
57d7366b 355static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
1da177e4 356{
57d7366b 357 tf->nsect = drive->sect;
aaaade3f 358 tf->command = ATA_CMD_RESTORE;
1da177e4
LT
359}
360
57d7366b 361static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
1da177e4 362{
57d7366b 363 tf->nsect = drive->mult_req;
aaaade3f 364 tf->command = ATA_CMD_SET_MULTI;
1da177e4
LT
365}
366
367static ide_startstop_t ide_disk_special(ide_drive_t *drive)
368{
369 special_t *s = &drive->special;
370 ide_task_t args;
371
372 memset(&args, 0, sizeof(ide_task_t));
ac026ff2 373 args.data_phase = TASKFILE_NO_DATA;
1da177e4
LT
374
375 if (s->b.set_geometry) {
376 s->b.set_geometry = 0;
57d7366b 377 ide_tf_set_specify_cmd(drive, &args.tf);
1da177e4
LT
378 } else if (s->b.recalibrate) {
379 s->b.recalibrate = 0;
57d7366b 380 ide_tf_set_restore_cmd(drive, &args.tf);
1da177e4
LT
381 } else if (s->b.set_multmode) {
382 s->b.set_multmode = 0;
57d7366b 383 ide_tf_set_setmult_cmd(drive, &args.tf);
1da177e4
LT
384 } else if (s->all) {
385 int special = s->all;
386 s->all = 0;
387 printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
388 return ide_stopped;
389 }
390
657cc1a8 391 args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE |
57d7366b 392 IDE_TFLAG_CUSTOM_HANDLER;
74095a91 393
1da177e4
LT
394 do_rw_taskfile(drive, &args);
395
396 return ide_started;
397}
398
399/**
400 * do_special - issue some special commands
401 * @drive: drive the command is for
402 *
aaaade3f
BZ
403 * do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS,
404 * ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive.
405 *
406 * It used to do much more, but has been scaled back.
1da177e4
LT
407 */
408
409static ide_startstop_t do_special (ide_drive_t *drive)
410{
411 special_t *s = &drive->special;
412
413#ifdef DEBUG
414 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
415#endif
6982daf7
BZ
416 if (drive->media == ide_disk)
417 return ide_disk_special(drive);
1da177e4 418
6982daf7
BZ
419 s->all = 0;
420 drive->mult_req = 0;
421 return ide_stopped;
1da177e4
LT
422}
423
424void ide_map_sg(ide_drive_t *drive, struct request *rq)
425{
426 ide_hwif_t *hwif = drive->hwif;
427 struct scatterlist *sg = hwif->sg_table;
428
429 if (hwif->sg_mapped) /* needed by ide-scsi */
430 return;
431
4aff5e23 432 if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) {
1da177e4
LT
433 hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
434 } else {
435 sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
436 hwif->sg_nents = 1;
437 }
438}
439
440EXPORT_SYMBOL_GPL(ide_map_sg);
441
442void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq)
443{
444 ide_hwif_t *hwif = drive->hwif;
445
446 hwif->nsect = hwif->nleft = rq->nr_sectors;
55c16a70
JA
447 hwif->cursg_ofs = 0;
448 hwif->cursg = NULL;
1da177e4
LT
449}
450
451EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
452
453/**
454 * execute_drive_command - issue special drive command
338cec32 455 * @drive: the drive to issue the command on
1da177e4
LT
456 * @rq: the request structure holding the command
457 *
458 * execute_drive_cmd() issues a special drive command, usually
459 * initiated by ioctl() from the external hdparm program. The
460 * command can be a drive command, drive task or taskfile
461 * operation. Weirdly you can call it with NULL to wait for
462 * all commands to finish. Don't do this as that is due to change
463 */
464
465static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
466 struct request *rq)
467{
468 ide_hwif_t *hwif = HWIF(drive);
7267c337 469 ide_task_t *task = rq->special;
1da177e4 470
7267c337 471 if (task) {
21d535c9 472 hwif->data_phase = task->data_phase;
1da177e4
LT
473
474 switch (hwif->data_phase) {
475 case TASKFILE_MULTI_OUT:
476 case TASKFILE_OUT:
477 case TASKFILE_MULTI_IN:
478 case TASKFILE_IN:
479 ide_init_sg_cmd(drive, rq);
480 ide_map_sg(drive, rq);
481 default:
482 break;
483 }
74095a91 484
21d535c9
BZ
485 return do_rw_taskfile(drive, task);
486 }
487
1da177e4
LT
488 /*
489 * NULL is actually a valid way of waiting for
490 * all current requests to be flushed from the queue.
491 */
492#ifdef DEBUG
493 printk("%s: DRIVE_CMD (null)\n", drive->name);
494#endif
374e042c 495 ide_end_drive_cmd(drive, hwif->tp_ops->read_status(hwif),
b73c7ee2 496 ide_read_error(drive));
64a57fe4 497
1da177e4
LT
498 return ide_stopped;
499}
500
92f1f8fd
EO
501int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
502 int arg)
503{
504 struct request_queue *q = drive->queue;
505 struct request *rq;
506 int ret = 0;
507
508 if (!(setting->flags & DS_SYNC))
509 return setting->set(drive, arg);
510
e415e495 511 rq = blk_get_request(q, READ, __GFP_WAIT);
92f1f8fd
EO
512 rq->cmd_type = REQ_TYPE_SPECIAL;
513 rq->cmd_len = 5;
514 rq->cmd[0] = REQ_DEVSET_EXEC;
515 *(int *)&rq->cmd[1] = arg;
516 rq->special = setting->set;
517
518 if (blk_execute_rq(q, NULL, rq, 0))
519 ret = rq->errors;
520 blk_put_request(rq);
521
522 return ret;
523}
524EXPORT_SYMBOL_GPL(ide_devset_execute);
525
79e36a9f
EO
526static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq)
527{
4abdc6ee
EO
528 u8 cmd = rq->cmd[0];
529
530 if (cmd == REQ_PARK_HEADS || cmd == REQ_UNPARK_HEADS) {
531 ide_task_t task;
532 struct ide_taskfile *tf = &task.tf;
533
534 memset(&task, 0, sizeof(task));
535 if (cmd == REQ_PARK_HEADS) {
536 drive->sleep = *(unsigned long *)rq->special;
537 drive->dev_flags |= IDE_DFLAG_SLEEPING;
538 tf->command = ATA_CMD_IDLEIMMEDIATE;
539 tf->feature = 0x44;
540 tf->lbal = 0x4c;
541 tf->lbam = 0x4e;
542 tf->lbah = 0x55;
543 task.tf_flags |= IDE_TFLAG_CUSTOM_HANDLER;
544 } else /* cmd == REQ_UNPARK_HEADS */
545 tf->command = ATA_CMD_CHK_POWER;
546
547 task.tf_flags |= IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
548 task.rq = rq;
549 drive->hwif->data_phase = task.data_phase = TASKFILE_NO_DATA;
550 return do_rw_taskfile(drive, &task);
551 }
552
553 switch (cmd) {
92f1f8fd
EO
554 case REQ_DEVSET_EXEC:
555 {
556 int err, (*setfunc)(ide_drive_t *, int) = rq->special;
557
558 err = setfunc(drive, *(int *)&rq->cmd[1]);
559 if (err)
560 rq->errors = err;
561 else
562 err = 1;
563 ide_end_request(drive, err, 0);
564 return ide_stopped;
565 }
79e36a9f
EO
566 case REQ_DRIVE_RESET:
567 return ide_do_reset(drive);
568 default:
569 blk_dump_rq_flags(rq, "ide_special_rq - bad request");
570 ide_end_request(drive, 0, 0);
571 return ide_stopped;
572 }
573}
574
1da177e4
LT
575/**
576 * start_request - start of I/O and command issuing for IDE
577 *
578 * start_request() initiates handling of a new I/O request. It
3c619ffd 579 * accepts commands and I/O (read/write) requests.
1da177e4
LT
580 *
581 * FIXME: this function needs a rename
582 */
583
584static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
585{
586 ide_startstop_t startstop;
1da177e4 587
4aff5e23 588 BUG_ON(!blk_rq_started(rq));
1da177e4
LT
589
590#ifdef DEBUG
591 printk("%s: start_request: current=0x%08lx\n",
592 HWIF(drive)->name, (unsigned long) rq);
593#endif
594
595 /* bail early if we've exceeded max_failures */
596 if (drive->max_failures && (drive->failures > drive->max_failures)) {
b5e1a4e2 597 rq->cmd_flags |= REQ_FAILED;
1da177e4
LT
598 goto kill_rq;
599 }
600
ad3cadda
JA
601 if (blk_pm_request(rq))
602 ide_check_pm_state(drive, rq);
1da177e4
LT
603
604 SELECT_DRIVE(drive);
3a7d2484
BZ
605 if (ide_wait_stat(&startstop, drive, drive->ready_stat,
606 ATA_BUSY | ATA_DRQ, WAIT_READY)) {
1da177e4
LT
607 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
608 return startstop;
609 }
610 if (!drive->special.all) {
611 ide_driver_t *drv;
612
513daadd
SS
613 /*
614 * We reset the drive so we need to issue a SETFEATURES.
615 * Do it _after_ do_special() restored device parameters.
616 */
617 if (drive->current_speed == 0xff)
618 ide_config_drive_speed(drive, drive->desired_speed);
619
7267c337 620 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
1da177e4
LT
621 return execute_drive_cmd(drive, rq);
622 else if (blk_pm_request(rq)) {
c00895ab 623 struct request_pm_state *pm = rq->data;
1da177e4
LT
624#ifdef DEBUG_PM
625 printk("%s: start_power_step(step: %d)\n",
6b7d8fc3 626 drive->name, pm->pm_step);
1da177e4
LT
627#endif
628 startstop = ide_start_power_step(drive, rq);
629 if (startstop == ide_stopped &&
0d346ba0 630 pm->pm_step == IDE_PM_COMPLETED)
1da177e4
LT
631 ide_complete_pm_request(drive, rq);
632 return startstop;
79e36a9f
EO
633 } else if (!rq->rq_disk && blk_special_request(rq))
634 /*
635 * TODO: Once all ULDs have been modified to
636 * check for specific op codes rather than
637 * blindly accepting any special request, the
638 * check for ->rq_disk above may be replaced
639 * by a more suitable mechanism or even
640 * dropped entirely.
641 */
642 return ide_special_rq(drive, rq);
1da177e4
LT
643
644 drv = *(ide_driver_t **)rq->rq_disk->private_data;
3c619ffd
BZ
645
646 return drv->do_request(drive, rq, rq->sector);
1da177e4
LT
647 }
648 return do_special(drive);
649kill_rq:
650 ide_kill_rq(drive, rq);
651 return ide_stopped;
652}
653
654/**
655 * ide_stall_queue - pause an IDE device
656 * @drive: drive to stall
657 * @timeout: time to stall for (jiffies)
658 *
659 * ide_stall_queue() can be used by a drive to give excess bandwidth back
660 * to the hwgroup by sleeping for timeout jiffies.
661 */
662
663void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
664{
665 if (timeout > WAIT_WORSTCASE)
666 timeout = WAIT_WORSTCASE;
667 drive->sleep = timeout + jiffies;
97100fc8 668 drive->dev_flags |= IDE_DFLAG_SLEEPING;
1da177e4 669}
1da177e4
LT
670EXPORT_SYMBOL(ide_stall_queue);
671
1da177e4
LT
672/*
673 * Issue a new request to a drive from hwgroup
1da177e4
LT
674 *
675 * A hwgroup is a serialized group of IDE interfaces. Usually there is
676 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
677 * may have both interfaces in a single hwgroup to "serialize" access.
678 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
679 * together into one hwgroup for serialized access.
680 *
681 * Note also that several hwgroups can end up sharing a single IRQ,
682 * possibly along with many other devices. This is especially common in
683 * PCI-based systems with off-board IDE controller cards.
684 *
201bffa4 685 * The IDE driver uses a per-hwgroup lock to protect the hwgroup->busy flag.
1da177e4
LT
686 *
687 * The first thread into the driver for a particular hwgroup sets the
688 * hwgroup->busy flag to indicate that this hwgroup is now active,
689 * and then initiates processing of the top request from the request queue.
690 *
691 * Other threads attempting entry notice the busy setting, and will simply
692 * queue their new requests and exit immediately. Note that hwgroup->busy
693 * remains set even when the driver is merely awaiting the next interrupt.
694 * Thus, the meaning is "this hwgroup is busy processing a request".
695 *
696 * When processing of a request completes, the completing thread or IRQ-handler
697 * will start the next request from the queue. If no more work remains,
698 * the driver will clear the hwgroup->busy flag and exit.
699 *
2a2ca6a9 700 * The per-hwgroup spinlock is used to protect all access to the
1da177e4
LT
701 * hwgroup->busy flag, but is otherwise not needed for most processing in
702 * the driver. This makes the driver much more friendlier to shared IRQs
703 * than previous designs, while remaining 100% (?) SMP safe and capable.
704 */
295f0004 705void do_ide_request(struct request_queue *q)
1da177e4 706{
201bffa4
BZ
707 ide_drive_t *drive = q->queuedata;
708 ide_hwif_t *hwif = drive->hwif;
709 ide_hwgroup_t *hwgroup = hwif->hwgroup;
1da177e4
LT
710 struct request *rq;
711 ide_startstop_t startstop;
712
201bffa4
BZ
713 /*
714 * drive is doing pre-flush, ordered write, post-flush sequence. even
715 * though that is 3 requests, it must be seen as a single transaction.
716 * we must not preempt this drive until that is complete
717 */
718 if (blk_queue_flushing(q))
1da177e4 719 /*
201bffa4
BZ
720 * small race where queue could get replugged during
721 * the 3-request flush cycle, just yank the plug since
722 * we want it to finish asap
1da177e4 723 */
201bffa4 724 blk_remove_plug(q);
1da177e4 725
201bffa4
BZ
726 spin_unlock_irq(q->queue_lock);
727 spin_lock_irq(&hwgroup->lock);
295f0004 728
201bffa4
BZ
729 if (!ide_lock_hwgroup(hwgroup)) {
730repeat:
731 hwgroup->rq = NULL;
2fb21150 732
201bffa4
BZ
733 if (drive->dev_flags & IDE_DFLAG_SLEEPING) {
734 if (time_before(drive->sleep, jiffies)) {
735 ide_unlock_hwgroup(hwgroup);
736 goto plug_device;
737 }
738 }
295f0004 739
f58c1ab8 740 if (hwif != hwgroup->hwif) {
7299a391
BZ
741 /*
742 * set nIEN for previous hwif, drives in the
743 * quirk_list may not like intr setups/cleanups
744 */
46aa7af1 745 if (drive->quirk_list == 0)
374e042c 746 hwif->tp_ops->set_irq(hwif, 0);
1da177e4
LT
747 }
748 hwgroup->hwif = hwif;
749 hwgroup->drive = drive;
4abdc6ee 750 drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);
1da177e4 751
201bffa4
BZ
752 spin_unlock_irq(&hwgroup->lock);
753 spin_lock_irq(q->queue_lock);
1da177e4
LT
754 /*
755 * we know that the queue isn't empty, but this can happen
756 * if the q->prep_rq_fn() decides to kill a request
757 */
758 rq = elv_next_request(drive->queue);
201bffa4
BZ
759 spin_unlock_irq(q->queue_lock);
760 spin_lock_irq(&hwgroup->lock);
761
1da177e4 762 if (!rq) {
631de370 763 ide_unlock_hwgroup(hwgroup);
201bffa4 764 goto out;
1da177e4
LT
765 }
766
767 /*
768 * Sanity: don't accept a request that isn't a PM request
769 * if we are currently power managed. This is very important as
770 * blk_stop_queue() doesn't prevent the elv_next_request()
771 * above to return us whatever is in the queue. Since we call
772 * ide_do_request() ourselves, we end up taking requests while
773 * the queue is blocked...
774 *
775 * We let requests forced at head of queue with ide-preempt
776 * though. I hope that doesn't happen too much, hopefully not
777 * unless the subdriver triggers such a thing in its own PM
778 * state machine.
779 */
97100fc8
BZ
780 if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
781 blk_pm_request(rq) == 0 &&
782 (rq->cmd_flags & REQ_PREEMPT) == 0) {
631de370
BZ
783 /* there should be no pending command at this point */
784 ide_unlock_hwgroup(hwgroup);
295f0004 785 goto plug_device;
1da177e4
LT
786 }
787
788 hwgroup->rq = rq;
789
295f0004 790 spin_unlock_irq(&hwgroup->lock);
1da177e4 791 startstop = start_request(drive, rq);
2a2ca6a9 792 spin_lock_irq(&hwgroup->lock);
295f0004 793
201bffa4
BZ
794 if (startstop == ide_stopped)
795 goto repeat;
796 } else
797 goto plug_device;
798out:
799 spin_unlock_irq(&hwgroup->lock);
800 spin_lock_irq(q->queue_lock);
295f0004 801 return;
1da177e4 802
295f0004 803plug_device:
201bffa4
BZ
804 spin_unlock_irq(&hwgroup->lock);
805 spin_lock_irq(q->queue_lock);
806
807 if (!elv_queue_empty(q))
808 blk_plug_device(q);
1da177e4
LT
809}
810
811/*
812 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
813 * retry the current request in pio mode instead of risking tossing it
814 * all away
815 */
816static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
817{
818 ide_hwif_t *hwif = HWIF(drive);
819 struct request *rq;
820 ide_startstop_t ret = ide_stopped;
821
822 /*
823 * end current dma transaction
824 */
825
826 if (error < 0) {
827 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
5e37bdc0 828 (void)hwif->dma_ops->dma_end(drive);
1da177e4 829 ret = ide_error(drive, "dma timeout error",
374e042c 830 hwif->tp_ops->read_status(hwif));
1da177e4
LT
831 } else {
832 printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
5e37bdc0 833 hwif->dma_ops->dma_timeout(drive);
1da177e4
LT
834 }
835
836 /*
837 * disable dma for now, but remember that we did so because of
838 * a timeout -- we'll reenable after we finish this next request
839 * (or rather the first chunk of it) in pio.
840 */
c3922048 841 drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY;
1da177e4 842 drive->retry_pio++;
4a546e04 843 ide_dma_off_quietly(drive);
1da177e4
LT
844
845 /*
846 * un-busy drive etc (hwgroup->busy is cleared on return) and
847 * make sure request is sane
848 */
849 rq = HWGROUP(drive)->rq;
ce42f191
HZ
850
851 if (!rq)
852 goto out;
853
1da177e4
LT
854 HWGROUP(drive)->rq = NULL;
855
856 rq->errors = 0;
857
858 if (!rq->bio)
859 goto out;
860
861 rq->sector = rq->bio->bi_sector;
862 rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9;
863 rq->hard_cur_sectors = rq->current_nr_sectors;
864 rq->buffer = bio_data(rq->bio);
865out:
866 return ret;
867}
868
201bffa4
BZ
869static void ide_plug_device(ide_drive_t *drive)
870{
871 struct request_queue *q = drive->queue;
872 unsigned long flags;
873
874 spin_lock_irqsave(q->queue_lock, flags);
875 if (!elv_queue_empty(q))
876 blk_plug_device(q);
877 spin_unlock_irqrestore(q->queue_lock, flags);
878}
879
1da177e4
LT
880/**
881 * ide_timer_expiry - handle lack of an IDE interrupt
882 * @data: timer callback magic (hwgroup)
883 *
884 * An IDE command has timed out before the expected drive return
885 * occurred. At this point we attempt to clean up the current
886 * mess. If the current handler includes an expiry handler then
887 * we invoke the expiry handler, and providing it is happy the
888 * work is done. If that fails we apply generic recovery rules
889 * invoking the handler and checking the drive DMA status. We
890 * have an excessively incestuous relationship with the DMA
891 * logic that wants cleaning up.
892 */
893
894void ide_timer_expiry (unsigned long data)
895{
896 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
201bffa4 897 ide_drive_t *uninitialized_var(drive);
1da177e4
LT
898 ide_handler_t *handler;
899 ide_expiry_t *expiry;
900 unsigned long flags;
901 unsigned long wait = -1;
201bffa4 902 int plug_device = 0;
1da177e4 903
2a2ca6a9 904 spin_lock_irqsave(&hwgroup->lock, flags);
1da177e4 905
23450319
SS
906 if (((handler = hwgroup->handler) == NULL) ||
907 (hwgroup->req_gen != hwgroup->req_gen_timer)) {
1da177e4
LT
908 /*
909 * Either a marginal timeout occurred
910 * (got the interrupt just as timer expired),
911 * or we were "sleeping" to give other devices a chance.
912 * Either way, we don't really want to complain about anything.
913 */
1da177e4 914 } else {
201bffa4 915 drive = hwgroup->drive;
1da177e4
LT
916 if (!drive) {
917 printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n");
918 hwgroup->handler = NULL;
919 } else {
920 ide_hwif_t *hwif;
921 ide_startstop_t startstop = ide_stopped;
b2cfb05a 922
1da177e4
LT
923 if ((expiry = hwgroup->expiry) != NULL) {
924 /* continue */
925 if ((wait = expiry(drive)) > 0) {
926 /* reset timer */
927 hwgroup->timer.expires = jiffies + wait;
23450319 928 hwgroup->req_gen_timer = hwgroup->req_gen;
1da177e4 929 add_timer(&hwgroup->timer);
2a2ca6a9 930 spin_unlock_irqrestore(&hwgroup->lock, flags);
1da177e4
LT
931 return;
932 }
933 }
934 hwgroup->handler = NULL;
935 /*
936 * We need to simulate a real interrupt when invoking
937 * the handler() function, which means we need to
938 * globally mask the specific IRQ:
939 */
2a2ca6a9 940 spin_unlock(&hwgroup->lock);
1da177e4 941 hwif = HWIF(drive);
1da177e4
LT
942 /* disable_irq_nosync ?? */
943 disable_irq(hwif->irq);
1da177e4
LT
944 /* local CPU only,
945 * as if we were handling an interrupt */
946 local_irq_disable();
947 if (hwgroup->polling) {
948 startstop = handler(drive);
949 } else if (drive_is_ready(drive)) {
950 if (drive->waiting_for_dma)
5e37bdc0 951 hwif->dma_ops->dma_lost_irq(drive);
1da177e4
LT
952 (void)ide_ack_intr(hwif);
953 printk(KERN_WARNING "%s: lost interrupt\n", drive->name);
954 startstop = handler(drive);
955 } else {
956 if (drive->waiting_for_dma) {
957 startstop = ide_dma_timeout_retry(drive, wait);
958 } else
959 startstop =
c47137a9 960 ide_error(drive, "irq timeout",
374e042c 961 hwif->tp_ops->read_status(hwif));
1da177e4 962 }
2a2ca6a9 963 spin_lock_irq(&hwgroup->lock);
1da177e4 964 enable_irq(hwif->irq);
295f0004 965 if (startstop == ide_stopped) {
631de370 966 ide_unlock_hwgroup(hwgroup);
201bffa4 967 plug_device = 1;
295f0004 968 }
1da177e4
LT
969 }
970 }
2a2ca6a9 971 spin_unlock_irqrestore(&hwgroup->lock, flags);
201bffa4
BZ
972
973 if (plug_device)
974 ide_plug_device(drive);
1da177e4
LT
975}
976
977/**
978 * unexpected_intr - handle an unexpected IDE interrupt
979 * @irq: interrupt line
980 * @hwgroup: hwgroup being processed
981 *
982 * There's nothing really useful we can do with an unexpected interrupt,
983 * other than reading the status register (to clear it), and logging it.
984 * There should be no way that an irq can happen before we're ready for it,
985 * so we needn't worry much about losing an "important" interrupt here.
986 *
987 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
988 * the drive enters "idle", "standby", or "sleep" mode, so if the status
989 * looks "good", we just ignore the interrupt completely.
990 *
991 * This routine assumes __cli() is in effect when called.
992 *
993 * If an unexpected interrupt happens on irq15 while we are handling irq14
994 * and if the two interfaces are "serialized" (CMD640), then it looks like
995 * we could screw up by interfering with a new request being set up for
996 * irq15.
997 *
998 * In reality, this is a non-issue. The new command is not sent unless
999 * the drive is ready to accept one, in which case we know the drive is
1000 * not trying to interrupt us. And ide_set_handler() is always invoked
1001 * before completing the issuance of any new drive command, so we will not
1002 * be accidentally invoked as a result of any valid command completion
1003 * interrupt.
1004 *
1005 * Note that we must walk the entire hwgroup here. We know which hwif
1006 * is doing the current command, but we don't know which hwif burped
1007 * mysteriously.
1008 */
1009
1010static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
1011{
1012 u8 stat;
1013 ide_hwif_t *hwif = hwgroup->hwif;
1014
1015 /*
1016 * handle the unexpected interrupt
1017 */
1018 do {
1019 if (hwif->irq == irq) {
374e042c 1020 stat = hwif->tp_ops->read_status(hwif);
b73c7ee2 1021
3a7d2484 1022 if (!OK_STAT(stat, ATA_DRDY, BAD_STAT)) {
1da177e4
LT
1023 /* Try to not flood the console with msgs */
1024 static unsigned long last_msgtime, count;
1025 ++count;
1026 if (time_after(jiffies, last_msgtime + HZ)) {
1027 last_msgtime = jiffies;
1028 printk(KERN_ERR "%s%s: unexpected interrupt, "
1029 "status=0x%02x, count=%ld\n",
1030 hwif->name,
1031 (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count);
1032 }
1033 }
1034 }
1035 } while ((hwif = hwif->next) != hwgroup->hwif);
1036}
1037
1038/**
1039 * ide_intr - default IDE interrupt handler
1040 * @irq: interrupt number
1041 * @dev_id: hwif group
1042 * @regs: unused weirdness from the kernel irq layer
1043 *
1044 * This is the default IRQ handler for the IDE layer. You should
1045 * not need to override it. If you do be aware it is subtle in
1046 * places
1047 *
1048 * hwgroup->hwif is the interface in the group currently performing
1049 * a command. hwgroup->drive is the drive and hwgroup->handler is
1050 * the IRQ handler to call. As we issue a command the handlers
1051 * step through multiple states, reassigning the handler to the
1052 * next step in the process. Unlike a smart SCSI controller IDE
1053 * expects the main processor to sequence the various transfer
1054 * stages. We also manage a poll timer to catch up with most
1055 * timeout situations. There are still a few where the handlers
1056 * don't ever decide to give up.
1057 *
1058 * The handler eventually returns ide_stopped to indicate the
1059 * request completed. At this point we issue the next request
1060 * on the hwgroup and the process begins again.
1061 */
1062
7d12e780 1063irqreturn_t ide_intr (int irq, void *dev_id)
1da177e4
LT
1064{
1065 unsigned long flags;
1066 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
2a2ca6a9 1067 ide_hwif_t *hwif = hwgroup->hwif;
201bffa4 1068 ide_drive_t *uninitialized_var(drive);
1da177e4
LT
1069 ide_handler_t *handler;
1070 ide_startstop_t startstop;
3e0e29f7 1071 irqreturn_t irq_ret = IRQ_NONE;
201bffa4 1072 int plug_device = 0;
1da177e4 1073
2a2ca6a9 1074 spin_lock_irqsave(&hwgroup->lock, flags);
1da177e4 1075
3e0e29f7
BZ
1076 if (!ide_ack_intr(hwif))
1077 goto out;
1da177e4
LT
1078
1079 if ((handler = hwgroup->handler) == NULL || hwgroup->polling) {
1080 /*
1081 * Not expecting an interrupt from this drive.
1082 * That means this could be:
1083 * (1) an interrupt from another PCI device
1084 * sharing the same PCI INT# as us.
1085 * or (2) a drive just entered sleep or standby mode,
1086 * and is interrupting to let us know.
1087 * or (3) a spurious interrupt of unknown origin.
1088 *
1089 * For PCI, we cannot tell the difference,
1090 * so in that case we just ignore it and hope it goes away.
1091 *
1092 * FIXME: unexpected_intr should be hwif-> then we can
1093 * remove all the ifdef PCI crap
1094 */
1095#ifdef CONFIG_BLK_DEV_IDEPCI
425afb61 1096 if (hwif->chipset != ide_pci)
1da177e4
LT
1097#endif /* CONFIG_BLK_DEV_IDEPCI */
1098 {
1099 /*
1100 * Probably not a shared PCI interrupt,
1101 * so we can safely try to do something about it:
1102 */
1103 unexpected_intr(irq, hwgroup);
1104#ifdef CONFIG_BLK_DEV_IDEPCI
1105 } else {
1106 /*
1107 * Whack the status register, just in case
1108 * we have a leftover pending IRQ.
1109 */
374e042c 1110 (void)hwif->tp_ops->read_status(hwif);
1da177e4
LT
1111#endif /* CONFIG_BLK_DEV_IDEPCI */
1112 }
3e0e29f7 1113 goto out;
1da177e4 1114 }
3e0e29f7 1115
1da177e4
LT
1116 drive = hwgroup->drive;
1117 if (!drive) {
1118 /*
1119 * This should NEVER happen, and there isn't much
1120 * we could do about it here.
1121 *
1122 * [Note - this can occur if the drive is hot unplugged]
1123 */
3e0e29f7 1124 goto out_handled;
1da177e4 1125 }
3e0e29f7
BZ
1126
1127 if (!drive_is_ready(drive))
1da177e4
LT
1128 /*
1129 * This happens regularly when we share a PCI IRQ with
1130 * another device. Unfortunately, it can also happen
1131 * with some buggy drives that trigger the IRQ before
1132 * their status register is up to date. Hopefully we have
1133 * enough advance overhead that the latter isn't a problem.
1134 */
3e0e29f7
BZ
1135 goto out;
1136
1da177e4 1137 hwgroup->handler = NULL;
23450319 1138 hwgroup->req_gen++;
1da177e4 1139 del_timer(&hwgroup->timer);
2a2ca6a9 1140 spin_unlock(&hwgroup->lock);
1da177e4 1141
bfa7d8e5
BZ
1142 if (hwif->port_ops && hwif->port_ops->clear_irq)
1143 hwif->port_ops->clear_irq(drive);
f0dd8712 1144
97100fc8 1145 if (drive->dev_flags & IDE_DFLAG_UNMASK)
366c7f55 1146 local_irq_enable_in_hardirq();
bfa7d8e5 1147
1da177e4
LT
1148 /* service this interrupt, may set handler for next interrupt */
1149 startstop = handler(drive);
1da177e4 1150
2a2ca6a9 1151 spin_lock_irq(&hwgroup->lock);
1da177e4
LT
1152 /*
1153 * Note that handler() may have set things up for another
1154 * interrupt to occur soon, but it cannot happen until
1155 * we exit from this routine, because it will be the
1156 * same irq as is currently being serviced here, and Linux
1157 * won't allow another of the same (on any CPU) until we return.
1158 */
1da177e4
LT
1159 if (startstop == ide_stopped) {
1160 if (hwgroup->handler == NULL) { /* paranoia */
631de370 1161 ide_unlock_hwgroup(hwgroup);
201bffa4 1162 plug_device = 1;
295f0004
BZ
1163 } else
1164 printk(KERN_ERR "%s: %s: huh? expected NULL handler "
1165 "on exit\n", __func__, drive->name);
1da177e4 1166 }
3e0e29f7
BZ
1167out_handled:
1168 irq_ret = IRQ_HANDLED;
1169out:
2a2ca6a9 1170 spin_unlock_irqrestore(&hwgroup->lock, flags);
201bffa4
BZ
1171
1172 if (plug_device)
1173 ide_plug_device(drive);
1174
3e0e29f7 1175 return irq_ret;
1da177e4
LT
1176}
1177
1da177e4
LT
1178/**
1179 * ide_do_drive_cmd - issue IDE special command
1180 * @drive: device to issue command
1181 * @rq: request to issue
1da177e4
LT
1182 *
1183 * This function issues a special IDE device request
1184 * onto the request queue.
1185 *
63f5abb0
FT
1186 * the rq is queued at the head of the request queue, displacing
1187 * the currently-being-processed request and this function
1188 * returns immediately without waiting for the new rq to be
1189 * completed. This is VERY DANGEROUS, and is intended for
1190 * careful use by the ATAPI tape/cdrom driver code.
1da177e4 1191 */
63f5abb0
FT
1192
1193void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq)
1da177e4 1194{
1d0bf587 1195 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
6ea52226 1196 struct request_queue *q = drive->queue;
1da177e4 1197 unsigned long flags;
e8a96aa7 1198
63f5abb0 1199 hwgroup->rq = NULL;
1d0bf587 1200
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1201 spin_lock_irqsave(q->queue_lock, flags);
1202 __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0);
1203 blk_start_queueing(q);
1204 spin_unlock_irqrestore(q->queue_lock, flags);
1da177e4 1205}
1da177e4 1206EXPORT_SYMBOL(ide_do_drive_cmd);
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1207
1208void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma)
1209{
6e6afb3b 1210 ide_hwif_t *hwif = drive->hwif;
2fc57388
BZ
1211 ide_task_t task;
1212
1213 memset(&task, 0, sizeof(task));
1214 task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM |
1215 IDE_TFLAG_OUT_FEATURE | tf_flags;
1216 task.tf.feature = dma; /* Use PIO/DMA */
1217 task.tf.lbam = bcount & 0xff;
1218 task.tf.lbah = (bcount >> 8) & 0xff;
1219
089c5c7e 1220 ide_tf_dump(drive->name, &task.tf);
374e042c 1221 hwif->tp_ops->set_irq(hwif, 1);
ed4af48f 1222 SELECT_MASK(drive, 0);
374e042c 1223 hwif->tp_ops->tf_load(drive, &task);
2fc57388
BZ
1224}
1225
1226EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load);
9f87abe8
BZ
1227
1228void ide_pad_transfer(ide_drive_t *drive, int write, int len)
1229{
1230 ide_hwif_t *hwif = drive->hwif;
1231 u8 buf[4] = { 0 };
1232
1233 while (len > 0) {
1234 if (write)
374e042c 1235 hwif->tp_ops->output_data(drive, NULL, buf, min(4, len));
9f87abe8 1236 else
374e042c 1237 hwif->tp_ops->input_data(drive, NULL, buf, min(4, len));
9f87abe8
BZ
1238 len -= 4;
1239 }
1240}
1241EXPORT_SYMBOL_GPL(ide_pad_transfer);