4 * Basic PIO and command management functionality.
6 * This code was split off from ide.c. See ide.c for history and original
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
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.
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.
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>
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>
43 #include <linux/completion.h>
44 #include <linux/reboot.h>
45 #include <linux/cdrom.h>
46 #include <linux/seq_file.h>
47 #include <linux/device.h>
48 #include <linux/kmod.h>
49 #include <linux/scatterlist.h>
51 #include <asm/byteorder.h>
53 #include <asm/uaccess.h>
55 #include <asm/bitops.h>
57 static int __ide_end_request(ide_drive_t
*drive
, struct request
*rq
,
58 int uptodate
, unsigned int nr_bytes
)
63 * if failfast is set on a request, override number of sectors and
64 * complete the whole request right now
66 if (blk_noretry_request(rq
) && end_io_error(uptodate
))
67 nr_bytes
= rq
->hard_nr_sectors
<< 9;
69 if (!blk_fs_request(rq
) && end_io_error(uptodate
) && !rq
->errors
)
73 * decide whether to reenable DMA -- 3 is a random magic for now,
74 * if we DMA timeout more than 3 times, just stay in PIO
76 if (drive
->state
== DMA_PIO_RETRY
&& drive
->retry_pio
<= 3) {
78 HWGROUP(drive
)->hwif
->ide_dma_on(drive
);
81 if (!end_that_request_chunk(rq
, uptodate
, nr_bytes
)) {
82 add_disk_randomness(rq
->rq_disk
);
83 if (!list_empty(&rq
->queuelist
))
84 blkdev_dequeue_request(rq
);
85 HWGROUP(drive
)->rq
= NULL
;
86 end_that_request_last(rq
, uptodate
);
94 * ide_end_request - complete an IDE I/O
95 * @drive: IDE device for the I/O
97 * @nr_sectors: number of sectors completed
99 * This is our end_request wrapper function. We complete the I/O
100 * update random number input and dequeue the request, which if
101 * it was tagged may be out of order.
104 int ide_end_request (ide_drive_t
*drive
, int uptodate
, int nr_sectors
)
106 unsigned int nr_bytes
= nr_sectors
<< 9;
112 * room for locking improvements here, the calls below don't
113 * need the queue lock held at all
115 spin_lock_irqsave(&ide_lock
, flags
);
116 rq
= HWGROUP(drive
)->rq
;
119 if (blk_pc_request(rq
))
120 nr_bytes
= rq
->data_len
;
122 nr_bytes
= rq
->hard_cur_sectors
<< 9;
125 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_bytes
);
127 spin_unlock_irqrestore(&ide_lock
, flags
);
130 EXPORT_SYMBOL(ide_end_request
);
133 * Power Management state machine. This one is rather trivial for now,
134 * we should probably add more, like switching back to PIO on suspend
135 * to help some BIOSes, re-do the door locking on resume, etc...
139 ide_pm_flush_cache
= ide_pm_state_start_suspend
,
142 idedisk_pm_restore_pio
= ide_pm_state_start_resume
,
147 static void ide_complete_power_step(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 error
)
149 struct request_pm_state
*pm
= rq
->data
;
151 if (drive
->media
!= ide_disk
)
154 switch (pm
->pm_step
) {
155 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) complete */
156 if (pm
->pm_state
== PM_EVENT_FREEZE
)
157 pm
->pm_step
= ide_pm_state_completed
;
159 pm
->pm_step
= idedisk_pm_standby
;
161 case idedisk_pm_standby
: /* Suspend step 2 (standby) complete */
162 pm
->pm_step
= ide_pm_state_completed
;
164 case idedisk_pm_restore_pio
: /* Resume step 1 complete */
165 pm
->pm_step
= idedisk_pm_idle
;
167 case idedisk_pm_idle
: /* Resume step 2 (idle) complete */
168 pm
->pm_step
= ide_pm_restore_dma
;
173 static ide_startstop_t
ide_start_power_step(ide_drive_t
*drive
, struct request
*rq
)
175 struct request_pm_state
*pm
= rq
->data
;
176 ide_task_t
*args
= rq
->special
;
178 memset(args
, 0, sizeof(*args
));
180 switch (pm
->pm_step
) {
181 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) */
182 if (drive
->media
!= ide_disk
)
184 /* Not supported? Switch to next step now. */
185 if (!drive
->wcache
|| !ide_id_has_flush_cache(drive
->id
)) {
186 ide_complete_power_step(drive
, rq
, 0, 0);
189 if (ide_id_has_flush_cache_ext(drive
->id
))
190 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_FLUSH_CACHE_EXT
;
192 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_FLUSH_CACHE
;
193 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
194 args
->handler
= &task_no_data_intr
;
195 return do_rw_taskfile(drive
, args
);
197 case idedisk_pm_standby
: /* Suspend step 2 (standby) */
198 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_STANDBYNOW1
;
199 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
200 args
->handler
= &task_no_data_intr
;
201 return do_rw_taskfile(drive
, args
);
203 case idedisk_pm_restore_pio
: /* Resume step 1 (restore PIO) */
204 if (drive
->hwif
->tuneproc
!= NULL
)
205 drive
->hwif
->tuneproc(drive
, 255);
207 * skip idedisk_pm_idle for ATAPI devices
209 if (drive
->media
!= ide_disk
)
210 pm
->pm_step
= ide_pm_restore_dma
;
212 ide_complete_power_step(drive
, rq
, 0, 0);
215 case idedisk_pm_idle
: /* Resume step 2 (idle) */
216 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_IDLEIMMEDIATE
;
217 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
218 args
->handler
= task_no_data_intr
;
219 return do_rw_taskfile(drive
, args
);
221 case ide_pm_restore_dma
: /* Resume step 3 (restore DMA) */
223 * Right now, all we do is call hwif->ide_dma_check(drive),
224 * we could be smarter and check for current xfer_speed
225 * in struct drive etc...
227 if (drive
->hwif
->ide_dma_check
== NULL
)
229 drive
->hwif
->dma_off_quietly(drive
);
231 * TODO: respect ->using_dma setting
236 pm
->pm_step
= ide_pm_state_completed
;
241 * ide_end_dequeued_request - complete an IDE I/O
242 * @drive: IDE device for the I/O
244 * @nr_sectors: number of sectors completed
246 * Complete an I/O that is no longer on the request queue. This
247 * typically occurs when we pull the request and issue a REQUEST_SENSE.
248 * We must still finish the old request but we must not tamper with the
249 * queue in the meantime.
251 * NOTE: This path does not handle barrier, but barrier is not supported
255 int ide_end_dequeued_request(ide_drive_t
*drive
, struct request
*rq
,
256 int uptodate
, int nr_sectors
)
261 spin_lock_irqsave(&ide_lock
, flags
);
263 BUG_ON(!blk_rq_started(rq
));
266 * if failfast is set on a request, override number of sectors and
267 * complete the whole request right now
269 if (blk_noretry_request(rq
) && end_io_error(uptodate
))
270 nr_sectors
= rq
->hard_nr_sectors
;
272 if (!blk_fs_request(rq
) && end_io_error(uptodate
) && !rq
->errors
)
276 * decide whether to reenable DMA -- 3 is a random magic for now,
277 * if we DMA timeout more than 3 times, just stay in PIO
279 if (drive
->state
== DMA_PIO_RETRY
&& drive
->retry_pio
<= 3) {
281 HWGROUP(drive
)->hwif
->ide_dma_on(drive
);
284 if (!end_that_request_first(rq
, uptodate
, nr_sectors
)) {
285 add_disk_randomness(rq
->rq_disk
);
286 if (blk_rq_tagged(rq
))
287 blk_queue_end_tag(drive
->queue
, rq
);
288 end_that_request_last(rq
, uptodate
);
291 spin_unlock_irqrestore(&ide_lock
, flags
);
294 EXPORT_SYMBOL_GPL(ide_end_dequeued_request
);
298 * ide_complete_pm_request - end the current Power Management request
299 * @drive: target drive
302 * This function cleans up the current PM request and stops the queue
305 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
310 printk("%s: completing PM request, %s\n", drive
->name
,
311 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
313 spin_lock_irqsave(&ide_lock
, flags
);
314 if (blk_pm_suspend_request(rq
)) {
315 blk_stop_queue(drive
->queue
);
318 blk_start_queue(drive
->queue
);
320 blkdev_dequeue_request(rq
);
321 HWGROUP(drive
)->rq
= NULL
;
322 end_that_request_last(rq
, 1);
323 spin_unlock_irqrestore(&ide_lock
, flags
);
327 * FIXME: probably move this somewhere else, name is bad too :)
329 u64
ide_get_error_location(ide_drive_t
*drive
, char *args
)
340 if (ide_id_has_flush_cache_ext(drive
->id
)) {
341 low
= (hcyl
<< 16) | (lcyl
<< 8) | sect
;
342 HWIF(drive
)->OUTB(drive
->ctl
|0x80, IDE_CONTROL_REG
);
343 high
= ide_read_24(drive
);
345 u8 cur
= HWIF(drive
)->INB(IDE_SELECT_REG
);
348 low
= (hcyl
<< 16) | (lcyl
<< 8) | sect
;
350 low
= hcyl
* drive
->head
* drive
->sect
;
351 low
+= lcyl
* drive
->sect
;
356 sector
= ((u64
) high
<< 24) | low
;
359 EXPORT_SYMBOL(ide_get_error_location
);
362 * ide_end_drive_cmd - end an explicit drive command
367 * Clean up after success/failure of an explicit drive command.
368 * These get thrown onto the queue so they are synchronized with
369 * real I/O operations on the drive.
371 * In LBA48 mode we have to read the register set twice to get
372 * all the extra information out.
375 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
377 ide_hwif_t
*hwif
= HWIF(drive
);
381 spin_lock_irqsave(&ide_lock
, flags
);
382 rq
= HWGROUP(drive
)->rq
;
383 spin_unlock_irqrestore(&ide_lock
, flags
);
385 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
386 u8
*args
= (u8
*) rq
->buffer
;
388 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
393 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
395 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
396 u8
*args
= (u8
*) rq
->buffer
;
398 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
403 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
404 args
[3] = hwif
->INB(IDE_SECTOR_REG
);
405 args
[4] = hwif
->INB(IDE_LCYL_REG
);
406 args
[5] = hwif
->INB(IDE_HCYL_REG
);
407 args
[6] = hwif
->INB(IDE_SELECT_REG
);
409 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
410 ide_task_t
*args
= (ide_task_t
*) rq
->special
;
412 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
415 if (args
->tf_in_flags
.b
.data
) {
416 u16 data
= hwif
->INW(IDE_DATA_REG
);
417 args
->tfRegister
[IDE_DATA_OFFSET
] = (data
) & 0xFF;
418 args
->hobRegister
[IDE_DATA_OFFSET
] = (data
>> 8) & 0xFF;
420 args
->tfRegister
[IDE_ERROR_OFFSET
] = err
;
421 /* be sure we're looking at the low order bits */
422 hwif
->OUTB(drive
->ctl
& ~0x80, IDE_CONTROL_REG
);
423 args
->tfRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
424 args
->tfRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
425 args
->tfRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
426 args
->tfRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
427 args
->tfRegister
[IDE_SELECT_OFFSET
] = hwif
->INB(IDE_SELECT_REG
);
428 args
->tfRegister
[IDE_STATUS_OFFSET
] = stat
;
430 if (drive
->addressing
== 1) {
431 hwif
->OUTB(drive
->ctl
|0x80, IDE_CONTROL_REG
);
432 args
->hobRegister
[IDE_FEATURE_OFFSET
] = hwif
->INB(IDE_FEATURE_REG
);
433 args
->hobRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
434 args
->hobRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
435 args
->hobRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
436 args
->hobRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
439 } else if (blk_pm_request(rq
)) {
440 struct request_pm_state
*pm
= rq
->data
;
442 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
443 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
445 ide_complete_power_step(drive
, rq
, stat
, err
);
446 if (pm
->pm_step
== ide_pm_state_completed
)
447 ide_complete_pm_request(drive
, rq
);
451 spin_lock_irqsave(&ide_lock
, flags
);
452 blkdev_dequeue_request(rq
);
453 HWGROUP(drive
)->rq
= NULL
;
455 end_that_request_last(rq
, !rq
->errors
);
456 spin_unlock_irqrestore(&ide_lock
, flags
);
459 EXPORT_SYMBOL(ide_end_drive_cmd
);
462 * try_to_flush_leftover_data - flush junk
463 * @drive: drive to flush
465 * try_to_flush_leftover_data() is invoked in response to a drive
466 * unexpectedly having its DRQ_STAT bit set. As an alternative to
467 * resetting the drive, this routine tries to clear the condition
468 * by read a sector's worth of data from the drive. Of course,
469 * this may not help if the drive is *waiting* for data from *us*.
471 static void try_to_flush_leftover_data (ide_drive_t
*drive
)
473 int i
= (drive
->mult_count
? drive
->mult_count
: 1) * SECTOR_WORDS
;
475 if (drive
->media
!= ide_disk
)
479 u32 wcount
= (i
> 16) ? 16 : i
;
482 HWIF(drive
)->ata_input_data(drive
, buffer
, wcount
);
486 static void ide_kill_rq(ide_drive_t
*drive
, struct request
*rq
)
491 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
492 drv
->end_request(drive
, 0, 0);
494 ide_end_request(drive
, 0, 0);
497 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
499 ide_hwif_t
*hwif
= drive
->hwif
;
501 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
502 /* other bits are useless when BUSY */
503 rq
->errors
|= ERROR_RESET
;
504 } else if (stat
& ERR_STAT
) {
505 /* err has different meaning on cdrom and tape */
506 if (err
== ABRT_ERR
) {
507 if (drive
->select
.b
.lba
&&
508 /* some newer drives don't support WIN_SPECIFY */
509 hwif
->INB(IDE_COMMAND_REG
) == WIN_SPECIFY
)
511 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
512 /* UDMA crc error, just retry the operation */
514 } else if (err
& (BBD_ERR
| ECC_ERR
)) {
515 /* retries won't help these */
516 rq
->errors
= ERROR_MAX
;
517 } else if (err
& TRK0_ERR
) {
518 /* help it find track zero */
519 rq
->errors
|= ERROR_RECAL
;
523 if ((stat
& DRQ_STAT
) && rq_data_dir(rq
) == READ
&& hwif
->err_stops_fifo
== 0)
524 try_to_flush_leftover_data(drive
);
526 if (rq
->errors
>= ERROR_MAX
|| blk_noretry_request(rq
)) {
527 ide_kill_rq(drive
, rq
);
531 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
532 rq
->errors
|= ERROR_RESET
;
534 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
536 return ide_do_reset(drive
);
539 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
540 drive
->special
.b
.recalibrate
= 1;
547 static ide_startstop_t
ide_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
549 ide_hwif_t
*hwif
= drive
->hwif
;
551 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
552 /* other bits are useless when BUSY */
553 rq
->errors
|= ERROR_RESET
;
555 /* add decoding error stuff */
558 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
560 hwif
->OUTB(WIN_IDLEIMMEDIATE
, IDE_COMMAND_REG
);
562 if (rq
->errors
>= ERROR_MAX
) {
563 ide_kill_rq(drive
, rq
);
565 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
567 return ide_do_reset(drive
);
576 __ide_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
578 if (drive
->media
== ide_disk
)
579 return ide_ata_error(drive
, rq
, stat
, err
);
580 return ide_atapi_error(drive
, rq
, stat
, err
);
583 EXPORT_SYMBOL_GPL(__ide_error
);
586 * ide_error - handle an error on the IDE
587 * @drive: drive the error occurred on
588 * @msg: message to report
591 * ide_error() takes action based on the error returned by the drive.
592 * For normal I/O that may well include retries. We deal with
593 * both new-style (taskfile) and old style command handling here.
594 * In the case of taskfile command handling there is work left to
598 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
603 err
= ide_dump_status(drive
, msg
, stat
);
605 if ((rq
= HWGROUP(drive
)->rq
) == NULL
)
608 /* retry only "normal" I/O: */
609 if (!blk_fs_request(rq
)) {
611 ide_end_drive_cmd(drive
, stat
, err
);
618 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
619 return drv
->error(drive
, rq
, stat
, err
);
621 return __ide_error(drive
, rq
, stat
, err
);
624 EXPORT_SYMBOL_GPL(ide_error
);
626 ide_startstop_t
__ide_abort(ide_drive_t
*drive
, struct request
*rq
)
628 if (drive
->media
!= ide_disk
)
629 rq
->errors
|= ERROR_RESET
;
631 ide_kill_rq(drive
, rq
);
636 EXPORT_SYMBOL_GPL(__ide_abort
);
639 * ide_abort - abort pending IDE operations
640 * @drive: drive the error occurred on
641 * @msg: message to report
643 * ide_abort kills and cleans up when we are about to do a
644 * host initiated reset on active commands. Longer term we
645 * want handlers to have sensible abort handling themselves
647 * This differs fundamentally from ide_error because in
648 * this case the command is doing just fine when we
652 ide_startstop_t
ide_abort(ide_drive_t
*drive
, const char *msg
)
656 if (drive
== NULL
|| (rq
= HWGROUP(drive
)->rq
) == NULL
)
659 /* retry only "normal" I/O: */
660 if (!blk_fs_request(rq
)) {
662 ide_end_drive_cmd(drive
, BUSY_STAT
, 0);
669 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
670 return drv
->abort(drive
, rq
);
672 return __ide_abort(drive
, rq
);
676 * ide_cmd - issue a simple drive command
677 * @drive: drive the command is for
679 * @nsect: sector byte
680 * @handler: handler for the command completion
682 * Issue a simple drive command with interrupts.
683 * The drive must be selected beforehand.
686 static void ide_cmd (ide_drive_t
*drive
, u8 cmd
, u8 nsect
,
687 ide_handler_t
*handler
)
689 ide_hwif_t
*hwif
= HWIF(drive
);
691 hwif
->OUTB(drive
->ctl
,IDE_CONTROL_REG
); /* clear nIEN */
692 SELECT_MASK(drive
,0);
693 hwif
->OUTB(nsect
,IDE_NSECTOR_REG
);
694 ide_execute_command(drive
, cmd
, handler
, WAIT_CMD
, NULL
);
698 * drive_cmd_intr - drive command completion interrupt
699 * @drive: drive the completion interrupt occurred on
701 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
702 * We do any necessary data reading and then wait for the drive to
703 * go non busy. At that point we may read the error data and complete
707 static ide_startstop_t
drive_cmd_intr (ide_drive_t
*drive
)
709 struct request
*rq
= HWGROUP(drive
)->rq
;
710 ide_hwif_t
*hwif
= HWIF(drive
);
711 u8
*args
= (u8
*) rq
->buffer
;
712 u8 stat
= hwif
->INB(IDE_STATUS_REG
);
715 local_irq_enable_in_hardirq();
716 if ((stat
& DRQ_STAT
) && args
&& args
[3]) {
717 u8 io_32bit
= drive
->io_32bit
;
719 hwif
->ata_input_data(drive
, &args
[4], args
[3] * SECTOR_WORDS
);
720 drive
->io_32bit
= io_32bit
;
721 while (((stat
= hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) && retries
--)
725 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
))
726 return ide_error(drive
, "drive_cmd", stat
);
727 /* calls ide_end_drive_cmd */
728 ide_end_drive_cmd(drive
, stat
, hwif
->INB(IDE_ERROR_REG
));
732 static void ide_init_specify_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
734 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->sect
;
735 task
->tfRegister
[IDE_SECTOR_OFFSET
] = drive
->sect
;
736 task
->tfRegister
[IDE_LCYL_OFFSET
] = drive
->cyl
;
737 task
->tfRegister
[IDE_HCYL_OFFSET
] = drive
->cyl
>>8;
738 task
->tfRegister
[IDE_SELECT_OFFSET
] = ((drive
->head
-1)|drive
->select
.all
)&0xBF;
739 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_SPECIFY
;
741 task
->handler
= &set_geometry_intr
;
744 static void ide_init_restore_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
746 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->sect
;
747 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_RESTORE
;
749 task
->handler
= &recal_intr
;
752 static void ide_init_setmult_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
754 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->mult_req
;
755 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_SETMULT
;
757 task
->handler
= &set_multmode_intr
;
760 static ide_startstop_t
ide_disk_special(ide_drive_t
*drive
)
762 special_t
*s
= &drive
->special
;
765 memset(&args
, 0, sizeof(ide_task_t
));
766 args
.command_type
= IDE_DRIVE_TASK_NO_DATA
;
768 if (s
->b
.set_geometry
) {
769 s
->b
.set_geometry
= 0;
770 ide_init_specify_cmd(drive
, &args
);
771 } else if (s
->b
.recalibrate
) {
772 s
->b
.recalibrate
= 0;
773 ide_init_restore_cmd(drive
, &args
);
774 } else if (s
->b
.set_multmode
) {
775 s
->b
.set_multmode
= 0;
776 if (drive
->mult_req
> drive
->id
->max_multsect
)
777 drive
->mult_req
= drive
->id
->max_multsect
;
778 ide_init_setmult_cmd(drive
, &args
);
780 int special
= s
->all
;
782 printk(KERN_ERR
"%s: bad special flag: 0x%02x\n", drive
->name
, special
);
786 do_rw_taskfile(drive
, &args
);
792 * do_special - issue some special commands
793 * @drive: drive the command is for
795 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
796 * commands to a drive. It used to do much more, but has been scaled
800 static ide_startstop_t
do_special (ide_drive_t
*drive
)
802 special_t
*s
= &drive
->special
;
805 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
809 if (HWIF(drive
)->tuneproc
!= NULL
)
810 HWIF(drive
)->tuneproc(drive
, drive
->tune_req
);
813 if (drive
->media
== ide_disk
)
814 return ide_disk_special(drive
);
822 void ide_map_sg(ide_drive_t
*drive
, struct request
*rq
)
824 ide_hwif_t
*hwif
= drive
->hwif
;
825 struct scatterlist
*sg
= hwif
->sg_table
;
827 if (hwif
->sg_mapped
) /* needed by ide-scsi */
830 if (rq
->cmd_type
!= REQ_TYPE_ATA_TASKFILE
) {
831 hwif
->sg_nents
= blk_rq_map_sg(drive
->queue
, rq
, sg
);
833 sg_init_one(sg
, rq
->buffer
, rq
->nr_sectors
* SECTOR_SIZE
);
838 EXPORT_SYMBOL_GPL(ide_map_sg
);
840 void ide_init_sg_cmd(ide_drive_t
*drive
, struct request
*rq
)
842 ide_hwif_t
*hwif
= drive
->hwif
;
844 hwif
->nsect
= hwif
->nleft
= rq
->nr_sectors
;
845 hwif
->cursg
= hwif
->cursg_ofs
= 0;
848 EXPORT_SYMBOL_GPL(ide_init_sg_cmd
);
851 * execute_drive_command - issue special drive command
852 * @drive: the drive to issue the command on
853 * @rq: the request structure holding the command
855 * execute_drive_cmd() issues a special drive command, usually
856 * initiated by ioctl() from the external hdparm program. The
857 * command can be a drive command, drive task or taskfile
858 * operation. Weirdly you can call it with NULL to wait for
859 * all commands to finish. Don't do this as that is due to change
862 static ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
,
865 ide_hwif_t
*hwif
= HWIF(drive
);
866 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
867 ide_task_t
*args
= rq
->special
;
872 hwif
->data_phase
= args
->data_phase
;
874 switch (hwif
->data_phase
) {
875 case TASKFILE_MULTI_OUT
:
877 case TASKFILE_MULTI_IN
:
879 ide_init_sg_cmd(drive
, rq
);
880 ide_map_sg(drive
, rq
);
885 if (args
->tf_out_flags
.all
!= 0)
886 return flagged_taskfile(drive
, args
);
887 return do_rw_taskfile(drive
, args
);
888 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
889 u8
*args
= rq
->buffer
;
895 printk("%s: DRIVE_TASK_CMD ", drive
->name
);
896 printk("cmd=0x%02x ", args
[0]);
897 printk("fr=0x%02x ", args
[1]);
898 printk("ns=0x%02x ", args
[2]);
899 printk("sc=0x%02x ", args
[3]);
900 printk("lcyl=0x%02x ", args
[4]);
901 printk("hcyl=0x%02x ", args
[5]);
902 printk("sel=0x%02x\n", args
[6]);
904 hwif
->OUTB(args
[1], IDE_FEATURE_REG
);
905 hwif
->OUTB(args
[3], IDE_SECTOR_REG
);
906 hwif
->OUTB(args
[4], IDE_LCYL_REG
);
907 hwif
->OUTB(args
[5], IDE_HCYL_REG
);
908 sel
= (args
[6] & ~0x10);
909 if (drive
->select
.b
.unit
)
911 hwif
->OUTB(sel
, IDE_SELECT_REG
);
912 ide_cmd(drive
, args
[0], args
[2], &drive_cmd_intr
);
914 } else if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
915 u8
*args
= rq
->buffer
;
920 printk("%s: DRIVE_CMD ", drive
->name
);
921 printk("cmd=0x%02x ", args
[0]);
922 printk("sc=0x%02x ", args
[1]);
923 printk("fr=0x%02x ", args
[2]);
924 printk("xx=0x%02x\n", args
[3]);
926 if (args
[0] == WIN_SMART
) {
927 hwif
->OUTB(0x4f, IDE_LCYL_REG
);
928 hwif
->OUTB(0xc2, IDE_HCYL_REG
);
929 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
930 hwif
->OUTB(args
[1],IDE_SECTOR_REG
);
931 ide_cmd(drive
, args
[0], args
[3], &drive_cmd_intr
);
934 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
935 ide_cmd(drive
, args
[0], args
[1], &drive_cmd_intr
);
941 * NULL is actually a valid way of waiting for
942 * all current requests to be flushed from the queue.
945 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
947 ide_end_drive_cmd(drive
,
948 hwif
->INB(IDE_STATUS_REG
),
949 hwif
->INB(IDE_ERROR_REG
));
953 static void ide_check_pm_state(ide_drive_t
*drive
, struct request
*rq
)
955 struct request_pm_state
*pm
= rq
->data
;
957 if (blk_pm_suspend_request(rq
) &&
958 pm
->pm_step
== ide_pm_state_start_suspend
)
959 /* Mark drive blocked when starting the suspend sequence. */
961 else if (blk_pm_resume_request(rq
) &&
962 pm
->pm_step
== ide_pm_state_start_resume
) {
964 * The first thing we do on wakeup is to wait for BSY bit to
965 * go away (with a looong timeout) as a drive on this hwif may
966 * just be POSTing itself.
967 * We do that before even selecting as the "other" device on
968 * the bus may be broken enough to walk on our toes at this
973 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
975 rc
= ide_wait_not_busy(HWIF(drive
), 35000);
977 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
979 HWIF(drive
)->OUTB(8, HWIF(drive
)->io_ports
[IDE_CONTROL_OFFSET
]);
980 rc
= ide_wait_not_busy(HWIF(drive
), 100000);
982 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
987 * start_request - start of I/O and command issuing for IDE
989 * start_request() initiates handling of a new I/O request. It
990 * accepts commands and I/O (read/write) requests. It also does
991 * the final remapping for weird stuff like EZDrive. Once
992 * device mapper can work sector level the EZDrive stuff can go away
994 * FIXME: this function needs a rename
997 static ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
999 ide_startstop_t startstop
;
1002 BUG_ON(!blk_rq_started(rq
));
1005 printk("%s: start_request: current=0x%08lx\n",
1006 HWIF(drive
)->name
, (unsigned long) rq
);
1009 /* bail early if we've exceeded max_failures */
1010 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
1015 if (blk_fs_request(rq
) &&
1016 (drive
->media
== ide_disk
|| drive
->media
== ide_floppy
)) {
1017 block
+= drive
->sect0
;
1019 /* Yecch - this will shift the entire interval,
1020 possibly killing some innocent following sector */
1021 if (block
== 0 && drive
->remap_0_to_1
== 1)
1022 block
= 1; /* redirect MBR access to EZ-Drive partn table */
1024 if (blk_pm_request(rq
))
1025 ide_check_pm_state(drive
, rq
);
1027 SELECT_DRIVE(drive
);
1028 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
, BUSY_STAT
|DRQ_STAT
, WAIT_READY
)) {
1029 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
1032 if (!drive
->special
.all
) {
1036 * We reset the drive so we need to issue a SETFEATURES.
1037 * Do it _after_ do_special() restored device parameters.
1039 if (drive
->current_speed
== 0xff)
1040 ide_config_drive_speed(drive
, drive
->desired_speed
);
1042 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
||
1043 rq
->cmd_type
== REQ_TYPE_ATA_TASK
||
1044 rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
)
1045 return execute_drive_cmd(drive
, rq
);
1046 else if (blk_pm_request(rq
)) {
1047 struct request_pm_state
*pm
= rq
->data
;
1049 printk("%s: start_power_step(step: %d)\n",
1050 drive
->name
, rq
->pm
->pm_step
);
1052 startstop
= ide_start_power_step(drive
, rq
);
1053 if (startstop
== ide_stopped
&&
1054 pm
->pm_step
== ide_pm_state_completed
)
1055 ide_complete_pm_request(drive
, rq
);
1059 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
1060 return drv
->do_request(drive
, rq
, block
);
1062 return do_special(drive
);
1064 ide_kill_rq(drive
, rq
);
1069 * ide_stall_queue - pause an IDE device
1070 * @drive: drive to stall
1071 * @timeout: time to stall for (jiffies)
1073 * ide_stall_queue() can be used by a drive to give excess bandwidth back
1074 * to the hwgroup by sleeping for timeout jiffies.
1077 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
1079 if (timeout
> WAIT_WORSTCASE
)
1080 timeout
= WAIT_WORSTCASE
;
1081 drive
->sleep
= timeout
+ jiffies
;
1082 drive
->sleeping
= 1;
1085 EXPORT_SYMBOL(ide_stall_queue
);
1087 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
1090 * choose_drive - select a drive to service
1091 * @hwgroup: hardware group to select on
1093 * choose_drive() selects the next drive which will be serviced.
1094 * This is necessary because the IDE layer can't issue commands
1095 * to both drives on the same cable, unlike SCSI.
1098 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
1100 ide_drive_t
*drive
, *best
;
1104 drive
= hwgroup
->drive
;
1107 * drive is doing pre-flush, ordered write, post-flush sequence. even
1108 * though that is 3 requests, it must be seen as a single transaction.
1109 * we must not preempt this drive until that is complete
1111 if (blk_queue_flushing(drive
->queue
)) {
1113 * small race where queue could get replugged during
1114 * the 3-request flush cycle, just yank the plug since
1115 * we want it to finish asap
1117 blk_remove_plug(drive
->queue
);
1122 if ((!drive
->sleeping
|| time_after_eq(jiffies
, drive
->sleep
))
1123 && !elv_queue_empty(drive
->queue
)) {
1125 || (drive
->sleeping
&& (!best
->sleeping
|| time_before(drive
->sleep
, best
->sleep
)))
1126 || (!best
->sleeping
&& time_before(WAKEUP(drive
), WAKEUP(best
))))
1128 if (!blk_queue_plugged(drive
->queue
))
1132 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1133 if (best
&& best
->nice1
&& !best
->sleeping
&& best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
1134 long t
= (signed long)(WAKEUP(best
) - jiffies
);
1135 if (t
>= WAIT_MIN_SLEEP
) {
1137 * We *may* have some time to spare, but first let's see if
1138 * someone can potentially benefit from our nice mood today..
1142 if (!drive
->sleeping
1143 && time_before(jiffies
- best
->service_time
, WAKEUP(drive
))
1144 && time_before(WAKEUP(drive
), jiffies
+ t
))
1146 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
1149 } while ((drive
= drive
->next
) != best
);
1156 * Issue a new request to a drive from hwgroup
1157 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
1159 * A hwgroup is a serialized group of IDE interfaces. Usually there is
1160 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
1161 * may have both interfaces in a single hwgroup to "serialize" access.
1162 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
1163 * together into one hwgroup for serialized access.
1165 * Note also that several hwgroups can end up sharing a single IRQ,
1166 * possibly along with many other devices. This is especially common in
1167 * PCI-based systems with off-board IDE controller cards.
1169 * The IDE driver uses the single global ide_lock spinlock to protect
1170 * access to the request queues, and to protect the hwgroup->busy flag.
1172 * The first thread into the driver for a particular hwgroup sets the
1173 * hwgroup->busy flag to indicate that this hwgroup is now active,
1174 * and then initiates processing of the top request from the request queue.
1176 * Other threads attempting entry notice the busy setting, and will simply
1177 * queue their new requests and exit immediately. Note that hwgroup->busy
1178 * remains set even when the driver is merely awaiting the next interrupt.
1179 * Thus, the meaning is "this hwgroup is busy processing a request".
1181 * When processing of a request completes, the completing thread or IRQ-handler
1182 * will start the next request from the queue. If no more work remains,
1183 * the driver will clear the hwgroup->busy flag and exit.
1185 * The ide_lock (spinlock) is used to protect all access to the
1186 * hwgroup->busy flag, but is otherwise not needed for most processing in
1187 * the driver. This makes the driver much more friendlier to shared IRQs
1188 * than previous designs, while remaining 100% (?) SMP safe and capable.
1190 static void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
1195 ide_startstop_t startstop
;
1198 /* for atari only: POSSIBLY BROKEN HERE(?) */
1199 ide_get_lock(ide_intr
, hwgroup
);
1201 /* caller must own ide_lock */
1202 BUG_ON(!irqs_disabled());
1204 while (!hwgroup
->busy
) {
1206 drive
= choose_drive(hwgroup
);
1207 if (drive
== NULL
) {
1209 unsigned long sleep
= 0; /* shut up, gcc */
1211 drive
= hwgroup
->drive
;
1213 if (drive
->sleeping
&& (!sleeping
|| time_before(drive
->sleep
, sleep
))) {
1215 sleep
= drive
->sleep
;
1217 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1220 * Take a short snooze, and then wake up this hwgroup again.
1221 * This gives other hwgroups on the same a chance to
1222 * play fairly with us, just in case there are big differences
1223 * in relative throughputs.. don't want to hog the cpu too much.
1225 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
1226 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
1228 if (timer_pending(&hwgroup
->timer
))
1229 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
1231 /* so that ide_timer_expiry knows what to do */
1232 hwgroup
->sleeping
= 1;
1233 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1234 mod_timer(&hwgroup
->timer
, sleep
);
1235 /* we purposely leave hwgroup->busy==1
1238 /* Ugly, but how can we sleep for the lock
1239 * otherwise? perhaps from tq_disk?
1242 /* for atari only */
1247 /* no more work for this hwgroup (for now) */
1252 if (hwgroup
->hwif
->sharing_irq
&&
1253 hwif
!= hwgroup
->hwif
&&
1254 hwif
->io_ports
[IDE_CONTROL_OFFSET
]) {
1255 /* set nIEN for previous hwif */
1256 SELECT_INTERRUPT(drive
);
1258 hwgroup
->hwif
= hwif
;
1259 hwgroup
->drive
= drive
;
1260 drive
->sleeping
= 0;
1261 drive
->service_start
= jiffies
;
1263 if (blk_queue_plugged(drive
->queue
)) {
1264 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1269 * we know that the queue isn't empty, but this can happen
1270 * if the q->prep_rq_fn() decides to kill a request
1272 rq
= elv_next_request(drive
->queue
);
1279 * Sanity: don't accept a request that isn't a PM request
1280 * if we are currently power managed. This is very important as
1281 * blk_stop_queue() doesn't prevent the elv_next_request()
1282 * above to return us whatever is in the queue. Since we call
1283 * ide_do_request() ourselves, we end up taking requests while
1284 * the queue is blocked...
1286 * We let requests forced at head of queue with ide-preempt
1287 * though. I hope that doesn't happen too much, hopefully not
1288 * unless the subdriver triggers such a thing in its own PM
1291 * We count how many times we loop here to make sure we service
1292 * all drives in the hwgroup without looping for ever
1294 if (drive
->blocked
&& !blk_pm_request(rq
) && !(rq
->cmd_flags
& REQ_PREEMPT
)) {
1295 drive
= drive
->next
? drive
->next
: hwgroup
->drive
;
1296 if (loops
++ < 4 && !blk_queue_plugged(drive
->queue
))
1298 /* We clear busy, there should be no pending ATA command at this point. */
1306 * Some systems have trouble with IDE IRQs arriving while
1307 * the driver is still setting things up. So, here we disable
1308 * the IRQ used by this interface while the request is being started.
1309 * This may look bad at first, but pretty much the same thing
1310 * happens anyway when any interrupt comes in, IDE or otherwise
1311 * -- the kernel masks the IRQ while it is being handled.
1313 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1314 disable_irq_nosync(hwif
->irq
);
1315 spin_unlock(&ide_lock
);
1316 local_irq_enable_in_hardirq();
1317 /* allow other IRQs while we start this request */
1318 startstop
= start_request(drive
, rq
);
1319 spin_lock_irq(&ide_lock
);
1320 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1321 enable_irq(hwif
->irq
);
1322 if (startstop
== ide_stopped
)
1328 * Passes the stuff to ide_do_request
1330 void do_ide_request(struct request_queue
*q
)
1332 ide_drive_t
*drive
= q
->queuedata
;
1334 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1338 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1339 * retry the current request in pio mode instead of risking tossing it
1342 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1344 ide_hwif_t
*hwif
= HWIF(drive
);
1346 ide_startstop_t ret
= ide_stopped
;
1349 * end current dma transaction
1353 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1354 (void)HWIF(drive
)->ide_dma_end(drive
);
1355 ret
= ide_error(drive
, "dma timeout error",
1356 hwif
->INB(IDE_STATUS_REG
));
1358 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1359 hwif
->dma_timeout(drive
);
1363 * disable dma for now, but remember that we did so because of
1364 * a timeout -- we'll reenable after we finish this next request
1365 * (or rather the first chunk of it) in pio.
1368 drive
->state
= DMA_PIO_RETRY
;
1369 hwif
->dma_off_quietly(drive
);
1372 * un-busy drive etc (hwgroup->busy is cleared on return) and
1373 * make sure request is sane
1375 rq
= HWGROUP(drive
)->rq
;
1380 HWGROUP(drive
)->rq
= NULL
;
1387 rq
->sector
= rq
->bio
->bi_sector
;
1388 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1389 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1390 rq
->buffer
= bio_data(rq
->bio
);
1396 * ide_timer_expiry - handle lack of an IDE interrupt
1397 * @data: timer callback magic (hwgroup)
1399 * An IDE command has timed out before the expected drive return
1400 * occurred. At this point we attempt to clean up the current
1401 * mess. If the current handler includes an expiry handler then
1402 * we invoke the expiry handler, and providing it is happy the
1403 * work is done. If that fails we apply generic recovery rules
1404 * invoking the handler and checking the drive DMA status. We
1405 * have an excessively incestuous relationship with the DMA
1406 * logic that wants cleaning up.
1409 void ide_timer_expiry (unsigned long data
)
1411 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1412 ide_handler_t
*handler
;
1413 ide_expiry_t
*expiry
;
1414 unsigned long flags
;
1415 unsigned long wait
= -1;
1417 spin_lock_irqsave(&ide_lock
, flags
);
1419 if (((handler
= hwgroup
->handler
) == NULL
) ||
1420 (hwgroup
->req_gen
!= hwgroup
->req_gen_timer
)) {
1422 * Either a marginal timeout occurred
1423 * (got the interrupt just as timer expired),
1424 * or we were "sleeping" to give other devices a chance.
1425 * Either way, we don't really want to complain about anything.
1427 if (hwgroup
->sleeping
) {
1428 hwgroup
->sleeping
= 0;
1432 ide_drive_t
*drive
= hwgroup
->drive
;
1434 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1435 hwgroup
->handler
= NULL
;
1438 ide_startstop_t startstop
= ide_stopped
;
1439 if (!hwgroup
->busy
) {
1440 hwgroup
->busy
= 1; /* paranoia */
1441 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1443 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1445 if ((wait
= expiry(drive
)) > 0) {
1447 hwgroup
->timer
.expires
= jiffies
+ wait
;
1448 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1449 add_timer(&hwgroup
->timer
);
1450 spin_unlock_irqrestore(&ide_lock
, flags
);
1454 hwgroup
->handler
= NULL
;
1456 * We need to simulate a real interrupt when invoking
1457 * the handler() function, which means we need to
1458 * globally mask the specific IRQ:
1460 spin_unlock(&ide_lock
);
1462 #if DISABLE_IRQ_NOSYNC
1463 disable_irq_nosync(hwif
->irq
);
1465 /* disable_irq_nosync ?? */
1466 disable_irq(hwif
->irq
);
1467 #endif /* DISABLE_IRQ_NOSYNC */
1469 * as if we were handling an interrupt */
1470 local_irq_disable();
1471 if (hwgroup
->polling
) {
1472 startstop
= handler(drive
);
1473 } else if (drive_is_ready(drive
)) {
1474 if (drive
->waiting_for_dma
)
1475 hwgroup
->hwif
->dma_lost_irq(drive
);
1476 (void)ide_ack_intr(hwif
);
1477 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1478 startstop
= handler(drive
);
1480 if (drive
->waiting_for_dma
) {
1481 startstop
= ide_dma_timeout_retry(drive
, wait
);
1484 ide_error(drive
, "irq timeout", hwif
->INB(IDE_STATUS_REG
));
1486 drive
->service_time
= jiffies
- drive
->service_start
;
1487 spin_lock_irq(&ide_lock
);
1488 enable_irq(hwif
->irq
);
1489 if (startstop
== ide_stopped
)
1493 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1494 spin_unlock_irqrestore(&ide_lock
, flags
);
1498 * unexpected_intr - handle an unexpected IDE interrupt
1499 * @irq: interrupt line
1500 * @hwgroup: hwgroup being processed
1502 * There's nothing really useful we can do with an unexpected interrupt,
1503 * other than reading the status register (to clear it), and logging it.
1504 * There should be no way that an irq can happen before we're ready for it,
1505 * so we needn't worry much about losing an "important" interrupt here.
1507 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1508 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1509 * looks "good", we just ignore the interrupt completely.
1511 * This routine assumes __cli() is in effect when called.
1513 * If an unexpected interrupt happens on irq15 while we are handling irq14
1514 * and if the two interfaces are "serialized" (CMD640), then it looks like
1515 * we could screw up by interfering with a new request being set up for
1518 * In reality, this is a non-issue. The new command is not sent unless
1519 * the drive is ready to accept one, in which case we know the drive is
1520 * not trying to interrupt us. And ide_set_handler() is always invoked
1521 * before completing the issuance of any new drive command, so we will not
1522 * be accidentally invoked as a result of any valid command completion
1525 * Note that we must walk the entire hwgroup here. We know which hwif
1526 * is doing the current command, but we don't know which hwif burped
1530 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1533 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1536 * handle the unexpected interrupt
1539 if (hwif
->irq
== irq
) {
1540 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1541 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
)) {
1542 /* Try to not flood the console with msgs */
1543 static unsigned long last_msgtime
, count
;
1545 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1546 last_msgtime
= jiffies
;
1547 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1548 "status=0x%02x, count=%ld\n",
1550 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1554 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1558 * ide_intr - default IDE interrupt handler
1559 * @irq: interrupt number
1560 * @dev_id: hwif group
1561 * @regs: unused weirdness from the kernel irq layer
1563 * This is the default IRQ handler for the IDE layer. You should
1564 * not need to override it. If you do be aware it is subtle in
1567 * hwgroup->hwif is the interface in the group currently performing
1568 * a command. hwgroup->drive is the drive and hwgroup->handler is
1569 * the IRQ handler to call. As we issue a command the handlers
1570 * step through multiple states, reassigning the handler to the
1571 * next step in the process. Unlike a smart SCSI controller IDE
1572 * expects the main processor to sequence the various transfer
1573 * stages. We also manage a poll timer to catch up with most
1574 * timeout situations. There are still a few where the handlers
1575 * don't ever decide to give up.
1577 * The handler eventually returns ide_stopped to indicate the
1578 * request completed. At this point we issue the next request
1579 * on the hwgroup and the process begins again.
1582 irqreturn_t
ide_intr (int irq
, void *dev_id
)
1584 unsigned long flags
;
1585 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1588 ide_handler_t
*handler
;
1589 ide_startstop_t startstop
;
1591 spin_lock_irqsave(&ide_lock
, flags
);
1592 hwif
= hwgroup
->hwif
;
1594 if (!ide_ack_intr(hwif
)) {
1595 spin_unlock_irqrestore(&ide_lock
, flags
);
1599 if ((handler
= hwgroup
->handler
) == NULL
|| hwgroup
->polling
) {
1601 * Not expecting an interrupt from this drive.
1602 * That means this could be:
1603 * (1) an interrupt from another PCI device
1604 * sharing the same PCI INT# as us.
1605 * or (2) a drive just entered sleep or standby mode,
1606 * and is interrupting to let us know.
1607 * or (3) a spurious interrupt of unknown origin.
1609 * For PCI, we cannot tell the difference,
1610 * so in that case we just ignore it and hope it goes away.
1612 * FIXME: unexpected_intr should be hwif-> then we can
1613 * remove all the ifdef PCI crap
1615 #ifdef CONFIG_BLK_DEV_IDEPCI
1616 if (hwif
->pci_dev
&& !hwif
->pci_dev
->vendor
)
1617 #endif /* CONFIG_BLK_DEV_IDEPCI */
1620 * Probably not a shared PCI interrupt,
1621 * so we can safely try to do something about it:
1623 unexpected_intr(irq
, hwgroup
);
1624 #ifdef CONFIG_BLK_DEV_IDEPCI
1627 * Whack the status register, just in case
1628 * we have a leftover pending IRQ.
1630 (void) hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1631 #endif /* CONFIG_BLK_DEV_IDEPCI */
1633 spin_unlock_irqrestore(&ide_lock
, flags
);
1636 drive
= hwgroup
->drive
;
1639 * This should NEVER happen, and there isn't much
1640 * we could do about it here.
1642 * [Note - this can occur if the drive is hot unplugged]
1644 spin_unlock_irqrestore(&ide_lock
, flags
);
1647 if (!drive_is_ready(drive
)) {
1649 * This happens regularly when we share a PCI IRQ with
1650 * another device. Unfortunately, it can also happen
1651 * with some buggy drives that trigger the IRQ before
1652 * their status register is up to date. Hopefully we have
1653 * enough advance overhead that the latter isn't a problem.
1655 spin_unlock_irqrestore(&ide_lock
, flags
);
1658 if (!hwgroup
->busy
) {
1659 hwgroup
->busy
= 1; /* paranoia */
1660 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1662 hwgroup
->handler
= NULL
;
1664 del_timer(&hwgroup
->timer
);
1665 spin_unlock(&ide_lock
);
1667 /* Some controllers might set DMA INTR no matter DMA or PIO;
1668 * bmdma status might need to be cleared even for
1669 * PIO interrupts to prevent spurious/lost irq.
1671 if (hwif
->ide_dma_clear_irq
&& !(drive
->waiting_for_dma
))
1672 /* ide_dma_end() needs bmdma status for error checking.
1673 * So, skip clearing bmdma status here and leave it
1674 * to ide_dma_end() if this is dma interrupt.
1676 hwif
->ide_dma_clear_irq(drive
);
1679 local_irq_enable_in_hardirq();
1680 /* service this interrupt, may set handler for next interrupt */
1681 startstop
= handler(drive
);
1682 spin_lock_irq(&ide_lock
);
1685 * Note that handler() may have set things up for another
1686 * interrupt to occur soon, but it cannot happen until
1687 * we exit from this routine, because it will be the
1688 * same irq as is currently being serviced here, and Linux
1689 * won't allow another of the same (on any CPU) until we return.
1691 drive
->service_time
= jiffies
- drive
->service_start
;
1692 if (startstop
== ide_stopped
) {
1693 if (hwgroup
->handler
== NULL
) { /* paranoia */
1695 ide_do_request(hwgroup
, hwif
->irq
);
1697 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1698 "on exit\n", drive
->name
);
1701 spin_unlock_irqrestore(&ide_lock
, flags
);
1706 * ide_init_drive_cmd - initialize a drive command request
1707 * @rq: request object
1709 * Initialize a request before we fill it in and send it down to
1710 * ide_do_drive_cmd. Commands must be set up by this function. Right
1711 * now it doesn't do a lot, but if that changes abusers will have a
1715 void ide_init_drive_cmd (struct request
*rq
)
1717 memset(rq
, 0, sizeof(*rq
));
1718 rq
->cmd_type
= REQ_TYPE_ATA_CMD
;
1722 EXPORT_SYMBOL(ide_init_drive_cmd
);
1725 * ide_do_drive_cmd - issue IDE special command
1726 * @drive: device to issue command
1727 * @rq: request to issue
1728 * @action: action for processing
1730 * This function issues a special IDE device request
1731 * onto the request queue.
1733 * If action is ide_wait, then the rq is queued at the end of the
1734 * request queue, and the function sleeps until it has been processed.
1735 * This is for use when invoked from an ioctl handler.
1737 * If action is ide_preempt, then the rq is queued at the head of
1738 * the request queue, displacing the currently-being-processed
1739 * request and this function returns immediately without waiting
1740 * for the new rq to be completed. This is VERY DANGEROUS, and is
1741 * intended for careful use by the ATAPI tape/cdrom driver code.
1743 * If action is ide_end, then the rq is queued at the end of the
1744 * request queue, and the function returns immediately without waiting
1745 * for the new rq to be completed. This is again intended for careful
1746 * use by the ATAPI tape/cdrom driver code.
1749 int ide_do_drive_cmd (ide_drive_t
*drive
, struct request
*rq
, ide_action_t action
)
1751 unsigned long flags
;
1752 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1753 DECLARE_COMPLETION_ONSTACK(wait
);
1754 int where
= ELEVATOR_INSERT_BACK
, err
;
1755 int must_wait
= (action
== ide_wait
|| action
== ide_head_wait
);
1760 * we need to hold an extra reference to request for safe inspection
1765 rq
->end_io_data
= &wait
;
1766 rq
->end_io
= blk_end_sync_rq
;
1769 spin_lock_irqsave(&ide_lock
, flags
);
1770 if (action
== ide_preempt
)
1772 if (action
== ide_preempt
|| action
== ide_head_wait
) {
1773 where
= ELEVATOR_INSERT_FRONT
;
1774 rq
->cmd_flags
|= REQ_PREEMPT
;
1776 __elv_add_request(drive
->queue
, rq
, where
, 0);
1777 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1778 spin_unlock_irqrestore(&ide_lock
, flags
);
1782 wait_for_completion(&wait
);
1786 blk_put_request(rq
);
1792 EXPORT_SYMBOL(ide_do_drive_cmd
);