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>
50 #include <linux/bitops.h>
52 #include <asm/byteorder.h>
54 #include <asm/uaccess.h>
57 static int __ide_end_request(ide_drive_t
*drive
, struct request
*rq
,
58 int uptodate
, unsigned int nr_bytes
, int dequeue
)
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
);
84 if (!list_empty(&rq
->queuelist
))
85 blkdev_dequeue_request(rq
);
86 HWGROUP(drive
)->rq
= NULL
;
88 end_that_request_last(rq
, uptodate
);
96 * ide_end_request - complete an IDE I/O
97 * @drive: IDE device for the I/O
99 * @nr_sectors: number of sectors completed
101 * This is our end_request wrapper function. We complete the I/O
102 * update random number input and dequeue the request, which if
103 * it was tagged may be out of order.
106 int ide_end_request (ide_drive_t
*drive
, int uptodate
, int nr_sectors
)
108 unsigned int nr_bytes
= nr_sectors
<< 9;
114 * room for locking improvements here, the calls below don't
115 * need the queue lock held at all
117 spin_lock_irqsave(&ide_lock
, flags
);
118 rq
= HWGROUP(drive
)->rq
;
121 if (blk_pc_request(rq
))
122 nr_bytes
= rq
->data_len
;
124 nr_bytes
= rq
->hard_cur_sectors
<< 9;
127 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_bytes
, 1);
129 spin_unlock_irqrestore(&ide_lock
, flags
);
132 EXPORT_SYMBOL(ide_end_request
);
135 * Power Management state machine. This one is rather trivial for now,
136 * we should probably add more, like switching back to PIO on suspend
137 * to help some BIOSes, re-do the door locking on resume, etc...
141 ide_pm_flush_cache
= ide_pm_state_start_suspend
,
144 idedisk_pm_restore_pio
= ide_pm_state_start_resume
,
149 static void ide_complete_power_step(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 error
)
151 struct request_pm_state
*pm
= rq
->data
;
153 if (drive
->media
!= ide_disk
)
156 switch (pm
->pm_step
) {
157 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) complete */
158 if (pm
->pm_state
== PM_EVENT_FREEZE
)
159 pm
->pm_step
= ide_pm_state_completed
;
161 pm
->pm_step
= idedisk_pm_standby
;
163 case idedisk_pm_standby
: /* Suspend step 2 (standby) complete */
164 pm
->pm_step
= ide_pm_state_completed
;
166 case idedisk_pm_restore_pio
: /* Resume step 1 complete */
167 pm
->pm_step
= idedisk_pm_idle
;
169 case idedisk_pm_idle
: /* Resume step 2 (idle) complete */
170 pm
->pm_step
= ide_pm_restore_dma
;
175 static ide_startstop_t
ide_start_power_step(ide_drive_t
*drive
, struct request
*rq
)
177 struct request_pm_state
*pm
= rq
->data
;
178 ide_task_t
*args
= rq
->special
;
180 memset(args
, 0, sizeof(*args
));
182 switch (pm
->pm_step
) {
183 case ide_pm_flush_cache
: /* Suspend step 1 (flush cache) */
184 if (drive
->media
!= ide_disk
)
186 /* Not supported? Switch to next step now. */
187 if (!drive
->wcache
|| !ide_id_has_flush_cache(drive
->id
)) {
188 ide_complete_power_step(drive
, rq
, 0, 0);
191 if (ide_id_has_flush_cache_ext(drive
->id
))
192 args
->tf
.command
= WIN_FLUSH_CACHE_EXT
;
194 args
->tf
.command
= WIN_FLUSH_CACHE
;
197 case idedisk_pm_standby
: /* Suspend step 2 (standby) */
198 args
->tf
.command
= WIN_STANDBYNOW1
;
201 case idedisk_pm_restore_pio
: /* Resume step 1 (restore PIO) */
202 ide_set_max_pio(drive
);
204 * skip idedisk_pm_idle for ATAPI devices
206 if (drive
->media
!= ide_disk
)
207 pm
->pm_step
= ide_pm_restore_dma
;
209 ide_complete_power_step(drive
, rq
, 0, 0);
212 case idedisk_pm_idle
: /* Resume step 2 (idle) */
213 args
->tf
.command
= WIN_IDLEIMMEDIATE
;
216 case ide_pm_restore_dma
: /* Resume step 3 (restore DMA) */
218 * Right now, all we do is call ide_set_dma(drive),
219 * we could be smarter and check for current xfer_speed
220 * in struct drive etc...
222 if (drive
->hwif
->ide_dma_on
== NULL
)
224 drive
->hwif
->dma_off_quietly(drive
);
226 * TODO: respect ->using_dma setting
231 pm
->pm_step
= ide_pm_state_completed
;
235 args
->tf_flags
= IDE_TFLAG_OUT_TF
;
236 if (drive
->addressing
== 1)
237 args
->tf_flags
|= (IDE_TFLAG_LBA48
| IDE_TFLAG_OUT_HOB
);
238 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
239 args
->handler
= task_no_data_intr
;
240 return do_rw_taskfile(drive
, args
);
244 * ide_end_dequeued_request - complete an IDE I/O
245 * @drive: IDE device for the I/O
247 * @nr_sectors: number of sectors completed
249 * Complete an I/O that is no longer on the request queue. This
250 * typically occurs when we pull the request and issue a REQUEST_SENSE.
251 * We must still finish the old request but we must not tamper with the
252 * queue in the meantime.
254 * NOTE: This path does not handle barrier, but barrier is not supported
258 int ide_end_dequeued_request(ide_drive_t
*drive
, struct request
*rq
,
259 int uptodate
, int nr_sectors
)
264 spin_lock_irqsave(&ide_lock
, flags
);
265 BUG_ON(!blk_rq_started(rq
));
266 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_sectors
<< 9, 0);
267 spin_unlock_irqrestore(&ide_lock
, flags
);
271 EXPORT_SYMBOL_GPL(ide_end_dequeued_request
);
275 * ide_complete_pm_request - end the current Power Management request
276 * @drive: target drive
279 * This function cleans up the current PM request and stops the queue
282 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
287 printk("%s: completing PM request, %s\n", drive
->name
,
288 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
290 spin_lock_irqsave(&ide_lock
, flags
);
291 if (blk_pm_suspend_request(rq
)) {
292 blk_stop_queue(drive
->queue
);
295 blk_start_queue(drive
->queue
);
297 blkdev_dequeue_request(rq
);
298 HWGROUP(drive
)->rq
= NULL
;
299 end_that_request_last(rq
, 1);
300 spin_unlock_irqrestore(&ide_lock
, flags
);
304 * ide_end_drive_cmd - end an explicit drive command
309 * Clean up after success/failure of an explicit drive command.
310 * These get thrown onto the queue so they are synchronized with
311 * real I/O operations on the drive.
313 * In LBA48 mode we have to read the register set twice to get
314 * all the extra information out.
317 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
319 ide_hwif_t
*hwif
= HWIF(drive
);
323 spin_lock_irqsave(&ide_lock
, flags
);
324 rq
= HWGROUP(drive
)->rq
;
325 spin_unlock_irqrestore(&ide_lock
, flags
);
327 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
328 u8
*args
= (u8
*) rq
->buffer
;
330 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
335 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
337 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
338 u8
*args
= (u8
*) rq
->buffer
;
340 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
345 /* be sure we're looking at the low order bits */
346 hwif
->OUTB(drive
->ctl
& ~0x80, IDE_CONTROL_REG
);
347 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
348 args
[3] = hwif
->INB(IDE_SECTOR_REG
);
349 args
[4] = hwif
->INB(IDE_LCYL_REG
);
350 args
[5] = hwif
->INB(IDE_HCYL_REG
);
351 args
[6] = hwif
->INB(IDE_SELECT_REG
);
353 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
354 ide_task_t
*args
= (ide_task_t
*) rq
->special
;
356 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
359 struct ide_taskfile
*tf
= &args
->tf
;
361 if (args
->tf_in_flags
.b
.data
) {
362 u16 data
= hwif
->INW(IDE_DATA_REG
);
364 tf
->data
= data
& 0xff;
365 tf
->hob_data
= (data
>> 8) & 0xff;
368 /* be sure we're looking at the low order bits */
369 hwif
->OUTB(drive
->ctl
& ~0x80, IDE_CONTROL_REG
);
370 tf
->nsect
= hwif
->INB(IDE_NSECTOR_REG
);
371 tf
->lbal
= hwif
->INB(IDE_SECTOR_REG
);
372 tf
->lbam
= hwif
->INB(IDE_LCYL_REG
);
373 tf
->lbah
= hwif
->INB(IDE_HCYL_REG
);
374 tf
->device
= hwif
->INB(IDE_SELECT_REG
);
377 if (drive
->addressing
== 1) {
378 hwif
->OUTB(drive
->ctl
|0x80, IDE_CONTROL_REG
);
379 tf
->hob_feature
= hwif
->INB(IDE_FEATURE_REG
);
380 tf
->hob_nsect
= hwif
->INB(IDE_NSECTOR_REG
);
381 tf
->hob_lbal
= hwif
->INB(IDE_SECTOR_REG
);
382 tf
->hob_lbam
= hwif
->INB(IDE_LCYL_REG
);
383 tf
->hob_lbah
= hwif
->INB(IDE_HCYL_REG
);
386 } else if (blk_pm_request(rq
)) {
387 struct request_pm_state
*pm
= rq
->data
;
389 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
390 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
392 ide_complete_power_step(drive
, rq
, stat
, err
);
393 if (pm
->pm_step
== ide_pm_state_completed
)
394 ide_complete_pm_request(drive
, rq
);
398 spin_lock_irqsave(&ide_lock
, flags
);
399 blkdev_dequeue_request(rq
);
400 HWGROUP(drive
)->rq
= NULL
;
402 end_that_request_last(rq
, !rq
->errors
);
403 spin_unlock_irqrestore(&ide_lock
, flags
);
406 EXPORT_SYMBOL(ide_end_drive_cmd
);
409 * try_to_flush_leftover_data - flush junk
410 * @drive: drive to flush
412 * try_to_flush_leftover_data() is invoked in response to a drive
413 * unexpectedly having its DRQ_STAT bit set. As an alternative to
414 * resetting the drive, this routine tries to clear the condition
415 * by read a sector's worth of data from the drive. Of course,
416 * this may not help if the drive is *waiting* for data from *us*.
418 static void try_to_flush_leftover_data (ide_drive_t
*drive
)
420 int i
= (drive
->mult_count
? drive
->mult_count
: 1) * SECTOR_WORDS
;
422 if (drive
->media
!= ide_disk
)
426 u32 wcount
= (i
> 16) ? 16 : i
;
429 HWIF(drive
)->ata_input_data(drive
, buffer
, wcount
);
433 static void ide_kill_rq(ide_drive_t
*drive
, struct request
*rq
)
438 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
439 drv
->end_request(drive
, 0, 0);
441 ide_end_request(drive
, 0, 0);
444 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
446 ide_hwif_t
*hwif
= drive
->hwif
;
448 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
449 /* other bits are useless when BUSY */
450 rq
->errors
|= ERROR_RESET
;
451 } else if (stat
& ERR_STAT
) {
452 /* err has different meaning on cdrom and tape */
453 if (err
== ABRT_ERR
) {
454 if (drive
->select
.b
.lba
&&
455 /* some newer drives don't support WIN_SPECIFY */
456 hwif
->INB(IDE_COMMAND_REG
) == WIN_SPECIFY
)
458 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
459 /* UDMA crc error, just retry the operation */
461 } else if (err
& (BBD_ERR
| ECC_ERR
)) {
462 /* retries won't help these */
463 rq
->errors
= ERROR_MAX
;
464 } else if (err
& TRK0_ERR
) {
465 /* help it find track zero */
466 rq
->errors
|= ERROR_RECAL
;
470 if ((stat
& DRQ_STAT
) && rq_data_dir(rq
) == READ
&&
471 (hwif
->host_flags
& IDE_HFLAG_ERROR_STOPS_FIFO
) == 0)
472 try_to_flush_leftover_data(drive
);
474 if (rq
->errors
>= ERROR_MAX
|| blk_noretry_request(rq
)) {
475 ide_kill_rq(drive
, rq
);
479 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
480 rq
->errors
|= ERROR_RESET
;
482 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
484 return ide_do_reset(drive
);
487 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
488 drive
->special
.b
.recalibrate
= 1;
495 static ide_startstop_t
ide_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
497 ide_hwif_t
*hwif
= drive
->hwif
;
499 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
500 /* other bits are useless when BUSY */
501 rq
->errors
|= ERROR_RESET
;
503 /* add decoding error stuff */
506 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
508 hwif
->OUTB(WIN_IDLEIMMEDIATE
, IDE_COMMAND_REG
);
510 if (rq
->errors
>= ERROR_MAX
) {
511 ide_kill_rq(drive
, rq
);
513 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
515 return ide_do_reset(drive
);
524 __ide_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
526 if (drive
->media
== ide_disk
)
527 return ide_ata_error(drive
, rq
, stat
, err
);
528 return ide_atapi_error(drive
, rq
, stat
, err
);
531 EXPORT_SYMBOL_GPL(__ide_error
);
534 * ide_error - handle an error on the IDE
535 * @drive: drive the error occurred on
536 * @msg: message to report
539 * ide_error() takes action based on the error returned by the drive.
540 * For normal I/O that may well include retries. We deal with
541 * both new-style (taskfile) and old style command handling here.
542 * In the case of taskfile command handling there is work left to
546 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
551 err
= ide_dump_status(drive
, msg
, stat
);
553 if ((rq
= HWGROUP(drive
)->rq
) == NULL
)
556 /* retry only "normal" I/O: */
557 if (!blk_fs_request(rq
)) {
559 ide_end_drive_cmd(drive
, stat
, err
);
566 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
567 return drv
->error(drive
, rq
, stat
, err
);
569 return __ide_error(drive
, rq
, stat
, err
);
572 EXPORT_SYMBOL_GPL(ide_error
);
574 ide_startstop_t
__ide_abort(ide_drive_t
*drive
, struct request
*rq
)
576 if (drive
->media
!= ide_disk
)
577 rq
->errors
|= ERROR_RESET
;
579 ide_kill_rq(drive
, rq
);
584 EXPORT_SYMBOL_GPL(__ide_abort
);
587 * ide_abort - abort pending IDE operations
588 * @drive: drive the error occurred on
589 * @msg: message to report
591 * ide_abort kills and cleans up when we are about to do a
592 * host initiated reset on active commands. Longer term we
593 * want handlers to have sensible abort handling themselves
595 * This differs fundamentally from ide_error because in
596 * this case the command is doing just fine when we
600 ide_startstop_t
ide_abort(ide_drive_t
*drive
, const char *msg
)
604 if (drive
== NULL
|| (rq
= HWGROUP(drive
)->rq
) == NULL
)
607 /* retry only "normal" I/O: */
608 if (!blk_fs_request(rq
)) {
610 ide_end_drive_cmd(drive
, BUSY_STAT
, 0);
617 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
618 return drv
->abort(drive
, rq
);
620 return __ide_abort(drive
, rq
);
624 * ide_cmd - issue a simple drive command
625 * @drive: drive the command is for
627 * @nsect: sector byte
628 * @handler: handler for the command completion
630 * Issue a simple drive command with interrupts.
631 * The drive must be selected beforehand.
634 static void ide_cmd (ide_drive_t
*drive
, u8 cmd
, u8 nsect
,
635 ide_handler_t
*handler
)
637 ide_hwif_t
*hwif
= HWIF(drive
);
639 hwif
->OUTB(drive
->ctl
,IDE_CONTROL_REG
); /* clear nIEN */
640 SELECT_MASK(drive
,0);
641 hwif
->OUTB(nsect
,IDE_NSECTOR_REG
);
642 ide_execute_command(drive
, cmd
, handler
, WAIT_CMD
, NULL
);
646 * drive_cmd_intr - drive command completion interrupt
647 * @drive: drive the completion interrupt occurred on
649 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
650 * We do any necessary data reading and then wait for the drive to
651 * go non busy. At that point we may read the error data and complete
655 static ide_startstop_t
drive_cmd_intr (ide_drive_t
*drive
)
657 struct request
*rq
= HWGROUP(drive
)->rq
;
658 ide_hwif_t
*hwif
= HWIF(drive
);
659 u8
*args
= (u8
*) rq
->buffer
;
660 u8 stat
= hwif
->INB(IDE_STATUS_REG
);
663 local_irq_enable_in_hardirq();
664 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
&&
665 (stat
& DRQ_STAT
) && args
&& args
[3]) {
666 u8 io_32bit
= drive
->io_32bit
;
668 hwif
->ata_input_data(drive
, &args
[4], args
[3] * SECTOR_WORDS
);
669 drive
->io_32bit
= io_32bit
;
670 while (((stat
= hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) && retries
--)
674 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
))
675 return ide_error(drive
, "drive_cmd", stat
);
676 /* calls ide_end_drive_cmd */
677 ide_end_drive_cmd(drive
, stat
, hwif
->INB(IDE_ERROR_REG
));
681 static void ide_init_specify_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
683 task
->tf
.nsect
= drive
->sect
;
684 task
->tf
.lbal
= drive
->sect
;
685 task
->tf
.lbam
= drive
->cyl
;
686 task
->tf
.lbah
= drive
->cyl
>> 8;
687 task
->tf
.device
= ((drive
->head
- 1) | drive
->select
.all
) & ~ATA_LBA
;
688 task
->tf
.command
= WIN_SPECIFY
;
690 task
->handler
= &set_geometry_intr
;
693 static void ide_init_restore_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
695 task
->tf
.nsect
= drive
->sect
;
696 task
->tf
.command
= WIN_RESTORE
;
698 task
->handler
= &recal_intr
;
701 static void ide_init_setmult_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
703 task
->tf
.nsect
= drive
->mult_req
;
704 task
->tf
.command
= WIN_SETMULT
;
706 task
->handler
= &set_multmode_intr
;
709 static ide_startstop_t
ide_disk_special(ide_drive_t
*drive
)
711 special_t
*s
= &drive
->special
;
714 memset(&args
, 0, sizeof(ide_task_t
));
715 args
.command_type
= IDE_DRIVE_TASK_NO_DATA
;
717 if (s
->b
.set_geometry
) {
718 s
->b
.set_geometry
= 0;
719 ide_init_specify_cmd(drive
, &args
);
720 } else if (s
->b
.recalibrate
) {
721 s
->b
.recalibrate
= 0;
722 ide_init_restore_cmd(drive
, &args
);
723 } else if (s
->b
.set_multmode
) {
724 s
->b
.set_multmode
= 0;
725 if (drive
->mult_req
> drive
->id
->max_multsect
)
726 drive
->mult_req
= drive
->id
->max_multsect
;
727 ide_init_setmult_cmd(drive
, &args
);
729 int special
= s
->all
;
731 printk(KERN_ERR
"%s: bad special flag: 0x%02x\n", drive
->name
, special
);
735 args
.tf_flags
= IDE_TFLAG_OUT_TF
;
736 if (drive
->addressing
== 1)
737 args
.tf_flags
|= (IDE_TFLAG_LBA48
| IDE_TFLAG_OUT_HOB
);
739 do_rw_taskfile(drive
, &args
);
745 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
747 static int set_pio_mode_abuse(ide_hwif_t
*hwif
, u8 req_pio
)
756 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_DMA_MODES
) ? 1 : 0;
759 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_PREFETCH
) ? 1 : 0;
762 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_FAST_DEVSEL
) ? 1 : 0;
769 * do_special - issue some special commands
770 * @drive: drive the command is for
772 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
773 * commands to a drive. It used to do much more, but has been scaled
777 static ide_startstop_t
do_special (ide_drive_t
*drive
)
779 special_t
*s
= &drive
->special
;
782 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
785 ide_hwif_t
*hwif
= drive
->hwif
;
786 u8 req_pio
= drive
->tune_req
;
790 if (set_pio_mode_abuse(drive
->hwif
, req_pio
)) {
792 if (hwif
->set_pio_mode
== NULL
)
796 * take ide_lock for drive->[no_]unmask/[no_]io_32bit
798 if (req_pio
== 8 || req_pio
== 9) {
801 spin_lock_irqsave(&ide_lock
, flags
);
802 hwif
->set_pio_mode(drive
, req_pio
);
803 spin_unlock_irqrestore(&ide_lock
, flags
);
805 hwif
->set_pio_mode(drive
, req_pio
);
807 int keep_dma
= drive
->using_dma
;
809 ide_set_pio(drive
, req_pio
);
811 if (hwif
->host_flags
& IDE_HFLAG_SET_PIO_MODE_KEEP_DMA
) {
813 hwif
->ide_dma_on(drive
);
819 if (drive
->media
== ide_disk
)
820 return ide_disk_special(drive
);
828 void ide_map_sg(ide_drive_t
*drive
, struct request
*rq
)
830 ide_hwif_t
*hwif
= drive
->hwif
;
831 struct scatterlist
*sg
= hwif
->sg_table
;
833 if (hwif
->sg_mapped
) /* needed by ide-scsi */
836 if (rq
->cmd_type
!= REQ_TYPE_ATA_TASKFILE
) {
837 hwif
->sg_nents
= blk_rq_map_sg(drive
->queue
, rq
, sg
);
839 sg_init_one(sg
, rq
->buffer
, rq
->nr_sectors
* SECTOR_SIZE
);
844 EXPORT_SYMBOL_GPL(ide_map_sg
);
846 void ide_init_sg_cmd(ide_drive_t
*drive
, struct request
*rq
)
848 ide_hwif_t
*hwif
= drive
->hwif
;
850 hwif
->nsect
= hwif
->nleft
= rq
->nr_sectors
;
855 EXPORT_SYMBOL_GPL(ide_init_sg_cmd
);
858 * execute_drive_command - issue special drive command
859 * @drive: the drive to issue the command on
860 * @rq: the request structure holding the command
862 * execute_drive_cmd() issues a special drive command, usually
863 * initiated by ioctl() from the external hdparm program. The
864 * command can be a drive command, drive task or taskfile
865 * operation. Weirdly you can call it with NULL to wait for
866 * all commands to finish. Don't do this as that is due to change
869 static ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
,
872 ide_hwif_t
*hwif
= HWIF(drive
);
873 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
874 ide_task_t
*args
= rq
->special
;
879 hwif
->data_phase
= args
->data_phase
;
881 switch (hwif
->data_phase
) {
882 case TASKFILE_MULTI_OUT
:
884 case TASKFILE_MULTI_IN
:
886 ide_init_sg_cmd(drive
, rq
);
887 ide_map_sg(drive
, rq
);
892 if (args
->tf_flags
& IDE_TFLAG_FLAGGED
)
893 return flagged_taskfile(drive
, args
);
895 args
->tf_flags
|= IDE_TFLAG_OUT_TF
;
896 if (drive
->addressing
== 1)
897 args
->tf_flags
|= (IDE_TFLAG_LBA48
| IDE_TFLAG_OUT_HOB
);
899 return do_rw_taskfile(drive
, args
);
900 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
901 u8
*args
= rq
->buffer
;
906 printk("%s: DRIVE_TASK_CMD ", drive
->name
);
907 printk("cmd=0x%02x ", args
[0]);
908 printk("fr=0x%02x ", args
[1]);
909 printk("ns=0x%02x ", args
[2]);
910 printk("sc=0x%02x ", args
[3]);
911 printk("lcyl=0x%02x ", args
[4]);
912 printk("hcyl=0x%02x ", args
[5]);
913 printk("sel=0x%02x\n", args
[6]);
915 hwif
->OUTB(args
[1], IDE_FEATURE_REG
);
916 hwif
->OUTB(args
[3], IDE_SECTOR_REG
);
917 hwif
->OUTB(args
[4], IDE_LCYL_REG
);
918 hwif
->OUTB(args
[5], IDE_HCYL_REG
);
919 hwif
->OUTB((args
[6] & 0xEF)|drive
->select
.all
, IDE_SELECT_REG
);
920 ide_cmd(drive
, args
[0], args
[2], &drive_cmd_intr
);
922 } else if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
923 u8
*args
= rq
->buffer
;
928 printk("%s: DRIVE_CMD ", drive
->name
);
929 printk("cmd=0x%02x ", args
[0]);
930 printk("sc=0x%02x ", args
[1]);
931 printk("fr=0x%02x ", args
[2]);
932 printk("xx=0x%02x\n", args
[3]);
934 if (args
[0] == WIN_SMART
) {
935 hwif
->OUTB(0x4f, IDE_LCYL_REG
);
936 hwif
->OUTB(0xc2, IDE_HCYL_REG
);
937 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
938 hwif
->OUTB(args
[1],IDE_SECTOR_REG
);
939 ide_cmd(drive
, args
[0], args
[3], &drive_cmd_intr
);
942 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
943 ide_cmd(drive
, args
[0], args
[1], &drive_cmd_intr
);
949 * NULL is actually a valid way of waiting for
950 * all current requests to be flushed from the queue.
953 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
955 ide_end_drive_cmd(drive
,
956 hwif
->INB(IDE_STATUS_REG
),
957 hwif
->INB(IDE_ERROR_REG
));
961 static void ide_check_pm_state(ide_drive_t
*drive
, struct request
*rq
)
963 struct request_pm_state
*pm
= rq
->data
;
965 if (blk_pm_suspend_request(rq
) &&
966 pm
->pm_step
== ide_pm_state_start_suspend
)
967 /* Mark drive blocked when starting the suspend sequence. */
969 else if (blk_pm_resume_request(rq
) &&
970 pm
->pm_step
== ide_pm_state_start_resume
) {
972 * The first thing we do on wakeup is to wait for BSY bit to
973 * go away (with a looong timeout) as a drive on this hwif may
974 * just be POSTing itself.
975 * We do that before even selecting as the "other" device on
976 * the bus may be broken enough to walk on our toes at this
981 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
983 rc
= ide_wait_not_busy(HWIF(drive
), 35000);
985 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
988 HWIF(drive
)->OUTB(drive
->ctl
, IDE_CONTROL_REG
);
989 rc
= ide_wait_not_busy(HWIF(drive
), 100000);
991 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
996 * start_request - start of I/O and command issuing for IDE
998 * start_request() initiates handling of a new I/O request. It
999 * accepts commands and I/O (read/write) requests. It also does
1000 * the final remapping for weird stuff like EZDrive. Once
1001 * device mapper can work sector level the EZDrive stuff can go away
1003 * FIXME: this function needs a rename
1006 static ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
1008 ide_startstop_t startstop
;
1011 BUG_ON(!blk_rq_started(rq
));
1014 printk("%s: start_request: current=0x%08lx\n",
1015 HWIF(drive
)->name
, (unsigned long) rq
);
1018 /* bail early if we've exceeded max_failures */
1019 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
1020 rq
->cmd_flags
|= REQ_FAILED
;
1025 if (blk_fs_request(rq
) &&
1026 (drive
->media
== ide_disk
|| drive
->media
== ide_floppy
)) {
1027 block
+= drive
->sect0
;
1029 /* Yecch - this will shift the entire interval,
1030 possibly killing some innocent following sector */
1031 if (block
== 0 && drive
->remap_0_to_1
== 1)
1032 block
= 1; /* redirect MBR access to EZ-Drive partn table */
1034 if (blk_pm_request(rq
))
1035 ide_check_pm_state(drive
, rq
);
1037 SELECT_DRIVE(drive
);
1038 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
, BUSY_STAT
|DRQ_STAT
, WAIT_READY
)) {
1039 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
1042 if (!drive
->special
.all
) {
1046 * We reset the drive so we need to issue a SETFEATURES.
1047 * Do it _after_ do_special() restored device parameters.
1049 if (drive
->current_speed
== 0xff)
1050 ide_config_drive_speed(drive
, drive
->desired_speed
);
1052 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
||
1053 rq
->cmd_type
== REQ_TYPE_ATA_TASK
||
1054 rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
)
1055 return execute_drive_cmd(drive
, rq
);
1056 else if (blk_pm_request(rq
)) {
1057 struct request_pm_state
*pm
= rq
->data
;
1059 printk("%s: start_power_step(step: %d)\n",
1060 drive
->name
, rq
->pm
->pm_step
);
1062 startstop
= ide_start_power_step(drive
, rq
);
1063 if (startstop
== ide_stopped
&&
1064 pm
->pm_step
== ide_pm_state_completed
)
1065 ide_complete_pm_request(drive
, rq
);
1069 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
1070 return drv
->do_request(drive
, rq
, block
);
1072 return do_special(drive
);
1074 ide_kill_rq(drive
, rq
);
1079 * ide_stall_queue - pause an IDE device
1080 * @drive: drive to stall
1081 * @timeout: time to stall for (jiffies)
1083 * ide_stall_queue() can be used by a drive to give excess bandwidth back
1084 * to the hwgroup by sleeping for timeout jiffies.
1087 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
1089 if (timeout
> WAIT_WORSTCASE
)
1090 timeout
= WAIT_WORSTCASE
;
1091 drive
->sleep
= timeout
+ jiffies
;
1092 drive
->sleeping
= 1;
1095 EXPORT_SYMBOL(ide_stall_queue
);
1097 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
1100 * choose_drive - select a drive to service
1101 * @hwgroup: hardware group to select on
1103 * choose_drive() selects the next drive which will be serviced.
1104 * This is necessary because the IDE layer can't issue commands
1105 * to both drives on the same cable, unlike SCSI.
1108 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
1110 ide_drive_t
*drive
, *best
;
1114 drive
= hwgroup
->drive
;
1117 * drive is doing pre-flush, ordered write, post-flush sequence. even
1118 * though that is 3 requests, it must be seen as a single transaction.
1119 * we must not preempt this drive until that is complete
1121 if (blk_queue_flushing(drive
->queue
)) {
1123 * small race where queue could get replugged during
1124 * the 3-request flush cycle, just yank the plug since
1125 * we want it to finish asap
1127 blk_remove_plug(drive
->queue
);
1132 if ((!drive
->sleeping
|| time_after_eq(jiffies
, drive
->sleep
))
1133 && !elv_queue_empty(drive
->queue
)) {
1135 || (drive
->sleeping
&& (!best
->sleeping
|| time_before(drive
->sleep
, best
->sleep
)))
1136 || (!best
->sleeping
&& time_before(WAKEUP(drive
), WAKEUP(best
))))
1138 if (!blk_queue_plugged(drive
->queue
))
1142 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1143 if (best
&& best
->nice1
&& !best
->sleeping
&& best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
1144 long t
= (signed long)(WAKEUP(best
) - jiffies
);
1145 if (t
>= WAIT_MIN_SLEEP
) {
1147 * We *may* have some time to spare, but first let's see if
1148 * someone can potentially benefit from our nice mood today..
1152 if (!drive
->sleeping
1153 && time_before(jiffies
- best
->service_time
, WAKEUP(drive
))
1154 && time_before(WAKEUP(drive
), jiffies
+ t
))
1156 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
1159 } while ((drive
= drive
->next
) != best
);
1166 * Issue a new request to a drive from hwgroup
1167 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
1169 * A hwgroup is a serialized group of IDE interfaces. Usually there is
1170 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
1171 * may have both interfaces in a single hwgroup to "serialize" access.
1172 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
1173 * together into one hwgroup for serialized access.
1175 * Note also that several hwgroups can end up sharing a single IRQ,
1176 * possibly along with many other devices. This is especially common in
1177 * PCI-based systems with off-board IDE controller cards.
1179 * The IDE driver uses the single global ide_lock spinlock to protect
1180 * access to the request queues, and to protect the hwgroup->busy flag.
1182 * The first thread into the driver for a particular hwgroup sets the
1183 * hwgroup->busy flag to indicate that this hwgroup is now active,
1184 * and then initiates processing of the top request from the request queue.
1186 * Other threads attempting entry notice the busy setting, and will simply
1187 * queue their new requests and exit immediately. Note that hwgroup->busy
1188 * remains set even when the driver is merely awaiting the next interrupt.
1189 * Thus, the meaning is "this hwgroup is busy processing a request".
1191 * When processing of a request completes, the completing thread or IRQ-handler
1192 * will start the next request from the queue. If no more work remains,
1193 * the driver will clear the hwgroup->busy flag and exit.
1195 * The ide_lock (spinlock) is used to protect all access to the
1196 * hwgroup->busy flag, but is otherwise not needed for most processing in
1197 * the driver. This makes the driver much more friendlier to shared IRQs
1198 * than previous designs, while remaining 100% (?) SMP safe and capable.
1200 static void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
1205 ide_startstop_t startstop
;
1208 /* for atari only: POSSIBLY BROKEN HERE(?) */
1209 ide_get_lock(ide_intr
, hwgroup
);
1211 /* caller must own ide_lock */
1212 BUG_ON(!irqs_disabled());
1214 while (!hwgroup
->busy
) {
1216 drive
= choose_drive(hwgroup
);
1217 if (drive
== NULL
) {
1219 unsigned long sleep
= 0; /* shut up, gcc */
1221 drive
= hwgroup
->drive
;
1223 if (drive
->sleeping
&& (!sleeping
|| time_before(drive
->sleep
, sleep
))) {
1225 sleep
= drive
->sleep
;
1227 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1230 * Take a short snooze, and then wake up this hwgroup again.
1231 * This gives other hwgroups on the same a chance to
1232 * play fairly with us, just in case there are big differences
1233 * in relative throughputs.. don't want to hog the cpu too much.
1235 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
1236 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
1238 if (timer_pending(&hwgroup
->timer
))
1239 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
1241 /* so that ide_timer_expiry knows what to do */
1242 hwgroup
->sleeping
= 1;
1243 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1244 mod_timer(&hwgroup
->timer
, sleep
);
1245 /* we purposely leave hwgroup->busy==1
1248 /* Ugly, but how can we sleep for the lock
1249 * otherwise? perhaps from tq_disk?
1252 /* for atari only */
1257 /* no more work for this hwgroup (for now) */
1262 if (hwgroup
->hwif
->sharing_irq
&&
1263 hwif
!= hwgroup
->hwif
&&
1264 hwif
->io_ports
[IDE_CONTROL_OFFSET
]) {
1265 /* set nIEN for previous hwif */
1266 SELECT_INTERRUPT(drive
);
1268 hwgroup
->hwif
= hwif
;
1269 hwgroup
->drive
= drive
;
1270 drive
->sleeping
= 0;
1271 drive
->service_start
= jiffies
;
1273 if (blk_queue_plugged(drive
->queue
)) {
1274 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1279 * we know that the queue isn't empty, but this can happen
1280 * if the q->prep_rq_fn() decides to kill a request
1282 rq
= elv_next_request(drive
->queue
);
1289 * Sanity: don't accept a request that isn't a PM request
1290 * if we are currently power managed. This is very important as
1291 * blk_stop_queue() doesn't prevent the elv_next_request()
1292 * above to return us whatever is in the queue. Since we call
1293 * ide_do_request() ourselves, we end up taking requests while
1294 * the queue is blocked...
1296 * We let requests forced at head of queue with ide-preempt
1297 * though. I hope that doesn't happen too much, hopefully not
1298 * unless the subdriver triggers such a thing in its own PM
1301 * We count how many times we loop here to make sure we service
1302 * all drives in the hwgroup without looping for ever
1304 if (drive
->blocked
&& !blk_pm_request(rq
) && !(rq
->cmd_flags
& REQ_PREEMPT
)) {
1305 drive
= drive
->next
? drive
->next
: hwgroup
->drive
;
1306 if (loops
++ < 4 && !blk_queue_plugged(drive
->queue
))
1308 /* We clear busy, there should be no pending ATA command at this point. */
1316 * Some systems have trouble with IDE IRQs arriving while
1317 * the driver is still setting things up. So, here we disable
1318 * the IRQ used by this interface while the request is being started.
1319 * This may look bad at first, but pretty much the same thing
1320 * happens anyway when any interrupt comes in, IDE or otherwise
1321 * -- the kernel masks the IRQ while it is being handled.
1323 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1324 disable_irq_nosync(hwif
->irq
);
1325 spin_unlock(&ide_lock
);
1326 local_irq_enable_in_hardirq();
1327 /* allow other IRQs while we start this request */
1328 startstop
= start_request(drive
, rq
);
1329 spin_lock_irq(&ide_lock
);
1330 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1331 enable_irq(hwif
->irq
);
1332 if (startstop
== ide_stopped
)
1338 * Passes the stuff to ide_do_request
1340 void do_ide_request(struct request_queue
*q
)
1342 ide_drive_t
*drive
= q
->queuedata
;
1344 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1348 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1349 * retry the current request in pio mode instead of risking tossing it
1352 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1354 ide_hwif_t
*hwif
= HWIF(drive
);
1356 ide_startstop_t ret
= ide_stopped
;
1359 * end current dma transaction
1363 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1364 (void)HWIF(drive
)->ide_dma_end(drive
);
1365 ret
= ide_error(drive
, "dma timeout error",
1366 hwif
->INB(IDE_STATUS_REG
));
1368 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1369 hwif
->dma_timeout(drive
);
1373 * disable dma for now, but remember that we did so because of
1374 * a timeout -- we'll reenable after we finish this next request
1375 * (or rather the first chunk of it) in pio.
1378 drive
->state
= DMA_PIO_RETRY
;
1379 hwif
->dma_off_quietly(drive
);
1382 * un-busy drive etc (hwgroup->busy is cleared on return) and
1383 * make sure request is sane
1385 rq
= HWGROUP(drive
)->rq
;
1390 HWGROUP(drive
)->rq
= NULL
;
1397 rq
->sector
= rq
->bio
->bi_sector
;
1398 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1399 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1400 rq
->buffer
= bio_data(rq
->bio
);
1406 * ide_timer_expiry - handle lack of an IDE interrupt
1407 * @data: timer callback magic (hwgroup)
1409 * An IDE command has timed out before the expected drive return
1410 * occurred. At this point we attempt to clean up the current
1411 * mess. If the current handler includes an expiry handler then
1412 * we invoke the expiry handler, and providing it is happy the
1413 * work is done. If that fails we apply generic recovery rules
1414 * invoking the handler and checking the drive DMA status. We
1415 * have an excessively incestuous relationship with the DMA
1416 * logic that wants cleaning up.
1419 void ide_timer_expiry (unsigned long data
)
1421 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1422 ide_handler_t
*handler
;
1423 ide_expiry_t
*expiry
;
1424 unsigned long flags
;
1425 unsigned long wait
= -1;
1427 spin_lock_irqsave(&ide_lock
, flags
);
1429 if (((handler
= hwgroup
->handler
) == NULL
) ||
1430 (hwgroup
->req_gen
!= hwgroup
->req_gen_timer
)) {
1432 * Either a marginal timeout occurred
1433 * (got the interrupt just as timer expired),
1434 * or we were "sleeping" to give other devices a chance.
1435 * Either way, we don't really want to complain about anything.
1437 if (hwgroup
->sleeping
) {
1438 hwgroup
->sleeping
= 0;
1442 ide_drive_t
*drive
= hwgroup
->drive
;
1444 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1445 hwgroup
->handler
= NULL
;
1448 ide_startstop_t startstop
= ide_stopped
;
1449 if (!hwgroup
->busy
) {
1450 hwgroup
->busy
= 1; /* paranoia */
1451 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1453 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1455 if ((wait
= expiry(drive
)) > 0) {
1457 hwgroup
->timer
.expires
= jiffies
+ wait
;
1458 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1459 add_timer(&hwgroup
->timer
);
1460 spin_unlock_irqrestore(&ide_lock
, flags
);
1464 hwgroup
->handler
= NULL
;
1466 * We need to simulate a real interrupt when invoking
1467 * the handler() function, which means we need to
1468 * globally mask the specific IRQ:
1470 spin_unlock(&ide_lock
);
1472 #if DISABLE_IRQ_NOSYNC
1473 disable_irq_nosync(hwif
->irq
);
1475 /* disable_irq_nosync ?? */
1476 disable_irq(hwif
->irq
);
1477 #endif /* DISABLE_IRQ_NOSYNC */
1479 * as if we were handling an interrupt */
1480 local_irq_disable();
1481 if (hwgroup
->polling
) {
1482 startstop
= handler(drive
);
1483 } else if (drive_is_ready(drive
)) {
1484 if (drive
->waiting_for_dma
)
1485 hwgroup
->hwif
->dma_lost_irq(drive
);
1486 (void)ide_ack_intr(hwif
);
1487 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1488 startstop
= handler(drive
);
1490 if (drive
->waiting_for_dma
) {
1491 startstop
= ide_dma_timeout_retry(drive
, wait
);
1494 ide_error(drive
, "irq timeout", hwif
->INB(IDE_STATUS_REG
));
1496 drive
->service_time
= jiffies
- drive
->service_start
;
1497 spin_lock_irq(&ide_lock
);
1498 enable_irq(hwif
->irq
);
1499 if (startstop
== ide_stopped
)
1503 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1504 spin_unlock_irqrestore(&ide_lock
, flags
);
1508 * unexpected_intr - handle an unexpected IDE interrupt
1509 * @irq: interrupt line
1510 * @hwgroup: hwgroup being processed
1512 * There's nothing really useful we can do with an unexpected interrupt,
1513 * other than reading the status register (to clear it), and logging it.
1514 * There should be no way that an irq can happen before we're ready for it,
1515 * so we needn't worry much about losing an "important" interrupt here.
1517 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1518 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1519 * looks "good", we just ignore the interrupt completely.
1521 * This routine assumes __cli() is in effect when called.
1523 * If an unexpected interrupt happens on irq15 while we are handling irq14
1524 * and if the two interfaces are "serialized" (CMD640), then it looks like
1525 * we could screw up by interfering with a new request being set up for
1528 * In reality, this is a non-issue. The new command is not sent unless
1529 * the drive is ready to accept one, in which case we know the drive is
1530 * not trying to interrupt us. And ide_set_handler() is always invoked
1531 * before completing the issuance of any new drive command, so we will not
1532 * be accidentally invoked as a result of any valid command completion
1535 * Note that we must walk the entire hwgroup here. We know which hwif
1536 * is doing the current command, but we don't know which hwif burped
1540 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1543 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1546 * handle the unexpected interrupt
1549 if (hwif
->irq
== irq
) {
1550 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1551 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
)) {
1552 /* Try to not flood the console with msgs */
1553 static unsigned long last_msgtime
, count
;
1555 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1556 last_msgtime
= jiffies
;
1557 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1558 "status=0x%02x, count=%ld\n",
1560 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1564 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1568 * ide_intr - default IDE interrupt handler
1569 * @irq: interrupt number
1570 * @dev_id: hwif group
1571 * @regs: unused weirdness from the kernel irq layer
1573 * This is the default IRQ handler for the IDE layer. You should
1574 * not need to override it. If you do be aware it is subtle in
1577 * hwgroup->hwif is the interface in the group currently performing
1578 * a command. hwgroup->drive is the drive and hwgroup->handler is
1579 * the IRQ handler to call. As we issue a command the handlers
1580 * step through multiple states, reassigning the handler to the
1581 * next step in the process. Unlike a smart SCSI controller IDE
1582 * expects the main processor to sequence the various transfer
1583 * stages. We also manage a poll timer to catch up with most
1584 * timeout situations. There are still a few where the handlers
1585 * don't ever decide to give up.
1587 * The handler eventually returns ide_stopped to indicate the
1588 * request completed. At this point we issue the next request
1589 * on the hwgroup and the process begins again.
1592 irqreturn_t
ide_intr (int irq
, void *dev_id
)
1594 unsigned long flags
;
1595 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1598 ide_handler_t
*handler
;
1599 ide_startstop_t startstop
;
1601 spin_lock_irqsave(&ide_lock
, flags
);
1602 hwif
= hwgroup
->hwif
;
1604 if (!ide_ack_intr(hwif
)) {
1605 spin_unlock_irqrestore(&ide_lock
, flags
);
1609 if ((handler
= hwgroup
->handler
) == NULL
|| hwgroup
->polling
) {
1611 * Not expecting an interrupt from this drive.
1612 * That means this could be:
1613 * (1) an interrupt from another PCI device
1614 * sharing the same PCI INT# as us.
1615 * or (2) a drive just entered sleep or standby mode,
1616 * and is interrupting to let us know.
1617 * or (3) a spurious interrupt of unknown origin.
1619 * For PCI, we cannot tell the difference,
1620 * so in that case we just ignore it and hope it goes away.
1622 * FIXME: unexpected_intr should be hwif-> then we can
1623 * remove all the ifdef PCI crap
1625 #ifdef CONFIG_BLK_DEV_IDEPCI
1626 if (hwif
->pci_dev
&& !hwif
->pci_dev
->vendor
)
1627 #endif /* CONFIG_BLK_DEV_IDEPCI */
1630 * Probably not a shared PCI interrupt,
1631 * so we can safely try to do something about it:
1633 unexpected_intr(irq
, hwgroup
);
1634 #ifdef CONFIG_BLK_DEV_IDEPCI
1637 * Whack the status register, just in case
1638 * we have a leftover pending IRQ.
1640 (void) hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1641 #endif /* CONFIG_BLK_DEV_IDEPCI */
1643 spin_unlock_irqrestore(&ide_lock
, flags
);
1646 drive
= hwgroup
->drive
;
1649 * This should NEVER happen, and there isn't much
1650 * we could do about it here.
1652 * [Note - this can occur if the drive is hot unplugged]
1654 spin_unlock_irqrestore(&ide_lock
, flags
);
1657 if (!drive_is_ready(drive
)) {
1659 * This happens regularly when we share a PCI IRQ with
1660 * another device. Unfortunately, it can also happen
1661 * with some buggy drives that trigger the IRQ before
1662 * their status register is up to date. Hopefully we have
1663 * enough advance overhead that the latter isn't a problem.
1665 spin_unlock_irqrestore(&ide_lock
, flags
);
1668 if (!hwgroup
->busy
) {
1669 hwgroup
->busy
= 1; /* paranoia */
1670 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1672 hwgroup
->handler
= NULL
;
1674 del_timer(&hwgroup
->timer
);
1675 spin_unlock(&ide_lock
);
1677 /* Some controllers might set DMA INTR no matter DMA or PIO;
1678 * bmdma status might need to be cleared even for
1679 * PIO interrupts to prevent spurious/lost irq.
1681 if (hwif
->ide_dma_clear_irq
&& !(drive
->waiting_for_dma
))
1682 /* ide_dma_end() needs bmdma status for error checking.
1683 * So, skip clearing bmdma status here and leave it
1684 * to ide_dma_end() if this is dma interrupt.
1686 hwif
->ide_dma_clear_irq(drive
);
1689 local_irq_enable_in_hardirq();
1690 /* service this interrupt, may set handler for next interrupt */
1691 startstop
= handler(drive
);
1692 spin_lock_irq(&ide_lock
);
1695 * Note that handler() may have set things up for another
1696 * interrupt to occur soon, but it cannot happen until
1697 * we exit from this routine, because it will be the
1698 * same irq as is currently being serviced here, and Linux
1699 * won't allow another of the same (on any CPU) until we return.
1701 drive
->service_time
= jiffies
- drive
->service_start
;
1702 if (startstop
== ide_stopped
) {
1703 if (hwgroup
->handler
== NULL
) { /* paranoia */
1705 ide_do_request(hwgroup
, hwif
->irq
);
1707 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1708 "on exit\n", drive
->name
);
1711 spin_unlock_irqrestore(&ide_lock
, flags
);
1716 * ide_init_drive_cmd - initialize a drive command request
1717 * @rq: request object
1719 * Initialize a request before we fill it in and send it down to
1720 * ide_do_drive_cmd. Commands must be set up by this function. Right
1721 * now it doesn't do a lot, but if that changes abusers will have a
1725 void ide_init_drive_cmd (struct request
*rq
)
1727 memset(rq
, 0, sizeof(*rq
));
1728 rq
->cmd_type
= REQ_TYPE_ATA_CMD
;
1732 EXPORT_SYMBOL(ide_init_drive_cmd
);
1735 * ide_do_drive_cmd - issue IDE special command
1736 * @drive: device to issue command
1737 * @rq: request to issue
1738 * @action: action for processing
1740 * This function issues a special IDE device request
1741 * onto the request queue.
1743 * If action is ide_wait, then the rq is queued at the end of the
1744 * request queue, and the function sleeps until it has been processed.
1745 * This is for use when invoked from an ioctl handler.
1747 * If action is ide_preempt, then the rq is queued at the head of
1748 * the request queue, displacing the currently-being-processed
1749 * request and this function returns immediately without waiting
1750 * for the new rq to be completed. This is VERY DANGEROUS, and is
1751 * intended for careful use by the ATAPI tape/cdrom driver code.
1753 * If action is ide_end, then the rq is queued at the end of the
1754 * request queue, and the function returns immediately without waiting
1755 * for the new rq to be completed. This is again intended for careful
1756 * use by the ATAPI tape/cdrom driver code.
1759 int ide_do_drive_cmd (ide_drive_t
*drive
, struct request
*rq
, ide_action_t action
)
1761 unsigned long flags
;
1762 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1763 DECLARE_COMPLETION_ONSTACK(wait
);
1764 int where
= ELEVATOR_INSERT_BACK
, err
;
1765 int must_wait
= (action
== ide_wait
|| action
== ide_head_wait
);
1770 * we need to hold an extra reference to request for safe inspection
1775 rq
->end_io_data
= &wait
;
1776 rq
->end_io
= blk_end_sync_rq
;
1779 spin_lock_irqsave(&ide_lock
, flags
);
1780 if (action
== ide_preempt
)
1782 if (action
== ide_preempt
|| action
== ide_head_wait
) {
1783 where
= ELEVATOR_INSERT_FRONT
;
1784 rq
->cmd_flags
|= REQ_PREEMPT
;
1786 __elv_add_request(drive
->queue
, rq
, where
, 0);
1787 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1788 spin_unlock_irqrestore(&ide_lock
, flags
);
1792 wait_for_completion(&wait
);
1796 blk_put_request(rq
);
1802 EXPORT_SYMBOL(ide_do_drive_cmd
);