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 ide_set_max_pio(drive
);
206 * skip idedisk_pm_idle for ATAPI devices
208 if (drive
->media
!= ide_disk
)
209 pm
->pm_step
= ide_pm_restore_dma
;
211 ide_complete_power_step(drive
, rq
, 0, 0);
214 case idedisk_pm_idle
: /* Resume step 2 (idle) */
215 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_IDLEIMMEDIATE
;
216 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
217 args
->handler
= task_no_data_intr
;
218 return do_rw_taskfile(drive
, args
);
220 case ide_pm_restore_dma
: /* Resume step 3 (restore DMA) */
222 * Right now, all we do is call ide_set_dma(drive),
223 * we could be smarter and check for current xfer_speed
224 * in struct drive etc...
226 if (drive
->hwif
->ide_dma_on
== NULL
)
228 drive
->hwif
->dma_off_quietly(drive
);
230 * TODO: respect ->using_dma setting
235 pm
->pm_step
= ide_pm_state_completed
;
240 * ide_end_dequeued_request - complete an IDE I/O
241 * @drive: IDE device for the I/O
243 * @nr_sectors: number of sectors completed
245 * Complete an I/O that is no longer on the request queue. This
246 * typically occurs when we pull the request and issue a REQUEST_SENSE.
247 * We must still finish the old request but we must not tamper with the
248 * queue in the meantime.
250 * NOTE: This path does not handle barrier, but barrier is not supported
254 int ide_end_dequeued_request(ide_drive_t
*drive
, struct request
*rq
,
255 int uptodate
, int nr_sectors
)
260 spin_lock_irqsave(&ide_lock
, flags
);
262 BUG_ON(!blk_rq_started(rq
));
265 * if failfast is set on a request, override number of sectors and
266 * complete the whole request right now
268 if (blk_noretry_request(rq
) && end_io_error(uptodate
))
269 nr_sectors
= rq
->hard_nr_sectors
;
271 if (!blk_fs_request(rq
) && end_io_error(uptodate
) && !rq
->errors
)
275 * decide whether to reenable DMA -- 3 is a random magic for now,
276 * if we DMA timeout more than 3 times, just stay in PIO
278 if (drive
->state
== DMA_PIO_RETRY
&& drive
->retry_pio
<= 3) {
280 HWGROUP(drive
)->hwif
->ide_dma_on(drive
);
283 if (!end_that_request_first(rq
, uptodate
, nr_sectors
)) {
284 add_disk_randomness(rq
->rq_disk
);
285 if (blk_rq_tagged(rq
))
286 blk_queue_end_tag(drive
->queue
, rq
);
287 end_that_request_last(rq
, uptodate
);
290 spin_unlock_irqrestore(&ide_lock
, flags
);
293 EXPORT_SYMBOL_GPL(ide_end_dequeued_request
);
297 * ide_complete_pm_request - end the current Power Management request
298 * @drive: target drive
301 * This function cleans up the current PM request and stops the queue
304 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
309 printk("%s: completing PM request, %s\n", drive
->name
,
310 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
312 spin_lock_irqsave(&ide_lock
, flags
);
313 if (blk_pm_suspend_request(rq
)) {
314 blk_stop_queue(drive
->queue
);
317 blk_start_queue(drive
->queue
);
319 blkdev_dequeue_request(rq
);
320 HWGROUP(drive
)->rq
= NULL
;
321 end_that_request_last(rq
, 1);
322 spin_unlock_irqrestore(&ide_lock
, flags
);
326 * ide_end_drive_cmd - end an explicit drive command
331 * Clean up after success/failure of an explicit drive command.
332 * These get thrown onto the queue so they are synchronized with
333 * real I/O operations on the drive.
335 * In LBA48 mode we have to read the register set twice to get
336 * all the extra information out.
339 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
341 ide_hwif_t
*hwif
= HWIF(drive
);
345 spin_lock_irqsave(&ide_lock
, flags
);
346 rq
= HWGROUP(drive
)->rq
;
347 spin_unlock_irqrestore(&ide_lock
, flags
);
349 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
350 u8
*args
= (u8
*) rq
->buffer
;
352 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
357 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
359 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
360 u8
*args
= (u8
*) rq
->buffer
;
362 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
367 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
368 args
[3] = hwif
->INB(IDE_SECTOR_REG
);
369 args
[4] = hwif
->INB(IDE_LCYL_REG
);
370 args
[5] = hwif
->INB(IDE_HCYL_REG
);
371 args
[6] = hwif
->INB(IDE_SELECT_REG
);
373 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
374 ide_task_t
*args
= (ide_task_t
*) rq
->special
;
376 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
379 if (args
->tf_in_flags
.b
.data
) {
380 u16 data
= hwif
->INW(IDE_DATA_REG
);
381 args
->tfRegister
[IDE_DATA_OFFSET
] = (data
) & 0xFF;
382 args
->hobRegister
[IDE_DATA_OFFSET
] = (data
>> 8) & 0xFF;
384 args
->tfRegister
[IDE_ERROR_OFFSET
] = err
;
385 /* be sure we're looking at the low order bits */
386 hwif
->OUTB(drive
->ctl
& ~0x80, IDE_CONTROL_REG
);
387 args
->tfRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
388 args
->tfRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
389 args
->tfRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
390 args
->tfRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
391 args
->tfRegister
[IDE_SELECT_OFFSET
] = hwif
->INB(IDE_SELECT_REG
);
392 args
->tfRegister
[IDE_STATUS_OFFSET
] = stat
;
394 if (drive
->addressing
== 1) {
395 hwif
->OUTB(drive
->ctl
|0x80, IDE_CONTROL_REG
);
396 args
->hobRegister
[IDE_FEATURE_OFFSET
] = hwif
->INB(IDE_FEATURE_REG
);
397 args
->hobRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
398 args
->hobRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
399 args
->hobRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
400 args
->hobRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
403 } else if (blk_pm_request(rq
)) {
404 struct request_pm_state
*pm
= rq
->data
;
406 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
407 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
409 ide_complete_power_step(drive
, rq
, stat
, err
);
410 if (pm
->pm_step
== ide_pm_state_completed
)
411 ide_complete_pm_request(drive
, rq
);
415 spin_lock_irqsave(&ide_lock
, flags
);
416 blkdev_dequeue_request(rq
);
417 HWGROUP(drive
)->rq
= NULL
;
419 end_that_request_last(rq
, !rq
->errors
);
420 spin_unlock_irqrestore(&ide_lock
, flags
);
423 EXPORT_SYMBOL(ide_end_drive_cmd
);
426 * try_to_flush_leftover_data - flush junk
427 * @drive: drive to flush
429 * try_to_flush_leftover_data() is invoked in response to a drive
430 * unexpectedly having its DRQ_STAT bit set. As an alternative to
431 * resetting the drive, this routine tries to clear the condition
432 * by read a sector's worth of data from the drive. Of course,
433 * this may not help if the drive is *waiting* for data from *us*.
435 static void try_to_flush_leftover_data (ide_drive_t
*drive
)
437 int i
= (drive
->mult_count
? drive
->mult_count
: 1) * SECTOR_WORDS
;
439 if (drive
->media
!= ide_disk
)
443 u32 wcount
= (i
> 16) ? 16 : i
;
446 HWIF(drive
)->ata_input_data(drive
, buffer
, wcount
);
450 static void ide_kill_rq(ide_drive_t
*drive
, struct request
*rq
)
455 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
456 drv
->end_request(drive
, 0, 0);
458 ide_end_request(drive
, 0, 0);
461 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
463 ide_hwif_t
*hwif
= drive
->hwif
;
465 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
466 /* other bits are useless when BUSY */
467 rq
->errors
|= ERROR_RESET
;
468 } else if (stat
& ERR_STAT
) {
469 /* err has different meaning on cdrom and tape */
470 if (err
== ABRT_ERR
) {
471 if (drive
->select
.b
.lba
&&
472 /* some newer drives don't support WIN_SPECIFY */
473 hwif
->INB(IDE_COMMAND_REG
) == WIN_SPECIFY
)
475 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
476 /* UDMA crc error, just retry the operation */
478 } else if (err
& (BBD_ERR
| ECC_ERR
)) {
479 /* retries won't help these */
480 rq
->errors
= ERROR_MAX
;
481 } else if (err
& TRK0_ERR
) {
482 /* help it find track zero */
483 rq
->errors
|= ERROR_RECAL
;
487 if ((stat
& DRQ_STAT
) && rq_data_dir(rq
) == READ
&&
488 (hwif
->host_flags
& IDE_HFLAG_ERROR_STOPS_FIFO
) == 0)
489 try_to_flush_leftover_data(drive
);
491 if (rq
->errors
>= ERROR_MAX
|| blk_noretry_request(rq
)) {
492 ide_kill_rq(drive
, rq
);
496 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
497 rq
->errors
|= ERROR_RESET
;
499 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
501 return ide_do_reset(drive
);
504 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
505 drive
->special
.b
.recalibrate
= 1;
512 static ide_startstop_t
ide_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
514 ide_hwif_t
*hwif
= drive
->hwif
;
516 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
517 /* other bits are useless when BUSY */
518 rq
->errors
|= ERROR_RESET
;
520 /* add decoding error stuff */
523 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
525 hwif
->OUTB(WIN_IDLEIMMEDIATE
, IDE_COMMAND_REG
);
527 if (rq
->errors
>= ERROR_MAX
) {
528 ide_kill_rq(drive
, rq
);
530 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
532 return ide_do_reset(drive
);
541 __ide_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
543 if (drive
->media
== ide_disk
)
544 return ide_ata_error(drive
, rq
, stat
, err
);
545 return ide_atapi_error(drive
, rq
, stat
, err
);
548 EXPORT_SYMBOL_GPL(__ide_error
);
551 * ide_error - handle an error on the IDE
552 * @drive: drive the error occurred on
553 * @msg: message to report
556 * ide_error() takes action based on the error returned by the drive.
557 * For normal I/O that may well include retries. We deal with
558 * both new-style (taskfile) and old style command handling here.
559 * In the case of taskfile command handling there is work left to
563 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
568 err
= ide_dump_status(drive
, msg
, stat
);
570 if ((rq
= HWGROUP(drive
)->rq
) == NULL
)
573 /* retry only "normal" I/O: */
574 if (!blk_fs_request(rq
)) {
576 ide_end_drive_cmd(drive
, stat
, err
);
583 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
584 return drv
->error(drive
, rq
, stat
, err
);
586 return __ide_error(drive
, rq
, stat
, err
);
589 EXPORT_SYMBOL_GPL(ide_error
);
591 ide_startstop_t
__ide_abort(ide_drive_t
*drive
, struct request
*rq
)
593 if (drive
->media
!= ide_disk
)
594 rq
->errors
|= ERROR_RESET
;
596 ide_kill_rq(drive
, rq
);
601 EXPORT_SYMBOL_GPL(__ide_abort
);
604 * ide_abort - abort pending IDE operations
605 * @drive: drive the error occurred on
606 * @msg: message to report
608 * ide_abort kills and cleans up when we are about to do a
609 * host initiated reset on active commands. Longer term we
610 * want handlers to have sensible abort handling themselves
612 * This differs fundamentally from ide_error because in
613 * this case the command is doing just fine when we
617 ide_startstop_t
ide_abort(ide_drive_t
*drive
, const char *msg
)
621 if (drive
== NULL
|| (rq
= HWGROUP(drive
)->rq
) == NULL
)
624 /* retry only "normal" I/O: */
625 if (!blk_fs_request(rq
)) {
627 ide_end_drive_cmd(drive
, BUSY_STAT
, 0);
634 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
635 return drv
->abort(drive
, rq
);
637 return __ide_abort(drive
, rq
);
641 * ide_cmd - issue a simple drive command
642 * @drive: drive the command is for
644 * @nsect: sector byte
645 * @handler: handler for the command completion
647 * Issue a simple drive command with interrupts.
648 * The drive must be selected beforehand.
651 static void ide_cmd (ide_drive_t
*drive
, u8 cmd
, u8 nsect
,
652 ide_handler_t
*handler
)
654 ide_hwif_t
*hwif
= HWIF(drive
);
656 hwif
->OUTB(drive
->ctl
,IDE_CONTROL_REG
); /* clear nIEN */
657 SELECT_MASK(drive
,0);
658 hwif
->OUTB(nsect
,IDE_NSECTOR_REG
);
659 ide_execute_command(drive
, cmd
, handler
, WAIT_CMD
, NULL
);
663 * drive_cmd_intr - drive command completion interrupt
664 * @drive: drive the completion interrupt occurred on
666 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
667 * We do any necessary data reading and then wait for the drive to
668 * go non busy. At that point we may read the error data and complete
672 static ide_startstop_t
drive_cmd_intr (ide_drive_t
*drive
)
674 struct request
*rq
= HWGROUP(drive
)->rq
;
675 ide_hwif_t
*hwif
= HWIF(drive
);
676 u8
*args
= (u8
*) rq
->buffer
;
677 u8 stat
= hwif
->INB(IDE_STATUS_REG
);
680 local_irq_enable_in_hardirq();
681 if ((stat
& DRQ_STAT
) && args
&& args
[3]) {
682 u8 io_32bit
= drive
->io_32bit
;
684 hwif
->ata_input_data(drive
, &args
[4], args
[3] * SECTOR_WORDS
);
685 drive
->io_32bit
= io_32bit
;
686 while (((stat
= hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) && retries
--)
690 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
))
691 return ide_error(drive
, "drive_cmd", stat
);
692 /* calls ide_end_drive_cmd */
693 ide_end_drive_cmd(drive
, stat
, hwif
->INB(IDE_ERROR_REG
));
697 static void ide_init_specify_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
699 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->sect
;
700 task
->tfRegister
[IDE_SECTOR_OFFSET
] = drive
->sect
;
701 task
->tfRegister
[IDE_LCYL_OFFSET
] = drive
->cyl
;
702 task
->tfRegister
[IDE_HCYL_OFFSET
] = drive
->cyl
>>8;
703 task
->tfRegister
[IDE_SELECT_OFFSET
] = ((drive
->head
-1)|drive
->select
.all
)&0xBF;
704 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_SPECIFY
;
706 task
->handler
= &set_geometry_intr
;
709 static void ide_init_restore_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
711 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->sect
;
712 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_RESTORE
;
714 task
->handler
= &recal_intr
;
717 static void ide_init_setmult_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
719 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->mult_req
;
720 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_SETMULT
;
722 task
->handler
= &set_multmode_intr
;
725 static ide_startstop_t
ide_disk_special(ide_drive_t
*drive
)
727 special_t
*s
= &drive
->special
;
730 memset(&args
, 0, sizeof(ide_task_t
));
731 args
.command_type
= IDE_DRIVE_TASK_NO_DATA
;
733 if (s
->b
.set_geometry
) {
734 s
->b
.set_geometry
= 0;
735 ide_init_specify_cmd(drive
, &args
);
736 } else if (s
->b
.recalibrate
) {
737 s
->b
.recalibrate
= 0;
738 ide_init_restore_cmd(drive
, &args
);
739 } else if (s
->b
.set_multmode
) {
740 s
->b
.set_multmode
= 0;
741 if (drive
->mult_req
> drive
->id
->max_multsect
)
742 drive
->mult_req
= drive
->id
->max_multsect
;
743 ide_init_setmult_cmd(drive
, &args
);
745 int special
= s
->all
;
747 printk(KERN_ERR
"%s: bad special flag: 0x%02x\n", drive
->name
, special
);
751 do_rw_taskfile(drive
, &args
);
757 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
759 static int set_pio_mode_abuse(ide_hwif_t
*hwif
, u8 req_pio
)
768 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_DMA_MODES
) ? 1 : 0;
771 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_PREFETCH
) ? 1 : 0;
774 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_FAST_DEVSEL
) ? 1 : 0;
781 * do_special - issue some special commands
782 * @drive: drive the command is for
784 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
785 * commands to a drive. It used to do much more, but has been scaled
789 static ide_startstop_t
do_special (ide_drive_t
*drive
)
791 special_t
*s
= &drive
->special
;
794 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
797 ide_hwif_t
*hwif
= drive
->hwif
;
798 u8 req_pio
= drive
->tune_req
;
802 if (set_pio_mode_abuse(drive
->hwif
, req_pio
)) {
803 if (hwif
->set_pio_mode
)
804 hwif
->set_pio_mode(drive
, req_pio
);
806 int keep_dma
= drive
->using_dma
;
808 ide_set_pio(drive
, req_pio
);
810 if (hwif
->host_flags
& IDE_HFLAG_SET_PIO_MODE_KEEP_DMA
) {
812 hwif
->ide_dma_on(drive
);
818 if (drive
->media
== ide_disk
)
819 return ide_disk_special(drive
);
827 void ide_map_sg(ide_drive_t
*drive
, struct request
*rq
)
829 ide_hwif_t
*hwif
= drive
->hwif
;
830 struct scatterlist
*sg
= hwif
->sg_table
;
832 if (hwif
->sg_mapped
) /* needed by ide-scsi */
835 if (rq
->cmd_type
!= REQ_TYPE_ATA_TASKFILE
) {
836 hwif
->sg_nents
= blk_rq_map_sg(drive
->queue
, rq
, sg
);
838 sg_init_one(sg
, rq
->buffer
, rq
->nr_sectors
* SECTOR_SIZE
);
843 EXPORT_SYMBOL_GPL(ide_map_sg
);
845 void ide_init_sg_cmd(ide_drive_t
*drive
, struct request
*rq
)
847 ide_hwif_t
*hwif
= drive
->hwif
;
849 hwif
->nsect
= hwif
->nleft
= rq
->nr_sectors
;
854 EXPORT_SYMBOL_GPL(ide_init_sg_cmd
);
857 * execute_drive_command - issue special drive command
858 * @drive: the drive to issue the command on
859 * @rq: the request structure holding the command
861 * execute_drive_cmd() issues a special drive command, usually
862 * initiated by ioctl() from the external hdparm program. The
863 * command can be a drive command, drive task or taskfile
864 * operation. Weirdly you can call it with NULL to wait for
865 * all commands to finish. Don't do this as that is due to change
868 static ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
,
871 ide_hwif_t
*hwif
= HWIF(drive
);
872 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
873 ide_task_t
*args
= rq
->special
;
878 hwif
->data_phase
= args
->data_phase
;
880 switch (hwif
->data_phase
) {
881 case TASKFILE_MULTI_OUT
:
883 case TASKFILE_MULTI_IN
:
885 ide_init_sg_cmd(drive
, rq
);
886 ide_map_sg(drive
, rq
);
891 if (args
->tf_out_flags
.all
!= 0)
892 return flagged_taskfile(drive
, args
);
893 return do_rw_taskfile(drive
, args
);
894 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
895 u8
*args
= rq
->buffer
;
901 printk("%s: DRIVE_TASK_CMD ", drive
->name
);
902 printk("cmd=0x%02x ", args
[0]);
903 printk("fr=0x%02x ", args
[1]);
904 printk("ns=0x%02x ", args
[2]);
905 printk("sc=0x%02x ", args
[3]);
906 printk("lcyl=0x%02x ", args
[4]);
907 printk("hcyl=0x%02x ", args
[5]);
908 printk("sel=0x%02x\n", args
[6]);
910 hwif
->OUTB(args
[1], IDE_FEATURE_REG
);
911 hwif
->OUTB(args
[3], IDE_SECTOR_REG
);
912 hwif
->OUTB(args
[4], IDE_LCYL_REG
);
913 hwif
->OUTB(args
[5], IDE_HCYL_REG
);
914 sel
= (args
[6] & ~0x10);
915 if (drive
->select
.b
.unit
)
917 hwif
->OUTB(sel
, IDE_SELECT_REG
);
918 ide_cmd(drive
, args
[0], args
[2], &drive_cmd_intr
);
920 } else if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
921 u8
*args
= rq
->buffer
;
926 printk("%s: DRIVE_CMD ", drive
->name
);
927 printk("cmd=0x%02x ", args
[0]);
928 printk("sc=0x%02x ", args
[1]);
929 printk("fr=0x%02x ", args
[2]);
930 printk("xx=0x%02x\n", args
[3]);
932 if (args
[0] == WIN_SMART
) {
933 hwif
->OUTB(0x4f, IDE_LCYL_REG
);
934 hwif
->OUTB(0xc2, IDE_HCYL_REG
);
935 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
936 hwif
->OUTB(args
[1],IDE_SECTOR_REG
);
937 ide_cmd(drive
, args
[0], args
[3], &drive_cmd_intr
);
940 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
941 ide_cmd(drive
, args
[0], args
[1], &drive_cmd_intr
);
947 * NULL is actually a valid way of waiting for
948 * all current requests to be flushed from the queue.
951 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
953 ide_end_drive_cmd(drive
,
954 hwif
->INB(IDE_STATUS_REG
),
955 hwif
->INB(IDE_ERROR_REG
));
959 static void ide_check_pm_state(ide_drive_t
*drive
, struct request
*rq
)
961 struct request_pm_state
*pm
= rq
->data
;
963 if (blk_pm_suspend_request(rq
) &&
964 pm
->pm_step
== ide_pm_state_start_suspend
)
965 /* Mark drive blocked when starting the suspend sequence. */
967 else if (blk_pm_resume_request(rq
) &&
968 pm
->pm_step
== ide_pm_state_start_resume
) {
970 * The first thing we do on wakeup is to wait for BSY bit to
971 * go away (with a looong timeout) as a drive on this hwif may
972 * just be POSTing itself.
973 * We do that before even selecting as the "other" device on
974 * the bus may be broken enough to walk on our toes at this
979 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
981 rc
= ide_wait_not_busy(HWIF(drive
), 35000);
983 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
985 HWIF(drive
)->OUTB(8, HWIF(drive
)->io_ports
[IDE_CONTROL_OFFSET
]);
986 rc
= ide_wait_not_busy(HWIF(drive
), 100000);
988 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
993 * start_request - start of I/O and command issuing for IDE
995 * start_request() initiates handling of a new I/O request. It
996 * accepts commands and I/O (read/write) requests. It also does
997 * the final remapping for weird stuff like EZDrive. Once
998 * device mapper can work sector level the EZDrive stuff can go away
1000 * FIXME: this function needs a rename
1003 static ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
1005 ide_startstop_t startstop
;
1008 BUG_ON(!blk_rq_started(rq
));
1011 printk("%s: start_request: current=0x%08lx\n",
1012 HWIF(drive
)->name
, (unsigned long) rq
);
1015 /* bail early if we've exceeded max_failures */
1016 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
1021 if (blk_fs_request(rq
) &&
1022 (drive
->media
== ide_disk
|| drive
->media
== ide_floppy
)) {
1023 block
+= drive
->sect0
;
1025 /* Yecch - this will shift the entire interval,
1026 possibly killing some innocent following sector */
1027 if (block
== 0 && drive
->remap_0_to_1
== 1)
1028 block
= 1; /* redirect MBR access to EZ-Drive partn table */
1030 if (blk_pm_request(rq
))
1031 ide_check_pm_state(drive
, rq
);
1033 SELECT_DRIVE(drive
);
1034 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
, BUSY_STAT
|DRQ_STAT
, WAIT_READY
)) {
1035 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
1038 if (!drive
->special
.all
) {
1042 * We reset the drive so we need to issue a SETFEATURES.
1043 * Do it _after_ do_special() restored device parameters.
1045 if (drive
->current_speed
== 0xff)
1046 ide_config_drive_speed(drive
, drive
->desired_speed
);
1048 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
||
1049 rq
->cmd_type
== REQ_TYPE_ATA_TASK
||
1050 rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
)
1051 return execute_drive_cmd(drive
, rq
);
1052 else if (blk_pm_request(rq
)) {
1053 struct request_pm_state
*pm
= rq
->data
;
1055 printk("%s: start_power_step(step: %d)\n",
1056 drive
->name
, rq
->pm
->pm_step
);
1058 startstop
= ide_start_power_step(drive
, rq
);
1059 if (startstop
== ide_stopped
&&
1060 pm
->pm_step
== ide_pm_state_completed
)
1061 ide_complete_pm_request(drive
, rq
);
1065 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
1066 return drv
->do_request(drive
, rq
, block
);
1068 return do_special(drive
);
1070 ide_kill_rq(drive
, rq
);
1075 * ide_stall_queue - pause an IDE device
1076 * @drive: drive to stall
1077 * @timeout: time to stall for (jiffies)
1079 * ide_stall_queue() can be used by a drive to give excess bandwidth back
1080 * to the hwgroup by sleeping for timeout jiffies.
1083 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
1085 if (timeout
> WAIT_WORSTCASE
)
1086 timeout
= WAIT_WORSTCASE
;
1087 drive
->sleep
= timeout
+ jiffies
;
1088 drive
->sleeping
= 1;
1091 EXPORT_SYMBOL(ide_stall_queue
);
1093 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
1096 * choose_drive - select a drive to service
1097 * @hwgroup: hardware group to select on
1099 * choose_drive() selects the next drive which will be serviced.
1100 * This is necessary because the IDE layer can't issue commands
1101 * to both drives on the same cable, unlike SCSI.
1104 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
1106 ide_drive_t
*drive
, *best
;
1110 drive
= hwgroup
->drive
;
1113 * drive is doing pre-flush, ordered write, post-flush sequence. even
1114 * though that is 3 requests, it must be seen as a single transaction.
1115 * we must not preempt this drive until that is complete
1117 if (blk_queue_flushing(drive
->queue
)) {
1119 * small race where queue could get replugged during
1120 * the 3-request flush cycle, just yank the plug since
1121 * we want it to finish asap
1123 blk_remove_plug(drive
->queue
);
1128 if ((!drive
->sleeping
|| time_after_eq(jiffies
, drive
->sleep
))
1129 && !elv_queue_empty(drive
->queue
)) {
1131 || (drive
->sleeping
&& (!best
->sleeping
|| time_before(drive
->sleep
, best
->sleep
)))
1132 || (!best
->sleeping
&& time_before(WAKEUP(drive
), WAKEUP(best
))))
1134 if (!blk_queue_plugged(drive
->queue
))
1138 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1139 if (best
&& best
->nice1
&& !best
->sleeping
&& best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
1140 long t
= (signed long)(WAKEUP(best
) - jiffies
);
1141 if (t
>= WAIT_MIN_SLEEP
) {
1143 * We *may* have some time to spare, but first let's see if
1144 * someone can potentially benefit from our nice mood today..
1148 if (!drive
->sleeping
1149 && time_before(jiffies
- best
->service_time
, WAKEUP(drive
))
1150 && time_before(WAKEUP(drive
), jiffies
+ t
))
1152 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
1155 } while ((drive
= drive
->next
) != best
);
1162 * Issue a new request to a drive from hwgroup
1163 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
1165 * A hwgroup is a serialized group of IDE interfaces. Usually there is
1166 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
1167 * may have both interfaces in a single hwgroup to "serialize" access.
1168 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
1169 * together into one hwgroup for serialized access.
1171 * Note also that several hwgroups can end up sharing a single IRQ,
1172 * possibly along with many other devices. This is especially common in
1173 * PCI-based systems with off-board IDE controller cards.
1175 * The IDE driver uses the single global ide_lock spinlock to protect
1176 * access to the request queues, and to protect the hwgroup->busy flag.
1178 * The first thread into the driver for a particular hwgroup sets the
1179 * hwgroup->busy flag to indicate that this hwgroup is now active,
1180 * and then initiates processing of the top request from the request queue.
1182 * Other threads attempting entry notice the busy setting, and will simply
1183 * queue their new requests and exit immediately. Note that hwgroup->busy
1184 * remains set even when the driver is merely awaiting the next interrupt.
1185 * Thus, the meaning is "this hwgroup is busy processing a request".
1187 * When processing of a request completes, the completing thread or IRQ-handler
1188 * will start the next request from the queue. If no more work remains,
1189 * the driver will clear the hwgroup->busy flag and exit.
1191 * The ide_lock (spinlock) is used to protect all access to the
1192 * hwgroup->busy flag, but is otherwise not needed for most processing in
1193 * the driver. This makes the driver much more friendlier to shared IRQs
1194 * than previous designs, while remaining 100% (?) SMP safe and capable.
1196 static void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
1201 ide_startstop_t startstop
;
1204 /* for atari only: POSSIBLY BROKEN HERE(?) */
1205 ide_get_lock(ide_intr
, hwgroup
);
1207 /* caller must own ide_lock */
1208 BUG_ON(!irqs_disabled());
1210 while (!hwgroup
->busy
) {
1212 drive
= choose_drive(hwgroup
);
1213 if (drive
== NULL
) {
1215 unsigned long sleep
= 0; /* shut up, gcc */
1217 drive
= hwgroup
->drive
;
1219 if (drive
->sleeping
&& (!sleeping
|| time_before(drive
->sleep
, sleep
))) {
1221 sleep
= drive
->sleep
;
1223 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1226 * Take a short snooze, and then wake up this hwgroup again.
1227 * This gives other hwgroups on the same a chance to
1228 * play fairly with us, just in case there are big differences
1229 * in relative throughputs.. don't want to hog the cpu too much.
1231 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
1232 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
1234 if (timer_pending(&hwgroup
->timer
))
1235 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
1237 /* so that ide_timer_expiry knows what to do */
1238 hwgroup
->sleeping
= 1;
1239 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1240 mod_timer(&hwgroup
->timer
, sleep
);
1241 /* we purposely leave hwgroup->busy==1
1244 /* Ugly, but how can we sleep for the lock
1245 * otherwise? perhaps from tq_disk?
1248 /* for atari only */
1253 /* no more work for this hwgroup (for now) */
1258 if (hwgroup
->hwif
->sharing_irq
&&
1259 hwif
!= hwgroup
->hwif
&&
1260 hwif
->io_ports
[IDE_CONTROL_OFFSET
]) {
1261 /* set nIEN for previous hwif */
1262 SELECT_INTERRUPT(drive
);
1264 hwgroup
->hwif
= hwif
;
1265 hwgroup
->drive
= drive
;
1266 drive
->sleeping
= 0;
1267 drive
->service_start
= jiffies
;
1269 if (blk_queue_plugged(drive
->queue
)) {
1270 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1275 * we know that the queue isn't empty, but this can happen
1276 * if the q->prep_rq_fn() decides to kill a request
1278 rq
= elv_next_request(drive
->queue
);
1285 * Sanity: don't accept a request that isn't a PM request
1286 * if we are currently power managed. This is very important as
1287 * blk_stop_queue() doesn't prevent the elv_next_request()
1288 * above to return us whatever is in the queue. Since we call
1289 * ide_do_request() ourselves, we end up taking requests while
1290 * the queue is blocked...
1292 * We let requests forced at head of queue with ide-preempt
1293 * though. I hope that doesn't happen too much, hopefully not
1294 * unless the subdriver triggers such a thing in its own PM
1297 * We count how many times we loop here to make sure we service
1298 * all drives in the hwgroup without looping for ever
1300 if (drive
->blocked
&& !blk_pm_request(rq
) && !(rq
->cmd_flags
& REQ_PREEMPT
)) {
1301 drive
= drive
->next
? drive
->next
: hwgroup
->drive
;
1302 if (loops
++ < 4 && !blk_queue_plugged(drive
->queue
))
1304 /* We clear busy, there should be no pending ATA command at this point. */
1312 * Some systems have trouble with IDE IRQs arriving while
1313 * the driver is still setting things up. So, here we disable
1314 * the IRQ used by this interface while the request is being started.
1315 * This may look bad at first, but pretty much the same thing
1316 * happens anyway when any interrupt comes in, IDE or otherwise
1317 * -- the kernel masks the IRQ while it is being handled.
1319 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1320 disable_irq_nosync(hwif
->irq
);
1321 spin_unlock(&ide_lock
);
1322 local_irq_enable_in_hardirq();
1323 /* allow other IRQs while we start this request */
1324 startstop
= start_request(drive
, rq
);
1325 spin_lock_irq(&ide_lock
);
1326 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1327 enable_irq(hwif
->irq
);
1328 if (startstop
== ide_stopped
)
1334 * Passes the stuff to ide_do_request
1336 void do_ide_request(struct request_queue
*q
)
1338 ide_drive_t
*drive
= q
->queuedata
;
1340 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1344 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1345 * retry the current request in pio mode instead of risking tossing it
1348 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1350 ide_hwif_t
*hwif
= HWIF(drive
);
1352 ide_startstop_t ret
= ide_stopped
;
1355 * end current dma transaction
1359 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1360 (void)HWIF(drive
)->ide_dma_end(drive
);
1361 ret
= ide_error(drive
, "dma timeout error",
1362 hwif
->INB(IDE_STATUS_REG
));
1364 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1365 hwif
->dma_timeout(drive
);
1369 * disable dma for now, but remember that we did so because of
1370 * a timeout -- we'll reenable after we finish this next request
1371 * (or rather the first chunk of it) in pio.
1374 drive
->state
= DMA_PIO_RETRY
;
1375 hwif
->dma_off_quietly(drive
);
1378 * un-busy drive etc (hwgroup->busy is cleared on return) and
1379 * make sure request is sane
1381 rq
= HWGROUP(drive
)->rq
;
1386 HWGROUP(drive
)->rq
= NULL
;
1393 rq
->sector
= rq
->bio
->bi_sector
;
1394 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1395 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1396 rq
->buffer
= bio_data(rq
->bio
);
1402 * ide_timer_expiry - handle lack of an IDE interrupt
1403 * @data: timer callback magic (hwgroup)
1405 * An IDE command has timed out before the expected drive return
1406 * occurred. At this point we attempt to clean up the current
1407 * mess. If the current handler includes an expiry handler then
1408 * we invoke the expiry handler, and providing it is happy the
1409 * work is done. If that fails we apply generic recovery rules
1410 * invoking the handler and checking the drive DMA status. We
1411 * have an excessively incestuous relationship with the DMA
1412 * logic that wants cleaning up.
1415 void ide_timer_expiry (unsigned long data
)
1417 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1418 ide_handler_t
*handler
;
1419 ide_expiry_t
*expiry
;
1420 unsigned long flags
;
1421 unsigned long wait
= -1;
1423 spin_lock_irqsave(&ide_lock
, flags
);
1425 if (((handler
= hwgroup
->handler
) == NULL
) ||
1426 (hwgroup
->req_gen
!= hwgroup
->req_gen_timer
)) {
1428 * Either a marginal timeout occurred
1429 * (got the interrupt just as timer expired),
1430 * or we were "sleeping" to give other devices a chance.
1431 * Either way, we don't really want to complain about anything.
1433 if (hwgroup
->sleeping
) {
1434 hwgroup
->sleeping
= 0;
1438 ide_drive_t
*drive
= hwgroup
->drive
;
1440 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1441 hwgroup
->handler
= NULL
;
1444 ide_startstop_t startstop
= ide_stopped
;
1445 if (!hwgroup
->busy
) {
1446 hwgroup
->busy
= 1; /* paranoia */
1447 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1449 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1451 if ((wait
= expiry(drive
)) > 0) {
1453 hwgroup
->timer
.expires
= jiffies
+ wait
;
1454 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1455 add_timer(&hwgroup
->timer
);
1456 spin_unlock_irqrestore(&ide_lock
, flags
);
1460 hwgroup
->handler
= NULL
;
1462 * We need to simulate a real interrupt when invoking
1463 * the handler() function, which means we need to
1464 * globally mask the specific IRQ:
1466 spin_unlock(&ide_lock
);
1468 #if DISABLE_IRQ_NOSYNC
1469 disable_irq_nosync(hwif
->irq
);
1471 /* disable_irq_nosync ?? */
1472 disable_irq(hwif
->irq
);
1473 #endif /* DISABLE_IRQ_NOSYNC */
1475 * as if we were handling an interrupt */
1476 local_irq_disable();
1477 if (hwgroup
->polling
) {
1478 startstop
= handler(drive
);
1479 } else if (drive_is_ready(drive
)) {
1480 if (drive
->waiting_for_dma
)
1481 hwgroup
->hwif
->dma_lost_irq(drive
);
1482 (void)ide_ack_intr(hwif
);
1483 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1484 startstop
= handler(drive
);
1486 if (drive
->waiting_for_dma
) {
1487 startstop
= ide_dma_timeout_retry(drive
, wait
);
1490 ide_error(drive
, "irq timeout", hwif
->INB(IDE_STATUS_REG
));
1492 drive
->service_time
= jiffies
- drive
->service_start
;
1493 spin_lock_irq(&ide_lock
);
1494 enable_irq(hwif
->irq
);
1495 if (startstop
== ide_stopped
)
1499 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1500 spin_unlock_irqrestore(&ide_lock
, flags
);
1504 * unexpected_intr - handle an unexpected IDE interrupt
1505 * @irq: interrupt line
1506 * @hwgroup: hwgroup being processed
1508 * There's nothing really useful we can do with an unexpected interrupt,
1509 * other than reading the status register (to clear it), and logging it.
1510 * There should be no way that an irq can happen before we're ready for it,
1511 * so we needn't worry much about losing an "important" interrupt here.
1513 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1514 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1515 * looks "good", we just ignore the interrupt completely.
1517 * This routine assumes __cli() is in effect when called.
1519 * If an unexpected interrupt happens on irq15 while we are handling irq14
1520 * and if the two interfaces are "serialized" (CMD640), then it looks like
1521 * we could screw up by interfering with a new request being set up for
1524 * In reality, this is a non-issue. The new command is not sent unless
1525 * the drive is ready to accept one, in which case we know the drive is
1526 * not trying to interrupt us. And ide_set_handler() is always invoked
1527 * before completing the issuance of any new drive command, so we will not
1528 * be accidentally invoked as a result of any valid command completion
1531 * Note that we must walk the entire hwgroup here. We know which hwif
1532 * is doing the current command, but we don't know which hwif burped
1536 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1539 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1542 * handle the unexpected interrupt
1545 if (hwif
->irq
== irq
) {
1546 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1547 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
)) {
1548 /* Try to not flood the console with msgs */
1549 static unsigned long last_msgtime
, count
;
1551 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1552 last_msgtime
= jiffies
;
1553 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1554 "status=0x%02x, count=%ld\n",
1556 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1560 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1564 * ide_intr - default IDE interrupt handler
1565 * @irq: interrupt number
1566 * @dev_id: hwif group
1567 * @regs: unused weirdness from the kernel irq layer
1569 * This is the default IRQ handler for the IDE layer. You should
1570 * not need to override it. If you do be aware it is subtle in
1573 * hwgroup->hwif is the interface in the group currently performing
1574 * a command. hwgroup->drive is the drive and hwgroup->handler is
1575 * the IRQ handler to call. As we issue a command the handlers
1576 * step through multiple states, reassigning the handler to the
1577 * next step in the process. Unlike a smart SCSI controller IDE
1578 * expects the main processor to sequence the various transfer
1579 * stages. We also manage a poll timer to catch up with most
1580 * timeout situations. There are still a few where the handlers
1581 * don't ever decide to give up.
1583 * The handler eventually returns ide_stopped to indicate the
1584 * request completed. At this point we issue the next request
1585 * on the hwgroup and the process begins again.
1588 irqreturn_t
ide_intr (int irq
, void *dev_id
)
1590 unsigned long flags
;
1591 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1594 ide_handler_t
*handler
;
1595 ide_startstop_t startstop
;
1597 spin_lock_irqsave(&ide_lock
, flags
);
1598 hwif
= hwgroup
->hwif
;
1600 if (!ide_ack_intr(hwif
)) {
1601 spin_unlock_irqrestore(&ide_lock
, flags
);
1605 if ((handler
= hwgroup
->handler
) == NULL
|| hwgroup
->polling
) {
1607 * Not expecting an interrupt from this drive.
1608 * That means this could be:
1609 * (1) an interrupt from another PCI device
1610 * sharing the same PCI INT# as us.
1611 * or (2) a drive just entered sleep or standby mode,
1612 * and is interrupting to let us know.
1613 * or (3) a spurious interrupt of unknown origin.
1615 * For PCI, we cannot tell the difference,
1616 * so in that case we just ignore it and hope it goes away.
1618 * FIXME: unexpected_intr should be hwif-> then we can
1619 * remove all the ifdef PCI crap
1621 #ifdef CONFIG_BLK_DEV_IDEPCI
1622 if (hwif
->pci_dev
&& !hwif
->pci_dev
->vendor
)
1623 #endif /* CONFIG_BLK_DEV_IDEPCI */
1626 * Probably not a shared PCI interrupt,
1627 * so we can safely try to do something about it:
1629 unexpected_intr(irq
, hwgroup
);
1630 #ifdef CONFIG_BLK_DEV_IDEPCI
1633 * Whack the status register, just in case
1634 * we have a leftover pending IRQ.
1636 (void) hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1637 #endif /* CONFIG_BLK_DEV_IDEPCI */
1639 spin_unlock_irqrestore(&ide_lock
, flags
);
1642 drive
= hwgroup
->drive
;
1645 * This should NEVER happen, and there isn't much
1646 * we could do about it here.
1648 * [Note - this can occur if the drive is hot unplugged]
1650 spin_unlock_irqrestore(&ide_lock
, flags
);
1653 if (!drive_is_ready(drive
)) {
1655 * This happens regularly when we share a PCI IRQ with
1656 * another device. Unfortunately, it can also happen
1657 * with some buggy drives that trigger the IRQ before
1658 * their status register is up to date. Hopefully we have
1659 * enough advance overhead that the latter isn't a problem.
1661 spin_unlock_irqrestore(&ide_lock
, flags
);
1664 if (!hwgroup
->busy
) {
1665 hwgroup
->busy
= 1; /* paranoia */
1666 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1668 hwgroup
->handler
= NULL
;
1670 del_timer(&hwgroup
->timer
);
1671 spin_unlock(&ide_lock
);
1673 /* Some controllers might set DMA INTR no matter DMA or PIO;
1674 * bmdma status might need to be cleared even for
1675 * PIO interrupts to prevent spurious/lost irq.
1677 if (hwif
->ide_dma_clear_irq
&& !(drive
->waiting_for_dma
))
1678 /* ide_dma_end() needs bmdma status for error checking.
1679 * So, skip clearing bmdma status here and leave it
1680 * to ide_dma_end() if this is dma interrupt.
1682 hwif
->ide_dma_clear_irq(drive
);
1685 local_irq_enable_in_hardirq();
1686 /* service this interrupt, may set handler for next interrupt */
1687 startstop
= handler(drive
);
1688 spin_lock_irq(&ide_lock
);
1691 * Note that handler() may have set things up for another
1692 * interrupt to occur soon, but it cannot happen until
1693 * we exit from this routine, because it will be the
1694 * same irq as is currently being serviced here, and Linux
1695 * won't allow another of the same (on any CPU) until we return.
1697 drive
->service_time
= jiffies
- drive
->service_start
;
1698 if (startstop
== ide_stopped
) {
1699 if (hwgroup
->handler
== NULL
) { /* paranoia */
1701 ide_do_request(hwgroup
, hwif
->irq
);
1703 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1704 "on exit\n", drive
->name
);
1707 spin_unlock_irqrestore(&ide_lock
, flags
);
1712 * ide_init_drive_cmd - initialize a drive command request
1713 * @rq: request object
1715 * Initialize a request before we fill it in and send it down to
1716 * ide_do_drive_cmd. Commands must be set up by this function. Right
1717 * now it doesn't do a lot, but if that changes abusers will have a
1721 void ide_init_drive_cmd (struct request
*rq
)
1723 memset(rq
, 0, sizeof(*rq
));
1724 rq
->cmd_type
= REQ_TYPE_ATA_CMD
;
1728 EXPORT_SYMBOL(ide_init_drive_cmd
);
1731 * ide_do_drive_cmd - issue IDE special command
1732 * @drive: device to issue command
1733 * @rq: request to issue
1734 * @action: action for processing
1736 * This function issues a special IDE device request
1737 * onto the request queue.
1739 * If action is ide_wait, then the rq is queued at the end of the
1740 * request queue, and the function sleeps until it has been processed.
1741 * This is for use when invoked from an ioctl handler.
1743 * If action is ide_preempt, then the rq is queued at the head of
1744 * the request queue, displacing the currently-being-processed
1745 * request and this function returns immediately without waiting
1746 * for the new rq to be completed. This is VERY DANGEROUS, and is
1747 * intended for careful use by the ATAPI tape/cdrom driver code.
1749 * If action is ide_end, then the rq is queued at the end of the
1750 * request queue, and the function returns immediately without waiting
1751 * for the new rq to be completed. This is again intended for careful
1752 * use by the ATAPI tape/cdrom driver code.
1755 int ide_do_drive_cmd (ide_drive_t
*drive
, struct request
*rq
, ide_action_t action
)
1757 unsigned long flags
;
1758 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1759 DECLARE_COMPLETION_ONSTACK(wait
);
1760 int where
= ELEVATOR_INSERT_BACK
, err
;
1761 int must_wait
= (action
== ide_wait
|| action
== ide_head_wait
);
1766 * we need to hold an extra reference to request for safe inspection
1771 rq
->end_io_data
= &wait
;
1772 rq
->end_io
= blk_end_sync_rq
;
1775 spin_lock_irqsave(&ide_lock
, flags
);
1776 if (action
== ide_preempt
)
1778 if (action
== ide_preempt
|| action
== ide_head_wait
) {
1779 where
= ELEVATOR_INSERT_FRONT
;
1780 rq
->cmd_flags
|= REQ_PREEMPT
;
1782 __elv_add_request(drive
->queue
, rq
, where
, 0);
1783 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1784 spin_unlock_irqrestore(&ide_lock
, flags
);
1788 wait_for_completion(&wait
);
1792 blk_put_request(rq
);
1798 EXPORT_SYMBOL(ide_do_drive_cmd
);