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
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_FLUSH_CACHE_EXT
;
194 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_FLUSH_CACHE
;
195 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
196 args
->handler
= &task_no_data_intr
;
197 return do_rw_taskfile(drive
, args
);
199 case idedisk_pm_standby
: /* Suspend step 2 (standby) */
200 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_STANDBYNOW1
;
201 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
202 args
->handler
= &task_no_data_intr
;
203 return do_rw_taskfile(drive
, args
);
205 case idedisk_pm_restore_pio
: /* Resume step 1 (restore PIO) */
206 ide_set_max_pio(drive
);
208 * skip idedisk_pm_idle for ATAPI devices
210 if (drive
->media
!= ide_disk
)
211 pm
->pm_step
= ide_pm_restore_dma
;
213 ide_complete_power_step(drive
, rq
, 0, 0);
216 case idedisk_pm_idle
: /* Resume step 2 (idle) */
217 args
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_IDLEIMMEDIATE
;
218 args
->command_type
= IDE_DRIVE_TASK_NO_DATA
;
219 args
->handler
= task_no_data_intr
;
220 return do_rw_taskfile(drive
, args
);
222 case ide_pm_restore_dma
: /* Resume step 3 (restore DMA) */
224 * Right now, all we do is call ide_set_dma(drive),
225 * we could be smarter and check for current xfer_speed
226 * in struct drive etc...
228 if (drive
->hwif
->ide_dma_on
== NULL
)
230 drive
->hwif
->dma_off_quietly(drive
);
232 * TODO: respect ->using_dma setting
237 pm
->pm_step
= ide_pm_state_completed
;
242 * ide_end_dequeued_request - complete an IDE I/O
243 * @drive: IDE device for the I/O
245 * @nr_sectors: number of sectors completed
247 * Complete an I/O that is no longer on the request queue. This
248 * typically occurs when we pull the request and issue a REQUEST_SENSE.
249 * We must still finish the old request but we must not tamper with the
250 * queue in the meantime.
252 * NOTE: This path does not handle barrier, but barrier is not supported
256 int ide_end_dequeued_request(ide_drive_t
*drive
, struct request
*rq
,
257 int uptodate
, int nr_sectors
)
262 spin_lock_irqsave(&ide_lock
, flags
);
263 BUG_ON(!blk_rq_started(rq
));
264 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_sectors
<< 9, 0);
265 spin_unlock_irqrestore(&ide_lock
, flags
);
269 EXPORT_SYMBOL_GPL(ide_end_dequeued_request
);
273 * ide_complete_pm_request - end the current Power Management request
274 * @drive: target drive
277 * This function cleans up the current PM request and stops the queue
280 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
285 printk("%s: completing PM request, %s\n", drive
->name
,
286 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
288 spin_lock_irqsave(&ide_lock
, flags
);
289 if (blk_pm_suspend_request(rq
)) {
290 blk_stop_queue(drive
->queue
);
293 blk_start_queue(drive
->queue
);
295 blkdev_dequeue_request(rq
);
296 HWGROUP(drive
)->rq
= NULL
;
297 end_that_request_last(rq
, 1);
298 spin_unlock_irqrestore(&ide_lock
, flags
);
302 * ide_end_drive_cmd - end an explicit drive command
307 * Clean up after success/failure of an explicit drive command.
308 * These get thrown onto the queue so they are synchronized with
309 * real I/O operations on the drive.
311 * In LBA48 mode we have to read the register set twice to get
312 * all the extra information out.
315 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
317 ide_hwif_t
*hwif
= HWIF(drive
);
321 spin_lock_irqsave(&ide_lock
, flags
);
322 rq
= HWGROUP(drive
)->rq
;
323 spin_unlock_irqrestore(&ide_lock
, flags
);
325 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
326 u8
*args
= (u8
*) rq
->buffer
;
328 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
333 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
335 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
336 u8
*args
= (u8
*) rq
->buffer
;
338 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
343 /* be sure we're looking at the low order bits */
344 hwif
->OUTB(drive
->ctl
& ~0x80, IDE_CONTROL_REG
);
345 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
346 args
[3] = hwif
->INB(IDE_SECTOR_REG
);
347 args
[4] = hwif
->INB(IDE_LCYL_REG
);
348 args
[5] = hwif
->INB(IDE_HCYL_REG
);
349 args
[6] = hwif
->INB(IDE_SELECT_REG
);
351 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
352 ide_task_t
*args
= (ide_task_t
*) rq
->special
;
354 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
357 if (args
->tf_in_flags
.b
.data
) {
358 u16 data
= hwif
->INW(IDE_DATA_REG
);
359 args
->tfRegister
[IDE_DATA_OFFSET
] = (data
) & 0xFF;
360 args
->hobRegister
[IDE_DATA_OFFSET
] = (data
>> 8) & 0xFF;
362 args
->tfRegister
[IDE_ERROR_OFFSET
] = err
;
363 /* be sure we're looking at the low order bits */
364 hwif
->OUTB(drive
->ctl
& ~0x80, IDE_CONTROL_REG
);
365 args
->tfRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
366 args
->tfRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
367 args
->tfRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
368 args
->tfRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
369 args
->tfRegister
[IDE_SELECT_OFFSET
] = hwif
->INB(IDE_SELECT_REG
);
370 args
->tfRegister
[IDE_STATUS_OFFSET
] = stat
;
372 if (drive
->addressing
== 1) {
373 hwif
->OUTB(drive
->ctl
|0x80, IDE_CONTROL_REG
);
374 args
->hobRegister
[IDE_FEATURE_OFFSET
] = hwif
->INB(IDE_FEATURE_REG
);
375 args
->hobRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
376 args
->hobRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
377 args
->hobRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
378 args
->hobRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
381 } else if (blk_pm_request(rq
)) {
382 struct request_pm_state
*pm
= rq
->data
;
384 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
385 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
387 ide_complete_power_step(drive
, rq
, stat
, err
);
388 if (pm
->pm_step
== ide_pm_state_completed
)
389 ide_complete_pm_request(drive
, rq
);
393 spin_lock_irqsave(&ide_lock
, flags
);
394 blkdev_dequeue_request(rq
);
395 HWGROUP(drive
)->rq
= NULL
;
397 end_that_request_last(rq
, !rq
->errors
);
398 spin_unlock_irqrestore(&ide_lock
, flags
);
401 EXPORT_SYMBOL(ide_end_drive_cmd
);
404 * try_to_flush_leftover_data - flush junk
405 * @drive: drive to flush
407 * try_to_flush_leftover_data() is invoked in response to a drive
408 * unexpectedly having its DRQ_STAT bit set. As an alternative to
409 * resetting the drive, this routine tries to clear the condition
410 * by read a sector's worth of data from the drive. Of course,
411 * this may not help if the drive is *waiting* for data from *us*.
413 static void try_to_flush_leftover_data (ide_drive_t
*drive
)
415 int i
= (drive
->mult_count
? drive
->mult_count
: 1) * SECTOR_WORDS
;
417 if (drive
->media
!= ide_disk
)
421 u32 wcount
= (i
> 16) ? 16 : i
;
424 HWIF(drive
)->ata_input_data(drive
, buffer
, wcount
);
428 static void ide_kill_rq(ide_drive_t
*drive
, struct request
*rq
)
433 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
434 drv
->end_request(drive
, 0, 0);
436 ide_end_request(drive
, 0, 0);
439 static ide_startstop_t
ide_ata_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
441 ide_hwif_t
*hwif
= drive
->hwif
;
443 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
444 /* other bits are useless when BUSY */
445 rq
->errors
|= ERROR_RESET
;
446 } else if (stat
& ERR_STAT
) {
447 /* err has different meaning on cdrom and tape */
448 if (err
== ABRT_ERR
) {
449 if (drive
->select
.b
.lba
&&
450 /* some newer drives don't support WIN_SPECIFY */
451 hwif
->INB(IDE_COMMAND_REG
) == WIN_SPECIFY
)
453 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
454 /* UDMA crc error, just retry the operation */
456 } else if (err
& (BBD_ERR
| ECC_ERR
)) {
457 /* retries won't help these */
458 rq
->errors
= ERROR_MAX
;
459 } else if (err
& TRK0_ERR
) {
460 /* help it find track zero */
461 rq
->errors
|= ERROR_RECAL
;
465 if ((stat
& DRQ_STAT
) && rq_data_dir(rq
) == READ
&&
466 (hwif
->host_flags
& IDE_HFLAG_ERROR_STOPS_FIFO
) == 0)
467 try_to_flush_leftover_data(drive
);
469 if (rq
->errors
>= ERROR_MAX
|| blk_noretry_request(rq
)) {
470 ide_kill_rq(drive
, rq
);
474 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
475 rq
->errors
|= ERROR_RESET
;
477 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
479 return ide_do_reset(drive
);
482 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
483 drive
->special
.b
.recalibrate
= 1;
490 static ide_startstop_t
ide_atapi_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
492 ide_hwif_t
*hwif
= drive
->hwif
;
494 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
495 /* other bits are useless when BUSY */
496 rq
->errors
|= ERROR_RESET
;
498 /* add decoding error stuff */
501 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
))
503 hwif
->OUTB(WIN_IDLEIMMEDIATE
, IDE_COMMAND_REG
);
505 if (rq
->errors
>= ERROR_MAX
) {
506 ide_kill_rq(drive
, rq
);
508 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
510 return ide_do_reset(drive
);
519 __ide_error(ide_drive_t
*drive
, struct request
*rq
, u8 stat
, u8 err
)
521 if (drive
->media
== ide_disk
)
522 return ide_ata_error(drive
, rq
, stat
, err
);
523 return ide_atapi_error(drive
, rq
, stat
, err
);
526 EXPORT_SYMBOL_GPL(__ide_error
);
529 * ide_error - handle an error on the IDE
530 * @drive: drive the error occurred on
531 * @msg: message to report
534 * ide_error() takes action based on the error returned by the drive.
535 * For normal I/O that may well include retries. We deal with
536 * both new-style (taskfile) and old style command handling here.
537 * In the case of taskfile command handling there is work left to
541 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
546 err
= ide_dump_status(drive
, msg
, stat
);
548 if ((rq
= HWGROUP(drive
)->rq
) == NULL
)
551 /* retry only "normal" I/O: */
552 if (!blk_fs_request(rq
)) {
554 ide_end_drive_cmd(drive
, stat
, err
);
561 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
562 return drv
->error(drive
, rq
, stat
, err
);
564 return __ide_error(drive
, rq
, stat
, err
);
567 EXPORT_SYMBOL_GPL(ide_error
);
569 ide_startstop_t
__ide_abort(ide_drive_t
*drive
, struct request
*rq
)
571 if (drive
->media
!= ide_disk
)
572 rq
->errors
|= ERROR_RESET
;
574 ide_kill_rq(drive
, rq
);
579 EXPORT_SYMBOL_GPL(__ide_abort
);
582 * ide_abort - abort pending IDE operations
583 * @drive: drive the error occurred on
584 * @msg: message to report
586 * ide_abort kills and cleans up when we are about to do a
587 * host initiated reset on active commands. Longer term we
588 * want handlers to have sensible abort handling themselves
590 * This differs fundamentally from ide_error because in
591 * this case the command is doing just fine when we
595 ide_startstop_t
ide_abort(ide_drive_t
*drive
, const char *msg
)
599 if (drive
== NULL
|| (rq
= HWGROUP(drive
)->rq
) == NULL
)
602 /* retry only "normal" I/O: */
603 if (!blk_fs_request(rq
)) {
605 ide_end_drive_cmd(drive
, BUSY_STAT
, 0);
612 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
613 return drv
->abort(drive
, rq
);
615 return __ide_abort(drive
, rq
);
619 * ide_cmd - issue a simple drive command
620 * @drive: drive the command is for
622 * @nsect: sector byte
623 * @handler: handler for the command completion
625 * Issue a simple drive command with interrupts.
626 * The drive must be selected beforehand.
629 static void ide_cmd (ide_drive_t
*drive
, u8 cmd
, u8 nsect
,
630 ide_handler_t
*handler
)
632 ide_hwif_t
*hwif
= HWIF(drive
);
634 hwif
->OUTB(drive
->ctl
,IDE_CONTROL_REG
); /* clear nIEN */
635 SELECT_MASK(drive
,0);
636 hwif
->OUTB(nsect
,IDE_NSECTOR_REG
);
637 ide_execute_command(drive
, cmd
, handler
, WAIT_CMD
, NULL
);
641 * drive_cmd_intr - drive command completion interrupt
642 * @drive: drive the completion interrupt occurred on
644 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
645 * We do any necessary data reading and then wait for the drive to
646 * go non busy. At that point we may read the error data and complete
650 static ide_startstop_t
drive_cmd_intr (ide_drive_t
*drive
)
652 struct request
*rq
= HWGROUP(drive
)->rq
;
653 ide_hwif_t
*hwif
= HWIF(drive
);
654 u8
*args
= (u8
*) rq
->buffer
;
655 u8 stat
= hwif
->INB(IDE_STATUS_REG
);
658 local_irq_enable_in_hardirq();
659 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
&&
660 (stat
& DRQ_STAT
) && args
&& args
[3]) {
661 u8 io_32bit
= drive
->io_32bit
;
663 hwif
->ata_input_data(drive
, &args
[4], args
[3] * SECTOR_WORDS
);
664 drive
->io_32bit
= io_32bit
;
665 while (((stat
= hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) && retries
--)
669 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
))
670 return ide_error(drive
, "drive_cmd", stat
);
671 /* calls ide_end_drive_cmd */
672 ide_end_drive_cmd(drive
, stat
, hwif
->INB(IDE_ERROR_REG
));
676 static void ide_init_specify_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
678 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->sect
;
679 task
->tfRegister
[IDE_SECTOR_OFFSET
] = drive
->sect
;
680 task
->tfRegister
[IDE_LCYL_OFFSET
] = drive
->cyl
;
681 task
->tfRegister
[IDE_HCYL_OFFSET
] = drive
->cyl
>>8;
682 task
->tfRegister
[IDE_SELECT_OFFSET
] = ((drive
->head
-1)|drive
->select
.all
)&0xBF;
683 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_SPECIFY
;
685 task
->handler
= &set_geometry_intr
;
688 static void ide_init_restore_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
690 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->sect
;
691 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_RESTORE
;
693 task
->handler
= &recal_intr
;
696 static void ide_init_setmult_cmd(ide_drive_t
*drive
, ide_task_t
*task
)
698 task
->tfRegister
[IDE_NSECTOR_OFFSET
] = drive
->mult_req
;
699 task
->tfRegister
[IDE_COMMAND_OFFSET
] = WIN_SETMULT
;
701 task
->handler
= &set_multmode_intr
;
704 static ide_startstop_t
ide_disk_special(ide_drive_t
*drive
)
706 special_t
*s
= &drive
->special
;
709 memset(&args
, 0, sizeof(ide_task_t
));
710 args
.command_type
= IDE_DRIVE_TASK_NO_DATA
;
712 if (s
->b
.set_geometry
) {
713 s
->b
.set_geometry
= 0;
714 ide_init_specify_cmd(drive
, &args
);
715 } else if (s
->b
.recalibrate
) {
716 s
->b
.recalibrate
= 0;
717 ide_init_restore_cmd(drive
, &args
);
718 } else if (s
->b
.set_multmode
) {
719 s
->b
.set_multmode
= 0;
720 if (drive
->mult_req
> drive
->id
->max_multsect
)
721 drive
->mult_req
= drive
->id
->max_multsect
;
722 ide_init_setmult_cmd(drive
, &args
);
724 int special
= s
->all
;
726 printk(KERN_ERR
"%s: bad special flag: 0x%02x\n", drive
->name
, special
);
730 do_rw_taskfile(drive
, &args
);
736 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
738 static int set_pio_mode_abuse(ide_hwif_t
*hwif
, u8 req_pio
)
747 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_DMA_MODES
) ? 1 : 0;
750 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_PREFETCH
) ? 1 : 0;
753 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_FAST_DEVSEL
) ? 1 : 0;
760 * do_special - issue some special commands
761 * @drive: drive the command is for
763 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
764 * commands to a drive. It used to do much more, but has been scaled
768 static ide_startstop_t
do_special (ide_drive_t
*drive
)
770 special_t
*s
= &drive
->special
;
773 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
776 ide_hwif_t
*hwif
= drive
->hwif
;
777 u8 req_pio
= drive
->tune_req
;
781 if (set_pio_mode_abuse(drive
->hwif
, req_pio
)) {
783 if (hwif
->set_pio_mode
== NULL
)
787 * take ide_lock for drive->[no_]unmask/[no_]io_32bit
789 if (req_pio
== 8 || req_pio
== 9) {
792 spin_lock_irqsave(&ide_lock
, flags
);
793 hwif
->set_pio_mode(drive
, req_pio
);
794 spin_unlock_irqrestore(&ide_lock
, flags
);
796 hwif
->set_pio_mode(drive
, req_pio
);
798 int keep_dma
= drive
->using_dma
;
800 ide_set_pio(drive
, req_pio
);
802 if (hwif
->host_flags
& IDE_HFLAG_SET_PIO_MODE_KEEP_DMA
) {
804 hwif
->ide_dma_on(drive
);
810 if (drive
->media
== ide_disk
)
811 return ide_disk_special(drive
);
819 void ide_map_sg(ide_drive_t
*drive
, struct request
*rq
)
821 ide_hwif_t
*hwif
= drive
->hwif
;
822 struct scatterlist
*sg
= hwif
->sg_table
;
824 if (hwif
->sg_mapped
) /* needed by ide-scsi */
827 if (rq
->cmd_type
!= REQ_TYPE_ATA_TASKFILE
) {
828 hwif
->sg_nents
= blk_rq_map_sg(drive
->queue
, rq
, sg
);
830 sg_init_one(sg
, rq
->buffer
, rq
->nr_sectors
* SECTOR_SIZE
);
835 EXPORT_SYMBOL_GPL(ide_map_sg
);
837 void ide_init_sg_cmd(ide_drive_t
*drive
, struct request
*rq
)
839 ide_hwif_t
*hwif
= drive
->hwif
;
841 hwif
->nsect
= hwif
->nleft
= rq
->nr_sectors
;
846 EXPORT_SYMBOL_GPL(ide_init_sg_cmd
);
849 * execute_drive_command - issue special drive command
850 * @drive: the drive to issue the command on
851 * @rq: the request structure holding the command
853 * execute_drive_cmd() issues a special drive command, usually
854 * initiated by ioctl() from the external hdparm program. The
855 * command can be a drive command, drive task or taskfile
856 * operation. Weirdly you can call it with NULL to wait for
857 * all commands to finish. Don't do this as that is due to change
860 static ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
,
863 ide_hwif_t
*hwif
= HWIF(drive
);
864 if (rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
) {
865 ide_task_t
*args
= rq
->special
;
870 hwif
->data_phase
= args
->data_phase
;
872 switch (hwif
->data_phase
) {
873 case TASKFILE_MULTI_OUT
:
875 case TASKFILE_MULTI_IN
:
877 ide_init_sg_cmd(drive
, rq
);
878 ide_map_sg(drive
, rq
);
883 if (args
->tf_out_flags
.all
!= 0)
884 return flagged_taskfile(drive
, args
);
885 return do_rw_taskfile(drive
, args
);
886 } else if (rq
->cmd_type
== REQ_TYPE_ATA_TASK
) {
887 u8
*args
= rq
->buffer
;
892 printk("%s: DRIVE_TASK_CMD ", drive
->name
);
893 printk("cmd=0x%02x ", args
[0]);
894 printk("fr=0x%02x ", args
[1]);
895 printk("ns=0x%02x ", args
[2]);
896 printk("sc=0x%02x ", args
[3]);
897 printk("lcyl=0x%02x ", args
[4]);
898 printk("hcyl=0x%02x ", args
[5]);
899 printk("sel=0x%02x\n", args
[6]);
901 hwif
->OUTB(args
[1], IDE_FEATURE_REG
);
902 hwif
->OUTB(args
[3], IDE_SECTOR_REG
);
903 hwif
->OUTB(args
[4], IDE_LCYL_REG
);
904 hwif
->OUTB(args
[5], IDE_HCYL_REG
);
905 hwif
->OUTB((args
[6] & 0xEF)|drive
->select
.all
, IDE_SELECT_REG
);
906 ide_cmd(drive
, args
[0], args
[2], &drive_cmd_intr
);
908 } else if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
) {
909 u8
*args
= rq
->buffer
;
914 printk("%s: DRIVE_CMD ", drive
->name
);
915 printk("cmd=0x%02x ", args
[0]);
916 printk("sc=0x%02x ", args
[1]);
917 printk("fr=0x%02x ", args
[2]);
918 printk("xx=0x%02x\n", args
[3]);
920 if (args
[0] == WIN_SMART
) {
921 hwif
->OUTB(0x4f, IDE_LCYL_REG
);
922 hwif
->OUTB(0xc2, IDE_HCYL_REG
);
923 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
924 hwif
->OUTB(args
[1],IDE_SECTOR_REG
);
925 ide_cmd(drive
, args
[0], args
[3], &drive_cmd_intr
);
928 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
929 ide_cmd(drive
, args
[0], args
[1], &drive_cmd_intr
);
935 * NULL is actually a valid way of waiting for
936 * all current requests to be flushed from the queue.
939 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
941 ide_end_drive_cmd(drive
,
942 hwif
->INB(IDE_STATUS_REG
),
943 hwif
->INB(IDE_ERROR_REG
));
947 static void ide_check_pm_state(ide_drive_t
*drive
, struct request
*rq
)
949 struct request_pm_state
*pm
= rq
->data
;
951 if (blk_pm_suspend_request(rq
) &&
952 pm
->pm_step
== ide_pm_state_start_suspend
)
953 /* Mark drive blocked when starting the suspend sequence. */
955 else if (blk_pm_resume_request(rq
) &&
956 pm
->pm_step
== ide_pm_state_start_resume
) {
958 * The first thing we do on wakeup is to wait for BSY bit to
959 * go away (with a looong timeout) as a drive on this hwif may
960 * just be POSTing itself.
961 * We do that before even selecting as the "other" device on
962 * the bus may be broken enough to walk on our toes at this
967 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
969 rc
= ide_wait_not_busy(HWIF(drive
), 35000);
971 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
973 HWIF(drive
)->OUTB(8, HWIF(drive
)->io_ports
[IDE_CONTROL_OFFSET
]);
974 rc
= ide_wait_not_busy(HWIF(drive
), 100000);
976 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
981 * start_request - start of I/O and command issuing for IDE
983 * start_request() initiates handling of a new I/O request. It
984 * accepts commands and I/O (read/write) requests. It also does
985 * the final remapping for weird stuff like EZDrive. Once
986 * device mapper can work sector level the EZDrive stuff can go away
988 * FIXME: this function needs a rename
991 static ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
993 ide_startstop_t startstop
;
996 BUG_ON(!blk_rq_started(rq
));
999 printk("%s: start_request: current=0x%08lx\n",
1000 HWIF(drive
)->name
, (unsigned long) rq
);
1003 /* bail early if we've exceeded max_failures */
1004 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
1009 if (blk_fs_request(rq
) &&
1010 (drive
->media
== ide_disk
|| drive
->media
== ide_floppy
)) {
1011 block
+= drive
->sect0
;
1013 /* Yecch - this will shift the entire interval,
1014 possibly killing some innocent following sector */
1015 if (block
== 0 && drive
->remap_0_to_1
== 1)
1016 block
= 1; /* redirect MBR access to EZ-Drive partn table */
1018 if (blk_pm_request(rq
))
1019 ide_check_pm_state(drive
, rq
);
1021 SELECT_DRIVE(drive
);
1022 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
, BUSY_STAT
|DRQ_STAT
, WAIT_READY
)) {
1023 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
1026 if (!drive
->special
.all
) {
1030 * We reset the drive so we need to issue a SETFEATURES.
1031 * Do it _after_ do_special() restored device parameters.
1033 if (drive
->current_speed
== 0xff)
1034 ide_config_drive_speed(drive
, drive
->desired_speed
);
1036 if (rq
->cmd_type
== REQ_TYPE_ATA_CMD
||
1037 rq
->cmd_type
== REQ_TYPE_ATA_TASK
||
1038 rq
->cmd_type
== REQ_TYPE_ATA_TASKFILE
)
1039 return execute_drive_cmd(drive
, rq
);
1040 else if (blk_pm_request(rq
)) {
1041 struct request_pm_state
*pm
= rq
->data
;
1043 printk("%s: start_power_step(step: %d)\n",
1044 drive
->name
, rq
->pm
->pm_step
);
1046 startstop
= ide_start_power_step(drive
, rq
);
1047 if (startstop
== ide_stopped
&&
1048 pm
->pm_step
== ide_pm_state_completed
)
1049 ide_complete_pm_request(drive
, rq
);
1053 drv
= *(ide_driver_t
**)rq
->rq_disk
->private_data
;
1054 return drv
->do_request(drive
, rq
, block
);
1056 return do_special(drive
);
1058 ide_kill_rq(drive
, rq
);
1063 * ide_stall_queue - pause an IDE device
1064 * @drive: drive to stall
1065 * @timeout: time to stall for (jiffies)
1067 * ide_stall_queue() can be used by a drive to give excess bandwidth back
1068 * to the hwgroup by sleeping for timeout jiffies.
1071 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
1073 if (timeout
> WAIT_WORSTCASE
)
1074 timeout
= WAIT_WORSTCASE
;
1075 drive
->sleep
= timeout
+ jiffies
;
1076 drive
->sleeping
= 1;
1079 EXPORT_SYMBOL(ide_stall_queue
);
1081 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
1084 * choose_drive - select a drive to service
1085 * @hwgroup: hardware group to select on
1087 * choose_drive() selects the next drive which will be serviced.
1088 * This is necessary because the IDE layer can't issue commands
1089 * to both drives on the same cable, unlike SCSI.
1092 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
1094 ide_drive_t
*drive
, *best
;
1098 drive
= hwgroup
->drive
;
1101 * drive is doing pre-flush, ordered write, post-flush sequence. even
1102 * though that is 3 requests, it must be seen as a single transaction.
1103 * we must not preempt this drive until that is complete
1105 if (blk_queue_flushing(drive
->queue
)) {
1107 * small race where queue could get replugged during
1108 * the 3-request flush cycle, just yank the plug since
1109 * we want it to finish asap
1111 blk_remove_plug(drive
->queue
);
1116 if ((!drive
->sleeping
|| time_after_eq(jiffies
, drive
->sleep
))
1117 && !elv_queue_empty(drive
->queue
)) {
1119 || (drive
->sleeping
&& (!best
->sleeping
|| time_before(drive
->sleep
, best
->sleep
)))
1120 || (!best
->sleeping
&& time_before(WAKEUP(drive
), WAKEUP(best
))))
1122 if (!blk_queue_plugged(drive
->queue
))
1126 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1127 if (best
&& best
->nice1
&& !best
->sleeping
&& best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
1128 long t
= (signed long)(WAKEUP(best
) - jiffies
);
1129 if (t
>= WAIT_MIN_SLEEP
) {
1131 * We *may* have some time to spare, but first let's see if
1132 * someone can potentially benefit from our nice mood today..
1136 if (!drive
->sleeping
1137 && time_before(jiffies
- best
->service_time
, WAKEUP(drive
))
1138 && time_before(WAKEUP(drive
), jiffies
+ t
))
1140 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
1143 } while ((drive
= drive
->next
) != best
);
1150 * Issue a new request to a drive from hwgroup
1151 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
1153 * A hwgroup is a serialized group of IDE interfaces. Usually there is
1154 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
1155 * may have both interfaces in a single hwgroup to "serialize" access.
1156 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
1157 * together into one hwgroup for serialized access.
1159 * Note also that several hwgroups can end up sharing a single IRQ,
1160 * possibly along with many other devices. This is especially common in
1161 * PCI-based systems with off-board IDE controller cards.
1163 * The IDE driver uses the single global ide_lock spinlock to protect
1164 * access to the request queues, and to protect the hwgroup->busy flag.
1166 * The first thread into the driver for a particular hwgroup sets the
1167 * hwgroup->busy flag to indicate that this hwgroup is now active,
1168 * and then initiates processing of the top request from the request queue.
1170 * Other threads attempting entry notice the busy setting, and will simply
1171 * queue their new requests and exit immediately. Note that hwgroup->busy
1172 * remains set even when the driver is merely awaiting the next interrupt.
1173 * Thus, the meaning is "this hwgroup is busy processing a request".
1175 * When processing of a request completes, the completing thread or IRQ-handler
1176 * will start the next request from the queue. If no more work remains,
1177 * the driver will clear the hwgroup->busy flag and exit.
1179 * The ide_lock (spinlock) is used to protect all access to the
1180 * hwgroup->busy flag, but is otherwise not needed for most processing in
1181 * the driver. This makes the driver much more friendlier to shared IRQs
1182 * than previous designs, while remaining 100% (?) SMP safe and capable.
1184 static void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
1189 ide_startstop_t startstop
;
1192 /* for atari only: POSSIBLY BROKEN HERE(?) */
1193 ide_get_lock(ide_intr
, hwgroup
);
1195 /* caller must own ide_lock */
1196 BUG_ON(!irqs_disabled());
1198 while (!hwgroup
->busy
) {
1200 drive
= choose_drive(hwgroup
);
1201 if (drive
== NULL
) {
1203 unsigned long sleep
= 0; /* shut up, gcc */
1205 drive
= hwgroup
->drive
;
1207 if (drive
->sleeping
&& (!sleeping
|| time_before(drive
->sleep
, sleep
))) {
1209 sleep
= drive
->sleep
;
1211 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1214 * Take a short snooze, and then wake up this hwgroup again.
1215 * This gives other hwgroups on the same a chance to
1216 * play fairly with us, just in case there are big differences
1217 * in relative throughputs.. don't want to hog the cpu too much.
1219 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
1220 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
1222 if (timer_pending(&hwgroup
->timer
))
1223 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
1225 /* so that ide_timer_expiry knows what to do */
1226 hwgroup
->sleeping
= 1;
1227 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1228 mod_timer(&hwgroup
->timer
, sleep
);
1229 /* we purposely leave hwgroup->busy==1
1232 /* Ugly, but how can we sleep for the lock
1233 * otherwise? perhaps from tq_disk?
1236 /* for atari only */
1241 /* no more work for this hwgroup (for now) */
1246 if (hwgroup
->hwif
->sharing_irq
&&
1247 hwif
!= hwgroup
->hwif
&&
1248 hwif
->io_ports
[IDE_CONTROL_OFFSET
]) {
1249 /* set nIEN for previous hwif */
1250 SELECT_INTERRUPT(drive
);
1252 hwgroup
->hwif
= hwif
;
1253 hwgroup
->drive
= drive
;
1254 drive
->sleeping
= 0;
1255 drive
->service_start
= jiffies
;
1257 if (blk_queue_plugged(drive
->queue
)) {
1258 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1263 * we know that the queue isn't empty, but this can happen
1264 * if the q->prep_rq_fn() decides to kill a request
1266 rq
= elv_next_request(drive
->queue
);
1273 * Sanity: don't accept a request that isn't a PM request
1274 * if we are currently power managed. This is very important as
1275 * blk_stop_queue() doesn't prevent the elv_next_request()
1276 * above to return us whatever is in the queue. Since we call
1277 * ide_do_request() ourselves, we end up taking requests while
1278 * the queue is blocked...
1280 * We let requests forced at head of queue with ide-preempt
1281 * though. I hope that doesn't happen too much, hopefully not
1282 * unless the subdriver triggers such a thing in its own PM
1285 * We count how many times we loop here to make sure we service
1286 * all drives in the hwgroup without looping for ever
1288 if (drive
->blocked
&& !blk_pm_request(rq
) && !(rq
->cmd_flags
& REQ_PREEMPT
)) {
1289 drive
= drive
->next
? drive
->next
: hwgroup
->drive
;
1290 if (loops
++ < 4 && !blk_queue_plugged(drive
->queue
))
1292 /* We clear busy, there should be no pending ATA command at this point. */
1300 * Some systems have trouble with IDE IRQs arriving while
1301 * the driver is still setting things up. So, here we disable
1302 * the IRQ used by this interface while the request is being started.
1303 * This may look bad at first, but pretty much the same thing
1304 * happens anyway when any interrupt comes in, IDE or otherwise
1305 * -- the kernel masks the IRQ while it is being handled.
1307 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1308 disable_irq_nosync(hwif
->irq
);
1309 spin_unlock(&ide_lock
);
1310 local_irq_enable_in_hardirq();
1311 /* allow other IRQs while we start this request */
1312 startstop
= start_request(drive
, rq
);
1313 spin_lock_irq(&ide_lock
);
1314 if (masked_irq
!= IDE_NO_IRQ
&& hwif
->irq
!= masked_irq
)
1315 enable_irq(hwif
->irq
);
1316 if (startstop
== ide_stopped
)
1322 * Passes the stuff to ide_do_request
1324 void do_ide_request(struct request_queue
*q
)
1326 ide_drive_t
*drive
= q
->queuedata
;
1328 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1332 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1333 * retry the current request in pio mode instead of risking tossing it
1336 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1338 ide_hwif_t
*hwif
= HWIF(drive
);
1340 ide_startstop_t ret
= ide_stopped
;
1343 * end current dma transaction
1347 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1348 (void)HWIF(drive
)->ide_dma_end(drive
);
1349 ret
= ide_error(drive
, "dma timeout error",
1350 hwif
->INB(IDE_STATUS_REG
));
1352 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1353 hwif
->dma_timeout(drive
);
1357 * disable dma for now, but remember that we did so because of
1358 * a timeout -- we'll reenable after we finish this next request
1359 * (or rather the first chunk of it) in pio.
1362 drive
->state
= DMA_PIO_RETRY
;
1363 hwif
->dma_off_quietly(drive
);
1366 * un-busy drive etc (hwgroup->busy is cleared on return) and
1367 * make sure request is sane
1369 rq
= HWGROUP(drive
)->rq
;
1374 HWGROUP(drive
)->rq
= NULL
;
1381 rq
->sector
= rq
->bio
->bi_sector
;
1382 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1383 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1384 rq
->buffer
= bio_data(rq
->bio
);
1390 * ide_timer_expiry - handle lack of an IDE interrupt
1391 * @data: timer callback magic (hwgroup)
1393 * An IDE command has timed out before the expected drive return
1394 * occurred. At this point we attempt to clean up the current
1395 * mess. If the current handler includes an expiry handler then
1396 * we invoke the expiry handler, and providing it is happy the
1397 * work is done. If that fails we apply generic recovery rules
1398 * invoking the handler and checking the drive DMA status. We
1399 * have an excessively incestuous relationship with the DMA
1400 * logic that wants cleaning up.
1403 void ide_timer_expiry (unsigned long data
)
1405 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1406 ide_handler_t
*handler
;
1407 ide_expiry_t
*expiry
;
1408 unsigned long flags
;
1409 unsigned long wait
= -1;
1411 spin_lock_irqsave(&ide_lock
, flags
);
1413 if (((handler
= hwgroup
->handler
) == NULL
) ||
1414 (hwgroup
->req_gen
!= hwgroup
->req_gen_timer
)) {
1416 * Either a marginal timeout occurred
1417 * (got the interrupt just as timer expired),
1418 * or we were "sleeping" to give other devices a chance.
1419 * Either way, we don't really want to complain about anything.
1421 if (hwgroup
->sleeping
) {
1422 hwgroup
->sleeping
= 0;
1426 ide_drive_t
*drive
= hwgroup
->drive
;
1428 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1429 hwgroup
->handler
= NULL
;
1432 ide_startstop_t startstop
= ide_stopped
;
1433 if (!hwgroup
->busy
) {
1434 hwgroup
->busy
= 1; /* paranoia */
1435 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1437 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1439 if ((wait
= expiry(drive
)) > 0) {
1441 hwgroup
->timer
.expires
= jiffies
+ wait
;
1442 hwgroup
->req_gen_timer
= hwgroup
->req_gen
;
1443 add_timer(&hwgroup
->timer
);
1444 spin_unlock_irqrestore(&ide_lock
, flags
);
1448 hwgroup
->handler
= NULL
;
1450 * We need to simulate a real interrupt when invoking
1451 * the handler() function, which means we need to
1452 * globally mask the specific IRQ:
1454 spin_unlock(&ide_lock
);
1456 #if DISABLE_IRQ_NOSYNC
1457 disable_irq_nosync(hwif
->irq
);
1459 /* disable_irq_nosync ?? */
1460 disable_irq(hwif
->irq
);
1461 #endif /* DISABLE_IRQ_NOSYNC */
1463 * as if we were handling an interrupt */
1464 local_irq_disable();
1465 if (hwgroup
->polling
) {
1466 startstop
= handler(drive
);
1467 } else if (drive_is_ready(drive
)) {
1468 if (drive
->waiting_for_dma
)
1469 hwgroup
->hwif
->dma_lost_irq(drive
);
1470 (void)ide_ack_intr(hwif
);
1471 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1472 startstop
= handler(drive
);
1474 if (drive
->waiting_for_dma
) {
1475 startstop
= ide_dma_timeout_retry(drive
, wait
);
1478 ide_error(drive
, "irq timeout", hwif
->INB(IDE_STATUS_REG
));
1480 drive
->service_time
= jiffies
- drive
->service_start
;
1481 spin_lock_irq(&ide_lock
);
1482 enable_irq(hwif
->irq
);
1483 if (startstop
== ide_stopped
)
1487 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1488 spin_unlock_irqrestore(&ide_lock
, flags
);
1492 * unexpected_intr - handle an unexpected IDE interrupt
1493 * @irq: interrupt line
1494 * @hwgroup: hwgroup being processed
1496 * There's nothing really useful we can do with an unexpected interrupt,
1497 * other than reading the status register (to clear it), and logging it.
1498 * There should be no way that an irq can happen before we're ready for it,
1499 * so we needn't worry much about losing an "important" interrupt here.
1501 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1502 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1503 * looks "good", we just ignore the interrupt completely.
1505 * This routine assumes __cli() is in effect when called.
1507 * If an unexpected interrupt happens on irq15 while we are handling irq14
1508 * and if the two interfaces are "serialized" (CMD640), then it looks like
1509 * we could screw up by interfering with a new request being set up for
1512 * In reality, this is a non-issue. The new command is not sent unless
1513 * the drive is ready to accept one, in which case we know the drive is
1514 * not trying to interrupt us. And ide_set_handler() is always invoked
1515 * before completing the issuance of any new drive command, so we will not
1516 * be accidentally invoked as a result of any valid command completion
1519 * Note that we must walk the entire hwgroup here. We know which hwif
1520 * is doing the current command, but we don't know which hwif burped
1524 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1527 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1530 * handle the unexpected interrupt
1533 if (hwif
->irq
== irq
) {
1534 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1535 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
)) {
1536 /* Try to not flood the console with msgs */
1537 static unsigned long last_msgtime
, count
;
1539 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1540 last_msgtime
= jiffies
;
1541 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1542 "status=0x%02x, count=%ld\n",
1544 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1548 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1552 * ide_intr - default IDE interrupt handler
1553 * @irq: interrupt number
1554 * @dev_id: hwif group
1555 * @regs: unused weirdness from the kernel irq layer
1557 * This is the default IRQ handler for the IDE layer. You should
1558 * not need to override it. If you do be aware it is subtle in
1561 * hwgroup->hwif is the interface in the group currently performing
1562 * a command. hwgroup->drive is the drive and hwgroup->handler is
1563 * the IRQ handler to call. As we issue a command the handlers
1564 * step through multiple states, reassigning the handler to the
1565 * next step in the process. Unlike a smart SCSI controller IDE
1566 * expects the main processor to sequence the various transfer
1567 * stages. We also manage a poll timer to catch up with most
1568 * timeout situations. There are still a few where the handlers
1569 * don't ever decide to give up.
1571 * The handler eventually returns ide_stopped to indicate the
1572 * request completed. At this point we issue the next request
1573 * on the hwgroup and the process begins again.
1576 irqreturn_t
ide_intr (int irq
, void *dev_id
)
1578 unsigned long flags
;
1579 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1582 ide_handler_t
*handler
;
1583 ide_startstop_t startstop
;
1585 spin_lock_irqsave(&ide_lock
, flags
);
1586 hwif
= hwgroup
->hwif
;
1588 if (!ide_ack_intr(hwif
)) {
1589 spin_unlock_irqrestore(&ide_lock
, flags
);
1593 if ((handler
= hwgroup
->handler
) == NULL
|| hwgroup
->polling
) {
1595 * Not expecting an interrupt from this drive.
1596 * That means this could be:
1597 * (1) an interrupt from another PCI device
1598 * sharing the same PCI INT# as us.
1599 * or (2) a drive just entered sleep or standby mode,
1600 * and is interrupting to let us know.
1601 * or (3) a spurious interrupt of unknown origin.
1603 * For PCI, we cannot tell the difference,
1604 * so in that case we just ignore it and hope it goes away.
1606 * FIXME: unexpected_intr should be hwif-> then we can
1607 * remove all the ifdef PCI crap
1609 #ifdef CONFIG_BLK_DEV_IDEPCI
1610 if (hwif
->pci_dev
&& !hwif
->pci_dev
->vendor
)
1611 #endif /* CONFIG_BLK_DEV_IDEPCI */
1614 * Probably not a shared PCI interrupt,
1615 * so we can safely try to do something about it:
1617 unexpected_intr(irq
, hwgroup
);
1618 #ifdef CONFIG_BLK_DEV_IDEPCI
1621 * Whack the status register, just in case
1622 * we have a leftover pending IRQ.
1624 (void) hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1625 #endif /* CONFIG_BLK_DEV_IDEPCI */
1627 spin_unlock_irqrestore(&ide_lock
, flags
);
1630 drive
= hwgroup
->drive
;
1633 * This should NEVER happen, and there isn't much
1634 * we could do about it here.
1636 * [Note - this can occur if the drive is hot unplugged]
1638 spin_unlock_irqrestore(&ide_lock
, flags
);
1641 if (!drive_is_ready(drive
)) {
1643 * This happens regularly when we share a PCI IRQ with
1644 * another device. Unfortunately, it can also happen
1645 * with some buggy drives that trigger the IRQ before
1646 * their status register is up to date. Hopefully we have
1647 * enough advance overhead that the latter isn't a problem.
1649 spin_unlock_irqrestore(&ide_lock
, flags
);
1652 if (!hwgroup
->busy
) {
1653 hwgroup
->busy
= 1; /* paranoia */
1654 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1656 hwgroup
->handler
= NULL
;
1658 del_timer(&hwgroup
->timer
);
1659 spin_unlock(&ide_lock
);
1661 /* Some controllers might set DMA INTR no matter DMA or PIO;
1662 * bmdma status might need to be cleared even for
1663 * PIO interrupts to prevent spurious/lost irq.
1665 if (hwif
->ide_dma_clear_irq
&& !(drive
->waiting_for_dma
))
1666 /* ide_dma_end() needs bmdma status for error checking.
1667 * So, skip clearing bmdma status here and leave it
1668 * to ide_dma_end() if this is dma interrupt.
1670 hwif
->ide_dma_clear_irq(drive
);
1673 local_irq_enable_in_hardirq();
1674 /* service this interrupt, may set handler for next interrupt */
1675 startstop
= handler(drive
);
1676 spin_lock_irq(&ide_lock
);
1679 * Note that handler() may have set things up for another
1680 * interrupt to occur soon, but it cannot happen until
1681 * we exit from this routine, because it will be the
1682 * same irq as is currently being serviced here, and Linux
1683 * won't allow another of the same (on any CPU) until we return.
1685 drive
->service_time
= jiffies
- drive
->service_start
;
1686 if (startstop
== ide_stopped
) {
1687 if (hwgroup
->handler
== NULL
) { /* paranoia */
1689 ide_do_request(hwgroup
, hwif
->irq
);
1691 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1692 "on exit\n", drive
->name
);
1695 spin_unlock_irqrestore(&ide_lock
, flags
);
1700 * ide_init_drive_cmd - initialize a drive command request
1701 * @rq: request object
1703 * Initialize a request before we fill it in and send it down to
1704 * ide_do_drive_cmd. Commands must be set up by this function. Right
1705 * now it doesn't do a lot, but if that changes abusers will have a
1709 void ide_init_drive_cmd (struct request
*rq
)
1711 memset(rq
, 0, sizeof(*rq
));
1712 rq
->cmd_type
= REQ_TYPE_ATA_CMD
;
1716 EXPORT_SYMBOL(ide_init_drive_cmd
);
1719 * ide_do_drive_cmd - issue IDE special command
1720 * @drive: device to issue command
1721 * @rq: request to issue
1722 * @action: action for processing
1724 * This function issues a special IDE device request
1725 * onto the request queue.
1727 * If action is ide_wait, then the rq is queued at the end of the
1728 * request queue, and the function sleeps until it has been processed.
1729 * This is for use when invoked from an ioctl handler.
1731 * If action is ide_preempt, then the rq is queued at the head of
1732 * the request queue, displacing the currently-being-processed
1733 * request and this function returns immediately without waiting
1734 * for the new rq to be completed. This is VERY DANGEROUS, and is
1735 * intended for careful use by the ATAPI tape/cdrom driver code.
1737 * If action is ide_end, then the rq is queued at the end of the
1738 * request queue, and the function returns immediately without waiting
1739 * for the new rq to be completed. This is again intended for careful
1740 * use by the ATAPI tape/cdrom driver code.
1743 int ide_do_drive_cmd (ide_drive_t
*drive
, struct request
*rq
, ide_action_t action
)
1745 unsigned long flags
;
1746 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1747 DECLARE_COMPLETION_ONSTACK(wait
);
1748 int where
= ELEVATOR_INSERT_BACK
, err
;
1749 int must_wait
= (action
== ide_wait
|| action
== ide_head_wait
);
1754 * we need to hold an extra reference to request for safe inspection
1759 rq
->end_io_data
= &wait
;
1760 rq
->end_io
= blk_end_sync_rq
;
1763 spin_lock_irqsave(&ide_lock
, flags
);
1764 if (action
== ide_preempt
)
1766 if (action
== ide_preempt
|| action
== ide_head_wait
) {
1767 where
= ELEVATOR_INSERT_FRONT
;
1768 rq
->cmd_flags
|= REQ_PREEMPT
;
1770 __elv_add_request(drive
->queue
, rq
, where
, 0);
1771 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1772 spin_unlock_irqrestore(&ide_lock
, flags
);
1776 wait_for_completion(&wait
);
1780 blk_put_request(rq
);
1786 EXPORT_SYMBOL(ide_do_drive_cmd
);