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/config.h>
28 #include <linux/module.h>
29 #include <linux/types.h>
30 #include <linux/string.h>
31 #include <linux/kernel.h>
32 #include <linux/timer.h>
34 #include <linux/interrupt.h>
35 #include <linux/major.h>
36 #include <linux/errno.h>
37 #include <linux/genhd.h>
38 #include <linux/blkpg.h>
39 #include <linux/slab.h>
40 #include <linux/init.h>
41 #include <linux/pci.h>
42 #include <linux/delay.h>
43 #include <linux/ide.h>
44 #include <linux/completion.h>
45 #include <linux/reboot.h>
46 #include <linux/cdrom.h>
47 #include <linux/seq_file.h>
48 #include <linux/device.h>
49 #include <linux/kmod.h>
51 #include <asm/byteorder.h>
53 #include <asm/uaccess.h>
55 #include <asm/bitops.h>
57 static void ide_fill_flush_cmd(ide_drive_t
*drive
, struct request
*rq
)
62 * reuse cdb space for ata command
64 memset(buf
, 0, sizeof(rq
->cmd
));
66 rq
->flags
|= REQ_DRIVE_TASK
| REQ_STARTED
;
68 rq
->buffer
[0] = WIN_FLUSH_CACHE
;
70 if (ide_id_has_flush_cache_ext(drive
->id
) &&
71 (drive
->capacity64
>= (1UL << 28)))
72 rq
->buffer
[0] = WIN_FLUSH_CACHE_EXT
;
76 * preempt pending requests, and store this cache flush for immediate
79 static struct request
*ide_queue_flush_cmd(ide_drive_t
*drive
,
80 struct request
*rq
, int post
)
82 struct request
*flush_rq
= &HWGROUP(drive
)->wrq
;
85 * write cache disabled, clear the barrier bit and treat it like
89 rq
->flags
|= REQ_BAR_PREFLUSH
;
93 ide_init_drive_cmd(flush_rq
);
94 ide_fill_flush_cmd(drive
, flush_rq
);
96 flush_rq
->special
= rq
;
97 flush_rq
->nr_sectors
= rq
->nr_sectors
;
100 drive
->doing_barrier
= 1;
101 flush_rq
->flags
|= REQ_BAR_PREFLUSH
;
102 blkdev_dequeue_request(rq
);
104 flush_rq
->flags
|= REQ_BAR_POSTFLUSH
;
106 __elv_add_request(drive
->queue
, flush_rq
, ELEVATOR_INSERT_FRONT
, 0);
107 HWGROUP(drive
)->rq
= NULL
;
111 static int __ide_end_request(ide_drive_t
*drive
, struct request
*rq
,
112 int uptodate
, int nr_sectors
)
116 BUG_ON(!(rq
->flags
& REQ_STARTED
));
119 * if failfast is set on a request, override number of sectors and
120 * complete the whole request right now
122 if (blk_noretry_request(rq
) && end_io_error(uptodate
))
123 nr_sectors
= rq
->hard_nr_sectors
;
125 if (!blk_fs_request(rq
) && end_io_error(uptodate
) && !rq
->errors
)
129 * decide whether to reenable DMA -- 3 is a random magic for now,
130 * if we DMA timeout more than 3 times, just stay in PIO
132 if (drive
->state
== DMA_PIO_RETRY
&& drive
->retry_pio
<= 3) {
134 HWGROUP(drive
)->hwif
->ide_dma_on(drive
);
137 if (!end_that_request_first(rq
, uptodate
, nr_sectors
)) {
138 add_disk_randomness(rq
->rq_disk
);
140 if (blk_rq_tagged(rq
))
141 blk_queue_end_tag(drive
->queue
, rq
);
143 blkdev_dequeue_request(rq
);
144 HWGROUP(drive
)->rq
= NULL
;
145 end_that_request_last(rq
);
152 * ide_end_request - complete an IDE I/O
153 * @drive: IDE device for the I/O
155 * @nr_sectors: number of sectors completed
157 * This is our end_request wrapper function. We complete the I/O
158 * update random number input and dequeue the request, which if
159 * it was tagged may be out of order.
162 int ide_end_request (ide_drive_t
*drive
, int uptodate
, int nr_sectors
)
168 spin_lock_irqsave(&ide_lock
, flags
);
169 rq
= HWGROUP(drive
)->rq
;
172 nr_sectors
= rq
->hard_cur_sectors
;
174 if (!blk_barrier_rq(rq
) || !drive
->wcache
)
175 ret
= __ide_end_request(drive
, rq
, uptodate
, nr_sectors
);
177 struct request
*flush_rq
= &HWGROUP(drive
)->wrq
;
179 flush_rq
->nr_sectors
-= nr_sectors
;
180 if (!flush_rq
->nr_sectors
) {
181 ide_queue_flush_cmd(drive
, rq
, 1);
186 spin_unlock_irqrestore(&ide_lock
, flags
);
189 EXPORT_SYMBOL(ide_end_request
);
192 * ide_complete_pm_request - end the current Power Management request
193 * @drive: target drive
196 * This function cleans up the current PM request and stops the queue
199 static void ide_complete_pm_request (ide_drive_t
*drive
, struct request
*rq
)
204 printk("%s: completing PM request, %s\n", drive
->name
,
205 blk_pm_suspend_request(rq
) ? "suspend" : "resume");
207 spin_lock_irqsave(&ide_lock
, flags
);
208 if (blk_pm_suspend_request(rq
)) {
209 blk_stop_queue(drive
->queue
);
212 blk_start_queue(drive
->queue
);
214 blkdev_dequeue_request(rq
);
215 HWGROUP(drive
)->rq
= NULL
;
216 end_that_request_last(rq
);
217 spin_unlock_irqrestore(&ide_lock
, flags
);
221 * FIXME: probably move this somewhere else, name is bad too :)
223 u64
ide_get_error_location(ide_drive_t
*drive
, char *args
)
234 if (ide_id_has_flush_cache_ext(drive
->id
)) {
235 low
= (hcyl
<< 16) | (lcyl
<< 8) | sect
;
236 HWIF(drive
)->OUTB(drive
->ctl
|0x80, IDE_CONTROL_REG
);
237 high
= ide_read_24(drive
);
239 u8 cur
= HWIF(drive
)->INB(IDE_SELECT_REG
);
241 low
= (hcyl
<< 16) | (lcyl
<< 8) | sect
;
243 low
= hcyl
* drive
->head
* drive
->sect
;
244 low
+= lcyl
* drive
->sect
;
249 sector
= ((u64
) high
<< 24) | low
;
252 EXPORT_SYMBOL(ide_get_error_location
);
254 static void ide_complete_barrier(ide_drive_t
*drive
, struct request
*rq
,
257 struct request
*real_rq
= rq
->special
;
258 int good_sectors
, bad_sectors
;
262 if (blk_barrier_postflush(rq
)) {
264 * this completes the barrier write
266 __ide_end_request(drive
, real_rq
, 1, real_rq
->hard_nr_sectors
);
267 drive
->doing_barrier
= 0;
270 * just indicate that we did the pre flush
272 real_rq
->flags
|= REQ_BAR_PREFLUSH
;
273 elv_requeue_request(drive
->queue
, real_rq
);
276 * all is fine, return
282 * we need to end real_rq, but it's not on the queue currently.
283 * put it back on the queue, so we don't have to special case
284 * anything else for completing it
286 if (!blk_barrier_postflush(rq
))
287 elv_requeue_request(drive
->queue
, real_rq
);
290 * drive aborted flush command, assume FLUSH_CACHE_* doesn't
291 * work and disable barrier support
293 if (error
& ABRT_ERR
) {
294 printk(KERN_ERR
"%s: barrier support doesn't work\n", drive
->name
);
295 __ide_end_request(drive
, real_rq
, -EOPNOTSUPP
, real_rq
->hard_nr_sectors
);
296 blk_queue_ordered(drive
->queue
, 0);
297 blk_queue_issue_flush_fn(drive
->queue
, NULL
);
300 * find out what part of the request failed
303 if (blk_barrier_postflush(rq
)) {
304 sector
= ide_get_error_location(drive
, rq
->buffer
);
306 if ((sector
>= real_rq
->hard_sector
) &&
307 (sector
< real_rq
->hard_sector
+ real_rq
->hard_nr_sectors
))
308 good_sectors
= sector
- real_rq
->hard_sector
;
310 sector
= real_rq
->hard_sector
;
312 bad_sectors
= real_rq
->hard_nr_sectors
- good_sectors
;
314 __ide_end_request(drive
, real_rq
, 1, good_sectors
);
316 __ide_end_request(drive
, real_rq
, 0, bad_sectors
);
318 printk(KERN_ERR
"%s: failed barrier write: "
319 "sector=%Lx(good=%d/bad=%d)\n",
320 drive
->name
, (unsigned long long)sector
,
321 good_sectors
, bad_sectors
);
324 drive
->doing_barrier
= 0;
328 * ide_end_drive_cmd - end an explicit drive command
333 * Clean up after success/failure of an explicit drive command.
334 * These get thrown onto the queue so they are synchronized with
335 * real I/O operations on the drive.
337 * In LBA48 mode we have to read the register set twice to get
338 * all the extra information out.
341 void ide_end_drive_cmd (ide_drive_t
*drive
, u8 stat
, u8 err
)
343 ide_hwif_t
*hwif
= HWIF(drive
);
347 spin_lock_irqsave(&ide_lock
, flags
);
348 rq
= HWGROUP(drive
)->rq
;
349 spin_unlock_irqrestore(&ide_lock
, flags
);
351 if (rq
->flags
& REQ_DRIVE_CMD
) {
352 u8
*args
= (u8
*) rq
->buffer
;
354 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
359 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
361 } else if (rq
->flags
& REQ_DRIVE_TASK
) {
362 u8
*args
= (u8
*) rq
->buffer
;
364 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
369 args
[2] = hwif
->INB(IDE_NSECTOR_REG
);
370 args
[3] = hwif
->INB(IDE_SECTOR_REG
);
371 args
[4] = hwif
->INB(IDE_LCYL_REG
);
372 args
[5] = hwif
->INB(IDE_HCYL_REG
);
373 args
[6] = hwif
->INB(IDE_SELECT_REG
);
375 } else if (rq
->flags
& REQ_DRIVE_TASKFILE
) {
376 ide_task_t
*args
= (ide_task_t
*) rq
->special
;
378 rq
->errors
= !OK_STAT(stat
,READY_STAT
,BAD_STAT
);
381 if (args
->tf_in_flags
.b
.data
) {
382 u16 data
= hwif
->INW(IDE_DATA_REG
);
383 args
->tfRegister
[IDE_DATA_OFFSET
] = (data
) & 0xFF;
384 args
->hobRegister
[IDE_DATA_OFFSET
] = (data
>> 8) & 0xFF;
386 args
->tfRegister
[IDE_ERROR_OFFSET
] = err
;
387 /* be sure we're looking at the low order bits */
388 hwif
->OUTB(drive
->ctl
& ~0x80, IDE_CONTROL_REG
);
389 args
->tfRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
390 args
->tfRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
391 args
->tfRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
392 args
->tfRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
393 args
->tfRegister
[IDE_SELECT_OFFSET
] = hwif
->INB(IDE_SELECT_REG
);
394 args
->tfRegister
[IDE_STATUS_OFFSET
] = stat
;
396 if (drive
->addressing
== 1) {
397 hwif
->OUTB(drive
->ctl
|0x80, IDE_CONTROL_REG
);
398 args
->hobRegister
[IDE_FEATURE_OFFSET
] = hwif
->INB(IDE_FEATURE_REG
);
399 args
->hobRegister
[IDE_NSECTOR_OFFSET
] = hwif
->INB(IDE_NSECTOR_REG
);
400 args
->hobRegister
[IDE_SECTOR_OFFSET
] = hwif
->INB(IDE_SECTOR_REG
);
401 args
->hobRegister
[IDE_LCYL_OFFSET
] = hwif
->INB(IDE_LCYL_REG
);
402 args
->hobRegister
[IDE_HCYL_OFFSET
] = hwif
->INB(IDE_HCYL_REG
);
405 } else if (blk_pm_request(rq
)) {
407 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
408 drive
->name
, rq
->pm
->pm_step
, stat
, err
);
410 DRIVER(drive
)->complete_power_step(drive
, rq
, stat
, err
);
411 if (rq
->pm
->pm_step
== ide_pm_state_completed
)
412 ide_complete_pm_request(drive
, rq
);
416 spin_lock_irqsave(&ide_lock
, flags
);
417 blkdev_dequeue_request(rq
);
419 if (blk_barrier_preflush(rq
) || blk_barrier_postflush(rq
))
420 ide_complete_barrier(drive
, rq
, err
);
422 HWGROUP(drive
)->rq
= NULL
;
423 end_that_request_last(rq
);
424 spin_unlock_irqrestore(&ide_lock
, flags
);
427 EXPORT_SYMBOL(ide_end_drive_cmd
);
430 * try_to_flush_leftover_data - flush junk
431 * @drive: drive to flush
433 * try_to_flush_leftover_data() is invoked in response to a drive
434 * unexpectedly having its DRQ_STAT bit set. As an alternative to
435 * resetting the drive, this routine tries to clear the condition
436 * by read a sector's worth of data from the drive. Of course,
437 * this may not help if the drive is *waiting* for data from *us*.
439 void try_to_flush_leftover_data (ide_drive_t
*drive
)
441 int i
= (drive
->mult_count
? drive
->mult_count
: 1) * SECTOR_WORDS
;
443 if (drive
->media
!= ide_disk
)
447 u32 wcount
= (i
> 16) ? 16 : i
;
450 HWIF(drive
)->ata_input_data(drive
, buffer
, wcount
);
454 EXPORT_SYMBOL(try_to_flush_leftover_data
);
457 * FIXME Add an ATAPI error
461 * ide_error - handle an error on the IDE
462 * @drive: drive the error occurred on
463 * @msg: message to report
466 * ide_error() takes action based on the error returned by the drive.
467 * For normal I/O that may well include retries. We deal with
468 * both new-style (taskfile) and old style command handling here.
469 * In the case of taskfile command handling there is work left to
473 ide_startstop_t
ide_error (ide_drive_t
*drive
, const char *msg
, u8 stat
)
479 err
= ide_dump_status(drive
, msg
, stat
);
480 if (drive
== NULL
|| (rq
= HWGROUP(drive
)->rq
) == NULL
)
484 /* retry only "normal" I/O: */
485 if (rq
->flags
& (REQ_DRIVE_CMD
| REQ_DRIVE_TASK
)) {
487 ide_end_drive_cmd(drive
, stat
, err
);
490 if (rq
->flags
& REQ_DRIVE_TASKFILE
) {
492 ide_end_drive_cmd(drive
, stat
, err
);
496 if (stat
& BUSY_STAT
|| ((stat
& WRERR_STAT
) && !drive
->nowerr
)) {
497 /* other bits are useless when BUSY */
498 rq
->errors
|= ERROR_RESET
;
500 if (drive
->media
!= ide_disk
)
503 if (stat
& ERR_STAT
) {
504 /* err has different meaning on cdrom and tape */
505 if (err
== ABRT_ERR
) {
506 if (drive
->select
.b
.lba
&&
507 (hwif
->INB(IDE_COMMAND_REG
) == WIN_SPECIFY
))
508 /* some newer drives don't
509 * support WIN_SPECIFY
512 } else if ((err
& BAD_CRC
) == BAD_CRC
) {
514 /* UDMA crc error -- just retry the operation */
515 } else if (err
& (BBD_ERR
| ECC_ERR
)) {
516 /* retries won't help these */
517 rq
->errors
= ERROR_MAX
;
518 } else if (err
& TRK0_ERR
) {
519 /* help it find track zero */
520 rq
->errors
|= ERROR_RECAL
;
524 if ((stat
& DRQ_STAT
) && rq_data_dir(rq
) != WRITE
)
525 try_to_flush_leftover_data(drive
);
527 if (hwif
->INB(IDE_STATUS_REG
) & (BUSY_STAT
|DRQ_STAT
)) {
529 hwif
->OUTB(WIN_IDLEIMMEDIATE
,IDE_COMMAND_REG
);
531 if (rq
->errors
>= ERROR_MAX
) {
532 DRIVER(drive
)->end_request(drive
, 0, 0);
534 if ((rq
->errors
& ERROR_RESET
) == ERROR_RESET
) {
536 return ide_do_reset(drive
);
538 if ((rq
->errors
& ERROR_RECAL
) == ERROR_RECAL
)
539 drive
->special
.b
.recalibrate
= 1;
545 EXPORT_SYMBOL(ide_error
);
548 * ide_abort - abort pending IDE operatins
549 * @drive: drive the error occurred on
550 * @msg: message to report
552 * ide_abort kills and cleans up when we are about to do a
553 * host initiated reset on active commands. Longer term we
554 * want handlers to have sensible abort handling themselves
556 * This differs fundamentally from ide_error because in
557 * this case the command is doing just fine when we
561 ide_startstop_t
ide_abort(ide_drive_t
*drive
, const char *msg
)
566 if (drive
== NULL
|| (rq
= HWGROUP(drive
)->rq
) == NULL
)
570 /* retry only "normal" I/O: */
571 if (rq
->flags
& (REQ_DRIVE_CMD
| REQ_DRIVE_TASK
)) {
573 ide_end_drive_cmd(drive
, BUSY_STAT
, 0);
576 if (rq
->flags
& REQ_DRIVE_TASKFILE
) {
578 ide_end_drive_cmd(drive
, BUSY_STAT
, 0);
582 rq
->errors
|= ERROR_RESET
;
583 DRIVER(drive
)->end_request(drive
, 0, 0);
587 EXPORT_SYMBOL(ide_abort
);
590 * ide_cmd - issue a simple drive command
591 * @drive: drive the command is for
593 * @nsect: sector byte
594 * @handler: handler for the command completion
596 * Issue a simple drive command with interrupts.
597 * The drive must be selected beforehand.
600 void ide_cmd (ide_drive_t
*drive
, u8 cmd
, u8 nsect
, ide_handler_t
*handler
)
602 ide_hwif_t
*hwif
= HWIF(drive
);
604 hwif
->OUTB(drive
->ctl
,IDE_CONTROL_REG
); /* clear nIEN */
605 SELECT_MASK(drive
,0);
606 hwif
->OUTB(nsect
,IDE_NSECTOR_REG
);
607 ide_execute_command(drive
, cmd
, handler
, WAIT_CMD
, NULL
);
610 EXPORT_SYMBOL(ide_cmd
);
613 * drive_cmd_intr - drive command completion interrupt
614 * @drive: drive the completion interrupt occurred on
616 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
617 * We do any necessary daya reading and then wait for the drive to
618 * go non busy. At that point we may read the error data and complete
622 ide_startstop_t
drive_cmd_intr (ide_drive_t
*drive
)
624 struct request
*rq
= HWGROUP(drive
)->rq
;
625 ide_hwif_t
*hwif
= HWIF(drive
);
626 u8
*args
= (u8
*) rq
->buffer
;
627 u8 stat
= hwif
->INB(IDE_STATUS_REG
);
631 if ((stat
& DRQ_STAT
) && args
&& args
[3]) {
632 u8 io_32bit
= drive
->io_32bit
;
634 hwif
->ata_input_data(drive
, &args
[4], args
[3] * SECTOR_WORDS
);
635 drive
->io_32bit
= io_32bit
;
636 while (((stat
= hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) && retries
--)
640 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
) && DRIVER(drive
) != NULL
)
641 return DRIVER(drive
)->error(drive
, "drive_cmd", stat
);
642 /* calls ide_end_drive_cmd */
643 ide_end_drive_cmd(drive
, stat
, hwif
->INB(IDE_ERROR_REG
));
647 EXPORT_SYMBOL(drive_cmd_intr
);
650 * do_special - issue some special commands
651 * @drive: drive the command is for
653 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
654 * commands to a drive. It used to do much more, but has been scaled
658 ide_startstop_t
do_special (ide_drive_t
*drive
)
660 special_t
*s
= &drive
->special
;
663 printk("%s: do_special: 0x%02x\n", drive
->name
, s
->all
);
667 if (HWIF(drive
)->tuneproc
!= NULL
)
668 HWIF(drive
)->tuneproc(drive
, drive
->tune_req
);
672 return DRIVER(drive
)->special(drive
);
675 EXPORT_SYMBOL(do_special
);
678 * execute_drive_command - issue special drive command
679 * @drive: the drive to issue th command on
680 * @rq: the request structure holding the command
682 * execute_drive_cmd() issues a special drive command, usually
683 * initiated by ioctl() from the external hdparm program. The
684 * command can be a drive command, drive task or taskfile
685 * operation. Weirdly you can call it with NULL to wait for
686 * all commands to finish. Don't do this as that is due to change
689 ide_startstop_t
execute_drive_cmd (ide_drive_t
*drive
, struct request
*rq
)
691 ide_hwif_t
*hwif
= HWIF(drive
);
692 if (rq
->flags
& REQ_DRIVE_TASKFILE
) {
693 ide_task_t
*args
= rq
->special
;
698 hwif
->data_phase
= args
->data_phase
;
700 if (args
->tf_out_flags
.all
!= 0)
701 return flagged_taskfile(drive
, args
);
702 return do_rw_taskfile(drive
, args
);
703 } else if (rq
->flags
& REQ_DRIVE_TASK
) {
704 u8
*args
= rq
->buffer
;
710 printk("%s: DRIVE_TASK_CMD ", drive
->name
);
711 printk("cmd=0x%02x ", args
[0]);
712 printk("fr=0x%02x ", args
[1]);
713 printk("ns=0x%02x ", args
[2]);
714 printk("sc=0x%02x ", args
[3]);
715 printk("lcyl=0x%02x ", args
[4]);
716 printk("hcyl=0x%02x ", args
[5]);
717 printk("sel=0x%02x\n", args
[6]);
719 hwif
->OUTB(args
[1], IDE_FEATURE_REG
);
720 hwif
->OUTB(args
[3], IDE_SECTOR_REG
);
721 hwif
->OUTB(args
[4], IDE_LCYL_REG
);
722 hwif
->OUTB(args
[5], IDE_HCYL_REG
);
723 sel
= (args
[6] & ~0x10);
724 if (drive
->select
.b
.unit
)
726 hwif
->OUTB(sel
, IDE_SELECT_REG
);
727 ide_cmd(drive
, args
[0], args
[2], &drive_cmd_intr
);
729 } else if (rq
->flags
& REQ_DRIVE_CMD
) {
730 u8
*args
= rq
->buffer
;
735 printk("%s: DRIVE_CMD ", drive
->name
);
736 printk("cmd=0x%02x ", args
[0]);
737 printk("sc=0x%02x ", args
[1]);
738 printk("fr=0x%02x ", args
[2]);
739 printk("xx=0x%02x\n", args
[3]);
741 if (args
[0] == WIN_SMART
) {
742 hwif
->OUTB(0x4f, IDE_LCYL_REG
);
743 hwif
->OUTB(0xc2, IDE_HCYL_REG
);
744 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
745 hwif
->OUTB(args
[1],IDE_SECTOR_REG
);
746 ide_cmd(drive
, args
[0], args
[3], &drive_cmd_intr
);
749 hwif
->OUTB(args
[2],IDE_FEATURE_REG
);
750 ide_cmd(drive
, args
[0], args
[1], &drive_cmd_intr
);
756 * NULL is actually a valid way of waiting for
757 * all current requests to be flushed from the queue.
760 printk("%s: DRIVE_CMD (null)\n", drive
->name
);
762 ide_end_drive_cmd(drive
,
763 hwif
->INB(IDE_STATUS_REG
),
764 hwif
->INB(IDE_ERROR_REG
));
768 EXPORT_SYMBOL(execute_drive_cmd
);
771 * start_request - start of I/O and command issuing for IDE
773 * start_request() initiates handling of a new I/O request. It
774 * accepts commands and I/O (read/write) requests. It also does
775 * the final remapping for weird stuff like EZDrive. Once
776 * device mapper can work sector level the EZDrive stuff can go away
778 * FIXME: this function needs a rename
781 ide_startstop_t
start_request (ide_drive_t
*drive
, struct request
*rq
)
783 ide_startstop_t startstop
;
786 BUG_ON(!(rq
->flags
& REQ_STARTED
));
789 printk("%s: start_request: current=0x%08lx\n",
790 HWIF(drive
)->name
, (unsigned long) rq
);
793 /* bail early if we've exceeded max_failures */
794 if (drive
->max_failures
&& (drive
->failures
> drive
->max_failures
)) {
799 * bail early if we've sent a device to sleep, however how to wake
800 * this needs to be a masked flag. FIXME for proper operations.
802 if (drive
->suspend_reset
)
806 if (blk_fs_request(rq
) &&
807 (drive
->media
== ide_disk
|| drive
->media
== ide_floppy
)) {
808 block
+= drive
->sect0
;
810 /* Yecch - this will shift the entire interval,
811 possibly killing some innocent following sector */
812 if (block
== 0 && drive
->remap_0_to_1
== 1)
813 block
= 1; /* redirect MBR access to EZ-Drive partn table */
815 if (blk_pm_suspend_request(rq
) &&
816 rq
->pm
->pm_step
== ide_pm_state_start_suspend
)
817 /* Mark drive blocked when starting the suspend sequence. */
819 else if (blk_pm_resume_request(rq
) &&
820 rq
->pm
->pm_step
== ide_pm_state_start_resume
) {
822 * The first thing we do on wakeup is to wait for BSY bit to
823 * go away (with a looong timeout) as a drive on this hwif may
824 * just be POSTing itself.
825 * We do that before even selecting as the "other" device on
826 * the bus may be broken enough to walk on our toes at this
831 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive
->name
);
833 rc
= ide_wait_not_busy(HWIF(drive
), 35000);
835 printk(KERN_WARNING
"%s: bus not ready on wakeup\n", drive
->name
);
837 HWIF(drive
)->OUTB(8, HWIF(drive
)->io_ports
[IDE_CONTROL_OFFSET
]);
838 rc
= ide_wait_not_busy(HWIF(drive
), 10000);
840 printk(KERN_WARNING
"%s: drive not ready on wakeup\n", drive
->name
);
844 if (ide_wait_stat(&startstop
, drive
, drive
->ready_stat
, BUSY_STAT
|DRQ_STAT
, WAIT_READY
)) {
845 printk(KERN_ERR
"%s: drive not ready for command\n", drive
->name
);
848 if (!drive
->special
.all
) {
849 if (rq
->flags
& (REQ_DRIVE_CMD
| REQ_DRIVE_TASK
))
850 return execute_drive_cmd(drive
, rq
);
851 else if (rq
->flags
& REQ_DRIVE_TASKFILE
)
852 return execute_drive_cmd(drive
, rq
);
853 else if (blk_pm_request(rq
)) {
855 printk("%s: start_power_step(step: %d)\n",
856 drive
->name
, rq
->pm
->pm_step
);
858 startstop
= DRIVER(drive
)->start_power_step(drive
, rq
);
859 if (startstop
== ide_stopped
&&
860 rq
->pm
->pm_step
== ide_pm_state_completed
)
861 ide_complete_pm_request(drive
, rq
);
864 return (DRIVER(drive
)->do_request(drive
, rq
, block
));
866 return do_special(drive
);
868 DRIVER(drive
)->end_request(drive
, 0, 0);
872 EXPORT_SYMBOL(start_request
);
875 * ide_stall_queue - pause an IDE device
876 * @drive: drive to stall
877 * @timeout: time to stall for (jiffies)
879 * ide_stall_queue() can be used by a drive to give excess bandwidth back
880 * to the hwgroup by sleeping for timeout jiffies.
883 void ide_stall_queue (ide_drive_t
*drive
, unsigned long timeout
)
885 if (timeout
> WAIT_WORSTCASE
)
886 timeout
= WAIT_WORSTCASE
;
887 drive
->sleep
= timeout
+ jiffies
;
890 EXPORT_SYMBOL(ide_stall_queue
);
892 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
895 * choose_drive - select a drive to service
896 * @hwgroup: hardware group to select on
898 * choose_drive() selects the next drive which will be serviced.
899 * This is necessary because the IDE layer can't issue commands
900 * to both drives on the same cable, unlike SCSI.
903 static inline ide_drive_t
*choose_drive (ide_hwgroup_t
*hwgroup
)
905 ide_drive_t
*drive
, *best
;
909 drive
= hwgroup
->drive
;
912 * drive is doing pre-flush, ordered write, post-flush sequence. even
913 * though that is 3 requests, it must be seen as a single transaction.
914 * we must not preempt this drive until that is complete
916 if (drive
->doing_barrier
) {
918 * small race where queue could get replugged during
919 * the 3-request flush cycle, just yank the plug since
920 * we want it to finish asap
922 blk_remove_plug(drive
->queue
);
927 if ((!drive
->sleep
|| time_after_eq(jiffies
, drive
->sleep
))
928 && !elv_queue_empty(drive
->queue
)) {
930 || (drive
->sleep
&& (!best
->sleep
|| 0 < (signed long)(best
->sleep
- drive
->sleep
)))
931 || (!best
->sleep
&& 0 < (signed long)(WAKEUP(best
) - WAKEUP(drive
))))
933 if (!blk_queue_plugged(drive
->queue
))
937 } while ((drive
= drive
->next
) != hwgroup
->drive
);
938 if (best
&& best
->nice1
&& !best
->sleep
&& best
!= hwgroup
->drive
&& best
->service_time
> WAIT_MIN_SLEEP
) {
939 long t
= (signed long)(WAKEUP(best
) - jiffies
);
940 if (t
>= WAIT_MIN_SLEEP
) {
942 * We *may* have some time to spare, but first let's see if
943 * someone can potentially benefit from our nice mood today..
948 /* FIXME: use time_before */
949 && 0 < (signed long)(WAKEUP(drive
) - (jiffies
- best
->service_time
))
950 && 0 < (signed long)((jiffies
+ t
) - WAKEUP(drive
)))
952 ide_stall_queue(best
, min_t(long, t
, 10 * WAIT_MIN_SLEEP
));
955 } while ((drive
= drive
->next
) != best
);
962 * Issue a new request to a drive from hwgroup
963 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
965 * A hwgroup is a serialized group of IDE interfaces. Usually there is
966 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
967 * may have both interfaces in a single hwgroup to "serialize" access.
968 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
969 * together into one hwgroup for serialized access.
971 * Note also that several hwgroups can end up sharing a single IRQ,
972 * possibly along with many other devices. This is especially common in
973 * PCI-based systems with off-board IDE controller cards.
975 * The IDE driver uses the single global ide_lock spinlock to protect
976 * access to the request queues, and to protect the hwgroup->busy flag.
978 * The first thread into the driver for a particular hwgroup sets the
979 * hwgroup->busy flag to indicate that this hwgroup is now active,
980 * and then initiates processing of the top request from the request queue.
982 * Other threads attempting entry notice the busy setting, and will simply
983 * queue their new requests and exit immediately. Note that hwgroup->busy
984 * remains set even when the driver is merely awaiting the next interrupt.
985 * Thus, the meaning is "this hwgroup is busy processing a request".
987 * When processing of a request completes, the completing thread or IRQ-handler
988 * will start the next request from the queue. If no more work remains,
989 * the driver will clear the hwgroup->busy flag and exit.
991 * The ide_lock (spinlock) is used to protect all access to the
992 * hwgroup->busy flag, but is otherwise not needed for most processing in
993 * the driver. This makes the driver much more friendlier to shared IRQs
994 * than previous designs, while remaining 100% (?) SMP safe and capable.
996 /* --BenH: made non-static as ide-pmac.c uses it to kick the hwgroup back
997 * into life on wakeup from machine sleep.
999 void ide_do_request (ide_hwgroup_t
*hwgroup
, int masked_irq
)
1004 ide_startstop_t startstop
;
1006 /* for atari only: POSSIBLY BROKEN HERE(?) */
1007 ide_get_lock(ide_intr
, hwgroup
);
1009 /* caller must own ide_lock */
1010 BUG_ON(!irqs_disabled());
1012 while (!hwgroup
->busy
) {
1014 drive
= choose_drive(hwgroup
);
1015 if (drive
== NULL
) {
1016 unsigned long sleep
= 0;
1018 drive
= hwgroup
->drive
;
1020 if (drive
->sleep
&& (!sleep
|| 0 < (signed long)(sleep
- drive
->sleep
)))
1021 sleep
= drive
->sleep
;
1022 } while ((drive
= drive
->next
) != hwgroup
->drive
);
1025 * Take a short snooze, and then wake up this hwgroup again.
1026 * This gives other hwgroups on the same a chance to
1027 * play fairly with us, just in case there are big differences
1028 * in relative throughputs.. don't want to hog the cpu too much.
1030 if (time_before(sleep
, jiffies
+ WAIT_MIN_SLEEP
))
1031 sleep
= jiffies
+ WAIT_MIN_SLEEP
;
1033 if (timer_pending(&hwgroup
->timer
))
1034 printk(KERN_CRIT
"ide_set_handler: timer already active\n");
1036 /* so that ide_timer_expiry knows what to do */
1037 hwgroup
->sleeping
= 1;
1038 mod_timer(&hwgroup
->timer
, sleep
);
1039 /* we purposely leave hwgroup->busy==1
1042 /* Ugly, but how can we sleep for the lock
1043 * otherwise? perhaps from tq_disk?
1046 /* for atari only */
1051 /* no more work for this hwgroup (for now) */
1055 if (hwgroup
->hwif
->sharing_irq
&&
1056 hwif
!= hwgroup
->hwif
&&
1057 hwif
->io_ports
[IDE_CONTROL_OFFSET
]) {
1058 /* set nIEN for previous hwif */
1059 SELECT_INTERRUPT(drive
);
1061 hwgroup
->hwif
= hwif
;
1062 hwgroup
->drive
= drive
;
1064 drive
->service_start
= jiffies
;
1066 if (blk_queue_plugged(drive
->queue
)) {
1067 printk(KERN_ERR
"ide: huh? queue was plugged!\n");
1072 * we know that the queue isn't empty, but this can happen
1073 * if the q->prep_rq_fn() decides to kill a request
1075 rq
= elv_next_request(drive
->queue
);
1082 * if rq is a barrier write, issue pre cache flush if not
1085 if (blk_barrier_rq(rq
) && !blk_barrier_preflush(rq
))
1086 rq
= ide_queue_flush_cmd(drive
, rq
, 0);
1089 * Sanity: don't accept a request that isn't a PM request
1090 * if we are currently power managed. This is very important as
1091 * blk_stop_queue() doesn't prevent the elv_next_request()
1092 * above to return us whatever is in the queue. Since we call
1093 * ide_do_request() ourselves, we end up taking requests while
1094 * the queue is blocked...
1096 * We let requests forced at head of queue with ide-preempt
1097 * though. I hope that doesn't happen too much, hopefully not
1098 * unless the subdriver triggers such a thing in its own PM
1101 if (drive
->blocked
&& !blk_pm_request(rq
) && !(rq
->flags
& REQ_PREEMPT
)) {
1102 /* We clear busy, there should be no pending ATA command at this point. */
1110 * Some systems have trouble with IDE IRQs arriving while
1111 * the driver is still setting things up. So, here we disable
1112 * the IRQ used by this interface while the request is being started.
1113 * This may look bad at first, but pretty much the same thing
1114 * happens anyway when any interrupt comes in, IDE or otherwise
1115 * -- the kernel masks the IRQ while it is being handled.
1117 if (hwif
->irq
!= masked_irq
)
1118 disable_irq_nosync(hwif
->irq
);
1119 spin_unlock(&ide_lock
);
1121 /* allow other IRQs while we start this request */
1122 startstop
= start_request(drive
, rq
);
1123 spin_lock_irq(&ide_lock
);
1124 if (hwif
->irq
!= masked_irq
)
1125 enable_irq(hwif
->irq
);
1126 if (startstop
== ide_stopped
)
1131 EXPORT_SYMBOL(ide_do_request
);
1134 * Passes the stuff to ide_do_request
1136 void do_ide_request(request_queue_t
*q
)
1138 ide_drive_t
*drive
= q
->queuedata
;
1140 ide_do_request(HWGROUP(drive
), IDE_NO_IRQ
);
1144 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1145 * retry the current request in pio mode instead of risking tossing it
1148 static ide_startstop_t
ide_dma_timeout_retry(ide_drive_t
*drive
, int error
)
1150 ide_hwif_t
*hwif
= HWIF(drive
);
1152 ide_startstop_t ret
= ide_stopped
;
1155 * end current dma transaction
1159 printk(KERN_WARNING
"%s: DMA timeout error\n", drive
->name
);
1160 (void)HWIF(drive
)->ide_dma_end(drive
);
1161 ret
= DRIVER(drive
)->error(drive
, "dma timeout error",
1162 hwif
->INB(IDE_STATUS_REG
));
1164 printk(KERN_WARNING
"%s: DMA timeout retry\n", drive
->name
);
1165 (void) hwif
->ide_dma_timeout(drive
);
1169 * disable dma for now, but remember that we did so because of
1170 * a timeout -- we'll reenable after we finish this next request
1171 * (or rather the first chunk of it) in pio.
1174 drive
->state
= DMA_PIO_RETRY
;
1175 (void) hwif
->ide_dma_off_quietly(drive
);
1178 * un-busy drive etc (hwgroup->busy is cleared on return) and
1179 * make sure request is sane
1181 rq
= HWGROUP(drive
)->rq
;
1182 HWGROUP(drive
)->rq
= NULL
;
1185 rq
->sector
= rq
->bio
->bi_sector
;
1186 rq
->current_nr_sectors
= bio_iovec(rq
->bio
)->bv_len
>> 9;
1187 rq
->hard_cur_sectors
= rq
->current_nr_sectors
;
1195 * ide_timer_expiry - handle lack of an IDE interrupt
1196 * @data: timer callback magic (hwgroup)
1198 * An IDE command has timed out before the expected drive return
1199 * occurred. At this point we attempt to clean up the current
1200 * mess. If the current handler includes an expiry handler then
1201 * we invoke the expiry handler, and providing it is happy the
1202 * work is done. If that fails we apply generic recovery rules
1203 * invoking the handler and checking the drive DMA status. We
1204 * have an excessively incestuous relationship with the DMA
1205 * logic that wants cleaning up.
1208 void ide_timer_expiry (unsigned long data
)
1210 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*) data
;
1211 ide_handler_t
*handler
;
1212 ide_expiry_t
*expiry
;
1213 unsigned long flags
;
1214 unsigned long wait
= -1;
1216 spin_lock_irqsave(&ide_lock
, flags
);
1218 if ((handler
= hwgroup
->handler
) == NULL
) {
1220 * Either a marginal timeout occurred
1221 * (got the interrupt just as timer expired),
1222 * or we were "sleeping" to give other devices a chance.
1223 * Either way, we don't really want to complain about anything.
1225 if (hwgroup
->sleeping
) {
1226 hwgroup
->sleeping
= 0;
1230 ide_drive_t
*drive
= hwgroup
->drive
;
1232 printk(KERN_ERR
"ide_timer_expiry: hwgroup->drive was NULL\n");
1233 hwgroup
->handler
= NULL
;
1236 ide_startstop_t startstop
= ide_stopped
;
1237 if (!hwgroup
->busy
) {
1238 hwgroup
->busy
= 1; /* paranoia */
1239 printk(KERN_ERR
"%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive
->name
);
1241 if ((expiry
= hwgroup
->expiry
) != NULL
) {
1243 if ((wait
= expiry(drive
)) > 0) {
1245 hwgroup
->timer
.expires
= jiffies
+ wait
;
1246 add_timer(&hwgroup
->timer
);
1247 spin_unlock_irqrestore(&ide_lock
, flags
);
1251 hwgroup
->handler
= NULL
;
1253 * We need to simulate a real interrupt when invoking
1254 * the handler() function, which means we need to
1255 * globally mask the specific IRQ:
1257 spin_unlock(&ide_lock
);
1259 #if DISABLE_IRQ_NOSYNC
1260 disable_irq_nosync(hwif
->irq
);
1262 /* disable_irq_nosync ?? */
1263 disable_irq(hwif
->irq
);
1264 #endif /* DISABLE_IRQ_NOSYNC */
1266 * as if we were handling an interrupt */
1267 local_irq_disable();
1268 if (hwgroup
->poll_timeout
!= 0) {
1269 startstop
= handler(drive
);
1270 } else if (drive_is_ready(drive
)) {
1271 if (drive
->waiting_for_dma
)
1272 (void) hwgroup
->hwif
->ide_dma_lostirq(drive
);
1273 (void)ide_ack_intr(hwif
);
1274 printk(KERN_WARNING
"%s: lost interrupt\n", drive
->name
);
1275 startstop
= handler(drive
);
1277 if (drive
->waiting_for_dma
) {
1278 startstop
= ide_dma_timeout_retry(drive
, wait
);
1281 DRIVER(drive
)->error(drive
, "irq timeout", hwif
->INB(IDE_STATUS_REG
));
1283 drive
->service_time
= jiffies
- drive
->service_start
;
1284 spin_lock_irq(&ide_lock
);
1285 enable_irq(hwif
->irq
);
1286 if (startstop
== ide_stopped
)
1290 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1291 spin_unlock_irqrestore(&ide_lock
, flags
);
1294 EXPORT_SYMBOL(ide_timer_expiry
);
1297 * unexpected_intr - handle an unexpected IDE interrupt
1298 * @irq: interrupt line
1299 * @hwgroup: hwgroup being processed
1301 * There's nothing really useful we can do with an unexpected interrupt,
1302 * other than reading the status register (to clear it), and logging it.
1303 * There should be no way that an irq can happen before we're ready for it,
1304 * so we needn't worry much about losing an "important" interrupt here.
1306 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1307 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1308 * looks "good", we just ignore the interrupt completely.
1310 * This routine assumes __cli() is in effect when called.
1312 * If an unexpected interrupt happens on irq15 while we are handling irq14
1313 * and if the two interfaces are "serialized" (CMD640), then it looks like
1314 * we could screw up by interfering with a new request being set up for
1317 * In reality, this is a non-issue. The new command is not sent unless
1318 * the drive is ready to accept one, in which case we know the drive is
1319 * not trying to interrupt us. And ide_set_handler() is always invoked
1320 * before completing the issuance of any new drive command, so we will not
1321 * be accidentally invoked as a result of any valid command completion
1324 * Note that we must walk the entire hwgroup here. We know which hwif
1325 * is doing the current command, but we don't know which hwif burped
1329 static void unexpected_intr (int irq
, ide_hwgroup_t
*hwgroup
)
1332 ide_hwif_t
*hwif
= hwgroup
->hwif
;
1335 * handle the unexpected interrupt
1338 if (hwif
->irq
== irq
) {
1339 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1340 if (!OK_STAT(stat
, READY_STAT
, BAD_STAT
)) {
1341 /* Try to not flood the console with msgs */
1342 static unsigned long last_msgtime
, count
;
1344 if (time_after(jiffies
, last_msgtime
+ HZ
)) {
1345 last_msgtime
= jiffies
;
1346 printk(KERN_ERR
"%s%s: unexpected interrupt, "
1347 "status=0x%02x, count=%ld\n",
1349 (hwif
->next
==hwgroup
->hwif
) ? "" : "(?)", stat
, count
);
1353 } while ((hwif
= hwif
->next
) != hwgroup
->hwif
);
1357 * ide_intr - default IDE interrupt handler
1358 * @irq: interrupt number
1359 * @dev_id: hwif group
1360 * @regs: unused weirdness from the kernel irq layer
1362 * This is the default IRQ handler for the IDE layer. You should
1363 * not need to override it. If you do be aware it is subtle in
1366 * hwgroup->hwif is the interface in the group currently performing
1367 * a command. hwgroup->drive is the drive and hwgroup->handler is
1368 * the IRQ handler to call. As we issue a command the handlers
1369 * step through multiple states, reassigning the handler to the
1370 * next step in the process. Unlike a smart SCSI controller IDE
1371 * expects the main processor to sequence the various transfer
1372 * stages. We also manage a poll timer to catch up with most
1373 * timeout situations. There are still a few where the handlers
1374 * don't ever decide to give up.
1376 * The handler eventually returns ide_stopped to indicate the
1377 * request completed. At this point we issue the next request
1378 * on the hwgroup and the process begins again.
1381 irqreturn_t
ide_intr (int irq
, void *dev_id
, struct pt_regs
*regs
)
1383 unsigned long flags
;
1384 ide_hwgroup_t
*hwgroup
= (ide_hwgroup_t
*)dev_id
;
1387 ide_handler_t
*handler
;
1388 ide_startstop_t startstop
;
1390 spin_lock_irqsave(&ide_lock
, flags
);
1391 hwif
= hwgroup
->hwif
;
1393 if (!ide_ack_intr(hwif
)) {
1394 spin_unlock_irqrestore(&ide_lock
, flags
);
1398 if ((handler
= hwgroup
->handler
) == NULL
||
1399 hwgroup
->poll_timeout
!= 0) {
1401 * Not expecting an interrupt from this drive.
1402 * That means this could be:
1403 * (1) an interrupt from another PCI device
1404 * sharing the same PCI INT# as us.
1405 * or (2) a drive just entered sleep or standby mode,
1406 * and is interrupting to let us know.
1407 * or (3) a spurious interrupt of unknown origin.
1409 * For PCI, we cannot tell the difference,
1410 * so in that case we just ignore it and hope it goes away.
1412 * FIXME: unexpected_intr should be hwif-> then we can
1413 * remove all the ifdef PCI crap
1415 #ifdef CONFIG_BLK_DEV_IDEPCI
1416 if (hwif
->pci_dev
&& !hwif
->pci_dev
->vendor
)
1417 #endif /* CONFIG_BLK_DEV_IDEPCI */
1420 * Probably not a shared PCI interrupt,
1421 * so we can safely try to do something about it:
1423 unexpected_intr(irq
, hwgroup
);
1424 #ifdef CONFIG_BLK_DEV_IDEPCI
1427 * Whack the status register, just in case
1428 * we have a leftover pending IRQ.
1430 (void) hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
1431 #endif /* CONFIG_BLK_DEV_IDEPCI */
1433 spin_unlock_irqrestore(&ide_lock
, flags
);
1436 drive
= hwgroup
->drive
;
1439 * This should NEVER happen, and there isn't much
1440 * we could do about it here.
1442 * [Note - this can occur if the drive is hot unplugged]
1444 spin_unlock_irqrestore(&ide_lock
, flags
);
1447 if (!drive_is_ready(drive
)) {
1449 * This happens regularly when we share a PCI IRQ with
1450 * another device. Unfortunately, it can also happen
1451 * with some buggy drives that trigger the IRQ before
1452 * their status register is up to date. Hopefully we have
1453 * enough advance overhead that the latter isn't a problem.
1455 spin_unlock_irqrestore(&ide_lock
, flags
);
1458 if (!hwgroup
->busy
) {
1459 hwgroup
->busy
= 1; /* paranoia */
1460 printk(KERN_ERR
"%s: ide_intr: hwgroup->busy was 0 ??\n", drive
->name
);
1462 hwgroup
->handler
= NULL
;
1463 del_timer(&hwgroup
->timer
);
1464 spin_unlock(&ide_lock
);
1468 /* service this interrupt, may set handler for next interrupt */
1469 startstop
= handler(drive
);
1470 spin_lock_irq(&ide_lock
);
1473 * Note that handler() may have set things up for another
1474 * interrupt to occur soon, but it cannot happen until
1475 * we exit from this routine, because it will be the
1476 * same irq as is currently being serviced here, and Linux
1477 * won't allow another of the same (on any CPU) until we return.
1479 drive
->service_time
= jiffies
- drive
->service_start
;
1480 if (startstop
== ide_stopped
) {
1481 if (hwgroup
->handler
== NULL
) { /* paranoia */
1483 ide_do_request(hwgroup
, hwif
->irq
);
1485 printk(KERN_ERR
"%s: ide_intr: huh? expected NULL handler "
1486 "on exit\n", drive
->name
);
1489 spin_unlock_irqrestore(&ide_lock
, flags
);
1493 EXPORT_SYMBOL(ide_intr
);
1496 * ide_init_drive_cmd - initialize a drive command request
1497 * @rq: request object
1499 * Initialize a request before we fill it in and send it down to
1500 * ide_do_drive_cmd. Commands must be set up by this function. Right
1501 * now it doesn't do a lot, but if that changes abusers will have a
1505 void ide_init_drive_cmd (struct request
*rq
)
1507 memset(rq
, 0, sizeof(*rq
));
1508 rq
->flags
= REQ_DRIVE_CMD
;
1512 EXPORT_SYMBOL(ide_init_drive_cmd
);
1515 * ide_do_drive_cmd - issue IDE special command
1516 * @drive: device to issue command
1517 * @rq: request to issue
1518 * @action: action for processing
1520 * This function issues a special IDE device request
1521 * onto the request queue.
1523 * If action is ide_wait, then the rq is queued at the end of the
1524 * request queue, and the function sleeps until it has been processed.
1525 * This is for use when invoked from an ioctl handler.
1527 * If action is ide_preempt, then the rq is queued at the head of
1528 * the request queue, displacing the currently-being-processed
1529 * request and this function returns immediately without waiting
1530 * for the new rq to be completed. This is VERY DANGEROUS, and is
1531 * intended for careful use by the ATAPI tape/cdrom driver code.
1533 * If action is ide_next, then the rq is queued immediately after
1534 * the currently-being-processed-request (if any), and the function
1535 * returns without waiting for the new rq to be completed. As above,
1536 * This is VERY DANGEROUS, and is intended for careful use by the
1537 * ATAPI tape/cdrom driver code.
1539 * If action is ide_end, then the rq is queued at the end of the
1540 * request queue, and the function returns immediately without waiting
1541 * for the new rq to be completed. This is again intended for careful
1542 * use by the ATAPI tape/cdrom driver code.
1545 int ide_do_drive_cmd (ide_drive_t
*drive
, struct request
*rq
, ide_action_t action
)
1547 unsigned long flags
;
1548 ide_hwgroup_t
*hwgroup
= HWGROUP(drive
);
1549 DECLARE_COMPLETION(wait
);
1550 int where
= ELEVATOR_INSERT_BACK
, err
;
1551 int must_wait
= (action
== ide_wait
|| action
== ide_head_wait
);
1553 #ifdef CONFIG_BLK_DEV_PDC4030
1555 * FIXME: there should be a drive or hwif->special
1556 * handler that points here by default, not hacks
1557 * in the ide-io.c code
1559 * FIXME2: That code breaks power management if used with
1560 * this chipset, that really doesn't belong here !
1562 if (HWIF(drive
)->chipset
== ide_pdc4030
&& rq
->buffer
!= NULL
)
1563 return -ENOSYS
; /* special drive cmds not supported */
1566 rq
->rq_status
= RQ_ACTIVE
;
1568 rq
->rq_disk
= drive
->disk
;
1571 * we need to hold an extra reference to request for safe inspection
1576 rq
->waiting
= &wait
;
1579 spin_lock_irqsave(&ide_lock
, flags
);
1580 if (action
== ide_preempt
)
1582 if (action
== ide_preempt
|| action
== ide_head_wait
) {
1583 where
= ELEVATOR_INSERT_FRONT
;
1584 rq
->flags
|= REQ_PREEMPT
;
1586 __elv_add_request(drive
->queue
, rq
, where
, 0);
1587 ide_do_request(hwgroup
, IDE_NO_IRQ
);
1588 spin_unlock_irqrestore(&ide_lock
, flags
);
1592 wait_for_completion(&wait
);
1597 blk_put_request(rq
);
1603 EXPORT_SYMBOL(ide_do_drive_cmd
);