4 * Basic PIO and command management functionality.
6 * This code was split off from ide.c. See ide.c for history and original
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2, or (at your option) any
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * For the avoidance of doubt the "preferred form" of this code is one which
20 * is in an open non patent encumbered format. Where cryptographic key signing
21 * forms part of the process of creating an executable the information
22 * including keys needed to generate an equivalently functional executable
23 * are deemed to be part of the source code.
27 #include <linux/module.h>
28 #include <linux/types.h>
29 #include <linux/string.h>
30 #include <linux/kernel.h>
31 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/major.h>
35 #include <linux/errno.h>
36 #include <linux/genhd.h>
37 #include <linux/blkpg.h>
38 #include <linux/slab.h>
39 #include <linux/init.h>
40 #include <linux/pci.h>
41 #include <linux/delay.h>
42 #include <linux/ide.h>
43 #include <linux/completion.h>
44 #include <linux/reboot.h>
45 #include <linux/cdrom.h>
46 #include <linux/seq_file.h>
47 #include <linux/device.h>
48 #include <linux/kmod.h>
49 #include <linux/scatterlist.h>
50 #include <linux/bitops.h>
52 #include <asm/byteorder.h>
54 #include <asm/uaccess.h>
57 static int __ide_end_request(ide_drive_t *drive, struct request *rq,
58 int uptodate, unsigned int nr_bytes, int dequeue)
63 * if failfast is set on a request, override number of sectors and
64 * complete the whole request right now
66 if (blk_noretry_request(rq) && end_io_error(uptodate))
67 nr_bytes = rq->hard_nr_sectors << 9;
69 if (!blk_fs_request(rq) && end_io_error(uptodate) && !rq->errors)
73 * decide whether to reenable DMA -- 3 is a random magic for now,
74 * if we DMA timeout more than 3 times, just stay in PIO
76 if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) {
78 HWGROUP(drive)->hwif->ide_dma_on(drive);
81 if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
82 add_disk_randomness(rq->rq_disk);
84 if (!list_empty(&rq->queuelist))
85 blkdev_dequeue_request(rq);
86 HWGROUP(drive)->rq = NULL;
88 end_that_request_last(rq, uptodate);
96 * ide_end_request - complete an IDE I/O
97 * @drive: IDE device for the I/O
99 * @nr_sectors: number of sectors completed
101 * This is our end_request wrapper function. We complete the I/O
102 * update random number input and dequeue the request, which if
103 * it was tagged may be out of order.
106 int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
108 unsigned int nr_bytes = nr_sectors << 9;
114 * room for locking improvements here, the calls below don't
115 * need the queue lock held at all
117 spin_lock_irqsave(&ide_lock, flags);
118 rq = HWGROUP(drive)->rq;
121 if (blk_pc_request(rq))
122 nr_bytes = rq->data_len;
124 nr_bytes = rq->hard_cur_sectors << 9;
127 ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1);
129 spin_unlock_irqrestore(&ide_lock, flags);
132 EXPORT_SYMBOL(ide_end_request);
135 * Power Management state machine. This one is rather trivial for now,
136 * we should probably add more, like switching back to PIO on suspend
137 * to help some BIOSes, re-do the door locking on resume, etc...
141 ide_pm_flush_cache = ide_pm_state_start_suspend,
144 idedisk_pm_restore_pio = ide_pm_state_start_resume,
149 static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error)
151 struct request_pm_state *pm = rq->data;
153 if (drive->media != ide_disk)
156 switch (pm->pm_step) {
157 case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */
158 if (pm->pm_state == PM_EVENT_FREEZE)
159 pm->pm_step = ide_pm_state_completed;
161 pm->pm_step = idedisk_pm_standby;
163 case idedisk_pm_standby: /* Suspend step 2 (standby) complete */
164 pm->pm_step = ide_pm_state_completed;
166 case idedisk_pm_restore_pio: /* Resume step 1 complete */
167 pm->pm_step = idedisk_pm_idle;
169 case idedisk_pm_idle: /* Resume step 2 (idle) complete */
170 pm->pm_step = ide_pm_restore_dma;
175 static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
177 struct request_pm_state *pm = rq->data;
178 ide_task_t *args = rq->special;
180 memset(args, 0, sizeof(*args));
182 switch (pm->pm_step) {
183 case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */
184 if (drive->media != ide_disk)
186 /* Not supported? Switch to next step now. */
187 if (!drive->wcache || !ide_id_has_flush_cache(drive->id)) {
188 ide_complete_power_step(drive, rq, 0, 0);
191 if (ide_id_has_flush_cache_ext(drive->id))
192 args->tf.command = WIN_FLUSH_CACHE_EXT;
194 args->tf.command = WIN_FLUSH_CACHE;
197 case idedisk_pm_standby: /* Suspend step 2 (standby) */
198 args->tf.command = WIN_STANDBYNOW1;
201 case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */
202 ide_set_max_pio(drive);
204 * skip idedisk_pm_idle for ATAPI devices
206 if (drive->media != ide_disk)
207 pm->pm_step = ide_pm_restore_dma;
209 ide_complete_power_step(drive, rq, 0, 0);
212 case idedisk_pm_idle: /* Resume step 2 (idle) */
213 args->tf.command = WIN_IDLEIMMEDIATE;
216 case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */
218 * Right now, all we do is call ide_set_dma(drive),
219 * we could be smarter and check for current xfer_speed
220 * in struct drive etc...
222 if (drive->hwif->ide_dma_on == NULL)
224 drive->hwif->dma_off_quietly(drive);
226 * TODO: respect ->using_dma setting
231 pm->pm_step = ide_pm_state_completed;
235 args->tf_flags = IDE_TFLAG_OUT_TF;
236 if (drive->addressing == 1)
237 args->tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_OUT_HOB);
238 args->command_type = IDE_DRIVE_TASK_NO_DATA;
239 args->handler = task_no_data_intr;
240 return do_rw_taskfile(drive, args);
244 * ide_end_dequeued_request - complete an IDE I/O
245 * @drive: IDE device for the I/O
247 * @nr_sectors: number of sectors completed
249 * Complete an I/O that is no longer on the request queue. This
250 * typically occurs when we pull the request and issue a REQUEST_SENSE.
251 * We must still finish the old request but we must not tamper with the
252 * queue in the meantime.
254 * NOTE: This path does not handle barrier, but barrier is not supported
258 int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq,
259 int uptodate, int nr_sectors)
264 spin_lock_irqsave(&ide_lock, flags);
265 BUG_ON(!blk_rq_started(rq));
266 ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0);
267 spin_unlock_irqrestore(&ide_lock, flags);
271 EXPORT_SYMBOL_GPL(ide_end_dequeued_request);
275 * ide_complete_pm_request - end the current Power Management request
276 * @drive: target drive
279 * This function cleans up the current PM request and stops the queue
282 static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq)
287 printk("%s: completing PM request, %s\n", drive->name,
288 blk_pm_suspend_request(rq) ? "suspend" : "resume");
290 spin_lock_irqsave(&ide_lock, flags);
291 if (blk_pm_suspend_request(rq)) {
292 blk_stop_queue(drive->queue);
295 blk_start_queue(drive->queue);
297 blkdev_dequeue_request(rq);
298 HWGROUP(drive)->rq = NULL;
299 end_that_request_last(rq, 1);
300 spin_unlock_irqrestore(&ide_lock, flags);
304 * ide_end_drive_cmd - end an explicit drive command
309 * Clean up after success/failure of an explicit drive command.
310 * These get thrown onto the queue so they are synchronized with
311 * real I/O operations on the drive.
313 * In LBA48 mode we have to read the register set twice to get
314 * all the extra information out.
317 void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
319 ide_hwif_t *hwif = HWIF(drive);
323 spin_lock_irqsave(&ide_lock, flags);
324 rq = HWGROUP(drive)->rq;
325 spin_unlock_irqrestore(&ide_lock, flags);
327 if (rq->cmd_type == REQ_TYPE_ATA_CMD) {
328 u8 *args = (u8 *) rq->buffer;
330 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
335 args[2] = hwif->INB(IDE_NSECTOR_REG);
337 } else if (rq->cmd_type == REQ_TYPE_ATA_TASK) {
338 u8 *args = (u8 *) rq->buffer;
340 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
345 /* be sure we're looking at the low order bits */
346 hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG);
347 args[2] = hwif->INB(IDE_NSECTOR_REG);
348 args[3] = hwif->INB(IDE_SECTOR_REG);
349 args[4] = hwif->INB(IDE_LCYL_REG);
350 args[5] = hwif->INB(IDE_HCYL_REG);
351 args[6] = hwif->INB(IDE_SELECT_REG);
353 } else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
354 ide_task_t *args = (ide_task_t *) rq->special;
356 rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
359 struct ide_taskfile *tf = &args->tf;
361 if (args->tf_in_flags.b.data) {
362 u16 data = hwif->INW(IDE_DATA_REG);
364 tf->data = data & 0xff;
365 tf->hob_data = (data >> 8) & 0xff;
368 /* be sure we're looking at the low order bits */
369 hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG);
370 tf->nsect = hwif->INB(IDE_NSECTOR_REG);
371 tf->lbal = hwif->INB(IDE_SECTOR_REG);
372 tf->lbam = hwif->INB(IDE_LCYL_REG);
373 tf->lbah = hwif->INB(IDE_HCYL_REG);
374 tf->device = hwif->INB(IDE_SELECT_REG);
377 if (drive->addressing == 1) {
378 hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
379 tf->hob_feature = hwif->INB(IDE_FEATURE_REG);
380 tf->hob_nsect = hwif->INB(IDE_NSECTOR_REG);
381 tf->hob_lbal = hwif->INB(IDE_SECTOR_REG);
382 tf->hob_lbam = hwif->INB(IDE_LCYL_REG);
383 tf->hob_lbah = hwif->INB(IDE_HCYL_REG);
386 } else if (blk_pm_request(rq)) {
387 struct request_pm_state *pm = rq->data;
389 printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
390 drive->name, rq->pm->pm_step, stat, err);
392 ide_complete_power_step(drive, rq, stat, err);
393 if (pm->pm_step == ide_pm_state_completed)
394 ide_complete_pm_request(drive, rq);
398 spin_lock_irqsave(&ide_lock, flags);
399 blkdev_dequeue_request(rq);
400 HWGROUP(drive)->rq = NULL;
402 end_that_request_last(rq, !rq->errors);
403 spin_unlock_irqrestore(&ide_lock, flags);
406 EXPORT_SYMBOL(ide_end_drive_cmd);
409 * try_to_flush_leftover_data - flush junk
410 * @drive: drive to flush
412 * try_to_flush_leftover_data() is invoked in response to a drive
413 * unexpectedly having its DRQ_STAT bit set. As an alternative to
414 * resetting the drive, this routine tries to clear the condition
415 * by read a sector's worth of data from the drive. Of course,
416 * this may not help if the drive is *waiting* for data from *us*.
418 static void try_to_flush_leftover_data (ide_drive_t *drive)
420 int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
422 if (drive->media != ide_disk)
426 u32 wcount = (i > 16) ? 16 : i;
429 HWIF(drive)->ata_input_data(drive, buffer, wcount);
433 static void ide_kill_rq(ide_drive_t *drive, struct request *rq)
438 drv = *(ide_driver_t **)rq->rq_disk->private_data;
439 drv->end_request(drive, 0, 0);
441 ide_end_request(drive, 0, 0);
444 static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
446 ide_hwif_t *hwif = drive->hwif;
448 if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
449 /* other bits are useless when BUSY */
450 rq->errors |= ERROR_RESET;
451 } else if (stat & ERR_STAT) {
452 /* err has different meaning on cdrom and tape */
453 if (err == ABRT_ERR) {
454 if (drive->select.b.lba &&
455 /* some newer drives don't support WIN_SPECIFY */
456 hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY)
458 } else if ((err & BAD_CRC) == BAD_CRC) {
459 /* UDMA crc error, just retry the operation */
461 } else if (err & (BBD_ERR | ECC_ERR)) {
462 /* retries won't help these */
463 rq->errors = ERROR_MAX;
464 } else if (err & TRK0_ERR) {
465 /* help it find track zero */
466 rq->errors |= ERROR_RECAL;
470 if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ &&
471 (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0)
472 try_to_flush_leftover_data(drive);
474 if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) {
475 ide_kill_rq(drive, rq);
479 if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
480 rq->errors |= ERROR_RESET;
482 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
484 return ide_do_reset(drive);
487 if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
488 drive->special.b.recalibrate = 1;
495 static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
497 ide_hwif_t *hwif = drive->hwif;
499 if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
500 /* other bits are useless when BUSY */
501 rq->errors |= ERROR_RESET;
503 /* add decoding error stuff */
506 if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
508 hwif->OUTB(WIN_IDLEIMMEDIATE, IDE_COMMAND_REG);
510 if (rq->errors >= ERROR_MAX) {
511 ide_kill_rq(drive, rq);
513 if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
515 return ide_do_reset(drive);
524 __ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
526 if (drive->media == ide_disk)
527 return ide_ata_error(drive, rq, stat, err);
528 return ide_atapi_error(drive, rq, stat, err);
531 EXPORT_SYMBOL_GPL(__ide_error);
534 * ide_error - handle an error on the IDE
535 * @drive: drive the error occurred on
536 * @msg: message to report
539 * ide_error() takes action based on the error returned by the drive.
540 * For normal I/O that may well include retries. We deal with
541 * both new-style (taskfile) and old style command handling here.
542 * In the case of taskfile command handling there is work left to
546 ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat)
551 err = ide_dump_status(drive, msg, stat);
553 if ((rq = HWGROUP(drive)->rq) == NULL)
556 /* retry only "normal" I/O: */
557 if (!blk_fs_request(rq)) {
559 ide_end_drive_cmd(drive, stat, err);
566 drv = *(ide_driver_t **)rq->rq_disk->private_data;
567 return drv->error(drive, rq, stat, err);
569 return __ide_error(drive, rq, stat, err);
572 EXPORT_SYMBOL_GPL(ide_error);
574 ide_startstop_t __ide_abort(ide_drive_t *drive, struct request *rq)
576 if (drive->media != ide_disk)
577 rq->errors |= ERROR_RESET;
579 ide_kill_rq(drive, rq);
584 EXPORT_SYMBOL_GPL(__ide_abort);
587 * ide_abort - abort pending IDE operations
588 * @drive: drive the error occurred on
589 * @msg: message to report
591 * ide_abort kills and cleans up when we are about to do a
592 * host initiated reset on active commands. Longer term we
593 * want handlers to have sensible abort handling themselves
595 * This differs fundamentally from ide_error because in
596 * this case the command is doing just fine when we
600 ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg)
604 if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
607 /* retry only "normal" I/O: */
608 if (!blk_fs_request(rq)) {
610 ide_end_drive_cmd(drive, BUSY_STAT, 0);
617 drv = *(ide_driver_t **)rq->rq_disk->private_data;
618 return drv->abort(drive, rq);
620 return __ide_abort(drive, rq);
624 * ide_cmd - issue a simple drive command
625 * @drive: drive the command is for
627 * @handler: handler for the command completion
629 * Issue a simple drive command with interrupts.
630 * The drive must be selected beforehand.
633 static void ide_cmd(ide_drive_t *drive, u8 cmd, ide_handler_t *handler)
635 ide_hwif_t *hwif = HWIF(drive);
637 hwif->OUTB(drive->ctl,IDE_CONTROL_REG); /* clear nIEN */
638 SELECT_MASK(drive,0);
639 ide_execute_command(drive, cmd, handler, WAIT_CMD, NULL);
643 * drive_cmd_intr - drive command completion interrupt
644 * @drive: drive the completion interrupt occurred on
646 * drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
647 * We do any necessary data reading and then wait for the drive to
648 * go non busy. At that point we may read the error data and complete
652 static ide_startstop_t drive_cmd_intr (ide_drive_t *drive)
654 struct request *rq = HWGROUP(drive)->rq;
655 ide_hwif_t *hwif = HWIF(drive);
656 u8 *args = (u8 *) rq->buffer;
657 u8 stat = hwif->INB(IDE_STATUS_REG);
660 local_irq_enable_in_hardirq();
661 if (rq->cmd_type == REQ_TYPE_ATA_CMD &&
662 (stat & DRQ_STAT) && args && args[3]) {
663 u8 io_32bit = drive->io_32bit;
665 hwif->ata_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
666 drive->io_32bit = io_32bit;
667 while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
671 if (!OK_STAT(stat, READY_STAT, BAD_STAT))
672 return ide_error(drive, "drive_cmd", stat);
673 /* calls ide_end_drive_cmd */
674 ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
678 static void ide_init_specify_cmd(ide_drive_t *drive, ide_task_t *task)
680 task->tf.nsect = drive->sect;
681 task->tf.lbal = drive->sect;
682 task->tf.lbam = drive->cyl;
683 task->tf.lbah = drive->cyl >> 8;
684 task->tf.device = ((drive->head - 1) | drive->select.all) & ~ATA_LBA;
685 task->tf.command = WIN_SPECIFY;
687 task->handler = &set_geometry_intr;
690 static void ide_init_restore_cmd(ide_drive_t *drive, ide_task_t *task)
692 task->tf.nsect = drive->sect;
693 task->tf.command = WIN_RESTORE;
695 task->handler = &recal_intr;
698 static void ide_init_setmult_cmd(ide_drive_t *drive, ide_task_t *task)
700 task->tf.nsect = drive->mult_req;
701 task->tf.command = WIN_SETMULT;
703 task->handler = &set_multmode_intr;
706 static ide_startstop_t ide_disk_special(ide_drive_t *drive)
708 special_t *s = &drive->special;
711 memset(&args, 0, sizeof(ide_task_t));
712 args.command_type = IDE_DRIVE_TASK_NO_DATA;
714 if (s->b.set_geometry) {
715 s->b.set_geometry = 0;
716 ide_init_specify_cmd(drive, &args);
717 } else if (s->b.recalibrate) {
718 s->b.recalibrate = 0;
719 ide_init_restore_cmd(drive, &args);
720 } else if (s->b.set_multmode) {
721 s->b.set_multmode = 0;
722 if (drive->mult_req > drive->id->max_multsect)
723 drive->mult_req = drive->id->max_multsect;
724 ide_init_setmult_cmd(drive, &args);
726 int special = s->all;
728 printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
732 args.tf_flags = IDE_TFLAG_OUT_TF;
733 if (drive->addressing == 1)
734 args.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_OUT_HOB);
736 do_rw_taskfile(drive, &args);
742 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
744 static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
753 return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
756 return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
759 return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
766 * do_special - issue some special commands
767 * @drive: drive the command is for
769 * do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
770 * commands to a drive. It used to do much more, but has been scaled
774 static ide_startstop_t do_special (ide_drive_t *drive)
776 special_t *s = &drive->special;
779 printk("%s: do_special: 0x%02x\n", drive->name, s->all);
782 ide_hwif_t *hwif = drive->hwif;
783 u8 req_pio = drive->tune_req;
787 if (set_pio_mode_abuse(drive->hwif, req_pio)) {
789 if (hwif->set_pio_mode == NULL)
793 * take ide_lock for drive->[no_]unmask/[no_]io_32bit
795 if (req_pio == 8 || req_pio == 9) {
798 spin_lock_irqsave(&ide_lock, flags);
799 hwif->set_pio_mode(drive, req_pio);
800 spin_unlock_irqrestore(&ide_lock, flags);
802 hwif->set_pio_mode(drive, req_pio);
804 int keep_dma = drive->using_dma;
806 ide_set_pio(drive, req_pio);
808 if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
810 hwif->ide_dma_on(drive);
816 if (drive->media == ide_disk)
817 return ide_disk_special(drive);
825 void ide_map_sg(ide_drive_t *drive, struct request *rq)
827 ide_hwif_t *hwif = drive->hwif;
828 struct scatterlist *sg = hwif->sg_table;
830 if (hwif->sg_mapped) /* needed by ide-scsi */
833 if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) {
834 hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
836 sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
841 EXPORT_SYMBOL_GPL(ide_map_sg);
843 void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq)
845 ide_hwif_t *hwif = drive->hwif;
847 hwif->nsect = hwif->nleft = rq->nr_sectors;
852 EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
855 * execute_drive_command - issue special drive command
856 * @drive: the drive to issue the command on
857 * @rq: the request structure holding the command
859 * execute_drive_cmd() issues a special drive command, usually
860 * initiated by ioctl() from the external hdparm program. The
861 * command can be a drive command, drive task or taskfile
862 * operation. Weirdly you can call it with NULL to wait for
863 * all commands to finish. Don't do this as that is due to change
866 static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
869 ide_hwif_t *hwif = HWIF(drive);
870 u8 *args = rq->buffer;
872 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
873 ide_task_t *task = rq->special;
878 hwif->data_phase = task->data_phase;
880 switch (hwif->data_phase) {
881 case TASKFILE_MULTI_OUT:
883 case TASKFILE_MULTI_IN:
885 ide_init_sg_cmd(drive, rq);
886 ide_map_sg(drive, rq);
891 if (task->tf_flags & IDE_TFLAG_FLAGGED)
892 return flagged_taskfile(drive, task);
894 task->tf_flags |= IDE_TFLAG_OUT_TF;
895 if (drive->addressing == 1)
896 task->tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_OUT_HOB);
898 return do_rw_taskfile(drive, task);
904 if (rq->cmd_type == REQ_TYPE_ATA_TASK) {
906 printk("%s: DRIVE_TASK_CMD ", drive->name);
907 printk("cmd=0x%02x ", args[0]);
908 printk("fr=0x%02x ", args[1]);
909 printk("ns=0x%02x ", args[2]);
910 printk("sc=0x%02x ", args[3]);
911 printk("lcyl=0x%02x ", args[4]);
912 printk("hcyl=0x%02x ", args[5]);
913 printk("sel=0x%02x\n", args[6]);
915 hwif->OUTB(args[1], IDE_FEATURE_REG);
916 hwif->OUTB(args[2], IDE_NSECTOR_REG);
917 hwif->OUTB(args[3], IDE_SECTOR_REG);
918 hwif->OUTB(args[4], IDE_LCYL_REG);
919 hwif->OUTB(args[5], IDE_HCYL_REG);
920 hwif->OUTB((args[6] & 0xEF)|drive->select.all, IDE_SELECT_REG);
921 } else { /* rq->cmd_type == REQ_TYPE_ATA_CMD */
923 printk("%s: DRIVE_CMD ", drive->name);
924 printk("cmd=0x%02x ", args[0]);
925 printk("sc=0x%02x ", args[1]);
926 printk("fr=0x%02x ", args[2]);
927 printk("xx=0x%02x\n", args[3]);
929 hwif->OUTB(args[2], IDE_FEATURE_REG);
930 if (args[0] == WIN_SMART) {
931 hwif->OUTB(args[3],IDE_NSECTOR_REG);
932 hwif->OUTB(args[1],IDE_SECTOR_REG);
933 hwif->OUTB(0x4f, IDE_LCYL_REG);
934 hwif->OUTB(0xc2, IDE_HCYL_REG);
936 hwif->OUTB(args[1], IDE_NSECTOR_REG);
939 ide_cmd(drive, args[0], &drive_cmd_intr);
944 * NULL is actually a valid way of waiting for
945 * all current requests to be flushed from the queue.
948 printk("%s: DRIVE_CMD (null)\n", drive->name);
950 ide_end_drive_cmd(drive,
951 hwif->INB(IDE_STATUS_REG),
952 hwif->INB(IDE_ERROR_REG));
956 static void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
958 struct request_pm_state *pm = rq->data;
960 if (blk_pm_suspend_request(rq) &&
961 pm->pm_step == ide_pm_state_start_suspend)
962 /* Mark drive blocked when starting the suspend sequence. */
964 else if (blk_pm_resume_request(rq) &&
965 pm->pm_step == ide_pm_state_start_resume) {
967 * The first thing we do on wakeup is to wait for BSY bit to
968 * go away (with a looong timeout) as a drive on this hwif may
969 * just be POSTing itself.
970 * We do that before even selecting as the "other" device on
971 * the bus may be broken enough to walk on our toes at this
976 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
978 rc = ide_wait_not_busy(HWIF(drive), 35000);
980 printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
983 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
984 rc = ide_wait_not_busy(HWIF(drive), 100000);
986 printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
991 * start_request - start of I/O and command issuing for IDE
993 * start_request() initiates handling of a new I/O request. It
994 * accepts commands and I/O (read/write) requests. It also does
995 * the final remapping for weird stuff like EZDrive. Once
996 * device mapper can work sector level the EZDrive stuff can go away
998 * FIXME: this function needs a rename
1001 static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
1003 ide_startstop_t startstop;
1006 BUG_ON(!blk_rq_started(rq));
1009 printk("%s: start_request: current=0x%08lx\n",
1010 HWIF(drive)->name, (unsigned long) rq);
1013 /* bail early if we've exceeded max_failures */
1014 if (drive->max_failures && (drive->failures > drive->max_failures)) {
1015 rq->cmd_flags |= REQ_FAILED;
1020 if (blk_fs_request(rq) &&
1021 (drive->media == ide_disk || drive->media == ide_floppy)) {
1022 block += drive->sect0;
1024 /* Yecch - this will shift the entire interval,
1025 possibly killing some innocent following sector */
1026 if (block == 0 && drive->remap_0_to_1 == 1)
1027 block = 1; /* redirect MBR access to EZ-Drive partn table */
1029 if (blk_pm_request(rq))
1030 ide_check_pm_state(drive, rq);
1032 SELECT_DRIVE(drive);
1033 if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
1034 printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
1037 if (!drive->special.all) {
1041 * We reset the drive so we need to issue a SETFEATURES.
1042 * Do it _after_ do_special() restored device parameters.
1044 if (drive->current_speed == 0xff)
1045 ide_config_drive_speed(drive, drive->desired_speed);
1047 if (rq->cmd_type == REQ_TYPE_ATA_CMD ||
1048 rq->cmd_type == REQ_TYPE_ATA_TASK ||
1049 rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
1050 return execute_drive_cmd(drive, rq);
1051 else if (blk_pm_request(rq)) {
1052 struct request_pm_state *pm = rq->data;
1054 printk("%s: start_power_step(step: %d)\n",
1055 drive->name, rq->pm->pm_step);
1057 startstop = ide_start_power_step(drive, rq);
1058 if (startstop == ide_stopped &&
1059 pm->pm_step == ide_pm_state_completed)
1060 ide_complete_pm_request(drive, rq);
1064 drv = *(ide_driver_t **)rq->rq_disk->private_data;
1065 return drv->do_request(drive, rq, block);
1067 return do_special(drive);
1069 ide_kill_rq(drive, rq);
1074 * ide_stall_queue - pause an IDE device
1075 * @drive: drive to stall
1076 * @timeout: time to stall for (jiffies)
1078 * ide_stall_queue() can be used by a drive to give excess bandwidth back
1079 * to the hwgroup by sleeping for timeout jiffies.
1082 void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
1084 if (timeout > WAIT_WORSTCASE)
1085 timeout = WAIT_WORSTCASE;
1086 drive->sleep = timeout + jiffies;
1087 drive->sleeping = 1;
1090 EXPORT_SYMBOL(ide_stall_queue);
1092 #define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
1095 * choose_drive - select a drive to service
1096 * @hwgroup: hardware group to select on
1098 * choose_drive() selects the next drive which will be serviced.
1099 * This is necessary because the IDE layer can't issue commands
1100 * to both drives on the same cable, unlike SCSI.
1103 static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup)
1105 ide_drive_t *drive, *best;
1109 drive = hwgroup->drive;
1112 * drive is doing pre-flush, ordered write, post-flush sequence. even
1113 * though that is 3 requests, it must be seen as a single transaction.
1114 * we must not preempt this drive until that is complete
1116 if (blk_queue_flushing(drive->queue)) {
1118 * small race where queue could get replugged during
1119 * the 3-request flush cycle, just yank the plug since
1120 * we want it to finish asap
1122 blk_remove_plug(drive->queue);
1127 if ((!drive->sleeping || time_after_eq(jiffies, drive->sleep))
1128 && !elv_queue_empty(drive->queue)) {
1130 || (drive->sleeping && (!best->sleeping || time_before(drive->sleep, best->sleep)))
1131 || (!best->sleeping && time_before(WAKEUP(drive), WAKEUP(best))))
1133 if (!blk_queue_plugged(drive->queue))
1137 } while ((drive = drive->next) != hwgroup->drive);
1138 if (best && best->nice1 && !best->sleeping && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) {
1139 long t = (signed long)(WAKEUP(best) - jiffies);
1140 if (t >= WAIT_MIN_SLEEP) {
1142 * We *may* have some time to spare, but first let's see if
1143 * someone can potentially benefit from our nice mood today..
1147 if (!drive->sleeping
1148 && time_before(jiffies - best->service_time, WAKEUP(drive))
1149 && time_before(WAKEUP(drive), jiffies + t))
1151 ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP));
1154 } while ((drive = drive->next) != best);
1161 * Issue a new request to a drive from hwgroup
1162 * Caller must have already done spin_lock_irqsave(&ide_lock, ..);
1164 * A hwgroup is a serialized group of IDE interfaces. Usually there is
1165 * exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
1166 * may have both interfaces in a single hwgroup to "serialize" access.
1167 * Or possibly multiple ISA interfaces can share a common IRQ by being grouped
1168 * together into one hwgroup for serialized access.
1170 * Note also that several hwgroups can end up sharing a single IRQ,
1171 * possibly along with many other devices. This is especially common in
1172 * PCI-based systems with off-board IDE controller cards.
1174 * The IDE driver uses the single global ide_lock spinlock to protect
1175 * access to the request queues, and to protect the hwgroup->busy flag.
1177 * The first thread into the driver for a particular hwgroup sets the
1178 * hwgroup->busy flag to indicate that this hwgroup is now active,
1179 * and then initiates processing of the top request from the request queue.
1181 * Other threads attempting entry notice the busy setting, and will simply
1182 * queue their new requests and exit immediately. Note that hwgroup->busy
1183 * remains set even when the driver is merely awaiting the next interrupt.
1184 * Thus, the meaning is "this hwgroup is busy processing a request".
1186 * When processing of a request completes, the completing thread or IRQ-handler
1187 * will start the next request from the queue. If no more work remains,
1188 * the driver will clear the hwgroup->busy flag and exit.
1190 * The ide_lock (spinlock) is used to protect all access to the
1191 * hwgroup->busy flag, but is otherwise not needed for most processing in
1192 * the driver. This makes the driver much more friendlier to shared IRQs
1193 * than previous designs, while remaining 100% (?) SMP safe and capable.
1195 static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
1200 ide_startstop_t startstop;
1203 /* for atari only: POSSIBLY BROKEN HERE(?) */
1204 ide_get_lock(ide_intr, hwgroup);
1206 /* caller must own ide_lock */
1207 BUG_ON(!irqs_disabled());
1209 while (!hwgroup->busy) {
1211 drive = choose_drive(hwgroup);
1212 if (drive == NULL) {
1214 unsigned long sleep = 0; /* shut up, gcc */
1216 drive = hwgroup->drive;
1218 if (drive->sleeping && (!sleeping || time_before(drive->sleep, sleep))) {
1220 sleep = drive->sleep;
1222 } while ((drive = drive->next) != hwgroup->drive);
1225 * Take a short snooze, and then wake up this hwgroup again.
1226 * This gives other hwgroups on the same a chance to
1227 * play fairly with us, just in case there are big differences
1228 * in relative throughputs.. don't want to hog the cpu too much.
1230 if (time_before(sleep, jiffies + WAIT_MIN_SLEEP))
1231 sleep = jiffies + WAIT_MIN_SLEEP;
1233 if (timer_pending(&hwgroup->timer))
1234 printk(KERN_CRIT "ide_set_handler: timer already active\n");
1236 /* so that ide_timer_expiry knows what to do */
1237 hwgroup->sleeping = 1;
1238 hwgroup->req_gen_timer = hwgroup->req_gen;
1239 mod_timer(&hwgroup->timer, sleep);
1240 /* we purposely leave hwgroup->busy==1
1243 /* Ugly, but how can we sleep for the lock
1244 * otherwise? perhaps from tq_disk?
1247 /* for atari only */
1252 /* no more work for this hwgroup (for now) */
1257 if (hwgroup->hwif->sharing_irq &&
1258 hwif != hwgroup->hwif &&
1259 hwif->io_ports[IDE_CONTROL_OFFSET]) {
1260 /* set nIEN for previous hwif */
1261 SELECT_INTERRUPT(drive);
1263 hwgroup->hwif = hwif;
1264 hwgroup->drive = drive;
1265 drive->sleeping = 0;
1266 drive->service_start = jiffies;
1268 if (blk_queue_plugged(drive->queue)) {
1269 printk(KERN_ERR "ide: huh? queue was plugged!\n");
1274 * we know that the queue isn't empty, but this can happen
1275 * if the q->prep_rq_fn() decides to kill a request
1277 rq = elv_next_request(drive->queue);
1284 * Sanity: don't accept a request that isn't a PM request
1285 * if we are currently power managed. This is very important as
1286 * blk_stop_queue() doesn't prevent the elv_next_request()
1287 * above to return us whatever is in the queue. Since we call
1288 * ide_do_request() ourselves, we end up taking requests while
1289 * the queue is blocked...
1291 * We let requests forced at head of queue with ide-preempt
1292 * though. I hope that doesn't happen too much, hopefully not
1293 * unless the subdriver triggers such a thing in its own PM
1296 * We count how many times we loop here to make sure we service
1297 * all drives in the hwgroup without looping for ever
1299 if (drive->blocked && !blk_pm_request(rq) && !(rq->cmd_flags & REQ_PREEMPT)) {
1300 drive = drive->next ? drive->next : hwgroup->drive;
1301 if (loops++ < 4 && !blk_queue_plugged(drive->queue))
1303 /* We clear busy, there should be no pending ATA command at this point. */
1311 * Some systems have trouble with IDE IRQs arriving while
1312 * the driver is still setting things up. So, here we disable
1313 * the IRQ used by this interface while the request is being started.
1314 * This may look bad at first, but pretty much the same thing
1315 * happens anyway when any interrupt comes in, IDE or otherwise
1316 * -- the kernel masks the IRQ while it is being handled.
1318 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
1319 disable_irq_nosync(hwif->irq);
1320 spin_unlock(&ide_lock);
1321 local_irq_enable_in_hardirq();
1322 /* allow other IRQs while we start this request */
1323 startstop = start_request(drive, rq);
1324 spin_lock_irq(&ide_lock);
1325 if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
1326 enable_irq(hwif->irq);
1327 if (startstop == ide_stopped)
1333 * Passes the stuff to ide_do_request
1335 void do_ide_request(struct request_queue *q)
1337 ide_drive_t *drive = q->queuedata;
1339 ide_do_request(HWGROUP(drive), IDE_NO_IRQ);
1343 * un-busy the hwgroup etc, and clear any pending DMA status. we want to
1344 * retry the current request in pio mode instead of risking tossing it
1347 static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
1349 ide_hwif_t *hwif = HWIF(drive);
1351 ide_startstop_t ret = ide_stopped;
1354 * end current dma transaction
1358 printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
1359 (void)HWIF(drive)->ide_dma_end(drive);
1360 ret = ide_error(drive, "dma timeout error",
1361 hwif->INB(IDE_STATUS_REG));
1363 printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
1364 hwif->dma_timeout(drive);
1368 * disable dma for now, but remember that we did so because of
1369 * a timeout -- we'll reenable after we finish this next request
1370 * (or rather the first chunk of it) in pio.
1373 drive->state = DMA_PIO_RETRY;
1374 hwif->dma_off_quietly(drive);
1377 * un-busy drive etc (hwgroup->busy is cleared on return) and
1378 * make sure request is sane
1380 rq = HWGROUP(drive)->rq;
1385 HWGROUP(drive)->rq = NULL;
1392 rq->sector = rq->bio->bi_sector;
1393 rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9;
1394 rq->hard_cur_sectors = rq->current_nr_sectors;
1395 rq->buffer = bio_data(rq->bio);
1401 * ide_timer_expiry - handle lack of an IDE interrupt
1402 * @data: timer callback magic (hwgroup)
1404 * An IDE command has timed out before the expected drive return
1405 * occurred. At this point we attempt to clean up the current
1406 * mess. If the current handler includes an expiry handler then
1407 * we invoke the expiry handler, and providing it is happy the
1408 * work is done. If that fails we apply generic recovery rules
1409 * invoking the handler and checking the drive DMA status. We
1410 * have an excessively incestuous relationship with the DMA
1411 * logic that wants cleaning up.
1414 void ide_timer_expiry (unsigned long data)
1416 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
1417 ide_handler_t *handler;
1418 ide_expiry_t *expiry;
1419 unsigned long flags;
1420 unsigned long wait = -1;
1422 spin_lock_irqsave(&ide_lock, flags);
1424 if (((handler = hwgroup->handler) == NULL) ||
1425 (hwgroup->req_gen != hwgroup->req_gen_timer)) {
1427 * Either a marginal timeout occurred
1428 * (got the interrupt just as timer expired),
1429 * or we were "sleeping" to give other devices a chance.
1430 * Either way, we don't really want to complain about anything.
1432 if (hwgroup->sleeping) {
1433 hwgroup->sleeping = 0;
1437 ide_drive_t *drive = hwgroup->drive;
1439 printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n");
1440 hwgroup->handler = NULL;
1443 ide_startstop_t startstop = ide_stopped;
1444 if (!hwgroup->busy) {
1445 hwgroup->busy = 1; /* paranoia */
1446 printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name);
1448 if ((expiry = hwgroup->expiry) != NULL) {
1450 if ((wait = expiry(drive)) > 0) {
1452 hwgroup->timer.expires = jiffies + wait;
1453 hwgroup->req_gen_timer = hwgroup->req_gen;
1454 add_timer(&hwgroup->timer);
1455 spin_unlock_irqrestore(&ide_lock, flags);
1459 hwgroup->handler = NULL;
1461 * We need to simulate a real interrupt when invoking
1462 * the handler() function, which means we need to
1463 * globally mask the specific IRQ:
1465 spin_unlock(&ide_lock);
1467 /* disable_irq_nosync ?? */
1468 disable_irq(hwif->irq);
1470 * as if we were handling an interrupt */
1471 local_irq_disable();
1472 if (hwgroup->polling) {
1473 startstop = handler(drive);
1474 } else if (drive_is_ready(drive)) {
1475 if (drive->waiting_for_dma)
1476 hwgroup->hwif->dma_lost_irq(drive);
1477 (void)ide_ack_intr(hwif);
1478 printk(KERN_WARNING "%s: lost interrupt\n", drive->name);
1479 startstop = handler(drive);
1481 if (drive->waiting_for_dma) {
1482 startstop = ide_dma_timeout_retry(drive, wait);
1485 ide_error(drive, "irq timeout", hwif->INB(IDE_STATUS_REG));
1487 drive->service_time = jiffies - drive->service_start;
1488 spin_lock_irq(&ide_lock);
1489 enable_irq(hwif->irq);
1490 if (startstop == ide_stopped)
1494 ide_do_request(hwgroup, IDE_NO_IRQ);
1495 spin_unlock_irqrestore(&ide_lock, flags);
1499 * unexpected_intr - handle an unexpected IDE interrupt
1500 * @irq: interrupt line
1501 * @hwgroup: hwgroup being processed
1503 * There's nothing really useful we can do with an unexpected interrupt,
1504 * other than reading the status register (to clear it), and logging it.
1505 * There should be no way that an irq can happen before we're ready for it,
1506 * so we needn't worry much about losing an "important" interrupt here.
1508 * On laptops (and "green" PCs), an unexpected interrupt occurs whenever
1509 * the drive enters "idle", "standby", or "sleep" mode, so if the status
1510 * looks "good", we just ignore the interrupt completely.
1512 * This routine assumes __cli() is in effect when called.
1514 * If an unexpected interrupt happens on irq15 while we are handling irq14
1515 * and if the two interfaces are "serialized" (CMD640), then it looks like
1516 * we could screw up by interfering with a new request being set up for
1519 * In reality, this is a non-issue. The new command is not sent unless
1520 * the drive is ready to accept one, in which case we know the drive is
1521 * not trying to interrupt us. And ide_set_handler() is always invoked
1522 * before completing the issuance of any new drive command, so we will not
1523 * be accidentally invoked as a result of any valid command completion
1526 * Note that we must walk the entire hwgroup here. We know which hwif
1527 * is doing the current command, but we don't know which hwif burped
1531 static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
1534 ide_hwif_t *hwif = hwgroup->hwif;
1537 * handle the unexpected interrupt
1540 if (hwif->irq == irq) {
1541 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1542 if (!OK_STAT(stat, READY_STAT, BAD_STAT)) {
1543 /* Try to not flood the console with msgs */
1544 static unsigned long last_msgtime, count;
1546 if (time_after(jiffies, last_msgtime + HZ)) {
1547 last_msgtime = jiffies;
1548 printk(KERN_ERR "%s%s: unexpected interrupt, "
1549 "status=0x%02x, count=%ld\n",
1551 (hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count);
1555 } while ((hwif = hwif->next) != hwgroup->hwif);
1559 * ide_intr - default IDE interrupt handler
1560 * @irq: interrupt number
1561 * @dev_id: hwif group
1562 * @regs: unused weirdness from the kernel irq layer
1564 * This is the default IRQ handler for the IDE layer. You should
1565 * not need to override it. If you do be aware it is subtle in
1568 * hwgroup->hwif is the interface in the group currently performing
1569 * a command. hwgroup->drive is the drive and hwgroup->handler is
1570 * the IRQ handler to call. As we issue a command the handlers
1571 * step through multiple states, reassigning the handler to the
1572 * next step in the process. Unlike a smart SCSI controller IDE
1573 * expects the main processor to sequence the various transfer
1574 * stages. We also manage a poll timer to catch up with most
1575 * timeout situations. There are still a few where the handlers
1576 * don't ever decide to give up.
1578 * The handler eventually returns ide_stopped to indicate the
1579 * request completed. At this point we issue the next request
1580 * on the hwgroup and the process begins again.
1583 irqreturn_t ide_intr (int irq, void *dev_id)
1585 unsigned long flags;
1586 ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
1589 ide_handler_t *handler;
1590 ide_startstop_t startstop;
1592 spin_lock_irqsave(&ide_lock, flags);
1593 hwif = hwgroup->hwif;
1595 if (!ide_ack_intr(hwif)) {
1596 spin_unlock_irqrestore(&ide_lock, flags);
1600 if ((handler = hwgroup->handler) == NULL || hwgroup->polling) {
1602 * Not expecting an interrupt from this drive.
1603 * That means this could be:
1604 * (1) an interrupt from another PCI device
1605 * sharing the same PCI INT# as us.
1606 * or (2) a drive just entered sleep or standby mode,
1607 * and is interrupting to let us know.
1608 * or (3) a spurious interrupt of unknown origin.
1610 * For PCI, we cannot tell the difference,
1611 * so in that case we just ignore it and hope it goes away.
1613 * FIXME: unexpected_intr should be hwif-> then we can
1614 * remove all the ifdef PCI crap
1616 #ifdef CONFIG_BLK_DEV_IDEPCI
1617 if (hwif->pci_dev && !hwif->pci_dev->vendor)
1618 #endif /* CONFIG_BLK_DEV_IDEPCI */
1621 * Probably not a shared PCI interrupt,
1622 * so we can safely try to do something about it:
1624 unexpected_intr(irq, hwgroup);
1625 #ifdef CONFIG_BLK_DEV_IDEPCI
1628 * Whack the status register, just in case
1629 * we have a leftover pending IRQ.
1631 (void) hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1632 #endif /* CONFIG_BLK_DEV_IDEPCI */
1634 spin_unlock_irqrestore(&ide_lock, flags);
1637 drive = hwgroup->drive;
1640 * This should NEVER happen, and there isn't much
1641 * we could do about it here.
1643 * [Note - this can occur if the drive is hot unplugged]
1645 spin_unlock_irqrestore(&ide_lock, flags);
1648 if (!drive_is_ready(drive)) {
1650 * This happens regularly when we share a PCI IRQ with
1651 * another device. Unfortunately, it can also happen
1652 * with some buggy drives that trigger the IRQ before
1653 * their status register is up to date. Hopefully we have
1654 * enough advance overhead that the latter isn't a problem.
1656 spin_unlock_irqrestore(&ide_lock, flags);
1659 if (!hwgroup->busy) {
1660 hwgroup->busy = 1; /* paranoia */
1661 printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
1663 hwgroup->handler = NULL;
1665 del_timer(&hwgroup->timer);
1666 spin_unlock(&ide_lock);
1668 /* Some controllers might set DMA INTR no matter DMA or PIO;
1669 * bmdma status might need to be cleared even for
1670 * PIO interrupts to prevent spurious/lost irq.
1672 if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma))
1673 /* ide_dma_end() needs bmdma status for error checking.
1674 * So, skip clearing bmdma status here and leave it
1675 * to ide_dma_end() if this is dma interrupt.
1677 hwif->ide_dma_clear_irq(drive);
1680 local_irq_enable_in_hardirq();
1681 /* service this interrupt, may set handler for next interrupt */
1682 startstop = handler(drive);
1683 spin_lock_irq(&ide_lock);
1686 * Note that handler() may have set things up for another
1687 * interrupt to occur soon, but it cannot happen until
1688 * we exit from this routine, because it will be the
1689 * same irq as is currently being serviced here, and Linux
1690 * won't allow another of the same (on any CPU) until we return.
1692 drive->service_time = jiffies - drive->service_start;
1693 if (startstop == ide_stopped) {
1694 if (hwgroup->handler == NULL) { /* paranoia */
1696 ide_do_request(hwgroup, hwif->irq);
1698 printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler "
1699 "on exit\n", drive->name);
1702 spin_unlock_irqrestore(&ide_lock, flags);
1707 * ide_init_drive_cmd - initialize a drive command request
1708 * @rq: request object
1710 * Initialize a request before we fill it in and send it down to
1711 * ide_do_drive_cmd. Commands must be set up by this function. Right
1712 * now it doesn't do a lot, but if that changes abusers will have a
1716 void ide_init_drive_cmd (struct request *rq)
1718 memset(rq, 0, sizeof(*rq));
1719 rq->cmd_type = REQ_TYPE_ATA_CMD;
1723 EXPORT_SYMBOL(ide_init_drive_cmd);
1726 * ide_do_drive_cmd - issue IDE special command
1727 * @drive: device to issue command
1728 * @rq: request to issue
1729 * @action: action for processing
1731 * This function issues a special IDE device request
1732 * onto the request queue.
1734 * If action is ide_wait, then the rq is queued at the end of the
1735 * request queue, and the function sleeps until it has been processed.
1736 * This is for use when invoked from an ioctl handler.
1738 * If action is ide_preempt, then the rq is queued at the head of
1739 * the request queue, displacing the currently-being-processed
1740 * request and this function returns immediately without waiting
1741 * for the new rq to be completed. This is VERY DANGEROUS, and is
1742 * intended for careful use by the ATAPI tape/cdrom driver code.
1744 * If action is ide_end, then the rq is queued at the end of the
1745 * request queue, and the function returns immediately without waiting
1746 * for the new rq to be completed. This is again intended for careful
1747 * use by the ATAPI tape/cdrom driver code.
1750 int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
1752 unsigned long flags;
1753 ide_hwgroup_t *hwgroup = HWGROUP(drive);
1754 DECLARE_COMPLETION_ONSTACK(wait);
1755 int where = ELEVATOR_INSERT_BACK, err;
1756 int must_wait = (action == ide_wait || action == ide_head_wait);
1761 * we need to hold an extra reference to request for safe inspection
1766 rq->end_io_data = &wait;
1767 rq->end_io = blk_end_sync_rq;
1770 spin_lock_irqsave(&ide_lock, flags);
1771 if (action == ide_preempt)
1773 if (action == ide_preempt || action == ide_head_wait) {
1774 where = ELEVATOR_INSERT_FRONT;
1775 rq->cmd_flags |= REQ_PREEMPT;
1777 __elv_add_request(drive->queue, rq, where, 0);
1778 ide_do_request(hwgroup, IDE_NO_IRQ);
1779 spin_unlock_irqrestore(&ide_lock, flags);
1783 wait_for_completion(&wait);
1787 blk_put_request(rq);
1793 EXPORT_SYMBOL(ide_do_drive_cmd);