145b75e9ae
* Initialize rq->cmd_type in ide_wait_cmd(), ide_cmd_ioctl() and set_pio_mode() (other callers were aleady over-riding rq->cmd_type). * Remove no longer needed rq->cmd_type setup from ide_init_drive_cmd(). Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
1765 lines
49 KiB
C
1765 lines
49 KiB
C
/*
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* IDE I/O functions
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*
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* Basic PIO and command management functionality.
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*
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* This code was split off from ide.c. See ide.c for history and original
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* copyrights.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* For the avoidance of doubt the "preferred form" of this code is one which
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* is in an open non patent encumbered format. Where cryptographic key signing
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* forms part of the process of creating an executable the information
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* including keys needed to generate an equivalently functional executable
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* are deemed to be part of the source code.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/major.h>
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#include <linux/errno.h>
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#include <linux/genhd.h>
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#include <linux/blkpg.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/ide.h>
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#include <linux/completion.h>
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#include <linux/reboot.h>
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#include <linux/cdrom.h>
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#include <linux/seq_file.h>
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#include <linux/device.h>
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#include <linux/kmod.h>
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#include <linux/scatterlist.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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static int __ide_end_request(ide_drive_t *drive, struct request *rq,
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int uptodate, unsigned int nr_bytes, int dequeue)
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{
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int ret = 1;
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/*
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* if failfast is set on a request, override number of sectors and
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* complete the whole request right now
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*/
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if (blk_noretry_request(rq) && end_io_error(uptodate))
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nr_bytes = rq->hard_nr_sectors << 9;
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if (!blk_fs_request(rq) && end_io_error(uptodate) && !rq->errors)
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rq->errors = -EIO;
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/*
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* decide whether to reenable DMA -- 3 is a random magic for now,
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* if we DMA timeout more than 3 times, just stay in PIO
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*/
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if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) {
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drive->state = 0;
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ide_dma_on(drive);
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}
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if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
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add_disk_randomness(rq->rq_disk);
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if (dequeue) {
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if (!list_empty(&rq->queuelist))
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blkdev_dequeue_request(rq);
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HWGROUP(drive)->rq = NULL;
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}
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end_that_request_last(rq, uptodate);
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ret = 0;
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}
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return ret;
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}
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/**
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* ide_end_request - complete an IDE I/O
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* @drive: IDE device for the I/O
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* @uptodate:
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* @nr_sectors: number of sectors completed
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*
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* This is our end_request wrapper function. We complete the I/O
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* update random number input and dequeue the request, which if
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* it was tagged may be out of order.
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*/
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int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
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{
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unsigned int nr_bytes = nr_sectors << 9;
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struct request *rq;
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unsigned long flags;
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int ret = 1;
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/*
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* room for locking improvements here, the calls below don't
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* need the queue lock held at all
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*/
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spin_lock_irqsave(&ide_lock, flags);
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rq = HWGROUP(drive)->rq;
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if (!nr_bytes) {
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if (blk_pc_request(rq))
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nr_bytes = rq->data_len;
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else
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nr_bytes = rq->hard_cur_sectors << 9;
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}
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ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1);
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spin_unlock_irqrestore(&ide_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(ide_end_request);
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/*
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* Power Management state machine. This one is rather trivial for now,
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* we should probably add more, like switching back to PIO on suspend
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* to help some BIOSes, re-do the door locking on resume, etc...
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*/
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enum {
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ide_pm_flush_cache = ide_pm_state_start_suspend,
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idedisk_pm_standby,
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idedisk_pm_restore_pio = ide_pm_state_start_resume,
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idedisk_pm_idle,
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ide_pm_restore_dma,
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};
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static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error)
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{
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struct request_pm_state *pm = rq->data;
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if (drive->media != ide_disk)
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return;
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switch (pm->pm_step) {
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case ide_pm_flush_cache: /* Suspend step 1 (flush cache) complete */
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if (pm->pm_state == PM_EVENT_FREEZE)
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pm->pm_step = ide_pm_state_completed;
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else
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pm->pm_step = idedisk_pm_standby;
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break;
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case idedisk_pm_standby: /* Suspend step 2 (standby) complete */
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pm->pm_step = ide_pm_state_completed;
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break;
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case idedisk_pm_restore_pio: /* Resume step 1 complete */
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pm->pm_step = idedisk_pm_idle;
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break;
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case idedisk_pm_idle: /* Resume step 2 (idle) complete */
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pm->pm_step = ide_pm_restore_dma;
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break;
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}
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}
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static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
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{
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struct request_pm_state *pm = rq->data;
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ide_task_t *args = rq->special;
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memset(args, 0, sizeof(*args));
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switch (pm->pm_step) {
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case ide_pm_flush_cache: /* Suspend step 1 (flush cache) */
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if (drive->media != ide_disk)
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break;
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/* Not supported? Switch to next step now. */
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if (!drive->wcache || !ide_id_has_flush_cache(drive->id)) {
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ide_complete_power_step(drive, rq, 0, 0);
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return ide_stopped;
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}
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if (ide_id_has_flush_cache_ext(drive->id))
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args->tf.command = WIN_FLUSH_CACHE_EXT;
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else
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args->tf.command = WIN_FLUSH_CACHE;
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goto out_do_tf;
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case idedisk_pm_standby: /* Suspend step 2 (standby) */
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args->tf.command = WIN_STANDBYNOW1;
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goto out_do_tf;
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case idedisk_pm_restore_pio: /* Resume step 1 (restore PIO) */
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ide_set_max_pio(drive);
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/*
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* skip idedisk_pm_idle for ATAPI devices
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*/
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if (drive->media != ide_disk)
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pm->pm_step = ide_pm_restore_dma;
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else
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ide_complete_power_step(drive, rq, 0, 0);
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return ide_stopped;
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case idedisk_pm_idle: /* Resume step 2 (idle) */
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args->tf.command = WIN_IDLEIMMEDIATE;
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goto out_do_tf;
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case ide_pm_restore_dma: /* Resume step 3 (restore DMA) */
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/*
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* Right now, all we do is call ide_set_dma(drive),
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* we could be smarter and check for current xfer_speed
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* in struct drive etc...
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*/
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if (drive->hwif->dma_host_set == NULL)
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break;
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/*
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* TODO: respect ->using_dma setting
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*/
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ide_set_dma(drive);
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break;
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}
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pm->pm_step = ide_pm_state_completed;
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return ide_stopped;
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out_do_tf:
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args->tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
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args->data_phase = TASKFILE_NO_DATA;
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return do_rw_taskfile(drive, args);
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}
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/**
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* ide_end_dequeued_request - complete an IDE I/O
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* @drive: IDE device for the I/O
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* @uptodate:
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* @nr_sectors: number of sectors completed
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*
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* Complete an I/O that is no longer on the request queue. This
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* typically occurs when we pull the request and issue a REQUEST_SENSE.
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* We must still finish the old request but we must not tamper with the
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* queue in the meantime.
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*
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* NOTE: This path does not handle barrier, but barrier is not supported
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* on ide-cd anyway.
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*/
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int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq,
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int uptodate, int nr_sectors)
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{
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&ide_lock, flags);
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BUG_ON(!blk_rq_started(rq));
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ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0);
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spin_unlock_irqrestore(&ide_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(ide_end_dequeued_request);
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/**
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* ide_complete_pm_request - end the current Power Management request
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* @drive: target drive
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* @rq: request
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*
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* This function cleans up the current PM request and stops the queue
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* if necessary.
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*/
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static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq)
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{
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unsigned long flags;
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#ifdef DEBUG_PM
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printk("%s: completing PM request, %s\n", drive->name,
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blk_pm_suspend_request(rq) ? "suspend" : "resume");
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#endif
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spin_lock_irqsave(&ide_lock, flags);
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if (blk_pm_suspend_request(rq)) {
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blk_stop_queue(drive->queue);
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} else {
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drive->blocked = 0;
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blk_start_queue(drive->queue);
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}
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blkdev_dequeue_request(rq);
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HWGROUP(drive)->rq = NULL;
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end_that_request_last(rq, 1);
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spin_unlock_irqrestore(&ide_lock, flags);
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}
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void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct ide_taskfile *tf = &task->tf;
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if (task->tf_flags & IDE_TFLAG_IN_DATA) {
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u16 data = hwif->INW(IDE_DATA_REG);
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tf->data = data & 0xff;
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tf->hob_data = (data >> 8) & 0xff;
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}
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/* be sure we're looking at the low order bits */
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hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG);
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if (task->tf_flags & IDE_TFLAG_IN_NSECT)
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tf->nsect = hwif->INB(IDE_NSECTOR_REG);
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if (task->tf_flags & IDE_TFLAG_IN_LBAL)
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tf->lbal = hwif->INB(IDE_SECTOR_REG);
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if (task->tf_flags & IDE_TFLAG_IN_LBAM)
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tf->lbam = hwif->INB(IDE_LCYL_REG);
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if (task->tf_flags & IDE_TFLAG_IN_LBAH)
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tf->lbah = hwif->INB(IDE_HCYL_REG);
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if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
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tf->device = hwif->INB(IDE_SELECT_REG);
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if (task->tf_flags & IDE_TFLAG_LBA48) {
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hwif->OUTB(drive->ctl | 0x80, IDE_CONTROL_REG);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
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tf->hob_feature = hwif->INB(IDE_FEATURE_REG);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
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tf->hob_nsect = hwif->INB(IDE_NSECTOR_REG);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
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tf->hob_lbal = hwif->INB(IDE_SECTOR_REG);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
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tf->hob_lbam = hwif->INB(IDE_LCYL_REG);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
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tf->hob_lbah = hwif->INB(IDE_HCYL_REG);
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}
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}
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/**
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* ide_end_drive_cmd - end an explicit drive command
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* @drive: command
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* @stat: status bits
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* @err: error bits
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*
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* Clean up after success/failure of an explicit drive command.
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* These get thrown onto the queue so they are synchronized with
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* real I/O operations on the drive.
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*
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* In LBA48 mode we have to read the register set twice to get
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* all the extra information out.
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*/
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void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
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{
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ide_hwif_t *hwif = HWIF(drive);
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unsigned long flags;
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struct request *rq;
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spin_lock_irqsave(&ide_lock, flags);
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rq = HWGROUP(drive)->rq;
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spin_unlock_irqrestore(&ide_lock, flags);
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|
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if (rq->cmd_type == REQ_TYPE_ATA_CMD) {
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u8 *args = (u8 *) rq->buffer;
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if (rq->errors == 0)
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rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
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if (args) {
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args[0] = stat;
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args[1] = err;
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/* be sure we're looking at the low order bits */
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hwif->OUTB(drive->ctl & ~0x80, IDE_CONTROL_REG);
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args[2] = hwif->INB(IDE_NSECTOR_REG);
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}
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} else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
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ide_task_t *args = (ide_task_t *) rq->special;
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if (rq->errors == 0)
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rq->errors = !OK_STAT(stat,READY_STAT,BAD_STAT);
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|
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if (args) {
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struct ide_taskfile *tf = &args->tf;
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|
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tf->error = err;
|
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tf->status = stat;
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|
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ide_tf_read(drive, args);
|
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}
|
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} else if (blk_pm_request(rq)) {
|
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struct request_pm_state *pm = rq->data;
|
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#ifdef DEBUG_PM
|
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printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
|
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drive->name, rq->pm->pm_step, stat, err);
|
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#endif
|
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ide_complete_power_step(drive, rq, stat, err);
|
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if (pm->pm_step == ide_pm_state_completed)
|
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ide_complete_pm_request(drive, rq);
|
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return;
|
|
}
|
|
|
|
spin_lock_irqsave(&ide_lock, flags);
|
|
blkdev_dequeue_request(rq);
|
|
HWGROUP(drive)->rq = NULL;
|
|
rq->errors = err;
|
|
end_that_request_last(rq, !rq->errors);
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
}
|
|
|
|
EXPORT_SYMBOL(ide_end_drive_cmd);
|
|
|
|
/**
|
|
* try_to_flush_leftover_data - flush junk
|
|
* @drive: drive to flush
|
|
*
|
|
* try_to_flush_leftover_data() is invoked in response to a drive
|
|
* unexpectedly having its DRQ_STAT bit set. As an alternative to
|
|
* resetting the drive, this routine tries to clear the condition
|
|
* by read a sector's worth of data from the drive. Of course,
|
|
* this may not help if the drive is *waiting* for data from *us*.
|
|
*/
|
|
static void try_to_flush_leftover_data (ide_drive_t *drive)
|
|
{
|
|
int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
|
|
|
|
if (drive->media != ide_disk)
|
|
return;
|
|
while (i > 0) {
|
|
u32 buffer[16];
|
|
u32 wcount = (i > 16) ? 16 : i;
|
|
|
|
i -= wcount;
|
|
HWIF(drive)->ata_input_data(drive, buffer, wcount);
|
|
}
|
|
}
|
|
|
|
static void ide_kill_rq(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
if (rq->rq_disk) {
|
|
ide_driver_t *drv;
|
|
|
|
drv = *(ide_driver_t **)rq->rq_disk->private_data;
|
|
drv->end_request(drive, 0, 0);
|
|
} else
|
|
ide_end_request(drive, 0, 0);
|
|
}
|
|
|
|
static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
|
|
if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
|
|
/* other bits are useless when BUSY */
|
|
rq->errors |= ERROR_RESET;
|
|
} else if (stat & ERR_STAT) {
|
|
/* err has different meaning on cdrom and tape */
|
|
if (err == ABRT_ERR) {
|
|
if (drive->select.b.lba &&
|
|
/* some newer drives don't support WIN_SPECIFY */
|
|
hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY)
|
|
return ide_stopped;
|
|
} else if ((err & BAD_CRC) == BAD_CRC) {
|
|
/* UDMA crc error, just retry the operation */
|
|
drive->crc_count++;
|
|
} else if (err & (BBD_ERR | ECC_ERR)) {
|
|
/* retries won't help these */
|
|
rq->errors = ERROR_MAX;
|
|
} else if (err & TRK0_ERR) {
|
|
/* help it find track zero */
|
|
rq->errors |= ERROR_RECAL;
|
|
}
|
|
}
|
|
|
|
if ((stat & DRQ_STAT) && rq_data_dir(rq) == READ &&
|
|
(hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0)
|
|
try_to_flush_leftover_data(drive);
|
|
|
|
if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) {
|
|
ide_kill_rq(drive, rq);
|
|
return ide_stopped;
|
|
}
|
|
|
|
if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
|
|
rq->errors |= ERROR_RESET;
|
|
|
|
if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
|
|
++rq->errors;
|
|
return ide_do_reset(drive);
|
|
}
|
|
|
|
if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
|
|
drive->special.b.recalibrate = 1;
|
|
|
|
++rq->errors;
|
|
|
|
return ide_stopped;
|
|
}
|
|
|
|
static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
|
|
if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
|
|
/* other bits are useless when BUSY */
|
|
rq->errors |= ERROR_RESET;
|
|
} else {
|
|
/* add decoding error stuff */
|
|
}
|
|
|
|
if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
|
|
/* force an abort */
|
|
hwif->OUTB(WIN_IDLEIMMEDIATE, IDE_COMMAND_REG);
|
|
|
|
if (rq->errors >= ERROR_MAX) {
|
|
ide_kill_rq(drive, rq);
|
|
} else {
|
|
if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
|
|
++rq->errors;
|
|
return ide_do_reset(drive);
|
|
}
|
|
++rq->errors;
|
|
}
|
|
|
|
return ide_stopped;
|
|
}
|
|
|
|
ide_startstop_t
|
|
__ide_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
|
|
{
|
|
if (drive->media == ide_disk)
|
|
return ide_ata_error(drive, rq, stat, err);
|
|
return ide_atapi_error(drive, rq, stat, err);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__ide_error);
|
|
|
|
/**
|
|
* ide_error - handle an error on the IDE
|
|
* @drive: drive the error occurred on
|
|
* @msg: message to report
|
|
* @stat: status bits
|
|
*
|
|
* ide_error() takes action based on the error returned by the drive.
|
|
* For normal I/O that may well include retries. We deal with
|
|
* both new-style (taskfile) and old style command handling here.
|
|
* In the case of taskfile command handling there is work left to
|
|
* do
|
|
*/
|
|
|
|
ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat)
|
|
{
|
|
struct request *rq;
|
|
u8 err;
|
|
|
|
err = ide_dump_status(drive, msg, stat);
|
|
|
|
if ((rq = HWGROUP(drive)->rq) == NULL)
|
|
return ide_stopped;
|
|
|
|
/* retry only "normal" I/O: */
|
|
if (!blk_fs_request(rq)) {
|
|
rq->errors = 1;
|
|
ide_end_drive_cmd(drive, stat, err);
|
|
return ide_stopped;
|
|
}
|
|
|
|
if (rq->rq_disk) {
|
|
ide_driver_t *drv;
|
|
|
|
drv = *(ide_driver_t **)rq->rq_disk->private_data;
|
|
return drv->error(drive, rq, stat, err);
|
|
} else
|
|
return __ide_error(drive, rq, stat, err);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ide_error);
|
|
|
|
ide_startstop_t __ide_abort(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
if (drive->media != ide_disk)
|
|
rq->errors |= ERROR_RESET;
|
|
|
|
ide_kill_rq(drive, rq);
|
|
|
|
return ide_stopped;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__ide_abort);
|
|
|
|
/**
|
|
* ide_abort - abort pending IDE operations
|
|
* @drive: drive the error occurred on
|
|
* @msg: message to report
|
|
*
|
|
* ide_abort kills and cleans up when we are about to do a
|
|
* host initiated reset on active commands. Longer term we
|
|
* want handlers to have sensible abort handling themselves
|
|
*
|
|
* This differs fundamentally from ide_error because in
|
|
* this case the command is doing just fine when we
|
|
* blow it away.
|
|
*/
|
|
|
|
ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg)
|
|
{
|
|
struct request *rq;
|
|
|
|
if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
|
|
return ide_stopped;
|
|
|
|
/* retry only "normal" I/O: */
|
|
if (!blk_fs_request(rq)) {
|
|
rq->errors = 1;
|
|
ide_end_drive_cmd(drive, BUSY_STAT, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
if (rq->rq_disk) {
|
|
ide_driver_t *drv;
|
|
|
|
drv = *(ide_driver_t **)rq->rq_disk->private_data;
|
|
return drv->abort(drive, rq);
|
|
} else
|
|
return __ide_abort(drive, rq);
|
|
}
|
|
|
|
/**
|
|
* drive_cmd_intr - drive command completion interrupt
|
|
* @drive: drive the completion interrupt occurred on
|
|
*
|
|
* drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
|
|
* We do any necessary data reading and then wait for the drive to
|
|
* go non busy. At that point we may read the error data and complete
|
|
* the request
|
|
*/
|
|
|
|
static ide_startstop_t drive_cmd_intr (ide_drive_t *drive)
|
|
{
|
|
struct request *rq = HWGROUP(drive)->rq;
|
|
ide_hwif_t *hwif = HWIF(drive);
|
|
u8 *args = (u8 *) rq->buffer;
|
|
u8 stat = hwif->INB(IDE_STATUS_REG);
|
|
|
|
local_irq_enable_in_hardirq();
|
|
if (rq->cmd_type == REQ_TYPE_ATA_CMD &&
|
|
(stat & DRQ_STAT) && args && args[3]) {
|
|
u8 io_32bit = drive->io_32bit;
|
|
drive->io_32bit = 0;
|
|
hwif->ata_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
|
|
drive->io_32bit = io_32bit;
|
|
stat = wait_drive_not_busy(drive);
|
|
}
|
|
|
|
if (!OK_STAT(stat, READY_STAT, BAD_STAT))
|
|
return ide_error(drive, "drive_cmd", stat);
|
|
/* calls ide_end_drive_cmd */
|
|
ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
|
|
return ide_stopped;
|
|
}
|
|
|
|
static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
|
|
{
|
|
tf->nsect = drive->sect;
|
|
tf->lbal = drive->sect;
|
|
tf->lbam = drive->cyl;
|
|
tf->lbah = drive->cyl >> 8;
|
|
tf->device = ((drive->head - 1) | drive->select.all) & ~ATA_LBA;
|
|
tf->command = WIN_SPECIFY;
|
|
}
|
|
|
|
static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
|
|
{
|
|
tf->nsect = drive->sect;
|
|
tf->command = WIN_RESTORE;
|
|
}
|
|
|
|
static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf)
|
|
{
|
|
tf->nsect = drive->mult_req;
|
|
tf->command = WIN_SETMULT;
|
|
}
|
|
|
|
static ide_startstop_t ide_disk_special(ide_drive_t *drive)
|
|
{
|
|
special_t *s = &drive->special;
|
|
ide_task_t args;
|
|
|
|
memset(&args, 0, sizeof(ide_task_t));
|
|
args.data_phase = TASKFILE_NO_DATA;
|
|
|
|
if (s->b.set_geometry) {
|
|
s->b.set_geometry = 0;
|
|
ide_tf_set_specify_cmd(drive, &args.tf);
|
|
} else if (s->b.recalibrate) {
|
|
s->b.recalibrate = 0;
|
|
ide_tf_set_restore_cmd(drive, &args.tf);
|
|
} else if (s->b.set_multmode) {
|
|
s->b.set_multmode = 0;
|
|
if (drive->mult_req > drive->id->max_multsect)
|
|
drive->mult_req = drive->id->max_multsect;
|
|
ide_tf_set_setmult_cmd(drive, &args.tf);
|
|
} else if (s->all) {
|
|
int special = s->all;
|
|
s->all = 0;
|
|
printk(KERN_ERR "%s: bad special flag: 0x%02x\n", drive->name, special);
|
|
return ide_stopped;
|
|
}
|
|
|
|
args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE |
|
|
IDE_TFLAG_CUSTOM_HANDLER;
|
|
|
|
do_rw_taskfile(drive, &args);
|
|
|
|
return ide_started;
|
|
}
|
|
|
|
/*
|
|
* handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
|
|
*/
|
|
static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
|
|
{
|
|
switch (req_pio) {
|
|
case 202:
|
|
case 201:
|
|
case 200:
|
|
case 102:
|
|
case 101:
|
|
case 100:
|
|
return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
|
|
case 9:
|
|
case 8:
|
|
return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
|
|
case 7:
|
|
case 6:
|
|
return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* do_special - issue some special commands
|
|
* @drive: drive the command is for
|
|
*
|
|
* do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
|
|
* commands to a drive. It used to do much more, but has been scaled
|
|
* back.
|
|
*/
|
|
|
|
static ide_startstop_t do_special (ide_drive_t *drive)
|
|
{
|
|
special_t *s = &drive->special;
|
|
|
|
#ifdef DEBUG
|
|
printk("%s: do_special: 0x%02x\n", drive->name, s->all);
|
|
#endif
|
|
if (s->b.set_tune) {
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
u8 req_pio = drive->tune_req;
|
|
|
|
s->b.set_tune = 0;
|
|
|
|
if (set_pio_mode_abuse(drive->hwif, req_pio)) {
|
|
|
|
if (hwif->set_pio_mode == NULL)
|
|
return ide_stopped;
|
|
|
|
/*
|
|
* take ide_lock for drive->[no_]unmask/[no_]io_32bit
|
|
*/
|
|
if (req_pio == 8 || req_pio == 9) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ide_lock, flags);
|
|
hwif->set_pio_mode(drive, req_pio);
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
} else
|
|
hwif->set_pio_mode(drive, req_pio);
|
|
} else {
|
|
int keep_dma = drive->using_dma;
|
|
|
|
ide_set_pio(drive, req_pio);
|
|
|
|
if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
|
|
if (keep_dma)
|
|
ide_dma_on(drive);
|
|
}
|
|
}
|
|
|
|
return ide_stopped;
|
|
} else {
|
|
if (drive->media == ide_disk)
|
|
return ide_disk_special(drive);
|
|
|
|
s->all = 0;
|
|
drive->mult_req = 0;
|
|
return ide_stopped;
|
|
}
|
|
}
|
|
|
|
void ide_map_sg(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
struct scatterlist *sg = hwif->sg_table;
|
|
|
|
if (hwif->sg_mapped) /* needed by ide-scsi */
|
|
return;
|
|
|
|
if (rq->cmd_type != REQ_TYPE_ATA_TASKFILE) {
|
|
hwif->sg_nents = blk_rq_map_sg(drive->queue, rq, sg);
|
|
} else {
|
|
sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
|
|
hwif->sg_nents = 1;
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ide_map_sg);
|
|
|
|
void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
|
|
hwif->nsect = hwif->nleft = rq->nr_sectors;
|
|
hwif->cursg_ofs = 0;
|
|
hwif->cursg = NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
|
|
|
|
/**
|
|
* execute_drive_command - issue special drive command
|
|
* @drive: the drive to issue the command on
|
|
* @rq: the request structure holding the command
|
|
*
|
|
* execute_drive_cmd() issues a special drive command, usually
|
|
* initiated by ioctl() from the external hdparm program. The
|
|
* command can be a drive command, drive task or taskfile
|
|
* operation. Weirdly you can call it with NULL to wait for
|
|
* all commands to finish. Don't do this as that is due to change
|
|
*/
|
|
|
|
static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
|
|
struct request *rq)
|
|
{
|
|
ide_hwif_t *hwif = HWIF(drive);
|
|
u8 *args = rq->buffer;
|
|
ide_task_t ltask;
|
|
struct ide_taskfile *tf = <ask.tf;
|
|
|
|
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
|
|
ide_task_t *task = rq->special;
|
|
|
|
if (task == NULL)
|
|
goto done;
|
|
|
|
hwif->data_phase = task->data_phase;
|
|
|
|
switch (hwif->data_phase) {
|
|
case TASKFILE_MULTI_OUT:
|
|
case TASKFILE_OUT:
|
|
case TASKFILE_MULTI_IN:
|
|
case TASKFILE_IN:
|
|
ide_init_sg_cmd(drive, rq);
|
|
ide_map_sg(drive, rq);
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return do_rw_taskfile(drive, task);
|
|
}
|
|
|
|
if (args == NULL)
|
|
goto done;
|
|
|
|
memset(<ask, 0, sizeof(ltask));
|
|
if (rq->cmd_type == REQ_TYPE_ATA_CMD) {
|
|
#ifdef DEBUG
|
|
printk("%s: DRIVE_CMD\n", drive->name);
|
|
#endif
|
|
tf->feature = args[2];
|
|
if (args[0] == WIN_SMART) {
|
|
tf->nsect = args[3];
|
|
tf->lbal = args[1];
|
|
tf->lbam = 0x4f;
|
|
tf->lbah = 0xc2;
|
|
ltask.tf_flags = IDE_TFLAG_OUT_TF;
|
|
} else {
|
|
tf->nsect = args[1];
|
|
ltask.tf_flags = IDE_TFLAG_OUT_FEATURE |
|
|
IDE_TFLAG_OUT_NSECT;
|
|
}
|
|
}
|
|
tf->command = args[0];
|
|
ide_tf_load(drive, <ask);
|
|
ide_execute_command(drive, args[0], &drive_cmd_intr, WAIT_WORSTCASE, NULL);
|
|
return ide_started;
|
|
|
|
done:
|
|
/*
|
|
* NULL is actually a valid way of waiting for
|
|
* all current requests to be flushed from the queue.
|
|
*/
|
|
#ifdef DEBUG
|
|
printk("%s: DRIVE_CMD (null)\n", drive->name);
|
|
#endif
|
|
ide_end_drive_cmd(drive,
|
|
hwif->INB(IDE_STATUS_REG),
|
|
hwif->INB(IDE_ERROR_REG));
|
|
return ide_stopped;
|
|
}
|
|
|
|
static void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
|
|
{
|
|
struct request_pm_state *pm = rq->data;
|
|
|
|
if (blk_pm_suspend_request(rq) &&
|
|
pm->pm_step == ide_pm_state_start_suspend)
|
|
/* Mark drive blocked when starting the suspend sequence. */
|
|
drive->blocked = 1;
|
|
else if (blk_pm_resume_request(rq) &&
|
|
pm->pm_step == ide_pm_state_start_resume) {
|
|
/*
|
|
* The first thing we do on wakeup is to wait for BSY bit to
|
|
* go away (with a looong timeout) as a drive on this hwif may
|
|
* just be POSTing itself.
|
|
* We do that before even selecting as the "other" device on
|
|
* the bus may be broken enough to walk on our toes at this
|
|
* point.
|
|
*/
|
|
int rc;
|
|
#ifdef DEBUG_PM
|
|
printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
|
|
#endif
|
|
rc = ide_wait_not_busy(HWIF(drive), 35000);
|
|
if (rc)
|
|
printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
|
|
SELECT_DRIVE(drive);
|
|
ide_set_irq(drive, 1);
|
|
rc = ide_wait_not_busy(HWIF(drive), 100000);
|
|
if (rc)
|
|
printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* start_request - start of I/O and command issuing for IDE
|
|
*
|
|
* start_request() initiates handling of a new I/O request. It
|
|
* accepts commands and I/O (read/write) requests. It also does
|
|
* the final remapping for weird stuff like EZDrive. Once
|
|
* device mapper can work sector level the EZDrive stuff can go away
|
|
*
|
|
* FIXME: this function needs a rename
|
|
*/
|
|
|
|
static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
|
|
{
|
|
ide_startstop_t startstop;
|
|
sector_t block;
|
|
|
|
BUG_ON(!blk_rq_started(rq));
|
|
|
|
#ifdef DEBUG
|
|
printk("%s: start_request: current=0x%08lx\n",
|
|
HWIF(drive)->name, (unsigned long) rq);
|
|
#endif
|
|
|
|
/* bail early if we've exceeded max_failures */
|
|
if (drive->max_failures && (drive->failures > drive->max_failures)) {
|
|
rq->cmd_flags |= REQ_FAILED;
|
|
goto kill_rq;
|
|
}
|
|
|
|
block = rq->sector;
|
|
if (blk_fs_request(rq) &&
|
|
(drive->media == ide_disk || drive->media == ide_floppy)) {
|
|
block += drive->sect0;
|
|
}
|
|
/* Yecch - this will shift the entire interval,
|
|
possibly killing some innocent following sector */
|
|
if (block == 0 && drive->remap_0_to_1 == 1)
|
|
block = 1; /* redirect MBR access to EZ-Drive partn table */
|
|
|
|
if (blk_pm_request(rq))
|
|
ide_check_pm_state(drive, rq);
|
|
|
|
SELECT_DRIVE(drive);
|
|
if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
|
|
printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
|
|
return startstop;
|
|
}
|
|
if (!drive->special.all) {
|
|
ide_driver_t *drv;
|
|
|
|
/*
|
|
* We reset the drive so we need to issue a SETFEATURES.
|
|
* Do it _after_ do_special() restored device parameters.
|
|
*/
|
|
if (drive->current_speed == 0xff)
|
|
ide_config_drive_speed(drive, drive->desired_speed);
|
|
|
|
if (rq->cmd_type == REQ_TYPE_ATA_CMD ||
|
|
rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
|
|
return execute_drive_cmd(drive, rq);
|
|
else if (blk_pm_request(rq)) {
|
|
struct request_pm_state *pm = rq->data;
|
|
#ifdef DEBUG_PM
|
|
printk("%s: start_power_step(step: %d)\n",
|
|
drive->name, rq->pm->pm_step);
|
|
#endif
|
|
startstop = ide_start_power_step(drive, rq);
|
|
if (startstop == ide_stopped &&
|
|
pm->pm_step == ide_pm_state_completed)
|
|
ide_complete_pm_request(drive, rq);
|
|
return startstop;
|
|
}
|
|
|
|
drv = *(ide_driver_t **)rq->rq_disk->private_data;
|
|
return drv->do_request(drive, rq, block);
|
|
}
|
|
return do_special(drive);
|
|
kill_rq:
|
|
ide_kill_rq(drive, rq);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/**
|
|
* ide_stall_queue - pause an IDE device
|
|
* @drive: drive to stall
|
|
* @timeout: time to stall for (jiffies)
|
|
*
|
|
* ide_stall_queue() can be used by a drive to give excess bandwidth back
|
|
* to the hwgroup by sleeping for timeout jiffies.
|
|
*/
|
|
|
|
void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
|
|
{
|
|
if (timeout > WAIT_WORSTCASE)
|
|
timeout = WAIT_WORSTCASE;
|
|
drive->sleep = timeout + jiffies;
|
|
drive->sleeping = 1;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ide_stall_queue);
|
|
|
|
#define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
|
|
|
|
/**
|
|
* choose_drive - select a drive to service
|
|
* @hwgroup: hardware group to select on
|
|
*
|
|
* choose_drive() selects the next drive which will be serviced.
|
|
* This is necessary because the IDE layer can't issue commands
|
|
* to both drives on the same cable, unlike SCSI.
|
|
*/
|
|
|
|
static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup)
|
|
{
|
|
ide_drive_t *drive, *best;
|
|
|
|
repeat:
|
|
best = NULL;
|
|
drive = hwgroup->drive;
|
|
|
|
/*
|
|
* drive is doing pre-flush, ordered write, post-flush sequence. even
|
|
* though that is 3 requests, it must be seen as a single transaction.
|
|
* we must not preempt this drive until that is complete
|
|
*/
|
|
if (blk_queue_flushing(drive->queue)) {
|
|
/*
|
|
* small race where queue could get replugged during
|
|
* the 3-request flush cycle, just yank the plug since
|
|
* we want it to finish asap
|
|
*/
|
|
blk_remove_plug(drive->queue);
|
|
return drive;
|
|
}
|
|
|
|
do {
|
|
if ((!drive->sleeping || time_after_eq(jiffies, drive->sleep))
|
|
&& !elv_queue_empty(drive->queue)) {
|
|
if (!best
|
|
|| (drive->sleeping && (!best->sleeping || time_before(drive->sleep, best->sleep)))
|
|
|| (!best->sleeping && time_before(WAKEUP(drive), WAKEUP(best))))
|
|
{
|
|
if (!blk_queue_plugged(drive->queue))
|
|
best = drive;
|
|
}
|
|
}
|
|
} while ((drive = drive->next) != hwgroup->drive);
|
|
if (best && best->nice1 && !best->sleeping && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) {
|
|
long t = (signed long)(WAKEUP(best) - jiffies);
|
|
if (t >= WAIT_MIN_SLEEP) {
|
|
/*
|
|
* We *may* have some time to spare, but first let's see if
|
|
* someone can potentially benefit from our nice mood today..
|
|
*/
|
|
drive = best->next;
|
|
do {
|
|
if (!drive->sleeping
|
|
&& time_before(jiffies - best->service_time, WAKEUP(drive))
|
|
&& time_before(WAKEUP(drive), jiffies + t))
|
|
{
|
|
ide_stall_queue(best, min_t(long, t, 10 * WAIT_MIN_SLEEP));
|
|
goto repeat;
|
|
}
|
|
} while ((drive = drive->next) != best);
|
|
}
|
|
}
|
|
return best;
|
|
}
|
|
|
|
/*
|
|
* Issue a new request to a drive from hwgroup
|
|
* Caller must have already done spin_lock_irqsave(&ide_lock, ..);
|
|
*
|
|
* A hwgroup is a serialized group of IDE interfaces. Usually there is
|
|
* exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
|
|
* may have both interfaces in a single hwgroup to "serialize" access.
|
|
* Or possibly multiple ISA interfaces can share a common IRQ by being grouped
|
|
* together into one hwgroup for serialized access.
|
|
*
|
|
* Note also that several hwgroups can end up sharing a single IRQ,
|
|
* possibly along with many other devices. This is especially common in
|
|
* PCI-based systems with off-board IDE controller cards.
|
|
*
|
|
* The IDE driver uses the single global ide_lock spinlock to protect
|
|
* access to the request queues, and to protect the hwgroup->busy flag.
|
|
*
|
|
* The first thread into the driver for a particular hwgroup sets the
|
|
* hwgroup->busy flag to indicate that this hwgroup is now active,
|
|
* and then initiates processing of the top request from the request queue.
|
|
*
|
|
* Other threads attempting entry notice the busy setting, and will simply
|
|
* queue their new requests and exit immediately. Note that hwgroup->busy
|
|
* remains set even when the driver is merely awaiting the next interrupt.
|
|
* Thus, the meaning is "this hwgroup is busy processing a request".
|
|
*
|
|
* When processing of a request completes, the completing thread or IRQ-handler
|
|
* will start the next request from the queue. If no more work remains,
|
|
* the driver will clear the hwgroup->busy flag and exit.
|
|
*
|
|
* The ide_lock (spinlock) is used to protect all access to the
|
|
* hwgroup->busy flag, but is otherwise not needed for most processing in
|
|
* the driver. This makes the driver much more friendlier to shared IRQs
|
|
* than previous designs, while remaining 100% (?) SMP safe and capable.
|
|
*/
|
|
static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
|
|
{
|
|
ide_drive_t *drive;
|
|
ide_hwif_t *hwif;
|
|
struct request *rq;
|
|
ide_startstop_t startstop;
|
|
int loops = 0;
|
|
|
|
/* for atari only: POSSIBLY BROKEN HERE(?) */
|
|
ide_get_lock(ide_intr, hwgroup);
|
|
|
|
/* caller must own ide_lock */
|
|
BUG_ON(!irqs_disabled());
|
|
|
|
while (!hwgroup->busy) {
|
|
hwgroup->busy = 1;
|
|
drive = choose_drive(hwgroup);
|
|
if (drive == NULL) {
|
|
int sleeping = 0;
|
|
unsigned long sleep = 0; /* shut up, gcc */
|
|
hwgroup->rq = NULL;
|
|
drive = hwgroup->drive;
|
|
do {
|
|
if (drive->sleeping && (!sleeping || time_before(drive->sleep, sleep))) {
|
|
sleeping = 1;
|
|
sleep = drive->sleep;
|
|
}
|
|
} while ((drive = drive->next) != hwgroup->drive);
|
|
if (sleeping) {
|
|
/*
|
|
* Take a short snooze, and then wake up this hwgroup again.
|
|
* This gives other hwgroups on the same a chance to
|
|
* play fairly with us, just in case there are big differences
|
|
* in relative throughputs.. don't want to hog the cpu too much.
|
|
*/
|
|
if (time_before(sleep, jiffies + WAIT_MIN_SLEEP))
|
|
sleep = jiffies + WAIT_MIN_SLEEP;
|
|
#if 1
|
|
if (timer_pending(&hwgroup->timer))
|
|
printk(KERN_CRIT "ide_set_handler: timer already active\n");
|
|
#endif
|
|
/* so that ide_timer_expiry knows what to do */
|
|
hwgroup->sleeping = 1;
|
|
hwgroup->req_gen_timer = hwgroup->req_gen;
|
|
mod_timer(&hwgroup->timer, sleep);
|
|
/* we purposely leave hwgroup->busy==1
|
|
* while sleeping */
|
|
} else {
|
|
/* Ugly, but how can we sleep for the lock
|
|
* otherwise? perhaps from tq_disk?
|
|
*/
|
|
|
|
/* for atari only */
|
|
ide_release_lock();
|
|
hwgroup->busy = 0;
|
|
}
|
|
|
|
/* no more work for this hwgroup (for now) */
|
|
return;
|
|
}
|
|
again:
|
|
hwif = HWIF(drive);
|
|
if (hwgroup->hwif->sharing_irq && hwif != hwgroup->hwif) {
|
|
/*
|
|
* set nIEN for previous hwif, drives in the
|
|
* quirk_list may not like intr setups/cleanups
|
|
*/
|
|
if (drive->quirk_list != 1)
|
|
ide_set_irq(drive, 0);
|
|
}
|
|
hwgroup->hwif = hwif;
|
|
hwgroup->drive = drive;
|
|
drive->sleeping = 0;
|
|
drive->service_start = jiffies;
|
|
|
|
if (blk_queue_plugged(drive->queue)) {
|
|
printk(KERN_ERR "ide: huh? queue was plugged!\n");
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* we know that the queue isn't empty, but this can happen
|
|
* if the q->prep_rq_fn() decides to kill a request
|
|
*/
|
|
rq = elv_next_request(drive->queue);
|
|
if (!rq) {
|
|
hwgroup->busy = 0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Sanity: don't accept a request that isn't a PM request
|
|
* if we are currently power managed. This is very important as
|
|
* blk_stop_queue() doesn't prevent the elv_next_request()
|
|
* above to return us whatever is in the queue. Since we call
|
|
* ide_do_request() ourselves, we end up taking requests while
|
|
* the queue is blocked...
|
|
*
|
|
* We let requests forced at head of queue with ide-preempt
|
|
* though. I hope that doesn't happen too much, hopefully not
|
|
* unless the subdriver triggers such a thing in its own PM
|
|
* state machine.
|
|
*
|
|
* We count how many times we loop here to make sure we service
|
|
* all drives in the hwgroup without looping for ever
|
|
*/
|
|
if (drive->blocked && !blk_pm_request(rq) && !(rq->cmd_flags & REQ_PREEMPT)) {
|
|
drive = drive->next ? drive->next : hwgroup->drive;
|
|
if (loops++ < 4 && !blk_queue_plugged(drive->queue))
|
|
goto again;
|
|
/* We clear busy, there should be no pending ATA command at this point. */
|
|
hwgroup->busy = 0;
|
|
break;
|
|
}
|
|
|
|
hwgroup->rq = rq;
|
|
|
|
/*
|
|
* Some systems have trouble with IDE IRQs arriving while
|
|
* the driver is still setting things up. So, here we disable
|
|
* the IRQ used by this interface while the request is being started.
|
|
* This may look bad at first, but pretty much the same thing
|
|
* happens anyway when any interrupt comes in, IDE or otherwise
|
|
* -- the kernel masks the IRQ while it is being handled.
|
|
*/
|
|
if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
|
|
disable_irq_nosync(hwif->irq);
|
|
spin_unlock(&ide_lock);
|
|
local_irq_enable_in_hardirq();
|
|
/* allow other IRQs while we start this request */
|
|
startstop = start_request(drive, rq);
|
|
spin_lock_irq(&ide_lock);
|
|
if (masked_irq != IDE_NO_IRQ && hwif->irq != masked_irq)
|
|
enable_irq(hwif->irq);
|
|
if (startstop == ide_stopped)
|
|
hwgroup->busy = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Passes the stuff to ide_do_request
|
|
*/
|
|
void do_ide_request(struct request_queue *q)
|
|
{
|
|
ide_drive_t *drive = q->queuedata;
|
|
|
|
ide_do_request(HWGROUP(drive), IDE_NO_IRQ);
|
|
}
|
|
|
|
/*
|
|
* un-busy the hwgroup etc, and clear any pending DMA status. we want to
|
|
* retry the current request in pio mode instead of risking tossing it
|
|
* all away
|
|
*/
|
|
static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
|
|
{
|
|
ide_hwif_t *hwif = HWIF(drive);
|
|
struct request *rq;
|
|
ide_startstop_t ret = ide_stopped;
|
|
|
|
/*
|
|
* end current dma transaction
|
|
*/
|
|
|
|
if (error < 0) {
|
|
printk(KERN_WARNING "%s: DMA timeout error\n", drive->name);
|
|
(void)HWIF(drive)->ide_dma_end(drive);
|
|
ret = ide_error(drive, "dma timeout error",
|
|
hwif->INB(IDE_STATUS_REG));
|
|
} else {
|
|
printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
|
|
hwif->dma_timeout(drive);
|
|
}
|
|
|
|
/*
|
|
* disable dma for now, but remember that we did so because of
|
|
* a timeout -- we'll reenable after we finish this next request
|
|
* (or rather the first chunk of it) in pio.
|
|
*/
|
|
drive->retry_pio++;
|
|
drive->state = DMA_PIO_RETRY;
|
|
ide_dma_off_quietly(drive);
|
|
|
|
/*
|
|
* un-busy drive etc (hwgroup->busy is cleared on return) and
|
|
* make sure request is sane
|
|
*/
|
|
rq = HWGROUP(drive)->rq;
|
|
|
|
if (!rq)
|
|
goto out;
|
|
|
|
HWGROUP(drive)->rq = NULL;
|
|
|
|
rq->errors = 0;
|
|
|
|
if (!rq->bio)
|
|
goto out;
|
|
|
|
rq->sector = rq->bio->bi_sector;
|
|
rq->current_nr_sectors = bio_iovec(rq->bio)->bv_len >> 9;
|
|
rq->hard_cur_sectors = rq->current_nr_sectors;
|
|
rq->buffer = bio_data(rq->bio);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ide_timer_expiry - handle lack of an IDE interrupt
|
|
* @data: timer callback magic (hwgroup)
|
|
*
|
|
* An IDE command has timed out before the expected drive return
|
|
* occurred. At this point we attempt to clean up the current
|
|
* mess. If the current handler includes an expiry handler then
|
|
* we invoke the expiry handler, and providing it is happy the
|
|
* work is done. If that fails we apply generic recovery rules
|
|
* invoking the handler and checking the drive DMA status. We
|
|
* have an excessively incestuous relationship with the DMA
|
|
* logic that wants cleaning up.
|
|
*/
|
|
|
|
void ide_timer_expiry (unsigned long data)
|
|
{
|
|
ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
|
|
ide_handler_t *handler;
|
|
ide_expiry_t *expiry;
|
|
unsigned long flags;
|
|
unsigned long wait = -1;
|
|
|
|
spin_lock_irqsave(&ide_lock, flags);
|
|
|
|
if (((handler = hwgroup->handler) == NULL) ||
|
|
(hwgroup->req_gen != hwgroup->req_gen_timer)) {
|
|
/*
|
|
* Either a marginal timeout occurred
|
|
* (got the interrupt just as timer expired),
|
|
* or we were "sleeping" to give other devices a chance.
|
|
* Either way, we don't really want to complain about anything.
|
|
*/
|
|
if (hwgroup->sleeping) {
|
|
hwgroup->sleeping = 0;
|
|
hwgroup->busy = 0;
|
|
}
|
|
} else {
|
|
ide_drive_t *drive = hwgroup->drive;
|
|
if (!drive) {
|
|
printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n");
|
|
hwgroup->handler = NULL;
|
|
} else {
|
|
ide_hwif_t *hwif;
|
|
ide_startstop_t startstop = ide_stopped;
|
|
if (!hwgroup->busy) {
|
|
hwgroup->busy = 1; /* paranoia */
|
|
printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name);
|
|
}
|
|
if ((expiry = hwgroup->expiry) != NULL) {
|
|
/* continue */
|
|
if ((wait = expiry(drive)) > 0) {
|
|
/* reset timer */
|
|
hwgroup->timer.expires = jiffies + wait;
|
|
hwgroup->req_gen_timer = hwgroup->req_gen;
|
|
add_timer(&hwgroup->timer);
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
return;
|
|
}
|
|
}
|
|
hwgroup->handler = NULL;
|
|
/*
|
|
* We need to simulate a real interrupt when invoking
|
|
* the handler() function, which means we need to
|
|
* globally mask the specific IRQ:
|
|
*/
|
|
spin_unlock(&ide_lock);
|
|
hwif = HWIF(drive);
|
|
/* disable_irq_nosync ?? */
|
|
disable_irq(hwif->irq);
|
|
/* local CPU only,
|
|
* as if we were handling an interrupt */
|
|
local_irq_disable();
|
|
if (hwgroup->polling) {
|
|
startstop = handler(drive);
|
|
} else if (drive_is_ready(drive)) {
|
|
if (drive->waiting_for_dma)
|
|
hwgroup->hwif->dma_lost_irq(drive);
|
|
(void)ide_ack_intr(hwif);
|
|
printk(KERN_WARNING "%s: lost interrupt\n", drive->name);
|
|
startstop = handler(drive);
|
|
} else {
|
|
if (drive->waiting_for_dma) {
|
|
startstop = ide_dma_timeout_retry(drive, wait);
|
|
} else
|
|
startstop =
|
|
ide_error(drive, "irq timeout", hwif->INB(IDE_STATUS_REG));
|
|
}
|
|
drive->service_time = jiffies - drive->service_start;
|
|
spin_lock_irq(&ide_lock);
|
|
enable_irq(hwif->irq);
|
|
if (startstop == ide_stopped)
|
|
hwgroup->busy = 0;
|
|
}
|
|
}
|
|
ide_do_request(hwgroup, IDE_NO_IRQ);
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* unexpected_intr - handle an unexpected IDE interrupt
|
|
* @irq: interrupt line
|
|
* @hwgroup: hwgroup being processed
|
|
*
|
|
* There's nothing really useful we can do with an unexpected interrupt,
|
|
* other than reading the status register (to clear it), and logging it.
|
|
* There should be no way that an irq can happen before we're ready for it,
|
|
* so we needn't worry much about losing an "important" interrupt here.
|
|
*
|
|
* On laptops (and "green" PCs), an unexpected interrupt occurs whenever
|
|
* the drive enters "idle", "standby", or "sleep" mode, so if the status
|
|
* looks "good", we just ignore the interrupt completely.
|
|
*
|
|
* This routine assumes __cli() is in effect when called.
|
|
*
|
|
* If an unexpected interrupt happens on irq15 while we are handling irq14
|
|
* and if the two interfaces are "serialized" (CMD640), then it looks like
|
|
* we could screw up by interfering with a new request being set up for
|
|
* irq15.
|
|
*
|
|
* In reality, this is a non-issue. The new command is not sent unless
|
|
* the drive is ready to accept one, in which case we know the drive is
|
|
* not trying to interrupt us. And ide_set_handler() is always invoked
|
|
* before completing the issuance of any new drive command, so we will not
|
|
* be accidentally invoked as a result of any valid command completion
|
|
* interrupt.
|
|
*
|
|
* Note that we must walk the entire hwgroup here. We know which hwif
|
|
* is doing the current command, but we don't know which hwif burped
|
|
* mysteriously.
|
|
*/
|
|
|
|
static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
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{
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u8 stat;
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ide_hwif_t *hwif = hwgroup->hwif;
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|
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/*
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* handle the unexpected interrupt
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|
*/
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do {
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if (hwif->irq == irq) {
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stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
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if (!OK_STAT(stat, READY_STAT, BAD_STAT)) {
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/* Try to not flood the console with msgs */
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static unsigned long last_msgtime, count;
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++count;
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if (time_after(jiffies, last_msgtime + HZ)) {
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last_msgtime = jiffies;
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printk(KERN_ERR "%s%s: unexpected interrupt, "
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"status=0x%02x, count=%ld\n",
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hwif->name,
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(hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count);
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}
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}
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}
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} while ((hwif = hwif->next) != hwgroup->hwif);
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}
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/**
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* ide_intr - default IDE interrupt handler
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* @irq: interrupt number
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* @dev_id: hwif group
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* @regs: unused weirdness from the kernel irq layer
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*
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* This is the default IRQ handler for the IDE layer. You should
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* not need to override it. If you do be aware it is subtle in
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* places
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*
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* hwgroup->hwif is the interface in the group currently performing
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* a command. hwgroup->drive is the drive and hwgroup->handler is
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* the IRQ handler to call. As we issue a command the handlers
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* step through multiple states, reassigning the handler to the
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* next step in the process. Unlike a smart SCSI controller IDE
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* expects the main processor to sequence the various transfer
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* stages. We also manage a poll timer to catch up with most
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* timeout situations. There are still a few where the handlers
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* don't ever decide to give up.
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*
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* The handler eventually returns ide_stopped to indicate the
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* request completed. At this point we issue the next request
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* on the hwgroup and the process begins again.
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*/
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|
|
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irqreturn_t ide_intr (int irq, void *dev_id)
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{
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unsigned long flags;
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ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
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ide_hwif_t *hwif;
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ide_drive_t *drive;
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ide_handler_t *handler;
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ide_startstop_t startstop;
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spin_lock_irqsave(&ide_lock, flags);
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hwif = hwgroup->hwif;
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|
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if (!ide_ack_intr(hwif)) {
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spin_unlock_irqrestore(&ide_lock, flags);
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return IRQ_NONE;
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}
|
|
|
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if ((handler = hwgroup->handler) == NULL || hwgroup->polling) {
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/*
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* Not expecting an interrupt from this drive.
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* That means this could be:
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* (1) an interrupt from another PCI device
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* sharing the same PCI INT# as us.
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* or (2) a drive just entered sleep or standby mode,
|
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* and is interrupting to let us know.
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* or (3) a spurious interrupt of unknown origin.
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*
|
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* For PCI, we cannot tell the difference,
|
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* so in that case we just ignore it and hope it goes away.
|
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*
|
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* FIXME: unexpected_intr should be hwif-> then we can
|
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* remove all the ifdef PCI crap
|
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*/
|
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#ifdef CONFIG_BLK_DEV_IDEPCI
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if (hwif->pci_dev && !hwif->pci_dev->vendor)
|
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#endif /* CONFIG_BLK_DEV_IDEPCI */
|
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{
|
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/*
|
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* Probably not a shared PCI interrupt,
|
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* so we can safely try to do something about it:
|
|
*/
|
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unexpected_intr(irq, hwgroup);
|
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#ifdef CONFIG_BLK_DEV_IDEPCI
|
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} else {
|
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/*
|
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* Whack the status register, just in case
|
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* we have a leftover pending IRQ.
|
|
*/
|
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(void) hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
|
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#endif /* CONFIG_BLK_DEV_IDEPCI */
|
|
}
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
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return IRQ_NONE;
|
|
}
|
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drive = hwgroup->drive;
|
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if (!drive) {
|
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/*
|
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* This should NEVER happen, and there isn't much
|
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* we could do about it here.
|
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*
|
|
* [Note - this can occur if the drive is hot unplugged]
|
|
*/
|
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spin_unlock_irqrestore(&ide_lock, flags);
|
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return IRQ_HANDLED;
|
|
}
|
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if (!drive_is_ready(drive)) {
|
|
/*
|
|
* This happens regularly when we share a PCI IRQ with
|
|
* another device. Unfortunately, it can also happen
|
|
* with some buggy drives that trigger the IRQ before
|
|
* their status register is up to date. Hopefully we have
|
|
* enough advance overhead that the latter isn't a problem.
|
|
*/
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
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return IRQ_NONE;
|
|
}
|
|
if (!hwgroup->busy) {
|
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hwgroup->busy = 1; /* paranoia */
|
|
printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
|
|
}
|
|
hwgroup->handler = NULL;
|
|
hwgroup->req_gen++;
|
|
del_timer(&hwgroup->timer);
|
|
spin_unlock(&ide_lock);
|
|
|
|
/* Some controllers might set DMA INTR no matter DMA or PIO;
|
|
* bmdma status might need to be cleared even for
|
|
* PIO interrupts to prevent spurious/lost irq.
|
|
*/
|
|
if (hwif->ide_dma_clear_irq && !(drive->waiting_for_dma))
|
|
/* ide_dma_end() needs bmdma status for error checking.
|
|
* So, skip clearing bmdma status here and leave it
|
|
* to ide_dma_end() if this is dma interrupt.
|
|
*/
|
|
hwif->ide_dma_clear_irq(drive);
|
|
|
|
if (drive->unmask)
|
|
local_irq_enable_in_hardirq();
|
|
/* service this interrupt, may set handler for next interrupt */
|
|
startstop = handler(drive);
|
|
spin_lock_irq(&ide_lock);
|
|
|
|
/*
|
|
* Note that handler() may have set things up for another
|
|
* interrupt to occur soon, but it cannot happen until
|
|
* we exit from this routine, because it will be the
|
|
* same irq as is currently being serviced here, and Linux
|
|
* won't allow another of the same (on any CPU) until we return.
|
|
*/
|
|
drive->service_time = jiffies - drive->service_start;
|
|
if (startstop == ide_stopped) {
|
|
if (hwgroup->handler == NULL) { /* paranoia */
|
|
hwgroup->busy = 0;
|
|
ide_do_request(hwgroup, hwif->irq);
|
|
} else {
|
|
printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler "
|
|
"on exit\n", drive->name);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* ide_init_drive_cmd - initialize a drive command request
|
|
* @rq: request object
|
|
*
|
|
* Initialize a request before we fill it in and send it down to
|
|
* ide_do_drive_cmd. Commands must be set up by this function. Right
|
|
* now it doesn't do a lot, but if that changes abusers will have a
|
|
* nasty surprise.
|
|
*/
|
|
|
|
void ide_init_drive_cmd (struct request *rq)
|
|
{
|
|
memset(rq, 0, sizeof(*rq));
|
|
rq->ref_count = 1;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ide_init_drive_cmd);
|
|
|
|
/**
|
|
* ide_do_drive_cmd - issue IDE special command
|
|
* @drive: device to issue command
|
|
* @rq: request to issue
|
|
* @action: action for processing
|
|
*
|
|
* This function issues a special IDE device request
|
|
* onto the request queue.
|
|
*
|
|
* If action is ide_wait, then the rq is queued at the end of the
|
|
* request queue, and the function sleeps until it has been processed.
|
|
* This is for use when invoked from an ioctl handler.
|
|
*
|
|
* If action is ide_preempt, then the rq is queued at the head of
|
|
* the request queue, displacing the currently-being-processed
|
|
* request and this function returns immediately without waiting
|
|
* for the new rq to be completed. This is VERY DANGEROUS, and is
|
|
* intended for careful use by the ATAPI tape/cdrom driver code.
|
|
*
|
|
* If action is ide_end, then the rq is queued at the end of the
|
|
* request queue, and the function returns immediately without waiting
|
|
* for the new rq to be completed. This is again intended for careful
|
|
* use by the ATAPI tape/cdrom driver code.
|
|
*/
|
|
|
|
int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
|
|
{
|
|
unsigned long flags;
|
|
ide_hwgroup_t *hwgroup = HWGROUP(drive);
|
|
DECLARE_COMPLETION_ONSTACK(wait);
|
|
int where = ELEVATOR_INSERT_BACK, err;
|
|
int must_wait = (action == ide_wait || action == ide_head_wait);
|
|
|
|
rq->errors = 0;
|
|
|
|
/*
|
|
* we need to hold an extra reference to request for safe inspection
|
|
* after completion
|
|
*/
|
|
if (must_wait) {
|
|
rq->ref_count++;
|
|
rq->end_io_data = &wait;
|
|
rq->end_io = blk_end_sync_rq;
|
|
}
|
|
|
|
spin_lock_irqsave(&ide_lock, flags);
|
|
if (action == ide_preempt)
|
|
hwgroup->rq = NULL;
|
|
if (action == ide_preempt || action == ide_head_wait) {
|
|
where = ELEVATOR_INSERT_FRONT;
|
|
rq->cmd_flags |= REQ_PREEMPT;
|
|
}
|
|
__elv_add_request(drive->queue, rq, where, 0);
|
|
ide_do_request(hwgroup, IDE_NO_IRQ);
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
|
|
err = 0;
|
|
if (must_wait) {
|
|
wait_for_completion(&wait);
|
|
if (rq->errors)
|
|
err = -EIO;
|
|
|
|
blk_put_request(rq);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ide_do_drive_cmd);
|
|
|
|
void ide_pktcmd_tf_load(ide_drive_t *drive, u32 tf_flags, u16 bcount, u8 dma)
|
|
{
|
|
ide_task_t task;
|
|
|
|
memset(&task, 0, sizeof(task));
|
|
task.tf_flags = IDE_TFLAG_OUT_LBAH | IDE_TFLAG_OUT_LBAM |
|
|
IDE_TFLAG_OUT_FEATURE | tf_flags;
|
|
task.tf.feature = dma; /* Use PIO/DMA */
|
|
task.tf.lbam = bcount & 0xff;
|
|
task.tf.lbah = (bcount >> 8) & 0xff;
|
|
|
|
ide_tf_load(drive, &task);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ide_pktcmd_tf_load);
|