1614 lines
46 KiB
C
1614 lines
46 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/config.h>
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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 <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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#include <asm/bitops.h>
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static void ide_fill_flush_cmd(ide_drive_t *drive, struct request *rq)
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{
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char *buf = rq->cmd;
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/*
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* reuse cdb space for ata command
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*/
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memset(buf, 0, sizeof(rq->cmd));
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rq->flags |= REQ_DRIVE_TASK | REQ_STARTED;
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rq->buffer = buf;
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rq->buffer[0] = WIN_FLUSH_CACHE;
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if (ide_id_has_flush_cache_ext(drive->id) &&
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(drive->capacity64 >= (1UL << 28)))
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rq->buffer[0] = WIN_FLUSH_CACHE_EXT;
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}
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/*
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* preempt pending requests, and store this cache flush for immediate
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* execution
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*/
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static struct request *ide_queue_flush_cmd(ide_drive_t *drive,
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struct request *rq, int post)
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{
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struct request *flush_rq = &HWGROUP(drive)->wrq;
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/*
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* write cache disabled, clear the barrier bit and treat it like
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* an ordinary write
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*/
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if (!drive->wcache) {
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rq->flags |= REQ_BAR_PREFLUSH;
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return rq;
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}
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ide_init_drive_cmd(flush_rq);
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ide_fill_flush_cmd(drive, flush_rq);
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flush_rq->special = rq;
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flush_rq->nr_sectors = rq->nr_sectors;
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if (!post) {
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drive->doing_barrier = 1;
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flush_rq->flags |= REQ_BAR_PREFLUSH;
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blkdev_dequeue_request(rq);
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} else
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flush_rq->flags |= REQ_BAR_POSTFLUSH;
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__elv_add_request(drive->queue, flush_rq, ELEVATOR_INSERT_FRONT, 0);
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HWGROUP(drive)->rq = NULL;
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return flush_rq;
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}
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static int __ide_end_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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int ret = 1;
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BUG_ON(!(rq->flags & REQ_STARTED));
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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_sectors = rq->hard_nr_sectors;
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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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HWGROUP(drive)->hwif->ide_dma_on(drive);
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}
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if (!end_that_request_first(rq, uptodate, nr_sectors)) {
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add_disk_randomness(rq->rq_disk);
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if (blk_rq_tagged(rq))
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blk_queue_end_tag(drive->queue, rq);
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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);
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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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struct request *rq;
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unsigned long flags;
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int ret = 1;
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spin_lock_irqsave(&ide_lock, flags);
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rq = HWGROUP(drive)->rq;
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if (!nr_sectors)
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nr_sectors = rq->hard_cur_sectors;
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if (!blk_barrier_rq(rq) || !drive->wcache)
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ret = __ide_end_request(drive, rq, uptodate, nr_sectors);
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else {
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struct request *flush_rq = &HWGROUP(drive)->wrq;
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flush_rq->nr_sectors -= nr_sectors;
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if (!flush_rq->nr_sectors) {
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ide_queue_flush_cmd(drive, rq, 1);
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ret = 0;
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}
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}
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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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* 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);
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spin_unlock_irqrestore(&ide_lock, flags);
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}
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/*
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* FIXME: probably move this somewhere else, name is bad too :)
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*/
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u64 ide_get_error_location(ide_drive_t *drive, char *args)
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{
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u32 high, low;
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u8 hcyl, lcyl, sect;
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u64 sector;
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high = 0;
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hcyl = args[5];
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lcyl = args[4];
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sect = args[3];
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if (ide_id_has_flush_cache_ext(drive->id)) {
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low = (hcyl << 16) | (lcyl << 8) | sect;
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HWIF(drive)->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
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high = ide_read_24(drive);
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} else {
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u8 cur = HWIF(drive)->INB(IDE_SELECT_REG);
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if (cur & 0x40)
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low = (hcyl << 16) | (lcyl << 8) | sect;
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else {
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low = hcyl * drive->head * drive->sect;
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low += lcyl * drive->sect;
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low += sect - 1;
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}
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}
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sector = ((u64) high << 24) | low;
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return sector;
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}
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EXPORT_SYMBOL(ide_get_error_location);
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static void ide_complete_barrier(ide_drive_t *drive, struct request *rq,
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int error)
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{
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struct request *real_rq = rq->special;
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int good_sectors, bad_sectors;
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sector_t sector;
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if (!error) {
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if (blk_barrier_postflush(rq)) {
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/*
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* this completes the barrier write
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*/
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__ide_end_request(drive, real_rq, 1, real_rq->hard_nr_sectors);
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drive->doing_barrier = 0;
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} else {
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/*
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* just indicate that we did the pre flush
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*/
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real_rq->flags |= REQ_BAR_PREFLUSH;
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elv_requeue_request(drive->queue, real_rq);
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}
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/*
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* all is fine, return
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*/
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return;
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}
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/*
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* we need to end real_rq, but it's not on the queue currently.
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* put it back on the queue, so we don't have to special case
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* anything else for completing it
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*/
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if (!blk_barrier_postflush(rq))
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elv_requeue_request(drive->queue, real_rq);
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/*
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* drive aborted flush command, assume FLUSH_CACHE_* doesn't
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* work and disable barrier support
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*/
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if (error & ABRT_ERR) {
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printk(KERN_ERR "%s: barrier support doesn't work\n", drive->name);
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__ide_end_request(drive, real_rq, -EOPNOTSUPP, real_rq->hard_nr_sectors);
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blk_queue_ordered(drive->queue, 0);
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blk_queue_issue_flush_fn(drive->queue, NULL);
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} else {
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/*
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* find out what part of the request failed
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*/
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good_sectors = 0;
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if (blk_barrier_postflush(rq)) {
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sector = ide_get_error_location(drive, rq->buffer);
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if ((sector >= real_rq->hard_sector) &&
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(sector < real_rq->hard_sector + real_rq->hard_nr_sectors))
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good_sectors = sector - real_rq->hard_sector;
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} else
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sector = real_rq->hard_sector;
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bad_sectors = real_rq->hard_nr_sectors - good_sectors;
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if (good_sectors)
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__ide_end_request(drive, real_rq, 1, good_sectors);
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if (bad_sectors)
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__ide_end_request(drive, real_rq, 0, bad_sectors);
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printk(KERN_ERR "%s: failed barrier write: "
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"sector=%Lx(good=%d/bad=%d)\n",
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drive->name, (unsigned long long)sector,
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good_sectors, bad_sectors);
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}
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drive->doing_barrier = 0;
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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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if (rq->flags & REQ_DRIVE_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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args[2] = hwif->INB(IDE_NSECTOR_REG);
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}
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} else if (rq->flags & REQ_DRIVE_TASK) {
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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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args[2] = hwif->INB(IDE_NSECTOR_REG);
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args[3] = hwif->INB(IDE_SECTOR_REG);
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args[4] = hwif->INB(IDE_LCYL_REG);
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args[5] = hwif->INB(IDE_HCYL_REG);
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args[6] = hwif->INB(IDE_SELECT_REG);
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}
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} else if (rq->flags & REQ_DRIVE_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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if (args) {
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if (args->tf_in_flags.b.data) {
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u16 data = hwif->INW(IDE_DATA_REG);
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args->tfRegister[IDE_DATA_OFFSET] = (data) & 0xFF;
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args->hobRegister[IDE_DATA_OFFSET] = (data >> 8) & 0xFF;
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}
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args->tfRegister[IDE_ERROR_OFFSET] = 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->tfRegister[IDE_NSECTOR_OFFSET] = hwif->INB(IDE_NSECTOR_REG);
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args->tfRegister[IDE_SECTOR_OFFSET] = hwif->INB(IDE_SECTOR_REG);
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args->tfRegister[IDE_LCYL_OFFSET] = hwif->INB(IDE_LCYL_REG);
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args->tfRegister[IDE_HCYL_OFFSET] = hwif->INB(IDE_HCYL_REG);
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args->tfRegister[IDE_SELECT_OFFSET] = hwif->INB(IDE_SELECT_REG);
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args->tfRegister[IDE_STATUS_OFFSET] = stat;
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if (drive->addressing == 1) {
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hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
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args->hobRegister[IDE_FEATURE_OFFSET] = hwif->INB(IDE_FEATURE_REG);
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args->hobRegister[IDE_NSECTOR_OFFSET] = hwif->INB(IDE_NSECTOR_REG);
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args->hobRegister[IDE_SECTOR_OFFSET] = hwif->INB(IDE_SECTOR_REG);
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args->hobRegister[IDE_LCYL_OFFSET] = hwif->INB(IDE_LCYL_REG);
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args->hobRegister[IDE_HCYL_OFFSET] = hwif->INB(IDE_HCYL_REG);
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}
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}
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} else if (blk_pm_request(rq)) {
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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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DRIVER(drive)->complete_power_step(drive, rq, stat, err);
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if (rq->pm->pm_step == ide_pm_state_completed)
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ide_complete_pm_request(drive, rq);
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return;
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}
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spin_lock_irqsave(&ide_lock, flags);
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blkdev_dequeue_request(rq);
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if (blk_barrier_preflush(rq) || blk_barrier_postflush(rq))
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ide_complete_barrier(drive, rq, err);
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HWGROUP(drive)->rq = NULL;
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end_that_request_last(rq);
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spin_unlock_irqrestore(&ide_lock, flags);
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}
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EXPORT_SYMBOL(ide_end_drive_cmd);
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/**
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* try_to_flush_leftover_data - flush junk
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* @drive: drive to flush
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*
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* try_to_flush_leftover_data() is invoked in response to a drive
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* unexpectedly having its DRQ_STAT bit set. As an alternative to
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* resetting the drive, this routine tries to clear the condition
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* by read a sector's worth of data from the drive. Of course,
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* this may not help if the drive is *waiting* for data from *us*.
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*/
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void try_to_flush_leftover_data (ide_drive_t *drive)
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{
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int i = (drive->mult_count ? drive->mult_count : 1) * SECTOR_WORDS;
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if (drive->media != ide_disk)
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return;
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while (i > 0) {
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u32 buffer[16];
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u32 wcount = (i > 16) ? 16 : i;
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i -= wcount;
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HWIF(drive)->ata_input_data(drive, buffer, wcount);
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}
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}
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EXPORT_SYMBOL(try_to_flush_leftover_data);
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|
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/*
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* FIXME Add an ATAPI error
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*/
|
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/**
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* ide_error - handle an error on the IDE
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* @drive: drive the error occurred on
|
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* @msg: message to report
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* @stat: status bits
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*
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* ide_error() takes action based on the error returned by the drive.
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* For normal I/O that may well include retries. We deal with
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* both new-style (taskfile) and old style command handling here.
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* In the case of taskfile command handling there is work left to
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* do
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*/
|
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|
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ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, u8 stat)
|
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{
|
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ide_hwif_t *hwif;
|
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struct request *rq;
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u8 err;
|
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|
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err = ide_dump_status(drive, msg, stat);
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if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
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return ide_stopped;
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|
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hwif = HWIF(drive);
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/* retry only "normal" I/O: */
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if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK)) {
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rq->errors = 1;
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ide_end_drive_cmd(drive, stat, err);
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return ide_stopped;
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}
|
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if (rq->flags & REQ_DRIVE_TASKFILE) {
|
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rq->errors = 1;
|
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ide_end_drive_cmd(drive, stat, err);
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return ide_stopped;
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}
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|
|
if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
|
|
/* other bits are useless when BUSY */
|
|
rq->errors |= ERROR_RESET;
|
|
} else {
|
|
if (drive->media != ide_disk)
|
|
goto media_out;
|
|
|
|
if (stat & ERR_STAT) {
|
|
/* err has different meaning on cdrom and tape */
|
|
if (err == ABRT_ERR) {
|
|
if (drive->select.b.lba &&
|
|
(hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY))
|
|
/* some newer drives don't
|
|
* support WIN_SPECIFY
|
|
*/
|
|
return ide_stopped;
|
|
} else if ((err & BAD_CRC) == BAD_CRC) {
|
|
drive->crc_count++;
|
|
/* UDMA crc error -- just retry the operation */
|
|
} 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;
|
|
}
|
|
}
|
|
media_out:
|
|
if ((stat & DRQ_STAT) && rq_data_dir(rq) != WRITE)
|
|
try_to_flush_leftover_data(drive);
|
|
}
|
|
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) {
|
|
DRIVER(drive)->end_request(drive, 0, 0);
|
|
} else {
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* ide_abort - abort pending IDE operatins
|
|
* @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)
|
|
{
|
|
ide_hwif_t *hwif;
|
|
struct request *rq;
|
|
|
|
if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
|
|
return ide_stopped;
|
|
|
|
hwif = HWIF(drive);
|
|
/* retry only "normal" I/O: */
|
|
if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK)) {
|
|
rq->errors = 1;
|
|
ide_end_drive_cmd(drive, BUSY_STAT, 0);
|
|
return ide_stopped;
|
|
}
|
|
if (rq->flags & REQ_DRIVE_TASKFILE) {
|
|
rq->errors = 1;
|
|
ide_end_drive_cmd(drive, BUSY_STAT, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
rq->errors |= ERROR_RESET;
|
|
DRIVER(drive)->end_request(drive, 0, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/**
|
|
* ide_cmd - issue a simple drive command
|
|
* @drive: drive the command is for
|
|
* @cmd: command byte
|
|
* @nsect: sector byte
|
|
* @handler: handler for the command completion
|
|
*
|
|
* Issue a simple drive command with interrupts.
|
|
* The drive must be selected beforehand.
|
|
*/
|
|
|
|
static void ide_cmd (ide_drive_t *drive, u8 cmd, u8 nsect,
|
|
ide_handler_t *handler)
|
|
{
|
|
ide_hwif_t *hwif = HWIF(drive);
|
|
if (IDE_CONTROL_REG)
|
|
hwif->OUTB(drive->ctl,IDE_CONTROL_REG); /* clear nIEN */
|
|
SELECT_MASK(drive,0);
|
|
hwif->OUTB(nsect,IDE_NSECTOR_REG);
|
|
ide_execute_command(drive, cmd, handler, WAIT_CMD, NULL);
|
|
}
|
|
|
|
/**
|
|
* 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 daya 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);
|
|
int retries = 10;
|
|
|
|
local_irq_enable();
|
|
if ((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;
|
|
while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
|
|
udelay(100);
|
|
}
|
|
|
|
if (!OK_STAT(stat, READY_STAT, BAD_STAT) && DRIVER(drive) != NULL)
|
|
return DRIVER(drive)->error(drive, "drive_cmd", stat);
|
|
/* calls ide_end_drive_cmd */
|
|
ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
|
|
return ide_stopped;
|
|
}
|
|
|
|
/**
|
|
* 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) {
|
|
s->b.set_tune = 0;
|
|
if (HWIF(drive)->tuneproc != NULL)
|
|
HWIF(drive)->tuneproc(drive, drive->tune_req);
|
|
return ide_stopped;
|
|
}
|
|
else
|
|
return DRIVER(drive)->special(drive);
|
|
}
|
|
|
|
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->flags & REQ_DRIVE_TASKFILE) == 0) {
|
|
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 = hwif->cursg_ofs = 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
|
|
|
|
/**
|
|
* execute_drive_command - issue special drive command
|
|
* @drive: the drive to issue th 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);
|
|
if (rq->flags & REQ_DRIVE_TASKFILE) {
|
|
ide_task_t *args = rq->special;
|
|
|
|
if (!args)
|
|
goto done;
|
|
|
|
hwif->data_phase = args->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;
|
|
}
|
|
|
|
if (args->tf_out_flags.all != 0)
|
|
return flagged_taskfile(drive, args);
|
|
return do_rw_taskfile(drive, args);
|
|
} else if (rq->flags & REQ_DRIVE_TASK) {
|
|
u8 *args = rq->buffer;
|
|
u8 sel;
|
|
|
|
if (!args)
|
|
goto done;
|
|
#ifdef DEBUG
|
|
printk("%s: DRIVE_TASK_CMD ", drive->name);
|
|
printk("cmd=0x%02x ", args[0]);
|
|
printk("fr=0x%02x ", args[1]);
|
|
printk("ns=0x%02x ", args[2]);
|
|
printk("sc=0x%02x ", args[3]);
|
|
printk("lcyl=0x%02x ", args[4]);
|
|
printk("hcyl=0x%02x ", args[5]);
|
|
printk("sel=0x%02x\n", args[6]);
|
|
#endif
|
|
hwif->OUTB(args[1], IDE_FEATURE_REG);
|
|
hwif->OUTB(args[3], IDE_SECTOR_REG);
|
|
hwif->OUTB(args[4], IDE_LCYL_REG);
|
|
hwif->OUTB(args[5], IDE_HCYL_REG);
|
|
sel = (args[6] & ~0x10);
|
|
if (drive->select.b.unit)
|
|
sel |= 0x10;
|
|
hwif->OUTB(sel, IDE_SELECT_REG);
|
|
ide_cmd(drive, args[0], args[2], &drive_cmd_intr);
|
|
return ide_started;
|
|
} else if (rq->flags & REQ_DRIVE_CMD) {
|
|
u8 *args = rq->buffer;
|
|
|
|
if (!args)
|
|
goto done;
|
|
#ifdef DEBUG
|
|
printk("%s: DRIVE_CMD ", drive->name);
|
|
printk("cmd=0x%02x ", args[0]);
|
|
printk("sc=0x%02x ", args[1]);
|
|
printk("fr=0x%02x ", args[2]);
|
|
printk("xx=0x%02x\n", args[3]);
|
|
#endif
|
|
if (args[0] == WIN_SMART) {
|
|
hwif->OUTB(0x4f, IDE_LCYL_REG);
|
|
hwif->OUTB(0xc2, IDE_HCYL_REG);
|
|
hwif->OUTB(args[2],IDE_FEATURE_REG);
|
|
hwif->OUTB(args[1],IDE_SECTOR_REG);
|
|
ide_cmd(drive, args[0], args[3], &drive_cmd_intr);
|
|
return ide_started;
|
|
}
|
|
hwif->OUTB(args[2],IDE_FEATURE_REG);
|
|
ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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(!(rq->flags & REQ_STARTED));
|
|
|
|
#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)) {
|
|
goto kill_rq;
|
|
}
|
|
|
|
/*
|
|
* bail early if we've sent a device to sleep, however how to wake
|
|
* this needs to be a masked flag. FIXME for proper operations.
|
|
*/
|
|
if (drive->suspend_reset)
|
|
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_suspend_request(rq) &&
|
|
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) &&
|
|
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);
|
|
HWIF(drive)->OUTB(8, HWIF(drive)->io_ports[IDE_CONTROL_OFFSET]);
|
|
rc = ide_wait_not_busy(HWIF(drive), 10000);
|
|
if (rc)
|
|
printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
|
|
}
|
|
|
|
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) {
|
|
if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK))
|
|
return execute_drive_cmd(drive, rq);
|
|
else if (rq->flags & REQ_DRIVE_TASKFILE)
|
|
return execute_drive_cmd(drive, rq);
|
|
else if (blk_pm_request(rq)) {
|
|
#ifdef DEBUG_PM
|
|
printk("%s: start_power_step(step: %d)\n",
|
|
drive->name, rq->pm->pm_step);
|
|
#endif
|
|
startstop = DRIVER(drive)->start_power_step(drive, rq);
|
|
if (startstop == ide_stopped &&
|
|
rq->pm->pm_step == ide_pm_state_completed)
|
|
ide_complete_pm_request(drive, rq);
|
|
return startstop;
|
|
}
|
|
return (DRIVER(drive)->do_request(drive, rq, block));
|
|
}
|
|
return do_special(drive);
|
|
kill_rq:
|
|
DRIVER(drive)->end_request(drive, 0, 0);
|
|
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;
|
|
}
|
|
|
|
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 (drive->doing_barrier) {
|
|
/*
|
|
* 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->sleep || time_after_eq(jiffies, drive->sleep))
|
|
&& !elv_queue_empty(drive->queue)) {
|
|
if (!best
|
|
|| (drive->sleep && (!best->sleep || 0 < (signed long)(best->sleep - drive->sleep)))
|
|
|| (!best->sleep && 0 < (signed long)(WAKEUP(best) - WAKEUP(drive))))
|
|
{
|
|
if (!blk_queue_plugged(drive->queue))
|
|
best = drive;
|
|
}
|
|
}
|
|
} while ((drive = drive->next) != hwgroup->drive);
|
|
if (best && best->nice1 && !best->sleep && 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->sleep
|
|
/* FIXME: use time_before */
|
|
&& 0 < (signed long)(WAKEUP(drive) - (jiffies - best->service_time))
|
|
&& 0 < (signed long)((jiffies + t) - WAKEUP(drive)))
|
|
{
|
|
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;
|
|
|
|
/* 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) {
|
|
unsigned long sleep = 0;
|
|
hwgroup->rq = NULL;
|
|
drive = hwgroup->drive;
|
|
do {
|
|
if (drive->sleep && (!sleep || 0 < (signed long)(sleep - drive->sleep)))
|
|
sleep = drive->sleep;
|
|
} while ((drive = drive->next) != hwgroup->drive);
|
|
if (sleep) {
|
|
/*
|
|
* 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;
|
|
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;
|
|
}
|
|
hwif = HWIF(drive);
|
|
if (hwgroup->hwif->sharing_irq &&
|
|
hwif != hwgroup->hwif &&
|
|
hwif->io_ports[IDE_CONTROL_OFFSET]) {
|
|
/* set nIEN for previous hwif */
|
|
SELECT_INTERRUPT(drive);
|
|
}
|
|
hwgroup->hwif = hwif;
|
|
hwgroup->drive = drive;
|
|
drive->sleep = 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;
|
|
}
|
|
|
|
/*
|
|
* if rq is a barrier write, issue pre cache flush if not
|
|
* already done
|
|
*/
|
|
if (blk_barrier_rq(rq) && !blk_barrier_preflush(rq))
|
|
rq = ide_queue_flush_cmd(drive, rq, 0);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (drive->blocked && !blk_pm_request(rq) && !(rq->flags & REQ_PREEMPT)) {
|
|
/* 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 (hwif->irq != masked_irq)
|
|
disable_irq_nosync(hwif->irq);
|
|
spin_unlock(&ide_lock);
|
|
local_irq_enable();
|
|
/* allow other IRQs while we start this request */
|
|
startstop = start_request(drive, rq);
|
|
spin_lock_irq(&ide_lock);
|
|
if (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(request_queue_t *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 = DRIVER(drive)->error(drive, "dma timeout error",
|
|
hwif->INB(IDE_STATUS_REG));
|
|
} else {
|
|
printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name);
|
|
(void) hwif->ide_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;
|
|
(void) hwif->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;
|
|
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 = NULL;
|
|
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) {
|
|
/*
|
|
* 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;
|
|
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);
|
|
#if DISABLE_IRQ_NOSYNC
|
|
disable_irq_nosync(hwif->irq);
|
|
#else
|
|
/* disable_irq_nosync ?? */
|
|
disable_irq(hwif->irq);
|
|
#endif /* DISABLE_IRQ_NOSYNC */
|
|
/* local CPU only,
|
|
* as if we were handling an interrupt */
|
|
local_irq_disable();
|
|
if (hwgroup->poll_timeout != 0) {
|
|
startstop = handler(drive);
|
|
} else if (drive_is_ready(drive)) {
|
|
if (drive->waiting_for_dma)
|
|
(void) hwgroup->hwif->ide_dma_lostirq(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 =
|
|
DRIVER(drive)->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)
|
|
{
|
|
u8 stat;
|
|
ide_hwif_t *hwif = hwgroup->hwif;
|
|
|
|
/*
|
|
* handle the unexpected interrupt
|
|
*/
|
|
do {
|
|
if (hwif->irq == irq) {
|
|
stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
|
|
if (!OK_STAT(stat, READY_STAT, BAD_STAT)) {
|
|
/* Try to not flood the console with msgs */
|
|
static unsigned long last_msgtime, count;
|
|
++count;
|
|
if (time_after(jiffies, last_msgtime + HZ)) {
|
|
last_msgtime = jiffies;
|
|
printk(KERN_ERR "%s%s: unexpected interrupt, "
|
|
"status=0x%02x, count=%ld\n",
|
|
hwif->name,
|
|
(hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count);
|
|
}
|
|
}
|
|
}
|
|
} while ((hwif = hwif->next) != hwgroup->hwif);
|
|
}
|
|
|
|
/**
|
|
* ide_intr - default IDE interrupt handler
|
|
* @irq: interrupt number
|
|
* @dev_id: hwif group
|
|
* @regs: unused weirdness from the kernel irq layer
|
|
*
|
|
* This is the default IRQ handler for the IDE layer. You should
|
|
* not need to override it. If you do be aware it is subtle in
|
|
* places
|
|
*
|
|
* hwgroup->hwif is the interface in the group currently performing
|
|
* a command. hwgroup->drive is the drive and hwgroup->handler is
|
|
* the IRQ handler to call. As we issue a command the handlers
|
|
* step through multiple states, reassigning the handler to the
|
|
* next step in the process. Unlike a smart SCSI controller IDE
|
|
* expects the main processor to sequence the various transfer
|
|
* stages. We also manage a poll timer to catch up with most
|
|
* timeout situations. There are still a few where the handlers
|
|
* don't ever decide to give up.
|
|
*
|
|
* The handler eventually returns ide_stopped to indicate the
|
|
* request completed. At this point we issue the next request
|
|
* on the hwgroup and the process begins again.
|
|
*/
|
|
|
|
irqreturn_t ide_intr (int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
unsigned long flags;
|
|
ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
|
|
ide_hwif_t *hwif;
|
|
ide_drive_t *drive;
|
|
ide_handler_t *handler;
|
|
ide_startstop_t startstop;
|
|
|
|
spin_lock_irqsave(&ide_lock, flags);
|
|
hwif = hwgroup->hwif;
|
|
|
|
if (!ide_ack_intr(hwif)) {
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
if ((handler = hwgroup->handler) == NULL ||
|
|
hwgroup->poll_timeout != 0) {
|
|
/*
|
|
* Not expecting an interrupt from this drive.
|
|
* That means this could be:
|
|
* (1) an interrupt from another PCI device
|
|
* sharing the same PCI INT# as us.
|
|
* or (2) a drive just entered sleep or standby mode,
|
|
* and is interrupting to let us know.
|
|
* or (3) a spurious interrupt of unknown origin.
|
|
*
|
|
* For PCI, we cannot tell the difference,
|
|
* so in that case we just ignore it and hope it goes away.
|
|
*
|
|
* FIXME: unexpected_intr should be hwif-> then we can
|
|
* remove all the ifdef PCI crap
|
|
*/
|
|
#ifdef CONFIG_BLK_DEV_IDEPCI
|
|
if (hwif->pci_dev && !hwif->pci_dev->vendor)
|
|
#endif /* CONFIG_BLK_DEV_IDEPCI */
|
|
{
|
|
/*
|
|
* Probably not a shared PCI interrupt,
|
|
* so we can safely try to do something about it:
|
|
*/
|
|
unexpected_intr(irq, hwgroup);
|
|
#ifdef CONFIG_BLK_DEV_IDEPCI
|
|
} else {
|
|
/*
|
|
* Whack the status register, just in case
|
|
* we have a leftover pending IRQ.
|
|
*/
|
|
(void) hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
|
|
#endif /* CONFIG_BLK_DEV_IDEPCI */
|
|
}
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
return IRQ_NONE;
|
|
}
|
|
drive = hwgroup->drive;
|
|
if (!drive) {
|
|
/*
|
|
* This should NEVER happen, and there isn't much
|
|
* we could do about it here.
|
|
*
|
|
* [Note - this can occur if the drive is hot unplugged]
|
|
*/
|
|
spin_unlock_irqrestore(&ide_lock, flags);
|
|
return IRQ_HANDLED;
|
|
}
|
|
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);
|
|
return IRQ_NONE;
|
|
}
|
|
if (!hwgroup->busy) {
|
|
hwgroup->busy = 1; /* paranoia */
|
|
printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
|
|
}
|
|
hwgroup->handler = NULL;
|
|
del_timer(&hwgroup->timer);
|
|
spin_unlock(&ide_lock);
|
|
|
|
if (drive->unmask)
|
|
local_irq_enable();
|
|
/* 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 suprise.
|
|
*/
|
|
|
|
void ide_init_drive_cmd (struct request *rq)
|
|
{
|
|
memset(rq, 0, sizeof(*rq));
|
|
rq->flags = REQ_DRIVE_CMD;
|
|
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_next, then the rq is queued immediately after
|
|
* the currently-being-processed-request (if any), and the function
|
|
* returns without waiting for the new rq to be completed. As above,
|
|
* 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(wait);
|
|
int where = ELEVATOR_INSERT_BACK, err;
|
|
int must_wait = (action == ide_wait || action == ide_head_wait);
|
|
|
|
rq->errors = 0;
|
|
rq->rq_status = RQ_ACTIVE;
|
|
|
|
rq->rq_disk = drive->disk;
|
|
|
|
/*
|
|
* we need to hold an extra reference to request for safe inspection
|
|
* after completion
|
|
*/
|
|
if (must_wait) {
|
|
rq->ref_count++;
|
|
rq->waiting = &wait;
|
|
}
|
|
|
|
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->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);
|
|
rq->waiting = NULL;
|
|
if (rq->errors)
|
|
err = -EIO;
|
|
|
|
blk_put_request(rq);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ide_do_drive_cmd);
|