1 |
1275 |
phoenix |
/*
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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/devfs_fs_kernel.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/kmod.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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#include "ide_modes.h"
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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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*
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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.
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*/
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int ide_end_request (ide_drive_t *drive, int uptodate)
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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(&io_request_lock, flags);
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rq = HWGROUP(drive)->rq;
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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, drive->name)) {
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add_blkdev_randomness(MAJOR(rq->rq_dev));
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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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spin_unlock_irqrestore(&io_request_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_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(&io_request_lock, flags);
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rq = HWGROUP(drive)->rq;
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spin_unlock_irqrestore(&io_request_lock, flags);
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switch(rq->cmd) {
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case IDE_DRIVE_CMD:
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{
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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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break;
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}
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case IDE_DRIVE_TASK:
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{
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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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break;
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}
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case IDE_DRIVE_TASKFILE:
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{
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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_HOB] = (data >> 8) & 0xFF;
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}
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args->tfRegister[IDE_ERROR_OFFSET] = err;
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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_HOB);
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args->hobRegister[IDE_FEATURE_OFFSET_HOB] = hwif->INB(IDE_FEATURE_REG);
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args->hobRegister[IDE_NSECTOR_OFFSET_HOB] = hwif->INB(IDE_NSECTOR_REG);
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args->hobRegister[IDE_SECTOR_OFFSET_HOB] = hwif->INB(IDE_SECTOR_REG);
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args->hobRegister[IDE_LCYL_OFFSET_HOB] = hwif->INB(IDE_LCYL_REG);
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args->hobRegister[IDE_HCYL_OFFSET_HOB] = hwif->INB(IDE_HCYL_REG);
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}
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}
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break;
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}
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default:
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break;
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}
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spin_lock_irqsave(&io_request_lock, flags);
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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(&io_request_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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* 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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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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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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hwif = HWIF(drive);
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/* retry only "normal" I/O: */
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if (rq->cmd == IDE_DRIVE_CMD || rq->cmd == IDE_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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260 |
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if (rq->cmd == IDE_DRIVE_TASKFILE) {
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rq->errors = 1;
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ide_end_drive_cmd(drive, stat, err);
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// ide_end_taskfile(drive, stat, err);
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return ide_stopped;
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}
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266 |
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267 |
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if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
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/* other bits are useless when BUSY */
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rq->errors |= ERROR_RESET;
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} else {
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if (drive->media != ide_disk)
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goto media_out;
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273 |
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274 |
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if (stat & ERR_STAT) {
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275 |
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/* err has different meaning on cdrom and tape */
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276 |
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if (err == ABRT_ERR) {
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if (drive->select.b.lba &&
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(hwif->INB(IDE_COMMAND_REG) == WIN_SPECIFY))
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/* some newer drives don't
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* support WIN_SPECIFY
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281 |
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*/
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return ide_stopped;
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283 |
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} else if ((err & BAD_CRC) == BAD_CRC) {
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284 |
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drive->crc_count++;
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285 |
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/* UDMA crc error -- just retry the operation */
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286 |
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} else if (err & (BBD_ERR | ECC_ERR)) {
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287 |
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/* retries won't help these */
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288 |
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rq->errors = ERROR_MAX;
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289 |
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} else if (err & TRK0_ERR) {
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290 |
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/* help it find track zero */
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291 |
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rq->errors |= ERROR_RECAL;
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292 |
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}
|
293 |
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}
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294 |
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media_out:
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295 |
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if ((stat & DRQ_STAT) && rq->cmd != WRITE)
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296 |
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try_to_flush_leftover_data(drive);
|
297 |
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}
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298 |
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if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) {
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299 |
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/* force an abort */
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300 |
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hwif->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
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301 |
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}
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302 |
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if (rq->errors >= ERROR_MAX) {
|
303 |
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DRIVER(drive)->end_request(drive, 0);
|
304 |
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} else {
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305 |
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if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
|
306 |
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++rq->errors;
|
307 |
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return ide_do_reset(drive);
|
308 |
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}
|
309 |
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if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
|
310 |
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drive->special.b.recalibrate = 1;
|
311 |
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++rq->errors;
|
312 |
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}
|
313 |
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return ide_stopped;
|
314 |
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}
|
315 |
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|
316 |
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EXPORT_SYMBOL(ide_error);
|
317 |
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|
318 |
|
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/**
|
319 |
|
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* ide_abort - abort pending IDE operatins
|
320 |
|
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* @drive: drive the error occurred on
|
321 |
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* @msg: message to report
|
322 |
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*
|
323 |
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* ide_abort kills and cleans up when we are about to do a
|
324 |
|
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* host initiated reset on active commands. Longer term we
|
325 |
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* want handlers to have sensible abort handling themselves
|
326 |
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*
|
327 |
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* This differs fundamentally from ide_error because in
|
328 |
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* this case the command is doing just fine when we
|
329 |
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* blow it away.
|
330 |
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*/
|
331 |
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|
332 |
|
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ide_startstop_t ide_abort(ide_drive_t *drive, const char *msg)
|
333 |
|
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{
|
334 |
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ide_hwif_t *hwif;
|
335 |
|
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struct request *rq;
|
336 |
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|
337 |
|
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if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
|
338 |
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return ide_stopped;
|
339 |
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|
340 |
|
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hwif = HWIF(drive);
|
341 |
|
|
/* retry only "normal" I/O: */
|
342 |
|
|
if (rq->cmd == IDE_DRIVE_CMD || rq->cmd == IDE_DRIVE_TASK) {
|
343 |
|
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rq->errors = 1;
|
344 |
|
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ide_end_drive_cmd(drive, BUSY_STAT, 0);
|
345 |
|
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return ide_stopped;
|
346 |
|
|
}
|
347 |
|
|
if (rq->cmd == IDE_DRIVE_TASKFILE) {
|
348 |
|
|
rq->errors = 1;
|
349 |
|
|
ide_end_drive_cmd(drive, BUSY_STAT, 0);
|
350 |
|
|
// ide_end_taskfile(drive, BUSY_STAT, 0);
|
351 |
|
|
return ide_stopped;
|
352 |
|
|
}
|
353 |
|
|
|
354 |
|
|
rq->errors |= ERROR_RESET;
|
355 |
|
|
DRIVER(drive)->end_request(drive, 0);
|
356 |
|
|
return ide_stopped;
|
357 |
|
|
}
|
358 |
|
|
|
359 |
|
|
EXPORT_SYMBOL(ide_abort);
|
360 |
|
|
|
361 |
|
|
/**
|
362 |
|
|
* ide_cmd - issue a simple drive command
|
363 |
|
|
* @drive: drive the command is for
|
364 |
|
|
* @cmd: command byte
|
365 |
|
|
* @nsect: sector byte
|
366 |
|
|
* @handler: handler for the command completion
|
367 |
|
|
*
|
368 |
|
|
* Issue a simple drive command with interrupts.
|
369 |
|
|
* The drive must be selected beforehand.
|
370 |
|
|
*/
|
371 |
|
|
|
372 |
|
|
void ide_cmd (ide_drive_t *drive, u8 cmd, u8 nsect, ide_handler_t *handler)
|
373 |
|
|
{
|
374 |
|
|
ide_hwif_t *hwif = HWIF(drive);
|
375 |
|
|
if (IDE_CONTROL_REG)
|
376 |
|
|
hwif->OUTB(drive->ctl,IDE_CONTROL_REG); /* clear nIEN */
|
377 |
|
|
SELECT_MASK(drive,0);
|
378 |
|
|
hwif->OUTB(nsect,IDE_NSECTOR_REG);
|
379 |
|
|
ide_execute_command(drive, cmd, handler, WAIT_CMD, NULL);
|
380 |
|
|
}
|
381 |
|
|
|
382 |
|
|
EXPORT_SYMBOL(ide_cmd);
|
383 |
|
|
|
384 |
|
|
/**
|
385 |
|
|
* drive_cmd_intr - drive command completion interrupt
|
386 |
|
|
* @drive: drive the completion interrupt occurred on
|
387 |
|
|
*
|
388 |
|
|
* drive_cmd_intr() is invoked on completion of a special DRIVE_CMD.
|
389 |
|
|
* We do any neccessary daya reading and then wait for the drive to
|
390 |
|
|
* go non busy. At that point we may read the error data and complete
|
391 |
|
|
* the request
|
392 |
|
|
*/
|
393 |
|
|
|
394 |
|
|
ide_startstop_t drive_cmd_intr (ide_drive_t *drive)
|
395 |
|
|
{
|
396 |
|
|
struct request *rq = HWGROUP(drive)->rq;
|
397 |
|
|
ide_hwif_t *hwif = HWIF(drive);
|
398 |
|
|
u8 *args = (u8 *) rq->buffer;
|
399 |
|
|
u8 stat = hwif->INB(IDE_STATUS_REG);
|
400 |
|
|
int retries = 10;
|
401 |
|
|
|
402 |
|
|
local_irq_enable();
|
403 |
|
|
if ((stat & DRQ_STAT) && args && args[3]) {
|
404 |
|
|
u8 io_32bit = drive->io_32bit;
|
405 |
|
|
drive->io_32bit = 0;
|
406 |
|
|
hwif->ata_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
|
407 |
|
|
drive->io_32bit = io_32bit;
|
408 |
|
|
while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
|
409 |
|
|
udelay(100);
|
410 |
|
|
}
|
411 |
|
|
|
412 |
|
|
if (!OK_STAT(stat, READY_STAT, BAD_STAT))
|
413 |
|
|
return DRIVER(drive)->error(drive, "drive_cmd", stat);
|
414 |
|
|
/* calls ide_end_drive_cmd */
|
415 |
|
|
ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
|
416 |
|
|
return ide_stopped;
|
417 |
|
|
}
|
418 |
|
|
|
419 |
|
|
EXPORT_SYMBOL(drive_cmd_intr);
|
420 |
|
|
|
421 |
|
|
/**
|
422 |
|
|
* do_special - issue some special commands
|
423 |
|
|
* @drive: drive the command is for
|
424 |
|
|
*
|
425 |
|
|
* do_special() is used to issue WIN_SPECIFY, WIN_RESTORE, and WIN_SETMULT
|
426 |
|
|
* commands to a drive. It used to do much more, but has been scaled
|
427 |
|
|
* back.
|
428 |
|
|
*/
|
429 |
|
|
|
430 |
|
|
ide_startstop_t do_special (ide_drive_t *drive)
|
431 |
|
|
{
|
432 |
|
|
special_t *s = &drive->special;
|
433 |
|
|
|
434 |
|
|
#ifdef DEBUG
|
435 |
|
|
printk("%s: do_special: 0x%02x\n", drive->name, s->all);
|
436 |
|
|
#endif
|
437 |
|
|
if (s->b.set_tune) {
|
438 |
|
|
s->b.set_tune = 0;
|
439 |
|
|
if (HWIF(drive)->tuneproc != NULL)
|
440 |
|
|
HWIF(drive)->tuneproc(drive, drive->tune_req);
|
441 |
|
|
return ide_stopped;
|
442 |
|
|
}
|
443 |
|
|
else
|
444 |
|
|
return DRIVER(drive)->special(drive);
|
445 |
|
|
}
|
446 |
|
|
|
447 |
|
|
EXPORT_SYMBOL(do_special);
|
448 |
|
|
|
449 |
|
|
/**
|
450 |
|
|
* execute_drive_command - issue special drive command
|
451 |
|
|
* @drive: the drive to issue th command on
|
452 |
|
|
* @rq: the request structure holding the command
|
453 |
|
|
*
|
454 |
|
|
* execute_drive_cmd() issues a special drive command, usually
|
455 |
|
|
* initiated by ioctl() from the external hdparm program. The
|
456 |
|
|
* command can be a drive command, drive task or taskfile
|
457 |
|
|
* operation. Weirdly you can call it with NULL to wait for
|
458 |
|
|
* all commands to finish. Don't do this as that is due to change
|
459 |
|
|
*/
|
460 |
|
|
|
461 |
|
|
ide_startstop_t execute_drive_cmd (ide_drive_t *drive, struct request *rq)
|
462 |
|
|
{
|
463 |
|
|
ide_hwif_t *hwif = HWIF(drive);
|
464 |
|
|
switch(rq->cmd) {
|
465 |
|
|
case IDE_DRIVE_TASKFILE:
|
466 |
|
|
{
|
467 |
|
|
ide_task_t *args = rq->special;
|
468 |
|
|
|
469 |
|
|
if (!(args)) break;
|
470 |
|
|
|
471 |
|
|
if (args->tf_out_flags.all != 0)
|
472 |
|
|
return flagged_taskfile(drive, args);
|
473 |
|
|
return do_rw_taskfile(drive, args);
|
474 |
|
|
}
|
475 |
|
|
case IDE_DRIVE_TASK:
|
476 |
|
|
{
|
477 |
|
|
u8 *args = rq->buffer;
|
478 |
|
|
u8 sel;
|
479 |
|
|
|
480 |
|
|
if (!(args)) break;
|
481 |
|
|
#ifdef DEBUG
|
482 |
|
|
printk("%s: DRIVE_TASK_CMD ", drive->name);
|
483 |
|
|
printk("cmd=0x%02x ", args[0]);
|
484 |
|
|
printk("fr=0x%02x ", args[1]);
|
485 |
|
|
printk("ns=0x%02x ", args[2]);
|
486 |
|
|
printk("sc=0x%02x ", args[3]);
|
487 |
|
|
printk("lcyl=0x%02x ", args[4]);
|
488 |
|
|
printk("hcyl=0x%02x ", args[5]);
|
489 |
|
|
printk("sel=0x%02x\n", args[6]);
|
490 |
|
|
#endif
|
491 |
|
|
hwif->OUTB(args[1], IDE_FEATURE_REG);
|
492 |
|
|
hwif->OUTB(args[3], IDE_SECTOR_REG);
|
493 |
|
|
hwif->OUTB(args[4], IDE_LCYL_REG);
|
494 |
|
|
hwif->OUTB(args[5], IDE_HCYL_REG);
|
495 |
|
|
sel = (args[6] & ~0x10);
|
496 |
|
|
if (drive->select.b.unit)
|
497 |
|
|
sel |= 0x10;
|
498 |
|
|
hwif->OUTB(sel, IDE_SELECT_REG);
|
499 |
|
|
ide_cmd(drive, args[0], args[2], &drive_cmd_intr);
|
500 |
|
|
return ide_started;
|
501 |
|
|
}
|
502 |
|
|
case IDE_DRIVE_CMD:
|
503 |
|
|
{
|
504 |
|
|
u8 *args = rq->buffer;
|
505 |
|
|
|
506 |
|
|
if (!(args)) break;
|
507 |
|
|
#ifdef DEBUG
|
508 |
|
|
printk("%s: DRIVE_CMD ", drive->name);
|
509 |
|
|
printk("cmd=0x%02x ", args[0]);
|
510 |
|
|
printk("sc=0x%02x ", args[1]);
|
511 |
|
|
printk("fr=0x%02x ", args[2]);
|
512 |
|
|
printk("xx=0x%02x\n", args[3]);
|
513 |
|
|
#endif
|
514 |
|
|
if (args[0] == WIN_SMART) {
|
515 |
|
|
hwif->OUTB(0x4f, IDE_LCYL_REG);
|
516 |
|
|
hwif->OUTB(0xc2, IDE_HCYL_REG);
|
517 |
|
|
hwif->OUTB(args[2],IDE_FEATURE_REG);
|
518 |
|
|
hwif->OUTB(args[1],IDE_SECTOR_REG);
|
519 |
|
|
ide_cmd(drive, args[0], args[3], &drive_cmd_intr);
|
520 |
|
|
return ide_started;
|
521 |
|
|
}
|
522 |
|
|
hwif->OUTB(args[2],IDE_FEATURE_REG);
|
523 |
|
|
ide_cmd(drive, args[0], args[1], &drive_cmd_intr);
|
524 |
|
|
return ide_started;
|
525 |
|
|
}
|
526 |
|
|
default:
|
527 |
|
|
break;
|
528 |
|
|
}
|
529 |
|
|
/*
|
530 |
|
|
* NULL is actually a valid way of waiting for
|
531 |
|
|
* all current requests to be flushed from the queue.
|
532 |
|
|
*/
|
533 |
|
|
#ifdef DEBUG
|
534 |
|
|
printk("%s: DRIVE_CMD (null)\n", drive->name);
|
535 |
|
|
#endif
|
536 |
|
|
ide_end_drive_cmd(drive,
|
537 |
|
|
hwif->INB(IDE_STATUS_REG),
|
538 |
|
|
hwif->INB(IDE_ERROR_REG));
|
539 |
|
|
return ide_stopped;
|
540 |
|
|
}
|
541 |
|
|
|
542 |
|
|
EXPORT_SYMBOL(execute_drive_cmd);
|
543 |
|
|
|
544 |
|
|
/**
|
545 |
|
|
* ide_start_request - start of I/O and command issuing for IDE
|
546 |
|
|
*
|
547 |
|
|
* ide_start_request() initiates handling of a new I/O request. It
|
548 |
|
|
* accepts commands and I/O (read/write) requests. It also does
|
549 |
|
|
* the final remapping for weird stuff like EZDrive. Once
|
550 |
|
|
* device mapper can work sector level the EZDrive stuff can go away
|
551 |
|
|
*
|
552 |
|
|
* FIXME: this function needs a rename
|
553 |
|
|
*/
|
554 |
|
|
|
555 |
|
|
static ide_startstop_t ide_start_request (ide_drive_t *drive, struct request *rq)
|
556 |
|
|
{
|
557 |
|
|
ide_startstop_t startstop;
|
558 |
|
|
unsigned long block, blockend;
|
559 |
|
|
unsigned int minor = MINOR(rq->rq_dev), unit = minor >> PARTN_BITS;
|
560 |
|
|
ide_hwif_t *hwif = HWIF(drive);
|
561 |
|
|
|
562 |
|
|
#ifdef DEBUG
|
563 |
|
|
printk("%s: ide_start_request: current=0x%08lx\n",
|
564 |
|
|
hwif->name, (unsigned long) rq);
|
565 |
|
|
#endif
|
566 |
|
|
|
567 |
|
|
/* bail early if we've exceeded max_failures */
|
568 |
|
|
if (!drive->present || (drive->max_failures && (drive->failures > drive->max_failures))) {
|
569 |
|
|
goto kill_rq;
|
570 |
|
|
}
|
571 |
|
|
|
572 |
|
|
/*
|
573 |
|
|
* bail early if we've sent a device to sleep, however how to wake
|
574 |
|
|
* this needs to be a masked flag. FIXME for proper operations.
|
575 |
|
|
*/
|
576 |
|
|
if (drive->suspend_reset) {
|
577 |
|
|
goto kill_rq;
|
578 |
|
|
}
|
579 |
|
|
|
580 |
|
|
if (unit >= MAX_DRIVES) {
|
581 |
|
|
printk(KERN_ERR "%s: bad device number: %s\n",
|
582 |
|
|
hwif->name, kdevname(rq->rq_dev));
|
583 |
|
|
goto kill_rq;
|
584 |
|
|
}
|
585 |
|
|
#ifdef DEBUG
|
586 |
|
|
if (rq->bh && !buffer_locked(rq->bh)) {
|
587 |
|
|
printk(KERN_ERR "%s: block not locked\n", drive->name);
|
588 |
|
|
goto kill_rq;
|
589 |
|
|
}
|
590 |
|
|
#endif
|
591 |
|
|
block = rq->sector;
|
592 |
|
|
blockend = block + rq->nr_sectors;
|
593 |
|
|
|
594 |
|
|
if (blk_fs_request(rq) &&
|
595 |
|
|
(drive->media == ide_disk || drive->media == ide_floppy)) {
|
596 |
|
|
if ((blockend < block) || (blockend > drive->part[minor&PARTN_MASK].nr_sects)) {
|
597 |
|
|
printk(KERN_ERR "%s%c: bad access: block=%ld, count=%ld\n", drive->name,
|
598 |
|
|
(minor&PARTN_MASK)?'0'+(minor&PARTN_MASK):' ', block, rq->nr_sectors);
|
599 |
|
|
goto kill_rq;
|
600 |
|
|
}
|
601 |
|
|
block += drive->part[minor&PARTN_MASK].start_sect + drive->sect0;
|
602 |
|
|
}
|
603 |
|
|
/* Yecch - this will shift the entire interval,
|
604 |
|
|
possibly killing some innocent following sector */
|
605 |
|
|
if (block == 0 && drive->remap_0_to_1 == 1)
|
606 |
|
|
block = 1; /* redirect MBR access to EZ-Drive partn table */
|
607 |
|
|
|
608 |
|
|
SELECT_DRIVE(drive);
|
609 |
|
|
if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) {
|
610 |
|
|
printk(KERN_ERR "%s: drive not ready for command\n", drive->name);
|
611 |
|
|
return startstop;
|
612 |
|
|
}
|
613 |
|
|
if (!drive->special.all) {
|
614 |
|
|
switch(rq->cmd) {
|
615 |
|
|
case IDE_DRIVE_CMD:
|
616 |
|
|
case IDE_DRIVE_TASK:
|
617 |
|
|
return execute_drive_cmd(drive, rq);
|
618 |
|
|
case IDE_DRIVE_TASKFILE:
|
619 |
|
|
return execute_drive_cmd(drive, rq);
|
620 |
|
|
default:
|
621 |
|
|
break;
|
622 |
|
|
}
|
623 |
|
|
return (DRIVER(drive)->do_request(drive, rq, block));
|
624 |
|
|
}
|
625 |
|
|
return do_special(drive);
|
626 |
|
|
kill_rq:
|
627 |
|
|
DRIVER(drive)->end_request(drive, 0);
|
628 |
|
|
return ide_stopped;
|
629 |
|
|
}
|
630 |
|
|
|
631 |
|
|
/**
|
632 |
|
|
* ide_stall_queue - pause an IDE device
|
633 |
|
|
* @drive: drive to stall
|
634 |
|
|
* @timeout: time to stall for (jiffies)
|
635 |
|
|
*
|
636 |
|
|
* ide_stall_queue() can be used by a drive to give excess bandwidth back
|
637 |
|
|
* to the hwgroup by sleeping for timeout jiffies.
|
638 |
|
|
*/
|
639 |
|
|
|
640 |
|
|
void ide_stall_queue (ide_drive_t *drive, unsigned long timeout)
|
641 |
|
|
{
|
642 |
|
|
if (timeout > WAIT_WORSTCASE)
|
643 |
|
|
timeout = WAIT_WORSTCASE;
|
644 |
|
|
drive->sleep = timeout + jiffies;
|
645 |
|
|
}
|
646 |
|
|
|
647 |
|
|
EXPORT_SYMBOL(ide_stall_queue);
|
648 |
|
|
|
649 |
|
|
#define WAKEUP(drive) ((drive)->service_start + 2 * (drive)->service_time)
|
650 |
|
|
|
651 |
|
|
/**
|
652 |
|
|
* choose_drive - select a drive to service
|
653 |
|
|
* @hwgroup: hardware group to select on
|
654 |
|
|
*
|
655 |
|
|
* choose_drive() selects the next drive which will be serviced.
|
656 |
|
|
* This is neccessary because the IDE layer can't issue commands
|
657 |
|
|
* to both drives on the same cable, unlike SCSI.
|
658 |
|
|
*/
|
659 |
|
|
|
660 |
|
|
static inline ide_drive_t *choose_drive (ide_hwgroup_t *hwgroup)
|
661 |
|
|
{
|
662 |
|
|
ide_drive_t *drive, *best;
|
663 |
|
|
|
664 |
|
|
repeat:
|
665 |
|
|
best = NULL;
|
666 |
|
|
drive = hwgroup->drive;
|
667 |
|
|
do {
|
668 |
|
|
if (!blk_queue_empty(&drive->queue) && (!drive->sleep || time_after_eq(jiffies, drive->sleep))) {
|
669 |
|
|
if (!best
|
670 |
|
|
|| (drive->sleep && (!best->sleep || 0 < (signed long)(best->sleep - drive->sleep)))
|
671 |
|
|
|| (!best->sleep && 0 < (signed long)(WAKEUP(best) - WAKEUP(drive))))
|
672 |
|
|
{
|
673 |
|
|
if (!blk_queue_plugged(&drive->queue))
|
674 |
|
|
best = drive;
|
675 |
|
|
}
|
676 |
|
|
}
|
677 |
|
|
} while ((drive = drive->next) != hwgroup->drive);
|
678 |
|
|
if (best && best->nice1 && !best->sleep && best != hwgroup->drive && best->service_time > WAIT_MIN_SLEEP) {
|
679 |
|
|
long t = (signed long)(WAKEUP(best) - jiffies);
|
680 |
|
|
if (t >= WAIT_MIN_SLEEP) {
|
681 |
|
|
/*
|
682 |
|
|
* We *may* have some time to spare, but first let's see if
|
683 |
|
|
* someone can potentially benefit from our nice mood today..
|
684 |
|
|
*/
|
685 |
|
|
drive = best->next;
|
686 |
|
|
do {
|
687 |
|
|
if (!drive->sleep
|
688 |
|
|
&& 0 < (signed long)(WAKEUP(drive) - (jiffies - best->service_time))
|
689 |
|
|
&& 0 < (signed long)((jiffies + t) - WAKEUP(drive)))
|
690 |
|
|
{
|
691 |
|
|
ide_stall_queue(best, IDE_MIN(t, 10 * WAIT_MIN_SLEEP));
|
692 |
|
|
goto repeat;
|
693 |
|
|
}
|
694 |
|
|
} while ((drive = drive->next) != best);
|
695 |
|
|
}
|
696 |
|
|
}
|
697 |
|
|
return best;
|
698 |
|
|
}
|
699 |
|
|
|
700 |
|
|
/*
|
701 |
|
|
* Issue a new request to a drive from hwgroup
|
702 |
|
|
* Caller must have already done spin_lock_irqsave(&io_request_lock, ..);
|
703 |
|
|
*
|
704 |
|
|
* A hwgroup is a serialized group of IDE interfaces. Usually there is
|
705 |
|
|
* exactly one hwif (interface) per hwgroup, but buggy controllers (eg. CMD640)
|
706 |
|
|
* may have both interfaces in a single hwgroup to "serialize" access.
|
707 |
|
|
* Or possibly multiple ISA interfaces can share a common IRQ by being grouped
|
708 |
|
|
* together into one hwgroup for serialized access.
|
709 |
|
|
*
|
710 |
|
|
* Note also that several hwgroups can end up sharing a single IRQ,
|
711 |
|
|
* possibly along with many other devices. This is especially common in
|
712 |
|
|
* PCI-based systems with off-board IDE controller cards.
|
713 |
|
|
*
|
714 |
|
|
* The IDE driver uses the single global io_request_lock spinlock to protect
|
715 |
|
|
* access to the request queues, and to protect the hwgroup->busy flag.
|
716 |
|
|
*
|
717 |
|
|
* The first thread into the driver for a particular hwgroup sets the
|
718 |
|
|
* hwgroup->busy flag to indicate that this hwgroup is now active,
|
719 |
|
|
* and then initiates processing of the top request from the request queue.
|
720 |
|
|
*
|
721 |
|
|
* Other threads attempting entry notice the busy setting, and will simply
|
722 |
|
|
* queue their new requests and exit immediately. Note that hwgroup->busy
|
723 |
|
|
* remains set even when the driver is merely awaiting the next interrupt.
|
724 |
|
|
* Thus, the meaning is "this hwgroup is busy processing a request".
|
725 |
|
|
*
|
726 |
|
|
* When processing of a request completes, the completing thread or IRQ-handler
|
727 |
|
|
* will start the next request from the queue. If no more work remains,
|
728 |
|
|
* the driver will clear the hwgroup->busy flag and exit.
|
729 |
|
|
*
|
730 |
|
|
* The io_request_lock (spinlock) is used to protect all access to the
|
731 |
|
|
* hwgroup->busy flag, but is otherwise not needed for most processing in
|
732 |
|
|
* the driver. This makes the driver much more friendlier to shared IRQs
|
733 |
|
|
* than previous designs, while remaining 100% (?) SMP safe and capable.
|
734 |
|
|
*/
|
735 |
|
|
/* --BenH: made non-static as ide-pmac.c uses it to kick the hwgroup back
|
736 |
|
|
* into life on wakeup from machine sleep.
|
737 |
|
|
*/
|
738 |
|
|
void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
|
739 |
|
|
{
|
740 |
|
|
ide_drive_t *drive;
|
741 |
|
|
ide_hwif_t *hwif;
|
742 |
|
|
struct request *rq;
|
743 |
|
|
ide_startstop_t startstop;
|
744 |
|
|
|
745 |
|
|
/* for atari only: POSSIBLY BROKEN HERE(?) */
|
746 |
|
|
ide_get_lock(ide_intr, hwgroup);
|
747 |
|
|
|
748 |
|
|
/* necessary paranoia: ensure IRQs are masked on local CPU */
|
749 |
|
|
local_irq_disable();
|
750 |
|
|
|
751 |
|
|
while (!hwgroup->busy) {
|
752 |
|
|
hwgroup->busy = 1;
|
753 |
|
|
drive = choose_drive(hwgroup);
|
754 |
|
|
if (drive == NULL) {
|
755 |
|
|
unsigned long sleep = 0;
|
756 |
|
|
hwgroup->rq = NULL;
|
757 |
|
|
drive = hwgroup->drive;
|
758 |
|
|
do {
|
759 |
|
|
if (drive->sleep && (!sleep || 0 < (signed long)(sleep - drive->sleep)))
|
760 |
|
|
sleep = drive->sleep;
|
761 |
|
|
} while ((drive = drive->next) != hwgroup->drive);
|
762 |
|
|
if (sleep) {
|
763 |
|
|
/*
|
764 |
|
|
* Take a short snooze, and then wake up this hwgroup again.
|
765 |
|
|
* This gives other hwgroups on the same a chance to
|
766 |
|
|
* play fairly with us, just in case there are big differences
|
767 |
|
|
* in relative throughputs.. don't want to hog the cpu too much.
|
768 |
|
|
*/
|
769 |
|
|
if (time_before(sleep, jiffies + WAIT_MIN_SLEEP))
|
770 |
|
|
sleep = jiffies + WAIT_MIN_SLEEP;
|
771 |
|
|
#if 1
|
772 |
|
|
if (timer_pending(&hwgroup->timer))
|
773 |
|
|
printk(KERN_ERR "ide_set_handler: timer already active\n");
|
774 |
|
|
#endif
|
775 |
|
|
/* so that ide_timer_expiry knows what to do */
|
776 |
|
|
hwgroup->sleeping = 1;
|
777 |
|
|
mod_timer(&hwgroup->timer, sleep);
|
778 |
|
|
/* we purposely leave hwgroup->busy==1
|
779 |
|
|
* while sleeping */
|
780 |
|
|
} else {
|
781 |
|
|
/* Ugly, but how can we sleep for the lock
|
782 |
|
|
* otherwise? perhaps from tq_disk?
|
783 |
|
|
*/
|
784 |
|
|
|
785 |
|
|
/* for atari only */
|
786 |
|
|
ide_release_lock();
|
787 |
|
|
hwgroup->busy = 0;
|
788 |
|
|
}
|
789 |
|
|
/* no more work for this hwgroup (for now) */
|
790 |
|
|
return;
|
791 |
|
|
}
|
792 |
|
|
hwif = HWIF(drive);
|
793 |
|
|
if (hwgroup->hwif->sharing_irq &&
|
794 |
|
|
hwif != hwgroup->hwif &&
|
795 |
|
|
hwif->io_ports[IDE_CONTROL_OFFSET]) {
|
796 |
|
|
/* set nIEN for previous hwif */
|
797 |
|
|
SELECT_INTERRUPT(drive);
|
798 |
|
|
}
|
799 |
|
|
hwgroup->hwif = hwif;
|
800 |
|
|
hwgroup->drive = drive;
|
801 |
|
|
drive->sleep = 0;
|
802 |
|
|
drive->service_start = jiffies;
|
803 |
|
|
|
804 |
|
|
/* paranoia */
|
805 |
|
|
if (blk_queue_plugged(&drive->queue))
|
806 |
|
|
printk(KERN_ERR "%s: Huh? nuking plugged queue\n", drive->name);
|
807 |
|
|
|
808 |
|
|
rq = blkdev_entry_next_request(&drive->queue.queue_head);
|
809 |
|
|
hwgroup->rq = rq;
|
810 |
|
|
/*
|
811 |
|
|
* Some systems have trouble with IDE IRQs arriving while
|
812 |
|
|
* the driver is still setting things up. So, here we disable
|
813 |
|
|
* the IRQ used by this interface while the request is being started.
|
814 |
|
|
* This may look bad at first, but pretty much the same thing
|
815 |
|
|
* happens anyway when any interrupt comes in, IDE or otherwise
|
816 |
|
|
* -- the kernel masks the IRQ while it is being handled.
|
817 |
|
|
*/
|
818 |
|
|
if (hwif->irq != masked_irq)
|
819 |
|
|
disable_irq_nosync(hwif->irq);
|
820 |
|
|
spin_unlock(&io_request_lock);
|
821 |
|
|
local_irq_enable();
|
822 |
|
|
/* allow other IRQs while we start this request */
|
823 |
|
|
startstop = ide_start_request(drive, rq);
|
824 |
|
|
spin_lock_irq(&io_request_lock);
|
825 |
|
|
if (hwif->irq != masked_irq)
|
826 |
|
|
enable_irq(hwif->irq);
|
827 |
|
|
if (startstop == ide_stopped)
|
828 |
|
|
hwgroup->busy = 0;
|
829 |
|
|
}
|
830 |
|
|
}
|
831 |
|
|
|
832 |
|
|
EXPORT_SYMBOL(ide_do_request);
|
833 |
|
|
|
834 |
|
|
/*
|
835 |
|
|
* ide_get_queue() returns the queue which corresponds to a given device.
|
836 |
|
|
*/
|
837 |
|
|
request_queue_t *ide_get_queue (kdev_t dev)
|
838 |
|
|
{
|
839 |
|
|
ide_hwif_t *hwif = (ide_hwif_t *)blk_dev[MAJOR(dev)].data;
|
840 |
|
|
|
841 |
|
|
return &hwif->drives[DEVICE_NR(dev) & 1].queue;
|
842 |
|
|
}
|
843 |
|
|
|
844 |
|
|
EXPORT_SYMBOL(ide_get_queue);
|
845 |
|
|
|
846 |
|
|
/*
|
847 |
|
|
* Passes the stuff to ide_do_request
|
848 |
|
|
*/
|
849 |
|
|
void do_ide_request(request_queue_t *q)
|
850 |
|
|
{
|
851 |
|
|
ide_do_request(q->queuedata, IDE_NO_IRQ);
|
852 |
|
|
}
|
853 |
|
|
|
854 |
|
|
EXPORT_SYMBOL(do_ide_request);
|
855 |
|
|
|
856 |
|
|
/*
|
857 |
|
|
* un-busy the hwgroup etc, and clear any pending DMA status. we want to
|
858 |
|
|
* retry the current request in pio mode instead of risking tossing it
|
859 |
|
|
* all away
|
860 |
|
|
*/
|
861 |
|
|
static ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error)
|
862 |
|
|
{
|
863 |
|
|
ide_hwif_t *hwif = HWIF(drive);
|
864 |
|
|
struct request *rq;
|
865 |
|
|
ide_startstop_t ret = ide_stopped;
|
866 |
|
|
|
867 |
|
|
/*
|
868 |
|
|
* end current dma transaction
|
869 |
|
|
*/
|
870 |
|
|
(void) hwif->ide_dma_end(drive);
|
871 |
|
|
|
872 |
|
|
/*
|
873 |
|
|
* complain a little, later we might remove some of this verbosity
|
874 |
|
|
*/
|
875 |
|
|
|
876 |
|
|
if (error < 0) {
|
877 |
|
|
printk(KERN_ERR "%s: error waiting for DMA\n", drive->name);
|
878 |
|
|
(void)HWIF(drive)->ide_dma_end(drive);
|
879 |
|
|
ret = DRIVER(drive)->error(drive, "dma timeout retry",
|
880 |
|
|
hwif->INB(IDE_STATUS_REG));
|
881 |
|
|
} else {
|
882 |
|
|
printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name);
|
883 |
|
|
(void) hwif->ide_dma_timeout(drive);
|
884 |
|
|
}
|
885 |
|
|
|
886 |
|
|
/*
|
887 |
|
|
* disable dma for now, but remember that we did so because of
|
888 |
|
|
* a timeout -- we'll reenable after we finish this next request
|
889 |
|
|
* (or rather the first chunk of it) in pio.
|
890 |
|
|
*/
|
891 |
|
|
drive->retry_pio++;
|
892 |
|
|
drive->state = DMA_PIO_RETRY;
|
893 |
|
|
(void) hwif->ide_dma_off_quietly(drive);
|
894 |
|
|
|
895 |
|
|
/*
|
896 |
|
|
* un-busy drive etc (hwgroup->busy is cleared on return) and
|
897 |
|
|
* make sure request is sane
|
898 |
|
|
*/
|
899 |
|
|
rq = HWGROUP(drive)->rq;
|
900 |
|
|
HWGROUP(drive)->rq = NULL;
|
901 |
|
|
|
902 |
|
|
rq->errors = 0;
|
903 |
|
|
rq->sector = rq->bh->b_rsector;
|
904 |
|
|
rq->current_nr_sectors = rq->bh->b_size >> 9;
|
905 |
|
|
rq->hard_cur_sectors = rq->current_nr_sectors;
|
906 |
|
|
rq->buffer = rq->bh->b_data;
|
907 |
|
|
|
908 |
|
|
return ret;
|
909 |
|
|
}
|
910 |
|
|
|
911 |
|
|
/**
|
912 |
|
|
* ide_timer_expiry - handle lack of an IDE interrupt
|
913 |
|
|
* @data: timer callback magic (hwgroup)
|
914 |
|
|
*
|
915 |
|
|
* An IDE command has timed out before the expected drive return
|
916 |
|
|
* occurred. At this point we attempt to clean up the current
|
917 |
|
|
* mess. If the current handler includes an expiry handler then
|
918 |
|
|
* we invoke the expiry handler, and providing it is happy the
|
919 |
|
|
* work is done. If that fails we apply generic recovery rules
|
920 |
|
|
* invoking the handler and checking the drive DMA status. We
|
921 |
|
|
* have an excessively incestuous relationship with the DMA
|
922 |
|
|
* logic that wants cleaning up.
|
923 |
|
|
*/
|
924 |
|
|
|
925 |
|
|
void ide_timer_expiry (unsigned long data)
|
926 |
|
|
{
|
927 |
|
|
ide_hwgroup_t *hwgroup = (ide_hwgroup_t *) data;
|
928 |
|
|
ide_handler_t *handler;
|
929 |
|
|
ide_expiry_t *expiry;
|
930 |
|
|
unsigned long flags;
|
931 |
|
|
unsigned long wait = -1;
|
932 |
|
|
|
933 |
|
|
spin_lock_irqsave(&io_request_lock, flags);
|
934 |
|
|
|
935 |
|
|
if ((handler = hwgroup->handler) == NULL) {
|
936 |
|
|
/*
|
937 |
|
|
* Either a marginal timeout occurred
|
938 |
|
|
* (got the interrupt just as timer expired),
|
939 |
|
|
* or we were "sleeping" to give other devices a chance.
|
940 |
|
|
* Either way, we don't really want to complain about anything.
|
941 |
|
|
*/
|
942 |
|
|
if (hwgroup->sleeping) {
|
943 |
|
|
hwgroup->sleeping = 0;
|
944 |
|
|
hwgroup->busy = 0;
|
945 |
|
|
}
|
946 |
|
|
} else {
|
947 |
|
|
ide_drive_t *drive = hwgroup->drive;
|
948 |
|
|
if (!drive) {
|
949 |
|
|
printk(KERN_ERR "ide_timer_expiry: hwgroup->drive was NULL\n");
|
950 |
|
|
hwgroup->handler = NULL;
|
951 |
|
|
} else {
|
952 |
|
|
ide_hwif_t *hwif;
|
953 |
|
|
ide_startstop_t startstop = ide_stopped;
|
954 |
|
|
if (!hwgroup->busy) {
|
955 |
|
|
hwgroup->busy = 1; /* paranoia */
|
956 |
|
|
printk(KERN_ERR "%s: ide_timer_expiry: hwgroup->busy was 0 ??\n", drive->name);
|
957 |
|
|
}
|
958 |
|
|
if ((expiry = hwgroup->expiry) != NULL) {
|
959 |
|
|
/* continue */
|
960 |
|
|
if ((wait = expiry(drive)) > 0) {
|
961 |
|
|
/* reset timer */
|
962 |
|
|
hwgroup->timer.expires = jiffies + wait;
|
963 |
|
|
add_timer(&hwgroup->timer);
|
964 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
965 |
|
|
return;
|
966 |
|
|
}
|
967 |
|
|
}
|
968 |
|
|
hwgroup->handler = NULL;
|
969 |
|
|
/*
|
970 |
|
|
* We need to simulate a real interrupt when invoking
|
971 |
|
|
* the handler() function, which means we need to
|
972 |
|
|
* globally mask the specific IRQ:
|
973 |
|
|
*/
|
974 |
|
|
spin_unlock(&io_request_lock);
|
975 |
|
|
hwif = HWIF(drive);
|
976 |
|
|
#if DISABLE_IRQ_NOSYNC
|
977 |
|
|
disable_irq_nosync(hwif->irq);
|
978 |
|
|
#else
|
979 |
|
|
/* disable_irq_nosync ?? */
|
980 |
|
|
disable_irq(hwif->irq);
|
981 |
|
|
#endif /* DISABLE_IRQ_NOSYNC */
|
982 |
|
|
|
983 |
|
|
/* local CPU only,
|
984 |
|
|
* as if we were handling an interrupt */
|
985 |
|
|
local_irq_disable();
|
986 |
|
|
if (hwgroup->poll_timeout != 0) {
|
987 |
|
|
startstop = handler(drive);
|
988 |
|
|
} else if (drive_is_ready(drive)) {
|
989 |
|
|
if (drive->waiting_for_dma)
|
990 |
|
|
(void) hwgroup->hwif->ide_dma_lostirq(drive);
|
991 |
|
|
(void)ide_ack_intr(hwif);
|
992 |
|
|
printk(KERN_ERR "%s: lost interrupt\n", drive->name);
|
993 |
|
|
startstop = handler(drive);
|
994 |
|
|
} else {
|
995 |
|
|
if (drive->waiting_for_dma) {
|
996 |
|
|
startstop = ide_dma_timeout_retry(drive, wait);
|
997 |
|
|
} else {
|
998 |
|
|
startstop = DRIVER(drive)->error(drive, "irq timeout", hwif->INB(IDE_STATUS_REG));
|
999 |
|
|
}
|
1000 |
|
|
}
|
1001 |
|
|
drive->service_time = jiffies - drive->service_start;
|
1002 |
|
|
spin_lock_irq(&io_request_lock);
|
1003 |
|
|
enable_irq(hwif->irq);
|
1004 |
|
|
if (startstop == ide_stopped)
|
1005 |
|
|
hwgroup->busy = 0;
|
1006 |
|
|
}
|
1007 |
|
|
}
|
1008 |
|
|
ide_do_request(hwgroup, IDE_NO_IRQ);
|
1009 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
1010 |
|
|
}
|
1011 |
|
|
|
1012 |
|
|
EXPORT_SYMBOL(ide_timer_expiry);
|
1013 |
|
|
|
1014 |
|
|
/**
|
1015 |
|
|
* unexpected_intr - handle an unexpected IDE interrupt
|
1016 |
|
|
* @irq: interrupt line
|
1017 |
|
|
* @hwgroup: hwgroup being processed
|
1018 |
|
|
*
|
1019 |
|
|
* There's nothing really useful we can do with an unexpected interrupt,
|
1020 |
|
|
* other than reading the status register (to clear it), and logging it.
|
1021 |
|
|
* There should be no way that an irq can happen before we're ready for it,
|
1022 |
|
|
* so we needn't worry much about losing an "important" interrupt here.
|
1023 |
|
|
*
|
1024 |
|
|
* On laptops (and "green" PCs), an unexpected interrupt occurs whenever
|
1025 |
|
|
* the drive enters "idle", "standby", or "sleep" mode, so if the status
|
1026 |
|
|
* looks "good", we just ignore the interrupt completely.
|
1027 |
|
|
*
|
1028 |
|
|
* This routine assumes __cli() is in effect when called.
|
1029 |
|
|
*
|
1030 |
|
|
* If an unexpected interrupt happens on irq15 while we are handling irq14
|
1031 |
|
|
* and if the two interfaces are "serialized" (CMD640), then it looks like
|
1032 |
|
|
* we could screw up by interfering with a new request being set up for
|
1033 |
|
|
* irq15.
|
1034 |
|
|
*
|
1035 |
|
|
* In reality, this is a non-issue. The new command is not sent unless
|
1036 |
|
|
* the drive is ready to accept one, in which case we know the drive is
|
1037 |
|
|
* not trying to interrupt us. And ide_set_handler() is always invoked
|
1038 |
|
|
* before completing the issuance of any new drive command, so we will not
|
1039 |
|
|
* be accidentally invoked as a result of any valid command completion
|
1040 |
|
|
* interrupt.
|
1041 |
|
|
*
|
1042 |
|
|
* Note that we must walk the entire hwgroup here. We know which hwif
|
1043 |
|
|
* is doing the current command, but we don't know which hwif burped
|
1044 |
|
|
* mysteriously.
|
1045 |
|
|
*/
|
1046 |
|
|
|
1047 |
|
|
static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
|
1048 |
|
|
{
|
1049 |
|
|
u8 stat;
|
1050 |
|
|
ide_hwif_t *hwif = hwgroup->hwif;
|
1051 |
|
|
|
1052 |
|
|
/*
|
1053 |
|
|
* handle the unexpected interrupt
|
1054 |
|
|
*/
|
1055 |
|
|
do {
|
1056 |
|
|
if (hwif->irq == irq) {
|
1057 |
|
|
stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
|
1058 |
|
|
if (!OK_STAT(stat, READY_STAT, BAD_STAT)) {
|
1059 |
|
|
/* Try to not flood the console with msgs */
|
1060 |
|
|
static unsigned long last_msgtime, count;
|
1061 |
|
|
++count;
|
1062 |
|
|
if (time_after(jiffies, last_msgtime + HZ)) {
|
1063 |
|
|
last_msgtime = jiffies;
|
1064 |
|
|
printk(KERN_ERR "%s%s: unexpected interrupt, "
|
1065 |
|
|
"status=0x%02x, count=%ld\n",
|
1066 |
|
|
hwif->name,
|
1067 |
|
|
(hwif->next==hwgroup->hwif) ? "" : "(?)", stat, count);
|
1068 |
|
|
}
|
1069 |
|
|
}
|
1070 |
|
|
}
|
1071 |
|
|
} while ((hwif = hwif->next) != hwgroup->hwif);
|
1072 |
|
|
}
|
1073 |
|
|
|
1074 |
|
|
/**
|
1075 |
|
|
* ide_intr - default IDE interrupt handler
|
1076 |
|
|
* @irq: interrupt number
|
1077 |
|
|
* @dev_id: hwif group
|
1078 |
|
|
* @regs: unused weirdness from the kernel irq layer
|
1079 |
|
|
*
|
1080 |
|
|
* This is the default IRQ handler for the IDE layer. You should
|
1081 |
|
|
* not need to override it. If you do be aware it is subtle in
|
1082 |
|
|
* places
|
1083 |
|
|
*
|
1084 |
|
|
* hwgroup->hwif is the interface in the group currently performing
|
1085 |
|
|
* a command. hwgroup->drive is the drive and hwgroup->handler is
|
1086 |
|
|
* the IRQ handler to call. As we issue a command the handlers
|
1087 |
|
|
* step through multiple states, reassigning the handler to the
|
1088 |
|
|
* next step in the process. Unlike a smart SCSI controller IDE
|
1089 |
|
|
* expects the main processor to sequence the various transfer
|
1090 |
|
|
* stages. We also manage a poll timer to catch up with most
|
1091 |
|
|
* timeout situations. There are still a few where the handlers
|
1092 |
|
|
* don't ever decide to give up.
|
1093 |
|
|
*
|
1094 |
|
|
* The handler eventually returns ide_stopped to indicate the
|
1095 |
|
|
* request completed. At this point we issue the next request
|
1096 |
|
|
* on the hwgroup and the process begins again.
|
1097 |
|
|
*/
|
1098 |
|
|
|
1099 |
|
|
void ide_intr (int irq, void *dev_id, struct pt_regs *regs)
|
1100 |
|
|
{
|
1101 |
|
|
unsigned long flags;
|
1102 |
|
|
ide_hwgroup_t *hwgroup = (ide_hwgroup_t *)dev_id;
|
1103 |
|
|
ide_hwif_t *hwif;
|
1104 |
|
|
ide_drive_t *drive;
|
1105 |
|
|
ide_handler_t *handler;
|
1106 |
|
|
ide_startstop_t startstop;
|
1107 |
|
|
|
1108 |
|
|
spin_lock_irqsave(&io_request_lock, flags);
|
1109 |
|
|
hwif = hwgroup->hwif;
|
1110 |
|
|
|
1111 |
|
|
if (!ide_ack_intr(hwif)) {
|
1112 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
1113 |
|
|
return;
|
1114 |
|
|
}
|
1115 |
|
|
|
1116 |
|
|
if ((handler = hwgroup->handler) == NULL ||
|
1117 |
|
|
hwgroup->poll_timeout != 0) {
|
1118 |
|
|
/*
|
1119 |
|
|
* Not expecting an interrupt from this drive.
|
1120 |
|
|
* That means this could be:
|
1121 |
|
|
* (1) an interrupt from another PCI device
|
1122 |
|
|
* sharing the same PCI INT# as us.
|
1123 |
|
|
* or (2) a drive just entered sleep or standby mode,
|
1124 |
|
|
* and is interrupting to let us know.
|
1125 |
|
|
* or (3) a spurious interrupt of unknown origin.
|
1126 |
|
|
*
|
1127 |
|
|
* For PCI, we cannot tell the difference,
|
1128 |
|
|
* so in that case we just ignore it and hope it goes away.
|
1129 |
|
|
*/
|
1130 |
|
|
#ifdef CONFIG_BLK_DEV_IDEPCI
|
1131 |
|
|
if (hwif->pci_dev && !hwif->pci_dev->vendor)
|
1132 |
|
|
#endif /* CONFIG_BLK_DEV_IDEPCI */
|
1133 |
|
|
{
|
1134 |
|
|
/*
|
1135 |
|
|
* Probably not a shared PCI interrupt,
|
1136 |
|
|
* so we can safely try to do something about it:
|
1137 |
|
|
*/
|
1138 |
|
|
unexpected_intr(irq, hwgroup);
|
1139 |
|
|
#ifdef CONFIG_BLK_DEV_IDEPCI
|
1140 |
|
|
} else {
|
1141 |
|
|
/*
|
1142 |
|
|
* Whack the status register, just in case
|
1143 |
|
|
* we have a leftover pending IRQ.
|
1144 |
|
|
*/
|
1145 |
|
|
(void) hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
|
1146 |
|
|
#endif /* CONFIG_BLK_DEV_IDEPCI */
|
1147 |
|
|
}
|
1148 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
1149 |
|
|
return;
|
1150 |
|
|
}
|
1151 |
|
|
drive = hwgroup->drive;
|
1152 |
|
|
if (!drive) {
|
1153 |
|
|
/*
|
1154 |
|
|
* This should NEVER happen, and there isn't much
|
1155 |
|
|
* we could do about it here.
|
1156 |
|
|
*/
|
1157 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
1158 |
|
|
return;
|
1159 |
|
|
}
|
1160 |
|
|
if (!drive_is_ready(drive)) {
|
1161 |
|
|
/*
|
1162 |
|
|
* This happens regularly when we share a PCI IRQ with
|
1163 |
|
|
* another device. Unfortunately, it can also happen
|
1164 |
|
|
* with some buggy drives that trigger the IRQ before
|
1165 |
|
|
* their status register is up to date. Hopefully we have
|
1166 |
|
|
* enough advance overhead that the latter isn't a problem.
|
1167 |
|
|
*/
|
1168 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
1169 |
|
|
return;
|
1170 |
|
|
}
|
1171 |
|
|
if (!hwgroup->busy) {
|
1172 |
|
|
hwgroup->busy = 1; /* paranoia */
|
1173 |
|
|
printk(KERN_ERR "%s: ide_intr: hwgroup->busy was 0 ??\n", drive->name);
|
1174 |
|
|
}
|
1175 |
|
|
hwgroup->handler = NULL;
|
1176 |
|
|
del_timer(&hwgroup->timer);
|
1177 |
|
|
spin_unlock(&io_request_lock);
|
1178 |
|
|
|
1179 |
|
|
if (drive->unmask)
|
1180 |
|
|
local_irq_enable();
|
1181 |
|
|
|
1182 |
|
|
/* service this interrupt, may set handler for next interrupt */
|
1183 |
|
|
startstop = handler(drive);
|
1184 |
|
|
spin_lock_irq(&io_request_lock);
|
1185 |
|
|
|
1186 |
|
|
/*
|
1187 |
|
|
* Note that handler() may have set things up for another
|
1188 |
|
|
* interrupt to occur soon, but it cannot happen until
|
1189 |
|
|
* we exit from this routine, because it will be the
|
1190 |
|
|
* same irq as is currently being serviced here, and Linux
|
1191 |
|
|
* won't allow another of the same (on any CPU) until we return.
|
1192 |
|
|
*/
|
1193 |
|
|
drive->service_time = jiffies - drive->service_start;
|
1194 |
|
|
if (startstop == ide_stopped) {
|
1195 |
|
|
if (hwgroup->handler == NULL) { /* paranoia */
|
1196 |
|
|
hwgroup->busy = 0;
|
1197 |
|
|
ide_do_request(hwgroup, hwif->irq);
|
1198 |
|
|
} else {
|
1199 |
|
|
printk(KERN_ERR "%s: ide_intr: huh? expected NULL handler "
|
1200 |
|
|
"on exit\n", drive->name);
|
1201 |
|
|
}
|
1202 |
|
|
}
|
1203 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
1204 |
|
|
}
|
1205 |
|
|
|
1206 |
|
|
EXPORT_SYMBOL(ide_intr);
|
1207 |
|
|
|
1208 |
|
|
/*
|
1209 |
|
|
* get_info_ptr() returns the (ide_drive_t *) for a given device number.
|
1210 |
|
|
* It returns NULL if the given device number does not match any present drives.
|
1211 |
|
|
*/
|
1212 |
|
|
ide_drive_t *ide_info_ptr (kdev_t i_rdev, int force)
|
1213 |
|
|
{
|
1214 |
|
|
int major = MAJOR(i_rdev);
|
1215 |
|
|
unsigned int h;
|
1216 |
|
|
|
1217 |
|
|
for (h = 0; h < MAX_HWIFS; ++h) {
|
1218 |
|
|
ide_hwif_t *hwif = &ide_hwifs[h];
|
1219 |
|
|
if (hwif->present && major == hwif->major) {
|
1220 |
|
|
unsigned unit = DEVICE_NR(i_rdev);
|
1221 |
|
|
if (unit < MAX_DRIVES) {
|
1222 |
|
|
ide_drive_t *drive = &hwif->drives[unit];
|
1223 |
|
|
if (drive->present || force)
|
1224 |
|
|
return drive;
|
1225 |
|
|
}
|
1226 |
|
|
break;
|
1227 |
|
|
}
|
1228 |
|
|
}
|
1229 |
|
|
return NULL;
|
1230 |
|
|
}
|
1231 |
|
|
|
1232 |
|
|
EXPORT_SYMBOL(ide_info_ptr);
|
1233 |
|
|
|
1234 |
|
|
/**
|
1235 |
|
|
* ide_init_drive_cmd - initialize a drive command request
|
1236 |
|
|
* @rq: request object
|
1237 |
|
|
*
|
1238 |
|
|
* Initialize a request before we fill it in and send it down to
|
1239 |
|
|
* ide_do_drive_cmd. Commands must be set up by this function. Right
|
1240 |
|
|
* now it doesn't do a lot, but if that changes abusers will have a
|
1241 |
|
|
* nasty suprise.
|
1242 |
|
|
*/
|
1243 |
|
|
|
1244 |
|
|
void ide_init_drive_cmd (struct request *rq)
|
1245 |
|
|
{
|
1246 |
|
|
memset(rq, 0, sizeof(*rq));
|
1247 |
|
|
rq->cmd = IDE_DRIVE_CMD;
|
1248 |
|
|
}
|
1249 |
|
|
|
1250 |
|
|
EXPORT_SYMBOL(ide_init_drive_cmd);
|
1251 |
|
|
|
1252 |
|
|
/**
|
1253 |
|
|
* ide_do_drive_cmd - issue IDE special command
|
1254 |
|
|
* @drive: device to issue command
|
1255 |
|
|
* @rq: request to issue
|
1256 |
|
|
* @action: action for processing
|
1257 |
|
|
*
|
1258 |
|
|
* This function issues a special IDE device request
|
1259 |
|
|
* onto the request queue.
|
1260 |
|
|
*
|
1261 |
|
|
* If action is ide_wait, then the rq is queued at the end of the
|
1262 |
|
|
* request queue, and the function sleeps until it has been processed.
|
1263 |
|
|
* This is for use when invoked from an ioctl handler.
|
1264 |
|
|
*
|
1265 |
|
|
* If action is ide_preempt, then the rq is queued at the head of
|
1266 |
|
|
* the request queue, displacing the currently-being-processed
|
1267 |
|
|
* request and this function returns immediately without waiting
|
1268 |
|
|
* for the new rq to be completed. This is VERY DANGEROUS, and is
|
1269 |
|
|
* intended for careful use by the ATAPI tape/cdrom driver code.
|
1270 |
|
|
*
|
1271 |
|
|
* If action is ide_next, then the rq is queued immediately after
|
1272 |
|
|
* the currently-being-processed-request (if any), and the function
|
1273 |
|
|
* returns without waiting for the new rq to be completed. As above,
|
1274 |
|
|
* This is VERY DANGEROUS, and is intended for careful use by the
|
1275 |
|
|
* ATAPI tape/cdrom driver code.
|
1276 |
|
|
*
|
1277 |
|
|
* If action is ide_end, then the rq is queued at the end of the
|
1278 |
|
|
* request queue, and the function returns immediately without waiting
|
1279 |
|
|
* for the new rq to be completed. This is again intended for careful
|
1280 |
|
|
* use by the ATAPI tape/cdrom driver code.
|
1281 |
|
|
*/
|
1282 |
|
|
|
1283 |
|
|
int ide_do_drive_cmd (ide_drive_t *drive, struct request *rq, ide_action_t action)
|
1284 |
|
|
{
|
1285 |
|
|
unsigned long flags;
|
1286 |
|
|
ide_hwgroup_t *hwgroup = HWGROUP(drive);
|
1287 |
|
|
unsigned int major = HWIF(drive)->major;
|
1288 |
|
|
request_queue_t *q = &drive->queue;
|
1289 |
|
|
struct list_head *queue_head = &q->queue_head;
|
1290 |
|
|
DECLARE_COMPLETION(wait);
|
1291 |
|
|
|
1292 |
|
|
#ifdef CONFIG_BLK_DEV_PDC4030
|
1293 |
|
|
if (HWIF(drive)->chipset == ide_pdc4030 && rq->buffer != NULL)
|
1294 |
|
|
return -ENOSYS; /* special drive cmds not supported */
|
1295 |
|
|
#endif
|
1296 |
|
|
rq->errors = 0;
|
1297 |
|
|
rq->rq_status = RQ_ACTIVE;
|
1298 |
|
|
rq->rq_dev = MKDEV(major,(drive->select.b.unit)<<PARTN_BITS);
|
1299 |
|
|
if (action == ide_wait)
|
1300 |
|
|
rq->waiting = &wait;
|
1301 |
|
|
spin_lock_irqsave(&io_request_lock, flags);
|
1302 |
|
|
if (blk_queue_empty(q) || action == ide_preempt) {
|
1303 |
|
|
if (action == ide_preempt)
|
1304 |
|
|
hwgroup->rq = NULL;
|
1305 |
|
|
} else {
|
1306 |
|
|
if (action == ide_wait || action == ide_end) {
|
1307 |
|
|
queue_head = queue_head->prev;
|
1308 |
|
|
} else
|
1309 |
|
|
queue_head = queue_head->next;
|
1310 |
|
|
}
|
1311 |
|
|
list_add(&rq->queue, queue_head);
|
1312 |
|
|
ide_do_request(hwgroup, IDE_NO_IRQ);
|
1313 |
|
|
spin_unlock_irqrestore(&io_request_lock, flags);
|
1314 |
|
|
if (action == ide_wait) {
|
1315 |
|
|
/* wait for it to be serviced */
|
1316 |
|
|
wait_for_completion(&wait);
|
1317 |
|
|
/* return -EIO if errors */
|
1318 |
|
|
return rq->errors ? -EIO : 0;
|
1319 |
|
|
}
|
1320 |
|
|
return 0;
|
1321 |
|
|
|
1322 |
|
|
}
|
1323 |
|
|
|
1324 |
|
|
EXPORT_SYMBOL(ide_do_drive_cmd);
|