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904 lines
24 KiB
904 lines
24 KiB
/* |
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* IDE I/O functions |
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* |
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* Basic PIO and command management functionality. |
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* |
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* This code was split off from ide.c. See ide.c for history and original |
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* copyrights. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2, or (at your option) any |
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* later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* For the avoidance of doubt the "preferred form" of this code is one which |
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* is in an open non patent encumbered format. Where cryptographic key signing |
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* forms part of the process of creating an executable the information |
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* including keys needed to generate an equivalently functional executable |
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* are deemed to be part of the source code. |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/kernel.h> |
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#include <linux/timer.h> |
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#include <linux/mm.h> |
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#include <linux/interrupt.h> |
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#include <linux/major.h> |
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#include <linux/errno.h> |
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#include <linux/genhd.h> |
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#include <linux/blkpg.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/pci.h> |
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#include <linux/delay.h> |
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#include <linux/ide.h> |
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#include <linux/completion.h> |
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#include <linux/reboot.h> |
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#include <linux/cdrom.h> |
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#include <linux/seq_file.h> |
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#include <linux/device.h> |
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#include <linux/kmod.h> |
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#include <linux/scatterlist.h> |
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#include <linux/bitops.h> |
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|
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#include <asm/byteorder.h> |
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#include <asm/irq.h> |
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#include <linux/uaccess.h> |
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#include <asm/io.h> |
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|
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int ide_end_rq(ide_drive_t *drive, struct request *rq, blk_status_t error, |
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unsigned int nr_bytes) |
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{ |
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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->dev_flags & IDE_DFLAG_DMA_PIO_RETRY) && |
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drive->retry_pio <= 3) { |
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drive->dev_flags &= ~IDE_DFLAG_DMA_PIO_RETRY; |
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ide_dma_on(drive); |
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} |
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|
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if (!blk_update_request(rq, error, nr_bytes)) { |
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if (rq == drive->sense_rq) { |
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drive->sense_rq = NULL; |
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drive->sense_rq_active = false; |
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} |
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|
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__blk_mq_end_request(rq, error); |
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return 0; |
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} |
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|
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return 1; |
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} |
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EXPORT_SYMBOL_GPL(ide_end_rq); |
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|
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void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err) |
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{ |
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const struct ide_tp_ops *tp_ops = drive->hwif->tp_ops; |
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struct ide_taskfile *tf = &cmd->tf; |
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struct request *rq = cmd->rq; |
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u8 tf_cmd = tf->command; |
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|
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tf->error = err; |
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tf->status = stat; |
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|
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if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) { |
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u8 data[2]; |
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|
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tp_ops->input_data(drive, cmd, data, 2); |
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|
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cmd->tf.data = data[0]; |
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cmd->hob.data = data[1]; |
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} |
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|
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ide_tf_readback(drive, cmd); |
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|
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if ((cmd->tf_flags & IDE_TFLAG_CUSTOM_HANDLER) && |
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tf_cmd == ATA_CMD_IDLEIMMEDIATE) { |
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if (tf->lbal != 0xc4) { |
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printk(KERN_ERR "%s: head unload failed!\n", |
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drive->name); |
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ide_tf_dump(drive->name, cmd); |
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} else |
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drive->dev_flags |= IDE_DFLAG_PARKED; |
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} |
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|
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if (rq && ata_taskfile_request(rq)) { |
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struct ide_cmd *orig_cmd = ide_req(rq)->special; |
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|
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if (cmd->tf_flags & IDE_TFLAG_DYN) |
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kfree(orig_cmd); |
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else if (cmd != orig_cmd) |
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memcpy(orig_cmd, cmd, sizeof(*cmd)); |
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} |
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} |
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|
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int ide_complete_rq(ide_drive_t *drive, blk_status_t error, unsigned int nr_bytes) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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struct request *rq = hwif->rq; |
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int rc; |
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|
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/* |
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* if failfast is set on a request, override number of sectors |
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* and complete the whole request right now |
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*/ |
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if (blk_noretry_request(rq) && error) |
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nr_bytes = blk_rq_sectors(rq) << 9; |
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|
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rc = ide_end_rq(drive, rq, error, nr_bytes); |
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if (rc == 0) |
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hwif->rq = NULL; |
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|
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return rc; |
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} |
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EXPORT_SYMBOL(ide_complete_rq); |
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|
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void ide_kill_rq(ide_drive_t *drive, struct request *rq) |
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{ |
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u8 drv_req = ata_misc_request(rq) && rq->rq_disk; |
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u8 media = drive->media; |
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|
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drive->failed_pc = NULL; |
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|
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if ((media == ide_floppy || media == ide_tape) && drv_req) { |
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scsi_req(rq)->result = 0; |
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} else { |
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if (media == ide_tape) |
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scsi_req(rq)->result = IDE_DRV_ERROR_GENERAL; |
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else if (blk_rq_is_passthrough(rq) && scsi_req(rq)->result == 0) |
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scsi_req(rq)->result = -EIO; |
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} |
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|
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ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(rq)); |
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} |
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|
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static void ide_tf_set_specify_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
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{ |
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tf->nsect = drive->sect; |
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tf->lbal = drive->sect; |
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tf->lbam = drive->cyl; |
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tf->lbah = drive->cyl >> 8; |
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tf->device = (drive->head - 1) | drive->select; |
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tf->command = ATA_CMD_INIT_DEV_PARAMS; |
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} |
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|
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static void ide_tf_set_restore_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
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{ |
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tf->nsect = drive->sect; |
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tf->command = ATA_CMD_RESTORE; |
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} |
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|
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static void ide_tf_set_setmult_cmd(ide_drive_t *drive, struct ide_taskfile *tf) |
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{ |
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tf->nsect = drive->mult_req; |
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tf->command = ATA_CMD_SET_MULTI; |
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} |
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|
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/** |
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* do_special - issue some special commands |
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* @drive: drive the command is for |
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* |
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* do_special() is used to issue ATA_CMD_INIT_DEV_PARAMS, |
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* ATA_CMD_RESTORE and ATA_CMD_SET_MULTI commands to a drive. |
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*/ |
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|
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static ide_startstop_t do_special(ide_drive_t *drive) |
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{ |
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struct ide_cmd cmd; |
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|
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#ifdef DEBUG |
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printk(KERN_DEBUG "%s: %s: 0x%02x\n", drive->name, __func__, |
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drive->special_flags); |
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#endif |
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if (drive->media != ide_disk) { |
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drive->special_flags = 0; |
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drive->mult_req = 0; |
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return ide_stopped; |
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} |
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|
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memset(&cmd, 0, sizeof(cmd)); |
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cmd.protocol = ATA_PROT_NODATA; |
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|
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if (drive->special_flags & IDE_SFLAG_SET_GEOMETRY) { |
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drive->special_flags &= ~IDE_SFLAG_SET_GEOMETRY; |
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ide_tf_set_specify_cmd(drive, &cmd.tf); |
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} else if (drive->special_flags & IDE_SFLAG_RECALIBRATE) { |
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drive->special_flags &= ~IDE_SFLAG_RECALIBRATE; |
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ide_tf_set_restore_cmd(drive, &cmd.tf); |
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} else if (drive->special_flags & IDE_SFLAG_SET_MULTMODE) { |
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drive->special_flags &= ~IDE_SFLAG_SET_MULTMODE; |
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ide_tf_set_setmult_cmd(drive, &cmd.tf); |
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} else |
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BUG(); |
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|
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cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; |
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cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; |
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cmd.tf_flags = IDE_TFLAG_CUSTOM_HANDLER; |
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|
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do_rw_taskfile(drive, &cmd); |
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|
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return ide_started; |
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} |
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|
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void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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struct scatterlist *sg = hwif->sg_table, *last_sg = NULL; |
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struct request *rq = cmd->rq; |
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|
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cmd->sg_nents = __blk_rq_map_sg(drive->queue, rq, sg, &last_sg); |
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if (blk_rq_bytes(rq) && (blk_rq_bytes(rq) & rq->q->dma_pad_mask)) |
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last_sg->length += |
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(rq->q->dma_pad_mask & ~blk_rq_bytes(rq)) + 1; |
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} |
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EXPORT_SYMBOL_GPL(ide_map_sg); |
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|
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void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes) |
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{ |
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cmd->nbytes = cmd->nleft = nr_bytes; |
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cmd->cursg_ofs = 0; |
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cmd->cursg = NULL; |
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} |
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EXPORT_SYMBOL_GPL(ide_init_sg_cmd); |
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|
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/** |
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* execute_drive_command - issue special drive command |
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* @drive: the drive to issue the command on |
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* @rq: the request structure holding the command |
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* |
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* execute_drive_cmd() issues a special drive command, usually |
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* initiated by ioctl() from the external hdparm program. The |
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* command can be a drive command, drive task or taskfile |
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* operation. Weirdly you can call it with NULL to wait for |
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* all commands to finish. Don't do this as that is due to change |
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*/ |
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|
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static ide_startstop_t execute_drive_cmd (ide_drive_t *drive, |
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struct request *rq) |
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{ |
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struct ide_cmd *cmd = ide_req(rq)->special; |
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|
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if (cmd) { |
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if (cmd->protocol == ATA_PROT_PIO) { |
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ide_init_sg_cmd(cmd, blk_rq_sectors(rq) << 9); |
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ide_map_sg(drive, cmd); |
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} |
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|
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return do_rw_taskfile(drive, cmd); |
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} |
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|
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/* |
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* NULL is actually a valid way of waiting for |
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* all current requests to be flushed from the queue. |
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*/ |
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#ifdef DEBUG |
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printk("%s: DRIVE_CMD (null)\n", drive->name); |
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#endif |
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scsi_req(rq)->result = 0; |
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ide_complete_rq(drive, BLK_STS_OK, blk_rq_bytes(rq)); |
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|
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return ide_stopped; |
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} |
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|
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static ide_startstop_t ide_special_rq(ide_drive_t *drive, struct request *rq) |
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{ |
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u8 cmd = scsi_req(rq)->cmd[0]; |
|
|
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switch (cmd) { |
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case REQ_PARK_HEADS: |
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case REQ_UNPARK_HEADS: |
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return ide_do_park_unpark(drive, rq); |
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case REQ_DEVSET_EXEC: |
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return ide_do_devset(drive, rq); |
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case REQ_DRIVE_RESET: |
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return ide_do_reset(drive); |
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default: |
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BUG(); |
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} |
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} |
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|
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/** |
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* start_request - start of I/O and command issuing for IDE |
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* |
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* start_request() initiates handling of a new I/O request. It |
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* accepts commands and I/O (read/write) requests. |
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* |
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* FIXME: this function needs a rename |
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*/ |
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|
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static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq) |
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{ |
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ide_startstop_t startstop; |
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|
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#ifdef DEBUG |
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printk("%s: start_request: current=0x%08lx\n", |
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drive->hwif->name, (unsigned long) rq); |
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#endif |
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|
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/* bail early if we've exceeded max_failures */ |
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if (drive->max_failures && (drive->failures > drive->max_failures)) { |
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rq->rq_flags |= RQF_FAILED; |
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goto kill_rq; |
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} |
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|
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if (drive->prep_rq && !drive->prep_rq(drive, rq)) |
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return ide_stopped; |
|
|
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if (ata_pm_request(rq)) |
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ide_check_pm_state(drive, rq); |
|
|
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drive->hwif->tp_ops->dev_select(drive); |
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if (ide_wait_stat(&startstop, drive, drive->ready_stat, |
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ATA_BUSY | ATA_DRQ, WAIT_READY)) { |
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printk(KERN_ERR "%s: drive not ready for command\n", drive->name); |
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return startstop; |
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} |
|
|
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if (drive->special_flags == 0) { |
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struct ide_driver *drv; |
|
|
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/* |
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* We reset the drive so we need to issue a SETFEATURES. |
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* Do it _after_ do_special() restored device parameters. |
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*/ |
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if (drive->current_speed == 0xff) |
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ide_config_drive_speed(drive, drive->desired_speed); |
|
|
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if (ata_taskfile_request(rq)) |
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return execute_drive_cmd(drive, rq); |
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else if (ata_pm_request(rq)) { |
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struct ide_pm_state *pm = ide_req(rq)->special; |
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#ifdef DEBUG_PM |
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printk("%s: start_power_step(step: %d)\n", |
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drive->name, pm->pm_step); |
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#endif |
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startstop = ide_start_power_step(drive, rq); |
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if (startstop == ide_stopped && |
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pm->pm_step == IDE_PM_COMPLETED) |
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ide_complete_pm_rq(drive, rq); |
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return startstop; |
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} else if (!rq->rq_disk && ata_misc_request(rq)) |
|
/* |
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* TODO: Once all ULDs have been modified to |
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* check for specific op codes rather than |
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* blindly accepting any special request, the |
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* check for ->rq_disk above may be replaced |
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* by a more suitable mechanism or even |
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* dropped entirely. |
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*/ |
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return ide_special_rq(drive, rq); |
|
|
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drv = *(struct ide_driver **)rq->rq_disk->private_data; |
|
|
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return drv->do_request(drive, rq, blk_rq_pos(rq)); |
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} |
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return do_special(drive); |
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kill_rq: |
|
ide_kill_rq(drive, rq); |
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return ide_stopped; |
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} |
|
|
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/** |
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* ide_stall_queue - pause an IDE device |
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* @drive: drive to stall |
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* @timeout: time to stall for (jiffies) |
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* |
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* ide_stall_queue() can be used by a drive to give excess bandwidth back |
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* to the port by sleeping for timeout jiffies. |
|
*/ |
|
|
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void ide_stall_queue (ide_drive_t *drive, unsigned long timeout) |
|
{ |
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if (timeout > WAIT_WORSTCASE) |
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timeout = WAIT_WORSTCASE; |
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drive->sleep = timeout + jiffies; |
|
drive->dev_flags |= IDE_DFLAG_SLEEPING; |
|
} |
|
EXPORT_SYMBOL(ide_stall_queue); |
|
|
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static inline int ide_lock_port(ide_hwif_t *hwif) |
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{ |
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if (hwif->busy) |
|
return 1; |
|
|
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hwif->busy = 1; |
|
|
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return 0; |
|
} |
|
|
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static inline void ide_unlock_port(ide_hwif_t *hwif) |
|
{ |
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hwif->busy = 0; |
|
} |
|
|
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static inline int ide_lock_host(struct ide_host *host, ide_hwif_t *hwif) |
|
{ |
|
int rc = 0; |
|
|
|
if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
|
rc = test_and_set_bit_lock(IDE_HOST_BUSY, &host->host_busy); |
|
if (rc == 0) { |
|
if (host->get_lock) |
|
host->get_lock(ide_intr, hwif); |
|
} |
|
} |
|
return rc; |
|
} |
|
|
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static inline void ide_unlock_host(struct ide_host *host) |
|
{ |
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if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
|
if (host->release_lock) |
|
host->release_lock(); |
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clear_bit_unlock(IDE_HOST_BUSY, &host->host_busy); |
|
} |
|
} |
|
|
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void ide_requeue_and_plug(ide_drive_t *drive, struct request *rq) |
|
{ |
|
struct request_queue *q = drive->queue; |
|
|
|
/* Use 3ms as that was the old plug delay */ |
|
if (rq) { |
|
blk_mq_requeue_request(rq, false); |
|
blk_mq_delay_kick_requeue_list(q, 3); |
|
} else |
|
blk_mq_delay_run_hw_queue(q->queue_hw_ctx[0], 3); |
|
} |
|
|
|
blk_status_t ide_issue_rq(ide_drive_t *drive, struct request *rq, |
|
bool local_requeue) |
|
{ |
|
ide_hwif_t *hwif = drive->hwif; |
|
struct ide_host *host = hwif->host; |
|
ide_startstop_t startstop; |
|
|
|
if (!blk_rq_is_passthrough(rq) && !(rq->rq_flags & RQF_DONTPREP)) { |
|
rq->rq_flags |= RQF_DONTPREP; |
|
ide_req(rq)->special = NULL; |
|
} |
|
|
|
/* HLD do_request() callback might sleep, make sure it's okay */ |
|
might_sleep(); |
|
|
|
if (ide_lock_host(host, hwif)) |
|
return BLK_STS_DEV_RESOURCE; |
|
|
|
spin_lock_irq(&hwif->lock); |
|
|
|
if (!ide_lock_port(hwif)) { |
|
ide_hwif_t *prev_port; |
|
|
|
WARN_ON_ONCE(hwif->rq); |
|
repeat: |
|
prev_port = hwif->host->cur_port; |
|
if (drive->dev_flags & IDE_DFLAG_SLEEPING && |
|
time_after(drive->sleep, jiffies)) { |
|
ide_unlock_port(hwif); |
|
goto plug_device; |
|
} |
|
|
|
if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) && |
|
hwif != prev_port) { |
|
ide_drive_t *cur_dev = |
|
prev_port ? prev_port->cur_dev : NULL; |
|
|
|
/* |
|
* set nIEN for previous port, drives in the |
|
* quirk list may not like intr setups/cleanups |
|
*/ |
|
if (cur_dev && |
|
(cur_dev->dev_flags & IDE_DFLAG_NIEN_QUIRK) == 0) |
|
prev_port->tp_ops->write_devctl(prev_port, |
|
ATA_NIEN | |
|
ATA_DEVCTL_OBS); |
|
|
|
hwif->host->cur_port = hwif; |
|
} |
|
hwif->cur_dev = drive; |
|
drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED); |
|
|
|
/* |
|
* 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 blk_fetch_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... |
|
*/ |
|
if ((drive->dev_flags & IDE_DFLAG_BLOCKED) && |
|
ata_pm_request(rq) == 0 && |
|
(rq->rq_flags & RQF_PM) == 0) { |
|
/* there should be no pending command at this point */ |
|
ide_unlock_port(hwif); |
|
goto plug_device; |
|
} |
|
|
|
scsi_req(rq)->resid_len = blk_rq_bytes(rq); |
|
hwif->rq = rq; |
|
|
|
spin_unlock_irq(&hwif->lock); |
|
startstop = start_request(drive, rq); |
|
spin_lock_irq(&hwif->lock); |
|
|
|
if (startstop == ide_stopped) { |
|
rq = hwif->rq; |
|
hwif->rq = NULL; |
|
if (rq) |
|
goto repeat; |
|
ide_unlock_port(hwif); |
|
goto out; |
|
} |
|
} else { |
|
plug_device: |
|
if (local_requeue) |
|
list_add(&rq->queuelist, &drive->rq_list); |
|
spin_unlock_irq(&hwif->lock); |
|
ide_unlock_host(host); |
|
if (!local_requeue) |
|
ide_requeue_and_plug(drive, rq); |
|
return BLK_STS_OK; |
|
} |
|
|
|
out: |
|
spin_unlock_irq(&hwif->lock); |
|
if (rq == NULL) |
|
ide_unlock_host(host); |
|
return BLK_STS_OK; |
|
} |
|
|
|
/* |
|
* Issue a new request to a device. |
|
*/ |
|
blk_status_t ide_queue_rq(struct blk_mq_hw_ctx *hctx, |
|
const struct blk_mq_queue_data *bd) |
|
{ |
|
ide_drive_t *drive = hctx->queue->queuedata; |
|
ide_hwif_t *hwif = drive->hwif; |
|
|
|
spin_lock_irq(&hwif->lock); |
|
if (drive->sense_rq_active) { |
|
spin_unlock_irq(&hwif->lock); |
|
return BLK_STS_DEV_RESOURCE; |
|
} |
|
spin_unlock_irq(&hwif->lock); |
|
|
|
blk_mq_start_request(bd->rq); |
|
return ide_issue_rq(drive, bd->rq, false); |
|
} |
|
|
|
static int drive_is_ready(ide_drive_t *drive) |
|
{ |
|
ide_hwif_t *hwif = drive->hwif; |
|
u8 stat = 0; |
|
|
|
if (drive->waiting_for_dma) |
|
return hwif->dma_ops->dma_test_irq(drive); |
|
|
|
if (hwif->io_ports.ctl_addr && |
|
(hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) |
|
stat = hwif->tp_ops->read_altstatus(hwif); |
|
else |
|
/* Note: this may clear a pending IRQ!! */ |
|
stat = hwif->tp_ops->read_status(hwif); |
|
|
|
if (stat & ATA_BUSY) |
|
/* drive busy: definitely not interrupting */ |
|
return 0; |
|
|
|
/* drive ready: *might* be interrupting */ |
|
return 1; |
|
} |
|
|
|
/** |
|
* ide_timer_expiry - handle lack of an IDE interrupt |
|
* @data: timer callback magic (hwif) |
|
* |
|
* 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 (struct timer_list *t) |
|
{ |
|
ide_hwif_t *hwif = from_timer(hwif, t, timer); |
|
ide_drive_t *drive; |
|
ide_handler_t *handler; |
|
unsigned long flags; |
|
int wait = -1; |
|
int plug_device = 0; |
|
struct request *rq_in_flight; |
|
|
|
spin_lock_irqsave(&hwif->lock, flags); |
|
|
|
handler = hwif->handler; |
|
|
|
if (handler == NULL || hwif->req_gen != hwif->req_gen_timer) { |
|
/* |
|
* Either a marginal timeout occurred |
|
* (got the interrupt just as timer expired), |
|
* or we were "sleeping" to give other devices a chance. |
|
* Either way, we don't really want to complain about anything. |
|
*/ |
|
} else { |
|
ide_expiry_t *expiry = hwif->expiry; |
|
ide_startstop_t startstop = ide_stopped; |
|
|
|
drive = hwif->cur_dev; |
|
|
|
if (expiry) { |
|
wait = expiry(drive); |
|
if (wait > 0) { /* continue */ |
|
/* reset timer */ |
|
hwif->timer.expires = jiffies + wait; |
|
hwif->req_gen_timer = hwif->req_gen; |
|
add_timer(&hwif->timer); |
|
spin_unlock_irqrestore(&hwif->lock, flags); |
|
return; |
|
} |
|
} |
|
hwif->handler = NULL; |
|
hwif->expiry = 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(&hwif->lock); |
|
/* disable_irq_nosync ?? */ |
|
disable_irq(hwif->irq); |
|
|
|
if (hwif->polling) { |
|
startstop = handler(drive); |
|
} else if (drive_is_ready(drive)) { |
|
if (drive->waiting_for_dma) |
|
hwif->dma_ops->dma_lost_irq(drive); |
|
if (hwif->port_ops && hwif->port_ops->clear_irq) |
|
hwif->port_ops->clear_irq(drive); |
|
|
|
printk(KERN_WARNING "%s: lost interrupt\n", |
|
drive->name); |
|
startstop = handler(drive); |
|
} else { |
|
if (drive->waiting_for_dma) |
|
startstop = ide_dma_timeout_retry(drive, wait); |
|
else |
|
startstop = ide_error(drive, "irq timeout", |
|
hwif->tp_ops->read_status(hwif)); |
|
} |
|
/* Disable interrupts again, `handler' might have enabled it */ |
|
spin_lock_irq(&hwif->lock); |
|
enable_irq(hwif->irq); |
|
if (startstop == ide_stopped && hwif->polling == 0) { |
|
rq_in_flight = hwif->rq; |
|
hwif->rq = NULL; |
|
ide_unlock_port(hwif); |
|
plug_device = 1; |
|
} |
|
} |
|
spin_unlock_irqrestore(&hwif->lock, flags); |
|
|
|
if (plug_device) { |
|
ide_unlock_host(hwif->host); |
|
ide_requeue_and_plug(drive, rq_in_flight); |
|
} |
|
} |
|
|
|
/** |
|
* unexpected_intr - handle an unexpected IDE interrupt |
|
* @irq: interrupt line |
|
* @hwif: port 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. |
|
*/ |
|
|
|
static void unexpected_intr(int irq, ide_hwif_t *hwif) |
|
{ |
|
u8 stat = hwif->tp_ops->read_status(hwif); |
|
|
|
if (!OK_STAT(stat, ATA_DRDY, 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: unexpected interrupt, " |
|
"status=0x%02x, count=%ld\n", |
|
hwif->name, stat, count); |
|
} |
|
} |
|
} |
|
|
|
/** |
|
* ide_intr - default IDE interrupt handler |
|
* @irq: interrupt number |
|
* @dev_id: hwif |
|
* @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 |
|
* |
|
* hwif is the interface in the group currently performing |
|
* a command. hwif->cur_dev is the drive and hwif->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 port and the process begins again. |
|
*/ |
|
|
|
irqreturn_t ide_intr (int irq, void *dev_id) |
|
{ |
|
ide_hwif_t *hwif = (ide_hwif_t *)dev_id; |
|
struct ide_host *host = hwif->host; |
|
ide_drive_t *drive; |
|
ide_handler_t *handler; |
|
unsigned long flags; |
|
ide_startstop_t startstop; |
|
irqreturn_t irq_ret = IRQ_NONE; |
|
int plug_device = 0; |
|
struct request *rq_in_flight; |
|
|
|
if (host->host_flags & IDE_HFLAG_SERIALIZE) { |
|
if (hwif != host->cur_port) |
|
goto out_early; |
|
} |
|
|
|
spin_lock_irqsave(&hwif->lock, flags); |
|
|
|
if (hwif->port_ops && hwif->port_ops->test_irq && |
|
hwif->port_ops->test_irq(hwif) == 0) |
|
goto out; |
|
|
|
handler = hwif->handler; |
|
|
|
if (handler == NULL || hwif->polling) { |
|
/* |
|
* 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. |
|
*/ |
|
if ((host->irq_flags & IRQF_SHARED) == 0) { |
|
/* |
|
* Probably not a shared PCI interrupt, |
|
* so we can safely try to do something about it: |
|
*/ |
|
unexpected_intr(irq, hwif); |
|
} else { |
|
/* |
|
* Whack the status register, just in case |
|
* we have a leftover pending IRQ. |
|
*/ |
|
(void)hwif->tp_ops->read_status(hwif); |
|
} |
|
goto out; |
|
} |
|
|
|
drive = hwif->cur_dev; |
|
|
|
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. |
|
*/ |
|
goto out; |
|
|
|
hwif->handler = NULL; |
|
hwif->expiry = NULL; |
|
hwif->req_gen++; |
|
del_timer(&hwif->timer); |
|
spin_unlock(&hwif->lock); |
|
|
|
if (hwif->port_ops && hwif->port_ops->clear_irq) |
|
hwif->port_ops->clear_irq(drive); |
|
|
|
if (drive->dev_flags & IDE_DFLAG_UNMASK) |
|
local_irq_enable_in_hardirq(); |
|
|
|
/* service this interrupt, may set handler for next interrupt */ |
|
startstop = handler(drive); |
|
|
|
spin_lock_irq(&hwif->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. |
|
*/ |
|
if (startstop == ide_stopped && hwif->polling == 0) { |
|
BUG_ON(hwif->handler); |
|
rq_in_flight = hwif->rq; |
|
hwif->rq = NULL; |
|
ide_unlock_port(hwif); |
|
plug_device = 1; |
|
} |
|
irq_ret = IRQ_HANDLED; |
|
out: |
|
spin_unlock_irqrestore(&hwif->lock, flags); |
|
out_early: |
|
if (plug_device) { |
|
ide_unlock_host(hwif->host); |
|
ide_requeue_and_plug(drive, rq_in_flight); |
|
} |
|
|
|
return irq_ret; |
|
} |
|
EXPORT_SYMBOL_GPL(ide_intr); |
|
|
|
void ide_pad_transfer(ide_drive_t *drive, int write, int len) |
|
{ |
|
ide_hwif_t *hwif = drive->hwif; |
|
u8 buf[4] = { 0 }; |
|
|
|
while (len > 0) { |
|
if (write) |
|
hwif->tp_ops->output_data(drive, NULL, buf, min(4, len)); |
|
else |
|
hwif->tp_ops->input_data(drive, NULL, buf, min(4, len)); |
|
len -= 4; |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(ide_pad_transfer); |
|
|
|
void ide_insert_request_head(ide_drive_t *drive, struct request *rq) |
|
{ |
|
drive->sense_rq_active = true; |
|
list_add_tail(&rq->queuelist, &drive->rq_list); |
|
kblockd_schedule_work(&drive->rq_work); |
|
} |
|
EXPORT_SYMBOL_GPL(ide_insert_request_head);
|
|
|