// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/ide.h>
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#include <linux/delay.h>
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static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq,
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u8 stat, u8 err)
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{
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ide_hwif_t *hwif = drive->hwif;
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if ((stat & ATA_BUSY) ||
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((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
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/* other bits are useless when BUSY */
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scsi_req(rq)->result |= ERROR_RESET;
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} else if (stat & ATA_ERR) {
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/* err has different meaning on cdrom and tape */
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if (err == ATA_ABORTED) {
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if ((drive->dev_flags & IDE_DFLAG_LBA) &&
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/* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */
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hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS)
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return ide_stopped;
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} else if ((err & BAD_CRC) == BAD_CRC) {
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/* UDMA crc error, just retry the operation */
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drive->crc_count++;
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} else if (err & (ATA_BBK | ATA_UNC)) {
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/* retries won't help these */
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scsi_req(rq)->result = ERROR_MAX;
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} else if (err & ATA_TRK0NF) {
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/* help it find track zero */
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scsi_req(rq)->result |= ERROR_RECAL;
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}
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}
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if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ &&
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(hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) {
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int nsect = drive->mult_count ? drive->mult_count : 1;
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ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE);
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}
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if (scsi_req(rq)->result >= ERROR_MAX || blk_noretry_request(rq)) {
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ide_kill_rq(drive, rq);
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return ide_stopped;
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}
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if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
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scsi_req(rq)->result |= ERROR_RESET;
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if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) {
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++scsi_req(rq)->result;
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return ide_do_reset(drive);
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}
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if ((scsi_req(rq)->result & ERROR_RECAL) == ERROR_RECAL)
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drive->special_flags |= IDE_SFLAG_RECALIBRATE;
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++scsi_req(rq)->result;
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return ide_stopped;
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}
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static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq,
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u8 stat, u8 err)
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{
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ide_hwif_t *hwif = drive->hwif;
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if ((stat & ATA_BUSY) ||
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((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) {
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/* other bits are useless when BUSY */
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scsi_req(rq)->result |= ERROR_RESET;
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} else {
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/* add decoding error stuff */
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}
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if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
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/* force an abort */
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hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
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if (scsi_req(rq)->result >= ERROR_MAX) {
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ide_kill_rq(drive, rq);
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} else {
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if ((scsi_req(rq)->result & ERROR_RESET) == ERROR_RESET) {
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++scsi_req(rq)->result;
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return ide_do_reset(drive);
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}
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++scsi_req(rq)->result;
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}
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return ide_stopped;
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}
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static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq,
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u8 stat, u8 err)
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{
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if (drive->media == ide_disk)
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return ide_ata_error(drive, rq, stat, err);
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return ide_atapi_error(drive, rq, stat, err);
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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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struct request *rq;
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u8 err;
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err = ide_dump_status(drive, msg, stat);
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rq = drive->hwif->rq;
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if (rq == NULL)
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return ide_stopped;
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/* retry only "normal" I/O: */
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if (blk_rq_is_passthrough(rq)) {
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if (ata_taskfile_request(rq)) {
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struct ide_cmd *cmd = ide_req(rq)->special;
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if (cmd)
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ide_complete_cmd(drive, cmd, stat, err);
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} else if (ata_pm_request(rq)) {
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scsi_req(rq)->result = 1;
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ide_complete_pm_rq(drive, rq);
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return ide_stopped;
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}
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scsi_req(rq)->result = err;
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ide_complete_rq(drive, err ? BLK_STS_IOERR : BLK_STS_OK, blk_rq_bytes(rq));
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return ide_stopped;
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}
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return __ide_error(drive, rq, stat, err);
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}
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EXPORT_SYMBOL_GPL(ide_error);
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static inline void ide_complete_drive_reset(ide_drive_t *drive, blk_status_t err)
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{
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struct request *rq = drive->hwif->rq;
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if (rq && ata_misc_request(rq) &&
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scsi_req(rq)->cmd[0] == REQ_DRIVE_RESET) {
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if (err <= 0 && scsi_req(rq)->result == 0)
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scsi_req(rq)->result = -EIO;
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ide_complete_rq(drive, err, blk_rq_bytes(rq));
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}
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}
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/* needed below */
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static ide_startstop_t do_reset1(ide_drive_t *, int);
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/*
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* atapi_reset_pollfunc() gets invoked to poll the interface for completion
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* every 50ms during an atapi drive reset operation. If the drive has not yet
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* responded, and we have not yet hit our maximum waiting time, then the timer
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* is restarted for another 50ms.
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*/
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static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive)
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{
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ide_hwif_t *hwif = drive->hwif;
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const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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u8 stat;
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tp_ops->dev_select(drive);
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udelay(10);
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stat = tp_ops->read_status(hwif);
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if (OK_STAT(stat, 0, ATA_BUSY))
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printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name);
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else {
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if (time_before(jiffies, hwif->poll_timeout)) {
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ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
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/* continue polling */
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return ide_started;
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}
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/* end of polling */
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hwif->polling = 0;
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printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n",
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drive->name, stat);
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/* do it the old fashioned way */
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return do_reset1(drive, 1);
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}
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/* done polling */
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hwif->polling = 0;
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ide_complete_drive_reset(drive, BLK_STS_OK);
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return ide_stopped;
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}
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static void ide_reset_report_error(ide_hwif_t *hwif, u8 err)
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{
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static const char *err_master_vals[] =
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{ NULL, "passed", "formatter device error",
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"sector buffer error", "ECC circuitry error",
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"controlling MPU error" };
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u8 err_master = err & 0x7f;
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printk(KERN_ERR "%s: reset: master: ", hwif->name);
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if (err_master && err_master < 6)
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printk(KERN_CONT "%s", err_master_vals[err_master]);
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else
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printk(KERN_CONT "error (0x%02x?)", err);
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if (err & 0x80)
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printk(KERN_CONT "; slave: failed");
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printk(KERN_CONT "\n");
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}
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/*
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* reset_pollfunc() gets invoked to poll the interface for completion every 50ms
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* during an ide reset operation. If the drives have not yet responded,
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* and we have not yet hit our maximum waiting time, then the timer is restarted
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* for another 50ms.
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*/
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static ide_startstop_t reset_pollfunc(ide_drive_t *drive)
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{
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ide_hwif_t *hwif = drive->hwif;
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const struct ide_port_ops *port_ops = hwif->port_ops;
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u8 tmp;
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blk_status_t err = BLK_STS_OK;
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if (port_ops && port_ops->reset_poll) {
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err = port_ops->reset_poll(drive);
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if (err) {
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printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
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hwif->name, drive->name);
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goto out;
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}
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}
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tmp = hwif->tp_ops->read_status(hwif);
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if (!OK_STAT(tmp, 0, ATA_BUSY)) {
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if (time_before(jiffies, hwif->poll_timeout)) {
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ide_set_handler(drive, &reset_pollfunc, HZ/20);
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/* continue polling */
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return ide_started;
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}
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printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n",
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hwif->name, tmp);
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drive->failures++;
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err = BLK_STS_IOERR;
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} else {
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tmp = ide_read_error(drive);
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if (tmp == 1) {
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printk(KERN_INFO "%s: reset: success\n", hwif->name);
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drive->failures = 0;
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} else {
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ide_reset_report_error(hwif, tmp);
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drive->failures++;
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err = BLK_STS_IOERR;
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}
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}
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out:
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hwif->polling = 0; /* done polling */
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ide_complete_drive_reset(drive, err);
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return ide_stopped;
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}
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static void ide_disk_pre_reset(ide_drive_t *drive)
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{
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int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;
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drive->special_flags =
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legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0;
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drive->mult_count = 0;
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drive->dev_flags &= ~IDE_DFLAG_PARKED;
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if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
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(drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
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drive->mult_req = 0;
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if (drive->mult_req != drive->mult_count)
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drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
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}
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static void pre_reset(ide_drive_t *drive)
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{
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const struct ide_port_ops *port_ops = drive->hwif->port_ops;
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if (drive->media == ide_disk)
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ide_disk_pre_reset(drive);
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else
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drive->dev_flags |= IDE_DFLAG_POST_RESET;
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if (drive->dev_flags & IDE_DFLAG_USING_DMA) {
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if (drive->crc_count)
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ide_check_dma_crc(drive);
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else
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ide_dma_off(drive);
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}
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if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) {
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if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) {
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drive->dev_flags &= ~IDE_DFLAG_UNMASK;
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drive->io_32bit = 0;
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}
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return;
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}
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if (port_ops && port_ops->pre_reset)
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port_ops->pre_reset(drive);
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if (drive->current_speed != 0xff)
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drive->desired_speed = drive->current_speed;
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drive->current_speed = 0xff;
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}
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/*
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* do_reset1() attempts to recover a confused drive by resetting it.
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* Unfortunately, resetting a disk drive actually resets all devices on
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* the same interface, so it can really be thought of as resetting the
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* interface rather than resetting the drive.
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*
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* ATAPI devices have their own reset mechanism which allows them to be
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* individually reset without clobbering other devices on the same interface.
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*
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* Unfortunately, the IDE interface does not generate an interrupt to let
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* us know when the reset operation has finished, so we must poll for this.
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* Equally poor, though, is the fact that this may a very long time to complete,
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* (up to 30 seconds worstcase). So, instead of busy-waiting here for it,
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* we set a timer to poll at 50ms intervals.
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*/
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static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct ide_io_ports *io_ports = &hwif->io_ports;
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const struct ide_tp_ops *tp_ops = hwif->tp_ops;
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const struct ide_port_ops *port_ops;
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ide_drive_t *tdrive;
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unsigned long flags, timeout;
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int i;
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DEFINE_WAIT(wait);
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spin_lock_irqsave(&hwif->lock, flags);
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/* We must not reset with running handlers */
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BUG_ON(hwif->handler != NULL);
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/* For an ATAPI device, first try an ATAPI SRST. */
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if (drive->media != ide_disk && !do_not_try_atapi) {
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pre_reset(drive);
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tp_ops->dev_select(drive);
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udelay(20);
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tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
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ndelay(400);
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hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
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hwif->polling = 1;
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__ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20);
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spin_unlock_irqrestore(&hwif->lock, flags);
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return ide_started;
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}
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/* We must not disturb devices in the IDE_DFLAG_PARKED state. */
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do {
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unsigned long now;
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prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
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timeout = jiffies;
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ide_port_for_each_present_dev(i, tdrive, hwif) {
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if ((tdrive->dev_flags & IDE_DFLAG_PARKED) &&
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time_after(tdrive->sleep, timeout))
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timeout = tdrive->sleep;
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}
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now = jiffies;
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if (time_before_eq(timeout, now))
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break;
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spin_unlock_irqrestore(&hwif->lock, flags);
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timeout = schedule_timeout_uninterruptible(timeout - now);
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spin_lock_irqsave(&hwif->lock, flags);
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} while (timeout);
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finish_wait(&ide_park_wq, &wait);
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/*
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* First, reset any device state data we were maintaining
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* for any of the drives on this interface.
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*/
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ide_port_for_each_dev(i, tdrive, hwif)
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pre_reset(tdrive);
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if (io_ports->ctl_addr == 0) {
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spin_unlock_irqrestore(&hwif->lock, flags);
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ide_complete_drive_reset(drive, BLK_STS_IOERR);
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return ide_stopped;
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}
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/*
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* Note that we also set nIEN while resetting the device,
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* to mask unwanted interrupts from the interface during the reset.
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* However, due to the design of PC hardware, this will cause an
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* immediate interrupt due to the edge transition it produces.
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* This single interrupt gives us a "fast poll" for drives that
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* recover from reset very quickly, saving us the first 50ms wait time.
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*/
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/* set SRST and nIEN */
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tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS);
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/* more than enough time */
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udelay(10);
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/* clear SRST, leave nIEN (unless device is on the quirk list) */
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tp_ops->write_devctl(hwif,
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((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) |
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ATA_DEVCTL_OBS);
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/* more than enough time */
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udelay(10);
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hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
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hwif->polling = 1;
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__ide_set_handler(drive, &reset_pollfunc, HZ/20);
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/*
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* Some weird controller like resetting themselves to a strange
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* state when the disks are reset this way. At least, the Winbond
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* 553 documentation says that
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*/
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port_ops = hwif->port_ops;
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if (port_ops && port_ops->resetproc)
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port_ops->resetproc(drive);
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spin_unlock_irqrestore(&hwif->lock, flags);
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return ide_started;
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}
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/*
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* ide_do_reset() is the entry point to the drive/interface reset code.
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*/
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ide_startstop_t ide_do_reset(ide_drive_t *drive)
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{
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return do_reset1(drive, 0);
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}
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EXPORT_SYMBOL(ide_do_reset);
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