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