--- /dev/null
+
+#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 */
+ rq->errors |= 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 */
+ rq->errors = ERROR_MAX;
+ } else if (err & ATA_TRK0NF) {
+ /* help it find track zero */
+ rq->errors |= 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 (rq->errors >= 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))
+ rq->errors |= ERROR_RESET;
+
+ if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
+ ++rq->errors;
+ return ide_do_reset(drive);
+ }
+
+ if ((rq->errors & ERROR_RECAL) == ERROR_RECAL)
+ drive->special_flags |= IDE_SFLAG_RECALIBRATE;
+
+ ++rq->errors;
+
+ 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 */
+ rq->errors |= 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 (rq->errors >= ERROR_MAX) {
+ ide_kill_rq(drive, rq);
+ } else {
+ if ((rq->errors & ERROR_RESET) == ERROR_RESET) {
+ ++rq->errors;
+ return ide_do_reset(drive);
+ }
+ ++rq->errors;
+ }
+
+ 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 (rq->cmd_type != REQ_TYPE_FS) {
+ if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
+ struct ide_cmd *cmd = rq->special;
+
+ if (cmd)
+ ide_complete_cmd(drive, cmd, stat, err);
+ } else if (blk_pm_request(rq)) {
+ rq->errors = 1;
+ ide_complete_pm_rq(drive, rq);
+ return ide_stopped;
+ }
+ rq->errors = err;
+ ide_complete_rq(drive, err ? -EIO : 0, 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, int err)
+{
+ struct request *rq = drive->hwif->rq;
+
+ if (rq && rq->cmd_type == REQ_TYPE_SPECIAL &&
+ rq->cmd[0] == REQ_DRIVE_RESET) {
+ if (err <= 0 && rq->errors == 0)
+ rq->errors = -EIO;
+ ide_complete_rq(drive, err ? err : 0, 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, 0);
+ 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;
+ int err = 0;
+
+ 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 = -EIO;
+ } 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 = -EIO;
+ }
+ }
+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, -ENXIO);
+ 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);
Code Review / kvmfornfv.git / blobdiff