}
}
-/**
- * ata_qc_timeout - Handle timeout of queued command
- * @qc: Command that timed out
- *
- * Some part of the kernel (currently, only the SCSI layer)
- * has noticed that the active command on port @ap has not
- * completed after a specified length of time. Handle this
- * condition by disabling DMA (if necessary) and completing
- * transactions, with error if necessary.
- *
- * This also handles the case of the "lost interrupt", where
- * for some reason (possibly hardware bug, possibly driver bug)
- * an interrupt was not delivered to the driver, even though the
- * transaction completed successfully.
- *
- * TODO: kill this function once old EH is gone.
- *
- * LOCKING:
- * Inherited from SCSI layer (none, can sleep)
- */
-static void ata_qc_timeout(struct ata_queued_cmd *qc)
-{
- struct ata_port *ap = qc->ap;
- u8 host_stat = 0, drv_stat;
- unsigned long flags;
-
- DPRINTK("ENTER\n");
-
- ap->hsm_task_state = HSM_ST_IDLE;
-
- spin_lock_irqsave(ap->lock, flags);
-
- switch (qc->tf.protocol) {
-
- case ATA_PROT_DMA:
- case ATA_PROT_ATAPI_DMA:
- host_stat = ap->ops->bmdma_status(ap);
-
- /* before we do anything else, clear DMA-Start bit */
- ap->ops->bmdma_stop(qc);
-
- /* fall through */
-
- default:
- ata_altstatus(ap);
- drv_stat = ata_chk_status(ap);
-
- /* ack bmdma irq events */
- ap->ops->irq_clear(ap);
-
- ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, "
- "stat 0x%x host_stat 0x%x\n",
- qc->tf.command, drv_stat, host_stat);
-
- /* complete taskfile transaction */
- qc->err_mask |= AC_ERR_TIMEOUT;
- break;
- }
-
- spin_unlock_irqrestore(ap->lock, flags);
-
- ata_eh_qc_complete(qc);
-
- DPRINTK("EXIT\n");
-}
-
-/**
- * ata_eng_timeout - Handle timeout of queued command
- * @ap: Port on which timed-out command is active
- *
- * Some part of the kernel (currently, only the SCSI layer)
- * has noticed that the active command on port @ap has not
- * completed after a specified length of time. Handle this
- * condition by disabling DMA (if necessary) and completing
- * transactions, with error if necessary.
- *
- * This also handles the case of the "lost interrupt", where
- * for some reason (possibly hardware bug, possibly driver bug)
- * an interrupt was not delivered to the driver, even though the
- * transaction completed successfully.
- *
- * TODO: kill this function once old EH is gone.
- *
- * LOCKING:
- * Inherited from SCSI layer (none, can sleep)
- */
-void ata_eng_timeout(struct ata_port *ap)
-{
- DPRINTK("ENTER\n");
-
- ata_qc_timeout(ata_qc_from_tag(ap, ap->link.active_tag));
-
- DPRINTK("EXIT\n");
-}
-
static int ata_eh_nr_in_flight(struct ata_port *ap)
{
unsigned int tag;
{
struct ata_port *ap = link->ap;
struct ata_eh_context *ehc = &link->eh_context;
+ struct ata_device *dev;
unsigned int all_err_mask = 0;
int tag, is_io = 0;
u32 serror;
(!is_io && (all_err_mask & ~AC_ERR_DEV)))
ehc->i.action |= ATA_EH_REVALIDATE;
- /* if we have offending qcs and the associated failed device */
+ /* If we have offending qcs and the associated failed device,
+ * perform per-dev EH action only on the offending device.
+ */
if (ehc->i.dev) {
- /* speed down */
- ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io,
- all_err_mask);
-
- /* perform per-dev EH action only on the offending device */
ehc->i.dev_action[ehc->i.dev->devno] |=
ehc->i.action & ATA_EH_PERDEV_MASK;
ehc->i.action &= ~ATA_EH_PERDEV_MASK;
}
+ /* consider speeding down */
+ dev = ehc->i.dev;
+ if (!dev && ata_link_max_devices(link) == 1 &&
+ ata_dev_enabled(link->device))
+ dev = link->device;
+
+ if (dev)
+ ehc->i.action |= ata_eh_speed_down(dev, is_io, all_err_mask);
+
DPRINTK("EXIT\n");
}
ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
{
+ const int max_tries = ARRAY_SIZE(ata_eh_reset_timeouts);
struct ata_port *ap = link->ap;
struct ata_eh_context *ehc = &link->eh_context;
unsigned int *classes = ehc->classes;
+ unsigned int lflags = link->flags;
int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
int try = 0;
struct ata_device *dev;
- unsigned long deadline;
+ unsigned long deadline, now;
unsigned int tmp_action;
ata_reset_fn_t reset;
unsigned long flags;
+ u32 sstatus;
int rc;
/* about to reset */
/* Determine which reset to use and record in ehc->i.action.
* prereset() may examine and modify it.
*/
- if (softreset && (!hardreset || (!(link->flags & ATA_LFLAG_NO_SRST) &&
+ if (softreset && (!hardreset || (!(lflags & ATA_LFLAG_NO_SRST) &&
!sata_set_spd_needed(link) &&
!(ehc->i.action & ATA_EH_HARDRESET))))
tmp_action = ATA_EH_SOFTRESET;
"follow-up softreset required "
"but no softreset avaliable\n");
rc = -EINVAL;
- goto out;
+ goto fail;
}
ata_eh_about_to_do(link, NULL, ATA_EH_RESET_MASK);
rc = ata_do_reset(link, reset, classes, deadline);
-
- if (rc == 0 && classify && classes[0] == ATA_DEV_UNKNOWN &&
- !(link->flags & ATA_LFLAG_ASSUME_CLASS)) {
- ata_link_printk(link, KERN_ERR,
- "classification failed\n");
- rc = -EINVAL;
- goto out;
- }
}
- /* if we skipped follow-up srst, clear rc */
- if (rc == -EAGAIN)
- rc = 0;
-
- if (rc && rc != -ERESTART && try < ARRAY_SIZE(ata_eh_reset_timeouts)) {
- unsigned long now = jiffies;
-
- if (time_before(now, deadline)) {
- unsigned long delta = deadline - jiffies;
-
- ata_link_printk(link, KERN_WARNING, "reset failed "
- "(errno=%d), retrying in %u secs\n",
- rc, (jiffies_to_msecs(delta) + 999) / 1000);
+ /* -EAGAIN can happen if we skipped followup SRST */
+ if (rc && rc != -EAGAIN)
+ goto fail;
- while (delta)
- delta = schedule_timeout_uninterruptible(delta);
+ /* was classification successful? */
+ if (classify && classes[0] == ATA_DEV_UNKNOWN &&
+ !(lflags & ATA_LFLAG_ASSUME_CLASS)) {
+ if (try < max_tries) {
+ ata_link_printk(link, KERN_WARNING,
+ "classification failed\n");
+ rc = -EINVAL;
+ goto fail;
}
- if (rc == -EPIPE ||
- try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1)
- sata_down_spd_limit(link);
- if (hardreset)
- reset = hardreset;
- goto retry;
+ ata_link_printk(link, KERN_WARNING,
+ "classfication failed, assuming ATA\n");
+ lflags |= ATA_LFLAG_ASSUME_ATA;
}
- if (rc == 0) {
- u32 sstatus;
+ ata_link_for_each_dev(dev, link) {
+ /* After the reset, the device state is PIO 0 and the
+ * controller state is undefined. Reset also wakes up
+ * drives from sleeping mode.
+ */
+ dev->pio_mode = XFER_PIO_0;
+ dev->flags &= ~ATA_DFLAG_SLEEPING;
- ata_link_for_each_dev(dev, link) {
- /* After the reset, the device state is PIO 0
- * and the controller state is undefined.
- * Reset also wakes up drives from sleeping
- * mode.
- */
- dev->pio_mode = XFER_PIO_0;
- dev->flags &= ~ATA_DFLAG_SLEEPING;
+ if (ata_link_offline(link))
+ continue;
- if (ata_link_offline(link))
- continue;
+ /* apply class override and convert UNKNOWN to NONE */
+ if (lflags & ATA_LFLAG_ASSUME_ATA)
+ classes[dev->devno] = ATA_DEV_ATA;
+ else if (lflags & ATA_LFLAG_ASSUME_SEMB)
+ classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
+ else if (classes[dev->devno] == ATA_DEV_UNKNOWN)
+ classes[dev->devno] = ATA_DEV_NONE;
+ }
- /* apply class override and convert UNKNOWN to NONE */
- if (link->flags & ATA_LFLAG_ASSUME_ATA)
- classes[dev->devno] = ATA_DEV_ATA;
- else if (link->flags & ATA_LFLAG_ASSUME_SEMB)
- classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
- else if (classes[dev->devno] == ATA_DEV_UNKNOWN)
- classes[dev->devno] = ATA_DEV_NONE;
- }
+ /* record current link speed */
+ if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
+ link->sata_spd = (sstatus >> 4) & 0xf;
- /* record current link speed */
- if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
- link->sata_spd = (sstatus >> 4) & 0xf;
+ if (postreset)
+ postreset(link, classes);
- if (postreset)
- postreset(link, classes);
+ /* reset successful, schedule revalidation */
+ ata_eh_done(link, NULL, ehc->i.action & ATA_EH_RESET_MASK);
+ ehc->i.action |= ATA_EH_REVALIDATE;
- /* reset successful, schedule revalidation */
- ata_eh_done(link, NULL, ehc->i.action & ATA_EH_RESET_MASK);
- ehc->i.action |= ATA_EH_REVALIDATE;
- }
+ rc = 0;
out:
/* clear hotplug flag */
ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
spin_unlock_irqrestore(ap->lock, flags);
return rc;
+
+ fail:
+ if (rc == -ERESTART || try >= max_tries)
+ goto out;
+
+ now = jiffies;
+ if (time_before(now, deadline)) {
+ unsigned long delta = deadline - now;
+
+ ata_link_printk(link, KERN_WARNING, "reset failed "
+ "(errno=%d), retrying in %u secs\n",
+ rc, (jiffies_to_msecs(delta) + 999) / 1000);
+
+ while (delta)
+ delta = schedule_timeout_uninterruptible(delta);
+ }
+
+ if (rc == -EPIPE || try == max_tries - 1)
+ sata_down_spd_limit(link);
+ if (hardreset)
+ reset = hardreset;
+ goto retry;
}
static int ata_eh_revalidate_and_attach(struct ata_link *link,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff