Currently, the only per-dev EH action is REVALIDATE. EH used to
exploit ehi->dev to do selective revalidation on a ATA bus. However,
this is a bit hacky and makes it impossible to request selective
revalidation from outside of EH or add another per-dev EH action.
This patch adds per-dev EH action mask eh_info->dev_action[] and
update EH to use this field for REVALIDATE. Note that per-dev actions
can still be specified at port-level and it has the same effect of
specifying the action for all devices on the port.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
Jeff, this change cleans up revalidation handling a bit and allows
later addition of per-dev ATA_EH_SPINUP EH action which is necessary
to implement per-dev PM.
drivers/scsi/libata-eh.c | 85 +++++++++++++++++++++++++++++++++++++---------
include/linux/libata.h | 2 +
2 files changed, 71 insertions(+), 16 deletions(-)
0917067a65ebaf251abf7701189bb9b1c1ef192a
diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 531a4e1..70b6239 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -706,9 +706,35 @@ static void ata_eh_detach_dev(struct ata
spin_unlock_irqrestore(&ap->host_set->lock, flags);
}
+static void ata_eh_clear_action(struct ata_device *dev,
+ struct ata_eh_info *ehi, unsigned int action)
+{
+ int i;
+
+ if (!dev) {
+ ehi->action &= ~action;
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ ehi->dev_action[i] &= ~action;
+ } else {
+ /* doesn't make sense for port-wide EH actions */
+ WARN_ON(!(action & ATA_EH_PERDEV_MASK));
+
+ /* break ehi->action into ehi->dev_action */
+ if (ehi->action & action) {
+ for (i = 0; i < ATA_MAX_DEVICES; i++)
+ ehi->dev_action[i] |= ehi->action & action;
+ ehi->action &= ~action;
+ }
+
+ /* turn off the specified per-dev action */
+ ehi->dev_action[dev->devno] &= ~action;
+ }
+}
+
/**
* ata_eh_about_to_do - about to perform eh_action
* @ap: target ATA port
+ * @dev: target ATA dev for per-dev action (can be NULL)
* @action: action about to be performed
*
* Called just before performing EH actions to clear related bits
@@ -718,17 +744,36 @@ static void ata_eh_detach_dev(struct ata
* LOCKING:
* None.
*/
-static void ata_eh_about_to_do(struct ata_port *ap, unsigned int action)
+static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
+ unsigned int action)
{
unsigned long flags;
spin_lock_irqsave(&ap->host_set->lock, flags);
- ap->eh_info.action &= ~action;
+ ata_eh_clear_action(dev, &ap->eh_info, action);
ap->flags |= ATA_FLAG_RECOVERED;
spin_unlock_irqrestore(&ap->host_set->lock, flags);
}
/**
+ * ata_eh_done - EH action complete
+ * @ap: target ATA port
+ * @dev: target ATA dev for per-dev action (can be NULL)
+ * @action: action just completed
+ *
+ * Called right after performing EH actions to clear related bits
+ * in @ap->eh_context.
+ *
+ * LOCKING:
+ * None.
+ */
+static void ata_eh_done(struct ata_port *ap, struct ata_device *dev,
+ unsigned int action)
+{
+ ata_eh_clear_action(dev, &ap->eh_context.i, action);
+}
+
+/**
* ata_err_string - convert err_mask to descriptive string
* @err_mask: error mask to convert to string
*
@@ -1271,10 +1316,6 @@ static void ata_eh_autopsy(struct ata_po
is_io = 1;
}
- /* speed down iff command was in progress */
- if (failed_dev)
- action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask);
-
/* enforce default EH actions */
if (ap->flags & ATA_FLAG_FROZEN ||
all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
@@ -1282,6 +1323,17 @@ static void ata_eh_autopsy(struct ata_po
else if (all_err_mask)
action |= ATA_EH_REVALIDATE;
+ /* if we have offending qcs and the associated failed device */
+ if (failed_dev) {
+ /* speed down */
+ action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask);
+
+ /* perform per-dev EH action only on the offending device */
+ ehc->i.dev_action[failed_dev->devno] |=
+ action & ATA_EH_PERDEV_MASK;
+ action &= ~ATA_EH_PERDEV_MASK;
+ }
+
/* record autopsy result */
ehc->i.dev = failed_dev;
ehc->i.action = action;
@@ -1457,7 +1509,7 @@ static int ata_eh_reset(struct ata_port
reset == softreset ? "soft" : "hard");
/* reset */
- ata_eh_about_to_do(ap, ATA_EH_RESET_MASK);
+ ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
ehc->i.flags |= ATA_EHI_DID_RESET;
rc = ata_do_reset(ap, reset, classes);
@@ -1476,7 +1528,7 @@ static int ata_eh_reset(struct ata_port
return -EINVAL;
}
- ata_eh_about_to_do(ap, ATA_EH_RESET_MASK);
+ ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
rc = ata_do_reset(ap, reset, classes);
if (rc == 0 && classify &&
@@ -1520,8 +1572,7 @@ static int ata_eh_reset(struct ata_port
postreset(ap, classes);
/* reset successful, schedule revalidation */
- ehc->i.dev = NULL;
- ehc->i.action &= ~ATA_EH_RESET_MASK;
+ ata_eh_done(ap, NULL, ATA_EH_RESET_MASK);
ehc->i.action |= ATA_EH_REVALIDATE;
}
@@ -1539,21 +1590,25 @@ static int ata_eh_revalidate_and_attach(
DPRINTK("ENTER\n");
for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ unsigned int action;
+
dev = &ap->device[i];
+ action = ehc->i.action | ehc->i.dev_action[dev->devno];
- if (ehc->i.action & ATA_EH_REVALIDATE && ata_dev_enabled(dev) &&
- (!ehc->i.dev || ehc->i.dev == dev)) {
+ if (action & ATA_EH_REVALIDATE && ata_dev_enabled(dev)) {
if (ata_port_offline(ap)) {
rc = -EIO;
break;
}
- ata_eh_about_to_do(ap, ATA_EH_REVALIDATE);
+ ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
rc = ata_dev_revalidate(dev,
ehc->i.flags & ATA_EHI_DID_RESET);
if (rc)
break;
+ ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
+
/* schedule the scsi_rescan_device() here */
queue_work(ata_aux_wq, &(ap->scsi_rescan_task));
} else if (dev->class == ATA_DEV_UNKNOWN &&
@@ -1576,9 +1631,7 @@ static int ata_eh_revalidate_and_attach(
}
}
- if (rc == 0)
- ehc->i.action &= ~ATA_EH_REVALIDATE;
- else
+ if (rc)
*r_failed_dev = dev;
DPRINTK("EXIT\n");
diff --git a/include/linux/libata.h b/include/linux/libata.h
index f03b866..6b3c3af 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -249,6 +249,7 @@ enum {
ATA_EH_HARDRESET = (1 << 2),
ATA_EH_RESET_MASK = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
+ ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE,
/* ata_eh_info->flags */
ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
@@ -462,6 +463,7 @@ struct ata_eh_info {
u32 serror; /* SError from LLDD */
unsigned int err_mask; /* port-wide err_mask */
unsigned int action; /* ATA_EH_* action mask */
+ unsigned int dev_action[ATA_MAX_DEVICES]; /* dev EH action */
unsigned int flags; /* ATA_EHI_* flags */
unsigned long hotplug_timestamp;
--
1.3.2
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