#include "libata.h"
+static void __ata_port_freeze(struct ata_port *ap);
+
+static void ata_ering_record(struct ata_ering *ering, int is_io,
+ unsigned int err_mask)
+{
+ struct ata_ering_entry *ent;
+
+ WARN_ON(!err_mask);
+
+ ering->cursor++;
+ ering->cursor %= ATA_ERING_SIZE;
+
+ ent = &ering->ring[ering->cursor];
+ ent->is_io = is_io;
+ ent->err_mask = err_mask;
+ ent->timestamp = get_jiffies_64();
+}
+
+static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering)
+{
+ struct ata_ering_entry *ent = &ering->ring[ering->cursor];
+ if (!ent->err_mask)
+ return NULL;
+ return ent;
+}
+
+static int ata_ering_map(struct ata_ering *ering,
+ int (*map_fn)(struct ata_ering_entry *, void *),
+ void *arg)
+{
+ int idx, rc = 0;
+ struct ata_ering_entry *ent;
+
+ idx = ering->cursor;
+ do {
+ ent = &ering->ring[idx];
+ if (!ent->err_mask)
+ break;
+ rc = map_fn(ent, arg);
+ if (rc)
+ break;
+ idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
+ } while (idx != ering->cursor);
+
+ return rc;
+}
+
/**
* ata_scsi_timed_out - SCSI layer time out callback
* @cmd: timed out SCSI command
* from finishing it by setting EH_SCHEDULED and return
* EH_NOT_HANDLED.
*
+ * TODO: kill this function once old EH is gone.
+ *
* LOCKING:
* Called from timer context
*
enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
- struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
+ struct ata_port *ap = ata_shost_to_port(host);
unsigned long flags;
struct ata_queued_cmd *qc;
- enum scsi_eh_timer_return ret = EH_HANDLED;
+ enum scsi_eh_timer_return ret;
DPRINTK("ENTER\n");
+ if (ap->ops->error_handler) {
+ ret = EH_NOT_HANDLED;
+ goto out;
+ }
+
+ ret = EH_HANDLED;
spin_lock_irqsave(&ap->host_set->lock, flags);
qc = ata_qc_from_tag(ap, ap->active_tag);
if (qc) {
}
spin_unlock_irqrestore(&ap->host_set->lock, flags);
+ out:
DPRINTK("EXIT, ret=%d\n", ret);
return ret;
}
* RETURNS:
* Zero.
*/
-int ata_scsi_error(struct Scsi_Host *host)
+void ata_scsi_error(struct Scsi_Host *host)
{
- struct ata_port *ap = (struct ata_port *)&host->hostdata[0];
+ struct ata_port *ap = ata_shost_to_port(host);
+ spinlock_t *hs_lock = &ap->host_set->lock;
+ int i, repeat_cnt = ATA_EH_MAX_REPEAT;
+ unsigned long flags;
DPRINTK("ENTER\n");
- /* synchronize with IRQ handler and port task */
- spin_unlock_wait(&ap->host_set->lock);
+ /* synchronize with port task */
ata_port_flush_task(ap);
- WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
-
- ap->ops->eng_timeout(ap);
+ /* synchronize with host_set lock and sort out timeouts */
+
+ /* For new EH, all qcs are finished in one of three ways -
+ * normal completion, error completion, and SCSI timeout.
+ * Both cmpletions can race against SCSI timeout. When normal
+ * completion wins, the qc never reaches EH. When error
+ * completion wins, the qc has ATA_QCFLAG_FAILED set.
+ *
+ * When SCSI timeout wins, things are a bit more complex.
+ * Normal or error completion can occur after the timeout but
+ * before this point. In such cases, both types of
+ * completions are honored. A scmd is determined to have
+ * timed out iff its associated qc is active and not failed.
+ */
+ if (ap->ops->error_handler) {
+ struct scsi_cmnd *scmd, *tmp;
+ int nr_timedout = 0;
+
+ spin_lock_irqsave(hs_lock, flags);
+
+ list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
+ struct ata_queued_cmd *qc;
+
+ for (i = 0; i < ATA_MAX_QUEUE; i++) {
+ qc = __ata_qc_from_tag(ap, i);
+ if (qc->flags & ATA_QCFLAG_ACTIVE &&
+ qc->scsicmd == scmd)
+ break;
+ }
+
+ if (i < ATA_MAX_QUEUE) {
+ /* the scmd has an associated qc */
+ if (!(qc->flags & ATA_QCFLAG_FAILED)) {
+ /* which hasn't failed yet, timeout */
+ qc->err_mask |= AC_ERR_TIMEOUT;
+ qc->flags |= ATA_QCFLAG_FAILED;
+ nr_timedout++;
+ }
+ } else {
+ /* Normal completion occurred after
+ * SCSI timeout but before this point.
+ * Successfully complete it.
+ */
+ scmd->retries = scmd->allowed;
+ scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
+ }
+ }
+
+ /* If we have timed out qcs. They belong to EH from
+ * this point but the state of the controller is
+ * unknown. Freeze the port to make sure the IRQ
+ * handler doesn't diddle with those qcs. This must
+ * be done atomically w.r.t. setting QCFLAG_FAILED.
+ */
+ if (nr_timedout)
+ __ata_port_freeze(ap);
+
+ spin_unlock_irqrestore(hs_lock, flags);
+ } else
+ spin_unlock_wait(hs_lock);
+
+ repeat:
+ /* invoke error handler */
+ if (ap->ops->error_handler) {
+ /* fetch & clear EH info */
+ spin_lock_irqsave(hs_lock, flags);
+
+ memset(&ap->eh_context, 0, sizeof(ap->eh_context));
+ ap->eh_context.i = ap->eh_info;
+ memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+ ap->flags &= ~ATA_FLAG_EH_PENDING;
+
+ spin_unlock_irqrestore(hs_lock, flags);
+
+ /* invoke EH */
+ ap->ops->error_handler(ap);
+
+ /* Exception might have happend after ->error_handler
+ * recovered the port but before this point. Repeat
+ * EH in such case.
+ */
+ spin_lock_irqsave(hs_lock, flags);
+
+ if (ap->flags & ATA_FLAG_EH_PENDING) {
+ if (--repeat_cnt) {
+ ata_port_printk(ap, KERN_INFO,
+ "EH pending after completion, "
+ "repeating EH (cnt=%d)\n", repeat_cnt);
+ spin_unlock_irqrestore(hs_lock, flags);
+ goto repeat;
+ }
+ ata_port_printk(ap, KERN_ERR, "EH pending after %d "
+ "tries, giving up\n", ATA_EH_MAX_REPEAT);
+ }
+
+ /* this run is complete, make sure EH info is clear */
+ memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+ /* Clear host_eh_scheduled while holding hs_lock such
+ * that if exception occurs after this point but
+ * before EH completion, SCSI midlayer will
+ * re-initiate EH.
+ */
+ host->host_eh_scheduled = 0;
+
+ spin_unlock_irqrestore(hs_lock, flags);
+ } else {
+ WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
+ ap->ops->eng_timeout(ap);
+ }
+ /* finish or retry handled scmd's and clean up */
WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
scsi_eh_flush_done_q(&ap->eh_done_q);
+ /* clean up */
+ spin_lock_irqsave(hs_lock, flags);
+
+ if (ap->flags & ATA_FLAG_RECOVERED)
+ ata_port_printk(ap, KERN_INFO, "EH complete\n");
+ ap->flags &= ~ATA_FLAG_RECOVERED;
+
+ spin_unlock_irqrestore(hs_lock, flags);
+
DPRINTK("EXIT\n");
- return 0;
}
/**
* 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)
*/
/* ack bmdma irq events */
ap->ops->irq_clear(ap);
- printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
- ap->id, qc->tf.command, drv_stat, host_stat);
+ 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_mask(drv_stat);
* 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)
*/
DPRINTK("EXIT\n");
}
+/**
+ * ata_qc_schedule_eh - schedule qc for error handling
+ * @qc: command to schedule error handling for
+ *
+ * Schedule error handling for @qc. EH will kick in as soon as
+ * other commands are drained.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+
+ WARN_ON(!ap->ops->error_handler);
+
+ qc->flags |= ATA_QCFLAG_FAILED;
+ qc->ap->flags |= ATA_FLAG_EH_PENDING;
+
+ /* The following will fail if timeout has already expired.
+ * ata_scsi_error() takes care of such scmds on EH entry.
+ * Note that ATA_QCFLAG_FAILED is unconditionally set after
+ * this function completes.
+ */
+ scsi_req_abort_cmd(qc->scsicmd);
+}
+
+/**
+ * ata_port_schedule_eh - schedule error handling without a qc
+ * @ap: ATA port to schedule EH for
+ *
+ * Schedule error handling for @ap. EH will kick in as soon as
+ * all commands are drained.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ */
+void ata_port_schedule_eh(struct ata_port *ap)
+{
+ WARN_ON(!ap->ops->error_handler);
+
+ ap->flags |= ATA_FLAG_EH_PENDING;
+ ata_schedule_scsi_eh(ap->host);
+
+ DPRINTK("port EH scheduled\n");
+}
+
+/**
+ * ata_port_abort - abort all qc's on the port
+ * @ap: ATA port to abort qc's for
+ *
+ * Abort all active qc's of @ap and schedule EH.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ *
+ * RETURNS:
+ * Number of aborted qc's.
+ */
+int ata_port_abort(struct ata_port *ap)
+{
+ int tag, nr_aborted = 0;
+
+ WARN_ON(!ap->ops->error_handler);
+
+ for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+ struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
+
+ if (qc) {
+ qc->flags |= ATA_QCFLAG_FAILED;
+ ata_qc_complete(qc);
+ nr_aborted++;
+ }
+ }
+
+ if (!nr_aborted)
+ ata_port_schedule_eh(ap);
+
+ return nr_aborted;
+}
+
+/**
+ * __ata_port_freeze - freeze port
+ * @ap: ATA port to freeze
+ *
+ * This function is called when HSM violation or some other
+ * condition disrupts normal operation of the port. Frozen port
+ * is not allowed to perform any operation until the port is
+ * thawed, which usually follows a successful reset.
+ *
+ * ap->ops->freeze() callback can be used for freezing the port
+ * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
+ * port cannot be frozen hardware-wise, the interrupt handler
+ * must ack and clear interrupts unconditionally while the port
+ * is frozen.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ */
+static void __ata_port_freeze(struct ata_port *ap)
+{
+ WARN_ON(!ap->ops->error_handler);
+
+ if (ap->ops->freeze)
+ ap->ops->freeze(ap);
+
+ ap->flags |= ATA_FLAG_FROZEN;
+
+ DPRINTK("ata%u port frozen\n", ap->id);
+}
+
+/**
+ * ata_port_freeze - abort & freeze port
+ * @ap: ATA port to freeze
+ *
+ * Abort and freeze @ap.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ *
+ * RETURNS:
+ * Number of aborted commands.
+ */
+int ata_port_freeze(struct ata_port *ap)
+{
+ int nr_aborted;
+
+ WARN_ON(!ap->ops->error_handler);
+
+ nr_aborted = ata_port_abort(ap);
+ __ata_port_freeze(ap);
+
+ return nr_aborted;
+}
+
+/**
+ * ata_eh_freeze_port - EH helper to freeze port
+ * @ap: ATA port to freeze
+ *
+ * Freeze @ap.
+ *
+ * LOCKING:
+ * None.
+ */
+void ata_eh_freeze_port(struct ata_port *ap)
+{
+ unsigned long flags;
+
+ if (!ap->ops->error_handler)
+ return;
+
+ spin_lock_irqsave(&ap->host_set->lock, flags);
+ __ata_port_freeze(ap);
+ spin_unlock_irqrestore(&ap->host_set->lock, flags);
+}
+
+/**
+ * ata_port_thaw_port - EH helper to thaw port
+ * @ap: ATA port to thaw
+ *
+ * Thaw frozen port @ap.
+ *
+ * LOCKING:
+ * None.
+ */
+void ata_eh_thaw_port(struct ata_port *ap)
+{
+ unsigned long flags;
+
+ if (!ap->ops->error_handler)
+ return;
+
+ spin_lock_irqsave(&ap->host_set->lock, flags);
+
+ ap->flags &= ~ATA_FLAG_FROZEN;
+
+ if (ap->ops->thaw)
+ ap->ops->thaw(ap);
+
+ spin_unlock_irqrestore(&ap->host_set->lock, flags);
+
+ DPRINTK("ata%u port thawed\n", ap->id);
+}
+
static void ata_eh_scsidone(struct scsi_cmnd *scmd)
{
/* nada */
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