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path: root/drivers/scsi/libsas/sas_init.c
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Diffstat (limited to 'drivers/scsi/libsas/sas_init.c')
-rw-r--r--drivers/scsi/libsas/sas_init.c90
1 files changed, 89 insertions, 1 deletions
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 014297c05880..dbc8a793fd86 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -178,7 +178,7 @@ Undo_phys:
return error;
}
-int sas_unregister_ha(struct sas_ha_struct *sas_ha)
+static void sas_disable_events(struct sas_ha_struct *sas_ha)
{
/* Set the state to unregistered to avoid further unchained
* events to be queued, and flush any in-progress drainers
@@ -189,7 +189,11 @@ int sas_unregister_ha(struct sas_ha_struct *sas_ha)
spin_unlock_irq(&sas_ha->lock);
__sas_drain_work(sas_ha);
mutex_unlock(&sas_ha->drain_mutex);
+}
+int sas_unregister_ha(struct sas_ha_struct *sas_ha)
+{
+ sas_disable_events(sas_ha);
sas_unregister_ports(sas_ha);
/* flush unregistration work */
@@ -381,6 +385,90 @@ int sas_set_phy_speed(struct sas_phy *phy,
return ret;
}
+void sas_prep_resume_ha(struct sas_ha_struct *ha)
+{
+ int i;
+
+ set_bit(SAS_HA_REGISTERED, &ha->state);
+
+ /* clear out any stale link events/data from the suspension path */
+ for (i = 0; i < ha->num_phys; i++) {
+ struct asd_sas_phy *phy = ha->sas_phy[i];
+
+ memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
+ phy->port_events_pending = 0;
+ phy->phy_events_pending = 0;
+ phy->frame_rcvd_size = 0;
+ }
+}
+EXPORT_SYMBOL(sas_prep_resume_ha);
+
+static int phys_suspended(struct sas_ha_struct *ha)
+{
+ int i, rc = 0;
+
+ for (i = 0; i < ha->num_phys; i++) {
+ struct asd_sas_phy *phy = ha->sas_phy[i];
+
+ if (phy->suspended)
+ rc++;
+ }
+
+ return rc;
+}
+
+void sas_resume_ha(struct sas_ha_struct *ha)
+{
+ const unsigned long tmo = msecs_to_jiffies(25000);
+ int i;
+
+ /* deform ports on phys that did not resume
+ * at this point we may be racing the phy coming back (as posted
+ * by the lldd). So we post the event and once we are in the
+ * libsas context check that the phy remains suspended before
+ * tearing it down.
+ */
+ i = phys_suspended(ha);
+ if (i)
+ dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n",
+ i, i > 1 ? "s" : "");
+ wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo);
+ for (i = 0; i < ha->num_phys; i++) {
+ struct asd_sas_phy *phy = ha->sas_phy[i];
+
+ if (phy->suspended) {
+ dev_warn(&phy->phy->dev, "resume timeout\n");
+ sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT);
+ }
+ }
+
+ /* all phys are back up or timed out, turn on i/o so we can
+ * flush out disks that did not return
+ */
+ scsi_unblock_requests(ha->core.shost);
+ sas_drain_work(ha);
+}
+EXPORT_SYMBOL(sas_resume_ha);
+
+void sas_suspend_ha(struct sas_ha_struct *ha)
+{
+ int i;
+
+ sas_disable_events(ha);
+ scsi_block_requests(ha->core.shost);
+ for (i = 0; i < ha->num_phys; i++) {
+ struct asd_sas_port *port = ha->sas_port[i];
+
+ sas_discover_event(port, DISCE_SUSPEND);
+ }
+
+ /* flush suspend events while unregistered */
+ mutex_lock(&ha->drain_mutex);
+ __sas_drain_work(ha);
+ mutex_unlock(&ha->drain_mutex);
+}
+EXPORT_SYMBOL(sas_suspend_ha);
+
static void sas_phy_release(struct sas_phy *phy)
{
kfree(phy->hostdata);