8 files changed, 74 insertions, 3 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index a9b282038000..c61316e9d2f7 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -863,6 +863,7 @@ void ata_port_wait_eh(struct ata_port *ap)
                 goto retry;
         }
 }
+EXPORT_SYMBOL_GPL(ata_port_wait_eh);
 
 static int ata_eh_nr_in_flight(struct ata_port *ap)
 {
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 814486d35c44..1fab235ee516 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -151,7 +151,6 @@ extern void ata_eh_acquire(struct ata_port *ap);
 extern void ata_eh_release(struct ata_port *ap);
 extern enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
 extern void ata_scsi_error(struct Scsi_Host *host);
-extern void ata_port_wait_eh(struct ata_port *ap);
 extern void ata_eh_fastdrain_timerfn(unsigned long arg);
 extern void ata_qc_schedule_eh(struct ata_queued_cmd *qc);
 extern void ata_dev_disable(struct ata_device *dev);
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 48cadf88c399..03930a04a679 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -698,3 +698,14 @@ void sas_ata_schedule_reset(struct domain_device *dev)
         ata_port_schedule_eh(ap);
         spin_unlock_irqrestore(ap->lock, flags);
 }
+
+void sas_ata_wait_eh(struct domain_device *dev)
+{
+        struct ata_port *ap;
+
+        if (!dev_is_sata(dev))
+                return;
+
+        ap = dev->sata_dev.ap;
+        ata_port_wait_eh(ap);
+}
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index f4894b0f537b..d3c1a29b8a2a 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -228,7 +228,7 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 }
 
 /* check if we have an existing attached ata device on this expander phy */
-static struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
+struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
 {
         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
         struct domain_device *dev;
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index cb65adf4ab16..a15fb861daba 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -28,6 +28,7 @@
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/spinlock.h>
+#include <scsi/sas_ata.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_transport.h>
@@ -195,6 +196,59 @@ static int sas_get_linkerrors(struct sas_phy *phy)
         return sas_smp_get_phy_events(phy);
 }
 
+/**
+ * transport_sas_phy_reset - reset a phy and permit libata to manage the link
+ *
+ * phy reset request via sysfs in host workqueue context so we know we
+ * can block on eh and safely traverse the domain_device topology
+ */
+static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset)
+{
+        int ret;
+        enum phy_func reset_type;
+
+        if (hard_reset)
+                reset_type = PHY_FUNC_HARD_RESET;
+        else
+                reset_type = PHY_FUNC_LINK_RESET;
+
+        if (scsi_is_sas_phy_local(phy)) {
+                struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+                struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
+                struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
+                struct sas_internal *i =
+                        to_sas_internal(sas_ha->core.shost->transportt);
+                struct domain_device *dev = NULL;
+
+                if (asd_phy->port)
+                        dev = asd_phy->port->port_dev;
+
+                /* validate that dev has been probed */
+                if (dev)
+                        dev = sas_find_dev_by_rphy(dev->rphy);
+
+                if (dev && dev_is_sata(dev) && !hard_reset) {
+                        sas_ata_schedule_reset(dev);
+                        sas_ata_wait_eh(dev);
+                        ret = 0;
+                } else
+                        ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
+        } else {
+                struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
+                struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
+                struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number);
+
+                if (ata_dev && !hard_reset) {
+                        sas_ata_schedule_reset(ata_dev);
+                        sas_ata_wait_eh(ata_dev);
+                        ret = 0;
+                } else
+                        ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
+        }
+
+        return ret;
+}
+
 int sas_phy_enable(struct sas_phy *phy, int enable)
 {
         int ret;
@@ -300,7 +354,7 @@ static void phy_reset_work(struct work_struct *work)
 {
         struct sas_phy_data *d = container_of(work, typeof(*d), reset_work);
 
-        d->reset_result = sas_phy_reset(d->phy, d->hard_reset);
+        d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset);
 }
 
 static int sas_phy_setup(struct sas_phy *phy)
diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index 9ba65e0c6f91..ae9698d9d857 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -85,6 +85,7 @@ int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 int sas_smp_get_phy_events(struct sas_phy *phy);
 
 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
+struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id);
 
 void sas_hae_reset(struct work_struct *work);
 
diff --git a/include/linux/libata.h b/include/linux/libata.h
index cafc09a64fe4..aa4270477563 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1147,6 +1147,7 @@ static inline int ata_acpi_cbl_80wire(struct ata_port *ap,
  * EH - drivers/ata/libata-eh.c
  */
 extern void ata_port_schedule_eh(struct ata_port *ap);
+extern void ata_port_wait_eh(struct ata_port *ap);
 extern int ata_link_abort(struct ata_link *link);
 extern int ata_port_abort(struct ata_port *ap);
 extern int ata_port_freeze(struct ata_port *ap);
diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
index c0bcd30eec56..da3f37727387 100644
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -45,6 +45,7 @@ int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
                struct list_head *done_q);
 void sas_probe_sata(struct work_struct *work);
 void sas_ata_schedule_reset(struct domain_device *dev);
+void sas_ata_wait_eh(struct domain_device *dev);
 #else
 
 
@@ -79,6 +80,9 @@ static inline void sas_ata_schedule_reset(struct domain_device *dev)
 {
 }
 
+static inline void sas_ata_wait_eh(struct domain_device *dev)
+{
+}
 #endif
 
 #endif /* _SAS_ATA_H_ */