Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 139 insertions, 124 deletions

diff --git a/drivers/scsi/isci/port.c b/drivers/scsi/isci/port.c
index 7c6ac58a5c4c..5fada73b71ff 100644
--- a/drivers/scsi/isci/port.c
+++ b/drivers/scsi/isci/port.c
@@ -60,18 +60,29 @@
 #define SCIC_SDS_PORT_HARD_RESET_TIMEOUT  (1000)
 #define SCU_DUMMY_INDEX    (0xFFFF)
 
-static void isci_port_change_state(struct isci_port *iport, enum isci_status status)
+#undef C
+#define C(a) (#a)
+const char *port_state_name(enum sci_port_states state)
 {
-	unsigned long flags;
+	static const char * const strings[] = PORT_STATES;
+
+	return strings[state];
+}
+#undef C
+
+static struct device *sciport_to_dev(struct isci_port *iport)
+{
+	int i = iport->physical_port_index;
+	struct isci_port *table;
+	struct isci_host *ihost;
+
+	if (i == SCIC_SDS_DUMMY_PORT)
+		i = SCI_MAX_PORTS+1;
 
-	dev_dbg(&iport->isci_host->pdev->dev,
-		"%s: iport = %p, state = 0x%x\n",
-		__func__, iport, status);
+	table = iport - i;
+	ihost = container_of(table, typeof(*ihost), ports[0]);
 
-	/* XXX pointless lock */
-	spin_lock_irqsave(&iport->state_lock, flags);
-	iport->status = status;
-	spin_unlock_irqrestore(&iport->state_lock, flags);
+	return &ihost->pdev->dev;
 }
 
 static void sci_port_get_protocols(struct isci_port *iport, struct sci_phy_proto *proto)
@@ -165,18 +176,12 @@ static void isci_port_link_up(struct isci_host *isci_host,
 	struct sci_port_properties properties;
 	unsigned long success = true;
 
-	BUG_ON(iphy->isci_port != NULL);
-
-	iphy->isci_port = iport;
-
 	dev_dbg(&isci_host->pdev->dev,
 		"%s: isci_port = %p\n",
 		__func__, iport);
 
 	spin_lock_irqsave(&iphy->sas_phy.frame_rcvd_lock, flags);
 
-	isci_port_change_state(iphy->isci_port, isci_starting);
-
 	sci_port_get_properties(iport, &properties);
 
 	if (iphy->protocol == SCIC_SDS_PHY_PROTOCOL_SATA) {
@@ -258,7 +263,6 @@ static void isci_port_link_down(struct isci_host *isci_host,
 					__func__, isci_device);
 				set_bit(IDEV_GONE, &isci_device->flags);
 			}
-			isci_port_change_state(isci_port, isci_stopping);
 		}
 	}
 
@@ -269,52 +273,10 @@ static void isci_port_link_down(struct isci_host *isci_host,
 	isci_host->sas_ha.notify_phy_event(&isci_phy->sas_phy,
 					   PHYE_LOSS_OF_SIGNAL);
 
-	isci_phy->isci_port = NULL;
-
 	dev_dbg(&isci_host->pdev->dev,
 		"%s: isci_port = %p - Done\n", __func__, isci_port);
 }
 
-
-/**
- * isci_port_ready() - This function is called by the sci core when a link
- *    becomes ready.
- * @isci_host: This parameter specifies the isci host object.
- * @port: This parameter specifies the sci port with the active link.
- *
- */
-static void isci_port_ready(struct isci_host *isci_host, struct isci_port *isci_port)
-{
-	dev_dbg(&isci_host->pdev->dev,
-		"%s: isci_port = %p\n", __func__, isci_port);
-
-	complete_all(&isci_port->start_complete);
-	isci_port_change_state(isci_port, isci_ready);
-	return;
-}
-
-/**
- * isci_port_not_ready() - This function is called by the sci core when a link
- *    is not ready. All remote devices on this link will be removed if they are
- *    in the stopping state.
- * @isci_host: This parameter specifies the isci host object.
- * @port: This parameter specifies the sci port with the active link.
- *
- */
-static void isci_port_not_ready(struct isci_host *isci_host, struct isci_port *isci_port)
-{
-	dev_dbg(&isci_host->pdev->dev,
-		"%s: isci_port = %p\n", __func__, isci_port);
-}
-
-static void isci_port_stop_complete(struct isci_host *ihost,
-				    struct isci_port *iport,
-				    enum sci_status completion_status)
-{
-	dev_dbg(&ihost->pdev->dev, "Port stop complete\n");
-}
-
-
 static bool is_port_ready_state(enum sci_port_states state)
 {
 	switch (state) {
@@ -353,7 +315,9 @@ static void port_state_machine_change(struct isci_port *iport,
 static void isci_port_hard_reset_complete(struct isci_port *isci_port,
 					  enum sci_status completion_status)
 {
-	dev_dbg(&isci_port->isci_host->pdev->dev,
+	struct isci_host *ihost = isci_port->owning_controller;
+
+	dev_dbg(&ihost->pdev->dev,
 		"%s: isci_port = %p, completion_status=%x\n",
 		     __func__, isci_port, completion_status);
 
@@ -364,23 +328,24 @@ static void isci_port_hard_reset_complete(struct isci_port *isci_port,
 
 		/* The reset failed.  The port state is now SCI_PORT_FAILED. */
 		if (isci_port->active_phy_mask == 0) {
+			int phy_idx = isci_port->last_active_phy;
+			struct isci_phy *iphy = &ihost->phys[phy_idx];
 
 			/* Generate the link down now to the host, since it
 			 * was intercepted by the hard reset state machine when
 			 * it really happened.
 			 */
-			isci_port_link_down(isci_port->isci_host,
-					    &isci_port->isci_host->phys[
-						   isci_port->last_active_phy],
-					    isci_port);
+			isci_port_link_down(ihost, iphy, isci_port);
 		}
 		/* Advance the port state so that link state changes will be
-		* noticed.
-		*/
+		 * noticed.
+		 */
 		port_state_machine_change(isci_port, SCI_PORT_SUB_WAITING);
 
 	}
-	complete_all(&isci_port->hard_reset_complete);
+	clear_bit(IPORT_RESET_PENDING, &isci_port->state);
+	wake_up(&ihost->eventq);
+
 }
 
 /* This method will return a true value if the specified phy can be assigned to
@@ -835,10 +800,9 @@ static void port_timeout(unsigned long data)
 			__func__,
 			iport);
 	} else if (current_state == SCI_PORT_STOPPING) {
-		/* if the port is still stopping then the stop has not completed */
-		isci_port_stop_complete(iport->owning_controller,
-					iport,
-					SCI_FAILURE_TIMEOUT);
+		dev_dbg(sciport_to_dev(iport),
+			"%s: port%d: stop complete timeout\n",
+			__func__, iport->physical_port_index);
 	} else {
 		/* The port is in the ready state and we have a timer
 		 * reporting a timeout this should not happen.
@@ -1003,7 +967,8 @@ static void sci_port_ready_substate_operational_enter(struct sci_base_state_mach
 	struct isci_port *iport = container_of(sm, typeof(*iport), sm);
 	struct isci_host *ihost = iport->owning_controller;
 
-	isci_port_ready(ihost, iport);
+	dev_dbg(&ihost->pdev->dev, "%s: port%d ready\n",
+		__func__, iport->physical_port_index);
 
 	for (index = 0; index < SCI_MAX_PHYS; index++) {
 		if (iport->phy_table[index]) {
@@ -1069,7 +1034,8 @@ static void sci_port_ready_substate_operational_exit(struct sci_base_state_machi
 	 */
 	sci_port_abort_dummy_request(iport);
 
-	isci_port_not_ready(ihost, iport);
+	dev_dbg(&ihost->pdev->dev, "%s: port%d !ready\n",
+		__func__, iport->physical_port_index);
 
 	if (iport->ready_exit)
 		sci_port_invalidate_dummy_remote_node(iport);
@@ -1081,7 +1047,8 @@ static void sci_port_ready_substate_configuring_enter(struct sci_base_state_mach
 	struct isci_host *ihost = iport->owning_controller;
 
 	if (iport->active_phy_mask == 0) {
-		isci_port_not_ready(ihost, iport);
+		dev_dbg(&ihost->pdev->dev, "%s: port%d !ready\n",
+			__func__, iport->physical_port_index);
 
 		port_state_machine_change(iport, SCI_PORT_SUB_WAITING);
 	} else
@@ -1097,8 +1064,8 @@ enum sci_status sci_port_start(struct isci_port *iport)
 
 	state = iport->sm.current_state_id;
 	if (state != SCI_PORT_STOPPED) {
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 
@@ -1172,8 +1139,8 @@ enum sci_status sci_port_stop(struct isci_port *iport)
 					  SCI_PORT_STOPPING);
 		return SCI_SUCCESS;
 	default:
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 }
@@ -1187,8 +1154,8 @@ static enum sci_status sci_port_hard_reset(struct isci_port *iport, u32 timeout)
 
 	state = iport->sm.current_state_id;
 	if (state != SCI_PORT_SUB_OPERATIONAL) {
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 
@@ -1282,8 +1249,8 @@ enum sci_status sci_port_add_phy(struct isci_port *iport,
 					  SCI_PORT_SUB_CONFIGURING);
 		return SCI_SUCCESS;
 	default:
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 }
@@ -1332,8 +1299,8 @@ enum sci_status sci_port_remove_phy(struct isci_port *iport,
 					  SCI_PORT_SUB_CONFIGURING);
 		return SCI_SUCCESS;
 	default:
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 }
@@ -1375,8 +1342,8 @@ enum sci_status sci_port_link_up(struct isci_port *iport,
 		sci_port_general_link_up_handler(iport, iphy, PF_RESUME);
 		return SCI_SUCCESS;
 	default:
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 }
@@ -1405,8 +1372,8 @@ enum sci_status sci_port_link_down(struct isci_port *iport,
 		sci_port_deactivate_phy(iport, iphy, false);
 		return SCI_SUCCESS;
 	default:
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 }
@@ -1425,8 +1392,8 @@ enum sci_status sci_port_start_io(struct isci_port *iport,
 		iport->started_request_count++;
 		return SCI_SUCCESS;
 	default:
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	}
 }
@@ -1440,8 +1407,8 @@ enum sci_status sci_port_complete_io(struct isci_port *iport,
 	state = iport->sm.current_state_id;
 	switch (state) {
 	case SCI_PORT_STOPPED:
-		dev_warn(sciport_to_dev(iport),
-			 "%s: in wrong state: %d\n", __func__, state);
+		dev_warn(sciport_to_dev(iport), "%s: in wrong state: %s\n",
+			 __func__, port_state_name(state));
 		return SCI_FAILURE_INVALID_STATE;
 	case SCI_PORT_STOPPING:
 		sci_port_decrement_request_count(iport);
@@ -1547,7 +1514,8 @@ static void sci_port_ready_state_enter(struct sci_base_state_machine *sm)
 	if (prev_state  == SCI_PORT_RESETTING)
 		isci_port_hard_reset_complete(iport, SCI_SUCCESS);
 	else
-		isci_port_not_ready(ihost, iport);
+		dev_dbg(&ihost->pdev->dev, "%s: port%d !ready\n",
+			__func__, iport->physical_port_index);
 
 	/* Post and suspend the dummy remote node context for this port. */
 	sci_port_post_dummy_remote_node(iport);
@@ -1644,22 +1612,7 @@ void isci_port_init(struct isci_port *iport, struct isci_host *ihost, int index)
 {
 	INIT_LIST_HEAD(&iport->remote_dev_list);
 	INIT_LIST_HEAD(&iport->domain_dev_list);
-	spin_lock_init(&iport->state_lock);
-	init_completion(&iport->start_complete);
 	iport->isci_host = ihost;
-	isci_port_change_state(iport, isci_freed);
-}
-
-/**
- * isci_port_get_state() - This function gets the status of the port object.
- * @isci_port: This parameter points to the isci_port object
- *
- * status of the object as a isci_status enum.
- */
-enum isci_status isci_port_get_state(
-	struct isci_port *isci_port)
-{
-	return isci_port->status;
 }
 
 void sci_port_broadcast_change_received(struct isci_port *iport, struct isci_phy *iphy)
@@ -1670,6 +1623,11 @@ void sci_port_broadcast_change_received(struct isci_port *iport, struct isci_phy
 	isci_port_bc_change_received(ihost, iport, iphy);
 }
 
+static void wait_port_reset(struct isci_host *ihost, struct isci_port *iport)
+{
+	wait_event(ihost->eventq, !test_bit(IPORT_RESET_PENDING, &iport->state));
+}
+
 int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
 				 struct isci_phy *iphy)
 {
@@ -1680,9 +1638,8 @@ int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *ipor
 	dev_dbg(&ihost->pdev->dev, "%s: iport = %p\n",
 		__func__, iport);
 
-	init_completion(&iport->hard_reset_complete);
-
 	spin_lock_irqsave(&ihost->scic_lock, flags);
+	set_bit(IPORT_RESET_PENDING, &iport->state);
 
 	#define ISCI_PORT_RESET_TIMEOUT SCIC_SDS_SIGNATURE_FIS_TIMEOUT
 	status = sci_port_hard_reset(iport, ISCI_PORT_RESET_TIMEOUT);
@@ -1690,7 +1647,7 @@ int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *ipor
 	spin_unlock_irqrestore(&ihost->scic_lock, flags);
 
 	if (status == SCI_SUCCESS) {
-		wait_for_completion(&iport->hard_reset_complete);
+		wait_port_reset(ihost, iport);
 
 		dev_dbg(&ihost->pdev->dev,
 			"%s: iport = %p; hard reset completion\n",
@@ -1704,6 +1661,8 @@ int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *ipor
 				__func__, iport, iport->hard_reset_status);
 		}
 	} else {
+		clear_bit(IPORT_RESET_PENDING, &iport->state);
+		wake_up(&ihost->eventq);
 		ret = TMF_RESP_FUNC_FAILED;
 
 		dev_err(&ihost->pdev->dev,
@@ -1726,24 +1685,80 @@ int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *ipor
 	return ret;
 }
 
-/**
- * isci_port_deformed() - This function is called by libsas when a port becomes
- *    inactive.
- * @phy: This parameter specifies the libsas phy with the inactive port.
- *
- */
+int isci_ata_check_ready(struct domain_device *dev)
+{
+	struct isci_port *iport = dev->port->lldd_port;
+	struct isci_host *ihost = dev_to_ihost(dev);
+	struct isci_remote_device *idev;
+	unsigned long flags;
+	int rc = 0;
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	idev = isci_lookup_device(dev);
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	if (!idev)
+		goto out;
+
+	if (test_bit(IPORT_RESET_PENDING, &iport->state))
+		goto out;
+
+	rc = !!iport->active_phy_mask;
+ out:
+	isci_put_device(idev);
+
+	return rc;
+}
+
 void isci_port_deformed(struct asd_sas_phy *phy)
 {
-	pr_debug("%s: sas_phy = %p\n", __func__, phy);
+	struct isci_host *ihost = phy->ha->lldd_ha;
+	struct isci_port *iport = phy->port->lldd_port;
+	unsigned long flags;
+	int i;
+
+	/* we got a port notification on a port that was subsequently
+	 * torn down and libsas is just now catching up
+	 */
+	if (!iport)
+		return;
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	for (i = 0; i < SCI_MAX_PHYS; i++) {
+		if (iport->active_phy_mask & 1 << i)
+			break;
+	}
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	if (i >= SCI_MAX_PHYS)
+		dev_dbg(&ihost->pdev->dev, "%s: port: %ld\n",
+			__func__, (long) (iport - &ihost->ports[0]));
 }
 
-/**
- * isci_port_formed() - This function is called by libsas when a port becomes
- *    active.
- * @phy: This parameter specifies the libsas phy with the active port.
- *
- */
 void isci_port_formed(struct asd_sas_phy *phy)
 {
-	pr_debug("%s: sas_phy = %p, sas_port = %p\n", __func__, phy, phy->port);
+	struct isci_host *ihost = phy->ha->lldd_ha;
+	struct isci_phy *iphy = to_iphy(phy);
+	struct asd_sas_port *port = phy->port;
+	struct isci_port *iport;
+	unsigned long flags;
+	int i;
+
+	/* initial ports are formed as the driver is still initializing,
+	 * wait for that process to complete
+	 */
+	wait_for_start(ihost);
+
+	spin_lock_irqsave(&ihost->scic_lock, flags);
+	for (i = 0; i < SCI_MAX_PORTS; i++) {
+		iport = &ihost->ports[i];
+		if (iport->active_phy_mask & 1 << iphy->phy_index)
+			break;
+	}
+	spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+	if (i >= SCI_MAX_PORTS)
+		iport = NULL;
+
+	port->lldd_port = iport;
 }