isci: unify rnc start{io|task} handlers

Unify rnc start{io|task} handlers and delete the state handler
infrastructure.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

3 files changed, 47 insertions, 307 deletions

diff --git a/drivers/scsi/isci/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
index 095d61288c3..82507bd228d 100644
--- a/drivers/scsi/isci/remote_node_context.c
+++ b/drivers/scsi/isci/remote_node_context.c
@@ -176,15 +176,6 @@ static void scic_sds_remote_node_context_setup_to_resume(
 	}
 }
 
-/**
- *
- * @sci_rnc:
- * @callback:
- * @callback_parameter:
- *
- * This method will setup the remote node context object so it will transistion
- * to its final state. none
- */
 static void scic_sds_remote_node_context_setup_to_destory(
 	struct scic_sds_remote_node_context *sci_rnc,
 	scics_sds_remote_node_context_callback callback,
@@ -195,146 +186,6 @@ static void scic_sds_remote_node_context_setup_to_destory(
 	sci_rnc->user_cookie       = callback_parameter;
 }
 
-static enum sci_status scic_sds_remote_node_context_default_start_io_handler(
-	struct scic_sds_remote_node_context *sci_rnc,
-	struct scic_sds_request *sci_req)
-{
-	dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
-		 "%s: SCIC Remote Node Context 0x%p requested to start io "
-		 "0x%p while in wrong state %d\n",
-		 __func__,
-		 sci_rnc,
-		 sci_req,
-		 sci_base_state_machine_get_state(&sci_rnc->state_machine));
-
-	return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
-}
-
-static enum sci_status scic_sds_remote_node_context_default_start_task_handler(
-	struct scic_sds_remote_node_context *sci_rnc,
-	struct scic_sds_request *sci_req)
-{
-	dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
-		 "%s: SCIC Remote Node Context 0x%p requested to start "
-		 "task 0x%p while in wrong state %d\n",
-		 __func__,
-		 sci_rnc,
-		 sci_req,
-		 sci_base_state_machine_get_state(&sci_rnc->state_machine));
-
-	return SCI_FAILURE;
-}
-
-/**
- *
- * @sci_rnc: The rnc for which the task request is targeted.
- * @sci_req: The request which is going to be started.
- *
- * This method determines if the task request can be started by the SCU
- * hardware. When the RNC is in the ready state any task can be started.
- * enum sci_status SCI_SUCCESS
- */
-static enum sci_status scic_sds_remote_node_context_success_start_task_handler(
-	struct scic_sds_remote_node_context *sci_rnc,
-	struct scic_sds_request *sci_req)
-{
-	return SCI_SUCCESS;
-}
-
-/**
- *
- * @sci_rnc: The rnc for which the io request is targeted.
- * @sci_req: The request which is going to be started.
- *
- * This method determines if the io request can be started by the SCU hardware.
- * When the RNC is in the ready state any io request can be started. enum sci_status
- * SCI_SUCCESS
- */
-static enum sci_status scic_sds_remote_node_context_ready_state_start_io_handler(
-	struct scic_sds_remote_node_context *sci_rnc,
-	struct scic_sds_request *sci_req)
-{
-	return SCI_SUCCESS;
-}
-
-/**
- *
- * @sci_rnc: The remote node context which is to receive the task request.
- * @sci_req: The task request to be transmitted to to the remote target
- *    device.
- *
- * This method will report a success or failure attempt to start a new task
- * request to the hardware.  Since all task requests are sent on the high
- * priority queue they can be sent when the RCN is in a TX suspend state.
- * enum sci_status SCI_SUCCESS
- */
-static enum sci_status scic_sds_remote_node_context_suspended_start_task_handler(
-	struct scic_sds_remote_node_context *sci_rnc,
-	struct scic_sds_request *sci_req)
-{
-	scic_sds_remote_node_context_resume(sci_rnc, NULL, NULL);
-
-	return SCI_SUCCESS;
-}
-
-/**
- *
- * @sci_rnc: The remote node context which is to receive the task request.
- * @sci_req: The task request to be transmitted to to the remote target
- *    device.
- *
- * This method will report a success or failure attempt to start a new task
- * request to the hardware.  Since all task requests are sent on the high
- * priority queue they can be sent when the RCN is in a TX suspend state.
- * enum sci_status SCI_SUCCESS
- */
-static enum sci_status scic_sds_remote_node_context_await_suspension_state_start_task_handler(
-	struct scic_sds_remote_node_context *sci_rnc,
-	struct scic_sds_request *sci_req)
-{
-	return SCI_SUCCESS;
-}
-
-static struct scic_sds_remote_node_context_handlers scic_sds_remote_node_context_state_handler_table[] = {
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_default_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_default_start_task_handler,
-	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_POSTING_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_default_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_default_start_task_handler,
-	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_default_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_default_start_task_handler,
-	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_default_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_success_start_task_handler,
-	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_ready_state_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_success_start_task_handler,
-	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_default_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_suspended_start_task_handler,
-	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_default_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_suspended_start_task_handler,
-	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE] = {
-		.start_io_handler	= scic_sds_remote_node_context_default_start_io_handler,
-		.start_task_handler	= scic_sds_remote_node_context_await_suspension_state_start_task_handler,
-	}
-};
-
-/*
- * *****************************************************************************
- * * REMOTE NODE CONTEXT PRIVATE METHODS
- * ***************************************************************************** */
-
 /**
  *
  *
@@ -415,80 +266,34 @@ static void scic_sds_remote_node_context_invalidate_context_buffer(
 					    SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE);
 }
 
-/*
- * *****************************************************************************
- * * REMOTE NODE CONTEXT STATE ENTER AND EXIT METHODS
- * ***************************************************************************** */
-
-/**
- *
- *
- *
- */
 static void scic_sds_remote_node_context_initial_state_enter(void *object)
 {
 	struct scic_sds_remote_node_context *rnc = object;
+	struct sci_base_state_machine *sm = &rnc->state_machine;
 
-	SET_STATE_HANDLER(
-		rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE
-		);
-
-	/*
-	 * Check to see if we have gotten back to the initial state because someone
-	 * requested to destroy the remote node context object. */
-	if (
-		rnc->state_machine.previous_state_id
-		== SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE
-		) {
+	/* Check to see if we have gotten back to the initial state because
+	 * someone requested to destroy the remote node context object.
+	 */
+	if (sm->previous_state_id == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE) {
 		rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
-
 		scic_sds_remote_node_context_notify_user(rnc);
 	}
 }
 
-/**
- *
- *
- *
- */
 static void scic_sds_remote_node_context_posting_state_enter(void *object)
 {
 	struct scic_sds_remote_node_context *sci_rnc = object;
 
-	SET_STATE_HANDLER(
-		sci_rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_POSTING_STATE
-		);
-
 	scic_sds_remote_node_context_validate_context_buffer(sci_rnc);
 }
 
-/**
- *
- *
- *
- */
 static void scic_sds_remote_node_context_invalidating_state_enter(void *object)
 {
 	struct scic_sds_remote_node_context *rnc = object;
 
-	SET_STATE_HANDLER(
-		rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE
-		);
-
 	scic_sds_remote_node_context_invalidate_context_buffer(rnc);
 }
 
-/**
- *
- *
- *
- */
 static void scic_sds_remote_node_context_resuming_state_enter(void *object)
 {
 	struct scic_sds_remote_node_context *rnc = object;
@@ -498,12 +303,6 @@ static void scic_sds_remote_node_context_resuming_state_enter(void *object)
 	sci_dev = rnc_to_dev(rnc);
 	dev = sci_dev_to_domain(sci_dev);
 
-	SET_STATE_HANDLER(
-		rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE
-		);
-
 	/*
 	 * For direct attached SATA devices we need to clear the TLCR
 	 * NCQ to TCi tag mapping on the phy and in cases where we
@@ -518,84 +317,31 @@ static void scic_sds_remote_node_context_resuming_state_enter(void *object)
 	scic_sds_remote_device_post_request(sci_dev, SCU_CONTEXT_COMMAND_POST_RNC_RESUME);
 }
 
-/**
- *
- *
- *
- */
 static void scic_sds_remote_node_context_ready_state_enter(void *object)
 {
 	struct scic_sds_remote_node_context *rnc = object;
 
-	SET_STATE_HANDLER(
-		rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE
-		);
-
 	rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
 
-	if (rnc->user_callback != NULL) {
+	if (rnc->user_callback)
 		scic_sds_remote_node_context_notify_user(rnc);
-	}
 }
 
-/**
- *
- *
- *
- */
 static void scic_sds_remote_node_context_tx_suspended_state_enter(void *object)
 {
 	struct scic_sds_remote_node_context *rnc = object;
 
-	SET_STATE_HANDLER(
-		rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE
-		);
-
 	scic_sds_remote_node_context_continue_state_transitions(rnc);
 }
 
-/**
- *
- *
- *
- */
 static void scic_sds_remote_node_context_tx_rx_suspended_state_enter(
 		void *object)
 {
 	struct scic_sds_remote_node_context *rnc = object;
 
-	SET_STATE_HANDLER(
-		rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE
-		);
-
 	scic_sds_remote_node_context_continue_state_transitions(rnc);
 }
 
-/**
- *
- *
- *
- */
-static void scic_sds_remote_node_context_await_suspension_state_enter(
-	void *object)
-{
-	struct scic_sds_remote_node_context *rnc = object;
-
-	SET_STATE_HANDLER(
-		rnc,
-		scic_sds_remote_node_context_state_handler_table,
-		SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE
-		);
-}
-
-/* --------------------------------------------------------------------------- */
-
 static const struct sci_base_state scic_sds_remote_node_context_state_table[] = {
 	[SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE] = {
 		.enter_state = scic_sds_remote_node_context_initial_state_enter,
@@ -618,9 +364,7 @@ static const struct sci_base_state scic_sds_remote_node_context_state_table[] =
 	[SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE] = {
 		.enter_state = scic_sds_remote_node_context_tx_rx_suspended_state_enter,
 	},
-	[SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE] = {
-		.enter_state = scic_sds_remote_node_context_await_suspension_state_enter,
-	},
+	[SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE] = { },
 };
 
 void scic_sds_remote_node_context_construct(struct scic_sds_remote_node_context *rnc,
@@ -875,3 +619,39 @@ enum sci_status scic_sds_remote_node_context_resume(struct scic_sds_remote_node_
 		return SCI_FAILURE_INVALID_STATE;
 	}
 }
+
+enum sci_status scic_sds_remote_node_context_start_io(struct scic_sds_remote_node_context *sci_rnc,
+							     struct scic_sds_request *sci_req)
+{
+	enum scis_sds_remote_node_context_states state;
+
+	state = sci_rnc->state_machine.current_state_id;
+	if (state != SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE) {
+		dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
+			 "%s: invalid state %d\n", __func__, state);
+		return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
+	}
+	return SCI_SUCCESS;
+}
+
+enum sci_status scic_sds_remote_node_context_start_task(struct scic_sds_remote_node_context *sci_rnc,
+							struct scic_sds_request *sci_req)
+{
+	enum scis_sds_remote_node_context_states state;
+
+	state = sci_rnc->state_machine.current_state_id;
+	switch (state) {
+	case SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE:
+	case SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE:
+	case SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE:
+		return SCI_SUCCESS;
+	case SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE:
+	case SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE:
+		scic_sds_remote_node_context_resume(sci_rnc, NULL, NULL);
+		return SCI_SUCCESS;
+	default:
+		dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
+			 "%s: invalid state %d\n", __func__, state);
+		return SCI_FAILURE_INVALID_STATE;
+	}
+}
diff --git a/drivers/scsi/isci/remote_node_context.h b/drivers/scsi/isci/remote_node_context.h
index 68983748eba..f53329f782c 100644
--- a/drivers/scsi/isci/remote_node_context.h
+++ b/drivers/scsi/isci/remote_node_context.h
@@ -84,31 +84,6 @@ struct scic_sds_remote_node_context;
 
 typedef void (*scics_sds_remote_node_context_callback)(void *);
 
-typedef enum sci_status (*scic_sds_remote_node_context_operation)(
-	struct scic_sds_remote_node_context *sci_rnc,
-	scics_sds_remote_node_context_callback callback,
-	void *callback_parameter
-	);
-
-typedef enum sci_status (*scic_sds_remote_node_context_io_request)(
-	struct scic_sds_remote_node_context *sci_rnc,
-	struct scic_sds_request *sci_req
-	);
-
-struct scic_sds_remote_node_context_handlers {
-	/**
-	 * This handler is invoked when there is a request to start an io request
-	 * operation.
-	 */
-	scic_sds_remote_node_context_io_request start_io_handler;
-
-	/**
-	 * This handler is invoked when there is a request to start a task request
-	 * operation.
-	 */
-	scic_sds_remote_node_context_io_request start_task_handler;
-};
-
 /**
  * This is the enumeration of the remote node context states.
  */
@@ -220,8 +195,6 @@ struct scic_sds_remote_node_context {
 	 * This field contains the data for the object's state machine.
 	 */
 	struct sci_base_state_machine state_machine;
-
-	struct scic_sds_remote_node_context_handlers *state_handlers;
 };
 
 void scic_sds_remote_node_context_construct(struct scic_sds_remote_node_context *rnc,
@@ -236,24 +209,19 @@ bool scic_sds_remote_node_context_is_ready(
 
 enum sci_status scic_sds_remote_node_context_event_handler(struct scic_sds_remote_node_context *sci_rnc,
 							   u32 event_code);
-
 enum sci_status scic_sds_remote_node_context_destruct(struct scic_sds_remote_node_context *sci_rnc,
 						      scics_sds_remote_node_context_callback callback,
 						      void *callback_parameter);
-
 enum sci_status scic_sds_remote_node_context_suspend(struct scic_sds_remote_node_context *sci_rnc,
 						     u32 suspend_type,
 						     scics_sds_remote_node_context_callback cb_fn,
 						     void *cb_p);
-
 enum sci_status scic_sds_remote_node_context_resume(struct scic_sds_remote_node_context *sci_rnc,
 						    scics_sds_remote_node_context_callback cb_fn,
 						    void *cb_p);
-
-#define scic_sds_remote_node_context_start_io(rnc, request) \
-	((rnc)->state_handlers->start_io_handler(rnc, request))
-
-#define scic_sds_remote_node_context_start_task(rnc, task) \
-	((rnc)->state_handlers->start_task_handler(rnc, task))
+enum sci_status scic_sds_remote_node_context_start_task(struct scic_sds_remote_node_context *sci_rnc,
+							struct scic_sds_request *sci_req);
+enum sci_status scic_sds_remote_node_context_start_io(struct scic_sds_remote_node_context *sci_rnc,
+						      struct scic_sds_request *sci_req);
 
 #endif  /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */
diff --git a/drivers/scsi/isci/state_machine.h b/drivers/scsi/isci/state_machine.h
index c29eb4271d0..60ef1cf5abf 100644
--- a/drivers/scsi/isci/state_machine.h
+++ b/drivers/scsi/isci/state_machine.h
@@ -84,14 +84,6 @@ struct sci_base_state {
 };
 
 /**
- * SET_STATE_HANDLER() -
- *
- * This macro simply provides simplified retrieval of an objects state handler.
- */
-#define SET_STATE_HANDLER(object, table, state)	\
-	(object)->state_handlers = &(table)[(state)]
-
-/**
  * struct sci_base_state_machine - This structure defines the fields common to
  *    all state machines.
  *