isci: unify rnc start{io|task} handlers
Dan Williams [Thu, 12 May 2011 16:27:52 +0000 (09:27 -0700)]
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>

drivers/scsi/isci/remote_node_context.c
drivers/scsi/isci/remote_node_context.h
drivers/scsi/isci/state_machine.h

index 095d612..82507bd 100644 (file)
@@ -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;
+       }
+}
index 6898374..f53329f 100644 (file)
@@ -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_ */
index c29eb42..60ef1cf 100644 (file)
@@ -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.
  *