isci: additional state machine cleanup

Additional state machine cleanups:

 o Remove static functions sci_state_machine_exit_state() and
   sci_state_machine_enter_state()
 o Combines sci_base_state_machine_construct() and
   sci_base_state_machine_start() into a single function,
   sci_init_sm()
 o Remove sci_base_state_machine_stop() which is unused.
 o Kill state_machine.[ch]

Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
[fixed too large to inline functions]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/Makefile

@@ -2,7 +2,6 @@ obj-$(CONFIG_SCSI_ISCI) += isci.o
 isci-objs := init.o phy.o request.o sata.o \
 	     remote_device.o port.o \
 	     host.o task.o probe_roms.o \
-	     state_machine.o \
 	     remote_node_context.o \
 	     remote_node_table.o \
 	     unsolicited_frame_control.o \

drivers/scsi/isci/host.c

@@ -197,6 +197,39 @@
  */
 #define COMPLETION_QUEUE_CYCLE_BIT(x) ((x) & 0x80000000)
 
+/* Init the state machine and call the state entry function (if any) */
+void sci_init_sm(struct sci_base_state_machine *sm,
+		 const struct sci_base_state *state_table, u32 initial_state)
+{
+	sci_state_transition_t handler;
+
+	sm->initial_state_id    = initial_state;
+	sm->previous_state_id   = initial_state;
+	sm->current_state_id    = initial_state;
+	sm->state_table         = state_table;
+
+	handler = sm->state_table[initial_state].enter_state;
+	if (handler)
+		handler(sm);
+}
+
+/* Call the state exit fn, update the current state, call the state entry fn */
+void sci_change_state(struct sci_base_state_machine *sm, u32 next_state)
+{
+	sci_state_transition_t handler;
+
+	handler = sm->state_table[sm->current_state_id].exit_state;
+	if (handler)
+		handler(sm);
+
+	sm->previous_state_id = sm->current_state_id;
+	sm->current_state_id = next_state;
+
+	handler = sm->state_table[sm->current_state_id].enter_state;
+	if (handler)
+		handler(sm);
+}
+
 static bool scic_sds_controller_completion_queue_has_entries(
 	struct scic_sds_controller *scic)
 {
@@ -1807,11 +1840,7 @@ static enum sci_status scic_controller_construct(struct scic_sds_controller *sci
 	struct isci_host *ihost = scic_to_ihost(scic);
 	u8 i;
 
-	sci_base_state_machine_construct(&scic->sm,
-					 scic_sds_controller_state_table,
-					 SCIC_INITIAL);
-
-	sci_base_state_machine_start(&scic->sm);
+	sci_init_sm(&scic->sm, scic_sds_controller_state_table, SCIC_INITIAL);
 
 	scic->scu_registers = scu_base;
 	scic->smu_registers = smu_base;

drivers/scsi/isci/host.h

@@ -58,7 +58,7 @@
 #include "remote_device.h"
 #include "phy.h"
 #include "pool.h"
-#include "state_machine.h"
+#include "isci.h"
 #include "remote_node_table.h"
 #include "registers.h"
 #include "scu_unsolicited_frame.h"

drivers/scsi/isci/isci.h

@@ -57,6 +57,7 @@
 #define __ISCI_H__
 
 #include <linux/interrupt.h>
+#include <linux/types.h>
 
 #define DRV_NAME "isci"
 #define SCI_PCI_BAR_COUNT 2
@@ -584,4 +585,22 @@ static inline void sci_del_timer(struct sci_timer *tmr)
 	del_timer(&tmr->timer);
 }
 
+struct sci_base_state_machine {
+	const struct sci_base_state *state_table;
+	u32 initial_state_id;
+	u32 current_state_id;
+	u32 previous_state_id;
+};
+
+typedef void (*sci_state_transition_t)(struct sci_base_state_machine *sm);
+
+struct sci_base_state {
+	sci_state_transition_t enter_state;	/* Called on state entry */
+	sci_state_transition_t exit_state;	/* Called on state exit */
+};
+
+extern void sci_init_sm(struct sci_base_state_machine *sm,
+			const struct sci_base_state *state_table,
+			u32 initial_state);
+extern void sci_change_state(struct sci_base_state_machine *sm, u32 next_state);
 #endif  /* __ISCI_H__ */

drivers/scsi/isci/phy.c

@@ -1294,11 +1294,7 @@ static const struct sci_base_state scic_sds_phy_state_table[] = {
 void scic_sds_phy_construct(struct scic_sds_phy *sci_phy,
 			    struct scic_sds_port *owning_port, u8 phy_index)
 {
-	sci_base_state_machine_construct(&sci_phy->sm,
-					 scic_sds_phy_state_table,
-					 SCI_PHY_INITIAL);
-
-	sci_base_state_machine_start(&sci_phy->sm);
+	sci_init_sm(&sci_phy->sm, scic_sds_phy_state_table, SCI_PHY_INITIAL);
 
 	/* Copy the rest of the input data to our locals */
 	sci_phy->owning_port = owning_port;

drivers/scsi/isci/phy.h

@@ -57,7 +57,7 @@
 
 #include <scsi/sas.h>
 #include <scsi/libsas.h>
-#include "state_machine.h"
+#include "isci.h"
 #include "sas.h"
 
 /* This is the timeout value for the SATA phy to wait for a SIGNATURE FIS

drivers/scsi/isci/port.c

@@ -1807,11 +1807,7 @@ static const struct sci_base_state scic_sds_port_state_table[] = {
 void scic_sds_port_construct(struct scic_sds_port *sci_port, u8 index,
 			     struct scic_sds_controller *scic)
 {
-	sci_base_state_machine_construct(&sci_port->sm,
-					 scic_sds_port_state_table,
-					 SCI_PORT_STOPPED);
-
-	sci_base_state_machine_start(&sci_port->sm);
+	sci_init_sm(&sci_port->sm, scic_sds_port_state_table, SCI_PORT_STOPPED);
 
 	sci_port->logical_port_index  = SCIC_SDS_DUMMY_PORT;
 	sci_port->physical_port_index = index;

drivers/scsi/isci/remote_device.c

@@ -1095,11 +1095,7 @@ static void scic_remote_device_construct(struct scic_sds_port *sci_port,
 	sci_dev->owning_port = sci_port;
 	sci_dev->started_request_count = 0;
 
-	sci_base_state_machine_construct(&sci_dev->sm,
-					 scic_sds_remote_device_state_table,
-					 SCI_DEV_INITIAL);
-
-	sci_base_state_machine_start(&sci_dev->sm);
+	sci_init_sm(&sci_dev->sm, scic_sds_remote_device_state_table, SCI_DEV_INITIAL);
 
 	scic_sds_remote_node_context_construct(&sci_dev->rnc,
 					       SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX);

drivers/scsi/isci/remote_node_context.c

@@ -54,7 +54,7 @@
  */
 
 #include "host.h"
-#include "state_machine.h"
+#include "isci.h"
 #include "remote_device.h"
 #include "remote_node_context.h"
 #include "scu_event_codes.h"
@@ -373,11 +373,7 @@ void scic_sds_remote_node_context_construct(struct scic_sds_remote_node_context
 	rnc->remote_node_index = remote_node_index;
 	rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;
 
-	sci_base_state_machine_construct(&rnc->sm,
-					 scic_sds_remote_node_context_state_table,
-					 SCI_RNC_INITIAL);
-
-	sci_base_state_machine_start(&rnc->sm);
+	sci_init_sm(&rnc->sm, scic_sds_remote_node_context_state_table, SCI_RNC_INITIAL);
 }
 
 enum sci_status scic_sds_remote_node_context_event_handler(struct scic_sds_remote_node_context *sci_rnc,

drivers/scsi/isci/remote_node_context.h

@@ -64,7 +64,7 @@
  *
  */
 
-#include "state_machine.h"
+#include "isci.h"
 
 /**
  *

drivers/scsi/isci/request.c

@@ -3077,10 +3077,7 @@ scic_sds_general_request_construct(struct scic_sds_controller *scic,
 				   u16 io_tag,
 				   struct scic_sds_request *sci_req)
 {
-	sci_base_state_machine_construct(&sci_req->sm,
-					 scic_sds_request_state_table,
-					 SCI_REQ_INIT);
-	sci_base_state_machine_start(&sci_req->sm);
+	sci_init_sm(&sci_req->sm, scic_sds_request_state_table, SCI_REQ_INIT);
 
 	sci_req->io_tag = io_tag;
 	sci_req->owning_controller = scic;