isci: remove SCIC_DEBUG_ENABLED, and fixup an odd macro

This will be replaced by state machine tracepoints and should have been a part
of the logger removal.

Ran across scic_sds_port_decrement_request_count() which is an ugly macro
which silently hides accounting errors.  Turn it into a WARN_ONCE to see if it
ever triggers.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/core/scic_sds_phy.c

@@ -267,101 +267,6 @@ static void scic_sds_phy_sata_timeout(void *phy)
 		);
 }
 
-/*
- * *****************************************************************************
- * * SCIC SDS PHY External Methods
- * ***************************************************************************** */
-
-/**
- * This method returns the object size for a phy object.
- *
- * u32
- */
-
-/**
- * This method returns the minimum number of timers required for a phy object.
- *
- * u32
- */
-
-/**
- * This method returns the maximum number of timers required for a phy object.
- *
- * u32
- */
-
-#ifdef SCIC_DEBUG_ENABLED
-/**
- * scic_sds_phy_observe_state_change() -
- * @our_observer:
- *
- * Debug code to record the state transitions in the phy
- */
-void scic_sds_phy_observe_state_change(
-	struct sci_base_observer *our_observer,
-	struct sci_base_subject *the_subject)
-{
-	struct scic_sds_phy *this_phy;
-	struct sci_base_state_machine *the_state_machine;
-
-	u8 transition_requestor;
-	u32 base_state_id;
-	u32 starting_substate_id;
-
-	the_state_machine = (struct sci_base_state_machine *)the_subject;
-	this_phy = (struct scic_sds_phy *)the_state_machine->state_machine_owner;
-
-	if (the_state_machine == &this_phy->parent.state_machine) {
-		transition_requestor = 0x01;
-	} else if (the_state_machine == &this_phy->starting_substate_machine) {
-		transition_requestor = 0x02;
-	} else {
-		transition_requestor = 0xFF;
-	}
-
-	base_state_id =
-		sci_base_state_machine_get_state(&this_phy->parent.state_machine);
-	starting_substate_id =
-		sci_base_state_machine_get_state(&this_phy->starting_substate_machine);
-
-	this_phy->state_record.state_transition_table[
-		this_phy->state_record.index++] = ((transition_requestor << 24)
-						   | ((u8)base_state_id << 8)
-						   | ((u8)starting_substate_id));
-
-	this_phy->state_record.index =
-		this_phy->state_record.index & (MAX_STATE_TRANSITION_RECORD - 1);
-
-}
-#endif /* SCIC_DEBUG_ENABLED */
-
-#ifdef SCIC_DEBUG_ENABLED
-/**
- * scic_sds_phy_initialize_state_recording() -
- *
- * This method initializes the state record debug information for the phy
- * object. The state machines for the phy object must be constructed before
- * this function is called.
- */
-void scic_sds_phy_initialize_state_recording(
-	struct scic_sds_phy *this_phy)
-{
-	this_phy->state_record.index = 0;
-
-	sci_base_observer_initialize(
-		&this_phy->state_record.base_state_observer,
-		scic_sds_phy_observe_state_change,
-		&this_phy->parent.state_machine.parent
-		);
-
-	sci_base_observer_initialize(
-		&this_phy->state_record.starting_state_observer,
-		scic_sds_phy_observe_state_change,
-		&this_phy->starting_substate_machine.parent
-		);
-}
-#endif /* SCIC_DEBUG_ENABLED */
-
 /**
  * This method will construct the struct scic_sds_phy object
  * @this_phy:
@@ -400,10 +305,6 @@ void scic_sds_phy_construct(
 		scic_sds_phy_starting_substates,
 		SCIC_SDS_PHY_STARTING_SUBSTATE_INITIAL
 		);
-
-   #ifdef SCIC_DEBUG_ENABLED
-	scic_sds_phy_initialize_state_recording(this_phy);
-   #endif /* SCIC_DEBUG_ENABLED */
 }
 
 /**

drivers/scsi/isci/core/scic_sds_phy.h

@@ -156,25 +156,6 @@ enum SCIC_SDS_PHY_STARTING_SUBSTATES {
 struct scic_sds_port;
 struct scic_sds_controller;
 
-#ifdef SCIC_DEBUG_ENABLED
-#define MAX_STATE_TRANSITION_RECORD    (256)
-
-/**
- *
- *
- * Debug code to record the state transitions for the phy object
- */
-struct scic_sds_phy_state_record {
-	struct sci_base_observer base_state_observer;
-	struct sci_base_observer starting_state_observer;
-
-	u16 index;
-
-	u32 state_transition_table[MAX_STATE_TRANSITION_RECORD];
-
-};
-#endif /* SCIC_DEBUG_ENABLED */
-
 /**
  * This enumeration provides a named phy type for the state machine
  *
@@ -271,10 +252,6 @@ struct scic_sds_phy {
 
 	struct sci_base_state_machine starting_substate_machine;
 
-   #ifdef SCIC_DEBUG_ENABLED
-	struct scic_sds_phy_state_record state_record;
-   #endif /* SCIC_DEBUG_ENABLED */
-
 	/**
 	 * This field points to the link layer register set within the SCU.
 	 */

drivers/scsi/isci/core/scic_sds_port.c

@@ -974,19 +974,6 @@ static void scic_sds_port_timeout_handler(void *port)
 
 /* --------------------------------------------------------------------------- */
 
-#ifdef SCIC_DEBUG_ENABLED
-void scic_sds_port_decrement_request_count(struct scic_sds_port *this_port)
-{
-	if (this_port->started_request_count == 0)
-		dev_warn(sciport_to_dev(this_port),
-			 __func__,
-			 "%s: SCIC Port object requested to decrement started "
-			 "io count past zero.\n");
-	else
-		this_port->started_request_count--;
-}
-#endif
-
 /**
  * This function updates the hardwares VIIT entry for this port.
  *

drivers/scsi/isci/core/scic_sds_port.h

@@ -63,6 +63,7 @@
  *
  */
 
+#include <linux/kernel.h>
 #include "sci_controller_constants.h"
 #include "intel_sas.h"
 #include "sci_base_port.h"
@@ -286,40 +287,21 @@ extern struct scic_sds_port_state_handler scic_sds_port_ready_substate_handler_t
 #define scic_sds_port_get_index(this_port) \
 	((this_port)->physical_port_index)
 
-/**
- * scic_sds_port_increment_request_count() -
- *
- * Helper macro to increment the started request count
- */
-#define scic_sds_port_increment_request_count(this_port) \
-	((this_port)->started_request_count++)
 
-#ifdef SCIC_DEBUG_ENABLED
-/**
- * scic_sds_port_decrement_request_count() - This method decrements the started
- *    io request count.  The method will not decrment the started io request
- *    count below 0 and will log a debug message if this is attempted.
- *
- *
- */
-void scic_sds_port_decrement_request_count(
-	struct scic_sds_port *this_port);
-#else
-/**
- * scic_sds_port_decrement_request_count() -
- *
- * Helper macro to decrement the started io request count.  The macro will not
- * decrement the started io request count below 0.
- */
-#define scic_sds_port_decrement_request_count(this_port) \
-	(\
-		(this_port)->started_request_count = (\
-			((this_port)->started_request_count == 0) ? \
-			(this_port)->started_request_count : \
-			((this_port)->started_request_count - 1) \
-			) \
-			)
-#endif
+static inline void scic_sds_port_increment_request_count(struct scic_sds_port *sci_port)
+{
+	sci_port->started_request_count++;
+}
+
+static inline void scic_sds_port_decrement_request_count(struct scic_sds_port *sci_port)
+{
+	if (WARN_ONCE(sci_port->started_request_count == 0,
+		       "%s: tried to decrement started_request_count past 0!?",
+			__func__))
+		/* pass */;
+	else
+		sci_port->started_request_count--;
+}
 
 /**
  * scic_sds_port_write_phy_assignment() -