isci: remove scic_controller_get_handler_methods and ilk

This removes scic_controller_get_handler_methods and its
associated unused code.

Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
[djbw: kill off the legacy handler, now that we have basic error isr support]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

4 files changed, 2 insertions, 525 deletions

diff --git a/drivers/scsi/isci/core/scic_controller.h b/drivers/scsi/isci/core/scic_controller.h
index 1d459d6af21b..481e0de5148b 100644
--- a/drivers/scsi/isci/core/scic_controller.h
+++ b/drivers/scsi/isci/core/scic_controller.h
@@ -81,62 +81,6 @@ enum sci_controller_mode {
 
 
 /**
- * enum _SCIC_INTERRUPT_TYPE - This enumeration depicts the various types of
- *    interrupts that are potentially supported by a SCI Core implementation.
- *
- *
- */
-enum scic_interrupt_type {
-	SCIC_LEGACY_LINE_INTERRUPT_TYPE,
-	SCIC_MSIX_INTERRUPT_TYPE,
-
-	/**
-	 * This enumeration value indicates the use of polling.
-	 */
-	SCIC_NO_INTERRUPTS
-
-};
-
-/**
- * This method is called by the SCI user in order to have the SCI
- *    implementation handle the interrupt.  This method performs minimal
- *    processing to allow for streamlined interrupt time usage.
- *
- * SCIC_CONTROLLER_INTERRUPT_HANDLER true: returned if there is an interrupt to
- * process and it was processed. false: returned if no interrupt was processed.
- */
-typedef bool (*SCIC_CONTROLLER_INTERRUPT_HANDLER)(
-	struct scic_sds_controller *controller
-	);
-
-/**
- * This method is called by the SCI user to process completions generated as a
- *    result of a previously handled interrupt.  This method will result in the
- *    completion of IO requests and handling of other controller generated
- *    events.  This method should be called some time after the interrupt
- *    handler.
- *
- * Most, if not all, of the user callback APIs are invoked from within this
- * API.  As a result, the user should be cognizent of the operating level at
- * which they invoke this API.
- */
-typedef void (*SCIC_CONTROLLER_COMPLETION_HANDLER)(
-	struct scic_sds_controller *controller
-	);
-
-/**
- * struct scic_controller_handler_methods - This structure contains an
- *    interrupt handler and completion handler function pointers.
- *
- *
- */
-struct scic_controller_handler_methods {
-	SCIC_CONTROLLER_INTERRUPT_HANDLER interrupt_handler;
-	SCIC_CONTROLLER_COMPLETION_HANDLER completion_handler;
-
-};
-
-/**
  * scic_controller_construct() - This method will attempt to construct a
  *    controller object utilizing the supplied parameter information.
  * @c: This parameter specifies the controller to be constructed.
@@ -176,47 +120,6 @@ void scic_controller_enable_interrupts(
 void scic_controller_disable_interrupts(
 	struct scic_sds_controller *controller);
 
-/**
- * scic_controller_get_handler_methods() - This method will return provide
- *    function pointers for the interrupt handler and completion handler.  The
- *    interrupt handler is expected to be invoked at interrupt time.  The
- *    completion handler is scheduled to run as a result of the interrupt
- *    handler. The completion handler performs the bulk work for processing
- *    silicon events.
- * @interrupt_type: This parameter informs the core which type of
- *    interrupt/completion methods are being requested. These are the types:
- *    SCIC_LEGACY_LINE_INTERRUPT_TYPE, SCIC_MSIX_INTERRUPT_TYPE,
- *    SCIC_NO_INTERRUPTS (POLLING)
- * @message_count: This parameter informs the core the number of MSI-X messages
- *    to be utilized.  This parameter must be 0 when requesting legacy line
- *    based handlers.
- * @handler_methods: The caller provides a pointer to a buffer of type
- *    struct scic_controller_handler_methods. The size depends on the combination of
- *    the interrupt_type and message_count input parameters:
- *    SCIC_LEGACY_LINE_INTERRUPT_TYPE: - size =
- *    sizeof(struct scic_controller_handler_methods) SCIC_MSIX_INTERRUPT_TYPE:
- *    sizeof(struct scic_controller_handler_methods)
- * @handler_methods: SCIC fills out the caller's buffer with the appropriate
- *    interrupt and completion handlers based on the info provided in the
- *    interrupt_type and message_count input parameters. For
- *    SCIC_LEGACY_LINE_INTERRUPT_TYPE, the buffer receives a single
- *    struct scic_controller_handler_methods element regardless that the
- *    message_count parameter is zero. For SCIC_MSIX_INTERRUPT_TYPE, the buffer
- *    receives an array of elements of type struct scic_controller_handler_methods
- *    where the array size is equivalent to the message_count parameter. The
- *    array is zero-relative where entry zero corresponds to message-vector
- *    zero, entry one corresponds to message-vector one, and so forth.
- *
- * Indicate if the handler retrieval operation was successful. SCI_SUCCESS This
- * value is returned if retrieval succeeded.
- * SCI_FAILURE_UNSUPPORTED_MESSAGE_COUNT This value is returned if the user
- * supplied an unsupported number of MSI-X messages. For legacy line interrupts
- * the only valid value is 0.
- */
-enum sci_status scic_controller_get_handler_methods(
-	enum scic_interrupt_type interrupt_type,
-	u16 message_count,
-	struct scic_controller_handler_methods *handler_methods);
 
 /**
  * scic_controller_initialize() - This method will initialize the controller
diff --git a/drivers/scsi/isci/core/scic_sds_controller.c b/drivers/scsi/isci/core/scic_sds_controller.c
index 7ea36624f568..53861ccbd593 100644
--- a/drivers/scsi/isci/core/scic_sds_controller.c
+++ b/drivers/scsi/isci/core/scic_sds_controller.c
@@ -1564,340 +1564,6 @@ static void scic_sds_controller_process_completions(
 
 }
 
-/**
- * This method is a private routine for processing the completion queue entries.
- * @this_controller:
- *
- */
-static void scic_sds_controller_transitioned_process_completions(
-	struct scic_sds_controller *this_controller)
-{
-	u32 completion_count = 0;
-	u32 completion_entry;
-	u32 get_index;
-	u32 get_cycle;
-	u32 event_index;
-	u32 event_cycle;
-
-	dev_dbg(scic_to_dev(this_controller),
-		"%s: completion queue begining get:0x%08x\n",
-		__func__,
-		this_controller->completion_queue_get);
-
-	/* Get the component parts of the completion queue */
-	get_index = NORMALIZE_GET_POINTER(this_controller->completion_queue_get);
-	get_cycle = SMU_CQGR_CYCLE_BIT & this_controller->completion_queue_get;
-
-	event_index = NORMALIZE_EVENT_POINTER(this_controller->completion_queue_get);
-	event_cycle = SMU_CQGR_EVENT_CYCLE_BIT & this_controller->completion_queue_get;
-
-	while (
-		NORMALIZE_GET_POINTER_CYCLE_BIT(get_cycle)
-		== COMPLETION_QUEUE_CYCLE_BIT(
-			this_controller->completion_queue[get_index])
-		) {
-		completion_count++;
-
-		completion_entry = this_controller->completion_queue[get_index];
-		INCREMENT_COMPLETION_QUEUE_GET(this_controller, get_index, get_cycle);
-
-		dev_dbg(scic_to_dev(this_controller),
-			"%s: completion queue entry:0x%08x\n",
-			__func__,
-			completion_entry);
-
-		switch (SCU_GET_COMPLETION_TYPE(completion_entry)) {
-		case SCU_COMPLETION_TYPE_TASK:
-			scic_sds_controller_task_completion(this_controller, completion_entry);
-			break;
-
-		case SCU_COMPLETION_TYPE_NOTIFY:
-		case SCU_COMPLETION_TYPE_EVENT:
-			/*
-			 * Presently we do the same thing with a notify event that we
-			 * do with the other event codes. */
-			INCREMENT_EVENT_QUEUE_GET(this_controller, event_index, event_cycle);
-		/* Fall-through */
-
-		case SCU_COMPLETION_TYPE_SDMA:
-		case SCU_COMPLETION_TYPE_UFI:
-		default:
-			dev_warn(scic_to_dev(this_controller),
-				 "%s: SCIC Controller ignoring completion type "
-				 "%x\n",
-				 __func__,
-				 completion_entry);
-			break;
-		}
-	}
-
-	/* Update the get register if we completed one or more entries */
-	if (completion_count > 0) {
-		this_controller->completion_queue_get =
-			SMU_CQGR_GEN_BIT(ENABLE)
-			| SMU_CQGR_GEN_BIT(EVENT_ENABLE)
-			| event_cycle | SMU_CQGR_GEN_VAL(EVENT_POINTER, event_index)
-			| get_cycle   | SMU_CQGR_GEN_VAL(POINTER, get_index);
-
-		SMU_CQGR_WRITE(this_controller, this_controller->completion_queue_get);
-	}
-
-	dev_dbg(scic_to_dev(this_controller),
-		"%s: completion queue ending get:0x%08x\n",
-		__func__,
-		this_controller->completion_queue_get);
-}
-
-/*
- * ****************************************************************************-
- * * SCIC SDS Controller Interrupt and Completion functions
- * ****************************************************************************- */
-
-/**
- * This method provides standard (common) processing of interrupts for polling
- *    and legacy based interrupts.
- * @controller:
- * @interrupt_status:
- *
- * This method returns a boolean (bool) indication as to whether an completions
- * are pending to be processed. true if an interrupt is to be processed false
- * if no interrupt was pending
- */
-static bool scic_sds_controller_standard_interrupt_handler(
-	struct scic_sds_controller *this_controller,
-	u32 interrupt_status)
-{
-	bool is_completion_needed = false;
-
-	if ((interrupt_status & SMU_ISR_QUEUE_ERROR) ||
-	    ((interrupt_status & SMU_ISR_QUEUE_SUSPEND) &&
-	     (!scic_sds_controller_completion_queue_has_entries(
-							this_controller)))) {
-		/*
-		 * We have a fatal error on the read of the completion queue bar
-		 * OR
-		 * We have a fatal error there is nothing in the completion queue
-		 * but we have a report from the hardware that the queue is full
-		 * / @todo how do we request the a controller reset */
-		is_completion_needed = true;
-		this_controller->encountered_fatal_error = true;
-	}
-
-	if (scic_sds_controller_completion_queue_has_entries(this_controller)) {
-		is_completion_needed = true;
-	}
-
-	return is_completion_needed;
-}
-
-/**
- * This is the method provided to handle polling for interrupts for the
- *    controller object.
- *
- * bool true if an interrupt is to be processed false if no interrupt was
- * pending
- */
-static bool scic_sds_controller_polling_interrupt_handler(
-	struct scic_sds_controller *scic)
-{
-	u32 interrupt_status;
-
-	/*
-	 * In INTERRUPT_POLLING_MODE we exit the interrupt handler if the
-	 * hardware indicates nothing is pending. Since we are not being
-	 * called from a real interrupt, we don't want to confuse the hardware
-	 * by servicing the completion queue before the hardware indicates it
-	 * is ready. We'll simply wait for another polling interval and check
-	 * again.
-	 */
-	interrupt_status = SMU_ISR_READ(scic);
-	if ((interrupt_status &
-	     (SMU_ISR_COMPLETION |
-	      SMU_ISR_QUEUE_ERROR |
-	      SMU_ISR_QUEUE_SUSPEND)) == 0) {
-		return false;
-	}
-
-	return scic_sds_controller_standard_interrupt_handler(
-		       scic, interrupt_status);
-}
-
-/**
- * This is the method provided to handle completions when interrupt polling is
- *    in use.
- */
-static void scic_sds_controller_polling_completion_handler(
-	struct scic_sds_controller *scic)
-{
-	if (scic->encountered_fatal_error == true) {
-		dev_err(scic_to_dev(scic),
-			"%s: SCIC Controller has encountered a fatal error.\n",
-			__func__);
-
-		sci_base_state_machine_change_state(
-			scic_sds_controller_get_base_state_machine(scic),
-			SCI_BASE_CONTROLLER_STATE_FAILED);
-	} else if (scic_sds_controller_completion_queue_has_entries(scic)) {
-		if (scic->restrict_completions == false)
-			scic_sds_controller_process_completions(scic);
-		else
-			scic_sds_controller_transitioned_process_completions(
-				scic);
-	}
-
-	/*
-	 * The interrupt handler does not adjust the CQ's
-	 * get pointer.  So, SCU's INTx pin stays asserted during the
-	 * interrupt handler even though it tries to clear the interrupt
-	 * source.  Therefore, the completion handler must ensure that the
-	 * interrupt source is cleared.  Otherwise, we get a spurious
-	 * interrupt for which the interrupt handler will not issue a
-	 * corresponding completion event. Also, we unmask interrupts.
-	 */
-	SMU_ISR_WRITE(
-		scic,
-		(u32)(SMU_ISR_COMPLETION | SMU_ISR_QUEUE_ERROR | SMU_ISR_QUEUE_SUSPEND)
-		);
-}
-
-/**
- * This is the method provided to handle legacy interrupts for the controller
- *    object.
- *
- * bool true if an interrupt is processed false if no interrupt was processed
- */
-static bool scic_sds_controller_legacy_interrupt_handler(
-	struct scic_sds_controller *scic)
-{
-	u32 interrupt_status;
-	bool is_completion_needed;
-
-	interrupt_status     = SMU_ISR_READ(scic);
-	is_completion_needed = scic_sds_controller_standard_interrupt_handler(
-		scic, interrupt_status);
-
-	return is_completion_needed;
-}
-
-
-/**
- * This is the method provided to handle legacy completions it is expected that
- *    the SCI User will call this completion handler anytime the interrupt
- *    handler reports that it has handled an interrupt.
- */
-static void scic_sds_controller_legacy_completion_handler(
-	struct scic_sds_controller *scic)
-{
-	scic_sds_controller_polling_completion_handler(scic);
-	SMU_IMR_WRITE(scic, 0x00000000);
-}
-
-/**
- * This is the method provided to handle an MSIX interrupt message when there
- *    is just a single MSIX message being provided by the hardware.  This mode
- *    of operation is single vector mode.
- *
- * bool true if an interrupt is processed false if no interrupt was processed
- */
-static bool scic_sds_controller_single_vector_interrupt_handler(
-	struct scic_sds_controller *scic)
-{
-	u32 interrupt_status;
-
-	/*
-	 * Mask the interrupts
-	 * There is a race in the hardware that could cause us not to be notified
-	 * of an interrupt completion if we do not take this step.  We will unmask
-	 * the interrupts in the completion routine. */
-	SMU_IMR_WRITE(scic, 0xFFFFFFFF);
-
-	interrupt_status = SMU_ISR_READ(scic);
-	interrupt_status &= (SMU_ISR_QUEUE_ERROR | SMU_ISR_QUEUE_SUSPEND);
-
-	if ((interrupt_status == 0) &&
-	    scic_sds_controller_completion_queue_has_entries(scic)) {
-		/*
-		 * There is at least one completion queue entry to process so we can
-		 * return a success and ignore for now the case of an error interrupt */
-		SMU_ISR_WRITE(scic, SMU_ISR_COMPLETION);
-		return true;
-	}
-
-	if (interrupt_status != 0) {
-		/*
-		 * There is an error interrupt pending so let it through and handle
-		 * in the callback */
-		return true;
-	}
-
-	/*
-	 * Clear any offending interrupts since we could not find any to handle
-	 * and unmask them all */
-	SMU_ISR_WRITE(scic, 0x00000000);
-	SMU_IMR_WRITE(scic, 0x00000000);
-
-	return false;
-}
-
-/**
- * This is the method provided to handle completions for a single MSIX message.
- */
-static void scic_sds_controller_single_vector_completion_handler(
-	struct scic_sds_controller *scic)
-{
-	u32 interrupt_status;
-
-	interrupt_status = SMU_ISR_READ(scic);
-	interrupt_status &= (SMU_ISR_QUEUE_ERROR | SMU_ISR_QUEUE_SUSPEND);
-
-	if (interrupt_status & SMU_ISR_QUEUE_ERROR) {
-		dev_err(scic_to_dev(scic),
-			"%s: SCIC Controller has encountered a fatal error.\n",
-			__func__);
-
-		/*
-		 * We have a fatal condition and must reset the controller
-		 * Leave the interrupt mask in place and get the controller reset */
-		sci_base_state_machine_change_state(
-			scic_sds_controller_get_base_state_machine(scic),
-			SCI_BASE_CONTROLLER_STATE_FAILED);
-		return;
-	}
-
-	if ((interrupt_status & SMU_ISR_QUEUE_SUSPEND) &&
-	    !scic_sds_controller_completion_queue_has_entries(scic)) {
-		dev_err(scic_to_dev(scic),
-			"%s: SCIC Controller has encountered a fatal error.\n",
-			__func__);
-
-		/*
-		 * We have a fatal condtion and must reset the controller
-		 * Leave the interrupt mask in place and get the controller reset */
-		sci_base_state_machine_change_state(
-			scic_sds_controller_get_base_state_machine(scic),
-			SCI_BASE_CONTROLLER_STATE_FAILED);
-		return;
-	}
-
-	if (scic_sds_controller_completion_queue_has_entries(scic)) {
-		scic_sds_controller_process_completions(scic);
-
-		/*
-		 * We dont care which interrupt got us to processing the completion queu
-		 * so clear them both. */
-		SMU_ISR_WRITE(
-			scic,
-			(SMU_ISR_COMPLETION | SMU_ISR_QUEUE_SUSPEND));
-	}
-
-	SMU_IMR_WRITE(scic, 0x00000000);
-}
-
-/**
- * This is the method provided to handle a MSIX message for a normal completion.
- *
- * bool true if an interrupt is processed false if no interrupt was processed
- */
 bool scic_sds_controller_isr(struct scic_sds_controller *scic)
 {
 	if (scic_sds_controller_completion_queue_has_entries(scic)) {
@@ -1920,10 +1586,6 @@ bool scic_sds_controller_isr(struct scic_sds_controller *scic)
 	return false;
 }
 
-/**
- * This is the method provided to handle the completions for a normal MSIX
- *    message.
- */
 void scic_sds_controller_completion_handler(struct scic_sds_controller *scic)
 {
 	/* Empty out the completion queue */
@@ -1994,14 +1656,6 @@ void scic_sds_controller_error_handler(struct scic_sds_controller *scic)
 }
 
 
-/*
- * ****************************************************************************-
- * * SCIC SDS Controller External Methods
- * ****************************************************************************- */
-
-/**
- * This method returns the sizeof the SCIC SDS Controller Object
- */
 u32 scic_sds_controller_get_object_size(void)
 {
 	return sizeof(struct scic_sds_controller);
@@ -2535,72 +2189,6 @@ enum sci_status scic_controller_reset(
 	return status;
 }
 
-/* --------------------------------------------------------------------------- */
-
-enum sci_status scic_controller_get_handler_methods(
-	enum scic_interrupt_type interrupt_type,
-	u16 message_count,
-	struct scic_controller_handler_methods *handler_methods)
-{
-	enum sci_status status = SCI_FAILURE_UNSUPPORTED_MESSAGE_COUNT;
-
-	switch (interrupt_type) {
-	case SCIC_LEGACY_LINE_INTERRUPT_TYPE:
-		if (message_count == 0) {
-			handler_methods[0].interrupt_handler
-				= scic_sds_controller_legacy_interrupt_handler;
-			handler_methods[0].completion_handler
-				= scic_sds_controller_legacy_completion_handler;
-
-			status = SCI_SUCCESS;
-		}
-		break;
-
-	case SCIC_MSIX_INTERRUPT_TYPE:
-		if (message_count == 1) {
-			handler_methods[0].interrupt_handler
-				= scic_sds_controller_single_vector_interrupt_handler;
-			handler_methods[0].completion_handler
-				= scic_sds_controller_single_vector_completion_handler;
-
-			status = SCI_SUCCESS;
-		} else if (message_count == 2) {
-			handler_methods[0].interrupt_handler
-				= scic_sds_controller_isr;
-			handler_methods[0].completion_handler
-				= scic_sds_controller_completion_handler;
-
-			handler_methods[1].interrupt_handler
-				= scic_sds_controller_error_isr;
-			handler_methods[1].completion_handler
-				= scic_sds_controller_error_handler;
-
-			status = SCI_SUCCESS;
-		}
-		break;
-
-	case SCIC_NO_INTERRUPTS:
-		if (message_count == 0) {
-
-			handler_methods[0].interrupt_handler
-				= scic_sds_controller_polling_interrupt_handler;
-			handler_methods[0].completion_handler
-				= scic_sds_controller_polling_completion_handler;
-
-			status = SCI_SUCCESS;
-		}
-		break;
-
-	default:
-		status = SCI_FAILURE_INVALID_PARAMETER_VALUE;
-		break;
-	}
-
-	return status;
-}
-
-/* --------------------------------------------------------------------------- */
-
 enum sci_io_status scic_controller_start_io(
 	struct scic_sds_controller *scic,
 	struct scic_sds_remote_device *remote_device,
diff --git a/drivers/scsi/isci/core/scic_sds_controller.h b/drivers/scsi/isci/core/scic_sds_controller.h
index cce0da6a6a3d..3e0477d62a5b 100644
--- a/drivers/scsi/isci/core/scic_sds_controller.h
+++ b/drivers/scsi/isci/core/scic_sds_controller.h
@@ -335,19 +335,6 @@ struct scic_sds_controller {
 	 */
 	struct scic_sds_unsolicited_frame_control uf_control;
 
-	/**
-	 * This field records the fact that the controller has encountered a fatal
-	 * error and must be reset.
-	 */
-	bool encountered_fatal_error;
-
-	/**
-	 * This field specifies that the controller should ignore
-	 * completion processing for non-fastpath events.  This will
-	 * cause the completions to be thrown away.
-	 */
-	bool restrict_completions;
-
 	/* Phy Startup Data */
 	/**
 	 * This field is the driver timer handle for controller phy request startup.
diff --git a/drivers/scsi/isci/core/scic_user_callback.h b/drivers/scsi/isci/core/scic_user_callback.h
index ec4eb278cd5f..d1a3cb885bc7 100644
--- a/drivers/scsi/isci/core/scic_user_callback.h
+++ b/drivers/scsi/isci/core/scic_user_callback.h
@@ -86,9 +86,8 @@ struct scic_sds_controller;
  *    occurs for the created timer.
  *
  * The "timer_callback" method should be executed in a mutually exlusive manner
- * from the controller completion handler handler (refer to
- * scic_controller_get_handler_methods()). This method returns a handle to a
- * timer object created by the user.  The handle will be utilized for all
+ * from the controller completion handler handler. This method returns a handle
+ * to a timer object created by the user.  The handle will be utilized for all
  * further interactions relating to this timer.
  */
 void *scic_cb_timer_create(