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Commit afb1bbee authored by Bob Moore's avatar Bob Moore Committed by Rafael J. Wysocki
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ACPICA: Resources: New interface, AcpiWalkResourceBuffer. 



Implements a new interface for walking resource lists that it at
a lower level than the existing AcpiWalkResources.  (Method is
not executed.)

Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 1cd4e951

drivers/acpi/acpica/rsxface.c

+70 −31
Original line number Diff line number Diff line
@@ -423,7 +423,7 @@ ACPI_EXPORT_SYMBOL(acpi_resource_to_address64) 
 *

 * RETURN:      Status

 *

 * DESCRIPTION: Walk a resource template for the specified evice to find a

 * DESCRIPTION: Walk a resource template for the specified device to find a

 *              vendor-defined resource that matches the supplied UUID and

 *              UUID subtype. Returns a struct acpi_resource of type Vendor.

 *
@@ -522,57 +522,42 @@ acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context) 


/*******************************************************************************

 *

 * FUNCTION:    acpi_walk_resources

 * FUNCTION:    acpi_walk_resource_buffer

 *

 * PARAMETERS:  device_handle   - Handle to the device object for the

 *                                device we are querying

 *              name            - Method name of the resources we want.

 *                                (METHOD_NAME__CRS, METHOD_NAME__PRS, or

 *                                METHOD_NAME__AEI)

 * PARAMETERS:  buffer          - Formatted buffer returned by one of the

 *                                various Get*Resource functions

 *              user_function   - Called for each resource

 *              context         - Passed to user_function

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Retrieves the current or possible resource list for the

 *              specified device. The user_function is called once for

 *              each resource in the list.

 * DESCRIPTION: Walks the input resource template. The user_function is called

 *              once for each resource in the list.

 *

 ******************************************************************************/



acpi_status

acpi_walk_resources(acpi_handle device_handle,

		    char *name,

		    acpi_walk_resource_callback user_function, void *context)

acpi_walk_resource_buffer(struct acpi_buffer * buffer,

			  acpi_walk_resource_callback user_function,

			  void *context)

{

	acpi_status status;

	struct acpi_buffer buffer;

	acpi_status status = AE_OK;

	struct acpi_resource *resource;

	struct acpi_resource *resource_end;



	ACPI_FUNCTION_TRACE(acpi_walk_resources);

	ACPI_FUNCTION_TRACE(acpi_walk_resource_buffer);



	/* Parameter validation */



	if (!device_handle || !user_function || !name ||

	    (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&

	     !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS) &&

	     !ACPI_COMPARE_NAME(name, METHOD_NAME__AEI))) {

	if (!buffer || !buffer->pointer || !user_function) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}



	/* Get the _CRS/_PRS/_AEI resource list */



	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;

	status = acpi_rs_get_method_data(device_handle, name, &buffer);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	/* Buffer now contains the resource list */

	/* Buffer contains the resource list and length */



	resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);

	resource = ACPI_CAST_PTR(struct acpi_resource, buffer->pointer);

	resource_end =

	    ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);

	    ACPI_ADD_PTR(struct acpi_resource, buffer->pointer, buffer->length);



	/* Walk the resource list until the end_tag is found (or buffer end) */
@@ -609,6 +594,60 @@ acpi_walk_resources(acpi_handle device_handle, 
		resource = ACPI_NEXT_RESOURCE(resource);

	}



	return_ACPI_STATUS(status);

}



ACPI_EXPORT_SYMBOL(acpi_walk_resource_buffer)



/*******************************************************************************

 *

 * FUNCTION:    acpi_walk_resources

 *

 * PARAMETERS:  device_handle   - Handle to the device object for the

 *                                device we are querying

 *              name            - Method name of the resources we want.

 *                                (METHOD_NAME__CRS, METHOD_NAME__PRS, or

 *                                METHOD_NAME__AEI)

 *              user_function   - Called for each resource

 *              context         - Passed to user_function

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Retrieves the current or possible resource list for the

 *              specified device. The user_function is called once for

 *              each resource in the list.

 *

 ******************************************************************************/

acpi_status

acpi_walk_resources(acpi_handle device_handle,

		    char *name,

		    acpi_walk_resource_callback user_function, void *context)

{

	acpi_status status;

	struct acpi_buffer buffer;



	ACPI_FUNCTION_TRACE(acpi_walk_resources);



	/* Parameter validation */



	if (!device_handle || !user_function || !name ||

	    (!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&

	     !ACPI_COMPARE_NAME(name, METHOD_NAME__PRS) &&

	     !ACPI_COMPARE_NAME(name, METHOD_NAME__AEI))) {

		return_ACPI_STATUS(AE_BAD_PARAMETER);

	}



	/* Get the _CRS/_PRS/_AEI resource list */



	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;

	status = acpi_rs_get_method_data(device_handle, name, &buffer);

	if (ACPI_FAILURE(status)) {

		return_ACPI_STATUS(status);

	}



	/* Walk the resource list and cleanup */



	status = acpi_walk_resource_buffer(&buffer, user_function, context);

	ACPI_FREE(buffer.pointer);

	return_ACPI_STATUS(status);

}

include/acpi/acpixf.h

+5 −0
Original line number Diff line number Diff line
@@ -443,6 +443,11 @@ acpi_status 
acpi_get_event_resources(acpi_handle device_handle,

			 struct acpi_buffer *ret_buffer);



acpi_status

acpi_walk_resource_buffer(struct acpi_buffer *buffer,

			  acpi_walk_resource_callback user_function,

			  void *context);



acpi_status

acpi_walk_resources(acpi_handle device,

		    char *name,

include/acpi/actypes.h

+4 −0
Original line number Diff line number Diff line
@@ -881,6 +881,10 @@ struct acpi_buffer { 
	void *pointer;		/* pointer to buffer */

};



/* Free a buffer created in an struct acpi_buffer via ACPI_ALLOCATE_LOCAL_BUFFER */



#define ACPI_FREE_BUFFER(b)         ACPI_FREE(b.pointer)



/*

 * name_type for acpi_get_name

 */