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: Bob Moore <robert.moore@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -423,7 +423,7 @@ ACPI_EXPORT_SYMBOL(acpi_resource_to_address64)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Walk a resource template for the specified evice to find a
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* DESCRIPTION: Walk a resource template for the specified device to find a
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* vendor-defined resource that matches the supplied UUID and
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* UUID subtype. Returns a struct acpi_resource of type Vendor.
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*
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@ -522,57 +522,42 @@ acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context)
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/*******************************************************************************
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*
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* FUNCTION: acpi_walk_resources
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* FUNCTION: acpi_walk_resource_buffer
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*
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* PARAMETERS: device_handle - Handle to the device object for the
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* device we are querying
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* name - Method name of the resources we want.
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* (METHOD_NAME__CRS, METHOD_NAME__PRS, or
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* METHOD_NAME__AEI)
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* PARAMETERS: buffer - Formatted buffer returned by one of the
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* various Get*Resource functions
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* user_function - Called for each resource
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* context - Passed to user_function
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*
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* RETURN: Status
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*
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* DESCRIPTION: Retrieves the current or possible resource list for the
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* specified device. The user_function is called once for
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* each resource in the list.
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* DESCRIPTION: Walks the input resource template. The user_function is called
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* once for each resource in the list.
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*
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******************************************************************************/
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acpi_status
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acpi_walk_resources(acpi_handle device_handle,
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char *name,
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acpi_walk_resource_callback user_function, void *context)
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acpi_walk_resource_buffer(struct acpi_buffer * buffer,
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acpi_walk_resource_callback user_function,
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void *context)
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{
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acpi_status status;
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struct acpi_buffer buffer;
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acpi_status status = AE_OK;
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struct acpi_resource *resource;
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struct acpi_resource *resource_end;
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ACPI_FUNCTION_TRACE(acpi_walk_resources);
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ACPI_FUNCTION_TRACE(acpi_walk_resource_buffer);
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/* Parameter validation */
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if (!device_handle || !user_function || !name ||
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(!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
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!ACPI_COMPARE_NAME(name, METHOD_NAME__PRS) &&
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!ACPI_COMPARE_NAME(name, METHOD_NAME__AEI))) {
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if (!buffer || !buffer->pointer || !user_function) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Get the _CRS/_PRS/_AEI resource list */
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/* Buffer contains the resource list and length */
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buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
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status = acpi_rs_get_method_data(device_handle, name, &buffer);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Buffer now contains the resource list */
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resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
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resource = ACPI_CAST_PTR(struct acpi_resource, buffer->pointer);
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resource_end =
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ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);
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ACPI_ADD_PTR(struct acpi_resource, buffer->pointer, buffer->length);
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/* Walk the resource list until the end_tag is found (or buffer end) */
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@ -609,6 +594,60 @@ acpi_walk_resources(acpi_handle device_handle,
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resource = ACPI_NEXT_RESOURCE(resource);
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}
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_walk_resource_buffer)
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/*******************************************************************************
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*
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* FUNCTION: acpi_walk_resources
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*
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* PARAMETERS: device_handle - Handle to the device object for the
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* device we are querying
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* name - Method name of the resources we want.
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* (METHOD_NAME__CRS, METHOD_NAME__PRS, or
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* METHOD_NAME__AEI)
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* user_function - Called for each resource
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* context - Passed to user_function
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*
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* RETURN: Status
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*
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* DESCRIPTION: Retrieves the current or possible resource list for the
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* specified device. The user_function is called once for
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* each resource in the list.
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*
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******************************************************************************/
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acpi_status
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acpi_walk_resources(acpi_handle device_handle,
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char *name,
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acpi_walk_resource_callback user_function, void *context)
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{
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acpi_status status;
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struct acpi_buffer buffer;
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ACPI_FUNCTION_TRACE(acpi_walk_resources);
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/* Parameter validation */
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if (!device_handle || !user_function || !name ||
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(!ACPI_COMPARE_NAME(name, METHOD_NAME__CRS) &&
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!ACPI_COMPARE_NAME(name, METHOD_NAME__PRS) &&
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!ACPI_COMPARE_NAME(name, METHOD_NAME__AEI))) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Get the _CRS/_PRS/_AEI resource list */
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buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
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status = acpi_rs_get_method_data(device_handle, name, &buffer);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Walk the resource list and cleanup */
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status = acpi_walk_resource_buffer(&buffer, user_function, context);
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ACPI_FREE(buffer.pointer);
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return_ACPI_STATUS(status);
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}
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@ -443,6 +443,11 @@ acpi_status
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acpi_get_event_resources(acpi_handle device_handle,
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struct acpi_buffer *ret_buffer);
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acpi_status
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acpi_walk_resource_buffer(struct acpi_buffer *buffer,
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acpi_walk_resource_callback user_function,
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void *context);
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acpi_status
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acpi_walk_resources(acpi_handle device,
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char *name,
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@ -881,6 +881,10 @@ struct acpi_buffer {
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void *pointer; /* pointer to buffer */
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};
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/* Free a buffer created in an struct acpi_buffer via ACPI_ALLOCATE_LOCAL_BUFFER */
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#define ACPI_FREE_BUFFER(b) ACPI_FREE(b.pointer)
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/*
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* name_type for acpi_get_name
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*/
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