From: Bob Moore <robert.moore@intel.com>
Date: Thu, 3 Aug 2017 14:27:35 +0800
Subject: ACPICA: Resources: Allow _DMA method in walk resources
Patch-mainline: v4.14-rc1
Git-commit: 137c78352ea98db70d0f2aa648f723bb444faee8
References: bsc#1117419

ACPICA commit af661c00afac7aa481a961fa48c6540a99ad64a6

The _DMA object contains a resource template, this change
adds support for the walk resources function so that ACPI
devices containing a _DMA object can actually parse it to
detect DMA ranges for the respective bus.

Link: https://github.com/acpica/acpica/commit/af661c00
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 drivers/acpi/acpica/rsxface.c |    7 ++++---
 include/acpi/acnames.h        |    1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/acpi/acpica/rsxface.c
+++ b/drivers/acpi/acpica/rsxface.c
@@ -615,7 +615,7 @@ ACPI_EXPORT_SYMBOL(acpi_walk_resource_bu
  *                                device we are querying
  *              name            - Method name of the resources we want.
  *                                (METHOD_NAME__CRS, METHOD_NAME__PRS, or
- *                                METHOD_NAME__AEI)
+ *                                METHOD_NAME__AEI or METHOD_NAME__DMA)
  *              user_function   - Called for each resource
  *              context         - Passed to user_function
  *
@@ -641,11 +641,12 @@ acpi_walk_resources(acpi_handle device_h
 	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))) {
+	     !ACPI_COMPARE_NAME(name, METHOD_NAME__AEI) &&
+	     !ACPI_COMPARE_NAME(name, METHOD_NAME__DMA))) {
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
 
-	/* Get the _CRS/_PRS/_AEI resource list */
+	/* Get the _CRS/_PRS/_AEI/_DMA resource list */
 
 	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 	status = acpi_rs_get_method_data(device_handle, name, &buffer);
--- a/include/acpi/acnames.h
+++ b/include/acpi/acnames.h
@@ -54,6 +54,7 @@
 #define METHOD_NAME__CLS        "_CLS"
 #define METHOD_NAME__CRS        "_CRS"
 #define METHOD_NAME__DDN        "_DDN"
+#define METHOD_NAME__DMA        "_DMA"
 #define METHOD_NAME__HID        "_HID"
 #define METHOD_NAME__INI        "_INI"
 #define METHOD_NAME__PLD        "_PLD"