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authorSuthikulpanit, Suravee <Suravee.Suthikulpanit@amd.com>2015-06-10 11:08:52 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-15 14:40:48 +0200
commitd0562674838c08ff142c0e9a8e12634e133c4361 (patch)
tree969dc352b9de229af3248a5ea11830c1db9eedaf /drivers/acpi/glue.c
parentfaacd5ad83857300df4b7b1814ef2eb963063c14 (diff)
downloadlinux-d0562674838c08ff142c0e9a8e12634e133c4361.tar.bz2
ACPI / scan: Parse _CCA and setup device coherency
This patch implements support for ACPI _CCA object, which is introduced in ACPIv5.1, can be used for specifying device DMA coherency attribute. The parsing logic traverses device namespace to parse coherency information, and stores it in acpi_device_flags. Then uses it to call arch_setup_dma_ops() when creating each device enumerated in DSDT during ACPI scan. This patch also introduces acpi_dma_is_coherent(), which provides an interface for device drivers to check the coherency information similarly to the of_dma_is_coherent(). Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/glue.c')
-rw-r--r--drivers/acpi/glue.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 39c485b0c25c..b9657af751d1 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -13,6 +13,7 @@
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/acpi.h>
+#include <linux/dma-mapping.h>
#include "internal.h"
@@ -167,6 +168,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
struct list_head *physnode_list;
unsigned int node_id;
int retval = -EINVAL;
+ bool coherent;
if (has_acpi_companion(dev)) {
if (acpi_dev) {
@@ -223,6 +225,9 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
if (!has_acpi_companion(dev))
ACPI_COMPANION_SET(dev, acpi_dev);
+ if (acpi_check_dma(acpi_dev, &coherent))
+ arch_setup_dma_ops(dev, 0, 0, NULL, coherent);
+
acpi_physnode_link_name(physical_node_name, node_id);
retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
physical_node_name);