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authorSuthikulpanit, Suravee <Suravee.Suthikulpanit@amd.com>2015-10-28 15:50:48 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-11-07 01:29:21 +0100
commitb84f196d963c3159329f72ca1913b08679004a43 (patch)
treea017e66514453e0fdc5489076877d1a02a5e568a
parent1b9863c6aa56d92126ec0d5c42eae25df52b7ca1 (diff)
ACPI: Adding DMA Attribute APIs for ACPI Device
Adding acpi_get_dma_attr() to query DMA attributes of ACPI devices. It returns the enum dev_dma_attr, which communicates DMA information more clearly. This API replaces the acpi_check_dma(), which will be removed in subsequent patch. This patch also provides a convenient function, acpi_dma_supported(), to check DMA support of the specified ACPI device. Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/acpi/scan.c42
-rw-r--r--include/acpi/acpi_bus.h3
-rw-r--r--include/linux/acpi.h10
3 files changed, 55 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index d1ce377db3e9..ed3d76fadccf 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1308,6 +1308,48 @@ void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
kfree(pnp->unique_id);
}
+/**
+ * acpi_dma_supported - Check DMA support for the specified device.
+ * @adev: The pointer to acpi device
+ *
+ * Return false if DMA is not supported. Otherwise, return true
+ */
+bool acpi_dma_supported(struct acpi_device *adev)
+{
+ if (!adev)
+ return false;
+
+ if (adev->flags.cca_seen)
+ return true;
+
+ /*
+ * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
+ * DMA on "Intel platforms". Presumably that includes all x86 and
+ * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
+ */
+ if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
+ return true;
+
+ return false;
+}
+
+/**
+ * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
+ * @adev: The pointer to acpi device
+ *
+ * Return enum dev_dma_attr.
+ */
+enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
+{
+ if (!acpi_dma_supported(adev))
+ return DEV_DMA_NOT_SUPPORTED;
+
+ if (adev->flags.coherent_dma)
+ return DEV_DMA_COHERENT;
+ else
+ return DEV_DMA_NON_COHERENT;
+}
+
static void acpi_init_coherency(struct acpi_device *adev)
{
unsigned long long cca = 0;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 8df990520304..e56e6520edce 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -596,6 +596,9 @@ struct acpi_pci_root {
/* helper */
+bool acpi_dma_supported(struct acpi_device *adev);
+enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
+
struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
u64 address, bool check_children);
int acpi_is_root_bridge(acpi_handle);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 496265b0f527..292af3b69ede 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -579,6 +579,16 @@ static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
return false;
}
+static inline bool acpi_dma_supported(struct acpi_device *adev)
+{
+ return false;
+}
+
+static inline enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
+{
+ return DEV_DMA_NOT_SUPPORTED;
+}
+
#define ACPI_PTR(_ptr) (NULL)
#endif /* !CONFIG_ACPI */

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