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ACPI: Adding DMA Attribute APIs for ACPI Device

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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>
This commit is contained in:
Suthikulpanit, Suravee
2015-10-28 15:50:48 -07:00
committed by Rafael J. Wysocki
parent 1b9863c6aa
commit b84f196d96
3 changed files with 55 additions and 0 deletions
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3
include/acpi/acpi_bus.h
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@@ -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);