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arm64 : Introduce support for ACPI _CCA object

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section 6.2.17 _CCA states that ARM platforms require ACPI _CCA
object to be specified for DMA-cabpable devices. Therefore, this patch
specifies ACPI_CCA_REQUIRED in arm64 Kconfig.

In addition, to handle the case when _CCA is missing, arm64 would assign
dummy_dma_ops to disable DMA capability of the device.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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>
This commit is contained in:
Suthikulpanit, Suravee
2015-06-10 11:08:53 -05:00
committed by Rafael J. Wysocki
parent d056267483
commit b6197b93fa
3 changed files with 109 additions and 2 deletions
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18
arch/arm64/include/asm/dma-mapping.h
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@@ -18,6 +18,7 @@
#ifdef __KERNEL__
#include <linux/acpi.h>
#include <linux/types.h>
#include <linux/vmalloc.h>
@@ -28,13 +29,23 @@
#define DMA_ERROR_CODE (~(dma_addr_t)0)
extern struct dma_map_ops *dma_ops;
extern struct dma_map_ops dummy_dma_ops;
static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
{
if (unlikely(!dev) || !dev->archdata.dma_ops)
if (unlikely(!dev))
return dma_ops;
else
else if (dev->archdata.dma_ops)
return dev->archdata.dma_ops;
else if (acpi_disabled)
return dma_ops;
/*
* When ACPI is enabled, if arch_set_dma_ops is not called,
* we will disable device DMA capability by setting it
* to dummy_dma_ops.
*/
return &dummy_dma_ops;
}
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
@@ -48,6 +59,9 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
struct iommu_ops *iommu, bool coherent)
{
if (!acpi_disabled && !dev->archdata.dma_ops)
dev->archdata.dma_ops = dma_ops;
dev->archdata.dma_coherent = coherent;
}
#define arch_setup_dma_ops arch_setup_dma_ops