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Subject[PATCH v4 3/7] [RFC] arm/arm64: introduce is_dma_coherent
Date
Introduce a function to check whether a device is dma coherent.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: linux@arm.linux.org.uk
CC: catalin.marinas@arm.com
CC: will.deacon@arm.com
CC: linux-arm-kernel@lists.infradead.org
---
arch/arm/include/asm/dma-mapping.h | 6 ++++++
arch/arm64/include/asm/dma-mapping.h | 5 +++++
2 files changed, 11 insertions(+)

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index c45b61a..bededbb 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -126,6 +126,12 @@ static inline int set_arch_dma_coherent_ops(struct device *dev)
set_dma_ops(dev, &arm_coherent_dma_ops);
return 0;
}
+
+static inline bool is_dma_coherent(struct device *dev)
+{
+ return (__generic_dma_ops(dev) == &arm_coherent_dma_ops);
+}
+
#define set_arch_dma_coherent_ops(dev) set_arch_dma_coherent_ops(dev)

static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index dc82e52..d51d67e 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -52,6 +52,11 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
dev->archdata.dma_ops = ops;
}

+static inline bool is_dma_coherent(struct device *dev)
+{
+ return (__generic_dma_ops(dev) == &coherent_swiotlb_dma_ops);
+}
+
#include <asm-generic/dma-mapping-common.h>

static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
--
1.7.10.4


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