arm: introduce is_device_dma_coherent
Introduce a boolean flag and an accessor function to check whether a
device is dma_coherent. Set the flag from set_arch_dma_coherent_ops.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Russell King <linux@arm.linux.org.uk>
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 85738b2..e6e3446 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -123,11 +123,18 @@
static inline int set_arch_dma_coherent_ops(struct device *dev)
{
+ dev->archdata.dma_coherent = true;
set_dma_ops(dev, &arm_coherent_dma_ops);
return 0;
}
#define set_arch_dma_coherent_ops(dev) set_arch_dma_coherent_ops(dev)
+/* do not use this function in a driver */
+static inline bool is_device_dma_coherent(struct device *dev)
+{
+ return dev->archdata.dma_coherent;
+}
+
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
unsigned int offset = paddr & ~PAGE_MASK;