Introduce a simple utility function that returns whether a device is dma
coherent based on device tree information.
Signed-off-by: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
CC: catalin.mari...@arm.com
CC: will.dea...@arm.com
---
arch/arm/xen/mm32.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm/xen/mm32.c b/arch/arm/xen/mm32.c
index 6153d61..2b259f1 100644
--- a/arch/arm/xen/mm32.c
+++ b/arch/arm/xen/mm32.c
@@ -2,10 +2,16 @@
#include <linux/dma-mapping.h>
#include <linux/gfp.h>
#include <linux/highmem.h>
+#include <linux/of_address.h>
#include <xen/features.h>
+static inline bool is_dma_coherent(struct device *dev)
+{
+ return of_dma_is_coherent(dev->of_node);
+}
+
/* functions called by SWIOTLB */
static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
--
1.7.10.4
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