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[v6,3/7] xen/arm: introduce is_dma_coherent

Message ID 1414245442-4306-3-git-send-email-stefano.stabellini@eu.citrix.com (mailing list archive)
State New, archived
Headers show

Commit Message

Stefano Stabellini Oct. 25, 2014, 1:57 p.m. UTC 
Introduce a simple utility function that returns whether a device is dma
coherent based on device tree information.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: catalin.marinas@arm.com
CC: Will.Deacon@arm.com
---
 arch/arm/xen/mm32.c |    6 ++++++
 1 file changed, 6 insertions(+)
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Patch

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,