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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2013-10-18 18:01:26 +0200
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2013-10-18 18:01:26 +0200
commitc7e9bc548325f19635e7ac7cd5f3ec587228952e (patch)
tree32bb5fe8a0eca9b0c110a29b1f95c23728644663
parentswiotlb-xen: introduce xen_swiotlb_set_dma_mask (diff)
downloadlinux-c7e9bc548325f19635e7ac7cd5f3ec587228952e.tar.xz
linux-c7e9bc548325f19635e7ac7cd5f3ec587228952e.zip
arm/xen: get_dma_ops: return xen_dma_ops if we are running as xen_initial_domain
We can't simply override arm_dma_ops with xen_dma_ops because devices are allowed to have their own dma_ops and they take precedence over arm_dma_ops. When running on Xen as initial domain, we always want xen_dma_ops to be the one in use. We introduce __generic_dma_ops to allow xen_dma_ops functions to call back to the native implementation. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> CC: will.deacon@arm.com CC: linux@arm.linux.org.uk Changes in v7: - return xen_dma_ops only if we are the initial domain; - rename __get_dma_ops to __generic_dma_ops.
-rw-r--r--arch/arm/include/asm/dma-mapping.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 01b5a3d92197..f5945d4e4e9f 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -12,17 +12,28 @@
#include <asm/memory.h>
#include <asm/cacheflush.h>
+#include <xen/xen.h>
+#include <asm/xen/hypervisor.h>
+
#define DMA_ERROR_CODE (~0)
extern struct dma_map_ops arm_dma_ops;
extern struct dma_map_ops arm_coherent_dma_ops;
-static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
{
if (dev && dev->archdata.dma_ops)
return dev->archdata.dma_ops;
return &arm_dma_ops;
}
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+ if (xen_initial_domain())
+ return xen_dma_ops;
+ else
+ return __generic_dma_ops(dev);
+}
+
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
{
BUG_ON(!dev);