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[Xen-devel] [PATCH v8 09/19] arm64/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.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
CC: will.deacon@xxxxxxx

Changes in v7:
- return xen_dma_ops only if we are the initial domain;
- rename __get_dma_ops to __generic_dma_ops.
 arch/arm64/include/asm/dma-mapping.h |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/arch/arm64/include/asm/dma-mapping.h 
index 59206b1..fd0c0c0 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -23,12 +23,15 @@
 #include <asm-generic/dma-coherent.h>
+#include <xen/xen.h>
+#include <asm/xen/hypervisor.h>
 #define DMA_ERROR_CODE (~(dma_addr_t)0)
 extern struct dma_map_ops *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 (unlikely(!dev) || !dev->archdata.dma_ops)
                return dma_ops;
@@ -36,6 +39,14 @@ static inline struct dma_map_ops *get_dma_ops(struct device 
                return dev->archdata.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);
 #include <asm-generic/dma-mapping-common.h>
 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)

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