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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-18 20:01:32 +0400 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2013-10-18 20:01:32 +0400 |
| commit | 58c8b26909f287c72a7a39d26f800ffe61e01bf3 (patch) | |
| tree | 50fa2afa660f42fdb10ecbd6195e46cb265a76b3 /arch/arm64/include/asm/dma-mapping.h | |
| parent | c7e9bc548325f19635e7ac7cd5f3ec587228952e (diff) | |
| download | linux-58c8b26909f287c72a7a39d26f800ffe61e01bf3.tar.xz | |
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.
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>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
CC: will.deacon@arm.com
Changes in v7:
- return xen_dma_ops only if we are the initial domain;
- rename __get_dma_ops to __generic_dma_ops.
Diffstat (limited to 'arch/arm64/include/asm/dma-mapping.h')
| -rw-r--r-- | 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 b/arch/arm64/include/asm/dma-mapping.h index 59206b178494..fd0c0c0e447a 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 ARCH_HAS_DMA_GET_REQUIRED_MASK #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 *dev) 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) |