On Mon, Nov 10, 2014 at 04:14:02PM +0000, Stefano Stabellini wrote:
> --- a/arch/arm/include/asm/xen/page.h
> +++ b/arch/arm/include/asm/xen/page.h
> @@ -107,4 +107,8 @@ static inline bool set_phys_to_machine(unsigned long pfn,
> unsigned long mfn)
> #define xen_remap(cookie, size) ioremap_cache((cookie), (size))
> #define xen_unmap(cookie) iounmap((cookie))
>
> +bool xen_arch_need_swiotlb(struct device *dev,
> + unsigned long pfn,
> + unsigned long mfn);
> +
> #endif /* _ASM_ARM_XEN_PAGE_H */
> diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
> index 0e96023..1b087cd 100644
> --- a/arch/arm/xen/mm.c
> +++ b/arch/arm/xen/mm.c
> @@ -102,6 +102,13 @@ void __xen_dma_sync_single_for_device(struct device
> *hwdev,
> __xen_dma_page_cpu_to_dev(hwdev, handle, size, dir);
> }
>
> +bool xen_arch_need_swiotlb(struct device *dev,
> + unsigned long pfn,
> + unsigned long mfn)
> +{
> + return ((pfn != mfn) && !is_device_dma_coherent(dev));
> +}
Why not a static inline? It doesn't look like a big function.
--
Catalin
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