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    Subject[PATCH v9 12/18] xen: introduce xen_dma_map/unmap_page and xen_dma_sync_single_for_cpu/device
    Date
    Introduce xen_dma_map_page, xen_dma_unmap_page,
    xen_dma_sync_single_for_cpu and xen_dma_sync_single_for_device.
    They have empty implementations on x86 and ia64 but they call the
    corresponding platform dma_ops function on arm and arm64.

    Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

    Changes in v9:
    - xen_dma_map_page return void, avoid page_to_phys.
    ---
    arch/arm/include/asm/xen/page-coherent.h | 28 ++++++++++++++++++++++++++++
    arch/arm64/include/asm/xen/page-coherent.h | 25 +++++++++++++++++++++++++
    arch/ia64/include/asm/xen/page-coherent.h | 14 ++++++++++++++
    arch/x86/include/asm/xen/page-coherent.h | 14 ++++++++++++++
    4 files changed, 81 insertions(+), 0 deletions(-)

    diff --git a/arch/arm/include/asm/xen/page-coherent.h b/arch/arm/include/asm/xen/page-coherent.h
    index c4d843c..1109017 100644
    --- a/arch/arm/include/asm/xen/page-coherent.h
    +++ b/arch/arm/include/asm/xen/page-coherent.h
    @@ -19,4 +19,32 @@ static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
    __generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
    }

    +static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
    + unsigned long offset, size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs)
    +{
    + __generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
    +}
    +
    +static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
    + size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs)
    +{
    + if (__generic_dma_ops(hwdev)->unmap_page)
    + __generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
    +}
    +
    +static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir)
    +{
    + if (__generic_dma_ops(hwdev)->sync_single_for_cpu)
    + __generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
    +}
    +
    +static inline void xen_dma_sync_single_for_device(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir)
    +{
    + if (__generic_dma_ops(hwdev)->sync_single_for_device)
    + __generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
    +}
    #endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */
    diff --git a/arch/arm64/include/asm/xen/page-coherent.h b/arch/arm64/include/asm/xen/page-coherent.h
    index 3b4f029..2820f1a 100644
    --- a/arch/arm64/include/asm/xen/page-coherent.h
    +++ b/arch/arm64/include/asm/xen/page-coherent.h
    @@ -19,4 +19,29 @@ static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
    __generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
    }

    +static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
    + unsigned long offset, size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs)
    +{
    + __generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
    +}
    +
    +static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
    + size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs)
    +{
    + __generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
    +}
    +
    +static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir)
    +{
    + __generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
    +}
    +
    +static inline void xen_dma_sync_single_for_device(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir)
    +{
    + __generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
    +}
    #endif /* _ASM_ARM64_XEN_PAGE_COHERENT_H */
    diff --git a/arch/ia64/include/asm/xen/page-coherent.h b/arch/ia64/include/asm/xen/page-coherent.h
    index 37b929c..96e42f9 100644
    --- a/arch/ia64/include/asm/xen/page-coherent.h
    +++ b/arch/ia64/include/asm/xen/page-coherent.h
    @@ -21,4 +21,18 @@ static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
    free_pages((unsigned long) cpu_addr, get_order(size));
    }

    +static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
    + unsigned long offset, size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs) { }
    +
    +static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
    + size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs) { }
    +
    +static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
    +
    +static inline void xen_dma_sync_single_for_device(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
    +
    #endif /* _ASM_IA64_XEN_PAGE_COHERENT_H */
    diff --git a/arch/x86/include/asm/xen/page-coherent.h b/arch/x86/include/asm/xen/page-coherent.h
    index 31de2e0..7f02fe4 100644
    --- a/arch/x86/include/asm/xen/page-coherent.h
    +++ b/arch/x86/include/asm/xen/page-coherent.h
    @@ -21,4 +21,18 @@ static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
    free_pages((unsigned long) cpu_addr, get_order(size));
    }

    +static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
    + unsigned long offset, size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs) { }
    +
    +static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
    + size_t size, enum dma_data_direction dir,
    + struct dma_attrs *attrs) { }
    +
    +static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
    +
    +static inline void xen_dma_sync_single_for_device(struct device *hwdev,
    + dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
    +
    #endif /* _ASM_X86_XEN_PAGE_COHERENT_H */
    --
    1.7.2.5


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