Re: [Xen-devel] [PATCH 02/11] xen/arm: consolidate page-coherent.h

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Thu, 5 Sep 2019, Christoph Hellwig wrote:
> Shared the duplicate arm/arm64 code in include/xen/arm/page-coherent.h.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
>  arch/arm/include/asm/xen/page-coherent.h   | 75 --------------------
>  arch/arm64/include/asm/xen/page-coherent.h | 75 --------------------
>  include/xen/arm/page-coherent.h            | 80 ++++++++++++++++++++++
>  3 files changed, 80 insertions(+), 150 deletions(-)
> 
> diff --git a/arch/arm/include/asm/xen/page-coherent.h 
> b/arch/arm/include/asm/xen/page-coherent.h
> index 602ac02f154c..27e984977402 100644
> --- a/arch/arm/include/asm/xen/page-coherent.h
> +++ b/arch/arm/include/asm/xen/page-coherent.h
> @@ -1,77 +1,2 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H
> -#define _ASM_ARM_XEN_PAGE_COHERENT_H
> -
> -#include <linux/dma-mapping.h>
> -#include <asm/page.h>
>  #include <xen/arm/page-coherent.h>
> -
> -static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t 
> size,
> -             dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
> -{
> -     return dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
> -}
> -
> -static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
> -             void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
> -{
> -     dma_direct_free(hwdev, size, cpu_addr, dma_handle, 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)
> -{
> -     unsigned long pfn = PFN_DOWN(handle);
> -
> -     if (pfn_valid(pfn))
> -             dma_direct_sync_single_for_cpu(hwdev, handle, size, dir);
> -     else
> -             __xen_dma_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)
> -{
> -     unsigned long pfn = PFN_DOWN(handle);
> -     if (pfn_valid(pfn))
> -             dma_direct_sync_single_for_device(hwdev, handle, size, dir);
> -     else
> -             __xen_dma_sync_single_for_device(hwdev, handle, size, dir);
> -}
> -
> -static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
> -          dma_addr_t dev_addr, unsigned long offset, size_t size,
> -          enum dma_data_direction dir, unsigned long attrs)
> -{
> -     unsigned long page_pfn = page_to_xen_pfn(page);
> -     unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
> -     unsigned long compound_pages =
> -             (1<<compound_order(page)) * XEN_PFN_PER_PAGE;
> -     bool local = (page_pfn <= dev_pfn) &&
> -             (dev_pfn - page_pfn < compound_pages);
> -
> -     if (local)
> -             dma_direct_map_page(hwdev, page, offset, size, dir, attrs);
> -     else
> -             __xen_dma_map_page(hwdev, page, dev_addr, 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, unsigned long attrs)
> -{
> -     unsigned long pfn = PFN_DOWN(handle);
> -     /*
> -      * Dom0 is mapped 1:1, while the Linux page can be spanned accross
> -      * multiple Xen page, it's not possible to have a mix of local and
> -      * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
> -      * foreign mfn will always return false. If the page is local we can
> -      * safely call the native dma_ops function, otherwise we call the xen
> -      * specific function.
> -      */
> -     if (pfn_valid(pfn))
> -             dma_direct_unmap_page(hwdev, handle, size, dir, attrs);
> -     else
> -             __xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
> -}
> -
> -#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 d88e56b90b93..27e984977402 100644
> --- a/arch/arm64/include/asm/xen/page-coherent.h
> +++ b/arch/arm64/include/asm/xen/page-coherent.h
> @@ -1,77 +1,2 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef _ASM_ARM64_XEN_PAGE_COHERENT_H
> -#define _ASM_ARM64_XEN_PAGE_COHERENT_H
> -
> -#include <linux/dma-mapping.h>
> -#include <asm/page.h>
>  #include <xen/arm/page-coherent.h>
> -
> -static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t 
> size,
> -             dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
> -{
> -     return dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
> -}
> -
> -static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
> -             void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
> -{
> -     dma_direct_free(hwdev, size, cpu_addr, dma_handle, 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)
> -{
> -     unsigned long pfn = PFN_DOWN(handle);
> -
> -     if (pfn_valid(pfn))
> -             dma_direct_sync_single_for_cpu(hwdev, handle, size, dir);
> -     else
> -             __xen_dma_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)
> -{
> -     unsigned long pfn = PFN_DOWN(handle);
> -     if (pfn_valid(pfn))
> -             dma_direct_sync_single_for_device(hwdev, handle, size, dir);
> -     else
> -             __xen_dma_sync_single_for_device(hwdev, handle, size, dir);
> -}
> -
> -static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
> -          dma_addr_t dev_addr, unsigned long offset, size_t size,
> -          enum dma_data_direction dir, unsigned long attrs)
> -{
> -     unsigned long page_pfn = page_to_xen_pfn(page);
> -     unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
> -     unsigned long compound_pages =
> -             (1<<compound_order(page)) * XEN_PFN_PER_PAGE;
> -     bool local = (page_pfn <= dev_pfn) &&
> -             (dev_pfn - page_pfn < compound_pages);
> -
> -     if (local)
> -             dma_direct_map_page(hwdev, page, offset, size, dir, attrs);
> -     else
> -             __xen_dma_map_page(hwdev, page, dev_addr, 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, unsigned long attrs)
> -{
> -     unsigned long pfn = PFN_DOWN(handle);
> -     /*
> -      * Dom0 is mapped 1:1, while the Linux page can be spanned accross
> -      * multiple Xen page, it's not possible to have a mix of local and
> -      * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
> -      * foreign mfn will always return false. If the page is local we can
> -      * safely call the native dma_ops function, otherwise we call the xen
> -      * specific function.
> -      */
> -     if (pfn_valid(pfn))
> -             dma_direct_unmap_page(hwdev, handle, size, dir, attrs);
> -     else
> -             __xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
> -}
> -
> -#endif /* _ASM_ARM64_XEN_PAGE_COHERENT_H */
> diff --git a/include/xen/arm/page-coherent.h b/include/xen/arm/page-coherent.h
> index 2ca9164a79bf..a840d6949a87 100644
> --- a/include/xen/arm/page-coherent.h
> +++ b/include/xen/arm/page-coherent.h
> @@ -2,6 +2,9 @@
>  #ifndef _XEN_ARM_PAGE_COHERENT_H
>  #define _XEN_ARM_PAGE_COHERENT_H
>  
> +#include <linux/dma-mapping.h>
> +#include <asm/page.h>
> +
>  void __xen_dma_map_page(struct device *hwdev, struct page *page,
>            dma_addr_t dev_addr, unsigned long offset, size_t size,
>            enum dma_data_direction dir, unsigned long attrs);
> @@ -13,4 +16,81 @@ void __xen_dma_sync_single_for_cpu(struct device *hwdev,
>  void __xen_dma_sync_single_for_device(struct device *hwdev,
>               dma_addr_t handle, size_t size, enum dma_data_direction dir);
>  
> +static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t 
> size,
> +             dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
> +{
> +     return dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
> +}
> +
> +static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
> +             void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
> +{
> +     dma_direct_free(hwdev, size, cpu_addr, dma_handle, 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)
> +{
> +     unsigned long pfn = PFN_DOWN(handle);
> +
> +     if (pfn_valid(pfn))
> +             dma_direct_sync_single_for_cpu(hwdev, handle, size, dir);
> +     else
> +             __xen_dma_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)
> +{
> +     unsigned long pfn = PFN_DOWN(handle);
> +     if (pfn_valid(pfn))
> +             dma_direct_sync_single_for_device(hwdev, handle, size, dir);
> +     else
> +             __xen_dma_sync_single_for_device(hwdev, handle, size, dir);
> +}
> +
> +static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
> +          dma_addr_t dev_addr, unsigned long offset, size_t size,
> +          enum dma_data_direction dir, unsigned long attrs)
> +{
> +     unsigned long page_pfn = page_to_xen_pfn(page);
> +     unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
> +     unsigned long compound_pages =
> +             (1<<compound_order(page)) * XEN_PFN_PER_PAGE;
> +     bool local = (page_pfn <= dev_pfn) &&
> +             (dev_pfn - page_pfn < compound_pages);
> +
> +     /*
> +      * Dom0 is mapped 1:1, while the Linux page can span across
> +      * multiple Xen pages, it's not possible for it to contain a
> +      * mix of local and foreign Xen pages. So if the first xen_pfn
> +      * == mfn the page is local otherwise it's a foreign page
> +      * grant-mapped in dom0. If the page is local we can safely
> +      * call the native dma_ops function, otherwise we call the xen
> +      * specific function.
> +      */
> +     if (local)
> +             dma_direct_map_page(hwdev, page, offset, size, dir, attrs);
> +     else
> +             __xen_dma_map_page(hwdev, page, dev_addr, 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, unsigned long attrs)
> +{
> +     unsigned long pfn = PFN_DOWN(handle);
> +     /*
> +      * Dom0 is mapped 1:1, while the Linux page can be spanned accross
> +      * multiple Xen page, it's not possible to have a mix of local and
> +      * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
> +      * foreign mfn will always return false. If the page is local we can
> +      * safely call the native dma_ops function, otherwise we call the xen
> +      * specific function.
> +      */
> +     if (pfn_valid(pfn))
> +             dma_direct_unmap_page(hwdev, handle, size, dir, attrs);
> +     else
> +             __xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
> +}
> +
>  #endif /* _XEN_ARM_PAGE_COHERENT_H */
> -- 
> 2.20.1
> 

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