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SubjectRe: [PATCH 05/21] dma-iommu: remove the flush_page callback
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On 27/03/2019 08:04, Christoph Hellwig wrote:
> We now have a arch_dma_prep_coherent architecture hook that is used
> for the generic DMA remap allocator, and we should use the same
> interface for the dma-iommu code.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> arch/arm64/mm/dma-mapping.c | 8 +-------
> drivers/iommu/dma-iommu.c | 8 +++-----
> include/linux/dma-iommu.h | 3 +--
> 3 files changed, 5 insertions(+), 14 deletions(-)
>
> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> index e54288921e72..54787a3d4ad9 100644
> --- a/arch/arm64/mm/dma-mapping.c
> +++ b/arch/arm64/mm/dma-mapping.c
> @@ -94,12 +94,6 @@ arch_initcall(arm64_dma_init);
> #include <linux/platform_device.h>
> #include <linux/amba/bus.h>
>
> -/* Thankfully, all cache ops are by VA so we can ignore phys here */
> -static void flush_page(struct device *dev, const void *virt, phys_addr_t phys)
> -{
> - __dma_flush_area(virt, PAGE_SIZE);
> -}
> -
> static void *__iommu_alloc_attrs(struct device *dev, size_t size,
> dma_addr_t *handle, gfp_t gfp,
> unsigned long attrs)
> @@ -176,7 +170,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
> struct page **pages;
>
> pages = iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot,
> - handle, flush_page);
> + handle);
> if (!pages)
> return NULL;
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index 77aabe637a60..77d704c8f565 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -22,6 +22,7 @@
> #include <linux/acpi_iort.h>
> #include <linux/device.h>
> #include <linux/dma-iommu.h>
> +#include <linux/dma-noncoherent.h>
> #include <linux/gfp.h>
> #include <linux/huge_mm.h>
> #include <linux/iommu.h>
> @@ -531,8 +532,6 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
> * @attrs: DMA attributes for this allocation
> * @prot: IOMMU mapping flags
> * @handle: Out argument for allocated DMA handle
> - * @flush_page: Arch callback which must ensure PAGE_SIZE bytes from the
> - * given VA/PA are visible to the given non-coherent device.
> *
> * If @size is less than PAGE_SIZE, then a full CPU page will be allocated,
> * but an IOMMU which supports smaller pages might not map the whole thing.
> @@ -541,8 +540,7 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
> * or NULL on failure.
> */
> struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
> - unsigned long attrs, int prot, dma_addr_t *handle,
> - void (*flush_page)(struct device *, const void *, phys_addr_t))
> + unsigned long attrs, int prot, dma_addr_t *handle)
> {
> struct iommu_domain *domain = iommu_get_dma_domain(dev);
> struct iommu_dma_cookie *cookie = domain->iova_cookie;
> @@ -586,7 +584,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
> */
> sg_miter_start(&miter, sgt.sgl, sgt.orig_nents, SG_MITER_FROM_SG);
> while (sg_miter_next(&miter))
> - flush_page(dev, miter.addr, page_to_phys(miter.page));
> + arch_dma_prep_coherent(miter.page, PAGE_SIZE);
> sg_miter_stop(&miter);
> }
>
> diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
> index 3e206f4ee173..10ef708a605c 100644
> --- a/include/linux/dma-iommu.h
> +++ b/include/linux/dma-iommu.h
> @@ -45,8 +45,7 @@ int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
> * the arch code to take care of attributes and cache maintenance
> */
> struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
> - unsigned long attrs, int prot, dma_addr_t *handle,
> - void (*flush_page)(struct device *, const void *, phys_addr_t));
> + unsigned long attrs, int prot, dma_addr_t *handle);
> void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
> dma_addr_t *handle);
>
>

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