From 55ea54441fb3b6532d5d32417911ff5a10750903 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 4 Jan 2019 10:42:49 +0100 Subject: videobuf2: replace a layering violation with dma_map_resource vb2_dc_get_userptr pokes into arm direct mapping details to get the resemblance of a dma address for a a physical address that does is not backed by a page struct. Not only is this not portable to other architectures with dma direct mapping offsets, but also not to uses of IOMMUs of any kind. Switch to the proper dma_map_resource / dma_unmap_resource interface instead. Signed-off-by: Christoph Hellwig Acked-by: Mauro Carvalho Chehab Tested-by: Marek Szyprowski --- .../media/common/videobuf2/videobuf2-dma-contig.c | 41 +++++----------------- 1 file changed, 9 insertions(+), 32 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c index aff0ab7bf83d..82389aead6ed 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c @@ -439,42 +439,14 @@ static void vb2_dc_put_userptr(void *buf_priv) set_page_dirty_lock(pages[i]); sg_free_table(sgt); kfree(sgt); + } else { + dma_unmap_resource(buf->dev, buf->dma_addr, buf->size, + buf->dma_dir, 0); } vb2_destroy_framevec(buf->vec); kfree(buf); } -/* - * For some kind of reserved memory there might be no struct page available, - * so all that can be done to support such 'pages' is to try to convert - * pfn to dma address or at the last resort just assume that - * dma address == physical address (like it has been assumed in earlier version - * of videobuf2-dma-contig - */ - -#ifdef __arch_pfn_to_dma -static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) -{ - return (dma_addr_t)__arch_pfn_to_dma(dev, pfn); -} -#elif defined(__pfn_to_bus) -static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) -{ - return (dma_addr_t)__pfn_to_bus(pfn); -} -#elif defined(__pfn_to_phys) -static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) -{ - return (dma_addr_t)__pfn_to_phys(pfn); -} -#else -static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) -{ - /* really, we cannot do anything better at this point */ - return (dma_addr_t)(pfn) << PAGE_SHIFT; -} -#endif - static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr, unsigned long size, enum dma_data_direction dma_dir) { @@ -528,7 +500,12 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr, for (i = 1; i < n_pages; i++) if (nums[i-1] + 1 != nums[i]) goto fail_pfnvec; - buf->dma_addr = vb2_dc_pfn_to_dma(buf->dev, nums[0]); + buf->dma_addr = dma_map_resource(buf->dev, + __pfn_to_phys(nums[0]), size, buf->dma_dir, 0); + if (dma_mapping_error(buf->dev, buf->dma_addr)) { + ret = -ENOMEM; + goto fail_pfnvec; + } goto out; } -- cgit From 82c5de0ab8dbd6035223ad69e76bd8a88a0a9399 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 25 Dec 2018 13:29:54 +0100 Subject: dma-mapping: remove the DMA_MEMORY_EXCLUSIVE flag All users of dma_declare_coherent want their allocations to be exclusive, so default to exclusive allocations. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman --- drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c b/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c index 6803f744e307..cc357b8db1dc 100644 --- a/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c +++ b/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c @@ -1708,8 +1708,7 @@ static int sh_mobile_ceu_probe(struct platform_device *pdev) if (res) { err = dma_declare_coherent_memory(&pdev->dev, res->start, res->start, - resource_size(res), - DMA_MEMORY_EXCLUSIVE); + resource_size(res)); if (err) { dev_err(&pdev->dev, "Unable to declare CEU memory.\n"); return err; -- cgit