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Date: Thu, 10 Sep 2020 13:57:48 +0100
From: Robin Murphy <robin.murphy@....com>
To: Christoph Hellwig <hch@....de>, Tony Luck <tony.luck@...el.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
iommu@...ts.linux-foundation.org
Cc: linux-ia64@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH 06/12] dma-direct: remove dma_direct_{alloc,free}_pages
On 2020-09-08 17:47, Christoph Hellwig wrote:
> Just merge these helpers into the main dma_direct_{alloc,free} routines,
> as the additional checks are always false for the two callers.
Reviewed-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> arch/x86/kernel/amd_gart_64.c | 6 +++---
> include/linux/dma-direct.h | 4 ----
> kernel/dma/direct.c | 39 ++++++++++++++---------------------
> kernel/dma/pool.c | 2 +-
> 4 files changed, 19 insertions(+), 32 deletions(-)
>
> diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
> index bccc5357bffd6c..153374b996a279 100644
> --- a/arch/x86/kernel/amd_gart_64.c
> +++ b/arch/x86/kernel/amd_gart_64.c
> @@ -467,7 +467,7 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
> {
> void *vaddr;
>
> - vaddr = dma_direct_alloc_pages(dev, size, dma_addr, flag, attrs);
> + vaddr = dma_direct_alloc(dev, size, dma_addr, flag, attrs);
> if (!vaddr ||
> !force_iommu || dev->coherent_dma_mask <= DMA_BIT_MASK(24))
> return vaddr;
> @@ -479,7 +479,7 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
> goto out_free;
> return vaddr;
> out_free:
> - dma_direct_free_pages(dev, size, vaddr, *dma_addr, attrs);
> + dma_direct_free(dev, size, vaddr, *dma_addr, attrs);
> return NULL;
> }
>
> @@ -489,7 +489,7 @@ gart_free_coherent(struct device *dev, size_t size, void *vaddr,
> dma_addr_t dma_addr, unsigned long attrs)
> {
> gart_unmap_page(dev, dma_addr, size, DMA_BIDIRECTIONAL, 0);
> - dma_direct_free_pages(dev, size, vaddr, dma_addr, attrs);
> + dma_direct_free(dev, size, vaddr, dma_addr, attrs);
> }
>
> static int no_agp;
> diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
> index 95e3e28bd93f47..20eceb2e4f91f8 100644
> --- a/include/linux/dma-direct.h
> +++ b/include/linux/dma-direct.h
> @@ -77,10 +77,6 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
> gfp_t gfp, unsigned long attrs);
> void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
> dma_addr_t dma_addr, unsigned long attrs);
> -void *dma_direct_alloc_pages(struct device *dev, size_t size,
> - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
> -void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
> - dma_addr_t dma_addr, unsigned long attrs);
> int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,
> void *cpu_addr, dma_addr_t dma_addr, size_t size,
> unsigned long attrs);
> diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
> index 949c1cbf08b2d5..1d564bea58571b 100644
> --- a/kernel/dma/direct.c
> +++ b/kernel/dma/direct.c
> @@ -151,13 +151,18 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
> return page;
> }
>
> -void *dma_direct_alloc_pages(struct device *dev, size_t size,
> +void *dma_direct_alloc(struct device *dev, size_t size,
> dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
> {
> struct page *page;
> void *ret;
> int err;
>
> + if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
> + !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
> + dma_alloc_need_uncached(dev, attrs))
> + return arch_dma_alloc(dev, size, dma_handle, gfp, attrs);
> +
> size = PAGE_ALIGN(size);
>
> if (dma_should_alloc_from_pool(dev, gfp, attrs)) {
> @@ -256,11 +261,18 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
> return NULL;
> }
>
> -void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
> - dma_addr_t dma_addr, unsigned long attrs)
> +void dma_direct_free(struct device *dev, size_t size,
> + void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs)
> {
> unsigned int page_order = get_order(size);
>
> + if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
> + !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
> + dma_alloc_need_uncached(dev, attrs)) {
> + arch_dma_free(dev, size, cpu_addr, dma_addr, attrs);
> + return;
> + }
> +
> /* If cpu_addr is not from an atomic pool, dma_free_from_pool() fails */
> if (dma_should_free_from_pool(dev, attrs) &&
> dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size)))
> @@ -284,27 +296,6 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
> dma_free_contiguous(dev, dma_direct_to_page(dev, dma_addr), size);
> }
>
> -void *dma_direct_alloc(struct device *dev, size_t size,
> - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
> -{
> - if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
> - !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
> - dma_alloc_need_uncached(dev, attrs))
> - return arch_dma_alloc(dev, size, dma_handle, gfp, attrs);
> - return dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
> -}
> -
> -void dma_direct_free(struct device *dev, size_t size,
> - void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs)
> -{
> - if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
> - !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
> - dma_alloc_need_uncached(dev, attrs))
> - arch_dma_free(dev, size, cpu_addr, dma_addr, attrs);
> - else
> - dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);
> -}
> -
> #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
> defined(CONFIG_SWIOTLB)
> void dma_direct_sync_sg_for_device(struct device *dev,
> diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> index 1281c0f0442bc5..fe11643ff9cc7b 100644
> --- a/kernel/dma/pool.c
> +++ b/kernel/dma/pool.c
> @@ -115,7 +115,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
> #endif
> /*
> * Memory in the atomic DMA pools must be unencrypted, the pools do not
> - * shrink so no re-encryption occurs in dma_direct_free_pages().
> + * shrink so no re-encryption occurs in dma_direct_free().
> */
> ret = set_memory_decrypted((unsigned long)page_to_virt(page),
> 1 << order);
>
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