linux-kernel - Re: [PATCH v3 05/11] scatterlist: use sg

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Date:	Tue, 12 May 2015 07:24:57 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Dan Williams <dan.j.williams@...el.com>
cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	axboe@...nel.dk, riel@...hat.com, linux-nvdimm@...1.01.org,
	david@...morbit.com, hch@....de, mgorman@...e.de,
	j.glisse@...il.com, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, mingo@...nel.org
Subject: Re: [PATCH v3 05/11] scatterlist: use sg_phys()



On Tue, 12 May 2015, Dan Williams wrote:

> Coccinelle cleanup to replace open coded sg to physical address
> translations.  This is in preparation for introducing scatterlists that
> reference pfn(s) without a backing struct page.
> 
> // sg_phys.cocci: convert usage page_to_phys(sg_page(sg)) to sg_phys(sg)
> // usage: make coccicheck COCCI=sg_phys.cocci MODE=patch
> 
> virtual patch
> virtual report
> virtual org

Just for information, you don't need the three lines above.  There are ony 
useful when you want the semantic patch to support several kinds of 
output.

julia

> @@
> struct scatterlist *sg;
> @@
> 
> - page_to_phys(sg_page(sg)) + sg->offset
> + sg_phys(sg)
> 
> @@
> struct scatterlist *sg;
> @@
> 
> - page_to_phys(sg_page(sg))
> + sg_phys(sg) - sg->offset
> 
> Cc: Julia Lawall <Julia.Lawall@...6.fr>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  arch/arm/mm/dma-mapping.c                    |    2 +-
>  arch/microblaze/kernel/dma.c                 |    2 +-
>  drivers/iommu/intel-iommu.c                  |    4 ++--
>  drivers/iommu/iommu.c                        |    2 +-
>  drivers/staging/android/ion/ion_chunk_heap.c |    4 ++--
>  5 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 09c5fe3d30c2..43cc6a8fdacc 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -1502,7 +1502,7 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
>  		return -ENOMEM;
>  
>  	for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
> -		phys_addr_t phys = page_to_phys(sg_page(s));
> +		phys_addr_t phys = sg_phys(s) - s->offset;
>  		unsigned int len = PAGE_ALIGN(s->offset + s->length);
>  
>  		if (!is_coherent &&
> diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
> index ed7ba8a11822..dcb3c594d626 100644
> --- a/arch/microblaze/kernel/dma.c
> +++ b/arch/microblaze/kernel/dma.c
> @@ -61,7 +61,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
>  	/* FIXME this part of code is untested */
>  	for_each_sg(sgl, sg, nents, i) {
>  		sg->dma_address = sg_phys(sg);
> -		__dma_sync(page_to_phys(sg_page(sg)) + sg->offset,
> +		__dma_sync(sg_phys(sg),
>  							sg->length, direction);
>  	}
>  
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 68d43beccb7e..9b9ada71e0d3 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -1998,7 +1998,7 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
>  			sg_res = aligned_nrpages(sg->offset, sg->length);
>  			sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
>  			sg->dma_length = sg->length;
> -			pteval = page_to_phys(sg_page(sg)) | prot;
> +			pteval = (sg_phys(sg) - sg->offset) | prot;
>  			phys_pfn = pteval >> VTD_PAGE_SHIFT;
>  		}
>  
> @@ -3302,7 +3302,7 @@ static int intel_nontranslate_map_sg(struct device *hddev,
>  
>  	for_each_sg(sglist, sg, nelems, i) {
>  		BUG_ON(!sg_page(sg));
> -		sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
> +		sg->dma_address = sg_phys(sg);
>  		sg->dma_length = sg->length;
>  	}
>  	return nelems;
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index d4f527e56679..59808fc9110d 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1147,7 +1147,7 @@ size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
>  	min_pagesz = 1 << __ffs(domain->ops->pgsize_bitmap);
>  
>  	for_each_sg(sg, s, nents, i) {
> -		phys_addr_t phys = page_to_phys(sg_page(s)) + s->offset;
> +		phys_addr_t phys = sg_phys(s);
>  
>  		/*
>  		 * We are mapping on IOMMU page boundaries, so offset within
> diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c
> index 3e6ec2ee6802..b7da5d142aa9 100644
> --- a/drivers/staging/android/ion/ion_chunk_heap.c
> +++ b/drivers/staging/android/ion/ion_chunk_heap.c
> @@ -81,7 +81,7 @@ static int ion_chunk_heap_allocate(struct ion_heap *heap,
>  err:
>  	sg = table->sgl;
>  	for (i -= 1; i >= 0; i--) {
> -		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
> +		gen_pool_free(chunk_heap->pool, sg_phys(sg) - sg->offset,
>  			      sg->length);
>  		sg = sg_next(sg);
>  	}
> @@ -109,7 +109,7 @@ static void ion_chunk_heap_free(struct ion_buffer *buffer)
>  							DMA_BIDIRECTIONAL);
>  
>  	for_each_sg(table->sgl, sg, table->nents, i) {
> -		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
> +		gen_pool_free(chunk_heap->pool, sg_phys(sg) - sg->offset,
>  			      sg->length);
>  	}
>  	chunk_heap->allocated -= allocated_size;
> 
> 
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