From: Julia Lawall <julia.lawall@lip6.fr>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
axboe@kernel.dk, riel@redhat.com, linux-nvdimm@ml01.01.org,
david@fromorbit.com, hch@lst.de, mgorman@suse.de,
j.glisse@gmail.com, linux-fsdevel@vger.kernel.org,
akpm@linux-foundation.org, mingo@kernel.org
Subject: Re: [PATCH v3 05/11] scatterlist: use sg_phys()
Date: Tue, 12 May 2015 07:24:57 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.02.1505120724230.2075@localhost6.localdomain6> (raw)
In-Reply-To: <20150512042956.11521.32457.stgit@dwillia2-desk3.amr.corp.intel.com>
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@lip6.fr>
> Signed-off-by: Dan Williams <dan.j.williams@intel.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;
>
>
next prev parent reply other threads:[~2015-05-12 5:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-12 4:29 [PATCH v3 00/11] evacuate struct page from the block layer, introduce __pfn_t Dan Williams
2015-05-12 4:29 ` [PATCH v3 01/11] arch: introduce __pfn_t for persistenti/device memory Dan Williams
2015-05-12 4:29 ` [PATCH v3 02/11] block: add helpers for accessing a bio_vec page Dan Williams
2015-05-12 4:29 ` [PATCH v3 03/11] block: convert .bv_page to .bv_pfn bio_vec Dan Williams
2015-05-12 4:29 ` [PATCH v3 04/11] dma-mapping: allow archs to optionally specify a ->map_pfn() operation Dan Williams
2015-05-12 4:29 ` [PATCH v3 05/11] scatterlist: use sg_phys() Dan Williams
2015-05-12 5:24 ` Julia Lawall [this message]
2015-05-12 5:44 ` Dan Williams
2015-05-12 4:30 ` [PATCH v3 06/11] scatterlist: support "page-less" (__pfn_t only) entries Dan Williams
2015-05-13 18:35 ` Williams, Dan J
2015-05-19 4:10 ` Vinod Koul
2015-05-20 16:03 ` Dan Williams
2015-05-23 14:12 ` hch
2015-05-23 16:41 ` Dan Williams
2015-05-12 4:30 ` [PATCH v3 07/11] x86: support dma_map_pfn() Dan Williams
2015-05-12 4:30 ` [PATCH v3 08/11] x86: support kmap_atomic_pfn_t() for persistent memory Dan Williams
2015-05-12 4:30 ` [PATCH v3 09/11] block: convert kmap helpers to kmap_atomic_pfn_t() Dan Williams
2015-05-12 4:30 ` [PATCH v3 10/11] dax: convert to __pfn_t Dan Williams
2015-05-12 4:30 ` [PATCH v3 11/11] block: base support for pfn i/o Dan Williams
2015-05-23 14:32 ` [PATCH v3 00/11] evacuate struct page from the block layer, introduce __pfn_t Christoph Hellwig
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