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Groups > linux.kernel > #1202859 > unrolled thread

[PATCH 6/6] scatterlist: use sg_phys()

Started byChristoph Hellwig <hch@lst.de>
First post2015-08-07 18:20 +0200
Last post2015-08-08 15:30 +0200
Articles 3 — 3 participants

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  [PATCH 6/6] scatterlist: use sg_phys() Christoph Hellwig <hch@lst.de> - 2015-08-07 18:20 +0200
    Re: [PATCH 6/6] scatterlist: use sg_phys() Dan Williams <dan.j.williams@intel.com> - 2015-08-08 03:20 +0200
    Re: [PATCH 6/6] scatterlist: use sg_phys() "Williams, Dan J" <dan.j.williams@intel.com> - 2015-08-08 15:30 +0200

#1202859 — [PATCH 6/6] scatterlist: use sg_phys()

FromChristoph Hellwig <hch@lst.de>
Date2015-08-07 18:20 +0200
Subject[PATCH 6/6] scatterlist: use sg_phys()
Message-ID<pUSxb-4FO-3@gated-at.bofh.it>
From: Dan Williams <dan.j.williams@intel.com>

Coccinelle cleanup to replace open coded sg to physical address
translations.  This is in preparation for introducing scatterlists that
reference __pfn_t.

// 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

@@
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 cba12f3..58774b9 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1520,7 +1520,7 @@ 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 bf4dec2..9c8e8f4 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 5852df8..e0faecc 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2098,7 +2098,7 @@ 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;
 		}
 
@@ -3625,7 +3625,7 @@ 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 f286090..049df49 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1408,7 +1408,7 @@ 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 5474615..c422006 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;
-- 
1.9.1

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#1203136

FromDan Williams <dan.j.williams@intel.com>
Date2015-08-08 03:20 +0200
Message-ID<pV0XM-qY-1@gated-at.bofh.it>
In reply to#1202859
On Fri, Aug 7, 2015 at 9:15 AM, Christoph Hellwig <hch@lst.de> wrote:
> From: Dan Williams <dan.j.williams@intel.com>
>
> Coccinelle cleanup to replace open coded sg to physical address
> translations.  This is in preparation for introducing scatterlists that
> reference __pfn_t.
>
> // 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
>
> @@
> 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

So this ends up being an awkward conversion, a better one is:

- page_to_phys(sg_page(sg))
+ sg_phys(sg) & PAGE_MASK

[..]
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 5852df8..e0faecc 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -2098,7 +2098,7 @@ 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;

For example here, as Joerg pointed out.

[1]: https://lkml.org/lkml/2015/6/10/230
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#1203268

From"Williams, Dan J" <dan.j.williams@intel.com>
Date2015-08-08 15:30 +0200
Message-ID<pVcmd-8q1-5@gated-at.bofh.it>
In reply to#1202859
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