[PATCH 02/31] scatterlist: use sg_phys()

Christoph Hellwig
2015-08-12T07:05:21Z

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

@@
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) & PAGE_MASK

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/arm/mm/dma-mapping.c | 2 +-
arch/microblaze/kernel/dma.c | 3 +--
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(+), 8 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index cba12f3..3d3d6aa 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) & PAGE_MASK;
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..c89da63 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -61,8 +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,
- sg->length, direction);
+ __dma_sync(sg_phys(sg), sg->length, direction);
}

return nents;
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0649b94..3541d65 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2097,7 +2097,7 @@ 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) & PAGE_MASK) | prot;
phys_pfn = pteval >> VTD_PAGE_SHIFT;
}

@@ -3623,7 +3623,7 @@ 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..f7b6ef9 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) & PAGE_MASK,
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) & PAGE_MASK,
sg->length);
}
chunk_heap->allocated -= allocated_size;
--
1.9.1