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arm64: Support DMA_ATTR_WRITE_COMBINE

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DMA_ATTR_WRITE_COMBINE is currently ignored. Set the pgprot
appropriately for non coherent opperations.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Laura Abbott 2014-03-14 19:52:24 +00:00 committed by Catalin Marinas
parent 6e8d7968e9
commit 214fdbe74a
1 changed files with 12 additions and 2 deletions
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14
arch/arm64/mm/dma-mapping.c
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@ -30,6 +30,16 @@
struct dma_map_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);
static pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot,
bool coherent)
{
if (dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs))
return pgprot_writecombine(prot);
else if (!coherent)
return pgprot_dmacoherent(prot);
return prot;
}
static void *__dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
struct dma_attrs *attrs)
@ -104,7 +114,7 @@ static void *__dma_alloc_noncoherent(struct device *dev, size_t size,
for (i = 0; i < (size >> PAGE_SHIFT); i++)
map[i] = page + i;
coherent_ptr = vmap(map, size >> PAGE_SHIFT, VM_MAP,
pgprot_dmacoherent(pgprot_default));
__get_dma_pgprot(attrs, pgprot_default, false));
kfree(map);
if (!coherent_ptr)
goto no_map;
@ -250,7 +260,7 @@ static int __swiotlb_mmap_noncoherent(struct device *dev,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
struct dma_attrs *attrs)
{
vma->vm_page_prot = pgprot_dmacoherent(vma->vm_page_prot);
vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot, false);
return __dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}