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arm64: use swiotlb_alloc and swiotlb_free 

The generic swiotlb_alloc and swiotlb_free routines already take care
of CMA allocations and adding GFP_DMA32 where needed, so use them
instead of the arm specific helpers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2017-12-24 13:53:50 +01:00
parent ad67f5a654
commit 0d8488ac1b
2 changed files with 4 additions and 43 deletions
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1
arch/arm64/Kconfig
View File

@ -59,6 +59,7 @@ config ARM64
select COMMON_CLK
select CPU_PM if (SUSPEND || CPU_IDLE)
select DCACHE_WORD_ACCESS
select DMA_DIRECT_OPS
select EDAC_SUPPORT
select FRAME_POINTER
select GENERIC_ALLOCATOR

46
arch/arm64/mm/dma-mapping.c
View File

@ -91,46 +91,6 @@ static int __free_from_pool(void *start, size_t size)
return 1;
}
static void *__dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
unsigned long attrs)
{
if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
dev->coherent_dma_mask <= DMA_BIT_MASK(32))
flags |= GFP_DMA32;
if (dev_get_cma_area(dev) && gfpflags_allow_blocking(flags)) {
struct page *page;
void *addr;
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
get_order(size), flags);
if (!page)
return NULL;
*dma_handle = phys_to_dma(dev, page_to_phys(page));
addr = page_address(page);
memset(addr, 0, size);
return addr;
} else {
return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
}
}
static void __dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs)
{
bool freed;
phys_addr_t paddr = dma_to_phys(dev, dma_handle);
freed = dma_release_from_contiguous(dev,
phys_to_page(paddr),
size >> PAGE_SHIFT);
if (!freed)
swiotlb_free_coherent(dev, size, vaddr, dma_handle);
}
static void *__dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
unsigned long attrs)
@ -152,7 +112,7 @@ static void *__dma_alloc(struct device *dev, size_t size,
return addr;
}
ptr = __dma_alloc_coherent(dev, size, dma_handle, flags, attrs);
ptr = swiotlb_alloc(dev, size, dma_handle, flags, attrs);
if (!ptr)
goto no_mem;
@ -173,7 +133,7 @@ static void *__dma_alloc(struct device *dev, size_t size,
return coherent_ptr;
no_map:
__dma_free_coherent(dev, size, ptr, *dma_handle, attrs);
swiotlb_free(dev, size, ptr, *dma_handle, attrs);
no_mem:
return NULL;
}
@ -191,7 +151,7 @@ static void __dma_free(struct device *dev, size_t size,
return;
vunmap(vaddr);
}
__dma_free_coherent(dev, size, swiotlb_addr, dma_handle, attrs);
swiotlb_free(dev, size, swiotlb_addr, dma_handle, attrs);
}
static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,