dma-direct: add support for CMA allocation
Try the CMA allocator for coherent allocations if supported. Roughly modelled after the x86 code. Signed-off-by: Christoph Hellwig <hch@lst.de>
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2797596992
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080321d3b3
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@ -7,6 +7,7 @@
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-direct.h>
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#include <linux/scatterlist.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-contiguous.h>
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#include <linux/pfn.h>
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#include <linux/pfn.h>
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#define DIRECT_MAPPING_ERROR 0
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#define DIRECT_MAPPING_ERROR 0
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@ -29,19 +30,30 @@ check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
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static void *dma_direct_alloc(struct device *dev, size_t size,
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static void *dma_direct_alloc(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
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{
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{
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void *ret;
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unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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int page_order = get_order(size);
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struct page *page = NULL;
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ret = (void *)__get_free_pages(gfp, get_order(size));
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/* CMA can be used only in the context which permits sleeping */
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if (ret)
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if (gfpflags_allow_blocking(gfp))
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*dma_handle = phys_to_dma(dev, virt_to_phys(ret));
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page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
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if (!page)
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page = alloc_pages(gfp, page_order);
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if (!page)
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return NULL;
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return ret;
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*dma_handle = phys_to_dma(dev, page_to_phys(page));
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memset(page_address(page), 0, size);
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return page_address(page);
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}
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}
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static void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
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static void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_addr, unsigned long attrs)
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dma_addr_t dma_addr, unsigned long attrs)
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{
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{
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free_pages((unsigned long)cpu_addr, get_order(size));
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unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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if (!dma_release_from_contiguous(dev, virt_to_page(cpu_addr), count))
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free_pages((unsigned long)cpu_addr, get_order(size));
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}
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}
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static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
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static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
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