xtensa: support DMA buffers in high memory
If a DMA buffer is allocated in high memory and kernel mapping is required use dma_common_contiguous_remap to map buffer to the vmalloc region and dma_common_free_remap to unmap it. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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@ -16,6 +16,7 @@
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*/
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#include <linux/dma-contiguous.h>
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#include <linux/dma-direct.h>
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#include <linux/gfp.h>
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#include <linux/highmem.h>
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#include <linux/mm.h>
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@ -123,7 +124,7 @@ static void *xtensa_dma_alloc(struct device *dev, size_t size,
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unsigned long attrs)
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{
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unsigned long ret;
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unsigned long uncached = 0;
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unsigned long uncached;
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unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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struct page *page = NULL;
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@ -144,15 +145,27 @@ static void *xtensa_dma_alloc(struct device *dev, size_t size,
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if (!page)
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return NULL;
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*handle = phys_to_dma(dev, page_to_phys(page));
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#ifdef CONFIG_MMU
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if (PageHighMem(page)) {
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void *p;
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p = dma_common_contiguous_remap(page, size, VM_MAP,
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pgprot_noncached(PAGE_KERNEL),
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__builtin_return_address(0));
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if (!p) {
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if (!dma_release_from_contiguous(dev, page, count))
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__free_pages(page, get_order(size));
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}
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return p;
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}
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#endif
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ret = (unsigned long)page_address(page);
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/* We currently don't support coherent memory outside KSEG */
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BUG_ON(ret < XCHAL_KSEG_CACHED_VADDR ||
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ret > XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE - 1);
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uncached = ret + XCHAL_KSEG_BYPASS_VADDR - XCHAL_KSEG_CACHED_VADDR;
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*handle = virt_to_bus((void *)ret);
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__invalidate_dcache_range(ret, size);
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return (void *)uncached;
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@ -161,13 +174,20 @@ static void *xtensa_dma_alloc(struct device *dev, size_t size,
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static void xtensa_dma_free(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle, unsigned long attrs)
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{
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unsigned long addr = (unsigned long)vaddr +
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XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
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struct page *page = virt_to_page(addr);
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unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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unsigned long addr = (unsigned long)vaddr;
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struct page *page;
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BUG_ON(addr < XCHAL_KSEG_CACHED_VADDR ||
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addr > XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE - 1);
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if (addr >= XCHAL_KSEG_BYPASS_VADDR &&
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addr - XCHAL_KSEG_BYPASS_VADDR < XCHAL_KSEG_SIZE) {
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addr += XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
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page = virt_to_page(addr);
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} else {
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#ifdef CONFIG_MMU
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dma_common_free_remap(vaddr, size, VM_MAP);
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#endif
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page = pfn_to_page(PHYS_PFN(dma_to_phys(dev, dma_handle)));
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}
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if (!dma_release_from_contiguous(dev, page, count))
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__free_pages(page, get_order(size));
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