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Commit 640aebfe authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Ingo Molnar
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swiotlb: add is_swiotlb_buffer helper function 



This adds is_swiotlb_buffer() helper function to see whether a buffer
belongs to the swiotlb buffer or not.

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 21f6c4de

lib/swiotlb.c

+9 −5
Original line number Diff line number Diff line
@@ -283,6 +283,11 @@ address_needs_mapping(struct device *hwdev, dma_addr_t addr) 
	return (addr & ~mask) != 0;

}



static int is_swiotlb_buffer(char *addr)

{

	return addr >= io_tlb_start && addr < io_tlb_end;

}



/*

 * Allocates bounce buffer and returns its kernel virtual address.

 */
@@ -508,8 +513,7 @@ swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, 
		      dma_addr_t dma_handle)

{

	WARN_ON(irqs_disabled());

	if (!(vaddr >= (void *)io_tlb_start

                    && vaddr < (void *)io_tlb_end))

	if (!is_swiotlb_buffer(vaddr))

		free_pages((unsigned long) vaddr, get_order(size));

	else

		/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
@@ -602,7 +606,7 @@ swiotlb_unmap_single_attrs(struct device *hwdev, dma_addr_t dev_addr, 
	char *dma_addr = bus_to_virt(dev_addr);



	BUG_ON(dir == DMA_NONE);

	if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)

	if (is_swiotlb_buffer(dma_addr))

		unmap_single(hwdev, dma_addr, size, dir);

	else if (dir == DMA_FROM_DEVICE)

		dma_mark_clean(dma_addr, size);
@@ -632,7 +636,7 @@ swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, 
	char *dma_addr = bus_to_virt(dev_addr);



	BUG_ON(dir == DMA_NONE);

	if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)

	if (is_swiotlb_buffer(dma_addr))

		sync_single(hwdev, dma_addr, size, dir, target);

	else if (dir == DMA_FROM_DEVICE)

		dma_mark_clean(dma_addr, size);
@@ -663,7 +667,7 @@ swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr, 
	char *dma_addr = bus_to_virt(dev_addr) + offset;



	BUG_ON(dir == DMA_NONE);

	if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)

	if (is_swiotlb_buffer(dma_addr))

		sync_single(hwdev, dma_addr, size, dir, target);

	else if (dir == DMA_FROM_DEVICE)

		dma_mark_clean(dma_addr, size);