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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-09-08 18:53:50 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-08 15:53:31 +0200 |
| commit | 640aebfe014554ced9c38d2564e38862e488d0eb (patch) | |
| tree | 64ce0e7ae61fd7707d2ea8f1c68661c92769197a | |
| parent | 21f6c4de4c25c4bdd88c75bc97a78e7fbeebac4d (diff) | |
| download | linux-640aebfe014554ced9c38d2564e38862e488d0eb.tar.gz linux-640aebfe014554ced9c38d2564e38862e488d0eb.tar.bz2 linux-640aebfe014554ced9c38d2564e38862e488d0eb.zip | |
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: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | lib/swiotlb.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c index bf61c73a3418..b5f5d1133042 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -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); |