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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-09-08 18:53:50 +0900
committerIngo Molnar <mingo@elte.hu>2008-09-08 15:53:31 +0200
commit640aebfe014554ced9c38d2564e38862e488d0eb (patch)
tree64ce0e7ae61fd7707d2ea8f1c68661c92769197a
parent21f6c4de4c25c4bdd88c75bc97a78e7fbeebac4d (diff)
downloadop-kernel-dev-640aebfe014554ced9c38d2564e38862e488d0eb.zip
op-kernel-dev-640aebfe014554ced9c38d2564e38862e488d0eb.tar.gz
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.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index bf61c73..b5f5d11 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);
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