From 1b548f667c1487d92e794a9f7a67788f49b952d8 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 16 Dec 2008 12:17:32 -0800 Subject: swiotlb: factor out copy to/from device Impact: generalize IO bounce memcpys Signed-off-by: Ian Campbell Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar --- lib/swiotlb.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'lib/swiotlb.c') diff --git a/lib/swiotlb.c b/lib/swiotlb.c index d8b09051c45..a0b4039e288 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -312,6 +312,15 @@ static int is_swiotlb_buffer(char *addr) return addr >= io_tlb_start && addr < io_tlb_end; } +static void +__sync_single(char *buffer, char *dma_addr, size_t size, int dir) +{ + if (dir == DMA_TO_DEVICE) + memcpy(dma_addr, buffer, size); + else + memcpy(buffer, dma_addr, size); +} + /* * Allocates bounce buffer and returns its kernel virtual address. */ @@ -413,7 +422,7 @@ found: for (i = 0; i < nslots; i++) io_tlb_orig_addr[index+i] = buffer + (i << IO_TLB_SHIFT); if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) - memcpy(dma_addr, buffer, size); + __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE); return dma_addr; } @@ -437,7 +446,7 @@ unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) * bounce... copy the data back into the original buffer * and * delete the bounce buffer. */ - memcpy(buffer, dma_addr, size); + __sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE); /* * Return the buffer to the free list by setting the corresponding @@ -477,13 +486,13 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size, switch (target) { case SYNC_FOR_CPU: if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) - memcpy(buffer, dma_addr, size); + __sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE); else BUG_ON(dir != DMA_TO_DEVICE); break; case SYNC_FOR_DEVICE: if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) - memcpy(dma_addr, buffer, size); + __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE); else BUG_ON(dir != DMA_FROM_DEVICE); break; -- cgit v1.2.3-70-g09d2