[Xen-devel] [PATCH 08 of 14] swiotlb: factor out copy to/from device

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 lib/swiotlb.c |   17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -312,6 +312,15 @@
        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 @@
        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 @@
                 * 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 @@
        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;



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