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-rw-r--r--lib/swiotlb.c62
1 files changed, 40 insertions, 22 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 566791b..a1a6d6b 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -58,6 +58,14 @@
*/
#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
+/*
+ * Enumeration for sync targets
+ */
+enum dma_sync_target {
+ SYNC_FOR_CPU = 0,
+ SYNC_FOR_DEVICE = 1,
+};
+
int swiotlb_force;
/*
@@ -397,21 +405,28 @@ unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
}
static void
-sync_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
+sync_single(struct device *hwdev, char *dma_addr, size_t size,
+ int dir, int target)
{
int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
char *buffer = io_tlb_orig_addr[index];
- /*
- * bounce... copy the data back into/from the original buffer
- * XXX How do you handle DMA_BIDIRECTIONAL here ?
- */
- if (dir == DMA_FROM_DEVICE)
- memcpy(buffer, dma_addr, size);
- else if (dir == DMA_TO_DEVICE)
- memcpy(dma_addr, buffer, size);
- else
+ switch (target) {
+ case SYNC_FOR_CPU:
+ if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
+ memcpy(buffer, dma_addr, size);
+ else if (dir != DMA_TO_DEVICE)
+ BUG();
+ break;
+ case SYNC_FOR_DEVICE:
+ if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
+ memcpy(dma_addr, buffer, size);
+ else if (dir != DMA_FROM_DEVICE)
+ BUG();
+ break;
+ default:
BUG();
+ }
}
void *
@@ -596,14 +611,14 @@ swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size,
*/
static inline void
swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, int dir)
+ size_t size, int dir, int target)
{
char *dma_addr = phys_to_virt(dev_addr);
if (dir == DMA_NONE)
BUG();
if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
- sync_single(hwdev, dma_addr, size, dir);
+ sync_single(hwdev, dma_addr, size, dir, target);
else if (dir == DMA_FROM_DEVICE)
mark_clean(dma_addr, size);
}
@@ -612,14 +627,14 @@ void
swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
size_t size, int dir)
{
- swiotlb_sync_single(hwdev, dev_addr, size, dir);
+ swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
}
void
swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
size_t size, int dir)
{
- swiotlb_sync_single(hwdev, dev_addr, size, dir);
+ swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
}
/*
@@ -627,14 +642,15 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
*/
static inline void
swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
- unsigned long offset, size_t size, int dir)
+ unsigned long offset, size_t size,
+ int dir, int target)
{
char *dma_addr = phys_to_virt(dev_addr) + offset;
if (dir == DMA_NONE)
BUG();
if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
- sync_single(hwdev, dma_addr, size, dir);
+ sync_single(hwdev, dma_addr, size, dir, target);
else if (dir == DMA_FROM_DEVICE)
mark_clean(dma_addr, size);
}
@@ -643,14 +659,16 @@ void
swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
unsigned long offset, size_t size, int dir)
{
- swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir);
+ swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+ SYNC_FOR_CPU);
}
void
swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
unsigned long offset, size_t size, int dir)
{
- swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir);
+ swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
+ SYNC_FOR_DEVICE);
}
/*
@@ -729,7 +747,7 @@ swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
*/
static inline void
swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sg,
- int nelems, int dir)
+ int nelems, int dir, int target)
{
int i;
@@ -739,21 +757,21 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sg,
for (i = 0; i < nelems; i++, sg++)
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
sync_single(hwdev, (void *) sg->dma_address,
- sg->dma_length, dir);
+ sg->dma_length, dir, target);
}
void
swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
int nelems, int dir)
{
- swiotlb_sync_sg(hwdev, sg, nelems, dir);
+ swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
}
void
swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
int nelems, int dir)
{
- swiotlb_sync_sg(hwdev, sg, nelems, dir);
+ swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
}
int
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