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-rw-r--r--lib/swiotlb.c35
1 files changed, 16 insertions, 19 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 16a548dc91ac..196b06984dec 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -355,14 +355,15 @@ static int is_swiotlb_buffer(phys_addr_t paddr)
/*
* Bounce: copy the swiotlb buffer back to the original dma location
*/
-void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
- enum dma_data_direction dir)
+static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir)
{
- unsigned long pfn = PFN_DOWN(phys);
+ unsigned long pfn = PFN_DOWN(orig_addr);
+ unsigned char *vaddr = phys_to_virt(tlb_addr);
if (PageHighMem(pfn_to_page(pfn))) {
/* The buffer does not have a mapping. Map it in and copy */
- unsigned int offset = phys & ~PAGE_MASK;
+ unsigned int offset = orig_addr & ~PAGE_MASK;
char *buffer;
unsigned int sz = 0;
unsigned long flags;
@@ -373,25 +374,23 @@ void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
local_irq_save(flags);
buffer = kmap_atomic(pfn_to_page(pfn));
if (dir == DMA_TO_DEVICE)
- memcpy(dma_addr, buffer + offset, sz);
+ memcpy(vaddr, buffer + offset, sz);
else
- memcpy(buffer + offset, dma_addr, sz);
+ memcpy(buffer + offset, vaddr, sz);
kunmap_atomic(buffer);
local_irq_restore(flags);
size -= sz;
pfn++;
- dma_addr += sz;
+ vaddr += sz;
offset = 0;
}
+ } else if (dir == DMA_TO_DEVICE) {
+ memcpy(vaddr, phys_to_virt(orig_addr), size);
} else {
- if (dir == DMA_TO_DEVICE)
- memcpy(dma_addr, phys_to_virt(phys), size);
- else
- memcpy(phys_to_virt(phys), dma_addr, size);
+ memcpy(phys_to_virt(orig_addr), vaddr, size);
}
}
-EXPORT_SYMBOL_GPL(swiotlb_bounce);
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
dma_addr_t tbl_dma_addr,
@@ -493,8 +492,7 @@ found:
for (i = 0; i < nslots; i++)
io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
- swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr), size,
- DMA_TO_DEVICE);
+ swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE);
return tlb_addr;
}
@@ -526,9 +524,8 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
/*
* First, sync the memory before unmapping the entry
*/
- if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
- swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr),
- size, DMA_FROM_DEVICE);
+ if (orig_addr && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
+ swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE);
/*
* Return the buffer to the free list by setting the corresponding
@@ -569,14 +566,14 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
switch (target) {
case SYNC_FOR_CPU:
if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr),
+ swiotlb_bounce(orig_addr, tlb_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))
- swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr),
+ swiotlb_bounce(orig_addr, tlb_addr,
size, DMA_TO_DEVICE);
else
BUG_ON(dir != DMA_FROM_DEVICE);