swiotlb: Use physical addresses instead of virtual in swiotlb_tbl_sync_single
This change makes it so that the sync functionality also uses physical
addresses. This helps to further reduce the use of virt_to_phys and
phys_to_virt functions.
In order to clarify things since we now have 2 physical addresses in use
inside of swiotlb_tbl_sync_single I am renaming phys to orig_addr, and
dma_addr to tlb_addr. This way is should be clear that orig_addr is
contained within io_orig_addr and tlb_addr is an address within the
io_tlb_addr buffer.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index d7701dc..16a548d 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -557,26 +557,27 @@
}
EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single);
-void
-swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size,
- enum dma_data_direction dir,
- enum dma_sync_target target)
+void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir,
+ enum dma_sync_target target)
{
- int index = (dma_addr - (char *)phys_to_virt(io_tlb_start)) >> IO_TLB_SHIFT;
- phys_addr_t phys = io_tlb_orig_addr[index];
+ int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
+ phys_addr_t orig_addr = io_tlb_orig_addr[index];
- phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1));
+ orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
switch (target) {
case SYNC_FOR_CPU:
if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE);
+ swiotlb_bounce(orig_addr, phys_to_virt(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(phys, dma_addr, size, DMA_TO_DEVICE);
+ swiotlb_bounce(orig_addr, phys_to_virt(tlb_addr),
+ size, DMA_TO_DEVICE);
else
BUG_ON(dir != DMA_FROM_DEVICE);
break;
@@ -785,8 +786,7 @@
BUG_ON(dir == DMA_NONE);
if (is_swiotlb_buffer(paddr)) {
- swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir,
- target);
+ swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
return;
}