swiotlb: Add support for DMA_ATTR_SKIP_CPU_SYNC
As a first step to making DMA_ATTR_SKIP_CPU_SYNC apply to architectures
beyond just ARM I need to make it so that the swiotlb will respect the
flag. In order to do that I also need to update the swiotlb-xen since it
heavily makes use of the functionality.
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index b8014bf..3d048af 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -405,7 +405,8 @@
*/
trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
- map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir);
+ map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir,
+ attrs);
if (map == SWIOTLB_MAP_ERROR)
return DMA_ERROR_CODE;
@@ -419,7 +420,8 @@
if (dma_capable(dev, dev_addr, size))
return dev_addr;
- swiotlb_tbl_unmap_single(dev, map, size, dir);
+ swiotlb_tbl_unmap_single(dev, map, size, dir,
+ attrs | DMA_ATTR_SKIP_CPU_SYNC);
return DMA_ERROR_CODE;
}
@@ -445,7 +447,7 @@
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr)) {
- swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
+ swiotlb_tbl_unmap_single(hwdev, paddr, size, dir, attrs);
return;
}
@@ -558,11 +560,12 @@
start_dma_addr,
sg_phys(sg),
sg->length,
- dir);
+ dir, attrs);
if (map == SWIOTLB_MAP_ERROR) {
dev_warn(hwdev, "swiotlb buffer is full\n");
/* Don't panic here, we expect map_sg users
to do proper error handling. */
+ attrs |= DMA_ATTR_SKIP_CPU_SYNC;
xen_swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
attrs);
sg_dma_len(sgl) = 0;