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Feature:

Browse source 
- Use dma addresses instead of the virt_to_phys and vice versa functions.
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Merge tag 'stable/for-linus-3.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Pull swiotlb update from Konrad Rzeszutek Wilk:
 "Feature:
   - Use dma addresses instead of the virt_to_phys and vice versa
     functions.

  Remove the multitude of phys_to_virt/virt_to_phys calls and instead
  operate on the physical addresses instead of virtual in many of the
  internal functions.  This does provide a speed up in interrupt
  handlers that do DMA operations and use SWIOTLB."

* tag 'stable/for-linus-3.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: Do not export swiotlb_bounce since there are no external consumers
  swiotlb: Use physical addresses instead of virtual in swiotlb_tbl_sync_single
  swiotlb: Use physical addresses for swiotlb_tbl_unmap_single
  swiotlb: Return physical addresses when calling swiotlb_tbl_map_single
  swiotlb: Make io_tlb_overflow_buffer a physical address
  swiotlb: Make io_tlb_start a physical address instead of a virtual one
  swiotlb: Make io_tlb_end a physical address instead of a virtual one
This commit is contained in:
Linus Torvalds 2012-12-16 17:39:14 -08:00
commit 9b690c3d56
3 changed files with 163 additions and 151 deletions
Download patch file Download diff file Expand all files Collapse all files

25
drivers/xen/swiotlb-xen.c
View file

@ -338,9 +338,8 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
phys_addr_t phys = page_to_phys(page) + offset;
phys_addr_t map, phys = page_to_phys(page) + offset;
dma_addr_t dev_addr = xen_phys_to_bus(phys);
void *map;
BUG_ON(dir == DMA_NONE);
/*
@ -356,10 +355,10 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
* Oh well, have to allocate and map a bounce buffer.
*/
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir);
if (!map)
if (map == SWIOTLB_MAP_ERROR)
return DMA_ERROR_CODE;
dev_addr = xen_virt_to_bus(map);
dev_addr = xen_phys_to_bus(map);
/*
* Ensure that the address returned is DMA'ble
@ -389,7 +388,7 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr)) {
swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
return;
}
@ -434,8 +433,7 @@ xen_swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
/* NOTE: We use dev_addr here, not paddr! */
if (is_xen_swiotlb_buffer(dev_addr)) {
swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir,
target);
swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
return;
}
@ -494,11 +492,12 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
if (swiotlb_force ||
!dma_capable(hwdev, dev_addr, sg->length) ||
range_straddles_page_boundary(paddr, sg->length)) {
void *map = swiotlb_tbl_map_single(hwdev,
start_dma_addr,
sg_phys(sg),
sg->length, dir);
if (!map) {
phys_addr_t map = swiotlb_tbl_map_single(hwdev,
start_dma_addr,
sg_phys(sg),
sg->length,
dir);
if (map == SWIOTLB_MAP_ERROR) {
/* Don't panic here, we expect map_sg users
to do proper error handling. */
xen_swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
@ -506,7 +505,7 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
sgl[0].dma_length = 0;
return DMA_ERROR_CODE;
}
sg->dma_address = xen_virt_to_bus(map);
sg->dma_address = xen_phys_to_bus(map);
} else
sg->dma_address = dev_addr;
sg->dma_length = sg->length;