[PATCH 09/15] swiotlb: use dma_capable()

This converts swiotlb to use dma_capable() instead of
swiotlb_arch_address_needs_mapping() and is_buffer_dma_capable().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...>
---
 lib/swiotlb.c |   24 +++++-------------------
 1 files changed, 5 insertions(+), 19 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 1a89c84..a0faeb0 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -130,12 +130,6 @@ static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
  return swiotlb_phys_to_bus(hwdev, virt_to_phys(address));
 }
 
-int __weak swiotlb_arch_address_needs_mapping(struct device *hwdev,
-       dma_addr_t addr, size_t size)
-{
- return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);
-}
-
 static void swiotlb_print_info(unsigned long bytes)
 {
  phys_addr_t pstart, pend;
@@ -296,12 +290,6 @@ cleanup1:
  return -ENOMEM;
 }
 
-static inline int
-address_needs_mapping(struct device *hwdev, dma_addr_t addr, size_t size)
-{
- return swiotlb_arch_address_needs_mapping(hwdev, addr, size);
-}
-
 static int is_swiotlb_buffer(phys_addr_t paddr)
 {
  return paddr >= virt_to_phys(io_tlb_start) &&
@@ -538,9 +526,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  dma_mask = hwdev->coherent_dma_mask;
 
  ret = (void *)__get_free_pages(flags, order);
- if (ret &&
-    !is_buffer_dma_capable(dma_mask, swiotlb_virt_to_bus(hwdev, ret),
-   size)) {
+ if (ret && swiotlb_virt_to_bus(hwdev, ret) + size > dma_mask) {
  /*
  * The allocated memory isn't reachable by the device.
  */
@@ -562,7 +548,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  dev_addr = swiotlb_virt_to_bus(hwdev, ret);
 
  /* Confirm address can be DMA'd by device */
- if (!is_buffer_dma_capable(dma_mask, dev_addr, size)) {
+ if (dev_addr + size > dma_mask) {
  printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
        (unsigned long long)dma_mask,
        (unsigned long long)dev_addr);
@@ -634,7 +620,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  * we can safely return the device addr and not worry about bounce
  * buffering it.
  */
- if (!address_needs_mapping(dev, dev_addr, size) && !swiotlb_force)
+ if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
  return dev_addr;
 
  /*
@@ -651,7 +637,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  /*
  * Ensure that the address returned is DMA'ble
  */
- if (address_needs_mapping(dev, dev_addr, size))
+ if (!dma_capable(dev, dev_addr, size))
  panic("map_single: bounce buffer is not DMA'ble");
 
  return dev_addr;
@@ -798,7 +784,7 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr);
 
  if (swiotlb_force ||
-    address_needs_mapping(hwdev, dev_addr, sg->length)) {
+    !dma_capable(hwdev, dev_addr, sg->length)) {
  void *map = map_single(hwdev, sg_phys(sg),
        sg->length, dir);
  if (!map) {
--
1.6.0.6

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